An Auxiliary Passive Circuit and Control Design for Wireless Power Transfer Systems in DC Microgrids with Zero Voltage Switching and Accurate Output Regulations

Hu Xiong, Bin Xiang and Yuan Mao ()
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Hu Xiong: Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Bin Xiang: Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Yuan Mao: College of Information Engineering, The Zhejiang University of Technology, Hangzhou 310023, China

Energies, 2023, vol. 16, issue 2, 1-21

Abstract: This paper presents an auxiliary passive circuit and control design for wireless power transfer (WPT) systems in DC microgrids to achieve optimal power transfer efficiency while maintain accurate output voltage regulation. An auxiliary inductance is added at the transmitter resonator to form a current sink to ensure zero voltage switching (ZVS) of the primary-side full-bridge inverter with even extremely light load conditions. Moreover, an adaptive proportional–integral (PI) controller is adopted to track the output voltage references by regulating the phase shift angle of the phase shift control for the full-bridge inverter. The coefficients of the adaptive PI controller are determined by the inductance of the auxiliary inductance. Both simulation and experimental results validated the effectiveness of the proposed circuit and control design in achieving optimal efficiency and output voltage regulation for WPT systems in DC microgrids with source and load variations.

Keywords: wireless power transfer (WPT); DC microgrids; optimal efficiency; zero voltage switching (ZVS); output voltage regulation (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: 2023
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