Class / Patent application number | Description | Number of patent applications / Date published |
315219000 | Periodic switch in the primary circuit of the supply transformer | 86 |
20080224626 | OPTICAL EMISSION SPECTROMETRY DEVICE - An optical emission spectrometry device is provided. In the optical emission spectrometry device, a discharge path is formed by connecting an ignition circuit to a discharge gap, and further connecting in parallel a plurality of sets of coils and driving circuits, each set having one coil and one driving circuit. Each driving circuit has two operation modes: an increasing operation mode of applying a predetermined potential difference to the corresponding coil of the set to increase the current passing through the corresponding coil, and a sustaining operation mode of directly connecting the corresponding coil of the set to the discharge path to sustain the current passing through the corresponding coil. Moreover, each driving circuit is controlled in such a way that the timing for the increasing operation mode in which the current passing through the coil increases alternates with the timing for the increasing operation mode of other driving circuit. | 09-18-2008 |
20080231205 | CURRENT MODE RESONANT INVERTER - The present invention provides a low-cost inverter for ballast. A current transformer is connected in series with a lamp to operate the lamp. A first transistor and a second transistor are coupled to switch the resonant circuit. The current transformer is utilized to generating control signals in response to the switching current of the resonant circuit. The transistor is turned on once the control signal is higher than a first threshold. After that, the transistor is turned off once the control signal is lower than a second threshold. Therefore, a soft switching operation for the first transistor and the second transistor can be achieved. | 09-25-2008 |
20080246409 | Power Supply for Halogen Lamp - A circuit ( | 10-09-2008 |
20080252225 | Dielectric Barrier Discharge Lamp Lighting Device - A dielectric barrier discharge lamp lighting device includes a transformer that supplies a driving voltage to a dielectric barrier discharge lamp from a secondary coil, and a driving circuit that controls an input voltage to the transformer to supply a driving voltage with a driving frequency fd to the dielectric barrier discharge lamp. The self-resonant frequency fr of the secondary coil, which is measured with the primary coil of the transformer being open, is equal to the driving frequency fd or a frequency in the vicinity of the driving frequency fd. This frequency fr satisfies, for example, 0.9fd≦fr≦1.3fd. | 10-16-2008 |
20080272706 | Hybrid Power Supply System - A hybrid power supply system including piezoelectric and ferrite transformers for driving a discharge lamp is provided. Specifically, the hybrid power supply system includes a rectifier/filter, a piezoelectric inverter, and a ferrite converter. The rectifier/filter has an input terminal connected to an external AC voltage to convert the external AC voltage to a DC voltage. The piezoelectric inverter is connected to the rectifier/filter to step up and convert the DC voltage to an AC voltage for driving the discharge lamp. The ferrite transformer is connected to the rectifier/filter to step down the DC voltage to a rated DC voltage for driving discharge lamp circuits other than the discharge lamp. The piezoelectric inverter and the ferrite converter are integrated by connecting a primary side of the piezoelectric step-up transformer and a primary side of the ferrite step-down transformer in series or in parallel with an output terminal of switching circuits. | 11-06-2008 |
20080290809 | CONTROL CIRCUIT OF A DRIVING CIRCUIT OF A DISCHARGE LAMP - A control circuit controls a driving circuit of a discharge lamp. The driving circuit comprises a half bridge and a clock generator that determines the switching frequency of the half bridge. The control circuit comprises a regulator that regulates the value of the switching frequency when the value of the voltage across the lamp exceeds a threshold value. | 11-27-2008 |
20080297060 | Switched LED Nightlight for Single-Gang Junction Box - A nightlight including a light emitting diode (LED) is provided. The nightlight includes a switch that is operative to control the flow of power to the LED. The nightlight also includes a driver circuit that is configured to convert alternating current to direct current, where the direct current provides power to the LED. The nightlight also includes a housing coupled to the nightlight that contains the driver and is configured to fit within a single-gang junction box. The switch includes an LED that is powered by the driver circuit, where the LED is illuminated without regard to the position of the switch. | 12-04-2008 |
20080297061 | HID lighting control with transient voltage sensing and lamp restarting, and method of making and using - A voltage control apparatus ( | 12-04-2008 |
20080303448 | DIELECTRIC BARRIER DISCHARGE LAMP SYSTEM AND DRIVING METHOD THEREOF HAVING RELATIVELY BETTER PERFORMANCE IN STARTUP AND RE-STARTUP OF DIMMING - The configurations of a dielectric barrier discharge lamp (DBDL) system and the driving method thereof are provided in the present invention. The proposed DBDL system includes a driver circuit receiving a DC input voltage and generating an AC output voltage, including a transformer having a primary winding and a secondary winding, a dielectric barrier discharge lamp coupled to the secondary winding and a burst mode dimming circuit including a first switch. In which, the first switch is turned on when the first switch is starting such that the first switch and the primary winding forms a conducting path so as to apply a driving high voltage to the DBDEL and turn off the first switch after the DBDL is breaking through by the driving high voltage such that a driving normal voltage is applied to the DBDL. | 12-11-2008 |
20080309244 | Primary-side driving control circuit for backlight of LCD panel - The present invention discloses a primary-side driving backlight circuit for LCD panel. The primary-side driving backlight circuit employs a single isolation device to achieve isolation request for safety for the secondary side. The PWM controller on the secondary-side of a transformer generates a control signal according to a feedback signal. The control signal is transmitted by the isolation device to a High/Low side driver. The High/Low side driver has a High Output and a Low Output, which drives power switches at high side and low side respectively, in order to control the power of an input source transmitting into the transformer and further control the voltage and current of cold cathode lamp(s) of a backlight circuit. | 12-18-2008 |
20090039796 | POWER SUPPLY FOR AN LCD DISPLAY - A power supply system is provided for a multiple lamp LCD panel. In one aspect, the power supply includes a plurality of transformers for driving a plurality of respective CCFLs. The primary sides of each transformer are coupled in series to thereby reduce the stress on each transformer. For LCD panels that include longer CCFLs, a power supply is provided that includes a plurality of transformers for driving a plurality of respective CCFLs. The primary sides of each transformer are coupled in series and each lamp is coupled to two secondary sides of the transformers, thereby reducing the problems associated with longer CCFL tubes. In any of the embodiments, the power supply can be adapted to convert a high voltage DC signal to high voltage AC used to power the lamps. | 02-12-2009 |
20090045755 | Driving circuit for piezoelectric lamps - An improved driving circuit for piezoelectric lamps includes a power switch unit and at least one piezoelectric transformer. The power switch unit is connected to a power source. ON/OFF of the power switch unit controls power amount transmitted to the piezoelectric transformer. The piezoelectric transformer transforms the power and drives at least one load. Operation of the power switch unit is controlled by a duty cycle signal generated by a pulse modulation unit. The pulse modulation unit is connected to a buffer unit which generates a time series at start time to suppress instant output of the piezoelectric transformer, thereby to improve the problem of voltage surge at the start time happened to the conventional piezoelectric transformers. | 02-19-2009 |
