Class / Patent application number | Description | Number of patent applications / Date published |
315201000 |
Plural load device systems
| 202 |
315206000 |
Discharge device and/or rectifier in the primary circuit of the supply transformer
| 54 |
315205000 |
Plural discharge devices and/or rectifiers in the supply circuit
| 40 |
315207000 |
Discharge device and/or rectifier in shunt to the load device
| 8 |
315200000 |
Flashers | 5 |
20090001899 | Fluorescent Lamp With Built-In Anion Generator - The invention is a a fluorescent lamp with built-in anion generator. The invention includes a bulb | 01-01-2009 |
20090021175 | SUPPLY CIRCUIT AND DEVICE COMPRISING A SUPPLY CIRCUIT - Supply circuits ( | 01-22-2009 |
20090189534 | LED Lamp And Driving Apparatus For The Same - An LED lamp including at least one LED is electrically connected to a utility input voltage. A driving apparatus located inside a lamp holder of the LED lamp includes an input rectifying/filtering unit to accept the utility input voltage; an isolated power inverter electrically connected to the input rectifying/filtering unit to generate an a buck A.C.; an output rectifying/filtering unit electrically connected to the isolated power inverter to generate an output D.C. voltage to drive the at least one LED. The components of the driving apparatus could be located inside the LED lamp, and the components can provide an isolation protection against the utility input voltage. The driving apparatus can more precisely control output D.C. voltage, current, and power as output D.C. voltage and current signals sent from the output rectifying/filtering unit are feedbacked to a photo coupler signal feedback unit. | 07-30-2009 |
20090218953 | DIMMABLE INSTANT START BALLAST - In an instant start ballast, dimming control is provided over a range of operation in which lamps driven by the ballast do not require external cathode heating. An interface circuit ( | 09-03-2009 |
20090251059 | DIMMER TRIGGERING CIRCUIT, DIMMER SYSTEM AND DIMMABLE DEVICE - The invention relates to a dimmer triggering circuit ( | 10-08-2009 |
20090256486 | Light Dimming Device for Compact Fluorescent Lamp - A light dimming device for compact fluorescent lamp includes a rectifying circuit for rectifying an AC current signal into a zero crossing voltage signal and outputting it to a current limiting circuit; the current limiting circuit for limiting the zero crossing voltage signal and sending the current limited zero crossing voltage signal to a voltage regulating and filtering circuit and a first comparator; the voltage regulating and filtering circuit for regulating the current limited signal and sending the regulated current limited signal to a reference voltage generating circuit and a current controller; a reference voltage generating circuit for generating a reference voltage signal upon receiving the regulated current limited signal and sending the reference voltage signal respectively to the first comparator and a second comparator; a current controller for controlling the amount of a charging current of a capacitor; the first comparator for outputting a low voltage level signal to the capacitor after receiving the zero crossing voltage signal and the reference voltage signal to discharge the capacitor; the second comparator for outputting a drive signal to the drive circuit after receiving the discharging signal to turn on a power switch; the filter circuit for converting the discharging signal of the capacitor into a steady DC current signal and transferring the DC current signal to the compact fluorescent lamp so as to let the compact fluorescent lamp generate light of different luminance according to the amount of the DC current signal. | 10-15-2009 |
20090302772 | FLUORESCENT LAMP DIMMING CIRCUIT - In one embodiment, a fluorescent lamp dimming circuit includes power factor correction control, dimming control, and switching devices. The power factor correction control may be connected to power factor correction circuitry that produces a regulated DC buss. The dimming control circuit may be connected to the input of the fluorescent lamp dimming circuit for producing a driver signal whose frequency varies depending on the input voltage waveform perhaps as modified by a dimmer. The control circuit may produce a drive signal with a duty cycle profile to drive switching devices. The switching devices invert the DC buss voltage to an AC voltage waveform for driving a resonant tank circuit. The resonant tank circuit may include an inductance, a capacitance, and the impedance of a fluorescent lamp. The AC voltage waveform when applied to the resonant tank circuit may cause the fluorescent lamp to dim based on the dimmer setting. | 12-10-2009 |
20100090608 | END-OF-LAMP LIFE DETECTION CIRCUIT - An end of life (EOL) detection circuit for a gas discharge lamp. The circuit includes a comparator for comparing an input voltage to first and second threshold voltages and providing an EOL signal; a sensing circuit for sensing a DC offset in the lamp-voltage during the EOL of the lamp; and a reference voltage setting circuit responsive to the DC offset including a reference diode for setting an adjustable reference voltage as said input voltage to the comparator. | 04-15-2010 |
20100117546 | LED LIGHT-EMITTING DEVICE - The present invention relates to a LED light-emitting device comprising a substrate, at least one LED bulb and a rectifier assembly. The substrate comprises a flexible substrate. The flexible substrate comprises at least one pair of conductors. The conductors can be arranged straight or curved. The at least one LED bulb detachably connects to the conductors. The rectifier assembly comprises an electromagnetic interference (EMI) filter, a rectifier and a pulse width modulation (PWM) controller that stabilizes current flowing through the LED light-emitting device. | 05-13-2010 |
20110080102 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 04-07-2011 |
20110266965 | CONTROL CIRCUIT OF LIGHT-EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit ( | 11-03-2011 |
20110285301 | TRIAC DIMMER COMPATIBLE SWITCHING MODE POWER SUPPLY AND METHOD THEREOF - Triac dimmer compatible switching mode power supplies used as LED drivers are disclosed herein. A PFC controller is configured in the switching mode power supplies. With the PFC controller, the current keeping the triac in the on-state is supplied by the DC/DC converter, and the LC resonance is reduced. | 11-24-2011 |
20110316434 | ELECTRO MAGNETIC BALLAST FOR A GAS DISCHARGE LAMP - An electro magnetic ballast ( | 12-29-2011 |
20120007515 | CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AT LEAST ONE DISCHARGE LAMP - Various embodiments relate to a circuit arrangement for operating at least one discharge lamp. In order to prevent intrinsic flicker at low dimming settings and low temperatures, according to various embodiments, a direct current which is fed into the discharge lamp so as to avoid striated discharges at relatively high dimming settings is reduced or entirely eliminated. | 01-12-2012 |
20120019157 | POWER SUPPLY APPARATUS FOR LIGHT EMITTING DIODE - A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding, a secondary winding receiving a power induced from the primary winding, and a tertiary winding receiving the power induced from the primary winding. The first output unit is connected to the secondary winding of the transformer, and outputs a first power current to an LED in a first operating condition. The second output unit is connected to the tertiary winding of the transformer, and outputs a second power current to the LED in a second operating condition. When the LED is connected to the power supply apparatus for LED, the power supply apparatus allows a current equal to or less than a predetermined current to flow in the LED, thereby protecting the LED from an overcurrent. | 01-26-2012 |
20120043898 | ELECTRONIC BALLAST AND METHOD FOR OPERATION OF AT LEAST ONE DISCHARGE LAMP - Various embodiments provide an electronic ballast for operation of at least one discharge lamp, with the electronic ballast having an apparatus for power factor correction with a voltage converter. The voltage converter itself includes an inductance, a diode and a switch. A control apparatus, which produces a square-wave signal as a control signal to the switch of the apparatus for power factor correction, includes an I regulator. This produces a first component of the on time of the control signal. In order to react to short-term power demands in the load circuit for example on ignition of the discharge lamp, an electronic ballast furthermore may include a power determining apparatus, which is coupled to the control apparatus, with the control apparatus being designed to vary the control signal as a function of the power consumed in the discharge lamp. | 02-23-2012 |
20120043899 | Electronic Dimming Ballast Having Advanced Boost Converter Control - An electronic ballast for driving a gas discharge lamp includes a power converter for generating a DC bus voltage, where the bus voltage is controlled to different magnitudes during different operating modes of the ballast. The ballast comprises a control circuit that is coupled to the power converter for adjusting the magnitude of the bus voltage to a first magnitude when the lamp is off, to a second magnitude when preheating filaments of the lamp, and to a third magnitude when the lamp is on. The control circuit is also operable to preemptively adjust the magnitude of the bus voltage prior to changing modes of operation. For example, when turning the load on, the control circuit first adjusts a power-conversion-drive level of the power converter to begin adjusting the magnitude of the bus voltage towards a predetermined magnitude, and then waits for a predetermined time period before attempting to turn the load on. | 02-23-2012 |
20120056548 | CIRCUIT AND METHOD FOR DRIVING LED LAMP WITH A DIMMER - A system for driving an LED (light-emitting diode) lamp includes a dimmer circuit coupled to a line input voltage for varying a magnitude of an input voltage and a transformer having a primary winding, a secondary winding, and one or more auxiliary windings, the primary winding coupled to the dimmer circuit. The system also includes an output rectifying circuit coupled to the secondary winding for providing an output current to the LED lamp and a power switch coupled to the primary winding for controlling a current flow in the primary winding. The system further includes a controller having a comparator and a capacitor for providing a control signal to control the power switch for regulating the output current. The controller coupled to the dimmer circuit for receiving an average input voltage signal from the dimmer circuit, wherein the control signal is characterized by a duty cycle that is determined by a ratio of a charging current to a discharging current of the capacitor, and the ratio is related to the average input voltage signal from the dimmer circuit. | 03-08-2012 |
20120081018 | Digitally controlled current regulator for high power solid state lighting - An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (I | 04-05-2012 |
20120086350 | FULL-BRIDGE ELECTRONIC BALLAST HAVING SIMPLIFIED CONTINUOUS-CONDUCTION-MODE CHARGE PUMP PFC CIRCUIT - The configurations of an electronic ballast are provided in the present invention. The proposed electronic ballast includes a filter circuit having a first and a second output terminals, a rectifier circuit having a first input terminal, a second input terminal coupled to the second output terminal of the filter circuit, and a first output terminal, and a continuous-conduction-mode charge pump PFC circuit including a first inductor having a first terminal coupled to the first input terminal and a second terminal coupled to the first output terminal of the filter circuit, a second inductor having a first terminal and a first capacitor having a first terminal coupled to the first terminal of the first inductor and a second terminal coupled to the first terminal of the second inductor. | 04-12-2012 |
20120091907 | LIGHTING CIRCUIT FOR LIGHTING LED, LAMP AND LIGHTING DEVICE - A lighting circuit that receives power from an alternating-current power supply | 04-19-2012 |
20120098447 | METHOD FOR ADJUSTING LIGHT BRIGHTNESS USING A TOGGLE SWITCH AND RELATED ILLUMINANT SYSTEM - A method for adjusting the brightness of a light source is performed according to the status of input voltage which is determined by detecting how and how many times a toggle switch switches state. When a user switches the state of the toggle switch for the first time in order to turn on/off the light, the brightness of the light source gradually increases/decreases within a dimmer period, during which the user may select an appropriate brightness of the light source by giving a swift double-toggle on the toggle switch. | 04-26-2012 |
20120104955 | LED WITH INTEGRATED CONSTANT CURRENT DRIVER - An LED package containing integrated circuitry for matching a power source voltage to the LED operating voltage, LEDs containing such integrated circuitry, systems containing such packages, and methods for matching the source and operating voltages are described. The integrated circuitry typically contains a power converter and a constant current circuit. The LED package may also contain other active or passive components such as pin-outs for integrated or external components, a transformer and rectifier, or a rectifier circuit. External components can include control systems for regulating the LED current level or the properties of light emitted by the LED. Integrating the power supply and current control components into the LED can provide for fabrication of relatively small LEDs using fewer and less device-specific components. | 05-03-2012 |
20120112650 | DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES - A controller for controlling dimming of a light-emitting diode (LED) light source includes a switch monitoring pin, a current monitoring pin, and a control pin. The switch monitoring pin monitors an operation of a power switch which transfers an AC voltage to a rectifier when the power switch is on. The current monitoring pin receives a current monitoring signal indicating a current flowing through the LED light source. The control pin generates a control signal to control a second switch coupled in series with the LED light source to adjust the brightness of the LED light source according to the operation of the power switch. | 05-10-2012 |
20120133293 | STEPDOWN DC-DC CONVERTER FOR LIGHT EMITTING DIODE, AND POWER SUPPLY DEVICE AND METHOD USING THE SAME - A stepdown DC-DC converter is adapted to provide a power supply voltage necessary to control the operation of an LED. The stepdown DC-DC converter includes: a reference voltage supplier for providing a reference voltage; a feedback unit for feeding back the power supply voltage on an output line; an operational amplifier for operationally amplifying the reference voltage and the fed-back power supply voltage; a switch unit for switching on/off a DC voltage on an input line toward the output line; and a charging and discharging circuit for selectively performing a charging operation of the switched voltage from the switch unit and a discharging operation of its charged voltage according to the switching operation of the switch unit to provide the power supply voltage to the output line. | 05-31-2012 |
20120139431 | VARIABLE LOAD CIRCUITS FOR USE WITH LIGHTING CONTROL DEVICES - A variable load circuit ( | 06-07-2012 |
20120146525 | APPARATUS AND METHODS OF OPERATION OF PASSIVE AND ACTIVE LED LIGHTING EQUIPMENT - This invention is concerned with the control and design of a passive or an active LED lighting system that does not need electrolytic capacitors in the entire system and can generate light output with reduced luminous flux fluctuation. The proposal is particularly suitable, but not restricted to, off-line applications in which the lighting system is powered by the ac mains. By eliminating electrolytic capacitors which have a limited lifetime of typically 15,000 hours, the proposed system can be developed with robust electrical components such as inductor and diode circuits, and it features long lifetime, low maintenance cost, robustness against extreme temperature variations and good power factor. The proposed circuits can become dimmable systems if the AC input voltage can be adjusted by external means. | 06-14-2012 |
20120146526 | Electronic Ballast with High Power Factor - This invention provides an integrated power supply for a controller of an electronic ballast for a fluorescent lamp. The integrated power supply couples output power from the electronic ballast and uses the coupled power to provide power to the controller. In one embodiment, the electronic ballast may include a rectifier for converting an alternating current input voltage into a direct current output voltage, and a circuit including a combined power factor correction (PFC) stage and an inverter, wherein the PFC stage and the inverter share a switch. Also provided is a controller for an electronic ballast. The controller may include a voltage mode or current mode duty ratio controller that controls a duty ratio of a switch of the ballast. The controller and the ballast allow dimming of the fluorescent lamp while maintaining a high power factor. | 06-14-2012 |
20120153854 | LIGHTING CIRCUIT, LAMP, AND ILLUMINATION APPARATUS - A lighting circuit that is for a lamp including an LED as a light source and that includes a resonant circuit that can be designed with ease. A lighting circuit | 06-21-2012 |
20120153855 | CIRCUIT OF LED DRIVING POWER, DRIVING POWER AND LIGHTING DEVICE - The present invention is adapted for the field of power supply and provides a circuit of LED driving power, LED driving power and LED lighting device, the circuit of LED driving power comprises a over-voltage protection unit, a AC input filter unit, a full-wave rectifier unit and a single-stage power conversion unit, where the single-stage power conversion unit comprises an auxiliary power supply circuit, a switching circuit and a control unit in which the auxiliary power supply circuit is used to provide auxiliary power supply for single power conversion stage, the switching circuit is used to control DC output by switching on and switching off and the control unit is used to control time point of turning on and turning off dynamically based on the information collected. The present invention can improve the overall efficiency of the LED driving power by controlling switching circuit dynamically in single-stage power conversion unit. | 06-21-2012 |
20120161654 | CONSTANT CURRENT POWER SUPPLY DEVICE - A constant current power supply device according to the present invention includes: an error amplifier to amplify an error signal of an error voltage between a voltage of a current detection resistor and a reference voltage, and a second control circuit to sample and hold the error signal in an ON period of the external signal, output the error signal to a first control circuit, hold the error signal just before the external signal is turned from ON to OFF, increase an amplification ratio of the error amplifier by a predetermined magnification ratio in an OFF period of the external signal, and output the increased error signal to the first control circuit. | 06-28-2012 |
20120161655 | BALLAST WITH ANTI-STRIATION CIRCUIT - A ballast including an inverter circuit for providing an oscillating power signal for energizing at least one lamp. The inverter circuit includes a first transistor having a first gain and a second transistor having a second gain, each configured for alternately operating between a conductive state and a non-conductive state. The power signal has a waveform cycle comprising a first pulse generated when a first transistor operates in a conductive state, and a second pulse generated when the second transistor operates in a conductive state. The integral value of the first pulse of each waveform cycle of the power signal is different from the integral value of the second pulse of each waveform cycle such that a differential relationship between the first gain and the second gain is greater than or equal to a minimum value in order to minimize lamp striations. | 06-28-2012 |
20120169243 | CIRCUITS AND METHODS FOR CONTROLLING DIMMING OF A LIGHT SOURCE - A controller that monitors a rectified voltage and detects whether the rectified voltage comes from a TRIAC dimmer or an on/off switch dimmer is disclosed. The controller controls dimming of a light source according to the rectified voltage if the rectified voltage comes from the TRIAC dimmer. The controller controls dimming of the light source according to an operation of the on/off switch dimmer if the rectified voltage comes from the on/off switch dimmer. | 07-05-2012 |
20120176054 | LIGHT DEVICE AND POWER CONTROL CIRCUIT THEREOF - A light device comprising a light emitting unit, a voltage control unit, and a current control unit is provided. The light emitting unit is capable of receiving DC power. The voltage control unit has a power input terminal, a power output terminal, and a voltage setting member, with the power input terminal connecting with the light emitting unit, the voltage setting member having a threshold value to control the voltage of the power output terminal in a value equal to or lower than the threshold value. The current control unit has a voltage regulating member and a current adjusting member, with the voltage regulating member connecting with the power output terminal of the voltage control unit and generating a stable DC voltage, and with the current adjusting member connected between the voltage regulating member and a ground point to stabilize a current passing through the current adjusting member. | 07-12-2012 |
20120176055 | APPARATUS FOR CONTROLLING BLEED SWITCH, POWER SUPPLY, AND METHOD FOR DRIVING POWER SUPPLY - A power supply has a TRIAC dimmer, and an AC-DC converter connected to the TRIAC dimmer. The AC-DC converter has a power switch, a bleed switch, and a controller. The controller turns off the bleed switch in a first time duration and turns on the bleed switch in a second time duration. Magnitude of a current of the power switch in the first time duration is larger than magnitude of a current of the power switch in the second time duration. Magnitude of a current of the bleed switch in a third time duration within the second time duration is smaller than magnitude of a current of the bleed switch in a fourth time duration within the second time duration. | 07-12-2012 |
20120176056 | Circuit Arrangement for Operation of at Least One LED - In various embodiments, a circuit for operating an LED includes input terminals for coupling to a supply voltage; output terminals for providing output DC voltage(s) to the LED(s); an inverter having a bridge circuit with at least first and second electronic switches comprising control electrodes, reference electrodes and working electrodes, wherein first and second electronic switches are serially coupled between input terminals, forming a first bridge center point; a first inductor serially coupled between first bridge center point and an output terminal; and a drive circuit having output terminals, wherein one output terminal is coupled to control electrode of first electronic switch and second output terminal is coupled to control electrode of second electronic switch; configured so that-drive circuit comprises control devices, wherein one control device includes a second inductor magnetically coupled to the first inductor, and wherein second control device includes third inductor magnetically coupled to first inductor. | 07-12-2012 |
20120181941 | LED DRIVING APPARATUS AND LED LIGHTING APPARATUS - An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q | 07-19-2012 |
20120194089 | LED POWER SUPPLY DEVICE - An LED power supply device is provided. In the invention, a digital control device and a programmable interface are used to set an output specification of the LED power supply device, such that one smart LED power supply device can be used to supply power to the LED lamps of different specifications. In this way, it is unnecessary to specifically design and test the power supply devices for the LED lamps of different specifications, so that a design and production cycle of the LED power supply devices and costs thereof are greatly reduced. On the other hand, usage of the digital control device avails monitoring and controlling a state of the LED lamp, for example, implementing temperature control, time control, color and luminance control, etc., by which a service life, efficiency and flexibility of the LED lamp are enhanced. | 08-02-2012 |
20120194090 | SWITCHING POWER CIRCUIT, AND LIGHTING DEVICE FOR SEMICONDUCTOR LIGHT-EMITTING ELEMENT AND ILLUMINATION APPARATUS USING SAME - A switching power circuit includes a first switching element having one end connected to a positive electrode of a first capacitor, a second switching element having one end connected to a negative electrode of the first capacitor, an inductive element having one end connected to the other ends of the first and the second switching element, a semiconductor switching element connected in parallel to the current limiting resistor, and a second capacitor connected to a control electrode of the semiconductor switching element. The second capacitor is charged by using a voltage induced to the inductive element when the first or the second switching element is off. | 08-02-2012 |
20120200230 | LED LIGHTING DEVICE WITH OUTPUT IMPEDANCE CONTROL - An LED lighting device is provided with output impedance control to stabilize an optical output across a wide current range. A switching power supply generates the output current, with switching control circuitry to determine switching frequency and an ON period for an associated switch, and to turn on/off the switch according to the determined frequency and ON period. An impedance element is coupled across output terminals for the lighting device, with an impedance value set so that a load current is larger than a current flowing to the impedance element at maximum on-duty of the switch and a current flowing to the impedance element is larger than the load current at minimum on-duty. The impedance element may be a variable impedance element, wherein an impedance control circuit adjusts the variable impedance such that an impedance value for minimum on-duty of the switch is smaller than that for a maximum on-duty. | 08-09-2012 |
20120206056 | CONSTANT-CURRENT-DRIVE LED MODULE DEVICE - A constant-current-drive LED module device includes a rectifier configured to receive and rectify an alternating current power source; a unidirectional LED module unit configured to connect to one end of the rectifier; and a constant current unit configured to connect between the unidirectional LED module unit and the other end of the rectifier to control constant current. | 08-16-2012 |
20120212145 | ILLUMINATION BRIGHTNESS CONTROL APPARATUS AND METHOD - An illumination brightness control apparatus receives an input voltage from a light dimmer and produces a control signal to regulate a drive signal to a power conversion switch of a switching mode power converter. The apparatus includes a voltage conditioning circuit to condition the dimmer input voltage to provide a conditioned voltage signal; an ADC circuit to sample analog data of the conditioned voltage signal at a sampling rate that is high relative to a nominal variation rate of the dimmer input voltage and to provide digital data corresponding to the sampled analog data; a digital signal processing circuit to produce a running data average of the digital data; and a controller to produce a signal corresponding to the running data average as the control signal to regulate the drive signal. | 08-23-2012 |
20120217888 | LED DRIVER CIRCUIT - The present invention is directed to an LED driver circuit. The LED driver circuit has a control module executing the power factor correction (PFC) by providing a divided voltage being directly proportional to the input voltage to the control module and calculating a feedback signal associated with the input signal. | 08-30-2012 |
20120223650 | LIGHTING DEVICE - Information technology is becoming more and more present in illumination applications, such as lighting devices. To limit the installation effort and cost of such illumination applications lighting devices compliant with the Power over Ethernet can be used. There is provided a lighting device which is powered via Power over Ethernet and where the driver of the lighting device is directly compatible with the Power over Ethernet standard. With such an internal Power over Ethernet driver, the power delivered to the light source of the lighting device can be influence gradually, thereby allowing the light source to operate at a different power level instead of shutting the light source down completely. | 09-06-2012 |
20120229040 | METHOD AND APPARATUS TO FACILITATE COUPLING AN LED-BASED LAMP TO A FLOURESCENT LIGHT FIXTURE - Some embodiments described herein provide methods and apparatuses to facilitate coupling a light-emitting diode (LED)-based lamp to an electronic or inductive fluorescent light fixture (typically with ballast). Specifically, some embodiments include circuitry that simulates an electrical behavior of a fluorescent lamp. The embodiments also include one or more LEDs that are controlled by the circuitry. | 09-13-2012 |
20120229041 | LED DRIVER FOR POWERING AN LED UNIT FROM A ELECTRONIC TRANSFORMER - An LED driver comprising a power converter for powering an LED unit and a control unit for controlling the power converter is provided. The power converter comprising an input terminal for receiving a rectified AC supply voltage, and an output terminal for supplying a current to the LED unit, and the control unit comprising—an input for receiving a supply signal representative of the supply voltage and—an output for providing a control signal to the power converter The control unit is further arranged to:—determine the control signal for controlling the power converter based on the supply signal, and—control the power converter to supply the current to the LED unit based on the control signal, the current being amplitude modulated in synchronism or in phase with the rectified AC supply voltage. | 09-13-2012 |
20120235585 | METHOD AND APPARATUS SELECTIVELY DETERMINING UNIVERSAL VOLTAGE INPUT FOR SOLID STATE LIGHT FIXTURES - A device for detecting a dimmer phase angle set by operation of a dimmer for a solid state lighting load includes a processor having a digital input, a first diode connected between the digital input and a voltage source and a second diode connected between the digital input and ground. The device further includes a first capacitor connected between the digital input and a detection node, a second capacitor connected between the detection node and ground, and a resistance connected between the detection node and a rectified voltage node, which receives a rectified voltage from the dimmer. The processor is configured to sample digital pulses at the digital input based on the rectified voltage and to identify the dimmer phase angle based on lengths of the sampled digital pulses. | 09-20-2012 |
20120242237 | SCR DIMMING CIRCUIT AND METHOD - The present invention relates to a silicon-controlled rectifier (SCR) dimming circuit and method for regulating the luminance of a light-emitting diode (LED) load. In one embodiment, an SCR dimming circuit can include: an SCR rectifying circuit having an SCR element that receives an AC power supply, and generates a lack-phase AC voltage; a rectifier bridge that converts the lack-phase AC voltage to a lack-phase DC voltage, where the lack-phase DC voltage is filtered through a filter capacitor to generate a smooth DC voltage; a conduction phase angle signal generator that receives the lack-phase DC voltage and generates a controlling signal indicating a conduction phase angle range of the SCR element; and a dimming signal generator that compares the controlling signal and a slope reference signal to output a dimming signal to control the luminance of the LED load. | 09-27-2012 |
20120242238 | Light Emitting Device Power Supply Circuit, and Light Emitting Device Driver Circuit and Control Method Thereof - The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit. | 09-27-2012 |
20120248999 | SWITCHING POWER-SUPPLY DEVICE AND LUMINAIRE - According to one embodiment, a switching power-supply device includes a switching element, a constant current element, a rectifying element, first and second inductors, and a constant voltage circuit. The switching element supplies, when the switching element is on, a power-supply voltage of a direct-current power supply to and feeds an electric current to the first inductor. The constant current element is connected to the switching element in series and turns off the switching element when the electric current of the switching element exceeds a predetermined current value. The rectifying element is connected to any one of the switching element and the constant current element in series. The second inductor is magnetically coupled to the first inductor and supplies induced potential to a control terminal of the switching element. The constant voltage circuit applies control potential to a control terminal of the constant current element. | 10-04-2012 |
20120249000 | LED DIMMER CIRCUIT - A TRIAC dimmer gates an AC waveform from an AC power source in proportion to a control signal and outputs a TRIAC pulse having part of the waveform missing. The TRIAC pulse is rectified and is applied to an LED array and the drive current flowing to the LED array is detected at a current detection resistor. The drive current value and a predetermined value are compared at a comparator and in accordance with the comparison result thereof the control transistor is turned off. Then, the TRIAC pulse is converted to a DC voltage signal and in accordance with the obtained DC voltage signal the drive current value or the predetermined value input by the comparator are changed. Furthermore, instead of the TRIAC pulse, a PWM pulse supplied from an external source may also be utilized. | 10-04-2012 |
20120249001 | LIGHTING POWER SUPPLY DEVICE - A lighting power supply device includes a control circuit controlling a transistor that controls a drive current flown through a lamp, receiving a pulsating flow converted from an alternating current by a rectifying circuit rectifying the alternating current subjected to phase control by a phase-controlled dimmer, and generating/outputting direct current voltage/current supplied to the lamp. The control circuit includes a time-voltage conversion circuit converting a time decided according to a phase of a voltage corresponding to the pulsating flow into a voltage; and a terminal to which a capacitor with an arbitrary capacitance value is connectable. The time-voltage conversion circuit allows the capacitor to generate a charging voltage corresponding to the phase of the pulsating flow. A sample-and-hold circuit takes in the charging voltage of the capacitor at predetermined timing corresponding to a change of an output of a voltage comparison circuit, and holds/outputs the taken-in voltage until next timing. | 10-04-2012 |
20120249002 | Method and Apparatus for Driving a LED with Pulses - A method and an apparatus are provided. The apparatus comprises a power source node; a light-emitting diode; a full-wave rectifier configured to produce unipolar half-waves from an alternative current mains supply connected to the power source node; and a voltage controlled switch configured to drive the light-emitting diode with pulses, each pulse derived from a half-wave, the width of the pulses being inversely proportional to mains supply voltage. | 10-04-2012 |
20120256552 | BALLAST STRUCTURE USED FOR HIGH-INTENSITY DISCHARGE LAMP - Disclosed is a ballast structure on which a high-intensity discharge lamp (HID lamp) can be installed and which can light the HID lamp; the ballast structure is provided with a base and an HID lamp seat provided on the base, and the base is provided with a direct-current (DC) boost circuit, an alternating-current (AC) rectifier circuit and an ignition circuit, all of which circuits are arranged to form a circuit functioning as a ballast; the HID lamp seat is provided with positive-electrode and negative-electrode contact ends electrically connected to positive-electrode and negative-electrode output ends of the AC rectifier circuit and of the ignition circuit of the base; and the HID lamp installed on the ballast structure can be lit and kept in normal operation by a DC current. | 10-11-2012 |
20120262077 | LED TRAFFIC SIGNAL WITH SYNCHRONIZED POWER PULSE CIRCUIT - An improved LED traffic signal is provided. The LED traffic signal suitably includes a housing with an opening, a printed circuit board coupled to the housing, and a power supply system coupled to the printed circuit board. The power supply system includes a power supply module that receives an AC input voltage from an AC input line and transforms the AC input voltage into a DC voltage with a regulated current to power the LED load, and a synchronized power pulse circuit connected to the power supply that generates a synchronized power pulse representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal. | 10-18-2012 |
20120268023 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light-emitting diode (LED) light source includes a buck-boost converter and a controller. The buck-boost converter receives an input voltage and an input current and powers the LED light source, and comprises a switch controlled by a driving signal. The controller receives a first signal indicating a current through the LED light source, and generates the driving signal based on the first signal to control the switch and to adjust the current through the LED light source. The buck-boost converter further comprises a current sensor which provides a second signal indicating an instant current flowing through the buck-boost converter, wherein the first signal is derived from the second signal, and wherein a reference ground of the controller is different from a ground of the driving circuit. | 10-25-2012 |
20120274225 | Controller Customization System With Phase Cut Angle Communication Customization Data Encoding - A controller is configured to generate one or more power control signals for a lamp to supply power to the lamp from a supply voltage. The controller is further configured to receive customization data encoded in the supply voltage. Thus, in at least one embodiment, the controller receives the customization data via one or more power terminals of the lamp. Phase cut angles in the supply voltage provided to the controller encode the customization data, and each phase cut angle encodes N symbols of data. N is an integer greater than or equal to one (1). In at least one embodiment, the customization data alters the controller from one state to another state in accordance with data represented by phase cuts in the supply voltage that encode the customization data. Examples of customization data include calibration data and configuration data. | 11-01-2012 |
20120280633 | TWO-WIRE DIMMER CIRCUIT FOR A SCREW-IN COMPACT FLUORESCENT LAMP - A dimmer switch for controlling the intensity of a dimmable screw-in compact fluorescent lamp provides smooth dimming of the fluorescent lamp and prevents flickering of the lamp due to multiple re-strikes. The dimmer switch prevents multiple re-strikes by avoiding multiple firings of a controllably conductive switching device of the dimmer circuit by limiting the high-end light intensity of the fluorescent lamp. Specifically, the dimmer switch limits the length of a conduction interval of the controllably conductive switching device to less than approximately 75% of each half-cycle. The dimmer switch may include a user-accessible adjustment actuator for changing the dimmer switch between an incandescent operating mode and a screw-in compact fluorescent mode. The dimmer switch may also be operable to automatically change the dimmer switch between the incandescent operating mode and the screw-in compact fluorescent mode by detecting the occurrence of the multiple firings of the controllably conductive switching device. | 11-08-2012 |
20120286680 | ISOLATED CAPACITOR DRIVE CIRCUIT FOR THIN-FILM SOLID-STATE LIGHTING - Solid-State lighting devices and fixtures are presented in which capacitor plates are formed in the fixture and in the lighting device to form AC coupling capacitors with one or more intervening dielectrics when the lighting device is placed in the fixture to power a driver circuit of the lighting device while providing a fixture with no exposed live wiring. | 11-15-2012 |
20120286681 | METHOD AND APPARATUS FOR DETERMINING A TARGET LIGHT INTENSITY FROM A PHASE-CONTROL SIGNAL - A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit comprises a phase-control-to-DC converter circuit that receives the phase-control voltage, which is characterized by a duty cycle defining a target intensity of the lamp tube, and generates a DC voltage representative of the duty cycle of the phase-control voltage. Changes in the duty cycle of the phase-control voltage that are below a threshold amount are filtered out by the converter circuit, while intentional changes in the duty cycle of the phase-control voltage are reflected in changes in the target intensity level and thereby the intensity level of the lamp tube. | 11-15-2012 |
20120293085 | ACTIVE DAMPER AND DRIVING METHOD THEREOF - An exemplary embodiment of the present invention relates to an active damper and a driving method thereof. An AC input passed through a dimmer is transmitted to an active damper through a rectification circuit. The active damper includes a damper resistor connected to the rectification circuit, a damper switch connected to the damper resistor in parallel, and a delay circuit delaying a turn-on time of the damper switch by a predetermined initial period from a turn-on time of the dimmer. | 11-22-2012 |
20120299493 | DIMMING ANGLE SENSING CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a dimming angle sensing circuit and a driving method thereof. | 11-29-2012 |
20120306394 | SWITCHING POWER SUPPLY CIRCUIT, SEMICONDUCTOR DEVICE, AND LED LIGHTING DEVICE - A switching power supply circuit includes a full-wave rectification circuit that performs full-wave rectification of an AC input voltage so as to generate a primary voltage, a transformer that transforms the primary voltage into a secondary voltage utilizing electromagnetic induction between first and second isolated windings, a rectifying and smoothing circuit that generates a DC output voltage from the secondary voltage so as to supply the DC output voltage to a load, a primary current control circuit that performs on/off control of primary current based on a result of comparison between a primary current detection voltage corresponding to the primary current flowing in the first winding and a first reference voltage, and a reference voltage correction circuit for monitoring an on-duty ratio of secondary current flowing in the second winding so as to correct the first reference voltage. | 12-06-2012 |
20120306395 | HID LIGHTING SYSTEM - A low-cost HID lighting system ( | 12-06-2012 |
20120313538 | DIMMING BALLAST FOR ELECTRODELESS LAMP - A ballast to energize a lamp at a selected lighting level is provided. The ballast includes a rectifier, a buck converter, and a controller. The rectifier produces a DC voltage with a substantially constant magnitude. The buck converter generates a lamp voltage output from the DC voltage based on a duty cycle. The output has a magnitude that is varied based on the duty cycle to energize the lamp at a selected lighting level. The controller receives a dim input signal indicating the selected lighting level, and provides an appropriate control signal to the buck converter. The appropriate control signal indicates a particular duty cycle corresponding to magnitude of the output to produce the selected lighting level. In response to receiving the control signal, the buck converter adjusts the duty cycle accordingly, producing the output having the magnitude to energize the lamp at the selected lighting level. | 12-13-2012 |
20120313539 | BALLAST WITH CONTROL DEVICE FOR CONTROLLING THE OPEN-CIRCUIT VOLTAGE - A ballast which controls the open-circuit voltage of the ballast. The ballast includes a power factor corrector (PFC) for receiving an AC input voltage and converting the AC input voltage into a power factor corrected DC voltage; a DC/DC converter connected to the PFC and having a switch placed at a low-voltage side of the DC/DC converter for converting the DC voltage of the PFC into a DC output voltage according to the switching operation of the switch; a controller connected to a control terminal of the switch of the DC/DC converter for sending a switching control signal to control the switch; and an open-circuit voltage controller for detecting a voltage associated with the open-circuit voltage of the ballast and regulating the duty ratio or pulse density or switching frequency of the switching control signal in response to the results of the detection, thereby controlling the open-circuit voltage. | 12-13-2012 |
20120319604 | CASCADE BOOST AND INVERTING BUCK CONVERTER WITH INDEPENDENT CONTROL - A converter system including a cascade boost converter and inverting buck converter and controller for converting a rectified AC voltage to a DC output current. The system uses inductors and is configured to use a common reference voltage. The controller is configured to control switching of the converters in an independent manner to decouple operation from each other. For example, control pulses for the boost converter may be wider than pulses for the buck converter. The controller may control the boost converter based on constant on-time control and may control the inverting buck converter based on peak current control. The rectified AC voltage may be an AC conductive angle modulated voltage, where the controller may inhibit switching of the inverted buck converter at a dimming frequency having a duty cycle based on a phase angle of the AC conductive angle modulated voltage. | 12-20-2012 |
20120326614 | LUMINAIRE - According to one embodiment, a luminaire includes a dim lighting circuit, an emergency unit, a dimming-signal input section, and a dimming control circuit. The dim lighting circuit dimly lights a light source at a dimming ratio corresponding to a dimming signal. The emergency unit includes a charging circuit for charging a battery with an external power supply in a normal time and supplies a power supply of the battery to the dim lighting circuit in an emergency. The dimming-signal input section receives the input of the dimming signal from the outside. The dimming control circuit gives the dimming signal input from the dimming-signal input section to the dim lighting circuit in a normal time and gives a dimming signal having a dimming ratio for an emergency to the dim lighting circuit in an emergency. | 12-27-2012 |
20120326615 | CURRENT CONTROL CIRCUIT AND ASSOCIATED METHOD - A current control circuit and associated method are disclosed hereby. The current control circuit has a fly-wheel circuit, comprising an inductor, a rectifier and a load; a current sense circuit, detecting a load current, configured to generate a first current signal; a compensating circuit, generating a compensating signal; a control circuit, generating a control signal according to the first current signal and the compensating signal; a first switch, coupled to the fly-wheel circuit, turned ON and OFF according to the control signal. By the effect of the compensating signal, the drift error of the average load current is prohibited. | 12-27-2012 |
20130002159 | CONTROLLING CIRCUIT FOR AN LED DRIVER AND CONTROLLING METHOD THEREOF - The present invention relates to a high efficiency light-emitting diode (LED) driver that can include a controller, an LED apparatus, an LED current sensing circuit, and a power switch. The LED current sensing circuit may be used to generate a feedback signal indicative of LED current. The controller may be coupled to the LED current sensing circuit to receive the feedback signal and generate a driving signal. The power switch may be used to operate in periodic on and off conditions to drive the LED apparatus and maintain a driving current of the LED apparatus that is substantially constant. | 01-03-2013 |
20130002160 | Switching Power Supply and Luminaire - A switching power supply includes a first switching element, a rectifying element, a first inductor and a second inductor. The first switching element supplies a power supply voltage to the first inductor and al lows a current to flow when the first switching element is on. The rectifying element is connected in series to the first switching element, and allows a current of the first inductor to flow when the first switching element is turned off. The second inductor is electromagnetically coupled to the first inductor, a potential to turn on the first switching element is induced when the current of the first inductor increases, and a potential to turn off the first switching element is induced when the current of the first inductor decreases. The induced potential is supplied to a control terminal of the first switching element. The rectifying element includes a diode and a second switching element. | 01-03-2013 |
20130002161 | LIGHT EMITTING ELEMENT DRIVING CIRCUIT - A light emitting element driving circuit comprising: a rectifying circuit; a voltage-dividing circuit; a transistor increasing or reducing a driving current of a light emitting element according to turning on or off a rectified voltage; a control circuit bringing the transistor to an on or off state at predetermined intervals and bringing the transistor to the other state when a voltage according to a current flowing through the transistor increases and becomes the reference voltage being divided voltage obtained by dividing the rectified voltage; and a voltage-dividing ratio adjustment circuit to set a voltage-dividing ratio of the voltage dividing circuit as a first voltage-dividing ratio to reduce the reference voltage when an amplitude of the rectified voltage is larger than predetermined amplitude and to set the voltage-dividing ratio as a second voltage-dividing ratio to increase the reference voltage when an amplitude of the rectified voltage is smaller than predetermined amplitude. | 01-03-2013 |
20130020953 | DISCHARGE LAMP SYSTEM AND CONTROLLING METHOD OF THE SAME - A discharge lamp system includes a discharge lamp; a power supply device for providing DC input voltage and current; a converter connected to the discharge lamp and the power supply device for providing power for the discharge lamp; a DC input voltage detecting unit connected to the power supply device for detecting the DC input voltage; a DC input current detecting unit connected to the power supply device for detecting the DC input current; a lamp state detecting unit for detecting a signal responsive to the lamp state; a controller connected to the converter, the DC input voltage detecting unit, the DC input current detecting unit and the lamp state detecting unit for controlling the discharge lamp according to the signal responsive to the lamp state, the DC input voltage and the DC input current. A controlling method for the discharge lamp system is also disclosed herein. | 01-24-2013 |
20130020954 | DISCHARGE LAMP SYSTEM AND CONTROLLING METHOD OF THE SAME - A discharge lamp system includes an AC power source, a rectifier, a power factor correction (PFC) circuit, a half-bridge circuit, and a controller. The AC power source provides an AC power. The rectifier converts the AC power into a DC power. The PFC circuit is electrically coupled to the rectifier and is configured for generating an output voltage. The half-bridge circuit is electrically coupled to the PFC circuit and a discharge lamp, and is configured for converting the output voltage into a voltage required by the discharge lamp. The controller is electrically coupled to the PFC circuit and the half-bridge circuit, and includes a timer for counting time, in which the controller controls the output voltage of the PFC circuit in accordance with a time period counted by the timer. | 01-24-2013 |
20130038229 | LIGHT-EMITTING DEVICE CONTROL CIRCUIT - In a control circuit for a light-emitting device, a reference voltage generation circuit detects a full-wave rectified voltage and generates a first voltage as well as generating a second voltage by converting the rectified voltage into a DC voltage. A voltage corresponding to a difference between the first voltage and the second voltage or a voltage corresponding to a ratio of the first voltage to the second voltage is generated as a reference voltage by a subtraction circuit or by a division circuit, respectively. As a result, a change in amplitude of the reference voltage can be suppressed when amplitude of the rectified voltage is varied due to a variation in an AC input voltage supplied from an AC power supply. | 02-14-2013 |
20130049617 | LOAD COMPENSATION FOR AN ELECTRONIC TRANSFORMER IN A LED ILLUMINATION SYSTEM - The invention relates to a light emitting diode (LED) illumination system, and more particularly, to systems, devices and methods of rapidly ramping up a transformer current and a LED driver current by coupling a transformer load compensation circuitry to an output of an electronic transformer. A bridge rectifier is coupled to the electronic transformer and provides full-wave rectification to an AC supply at the output of the electronic transformer. The load compensation circuitry senses the rectified AC supply and compensates the load of the electronic transformer, such that the electronic transformer starts up properly when the level of the signal envelope is below a threshold voltage. Therefore, the load compensation circuit is active for a programmed time during which the LED driver current has been increased to a sufficient value to keep the electronic transformer operational. | 02-28-2013 |
20130049618 | ADAPTIVE CIRCUIT - The invention describes an adaptive circuit ( | 02-28-2013 |
20130057167 | DAMPER CIRCUIT FOR SWITCHED DIMMING - A power converter includes dimmer circuit, a rectifier circuit, and a thyristor damper circuit. The dimmer circuit provides a dimmer voltage in response to an input voltage. The rectifier circuit provides a rectified voltage in response to the dimmer voltage. The thyristor damper circuit dampens an input current associated with the rectified voltage based on the input current and ceases dampening the rectified voltage based on the rectified voltage. | 03-07-2013 |
20130057168 | Lighting Systems - A power adaptor for a solid state light source is disclosed. The power adaptor comprises an input ( | 03-07-2013 |
20130057169 | FLICKERING SUPPRESSOR SYSTEM FOR A DIMMABLE LED LIGHT BULB - A flicker suppression system for a dimmable LED bulb. In one embodiment, the system includes a rectifier circuit having input terminals and output terminals. The rectifier circuit is configured to rectify a line voltage to generate a rectified voltage at its output terminals. A resistor and switch are also included and coupled in series. A switch control circuit is directly coupled between the output terminals and configured to control the switch only as a function of the rectified voltage. | 03-07-2013 |
20130057170 | AC/DC CONVERTER HAVING A SWITCHABLE PFC, A CONTROLLER THERFOR, AND A METHOD OF OPERATING A CONTOLLER - A method of controller an AC/DC to converter is disclosed, the converter having a power factor correction stage and a signal indicative of a required power and operating with a switching cycle having a switching frequency being the inverse of a switching period. The method comprises switching on the PFC stage, in response to a signal indicative of an average switching frequency rising above a first threshold. The method further comprises switching off the PFC stage, in response to the signal indicative of an average switching frequency falling below a second threshold. The method may further comprise switching on the PFC stage, in response to a positive step change in the signal indicative of a required power, and switching off the PFC stage, in response to indicative step change in the signal indicative of a required power. | 03-07-2013 |
20130057171 | LOW CURRENT SOLUTION FOR ILLUMINATED SWITCHES USING DC OPERATED LEDS - A switch circuit utilizes an LED for illumination. A diode is connected in parallel with the LED but in opposite orientation, with the LED anode connected to the diode cathode, and the LED cathode connected to the diode anode, to permit discharging of a power supply capacitor of a ballast of a lamp such as a compact fluorescent light (CFL) bulb. Undesirable flickering of the CFL are then avoided. | 03-07-2013 |
