| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 315206000 | Discharge device and/or rectifier in the primary circuit of the supply transformer | 54 |
| 20080290808 | POWER SUPPLY APPARATUS FOR ARC-GENERATING LOAD - An output of a rectifying circuit ( | 11-27-2008 |
| 20080303447 | INVERTER APPARATUS - An inverter converts input voltage to AC driving voltage to supply it to a load. Secondary coil of an output transformer are connected to the load. Secondary coil of a main transformer are connected to the primary coil of the output transformer. A driving circuit applies switching voltage alternately repeating the input voltage and ground voltage to the primary coil of the main transformer. | 12-11-2008 |
| 20090079353 | MAGNETRON DRIVE POWER SUPPLY - An object of the invention is to provide a magnetron drive power supply for performing stable inverter operation and good in development efficiency. | 03-26-2009 |
| 20090184649 | CURRENT BREAKING CONTROLLER FOR A LAMP AND LANTERN - An overcurrent breaking controller for a lamp and lantern comprises a trigger control unit connected to an AC power, a current transformer connected between the trigger control unit and the lamp and lantern, and an overcurrent restraint unit connected to the trigger control unit and the current transformer. When the lamp and lantern works with a current exceeding a rated power, the overcurrent restraint unit instantly controls the trigger control unit to stop triggering; after the current drops, the AC power is re-supplied to make the lamp and lantern become bright. Thus, the current of the consumed power of lamp and lantern is restrained and automatically returns for achievement of forced power saving and easy installation. | 07-23-2009 |
| 20090200951 | Methods and Apparatus for Dimming Light Sources - Methods and apparatus for dimming light sources are described herein. In the described examples, a bias circuit selectively biases a switch during a half-cycle of a line current after a delay. In some examples, the delay of the bias circuit is adjustable by a user to adjust the amount of light a light source emits. A charge circuit substantially biases the switch for a period of time in the event the bias circuit experiences an operating condition that may cause the switch to become open during the half-cycle of the line current. As a result of the charge circuit, the light source coupled to the line current does not experience substantial flickering. | 08-13-2009 |
| 20090200952 | METHODS AND APPARATUS FOR DIMMING LIGHT SOURCES - Methods and apparatus for dimming light sources are described herein. In certain embodiments, a bias circuit selectively biases a solid state switch during a portion of half-cycle of a line voltage after a settable delay. In some embodiments, the delay of the bias circuit is adjustable by a user, which varies the amount of energy provided to a light source, and the light generated there from. A charge circuit biases the switch for a period of time in the event the bias circuit experiences an operating condition (a ringing current) that may cause the switch to become open during the half-cycle of the line current. As a result of the charge circuit, the light source coupled to the line current does not experience substantial flickering and is compatible with low power compact fluorescent lights. The dimmer can be combined with other components to form a light harvesting system. | 08-13-2009 |
| 20100109539 | Power converter and power conversion method with reduced power consumption - A power converter and power conversion method converts an input AC signal to a voltage usable by a load while reducing power consumption, thereby making the converter and method suitable for a wider range of applications. A rectifier receives the AC input signal and outputs a rectified voltage Vs, a controller has a power input connected to Vs and outputs two out-of-phase signals, two transistors are connected in series between Vs and a ground and each of the two transistors has a gate connected to a respective one of the two out-of-phase signals, and a transformer that has a primary coil connected to a node between the two transistors and a secondary coil connected to a load feeds back current from the secondary coil to the power input of the controller to reduce power consumption. | 05-06-2010 |
| 20110101877 | LED DRIVER WITH OPEN LOOP DIMMING CONTROL - An LED driver with open loop dimming including a full wave rectifier circuit, a DC/DC converter, and an oscillator circuit. The rectifier is configured to receive an input voltage in the form of an AC conductive angle modulated voltage and to provide a rectified voltage. The DC/DC converter converts the rectified voltage to an output voltage and an output current, where the output current has a magnitude which varies proportionately with a square of a quadratic mean of the input voltage. The oscillator circuit controls switching of the DC/DC converter with constant frequency and constant duty cycle. The DC/DC converter may be a flyback converter and may include a transformer operated in DCM. The driver may include output voltage and/or output current limit. The output current may be limited when the input voltage is within normal operating range of an AC line voltage from which the input voltage is derived. | 05-05-2011 |
