电流断续模式Boost功率因数校正变换器的变占空比控制

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Abstract DCM Boost PFC converter features zero-current turn-on for the switch, no reverse recovery in diode and constant frequency operation, however, the input power factor(PF)is relatively low when the duty cycle is constant within one half the line cycle. This paper derives the expressions of the input current and PF of DCM Boost PFC converter, and based on which, a variable duty cycle control is proposed so as to improve the PF to nearly 1 in the whole input voltage range. A method of fitting the duty cycle is further proposed for simplifying the circuit implementation. Besides a higher PF, the proposed variable duty cycle control achieves a lower output voltage ripple and a higher efficiency over the constant duty cycle control. The experimental results from a 120W universal input prototype are given to verify the effectiveness of the proposed method.

Key words： Power factor correction discontinuous current mode(DCM) variable duty cycle control

Received: 07 January 2010 Published: 07 March 2014

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TM46

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	Yao Kai
	Ruan Xinbo
	Mao Xiaojing
	Ye Zhihong

Cite this article:

Yao Kai,Ruan Xinbo,Mao Xiaojing等. DCM Boost PFC Converter with Variable Duty Cycle Control[J]. Transactions of China Electrotechnical Society, 2011, 26(11): 14-24.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I11/14

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