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Class Information
Number: 315/276
Name: Electric lamp and discharge devices: systems > Pulsating or a.c. supply > Transformer in the supply circuit
Description: Systems provided with a transformer connected between the source of supply and the load device for supplying electric current and/or potential to the load device.










Sub-classes under this class:

Class Number Class Name Patents
315/280 Convertible to inductance 5
315/279 Current regulator in the primary circuit 102
315/277 Plural transformers in the supply circuit 189
315/282 Regulating transformer 187
315/281 Relatively movable core and coil-type transformer 12
315/278 Three or more coil-type transformers 174


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13

Patent Number Title Of Patent Date Issued
8704453 Driving circuit and lighting equipment using the same Apr. 22, 2014
8692478 Current balancing circuit Apr. 8, 2014
8686662 Timed supercapacitor charge-up and emergency illumination Apr. 1, 2014
8669715 LED driver having constant input current Mar. 11, 2014
8664878 Ballast with an arc quenching circuit Mar. 4, 2014
8629627 Multi-transformer LLC resonant converter circuits and methods Jan. 14, 2014
8624520 Electrical appliance having a lighting device having light emitting diodes Jan. 7, 2014
8614553 Illuminant operating appliance with potential separation Dec. 24, 2013
8587215 Self-dimming OLED lighting system and control method Nov. 19, 2013
8575850 System and method for supplying constant power to luminuous loads with power factor correction Nov. 5, 2013
8558474 Method and apparatus for dimming Oct. 15, 2013
8536793 Controlling a current supplied to a load Sep. 17, 2013
8507875 Ultraviolet irradiation apparatus Aug. 13, 2013
8508151 Power unit and lighting apparatus Aug. 13, 2013
8502464 Underwater lighting system and method Aug. 6, 2013
8492991 Lighting fixture system for illumination using cold cathode fluorescent lamps Jul. 23, 2013
8471489 Power regulator and remote power control device Jun. 25, 2013
8461766 Driver circuit with primary side state estimator for inferred output current feedback sensing Jun. 11, 2013
8456108 LED lighting apparatus Jun. 4, 2013
8450945 High-frequency lamp and method for the operation thereof May. 28, 2013
8441201 LED driving apparatus May. 14, 2013
8436547 Multi-lamp driving system May. 7, 2013
8432109 Method and apparatus for a LED driver with high power factor Apr. 30, 2013
RE44133 Fixed operating frequency inverter for cold cathode fluorescent lamp having strike frequency adjusted by voltage to current phase relationship Apr. 9, 2013
8390210 Light driver circuit device and backlight device Mar. 5, 2013
8384295 Ballast circuit for LED-based lamp including power factor correction with protective isolation Feb. 26, 2013
8373354 Backlight unit driver Feb. 12, 2013
8362709 Current balance circuit having protection function, and power supply Jan. 29, 2013
8344642 Lighting device having a rail device that can be fixed to a surface of an object Jan. 1, 2013
8339060 Ignition transformer for a discharge lamp Dec. 25, 2012
8339055 Inrush current limiter for an LED driver Dec. 25, 2012
8330384 Power supply unit, light emitting apparatus and dimming method thereof Dec. 11, 2012
RE43808 Phase shift modulation-based control of amplitude of AC voltage output produced by double-ended DC-AC converter circuitry for powering high voltage load such as cold cathode fluorescent lamp Nov. 20, 2012
8310164 Multi-lamp driving system Nov. 13, 2012
8294383 Electronic driving device for lamps, in particular HID lamps Oct. 23, 2012
8294378 Controlling a brightness of a lamp Oct. 23, 2012
8278829 Method and apparatus for reducing radiation from a light fixture Oct. 2, 2012
8278843 Method for operating a switching-mode power supply Oct. 2, 2012
8274234 Dimming ballast with parallel lamp operation Sep. 25, 2012
8258718 Lighting device and display device Sep. 4, 2012
8258716 Driving power supply system of an active type LED with multiple channels Sep. 4, 2012
8247986 Power conversion controller having an adaptive peak current reference Aug. 21, 2012
8242704 Apparatus, method and system for providing power to solid state lighting Aug. 14, 2012
8242705 Frequency modulation method and device for high intensity discharge lamp Aug. 14, 2012
8227989 Discharge element with discharge-control electrode and the control circuit thereof Jul. 24, 2012
8228001 Method and apparatus of driving LED and OLED devices Jul. 24, 2012
8222836 Balancing transformers for multi-lamp operation Jul. 17, 2012
8222828 Circuit arrangement for igniting and operating a discharge lamp Jul. 17, 2012
8213194 Control device for a flyback converter Jul. 3, 2012
8198824 Electronic ballast for restarting high-pressure discharge lamps in various states of operation Jun. 12, 2012

1 2 3 4 5 6 7 8 9 10 11 12 13










 
 
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