| 20110298383 | ELECTRONIC OPERATING DEVICE FOR A GAS DISCHARGE LAMP - The invention relates to an electronic operating device for a gas discharge lamp having: a DC/DC voltage converter, a power factor correction circuit, an inverter, a lamp inductor, and having a full bridge with two half bridges which can be controlled separately, wherein the DC/DC voltage converter additionally acts as a voltage step-down converter, and the inverter additionally has the following functions: lamp current regulation, the function of stepping down the voltage to the lamp voltage, and resonant ignition. | 12-08-2011 |
| 20120001560 | ELECTRONIC BALLAST HAVING A PARTIALLY SELF-OSCILLATING INVERTER CIRCUIT - An electronic ballast for driving a gas discharge lamp comprises an inverter circuit that operates in a partially self-oscillating manner. The inverter circuit comprises a push-pull converter having a main transformer having a primary winding for producing a high-frequency AC voltage, semiconductor switches electrically coupled to the primary winding of the main transformer for conducting current through the primary winding on an alternate basis, and gate drive circuits for controlling the semiconductor switches on a cycle-by-cycle basis. The drive circuits control (e.g., turn on) the semiconductor switches in response to first control signals derived from the main transformer, and control (e.g., turn off) the semiconductor switches in response to second control signals received from a control circuit. The control circuit controls the semiconductor switches in response to a peak value of an integral of an inverter current flowing through the inverter circuit. | 01-05-2012 |
| 20120104958 | OPERATING CIRCUIT FOR LIGHT-EMITTING DIODES - A method is provided for operating at least one LED by a switched-mode regulator circuit to which a DC or a rectified AC voltage is supplied and which provides a supply voltage for at least one LED by a coil and a switch clocked by a control/regulation unit. When the switch is activated, power is temporarily stored in the coil and is discharged through a diode and through at least one LED when the switch is deactivated and the current flows through the LED through a first power storage element which is coupled to a second power storage element. The first power storage element just reaches its maximum capability of storing power due to the current flowing through the LED. A rising current is supplied to the second power storage element such that the time can be detected when the first power storage element recovers its capability of storing power. | 05-03-2012 |
| 20120139433 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A circuit for driving a light-emitting diode (LED) light source includes a converter, a saw-tooth signal generator, and a controller. The converter includes a switch which is controlled by a driving signal. The converter provides a sense signal indicating the current through said LED light source. The saw-tooth signal generator generates a saw-tooth signal based on the driving signal. The controller generates the driving signal based on signals including the saw-tooth signal and the first sense signal to adjust the current through the LED light source to a target level and to correct a power factor of the driving circuit by controlling an average current of the input current to be substantially in phase with said input voltage. | 06-07-2012 |
| 20120235588 | EFFICIENT ELECTRICALLY-ISOLATED POWER CIRCUITS WITH APPLICATION TO LIGHT SOURCES - Solid state light sources are compatible with AC phase-cut dimmers. The light sources may have switching mode power supplies having primary and secondary sides that are in first and second circuit parts that are electrically isolated from one another. Information regarding a waveform of input electrical power is extracted in the first circuit part and passed to a controller in the second circuit part by way of a galvanic isolator. Additional isolated paths may be provided to provide bi-directional exchange of information between the first and second circuit parts and/or to provide for the exchange of additional information relevant to control. The signal path from the first side to the second side may have a low latency. | 09-20-2012 |
| 20120242240 | BALLAST EFFICIENCY IMPROVEMENT FOR FLUORESCENT LAMPS - A half bridge resonant topology ballast for use with a fluorescent lamp includes a resonant tank and a resonance inductor having a secondary winding. The secondary winding is arranged for series connection to the fluorescent lamp, and the secondary winding provides a voltage that reduces the resonant tank voltage. | 09-27-2012 |
| 20120249004 | LUMINAIRE - When an operator operates an operation tool of a dimming operation terminal device in order to set the brightness of a lighting load to desired brightness, an energization electric signal, for example, a voltage level detected by a dimming control section changes. The dimming control section generates a dimming signal modulated according to the voltage level. Power supply to the dimming control section is performed by an insulated auxiliary power supply. Transmission of the dimming signal is performed via an insulating section. | 10-04-2012 |