20090128047 | BACKLIGHT ASSEMBLY, DISPLAY APPARATUS HAVING THE SAME AND CONTROL METHOD THEREOF - A backlight assembly with a light source unit, includes: a drive signal generator which generates a switching drive signal on the basis of a predetermined drive frequency and a feedback power fed back from the light source unit; a switching unit which outputs a power to the light source unit in response to the switching drive signal; and a controller which decreases the drive frequency if the feedback power is higher than a predetermined critical value. | 05-21-2009 |
20090160347 | ANTI-STRIATION CIRCUIT FOR CURRENT-FED BALLAST - An electronic ballast circuit having at least two distinct switching cycles also includes an anti-striation feature. More particularly the electronic ballast includes an input section configured to receive an input from a power source. A resonant section receives the signals from the input section in order to generate a resonant signal. An anti-striation component is connected within the electronic ballast circuit to affect operation of the resonant section, which results in an affected resonant signal. A switching arrangement is configured to receive the affected resonant signal from the resonant section and anti-striation component, and is further configured to generate an asymmetric output signal due to the affects of the anti-resonant component, wherein the anti-striation component causes parameters of the resonant section of the electronic ballast circuit to be different for different switching cycles of the electronic ballast circuit. An output section is provided to output the asymmetric output signal to a lamp system. | 06-25-2009 |
20090167199 | FRONT-STAGE VOLTAGE-ADJUSTMENT INVERTER - The present invention discloses a front-stage voltage-adjustment inverter, which comprises: a front-stage voltage-adjustment unit, a duty cycle modulation unit, a half-bridge driving unit and a transformer unit. The front-stage voltage-adjustment unit receives an input power, a dimming signal and a feedback signal. The front-stage voltage-adjustment unit varies the voltage of the input power according to the dimming signal and performs a feedback adjustment according to the feedback signal. In the present invention, the cycle signal generated by the duty cycle modulation unit does not vary with the dimming signal and feedback signal. Thus, the half-bridge driving unit can work in a zero-voltage switching state constantly and drive the transformer unit to output a driving power. Thereby, the present invention can decrease the switching loss and increase the service lives of loads and electronic elements. | 07-02-2009 |
20090278466 | Fluorescent lamp driving circuit - A fluorescent lamp driving circuit is provided. The fluorescent lamp driving circuit collects a pulse-width-modulation and a MOS switch in a single package. The pulse-width-modulation for driving multiple lamps only needs two pins to achieve feedback control and protection control. Thereby the pins required by the pulse-width-modulation are decreased substantially, and the electronic elements needed for feedback and protection control are also reduced, and the overall circuit design is simplified. | 11-12-2009 |
20090315469 | INVERTER FOR DRIVING LIGHT SOURCE - An inverter for driving light source is disclosed. The inverter includes a pulse control unit for producing a conduction period signal, a power switch unit driven by the conduction period signal and a power conversion unit for outputting a driving power, wherein a waveform modulation unit is further connected between the power switch unit and the power conversion unit, and the waveform modulation unit obtains the input power from the power switch unit and converts thereof into a modulation power, wherein the modulation power includes a positive edge modulation period with gradually rising voltage peak and a negative edge modulation period with gradually falling voltage peak, with the positive edge modulation period has a duration longer than that of the negative edge modulation period, and the modulation power is transmitted to the power conversion unit for being further converted into the driving power. | 12-24-2009 |
20100013398 | High Voltage Discharge Lamp Lighting Device - A high-voltage discharge lamp lighting device provides a starting pulse voltage sufficient to turn on a high-voltage discharge lamp having terminal wire connections of variable length. A power conversion circuit is coupled to a commercial AC power source input and rectifies the AC input into a predetermined DC voltage output. A charging capacitor is coupled to the power conversion circuit. A full bridge circuit is coupled to the power conversion circuit and the charging capacitor and provides a rectangular wave AC output signal to a transformer primary winding circuit of at least a capacitor, a single switching element and a primary winding of a transformer. A low pulse voltage is induced in the primary winding and a transformer secondary winding is connected on one end to the high-voltage discharge lamp, wherein the low pulse voltage is stepped up to a high pulse voltage and applied to the high-voltage discharge lamp. A reference voltage is generated in a reference transformer winding representative of the high pulse voltage. A starting pulse equivalent value detection circuit is connected to the reference winding and detects a value associated with the reference voltage. A control circuit receives said value from said detection circuit, and variably controls at least one of a frequency of the single switching element or an ON impedance of the single switching element in association with said value, wherein said frequency or ON impedance is further associated with a starting pulse voltage sufficient to start the high-voltage discharge lamp. | 01-21-2010 |
20100045195 | CONSTANT CURRENT SWITCHING POWER SUPPLY APPARATUS, METHOD OF DRIVING IT, LIGHT SOURCE DRIVING APPARATUS, METHOD OF DRIVING IT, AND IMAGE DISPLAY APPARATUS - In a constant current switching power supply, the current flowing through the load, is feedback-controlled based on the deviation of the detection value (Id) from the target value (Ir), multiplied by a proportional gain (PG), the value of the gain is set to a predetermined value immediately after the load switching element ( | 02-25-2010 |
20100060179 | 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. | 03-11-2010 |
20100102738 | CIRCUIT ARRANGEMENT FOR OPERATING A VACUUM GAS DISCHARGE LAMP - A circuit arrangement for operating a low-pressure gas discharge lamp with a first and a second filament, between which a gas discharge can be formed, is provided. The circuit arrangement may include a device for generating an electrical potential which varies over time at a node, which is connected to the first filament via a first inductive element, and a half-circuit, which includes a switch, the first filament being electrically connected to the second filament when the switch of the half-circuit is closed, wherein a second inductive element is provided in the half-circuit. | 04-29-2010 |
20100171433 | LUMINESCENT LAMP LIGHTING DEVICE - A luminescent lamp lighting device includes a plurality of switch circuits | 07-08-2010 |
20100176737 | DISCHARGE LAMP BALLAST HAVING AN AUTO-TRANSFORMER FOR HIGH VOLTAGE DETECTION - A lamp ballast is provided requiring less size and cost for powering a discharge lamp. An inverter circuit converts a DC voltage from a DC power source into a voltage having a determined frequency, and supplies the converted voltage to the discharge lamp inserted between a pair of output ends of the inverter. A resonant circuit includes an auto-transformer and a resonant capacitor, and supplies an output voltage corresponding to a frequency of the rectangular wave voltage of the power supply circuit to the discharge lamp. A voltage detection circuit detects an output voltage of the resonant circuit based on a potential of the resonant capacitor. A control circuit has a startup control mode to set the frequency of the rectangular wave voltage based on the detected voltage from the voltage detection circuit, wherein the output voltage of the resonant circuit exceeds a starting voltage of the discharge lamp. | 07-15-2010 |
