基于二次型Buck PFC变换器的无频闪无变压器LED驱动电源

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摘要提出了一种基于二次型Buck功率因数校正 (power factor correction,PFC) 变换器的无频闪无变压器LED驱动电源,分析了其工作原理和工作特性.它由共用一个开关管的两个Buck变换器级联构成,其中前级Buck变换器实现PFC功能,后级Buck变换器调节LED电流.该电源无需使用高降压比的变压器也可以驱动低正向导通电压的LED,它只使用一个控制器不仅实现了PFC功能,而且极大的降低了流过LED的二倍工频电流纹波,从而实现无频闪.最后通过7W的实验样机验证了理论分析的正确性.

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	阎铁生
	许建平
	曹太强
	刘雪山
	高旭
	周国华

关键词 ： LED驱动电源, 二次型Buck变换器, 功率因数校正, 无频闪

Abstract：A flicker-free transformerless LED driving circuit based on quadratic buck power factor correction(PFC) converter is proposed and analyzed in this paper. It combines two cascaded buck converters with single switch. The input buck converter can realize PFC, and output buck converter can regulate LED current. With single controller, the proposed LED driving circuit can not only achieve high power factor to comply with EN61000-3-2 standard and low output voltage without a high step-down transformer, but also reduce second-order line frequency current ripple flowing through LED to eliminate light flicker of LED. Experimental results of a 7W prototype are presented to verify the analysis results of the proposed converter.

Key words： LED driver circuit quadratic buck converter power factor correction(PFC) flicker- free

收稿日期: 2014-09-10 出版日期: 2015-09-14

PACS:

TM464

基金资助:国家自然科学基金项目(51177140和61371033); 中央高校基本科研业务费专项资金 (2682013ZT20和SWJTU11CX029)

作者简介: 阎铁生男,1981年生,讲师,博士,主要从事开关电源拓扑及控制技术研究,功率因数校正变换器及其控制技术研究等.许建平男,1963年生,教授,博士生导师,主要从事电力电子系统的控制技术,开关电源新颖控制技术,再生能源发电技术,移动信息设备电源管理技术等.

引用本文:

阎铁生,许建平,曹太强,刘雪山,高旭,周国华. 基于二次型Buck PFC变换器的无频闪无变压器LED驱动电源[J]. 电工技术学报, 2015, 30(12): 512-519. Yan Tiesheng,Xu Jianping,Cao Taiqiang,Liu Xueshan,Gao Xu,Zhou Guohua. A Flicker-Free Transformerless LED Driving Circuit Based on Quadratic Buck PFC Converter. Transactions of China Electrotechnical Society, 2015, 30(12): 512-519.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I12/512

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