| 20120249005 | LIGHT DRIVING APPARATUS - The present disclosure relates to a light driving apparatus which may stably drive an LED light at a normal operation by feeding back the output voltage of the LED light and stably drive the LED light at an abnormal operation by feeding back the voltage supplied to the LED light, and the light driving apparatus includes: a rectifier circuit; a transformer circuit; a power factor correction circuit; a smoothing circuit; a constant-current driving circuit; a dimming control circuit; a photo-coupler; a sample and hold circuit; a first photo-coupler driving circuit for feeding back the voltage output from the sample and hold circuit and applying the feedback voltage as a driving voltage of the photo-coupler; and a second photo-coupler driving circuit for feeding back the voltage output from the smoothing circuit and supplied to the LED module and supplying the feedback voltage as a driving voltage of the photo-coupler. | 10-04-2012 |
| 20120262079 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A circuit for powering a light source includes a filter, a transformer, and a controller. The filter receives an input voltage and filters the input voltage to provide a regulated voltage. The transformer converts the regulated voltage to an output voltage to power the light source. The controller generates a driving signal to alternately operate the switch between a first state and a second state. The controller corrects a power factor of the circuit by controlling time durations of the first state and the second state, such that an input current decreases to a predetermined level during the second state and increases from the predetermined level to a peak level proportional to the input voltage during the first state. The controller controls the ratio of time in the first state to time in the second state to adjust an output current flowing through the light source to a target level. | 10-18-2012 |
| 20120306396 | LED DRIVING APPARATUS AND METHOD - There are provided an LED driving apparatus and an LED driving method thereof. The LED driving apparatus includes: a light emitting unit including one or more LEDs, a rectifying unit rectifying an input signal to generate a first signal; a signal conversion unit inverting a waveform of a first signal to generate a second signal; and an operation unit arithmetically operating the first and second signals. A plurality of AC signals each having a different waveform are arithmetically operated to generate a signal having a small amount of a ripple component, and an LED is driven by the signal, thus preventing a lifespan of the LED from being shortened by omitting a smoothing electrolytic capacitor, one of main causes shortening the lifespan of an LED driving circuit. | 12-06-2012 |
| 20120319607 | LIGHTING CONTROLLING METHOD, LIGHTING APPARATUS AND LIGHTING SYSTEM - A lighting apparatus, a lighting system and a lighting control method are disclosed. The lighting apparatus includes an LED module, a heat sink for emitting heat generated from the LED module, a rectifier for rectifying an input commercial AC power, a transformer including a main coil and an auxiliary coil to transform the rectified power, and an electronic module for biasing a current used to drive the LED module based on the input voltage transported via the auxiliary coil. | 12-20-2012 |
| 20130015776 | RESONATE DRIVER FOR SOLID STATE LIGHT SOURCESAANM Simi; Victor M.AACI LexingtonAAST KYAACO USAAGP Simi; Victor M. Lexington KY US - A driver circuit, solid state light (SSL) source assembly including same, and a method of driving an SSL source are provided. The driver circuit includes a rectifier, an inverter, a transformer, a PFC circuit, and a frequency control. The rectifier receives an AC voltage and provides an unregulated DC voltage. The inverter includes two switches, and receives respective control signals to operate these, to generate a resonate AC signal from the unregulated DC voltage. The transformer includes a primary winding coupled to the inverter, a secondary winding to be coupled to an SSL source through an output stage, and a feedback winding. The PFC circuit controls the inverter in response to signals representative of the unregulated DC voltage and the inverter's current. The frequency control generates the control signals to control the inverter's switching frequency in response to signals representative of the output stage's current and the feedback winding's current. | 01-17-2013 |
| 20130026936 | DRIVING CIRCUIT SYSTEM FOR GAS DISCHARGE LAMP AND THE CONTROL METHOD THEREOF - A driving circuit system for a gas discharge lamp includes a power circuit having a switch for converting an input voltage into a lamp voltage for driving the gas discharge lamp, a lamp current detecting circuit connected to the power circuit or the gas discharge lamp for detecting a lamp current, a feedback circuit connected to the lamp current detecting circuit for generating a lamp current feedback signal, a constant power control circuit for generating a corrected current reference signal, and a power control circuit connected to the feedback circuit, the constant power control circuit, and the switch of the power circuit for generating a first modulating signal in accordance with the lamp current feedback signal and the corrected current reference signal for driving the switch to turn on or off, thereby substantially maintaining a lamp power of the gas discharge lamp at a constant value. | 01-31-2013 |