20100237792 | DISCHARGE TUBE POWER SUPPLY APPARATUS AND SEMICONDUCTOR INTEGRATED CIRCUIT - An AC conversion circuit includes a main transformer having a primary winding and a secondary winding to electrically insulate the AC power source side and the discharge tube side from each other, an IC | 09-23-2010 |
20100270936 | DIMMABLE LIGHT GENERATING DEVICE - A wake-up lighting device is described, comprising a gas discharge lamp ( | 10-28-2010 |
20100283399 | Symmetrical RF Power Supply for Inductively Coupled Electrodeless Lamps - A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected between the rails, a first inductor arranged to inductively couple with an electrodeless lamp, first and second resonance capacitors that each connects a respective one of two input terminals of the first inductor to a same first rail of the pair of DC rails, and a second (ballasting) inductor connecting an output of the RF inverter to one of the two input terminals of the first inductor. Thus, the first inductor is connected in a symmetrical π-filter and supplied by two equal but phase-opposite voltages whose sum is the lamp voltage. The inductance of the ballasting inductor is significantly reduced so that the RF efficiency of the power supply is 96%. | 11-11-2010 |
20100301763 | LAMP DRIVING DEVICE WITH OPEN VOLTAGE CONTROL - A lamp driving device with an open voltage control comprises a DC power source, a square wave switch, a square wave controller, an LC resonant circuit, a driver transformer and a current detector; wherein the square wave switch outputs a square wave signal to the LC resonant circuit, the LC resonant circuit converts the square wave signal into a sinusoidal wave signal and outputs the sinusoidal wave signal to the driver transformer, and finally the driver transformer drives the lamp and the current detector is used to detect the operation of the lamp, and, if the lamp is found open-circuit, a PWM control pin will control the square wave controller to stop the operation of the lamp driving device, thereby enhancing safety in using the lamp. | 12-02-2010 |
20100308740 | ELECTRONIC BALLAST AND METHOD FOR OPERATING AT LEAST ONE DISCHARGE LAMP - An electronic ballast for operating at least one discharge lamp may include an input for coupling to an input voltage; a load circuit with an output, the load circuit having a bridge circuit; an intermediate circuit capacitor that is coupled to the input of the load circuit; a transformer that is coupled between the input of the ballast and the capacitor, the transformer having a transformer switch; a control apparatus for driving the switch; and a monitoring apparatus for monitoring at least one value correlated with the input voltage, the control apparatus being designed to deactivate the driving of the switch upon detection of a deactivation criterion; and a voltage measuring apparatus for measuring the intermediate circuit voltage, the control apparatus being designed to reactivate the driving of the switch after a deactivation phase when the sum of input and intermediate circuit voltage has dropped below a prescribable threshold value. | 12-09-2010 |
20100327761 | INTEGRATED BACKLIGHT CONTROL SYSTEM - A lighting arrangement constituted of: a power factor correction circuit; a lighting controller operative at an electrical potential consonant with the electric potential of the output of the power factor correction circuit; a switching network, coupled to the output of the power factor correction circuit and to respective outputs of the lighting controller; a transformer, a primary winding of the transformer coupled to the output of the switching network; and at least one luminaire coupled to at least one secondary winding of the transformer and arranged to be driven by the at least one secondary winding, the lighting controller operative to control the switching network via the respective outputs to switchably pass current from the power factor correction circuit through the primary winding, thereby powering the at least one luminaire. | 12-30-2010 |
20110025217 | INRUSH CURRENT LIMITER FOR AN LED DRIVER - An inrush current limiter for use with an LED driver including a current limiting device, a bypass switch device, and a switch drive. The current limiting device is placed in the input current path of the LED driver to limit input current to a predetermined maximum level in response to an AC conductive angle modulated voltage. The bypass switch device is coupled in parallel with the current limit device. The switch drive turns on the bypass switch device to at least partially bypass the current limiting device as a voltage level of an input of a switching converter rises. The input current remains sufficiently high without exceeding the maximum level. The switch drive is implemented with a delay network driven either by a separate transformer winding or by a snubber network. The delay network may have a delay based on the delay caused by the current limiting device. | 02-03-2011 |
20110037399 | DIMMER CIRCUIT OF LIGHT EMITTING DIODE AND ISOLATED VOLTAGE GENERATOR AND DIMMER METHOD THEREOF - An isolated configuration dimmer circuit of a light emitting diode (LED) applied to a conventional triac dimmer and a dimmer method are provided. When a dimmer phase angle of the triac dimmer is regulated, a second side winding of a transformer of the isolated configuration produces a pulse width corresponding to a modulated alternating current (AC) voltage, so as to regulate the pulse width of a driving signal output by the second side winding of the transformer. In addition, the dimmer circuit regulates the magnitude of a current flowing through the light emitting diode (LED) according to the pulse width corresponding to the modulated AC voltage. Accordingly, the dimmer circuit regulates the pulse width and the magnitude of the current flowing through the LED according to the dimmer phase angle of the triac dimmer. Therefore, a dimmer range of the LED can be increased. | 02-17-2011 |
20110062876 | OFFLINE LED DRIVING CIRCUITS - An offline LED driving circuit includes a controller, a shunt regulator, an opto-coupler, and a dimming circuit. The controller generates a switching signal to switch a transformer for providing an output voltage and an output current. The shunt regulator is coupled to an output terminal of the LED driving circuit for providing a feedback signal to the controller via the opto-coupler. The dimming circuit coupled to the shunt regulator modulates the feedback signal at a first feedback level and a second feedback level in response to a dimming signal. The output voltage is respectively regulated at a first output level and a second output level in response to the first feedback level and the second feedback level of the feedback signal. The duty cycle of the switching signal will be varied in a soft-start manner when the feedback signal changes from the second feedback level to the first feedback level. | 03-17-2011 |
20110062877 | OFFLINE LED LIGHTING CIRCUIT WITH DIMMING CONTROL - An offline LED lighting circuit comprises a controller and a dimming circuit. The controller generates a switching signal to switch a transformer for generating an output voltage and an output current at an output terminal of the offline LED lighting circuit to drive LEDs. The dimming circuit is coupled to the controller to modulate the switching signal in response to a dimming signal. A first reference voltage and a second reference voltage of the controller are generated in response to the dimming signal. The switching signal is modulated by the first reference voltage and the second reference voltage. The controller regulates the output voltage at a first output level and a second output level in response to both the first reference voltage and the second reference voltage. The second output level is lower than the first output level. | 03-17-2011 |