20130063037 | Electronic Ballast for a High Intesity Discharge Lamp - An electronic ballast includes a power factor corrector having an input side for receiving an AC input voltage from a voltage source, and including first and second power switches connected in series across an output side. Each of the first and second power switches is operable based on a corresponding one of a first and second control signals in one of an ON-state and an OFF-state. The power factor corrector is operable to output at the output side a boosted DC voltage output corresponding to the AC input voltage in response to operation of the first and second power switches. A buck circuit receives the boosted DC voltage output from the power factor, and is operable based on the boosted DC voltage output to output an AC voltage output in the form of an AC square wave signal to a high intensity discharge lamp. | 03-14-2013 |
20130069548 | Switching Power Supply, Luminaire, and Control Method for the Luminaire - A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit. | 03-21-2013 |
20130069549 | LED Light For Examinations And Procedures - A light is provided having a base unit, an arm extending from the base unit, and a lamp head coupled to the arm. The lamp head includes an LED configured to provide light based on an input drive current, an optical mixing element configured to collect the light produced by the LED and a zoom lens configured to adjust an output size of a spot generated by the light collected in the mixing element. A controller receives DC power from the base unit through the arm. The controller is configured to set the input drive current for the LED to control an output light density of the spot in response to an operator selected input and configured to adjust the output light density of the spot in response to a change in the size of the spot. | 03-21-2013 |
20130076255 | LIGHT EMITTING DIODE LIGHTING APPARATUS - A light emitting diode (LED) lighting apparatus boosts alternating current (AC) power output from a ballast, rectifies the boosted AC power to direct current (DC) power, blocks generation of an inrush current while the boosted AC power is rectified, and controls an operation of an LED by using the DC power. | 03-28-2013 |
20130088161 | DRIVING CIRCUIT OF LIGHT EMITTING DIODE - A driving circuit of a light emitting diode (LED) including an AC power, a rectifier, a power converter, a waveform sampler, and a control circuit is provided. The AC power provides an AC signal. The rectifier is coupled to the AC power and outputs a driving signal. The power converter is coupled to the rectifier. The power converter includes an LED and outputs a first signal positive correlated with a current passing through the LED. The waveform sampler is coupled between the AC power and the rectifier, and outputs a second signal directly proportional to the AC signal. The control circuit is coupled between the waveform sampler and the power converter, and outputs a control signal to the power converter according to a comparison result between the first signal and the second signal. | 04-11-2013 |
20130093341 | AC LED DIMMER AND DIMMING METHOD THEREBY - The disclosure relates to an AC LED dimmer and dimming method thereof. The AC LED dimmer includes a rectifier receiving AC voltage from an AC voltage source and full-wave rectifying the AC voltage; a direct current (DC)/DC converter receiving the full-wave rectified voltage from the rectifier, generating a full-wave rectified stepped-up voltage, and generating a pulse enable signal; a pulse width modulation controller receiving the full-wave rectified stepped-up voltage and generating a pulse width modulation signal to dim an AC LED in response to the pulse enable signal; a switch driving the AC LED under control of the pulse width modulation signal, and an electromagnetic interference (EMI) filter to be connected between the AC voltage source and the switch to eliminate electromagnetic interference from the AC voltage source. Accordingly, the dimmer can perform an efficient and linear dimming function and suppress harmonics. | 04-18-2013 |
20130099688 | CONTINUOUS DIMMING AC LED DEVICE - A continuous dimming AC LED device is operated in association with a dimmer. When the dimmer adjusts brightness, the voltage supplied to the AC LED driver is reduced to decrease the brightness of an LED unit. When the supplied voltage is reduced to a working voltage required by the AC LED driver, a control unit detects the supplied voltage being lower than the working voltage, A control end of a voltage-controlled switch disconnects from the AC LED driver and connects to a power supply. Therefore, even the supply voltage is below the working voltage of the AC LED driver, the LED unit is prevented from being immediately turned off to maintain some brightness. With the dimmer, the brightness of the LED continuously and gradually. changes from full brightness to darkness, | 04-25-2013 |
20130106301 | LIGHT SOURCE AND LIGHTING DEVICE INCLUDING THE SAME | 05-02-2013 |
20130113386 | LED Current Control In A Dimmable LED Illumination System - The invention relates to a light emitting diode (“LED”) illumination system, and more particularly, to systems, devices and methods of driving a LED module by a current generator that is powered and controlled by a regulated dc voltage associated with a brightness level. Such a dimmable LED illumination system is compatible with both a high-voltage ac signal coupled from any wall outlet and a low-voltage ac signal provided by an electronic transformer. A diode bridge rectifies the ac signal to a rectified ac signal, and a LED driver generates the LED current from the rectified ac signal and drives the LED to the brightness level. Within the LED driver, the level of the LED current is determined from a boost voltage that is substantially a regulated dc voltage generated from the rectified ac signal. | 05-09-2013 |
20130119878 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectification circuit, a smoothing capacitor, a waveform shaping circuit, and a DC-DC converter. The rectification circuit rectifies an AC voltage input thereto. | 05-16-2013 |
20130119879 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectifying circuit, a smoothing capacitor, a reference voltage generating circuit, and a DC-DC converter. The rectifying circuit rectifies an AD voltage input thereto. The smoothing capacitor smoothes an output from the rectifying circuit. The reference voltage generating circuit generates a reference voltage on the basis of at least any one of an output voltage of the rectifying circuit and a voltage from the smoothing capacitor. The DC-DC converter includes an output element and a constant current element, and converts the voltage of the smoothing capacitor. The output element receives a supply of a voltage of the smoothing capacitor, oscillates by performing a switching operation which repeats an ON state and an OFF state when the reference voltage is relatively high, and continues the ON state when the reference voltage is relatively low. | 05-16-2013 |
20130127355 | STARTING CIRCUIT FOR BUCK CONVERTER - A ballast to energize a lamp is provided. The ballast comprises a buck converter connected to an inverter via a switching component. The buck converter includes a transistor, a capacitor, a diode, and an inductor. The switching component has a predetermined breakover voltage value and is configured to provide a start up signal to the inverter when voltage at the switching component increases to the predetermined breakover voltage value. A control circuit is configured to monitor the voltage at the switching component while the voltage at the switching component increases to the predetermined breakover voltage, and is configured to generate a gate drive pulse at a gate terminal of the transistor when the voltage at the switching component reaches a predetermined voltage that is less than the breakover voltage of the switching component. | 05-23-2013 |
20130127356 | LED DRIVING POWER SUPPLY APPARATUS AND LED LIGHTING APPARATUS - An LED driving power supply apparatus and an LED lighting apparatus is provided in which stable dimming is realized even when dimming is performed in a range that includes a light-off state. A power conversion control circuit controls the on time or switching period of a switching device in accordance with a feedback control signal input through an insulating member, operates as a PFC converter, and controls power supplied to the LED. A dimming control circuit includes a constant current control circuit, a constant voltage control circuit, and an OR gate circuit. When the external dimming signal is a signal specifying normal lighting, the constant current control circuit maintains a current supplied to the LED at a target current. When the external dimming signal is a signal specifying a minimum luminance, the constant voltage control circuit maintains a voltage applied to the LED at a target voltage. | 05-23-2013 |
20130127357 | POWER FACTOR CORRECTION CIRCUIT OF AN ELECTRONIC BALLAST - This invention relates to a power factor correction circuit of an electronic ballast. The electronic ballast includes a rectification circuit, a first capacitive element and an inverter. The power factor correction circuit comprises a unidirectional element, an inductive element and a second capacitive element. The unidirectional element is connected in series with the inductive element, and the second capacitive element is connected in parallel with the unidirectional element and the inductive element. A junction of the unidirectional element and the second capacitive element is coupled to a first output terminal of the rectification circuit, a junction of the inductive element and the second capacitive element is coupled to an input terminal of the inverter, and the first capacitive element is coupled between a second output terminal of the rectification circuit and a junction of the unidirectional element and the inductive element. It was found that a power factor correction circuit according to an embodiment of the present invention can increase the power factor of an electronic ballast to a high value, such as 0.98, while the size of the power factor correction circuit is small enough to be implemented in a small size lamp. | 05-23-2013 |
20130134890 | Arc Extinction Arrangement and Method for Extinguishing Arcs - In a method for extinguishing an arc in a gas discharge chamber in which power is supplied to a gas discharge chamber and in which both with a current flow in a first direction and with a current flow in a second inverse direction there is produced a gas discharge, when an arc is identified, the power supply to the gas discharge chamber is interrupted, and residual energy which is in a supply line to the gas discharge chamber and/or in the gas discharge chamber is supplied to an energy store. | 05-30-2013 |
20130140999 | METHODS AND APPARATUS FOR DRIVING LIGHT EMITTING DIODES (LEDS) COMPRISING PARALLEL FLYBACK CONVERTER STAGES - An apparatus ( | 06-06-2013 |
20130147376 | EMERGENCY LIGHTING SYSTEMS INCLUDING BIDIRECTIONAL BOOSTER/CHARGER CIRCUITS - An emergency lighting module for providing emergency power to a solid state luminaire is provided. The emergency lighting module includes a control circuit configured to detect a line voltage, a first input configured to receive an input voltage from the solid state luminaire, and a bidirectional booster/charger circuit coupled to the microcontroller and configured to charge a battery using the input voltage. The bidirectional booster/charger circuit is further configured to provide an output voltage. The emergency lighting module is configured to provide the output voltage to the solid state luminaire in response to a reduction of the line voltage. | 06-13-2013 |
20130154491 | EFFICIENCY REGULATION FOR LED ILLUMINATION - Various embodiments of the present invention relate to a switch-mode regulator, and more particularly, to systems, devices and methods of using a switch-mode regulator to regulate an LED current to improve overall LED system efficacy and suppress power consumption of a dimmable LED illumination system. Both high and moderate brightness modes are implemented in an LED driver based on the switch-mode regulator. In the high brightness mode, the LED current is larger than a preferred LED current. In the moderate brightness mode, the LED current is smaller than the preferred LED current, and the LED driver sustains the preferred driver efficiency while the LED current remains as a direct current. Such a switch-mode power supply or regulator may also be used in applications other than the LED illumination system. | 06-20-2013 |
20130154492 | Improvements relating rectifier circuits - A rectifier circuit is disclosed comprising input terminals adapted to receive an alternating current voltage, and output terminals adapted to provide an output having a rectified output voltage. The rectifier circuit has a diode bridge in which the diodes are each adapted to be by-passed by a low-impedance path on activation of an associated electronic switching device (Q | 06-20-2013 |
20130162154 | DRIVING APPARATUS FOR LIGHT EMITTING DIODE - There is provided a driving apparatus for a light emitting diode (LED) comparing a rectified power voltage level with an LED current to limit current applied to an LED, thereby reducing the amount of heat generated therein. The driving apparatus for an LED includes a detecting unit detecting a voltage level of rectified power; and a driving unit comparing a level of current flowing in an LED unit having at least one LED with detection results from the detecting unit, and limiting current applied to the LED unit to drive the LED unit according to comparison results. | 06-27-2013 |
20130162155 | LIGHTING CIRCUIT AND ILLUMINATION DEVICE - A lighting circuit according to embodiments includes: a self-hold element connected in series to an AC power source that generates power for lighting an illumination load, together with the illumination load, the self-hold element being configured to control supply of the power provided by the AC power source to the illumination load by the self-hold element being turned on/off; a noise prevention circuit connected in parallel to the self-hold element; and a damping circuit configured to connect a damping resistance to the noise prevention circuit parallely only for a predetermined period from turning-on of the self-hold element, thereby preventing the self-hold element from being repeatedly turned on/off during a period in which the self-hold element is on under normal conditions, due to a transient during power supply. | 06-27-2013 |
20130169176 | NON-ISOLATED AC/DC CONVERTER WITH POWER FACTOR CORRECTION - A non-isolated AC/DC converter having power factor correction, comprising an active switch connected to a waveform controller for control, and sequentially showing conduction, cut off, making the alternating current power supply pass through one circuit rectifier for rectifying and forming one positive half sine wave electricity supply, which passes through a voltage step-down circuit to proceed with decreasing the voltage, then passing through a filter/storage circuit for filtering and forming direct current power supply, which is stored on this filter/storage circuit, then releasing the energy and supplying electricity to the electricity end; as a transformer isn't required, the circuit volume can be reduced, lowering costs, raising circuit conversion rates and achieving power factor correction and increasing the lifespan of the transformer, moreover, through the waveform controller controlling the output waveform, the storage circuit utilizes a lower capacity capacitor to avoid using an electrolytic capacitor, thereby increasing the circuits lifespan. | 07-04-2013 |
20130169177 | Active Bleeder Circuit Triggering TRIAC in All Phase and Light Emitting Device Power Supply Circuit and TRIAC Control Method Using the Active Bleeder Circuit - The present invention discloses an active bleeder circuit capable of triggering a tri-electrode AC switch (TRIAC) circuit in all phase. The active bleeder circuit receives a rectified signal having an OFF phase and an ON phase. The active bleeder includes: a detection circuit for generating a detection signal according to the rectified signal and accumulating the detection signal in the OFF phase of the rectified signal; and a current sinker circuit coupled to the detection circuit, for generates a latching current to trigger the TRIAC circuit by operating a switch when the detection signal exceeds a predetermined level. The present invention also discloses a light emitting device power supply circuit and a TRIAC control method using the active bleeder circuit. | 07-04-2013 |
20130175936 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver and driving method thereof. In one embodiment, a high efficiency LED driving method configured for a LED device can include: (i) receiving a DC bus voltage and generating a driving voltage for the LED device through a power switch; (ii) comparing the DC bus voltage against a sum of the driving voltage and a first reference voltage; (iii) where when the DC bus voltage is greater than the sum of the driving voltage and the first reference voltage, generating a first output current; (iv) where when the DC bus voltage is greater than the driving voltage and less than the sum of the driving voltage and the first reference voltage, generating a second output current; and (v) matching an average current of the first output current and the second output current with a corresponding driving current. | 07-11-2013 |
20130175937 | WIRELESS POWER SUPPLY SYSTEM FOR LIGHTING AND LIGHTING APPARATUS - A wireless power supply system for lighting includes: a power transmission unit including a power transmission coil; and a power reception unit including a power reception coil. The power transmission coil generates an AC magnetic field in response to a supplied AC power. The power reception coil receives an electric power from the power transmission unit through an electromagnetic induction due to the AC magnetic field generated by the power transmission coil. The power reception unit further includes a power circuit and a receive-side control section. The power circuit receives an output power from the power reception coil and to perform Buck-Boost operation so as to output a predetermined electric power to a lighting load. The receive-side control section controls the Buck-Boost operation of the power circuit. The power circuit is configured to be capable of boosting and stepping-down of the output power from said power reception coil. | 07-11-2013 |
20130181624 | FEED FORWARD IMBALANCE CORRECTOR CIRCUIT - A circuit includes a first active device is coupled between a third terminal and a second terminal. The first active device has a control terminal coupled a first terminal to receive a signal representative of a rectified input voltage. A second active device is coupled between the control terminal of the first active device and the second terminal. The second active device has a control terminal coupled to a fourth terminal. The second active device is coupled to be controlled in response to a bypass voltage at the fourth terminal. The first active device is coupled to be controlled in response to the rectified input voltage and the bypass voltage. | 07-18-2013 |
20130181625 | SINGLE STAGE ELECTRONIC BALLAST WITH POWER FACTOR CORRECTION - A single stage electronic ballast with power factor correction is provided. The single stage electronic ballast can work under the present intensity discharge lamp without any change and provide higher efficient, lower power consumption of lighting system, and better lighting quality of lamps. The single stage electronic ballast can also provide a stable current to load (lamp) for a long time. The single stage electronic ballast includes a first switch and a second switch that are controlled with complementary switching so as to provide an output voltage in response to the input power source and the variation of the load. | 07-18-2013 |
20130181626 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver, and driving methods thereof. In one embodiment, a high efficiency LED driving method can include: (i) receiving an AC input voltage to obtain an absolute value thereof; (ii) receiving a DC bus voltage, and driving the LED device through a power switch; (iii) generating a first reference voltage according to a driving current and an expected driving current; (iv) comparing the absolute value against a sum of a driving voltage and the first reference voltage; (v) when the absolute value is greater than the sum of the driving voltage and the first reference voltage, turning off the power switch; and (vi) when the absolute value is greater than the driving voltage but less than the sum of the driving voltage and the first reference voltage, turning on the power switch to generate an output current. | 07-18-2013 |
20130187557 | MULTI-LEVEL ADAPTIVE CONTROL CIRCUITRY FOR DEEP PHASE-CUT DIMMING COMPACT FLUORESCENT LAMP - An electronic ballast has a rectifying circuit for rectifying an input voltage controlled by a phase dimmer. The electronic ballast has an averaging circuit for averaging current received from the rectifying circuit to produce a reference voltage. The electronic ballast has a control integrated circuit for providing an output current to a compact fluorescent lamp by performing a linear to logarithmic conversion of the reference current, according to a predefined conversion function. | 07-25-2013 |
20130187558 | Power Supply Circuit for Driving Light Emitting Diode - The present invention relates to a power supply circuit for driving at least one light emitting diode (LED). The power supply circuit comprises: an input unit, an active power factor corrector, a converter, an output unit and a feedback unit. The input unit is utilized to receive power signal from a power source, and the output unit is utilized to receive power transferred from the converter for driving at least one LED. The feedback unit couples to a node between the converter and the output unit, and delivers the power signal, from the converter to the output unit, back to the active power factor corrector. The active power factor corrector monitors the power signal based on the power signal from the feedback unit for stabilizing the outputting power from the output unit and thereby driving the LED. | 07-25-2013 |
20130193863 | Power Supply Device and Lighting Equipment Provided with Power Supply Device - A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal. | 08-01-2013 |
20130207561 | LED Light Tube and A Circuit Module for the Same - The invention relates to an LED light tube and a circuit module for the same, wherein the circuit is located in a light tube body and includes a rectifying unit, a current regulating and voltage regulating unit, and an LED unit. The light tube body can be installed in a lamp-holder of a fluorescent tube without changing a starter and a ballast. The rectifying unit has two power terminals connected to electrodes of the light tube body for receiving a mains power and the rectifying unit via the electrodes. The rectifying unit converts the mains power to a sign wave DC voltage. The current regulating and voltage regulating unit is connected to the rectifying unit for converting the mains power to a working power. The LED unit is electrically connected to the current regulating and voltage regulating unit for receiving the working power to emit light. | 08-15-2013 |
20130214692 | Method for transmitting control information from a control apparatus to an operating device for at least one light-emitting means and operating device for at least one light-emitting means - A method for transmitting control information from a control apparatus to an operating device for a light-emitting means may include a) modulating control information onto a supply line by means of the control apparatus during a modulation phase, wherein a switchable shunt of the device is connected between the first and second supply connections; b) decoding the control information in a decoder of the device; b1) activating the demodulation by the decoder when the absolute value for the voltage at the two supply connections falls below a first threshold value; and c) actuating a converter of the operating device in accordance with the decoded control information. | 08-22-2013 |
20130221862 | Method and System for Avoiding Flicker of SSL Devices - This disclosure relates to illumination systems. In particular it relates to a method and system for avoiding flicker (in particular 100 Hz or 120 Hz flicker) in solid state lighting devices such as LED or OLED assemblies. A controller for a driver circuit of a solid state lighting device (SSL) is described. The driver circuit comprises a power converter to convert a varying input voltage into a drive voltage for the SSL device. The input voltage is derived from a rectified AC mains voltage and frequency. The power converter is used with a maximum voltage step-up conversion ratio. The controller synchronizes to the mains frequency and determines a plurality of pulse intervals repeated at a pulse frequency where the pulse frequency is greater than a perceptual frequency of light intensity variations perceivable by a human eye. | 08-29-2013 |
20130221863 | GENERATOR SUITABLE FOR POWERING A DENTAL CURING LIGHT - The generator for a piezoelectric motor is also suitable for powering a high power LED for a dental polymerisation lamp via a rectifier, and comprises two transformers each including a primary winding and a secondary winding and four switches controlled by an ultrasonic reference oscillator, two switches being arranged to alternately connect the secondary windings of the two transformers to the piezoelectric load, and the other two switches being arranged to alternately connect the two primary windings to a voltage supply so that during the positive alternation, the primary winding of one of the transformers is charged with energy whereas the secondary winding of the other transformer is discharged into the piezoelectric load, and so that during the negative alternation, the secondary winding of the first transformer discharges the energy thereof whereas the primary winding of the first transformer is charged. | 08-29-2013 |
20130221864 | LED LIGHTING CIRCUIT, LED ILLUMINATION DEVICE, AND LED ILLUMINATION UNIT SOCKET - The purpose of the present invention is to provide an LED lighting circuit, which can normally light an LED even if an alternating current power supply is an electronic transformer, an LED illuminating device, and a socket for an LED illuminating unit. Disclosed is an LED lighting circuit includes a rectifier circuit for rectifying an AC output from an AC power supply, an LED drive unit, which drives the LED by having rectifying output inputted thereto from the rectifying circuit, a reverse current preventing unit, which is provided between the rectifying circuit and the LED drive unit, and a terminal voltage control unit, which reduces the output terminal voltage of the rectifying circuit in the case where the alternating current output from the alternating current power supply is unstable or stopped. Also provided are an LED illuminating device, and a socket for an LED illuminating unit. | 08-29-2013 |
20130229121 | POWER SUPPLY FOR ILLUMINATION AND LUMINAIRE - A power supply for illumination includes a detection circuit and a control circuit. The detection circuit compares an AC voltage whose phase is controlled with a first threshold voltage so as to detect a variation in a conduction state of phase control in the AC voltage, and compares the AC voltage with a second threshold voltage lower than the first threshold voltage so as to detect a zero-cross point of the AC voltage, thereby detecting a conduction period of the phase control. The control circuit outputs an output current according to the duration of the conduction period. | 09-05-2013 |
20130229122 | ILLUMINATION DEVICE INCLUDING LEDS AND A SWITCHING POWER CONTROL SYSTEM - Disclosed herein is an illumination device having at least one LED and a power converter with a switching element for connection to an existing fluorescent lamp fixture including a conventional ballast. The illumination device includes a feedback circuit operable to provide a switching signal to the switching element according to a duty cycle, the feedback circuit configured to: increase the value of the duty cycle to decrease an output current signal through the at least one LED; and decrease the value of the duty cycle to increase the output current signal through the at least one LED. | 09-05-2013 |
20130234612 | BLEND DIMMING CIRCUITS AND RELEVANT METHODS - The present disclosure relates to blend dimming circuits and methods for driving light loads. In one embodiment, a method can include: converting an external sinusoidal AC power supply to a phase-missing DC voltage signal; detecting a conduction angle of the phase-missing DC voltage signal to generate a first control signal representing the conduction angle; generating an analog dimming signal based on the first control signal; generating, by a PWM dimming circuit, a PWM dimming signal based on the analog dimming signal and a light load feedback signal; regulating light load brightness by PWM dimming when the conduction angle is greater than a threshold angle; regulating the light load brightness by PWM and analog dimming when the conduction angle is less than the threshold angle; and enabling a power stage circuit when the first control signal is active to regulate the brightness of the light load. | 09-12-2013 |
20130234613 | Power Conversion and Control Systems and Methods for Solid-State Lighting - A power conversion and control system suitable for use with solid-state lighting and conventional TRIAC dimmer switching includes an alternating current to direct current (AC-DC) converter configured to convert AC power from the AC mains to DC power and a controller configured to control dimming of a light-emitting load depending on the magnitude of a distorted AC voltage from an external TRIAC dimmer switch relative to the magnitude of the DC voltage Vdc produced by the AC-DC converter. To prevent the TRIAC in the external TRIAC dimmer switch from turning off in situations where the AC-DC converter is disconnected from the AC mains or not drawing any current from the AC mains, the power conversion and control system may further include circuitry that maintains the current through the TRIAC above its minimum holding current. | 09-12-2013 |
20130241424 | LED DIMMING DEVICE AND LED DIMMING AND DRIVING CIRCUIT - A LED dimming device, and a LED dimming and a driving circuit using such LED dimming device are discussed. In present embodiment, the LED dimming device multiplexes an inputting switch and/or a sampling module of the LED driving circuit for dimming. such LED dimming device will not affect the sine waves of input current, in such a way, power factor and work efficiency will be increased while the harmonic coefficient and interference signal will be reduced. | 09-19-2013 |
20130241425 | LED DRIVER CIRCUIT - In order to supply power and control the power supplied to an LED ( | 09-19-2013 |
20130241426 | LED LIGHT COMPRISING AN INTEGRATED DRIVER - Disclosed is an LED light comprising at least one LED ( | 09-19-2013 |
20130257301 | COMPACT, CONFIGURABLE POWER SUPPLY FOR ENERGIZING OZONE-PRODUCING CELLS - Improvements in the supply of high-frequency electrical power to ozone-producing cells can be accomplished using the systems and techniques described herein. Application of a DC-DC converter operating at a switching frequency substantially greater than a load frequency, supports generation of a high-voltage AC for powering such cells, while allowing for reductions in component size and reductions in a quality factor of a load tuning circuit. Controllable power inverters used in obtaining one or more of the switching and load frequencies can be controlled using feedback techniques to provide stable, high-quality power to ozone-producing cells under variations in one or more of externally supplied power and load conditions. An inrush protection circuit can also be provided to selectively introduce a current-limiting resistance until an input DC bus has been sufficiently initialized as determined by measurements obtained from the DC bus. The current limiting resistance can be a positive-temperature coefficient thermistor. | 10-03-2013 |
20130257302 | DIMMER COMPATIABLE LED BULB DRIVER CIRCUIT - A light-emitting diode (LED) bulb for use with a leading-edge dimmer includes a shell and an LED contained within the shell. A base is attached to the bulb for connecting the LED bulb to an electrical socket. A driver circuit is configured to provide current to the LED. The driver circuit has an input filter circuit that includes a first inductor. In response to the input filter receiving a switched AC voltage from a leading-edge dimmer set to dim at 50%, the first inductor is configured to saturate. In response to an undimmed AC voltage from the leading-edge dimmer, the first inductor is configured to not saturate. The input filter also includes a bridge rectifier connected to the first inductor. | 10-03-2013 |
20130264959 | Lighting Device - To provide a lighting device in which the luminance of an EL element is maintained even when the EL element deteriorates so that degradation of the lighting device is reduced, the lighting device includes a surface light source portion including an organic EL element, and a control circuit portion provided in a base portion. The control circuit portion counts a lighting time of the organic EL element and controls the luminance of the organic EL element in accordance with the lighting time. Accordingly, the lighting device in which the luminance of an EL element is maintained regardless of degradation of the EL element so that degradation of the lighting device is reduced can be provided. | 10-10-2013 |
20130278159 | BLEEDER CIRCUIT FOR USE IN A POWER SUPPLY - A bleeder circuit for use in a power supply of a lighting system includes a first terminal to be coupled to a first input of the power supply. A second terminal is to be coupled to a second input of the power supply. An edge detection circuit is coupled between the first and second terminals of the bleeder circuit. The edge detection circuit is coupled to output an edge detection signal in response to an input signal between the first and second inputs. A variable current circuit is coupled to the edge detection circuit and coupled between the first and second terminals of the bleeder circuit. The variable current circuit is coupled to conduct a bleeder current between the first and second terminals of the bleeder circuit in response to the edge detection signal. | 10-24-2013 |
20130278160 | ILLUMINATION DEVICE WITH ADJUSTABLE LUMINANCE AND LUMINANCE ADJUSTMENT METHOD THEREOF - The present application relates to an illumination device having a light source module, a power supply module, a driving module, a control module and a start module. The driving module outputs a driving current to the light source module based on a power supply from the power supply module. The control module controls the magnitude of the driving current based on a first voltage signal generated by the power source module. After receiving the first voltage signal, the control module controls the driving module to steadily increase the driving current in a first stage output. After receiving the first voltage signal again, the control module controls the driving module to output a constant driving current equal to the driving current at the end of the first stage. | 10-24-2013 |
20130278161 | LED LIGHTING DEVICE USING BALLAST FOR FLUORESCENT LAMP - Disclosed is an LED lighting device using a ballast for a fluorescent lamp, the LED lighting device including: an LED part which includes at least one LED device; a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp; and a controller which receives an output signal of the rectifier and controls power transmitted from the ballast to the LED part. | 10-24-2013 |
20130293130 | High Efficiency 3-Way Halogen Lamp With Diode and Sidac Driven Single Filament Lamp - A 3-way halogen lamp selectively generates different first, second, and third light levels. A first terminal on the lamp base receives a first input voltage waveform when the first terminal is connected to a power source. A second terminal on the lamp base receives a second input voltage waveform when the second terminal is connected to the power source. A rectifier circuit is connected to the first terminal for receiving the first input voltage waveform and rectifying the first input voltage waveform to generate a first load voltage waveform. A switching circuit is connected to the second terminal for receiving the second input voltage waveform and phase clipping the second input voltage waveform to generate a second load voltage waveform. A single filament is connected to the rectifier circuit and the switching circuit, and is housed in a halogen capsule attached to the lamp base. | 11-07-2013 |
20130293131 | Solid State Semiconductor LED Replacement for Fluorescent Lamps - Various apparatuses and methods for replacing a fluorescent lamp with a non-fluorescent tube are disclosed herein. For example, some embodiments provide an apparatus for replacing a fluorescent lamp, including an electrical connector adapted to electrically connect to a fluorescent lamp fixture, a DC rectifier connected to the electrical connector, a voltage converter connected to the DC rectifier, and a non-fluorescent light source connected to the voltage converter. The DC rectifier, voltage converter and non-fluorescent light source are substantially contained within a housing that is physically configured to replace the fluorescent lamp in a fluorescent lamp fixture. | 11-07-2013 |
20130300303 | Constant Voltage Dimmable LED Driver - A constant voltage dimmable LED (Light Emitting Diode) driver is disclosed that is compatible with all types of dimmers, including conventional phase cut (TRIAC) dimmers, and behaves like a conventional constant voltage driver which can be connected to any size of LED load that has a matching voltage rating. The driver produces a continuous train of pulses for driving the LED load and obtains an averaged measure of the voltage at the AC input for controlling the duty cycle of the continuous train of pulses. Therefore, when the averaged measure of the voltage at the AC input is reduced by a dimmer, the duty cycle reduces, resulting in a dimmed LED. The driver can be created by adding a few components to a conventional wide input range AC-DC converter without or with very little modifications. | 11-14-2013 |
20130307425 | CONSTANT CURRENT CONTROL BUCK CONVERTER WITHOUT CURRENT SENSE - A light emitting diode (LED) controller provides constant current regulation for a converter circuit providing current to an LED. The LED controller senses an inductor voltage and determines an inductor reset time from the sensed inductor voltage. Based on the determined inductor reset time, a switch on time and a switch period, the LED controller generates a control signal modifying the state of a switch coupling the converter circuit to an input voltage. | 11-21-2013 |
20130307426 | POWER SUPPLY AND METHOD FOR ELECTRIC LIGHTING DEVICE - Disclosed herein are a power control system ( | 11-21-2013 |
20130313989 | HIGH EFFICIENCY LED DRIVERS WITH HIGH POWER FACTOR - The present invention relates to a high efficiency, high power factor LED driver for driving an LED device. In one embodiment, an LED driver can include: an LED current detection circuit coupled to the LED device, and configured to generate a feedback signal that represents an error between a driving current and an expected driving current of the LED device; a power stage circuit, where a first power switch terminal is coupled to a first input voltage, and a second power switch terminal is coupled to ground; and a control circuit configured to generate a control signal according to the feedback signal and a drain-source voltage of the power switch, where the control signal, in each switch period, turns on the power switch when the drain-source voltage reaches a low level, and turns off the power switch after a fixed time interval based on the feedback signal. | 11-28-2013 |
20130320871 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 12-05-2013 |
20130342121 | Luminaire - According to one embodiment, a luminaire includes a rectifying section configured to rectify a voltage of an alternating-current power supply, a power converting section configured to receive an input of an output voltage of the rectifying section and supply required output power to a lighting load, an output control section capable of controlling the operation and output electric energy of the power converting section, a dimming operation terminal device operated to thereby determine a dimming amount of the lighting load, a dimming control section formed to be capable of energizing the dimming operation terminal device and configured to create a dimming signal on the basis of an energizing electric signal that changes according to the dimming operation terminal device and transmit via a first electric insulating section a signal for controlling the output electric energy of the power converting section according to the dimming signal. | 12-26-2013 |
20130342122 | SWITCHING CURRENT CONTROL CIRCUIT, LED DIMMER SYSTEM, AND LED ILLUMINATION DEVICE - The switching current control circuit includes a switching pulse supply circuit, a comparator circuit, and analog circuit unit, a digital circuit unit, etc. The A/D converter ( | 12-26-2013 |
20130342123 | TRAILING EDGE DIMMER COMPATIBILITY WITH DIMMER HIGH RESISTANCE PREDICTION - In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one embodiment, the controller is capable of predicting an estimated occurrence of a trailing edge of a phase cut AC voltage and accelerating a transition of the phase cut AC voltage from the trailing edge to a predetermined voltage threshold. In at least one embodiment, the controller predicts an estimated occurrence of the trailing edge of the phase cut AC voltage on the basis of actual observations from one or more previous cycles of the phase cut AC voltage. | 12-26-2013 |
20140001971 | DIM MODE START FOR ELECTRODELESS LAMP BALLAST | 01-02-2014 |
20140001972 | MODULAR LIGHTING CONTROL | 01-02-2014 |
20140021873 | Power Transformation Apparatus Between DC Light Element and Ballast - A power transformation apparatus between DC light element and ballast includes a first fluorescent emulation module, a second fluorescent emulation module and a rectifier module; wherein the first fluorescent emulation module includes two input current terminals for electrically connecting to first set of AC output terminals of the ballast, the second fluorescent emulation module also includes two input current terminals for electrically connecting to second set of AC output terminals of the ballast; two input terminals of the rectifier module are electrically connected respectively to any output terminal of first set of AC output terminals and second set of AC output terminals. The rectifier module outputs a rectified DC to supply to the DC light element as a power source. | 01-23-2014 |
20140021874 | HIGH-EFFICIENCY LED DRIVER AND DRIVING METHOD - Disclosed are LED driver circuits, and methods of driving LED loads. In one embodiment, an LED driver can include: (i) an SCR coupled to an AC power supply, and configured to generate a DC voltage through a first rectifier circuit; (ii) a first stage conversion circuit having an isolated topology with power factor correction, where the first stage conversion circuit is configured to convert the DC voltage to a first output voltage; (iii) where the first stage conversion circuit includes a transformer having a primary side coupled to the DC voltage, and a secondary side coupled to the first output voltage through a second rectifier circuit; and (iv) a second stage conversion circuit having a non-isolated topology, where the second stage conversion circuit is configured to convert the first output voltage to an output current configured to drive an LED load based on a conducting angle of the SCR. | 01-23-2014 |
20140021875 | AUXILIARY POWER SUPPLY CIRCUIT OF TWO WIRE DIMMER - An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor ( | 01-23-2014 |
20140021876 | POWER CONVERTER - The present invention includes a first DC converter converting AC voltage, into DC voltage while correcting a power factor, and a second DC converter electrically isolating the first DC converter from an LED group load, and converting the DC voltage, into a predetermined DC voltage and supply the resultant voltage to the LED group load. The second DC converter includes a current detection circuit disposed on the secondary side, and detecting current flowing into the LED group load, an error amplifier amplifying an error between a detected current value detected and a reference current value, a signal transmission isolation element transmitting a control signal based on an output signal from the error amplifier, to the primary side, and a switching element transferring power to the secondary side through the transformer by being turned on/off according to the control signal. | 01-23-2014 |
20140028208 | LIGHT SOURCE ELECTRONIC TRANSFORMER - Apparatus and methods for a light source electronic transformer. In an embodiment, a lamp includes a light source and an electronic ballast. The electronic ballast includes a main power converter, a controllable starter circuit, a transformer, a ballast control integrated circuit (IC) connected to the controllable starter circuit and having an output connected to the transformer, and an IC power converter connected to the transformer and having an output connected to the ballast control IC. When the light source is to be switched ON, the controllable starter circuit receives power from the main power converter and provides a high energy output. The ballast control IC outputs a power control signal to the transformer that illuminates the light source and the transformer to provide supply power to the IC power converter. The electronic ballast is configured such that after the light source illuminates the controllable starter circuit powers OFF. | 01-30-2014 |
20140028209 | INTERFACE CIRCUIT AND INTERFACE METHOD - Disclosed is an interface circuit including a rectifier circuit, a detection circuit, a first circuit, and a second circuit. The rectifier circuit rectifies an AC voltage input between a pair of input terminals. The detection circuit detects the AC voltage and outputs the result as a detection voltage. The first circuit is controlled to be turned on or off on the basis of an input first control signal, to cause a first current to flow between the input terminals in an on state and to cut off the first current in an off state. The second circuit is controlled to be turned on or off on the basis of an input second control signal, to allow a second current greater than the first current to flow between the input terminals in an on state and to cut off the second current in an off state. | 01-30-2014 |
20140028210 | WALL-MOUNTABLE LUMINAIRE AND ASSOCIATED SYSTEMS AND METHODS - A wall-mountable luminaire may include interchangeable adapter plugs having first and second male connectors, the first of which connects electrically and mechanically to an external electrical socket, and the second of which connects electrically and mechanically to an on-board multi-standard socket. A power supply may detect a plurality of electrical power types received from the multi-standard socket, and may condition that input power to drive LEDs. Remote computing devices may transmit control data wirelessly to direct a controller to selectively operate the LEDs to form a modified distribution pattern. A housing assembly may support wall mounting of the luminaire, and trim assembly may define a cavity that provides aesthetic and protective cover for the components carried by the housing assembly. A method aspect of the invention details steps for operating the luminaire. | 01-30-2014 |
20140028211 | FLYBACK AC-TO-DC CONVERTER - Techniques and corresponding circuitry and drivers are disclosed for improving power factor (PF) and total harmonic distortion (THD) of a flyback power factor correction (PFC) topology operating in transition-mode. In one or more embodiments, the PF and THD are improved by correcting the on-time of the switching element of the flyback PFC topology to actively shape the wave of the PFC input current. In some embodiments, the on-time is corrected using a phase-lock-loop module that synchronizes with the rectified input line voltage signal and a output regulator module that corrects the switch on-time. The control may be implemented using a digital or an analog controller. | 01-30-2014 |
20140035474 | HIGH EFFICIENCY LED DRIVER CHIP AND DRIVER CIRCUIT THEREOF - Disclosed is a high-efficiency LED driver chip and a driver circuit of the chip, and the driver chip includes a detection unit, a comparison unit and a correction unit. The LED detection unit detects the operating current of the LED driver circuit by an external sensing resistor and an internal current mirror to output a setup signal, and the comparison unit detects the driving current of at least one LED by an external comparing resistor to output an initialization signal, so that the correction unit can output a correction signal according to the setup signal and the initialization signal to reduce the power loss of the circuit while maintaining the driving current constant, so as to improve the illumination quality and the service life of the LED. | 02-06-2014 |
20140035475 | CONTROLLER OF AN AC-DC CONVERTER FOR LED LIGHTING - The present invention relates to a controller of an AC-DC converter, which controls an LED lighting using electricity of AC 100V to 250V which is used in a building or home, and more particularly, to a controller of an AC-DC converter for LED lighting, which is capable of effectively controlling brightness of an LED lighting. | 02-06-2014 |
20140042921 | AC/DC CONVERTER CIRCUIT - There is disclosed an AC/DC converter circuit. The circuit comprises: an input terminal for receiving an AC supply voltage; a driver circuit adapted to supply a DC drive current or voltage to an output of the circuit based on a signal provided to a control terminal of the driver circuit; and an AC coupling network connected between the input terminal and the control terminal of the driver circuit. The AC coupling network is adapted to derive a signal from an AC supply voltage received by the input terminal and to supply the derived signal to the control terminal of the driver circuit. | 02-13-2014 |
20140049173 | LED CONTROLLER CIRCUIT - An LED controller circuit for use in an LED drive circuit in which a coil current control scheme is used to deliver power to an LED arrangement from a phase cut dimmer. The controller circuit includes means for determining, based on an analysis/signal processing of the on-time of the transistor, the dimmer characteristics, including the on state and off states of the ac dimmed voltage signal. This avoids the need for the controller circuit to process the dimmer output. | 02-20-2014 |
20140049174 | DRIVING DEVICE AND METHOD FOR DRIVING A LOAD, IN PARTICULAR AN LED ASSEMBLY - Driver device and a corresponding driving method for driving a load, in particular an LED assembly comprising one or more LEDs. To provide a better performance, better cost-efficiency, improved power factor and reduced losses, a driver device ( | 02-20-2014 |
20140055052 | Solid State Lightening Driver with Mixed Control of Power Switch - In order to control of dimming of solid state lighting devices (SSL) a driver circuit drives the SSL subject to an input voltage using a phase-cut dimmer. The driver circuit comprises a transistor operable in two modes, either alternating between on/off states or continuously controlling a current through the transistor. A power converter network provides a switched-mode power converter in conjunction with the transistor when operated in the first mode generating a drive voltage for the SSL. The control unit controls the transistor to selectively operate in one of the two modes; to control the transistor to determine that the input voltage exceeds an input voltage threshold; and to control a drive current through the SSL based on a measurement of a phase-cut angle thereby controlling an illumination level of the SSL device. | 02-27-2014 |
20140062322 | CONTROLLED-SILICON ADAPTING LED DRIVING CIRCUIT, METHOD AND SWITCH MODE POWER SUPPLY - Disclosed are light-emitting diode (LED) driver circuits, methods, and a switch mode power supply. In one embodiment, an LED driver can include: (i) a silicon-controlled rectifier (SCR) and a rectifier bridge configured to receive an AC voltage, and to generate a phase-loss half sine wave voltage signal; (ii) a threshold voltage control circuit configured to receive a threshold voltage and an input voltage signal that represents the phase-loss half sine wave voltage signal, and to determine whether to output the threshold voltage based on angle information of the input voltage signal; (iii) a first control circuit configured to compare the input voltage signal against the threshold voltage output by the threshold voltage control circuit, and to generate a first control signal; and (iv) a power switch controllable by the first control signal to be off until an absolute value of the AC voltage is reduced to zero. | 03-06-2014 |
20140062323 | Linear Light-Emitting Diode Driving Circuit with Voltage-Lowering Serial Capacitor - A linear light-emitting diode (LED) driving circuit with voltage-lowering serial capacitor has a rectification unit, an LED unit, a constant current controller, a series and parallel voltage divider and a controller. The controller is built in with a safe voltage threshold, controls the series and parallel voltage divider to be connected in series to the LED unit when an output voltage of the rectification unit exceeds the safe voltage threshold, ensuring that an average voltage across the LED unit and the constant current controller is stable, and controls the series and parallel voltage divider to be parallelly connected across the LED unit and the ground when the output voltage of the rectification unit does not exceed the safe voltage threshold. Accordingly, a safety standard of voltage for LED driving circuit can be secured and users' safety can be ensured. | 03-06-2014 |
20140077713 | LUMINAIRE - A luminaire according to one embodiment includes a DC power supply circuit, a switching power supply, and a lighting load. The DC power supply circuit converts an AC voltage controlled in phase to a DC voltage. The switching power supply is connected to the DC power supply circuit, and is controlled so that an input current becomes a constant current. The lighting load is connected as a load circuit of the switching power supply. | 03-20-2014 |
20140077714 | DRIVING DEVICE, LIGHT-EMITTING DEVICE AND PROJECTOR - A driving device includes a switching power supply circuit to convert input power to output power; a first switching element which opens and closes a circuit of a load; an output capacitor connected in parallel to the load and the first switching element; a selection switch disposed between the inductor and the output capacitor, the selection switch switching between a first selection state where the load is electrically connected to the inductor and the second selection state where a reference potential portion is electrically connected to the inductor; a timing controller which operates the switching power supply circuit while the first switching element is closed; and a controller which puts the selection switch into the second selection state before the first switching element is closed. | 03-20-2014 |
20140084798 | PFC LED DRIVER CAPABLE OF REDUCING FLICKER - A PFC LED driver capable of reducing flicker, including: a bridge rectifier, used to generate a full-wave-rectified line input voltage according to an AC power a single stage PFC constant average current converter, coupled with the bridge rectifier and used for forcing an input current to track the full-wave-rectified line input voltage and regulating an average value of an output current at a first preset value; and a peak current regulator, in series with an LED module to form a load for the output current to flow through, wherein the peak current regulator is used to regulate a peak of the output current at a second preset value, and the second preset value is higher than the first preset value. | 03-27-2014 |
