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Class Information
Number: 315/219
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Periodic switch in the primary circuit of the supply transformer
Description: Systems provided with a transformer connected between the source of supply and the load device for supplying electric current or potential to the load device and having the periodic switch connected in the primary circuit of the transformer so as to periodically interrupt the primary circuit.










Sub-classes under this class:

Class Number Class Name Patents
315/223 Condenser or inductance in the primary circuit 83
315/222 Plural interrupted transformer coil circuits 18
315/220 Plural transformers in the supply circuit 77
315/221 Secondary conductively connected to the primary 30


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Patent Number Title Of Patent Date Issued
8710757 Power converter for an LED assembly and lighting application Apr. 29, 2014
8710769 Discharge lamp lighting circuit Apr. 29, 2014
8704452 Illumination device with adjustable luminance and luminance adjustment method thereof Apr. 22, 2014
8704453 Driving circuit and lighting equipment using the same Apr. 22, 2014
8692474 Electronic ballast circuit for lamps Apr. 8, 2014
8680787 Load control device for a light-emitting diode light source Mar. 25, 2014
8680835 Buck DC-to-DC converter having a novel output protection mechanism Mar. 25, 2014
8680775 Lighting driver circuit and light fixture Mar. 25, 2014
8674615 Control apparatus for LED diodes Mar. 18, 2014
8664893 Feedback control circuit and LED driving circuit Mar. 4, 2014
8659238 Switching power supply with power feedback to keep lamp's brightness constant Feb. 25, 2014
8654485 Electronic ballast with protected analog dimming control interface Feb. 18, 2014
8643289 PWM controlling circuit and LED driver circuit having the same Feb. 4, 2014
8643297 Control circuit and control method for dimming LED lighting circuit Feb. 4, 2014
8633659 Lighting device, headlamp apparatus and vehicle using same Jan. 21, 2014
8624516 Power supply apparatus for light emitting diode Jan. 7, 2014
8615339 Control device of electric vehicles Dec. 24, 2013
8604707 Power supply Dec. 10, 2013
8593069 Power converter with compensation circuit for adjusting output current provided to a constant load Nov. 26, 2013
8587207 Electronic ballast Nov. 19, 2013
8587209 LED drivers and control methods Nov. 19, 2013
8587210 Electronic ballast for operating at least one discharge lamp Nov. 19, 2013
8581505 Primary-side based control of secondary-side current for a transformer Nov. 12, 2013
8581515 Light emitting diode driver Nov. 12, 2013
8575850 System and method for supplying constant power to luminuous loads with power factor correction Nov. 5, 2013
8575847 Control circuit of light-emitting element Nov. 5, 2013
8575849 Resonate driver for solid state light sources Nov. 5, 2013
8575901 Auto-selecting holding current circuit Nov. 5, 2013
8569970 LED with integrated constant current driver Oct. 29, 2013
8536793 Controlling a current supplied to a load Sep. 17, 2013
8525428 Power supply apparatus and method for a backlight system Sep. 3, 2013
8525429 Method for controlling gas discharge lamps Sep. 3, 2013
8487540 Variable light-level production using different dimming modes for different light-output ranges Jul. 16, 2013
8466628 Closed-loop load control circuit having a wide output range Jun. 18, 2013
8466632 LED device Jun. 18, 2013
8461766 Driver circuit with primary side state estimator for inferred output current feedback sensing Jun. 11, 2013
8456096 Thermally controlled driver/switching regulator, and methods of controlling and/or regulating a driver and/or switching regulator Jun. 4, 2013
8436540 Multi-lamp driving system May. 7, 2013
8415890 Power converter with compensation circuit for adjusting output current provided to a constant load Apr. 9, 2013
8410721 Electronic ballast and method for operating at least one discharge lamp Apr. 2, 2013
RE44101 Fluorescent lamp assembly having multiple settings and method Mar. 26, 2013
8400072 Light emitting device driver circuit driving light emitting device by positive and negative voltages and method for driving light emitting device by positive and negative voltages Mar. 19, 2013
8384295 Ballast circuit for LED-based lamp including power factor correction with protective isolation Feb. 26, 2013
8373351 Transition mode commutation for inverter Feb. 12, 2013
8354795 Program start ballast with true parallel lamp operation Jan. 15, 2013
8350488 Integrated backlight control system Jan. 8, 2013
8339055 Inrush current limiter for an LED driver Dec. 25, 2012
8305004 Apparatus and method for constant power offline LED driver Nov. 6, 2012
8305001 Light-emitting diode driver circuit and lighting apparatus Nov. 6, 2012
8294377 Power converter with compensation circuit for adjusting output current provided to a constant load Oct. 23, 2012

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