| 20130057173 | PRIMARY-SIDE CONTROLLED SWITCH-MODE POWER SUPPLY CONTROLLER FOR DRIVING LED WITH CONSTANT CURRENT AND METHOD THEREOF - The present invention discloses a primary-side controlled switch-mode power supply controller for driving LED with constant current and method thereof as well as an apparatus for controlling switch-mode power supply having the switch-mode power supply controller. The switch-mode power supply controller includes an input dimming phase detection circuit, a multiplier, a turn-on signal control circuit, a zero-crossing detection circuit, a comparator, a trigger and a driving circuit. The circuit controls to drive LED with constant current by means of a primary-side controlled method. The circuit realizes the triac dimming function, ensures a constant output current regardless of a high voltage or a low voltage, and obtains a high power factor. The direct use of the isolation transformer improves the safety of the circuit, and simplifies the peripheral circuit, thereby reducing the cost of the circuit and minimizing the size of the PCB layout, which is favorable in minimizing the product. | 03-07-2013 |
| 20130106303 | DIMMING CONTROL METHOD AND APPARATUS | 05-02-2013 |
| 20130134892 | ISOLATED POWER SUPPLY DEVICE AND ILLUMINATION DEVICE - An insulated power supply device includes: an electric power conversion unit, a rectifier, a filter, a detection unit, a control circuit, and a signal transmission unit. The control circuit generates and outputs a control signal for a switching element that controls a current to be flown through a primary side of the electric power conversion unit. The signal transmission unit transmits, to the control circuit, a detection signal by the detection unit for detecting an output current or an output voltage. An output control pulse signal having control information in a duty ratio can be supplied as an outputted control signal individually to both of the control circuit and a secondary side of the electric power conversion unit. The output current or the output voltage can be thereby controlled. | 05-30-2013 |
| 20130147378 | ELECTRONIC BALLAST - An electronic ballast for a light emitting load is provided, and includes a transformer module, a resonance module, a high-frequency push-pull inverter and a driving controller module. The high-frequency push-pull inverter includes a first switch component and a second switch component. The driving controller module is used for generating and providing an asymmetric driving waveform to the first switch component and the second switch component. The asymmetric driving waveform includes a first discharging waveform portion for discharging and turning off the first switch component, and also a second discharging waveform portion for discharging and turning off the second switch component. The first and second discharging waveform portions are different in current amplitudes and time spans. | 06-13-2013 |
| 20130169180 | DC/DC CONVERTER AND DRIVING APPARATUS HAVING THE SAME - There are provided a DC/DC converter and a driving apparatus having the same. The DC/DC converter includes a DC/DC converter part converting an input power into a predetermined DC power by switching the input power to thereby supply the converted DC power to a light emitting device; and a control part controlling switching of the DC/DC converter part in accordance with a driving signal applied to the light emitting device to thereby control a voltage level of the DC power. | 07-04-2013 |
| 20130175939 | BALLAST WITH AN ARC QUENCHING CIRCUIT - An arc detection circuit that detects an occurrence of arcing between ballast and a lamp is provided. A transformer has a primary side connected between the ballast and the lamp to receive lamp current and conduct the lamp current from the ballast to the lamp during normal operation. A secondary side of the transformer produces a transformer voltage as a function of the lamp current received by the primary side. The produced transformer voltage is less than a threshold value during normal operation and greater than the threshold value during an occurrence of arcing between the ballast and the lamp. The arc detection circuit reduces the produced transformer voltage and provides it to the ballast so as to shut down the ballast operation. | 07-11-2013 |
| 20130257304 | Switching Power Source Device and Illuminating Apparatus - A switching power source device includes: a direct power source; and a chopper circuit including a pair of input terminals connected to the direct power source and a pair of output terminals connected to a load, the chopper circuit including a first inductor, a second inductor magnetically coupled to the first inductor, a third inductor connected to the first inductor, a switching element causing an augmented current to flow from the direct power source to the first and third inductors while turned on, a constant current element connected to the switching element in series, a rectifier element causing a reduced current to flow through the first and third inductors while the switching element is turned off, and a drive circuit controlling and turning off a gate voltage of the switching element after the switching element is turned on and the augmented current reaches a constant current element saturated state. | 10-03-2013 |
| 20130271021 | POWER CONVERTER DEVICE FOR DRIVING SOLID STATE LIGHTING LOAD - A power converter device for converting power from a mains power supply ( | 10-17-2013 |
