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Class Information
Number: 315/226
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Plural periodic switches or multiple contact periodic switch
Description: Systems wherein (1) the periodic switch is provided with two or more pairs of circuit interrupting contacts, or (2) two or more periodic switches are provided in the circuit, the circuit being intermittently interrupted at two or more different places.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8710758 Dimmer system and damper circuit thereof Apr. 29, 2014
8686667 Lighting power source with controlled charging operation for driving capacitor Apr. 1, 2014
8604707 Power supply Dec. 10, 2013
8593068 Two-wire AC switch Nov. 26, 2013
8593072 Circuit assembly and method for operating a high pressure discharge lamp Nov. 26, 2013
8564216 Asymmetric end-of-life protection circuit for fluorescent lamp ballasts Oct. 22, 2013
8513903 Discharge lamp lighting device Aug. 20, 2013
8508143 Light emitting diode driving circuit Aug. 13, 2013
8502475 Discharge lamp ballast with feedback current control during an electrode heating operation Aug. 6, 2013
8497636 Auto-switching triac compatibility circuit with auto-leveling and overvoltage protection Jul. 30, 2013
8492998 Driver circuit for driving light-emitting elements including a power switching element Jul. 23, 2013
8487542 Load driving apparatus and driving method thereof Jul. 16, 2013
8441200 Electronic ballast and method for operating at least one first and second discharge lamp May. 14, 2013
8415893 Load control device, and lighting device Apr. 9, 2013
8378962 LCD backlight driving device with an isolating transformer Feb. 19, 2013
8363037 Reset circuit for power-on and power-off Jan. 29, 2013
8314567 Display apparatus Nov. 20, 2012
8278843 Method for operating a switching-mode power supply Oct. 2, 2012
8274232 Lighting system communications apparatus and method Sep. 25, 2012
8274234 Dimming ballast with parallel lamp operation Sep. 25, 2012
8258718 Lighting device and display device Sep. 4, 2012
8253343 Drive circuit to adjust a luminance of a light emitting element based on a PWM signal, and a portable information terminal including the drive circuit Aug. 28, 2012
8247994 LED illuminator and LED lamp Aug. 21, 2012
8247997 Ballast with lamp filament detection Aug. 21, 2012
8246175 Lighting device, light source device, projector, and discharge lamp lighting method Aug. 21, 2012
8237369 Light source apparatus and driving circuit thereof Aug. 7, 2012
8232734 Electronic ballast having a partially self-oscillating inverter circuit Jul. 31, 2012
8227997 Lamp driving circuit Jul. 24, 2012
8212494 Dimmer triggering circuit, dimmer system and dimmable device Jul. 3, 2012
8212497 Ballast with lamp-diagnostic filament heating, and method therefor Jul. 3, 2012
8198820 Two-wire dimmer circuit for a screw-in compact fluorescent lamp Jun. 12, 2012
8174207 Lamp and driving device for backlight assembly having the same May. 8, 2012
8174202 Lamp driving circuit May. 8, 2012
8164276 LED drive device, LED drive method and lighting system Apr. 24, 2012
8143794 Low voltage light source driving circuit Mar. 27, 2012
8120266 Driving circuit for driving a load Feb. 21, 2012
8106606 Voltage multiple dimming control apparatus Jan. 31, 2012
8093828 Drive circuit, light emitting diode head, and image forming apparatus Jan. 10, 2012
8089220 Circuit arrangement and method for operating a high-pressure discharge lamp Jan. 3, 2012
8084954 Lamp driving circuit Dec. 27, 2011
8084953 Changing power input to a gas discharge lamp Dec. 27, 2011
8063583 Dimming circuit for controlling luminance of light source and the method for controlling luminance Nov. 22, 2011
8049430 Electronic ballast having a partially self-oscillating inverter circuit Nov. 1, 2011
8044597 Drive circuit of fluorescent display Oct. 25, 2011
8035311 Light-emitting semiconductor device driver and method Oct. 11, 2011
8026670 Electronic circuit for driving electroluminescent display Sep. 27, 2011
8013539 Low-cost drive system for an LED triad Sep. 6, 2011
8008866 Hybrid light source Aug. 30, 2011
8004211 LED lighting device Aug. 23, 2011
7973487 Power supply circuit Jul. 5, 2011

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