一种单级式高功率因数无电解电容AC/DC LED驱动电源略  

A Single-stage Electrolytic Capacitor-less AC/DC LED Driver With High Input Power Factor

作　　者：张艺文[1] 金科[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2015年第22期5851-5858,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51377080);江苏省自然科学基金杰出青年基金资助项目(BK20130036);高等学校博士学科点专项科研基金资助项目(133218110015)~~

摘　　要：传统的发光二极管(lighting emitting diode,LED)驱动电源一般含有电解电容作为储能元件,其寿命成为制约LED驱动电源寿命的主要因素,并且会限制功率密度进一步提高。因此,提出一种在反激变换器变压器上增加一个绕组并增加全桥辅助电路的无电解电容的LED驱动电源,其不仅去除了电解电容,延长了LED驱动电源的使用寿命,减小了驱动电源的体积,并且实现了功率因数校正,减小了输出电流两倍工频交流分量,输出电流近似恒定。本文详细分析了这种变换器的工作原理并试制了一台样机给出了实验结果。Traditional lighting emitting diode（LED） drivers generally use electrolytic capacitors as the storage element which will restrict the lifetime and power density of drivers. In this paper, an electrolytic capacitor-less LED driver which pluses an auxiliary winding in the transformer and an additional full-bridge circuit to Flyback the converter is proposed. It not only eliminates the electrolytic capacitor to extend the lifetime, but also achieves high input power factor and almost constant output currents for LED loads. The operational principle, detailed design of the main circuit, and control strategy are presented in this paper. A prototype with 48 V/0.7 A output is constructed and tested to verify the effectiveness of the electrolytic capacitor-less LED driver.

关 键 词：LED驱动 功率因数校正 无电解电容 恒流 储能电容大纹波 

分 类 号：TM46[电气工程—电器]