Effects of Foreign Metal Object on Soft-Switching Conditions of Class-E Inverter in WPT

Wenxun Xiao, Ruigeng Shen, Bo Zhang, Dongyuan Qiu, Yanfeng Chen and Tian Li
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Wenxun Xiao: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Ruigeng Shen: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Bo Zhang: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Dongyuan Qiu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Yanfeng Chen: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Tian Li: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China

Energies, 2018, vol. 11, issue 8, 1-19

Abstract: A foreign metal object will deteriorate the performance of wireless power transfer (WPT) systems and cause insecurity issues. Therefore, the influence principles and rules of foreign metal objects on soft-switching conditions of Class-E inverters and the performance of WPT systems are developed in this paper. The effects of different metal materials on coil parameters at different frequencies and positions are analyzed first, then the effects of foreign metal objects on soft-switching conditions of Class-E inverters and the power transfer capability of WPT systems are investigated. Principle analyses and simulation results demonstrate that there are significantly different effects on the soft-switching conditions and power transfer when a foreign metal object is placed near the transmitter coil or the receiver coil. In addition, the monotonicity of the variation in power transfer also depends on the position of the foreign metal object. Finally, a WPT experimental prototype with a Class-E inverter is implemented to verify the influence principles and rules of foreign metal objects. The experimental results are highly consistent with the principle analyses and simulation results.

Keywords: wireless power transfer; foreign metal object; soft-switching conditions; Class-E inverter (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: 2018
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