20110080103 | METHOD AND APPARATUS FOR POWER DRIVING - Aspects of the disclosure provide a power circuit to provide electric energy with control and protection for driving a load, such as a light emitting diode (LED) array, and the like. The power circuit includes a converter, a voltage feedback module, a current feedback module and a controller. The converter is configured to receive electric energy from an energy source and to deliver the electric energy for driving the load. The voltage feedback module is configured to generate a first feedback signal based on a voltage of the delivered electric energy. The current feedback module is configured to generate a second feedback signal based on a current of the delivered electric energy. The controller is configured to receive the first feedback signal and the second feedback signal, and to control the converter to receive and deliver the electric energy based on the first feedback signal and the second feedback signal. | 04-07-2011 |
20110169416 | DISCONTINUOUS CURRENT REGULATOR CIRCUIT FOR DRIVING LIGHT-EMITTING DIODES - A discontinuous current regulator circuit is composed of a switched-mode power converter circuit, a sensing circuit and a current mode controller circuit. The current mode controller circuit, based on the signal from the sensing circuit, controls the switched-mode power converter circuit to supply a regulated discontinuous current to a light-emitting diode or light-emitting diode arrangement comprising a plurality of light-emitting diodes. The present invention provides a discontinuous current regulator circuit for driving white light-emitting diodes able to provide higher perceived brightness levels and with longer lifetime than existing light-emitting diode drivers. | 07-14-2011 |
20110199012 | Driving Circuit For Lighting Lamp And Cold Cathode Fluorescent Lamp Using Driving Circuit Thereof - A driving circuit for lighting lamp is provided, including, in the order of, a bridge rectifier, an EMC filter, a control circuit, a power transformer and a cold cathode fluorescent load, with a feedback loop connected in series between the control circuit and the power transformer. A cold cathode fluorescent lamp using the driving circuit for lighting lamp is also provided, including a plastic lamp tube, a cold cathode fluorescent lamp tube, installation electrodes, frame and driving circuit module. Two contact electrodes are connected to the electrodes of the installation electrodes on the two ends of the plastic lamp tube for electrical connection to the conventional fluorescent lamp base. The circuit of the present invention is simple in structure, uses less number of components, is inexpensive in manufacturing, novel control mechanism and high reliable. The present invention is suitable for inserting cold cathode fluorescent lamp to the conventional fluorescent lamp base, regardless of the presence of a starter, for luminance. | 08-18-2011 |
20110309762 | CONVERTER FOR SUPPLYING PULSED POWER TO LIGHT SOURCE - Converters ( | 12-22-2011 |
20120013263 | Electronic Operating Device for Gas Discharge Lamps with Reduced Power Loss and Method for Operating the Operating Device - An electronic operating device for a gas discharge lamp having a voltage transformer which converts an input voltage into an intermediate circuit voltage, and an inverter with a lamp inductor and a bridge circuit with at least two switches which converts the intermediate circuit voltage into a lamp voltage, the operating device being designed to adjust the intermediate circuit voltage present between the DC voltage transformer and the inverter to a predetermined value which is dependent on the lamp state. Also disclosed is a method for operating an operating device. | 01-19-2012 |
20120032605 | SYSTEM AND METHOD FOR DIMMABLE CONSTANT POWER LIGHT DRIVER - An apparatus is disclosed that is capable of delivering substantially constant power to a luminous load with variation in the input voltage and the environment temperature. The apparatus may be further adapted to vary the power supplied to the luminous load based on changes in the input voltage produced by a phase control dimmer or external device. Additionally, if the input voltage is changed due to a user controlling a dimmer device to control the brightness of the luminous load, the apparatus is able to control the power delivered to the load in response to the dimmer device. Additionally, the apparatus is adapted to allow the luminous output light intensity to be controlled by changes in a remote control voltage source or variable resister and draws near unity power factor power from the AC input throughout the dimming range when not used with phase control dimmer. The remote control or variable resistor can operate simultaneously with a dimmer to achieve multiple controls for the light output. | 02-09-2012 |
20120146530 | LIGHT EMITTING DIODE DRIVER - The present, invention relates to a light emitting diode driver that integrates a light emitting diode control function and a power switching control function at a secondary side insulated from a primary side in a power supply circuit, without using a photo coupler to control power switching at the primary side. | 06-14-2012 |
20120153856 | DRIVING DEVICE OF LIGHT EMITTING DIODE AND LIGHTING APPARATUS USING THE SAME - A driving device of a Light Emitting Diode (LED) and a lighting apparatus using the same are provided. The driving device of the LED is adapted for receiving an Alternating Current (AC) power source adjusted by a dimmer and a transformer unit, and includes a dimming driving unit and a voltage multiplier unit. The dimming driving unit receives a driving Direct Current (DC) power source produced by the voltage multiplier unit, so as to drive and adjust the brightness of a light source of an LED unit. The voltage multiplier unit multiplies the AC power source according to a power specification of the dimming driving unit, so as to transform and supply the driving DC power source to the dimming driving unit, and thus flicker on the light source of the LED unit can be avoided during dimming. | 06-21-2012 |
20120200232 | ELECTRONIC BALLAST WITH DIMMING CIRCUIT - An electronic ballast with dimming circuit including an electronic ballast dimming circuit receiving an analog dimming signal, the electronic ballast dimming circuit including an input dimming circuit ( | 08-09-2012 |
20120212147 | Flyback Energy Converter - The present invention is to provide a flyback energy converter comprising a transformer having a primary winding, a secondary winding and an auxiliary winding, a load electrically connected with the secondary winding, a switch serially connected with the primary winding and a primary controlling circuit. The primary controlling circuit comprises a voltage measurement terminal and a switch controlling terminal. The voltage measurement terminal measures an output voltage wave provided from the auxiliary winding to get a part of times in the part of the output voltage wave, so as to enlarge the part of times to a total time. According to a predetermined timing transferred from the total time, the switch controlling terminal controls the switch. | 08-23-2012 |
20120293087 | LIGHTING DRIVER CIRCUIT AND LIGHT FIXTURE - A lighting fixture that suppresses blinking and flickering phenomena even when operating at very low luminance levels includes: a light source including at least one solid state light-emitting element; and a lighting driver circuit controlling the light source in accordance with a control signal. The lighting driver circuit includes an isolating flyback circuit and a control circuit. The isolating flyback circuit switches power from a DC power source and smooths the output. The control circuit controls switching operation performed by a switching element of the isolating flyback circuit via PWM signal. The control circuit provides a frequency component in accordance with the control signal to a reference signal outputted by a reference signal generator. In accordance with results of detection of the reference signal and a current flowing through the light source, the control circuit provides a stop period during which a driver controller driving the switching element is stopped. | 11-22-2012 |
