A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

Xianxu Huo, Ke Xu, Ruixin Liu, Xi Chen, Zhanchun Li and Haiyun Yan
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Xianxu Huo: Electric Power Research Institute of State Grid Tianjin Electric Power Corporation, Tianjin 300384, China
Ke Xu: State Grid Tianjin Electric Power Corporation, Tianjin 300310, China
Ruixin Liu: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Xi Chen: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Zhanchun Li: State Grid Tianjin Electric Power Corporation Chengxi District Supply Company, Tianjin 300113, China
Haiyun Yan: State Grid Tianjin Maintenance Company, Tianjin 300250, China

Energies, 2019, vol. 12, issue 15, 1-25

Abstract: In this paper, a structure-reconfigurable resonant DC-DC (direct current – direct current) converter is presented. By controlling the state of the auxiliary switch, the converter could change the resonant structure to acquire a high efficiency and wide voltage gain range simultaneously. The characteristics of the LLC (inductor-inductor-capacitor) resonant converter are firstly analyzed. Based on this, through introducing additional resonant elements and adopting the topology morphing method, the proposed converter can be formed. Moreover, a novel parameter selection method is discussed to satisfy both working states. Then, a detailed loss analysis calculation is conducted to determine the optimal switching point. In addition, an extra resonant zero point is generated by the topology itself, and the inherent over-current protection is guaranteed. Finally, a 500 W prototype is built to demonstrate the theoretical rationality. The output voltage is constant at 400 V even if the input voltage varies from 160 to 400 V. A peak efficiency of 97.2% is achieved.

Keywords: structure-reconfigurable; soft-switching; resonant DC-DC converter; loss analysis; over-current protection (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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