20140084799 | LIGHT SOURCE DRIVING DEVICE AND ILLUMINATING APPARATUS USING THE SAME - A light source driving device includes a transformer, a rectifying diode, a filter, and an open loop preventing circuit. The transformer has a primary winding part including first and second external input terminals configured to receive external power from a ballast stabilizer and a coil having an impedance level set to allow the ballast stabilizer to output a normal amount of power, and a secondary winding part electromagnetically coupled to the primary winding part to transform received external power. The rectifying diode rectifies power from the secondary winding part, and the filter filters the rectified power from the rectifying diode. The open loop preventing circuit provides a closed loop to the filter such that power stored in the filter is applied to the output terminal when the rectifying diode is turned off. | 03-27-2014 |
20140084800 | DRIVING LIGHT EMITTING DIODE (LED) LAMPS USING POWER RECEIVED FROM BALLAST STABILIZERS - A circuit drives a light emitting diode (LED) lamp based on alternating current (AC) power received from a ballast stabilizer. The circuit includes an inductive load, a rectifying circuit, and an output circuit. The inductive load is coupled to and receives the AC power from the ballast stabilizer. The rectifying circuit is electrically coupled to the inductive load and rectifies the AC power to produce a unidirectional current. The output circuit receives the unidirectional current from the rectifying circuit, and produces an output current for driving the LED lamp. Various additional circuits and illuminating apparatuses for producing light from AC power using a LED lamp are also provided. | 03-27-2014 |
20140091723 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light source having an adjustable color temperature is provided. The driving circuit includes a power converter, coupled between a power source and the light source and operable for receiving power from the power source and for providing a regulated power to the light source; and a color temperature controller, coupled to the power converter and operable for receiving a switch monitoring signal indicative of an operation of a power switch coupled between the power source and the power converter, and for adjusting the color temperature of the light source based on the switch monitoring signal. | 04-03-2014 |
20140097764 | LIGHTING CIRCUIT AND LAMP - A lighting circuit ( | 04-10-2014 |
20140103826 | TWO-WIRE DIMMER SWITCH FOR LOW-POWER LOADS - A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive. | 04-17-2014 |
20140103827 | TWO-WIRE DIMMER SWITCH FOR LOW-POWER LOADS - A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive. | 04-17-2014 |
20140111104 | LIGHT-EMITTING DEVICE CIRCUIT AND METHOD OF OPERATING THEREOF - The light-emitting device disclosed herein comprises a step down circuit and a current limit device, wherein the step down circuit prevents the current signal provided to the light-emitting device larger than the rating current value of the light-emitting device. Moreover, the current limit device only limits current signal while the power supply surges. The two stages protect circuit turn less power to heat. | 04-24-2014 |
20140111105 | DIMMER CIRCUIT AND LIGHTING APPARATUS USING THE SAME - A dimmer circuit and a lighting apparatus using the same are provided. The dimmer circuit comprises a dimmer, a rectifier, a sample-and-hold unit, an integral unit and a current holding circuit. The dimmer is coupled to an AC for modulating the AC into an alternating signal. The rectifier couples the dimmer and the AC for rectifying the alternating signal into a DC signal. The sample-and-hold unit is coupled to the rectifier for sampling the DC signal to obtain an average positive wave pulse. The integral unit is coupled to the sample-and-hold unit for integrating the average positive wave pulse to generate a DC voltage. The current holding circuit comprises a switch and a bleeder. The current holding circuit determines the on/off state of the switch according to a comparison between the DC voltage and a reference voltage, such that the DC signal passes through the bleeder or the switch. | 04-24-2014 |
20140111106 | BALLAST WITH TEMPERATURE COMPENSATION - A ballast for driving a gas discharge lamp includes an inverter configured to generate a lamp supply voltage signal, and a voltage regulator coupled to the inverter and configured to generate a regulation signal. The regulation signal is used by the inverter to maintain the lamp voltage signal at a substantially constant voltage. A thermistor circuit is coupled between the lamp supply voltage signal and the voltage regulator and configured to detect a temperature of the ballast. The lamp supply voltage signal is varied by the regulation signal in accordance with the detected temperature of the ballast. | 04-24-2014 |
20140111107 | LED DRIVING APPARATUS HAVING HOLDING CURRENT CIRCUIT AND OPERATING METHOD THEREOF - A LED driving apparatus having a holding current circuit and an operating method thereof are disclosed. The holding current circuit includes an input terminal, a holding resistor, a regulator, a first resistor, a second resistor, a setup resistor, a control unit, and a transistor. The holding resistor and the regulator, the first resistor and the second resistor, and the transistor and the setup resistor are coupled between the input terminal and ground terminal respectively. The control unit is coupled to the transistor, between the holding resistor and the regulator, and between the first resistor and the second resistor respectively. The control unit receives a first voltage between the holding resistor and the regulator and a second voltage between the first resistor and the second resistor and outputs a control signal to selectively control the transistor off. | 04-24-2014 |
20140117865 | AC/DC POWER CONVERTER - In one embodiment, an AC/DC power converter can include: a rectifier bridge and a filter capacitor for converting an external AC voltage to a half-sinusoid DC input voltage; a first storage component, where during each switching cycle in a first operation mode, a first path receives the half-sinusoid DC input voltage to store energy in the first storage component, and a first current through the first storage component increases; a second storage component, where a second path receives a second DC voltage to store energy in the second storage component, and a second current through the second storage component increases; and a third storage component, where in a second operation mode, the first current decreases to release energy from the first to the third storage component, where the second DC voltage includes a voltage across the third storage component through a third path. | 05-01-2014 |
20140125239 | CIRCUITS AND METHODS FOR REDUCING FLICKER IN AN LED LIGHT SOURCE - Method and circuits for balancing a first waveform used to drive an LED are disclosed herein. The first waveform has a first cycle with a first amplitude and a second cycle with a second amplitude. An embodiment of the method includes adjusting the first amplitude of the first cycle to match the second amplitude of the second cycle, the result being a second waveform. The LED is driven with the second waveform. | 05-08-2014 |
20140125240 | Dimmable LED Driver And Method For Controlling The Same - A dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED driver comprises: a rectifier configured to convert an alternating current output by the dimmer to a direct current, a buck PFC block configured to adjust an output voltage of the direct current so as to obtain a stable output voltage, a second buck DC/DC block configured to realize output of a constant current after the stable output voltage is realized, a dimming block configured to, after realizing output of the constant current, accomplish a dimming function jointly with the second buck DC/DC block, and an MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block. | 05-08-2014 |
20140125241 | DC-DC DRIVER DEVICE HAVING INPUT AND OUTPUT FILTERS, FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT - The present invention relates to a driver device ( | 05-08-2014 |
20140132167 | FLORESCENT BALLAST TO DC POWER SYSTEM - A lighting element for use in a light fixture optionally utilizing a ballast. The lighting element includes a light emitting diode having a set of input pins on opposing ends of a housing. The input pins are configured to engage the light fixture. The lighting element also includes an electronic unit in communication with the light fixture to receive an alternating current. The electronic unit has a solid state core to convert alternating current to direct current. The electronic unit is configured to regulate power to the light emitting diode. The electronic unit is coupled to the light emitting diode within the housing between the input pins, acting as a singular structure. | 05-15-2014 |
20140132168 | Power Supply Device and Lighting Equipment Provided with Power Supply Device - A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal. | 05-15-2014 |
20140145633 | LIGHT-EMITTING DIODE PACKAGE AND METHOD OF FABRICATING THE SAME - A Light Emitting Diode (LED) package and a method of manufacturing the same. The LED package includes a substrate. The substrate defines therein a cavity having a tapered shape, a stepped portion formed on the upper end of the cavity, and a through hole formed in the bottom of the cavity. A conductive film fills the through-hole and is formed on the bottom and the side surfaces of the cavity. An LED has a fluorescent layer thereon, and is flip-chip bonded onto the conductive film. An encapsulant encapsulates the cavity. A Zener diode or a rectifier is provided on the silicon substrate. | 05-29-2014 |
20140152187 | CIRCUITS AND METHODS FOR DRIVING A LIGHT SOURCE - A circuit includes a bridge circuit, a converter, and a controller. The bridge circuit receives power from first and second power lines of a switch and generates a rectified voltage. The switch is capable of operating in a first state in which the switch conducts power to the first power line but not the second power line, a second state in which the switch conducts power to the second power line but not the first power line, and a third state in which the switch conducts power to both the first and second power lines. The converter converts the rectified voltage to an output voltage to drive a light source, and controls a current through the light source according to a driving signal. The controller monitors the operation state of the switch and generates the driving signal based on the operation state to control brightness/dimming of the light source. | 06-05-2014 |
20140159601 | POWER SUPPLY CIRCUIT AND ILLUMINATION DEVICE - There is provided a power supply circuit including a power converting unit, a control unit, and a power supply unit for control. The power converting unit converts a conduction angle controlled alternating-current voltage supplied via a power supply path so as to be supplied to a load. The control unit detects a conduction angle of the alternating-current voltage and controls conversion of a voltage by the power converting unit according to the detected conduction angle. The power supply unit for control is electrically connected to the power supply path and converts the alternating-current voltage so as to be supplied to the control unit. | 06-12-2014 |
20140159602 | POWER SUPPLY CIRCUIT AND LUMINAIRE - There is provided a power supply circuit including a power converting unit configured to convert a conduction angle controlled alternating-current voltage supplied via a power supply path and supply a direct-current voltage to a load, a control unit configured to detect a conduction angle of the alternating-current voltage and control the conversion of the voltage according to the detected conduction angle, and a power supply unit including a first branch path electrically connected to the power supply path, a semiconductor element configured to adjust an electric current flowing to the first branch path, a thermosensor configured to limit, if the temperature of the semiconductor element is equal to or higher than an upper limit temperature, an electric current flowing to the semiconductor element. The power supply unit converts the alternating-current voltage input via the first branch path and supplies a direct-current voltage to the control unit. | 06-12-2014 |
20140159603 | LED DRIVING APPARATUS AND METHOD - There are provided an LED driving apparatus and an LED driving method. The LED driving apparatus includes a rectifying unit rectifying AC power; a light emitting unit including a plurality of light emitting diodes; a switching unit including a plurality of switching elements connected to the plurality of light emitting diodes; and a controlling unit controlling operations of the plurality of light emitting diodes, wherein the controlling unit controls a duty ratio of a turned-on switching element based on a level of the AC power within respective turning-on periods of the plurality of switching elements. | 06-12-2014 |
20140159604 | Power Supply Circuit and Luminaire - A power supply circuit includes a power converting unit, a current adjusting unit, and a control unit. The power converting unit is configured to convert an alternating-current voltage into a direct-current voltage and supply the direct-current voltage to a load. The alternating-current voltage is subjected to conduction angle control and is supplied via a power supply path. The current adjusting unit includes a branch path electrically connected to the power supply path and can switch a first path state and a second path state. The first path state feeds a part of an electric current flowing through the power supply path to the branch path. The control unit detects a conduction angle of the alternating-current voltage, controls the conversion of the direct-current voltage by the power converting unit according to the detected conduction angle, and controls the current adjusting unit according to the detected conduction angle. | 06-12-2014 |
20140159605 | AC-DC POWER CONVERTER - In one embodiment, an AC-DC power converter can include: (i) a rectifier bridge and filter to convert an external AC voltage to a DC input voltage; (ii) a first energy storage element to store energy from the DC input voltage via a first current through a first conductive path when in a first operation mode; (iii) a second energy storage element configured to store energy from a second DC voltage via a second current through a second conductive path when in the first operation mode; (iv) a transistor configured to share the first and second conductive paths; (v) the first energy storage element releasing energy to a third energy storage element and a load through a third conductive path when in a second operation mode; and (vi) the second energy storage element releasing energy to the load through a fourth conductive path during the second operation mode. | 06-12-2014 |
20140159606 | Energy-Recycling Burn-In Apparatus and Method of Burn-In for Electronic Ballasts - An apparatus and method for burning-in an electronic ballast for a lamp. The apparatus comprises a first stage for emulating an input impedance characteristic of a lamp for the electronic ballast and a second stage connected to the first stage for providing energy feedback to a power supply. An input of the first stage connects in use to the electronic ballast to be burnt-in. An output of the second stage connects in use to the power supply to provide energy feedback to said power supply from the electronic ballast being burnt-in. The energy-recyclable burn-in apparatus can emulate the lamp characteristics from start up to the steady state, process high-frequency ballast output power and recycle the power back into the power grid. The burn-in method includes operating the apparatus for a predetermined period of time such that a voltage applied to the electronic ballast simulates a steady-state operation of a lamp for the electronic ballast. | 06-12-2014 |
20140175997 | ADAPTIVE LIGHT EMITTING DIODE DIMMING DRIVING CIRCUIT - An adaptive LED dimming driving circuit is disclosed, wherein its control module is disposed with a first resistor, a second resistor, a retainer, a third resistor and a fourth resistor. When the control module receives an input voltage, the retainer is driven to output a retaining current I | 06-26-2014 |
20140191679 | DIMMING CIRCUIT AND LIGHTING DEVICE USING THE SAME - A dimming circuit and a lighting device using the same are provided. The dimming circuit comprises an interface trigger unit, an average duty cycle calculating unit, a control voltage calculating unit and a comparing unit. The interface trigger unit receives an on-time of each pulse width from each period in a PWM signal. The average duty cycle calculating unit is coupled to the interface trigger unit and calculates a ratio of the on-time to the period. The control voltage calculating unit is coupled to the average duty cycle calculating unit, and calculates a desired voltage according to the ratio. The comparing unit is coupled to the control voltage calculating unit, and sends the desired voltage and a differential voltage to a driving circuit. | 07-10-2014 |
20140197753 | Switching Power Source and Lighting Device - A switching power source includes first and second inductors, a switching element, current control element, rectifier element, and control circuit. The switching element supplies a power source voltage to the first inductor. The current control element detects a current flowing in the switching element and has first and second main terminals, and a control terminal, with the second main terminal connected to the switching element. The control circuit turns off the current control element and interrupts the current flowing in the switching element when a voltage between the second main terminal and the first main terminal of the current control element is equal to or higher than a specified value. The rectifier circuit is series-connected to one of the switching element and the current control element. The second inductor is magnetically coupled to the first inductor, in which a potential turning on and off the switching element can be induced. | 07-17-2014 |
20140232279 | SUPPLEMENTAL LOAD CIRCUIT FOR LOW POWER TRAFFIC LAMPS - The present disclosure provides a supplemental load circuit configured to provide a supplemental power consumption to enable a lamp unit operating at a low power consumption to operate with a traffic controller configured to test for a higher power consumption. The supplemental load circuit includes a load, power input circuitry configured to receive a DC power signal from the lamp unit, and a control switch configured to receive a control signal having a duty cycle from the lamp unit. The control switch is configured to control application of the DC power signal to the load by the power input circuitry based on the duty cycle of the control signal. The present disclosure also provides a method for enabling a lamp unit to operate with a traffic controller designed for higher power lamp units. | 08-21-2014 |
20140232280 | Rectifying Circuit and Power Supply Circuit - According to one embodiment, a rectifying circuit includes a diode, a switching element, a capacitor and an auxiliary winding. The diode is connected between a first terminal and a second terminal while a direction directed from the second terminal to the first terminal is a forward direction. The switching element includes a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the diode, and a gate electrode connected to an anode of the diode. The auxiliary winding is magnetically coupled to an inductor. The auxiliary winding is connected to the gate electrode through the capacitor, and is connected to the second main electrode of the switching element and the cathode of the diode. | 08-21-2014 |
20140232281 | Rectifier Circuit and Power Source Circuit - According to an embodiment, a rectifier circuit includes a first diode, a switching element, and a second diode. The first diode is connected between a first terminal and a second terminal so that a direction toward the first terminal from the second terminal is in a forward direction. The switching element has a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the first diode, and a gate electrode connected to an anode of the first diode. The second diode is connected in parallel with respect to the switching element so that a direction toward the first terminal from the cathode of the first diode is in a forward direction, between the first main electrode and the second main electrode of the switching element. | 08-21-2014 |
20140232282 | RESONANT CONVERTER - Consistent with an example embodiment, a resonant converter comprises a signalling transformer that is used to transfer information between the secondary winding and primary winding of the converter whilst maintaining mains isolation between the two sides. In the embodiment, according to the disclosure, the use of a signalling transformer (in addition to a switching, or resonant, transformer) eliminates the need for an opto-coupler to transfer information and so allows for the construction of a simpler, more reliable and/or cheaper resonant converter. Other embodiments described herein may be suitable for use in dimmable LED driver applications, for example. | 08-21-2014 |
20140239829 | LED DRIVER - The present application discloses a LED driver including: a first and a second auxiliary windings connected in series with each other; a first rectifying device coupled with a terminal of the first auxiliary winding while the other terminal is coupled with the second auxiliary winding; a second rectifying device coupled with a terminal of the second auxiliary winding; a first voltage regulator coupled with the first rectifying device; an unidirectional conducting device having a positive and a negative terminals; and a DC output terminal coupled with the negative terminal of the unidirectional conducting device and configured to provide required DC electricity to a control circuit in the LED driver. The LED driver can guarantee that Vcc voltages provided under a heavy or light load state can always meet the DC power supplying requirements of respective control devices in the driver and meanwhile losses can be reduced. | 08-28-2014 |
20140239830 | LED CURRENT CONTROL APPARATUS - According to an embodiment, an LED current control apparatus controls conduction of a switching transistor which is connected to a primary winding of a flyback convertor. The LED current control apparatus includes a pseudo sine wave generation unit, a synchronous control unit, a first comparator, a switch control unit, a crest value correction unit, and a pulse monitor control unit. | 08-28-2014 |
20140239831 | SEMICONDUCTOR DEVICE AND POWER SUPPLY DEVICE - A power supply topology is used in which a transistor is provided on the side of an output node of a rectifying circuit. An inductor is provided on the side of a reference node, a resistor is inserted between the transistor and the inductor, and one end of the resistor is coupled to a ground power supply voltage of a PFC circuit. The PFC circuit includes a square circuit which squares a result of multiplication of an input voltage detection signal and feedback information (output voltage of an error amplifier circuit). The PFC circuit drives on the transistor when a detection voltage developed at the resistor reaches zero, and drives off the transistor when the detection signal reaches an output signal of the square circuit. | 08-28-2014 |
20140246985 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver, and driving methods thereof. In one embodiment, a high efficiency LED driving method can include: (i) receiving an AC input voltage to obtain an absolute value thereof; (ii) receiving a DC bus voltage, and driving the LED device through a power switch; (iii) generating a first reference voltage according to a driving current and an expected driving current; (iv) comparing the absolute value against a sum of a driving voltage and the first reference voltage; (v) when the absolute value is greater than the sum of the driving voltage and the first reference voltage, turning off the power switch; and (vi) when the absolute value is greater than the driving voltage but less than the sum of the driving voltage and the first reference voltage, turning on the power switch to generate an output current. | 09-04-2014 |
20140252969 | PFC LED DRIVER HAVING A FLICKER CONTROL MECHANISM - A PFC LED driver having a flicker control mechanism, including: a bridge rectifier, used to generate a full-wave-rectified line input voltage according to an AC power; a single stage PFC constant average current converter, coupled with the bridge rectifier and used for forcing an input current to track the full-wave-rectified line input voltage and regulating an average value of an output current at a first preset value; and a current ripple reducing unit, in series with an LED module to form a load for the output current to flow through, wherein the current ripple reducing unit has a negative feedback control mechanism for forcing a peak of the output current approach an average value of the output current. | 09-11-2014 |
20140252970 | DYNAMIC STEP DIMMING INTERFACE - A dynamic step dimming interface is provided that allows a ballast to energize a lamp in a dim mode or a normal mode. The ballast includes a lamp controller that energizes the lamp using an oscillating current. The oscillating current is also provided to a voltage monitor, which indicates the voltage level of the oscillating current, and to a rectifier, which provides an output indicative of the oscillating current. The rectifier is responsive to user input indicating whether the dim mode or the normal mode is to be used. A processing circuit receives the voltage level from the voltage monitor and provides a mode command to the ballast, indicating the lamp mode, based on inputs received, and provides a reference voltage to a comparator. The comparator receives the rectifier output and the reference voltage, and generates a voltage indicative of a power level of the lamp for the processing circuit. | 09-11-2014 |
20140252971 | Method of Manufacturing a Semiconductor Device - The present invention supplies a manufacturing method of a semiconductor device, which includes a non-contact inspection process capable of confirming if a circuit or circuit element formed on an array substrate is normally performed and can decrease a manufacturing cost by eliminating wastes to keep a defective product forming. | 09-11-2014 |
20140252972 | LED LIGHT SOURCE WITH REDUCED FLICKER - An illumination control system includes a rectifying device, a damping device for inhibiting flickering, and a load circuit, wherein the illumination control system further comprises a recognizing control circuit connected between the rectifying device and the damping device, and wherein the recognizing control circuit includes a recognizing signal output module and a switch module, the recognizing signal output module generates a first control signal indicating that a dimmer is not connected upstream the rectifying device or the dimmer is connected upstream the rectifying device and reaches a predetermined dimming level and a second control signal indicating that the dimmer is connected upstream the rectifying device and does not reach the predetermined dimming level and at least one damping resistor of the damping device is short connected or is connected by means of the switch module according to the first control signal or the second control signal. | 09-11-2014 |
20140252973 | Ripple Cancellation Converter with High Power Factor - Provided are circuits and methods for use with a power supply that provides a main output including a main DC voltage having a first AC voltage ripple, or a main DC current having a first AC current ripple. A ripple cancellation converter provides a second AC voltage ripple connected in series with the main output, such that the first AC voltage ripple is substantially cancelled; or a second AC current ripple connected in parallel with the main output, such that the first AC current ripple is substantially cancelled. As a result, substantially ripple-free DC output power is provided. | 09-11-2014 |
20140265895 | Damping Resonance In A Converter Including A Coupling Capacitor - A converter circuit includes an input filter including an input capacitor configured to filter electromagnetic interference from an input voltage. The converter circuit includes an output capacitor, a first inductor coupled to the input capacitor, a switch coupled to the first inductor and configured to control a level of current flowing in the first inductor, a coupling capacitor connected to the first inductor, and an output rectifier coupled between the coupling capacitor and the output capacitor. A damping circuit that is configured to damp a resonant frequency of the converter circuit is coupled in parallel with the coupling capacitor. | 09-18-2014 |
20140265896 | LIGHT DRIVER CONTROL SYSTEM - A system for controlling a light source includes a control circuit to be coupled to an ac source to receive an ac signal. The control circuit includes an input controller coupled to receive an input control signal and dimming command circuitry coupled to the input controller and coupled to receive the ac signal. The dimming command circuitry is coupled to remove one or more portions of a predetermined duration from the ac signal followed by a substantially full ac signal in response to the input control signal. A lighting driver circuit is to be coupled to a light source and coupled to receive the ac signal from the control circuit. The lighting driver circuit is coupled to drive the light source to have a light output adjusted in response to the removed one or more portions of the predetermined duration from the ac signal by the dimming command circuitry. | 09-18-2014 |
20140265897 | CHARGING AN INPUT CAPACITOR OF A LOAD CONTROL DEVICE - A load control device for controlling the amount of power delivered to an electrical load may include a rectifier circuit configured to receive a phase-control voltage and produce a rectified voltage. A power converter may be configured to receive the rectified voltage at an input and generate a bus voltage. An input capacitor may be coupled across the input of the power converter. The input capacitor may be adapted to charge when the magnitude of the phase control voltage is approximately zero volts. The power converter may be configured to operate in a boost mode, such that the magnitude of the bus voltage is greater than a peak magnitude of the input voltage. The power converter may be configured to operate in a buck mode to charge the input capacitor from the bus voltage when the magnitude of the phase-control voltage is approximately zero volts. | 09-18-2014 |
20140265898 | LOSSLESS PRELOAD FOR LED DRIVER WITH EXTENDED DIMMING - A quasi-phase active preload circuit to be coupled at the output of a non-isolated LED driver converter having a pre-stage phase-angle control dimmer circuit, such as a commonly used leading-edge control Triac dimmer, is disclosed. The quasi-phase active preload circuit may include a preload resistor coupled to a current-controlled current source configured to draw a sinking current through the preload resistor based on a peak detect signal. The peak detect signal may be, in one example, representative of a leading-edge peak voltage of an output of the Triac dimmer circuit, which may be representative of a conduction angle of the Triac dimmer circuit. During normal operating conditions, no sinking current is drawn through the preload resistor. During low dimming conditions, a sinking current that is responsive to the peak detect signal is drawn through the preload resistor. During deep dimming or when used with a leaky Triac dimmer, a maximum sinking current may be drawn through the preload resistor by the current-controlled current source. | 09-18-2014 |
20140265899 | Linear LED Driver - A linear driver circuit includes an AC input, a rectifier connected to the AC input, a linear power supply connected to the rectifier, a load output connected to the linear power supply, a current detector connected to the load output, and a controller connected to the current detector and to the linear power supply. | 09-18-2014 |
20140265900 | Fluorescent Lamp LED Replacement - An apparatus for supplying power includes a power input configured to receive electrical current from a fluorescent lamp fixture ballast, a rectifier connected to the power input, a constant current driver connected to an output of the rectifier, and a power output. | 09-18-2014 |
20140265901 | DRIVER FOR CONNECTING LED TO ELECTRONIC BALLAST - To allow an electronic ballast ( | 09-18-2014 |
20140285099 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, there is provided a power supply circuit including a power conversion unit, a current regulator, a controller, and a controller power supply. The power conversion unit converts an AC voltage with a controlled conduction angle into a different voltage. The current regulator includes a branch path electrically connected to the power supply path and switches between a first state in which a part of a current flowing through the power supply path flows to the branch path and a second state in which a current flowing to the branch path is lower than that of the first state. The controller switches the current regulator to the second state in at least a part of a conduction period of a detected conduction angle and switches the current regulator to the first state in a blocking period of the detected conduction angle. | 09-25-2014 |
20140285100 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, provided is a power supply circuit including a power conversion unit, a controller, and an integrated circuit. The power conversion unit converts an AC voltage into a different voltage. The integrated circuit includes a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to an input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state, a controller power supply that converts a voltage into a driving voltage and supplies the driving voltage to the controller, a connection terminal for connecting an auxiliary power supply used for generating the driving voltage, and a protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal. | 09-25-2014 |
20140285101 | Lighting Power Source and Lighting Device - According to one embodiment, a lighting light source including a current control element and a voltage-dividing resistor is provided. The current control element has a first main electrode, a second main electrode series-connected with respect to a lighting light source, and a first control electrode for controlling a current flowing between the first main electrode and the second main electrode, and controls a current supplied to the lighting light source. The voltage-dividing resistor is parallel-connected with respect to the lighting light source and connected to the first control electrode, and inputs a voltage obtained by division of a voltage of the lighting light source to the first control electrode. | 09-25-2014 |
20140300288 | LIGHT EMITTING DEVICE POWER SUPPLY CIRCUIT AND DAMPING CIRCUIT THEREIN AND DRIVING METHOD THEREOF - The present invention discloses a light emitting device power supply circuit and a damping circuit therein and a driving method thereof. The light emitting device power supply circuit includes: a tri-electrode AC switch (TRIAC) dimming circuit, a rectifier circuit, a light emitting device driver circuit, and a damping circuit. The damping circuit includes: an impedance circuit, which is electrically connected between the rectifier circuit and the light emitting device driver circuit; a silicon control rectifier (SCR) circuit, which is connected to the impedance circuit in parallel; and a delay circuit, which is coupled to the SCR circuit, for turning ON the SCR circuit after a delay time period from when the TRIAC diming circuit begins to start-up, wherein the delay circuit does not directly receive a full scale of the input voltage. | 10-09-2014 |
20140312794 | THREE-WAY OMNI-DIRECTIONAL LED LAMP DRIVER CIRCUIT - An LED driver circuit has a rectifier circuit including a first input terminal coupled to a first AC voltage line and a second input terminal coupled to a second AC voltage line. The rectifier circuit is configured to convert a first AC voltage on the first AC voltage line and a second AC voltage on the second AC voltage line to a DC voltage. The driver circuit has a switching circuit coupled to the first AC voltage line and to the second AC voltage line and configured to generate a reference AC voltage based on the first AC voltage and the second AC voltage. The driver circuit has a power management circuit configured to provide a current or power to an LED lamp based on the generated AC reference voltage. The driver circuit has a power supply circuit configured to provide a constant current or power to the power management circuit. | 10-23-2014 |
20140312795 | Driver device and driving method for driving a load, in particular an led unit - The present invention relates to a driver device ( | 10-23-2014 |
20140320033 | DIMMABLE SCREW-IN COMPACT FLUORESCENT LAMP HAVING INTEGRAL ELECTRONIC BALLAST CIRCUIT - A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit generates a lamp current through the lamp tube having a substantially constant envelope such that flicker in the lamp tube and electromagnetic interference (EMI) noise on an AC voltage supply are minimized. The dimmable ballast circuit comprises a high speed control circuit characterized by a cutoff frequency much greater than a frequency of a voltage ripple on a bus voltage of the ballast circuit. The dimmable ballast circuit may also comprise a non-linear amplifier circuit amplifying a lamp-current-feedback signal representative of the magnitude of the lamp current through the lamp. | 10-30-2014 |
20140327366 | ILLUMINATION DEVICE AND LED DIMMING CIRCUIT THEREOF - An illumination device includes a light-emitting diode (LED) lamp and a LED dimming circuit. The LED dimming circuit includes a power converting module, a sensing unit and a dimming module. The power converting module is used to generate a driving voltage to drive the LED lamp. The sensing unit is used to generate a sensing voltage signal. The dimming module includes an input interface, a dimming signal generator and an isolating unit. The input interface is used to receive a dimming control signal. The dimming signal generator is used to output a first feedback signal based on the sensing voltage signal and the dimming control signal. The isolating unit is used to receive the first feedback signal and output a second feedback signal to the power converting module so as to control a driving current. | 11-06-2014 |
20140327367 | CONTROL CIRCUIT OF LIGHT EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit which full-wave rectifies an alternating current power supply, a clock generator which generates and outputs a clock signal (CLK), a first comparator which compares a comparison voltage (CS) corresponding to a current flowing to the light-emitting element and a reference voltage (REF), and a switching element which is set to an ON state in synchronization with the clock signal (CLK) and which is set to an OFF state when the comparison voltage (CS) becomes greater than the reference voltage (REF) at the first comparator, to switch the current flowing to the light-emitting element. In this structure, a period of the clock signal (CLK) generated in the clock generator is varied, to reduce or inhibit noise. | 11-06-2014 |
20140333221 | LED LIGHT UNIT AND METHOD OF OPERATING AN LED LIGHT UNIT - An LED light unit, in particular for a passenger transport vehicle, such as an aircraft, a road vehicle, a ship or a rail car, is disclosed that has at least one LED and is configured to be used with a high intensity discharge lamp power supply that is adapted to monitor its output behavior. The LED light unit comprises a power input coupleable to the high intensity discharge lamp power supply, a capacitor switchably coupled to the power input for absorbing electrical energy from the high intensity discharge lamp power supply, and a power dissipating element switchably coupled to the power input for dissipating electrical energy from the high intensity discharge lamp power supply. | 11-13-2014 |
20140339995 | SINGLE PIN CONTROL OF BIPOLAR JUNCTION TRANSISTOR (BJT)-BASED POWER STAGE - A power stage for light emitting diode (LED)-based light bulbs may include a bipolar junction transistor (BJT). The base of BJT switch may be biased externally and the operation of the BJT may be through a single pin to the emitter of the BJT. A controller integrated circuit (IC) may control the power stage through the main BJT's emitter pin in an emitter-controlled BJT-based power stage. The emitter-controlled BJT-based power stage may replace the conventional buck-boost power stage topology. For example, the controller may activate and deactivate a switch coupling the BJT's emitter to ground. A power supply for the controller IC may be charged from a reverse recovery of charge from the BJT, and the reverse recovery controlled by the controller IC. | 11-20-2014 |
20140346963 | LIGHT SOURCE DRIVING APPARATUS AND LIGHT SOURCE SYSTEM - A light source driving apparatus includes a triac configured to control a phase of an output voltage, a diac connected to a gate of the triac and configured to apply a trigger signal, a voltage charger configured to provide a breakover voltage to the diac, a variable resistor unit configured to determine a point in time at which the voltage charger provides a breakover voltage, and a variable impedance unit connected to both ends of the triac. The variable impedance unit includes a capacitor and an inductor, and is configured to vary impedance of the variable impedance unit. | 11-27-2014 |
20140346964 | APPLICATION CIRCUIT AND CONTROL METHOD THEREOF - An application circuit includes a dynamic load circuit and a control circuit. The dynamic load circuit is electrically connected to a light source. The control circuit is electrically connected to the dynamic load circuit and a TRIAC. The control circuit controls the load status of the dynamic load circuit based on output current from the TRIAC, so as to turn on the light source. | 11-27-2014 |
20140346965 | OPERATING DEVICE WITH POWER FACTOR CORRECTION AND RIPPLE LIMITATION BY CHANGE IN OPERATION - Operating device (A) for a luminous means, the operating device having at least one driver circuit for operating at least one luminous means (Last), an energy store (Cbulk) which supplies the driver circuit, a power factor correction circuit which is in the form of a boost converter, supplies the energy store (Cbulk) and has a storage inductor (Lb), an actively clocked switch (S) and a rectifier diode (D), wherein the storage inductor (Lb) has a secondary winding which is arranged in such a manner that said winding is magnetically coupled to the primary winding of the storage inductor (Lb) and is connected in series with a coupling capacitor. | 11-27-2014 |
20140354165 | LED LIGHT SOURCE - Dimmable LED light source comprising: —a rectifier having rectifier input terminals for connection to respective output terminals of a phase cut dimmer of the trailing edge type, input terminals of the phase cut dimmer being connected to the mains supply, and having a first rectifier output terminal and a second rectifier output terminal, —a bleeder circuit connecting the rectifier output terminals, —a series arrangement comprising a first unidirectional element and first capacitive means connecting the rectifier output terminals, —a converter circuit, having input terminals coupled to respective sides of the first capacitive means and output terminals coupled to a LED load, for generating a current through the LED load, in dependence on a dim signal, out of a voltage present across the capacitive means, —a dim circuit for generating a dim signal as a function of the adjusted phase angle of the phase cut dimmer and for supplying the dim signal to a dim input of the converter circuit, —a series arrangement comprising a switching element and second capacitive means coupled between a terminal between the first unidirectional element and the second output terminal of the rectifier, —a control circuit for controlling the switching element in the conductive state when the voltage between the first and second output terminals of the rectifier drops below a first predetermined reference and for controlling the switching element in the non-conductive state when the voltage across the second capacitive means has reached a second predetermined reference, wherein the first capacitive means is dimensioned so that the voltage between the first and the second output terminal of the rectifier equals the sum of the voltage across the first capacitive means and the voltage across the first unidirectional means if the switching element is non-conductive. | 12-04-2014 |
20140361699 | LED CONTROL CIRCUITS AND METHODS - An LED controller is disclosed herein. An embodiment of the controller includes a first input connectable to a power source and an output connectable to at least one light-emitting diode (LED). A power factor correction circuit is coupled between the first input and the output, wherein the power factor correction circuit operates in a first state when the power factor is corrected and wherein the power factor correction circuit operates in a second state when the power factor is not corrected. The power factor correction circuit is in the first state when no dimming of the LED is sensed, and the power factor correction circuit is in the second state when dimming of the LED is sensed. | 12-11-2014 |
20140361700 | POWER SUPPLY FOR A FIELD EMISSION LIGHT SOURCE - The present invention relates to a power supply for a field emission light source. The novel power supply allows for a reduction in size as well as allowing for improvements relating to power factor and efficiency. The size reduction further allows the power supply to efficiently be integrated together with the field emission light source forming a lighting device. | 12-11-2014 |
20140361701 | SECONDARY SIDE PHASE-CUT DIMMING ANGLE DETECTION - Phase angle detection techniques for phase-cut dimming lighting circuitry are disclosed. A phase-cut lighting driver circuit may include galvanic isolation circuitry having a primary and secondary side. The phase angle information of a phase-cut signal may be detected on the secondary side of the driver circuitry, and a microcontroller can create a dimming signal that adjusts the driver output power according to the phase angle information. In some embodiments, the phase angle detection techniques may be utilized to control the output of lighting driver circuitry, such as a phase-cut dimming LED driver. | 12-11-2014 |
20140361702 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver and driving method thereof. In one embodiment, a high efficiency LED driving method configured for a LED device can include: (i) receiving a DC bus voltage and generating a driving voltage for the LED device through a power switch; (ii) comparing the DC bus voltage against a sum of the driving voltage and a first reference voltage; (iii) where when the DC bus voltage is greater than the sum of the driving voltage and the first reference voltage, generating a first output current; (iv) where when the DC bus voltage is greater than the driving voltage and less than the sum of the driving voltage and the first reference voltage, generating a second output current; and (v) matching an average current of the first output current and the second output current with a corresponding driving current. | 12-11-2014 |
20140368119 | LIGHT EMITTING DIODE LIGHTING APPARATUS AND DRIVING METHOD THEREOF - There is provide a light emitting diode lighting apparatus capable of being generally used in various kinds of dimmer, the apparatus including: a dimmer varying waveforms of input power according to a dimming signal; a bleeder adjusting a bleeding current under control; a controller comparing a latching current of the dimmer with the bleeding current of the bleeder to control the amount of the bleeding current; and an LED driver receiving a current other than the bleeding current flowing through the bleeder from among the currents from the dimmer to driver a light emitting diode (LED). | 12-18-2014 |
20140375225 | VCC Charge and Free-Wheeling Detection Via Source Controlled MOS Transistor - A driver circuit using a power converter allows free-wheeling detection and/or provision of supply voltage. A circuit controls a switching state of a power switch. A first port of the switch is coupled to an inductor. The circuit is coupled to a control port of the switch wherein the control port of the switch is different from the first port of the switch. The circuit comprises a unit generating a signal for controlling the switching state of the switch wherein the signal is provided to the control port of the switch. Furthermore, the circuit comprises free-wheeling sensing means to detect an oscillation of a voltage at a measurement port of the switch wherein the measurement port of the switch is different from the first port of the switch and wherein the oscillation of the voltage at the measurement port indicates free-wheeling of the inductor. | 12-25-2014 |
20150015150 | LIGHT EMITTING DIODE (LED) LAMP REPLACEMENT DRIVER FOR LINEAR FLUORESCENT LAMPS - Provided is a driver circuit including an input port configured for coupling to a ballast and a transformer having a first side coupled to the input port. The driver circuit also includes a rectifier having an input portion coupled to a second side of the transformer and an output portion configured for coupling to a light source. The transformer is configured to match output characteristics of the ballast to input characteristics of the light source. | 01-15-2015 |
20150015151 | Lighting Circuit and Luminaire - A lighting circuit include a connecting section connected to a light source module to thereby form at least a first path and a second path, a power supplying section connected to the connecting section and capable of supplying first direct-current power and second direct-current power to the light source module, a detecting section configured to detect the connection of the light source module, and a control section configured to determine, when the detecting section detects the connection of the light source module, whether the light source module is connected to the first path or the second path and, when determining that the light source module is connected to the first path, cause the power supplying section to supply the first direct-current power and, when determining that the light source module is connected to the second path, cause the power supplying section to supply the second direct-current power. | 01-15-2015 |
20150015152 | LIGHTING DRIVER AND HOUSING HAVING INTERNAL ELECTROMAGNETIC SHIELDING LAYER CONFIGURED FOR DIRECT CONNECTION TO CIRCUIT GROUND - An apparatus ( | 01-15-2015 |
20150015153 | CIRCUIT AND METHOD FOR DRIVING LED LAMP WITH A DIMMER - A driver circuit for an LED (light-emitting diode) lamp includes a transformer having a primary winding and a secondary winding, a dimmer circuit coupled to a power source for varying an input voltage to the primary winding, and an output rectifying circuit coupled to the secondary winding for providing an output current to the LED lamp. The driver circuit also includes a controller coupled to the dimmer circuit to receive an average input voltage signal (DIM) from the dimmer circuit. The controller is configured to vary the output current according to the average input voltage. | 01-15-2015 |
20150022105 | Method and Apparatus for Extending the Power Output Range of a Power Converter Used for a Lighting System - A method and system for extending the power output range of a power converter used for a lighting system is disclosed. | 01-22-2015 |
20150022106 | LIGHT-EMITTING DIODE DRIVING APPARATUS AND LIGHT-EMITTING DIODE ILLUMINATION SYSTEM USING THE SAME - A LED driving apparatus and a LED illumination system using the same are provided. The LED driving apparatus adapted to drive a LED load having at least one power specification includes a driving circuit, an output detecting circuit and an output adjusting circuit. The driving circuit provides an adjustable output current for driving the LED load. The output detecting circuit is coupled to the driving circuit and the LED load for detecting a driving voltage of the LED load to generate a first detecting signal. The driving circuit drives the LED load under a constant current in response to the first detecting signal. The output adjusting circuit is coupled to the output detecting circuit. The output adjusting circuit is controlled to adjust a signal level of the first detecting signal, such that the adjustable output current has at least one current adjusting range. | 01-22-2015 |
20150022107 | Driver device and driving method for driving a load, in particular a LED unit - The present invention relates to a driver device ( | 01-22-2015 |
20150022108 | LED LIGHT SOURCE - The invention relates to a dimmable LED light source comprising:—a rectifier having rectifier input terminals for connection to respective output terminals of a phase cut dimmer of the trailing edge type, input terminals of the phase cut dimmer being connected to the mains supply, and having rectifier output terminals,—a first bleeder circuit connecting the rectifier output terminals,—a series arrangement comprising a unidirectional element and a capacitive means connecting the rectifier output terminals,—a converter circuit, having input terminals coupled to respective sides of the capacitive means and output terminals coupled to a LED load, for generating a current through the LED load, in dependence on a dim signal, out of a voltage present across the capacitive means,—a dim circuit for generating a dim signal as a function of the adjusted phase angle of the phase cut dimmer and for supplying the dim signal to a dim input of the converter circuit, the dim circuit comprising:—gradient detection circuitry for determining the gradient of the voltage across the capacitive means and for determining as the adjusted phase angle the first value of the phase angle for which the gradient is negative, when the phase angle is less than 90 degrees,—signal generating circuitry for generating a sinusoidal signal that represents the mains supply voltage,—circuitry for activating the first bleeder when the phase angle is 90 degrees and for switching off the first bleeder when the adjusted phase angle has been determined, in case the adjusted phase angle is higher than 90 degrees,—deviation detection circuitry for detecting the deviation of the voltage across the rectifier output terminals from the sinusoidal signal, for comparing the deviation voltage with a reference voltage and for determining as the adjusted phase angle the value of the phase angle for which the deviation voltage is higher than or equal to the reference voltage, when the phase angle is between 90 and 180 degrees. | 01-22-2015 |
20150022109 | DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES - A driving circuit includes a power converter, a dimming controller and a current path coupled to the dimming controller. The power converter receives input power from a rectifier and provides output power to a light source. A power switch transfers power from an AC power source to the rectifier when the power switch is on. The dimming controller receives a switch monitoring signal indicative of the state of the power switch. An average current flowing through the light source has a first value if the power switch is on. The dimming controller is operable for adjusting the average current based on the switch monitoring signal. A current flows from the AC power source through the current path to ground when the power switch is off. | 01-22-2015 |
20150028757 | SINGLE WIRE LIGHTING DRIVER CONTROL - In embodiments of the present invention, there is provided a lighting control device connected in series with an AC supply line of a lighting driver at a control access point, wherein the lighting control device comprises an AC/DC converter configured to receive an input AC voltage from the AC supply line and to convert it to an output DC voltage. The lighting control device further comprises a lighting control circuit configured to use the output DC voltage as a power supply and to transmit control information to the driving unit. | 01-29-2015 |