20130119884 | LIGHT SOURCE MODULE - The present invention provides a light source module, including at least a LED and a switching power supply. The switching power supply has an input port, an output port, a transforming unit, and a switching unit. An external power source is connected to the input port, the LED is electrically connected to the output port, and the transforming unit is between the input port and the output port to receive power of the external power source through the input port, transform the power, and send the power to the light emitting diode through the output port. The switching unit includes a ringing choke converter electrically connected to the transforming unit to make the transforming unit provide a constant current to the LED by turning on and turning off the power outputting from the transforming unit. | 05-16-2013 |
20130169182 | PWM CONTROL CIRCUIT, FLYBACK CONVERTER AND METHOD FOR CONTROLLING PWM - Disclosed herein are a PWM control circuit, a flyback converter, and a PWM control method. The PWM control circuit includes: a peak storing and reference signal generating unit storing a peak value of one period of a feedback signal from a secondary side output and inverting the peak signal arid outputting the inverted peak signal as a reference signal; and a PWM control signal generating unit generating a PWM control signal by using an output obtained by comparing the reference signal with a reference waveform from the peak storing and reference signal generating unit. In addition, the flyback converter including the same and the method for controlling PWM are proposed. | 07-04-2013 |
20130300307 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A controller for controlling a power converter includes a signal generator and a driver. The power converter receives an input voltage and provides an output voltage to power a load. The signal generator receives a sense signal indicating a current flowing through the power converter, receives a detection signal indicating whether the power converter operates in a predetermined state, and generates a square wave signal according to the sense signal and the detection signal. The square wave signal has a first voltage level proportional to a peak level of the current when the power converter operates in the predetermined state; otherwise, the square wave signal has a second voltage level. The driver generates a driving signal based on the square wave signal to control a current flowing through the load. | 11-14-2013 |
20130307434 | METHOD AND APPARATUS FOR CONTROLLING A LIGHTING DEVICE - Aspects of the disclosure provide a method. The method includes detecting a dimming characteristic in an energy source that provides energy to be transferred to a load via a magnetic component, receiving a dimming control signal, and controlling a switch in connection with the magnetic component based on the dimming characteristic and the dimming control signal to transfer energy to the load via the magnetic component. | 11-21-2013 |
20140009078 | SYSTEMS AND METHODS FOR LOW-POWER LAMP COMPATIBILITY WITH A TRAILING-EDGE DIMMER AND AN ELECTRONIC TRANSFORMER - In accordance with these and other embodiments of the present disclosure, a system and method for providing compatibility between a load and a secondary winding of an electronic transformer driven by a trailing-edge dimmer may include predicting based on an electronic transformer secondary signal an estimated occurrence of a high-resistance state of the trailing-edge dimmer, wherein the high-resistance state occurs when the trailing-edge dimmer begins phase-cutting an alternating current voltage signal and operating the load in a high-current mode for a period of time immediately prior to the estimated occurrence of the high-resistance state. | 01-09-2014 |
20140009079 | SYSTEMS AND METHODS FOR LOW-POWER LAMP COMPATIBILITY WITH A LEADING-EDGE DIMMER AND A MAGNETIC TRANSFORMER - A system and method for providing compatibility between a load and a secondary winding of a magnetic transformer driven at its primary winding by a trailing-edge dimmer may include determining from a magnetic transformer secondary signal a period of a half-line cycle of an output signal of the dimmer, determining from the magnetic transformer secondary signal an estimated occurrence of an end of a phase-cut angle of the dimmer, and generating a driving signal to the load based on the period and the estimated occurrence of the end of the phase-cut angle. A lamp assembly may include a lamp for generating light and a controller for controlling operation of the lamp, the controller comprising a timing control circuit for determining a period of a periodic signal received by the lamp assembly. | 01-09-2014 |
20140125244 | SYSTEM AND METHOD FOR PROGRAMMING A CONFIGURABLE LOAD CONTROL DEVICE - A system for configuring at least one output parameter of a lighting load power supply, the lighting load power supply having a programmable controller for regulating the output parameter to a target value and having a memory for storing a variable for setting the target value of the output parameter, the power supply having a communication port for receiving data for setting the target value, the system comprising a computer executing software allowing a user to select a target value of an output parameter of the lighting load power supply and having a first port providing data related to the selected output parameter; and a programming device having a second port in communication with the first port of said computer and for providing data relating to said selected output parameter in a form usable by said lighting load power supply to said communication port of said lighting load power supply for programming said programmable controller to set the output parameter to the selected target value. | 05-08-2014 |
20140239837 | ION GENERATION DEVICE AND ELECTRICAL APPARATUS - An ion generation device includes: a high voltage generation circuit; and an ion generation element. The high voltage generation circuit includes: a capacitor; a high voltage transformer; a switching element; and a pulse signal generation portion which generates a pulse signal for controlling the turning on and off of the switching element. The pulse signal generation portion adjusts a pulse width of an on-period such that the pulse width of the on-period of the pulse signal is substantially equal to a time obtained by multiplying the reciprocal of an output voltage frequency at the time of a forward operation of the high voltage transformer by one-fourth. | 08-28-2014 |
20140252976 | IGNITION DEVICE WITH IGNITION COIL - An ignition device includes an ignition coil with a primary coil and a secondary coil, a spark plug with center and ground electrodes for discharge therebeteween, and a voltage limiting circuit. The voltage limiting circuit limits voltage applied between the electrodes of the spark plug such that the voltage has an absolute value limited within a predetermined voltage limiting value. The voltage limiting value is differentiated from each other in first and second stages. The first stage is defined as a period in which an initial discharge peak ends, the initial discharge peak being initially generated by electric energy. The second stage is defined as a period after the end of the initial discharge peak. The voltage limiting value in the first stage is lower than the voltage limiting value in the second stage. | 09-11-2014 |
