Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter

Shaoteng Zhang, Jinbin Zhao, Yuebao Wu, Ling Mao, Jiongyuan Xu and Jiajun Chen
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Shaoteng Zhang: College of Electrical Engineering, Shanghai University of Electric Power, No. 2588, Changyang Road, Yangpu District, Shanghai 200090, China
Jinbin Zhao: College of Electrical Engineering, Shanghai University of Electric Power, No. 2588, Changyang Road, Yangpu District, Shanghai 200090, China
Yuebao Wu: College of Electrical Engineering, Shanghai University of Electric Power, No. 2588, Changyang Road, Yangpu District, Shanghai 200090, China
Ling Mao: College of Electrical Engineering, Shanghai University of Electric Power, No. 2588, Changyang Road, Yangpu District, Shanghai 200090, China
Jiongyuan Xu: College of Electrical Engineering, Shanghai University of Electric Power, No. 2588, Changyang Road, Yangpu District, Shanghai 200090, China
Jiajun Chen: Pegasus Power Energy Co., Ltd., Hangzhou 310019, China

Energies, 2020, vol. 13, issue 19, 1-15

Abstract: This article addresses the problem of hard switching caused by the change of equivalent load in a wireless power transfer (WPT) system based on a class E inverter. Based on the load-sensitive characteristics of the class E inverter, the coil structure is improved, and the self/mutual inductance compensation method of the transmitting coil is proposed to realize a wide range of soft switching. On the basis of fully considering the coupling relationship between the source and load coils, a coil structure with multiple coils in series on the primary side is proposed, and the cross-coupling relationship between the coils is analyzed in detail and simplified. The inverter parameters and coupling mechanism were adjusted by means of coil series reverse connection. Combined with the parameter influence law and the load equivalent principle of the class E inverter, the margin of soft switching at the inverter side was increased and the load offset correction was carried out. The soft-switching effect of the equivalent load from 0 to 3.3 times of ideal load was obtained, and the purpose of improving system reliability and efficiency was achieved. Finally, the feasibility and effectiveness of the proposed method were verified by simulation and experiment.

Keywords: class E inverter; wireless power transmission system; source coil optimization; soft switch (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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