20150028758 | ISOLATING MINIMAL SWITCHED POWER SUPPLY - Conventional linear or switched power supplies do not sufficiently meet increased requirements for the lowest possible standby losses in idle current mode or ready mode, or for maintaining the charge in storage capacitors or rechargeable batteries even when said supplies have significantly increased circuit complexity. The proposed schematic diagram provides a solution which, in comparison to prior art, can produce a large-scale reduction in said standby losses using a breakover voltage diode, such as e.g. DIAC, SIDAC, TRISIL, or a glow lamp, which, once the respective breakover voltage or triggering voltage has been reached, repeatedly discharges a high-voltage charging capacitor via the primary winding of a pulse transformer, said capacitor in limiting the alternating current with zero-loss and being continuously re-charged by means of a high-voltage input charging capacitor in the surge and ebb supply voltage phases. The pulse bursts of the pulse transformer are rectified on the secondary side and smoothed by means of a buffer capacitor. As the output voltage is clearly dependent on a variable load impedance, a linear fixed voltage regulator with minimal power losses can be connected downstream to stabilise the voltage, without appreciably affecting the energy balance. Sensors that have been decentrally installed can thus be supplied, or a minimal voltage supply for load monitoring and prompt readiness can thus be provided, even for larger switched power supplies and load parts. | 01-29-2015 |
20150035445 | LUMINESCENT SYSTEM AND ORGANIC EL DEVICE - The present invention aims to provide a luminescent system enabling contactless power supply, having a high ratio of light emission region, and securing a desired quantity of emitted light. The luminescent system is constituted by an organic EL device and a fixed-side wall surface. The device is formed by stacking an electrode layer of an anode side, an organic light-emitting layer, and a transparent electrode layer of a cathode side on a substrate and being sealed by a sealing part. Electrodes with a planar expanse are stacked on a face near the wall surface and are arranged so as to overlap a light emitting region where the organic light-emitting layer is disposed. Electrodes with a planar expanse are embedded in the wall surface. A power unit is electrically connected between the electrodes. The electrodes of the device and of the wall surface are opposite each other across a flooring material. | 02-05-2015 |
20150042235 | Power Supply Device and Illumination Device - According to one embodiment, a power supply device includes a substrate, a first inductor, and a second inductor. The substrate has a first surface and a second surface on opposite side from the first surface. The first inductor includes a first coil having a coil center axis substantially parallel to a first direction, is used for a switching circuit for controlling power supplied to a load, and is mounted on the first surface of the substrate. The second inductor includes a second coil having a coil center axis substantially parallel to the first direction, is electrically connected to the first inductor, and is mounted on the second surface of the substrate. As viewed in a direction orthogonal to the first surface, position of the first coil of the first inductor does not overlap position of the second coil of the second inductor. | 02-12-2015 |
20150048750 | LIGHT EMITTING SYSTEM AND VOLTAGE CONVERSION DEVICE THEREOF - A light emitting system includes a series connection of a light emitting unit and a variable current source, and a voltage conversion device that includes a rectifier circuit and an output circuit. The rectifier circuit rectifies an AC voltage to generate a rectified voltage across a first rectifier output coupled to one end of the series connection of the light emitting unit and the variable current source, and a second rectifier output. The output circuit is coupled between the second rectifier output and another end of the series connection of the light emitting unit and the variable current source, and is configured to generate a direct-current (DC) output voltage. | 02-19-2015 |
20150054416 | ADAPTATION CIRCUIT FOR COUPLING LED TO BALLAST - Adaptation circuits ( | 02-26-2015 |
20150061517 | Driving Circuit for Driving LED Load - A driving circuit includes a rectifier circuit and a LED driver integrated circuit. The rectifier circuit rectifies an ac power supply into a de power supply. The LED driver integrated circuit includes a regulator circuit, a voltage detector, a buck boost LED driver, and a common ground terminal. The regulator circuit regulates the dc power supply into a regulated voltage. The voltage detector detects whether the regulated voltage meets a voltage requirement and output the regulated voltage when the voltage requirement is met. The buck boost LED driver converts the regulated voltage detected into an output driving voltage according to a remaining voltage at a negative terminal of the LED load to drive the LED load. Voltage potentials at the common ground terminal and at a load ground terminal of the LED load are the same. | 03-05-2015 |
20150061518 | LIGHT ADJUSTING DEVICE WITH SWITCHING ELEMENT - A light adjusting device for adjusting the luminance of a light source is provided. The light adjusting device comprises a rectifier module, a first switch element, a second switch element and a control module. The rectifier module receives an AC signal from a first power node and a second power node, and rectifies the AC signal to output a driving signal to the light source. The first switch element is coupled to the first power node. The second switch element is coupled to the second power node. The control module outputs a control signal to the first and second switch elements to control the conduction states of the first and second switch elements. When the first and second switch elements are turned on, the driving signal provided to the light source is interrupted. | 03-05-2015 |
20150061519 | Control Apparatus, Control System, and Control Method - According to one embodiment, there is provided a control apparatus including a receiving section, a specifying section, and control sections. The receiving section receives a control signal. The specifying section specifies a control system corresponding to the control signal received by the receiving section. The control sections derive, according to the control system specified by the specifying section, control designated by the control signal received by the receiving section, and apply the derived control to a lighting device. | 03-05-2015 |
20150061520 | lamp device and a method for operating a lamp device - According to one embodiment there is provided a lamp device ( | 03-05-2015 |
20150061521 | METHOD AND APPARATUS FOR CALCULATING AN AVERAGE VALUE OF AN INACCESSIBLE CURRENT FROM AN ACESSIBLE CURRENT - In a power converter, a circuit determines an average value of an inaccessible current from an average value of an accessible current and a value of the operating duty cycle of the converter. A method of measuring an average value of an inaccessible current from a measured value of a current in a power converter by a duty cycle of a pulse width modulation (PWM) signal representing a duty cycle of the power converter. Coupling a voltage representing the measured value to an input of a low pass filter during a time period (D) and coupling the input of the low pass filter to a reference voltage during a time period (1−D). | 03-05-2015 |
20150061522 | METHOD AND APPARATUS FOR CALCULATING AN AVERAGE VALUE OF AN INACCESSIBLE CURRENT FROM AN ACESSIBLE CURRENT - In a power converter, a circuit determines an average value of an inaccessible current from an average value of an accessible current and a value of the operating duty cycle of the converter. A method of measuring an average value of an inaccessible current from a measured value of a current in a power converter by a duty cycle of a pulse width modulation (PWM) signal representing a duty cycle of the power converter. Coupling a voltage representing the measured value to an input of a low pass filter during a time period (D) and coupling the input of the low pass filter to a reference voltage during a time period (1−D). | 03-05-2015 |
20150061523 | CAPACITOR STEP-DOWN LED DRIVER AND DRIVING METHOD USING THE SAME - The present disclosure relates to a capacitor step-down LED driver and a driving method using the same. A capacitor step-down LED driver comprises a control circuit and a switching circuit. The control circuit turns on or off the switching circuit in response to an output current and an output voltage of the capacitor step-down LED driver, and thus controls an amount of energy supplied from an input side to an output side. In a first operation state, the switching circuit is controlled not to supply energy from the input side to the output side. In a second operation state, the switching circuit is controlled to supply energy from the input side to the output side. Thus, the output current is maintained to be a value of a desired driving current. | 03-05-2015 |
20150061524 | LIGHT-EMITTING DIODE DRIVING APPARATUS AND SEMICONDUCTOR DEVICE - A light-emitting diode driving apparatus including a rectifying circuit, a switching element, a choke coil, an output current sensing circuit, an LED light source, a rectifier diode, a control circuit, and a feedback sensing circuit which is connected to the output current sensing circuit for receiving an output feedback signal output from the output current sensing circuit, wherein the feedback sensing circuit outputs a feedback dummy signal, and outputs to the control circuit a control signal that controls switching of the switching element in response to a signal based on an error between the output feedback signal and the feedback dummy signal. | 03-05-2015 |
20150069924 | AC/DC POWER CONVERTER - In one embodiment, an AC/DC power converter can include: a rectifier bridge and a filter capacitor for converting an external AC voltage to a half-sinusoid DC input voltage; a first storage component, where during each switching cycle in a first operation mode, a first path receives the half-sinusoid DC input voltage to store energy in the first storage component, and a first current through the first storage component increases; a second storage component, where a second path receives a second DC voltage to store energy in the second storage component, and a second current through the second storage component increases; and a third storage component, where in a second operation mode, the first current decreases to release energy from the first to the third storage component, where the second DC voltage includes a voltage across the third storage component through a third path. | 03-12-2015 |
20150077003 | METHOD FOR OPERATING AN LLC RESONANT CONVERTER FOR A LIGHT-EMITTING MEANS, CONVERTER, AND LED CONVERTER DEVICE - An LLC resonant transformer ( | 03-19-2015 |
20150084528 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a rectifier circuit, a smoothing capacitor, and a normally on type transistor. The rectifier circuit is configured to rectify an alternating current supplied from a voltage source. The smoothing capacitor is charged by an output current output from the rectifier circuit. The normally on type transistor is connected between the rectifier circuit and the smoothing capacitor in series and is configured to limit an output current value of the rectifier circuit during a voltage input from the voltage source to an output current value higher than an output current value of the rectifier circuit during a steady operation. | 03-26-2015 |
20150084529 | Power Supply Device, Luminaire, and Lighting System - According to one embodiment, a power supply device includes a terminal connected to an output of a dimmer, a rectifier circuit, a switching circuit including an inductor, a switching element connected to the inductor in series, and a first rectifying element and configured to change the switching element to an ON state to feed an output current of the rectifier circuit to the inductor, after the dimmer changes from a non-conduction state to a conduction state, when the dimmer is a dimmer of a phase control type, and configured to change the switching element to the ON state to feed the output current of the rectifier circuit to the inductor, after the dimmer changes from the non-conduction state to the conduction state, when the dimmer is a dimmer of an anti-phase control type, and a DC-DC converter configured to convert the output voltage of the switching circuit. | 03-26-2015 |
20150084530 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a conductive first mounting board, a first switching element, a current control element, and a second switching element. The first switching element is mounted on the first mounting board. The current control element is mounted on the first mounting board, includes a main terminal connected to the first mounting board, is connected to the first switching element in series, and is configured to limit an electric current of the first switching element. The second switching element is connected to the current control element in series. An electric current flows to the second switching element when the first switching element is off. | 03-26-2015 |
20150084531 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a first inductor, a current control section configured to limit a current value of an electric current flowing through the first inductor to a predetermined current value, the current control section including a first switching element of a normally on type and a resistor connected to a main terminal of the first switching element, a rectifying element connected to the current control section in series, and a second inductor magnetically coupled to the first inductor. The second inductor is configured to induce a voltage for turning on the current control section, when the electric current of the first inductor increases, to induce a voltage for turning off the current control section, when the electric current of the first inductor decreases, and to supply the induced voltage to a control terminal of the current control section. | 03-26-2015 |
20150091456 | SINGLE-STAGE AC-DC POWER CONVERTER WITH FLYBACK PFC AND IMPROVED THD - A single-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The AC-DC power converter includes a high power factor correction (PFC) circuit configured in a flyback topology and operating in transition mode. The flyback PFC circuit has a PFC controller and is configured to draw an input AC current from an AC power supply. The input AC current has a first total harmonic distortion (THD). The flyback PFC circuit outputs a DC current to the load. The PFC controller is configured to sense a rectified input voltage. By multiplying the rectified input voltage sensed by the PFC controller, the input AC current drawn by the flyback PFC circuit has a second, much improved THD, which is achievable without the need of an expensive PFC controller. The rectified input voltage sensed by the PFC controller is multiplied using a Zener diode ladder. | 04-02-2015 |
20150091457 | SINGLE-STAGE AC-DC POWER CONVERTER WITH FLYBACK PFC AND SELECTABLE DUAL OUTPUT CURRENT - A single-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The AC-DC power converter includes a high power factor correction (PFC) circuit configured in a flyback topology and operating in transition mode. The flyback PFC circuit outputs a direct current (DC) voltage and a DC current. The PFC circuit further includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided to the load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents. The switch circuit includes a switch and three, fast Schottky diodes. | 04-02-2015 |
20150091458 | TWO-STAGE AC-DC POWER CONVERTER WITH SELECTABLE DUAL OUTPUT CURRENT - A two-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The first stage of the AC-DC power converter includes a conventional power factor correction (PFC) circuit that outputs a direct current (DC) voltage and a DC current. The second stage of the AC-DC power converter includes a low voltage flyback circuit that receives the DC voltage and the DC current. The low voltage flyback circuit includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided by the low voltage flyback circuit to the load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents. | 04-02-2015 |
20150091459 | Power Supply Circuit and Luminaire - A power supply circuit includes a bridge circuit, a transformer, a rectifying and smoothing circuit, a driver, a feedback circuit, and a power supply section. The bridge circuit converts a direct-current voltage into an alternating-current voltage. The transformer includes a primary winding wire and a secondary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. The driver controls ON and OFF of the switching element. The feedback circuit receives a detection signal of an output current flowing to the direct-current load and a differential signal obtained from fluctuation of the output voltage and feedback-controls the driver on the basis of the signals. The power supply section generates a driving voltage corresponding to the feedback circuit from the output voltage and supplies the driving voltage to the feedback circuit. | 04-02-2015 |
20150091460 | Power Supply Circuit and Luminaire - According to one embodiment, there is provided a power supply circuit including a direct-current voltage source, a bridge circuit, a transformer, and a rectifying and smoothing circuit. The bridge circuit includes at least one switching element and converts a direct-current voltage supplied from the direct-current voltage source into an alternating-current voltage according to ON and OFF of the switching element. The transformer includes a primary winding wire connected to the bridge circuit and a secondary winding wire magnetically coupled to the primary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage output from the secondary winding wire into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. The bridge circuit includes a capacitor connected between the primary winding wire and a terminal on a low potential side of the direct-current voltage source. | 04-02-2015 |
20150091461 | Power Supply Device and Lighting Device - According to one embodiment, there is provided a power supply device which includes a power conversion circuit which outputs an input power to an LED element as a load by converting the input power into a predetermined output power; and a control circuit which performs a feedback control of the power conversion circuit by detecting the output power of the power conversion circuit, and performs a dimming control which causes the LED element to be subject to a dimming operation based on a dimming signal which is output from a dimmer, in which, when a dimming OFF signal is input, the power conversion circuit outputs power which causes the LED element to be turned off while continuing an operation of the power conversion circuit. | 04-02-2015 |
20150102739 | Lighting Device - A system is described for providing unconditioned power using an alternating current (AC) power source in order to power light emitting diodes (LEDs). The system may include a plurality of light emitting diodes (LEDs), a microprocessor to send pulse-width modulated power signals to power the plurality of LEDs, a zener diode to limit a voltage provided to the microprocessor from the AC power source, and a varistor in series with the zener diode to clamp down the voltage from the AC power source to a pre-defined value to resist current in rush to the microprocessor. | 04-16-2015 |
20150102740 | Circuit and Method for Detecting the Duration of the Interruption of a Mains Input - A light bulb assembly comprises an electrical connection module, a driver circuit configured to provide electrical energy at a drive voltage, and a light source. The driver circuit converts electrical energy at an input voltage to the electrical energy at the drive voltage. A controller is configured to control the power converter to provide electrical energy at the drive voltage. The controller stops operation at an interruption of electrical energy to the driver circuit. The controller is configured to resume operation subsequent restoration of electrical energy to the driver circuit. The controller is configured to maintain the timing voltage above a first voltage level when the controller is in operation and to determine the duration of an interruption of electrical energy to the driver circuit. | 04-16-2015 |
20150115821 | LIGHT EMITTING DIODE DRIVER AND METHOD OF CONTROLLING THE SAME - There is provided a light emitting diode (LED) driver including: a power supplying unit including a dimmer and a rectifying unit and supplying a supply voltage to an LED device; and a control unit acquiring section information regarding the supply voltage and setting an LED on-time based on the section information. | 04-30-2015 |
20150115822 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode (LED) driving apparatus may include: a power converting unit switching input power to supply driving power to at least one LED; and a driving controlling unit controlling the supplying of the power of the power converting unit based on a switching period of the power converting unit and a demagnetization time in the switching period. | 04-30-2015 |
20150123553 | MULTI-CONTROL LIGHT REGULATOR - A multi-control light regulator includes a microprocessor, a regulator including a rectifier electrically connected to a power source and a LED lamp and a drive circuit electrically connected to the rectifier and the microprocessor, and a sensor electrically connected to the microprocessor and the power source. Thus, the microprocessor determines the LED lamp to be dimmable or non-dimmable subject to the operation of the regulator and gives a proper control to the LED lamp. | 05-07-2015 |
20150130362 | SPARK GAP ARRANGEMENT - A spark gap arrangement comprises a triggerable spark gap (TF) and a trigger circuit (TRG), which comprises a first and a second charge store (C | 05-14-2015 |
20150137690 | POWER SUPPLY MODULE FOR ENERGY SAVING LAMP - A power supply module ( | 05-21-2015 |
20150137691 | HALF-BRIDGE INVERTER, ELECTRONIC BALLAST AND LIGHTING DEVICE WITH THE HALF-BRIDGE INVERTER - The invention discloses a half-bridge inverter which includes first and second inverter input terminals for receiving a direct current (DC) voltage, first and second inverter switches, first and second drive circuits, and an inverter startup circuit. The first and second drive circuits are adapted to alternatively turn on and turn off the first and second inverter switches, which can convert the DC voltage to a high frequency alternating current (AC) voltage. The inverter startup circuit includes a capacitor, diode, and resistor. The capacitor and diode are connected in parallel and further electrically connected in a drive circuit in series. The resistor is electrically coupled to the first inverter input terminal and to the capacitor/diode parallel combination. The inverter startup circuit is used to trigger the first or second inverter switch. An electronic ballast containing the half-bridge inverter and a lighting device containing said electronic ballast are also disclosed. | 05-21-2015 |
20150137692 | LOAD CONTROL DEVICE FOR HIGH-EFFICIENCY LOADS - A two-wire load control device (such as, a dimmer switch or an electronic switch) for controlling the power delivered from an AC power source to an electrical load includes a controllably conductive device for controlling the power to the load, a microprocessor operable to generate a control signal that is representative of whether the load should be controlled on or off, a capacitor operable to produce a supply voltage for powering the microprocessor, a power supply that charges the capacitor when the controllably conductive device is non-conductive, and a control circuit that receives the control signal from the microprocessor. The control circuit is operatively coupled to the controllably conductive device for maintaining the controllably conductive device non-conductive after the beginning of each half-cycle until the magnitude of the supply voltage exceeds a predetermined threshold. | 05-21-2015 |
20150305102 | LED DRIVER CIRCUIT HAVING EFFICIENCY-IMPROVING FUNCTION - An LED driving circuit having an efficiency improvement function and connected to an alternating current (AC) power supply, includes: a rectifier circuit that rectifies the AC power supply; a control circuit connected to an output of the rectifier circuit; an LED load and a constant-current circuit that are connected to an output of the control circuit in series; a capacitor that is connected in parallel to the LED load and the constant-current circuit that are connected in series to each other, the capacitor smoothing the output of the rectifier circuit; and a detection circuit that detects whether the rectified voltage exceeds a predetermined particular voltage value that is equal to or greater than the sum of a voltage applied to the LED load when the LED load is turned on and a voltage applied to the constant-current circuit at a time when the LED load starts being turned on. | 10-22-2015 |
20150327340 | SYNCHRONIZED PWM-DIMMING WITH RANDOM PHASE - PWM-based dimming techniques are provided for lighting systems. The techniques can be used to eliminate or otherwise reduce the potential for strobing and flickering, and may be implemented, for example, in a driver suitable for powering LED lighting systems, but can be used with other suitable light sources as well. In an example embodiment, the potential for line frequency induced flicker, or even line disturbances that are periodic with the line frequency, can be eliminated or reduced by synchronizing the PWM frequency to the line frequency or so-called mains frequency, and the potential for strobing can be eliminated or reduced by either using a randomized phase angle on a cycle-to-cycle basis or by using multiple PWM LED drive circuits all having constant cycle-to-cycle phase angle but a different phase angle from drive circuit to drive circuit (or different from LED string to LED string, as the case may be). | 11-12-2015 |
20150351188 | CONSTANT VOLTAGE AND CONSTANT CURRENT DRIVER CIRCUIT - A driver circuit for delivering a generally constant voltage to a load is disclosed. The driver circuit includes a source of incoming AC power, a rectifier, and a constant voltage driver. The rectifier is connected to the source of incoming AC power and produces a DC voltage. The constant voltage driver receives the DC voltage from the rectifier. The constant voltage driver includes a selectively activated switching element for receiving the DC voltage, a controller, and an output line. The controller receives the DC voltage and is configured to send a drive signal to the switching element in order to activate the switching element. The output line provides the generally constant voltage to the load. | 12-03-2015 |
20150359053 | LIGHTING CIRCUITS, LUMINARIES AND METHODS COMPATIBLE WITH PHASE-CUT MAINS SUPPLIES - Lighting circuits and luminaires and methods are disclosed which are operable with a phase-cut dimmer, each circuit comprising a rectifier having a low side output and a high side output; a switched mode converter comprising a switch and an inductor, having a high side input connected to a bus rail, and having a configuration to draw current across a complete mains cycle; a controller for the switched mode converter; a filter circuit connected between the rectifier high side output and the bus rail and comprising a capacitor connected between the high side output of the mains rectifier and ground; and a resistance connected between the low side output of the rectifier and ground. The value of the resistance may be such the RC time constant of the resistor and filter circuit is greater than the time required for any ringing in the circuit to fall to no more than 20 mA. | 12-10-2015 |
20150366008 | LED Retrofit Lamp With a Strike Barrier - A LED retrofit lamp for replacement of fluorescent lamp or tube driven by fluorescent ballast is provided. The retrofit lamp is compatible with the fluorescent ballast that requires the presence of a barrier for striking an arc voltage. The present invention provides a strike barrier—a controllable barrier that does not allow current conduction until a threshold voltage is reached. When a current above the threshold voltage passes through the strike barrier, the circuit latches and allows conduction at normal voltage. The present invention also provides a circuit that replicates the cathode heater resistance of a fluorescent lamp to rapid start and programmed start ballast. | 12-17-2015 |
20150366014 | DRIVING CIRCUIT, ILLUMINATION LIGHT SOURCE, AND ILLUMINATION DEVICE - A driving circuit includes a rectifying and smoothing circuit that rectifies an AC dimming signal, and a voltage conversion circuit ( | 12-17-2015 |
20150373794 | ALTERNATING CURRENT RECTIFYING CIRCUIT AND ALTERNATING CURRENT RECTIFYING METHOD FOR DRIVING LED MODULE - Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module. The method comprises: when an alternating current module is in a positive half cycle, after an alternating current output by the alternating current module is rectified, outputting the alternating current to a positive half cycle rectifying branch circuit of an external LED module; when the alternating current module is in a negative half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the positive half cycle, carrying out discharging, and outputting the alternating current to a positive half cycle feed branch circuit of the external LED module; when the alternating current module is in the negative half cycle, rectifying the alternating current output by the alternating current module, and outputting the alternating current to a negative half cycle rectifying branch circuit of the external LED module; when the alternating current module is in the positive half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the negative half cycle, carrying out discharging, and outputting the alternating current to a negative half cycle feed branch circuit of the external LED module. By using the present invention, stability of an output voltage can be improved, and luminous efficiency of the LED module can be improved. | 12-24-2015 |
20150373802 | LIGHTING APPARATUS AND DIMMING REGULATION CIRCUIT THEREOF - The present invention discloses a dimming regulation circuit which stabilizes a rectified voltage in response to an unstable output voltage of a dimmer and a lighting apparatus including the dimming regulation circuit. The dimming regulation circuit stabilizes the rectified voltage and provides the stabilized rectified voltage to a lamp, when a rectified voltage corresponds to a preset stabilization required range. | 12-24-2015 |
20150382416 | SWITCHABLE LUMINANCE LED LIGHT BULB - A switchable luminance LED light bulb, including embodiments that may be used with any common commercial fitting. | 12-31-2015 |
20160007416 | LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES AND LINE/LOAD REGULATION CONTROL - An LED lighting device includes multiple luminescent devices driven by a rectified AC voltage. The multiple luminescent devices are turned on flexibly in a multi-stage driving scheme using multiple current controllers. The current settings of the two driving stages with the highest current level and the second highest current level are adjusted according to the variation in the rectified AC voltage V | 01-07-2016 |
20160014863 | CIRCUITS AND METHODS FOR REDUCING FLICKER IN AN LED LIGHT SOURCE | 01-14-2016 |
20160021715 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF - The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) circuit, a current limit (CL) circuit, and a determination circuit. The CL circuit generates a CL signal according to a current sense signal and a predetermined CL threshold. The determination circuit is coupled to the PWM circuit and the CL circuit, for generating an operation signal according to a PWM signal and the CL signal. The power stage circuit maintains an absolute level of an AC dimming current not lower than a holding current in an ON phase period. | 01-21-2016 |
20160044755 | DIMMING CIRCUIT AND METHOD FOR LEDS - The present disclosure relates to dimming circuit and method for LEDs. The dimming circuit obtains a DC voltage from an external AC power supply by using a TRIAC, an electronic transformer, and a rectifier bridge sequentially. The dimming circuit comprises a first power stage circuit, a second power stage, a first control circuit, and a second control circuit. The first power stage circuit has an input terminal configured to receive the DC voltage. The second power stage has an input terminal coupled to an output terminal of the first power stage and an output terminal coupled to an LED load. The first control circuit is configured to generate a first control signal in accordance with a first output voltage generated at the output terminal of the first power stage circuit, a first reference voltage and an upper threshold voltage to maintain an average value of the first output voltage to be consistent with the first reference voltage. The second control circuit is configured to generate a dimming signal in accordance with a first current and the first output voltage to control an operation of the second power stage circuit to maintain an output current of the second power stage circuit to be consistent with an expected driving current represented by the dimming signal. The first current is no less than a holding current of the electronic transformer. An input current of the first power stage circuit is maintained to be consistent with the first current by the first control signal when the first output voltage is in a continuously increasing state and is lower than the upper threshold voltage. The first output voltage decreases continuously and the input current is maintained to be consistent with a second current after the first output voltage reaches the upper threshold voltage. | 02-11-2016 |
20160049881 | MULTIPLE INDUCTIVE COMPONENT - A multiple inductive component ( | 02-18-2016 |
20160050724 | System and Method for Providing Surge Protection for an AC Direct Step Driver Lighting System - An AC direct driver lighting system including a surge protection circuit and a current limiting circuit is disclosed. According to one embodiment, the AC direct driver lighting system includes an LED load, a rectifier, and an LED driver configured to receive rectified AC voltage from an AC power source and drive the LED load. The AC direct driver lighting system further includes a surge protection circuit and a current limiting circuit disposed between the AC power source and the LED load. The surge protection circuit and the current limiting circuit suppress excessive current flowing through the AC direct driver lighting system. | 02-18-2016 |
20160057821 | Illumination Module - A lighting module includes a compatible part to transform and output an output voltage from a ballast, a transformation part to transform and output an output voltage from the compatible part, and a lighting part to emit light using an output voltage from the transformation part as a driving voltage. In the compatible part, a number of ports to receive the output voltage from the ballast is different form a number of ports to output the transformed output voltage to the transformation part. | 02-25-2016 |
20160057843 | Electrodeless Fluorescent Ballast Driving Circuit and Resonance Circuit with Added Filtration and Protection - A ballast circuit for a lighting system using an induction fluorescent lamp utilizes an AC-DC rectification circuit, a DC-DC boost power conversion circuit, a DC-AC half bridge inverter circuit, and a resonating circuit to ignite the lamp and maintain substantially constant power output of the lamp, while the DC-AC half bridge inverter circuit is further comprised of a gate isolation transformer connected in a half bridge inverter schematic which uses a ballast integrated circuit (IC) to drive a high side MOSFET and a low side MOSFET and the gate isolation transformer electrically isolates a gate signal to the high side MOSFET. | 02-25-2016 |
20160065055 | CIRCUIT AND METHOD OF CORRECTING A POWER FACTOR FOR AC DIRECT LIGHTING APPARATUS - A circuit for correcting a power factor for an AC direct lighting apparatus that includes a valley signal generating unit configured to receive a full-wave rectified AC input voltage signal and configured to compare an internal reference voltage signal and the AC input voltage signal to generate a valley signal, a reference voltage control unit configured to receive the generated valley signal and count clock cycles of an internal clock to detect a frequency of the AC input voltage signal and configured to determine a frequency of a drive current to control a reference voltage signal based on the determined frequency of the drive current and a reference voltage control clock generating unit configured to generate a pulse width modulation signal associated with a pulse width of the reference voltage signal and configured to generate the reference voltage control clock signal based on the generated pulse width modulation signal and the controlled reference signal. Thus, the circuit may control a phase of a drive current and adjust a variation of the reference voltage signal to improve the power factor of the circuit. | 03-03-2016 |
20160065085 | POWER SUPPLY DEVICE AND ILLUMINATION DEVICE - A power supply device includes a power supply input portion, a rectification portion, a smoothing portion, a power conversion portion, a power supply output portion, a signal input portion, a control portion, a circuit substrate, and a case. The circuit substrate is formed in an elongated rectangular plate-like shape. The power supply input portion is mounted on a first end portion of the circuit substrate in a longitudinal direction. The rectification portion, the smoothing portion, the power conversion portion, the control portion, and the power supply output portion are mounted on the circuit substrate in the stated order from the first end portion toward a second end portion in the longitudinal direction. The signal input portion is mounted at a position closer to the second end portion than the rectification portion in the circuit substrate. | 03-03-2016 |
20160066376 | ILLUMINATION LIGHT AND ILLUMINATION DEVICE - An illumination light includes: a bridge diode that performs full-wave rectification on an alternating-current signal; a switching converter that includes a switching device and that converts the alternating-current signal on which the full-wave rectification has been performed, into a direct-current signal; a controller that controls on/off timing of the switching device; and a semiconductor light emitting element that is connected to the switching converter and the controller and to which the direct-current signal is output. | 03-03-2016 |
20160066388 | LIGHTING APPARATUS AND LUMINAIRE - Lighting apparatus includes: AC/DC converter which converts AC voltage Vac to DC voltage Vdc; DC/DC converter which converts DC voltage Vdc to a DC voltage to be applied to LED; and detection circuit which detects AC voltage Vac. DC/DC converter includes switching element, and control circuit that performs a control of repeatedly turning on and off switching element in a boundary conduction mode. Control circuit performs the control under which ON time Ton is kept from exceeding an upper limit that is previously determined, and raises the upper limit when AC voltage Vac detected by detection circuit falls below a predetermined value. ON time Ton is a period of time during which switching element is kept ON. | 03-03-2016 |
20160073459 | LED LAMP DEVICE - Various embodiments relate to an LED lamp device. According to various embodiments, an LED lamp device is provided, including an LED unit for emitting light, a driving unit for driving the LED unit, such that the LED unit emits light at an operating point, and a resonance unit for receiving an input, providing AC power to the driving unit, and protecting the driving unit and the LED unit from being damaged by the input. | 03-10-2016 |
20160088700 | METHOD AND APPARATUS FOR DIGITAL DETECTION OF THE PHASE-CUT ANGLE OF A PHASE-CUT DIMMING SIGNAL | 03-24-2016 |
20160091146 | LIGHT EMITTING DIODE LIGHT BULB AND INCANDESCENT LAMP CONVERSION APPARATUS - Apparatus and methods separate the functions of light emission, heat dissipation, and power conversion in LED lighting. Doing so may facilitate cost-effective LED lighting and enable the conversion of existing incandescent lamps to LED service. An LED light bulb includes a thermal path from LED dies to a thermal transfer contact having an externally available surface. The LED light bulb and an incandescent lamp adapter are consumer-installable in an incandescent lamp. A heat spreader component of the lamp adapter contacts the thermal transfer contact of the LED light bulb to dissipate heat originating at the LED dies. A lamp adaptable LED power supply plugs into a standard AC power outlet and includes a receptacle to accept insertion of a lamp cord plug to deliver power to the LED light bulb. A lock-in safety device prevents retraction of the lamp cord plug from the LED power supply once inserted. | 03-31-2016 |
20160095174 | LED DRIVER CIRCUIT WITH OPEN LOAD DETECTION - Various examples directed to LED driver circuits capable of detecting the removal of an LED load are disclosed. In one example, the LED driver circuit may include a bleeder and load disconnect detection circuit having a bleeder circuit and a bleeder controller coupled to control the bleeder circuit. The bleeder controller may cause the bleeder circuit to draw a bleeder current that functions to supplement a load current drawn by an LED load to cause an input current of the LED driver circuit to be greater than a minimum holding current of a dimmer circuit. The bleeder controller may be further configured to detect a disconnect of the LED load based on the input current of the LED driver circuit, the bleeder control signal, and/or the bleeder current. In response to detecting a disconnect of the LED load, the bleeder controller may disable operation of the bleeder circuit. | 03-31-2016 |
20160119992 | Accurate Mains Time-Base for LED Light Driver - A controller for a driver circuit of a solid state lighting (SSL) device is described. The driver circuit comprises a power converter to transfer energy from AC mains voltage to the SSL device. The controller determines a dim level for the SSL device. The controller also determines a synchronization signal by comparing a voltage derived from the input voltage with a pre-determined threshold. The controller determines a sequence of PWM pulses based on the synchronization signal. The controller operates the power converter in a first operation mode for supplying energy to the SSL device at a first energy level within the sequence of PWM pulses, and operates the power converter in a second operation mode in between the PWM pulses. The second energy level is lower than the first energy level and the first energy level and/or a width of the PWM pulses depend on the dim level. | 04-28-2016 |
20160126860 | IMPROVEMENTS RELATING TO POWER ADAPTORS - A power adaptor is disclosed, which comprises an input for connection to an AC power supply, a resonant circuit coupled to the input that provides an output suitable for driving a load, at least one half-bridge drive circuit for providing a drive signal to the resonant circuit, and a switch controller for the half-bridge drive circuit. The switch controller is adapted to provide one or more of the following, in at least one mode: (i) to provide the high-side switch and the low-side switch with on-times of different durations, (ii) to provide the high-side switch and the low-side switch with on-times that overlap, and (iii) to provide the high-side switch and the low-side switch with on-times that are synchronous. This may be utilised to control the current delivered to the output without any need to change the frequency at which the resonant circuit is driven. | 05-05-2016 |
20160128142 | DRIVER DEVICE AND DRIVING METHOD FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT - The present invention relates to a driver device ( | 05-05-2016 |
20160134183 | VCC Charge and Free-Wheeling Detection via Source Controlled MOS Transistor - A driver circuit using a power converter allows free-wheeling detection and/or provision of supply voltage. A circuit controls a switching state of a power switch. A first port of the switch is coupled to an inductor. The circuit is coupled to a control port of the switch wherein the control port of the switch is different from the first port of the switch. The circuit comprises a unit generating a signal for controlling the switching state of the switch wherein the signal is provided to the control port of the switch. Furthermore, the circuit comprises free-wheeling sensing means to detect an oscillation of a voltage at a measurement port of the switch wherein the measurement port of the switch is different from the first port of the switch and wherein the oscillation of the voltage at the measurement port indicates free-wheeling of the inductor. | 05-12-2016 |
20160135258 | METHOD FOR MINIMIZING LED FLICKER OF AN LED DRIVER SYSTEM - A method for minimizing LED flicker of an LED driver system, the LED driver system comprising a PFC constant average current converter, a capacitor, an LED module, and a current regulator, the method including: a first step: the current regulator generating a control voltage according to an average of a difference between a reference voltage and a voltage at a second end of the LED module; and a second step: the current regulator determining a regulation value for a current flowing through the LED module according to the control voltage. | 05-12-2016 |
20160135260 | SWITCHING CIRCUIT FOR LIGHT-EMITTING DIODE - A switch circuit for light-emitting diode is provided. The switch circuit includes a power module, a light-emitting diode module, an inductor, a first switch, a second switch and a capacitor. When the input voltage of the power module is higher than the forward bias voltage of the light-emitting diode module, the first switch is switched repeatedly and the second switch is turned off, so that the power supply can charge the inductor and/or the capacitor. When the input voltage of the power module and the storage voltage of the capacitor both are lower than the forward bias voltage of the light-emitting diode module, the first switch and the second switch are controlled to switch repeatedly and synchronously, so that the power energy of the power module or the discharge energy of the capacitor can be used to continuously charge the inductor. | 05-12-2016 |
20160135263 | MODULARIZED LIGHT SYSTEM, CONTROL MODULE THEREOF AND POWER MODULE THEREOF - A modularized light system, a control module and a power module are provided. The modularized light system comprises at least a light module, a control module and a power module. The internal and external wiring of the power source is integrated into the power module. The wiring of the control circuit and the power transmission is integrated into the control module. The wiring of the power transmission and the light source is integrated into the light module. A novel design uses a single power module and a control module for transmitting and controlling the power to one or a plurality of light module. One or more connection units detachably connect the light modules. Thus, the system installation is simplified and design coordinated with advantages such as fast assembly, saving assemble time, saving effort, a neat appearance, no wire entanglement, and flexibility of extending lighting range can be achieved. | 05-12-2016 |
20160143104 | LED DRIVE CIRCUIT AND METHOD FOR DRIVING LED - An LED drive circuit and drive method thereof are provided. The drive circuit comprises: a rectifier circuit receiving a phase-control dimming signal with a conduction angle, and outputting a rectified signal; a converter comprising a switching element, with an input end coupled to the rectifier circuit and an output end coupled to an LED; and a controller having a first input end receiving the rectified signal, a second input end receiving a first sampling signal and an output end outputting a control signal according to the rectified signal and the sampling signal; wherein the switching element receives the control signal from the controller, thus executing an on/off operation to control current flowing through the LED. | 05-19-2016 |
20160150609 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME - A lighting device includes a rectifier circuit, a conversion circuit and a control circuit. A first inductor of a first series circuit and a second inductor of a second series circuit have inductances by which a time period, during which a diode is electrically conducted, is made shorter than a half period of a resonance period of a closed loop circuit. The closed loop circuit includes a first capacitor, the first inductor, a second capacitor and a third capacitor. The control circuit is configured to control a switching element in such a manner that the switching element is turned on at fixed periods. | 05-26-2016 |
20160150611 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME - A lighting device includes a rectifier circuit, a conversion circuit, a constant current circuit and a control circuit. The conversion circuit includes a first series circuit, a second series circuit and a third series circuit. The conversion circuit is configured to output a DC current by on/off of a switching element being controlled by the control circuit. A high potential-side terminal of the third capacitor is electrically connected to an output terminal. The low potential-side terminal of the third capacitor is electrically connected to an output terminal, via the constant current circuit. | 05-26-2016 |
20160165682 | LED DRIVING CIRCUIT OF MULTI-STAGE SWITCH BULB LAMP - An LED driving circuit of a multi-stage switch bulb lamp includes a power modulation module having a first switch, a second switch, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor and a fourth resistor. The first and second switches are respectively and serially connected to the first and second transistors, the first transistor is electrically connected to the second resistor, the other end of the second resistor is serially connected to the third resistor to form a reference voltage node and has a reference voltage, the first and second transistors are electrically connected to the reference voltage node, the other end of the third resistor is serially connected to the fourth resistor, and the second transistor is electrically connected to the third resistor. The first and second switches may be turned on/off to adjust the reference voltage value and change the power. | 06-09-2016 |
20160165688 | SEMICONDUCTOR DEVICE AND POWER SUPPLY DEVICE - A power supply topology is used in which a transistor is provided on the side of an output node of a rectifying circuit. An inductor is provided on the side of a reference node, a resistor is inserted between the transistor and the inductor, and one end of the resistor is coupled to a ground power supply voltage of a PFC circuit. The PFC circuit includes a square circuit which squares a result of multiplication of an input voltage detection signal and feedback information (output voltage of an error amplifier circuit). The PFC circuit drives on the transistor when a detection voltage developed at the resistor reaches zero, and drives off the transistor when the detection signal reaches an output signal of the square circuit. | 06-09-2016 |
20160174340 | DIGITAL COMMUNICATION RECEIVER INTERFACE CIRCUIT FOR LINE-PAIR WITH DUTY CYCLE IMBALANCE COMPENSATION | 06-16-2016 |
20160181063 | COMPACT, CONFIGURABLE POWER SUPPLY FOR ENERGIZING OZONE-PRODUCING CELLS | 06-23-2016 |
20160198532 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME | 07-07-2016 |
20160198537 | LED DRIVER CIRCUIT USING FLYBACK CONVERTER TO REDUCE OBSERVABLE OPTICAL FLICKER BY REDUCING RECTIFIED AC MAINS RIPPLE | 07-07-2016 |
20160205756 | METHOD AND APPARATUS FOR DETERMINING A TARGET LIGHT INTENSITY FROM A PHASE-CONTROL SIGNAL | 07-14-2016 |
20160381754 | Dimmable Universal Voltage LED Power Supply with Regenerating Power Source Circuitry and Non-Isolated Load - A light-emitting diode (LED) lighting device has an LED and a power supply including an inductor coupled to the LED. A cathode of the LED is coupled to the inductor opposite an anode of the LED. The inductor is coupled for receiving a first power signal. A transistor includes a conduction terminal coupled to the inductor to enable current through the inductor. A current from the first power signal is switched to generate a second power signal. A first diode includes an anode coupled to the inductor opposite the cathode of the LED. A controller includes a first terminal coupled to a cathode of the first diode and a second terminal coupled to a control terminal of the transistor. A zener diode is coupled to the first terminal of the controller. A capacitor is coupled between the first diode and inductor. A second diode is coupled to the first diode. | 12-29-2016 |
20190149051 | A BIFRED CONVERTER AND A METHOD OF DRIVING AN OUTPUT LOAD | 05-16-2019 |
20190150240 | TRIAC Dimmer Detection Circuit, Chip and Method, and LED Driving Chip and System | 05-16-2019 |
20090045754 | FLASH PATTERN SELECTION VIA POWER SWITCH - Lighting apparatus, systems and methods are disclosed. One lighting apparatus includes a light source, a power source in electrical communication with the light source, and a power button arranged to control electrical flow from the power source to the light source. The lighting apparatus also includes a programmable circuit in electrical communication with the power button, where the programmable circuit is programmed to set predetermined flash patterns for illuminating the light source in response to detecting a predetermined sequence of actuations of the power button. | 02-19-2009 |
20090085490 | Light Emitting Diode Driver Circuit With Shunt Switch - A LED driver circuit avoids undesirable light generated by a LED due to leakage current by shunting the output terminal to the feedback terminal during periods when it is desired that the LED remain turned off. The shunting operation is achieved by providing a switch (e.g., a FET) that is connected between the output and feedback terminals of the LED, and is controlled by the user supplied reference signal. During active operation (i.e., when the user supplied reference signal is “enabled” and the LED is lit), the switch remains open, allowing the driver circuit to generate the desired driving voltage across the LED. During inactive periods (i.e., when the user supplied reference signal is “disabled” and the LED is intended to be off), the switch is closed, which couples the output and feedback terminals to generate an essentially zero voltage drop across the LED. | 04-02-2009 |
20090309505 | AC ILLUMINATION APPARATUS WITH AMPLITUDE PARTITIONING - A method includes rectifying AC power and controlling switching of first, second and third currents from and rectified power and a switching sequence that is locked to the AC cycle time by sensing an amplitude of at least one of the AC power and the rectified power. The first, second and third currents are conducted through corresponding first, second and third series of color light emitting devices of different colors. The switching sequence repeats at least twice each AC cycle time. | 12-17-2009 |
20100060178 | METHOD AND APPARATUS FOR MAXIMIZING THE SUSTAINABLE FLASH OF A HANDHELD PORTABLE ELECTRONIC DEVICE - A method and apparatus for maintaining a maximum sustained flash current over the whole length of a flash using a programmable current drive in a handheld portable device powered by a battery. The method involves measuring the battery voltage before and after a flash is initiated and calculating the equivalent series resistance (ESR) of the battery. The calculated ESR is then used to adjust the flash current. The process may be repeated to correct for errors in the flash current. | 03-11-2010 |
20110279046 | INTELLIGENT USER INTERFACE INCLUDING A TOUCH SENSOR DEVICE - The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a microchip in communication with the switch wherein the switch is only capable of transmitting a signal to the microchip that the switch has been activated or deactivated. The microchip is in communication with the exhaustible power source of the electronic device and controls (i) the power on/off function of the device, (ii) at least one other function of the device in response to activation and deactivation signals from the switch, and (iii) an automatic shut off function in response to the receipt of an activation signal from the switch. | 11-17-2011 |
315208000 |
Discharge control discharge device in the supply circuit | 3 |