20150015158 | APPARATUSES FOR BLEEDING CURRENT FROM A TRANSFORMER OF A SOLID-STATE LIGHT EMITTING DIODE - A system configured to provide current to power a solid-state light emitting diode in accordance with a dimming level, wherein the dimming level corresponds to an amount of light provided from the solid-state light emitting diode. The system includes a transformer and a switch. The transformer includes a coil. The transformer is configured to receive a first current. The coil is configured to, based on the first current, output a second current to power the solid-state light emitting diode. The switch is configured to, based on a dimming level that corresponds to the amount of light provided from the solid-state light emitting diode of the system, bleed a portion of the second current out of the coil to a ground reference in order to divert the portion of the second current from being supplied to the solid-state light emitting diode. | 01-15-2015 |
20150334797 | OPERATION OF AN ILLUMINANT BY MEANS OF A RESONANT CONVERTER - The invention relates to an operating device for loads in the form of lighting means, particularly for LEDs, comprising: a clocked converter (B) having a switching element ( | 11-19-2015 |
20150351184 | SELF-EXCITED TRIAC DIMMING CIRCUIT - A self-excited TRIAC dimming circuit applied in a panel light includes a dimming module and at least one conversion module, and a power factor controller (PFC) is installed in the dimming module, and the conversion module is a self-excited electronic isolation transformer, and the TRIAC PFC is integrated with the circuit structure of a self-excited electronic transformer to improve the overall circuit stability, so that the panel light complies with a high safety standard to enhance product applicability and competitiveness. | 12-03-2015 |
20160007417 | Multi-Function Terminal - Embodiments described herein describe a power supply controller configured to control a power supply that provides power to an output load via a power supply transformer. The power supply controller includes a first terminal that provides supply voltage to the controller. The controller also includes a second terminal coupled to a switch external to the controller, the switch is part of a power converter controlled by the controller, wherein the second terminal is used for an initial power up of the power converter when the switch is turned on and used for a second functionality when the switch is turned off. | 01-07-2016 |
20160160832 | Ignition System for Spark Ignition Engines and Method of Operating Same - An ignition coil system is configured for use with a spark ignition internal combustion engine. The system includes a first switching circuit electrically connected to the primary coil that provides electrical power to the primary coil. The system includes a second switching circuit connected to the primary coil that is configured to short the terminals of the primary coil after the secondary current has been induced in the secondary coil, whereby the secondary coil induces a current in the primary coil, thereby reducing the secondary current in the secondary wire coil. A controller in communication with the first and second switching circuits is configured to receive a single electronic spark timing (EST) signal and to control the conductive states and the non-conductive states of the first and second switching circuits based on this single EST signal. | 06-09-2016 |
315220000 | Plural transformers in the supply circuit | 5 |
20080252226 | LIGHT SOURCE DRIVING DEVICE - A light source driving device includes a power stage circuit, a first transformer circuit, a second transformer circuit, and a feedback control circuit. The power stage circuit converts a received signal to an alternating current (AC) signal, which includes a synchronizing switching bridge arm, a first bridge arm, and a second bridge arm. The synchronizing switching bridge arm has a Soft-Switching function, and forms a first full-bridge circuit with the first bridge arm and forms a second full-bridge circuit with the second bridge arm. The first transformer circuit is connected to the first full-bridge circuit, for converting the AC signal. The second transformer circuit is connected to the second full-bridge circuit, for converting the AC signal. The feedback control circuit is connected between the light source module and the power stage circuit, for controlling output of the power stage circuit. | 10-16-2008 |
20090184651 | Circuit system for driving high-intensity discharging lamp - The invention provides a circuit system for driving a high-intensity discharging lamp, comprising a boosting circuit, an ignition coil circuit and a clamp circuit. The boosting circuit includes a first transformer and a first switch, in which the primary of the first transformer receives an input power, the secondary of the first transformer produces a boosting DC voltage, and the first switch is connected to the first transformer to control turning-on and turning-off of the first transformer. The ignition coil circuit is connected to the boosting circuit for converting the boosting DC voltage into a switching AC voltage to drive a load. The clamp circuit is connected to the boosting circuit and the ignition coil circuit for directing energy, reflected from the secondary of the first transformer to the primary of the first transformer, to the secondary of the first transformer as the first switch is turned off. | 07-23-2009 |
20100283400 | Method for Controlling a Series Circuit Current of a Lighting Installation at an Airfield or the Like, and a Constant-Current Regulator - Disclosed is a method for controlling a series circuit current of a lighting installation at an airfield or the like, in which case the series circuit current which flows through transformers which are arranged on the secondary side of an output transformer and are connected in series, in order to supply lighting appliances is controlled by means of a thyristor module, which is arranged on the primary side of the output transformer and has a variable trigger angle, in which case, when a control unit is in a constant-current mode, the trigger angle is set in such a manner that a series circuit current which corresponds essentially to a rated output current flows. The invention also relates to a constant-current regulator for carrying out the method. | 11-11-2010 |
20120242244 | INVERTER DEVICE AND ILLUMINATION DEVICE FOR USE IN DISPLAY DEVICE INCORPORATING SAME AND DISPLAY DEVICE - In an inverter device which includes a plurality of transformers, in which output voltages of the transformers are used as input voltages that are input to a plurality of discharge tube lamps and which is used to drive the discharge tube lamps, at least one of drive frequencies of the transformers is different from the other drive frequencies. | 09-27-2012 |
20130241429 | METHOD FOR ACTUATING A SPARK GAP - A method for actuating a spark plug, in which the spark plug is assigned a first ignition coil and second ignition coil. Triggered by a start signal, the primary winding of the first ignition coil is charged, and the primary winding of the second ignition coil is charged with a delay D, for which 0≦D, by supplying a direct current, wherein, whilst each primary winding, is charged, the respective secondary winding is blocked; the primary current supplied to the primary windings is measured; after a period T, the primary winding of the first ignition coil is discharged, and with the delay D the primary winding of the second ignition coil is discharged; the secondary current flowing through the spark plug is measured; thereafter the primary windings of the first and second ignition coil start to be charged alternately when the secondary current falls below a threshold; the primary windings are discharged alternately when the primary current reaches an upper threshold; the above steps are repeated until the duration of discharge between two electrodes of the spark plug | 09-19-2013 |
315221000 | Secondary conductively connected to the primary | 2 |
20120025728 | HID LAMP IGNITOR - An HID lamp ignitor for a lamp including a transformer ( | 02-02-2012 |
