基于脉冲频率调制的高增益隔离型软开关直流变换器

doi:10.19595/j.cnki.1000-6753.tces.171194

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Abstract A high step-up isolated soft-switching DC/DC converter with pulse frequency modulation (PFM) was presented in this paper. The converter integrates a flyback converter with active clamp and similar voltage multiplier cells, and all the transistors have soft-switching. The structure of this proposed converter is simple and easy to achieve high voltage gain. At the same time, compared with the pulse width modulation (PWM) mode, the control mode of PFM modulation further reduces the power tube on the current stresses, which helps to improve the converter’s efficiency. The operation principles and characteristics of the proposed converter were analyzed in detail, and the two control strategies were compared. Finally, a 160W, 45V/380V laboratory prototype circuit was implemented to verify the effectiveness and accuracy of the theoretical analysis.

Key words： High step-up soft-switching pulse frequency modulation zero voltage switching (ZVS) zero current switching (ZCS)

Received: 18 August 2017 Published: 29 January 2019

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TM46

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	Articles by authors
	Zhang Zhiguo
	Liu Junliang
	Guo Qiang
	Chen Yan

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Zhang Zhiguo,Liu Junliang,Guo Qiang等. A High Step-Up Isolated Soft-Switching DC-DC Converter with Pulse Frequency Modulation[J]. Transactions of China Electrotechnical Society, 2019, 34(2): 296-305.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171194 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I2/296

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