20120319608 | DIMMER SYSTEM AND DAMPER CIRCUIT THEREOF - A damper circuit is operable to dampen resonance of an electromagnetic interference filter when a phase dimmer activates. The damper circuit includes a capacitor and a bipolar junction transistor (BJT). The capacitor includes a first terminal and a second terminal. The BJT includes a control terminal, a collector terminal, and an emitter terminal. The control terminal of the BJT receives a control signal to make the BJT operate in the amplified area, and the collector terminal of the BJT is electrically connected to the second terminal of the capacitor. The first terminal of the capacitor receives the resonance generated to by the electromagnetic interference filter, and the BJT and the capacitor cooperate to dampen the resonance generated by the electromagnetic interference filter when the BJT operates in the amplified area. | 12-20-2012 |
20140239836 | Controlling An Electronic Dimming Ballast During Low Temperature Or Low Mercury Conditions - An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp. | 08-28-2014 |
20160381774 | METHODS AND SYSTEMS FOR CONTROLLING AN ELECTRICAL LOAD - An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp. | 12-29-2016 |
Entries |
Document | Title | Date |
20090001899 | Fluorescent Lamp With Built-In Anion Generator - The invention is a a fluorescent lamp with built-in anion generator. The invention includes a bulb | 01-01-2009 |
20090021175 | SUPPLY CIRCUIT AND DEVICE COMPRISING A SUPPLY CIRCUIT - Supply circuits ( | 01-22-2009 |
20090189534 | LED Lamp And Driving Apparatus For The Same - An LED lamp including at least one LED is electrically connected to a utility input voltage. A driving apparatus located inside a lamp holder of the LED lamp includes an input rectifying/filtering unit to accept the utility input voltage; an isolated power inverter electrically connected to the input rectifying/filtering unit to generate an a buck A.C.; an output rectifying/filtering unit electrically connected to the isolated power inverter to generate an output D.C. voltage to drive the at least one LED. The components of the driving apparatus could be located inside the LED lamp, and the components can provide an isolation protection against the utility input voltage. The driving apparatus can more precisely control output D.C. voltage, current, and power as output D.C. voltage and current signals sent from the output rectifying/filtering unit are feedbacked to a photo coupler signal feedback unit. | 07-30-2009 |
20090218953 | DIMMABLE INSTANT START BALLAST - In an instant start ballast, dimming control is provided over a range of operation in which lamps driven by the ballast do not require external cathode heating. An interface circuit ( | 09-03-2009 |
20090251059 | DIMMER TRIGGERING CIRCUIT, DIMMER SYSTEM AND DIMMABLE DEVICE - The invention relates to a dimmer triggering circuit ( | 10-08-2009 |
20090256486 | Light Dimming Device for Compact Fluorescent Lamp - A light dimming device for compact fluorescent lamp includes a rectifying circuit for rectifying an AC current signal into a zero crossing voltage signal and outputting it to a current limiting circuit; the current limiting circuit for limiting the zero crossing voltage signal and sending the current limited zero crossing voltage signal to a voltage regulating and filtering circuit and a first comparator; the voltage regulating and filtering circuit for regulating the current limited signal and sending the regulated current limited signal to a reference voltage generating circuit and a current controller; a reference voltage generating circuit for generating a reference voltage signal upon receiving the regulated current limited signal and sending the reference voltage signal respectively to the first comparator and a second comparator; a current controller for controlling the amount of a charging current of a capacitor; the first comparator for outputting a low voltage level signal to the capacitor after receiving the zero crossing voltage signal and the reference voltage signal to discharge the capacitor; the second comparator for outputting a drive signal to the drive circuit after receiving the discharging signal to turn on a power switch; the filter circuit for converting the discharging signal of the capacitor into a steady DC current signal and transferring the DC current signal to the compact fluorescent lamp so as to let the compact fluorescent lamp generate light of different luminance according to the amount of the DC current signal. | 10-15-2009 |
20090302772 | FLUORESCENT LAMP DIMMING CIRCUIT - In one embodiment, a fluorescent lamp dimming circuit includes power factor correction control, dimming control, and switching devices. The power factor correction control may be connected to power factor correction circuitry that produces a regulated DC buss. The dimming control circuit may be connected to the input of the fluorescent lamp dimming circuit for producing a driver signal whose frequency varies depending on the input voltage waveform perhaps as modified by a dimmer. The control circuit may produce a drive signal with a duty cycle profile to drive switching devices. The switching devices invert the DC buss voltage to an AC voltage waveform for driving a resonant tank circuit. The resonant tank circuit may include an inductance, a capacitance, and the impedance of a fluorescent lamp. The AC voltage waveform when applied to the resonant tank circuit may cause the fluorescent lamp to dim based on the dimmer setting. | 12-10-2009 |
20100090608 | END-OF-LAMP LIFE DETECTION CIRCUIT - An end of life (EOL) detection circuit for a gas discharge lamp. The circuit includes a comparator for comparing an input voltage to first and second threshold voltages and providing an EOL signal; a sensing circuit for sensing a DC offset in the lamp-voltage during the EOL of the lamp; and a reference voltage setting circuit responsive to the DC offset including a reference diode for setting an adjustable reference voltage as said input voltage to the comparator. | 04-15-2010 |
20100117546 | LED LIGHT-EMITTING DEVICE - The present invention relates to a LED light-emitting device comprising a substrate, at least one LED bulb and a rectifier assembly. The substrate comprises a flexible substrate. The flexible substrate comprises at least one pair of conductors. The conductors can be arranged straight or curved. The at least one LED bulb detachably connects to the conductors. The rectifier assembly comprises an electromagnetic interference (EMI) filter, a rectifier and a pulse width modulation (PWM) controller that stabilizes current flowing through the LED light-emitting device. | 05-13-2010 |
20110080102 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 04-07-2011 |
20110266965 | CONTROL CIRCUIT OF LIGHT-EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit ( | 11-03-2011 |
20110285301 | TRIAC DIMMER COMPATIBLE SWITCHING MODE POWER SUPPLY AND METHOD THEREOF - Triac dimmer compatible switching mode power supplies used as LED drivers are disclosed herein. A PFC controller is configured in the switching mode power supplies. With the PFC controller, the current keeping the triac in the on-state is supplied by the DC/DC converter, and the LC resonance is reduced. | 11-24-2011 |
20110316434 | ELECTRO MAGNETIC BALLAST FOR A GAS DISCHARGE LAMP - An electro magnetic ballast ( | 12-29-2011 |
20120007515 | CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AT LEAST ONE DISCHARGE LAMP - Various embodiments relate to a circuit arrangement for operating at least one discharge lamp. In order to prevent intrinsic flicker at low dimming settings and low temperatures, according to various embodiments, a direct current which is fed into the discharge lamp so as to avoid striated discharges at relatively high dimming settings is reduced or entirely eliminated. | 01-12-2012 |
20120019157 | POWER SUPPLY APPARATUS FOR LIGHT EMITTING DIODE - A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding, a secondary winding receiving a power induced from the primary winding, and a tertiary winding receiving the power induced from the primary winding. The first output unit is connected to the secondary winding of the transformer, and outputs a first power current to an LED in a first operating condition. The second output unit is connected to the tertiary winding of the transformer, and outputs a second power current to the LED in a second operating condition. When the LED is connected to the power supply apparatus for LED, the power supply apparatus allows a current equal to or less than a predetermined current to flow in the LED, thereby protecting the LED from an overcurrent. | 01-26-2012 |
20120043898 | ELECTRONIC BALLAST AND METHOD FOR OPERATION OF AT LEAST ONE DISCHARGE LAMP - Various embodiments provide an electronic ballast for operation of at least one discharge lamp, with the electronic ballast having an apparatus for power factor correction with a voltage converter. The voltage converter itself includes an inductance, a diode and a switch. A control apparatus, which produces a square-wave signal as a control signal to the switch of the apparatus for power factor correction, includes an I regulator. This produces a first component of the on time of the control signal. In order to react to short-term power demands in the load circuit for example on ignition of the discharge lamp, an electronic ballast furthermore may include a power determining apparatus, which is coupled to the control apparatus, with the control apparatus being designed to vary the control signal as a function of the power consumed in the discharge lamp. | 02-23-2012 |
20120043899 | Electronic Dimming Ballast Having Advanced Boost Converter Control - An electronic ballast for driving a gas discharge lamp includes a power converter for generating a DC bus voltage, where the bus voltage is controlled to different magnitudes during different operating modes of the ballast. The ballast comprises a control circuit that is coupled to the power converter for adjusting the magnitude of the bus voltage to a first magnitude when the lamp is off, to a second magnitude when preheating filaments of the lamp, and to a third magnitude when the lamp is on. The control circuit is also operable to preemptively adjust the magnitude of the bus voltage prior to changing modes of operation. For example, when turning the load on, the control circuit first adjusts a power-conversion-drive level of the power converter to begin adjusting the magnitude of the bus voltage towards a predetermined magnitude, and then waits for a predetermined time period before attempting to turn the load on. | 02-23-2012 |
20120056548 | CIRCUIT AND METHOD FOR DRIVING LED LAMP WITH A DIMMER - A system for driving an LED (light-emitting diode) lamp includes a dimmer circuit coupled to a line input voltage for varying a magnitude of an input voltage and a transformer having a primary winding, a secondary winding, and one or more auxiliary windings, the primary winding coupled to the dimmer circuit. The system also includes an output rectifying circuit coupled to the secondary winding for providing an output current to the LED lamp and a power switch coupled to the primary winding for controlling a current flow in the primary winding. The system further includes a controller having a comparator and a capacitor for providing a control signal to control the power switch for regulating the output current. The controller coupled to the dimmer circuit for receiving an average input voltage signal from the dimmer circuit, wherein the control signal is characterized by a duty cycle that is determined by a ratio of a charging current to a discharging current of the capacitor, and the ratio is related to the average input voltage signal from the dimmer circuit. | 03-08-2012 |
20120081018 | Digitally controlled current regulator for high power solid state lighting - An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (I | 04-05-2012 |
20120086350 | FULL-BRIDGE ELECTRONIC BALLAST HAVING SIMPLIFIED CONTINUOUS-CONDUCTION-MODE CHARGE PUMP PFC CIRCUIT - The configurations of an electronic ballast are provided in the present invention. The proposed electronic ballast includes a filter circuit having a first and a second output terminals, a rectifier circuit having a first input terminal, a second input terminal coupled to the second output terminal of the filter circuit, and a first output terminal, and a continuous-conduction-mode charge pump PFC circuit including a first inductor having a first terminal coupled to the first input terminal and a second terminal coupled to the first output terminal of the filter circuit, a second inductor having a first terminal and a first capacitor having a first terminal coupled to the first terminal of the first inductor and a second terminal coupled to the first terminal of the second inductor. | 04-12-2012 |
20120091907 | LIGHTING CIRCUIT FOR LIGHTING LED, LAMP AND LIGHTING DEVICE - A lighting circuit that receives power from an alternating-current power supply | 04-19-2012 |
20120098447 | METHOD FOR ADJUSTING LIGHT BRIGHTNESS USING A TOGGLE SWITCH AND RELATED ILLUMINANT SYSTEM - A method for adjusting the brightness of a light source is performed according to the status of input voltage which is determined by detecting how and how many times a toggle switch switches state. When a user switches the state of the toggle switch for the first time in order to turn on/off the light, the brightness of the light source gradually increases/decreases within a dimmer period, during which the user may select an appropriate brightness of the light source by giving a swift double-toggle on the toggle switch. | 04-26-2012 |
20120104955 | LED WITH INTEGRATED CONSTANT CURRENT DRIVER - An LED package containing integrated circuitry for matching a power source voltage to the LED operating voltage, LEDs containing such integrated circuitry, systems containing such packages, and methods for matching the source and operating voltages are described. The integrated circuitry typically contains a power converter and a constant current circuit. The LED package may also contain other active or passive components such as pin-outs for integrated or external components, a transformer and rectifier, or a rectifier circuit. External components can include control systems for regulating the LED current level or the properties of light emitted by the LED. Integrating the power supply and current control components into the LED can provide for fabrication of relatively small LEDs using fewer and less device-specific components. | 05-03-2012 |
20120112650 | DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES - A controller for controlling dimming of a light-emitting diode (LED) light source includes a switch monitoring pin, a current monitoring pin, and a control pin. The switch monitoring pin monitors an operation of a power switch which transfers an AC voltage to a rectifier when the power switch is on. The current monitoring pin receives a current monitoring signal indicating a current flowing through the LED light source. The control pin generates a control signal to control a second switch coupled in series with the LED light source to adjust the brightness of the LED light source according to the operation of the power switch. | 05-10-2012 |
20120133293 | STEPDOWN DC-DC CONVERTER FOR LIGHT EMITTING DIODE, AND POWER SUPPLY DEVICE AND METHOD USING THE SAME - A stepdown DC-DC converter is adapted to provide a power supply voltage necessary to control the operation of an LED. The stepdown DC-DC converter includes: a reference voltage supplier for providing a reference voltage; a feedback unit for feeding back the power supply voltage on an output line; an operational amplifier for operationally amplifying the reference voltage and the fed-back power supply voltage; a switch unit for switching on/off a DC voltage on an input line toward the output line; and a charging and discharging circuit for selectively performing a charging operation of the switched voltage from the switch unit and a discharging operation of its charged voltage according to the switching operation of the switch unit to provide the power supply voltage to the output line. | 05-31-2012 |
20120139431 | VARIABLE LOAD CIRCUITS FOR USE WITH LIGHTING CONTROL DEVICES - A variable load circuit ( | 06-07-2012 |
20120146525 | APPARATUS AND METHODS OF OPERATION OF PASSIVE AND ACTIVE LED LIGHTING EQUIPMENT - This invention is concerned with the control and design of a passive or an active LED lighting system that does not need electrolytic capacitors in the entire system and can generate light output with reduced luminous flux fluctuation. The proposal is particularly suitable, but not restricted to, off-line applications in which the lighting system is powered by the ac mains. By eliminating electrolytic capacitors which have a limited lifetime of typically 15,000 hours, the proposed system can be developed with robust electrical components such as inductor and diode circuits, and it features long lifetime, low maintenance cost, robustness against extreme temperature variations and good power factor. The proposed circuits can become dimmable systems if the AC input voltage can be adjusted by external means. | 06-14-2012 |
20120146526 | Electronic Ballast with High Power Factor - This invention provides an integrated power supply for a controller of an electronic ballast for a fluorescent lamp. The integrated power supply couples output power from the electronic ballast and uses the coupled power to provide power to the controller. In one embodiment, the electronic ballast may include a rectifier for converting an alternating current input voltage into a direct current output voltage, and a circuit including a combined power factor correction (PFC) stage and an inverter, wherein the PFC stage and the inverter share a switch. Also provided is a controller for an electronic ballast. The controller may include a voltage mode or current mode duty ratio controller that controls a duty ratio of a switch of the ballast. The controller and the ballast allow dimming of the fluorescent lamp while maintaining a high power factor. | 06-14-2012 |
20120153854 | LIGHTING CIRCUIT, LAMP, AND ILLUMINATION APPARATUS - A lighting circuit that is for a lamp including an LED as a light source and that includes a resonant circuit that can be designed with ease. A lighting circuit | 06-21-2012 |
20120153855 | CIRCUIT OF LED DRIVING POWER, DRIVING POWER AND LIGHTING DEVICE - The present invention is adapted for the field of power supply and provides a circuit of LED driving power, LED driving power and LED lighting device, the circuit of LED driving power comprises a over-voltage protection unit, a AC input filter unit, a full-wave rectifier unit and a single-stage power conversion unit, where the single-stage power conversion unit comprises an auxiliary power supply circuit, a switching circuit and a control unit in which the auxiliary power supply circuit is used to provide auxiliary power supply for single power conversion stage, the switching circuit is used to control DC output by switching on and switching off and the control unit is used to control time point of turning on and turning off dynamically based on the information collected. The present invention can improve the overall efficiency of the LED driving power by controlling switching circuit dynamically in single-stage power conversion unit. | 06-21-2012 |
20120161654 | CONSTANT CURRENT POWER SUPPLY DEVICE - A constant current power supply device according to the present invention includes: an error amplifier to amplify an error signal of an error voltage between a voltage of a current detection resistor and a reference voltage, and a second control circuit to sample and hold the error signal in an ON period of the external signal, output the error signal to a first control circuit, hold the error signal just before the external signal is turned from ON to OFF, increase an amplification ratio of the error amplifier by a predetermined magnification ratio in an OFF period of the external signal, and output the increased error signal to the first control circuit. | 06-28-2012 |
20120161655 | BALLAST WITH ANTI-STRIATION CIRCUIT - A ballast including an inverter circuit for providing an oscillating power signal for energizing at least one lamp. The inverter circuit includes a first transistor having a first gain and a second transistor having a second gain, each configured for alternately operating between a conductive state and a non-conductive state. The power signal has a waveform cycle comprising a first pulse generated when a first transistor operates in a conductive state, and a second pulse generated when the second transistor operates in a conductive state. The integral value of the first pulse of each waveform cycle of the power signal is different from the integral value of the second pulse of each waveform cycle such that a differential relationship between the first gain and the second gain is greater than or equal to a minimum value in order to minimize lamp striations. | 06-28-2012 |
20120169243 | CIRCUITS AND METHODS FOR CONTROLLING DIMMING OF A LIGHT SOURCE - A controller that monitors a rectified voltage and detects whether the rectified voltage comes from a TRIAC dimmer or an on/off switch dimmer is disclosed. The controller controls dimming of a light source according to the rectified voltage if the rectified voltage comes from the TRIAC dimmer. The controller controls dimming of the light source according to an operation of the on/off switch dimmer if the rectified voltage comes from the on/off switch dimmer. | 07-05-2012 |
20120176054 | LIGHT DEVICE AND POWER CONTROL CIRCUIT THEREOF - A light device comprising a light emitting unit, a voltage control unit, and a current control unit is provided. The light emitting unit is capable of receiving DC power. The voltage control unit has a power input terminal, a power output terminal, and a voltage setting member, with the power input terminal connecting with the light emitting unit, the voltage setting member having a threshold value to control the voltage of the power output terminal in a value equal to or lower than the threshold value. The current control unit has a voltage regulating member and a current adjusting member, with the voltage regulating member connecting with the power output terminal of the voltage control unit and generating a stable DC voltage, and with the current adjusting member connected between the voltage regulating member and a ground point to stabilize a current passing through the current adjusting member. | 07-12-2012 |
20120176055 | APPARATUS FOR CONTROLLING BLEED SWITCH, POWER SUPPLY, AND METHOD FOR DRIVING POWER SUPPLY - A power supply has a TRIAC dimmer, and an AC-DC converter connected to the TRIAC dimmer. The AC-DC converter has a power switch, a bleed switch, and a controller. The controller turns off the bleed switch in a first time duration and turns on the bleed switch in a second time duration. Magnitude of a current of the power switch in the first time duration is larger than magnitude of a current of the power switch in the second time duration. Magnitude of a current of the bleed switch in a third time duration within the second time duration is smaller than magnitude of a current of the bleed switch in a fourth time duration within the second time duration. | 07-12-2012 |
20120176056 | Circuit Arrangement for Operation of at Least One LED - In various embodiments, a circuit for operating an LED includes input terminals for coupling to a supply voltage; output terminals for providing output DC voltage(s) to the LED(s); an inverter having a bridge circuit with at least first and second electronic switches comprising control electrodes, reference electrodes and working electrodes, wherein first and second electronic switches are serially coupled between input terminals, forming a first bridge center point; a first inductor serially coupled between first bridge center point and an output terminal; and a drive circuit having output terminals, wherein one output terminal is coupled to control electrode of first electronic switch and second output terminal is coupled to control electrode of second electronic switch; configured so that-drive circuit comprises control devices, wherein one control device includes a second inductor magnetically coupled to the first inductor, and wherein second control device includes third inductor magnetically coupled to first inductor. | 07-12-2012 |
20120181941 | LED DRIVING APPARATUS AND LED LIGHTING APPARATUS - An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q | 07-19-2012 |
20120194089 | LED POWER SUPPLY DEVICE - An LED power supply device is provided. In the invention, a digital control device and a programmable interface are used to set an output specification of the LED power supply device, such that one smart LED power supply device can be used to supply power to the LED lamps of different specifications. In this way, it is unnecessary to specifically design and test the power supply devices for the LED lamps of different specifications, so that a design and production cycle of the LED power supply devices and costs thereof are greatly reduced. On the other hand, usage of the digital control device avails monitoring and controlling a state of the LED lamp, for example, implementing temperature control, time control, color and luminance control, etc., by which a service life, efficiency and flexibility of the LED lamp are enhanced. | 08-02-2012 |
20120194090 | SWITCHING POWER CIRCUIT, AND LIGHTING DEVICE FOR SEMICONDUCTOR LIGHT-EMITTING ELEMENT AND ILLUMINATION APPARATUS USING SAME - A switching power circuit includes a first switching element having one end connected to a positive electrode of a first capacitor, a second switching element having one end connected to a negative electrode of the first capacitor, an inductive element having one end connected to the other ends of the first and the second switching element, a semiconductor switching element connected in parallel to the current limiting resistor, and a second capacitor connected to a control electrode of the semiconductor switching element. The second capacitor is charged by using a voltage induced to the inductive element when the first or the second switching element is off. | 08-02-2012 |
20120200230 | LED LIGHTING DEVICE WITH OUTPUT IMPEDANCE CONTROL - An LED lighting device is provided with output impedance control to stabilize an optical output across a wide current range. A switching power supply generates the output current, with switching control circuitry to determine switching frequency and an ON period for an associated switch, and to turn on/off the switch according to the determined frequency and ON period. An impedance element is coupled across output terminals for the lighting device, with an impedance value set so that a load current is larger than a current flowing to the impedance element at maximum on-duty of the switch and a current flowing to the impedance element is larger than the load current at minimum on-duty. The impedance element may be a variable impedance element, wherein an impedance control circuit adjusts the variable impedance such that an impedance value for minimum on-duty of the switch is smaller than that for a maximum on-duty. | 08-09-2012 |
20120206056 | CONSTANT-CURRENT-DRIVE LED MODULE DEVICE - A constant-current-drive LED module device includes a rectifier configured to receive and rectify an alternating current power source; a unidirectional LED module unit configured to connect to one end of the rectifier; and a constant current unit configured to connect between the unidirectional LED module unit and the other end of the rectifier to control constant current. | 08-16-2012 |
20120212145 | ILLUMINATION BRIGHTNESS CONTROL APPARATUS AND METHOD - An illumination brightness control apparatus receives an input voltage from a light dimmer and produces a control signal to regulate a drive signal to a power conversion switch of a switching mode power converter. The apparatus includes a voltage conditioning circuit to condition the dimmer input voltage to provide a conditioned voltage signal; an ADC circuit to sample analog data of the conditioned voltage signal at a sampling rate that is high relative to a nominal variation rate of the dimmer input voltage and to provide digital data corresponding to the sampled analog data; a digital signal processing circuit to produce a running data average of the digital data; and a controller to produce a signal corresponding to the running data average as the control signal to regulate the drive signal. | 08-23-2012 |
20120217888 | LED DRIVER CIRCUIT - The present invention is directed to an LED driver circuit. The LED driver circuit has a control module executing the power factor correction (PFC) by providing a divided voltage being directly proportional to the input voltage to the control module and calculating a feedback signal associated with the input signal. | 08-30-2012 |
20120223650 | LIGHTING DEVICE - Information technology is becoming more and more present in illumination applications, such as lighting devices. To limit the installation effort and cost of such illumination applications lighting devices compliant with the Power over Ethernet can be used. There is provided a lighting device which is powered via Power over Ethernet and where the driver of the lighting device is directly compatible with the Power over Ethernet standard. With such an internal Power over Ethernet driver, the power delivered to the light source of the lighting device can be influence gradually, thereby allowing the light source to operate at a different power level instead of shutting the light source down completely. | 09-06-2012 |
20120229040 | METHOD AND APPARATUS TO FACILITATE COUPLING AN LED-BASED LAMP TO A FLOURESCENT LIGHT FIXTURE - Some embodiments described herein provide methods and apparatuses to facilitate coupling a light-emitting diode (LED)-based lamp to an electronic or inductive fluorescent light fixture (typically with ballast). Specifically, some embodiments include circuitry that simulates an electrical behavior of a fluorescent lamp. The embodiments also include one or more LEDs that are controlled by the circuitry. | 09-13-2012 |
20120229041 | LED DRIVER FOR POWERING AN LED UNIT FROM A ELECTRONIC TRANSFORMER - An LED driver comprising a power converter for powering an LED unit and a control unit for controlling the power converter is provided. The power converter comprising an input terminal for receiving a rectified AC supply voltage, and an output terminal for supplying a current to the LED unit, and the control unit comprising—an input for receiving a supply signal representative of the supply voltage and—an output for providing a control signal to the power converter The control unit is further arranged to:—determine the control signal for controlling the power converter based on the supply signal, and—control the power converter to supply the current to the LED unit based on the control signal, the current being amplitude modulated in synchronism or in phase with the rectified AC supply voltage. | 09-13-2012 |
20120235585 | METHOD AND APPARATUS SELECTIVELY DETERMINING UNIVERSAL VOLTAGE INPUT FOR SOLID STATE LIGHT FIXTURES - A device for detecting a dimmer phase angle set by operation of a dimmer for a solid state lighting load includes a processor having a digital input, a first diode connected between the digital input and a voltage source and a second diode connected between the digital input and ground. The device further includes a first capacitor connected between the digital input and a detection node, a second capacitor connected between the detection node and ground, and a resistance connected between the detection node and a rectified voltage node, which receives a rectified voltage from the dimmer. The processor is configured to sample digital pulses at the digital input based on the rectified voltage and to identify the dimmer phase angle based on lengths of the sampled digital pulses. | 09-20-2012 |
20120242237 | SCR DIMMING CIRCUIT AND METHOD - The present invention relates to a silicon-controlled rectifier (SCR) dimming circuit and method for regulating the luminance of a light-emitting diode (LED) load. In one embodiment, an SCR dimming circuit can include: an SCR rectifying circuit having an SCR element that receives an AC power supply, and generates a lack-phase AC voltage; a rectifier bridge that converts the lack-phase AC voltage to a lack-phase DC voltage, where the lack-phase DC voltage is filtered through a filter capacitor to generate a smooth DC voltage; a conduction phase angle signal generator that receives the lack-phase DC voltage and generates a controlling signal indicating a conduction phase angle range of the SCR element; and a dimming signal generator that compares the controlling signal and a slope reference signal to output a dimming signal to control the luminance of the LED load. | 09-27-2012 |
20120242238 | Light Emitting Device Power Supply Circuit, and Light Emitting Device Driver Circuit and Control Method Thereof - The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit. | 09-27-2012 |
20120248999 | SWITCHING POWER-SUPPLY DEVICE AND LUMINAIRE - According to one embodiment, a switching power-supply device includes a switching element, a constant current element, a rectifying element, first and second inductors, and a constant voltage circuit. The switching element supplies, when the switching element is on, a power-supply voltage of a direct-current power supply to and feeds an electric current to the first inductor. The constant current element is connected to the switching element in series and turns off the switching element when the electric current of the switching element exceeds a predetermined current value. The rectifying element is connected to any one of the switching element and the constant current element in series. The second inductor is magnetically coupled to the first inductor and supplies induced potential to a control terminal of the switching element. The constant voltage circuit applies control potential to a control terminal of the constant current element. | 10-04-2012 |
20120249000 | LED DIMMER CIRCUIT - A TRIAC dimmer gates an AC waveform from an AC power source in proportion to a control signal and outputs a TRIAC pulse having part of the waveform missing. The TRIAC pulse is rectified and is applied to an LED array and the drive current flowing to the LED array is detected at a current detection resistor. The drive current value and a predetermined value are compared at a comparator and in accordance with the comparison result thereof the control transistor is turned off. Then, the TRIAC pulse is converted to a DC voltage signal and in accordance with the obtained DC voltage signal the drive current value or the predetermined value input by the comparator are changed. Furthermore, instead of the TRIAC pulse, a PWM pulse supplied from an external source may also be utilized. | 10-04-2012 |
20120249001 | LIGHTING POWER SUPPLY DEVICE - A lighting power supply device includes a control circuit controlling a transistor that controls a drive current flown through a lamp, receiving a pulsating flow converted from an alternating current by a rectifying circuit rectifying the alternating current subjected to phase control by a phase-controlled dimmer, and generating/outputting direct current voltage/current supplied to the lamp. The control circuit includes a time-voltage conversion circuit converting a time decided according to a phase of a voltage corresponding to the pulsating flow into a voltage; and a terminal to which a capacitor with an arbitrary capacitance value is connectable. The time-voltage conversion circuit allows the capacitor to generate a charging voltage corresponding to the phase of the pulsating flow. A sample-and-hold circuit takes in the charging voltage of the capacitor at predetermined timing corresponding to a change of an output of a voltage comparison circuit, and holds/outputs the taken-in voltage until next timing. | 10-04-2012 |
20120249002 | Method and Apparatus for Driving a LED with Pulses - A method and an apparatus are provided. The apparatus comprises a power source node; a light-emitting diode; a full-wave rectifier configured to produce unipolar half-waves from an alternative current mains supply connected to the power source node; and a voltage controlled switch configured to drive the light-emitting diode with pulses, each pulse derived from a half-wave, the width of the pulses being inversely proportional to mains supply voltage. | 10-04-2012 |
20120256552 | BALLAST STRUCTURE USED FOR HIGH-INTENSITY DISCHARGE LAMP - Disclosed is a ballast structure on which a high-intensity discharge lamp (HID lamp) can be installed and which can light the HID lamp; the ballast structure is provided with a base and an HID lamp seat provided on the base, and the base is provided with a direct-current (DC) boost circuit, an alternating-current (AC) rectifier circuit and an ignition circuit, all of which circuits are arranged to form a circuit functioning as a ballast; the HID lamp seat is provided with positive-electrode and negative-electrode contact ends electrically connected to positive-electrode and negative-electrode output ends of the AC rectifier circuit and of the ignition circuit of the base; and the HID lamp installed on the ballast structure can be lit and kept in normal operation by a DC current. | 10-11-2012 |
20120262077 | LED TRAFFIC SIGNAL WITH SYNCHRONIZED POWER PULSE CIRCUIT - An improved LED traffic signal is provided. The LED traffic signal suitably includes a housing with an opening, a printed circuit board coupled to the housing, and a power supply system coupled to the printed circuit board. The power supply system includes a power supply module that receives an AC input voltage from an AC input line and transforms the AC input voltage into a DC voltage with a regulated current to power the LED load, and a synchronized power pulse circuit connected to the power supply that generates a synchronized power pulse representing a power consumption substantially equivalent to that of a halogen or incandescent traffic signal. | 10-18-2012 |
20120268023 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light-emitting diode (LED) light source includes a buck-boost converter and a controller. The buck-boost converter receives an input voltage and an input current and powers the LED light source, and comprises a switch controlled by a driving signal. The controller receives a first signal indicating a current through the LED light source, and generates the driving signal based on the first signal to control the switch and to adjust the current through the LED light source. The buck-boost converter further comprises a current sensor which provides a second signal indicating an instant current flowing through the buck-boost converter, wherein the first signal is derived from the second signal, and wherein a reference ground of the controller is different from a ground of the driving circuit. | 10-25-2012 |
20120274225 | Controller Customization System With Phase Cut Angle Communication Customization Data Encoding - A controller is configured to generate one or more power control signals for a lamp to supply power to the lamp from a supply voltage. The controller is further configured to receive customization data encoded in the supply voltage. Thus, in at least one embodiment, the controller receives the customization data via one or more power terminals of the lamp. Phase cut angles in the supply voltage provided to the controller encode the customization data, and each phase cut angle encodes N symbols of data. N is an integer greater than or equal to one (1). In at least one embodiment, the customization data alters the controller from one state to another state in accordance with data represented by phase cuts in the supply voltage that encode the customization data. Examples of customization data include calibration data and configuration data. | 11-01-2012 |
20120280633 | TWO-WIRE DIMMER CIRCUIT FOR A SCREW-IN COMPACT FLUORESCENT LAMP - A dimmer switch for controlling the intensity of a dimmable screw-in compact fluorescent lamp provides smooth dimming of the fluorescent lamp and prevents flickering of the lamp due to multiple re-strikes. The dimmer switch prevents multiple re-strikes by avoiding multiple firings of a controllably conductive switching device of the dimmer circuit by limiting the high-end light intensity of the fluorescent lamp. Specifically, the dimmer switch limits the length of a conduction interval of the controllably conductive switching device to less than approximately 75% of each half-cycle. The dimmer switch may include a user-accessible adjustment actuator for changing the dimmer switch between an incandescent operating mode and a screw-in compact fluorescent mode. The dimmer switch may also be operable to automatically change the dimmer switch between the incandescent operating mode and the screw-in compact fluorescent mode by detecting the occurrence of the multiple firings of the controllably conductive switching device. | 11-08-2012 |
20120286680 | ISOLATED CAPACITOR DRIVE CIRCUIT FOR THIN-FILM SOLID-STATE LIGHTING - Solid-State lighting devices and fixtures are presented in which capacitor plates are formed in the fixture and in the lighting device to form AC coupling capacitors with one or more intervening dielectrics when the lighting device is placed in the fixture to power a driver circuit of the lighting device while providing a fixture with no exposed live wiring. | 11-15-2012 |
20120286681 | METHOD AND APPARATUS FOR DETERMINING A TARGET LIGHT INTENSITY FROM A PHASE-CONTROL SIGNAL - A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit comprises a phase-control-to-DC converter circuit that receives the phase-control voltage, which is characterized by a duty cycle defining a target intensity of the lamp tube, and generates a DC voltage representative of the duty cycle of the phase-control voltage. Changes in the duty cycle of the phase-control voltage that are below a threshold amount are filtered out by the converter circuit, while intentional changes in the duty cycle of the phase-control voltage are reflected in changes in the target intensity level and thereby the intensity level of the lamp tube. | 11-15-2012 |
20120293085 | ACTIVE DAMPER AND DRIVING METHOD THEREOF - An exemplary embodiment of the present invention relates to an active damper and a driving method thereof. An AC input passed through a dimmer is transmitted to an active damper through a rectification circuit. The active damper includes a damper resistor connected to the rectification circuit, a damper switch connected to the damper resistor in parallel, and a delay circuit delaying a turn-on time of the damper switch by a predetermined initial period from a turn-on time of the dimmer. | 11-22-2012 |
20120299493 | DIMMING ANGLE SENSING CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a dimming angle sensing circuit and a driving method thereof. | 11-29-2012 |
20120306394 | SWITCHING POWER SUPPLY CIRCUIT, SEMICONDUCTOR DEVICE, AND LED LIGHTING DEVICE - A switching power supply circuit includes a full-wave rectification circuit that performs full-wave rectification of an AC input voltage so as to generate a primary voltage, a transformer that transforms the primary voltage into a secondary voltage utilizing electromagnetic induction between first and second isolated windings, a rectifying and smoothing circuit that generates a DC output voltage from the secondary voltage so as to supply the DC output voltage to a load, a primary current control circuit that performs on/off control of primary current based on a result of comparison between a primary current detection voltage corresponding to the primary current flowing in the first winding and a first reference voltage, and a reference voltage correction circuit for monitoring an on-duty ratio of secondary current flowing in the second winding so as to correct the first reference voltage. | 12-06-2012 |
20120306395 | HID LIGHTING SYSTEM - A low-cost HID lighting system ( | 12-06-2012 |
20120313538 | DIMMING BALLAST FOR ELECTRODELESS LAMP - A ballast to energize a lamp at a selected lighting level is provided. The ballast includes a rectifier, a buck converter, and a controller. The rectifier produces a DC voltage with a substantially constant magnitude. The buck converter generates a lamp voltage output from the DC voltage based on a duty cycle. The output has a magnitude that is varied based on the duty cycle to energize the lamp at a selected lighting level. The controller receives a dim input signal indicating the selected lighting level, and provides an appropriate control signal to the buck converter. The appropriate control signal indicates a particular duty cycle corresponding to magnitude of the output to produce the selected lighting level. In response to receiving the control signal, the buck converter adjusts the duty cycle accordingly, producing the output having the magnitude to energize the lamp at the selected lighting level. | 12-13-2012 |
20120313539 | BALLAST WITH CONTROL DEVICE FOR CONTROLLING THE OPEN-CIRCUIT VOLTAGE - A ballast which controls the open-circuit voltage of the ballast. The ballast includes a power factor corrector (PFC) for receiving an AC input voltage and converting the AC input voltage into a power factor corrected DC voltage; a DC/DC converter connected to the PFC and having a switch placed at a low-voltage side of the DC/DC converter for converting the DC voltage of the PFC into a DC output voltage according to the switching operation of the switch; a controller connected to a control terminal of the switch of the DC/DC converter for sending a switching control signal to control the switch; and an open-circuit voltage controller for detecting a voltage associated with the open-circuit voltage of the ballast and regulating the duty ratio or pulse density or switching frequency of the switching control signal in response to the results of the detection, thereby controlling the open-circuit voltage. | 12-13-2012 |
20120319604 | CASCADE BOOST AND INVERTING BUCK CONVERTER WITH INDEPENDENT CONTROL - A converter system including a cascade boost converter and inverting buck converter and controller for converting a rectified AC voltage to a DC output current. The system uses inductors and is configured to use a common reference voltage. The controller is configured to control switching of the converters in an independent manner to decouple operation from each other. For example, control pulses for the boost converter may be wider than pulses for the buck converter. The controller may control the boost converter based on constant on-time control and may control the inverting buck converter based on peak current control. The rectified AC voltage may be an AC conductive angle modulated voltage, where the controller may inhibit switching of the inverted buck converter at a dimming frequency having a duty cycle based on a phase angle of the AC conductive angle modulated voltage. | 12-20-2012 |
20120326614 | LUMINAIRE - According to one embodiment, a luminaire includes a dim lighting circuit, an emergency unit, a dimming-signal input section, and a dimming control circuit. The dim lighting circuit dimly lights a light source at a dimming ratio corresponding to a dimming signal. The emergency unit includes a charging circuit for charging a battery with an external power supply in a normal time and supplies a power supply of the battery to the dim lighting circuit in an emergency. The dimming-signal input section receives the input of the dimming signal from the outside. The dimming control circuit gives the dimming signal input from the dimming-signal input section to the dim lighting circuit in a normal time and gives a dimming signal having a dimming ratio for an emergency to the dim lighting circuit in an emergency. | 12-27-2012 |
20120326615 | CURRENT CONTROL CIRCUIT AND ASSOCIATED METHOD - A current control circuit and associated method are disclosed hereby. The current control circuit has a fly-wheel circuit, comprising an inductor, a rectifier and a load; a current sense circuit, detecting a load current, configured to generate a first current signal; a compensating circuit, generating a compensating signal; a control circuit, generating a control signal according to the first current signal and the compensating signal; a first switch, coupled to the fly-wheel circuit, turned ON and OFF according to the control signal. By the effect of the compensating signal, the drift error of the average load current is prohibited. | 12-27-2012 |
20130002159 | CONTROLLING CIRCUIT FOR AN LED DRIVER AND CONTROLLING METHOD THEREOF - The present invention relates to a high efficiency light-emitting diode (LED) driver that can include a controller, an LED apparatus, an LED current sensing circuit, and a power switch. The LED current sensing circuit may be used to generate a feedback signal indicative of LED current. The controller may be coupled to the LED current sensing circuit to receive the feedback signal and generate a driving signal. The power switch may be used to operate in periodic on and off conditions to drive the LED apparatus and maintain a driving current of the LED apparatus that is substantially constant. | 01-03-2013 |
20130002160 | Switching Power Supply and Luminaire - A switching power supply includes a first switching element, a rectifying element, a first inductor and a second inductor. The first switching element supplies a power supply voltage to the first inductor and al lows a current to flow when the first switching element is on. The rectifying element is connected in series to the first switching element, and allows a current of the first inductor to flow when the first switching element is turned off. The second inductor is electromagnetically coupled to the first inductor, a potential to turn on the first switching element is induced when the current of the first inductor increases, and a potential to turn off the first switching element is induced when the current of the first inductor decreases. The induced potential is supplied to a control terminal of the first switching element. The rectifying element includes a diode and a second switching element. | 01-03-2013 |
20130002161 | LIGHT EMITTING ELEMENT DRIVING CIRCUIT - A light emitting element driving circuit comprising: a rectifying circuit; a voltage-dividing circuit; a transistor increasing or reducing a driving current of a light emitting element according to turning on or off a rectified voltage; a control circuit bringing the transistor to an on or off state at predetermined intervals and bringing the transistor to the other state when a voltage according to a current flowing through the transistor increases and becomes the reference voltage being divided voltage obtained by dividing the rectified voltage; and a voltage-dividing ratio adjustment circuit to set a voltage-dividing ratio of the voltage dividing circuit as a first voltage-dividing ratio to reduce the reference voltage when an amplitude of the rectified voltage is larger than predetermined amplitude and to set the voltage-dividing ratio as a second voltage-dividing ratio to increase the reference voltage when an amplitude of the rectified voltage is smaller than predetermined amplitude. | 01-03-2013 |
20130020953 | DISCHARGE LAMP SYSTEM AND CONTROLLING METHOD OF THE SAME - A discharge lamp system includes a discharge lamp; a power supply device for providing DC input voltage and current; a converter connected to the discharge lamp and the power supply device for providing power for the discharge lamp; a DC input voltage detecting unit connected to the power supply device for detecting the DC input voltage; a DC input current detecting unit connected to the power supply device for detecting the DC input current; a lamp state detecting unit for detecting a signal responsive to the lamp state; a controller connected to the converter, the DC input voltage detecting unit, the DC input current detecting unit and the lamp state detecting unit for controlling the discharge lamp according to the signal responsive to the lamp state, the DC input voltage and the DC input current. A controlling method for the discharge lamp system is also disclosed herein. | 01-24-2013 |
20130020954 | DISCHARGE LAMP SYSTEM AND CONTROLLING METHOD OF THE SAME - A discharge lamp system includes an AC power source, a rectifier, a power factor correction (PFC) circuit, a half-bridge circuit, and a controller. The AC power source provides an AC power. The rectifier converts the AC power into a DC power. The PFC circuit is electrically coupled to the rectifier and is configured for generating an output voltage. The half-bridge circuit is electrically coupled to the PFC circuit and a discharge lamp, and is configured for converting the output voltage into a voltage required by the discharge lamp. The controller is electrically coupled to the PFC circuit and the half-bridge circuit, and includes a timer for counting time, in which the controller controls the output voltage of the PFC circuit in accordance with a time period counted by the timer. | 01-24-2013 |
20130038229 | LIGHT-EMITTING DEVICE CONTROL CIRCUIT - In a control circuit for a light-emitting device, a reference voltage generation circuit detects a full-wave rectified voltage and generates a first voltage as well as generating a second voltage by converting the rectified voltage into a DC voltage. A voltage corresponding to a difference between the first voltage and the second voltage or a voltage corresponding to a ratio of the first voltage to the second voltage is generated as a reference voltage by a subtraction circuit or by a division circuit, respectively. As a result, a change in amplitude of the reference voltage can be suppressed when amplitude of the rectified voltage is varied due to a variation in an AC input voltage supplied from an AC power supply. | 02-14-2013 |
20130049617 | LOAD COMPENSATION FOR AN ELECTRONIC TRANSFORMER IN A LED ILLUMINATION SYSTEM - The invention relates to a light emitting diode (LED) illumination system, and more particularly, to systems, devices and methods of rapidly ramping up a transformer current and a LED driver current by coupling a transformer load compensation circuitry to an output of an electronic transformer. A bridge rectifier is coupled to the electronic transformer and provides full-wave rectification to an AC supply at the output of the electronic transformer. The load compensation circuitry senses the rectified AC supply and compensates the load of the electronic transformer, such that the electronic transformer starts up properly when the level of the signal envelope is below a threshold voltage. Therefore, the load compensation circuit is active for a programmed time during which the LED driver current has been increased to a sufficient value to keep the electronic transformer operational. | 02-28-2013 |
20130049618 | ADAPTIVE CIRCUIT - The invention describes an adaptive circuit ( | 02-28-2013 |
20130057167 | DAMPER CIRCUIT FOR SWITCHED DIMMING - A power converter includes dimmer circuit, a rectifier circuit, and a thyristor damper circuit. The dimmer circuit provides a dimmer voltage in response to an input voltage. The rectifier circuit provides a rectified voltage in response to the dimmer voltage. The thyristor damper circuit dampens an input current associated with the rectified voltage based on the input current and ceases dampening the rectified voltage based on the rectified voltage. | 03-07-2013 |
20130057168 | Lighting Systems - A power adaptor for a solid state light source is disclosed. The power adaptor comprises an input ( | 03-07-2013 |
20130057169 | FLICKERING SUPPRESSOR SYSTEM FOR A DIMMABLE LED LIGHT BULB - A flicker suppression system for a dimmable LED bulb. In one embodiment, the system includes a rectifier circuit having input terminals and output terminals. The rectifier circuit is configured to rectify a line voltage to generate a rectified voltage at its output terminals. A resistor and switch are also included and coupled in series. A switch control circuit is directly coupled between the output terminals and configured to control the switch only as a function of the rectified voltage. | 03-07-2013 |
20130057170 | AC/DC CONVERTER HAVING A SWITCHABLE PFC, A CONTROLLER THERFOR, AND A METHOD OF OPERATING A CONTOLLER - A method of controller an AC/DC to converter is disclosed, the converter having a power factor correction stage and a signal indicative of a required power and operating with a switching cycle having a switching frequency being the inverse of a switching period. The method comprises switching on the PFC stage, in response to a signal indicative of an average switching frequency rising above a first threshold. The method further comprises switching off the PFC stage, in response to the signal indicative of an average switching frequency falling below a second threshold. The method may further comprise switching on the PFC stage, in response to a positive step change in the signal indicative of a required power, and switching off the PFC stage, in response to indicative step change in the signal indicative of a required power. | 03-07-2013 |