20150061530 | LIGHT SOURCE DRIVING APPARATUS HAVING A SNUBBER TO PREVENT VOLTAGE AND CURRENT SPIKES, DISPLAY APPARATUS AND DRIVING METHOD THEREOF - A light source driving apparatus, a display apparatus and a driving method thereof are disclosed. The light source driving apparatus includes a tapped-inductor boost converter (TIBC) circuit, the TIBC circuit including: a switching unit configured to be turned on and off in accordance with a preset cycle; a tapped inductor configured to transfer a current from a primary side to a secondary side as the switching unit is turned on; and a snubber configured to include a clamp capacitor and clamp diode configured to clamp a voltage of the switching unit, a resonance capacitor configured to perform a resonance as being charged and discharged corresponding to a switching cycle of the switching unit, and first and second resonance diodes configured to charge and discharge the resonance capacitor. Thus, the TIBC circuit provided with the lossless snubber can prevent the voltage stress from increasing during the resonance since the voltage of the switching unit is clamped. | 03-05-2015 |
315222000 | Plural interrupted transformer coil circuits | 1 |
20080284344 | POWER SUPPLY UNIT FOR GAS DISCHARGE PROCESSES - A method of generating an output DC voltage of a gas discharge process voltage supply unit, in which in a first voltage transformation stage a first DC voltage is transformed into a second DC voltage of a predetermined voltage range, and the output DC voltage is generated from the second DC voltage in a second voltage transformation stage. A switching element of at least one boost converter is switched with a controlled pulse-duty factor for generating the output DC voltage in the second voltage transformation stage. This method permits striking and maintenance of a plasma process. | 11-20-2008 |
315223000 | Condenser or inductance in the primary circuit | 20 |
20090009098 | Discharge Lamp Ballast Apparatus - A capacitor | 01-08-2009 |
20100289419 | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-PRESSURE GAS DISCHARGE LAMP AND CORRESPONDING METHOD - A circuit arrangement is provided, which may include an input; an output; an inverter, configured to provide an AC supply voltage from a DC supply voltage; a control device configured to drive the inverter, the control device being configured to initiate a preheating phase once a preheating criterion has been met; a resonant circuit having a resonant inductor and having a resonant capacitor; and a transformer configured to preheat electrodes of a gas discharge lamp; wherein the primary winding of the transformer is connected in series with the resonant capacitor and is connected directly to the reference potential of the control device, and an electrical switch is coupled in parallel with the primary winding of the transformer, which switch has a control connection, which is coupled to the control device being configured to transfer the electrical switch into its electrically conducting switching state once the starting criterion has been met. | 11-18-2010 |
20120043902 | LED DRIVER CIRCUIT AND LED LIGHTING DEVICE USING THE SAME - Provided is an LED driver circuit, to be connected to an AC power supply via a phase-control dimmer, for driving an LED load, including: a switching power supply part including a switching element and a switching current detection part; an LED current detection part; a first control part for controlling and switching the switching element so that a switching current has a desired current value based on a detection signal of the switching current detection part; a second control part for controlling and switching the switching element so that an LED current has a desired current value based on a detection signal of the LED current detection part; and a switch part for switching between control performed by the first control part when the phase-control dimmer is set to high brightness dimming and control performed by the second control part when the phase-control dimmer is set to low brightness dimming. | 02-23-2012 |
20120056549 | DISCHARGE LAMP LIGHTING CIRCUIT - A discharge lamp lighting circuit includes a DC/DC converter which generates from an input voltage a drive voltage to be applied to a discharge lamp of a driven object. A first drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is an output capacitor on an output side of the DC/DC converter. A second drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is the output capacitor. The second drive voltage generating path is different from the first drive voltage generating path. A control circuit controls ON/OFF of the first drive voltage generating path. The discharge lamp lighting circuit is arranged so that the voltage of the output capacitor when the first drive voltage generating path is in an ON-state becomes higher than the voltage of the output capacitor when the first drive voltage generating path is not so. | 03-08-2012 |
20120098452 | METHOD OF CONTROLLING IGNITION CIRCUIT AND IGNITION CIRCUIT USING THE SAME - A method of controlling an ignition circuit to output an excitation voltage is disclosed. The ignition circuit is used to excite a discharge lamp and includes a transformer and a switch element which is connected to a primary winding of the transformer. The method of controlling the ignition circuit comprises steps of: (a) receiving a control signal which is set in accordance with a waveform characteristic of a predetermined excitation voltage to control an impedance of the switch element; (b) controlling a primary current in the primary winding or a primary voltage across the primary winding of the transformer by controlling the impedance of the switch element; and (c) generating the excitation voltage by the secondary winding of the transformer in accordance with the primary current or the primary voltage so as to excite the discharge lamp. | 04-26-2012 |
20120169245 | CONTROLLING CIRCUIT FOR AN LED DRIVER AND CONTROLLING METHOD THEREOF - The present invention relates to a controlling circuit and controlling method for an LED driver implemented as a flyback topology. The controlling circuit may be at a primary side of a transformer of the LED driver, and include a sampling circuit, an on time sensing circuit of an output diode, a regulating signal generator, and a PWM controller. The sampling circuit may generate a sampling signal indicating output current by sampling at the primary transformer side. The on time sensing circuit can detect an on time of the output diode. The regulating signal generator can generate a regulating signal by regulating the sampling signal, a voltage reference, and the on time of the output diode. The PWM controller may generate a controlling signal to control operation of a switching device of the LED driver to maintain a substantially constant output current in accordance with the regulating signal. | 07-05-2012 |
20120262081 | DRIVING CIRCUIT STRUCTURE - The invention discloses a driving circuit structure for driving light-emitting loads. The driving circuit structure may include a power supplying device, a signal processing device and an impedance balancing device and a dimming control unit. The power supplying device is used for supplying an alternating current power supply. The signal processing device is used for converting the alternating current power supply into a direct current power supply, so as to drive the light-emitting loads. The impedance balancing device is used for balancing an alternating current magnitude of the alternating current power supply, so as to stabilize a direct current magnitude of the direct current power supply for driving the light-emitting loads. The dimming control unit is capable of controlling output luminance of the light-emitting loads. | 10-18-2012 |
