A Two-Stage DC/DC Isolated High-Voltage Converter with Zero-Voltage Switching and Zero-Current Switching Applied in Electronic Power Conditioners

Wei Zheng, Cong Hu, Bin Zhao (), Xiao-Bao Su, Gang Wang, Xiao-Wan Hou and Bruce Gu
Additional contact information
Wei Zheng: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Cong Hu: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Bin Zhao: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Xiao-Bao Su: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Gang Wang: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Xiao-Wan Hou: Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
Bruce Gu: College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia

Energies, 2022, vol. 15, issue 17, 1-15

Abstract: This paper presents a two-stage DC/DC converter with high efficiency utilized in an electronic power conditioner (EPC), which is widely applicable in satellite communications, etc. The galvanically isolated converter contains two cascaded converters: a buck converter, which is a pre-regulator operating under a closed-loop condition, and a push–pull converter, which is intended to boost the input voltage, operating under an open-loop condition. In the push–pull converter, the power switches, including the main switches and the rectifier diodes, operate under zero-voltage switching (ZVS) and zero-current switching (ZCS) at both switch off and switch on, which minimizes the switching loss. Furthermore, all of the parasitic parameters, such as the parasitic capacitance, leakage inductance, and magnetizing inductance of the main transformer, are fully utilized. Therefore, the presented topology benefits from fewer semiconductors but higher efficiency. The proposed topology produces less EMI noise because of ZVS and ZCS processes whose fundamental switching frequency interference is relatively low. The presented converter achieves a wide bus voltage regulation range in a satellite because of the pre-regulation of the buck cell. The theoretical analysis is validated by a prototype and its experimental results. The maximum efficiency of the converter can be up to 94.5%, and the high-voltage output is 7000 V.

Keywords: two-stage DC/DC converter; zero-voltage switching (ZVS); zero-current switching (ZCS); high efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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