抑制输出能量倒灌的二次侧自复位正激变换器的能量传输过程分析

doi:10.19595/j.cnki.1000-6753.tces.191581

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Abstract In view of the shortcomings of the traditional magnetic reset methods, a self-magnetic reset method applied to the secondary side of the single switch forward converter was proposed. Based on the basic forward topology, the excitation energy transfer path was constructed by introducing energy storage capacitor, auxiliary inductor and two diodes, thus the excitation energy of the transformer was transmitted to the load end, and the utilization ratio of the transformer was also improved. The energy transmission process of the converter working in "forward CCM (L₁) / DCM (L₂) + flyback DCM" was analyzed in depth; the basic relationship under this mode was deduced, and the expression of input-output relationship and critical inductance was obtained; the parameters of key components were analyzed. Not only the reliable magnetic reset is realized, but also the converter efficiency is improved by 4.7% compared with the reset mode of resistor, capacitor and diode (RCD). Examples and experimental results show the feasibility of the proposed circuit and the correctness of theoretical analysis.

Key words： Forward converter secondary side self-magnetic reset efficiency

Received: 21 November 2019

PACS:

TM46

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	Articles by authors
	Liu Shulin
	Zhang Hailiang
	Wang Hangjie
	Peng Yinqiao
	Huang Kun

Cite this article:

Liu Shulin,Zhang Hailiang,Wang Hangjie等. A New Forward Converter with Self-Magnetically Reset on the Secondary Side[J]. Transactions of China Electrotechnical Society, 2020, 35(zk2): 477-483.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191581 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/Izk2/477

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