| 20130307429 | MULTIPLE VOLTAGE BALLAST - A ballast and method for operating a ballast includes a switch or other circuit for connecting and disconnecting a voltage multiplier to a rectifier circuit. A control circuit for controlling the switch senses an input voltage and connects the voltage multiplier to the rectifier circuit when an input voltage falls below a selected voltage level. | 11-21-2013 |
| 20140015432 | POWER SUPPLY, SOLID-STATE LIGHT-EMITTING ELEMENT LIGHTING DEVICE, AND LUMINAIRE - According to one embodiment, a power supply device includes a full-wave rectifier, a power converting circuit, and a partial smoothing circuit. The power converting circuit converts an output of the full-wave rectifier into a direct-current voltage according to a switching action of a switching element. The partial smoothing circuit includes, in series, a capacitor and a first diode connected in polarity opposite to output polarity of the full-wave rectifier. The partial smoothing circuit is provided on an output side of the full-wave rectifier in parallel to the power converting circuit. In the partial smoothing circuit, the capacitor is charged according to the switching action of the switching element of the power converting circuit. The partial smoothing circuit supplies charged electric of the capacitor to the power converting circuit via the first diode in a trough portion of an output voltage of the full-wave rectifier. | 01-16-2014 |
| 20140021879 | DIMMABLE LED DRIVER AND DRIVING METHOD - Disclosed are dimmable LED driver circuits and methods. A dimmable LED driver can include: an SCR, an electronic transformer, and a rectifier bridge to convert an AC voltage to a DC voltage signal; a power stage circuit that receives the DC voltage signal, and outputs a constant current to drive an LED load, where the power stage circuit includes first and second power stage circuits, the first power stage circuit receiving the DC voltage signal, and generating a first output voltage to the second power stage; and an input current control circuit that receives an input current of the first power stage circuit and the first output voltage, and generates a first control signal to control the input current as a square wave signal during an on time of the SCR, and the input current is substantially zero during an off time of the SCR. | 01-23-2014 |
| 20140111108 | SYSTEM CONTROL UNIT, LED DRIVER INCLUDING THE SYSTEM CONTROL UNIT, AND METHOD OF CONTROLLING STATIC CURRENT OF THE LED DRIVER - Embodiments of the present invention provide a light-emitting diode (LED) driver and method of controlling the static current of the LED driver. In some embodiments, the LED driver is configured to calculate output currents of a pulse form using a small number of parameters and adjust a gate control signal using the mean value of the output currents of a pulse form. Accordingly, the LED driver can be used to control a static current that flows through an LED array connected to a circuit on the secondary side of a transformer using a DC voltage or an AC voltage supplied to the primary side of the transformer. In some embodiments, the LED driver includes a power conversion unit, switching unit, transformer, zero current detection unit, and system control unit. In some embodiments, the system control unit is configured to adjust the gate control signal. | 04-24-2014 |
| 20140132170 | 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 |
| 20140132171 | 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 |
| 20140139129 | THYRISTOR DIMMING CIRCUIT WITH LOSSLESS DISCHARGING CIRCUIT AND METHOD THEREOF - Thyristor dimming circuits and methods are disclosed herein. In one embodiment, a thyristor dimming circuit can include: (i) a thyristor and a rectifier bridge configured to receive a sinusoidal AC voltage, and to generate a phase-loss input voltage; (ii) a power stage circuit configured to have the phase-loss input voltage applied thereto, the power stage circuit having a main switch and being configured to drive a lamp load through electrical conversion; and (iii) a discharging circuit configured, during a first predetermined time interval, to control the main switch to operate with a fixed duty cycle at a fixed frequency, where the first predetermined time interval begins prior to an absolute value of the sinusoidal AC voltage being reduced to zero, the first predetermined time interval ending when the phase-loss input voltage is again applied to the power stage circuit. | 05-22-2014 |
| 20140184087 | LUMINAIRE - When an operator operates an operation tool of a dimming operation terminal device in order to set the brightness of a lighting load to desired brightness, an energization electric signal, for example, a voltage level detected by a dimming control section changes. The dimming control section generates a dimming signal modulated according to the voltage level. Power supply to the dimming control section is performed by an insulated auxiliary power supply. Transmission of the dimming signal is performed via an insulating section. | 07-03-2014 |
