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Class Information
Number: 315/224
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Impedance or current regulator in the supply circuit
Description: Systems having an impedance or a current or voltage regulator connected in the supply circuit of the load device.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7843146 LED dimming control circuit Nov. 30, 2010
7843144 Method and apparatus for retrofitting HID lamps with system to periodically adjust operating wattage Nov. 30, 2010
7843142 Pulse width modulation apparatus and apparatus for driving light source having the same Nov. 30, 2010
7843141 Low cost step dimming interface for an electronic ballast Nov. 30, 2010
7843139 Apparatus and method for controlling the filament voltage in an electronic dimming ballast Nov. 30, 2010
7839096 Method of driving a lamp, lamp driving apparatus, and liquid crystal display device having the same Nov. 23, 2010
7839094 Voltage fed programmed start ballast Nov. 23, 2010
7839093 Circuit arrangement with continuously oscillating modulated operating frequency, and method, for the operation of high-pressure gas discharge lamps Nov. 23, 2010
7834558 Control of delivery of current through one or more discharge lamps Nov. 16, 2010
7833802 Stroboscopic liberation and methods of use Nov. 16, 2010
7830101 Regulation of electrical current through a resistive load Nov. 9, 2010
7830100 System for driving a plurality of lamps Nov. 9, 2010
7830099 System for driving a plurality of lamps Nov. 9, 2010
7830096 Circuit with improved efficiency and crest factor for current fed bipolar junction transistor (BJT) based electronic ballast Nov. 9, 2010
7830095 LED assembly and module Nov. 9, 2010
7830094 Driver arrangement for LED lamps Nov. 9, 2010
7825605 DA/AC convert for driving cold cathode fluorescent lamp Nov. 2, 2010
7819531 Projector Oct. 26, 2010
7816872 Dimmable instant start ballast Oct. 19, 2010
7812553 LED lighting device and method for controlling the same based on temperature changes Oct. 12, 2010
7812551 Lighting control method having a light output ramping function Oct. 12, 2010
7812548 Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp Oct. 12, 2010
7812546 Circuit structure for driving a plurality of cold cathode fluorescent lamps Oct. 12, 2010
7812545 Circuit arrangement for controlling the operation of an electronic transformer Oct. 12, 2010
7808190 Display apparatus and power supplying apparatus for lamp unit thereof Oct. 5, 2010
7808189 LED circuit arrangement having a diode rectifier Oct. 5, 2010
7804482 LCD and backlight module thereof Sep. 28, 2010
7804259 Discharge lamp ballast apparatus Sep. 28, 2010
7804256 Power control system for current regulated light sources Sep. 28, 2010
7804253 Self-exciting step-up converter Sep. 28, 2010
7795820 Emulation circuit Sep. 14, 2010
7791326 AC-powered, microprocessor-based, dimming LED power supply Sep. 7, 2010
7791288 Driving circuit for and semiconductor device for driving laser diode Sep. 7, 2010
7791283 Discharge lamp lighting apparatus Sep. 7, 2010
7786682 Discharge lamp lighting control method, computer program, discharge lamp lighting control apparatus, and power supply circuit Aug. 31, 2010
7786680 High efficiency and low cost cold cathode fluorescent lamp driving apparatus for LCD backlight Aug. 31, 2010
7786679 Electronic ballast for discharge lamps having an EOL monitoring circuit Aug. 31, 2010
7781989 Discharge lamp drive control circuit Aug. 24, 2010
7781986 Inverter with adjustable resonance gain Aug. 24, 2010
7781985 Constant current driver circuit with voltage compensated current sense mirror Aug. 24, 2010
7781982 Low-voltage power supply circuit for illumination, illumination device, and low-voltage power supply output method for illumination Aug. 24, 2010
7777428 Apparatus and method for controlling driving of lamp Aug. 17, 2010
7777425 Backlight circuit for LCD panel Aug. 17, 2010
7777424 Method and apparatus for controlling an input voltage to a light emitting diode Aug. 17, 2010
7777423 Electronic reactive current oscillation-reducing ballast Aug. 17, 2010
7772785 Parallel lighting system for surface light source discharge lamps Aug. 10, 2010
7772782 Light emitting diode (LED) driving device Aug. 10, 2010
7768215 Method and system for controlling transient current signals in an electronic ballast Aug. 3, 2010
7768214 Step-up/down regulator circuit and liquid crystal display device incorporating it Aug. 3, 2010
7764027 Dimmable control circuit Jul. 27, 2010

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