LED driving system

The invention provides an LED driving system, with which an alternating current (AC) power source is employed to drive light emitting diodes (LEDs). A filter circuit is connected to the AC power source for receiving AC voltage and current so as to filter the high order harmonic components of the AC...

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Bibliographic Details
Main Authors TSENG, WEIING, TSAI, YIUAN, LIANG, TSORNG-JUU, CHEN, JIANN-FUH
Format Patent
LanguageChinese
English
Published 16.03.2012
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary:The invention provides an LED driving system, with which an alternating current (AC) power source is employed to drive light emitting diodes (LEDs). A filter circuit is connected to the AC power source for receiving AC voltage and current so as to filter the high order harmonic components of the AC voltage and current thereby generating a filtered AC voltage. A rectifier circuit having a first output terminal and a second output terminal is connected to the filter circuit for rectifying the filtered AC voltage so as to generate a rectified voltage and current. A valley fill circuit is connected to the rectifier circuit to change the conduction period of the rectifier circuit for increasing the power factor of the rectifier circuit and the utilization of LEDs. An LED illuminating circuit is connected to the valley fill circuit to receive the rectified voltage for driving LEDs to emit light.
Bibliography:Application Number: TW20100129846