20130057171 | LOW CURRENT SOLUTION FOR ILLUMINATED SWITCHES USING DC OPERATED LEDS - A switch circuit utilizes an LED for illumination. A diode is connected in parallel with the LED but in opposite orientation, with the LED anode connected to the diode cathode, and the LED cathode connected to the diode anode, to permit discharging of a power supply capacitor of a ballast of a lamp such as a compact fluorescent light (CFL) bulb. Undesirable flickering of the CFL are then avoided. | 03-07-2013 |
20130063037 | Electronic Ballast for a High Intesity Discharge Lamp - An electronic ballast includes a power factor corrector having an input side for receiving an AC input voltage from a voltage source, and including first and second power switches connected in series across an output side. Each of the first and second power switches is operable based on a corresponding one of a first and second control signals in one of an ON-state and an OFF-state. The power factor corrector is operable to output at the output side a boosted DC voltage output corresponding to the AC input voltage in response to operation of the first and second power switches. A buck circuit receives the boosted DC voltage output from the power factor, and is operable based on the boosted DC voltage output to output an AC voltage output in the form of an AC square wave signal to a high intensity discharge lamp. | 03-14-2013 |
20130069548 | Switching Power Supply, Luminaire, and Control Method for the Luminaire - A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit. | 03-21-2013 |
20130069549 | LED Light For Examinations And Procedures - A light is provided having a base unit, an arm extending from the base unit, and a lamp head coupled to the arm. The lamp head includes an LED configured to provide light based on an input drive current, an optical mixing element configured to collect the light produced by the LED and a zoom lens configured to adjust an output size of a spot generated by the light collected in the mixing element. A controller receives DC power from the base unit through the arm. The controller is configured to set the input drive current for the LED to control an output light density of the spot in response to an operator selected input and configured to adjust the output light density of the spot in response to a change in the size of the spot. | 03-21-2013 |
20130076255 | LIGHT EMITTING DIODE LIGHTING APPARATUS - A light emitting diode (LED) lighting apparatus boosts alternating current (AC) power output from a ballast, rectifies the boosted AC power to direct current (DC) power, blocks generation of an inrush current while the boosted AC power is rectified, and controls an operation of an LED by using the DC power. | 03-28-2013 |
20130088161 | DRIVING CIRCUIT OF LIGHT EMITTING DIODE - A driving circuit of a light emitting diode (LED) including an AC power, a rectifier, a power converter, a waveform sampler, and a control circuit is provided. The AC power provides an AC signal. The rectifier is coupled to the AC power and outputs a driving signal. The power converter is coupled to the rectifier. The power converter includes an LED and outputs a first signal positive correlated with a current passing through the LED. The waveform sampler is coupled between the AC power and the rectifier, and outputs a second signal directly proportional to the AC signal. The control circuit is coupled between the waveform sampler and the power converter, and outputs a control signal to the power converter according to a comparison result between the first signal and the second signal. | 04-11-2013 |
20130093341 | AC LED DIMMER AND DIMMING METHOD THEREBY - The disclosure relates to an AC LED dimmer and dimming method thereof. The AC LED dimmer includes a rectifier receiving AC voltage from an AC voltage source and full-wave rectifying the AC voltage; a direct current (DC)/DC converter receiving the full-wave rectified voltage from the rectifier, generating a full-wave rectified stepped-up voltage, and generating a pulse enable signal; a pulse width modulation controller receiving the full-wave rectified stepped-up voltage and generating a pulse width modulation signal to dim an AC LED in response to the pulse enable signal; a switch driving the AC LED under control of the pulse width modulation signal, and an electromagnetic interference (EMI) filter to be connected between the AC voltage source and the switch to eliminate electromagnetic interference from the AC voltage source. Accordingly, the dimmer can perform an efficient and linear dimming function and suppress harmonics. | 04-18-2013 |
20130099688 | CONTINUOUS DIMMING AC LED DEVICE - A continuous dimming AC LED device is operated in association with a dimmer. When the dimmer adjusts brightness, the voltage supplied to the AC LED driver is reduced to decrease the brightness of an LED unit. When the supplied voltage is reduced to a working voltage required by the AC LED driver, a control unit detects the supplied voltage being lower than the working voltage, A control end of a voltage-controlled switch disconnects from the AC LED driver and connects to a power supply. Therefore, even the supply voltage is below the working voltage of the AC LED driver, the LED unit is prevented from being immediately turned off to maintain some brightness. With the dimmer, the brightness of the LED continuously and gradually. changes from full brightness to darkness, | 04-25-2013 |
20130106301 | LIGHT SOURCE AND LIGHTING DEVICE INCLUDING THE SAME | 05-02-2013 |
20130113386 | LED Current Control In A Dimmable LED Illumination System - The invention relates to a light emitting diode (“LED”) illumination system, and more particularly, to systems, devices and methods of driving a LED module by a current generator that is powered and controlled by a regulated dc voltage associated with a brightness level. Such a dimmable LED illumination system is compatible with both a high-voltage ac signal coupled from any wall outlet and a low-voltage ac signal provided by an electronic transformer. A diode bridge rectifies the ac signal to a rectified ac signal, and a LED driver generates the LED current from the rectified ac signal and drives the LED to the brightness level. Within the LED driver, the level of the LED current is determined from a boost voltage that is substantially a regulated dc voltage generated from the rectified ac signal. | 05-09-2013 |
20130119878 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectification circuit, a smoothing capacitor, a waveform shaping circuit, and a DC-DC converter. The rectification circuit rectifies an AC voltage input thereto. | 05-16-2013 |
20130119879 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectifying circuit, a smoothing capacitor, a reference voltage generating circuit, and a DC-DC converter. The rectifying circuit rectifies an AD voltage input thereto. The smoothing capacitor smoothes an output from the rectifying circuit. The reference voltage generating circuit generates a reference voltage on the basis of at least any one of an output voltage of the rectifying circuit and a voltage from the smoothing capacitor. The DC-DC converter includes an output element and a constant current element, and converts the voltage of the smoothing capacitor. The output element receives a supply of a voltage of the smoothing capacitor, oscillates by performing a switching operation which repeats an ON state and an OFF state when the reference voltage is relatively high, and continues the ON state when the reference voltage is relatively low. | 05-16-2013 |
20130127355 | STARTING CIRCUIT FOR BUCK CONVERTER - A ballast to energize a lamp is provided. The ballast comprises a buck converter connected to an inverter via a switching component. The buck converter includes a transistor, a capacitor, a diode, and an inductor. The switching component has a predetermined breakover voltage value and is configured to provide a start up signal to the inverter when voltage at the switching component increases to the predetermined breakover voltage value. A control circuit is configured to monitor the voltage at the switching component while the voltage at the switching component increases to the predetermined breakover voltage, and is configured to generate a gate drive pulse at a gate terminal of the transistor when the voltage at the switching component reaches a predetermined voltage that is less than the breakover voltage of the switching component. | 05-23-2013 |
20130127356 | LED DRIVING POWER SUPPLY APPARATUS AND LED LIGHTING APPARATUS - An LED driving power supply apparatus and an LED lighting apparatus is provided in which stable dimming is realized even when dimming is performed in a range that includes a light-off state. A power conversion control circuit controls the on time or switching period of a switching device in accordance with a feedback control signal input through an insulating member, operates as a PFC converter, and controls power supplied to the LED. A dimming control circuit includes a constant current control circuit, a constant voltage control circuit, and an OR gate circuit. When the external dimming signal is a signal specifying normal lighting, the constant current control circuit maintains a current supplied to the LED at a target current. When the external dimming signal is a signal specifying a minimum luminance, the constant voltage control circuit maintains a voltage applied to the LED at a target voltage. | 05-23-2013 |
20130127357 | POWER FACTOR CORRECTION CIRCUIT OF AN ELECTRONIC BALLAST - This invention relates to a power factor correction circuit of an electronic ballast. The electronic ballast includes a rectification circuit, a first capacitive element and an inverter. The power factor correction circuit comprises a unidirectional element, an inductive element and a second capacitive element. The unidirectional element is connected in series with the inductive element, and the second capacitive element is connected in parallel with the unidirectional element and the inductive element. A junction of the unidirectional element and the second capacitive element is coupled to a first output terminal of the rectification circuit, a junction of the inductive element and the second capacitive element is coupled to an input terminal of the inverter, and the first capacitive element is coupled between a second output terminal of the rectification circuit and a junction of the unidirectional element and the inductive element. It was found that a power factor correction circuit according to an embodiment of the present invention can increase the power factor of an electronic ballast to a high value, such as 0.98, while the size of the power factor correction circuit is small enough to be implemented in a small size lamp. | 05-23-2013 |
20130134890 | Arc Extinction Arrangement and Method for Extinguishing Arcs - In a method for extinguishing an arc in a gas discharge chamber in which power is supplied to a gas discharge chamber and in which both with a current flow in a first direction and with a current flow in a second inverse direction there is produced a gas discharge, when an arc is identified, the power supply to the gas discharge chamber is interrupted, and residual energy which is in a supply line to the gas discharge chamber and/or in the gas discharge chamber is supplied to an energy store. | 05-30-2013 |
20130140999 | METHODS AND APPARATUS FOR DRIVING LIGHT EMITTING DIODES (LEDS) COMPRISING PARALLEL FLYBACK CONVERTER STAGES - An apparatus ( | 06-06-2013 |
20130147376 | EMERGENCY LIGHTING SYSTEMS INCLUDING BIDIRECTIONAL BOOSTER/CHARGER CIRCUITS - An emergency lighting module for providing emergency power to a solid state luminaire is provided. The emergency lighting module includes a control circuit configured to detect a line voltage, a first input configured to receive an input voltage from the solid state luminaire, and a bidirectional booster/charger circuit coupled to the microcontroller and configured to charge a battery using the input voltage. The bidirectional booster/charger circuit is further configured to provide an output voltage. The emergency lighting module is configured to provide the output voltage to the solid state luminaire in response to a reduction of the line voltage. | 06-13-2013 |
20130154491 | EFFICIENCY REGULATION FOR LED ILLUMINATION - Various embodiments of the present invention relate to a switch-mode regulator, and more particularly, to systems, devices and methods of using a switch-mode regulator to regulate an LED current to improve overall LED system efficacy and suppress power consumption of a dimmable LED illumination system. Both high and moderate brightness modes are implemented in an LED driver based on the switch-mode regulator. In the high brightness mode, the LED current is larger than a preferred LED current. In the moderate brightness mode, the LED current is smaller than the preferred LED current, and the LED driver sustains the preferred driver efficiency while the LED current remains as a direct current. Such a switch-mode power supply or regulator may also be used in applications other than the LED illumination system. | 06-20-2013 |
20130154492 | Improvements relating rectifier circuits - A rectifier circuit is disclosed comprising input terminals adapted to receive an alternating current voltage, and output terminals adapted to provide an output having a rectified output voltage. The rectifier circuit has a diode bridge in which the diodes are each adapted to be by-passed by a low-impedance path on activation of an associated electronic switching device (Q | 06-20-2013 |
20130162154 | DRIVING APPARATUS FOR LIGHT EMITTING DIODE - There is provided a driving apparatus for a light emitting diode (LED) comparing a rectified power voltage level with an LED current to limit current applied to an LED, thereby reducing the amount of heat generated therein. The driving apparatus for an LED includes a detecting unit detecting a voltage level of rectified power; and a driving unit comparing a level of current flowing in an LED unit having at least one LED with detection results from the detecting unit, and limiting current applied to the LED unit to drive the LED unit according to comparison results. | 06-27-2013 |
20130162155 | LIGHTING CIRCUIT AND ILLUMINATION DEVICE - A lighting circuit according to embodiments includes: a self-hold element connected in series to an AC power source that generates power for lighting an illumination load, together with the illumination load, the self-hold element being configured to control supply of the power provided by the AC power source to the illumination load by the self-hold element being turned on/off; a noise prevention circuit connected in parallel to the self-hold element; and a damping circuit configured to connect a damping resistance to the noise prevention circuit parallely only for a predetermined period from turning-on of the self-hold element, thereby preventing the self-hold element from being repeatedly turned on/off during a period in which the self-hold element is on under normal conditions, due to a transient during power supply. | 06-27-2013 |
20130169176 | NON-ISOLATED AC/DC CONVERTER WITH POWER FACTOR CORRECTION - A non-isolated AC/DC converter having power factor correction, comprising an active switch connected to a waveform controller for control, and sequentially showing conduction, cut off, making the alternating current power supply pass through one circuit rectifier for rectifying and forming one positive half sine wave electricity supply, which passes through a voltage step-down circuit to proceed with decreasing the voltage, then passing through a filter/storage circuit for filtering and forming direct current power supply, which is stored on this filter/storage circuit, then releasing the energy and supplying electricity to the electricity end; as a transformer isn't required, the circuit volume can be reduced, lowering costs, raising circuit conversion rates and achieving power factor correction and increasing the lifespan of the transformer, moreover, through the waveform controller controlling the output waveform, the storage circuit utilizes a lower capacity capacitor to avoid using an electrolytic capacitor, thereby increasing the circuits lifespan. | 07-04-2013 |
20130169177 | Active Bleeder Circuit Triggering TRIAC in All Phase and Light Emitting Device Power Supply Circuit and TRIAC Control Method Using the Active Bleeder Circuit - The present invention discloses an active bleeder circuit capable of triggering a tri-electrode AC switch (TRIAC) circuit in all phase. The active bleeder circuit receives a rectified signal having an OFF phase and an ON phase. The active bleeder includes: a detection circuit for generating a detection signal according to the rectified signal and accumulating the detection signal in the OFF phase of the rectified signal; and a current sinker circuit coupled to the detection circuit, for generates a latching current to trigger the TRIAC circuit by operating a switch when the detection signal exceeds a predetermined level. The present invention also discloses a light emitting device power supply circuit and a TRIAC control method using the active bleeder circuit. | 07-04-2013 |
20130175936 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver and driving method thereof. In one embodiment, a high efficiency LED driving method configured for a LED device can include: (i) receiving a DC bus voltage and generating a driving voltage for the LED device through a power switch; (ii) comparing the DC bus voltage against a sum of the driving voltage and a first reference voltage; (iii) where when the DC bus voltage is greater than the sum of the driving voltage and the first reference voltage, generating a first output current; (iv) where when the DC bus voltage is greater than the driving voltage and less than the sum of the driving voltage and the first reference voltage, generating a second output current; and (v) matching an average current of the first output current and the second output current with a corresponding driving current. | 07-11-2013 |
20130175937 | WIRELESS POWER SUPPLY SYSTEM FOR LIGHTING AND LIGHTING APPARATUS - A wireless power supply system for lighting includes: a power transmission unit including a power transmission coil; and a power reception unit including a power reception coil. The power transmission coil generates an AC magnetic field in response to a supplied AC power. The power reception coil receives an electric power from the power transmission unit through an electromagnetic induction due to the AC magnetic field generated by the power transmission coil. The power reception unit further includes a power circuit and a receive-side control section. The power circuit receives an output power from the power reception coil and to perform Buck-Boost operation so as to output a predetermined electric power to a lighting load. The receive-side control section controls the Buck-Boost operation of the power circuit. The power circuit is configured to be capable of boosting and stepping-down of the output power from said power reception coil. | 07-11-2013 |
20130181624 | FEED FORWARD IMBALANCE CORRECTOR CIRCUIT - A circuit includes a first active device is coupled between a third terminal and a second terminal. The first active device has a control terminal coupled a first terminal to receive a signal representative of a rectified input voltage. A second active device is coupled between the control terminal of the first active device and the second terminal. The second active device has a control terminal coupled to a fourth terminal. The second active device is coupled to be controlled in response to a bypass voltage at the fourth terminal. The first active device is coupled to be controlled in response to the rectified input voltage and the bypass voltage. | 07-18-2013 |
20130181625 | SINGLE STAGE ELECTRONIC BALLAST WITH POWER FACTOR CORRECTION - A single stage electronic ballast with power factor correction is provided. The single stage electronic ballast can work under the present intensity discharge lamp without any change and provide higher efficient, lower power consumption of lighting system, and better lighting quality of lamps. The single stage electronic ballast can also provide a stable current to load (lamp) for a long time. The single stage electronic ballast includes a first switch and a second switch that are controlled with complementary switching so as to provide an output voltage in response to the input power source and the variation of the load. | 07-18-2013 |
20130181626 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver, and driving methods thereof. In one embodiment, a high efficiency LED driving method can include: (i) receiving an AC input voltage to obtain an absolute value thereof; (ii) receiving a DC bus voltage, and driving the LED device through a power switch; (iii) generating a first reference voltage according to a driving current and an expected driving current; (iv) comparing the absolute value against a sum of a driving voltage and the first reference voltage; (v) when the absolute value is greater than the sum of the driving voltage and the first reference voltage, turning off the power switch; and (vi) when the absolute value is greater than the driving voltage but less than the sum of the driving voltage and the first reference voltage, turning on the power switch to generate an output current. | 07-18-2013 |
20130187557 | MULTI-LEVEL ADAPTIVE CONTROL CIRCUITRY FOR DEEP PHASE-CUT DIMMING COMPACT FLUORESCENT LAMP - An electronic ballast has a rectifying circuit for rectifying an input voltage controlled by a phase dimmer. The electronic ballast has an averaging circuit for averaging current received from the rectifying circuit to produce a reference voltage. The electronic ballast has a control integrated circuit for providing an output current to a compact fluorescent lamp by performing a linear to logarithmic conversion of the reference current, according to a predefined conversion function. | 07-25-2013 |
20130187558 | Power Supply Circuit for Driving Light Emitting Diode - The present invention relates to a power supply circuit for driving at least one light emitting diode (LED). The power supply circuit comprises: an input unit, an active power factor corrector, a converter, an output unit and a feedback unit. The input unit is utilized to receive power signal from a power source, and the output unit is utilized to receive power transferred from the converter for driving at least one LED. The feedback unit couples to a node between the converter and the output unit, and delivers the power signal, from the converter to the output unit, back to the active power factor corrector. The active power factor corrector monitors the power signal based on the power signal from the feedback unit for stabilizing the outputting power from the output unit and thereby driving the LED. | 07-25-2013 |
20130193863 | Power Supply Device and Lighting Equipment Provided with Power Supply Device - A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal. | 08-01-2013 |
20130207561 | LED Light Tube and A Circuit Module for the Same - The invention relates to an LED light tube and a circuit module for the same, wherein the circuit is located in a light tube body and includes a rectifying unit, a current regulating and voltage regulating unit, and an LED unit. The light tube body can be installed in a lamp-holder of a fluorescent tube without changing a starter and a ballast. The rectifying unit has two power terminals connected to electrodes of the light tube body for receiving a mains power and the rectifying unit via the electrodes. The rectifying unit converts the mains power to a sign wave DC voltage. The current regulating and voltage regulating unit is connected to the rectifying unit for converting the mains power to a working power. The LED unit is electrically connected to the current regulating and voltage regulating unit for receiving the working power to emit light. | 08-15-2013 |
20130214692 | Method for transmitting control information from a control apparatus to an operating device for at least one light-emitting means and operating device for at least one light-emitting means - A method for transmitting control information from a control apparatus to an operating device for a light-emitting means may include a) modulating control information onto a supply line by means of the control apparatus during a modulation phase, wherein a switchable shunt of the device is connected between the first and second supply connections; b) decoding the control information in a decoder of the device; b1) activating the demodulation by the decoder when the absolute value for the voltage at the two supply connections falls below a first threshold value; and c) actuating a converter of the operating device in accordance with the decoded control information. | 08-22-2013 |
20130221862 | Method and System for Avoiding Flicker of SSL Devices - This disclosure relates to illumination systems. In particular it relates to a method and system for avoiding flicker (in particular 100 Hz or 120 Hz flicker) in solid state lighting devices such as LED or OLED assemblies. A controller for a driver circuit of a solid state lighting device (SSL) is described. The driver circuit comprises a power converter to convert a varying input voltage into a drive voltage for the SSL device. The input voltage is derived from a rectified AC mains voltage and frequency. The power converter is used with a maximum voltage step-up conversion ratio. The controller synchronizes to the mains frequency and determines a plurality of pulse intervals repeated at a pulse frequency where the pulse frequency is greater than a perceptual frequency of light intensity variations perceivable by a human eye. | 08-29-2013 |
20130221863 | GENERATOR SUITABLE FOR POWERING A DENTAL CURING LIGHT - The generator for a piezoelectric motor is also suitable for powering a high power LED for a dental polymerisation lamp via a rectifier, and comprises two transformers each including a primary winding and a secondary winding and four switches controlled by an ultrasonic reference oscillator, two switches being arranged to alternately connect the secondary windings of the two transformers to the piezoelectric load, and the other two switches being arranged to alternately connect the two primary windings to a voltage supply so that during the positive alternation, the primary winding of one of the transformers is charged with energy whereas the secondary winding of the other transformer is discharged into the piezoelectric load, and so that during the negative alternation, the secondary winding of the first transformer discharges the energy thereof whereas the primary winding of the first transformer is charged. | 08-29-2013 |
20130221864 | LED LIGHTING CIRCUIT, LED ILLUMINATION DEVICE, AND LED ILLUMINATION UNIT SOCKET - The purpose of the present invention is to provide an LED lighting circuit, which can normally light an LED even if an alternating current power supply is an electronic transformer, an LED illuminating device, and a socket for an LED illuminating unit. Disclosed is an LED lighting circuit includes a rectifier circuit for rectifying an AC output from an AC power supply, an LED drive unit, which drives the LED by having rectifying output inputted thereto from the rectifying circuit, a reverse current preventing unit, which is provided between the rectifying circuit and the LED drive unit, and a terminal voltage control unit, which reduces the output terminal voltage of the rectifying circuit in the case where the alternating current output from the alternating current power supply is unstable or stopped. Also provided are an LED illuminating device, and a socket for an LED illuminating unit. | 08-29-2013 |
20130229121 | POWER SUPPLY FOR ILLUMINATION AND LUMINAIRE - A power supply for illumination includes a detection circuit and a control circuit. The detection circuit compares an AC voltage whose phase is controlled with a first threshold voltage so as to detect a variation in a conduction state of phase control in the AC voltage, and compares the AC voltage with a second threshold voltage lower than the first threshold voltage so as to detect a zero-cross point of the AC voltage, thereby detecting a conduction period of the phase control. The control circuit outputs an output current according to the duration of the conduction period. | 09-05-2013 |
20130229122 | ILLUMINATION DEVICE INCLUDING LEDS AND A SWITCHING POWER CONTROL SYSTEM - Disclosed herein is an illumination device having at least one LED and a power converter with a switching element for connection to an existing fluorescent lamp fixture including a conventional ballast. The illumination device includes a feedback circuit operable to provide a switching signal to the switching element according to a duty cycle, the feedback circuit configured to: increase the value of the duty cycle to decrease an output current signal through the at least one LED; and decrease the value of the duty cycle to increase the output current signal through the at least one LED. | 09-05-2013 |
20130234612 | BLEND DIMMING CIRCUITS AND RELEVANT METHODS - The present disclosure relates to blend dimming circuits and methods for driving light loads. In one embodiment, a method can include: converting an external sinusoidal AC power supply to a phase-missing DC voltage signal; detecting a conduction angle of the phase-missing DC voltage signal to generate a first control signal representing the conduction angle; generating an analog dimming signal based on the first control signal; generating, by a PWM dimming circuit, a PWM dimming signal based on the analog dimming signal and a light load feedback signal; regulating light load brightness by PWM dimming when the conduction angle is greater than a threshold angle; regulating the light load brightness by PWM and analog dimming when the conduction angle is less than the threshold angle; and enabling a power stage circuit when the first control signal is active to regulate the brightness of the light load. | 09-12-2013 |
20130234613 | Power Conversion and Control Systems and Methods for Solid-State Lighting - A power conversion and control system suitable for use with solid-state lighting and conventional TRIAC dimmer switching includes an alternating current to direct current (AC-DC) converter configured to convert AC power from the AC mains to DC power and a controller configured to control dimming of a light-emitting load depending on the magnitude of a distorted AC voltage from an external TRIAC dimmer switch relative to the magnitude of the DC voltage Vdc produced by the AC-DC converter. To prevent the TRIAC in the external TRIAC dimmer switch from turning off in situations where the AC-DC converter is disconnected from the AC mains or not drawing any current from the AC mains, the power conversion and control system may further include circuitry that maintains the current through the TRIAC above its minimum holding current. | 09-12-2013 |
20130241424 | LED DIMMING DEVICE AND LED DIMMING AND DRIVING CIRCUIT - A LED dimming device, and a LED dimming and a driving circuit using such LED dimming device are discussed. In present embodiment, the LED dimming device multiplexes an inputting switch and/or a sampling module of the LED driving circuit for dimming. such LED dimming device will not affect the sine waves of input current, in such a way, power factor and work efficiency will be increased while the harmonic coefficient and interference signal will be reduced. | 09-19-2013 |
20130241425 | LED DRIVER CIRCUIT - In order to supply power and control the power supplied to an LED ( | 09-19-2013 |
20130241426 | LED LIGHT COMPRISING AN INTEGRATED DRIVER - Disclosed is an LED light comprising at least one LED ( | 09-19-2013 |
20130257301 | COMPACT, CONFIGURABLE POWER SUPPLY FOR ENERGIZING OZONE-PRODUCING CELLS - Improvements in the supply of high-frequency electrical power to ozone-producing cells can be accomplished using the systems and techniques described herein. Application of a DC-DC converter operating at a switching frequency substantially greater than a load frequency, supports generation of a high-voltage AC for powering such cells, while allowing for reductions in component size and reductions in a quality factor of a load tuning circuit. Controllable power inverters used in obtaining one or more of the switching and load frequencies can be controlled using feedback techniques to provide stable, high-quality power to ozone-producing cells under variations in one or more of externally supplied power and load conditions. An inrush protection circuit can also be provided to selectively introduce a current-limiting resistance until an input DC bus has been sufficiently initialized as determined by measurements obtained from the DC bus. The current limiting resistance can be a positive-temperature coefficient thermistor. | 10-03-2013 |
20130257302 | DIMMER COMPATIABLE LED BULB DRIVER CIRCUIT - A light-emitting diode (LED) bulb for use with a leading-edge dimmer includes a shell and an LED contained within the shell. A base is attached to the bulb for connecting the LED bulb to an electrical socket. A driver circuit is configured to provide current to the LED. The driver circuit has an input filter circuit that includes a first inductor. In response to the input filter receiving a switched AC voltage from a leading-edge dimmer set to dim at 50%, the first inductor is configured to saturate. In response to an undimmed AC voltage from the leading-edge dimmer, the first inductor is configured to not saturate. The input filter also includes a bridge rectifier connected to the first inductor. | 10-03-2013 |
20130264959 | Lighting Device - To provide a lighting device in which the luminance of an EL element is maintained even when the EL element deteriorates so that degradation of the lighting device is reduced, the lighting device includes a surface light source portion including an organic EL element, and a control circuit portion provided in a base portion. The control circuit portion counts a lighting time of the organic EL element and controls the luminance of the organic EL element in accordance with the lighting time. Accordingly, the lighting device in which the luminance of an EL element is maintained regardless of degradation of the EL element so that degradation of the lighting device is reduced can be provided. | 10-10-2013 |
20130278159 | BLEEDER CIRCUIT FOR USE IN A POWER SUPPLY - A bleeder circuit for use in a power supply of a lighting system includes a first terminal to be coupled to a first input of the power supply. A second terminal is to be coupled to a second input of the power supply. An edge detection circuit is coupled between the first and second terminals of the bleeder circuit. The edge detection circuit is coupled to output an edge detection signal in response to an input signal between the first and second inputs. A variable current circuit is coupled to the edge detection circuit and coupled between the first and second terminals of the bleeder circuit. The variable current circuit is coupled to conduct a bleeder current between the first and second terminals of the bleeder circuit in response to the edge detection signal. | 10-24-2013 |
20130278160 | ILLUMINATION DEVICE WITH ADJUSTABLE LUMINANCE AND LUMINANCE ADJUSTMENT METHOD THEREOF - The present application relates to an illumination device having a light source module, a power supply module, a driving module, a control module and a start module. The driving module outputs a driving current to the light source module based on a power supply from the power supply module. The control module controls the magnitude of the driving current based on a first voltage signal generated by the power source module. After receiving the first voltage signal, the control module controls the driving module to steadily increase the driving current in a first stage output. After receiving the first voltage signal again, the control module controls the driving module to output a constant driving current equal to the driving current at the end of the first stage. | 10-24-2013 |
20130278161 | LED LIGHTING DEVICE USING BALLAST FOR FLUORESCENT LAMP - Disclosed is an LED lighting device using a ballast for a fluorescent lamp, the LED lighting device including: an LED part which includes at least one LED device; a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp; and a controller which receives an output signal of the rectifier and controls power transmitted from the ballast to the LED part. | 10-24-2013 |
20130293130 | High Efficiency 3-Way Halogen Lamp With Diode and Sidac Driven Single Filament Lamp - A 3-way halogen lamp selectively generates different first, second, and third light levels. A first terminal on the lamp base receives a first input voltage waveform when the first terminal is connected to a power source. A second terminal on the lamp base receives a second input voltage waveform when the second terminal is connected to the power source. A rectifier circuit is connected to the first terminal for receiving the first input voltage waveform and rectifying the first input voltage waveform to generate a first load voltage waveform. A switching circuit is connected to the second terminal for receiving the second input voltage waveform and phase clipping the second input voltage waveform to generate a second load voltage waveform. A single filament is connected to the rectifier circuit and the switching circuit, and is housed in a halogen capsule attached to the lamp base. | 11-07-2013 |
20130293131 | Solid State Semiconductor LED Replacement for Fluorescent Lamps - Various apparatuses and methods for replacing a fluorescent lamp with a non-fluorescent tube are disclosed herein. For example, some embodiments provide an apparatus for replacing a fluorescent lamp, including an electrical connector adapted to electrically connect to a fluorescent lamp fixture, a DC rectifier connected to the electrical connector, a voltage converter connected to the DC rectifier, and a non-fluorescent light source connected to the voltage converter. The DC rectifier, voltage converter and non-fluorescent light source are substantially contained within a housing that is physically configured to replace the fluorescent lamp in a fluorescent lamp fixture. | 11-07-2013 |
20130300303 | Constant Voltage Dimmable LED Driver - A constant voltage dimmable LED (Light Emitting Diode) driver is disclosed that is compatible with all types of dimmers, including conventional phase cut (TRIAC) dimmers, and behaves like a conventional constant voltage driver which can be connected to any size of LED load that has a matching voltage rating. The driver produces a continuous train of pulses for driving the LED load and obtains an averaged measure of the voltage at the AC input for controlling the duty cycle of the continuous train of pulses. Therefore, when the averaged measure of the voltage at the AC input is reduced by a dimmer, the duty cycle reduces, resulting in a dimmed LED. The driver can be created by adding a few components to a conventional wide input range AC-DC converter without or with very little modifications. | 11-14-2013 |
20130307425 | CONSTANT CURRENT CONTROL BUCK CONVERTER WITHOUT CURRENT SENSE - A light emitting diode (LED) controller provides constant current regulation for a converter circuit providing current to an LED. The LED controller senses an inductor voltage and determines an inductor reset time from the sensed inductor voltage. Based on the determined inductor reset time, a switch on time and a switch period, the LED controller generates a control signal modifying the state of a switch coupling the converter circuit to an input voltage. | 11-21-2013 |
20130307426 | POWER SUPPLY AND METHOD FOR ELECTRIC LIGHTING DEVICE - Disclosed herein are a power control system ( | 11-21-2013 |
20130313989 | HIGH EFFICIENCY LED DRIVERS WITH HIGH POWER FACTOR - The present invention relates to a high efficiency, high power factor LED driver for driving an LED device. In one embodiment, an LED driver can include: an LED current detection circuit coupled to the LED device, and configured to generate a feedback signal that represents an error between a driving current and an expected driving current of the LED device; a power stage circuit, where a first power switch terminal is coupled to a first input voltage, and a second power switch terminal is coupled to ground; and a control circuit configured to generate a control signal according to the feedback signal and a drain-source voltage of the power switch, where the control signal, in each switch period, turns on the power switch when the drain-source voltage reaches a low level, and turns off the power switch after a fixed time interval based on the feedback signal. | 11-28-2013 |
20130320871 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 12-05-2013 |
20130342121 | Luminaire - According to one embodiment, a luminaire includes a rectifying section configured to rectify a voltage of an alternating-current power supply, a power converting section configured to receive an input of an output voltage of the rectifying section and supply required output power to a lighting load, an output control section capable of controlling the operation and output electric energy of the power converting section, a dimming operation terminal device operated to thereby determine a dimming amount of the lighting load, a dimming control section formed to be capable of energizing the dimming operation terminal device and configured to create a dimming signal on the basis of an energizing electric signal that changes according to the dimming operation terminal device and transmit via a first electric insulating section a signal for controlling the output electric energy of the power converting section according to the dimming signal. | 12-26-2013 |
20130342122 | SWITCHING CURRENT CONTROL CIRCUIT, LED DIMMER SYSTEM, AND LED ILLUMINATION DEVICE - The switching current control circuit includes a switching pulse supply circuit, a comparator circuit, and analog circuit unit, a digital circuit unit, etc. The A/D converter ( | 12-26-2013 |
20130342123 | TRAILING EDGE DIMMER COMPATIBILITY WITH DIMMER HIGH RESISTANCE PREDICTION - In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one embodiment, the controller is capable of predicting an estimated occurrence of a trailing edge of a phase cut AC voltage and accelerating a transition of the phase cut AC voltage from the trailing edge to a predetermined voltage threshold. In at least one embodiment, the controller predicts an estimated occurrence of the trailing edge of the phase cut AC voltage on the basis of actual observations from one or more previous cycles of the phase cut AC voltage. | 12-26-2013 |
20140001971 | DIM MODE START FOR ELECTRODELESS LAMP BALLAST | 01-02-2014 |
20140001972 | MODULAR LIGHTING CONTROL | 01-02-2014 |
20140021873 | Power Transformation Apparatus Between DC Light Element and Ballast - A power transformation apparatus between DC light element and ballast includes a first fluorescent emulation module, a second fluorescent emulation module and a rectifier module; wherein the first fluorescent emulation module includes two input current terminals for electrically connecting to first set of AC output terminals of the ballast, the second fluorescent emulation module also includes two input current terminals for electrically connecting to second set of AC output terminals of the ballast; two input terminals of the rectifier module are electrically connected respectively to any output terminal of first set of AC output terminals and second set of AC output terminals. The rectifier module outputs a rectified DC to supply to the DC light element as a power source. | 01-23-2014 |
20140021874 | HIGH-EFFICIENCY LED DRIVER AND DRIVING METHOD - Disclosed are LED driver circuits, and methods of driving LED loads. In one embodiment, an LED driver can include: (i) an SCR coupled to an AC power supply, and configured to generate a DC voltage through a first rectifier circuit; (ii) a first stage conversion circuit having an isolated topology with power factor correction, where the first stage conversion circuit is configured to convert the DC voltage to a first output voltage; (iii) where the first stage conversion circuit includes a transformer having a primary side coupled to the DC voltage, and a secondary side coupled to the first output voltage through a second rectifier circuit; and (iv) a second stage conversion circuit having a non-isolated topology, where the second stage conversion circuit is configured to convert the first output voltage to an output current configured to drive an LED load based on a conducting angle of the SCR. | 01-23-2014 |
20140021875 | AUXILIARY POWER SUPPLY CIRCUIT OF TWO WIRE DIMMER - An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor ( | 01-23-2014 |
20140021876 | POWER CONVERTER - The present invention includes a first DC converter converting AC voltage, into DC voltage while correcting a power factor, and a second DC converter electrically isolating the first DC converter from an LED group load, and converting the DC voltage, into a predetermined DC voltage and supply the resultant voltage to the LED group load. The second DC converter includes a current detection circuit disposed on the secondary side, and detecting current flowing into the LED group load, an error amplifier amplifying an error between a detected current value detected and a reference current value, a signal transmission isolation element transmitting a control signal based on an output signal from the error amplifier, to the primary side, and a switching element transferring power to the secondary side through the transformer by being turned on/off according to the control signal. | 01-23-2014 |
20140028208 | LIGHT SOURCE ELECTRONIC TRANSFORMER - Apparatus and methods for a light source electronic transformer. In an embodiment, a lamp includes a light source and an electronic ballast. The electronic ballast includes a main power converter, a controllable starter circuit, a transformer, a ballast control integrated circuit (IC) connected to the controllable starter circuit and having an output connected to the transformer, and an IC power converter connected to the transformer and having an output connected to the ballast control IC. When the light source is to be switched ON, the controllable starter circuit receives power from the main power converter and provides a high energy output. The ballast control IC outputs a power control signal to the transformer that illuminates the light source and the transformer to provide supply power to the IC power converter. The electronic ballast is configured such that after the light source illuminates the controllable starter circuit powers OFF. | 01-30-2014 |
20140028209 | INTERFACE CIRCUIT AND INTERFACE METHOD - Disclosed is an interface circuit including a rectifier circuit, a detection circuit, a first circuit, and a second circuit. The rectifier circuit rectifies an AC voltage input between a pair of input terminals. The detection circuit detects the AC voltage and outputs the result as a detection voltage. The first circuit is controlled to be turned on or off on the basis of an input first control signal, to cause a first current to flow between the input terminals in an on state and to cut off the first current in an off state. The second circuit is controlled to be turned on or off on the basis of an input second control signal, to allow a second current greater than the first current to flow between the input terminals in an on state and to cut off the second current in an off state. | 01-30-2014 |
20140028210 | WALL-MOUNTABLE LUMINAIRE AND ASSOCIATED SYSTEMS AND METHODS - A wall-mountable luminaire may include interchangeable adapter plugs having first and second male connectors, the first of which connects electrically and mechanically to an external electrical socket, and the second of which connects electrically and mechanically to an on-board multi-standard socket. A power supply may detect a plurality of electrical power types received from the multi-standard socket, and may condition that input power to drive LEDs. Remote computing devices may transmit control data wirelessly to direct a controller to selectively operate the LEDs to form a modified distribution pattern. A housing assembly may support wall mounting of the luminaire, and trim assembly may define a cavity that provides aesthetic and protective cover for the components carried by the housing assembly. A method aspect of the invention details steps for operating the luminaire. | 01-30-2014 |
20140028211 | FLYBACK AC-TO-DC CONVERTER - Techniques and corresponding circuitry and drivers are disclosed for improving power factor (PF) and total harmonic distortion (THD) of a flyback power factor correction (PFC) topology operating in transition-mode. In one or more embodiments, the PF and THD are improved by correcting the on-time of the switching element of the flyback PFC topology to actively shape the wave of the PFC input current. In some embodiments, the on-time is corrected using a phase-lock-loop module that synchronizes with the rectified input line voltage signal and a output regulator module that corrects the switch on-time. The control may be implemented using a digital or an analog controller. | 01-30-2014 |
20140035474 | HIGH EFFICIENCY LED DRIVER CHIP AND DRIVER CIRCUIT THEREOF - Disclosed is a high-efficiency LED driver chip and a driver circuit of the chip, and the driver chip includes a detection unit, a comparison unit and a correction unit. The LED detection unit detects the operating current of the LED driver circuit by an external sensing resistor and an internal current mirror to output a setup signal, and the comparison unit detects the driving current of at least one LED by an external comparing resistor to output an initialization signal, so that the correction unit can output a correction signal according to the setup signal and the initialization signal to reduce the power loss of the circuit while maintaining the driving current constant, so as to improve the illumination quality and the service life of the LED. | 02-06-2014 |
20140035475 | CONTROLLER OF AN AC-DC CONVERTER FOR LED LIGHTING - The present invention relates to a controller of an AC-DC converter, which controls an LED lighting using electricity of AC 100V to 250V which is used in a building or home, and more particularly, to a controller of an AC-DC converter for LED lighting, which is capable of effectively controlling brightness of an LED lighting. | 02-06-2014 |
20140042921 | AC/DC CONVERTER CIRCUIT - There is disclosed an AC/DC converter circuit. The circuit comprises: an input terminal for receiving an AC supply voltage; a driver circuit adapted to supply a DC drive current or voltage to an output of the circuit based on a signal provided to a control terminal of the driver circuit; and an AC coupling network connected between the input terminal and the control terminal of the driver circuit. The AC coupling network is adapted to derive a signal from an AC supply voltage received by the input terminal and to supply the derived signal to the control terminal of the driver circuit. | 02-13-2014 |
20140049173 | LED CONTROLLER CIRCUIT - An LED controller circuit for use in an LED drive circuit in which a coil current control scheme is used to deliver power to an LED arrangement from a phase cut dimmer. The controller circuit includes means for determining, based on an analysis/signal processing of the on-time of the transistor, the dimmer characteristics, including the on state and off states of the ac dimmed voltage signal. This avoids the need for the controller circuit to process the dimmer output. | 02-20-2014 |
20140049174 | DRIVING DEVICE AND METHOD FOR DRIVING A LOAD, IN PARTICULAR AN LED ASSEMBLY - Driver device and a corresponding driving method for driving a load, in particular an LED assembly comprising one or more LEDs. To provide a better performance, better cost-efficiency, improved power factor and reduced losses, a driver device ( | 02-20-2014 |
20140055052 | Solid State Lightening Driver with Mixed Control of Power Switch - In order to control of dimming of solid state lighting devices (SSL) a driver circuit drives the SSL subject to an input voltage using a phase-cut dimmer. The driver circuit comprises a transistor operable in two modes, either alternating between on/off states or continuously controlling a current through the transistor. A power converter network provides a switched-mode power converter in conjunction with the transistor when operated in the first mode generating a drive voltage for the SSL. The control unit controls the transistor to selectively operate in one of the two modes; to control the transistor to determine that the input voltage exceeds an input voltage threshold; and to control a drive current through the SSL based on a measurement of a phase-cut angle thereby controlling an illumination level of the SSL device. | 02-27-2014 |
20140062322 | CONTROLLED-SILICON ADAPTING LED DRIVING CIRCUIT, METHOD AND SWITCH MODE POWER SUPPLY - Disclosed are light-emitting diode (LED) driver circuits, methods, and a switch mode power supply. In one embodiment, an LED driver can include: (i) a silicon-controlled rectifier (SCR) and a rectifier bridge configured to receive an AC voltage, and to generate a phase-loss half sine wave voltage signal; (ii) a threshold voltage control circuit configured to receive a threshold voltage and an input voltage signal that represents the phase-loss half sine wave voltage signal, and to determine whether to output the threshold voltage based on angle information of the input voltage signal; (iii) a first control circuit configured to compare the input voltage signal against the threshold voltage output by the threshold voltage control circuit, and to generate a first control signal; and (iv) a power switch controllable by the first control signal to be off until an absolute value of the AC voltage is reduced to zero. | 03-06-2014 |
20140062323 | Linear Light-Emitting Diode Driving Circuit with Voltage-Lowering Serial Capacitor - A linear light-emitting diode (LED) driving circuit with voltage-lowering serial capacitor has a rectification unit, an LED unit, a constant current controller, a series and parallel voltage divider and a controller. The controller is built in with a safe voltage threshold, controls the series and parallel voltage divider to be connected in series to the LED unit when an output voltage of the rectification unit exceeds the safe voltage threshold, ensuring that an average voltage across the LED unit and the constant current controller is stable, and controls the series and parallel voltage divider to be parallelly connected across the LED unit and the ground when the output voltage of the rectification unit does not exceed the safe voltage threshold. Accordingly, a safety standard of voltage for LED driving circuit can be secured and users' safety can be ensured. | 03-06-2014 |
20140077713 | LUMINAIRE - A luminaire according to one embodiment includes a DC power supply circuit, a switching power supply, and a lighting load. The DC power supply circuit converts an AC voltage controlled in phase to a DC voltage. The switching power supply is connected to the DC power supply circuit, and is controlled so that an input current becomes a constant current. The lighting load is connected as a load circuit of the switching power supply. | 03-20-2014 |
20140077714 | DRIVING DEVICE, LIGHT-EMITTING DEVICE AND PROJECTOR - A driving device includes a switching power supply circuit to convert input power to output power; a first switching element which opens and closes a circuit of a load; an output capacitor connected in parallel to the load and the first switching element; a selection switch disposed between the inductor and the output capacitor, the selection switch switching between a first selection state where the load is electrically connected to the inductor and the second selection state where a reference potential portion is electrically connected to the inductor; a timing controller which operates the switching power supply circuit while the first switching element is closed; and a controller which puts the selection switch into the second selection state before the first switching element is closed. | 03-20-2014 |
20140084798 | PFC LED DRIVER CAPABLE OF REDUCING FLICKER - A PFC LED driver capable of reducing flicker, including: a bridge rectifier, used to generate a full-wave-rectified line input voltage according to an AC power a single stage PFC constant average current converter, coupled with the bridge rectifier and used for forcing an input current to track the full-wave-rectified line input voltage and regulating an average value of an output current at a first preset value; and a peak current regulator, in series with an LED module to form a load for the output current to flow through, wherein the peak current regulator is used to regulate a peak of the output current at a second preset value, and the second preset value is higher than the first preset value. | 03-27-2014 |
