Analysis of Soft Switching Conditions of Push-Pull Isolated DC-DC Converter
Kan Zhizhong1, Feng Jianxing1, Meng Xianhui1,2, Wang Xiaohuan1, Zhang Chunjiang1
1. School of Electrical Engineering Yanshan University Qinhuangdao 066000 China; 2. Department of Mechanical And Electrical Engineering Tangshan University Tangshan 063000 China
Abstract：The current source isolated (CSI) DC-DC converter has the advantage of low current ripple, and it is beneficial to the service life of the lithium battery of the energy storage system. At the same time, reducing the switching loss is one of the key technologies to improve the power conversion efficiency. Therefore, this paper discusses the method of using the parasitic capacitance of the push-pull CSI DC-DC converter switch tube to perform resonance to meet the soft-switching conditions of the switch tube. Firstly, the gain characteristics and operating mode of the converter are analyzed. Secondly, based on the converter's equivalent circuit model, the soft-switching transient process of the push-pull CSI DC-DC converter is analyzed in detail, and the parametric expressions of the soft-switching conditions of all switches of the converter are derived. Finally, the simulation and experimental results verify the correctness of the soft-switching conditions.
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2021, Vol. 36 