| 20140252974 | LIGHTING APPARATUS - The present invention relates to a lighting apparatus which stably performs dimming control on a lamp implemented with light emitting diodes (LEDs) or the like. The lighting apparatus may improve power efficiency by driving power supplied to a lamp in a current regulation method, perform constant current control such that the lamp maintains constant brightness, perform dimming control for controlling the brightness of the lamp, commonly supply the power provided to the lamp to peripheral circuit modules, and perform constant voltage control such that a driving voltage supplied as power is maintained at a predetermined level or more. | 09-11-2014 |
| 20140265904 | DIMMER CIRCUIT AND LED LIGHTING DEVICE HAVING SAID DIMMER CIRCUIT - A dimmer circuit may include: a rectification module, a control module and an output module, wherein the control module receives an input signal rectified through the rectification module and controls the output module to supply a load with an output signal in accordance with the input signal, and a compensation module which collects sampled signals characterizing dimming state of the dimmer circuit between the control module and the output module, and supplies the control module with a compensation signal in accordance with the sampled signals, the control module changing the value of the output signal according to the input signal and the compensation signal. | 09-18-2014 |
| 20140285103 | SYSTEM AND METHOD FOR CONTROLLING MAXIMUM OUTPUT DRIVE VOLTAGE OF SOLID STATE LILGHTING DEVICE - A programmable driver for driving a solid state lighting device includes a processing circuit, a voltage feedback loop and a power stage. The processing circuit is configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit. The voltage feedback loop is configured to receive the voltage reference signal and to determine a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device. The power stage is configured to limit maximum output voltage for driving the solid state lighting device based at least in part on the determined difference between the reference voltage and the drive voltage of the solid state lighting device provided by the voltage feedback loop. | 09-25-2014 |
| 20140300289 | METHOD AND CIRCUIT FOR DRIVING AN LED LOAD WITH PHASE-CUT DIMMERS - Embodiments of a dimmable driver circuit for a light-emitting diode (LED) load and a method for driving an LED load are described. In one embodiment, a dimmable driver circuit for an LED load includes an alternating current (AC)-direct current (DC) rectifier configured to convert an AC input voltage into a DC voltage, a damper and filter circuit configured to provide a latching current to a phase-cut dimmer and to suppress an inrush current caused by phase-cut dimming, and to filter electromagnetic interference (EMI) noise from the DC voltage, and a switching converter circuit connected to the damper and filter circuit and configured to operate in a boundary conduction mode (BCM) with a constant on-time to generate DC power for the LED load in response to the DC voltage. Other embodiments are also described. | 10-09-2014 |
| 20140306616 | LED DRIVE CIRCUIT - An LED drive circuit applied between an LED load and an AC power supply is provided. The circuit includes a rectifier, a power conversion module, a voltage regulator, a photo coupler and a controller. The rectifier rectifies and converts an AC voltage outputted from the AC power supply into a DC voltage. The power conversion module converts the DC voltage into a first drive voltage and a second drive voltage. The first drive voltage drives the LED load. The voltage regulator receives and processes the second drive voltage with a voltage regulating process to generate a third drive voltage not exceeding a maximum voltage rating of the controller. The photo coupler generates a feedback signal according to a signal outputted from the LED load. The controller receives the third drive voltage and generates a control signal to control the power conversion module according to the feedback signal. | 10-16-2014 |
| 20140354167 | POWER SUPPLY APPARATUS AND DRIVING METHOD THEREOF - A power supply apparatus and a driving method thereof are disclosed | 12-04-2014 |
| 20150069925 | LED LIGHT SOURCE - The invention relates to a LED light source comprising: input terminals (K | 03-12-2015 |
| 20150091466 | TWO-STAGE LED DRIVER WITH SELECTABLE DUAL OUTPUT CURRENT - A two-stage LED driver for providing a substantially constant output current to an LED load, and related methods and systems. The first stage of the LED driver includes a conventional power factor correction (PFC) circuit that outputs a direct current (DC) voltage and a DC current. The second stage of the LED driver 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 LED 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 |
| 20150115824 | LIGHT EMITTING DIODE DRIVER - A light emitting diode driver includes a power supplying unit receiving an alternating current (AC) power and outputting a transformed power according to a predetermined ratio, a rectifying unit rectifying the output power from the power supplying unit, and a double voltage unit receiving the rectified power from the rectifying unit and generating an output voltage such that the level of the output voltage is variable, and has constant duty and frequency thereof even the variance of the voltage level. | 04-30-2015 |