20140084799 | LIGHT SOURCE DRIVING DEVICE AND ILLUMINATING APPARATUS USING THE SAME - A light source driving device includes a transformer, a rectifying diode, a filter, and an open loop preventing circuit. The transformer has a primary winding part including first and second external input terminals configured to receive external power from a ballast stabilizer and a coil having an impedance level set to allow the ballast stabilizer to output a normal amount of power, and a secondary winding part electromagnetically coupled to the primary winding part to transform received external power. The rectifying diode rectifies power from the secondary winding part, and the filter filters the rectified power from the rectifying diode. The open loop preventing circuit provides a closed loop to the filter such that power stored in the filter is applied to the output terminal when the rectifying diode is turned off. | 03-27-2014 |
20140084800 | DRIVING LIGHT EMITTING DIODE (LED) LAMPS USING POWER RECEIVED FROM BALLAST STABILIZERS - A circuit drives a light emitting diode (LED) lamp based on alternating current (AC) power received from a ballast stabilizer. The circuit includes an inductive load, a rectifying circuit, and an output circuit. The inductive load is coupled to and receives the AC power from the ballast stabilizer. The rectifying circuit is electrically coupled to the inductive load and rectifies the AC power to produce a unidirectional current. The output circuit receives the unidirectional current from the rectifying circuit, and produces an output current for driving the LED lamp. Various additional circuits and illuminating apparatuses for producing light from AC power using a LED lamp are also provided. | 03-27-2014 |
20140091723 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light source having an adjustable color temperature is provided. The driving circuit includes a power converter, coupled between a power source and the light source and operable for receiving power from the power source and for providing a regulated power to the light source; and a color temperature controller, coupled to the power converter and operable for receiving a switch monitoring signal indicative of an operation of a power switch coupled between the power source and the power converter, and for adjusting the color temperature of the light source based on the switch monitoring signal. | 04-03-2014 |
20140097764 | LIGHTING CIRCUIT AND LAMP - A lighting circuit ( | 04-10-2014 |
20140103826 | TWO-WIRE DIMMER SWITCH FOR LOW-POWER LOADS - A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive. | 04-17-2014 |
20140103827 | TWO-WIRE DIMMER SWITCH FOR LOW-POWER LOADS - A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive. | 04-17-2014 |
20140111104 | LIGHT-EMITTING DEVICE CIRCUIT AND METHOD OF OPERATING THEREOF - The light-emitting device disclosed herein comprises a step down circuit and a current limit device, wherein the step down circuit prevents the current signal provided to the light-emitting device larger than the rating current value of the light-emitting device. Moreover, the current limit device only limits current signal while the power supply surges. The two stages protect circuit turn less power to heat. | 04-24-2014 |
20140111105 | DIMMER CIRCUIT AND LIGHTING APPARATUS USING THE SAME - A dimmer circuit and a lighting apparatus using the same are provided. The dimmer circuit comprises a dimmer, a rectifier, a sample-and-hold unit, an integral unit and a current holding circuit. The dimmer is coupled to an AC for modulating the AC into an alternating signal. The rectifier couples the dimmer and the AC for rectifying the alternating signal into a DC signal. The sample-and-hold unit is coupled to the rectifier for sampling the DC signal to obtain an average positive wave pulse. The integral unit is coupled to the sample-and-hold unit for integrating the average positive wave pulse to generate a DC voltage. The current holding circuit comprises a switch and a bleeder. The current holding circuit determines the on/off state of the switch according to a comparison between the DC voltage and a reference voltage, such that the DC signal passes through the bleeder or the switch. | 04-24-2014 |
20140111106 | BALLAST WITH TEMPERATURE COMPENSATION - A ballast for driving a gas discharge lamp includes an inverter configured to generate a lamp supply voltage signal, and a voltage regulator coupled to the inverter and configured to generate a regulation signal. The regulation signal is used by the inverter to maintain the lamp voltage signal at a substantially constant voltage. A thermistor circuit is coupled between the lamp supply voltage signal and the voltage regulator and configured to detect a temperature of the ballast. The lamp supply voltage signal is varied by the regulation signal in accordance with the detected temperature of the ballast. | 04-24-2014 |
20140111107 | LED DRIVING APPARATUS HAVING HOLDING CURRENT CIRCUIT AND OPERATING METHOD THEREOF - A LED driving apparatus having a holding current circuit and an operating method thereof are disclosed. The holding current circuit includes an input terminal, a holding resistor, a regulator, a first resistor, a second resistor, a setup resistor, a control unit, and a transistor. The holding resistor and the regulator, the first resistor and the second resistor, and the transistor and the setup resistor are coupled between the input terminal and ground terminal respectively. The control unit is coupled to the transistor, between the holding resistor and the regulator, and between the first resistor and the second resistor respectively. The control unit receives a first voltage between the holding resistor and the regulator and a second voltage between the first resistor and the second resistor and outputs a control signal to selectively control the transistor off. | 04-24-2014 |
20140117865 | AC/DC POWER CONVERTER - In one embodiment, an AC/DC power converter can include: a rectifier bridge and a filter capacitor for converting an external AC voltage to a half-sinusoid DC input voltage; a first storage component, where during each switching cycle in a first operation mode, a first path receives the half-sinusoid DC input voltage to store energy in the first storage component, and a first current through the first storage component increases; a second storage component, where a second path receives a second DC voltage to store energy in the second storage component, and a second current through the second storage component increases; and a third storage component, where in a second operation mode, the first current decreases to release energy from the first to the third storage component, where the second DC voltage includes a voltage across the third storage component through a third path. | 05-01-2014 |
20140125239 | CIRCUITS AND METHODS FOR REDUCING FLICKER IN AN LED LIGHT SOURCE - Method and circuits for balancing a first waveform used to drive an LED are disclosed herein. The first waveform has a first cycle with a first amplitude and a second cycle with a second amplitude. An embodiment of the method includes adjusting the first amplitude of the first cycle to match the second amplitude of the second cycle, the result being a second waveform. The LED is driven with the second waveform. | 05-08-2014 |
20140125240 | Dimmable LED Driver And Method For Controlling The Same - A dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED driver comprises: a rectifier configured to convert an alternating current output by the dimmer to a direct current, a buck PFC block configured to adjust an output voltage of the direct current so as to obtain a stable output voltage, a second buck DC/DC block configured to realize output of a constant current after the stable output voltage is realized, a dimming block configured to, after realizing output of the constant current, accomplish a dimming function jointly with the second buck DC/DC block, and an MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block. | 05-08-2014 |
20140125241 | DC-DC DRIVER DEVICE HAVING INPUT AND OUTPUT FILTERS, FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT - The present invention relates to a driver device ( | 05-08-2014 |
20140132167 | FLORESCENT BALLAST TO DC POWER SYSTEM - A lighting element for use in a light fixture optionally utilizing a ballast. The lighting element includes a light emitting diode having a set of input pins on opposing ends of a housing. The input pins are configured to engage the light fixture. The lighting element also includes an electronic unit in communication with the light fixture to receive an alternating current. The electronic unit has a solid state core to convert alternating current to direct current. The electronic unit is configured to regulate power to the light emitting diode. The electronic unit is coupled to the light emitting diode within the housing between the input pins, acting as a singular structure. | 05-15-2014 |
20140132168 | Power Supply Device and Lighting Equipment Provided with Power Supply Device - A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal. | 05-15-2014 |
20140145633 | LIGHT-EMITTING DIODE PACKAGE AND METHOD OF FABRICATING THE SAME - A Light Emitting Diode (LED) package and a method of manufacturing the same. The LED package includes a substrate. The substrate defines therein a cavity having a tapered shape, a stepped portion formed on the upper end of the cavity, and a through hole formed in the bottom of the cavity. A conductive film fills the through-hole and is formed on the bottom and the side surfaces of the cavity. An LED has a fluorescent layer thereon, and is flip-chip bonded onto the conductive film. An encapsulant encapsulates the cavity. A Zener diode or a rectifier is provided on the silicon substrate. | 05-29-2014 |
20140152187 | CIRCUITS AND METHODS FOR DRIVING A LIGHT SOURCE - A circuit includes a bridge circuit, a converter, and a controller. The bridge circuit receives power from first and second power lines of a switch and generates a rectified voltage. The switch is capable of operating in a first state in which the switch conducts power to the first power line but not the second power line, a second state in which the switch conducts power to the second power line but not the first power line, and a third state in which the switch conducts power to both the first and second power lines. The converter converts the rectified voltage to an output voltage to drive a light source, and controls a current through the light source according to a driving signal. The controller monitors the operation state of the switch and generates the driving signal based on the operation state to control brightness/dimming of the light source. | 06-05-2014 |
20140159601 | POWER SUPPLY CIRCUIT AND ILLUMINATION DEVICE - There is provided a power supply circuit including a power converting unit, a control unit, and a power supply unit for control. The power converting unit converts a conduction angle controlled alternating-current voltage supplied via a power supply path so as to be supplied to a load. The control unit detects a conduction angle of the alternating-current voltage and controls conversion of a voltage by the power converting unit according to the detected conduction angle. The power supply unit for control is electrically connected to the power supply path and converts the alternating-current voltage so as to be supplied to the control unit. | 06-12-2014 |
20140159602 | POWER SUPPLY CIRCUIT AND LUMINAIRE - There is provided a power supply circuit including a power converting unit configured to convert a conduction angle controlled alternating-current voltage supplied via a power supply path and supply a direct-current voltage to a load, a control unit configured to detect a conduction angle of the alternating-current voltage and control the conversion of the voltage according to the detected conduction angle, and a power supply unit including a first branch path electrically connected to the power supply path, a semiconductor element configured to adjust an electric current flowing to the first branch path, a thermosensor configured to limit, if the temperature of the semiconductor element is equal to or higher than an upper limit temperature, an electric current flowing to the semiconductor element. The power supply unit converts the alternating-current voltage input via the first branch path and supplies a direct-current voltage to the control unit. | 06-12-2014 |
20140159603 | LED DRIVING APPARATUS AND METHOD - There are provided an LED driving apparatus and an LED driving method. The LED driving apparatus includes a rectifying unit rectifying AC power; a light emitting unit including a plurality of light emitting diodes; a switching unit including a plurality of switching elements connected to the plurality of light emitting diodes; and a controlling unit controlling operations of the plurality of light emitting diodes, wherein the controlling unit controls a duty ratio of a turned-on switching element based on a level of the AC power within respective turning-on periods of the plurality of switching elements. | 06-12-2014 |
20140159604 | Power Supply Circuit and Luminaire - A power supply circuit includes a power converting unit, a current adjusting unit, and a control unit. The power converting unit is configured to convert an alternating-current voltage into a direct-current voltage and supply the direct-current voltage to a load. The alternating-current voltage is subjected to conduction angle control and is supplied via a power supply path. The current adjusting unit includes a branch path electrically connected to the power supply path and can switch a first path state and a second path state. The first path state feeds a part of an electric current flowing through the power supply path to the branch path. The control unit detects a conduction angle of the alternating-current voltage, controls the conversion of the direct-current voltage by the power converting unit according to the detected conduction angle, and controls the current adjusting unit according to the detected conduction angle. | 06-12-2014 |
20140159605 | AC-DC POWER CONVERTER - In one embodiment, an AC-DC power converter can include: (i) a rectifier bridge and filter to convert an external AC voltage to a DC input voltage; (ii) a first energy storage element to store energy from the DC input voltage via a first current through a first conductive path when in a first operation mode; (iii) a second energy storage element configured to store energy from a second DC voltage via a second current through a second conductive path when in the first operation mode; (iv) a transistor configured to share the first and second conductive paths; (v) the first energy storage element releasing energy to a third energy storage element and a load through a third conductive path when in a second operation mode; and (vi) the second energy storage element releasing energy to the load through a fourth conductive path during the second operation mode. | 06-12-2014 |
20140159606 | Energy-Recycling Burn-In Apparatus and Method of Burn-In for Electronic Ballasts - An apparatus and method for burning-in an electronic ballast for a lamp. The apparatus comprises a first stage for emulating an input impedance characteristic of a lamp for the electronic ballast and a second stage connected to the first stage for providing energy feedback to a power supply. An input of the first stage connects in use to the electronic ballast to be burnt-in. An output of the second stage connects in use to the power supply to provide energy feedback to said power supply from the electronic ballast being burnt-in. The energy-recyclable burn-in apparatus can emulate the lamp characteristics from start up to the steady state, process high-frequency ballast output power and recycle the power back into the power grid. The burn-in method includes operating the apparatus for a predetermined period of time such that a voltage applied to the electronic ballast simulates a steady-state operation of a lamp for the electronic ballast. | 06-12-2014 |
20140175997 | ADAPTIVE LIGHT EMITTING DIODE DIMMING DRIVING CIRCUIT - An adaptive LED dimming driving circuit is disclosed, wherein its control module is disposed with a first resistor, a second resistor, a retainer, a third resistor and a fourth resistor. When the control module receives an input voltage, the retainer is driven to output a retaining current I | 06-26-2014 |
20140191679 | DIMMING CIRCUIT AND LIGHTING DEVICE USING THE SAME - A dimming circuit and a lighting device using the same are provided. The dimming circuit comprises an interface trigger unit, an average duty cycle calculating unit, a control voltage calculating unit and a comparing unit. The interface trigger unit receives an on-time of each pulse width from each period in a PWM signal. The average duty cycle calculating unit is coupled to the interface trigger unit and calculates a ratio of the on-time to the period. The control voltage calculating unit is coupled to the average duty cycle calculating unit, and calculates a desired voltage according to the ratio. The comparing unit is coupled to the control voltage calculating unit, and sends the desired voltage and a differential voltage to a driving circuit. | 07-10-2014 |
20140197753 | Switching Power Source and Lighting Device - A switching power source includes first and second inductors, a switching element, current control element, rectifier element, and control circuit. The switching element supplies a power source voltage to the first inductor. The current control element detects a current flowing in the switching element and has first and second main terminals, and a control terminal, with the second main terminal connected to the switching element. The control circuit turns off the current control element and interrupts the current flowing in the switching element when a voltage between the second main terminal and the first main terminal of the current control element is equal to or higher than a specified value. The rectifier circuit is series-connected to one of the switching element and the current control element. The second inductor is magnetically coupled to the first inductor, in which a potential turning on and off the switching element can be induced. | 07-17-2014 |
20140232279 | SUPPLEMENTAL LOAD CIRCUIT FOR LOW POWER TRAFFIC LAMPS - The present disclosure provides a supplemental load circuit configured to provide a supplemental power consumption to enable a lamp unit operating at a low power consumption to operate with a traffic controller configured to test for a higher power consumption. The supplemental load circuit includes a load, power input circuitry configured to receive a DC power signal from the lamp unit, and a control switch configured to receive a control signal having a duty cycle from the lamp unit. The control switch is configured to control application of the DC power signal to the load by the power input circuitry based on the duty cycle of the control signal. The present disclosure also provides a method for enabling a lamp unit to operate with a traffic controller designed for higher power lamp units. | 08-21-2014 |
20140232280 | Rectifying Circuit and Power Supply Circuit - According to one embodiment, a rectifying circuit includes a diode, a switching element, a capacitor and an auxiliary winding. The diode is connected between a first terminal and a second terminal while a direction directed from the second terminal to the first terminal is a forward direction. The switching element includes a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the diode, and a gate electrode connected to an anode of the diode. The auxiliary winding is magnetically coupled to an inductor. The auxiliary winding is connected to the gate electrode through the capacitor, and is connected to the second main electrode of the switching element and the cathode of the diode. | 08-21-2014 |
20140232281 | Rectifier Circuit and Power Source Circuit - According to an embodiment, a rectifier circuit includes a first diode, a switching element, and a second diode. The first diode is connected between a first terminal and a second terminal so that a direction toward the first terminal from the second terminal is in a forward direction. The switching element has a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the first diode, and a gate electrode connected to an anode of the first diode. The second diode is connected in parallel with respect to the switching element so that a direction toward the first terminal from the cathode of the first diode is in a forward direction, between the first main electrode and the second main electrode of the switching element. | 08-21-2014 |
20140232282 | RESONANT CONVERTER - Consistent with an example embodiment, a resonant converter comprises a signalling transformer that is used to transfer information between the secondary winding and primary winding of the converter whilst maintaining mains isolation between the two sides. In the embodiment, according to the disclosure, the use of a signalling transformer (in addition to a switching, or resonant, transformer) eliminates the need for an opto-coupler to transfer information and so allows for the construction of a simpler, more reliable and/or cheaper resonant converter. Other embodiments described herein may be suitable for use in dimmable LED driver applications, for example. | 08-21-2014 |
20140239829 | LED DRIVER - The present application discloses a LED driver including: a first and a second auxiliary windings connected in series with each other; a first rectifying device coupled with a terminal of the first auxiliary winding while the other terminal is coupled with the second auxiliary winding; a second rectifying device coupled with a terminal of the second auxiliary winding; a first voltage regulator coupled with the first rectifying device; an unidirectional conducting device having a positive and a negative terminals; and a DC output terminal coupled with the negative terminal of the unidirectional conducting device and configured to provide required DC electricity to a control circuit in the LED driver. The LED driver can guarantee that Vcc voltages provided under a heavy or light load state can always meet the DC power supplying requirements of respective control devices in the driver and meanwhile losses can be reduced. | 08-28-2014 |
20140239830 | LED CURRENT CONTROL APPARATUS - According to an embodiment, an LED current control apparatus controls conduction of a switching transistor which is connected to a primary winding of a flyback convertor. The LED current control apparatus includes a pseudo sine wave generation unit, a synchronous control unit, a first comparator, a switch control unit, a crest value correction unit, and a pulse monitor control unit. | 08-28-2014 |
20140239831 | SEMICONDUCTOR DEVICE AND POWER SUPPLY DEVICE - A power supply topology is used in which a transistor is provided on the side of an output node of a rectifying circuit. An inductor is provided on the side of a reference node, a resistor is inserted between the transistor and the inductor, and one end of the resistor is coupled to a ground power supply voltage of a PFC circuit. The PFC circuit includes a square circuit which squares a result of multiplication of an input voltage detection signal and feedback information (output voltage of an error amplifier circuit). The PFC circuit drives on the transistor when a detection voltage developed at the resistor reaches zero, and drives off the transistor when the detection signal reaches an output signal of the square circuit. | 08-28-2014 |
20140246985 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver, and driving methods thereof. In one embodiment, a high efficiency LED driving method can include: (i) receiving an AC input voltage to obtain an absolute value thereof; (ii) receiving a DC bus voltage, and driving the LED device through a power switch; (iii) generating a first reference voltage according to a driving current and an expected driving current; (iv) comparing the absolute value against a sum of a driving voltage and the first reference voltage; (v) when the absolute value is greater than the sum of the driving voltage and the first reference voltage, turning off the power switch; and (vi) when the absolute value is greater than the driving voltage but less than the sum of the driving voltage and the first reference voltage, turning on the power switch to generate an output current. | 09-04-2014 |
20140252969 | PFC LED DRIVER HAVING A FLICKER CONTROL MECHANISM - A PFC LED driver having a flicker control mechanism, including: a bridge rectifier, used to generate a full-wave-rectified line input voltage according to an AC power; a single stage PFC constant average current converter, coupled with the bridge rectifier and used for forcing an input current to track the full-wave-rectified line input voltage and regulating an average value of an output current at a first preset value; and a current ripple reducing unit, in series with an LED module to form a load for the output current to flow through, wherein the current ripple reducing unit has a negative feedback control mechanism for forcing a peak of the output current approach an average value of the output current. | 09-11-2014 |
20140252970 | DYNAMIC STEP DIMMING INTERFACE - A dynamic step dimming interface is provided that allows a ballast to energize a lamp in a dim mode or a normal mode. The ballast includes a lamp controller that energizes the lamp using an oscillating current. The oscillating current is also provided to a voltage monitor, which indicates the voltage level of the oscillating current, and to a rectifier, which provides an output indicative of the oscillating current. The rectifier is responsive to user input indicating whether the dim mode or the normal mode is to be used. A processing circuit receives the voltage level from the voltage monitor and provides a mode command to the ballast, indicating the lamp mode, based on inputs received, and provides a reference voltage to a comparator. The comparator receives the rectifier output and the reference voltage, and generates a voltage indicative of a power level of the lamp for the processing circuit. | 09-11-2014 |
20140252971 | Method of Manufacturing a Semiconductor Device - The present invention supplies a manufacturing method of a semiconductor device, which includes a non-contact inspection process capable of confirming if a circuit or circuit element formed on an array substrate is normally performed and can decrease a manufacturing cost by eliminating wastes to keep a defective product forming. | 09-11-2014 |
20140252972 | LED LIGHT SOURCE WITH REDUCED FLICKER - An illumination control system includes a rectifying device, a damping device for inhibiting flickering, and a load circuit, wherein the illumination control system further comprises a recognizing control circuit connected between the rectifying device and the damping device, and wherein the recognizing control circuit includes a recognizing signal output module and a switch module, the recognizing signal output module generates a first control signal indicating that a dimmer is not connected upstream the rectifying device or the dimmer is connected upstream the rectifying device and reaches a predetermined dimming level and a second control signal indicating that the dimmer is connected upstream the rectifying device and does not reach the predetermined dimming level and at least one damping resistor of the damping device is short connected or is connected by means of the switch module according to the first control signal or the second control signal. | 09-11-2014 |
20140252973 | Ripple Cancellation Converter with High Power Factor - Provided are circuits and methods for use with a power supply that provides a main output including a main DC voltage having a first AC voltage ripple, or a main DC current having a first AC current ripple. A ripple cancellation converter provides a second AC voltage ripple connected in series with the main output, such that the first AC voltage ripple is substantially cancelled; or a second AC current ripple connected in parallel with the main output, such that the first AC current ripple is substantially cancelled. As a result, substantially ripple-free DC output power is provided. | 09-11-2014 |
20140265895 | Damping Resonance In A Converter Including A Coupling Capacitor - A converter circuit includes an input filter including an input capacitor configured to filter electromagnetic interference from an input voltage. The converter circuit includes an output capacitor, a first inductor coupled to the input capacitor, a switch coupled to the first inductor and configured to control a level of current flowing in the first inductor, a coupling capacitor connected to the first inductor, and an output rectifier coupled between the coupling capacitor and the output capacitor. A damping circuit that is configured to damp a resonant frequency of the converter circuit is coupled in parallel with the coupling capacitor. | 09-18-2014 |
20140265896 | LIGHT DRIVER CONTROL SYSTEM - A system for controlling a light source includes a control circuit to be coupled to an ac source to receive an ac signal. The control circuit includes an input controller coupled to receive an input control signal and dimming command circuitry coupled to the input controller and coupled to receive the ac signal. The dimming command circuitry is coupled to remove one or more portions of a predetermined duration from the ac signal followed by a substantially full ac signal in response to the input control signal. A lighting driver circuit is to be coupled to a light source and coupled to receive the ac signal from the control circuit. The lighting driver circuit is coupled to drive the light source to have a light output adjusted in response to the removed one or more portions of the predetermined duration from the ac signal by the dimming command circuitry. | 09-18-2014 |
20140265897 | CHARGING AN INPUT CAPACITOR OF A LOAD CONTROL DEVICE - A load control device for controlling the amount of power delivered to an electrical load may include a rectifier circuit configured to receive a phase-control voltage and produce a rectified voltage. A power converter may be configured to receive the rectified voltage at an input and generate a bus voltage. An input capacitor may be coupled across the input of the power converter. The input capacitor may be adapted to charge when the magnitude of the phase control voltage is approximately zero volts. The power converter may be configured to operate in a boost mode, such that the magnitude of the bus voltage is greater than a peak magnitude of the input voltage. The power converter may be configured to operate in a buck mode to charge the input capacitor from the bus voltage when the magnitude of the phase-control voltage is approximately zero volts. | 09-18-2014 |
20140265898 | LOSSLESS PRELOAD FOR LED DRIVER WITH EXTENDED DIMMING - A quasi-phase active preload circuit to be coupled at the output of a non-isolated LED driver converter having a pre-stage phase-angle control dimmer circuit, such as a commonly used leading-edge control Triac dimmer, is disclosed. The quasi-phase active preload circuit may include a preload resistor coupled to a current-controlled current source configured to draw a sinking current through the preload resistor based on a peak detect signal. The peak detect signal may be, in one example, representative of a leading-edge peak voltage of an output of the Triac dimmer circuit, which may be representative of a conduction angle of the Triac dimmer circuit. During normal operating conditions, no sinking current is drawn through the preload resistor. During low dimming conditions, a sinking current that is responsive to the peak detect signal is drawn through the preload resistor. During deep dimming or when used with a leaky Triac dimmer, a maximum sinking current may be drawn through the preload resistor by the current-controlled current source. | 09-18-2014 |
20140265899 | Linear LED Driver - A linear driver circuit includes an AC input, a rectifier connected to the AC input, a linear power supply connected to the rectifier, a load output connected to the linear power supply, a current detector connected to the load output, and a controller connected to the current detector and to the linear power supply. | 09-18-2014 |
20140265900 | Fluorescent Lamp LED Replacement - An apparatus for supplying power includes a power input configured to receive electrical current from a fluorescent lamp fixture ballast, a rectifier connected to the power input, a constant current driver connected to an output of the rectifier, and a power output. | 09-18-2014 |
20140265901 | DRIVER FOR CONNECTING LED TO ELECTRONIC BALLAST - To allow an electronic ballast ( | 09-18-2014 |
20140285099 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, there is provided a power supply circuit including a power conversion unit, a current regulator, a controller, and a controller power supply. The power conversion unit converts an AC voltage with a controlled conduction angle into a different voltage. The current regulator includes a branch path electrically connected to the power supply path and switches between a first state in which a part of a current flowing through the power supply path flows to the branch path and a second state in which a current flowing to the branch path is lower than that of the first state. The controller switches the current regulator to the second state in at least a part of a conduction period of a detected conduction angle and switches the current regulator to the first state in a blocking period of the detected conduction angle. | 09-25-2014 |
20140285100 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, provided is a power supply circuit including a power conversion unit, a controller, and an integrated circuit. The power conversion unit converts an AC voltage into a different voltage. The integrated circuit includes a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to an input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state, a controller power supply that converts a voltage into a driving voltage and supplies the driving voltage to the controller, a connection terminal for connecting an auxiliary power supply used for generating the driving voltage, and a protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal. | 09-25-2014 |
20140285101 | Lighting Power Source and Lighting Device - According to one embodiment, a lighting light source including a current control element and a voltage-dividing resistor is provided. The current control element has a first main electrode, a second main electrode series-connected with respect to a lighting light source, and a first control electrode for controlling a current flowing between the first main electrode and the second main electrode, and controls a current supplied to the lighting light source. The voltage-dividing resistor is parallel-connected with respect to the lighting light source and connected to the first control electrode, and inputs a voltage obtained by division of a voltage of the lighting light source to the first control electrode. | 09-25-2014 |
20140300288 | LIGHT EMITTING DEVICE POWER SUPPLY CIRCUIT AND DAMPING CIRCUIT THEREIN AND DRIVING METHOD THEREOF - The present invention discloses a light emitting device power supply circuit and a damping circuit therein and a driving method thereof. The light emitting device power supply circuit includes: a tri-electrode AC switch (TRIAC) dimming circuit, a rectifier circuit, a light emitting device driver circuit, and a damping circuit. The damping circuit includes: an impedance circuit, which is electrically connected between the rectifier circuit and the light emitting device driver circuit; a silicon control rectifier (SCR) circuit, which is connected to the impedance circuit in parallel; and a delay circuit, which is coupled to the SCR circuit, for turning ON the SCR circuit after a delay time period from when the TRIAC diming circuit begins to start-up, wherein the delay circuit does not directly receive a full scale of the input voltage. | 10-09-2014 |
20140312794 | THREE-WAY OMNI-DIRECTIONAL LED LAMP DRIVER CIRCUIT - An LED driver circuit has a rectifier circuit including a first input terminal coupled to a first AC voltage line and a second input terminal coupled to a second AC voltage line. The rectifier circuit is configured to convert a first AC voltage on the first AC voltage line and a second AC voltage on the second AC voltage line to a DC voltage. The driver circuit has a switching circuit coupled to the first AC voltage line and to the second AC voltage line and configured to generate a reference AC voltage based on the first AC voltage and the second AC voltage. The driver circuit has a power management circuit configured to provide a current or power to an LED lamp based on the generated AC reference voltage. The driver circuit has a power supply circuit configured to provide a constant current or power to the power management circuit. | 10-23-2014 |
20140312795 | Driver device and driving method for driving a load, in particular an led unit - The present invention relates to a driver device ( | 10-23-2014 |
20140320033 | DIMMABLE SCREW-IN COMPACT FLUORESCENT LAMP HAVING INTEGRAL ELECTRONIC BALLAST CIRCUIT - A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit generates a lamp current through the lamp tube having a substantially constant envelope such that flicker in the lamp tube and electromagnetic interference (EMI) noise on an AC voltage supply are minimized. The dimmable ballast circuit comprises a high speed control circuit characterized by a cutoff frequency much greater than a frequency of a voltage ripple on a bus voltage of the ballast circuit. The dimmable ballast circuit may also comprise a non-linear amplifier circuit amplifying a lamp-current-feedback signal representative of the magnitude of the lamp current through the lamp. | 10-30-2014 |
20140327366 | ILLUMINATION DEVICE AND LED DIMMING CIRCUIT THEREOF - An illumination device includes a light-emitting diode (LED) lamp and a LED dimming circuit. The LED dimming circuit includes a power converting module, a sensing unit and a dimming module. The power converting module is used to generate a driving voltage to drive the LED lamp. The sensing unit is used to generate a sensing voltage signal. The dimming module includes an input interface, a dimming signal generator and an isolating unit. The input interface is used to receive a dimming control signal. The dimming signal generator is used to output a first feedback signal based on the sensing voltage signal and the dimming control signal. The isolating unit is used to receive the first feedback signal and output a second feedback signal to the power converting module so as to control a driving current. | 11-06-2014 |
20140327367 | CONTROL CIRCUIT OF LIGHT EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit which full-wave rectifies an alternating current power supply, a clock generator which generates and outputs a clock signal (CLK), a first comparator which compares a comparison voltage (CS) corresponding to a current flowing to the light-emitting element and a reference voltage (REF), and a switching element which is set to an ON state in synchronization with the clock signal (CLK) and which is set to an OFF state when the comparison voltage (CS) becomes greater than the reference voltage (REF) at the first comparator, to switch the current flowing to the light-emitting element. In this structure, a period of the clock signal (CLK) generated in the clock generator is varied, to reduce or inhibit noise. | 11-06-2014 |
20140333221 | LED LIGHT UNIT AND METHOD OF OPERATING AN LED LIGHT UNIT - An LED light unit, in particular for a passenger transport vehicle, such as an aircraft, a road vehicle, a ship or a rail car, is disclosed that has at least one LED and is configured to be used with a high intensity discharge lamp power supply that is adapted to monitor its output behavior. The LED light unit comprises a power input coupleable to the high intensity discharge lamp power supply, a capacitor switchably coupled to the power input for absorbing electrical energy from the high intensity discharge lamp power supply, and a power dissipating element switchably coupled to the power input for dissipating electrical energy from the high intensity discharge lamp power supply. | 11-13-2014 |
20140339995 | SINGLE PIN CONTROL OF BIPOLAR JUNCTION TRANSISTOR (BJT)-BASED POWER STAGE - A power stage for light emitting diode (LED)-based light bulbs may include a bipolar junction transistor (BJT). The base of BJT switch may be biased externally and the operation of the BJT may be through a single pin to the emitter of the BJT. A controller integrated circuit (IC) may control the power stage through the main BJT's emitter pin in an emitter-controlled BJT-based power stage. The emitter-controlled BJT-based power stage may replace the conventional buck-boost power stage topology. For example, the controller may activate and deactivate a switch coupling the BJT's emitter to ground. A power supply for the controller IC may be charged from a reverse recovery of charge from the BJT, and the reverse recovery controlled by the controller IC. | 11-20-2014 |
20140346963 | LIGHT SOURCE DRIVING APPARATUS AND LIGHT SOURCE SYSTEM - A light source driving apparatus includes a triac configured to control a phase of an output voltage, a diac connected to a gate of the triac and configured to apply a trigger signal, a voltage charger configured to provide a breakover voltage to the diac, a variable resistor unit configured to determine a point in time at which the voltage charger provides a breakover voltage, and a variable impedance unit connected to both ends of the triac. The variable impedance unit includes a capacitor and an inductor, and is configured to vary impedance of the variable impedance unit. | 11-27-2014 |
20140346964 | APPLICATION CIRCUIT AND CONTROL METHOD THEREOF - An application circuit includes a dynamic load circuit and a control circuit. The dynamic load circuit is electrically connected to a light source. The control circuit is electrically connected to the dynamic load circuit and a TRIAC. The control circuit controls the load status of the dynamic load circuit based on output current from the TRIAC, so as to turn on the light source. | 11-27-2014 |
20140346965 | OPERATING DEVICE WITH POWER FACTOR CORRECTION AND RIPPLE LIMITATION BY CHANGE IN OPERATION - Operating device (A) for a luminous means, the operating device having at least one driver circuit for operating at least one luminous means (Last), an energy store (Cbulk) which supplies the driver circuit, a power factor correction circuit which is in the form of a boost converter, supplies the energy store (Cbulk) and has a storage inductor (Lb), an actively clocked switch (S) and a rectifier diode (D), wherein the storage inductor (Lb) has a secondary winding which is arranged in such a manner that said winding is magnetically coupled to the primary winding of the storage inductor (Lb) and is connected in series with a coupling capacitor. | 11-27-2014 |
20140354165 | LED LIGHT SOURCE - Dimmable LED light source comprising: —a rectifier having rectifier input terminals for connection to respective output terminals of a phase cut dimmer of the trailing edge type, input terminals of the phase cut dimmer being connected to the mains supply, and having a first rectifier output terminal and a second rectifier output terminal, —a bleeder circuit connecting the rectifier output terminals, —a series arrangement comprising a first unidirectional element and first capacitive means connecting the rectifier output terminals, —a converter circuit, having input terminals coupled to respective sides of the first capacitive means and output terminals coupled to a LED load, for generating a current through the LED load, in dependence on a dim signal, out of a voltage present across the capacitive means, —a dim circuit for generating a dim signal as a function of the adjusted phase angle of the phase cut dimmer and for supplying the dim signal to a dim input of the converter circuit, —a series arrangement comprising a switching element and second capacitive means coupled between a terminal between the first unidirectional element and the second output terminal of the rectifier, —a control circuit for controlling the switching element in the conductive state when the voltage between the first and second output terminals of the rectifier drops below a first predetermined reference and for controlling the switching element in the non-conductive state when the voltage across the second capacitive means has reached a second predetermined reference, wherein the first capacitive means is dimensioned so that the voltage between the first and the second output terminal of the rectifier equals the sum of the voltage across the first capacitive means and the voltage across the first unidirectional means if the switching element is non-conductive. | 12-04-2014 |
20140361699 | LED CONTROL CIRCUITS AND METHODS - An LED controller is disclosed herein. An embodiment of the controller includes a first input connectable to a power source and an output connectable to at least one light-emitting diode (LED). A power factor correction circuit is coupled between the first input and the output, wherein the power factor correction circuit operates in a first state when the power factor is corrected and wherein the power factor correction circuit operates in a second state when the power factor is not corrected. The power factor correction circuit is in the first state when no dimming of the LED is sensed, and the power factor correction circuit is in the second state when dimming of the LED is sensed. | 12-11-2014 |
20140361700 | POWER SUPPLY FOR A FIELD EMISSION LIGHT SOURCE - The present invention relates to a power supply for a field emission light source. The novel power supply allows for a reduction in size as well as allowing for improvements relating to power factor and efficiency. The size reduction further allows the power supply to efficiently be integrated together with the field emission light source forming a lighting device. | 12-11-2014 |
20140361701 | SECONDARY SIDE PHASE-CUT DIMMING ANGLE DETECTION - Phase angle detection techniques for phase-cut dimming lighting circuitry are disclosed. A phase-cut lighting driver circuit may include galvanic isolation circuitry having a primary and secondary side. The phase angle information of a phase-cut signal may be detected on the secondary side of the driver circuitry, and a microcontroller can create a dimming signal that adjusts the driver output power according to the phase angle information. In some embodiments, the phase angle detection techniques may be utilized to control the output of lighting driver circuitry, such as a phase-cut dimming LED driver. | 12-11-2014 |
20140361702 | HIGH EFFICIENCY LED DRIVER AND DRIVING METHOD THEREOF - The present invention relates to a high efficiency LED driver and driving method thereof. In one embodiment, a high efficiency LED driving method configured for a LED device can include: (i) receiving a DC bus voltage and generating a driving voltage for the LED device through a power switch; (ii) comparing the DC bus voltage against a sum of the driving voltage and a first reference voltage; (iii) where when the DC bus voltage is greater than the sum of the driving voltage and the first reference voltage, generating a first output current; (iv) where when the DC bus voltage is greater than the driving voltage and less than the sum of the driving voltage and the first reference voltage, generating a second output current; and (v) matching an average current of the first output current and the second output current with a corresponding driving current. | 12-11-2014 |
20140368119 | LIGHT EMITTING DIODE LIGHTING APPARATUS AND DRIVING METHOD THEREOF - There is provide a light emitting diode lighting apparatus capable of being generally used in various kinds of dimmer, the apparatus including: a dimmer varying waveforms of input power according to a dimming signal; a bleeder adjusting a bleeding current under control; a controller comparing a latching current of the dimmer with the bleeding current of the bleeder to control the amount of the bleeding current; and an LED driver receiving a current other than the bleeding current flowing through the bleeder from among the currents from the dimmer to driver a light emitting diode (LED). | 12-18-2014 |
20140375225 | VCC Charge and Free-Wheeling Detection Via Source Controlled MOS Transistor - A driver circuit using a power converter allows free-wheeling detection and/or provision of supply voltage. A circuit controls a switching state of a power switch. A first port of the switch is coupled to an inductor. The circuit is coupled to a control port of the switch wherein the control port of the switch is different from the first port of the switch. The circuit comprises a unit generating a signal for controlling the switching state of the switch wherein the signal is provided to the control port of the switch. Furthermore, the circuit comprises free-wheeling sensing means to detect an oscillation of a voltage at a measurement port of the switch wherein the measurement port of the switch is different from the first port of the switch and wherein the oscillation of the voltage at the measurement port indicates free-wheeling of the inductor. | 12-25-2014 |
20150015150 | LIGHT EMITTING DIODE (LED) LAMP REPLACEMENT DRIVER FOR LINEAR FLUORESCENT LAMPS - Provided is a driver circuit including an input port configured for coupling to a ballast and a transformer having a first side coupled to the input port. The driver circuit also includes a rectifier having an input portion coupled to a second side of the transformer and an output portion configured for coupling to a light source. The transformer is configured to match output characteristics of the ballast to input characteristics of the light source. | 01-15-2015 |
20150015151 | Lighting Circuit and Luminaire - A lighting circuit include a connecting section connected to a light source module to thereby form at least a first path and a second path, a power supplying section connected to the connecting section and capable of supplying first direct-current power and second direct-current power to the light source module, a detecting section configured to detect the connection of the light source module, and a control section configured to determine, when the detecting section detects the connection of the light source module, whether the light source module is connected to the first path or the second path and, when determining that the light source module is connected to the first path, cause the power supplying section to supply the first direct-current power and, when determining that the light source module is connected to the second path, cause the power supplying section to supply the second direct-current power. | 01-15-2015 |
20150015152 | LIGHTING DRIVER AND HOUSING HAVING INTERNAL ELECTROMAGNETIC SHIELDING LAYER CONFIGURED FOR DIRECT CONNECTION TO CIRCUIT GROUND - An apparatus ( | 01-15-2015 |
20150015153 | CIRCUIT AND METHOD FOR DRIVING LED LAMP WITH A DIMMER - A driver circuit for an LED (light-emitting diode) lamp includes a transformer having a primary winding and a secondary winding, a dimmer circuit coupled to a power source for varying an input voltage to the primary winding, and an output rectifying circuit coupled to the secondary winding for providing an output current to the LED lamp. The driver circuit also includes a controller coupled to the dimmer circuit to receive an average input voltage signal (DIM) from the dimmer circuit. The controller is configured to vary the output current according to the average input voltage. | 01-15-2015 |
20150022105 | Method and Apparatus for Extending the Power Output Range of a Power Converter Used for a Lighting System - A method and system for extending the power output range of a power converter used for a lighting system is disclosed. | 01-22-2015 |
20150022106 | LIGHT-EMITTING DIODE DRIVING APPARATUS AND LIGHT-EMITTING DIODE ILLUMINATION SYSTEM USING THE SAME - A LED driving apparatus and a LED illumination system using the same are provided. The LED driving apparatus adapted to drive a LED load having at least one power specification includes a driving circuit, an output detecting circuit and an output adjusting circuit. The driving circuit provides an adjustable output current for driving the LED load. The output detecting circuit is coupled to the driving circuit and the LED load for detecting a driving voltage of the LED load to generate a first detecting signal. The driving circuit drives the LED load under a constant current in response to the first detecting signal. The output adjusting circuit is coupled to the output detecting circuit. The output adjusting circuit is controlled to adjust a signal level of the first detecting signal, such that the adjustable output current has at least one current adjusting range. | 01-22-2015 |
20150022107 | Driver device and driving method for driving a load, in particular a LED unit - The present invention relates to a driver device ( | 01-22-2015 |
20150022108 | LED LIGHT SOURCE - The invention relates to a dimmable LED light source comprising:—a rectifier having rectifier input terminals for connection to respective output terminals of a phase cut dimmer of the trailing edge type, input terminals of the phase cut dimmer being connected to the mains supply, and having rectifier output terminals,—a first bleeder circuit connecting the rectifier output terminals,—a series arrangement comprising a unidirectional element and a capacitive means connecting the rectifier output terminals,—a converter circuit, having input terminals coupled to respective sides of the capacitive means and output terminals coupled to a LED load, for generating a current through the LED load, in dependence on a dim signal, out of a voltage present across the capacitive means,—a dim circuit for generating a dim signal as a function of the adjusted phase angle of the phase cut dimmer and for supplying the dim signal to a dim input of the converter circuit, the dim circuit comprising:—gradient detection circuitry for determining the gradient of the voltage across the capacitive means and for determining as the adjusted phase angle the first value of the phase angle for which the gradient is negative, when the phase angle is less than 90 degrees,—signal generating circuitry for generating a sinusoidal signal that represents the mains supply voltage,—circuitry for activating the first bleeder when the phase angle is 90 degrees and for switching off the first bleeder when the adjusted phase angle has been determined, in case the adjusted phase angle is higher than 90 degrees,—deviation detection circuitry for detecting the deviation of the voltage across the rectifier output terminals from the sinusoidal signal, for comparing the deviation voltage with a reference voltage and for determining as the adjusted phase angle the value of the phase angle for which the deviation voltage is higher than or equal to the reference voltage, when the phase angle is between 90 and 180 degrees. | 01-22-2015 |
20150022109 | DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES - A driving circuit includes a power converter, a dimming controller and a current path coupled to the dimming controller. The power converter receives input power from a rectifier and provides output power to a light source. A power switch transfers power from an AC power source to the rectifier when the power switch is on. The dimming controller receives a switch monitoring signal indicative of the state of the power switch. An average current flowing through the light source has a first value if the power switch is on. The dimming controller is operable for adjusting the average current based on the switch monitoring signal. A current flows from the AC power source through the current path to ground when the power switch is off. | 01-22-2015 |
20150028757 | SINGLE WIRE LIGHTING DRIVER CONTROL - In embodiments of the present invention, there is provided a lighting control device connected in series with an AC supply line of a lighting driver at a control access point, wherein the lighting control device comprises an AC/DC converter configured to receive an input AC voltage from the AC supply line and to convert it to an output DC voltage. The lighting control device further comprises a lighting control circuit configured to use the output DC voltage as a power supply and to transmit control information to the driving unit. | 01-29-2015 |
