功率LED替代灯的新颖谐振式Buck镇流器

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Abstract LEDs are potential successors of incandescent lamps with high luminous efficacy and long lifetime. To improve the overall luminair efficacy and lifetime, the power efficiency and lifetime of LED ballasts become important factors. Efficiency gain in transformer-less power converters appears attractive for applications without isolation. Driving solid-state LED bulbs in an existing lighting ﬁxture from universal mains necessitates a high voltage step-down ratio in order to produce a relatively low output voltage suitable for LED lighting applications. Traditional non-isolated step-down Buck converters may suffer from poor efficiency due to the long diode freewheeling time at small duty cycles. In this paper, a resonance assisted Buck converter is proposed to achieve a high voltage step-down ratio and high converter efﬁciency, whilst maintaining durability and compatibility with existing incandescent dimmers. The performance of the proposed LED driver is veriﬁed experimentally.

Key words： LED ballast transformer-less converter resonance assisted LED replacement lamps

Received: 06 November 2010 Published: 20 March 2014

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TM923

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	Qu Xiaohui
	Siu Chung Wong
	Chi Kong Tse
	Zhang Jianzhong

Cite this article:

Qu Xiaohui,Siu Chung Wong,Chi Kong Tse等. Resonance Assisted Buck Converter for Offline Driving of Power LED Replacement Lamps[J]. Transactions of China Electrotechnical Society, 2012, 27(4): 159-165.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I4/159

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