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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
7358686 Method and device for driving a gas discharge lamp Apr. 15, 2008
7358683 Automatic PWM controlled driver circuit and method Apr. 15, 2008
7358681 Switched constant current driving and control circuit Apr. 15, 2008
7358680 Bistate HID operation Apr. 15, 2008
7355356 Circuit arrangement and method for detecting a crest factor of a lamp current or a lamp operating voltage of an electric lamp Apr. 8, 2008
7355355 Discharge lamp lighting apparatus Apr. 8, 2008
7355352 Circuit and method for dynamic adjustment of operation conditions of a gas discharge lamp Apr. 8, 2008
7355351 Circuit arrangement having a converter without a transformer but with an inductor for the pulsed operation of dielectric barrier discharge lamps Apr. 8, 2008
7352139 Multiple lamp ballast control circuit Apr. 1, 2008
7352135 Lighting controller for lighting device for vehicle Apr. 1, 2008
7352134 Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control Apr. 1, 2008
7348734 Method for protecting a ballast from an output ground-fault condition Mar. 25, 2008
7348733 Discharge lamp lighting circuit and method Mar. 25, 2008
7345431 Circuit structure for driving a plurality of cold cathode flourescent lamps Mar. 18, 2008
7342365 Systems and methods for reducing input current in photoflash chargers Mar. 11, 2008
7339327 Resonant circuit for halogen lighting Mar. 4, 2008
7339326 DC/AC converter for supplying two gas discharge lamps Mar. 4, 2008
7339322 Apparatus and methods for making spectroscopic measurements of cathode fall in fluorescent lamps Mar. 4, 2008
7336040 Single-channel comprehensive protection circuit Feb. 26, 2008
7336038 Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps Feb. 26, 2008
7333027 Power supply for LED signal Feb. 19, 2008
7332876 Lighting apparatus for discharge lamp Feb. 19, 2008
7332873 Electrical circuit for fluorescent lamps Feb. 19, 2008
7332869 Power supply apparatus, backlight assembly and liquid crystal display apparatus having the same Feb. 19, 2008
7332868 Discharge lamp lighting device Feb. 19, 2008
7332867 Apparatus and method for driving lamp of liquid crystal display device Feb. 19, 2008
7330001 Ballast having a dimming device Feb. 12, 2008
7327102 Portable fluorescent task lamp Feb. 5, 2008
7327099 Ballast having a dimming device Feb. 5, 2008
7323829 Minimizing bond wire power losses in integrated circuit full bridge CCFL drivers Jan. 29, 2008
7323828 LED current bias control using a step down regulator Jan. 29, 2008
7323825 Ballast integrated circuit (IC) Jan. 29, 2008
7323824 Methods and apparatus for operating very high pressure short arc discharge lamps Jan. 29, 2008
7323823 Fluorescent lamp assembly having multiple settings and method Jan. 29, 2008
7321206 LED driving apparatus Jan. 22, 2008
7321205 Method and a controller to control power supply to a CCFL Jan. 22, 2008
7321202 System and method for reducing flicker of compact gas discharge lamps at low lamp light output level Jan. 22, 2008
7321201 Basic halogen convertor IC Jan. 22, 2008
7321199 Display apparatus and control method thereof Jan. 22, 2008
7319298 Digitally controlled luminaire system Jan. 15, 2008
7319297 Balanced current lamp module and multi-lamp circuit Jan. 15, 2008
7317287 Circuit for an LED array Jan. 8, 2008
7317286 Power supply apparatus for discharge lamp and control method for the same Jan. 8, 2008
7315138 Cold cathode fluorescent discharge lamp apparatus and operating method for same Jan. 1, 2008
7315134 Power supply for a high voltage device Jan. 1, 2008
7315130 Switching control for inverter startup and shutdown Jan. 1, 2008
7312588 Ballast with frequency-diagnostic lamp fault protection circuit Dec. 25, 2007
7312586 Ballast power supply Dec. 25, 2007
7312584 Plasma-generation power-supply device Dec. 25, 2007
7312583 Apparatus and method for driving a lamp unit, and liquid crystal display device using the same Dec. 25, 2007

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