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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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

Received: 10 September 2014 Published: 14 September 2015

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TM464

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	Articles by authors
	Yan Tiesheng
	Xu Jianping
	Cao Taiqiang
	Liu Xueshan
	Gao Xu
	Zhou Guohua

Cite this article:

Yan Tiesheng,Xu Jianping,Cao Taiqiang等. A Flicker-Free Transformerless LED Driving Circuit Based on Quadratic Buck PFC Converter[J]. Transactions of China Electrotechnical Society, 2015, 30(12): 512-519.

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

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