A Flicker-Free Transformerless LED Driving Circuit Based on Quadratic Buck PFC Converter
Yan Tiesheng1,Xu Jianping2,Cao Taiqiang1,Liu Xueshan2,Gao Xu2,Zhou Guohua2
1. School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039 Sichuan Province China; 2. Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education, School of Electrical Engineering, Southwest Jiaotong University Chengdu 610031 Sichuan Province China
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.
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.
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2015, Vol. 30 