| 20150359054 | CONTROL METHODS AND POWER CONVERTERS SUITABLE FOR TRIAC DIMMING - Control methods and apparatuses providing a holding current for a TRIAC dimmer are disclosed. A control method is suitable for a power controller powered by an operation power source. A high-voltage device in the power controller is connected between the operation power source and an input power source, from which the high-voltage device drains a conduction current. An operation voltage of the operation power source is detected, and, when it is below a first reference, the conduction current is forwarded to charge the operation power source. A detected voltage representing an input voltage of the input power source is provided, and if the detected voltage is below a second reference, the conduction current is forwarded to a ground line instead of charging the operation power source. | 12-10-2015 |
| 20150366018 | DIMMER COMPATIBLE LED DRIVING APPARATUS WITH ADJUSTABLE BLEEDING CURRENT - An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED, a dimming mode detector detecting whether the LED driving apparatus is coupled to a leading edge dimmer or a trailing edge dimmer based on the voltage sensing signal, and a bleeding control circuit generating a control signal to control the bleeding circuit based on the voltage sensing signal, the leading edge dimming mode signal and the trailing edge dimming mode signal. | 12-17-2015 |
| 20150366019 | DIMMING MODE DETECTION METHOD USED IN LED DRIVING APPARATUS - A dimming mode detection method is used in an LED driving apparatus including a rectifier bridge providing a DC bus voltage and a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED. The method involves: powering on the LED driving apparatus; sensing the DC bus voltage and generating a voltage sensing signal; comparing a rising time during which the voltage sensing signal increases from a second threshold voltage to a first threshold voltage with a first time threshold to detect whether the LED driving apparatus is connected to a leading edge dimmer; and comparing a falling time during which the voltage sensing signal decreases from a third threshold voltage to a fourth threshold voltage with a second time threshold to detect whether the LED driving apparatus is connected to a trailing edge dimmer. | 12-17-2015 |
| 20160021711 | CIRCUIT WITH AN LED DIMMING LINEAR COMPENSATION - A circuit with an LED dimming linear compensation, which includes: a rectification circuit with two inputs connected to the alternating current and two DC outputs, a positive DC output and a negative DC output; a filter circuit with inputs connected to the DC outputs and a positive output and a negative output to output positive pole and negative pole; a RCC drive circuit with an oscillating circuit to drive the LED light source by RCC mode; and a compensation resistance R1 series connected in the front stage of one input of the rectification circuit. The compensation resistance R1 is disposed in the front stage of the rectification circuit, when the branch current increases, the voltage of the RCC drive circuit in the followed stage decreases, as the RCC drive circuit is similar to a resistant load, it improves the voltage-current characteristic of the circuit. | 01-21-2016 |
| 20160029450 | 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. | 01-28-2016 |
| 20160150608 | PRIMARY CONTROL LED DRIVER WITH ADDITIONAL POWER OUTPUT AND CONTROL METHOD THEREOF - A primary control LED driver includes: a switching converter having a main switch and a first winding, and configured to provide an LED driving current; a second winding magnetically coupled to the first winding and configured to provide a power supply voltage at a first terminal; a first sensing resistor with a first terminal coupled to the main switch; a second sensing resistor with a first terminal coupled to the second terminals of the first sensing resistor and the second winding; an output current calculator calculating an equivalent value of the LED driving current based on the voltage at the first terminal of the first sensing resistor; an error amplifier configured to generate a compensation signal based on the equivalent value and a reference voltage; and a control circuit generating a control signal to control the main switch based on the compensation signal. | 05-26-2016 |
| 20160255688 | POWER CIRCUIT AND DIMING CONTROL METHOD FOR LED LIGHTING DEVICE | 09-01-2016 |
| 20160381747 | LIGHT EMITTING DIODE DRIVING DEVICE WITH CONTROL BASED ON LED SETTING RESISTANCE - A light emitting diode (LED) driving device with control based on LED setting resistance is disclosed. The LED driving device is applied to an LED lighting fixture having a setting resistor and is configured to modulate output voltage and output current according to the setting resistor to fit the power requirement of the LED lighting fixture. The LED driving device includes a power conversion module and a driving module. The driving module includes a microprocessor and controlling unit. The microprocessor is electrically connected to the LED lighting fixture for sensing the setting resistor and generates a controlling signal in accordance with the sensed setting resistor to the controlling unit. The controlling unit is electrically connected to the microprocessor and the power conversion module and configured to drive the power conversion module to modulate output current and output voltage according to the controlling signal. | 12-29-2016 |
