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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:

Patent Number Title Of Patent Date Issued
7309963 Smoothing circuit for improving EMC Dec. 18, 2007
7307387 Switchable voltage converter Dec. 11, 2007
7307385 Boost controller capable of step-up ratio control Dec. 11, 2007
7304438 Method and apparatus for preventing instabilities in radio-frequency plasma processing Dec. 4, 2007
7301289 Discharge lamp lighting control device Nov. 27, 2007
7301288 LED buck regulator control IC Nov. 27, 2007
7298097 Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp Nov. 20, 2007
7294974 Fixed operating frequency inverter for cold cathode fluorescent lamp having strike frequency adjusted by voltage to current phase relationship Nov. 13, 2007
7294973 Discharge tube lighting apparatus, light source apparatus, and display apparatus Nov. 13, 2007
7294972 Feedback circuit for push-pull inverters Nov. 13, 2007
7291993 Method for driving a fluorescent lamp and an inverter circuit for performing such a method Nov. 6, 2007
7291992 Load failure protection circuit and discharge lamp driving apparatus Nov. 6, 2007
7291989 Lighting control circuit for vehicle lighting equipment Nov. 6, 2007
7288902 Color variations in a dimmable lighting device with stable color temperature light sources Oct. 30, 2007
7288899 Light source, projector, and method of driving arc tube Oct. 30, 2007
7288897 Circuit arrangement for operating at least one high pressure discharge lamp Oct. 30, 2007
7285924 Driving circuit for LCD backlight lamps Oct. 23, 2007
7285923 Display apparatus and driving pulse control method thereof Oct. 23, 2007
7285922 Driving apparatus for CCFL Oct. 23, 2007
7285919 Electronic ballast having improved power factor and total harmonic distortion Oct. 23, 2007
7282871 Backlight inverter for inductively detecting current Oct. 16, 2007
7282870 Driving apparatus for CCFL Oct. 16, 2007
7282867 Lighting device for discharge lamp Oct. 16, 2007
7279958 Synthesized resonation for an EL driver circuit Oct. 9, 2007
7279852 Apparatus and method for striking a fluorescent lamp Oct. 9, 2007
7279851 Systems and methods for fault protection in a balancing transformer Oct. 9, 2007
7279850 Decoupling circuits Oct. 9, 2007
7279848 Electronic ballast for a lamp Oct. 9, 2007
7279847 Pulse starting circuit Oct. 9, 2007
7279844 Electronic ballast Oct. 9, 2007
7277106 Scanning apparatus having a fluorescent lamp and control method thereof Oct. 2, 2007
7276864 Discharge lamp lighting device and projection type image display apparatus having the same Oct. 2, 2007
7276862 Stabilizer circuit for high-voltage discharge lamp Oct. 2, 2007
7276861 System and method for driving LED Oct. 2, 2007
7276859 Three-phase electronic ballast with improved three-phase EMI filter Oct. 2, 2007
7275835 Projector for changing driving frequency for driving light source lamp within allowable frequency range Oct. 2, 2007
7274574 Magnetically controlled transformer apparatus for controlling power delivered to a load with current transformer feedback Sep. 25, 2007
7274158 System for driving plural lamps Sep. 25, 2007
7274154 CFL ballast with passive valley fill and crest factor control Sep. 25, 2007
7274153 Portable fluorescent drop-light Sep. 25, 2007
7271545 Ballast and igniter for a lamp having larger storage capacitor than charge pump capacitor Sep. 18, 2007
7268501 Multi-lamp driving circuit Sep. 11, 2007
7265504 High efficiency power supply for LED lighting applications Sep. 4, 2007
7265502 Dimming apparatus of light emitting unit Sep. 4, 2007
7265499 Current-mode direct-drive inverter Sep. 4, 2007
7265498 Dimmer control system and controlling method thereof Sep. 4, 2007
7259525 High efficiency switching LED driver Aug. 21, 2007
7259523 Circuit arrangement Aug. 21, 2007
7259522 Lighting method, lighting apparatus and components used therefor Aug. 21, 2007
7259519 Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Aug. 21, 2007

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