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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
8179057 Electronic ballast for discharge lamp May. 15, 2012
8179054 LED power supply May. 15, 2012
8179053 Power supply for an LCD display May. 15, 2012
8174269 Abnormal switching monitoring device and abnormal switching monitoring method May. 8, 2012
8174208 Driver for operating a gas discharge lamp May. 8, 2012
8174207 Lamp and driving device for backlight assembly having the same May. 8, 2012
8174204 Lighting system with power factor correction control data determined from a phase modulated signal May. 8, 2012
8174202 Lamp driving circuit May. 8, 2012
8174201 Self-oscillating transformerless electronic ballast May. 8, 2012
8174199 Discharge lamp lighting apparatus, method for controlling the same, and projector May. 8, 2012
8169164 Light output control device for laser light source May. 1, 2012
8169163 Control device and LED light emitting device using the control device May. 1, 2012
8169161 Electronic circuits for driving series connected light emitting diode strings May. 1, 2012
8169156 Control method capable of preventing flicker effect and light emitting device thereof May. 1, 2012
8169151 DC/AC converter and controller thereof May. 1, 2012
8169149 Circuit arrangement and method for the operation of at least one discharge lamp May. 1, 2012
8164280 Electronic ballast Apr. 24, 2012
8164276 LED drive device, LED drive method and lighting system Apr. 24, 2012
8164275 Drive circuit for high-brightness light emitting diodes Apr. 24, 2012
8164272 8-pin PFC and ballast control IC Apr. 24, 2012
8164270 Discharge lamp lighting circuit Apr. 24, 2012
8164269 Discharge lamp lighting device and lighting fixture Apr. 24, 2012
8159155 Light emitting unit arrangement and control system and method thereof Apr. 17, 2012
8159151 Control circuit for inverter Apr. 17, 2012
8154218 Method and apparatus for retrofitting HID lamps with system to periodically adjust operating wattage Apr. 10, 2012
8154215 Discharge lamp lighting apparatus Apr. 10, 2012
8154214 Switching power supply for an illumination device with precision current control Apr. 10, 2012
8154213 Circuit arrangement and method for operating a high-pressure discharge lamp Apr. 10, 2012
8148918 Light source driving device Apr. 3, 2012
8148916 Driving device of a light source module, light source module having the driving device, driving method of the light source module, and display device having the driving device Apr. 3, 2012
8148915 Electronic ballast device and operation method thereof Apr. 3, 2012
8148910 Differential driving circuit for powering a light source Apr. 3, 2012
8148909 Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp Apr. 3, 2012
8148908 Power supply control device for lamp Apr. 3, 2012
8143810 Drive device for LEDs and related method Mar. 27, 2012
8143804 Light source driving device Mar. 27, 2012
8143800 Circuits and methods for driving a load with power factor correction function Mar. 27, 2012
8143797 DC/AC inverter Mar. 27, 2012
8143796 Electronic ballast with controlled filament preheating using half-wave lamp current detection Mar. 27, 2012
8143795 Circuit arrangement for firing a discharge lamp Mar. 27, 2012
8143794 Low voltage light source driving circuit Mar. 27, 2012
8138682 Symmetrical RF power supply for inductively coupled electrodeless lamps Mar. 20, 2012
8138681 Driving circuit, LED head and image forming apparatus Mar. 20, 2012
8129918 Power supply, display device, and light source driving apparatus Mar. 6, 2012
8129915 Discharge lamp operating device, illumination device and liquid crystal display device Mar. 6, 2012
8129914 Operating circuit for light-emitting diodes Mar. 6, 2012
8125161 Light emitting device driving apparatus and method for driving the same Feb. 28, 2012
8125156 Circuit arrangement for operating at least one high-pressure discharge lamp Feb. 28, 2012
8120287 High efficiency power system for a LED display system Feb. 21, 2012
8120272 AC delay angle control for energizing a lamp Feb. 21, 2012

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