20150028758 | ISOLATING MINIMAL SWITCHED POWER SUPPLY - Conventional linear or switched power supplies do not sufficiently meet increased requirements for the lowest possible standby losses in idle current mode or ready mode, or for maintaining the charge in storage capacitors or rechargeable batteries even when said supplies have significantly increased circuit complexity. The proposed schematic diagram provides a solution which, in comparison to prior art, can produce a large-scale reduction in said standby losses using a breakover voltage diode, such as e.g. DIAC, SIDAC, TRISIL, or a glow lamp, which, once the respective breakover voltage or triggering voltage has been reached, repeatedly discharges a high-voltage charging capacitor via the primary winding of a pulse transformer, said capacitor in limiting the alternating current with zero-loss and being continuously re-charged by means of a high-voltage input charging capacitor in the surge and ebb supply voltage phases. The pulse bursts of the pulse transformer are rectified on the secondary side and smoothed by means of a buffer capacitor. As the output voltage is clearly dependent on a variable load impedance, a linear fixed voltage regulator with minimal power losses can be connected downstream to stabilise the voltage, without appreciably affecting the energy balance. Sensors that have been decentrally installed can thus be supplied, or a minimal voltage supply for load monitoring and prompt readiness can thus be provided, even for larger switched power supplies and load parts. | 01-29-2015 |
20150035445 | LUMINESCENT SYSTEM AND ORGANIC EL DEVICE - The present invention aims to provide a luminescent system enabling contactless power supply, having a high ratio of light emission region, and securing a desired quantity of emitted light. The luminescent system is constituted by an organic EL device and a fixed-side wall surface. The device is formed by stacking an electrode layer of an anode side, an organic light-emitting layer, and a transparent electrode layer of a cathode side on a substrate and being sealed by a sealing part. Electrodes with a planar expanse are stacked on a face near the wall surface and are arranged so as to overlap a light emitting region where the organic light-emitting layer is disposed. Electrodes with a planar expanse are embedded in the wall surface. A power unit is electrically connected between the electrodes. The electrodes of the device and of the wall surface are opposite each other across a flooring material. | 02-05-2015 |
20150042235 | Power Supply Device and Illumination Device - According to one embodiment, a power supply device includes a substrate, a first inductor, and a second inductor. The substrate has a first surface and a second surface on opposite side from the first surface. The first inductor includes a first coil having a coil center axis substantially parallel to a first direction, is used for a switching circuit for controlling power supplied to a load, and is mounted on the first surface of the substrate. The second inductor includes a second coil having a coil center axis substantially parallel to the first direction, is electrically connected to the first inductor, and is mounted on the second surface of the substrate. As viewed in a direction orthogonal to the first surface, position of the first coil of the first inductor does not overlap position of the second coil of the second inductor. | 02-12-2015 |
20150048750 | LIGHT EMITTING SYSTEM AND VOLTAGE CONVERSION DEVICE THEREOF - A light emitting system includes a series connection of a light emitting unit and a variable current source, and a voltage conversion device that includes a rectifier circuit and an output circuit. The rectifier circuit rectifies an AC voltage to generate a rectified voltage across a first rectifier output coupled to one end of the series connection of the light emitting unit and the variable current source, and a second rectifier output. The output circuit is coupled between the second rectifier output and another end of the series connection of the light emitting unit and the variable current source, and is configured to generate a direct-current (DC) output voltage. | 02-19-2015 |
20150054416 | ADAPTATION CIRCUIT FOR COUPLING LED TO BALLAST - Adaptation circuits ( | 02-26-2015 |
20150061517 | Driving Circuit for Driving LED Load - A driving circuit includes a rectifier circuit and a LED driver integrated circuit. The rectifier circuit rectifies an ac power supply into a de power supply. The LED driver integrated circuit includes a regulator circuit, a voltage detector, a buck boost LED driver, and a common ground terminal. The regulator circuit regulates the dc power supply into a regulated voltage. The voltage detector detects whether the regulated voltage meets a voltage requirement and output the regulated voltage when the voltage requirement is met. The buck boost LED driver converts the regulated voltage detected into an output driving voltage according to a remaining voltage at a negative terminal of the LED load to drive the LED load. Voltage potentials at the common ground terminal and at a load ground terminal of the LED load are the same. | 03-05-2015 |
20150061518 | LIGHT ADJUSTING DEVICE WITH SWITCHING ELEMENT - A light adjusting device for adjusting the luminance of a light source is provided. The light adjusting device comprises a rectifier module, a first switch element, a second switch element and a control module. The rectifier module receives an AC signal from a first power node and a second power node, and rectifies the AC signal to output a driving signal to the light source. The first switch element is coupled to the first power node. The second switch element is coupled to the second power node. The control module outputs a control signal to the first and second switch elements to control the conduction states of the first and second switch elements. When the first and second switch elements are turned on, the driving signal provided to the light source is interrupted. | 03-05-2015 |
20150061519 | Control Apparatus, Control System, and Control Method - According to one embodiment, there is provided a control apparatus including a receiving section, a specifying section, and control sections. The receiving section receives a control signal. The specifying section specifies a control system corresponding to the control signal received by the receiving section. The control sections derive, according to the control system specified by the specifying section, control designated by the control signal received by the receiving section, and apply the derived control to a lighting device. | 03-05-2015 |
20150061520 | lamp device and a method for operating a lamp device - According to one embodiment there is provided a lamp device ( | 03-05-2015 |
20150061521 | METHOD AND APPARATUS FOR CALCULATING AN AVERAGE VALUE OF AN INACCESSIBLE CURRENT FROM AN ACESSIBLE CURRENT - In a power converter, a circuit determines an average value of an inaccessible current from an average value of an accessible current and a value of the operating duty cycle of the converter. A method of measuring an average value of an inaccessible current from a measured value of a current in a power converter by a duty cycle of a pulse width modulation (PWM) signal representing a duty cycle of the power converter. Coupling a voltage representing the measured value to an input of a low pass filter during a time period (D) and coupling the input of the low pass filter to a reference voltage during a time period (1−D). | 03-05-2015 |
20150061522 | METHOD AND APPARATUS FOR CALCULATING AN AVERAGE VALUE OF AN INACCESSIBLE CURRENT FROM AN ACESSIBLE CURRENT - In a power converter, a circuit determines an average value of an inaccessible current from an average value of an accessible current and a value of the operating duty cycle of the converter. A method of measuring an average value of an inaccessible current from a measured value of a current in a power converter by a duty cycle of a pulse width modulation (PWM) signal representing a duty cycle of the power converter. Coupling a voltage representing the measured value to an input of a low pass filter during a time period (D) and coupling the input of the low pass filter to a reference voltage during a time period (1−D). | 03-05-2015 |
20150061523 | CAPACITOR STEP-DOWN LED DRIVER AND DRIVING METHOD USING THE SAME - The present disclosure relates to a capacitor step-down LED driver and a driving method using the same. A capacitor step-down LED driver comprises a control circuit and a switching circuit. The control circuit turns on or off the switching circuit in response to an output current and an output voltage of the capacitor step-down LED driver, and thus controls an amount of energy supplied from an input side to an output side. In a first operation state, the switching circuit is controlled not to supply energy from the input side to the output side. In a second operation state, the switching circuit is controlled to supply energy from the input side to the output side. Thus, the output current is maintained to be a value of a desired driving current. | 03-05-2015 |
20150061524 | LIGHT-EMITTING DIODE DRIVING APPARATUS AND SEMICONDUCTOR DEVICE - A light-emitting diode driving apparatus including a rectifying circuit, a switching element, a choke coil, an output current sensing circuit, an LED light source, a rectifier diode, a control circuit, and a feedback sensing circuit which is connected to the output current sensing circuit for receiving an output feedback signal output from the output current sensing circuit, wherein the feedback sensing circuit outputs a feedback dummy signal, and outputs to the control circuit a control signal that controls switching of the switching element in response to a signal based on an error between the output feedback signal and the feedback dummy signal. | 03-05-2015 |
20150069924 | AC/DC POWER CONVERTER - In one embodiment, an AC/DC power converter can include: a rectifier bridge and a filter capacitor for converting an external AC voltage to a half-sinusoid DC input voltage; a first storage component, where during each switching cycle in a first operation mode, a first path receives the half-sinusoid DC input voltage to store energy in the first storage component, and a first current through the first storage component increases; a second storage component, where a second path receives a second DC voltage to store energy in the second storage component, and a second current through the second storage component increases; and a third storage component, where in a second operation mode, the first current decreases to release energy from the first to the third storage component, where the second DC voltage includes a voltage across the third storage component through a third path. | 03-12-2015 |
20150077003 | METHOD FOR OPERATING AN LLC RESONANT CONVERTER FOR A LIGHT-EMITTING MEANS, CONVERTER, AND LED CONVERTER DEVICE - An LLC resonant transformer ( | 03-19-2015 |
20150084528 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a rectifier circuit, a smoothing capacitor, and a normally on type transistor. The rectifier circuit is configured to rectify an alternating current supplied from a voltage source. The smoothing capacitor is charged by an output current output from the rectifier circuit. The normally on type transistor is connected between the rectifier circuit and the smoothing capacitor in series and is configured to limit an output current value of the rectifier circuit during a voltage input from the voltage source to an output current value higher than an output current value of the rectifier circuit during a steady operation. | 03-26-2015 |
20150084529 | Power Supply Device, Luminaire, and Lighting System - According to one embodiment, a power supply device includes a terminal connected to an output of a dimmer, a rectifier circuit, a switching circuit including an inductor, a switching element connected to the inductor in series, and a first rectifying element and configured to change the switching element to an ON state to feed an output current of the rectifier circuit to the inductor, after the dimmer changes from a non-conduction state to a conduction state, when the dimmer is a dimmer of a phase control type, and configured to change the switching element to the ON state to feed the output current of the rectifier circuit to the inductor, after the dimmer changes from the non-conduction state to the conduction state, when the dimmer is a dimmer of an anti-phase control type, and a DC-DC converter configured to convert the output voltage of the switching circuit. | 03-26-2015 |
20150084530 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a conductive first mounting board, a first switching element, a current control element, and a second switching element. The first switching element is mounted on the first mounting board. The current control element is mounted on the first mounting board, includes a main terminal connected to the first mounting board, is connected to the first switching element in series, and is configured to limit an electric current of the first switching element. The second switching element is connected to the current control element in series. An electric current flows to the second switching element when the first switching element is off. | 03-26-2015 |
20150084531 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a first inductor, a current control section configured to limit a current value of an electric current flowing through the first inductor to a predetermined current value, the current control section including a first switching element of a normally on type and a resistor connected to a main terminal of the first switching element, a rectifying element connected to the current control section in series, and a second inductor magnetically coupled to the first inductor. The second inductor is configured to induce a voltage for turning on the current control section, when the electric current of the first inductor increases, to induce a voltage for turning off the current control section, when the electric current of the first inductor decreases, and to supply the induced voltage to a control terminal of the current control section. | 03-26-2015 |
20150091456 | SINGLE-STAGE AC-DC POWER CONVERTER WITH FLYBACK PFC AND IMPROVED THD - A single-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The AC-DC power converter includes a high power factor correction (PFC) circuit configured in a flyback topology and operating in transition mode. The flyback PFC circuit has a PFC controller and is configured to draw an input AC current from an AC power supply. The input AC current has a first total harmonic distortion (THD). The flyback PFC circuit outputs a DC current to the load. The PFC controller is configured to sense a rectified input voltage. By multiplying the rectified input voltage sensed by the PFC controller, the input AC current drawn by the flyback PFC circuit has a second, much improved THD, which is achievable without the need of an expensive PFC controller. The rectified input voltage sensed by the PFC controller is multiplied using a Zener diode ladder. | 04-02-2015 |
20150091457 | SINGLE-STAGE AC-DC POWER CONVERTER WITH FLYBACK PFC AND SELECTABLE DUAL OUTPUT CURRENT - A single-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The AC-DC power converter includes a high power factor correction (PFC) circuit configured in a flyback topology and operating in transition mode. The flyback PFC circuit outputs a direct current (DC) voltage and a DC current. The PFC circuit further includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided to the load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents. The switch circuit includes a switch and three, fast Schottky diodes. | 04-02-2015 |
20150091458 | TWO-STAGE AC-DC POWER CONVERTER WITH SELECTABLE DUAL OUTPUT CURRENT - A two-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The first stage of the AC-DC power converter includes a conventional power factor correction (PFC) circuit that outputs a direct current (DC) voltage and a DC current. The second stage of the AC-DC power converter includes a low voltage flyback circuit that receives the DC voltage and the DC current. The low voltage flyback circuit includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided by the low voltage flyback circuit to the load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents. | 04-02-2015 |
20150091459 | Power Supply Circuit and Luminaire - A power supply circuit includes a bridge circuit, a transformer, a rectifying and smoothing circuit, a driver, a feedback circuit, and a power supply section. The bridge circuit converts a direct-current voltage into an alternating-current voltage. The transformer includes a primary winding wire and a secondary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. The driver controls ON and OFF of the switching element. The feedback circuit receives a detection signal of an output current flowing to the direct-current load and a differential signal obtained from fluctuation of the output voltage and feedback-controls the driver on the basis of the signals. The power supply section generates a driving voltage corresponding to the feedback circuit from the output voltage and supplies the driving voltage to the feedback circuit. | 04-02-2015 |
20150091460 | Power Supply Circuit and Luminaire - According to one embodiment, there is provided a power supply circuit including a direct-current voltage source, a bridge circuit, a transformer, and a rectifying and smoothing circuit. The bridge circuit includes at least one switching element and converts a direct-current voltage supplied from the direct-current voltage source into an alternating-current voltage according to ON and OFF of the switching element. The transformer includes a primary winding wire connected to the bridge circuit and a secondary winding wire magnetically coupled to the primary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage output from the secondary winding wire into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. The bridge circuit includes a capacitor connected between the primary winding wire and a terminal on a low potential side of the direct-current voltage source. | 04-02-2015 |
20150091461 | Power Supply Device and Lighting Device - According to one embodiment, there is provided a power supply device which includes a power conversion circuit which outputs an input power to an LED element as a load by converting the input power into a predetermined output power; and a control circuit which performs a feedback control of the power conversion circuit by detecting the output power of the power conversion circuit, and performs a dimming control which causes the LED element to be subject to a dimming operation based on a dimming signal which is output from a dimmer, in which, when a dimming OFF signal is input, the power conversion circuit outputs power which causes the LED element to be turned off while continuing an operation of the power conversion circuit. | 04-02-2015 |
20150102739 | Lighting Device - A system is described for providing unconditioned power using an alternating current (AC) power source in order to power light emitting diodes (LEDs). The system may include a plurality of light emitting diodes (LEDs), a microprocessor to send pulse-width modulated power signals to power the plurality of LEDs, a zener diode to limit a voltage provided to the microprocessor from the AC power source, and a varistor in series with the zener diode to clamp down the voltage from the AC power source to a pre-defined value to resist current in rush to the microprocessor. | 04-16-2015 |
20150102740 | Circuit and Method for Detecting the Duration of the Interruption of a Mains Input - A light bulb assembly comprises an electrical connection module, a driver circuit configured to provide electrical energy at a drive voltage, and a light source. The driver circuit converts electrical energy at an input voltage to the electrical energy at the drive voltage. A controller is configured to control the power converter to provide electrical energy at the drive voltage. The controller stops operation at an interruption of electrical energy to the driver circuit. The controller is configured to resume operation subsequent restoration of electrical energy to the driver circuit. The controller is configured to maintain the timing voltage above a first voltage level when the controller is in operation and to determine the duration of an interruption of electrical energy to the driver circuit. | 04-16-2015 |
20150115821 | LIGHT EMITTING DIODE DRIVER AND METHOD OF CONTROLLING THE SAME - There is provided a light emitting diode (LED) driver including: a power supplying unit including a dimmer and a rectifying unit and supplying a supply voltage to an LED device; and a control unit acquiring section information regarding the supply voltage and setting an LED on-time based on the section information. | 04-30-2015 |
20150115822 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode (LED) driving apparatus may include: a power converting unit switching input power to supply driving power to at least one LED; and a driving controlling unit controlling the supplying of the power of the power converting unit based on a switching period of the power converting unit and a demagnetization time in the switching period. | 04-30-2015 |
20150123553 | MULTI-CONTROL LIGHT REGULATOR - A multi-control light regulator includes a microprocessor, a regulator including a rectifier electrically connected to a power source and a LED lamp and a drive circuit electrically connected to the rectifier and the microprocessor, and a sensor electrically connected to the microprocessor and the power source. Thus, the microprocessor determines the LED lamp to be dimmable or non-dimmable subject to the operation of the regulator and gives a proper control to the LED lamp. | 05-07-2015 |
20150130362 | SPARK GAP ARRANGEMENT - A spark gap arrangement comprises a triggerable spark gap (TF) and a trigger circuit (TRG), which comprises a first and a second charge store (C | 05-14-2015 |
20150137690 | POWER SUPPLY MODULE FOR ENERGY SAVING LAMP - A power supply module ( | 05-21-2015 |
20150137691 | HALF-BRIDGE INVERTER, ELECTRONIC BALLAST AND LIGHTING DEVICE WITH THE HALF-BRIDGE INVERTER - The invention discloses a half-bridge inverter which includes first and second inverter input terminals for receiving a direct current (DC) voltage, first and second inverter switches, first and second drive circuits, and an inverter startup circuit. The first and second drive circuits are adapted to alternatively turn on and turn off the first and second inverter switches, which can convert the DC voltage to a high frequency alternating current (AC) voltage. The inverter startup circuit includes a capacitor, diode, and resistor. The capacitor and diode are connected in parallel and further electrically connected in a drive circuit in series. The resistor is electrically coupled to the first inverter input terminal and to the capacitor/diode parallel combination. The inverter startup circuit is used to trigger the first or second inverter switch. An electronic ballast containing the half-bridge inverter and a lighting device containing said electronic ballast are also disclosed. | 05-21-2015 |
20150137692 | LOAD CONTROL DEVICE FOR HIGH-EFFICIENCY LOADS - A two-wire load control device (such as, a dimmer switch or an electronic switch) for controlling the power delivered from an AC power source to an electrical load includes a controllably conductive device for controlling the power to the load, a microprocessor operable to generate a control signal that is representative of whether the load should be controlled on or off, a capacitor operable to produce a supply voltage for powering the microprocessor, a power supply that charges the capacitor when the controllably conductive device is non-conductive, and a control circuit that receives the control signal from the microprocessor. The control circuit is operatively coupled to the controllably conductive device for maintaining the controllably conductive device non-conductive after the beginning of each half-cycle until the magnitude of the supply voltage exceeds a predetermined threshold. | 05-21-2015 |
20150305102 | LED DRIVER CIRCUIT HAVING EFFICIENCY-IMPROVING FUNCTION - An LED driving circuit having an efficiency improvement function and connected to an alternating current (AC) power supply, includes: a rectifier circuit that rectifies the AC power supply; a control circuit connected to an output of the rectifier circuit; an LED load and a constant-current circuit that are connected to an output of the control circuit in series; a capacitor that is connected in parallel to the LED load and the constant-current circuit that are connected in series to each other, the capacitor smoothing the output of the rectifier circuit; and a detection circuit that detects whether the rectified voltage exceeds a predetermined particular voltage value that is equal to or greater than the sum of a voltage applied to the LED load when the LED load is turned on and a voltage applied to the constant-current circuit at a time when the LED load starts being turned on. | 10-22-2015 |
20150327340 | SYNCHRONIZED PWM-DIMMING WITH RANDOM PHASE - PWM-based dimming techniques are provided for lighting systems. The techniques can be used to eliminate or otherwise reduce the potential for strobing and flickering, and may be implemented, for example, in a driver suitable for powering LED lighting systems, but can be used with other suitable light sources as well. In an example embodiment, the potential for line frequency induced flicker, or even line disturbances that are periodic with the line frequency, can be eliminated or reduced by synchronizing the PWM frequency to the line frequency or so-called mains frequency, and the potential for strobing can be eliminated or reduced by either using a randomized phase angle on a cycle-to-cycle basis or by using multiple PWM LED drive circuits all having constant cycle-to-cycle phase angle but a different phase angle from drive circuit to drive circuit (or different from LED string to LED string, as the case may be). | 11-12-2015 |
20150351188 | CONSTANT VOLTAGE AND CONSTANT CURRENT DRIVER CIRCUIT - A driver circuit for delivering a generally constant voltage to a load is disclosed. The driver circuit includes a source of incoming AC power, a rectifier, and a constant voltage driver. The rectifier is connected to the source of incoming AC power and produces a DC voltage. The constant voltage driver receives the DC voltage from the rectifier. The constant voltage driver includes a selectively activated switching element for receiving the DC voltage, a controller, and an output line. The controller receives the DC voltage and is configured to send a drive signal to the switching element in order to activate the switching element. The output line provides the generally constant voltage to the load. | 12-03-2015 |
20150359053 | LIGHTING CIRCUITS, LUMINARIES AND METHODS COMPATIBLE WITH PHASE-CUT MAINS SUPPLIES - Lighting circuits and luminaires and methods are disclosed which are operable with a phase-cut dimmer, each circuit comprising a rectifier having a low side output and a high side output; a switched mode converter comprising a switch and an inductor, having a high side input connected to a bus rail, and having a configuration to draw current across a complete mains cycle; a controller for the switched mode converter; a filter circuit connected between the rectifier high side output and the bus rail and comprising a capacitor connected between the high side output of the mains rectifier and ground; and a resistance connected between the low side output of the rectifier and ground. The value of the resistance may be such the RC time constant of the resistor and filter circuit is greater than the time required for any ringing in the circuit to fall to no more than 20 mA. | 12-10-2015 |
20150366008 | LED Retrofit Lamp With a Strike Barrier - A LED retrofit lamp for replacement of fluorescent lamp or tube driven by fluorescent ballast is provided. The retrofit lamp is compatible with the fluorescent ballast that requires the presence of a barrier for striking an arc voltage. The present invention provides a strike barrier—a controllable barrier that does not allow current conduction until a threshold voltage is reached. When a current above the threshold voltage passes through the strike barrier, the circuit latches and allows conduction at normal voltage. The present invention also provides a circuit that replicates the cathode heater resistance of a fluorescent lamp to rapid start and programmed start ballast. | 12-17-2015 |
20150366014 | DRIVING CIRCUIT, ILLUMINATION LIGHT SOURCE, AND ILLUMINATION DEVICE - A driving circuit includes a rectifying and smoothing circuit that rectifies an AC dimming signal, and a voltage conversion circuit ( | 12-17-2015 |
20150373794 | ALTERNATING CURRENT RECTIFYING CIRCUIT AND ALTERNATING CURRENT RECTIFYING METHOD FOR DRIVING LED MODULE - Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module. The method comprises: when an alternating current module is in a positive half cycle, after an alternating current output by the alternating current module is rectified, outputting the alternating current to a positive half cycle rectifying branch circuit of an external LED module; when the alternating current module is in a negative half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the positive half cycle, carrying out discharging, and outputting the alternating current to a positive half cycle feed branch circuit of the external LED module; when the alternating current module is in the negative half cycle, rectifying the alternating current output by the alternating current module, and outputting the alternating current to a negative half cycle rectifying branch circuit of the external LED module; when the alternating current module is in the positive half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the negative half cycle, carrying out discharging, and outputting the alternating current to a negative half cycle feed branch circuit of the external LED module. By using the present invention, stability of an output voltage can be improved, and luminous efficiency of the LED module can be improved. | 12-24-2015 |
20150373802 | LIGHTING APPARATUS AND DIMMING REGULATION CIRCUIT THEREOF - The present invention discloses a dimming regulation circuit which stabilizes a rectified voltage in response to an unstable output voltage of a dimmer and a lighting apparatus including the dimming regulation circuit. The dimming regulation circuit stabilizes the rectified voltage and provides the stabilized rectified voltage to a lamp, when a rectified voltage corresponds to a preset stabilization required range. | 12-24-2015 |
20150382416 | SWITCHABLE LUMINANCE LED LIGHT BULB - A switchable luminance LED light bulb, including embodiments that may be used with any common commercial fitting. | 12-31-2015 |
20160007416 | LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES AND LINE/LOAD REGULATION CONTROL - An LED lighting device includes multiple luminescent devices driven by a rectified AC voltage. The multiple luminescent devices are turned on flexibly in a multi-stage driving scheme using multiple current controllers. The current settings of the two driving stages with the highest current level and the second highest current level are adjusted according to the variation in the rectified AC voltage V | 01-07-2016 |
20160014863 | CIRCUITS AND METHODS FOR REDUCING FLICKER IN AN LED LIGHT SOURCE | 01-14-2016 |
20160021715 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF - The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) circuit, a current limit (CL) circuit, and a determination circuit. The CL circuit generates a CL signal according to a current sense signal and a predetermined CL threshold. The determination circuit is coupled to the PWM circuit and the CL circuit, for generating an operation signal according to a PWM signal and the CL signal. The power stage circuit maintains an absolute level of an AC dimming current not lower than a holding current in an ON phase period. | 01-21-2016 |
20160044755 | DIMMING CIRCUIT AND METHOD FOR LEDS - The present disclosure relates to dimming circuit and method for LEDs. The dimming circuit obtains a DC voltage from an external AC power supply by using a TRIAC, an electronic transformer, and a rectifier bridge sequentially. The dimming circuit comprises a first power stage circuit, a second power stage, a first control circuit, and a second control circuit. The first power stage circuit has an input terminal configured to receive the DC voltage. The second power stage has an input terminal coupled to an output terminal of the first power stage and an output terminal coupled to an LED load. The first control circuit is configured to generate a first control signal in accordance with a first output voltage generated at the output terminal of the first power stage circuit, a first reference voltage and an upper threshold voltage to maintain an average value of the first output voltage to be consistent with the first reference voltage. The second control circuit is configured to generate a dimming signal in accordance with a first current and the first output voltage to control an operation of the second power stage circuit to maintain an output current of the second power stage circuit to be consistent with an expected driving current represented by the dimming signal. The first current is no less than a holding current of the electronic transformer. An input current of the first power stage circuit is maintained to be consistent with the first current by the first control signal when the first output voltage is in a continuously increasing state and is lower than the upper threshold voltage. The first output voltage decreases continuously and the input current is maintained to be consistent with a second current after the first output voltage reaches the upper threshold voltage. | 02-11-2016 |
20160049881 | MULTIPLE INDUCTIVE COMPONENT - A multiple inductive component ( | 02-18-2016 |
20160050724 | System and Method for Providing Surge Protection for an AC Direct Step Driver Lighting System - An AC direct driver lighting system including a surge protection circuit and a current limiting circuit is disclosed. According to one embodiment, the AC direct driver lighting system includes an LED load, a rectifier, and an LED driver configured to receive rectified AC voltage from an AC power source and drive the LED load. The AC direct driver lighting system further includes a surge protection circuit and a current limiting circuit disposed between the AC power source and the LED load. The surge protection circuit and the current limiting circuit suppress excessive current flowing through the AC direct driver lighting system. | 02-18-2016 |
20160057821 | Illumination Module - A lighting module includes a compatible part to transform and output an output voltage from a ballast, a transformation part to transform and output an output voltage from the compatible part, and a lighting part to emit light using an output voltage from the transformation part as a driving voltage. In the compatible part, a number of ports to receive the output voltage from the ballast is different form a number of ports to output the transformed output voltage to the transformation part. | 02-25-2016 |
20160057843 | Electrodeless Fluorescent Ballast Driving Circuit and Resonance Circuit with Added Filtration and Protection - A ballast circuit for a lighting system using an induction fluorescent lamp utilizes an AC-DC rectification circuit, a DC-DC boost power conversion circuit, a DC-AC half bridge inverter circuit, and a resonating circuit to ignite the lamp and maintain substantially constant power output of the lamp, while the DC-AC half bridge inverter circuit is further comprised of a gate isolation transformer connected in a half bridge inverter schematic which uses a ballast integrated circuit (IC) to drive a high side MOSFET and a low side MOSFET and the gate isolation transformer electrically isolates a gate signal to the high side MOSFET. | 02-25-2016 |
20160065055 | CIRCUIT AND METHOD OF CORRECTING A POWER FACTOR FOR AC DIRECT LIGHTING APPARATUS - A circuit for correcting a power factor for an AC direct lighting apparatus that includes a valley signal generating unit configured to receive a full-wave rectified AC input voltage signal and configured to compare an internal reference voltage signal and the AC input voltage signal to generate a valley signal, a reference voltage control unit configured to receive the generated valley signal and count clock cycles of an internal clock to detect a frequency of the AC input voltage signal and configured to determine a frequency of a drive current to control a reference voltage signal based on the determined frequency of the drive current and a reference voltage control clock generating unit configured to generate a pulse width modulation signal associated with a pulse width of the reference voltage signal and configured to generate the reference voltage control clock signal based on the generated pulse width modulation signal and the controlled reference signal. Thus, the circuit may control a phase of a drive current and adjust a variation of the reference voltage signal to improve the power factor of the circuit. | 03-03-2016 |
20160065085 | POWER SUPPLY DEVICE AND ILLUMINATION DEVICE - A power supply device includes a power supply input portion, a rectification portion, a smoothing portion, a power conversion portion, a power supply output portion, a signal input portion, a control portion, a circuit substrate, and a case. The circuit substrate is formed in an elongated rectangular plate-like shape. The power supply input portion is mounted on a first end portion of the circuit substrate in a longitudinal direction. The rectification portion, the smoothing portion, the power conversion portion, the control portion, and the power supply output portion are mounted on the circuit substrate in the stated order from the first end portion toward a second end portion in the longitudinal direction. The signal input portion is mounted at a position closer to the second end portion than the rectification portion in the circuit substrate. | 03-03-2016 |
20160066376 | ILLUMINATION LIGHT AND ILLUMINATION DEVICE - An illumination light includes: a bridge diode that performs full-wave rectification on an alternating-current signal; a switching converter that includes a switching device and that converts the alternating-current signal on which the full-wave rectification has been performed, into a direct-current signal; a controller that controls on/off timing of the switching device; and a semiconductor light emitting element that is connected to the switching converter and the controller and to which the direct-current signal is output. | 03-03-2016 |
20160066388 | LIGHTING APPARATUS AND LUMINAIRE - Lighting apparatus includes: AC/DC converter which converts AC voltage Vac to DC voltage Vdc; DC/DC converter which converts DC voltage Vdc to a DC voltage to be applied to LED; and detection circuit which detects AC voltage Vac. DC/DC converter includes switching element, and control circuit that performs a control of repeatedly turning on and off switching element in a boundary conduction mode. Control circuit performs the control under which ON time Ton is kept from exceeding an upper limit that is previously determined, and raises the upper limit when AC voltage Vac detected by detection circuit falls below a predetermined value. ON time Ton is a period of time during which switching element is kept ON. | 03-03-2016 |
20160073459 | LED LAMP DEVICE - Various embodiments relate to an LED lamp device. According to various embodiments, an LED lamp device is provided, including an LED unit for emitting light, a driving unit for driving the LED unit, such that the LED unit emits light at an operating point, and a resonance unit for receiving an input, providing AC power to the driving unit, and protecting the driving unit and the LED unit from being damaged by the input. | 03-10-2016 |
20160088700 | METHOD AND APPARATUS FOR DIGITAL DETECTION OF THE PHASE-CUT ANGLE OF A PHASE-CUT DIMMING SIGNAL | 03-24-2016 |
20160091146 | LIGHT EMITTING DIODE LIGHT BULB AND INCANDESCENT LAMP CONVERSION APPARATUS - Apparatus and methods separate the functions of light emission, heat dissipation, and power conversion in LED lighting. Doing so may facilitate cost-effective LED lighting and enable the conversion of existing incandescent lamps to LED service. An LED light bulb includes a thermal path from LED dies to a thermal transfer contact having an externally available surface. The LED light bulb and an incandescent lamp adapter are consumer-installable in an incandescent lamp. A heat spreader component of the lamp adapter contacts the thermal transfer contact of the LED light bulb to dissipate heat originating at the LED dies. A lamp adaptable LED power supply plugs into a standard AC power outlet and includes a receptacle to accept insertion of a lamp cord plug to deliver power to the LED light bulb. A lock-in safety device prevents retraction of the lamp cord plug from the LED power supply once inserted. | 03-31-2016 |
20160095174 | LED DRIVER CIRCUIT WITH OPEN LOAD DETECTION - Various examples directed to LED driver circuits capable of detecting the removal of an LED load are disclosed. In one example, the LED driver circuit may include a bleeder and load disconnect detection circuit having a bleeder circuit and a bleeder controller coupled to control the bleeder circuit. The bleeder controller may cause the bleeder circuit to draw a bleeder current that functions to supplement a load current drawn by an LED load to cause an input current of the LED driver circuit to be greater than a minimum holding current of a dimmer circuit. The bleeder controller may be further configured to detect a disconnect of the LED load based on the input current of the LED driver circuit, the bleeder control signal, and/or the bleeder current. In response to detecting a disconnect of the LED load, the bleeder controller may disable operation of the bleeder circuit. | 03-31-2016 |
20160119992 | Accurate Mains Time-Base for LED Light Driver - A controller for a driver circuit of a solid state lighting (SSL) device is described. The driver circuit comprises a power converter to transfer energy from AC mains voltage to the SSL device. The controller determines a dim level for the SSL device. The controller also determines a synchronization signal by comparing a voltage derived from the input voltage with a pre-determined threshold. The controller determines a sequence of PWM pulses based on the synchronization signal. The controller operates the power converter in a first operation mode for supplying energy to the SSL device at a first energy level within the sequence of PWM pulses, and operates the power converter in a second operation mode in between the PWM pulses. The second energy level is lower than the first energy level and the first energy level and/or a width of the PWM pulses depend on the dim level. | 04-28-2016 |
20160126860 | IMPROVEMENTS RELATING TO POWER ADAPTORS - A power adaptor is disclosed, which comprises an input for connection to an AC power supply, a resonant circuit coupled to the input that provides an output suitable for driving a load, at least one half-bridge drive circuit for providing a drive signal to the resonant circuit, and a switch controller for the half-bridge drive circuit. The switch controller is adapted to provide one or more of the following, in at least one mode: (i) to provide the high-side switch and the low-side switch with on-times of different durations, (ii) to provide the high-side switch and the low-side switch with on-times that overlap, and (iii) to provide the high-side switch and the low-side switch with on-times that are synchronous. This may be utilised to control the current delivered to the output without any need to change the frequency at which the resonant circuit is driven. | 05-05-2016 |
20160128142 | DRIVER DEVICE AND DRIVING METHOD FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT - The present invention relates to a driver device ( | 05-05-2016 |
20160134183 | VCC Charge and Free-Wheeling Detection via Source Controlled MOS Transistor - A driver circuit using a power converter allows free-wheeling detection and/or provision of supply voltage. A circuit controls a switching state of a power switch. A first port of the switch is coupled to an inductor. The circuit is coupled to a control port of the switch wherein the control port of the switch is different from the first port of the switch. The circuit comprises a unit generating a signal for controlling the switching state of the switch wherein the signal is provided to the control port of the switch. Furthermore, the circuit comprises free-wheeling sensing means to detect an oscillation of a voltage at a measurement port of the switch wherein the measurement port of the switch is different from the first port of the switch and wherein the oscillation of the voltage at the measurement port indicates free-wheeling of the inductor. | 05-12-2016 |
20160135258 | METHOD FOR MINIMIZING LED FLICKER OF AN LED DRIVER SYSTEM - A method for minimizing LED flicker of an LED driver system, the LED driver system comprising a PFC constant average current converter, a capacitor, an LED module, and a current regulator, the method including: a first step: the current regulator generating a control voltage according to an average of a difference between a reference voltage and a voltage at a second end of the LED module; and a second step: the current regulator determining a regulation value for a current flowing through the LED module according to the control voltage. | 05-12-2016 |
20160135260 | SWITCHING CIRCUIT FOR LIGHT-EMITTING DIODE - A switch circuit for light-emitting diode is provided. The switch circuit includes a power module, a light-emitting diode module, an inductor, a first switch, a second switch and a capacitor. When the input voltage of the power module is higher than the forward bias voltage of the light-emitting diode module, the first switch is switched repeatedly and the second switch is turned off, so that the power supply can charge the inductor and/or the capacitor. When the input voltage of the power module and the storage voltage of the capacitor both are lower than the forward bias voltage of the light-emitting diode module, the first switch and the second switch are controlled to switch repeatedly and synchronously, so that the power energy of the power module or the discharge energy of the capacitor can be used to continuously charge the inductor. | 05-12-2016 |
20160135263 | MODULARIZED LIGHT SYSTEM, CONTROL MODULE THEREOF AND POWER MODULE THEREOF - A modularized light system, a control module and a power module are provided. The modularized light system comprises at least a light module, a control module and a power module. The internal and external wiring of the power source is integrated into the power module. The wiring of the control circuit and the power transmission is integrated into the control module. The wiring of the power transmission and the light source is integrated into the light module. A novel design uses a single power module and a control module for transmitting and controlling the power to one or a plurality of light module. One or more connection units detachably connect the light modules. Thus, the system installation is simplified and design coordinated with advantages such as fast assembly, saving assemble time, saving effort, a neat appearance, no wire entanglement, and flexibility of extending lighting range can be achieved. | 05-12-2016 |
20160143104 | LED DRIVE CIRCUIT AND METHOD FOR DRIVING LED - An LED drive circuit and drive method thereof are provided. The drive circuit comprises: a rectifier circuit receiving a phase-control dimming signal with a conduction angle, and outputting a rectified signal; a converter comprising a switching element, with an input end coupled to the rectifier circuit and an output end coupled to an LED; and a controller having a first input end receiving the rectified signal, a second input end receiving a first sampling signal and an output end outputting a control signal according to the rectified signal and the sampling signal; wherein the switching element receives the control signal from the controller, thus executing an on/off operation to control current flowing through the LED. | 05-19-2016 |
20160150609 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME - A lighting device includes a rectifier circuit, a conversion circuit and a control circuit. A first inductor of a first series circuit and a second inductor of a second series circuit have inductances by which a time period, during which a diode is electrically conducted, is made shorter than a half period of a resonance period of a closed loop circuit. The closed loop circuit includes a first capacitor, the first inductor, a second capacitor and a third capacitor. The control circuit is configured to control a switching element in such a manner that the switching element is turned on at fixed periods. | 05-26-2016 |
20160150611 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME - A lighting device includes a rectifier circuit, a conversion circuit, a constant current circuit and a control circuit. The conversion circuit includes a first series circuit, a second series circuit and a third series circuit. The conversion circuit is configured to output a DC current by on/off of a switching element being controlled by the control circuit. A high potential-side terminal of the third capacitor is electrically connected to an output terminal. The low potential-side terminal of the third capacitor is electrically connected to an output terminal, via the constant current circuit. | 05-26-2016 |
20160165682 | LED DRIVING CIRCUIT OF MULTI-STAGE SWITCH BULB LAMP - An LED driving circuit of a multi-stage switch bulb lamp includes a power modulation module having a first switch, a second switch, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor and a fourth resistor. The first and second switches are respectively and serially connected to the first and second transistors, the first transistor is electrically connected to the second resistor, the other end of the second resistor is serially connected to the third resistor to form a reference voltage node and has a reference voltage, the first and second transistors are electrically connected to the reference voltage node, the other end of the third resistor is serially connected to the fourth resistor, and the second transistor is electrically connected to the third resistor. The first and second switches may be turned on/off to adjust the reference voltage value and change the power. | 06-09-2016 |
20160165688 | SEMICONDUCTOR DEVICE AND POWER SUPPLY DEVICE - A power supply topology is used in which a transistor is provided on the side of an output node of a rectifying circuit. An inductor is provided on the side of a reference node, a resistor is inserted between the transistor and the inductor, and one end of the resistor is coupled to a ground power supply voltage of a PFC circuit. The PFC circuit includes a square circuit which squares a result of multiplication of an input voltage detection signal and feedback information (output voltage of an error amplifier circuit). The PFC circuit drives on the transistor when a detection voltage developed at the resistor reaches zero, and drives off the transistor when the detection signal reaches an output signal of the square circuit. | 06-09-2016 |
20160174340 | DIGITAL COMMUNICATION RECEIVER INTERFACE CIRCUIT FOR LINE-PAIR WITH DUTY CYCLE IMBALANCE COMPENSATION | 06-16-2016 |
20160181063 | COMPACT, CONFIGURABLE POWER SUPPLY FOR ENERGIZING OZONE-PRODUCING CELLS | 06-23-2016 |
20160198532 | LIGHTING DEVICE AND LIGHTING FIXTURE USING SAME | 07-07-2016 |
20160198537 | LED DRIVER CIRCUIT USING FLYBACK CONVERTER TO REDUCE OBSERVABLE OPTICAL FLICKER BY REDUCING RECTIFIED AC MAINS RIPPLE | 07-07-2016 |
20160205756 | METHOD AND APPARATUS FOR DETERMINING A TARGET LIGHT INTENSITY FROM A PHASE-CONTROL SIGNAL | 07-14-2016 |
20160381754 | Dimmable Universal Voltage LED Power Supply with Regenerating Power Source Circuitry and Non-Isolated Load - A light-emitting diode (LED) lighting device has an LED and a power supply including an inductor coupled to the LED. A cathode of the LED is coupled to the inductor opposite an anode of the LED. The inductor is coupled for receiving a first power signal. A transistor includes a conduction terminal coupled to the inductor to enable current through the inductor. A current from the first power signal is switched to generate a second power signal. A first diode includes an anode coupled to the inductor opposite the cathode of the LED. A controller includes a first terminal coupled to a cathode of the first diode and a second terminal coupled to a control terminal of the transistor. A zener diode is coupled to the first terminal of the controller. A capacitor is coupled between the first diode and inductor. A second diode is coupled to the first diode. | 12-29-2016 |
20190149051 | A BIFRED CONVERTER AND A METHOD OF DRIVING AN OUTPUT LOAD | 05-16-2019 |
20190150240 | TRIAC Dimmer Detection Circuit, Chip and Method, and LED Driving Chip and System | 05-16-2019 |
20090045754 | FLASH PATTERN SELECTION VIA POWER SWITCH - Lighting apparatus, systems and methods are disclosed. One lighting apparatus includes a light source, a power source in electrical communication with the light source, and a power button arranged to control electrical flow from the power source to the light source. The lighting apparatus also includes a programmable circuit in electrical communication with the power button, where the programmable circuit is programmed to set predetermined flash patterns for illuminating the light source in response to detecting a predetermined sequence of actuations of the power button. | 02-19-2009 |
20090085490 | Light Emitting Diode Driver Circuit With Shunt Switch - A LED driver circuit avoids undesirable light generated by a LED due to leakage current by shunting the output terminal to the feedback terminal during periods when it is desired that the LED remain turned off. The shunting operation is achieved by providing a switch (e.g., a FET) that is connected between the output and feedback terminals of the LED, and is controlled by the user supplied reference signal. During active operation (i.e., when the user supplied reference signal is “enabled” and the LED is lit), the switch remains open, allowing the driver circuit to generate the desired driving voltage across the LED. During inactive periods (i.e., when the user supplied reference signal is “disabled” and the LED is intended to be off), the switch is closed, which couples the output and feedback terminals to generate an essentially zero voltage drop across the LED. | 04-02-2009 |
20090309505 | AC ILLUMINATION APPARATUS WITH AMPLITUDE PARTITIONING - A method includes rectifying AC power and controlling switching of first, second and third currents from and rectified power and a switching sequence that is locked to the AC cycle time by sensing an amplitude of at least one of the AC power and the rectified power. The first, second and third currents are conducted through corresponding first, second and third series of color light emitting devices of different colors. The switching sequence repeats at least twice each AC cycle time. | 12-17-2009 |
20100060178 | METHOD AND APPARATUS FOR MAXIMIZING THE SUSTAINABLE FLASH OF A HANDHELD PORTABLE ELECTRONIC DEVICE - A method and apparatus for maintaining a maximum sustained flash current over the whole length of a flash using a programmable current drive in a handheld portable device powered by a battery. The method involves measuring the battery voltage before and after a flash is initiated and calculating the equivalent series resistance (ESR) of the battery. The calculated ESR is then used to adjust the flash current. The process may be repeated to correct for errors in the flash current. | 03-11-2010 |
20110279046 | INTELLIGENT USER INTERFACE INCLUDING A TOUCH SENSOR DEVICE - The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a microchip in communication with the switch wherein the switch is only capable of transmitting a signal to the microchip that the switch has been activated or deactivated. The microchip is in communication with the exhaustible power source of the electronic device and controls (i) the power on/off function of the device, (ii) at least one other function of the device in response to activation and deactivation signals from the switch, and (iii) an automatic shut off function in response to the receipt of an activation signal from the switch. | 11-17-2011 |