20130063039 | ISOLATED FLYBACK CONVERTER FOR LIGHT EMITTING DIODE DRIVER - An isolated flyback converter for an LED driver may include: (1) A snubber circuit configured to be connected to the primary side of a transformer. (2) A switching unit configured to have a source terminal and a drain terminal and configured to be turned on or off. (3) A control unit configured to detect a first input signal proportional to a fluctuation in the power supply voltage, detect a second input signal when the switching unit is turned off, generate a signal inversely proportional to the maximum value of the first input signal and multiply the generated signal to the second input signal, and control a peak current of the switching unit to be proportional to the multiplication result of the signal inversely proportional to the maximum value of the first input signal and the second input signal such that a secondary-side current of the transformer is maintained constant. | 03-14-2013 |
20130181629 | DISCHARGE DEVICE - A pulse controller performs a control to apply at least one high-energy first pulse P | 07-18-2013 |
20130342125 | DIMMING ANGLE SENSING CIRCUIT, DIMMING ANGLE SENSING METHOD, AND POWER SUPPLY DEVICE COMPRISING THE DIMMING ANGLE SENSING CIRCUIT - A dimming angle sense circuit according to an exemplary embodiment of the present invention generates a source current that depends on an auxiliary voltage corresponding to an input voltage during a turn-on period of a power switch for a period during which an input is generated according to a dimming angle. The dimming angle sense circuit generates a dimming sense voltage by mirroring the source current, and generates a sampling voltage by sampling a dimming sense voltage for every turn-on period of a power switch. The dimming angle sense circuit generates a dimming signal by supplying a dimming current to a dimming resistor and a dimming capacitor according to a result of comparison between the sampling voltage and a reference voltage. | 12-26-2013 |
20140117869 | DISPLAY DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM - A display device with wireless power supply from power transmission means is disclosed in the disclosure. The display device comprises a display module, a system controlling module and a wireless power receiving module. The system controlling module is electrically connected to the display module. The wireless power receiving module is electrically connected to the system controlling module. The wireless power receiving module comprises a plurality of near-field coil units. The near-field coil units have individual receiving frequencies and individual output powers. The near-field coil units are configured to resonate with a transmission coil of the power transmission means. According to a transmission frequency on the transmission coil, the near-field coil unit with corresponding receiving frequency generates an electricity supply with a certain output power to the system controlling module. In addition, a wireless power transmission system is also disclosed herein. | 05-01-2014 |
20140167635 | Method for Starting a High-Pressure Discharge Lamp - A method for starting a high-pressure discharge lamp by means of a starter, having a starting capacitor, a starting switch and a starting transformer, wherein the method comprises the following temporally successive steps: charging the starting capacitor to a predetermined voltage; closing the starting switch; and opening the starting switch before the current through the starting switch reaches zero for the first time in terms of its fundamental component. | 06-19-2014 |
20140239838 | IGNITION APPARATUS - An ignition apparatus has an ignition transformer that has a primary winding and a secondary winding. The transformer has a first primary winding connection for connection to a first supply voltage potential and a second primary winding connection for connection to a second supply voltage potential via a controllable switching element. Accordingly a first capacitor is connected up between the first primary winding connection and the second supply voltage potential and a second capacitor is connected up between the second primary winding connection and the second supply voltage potential. | 08-28-2014 |
20140246988 | CONTROLLING CIRCUIT FOR AN LED DRIVER AND CONTROLLING METHOD THEREOF - The present invention relates to a controlling circuit and controlling method for an LED driver implemented as a flyback topology. The controlling circuit may be at a primary side of a transformer of the LED driver, and include a sampling circuit, an on time sensing circuit of an output diode, a regulating signal generator, and a PWM controller. The sampling circuit may generate a sampling signal indicating output current by sampling at the primary transformer side. The on time sensing circuit can detect an on time of the output diode. The regulating signal generator can generate a regulating signal by regulating the sampling signal, a voltage reference, and the on time of the output diode. The PWM controller may generate a controlling signal to control operation of a switching device of the LED driver to maintain a substantially constant output current in accordance with the regulating signal. | 09-04-2014 |
20140306617 | HIGH-FREQUENCY DISCHARGE IGNITION COIL APPARATUS AND HIGH-FREQUENCY DISCHARGE IGNITION APPARATUS - Provided is a compact ignition coil apparatus that can realize reliable insulation breakdown and spark discharge with high discharge current. A high-frequency discharge ignition coil apparatus includes: a capacitor | 10-16-2014 |
20150366010 | LINE RIPPLE COMPENSATION FOR SHIMMERLESS LED DRIVER - A power converter controller includes an oscillator, a drive circuit, and a frequency modulator. The drive circuit receives a clock signal from the oscillator and generates a drive signal in response thereto to control switching of a switch of the power converter. The frequency modulator controls the frequency of the clock signal in response to an inductor voltage across an inductor of the energy transfer element to reduce a peak-to-peak ripple value in an output current of the power converter. The frequency modulator controls the frequency of the clock signal during each line half cycle to be a fixed frequency when the inductor voltage is less than or equal to a threshold voltage. When the inductor voltage is greater than the threshold voltage the frequency modulator varies the frequency to be less than the fixed frequency to adjust a shape of an input current of the power converter. | 12-17-2015 |
20160014861 | SYSTEMS AND METHODS FOR INTELLIGENT DIMMING CONTROL USING TRIAC DIMMERS | 01-14-2016 |
20160014865 | Systems and Methods for Intelligent Dimming Control Using Triac Dimmers | 01-14-2016 |
20160066404 | HIGH-FREQUENCY POWER SUPPLY DEVICE - A transformer is formed into a substantially U shape. The length of the transformer may thus be secured, and also the length of pattern wiring between an input terminal and an output terminal of a secondary coil of the transformer and the control terminals of a semiconductor device may be reduced. Moreover, the primary coil and the secondary coil of the transformer are arranged in parallel. The coupling coefficient between the primary coil and the secondary coil is thereby increased. An LC resonant circuit, not including the induction coil, and a switching circuit and the transformer are accommodated inside a housing. A water-cooling radiator is provided inside the housing, and also air inside the housing is circulated by a cooling fan while being guided to the radiator. | 03-03-2016 |
20160073457 | LIGHTING DEVICE AND LUMINAIRE - A lighting device includes: a DC/DC converter including two switching elements connected in series and a resonant circuit connected to a connection point between the two switching elements; and a control unit configured to control driving of the two switching elements. The control unit is configured to: perform intermittent driving in which a switching period and a non-switching period are alternately repeated, the switching period being a period in which the control unit switches ON and OFF the two switching elements respectively and inversely; and the non-switching period being a period in which the control unit stops switching ON and OFF the two switching elements; and provide, in an initial part of the switching period, a frequency gradual decrease period in which a driving frequency for driving the two switching elements is gradually decreased. | 03-10-2016 |