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ZHANG Jie,ZHANG Fang-hua,NI Jian-jun.An LED Driver to reduce Storage Capacitance[J].JOURNAL OF POWER SUPPLY,2013,11(2):36-39,45
An LED Driver to reduce Storage Capacitance
Received:October 14, 2011  Revised:January 19, 2012
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Keywords:LED Driver  long life  without electrolytic capacitors
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ZHANG Jie Nanjing University of Aeronautics and Astronautics didoardell@163.com
ZHANG Fang-hua Nanjing University of Aeronautics and Astronautics zhangfh@nuaa.edu.cn
NI Jian-jun Nanjing University of Aeronautics and Astronautics
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      For the advantages of high efficiency, good optical performance, long lifetime, environmentally friendly, insensitive to vibration, the high-brightness light-emitting diode is a promising new generation of green lighting source. The lifetime of the LED driver is the bottleneck of the whole system, which limits the LED luminaries' lifetime. An LED with biased square current driver was proposed. The method can decrease the power ripple in the bus capacitor. At the same voltage ripple, the volume of the bus capacitor decreases to 55.8%. So film capacitor can be adopted to replace electrolytic capacitor.