Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Matching network design for input impedance optimization of four-coil magnetic resonance coupling wireless power transfer systems

  • Wang, Zhixuan (College of Electrical Engineering, Xi'an University of Technology) ;
  • Sun, Xiangdong (College of Electrical Engineering, Xi'an University of Technology) ;
  • Zhang, Qi (College of Electrical Engineering, Xi'an University of Technology) ;
  • Chen, Zechi (College of Electrical Engineering, Xi'an University of Technology)
  • Received : 2021.12.13
  • Accepted : 2022.05.13
  • Published : 2022.09.20
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Abstract

The input impedance of a four-coil magnetic resonance coupling wireless power transfer (MRC-WPT) system is in the form of parallel resonance at the optimal operating frequency. When the operating frequency deviates slightly, the system input impedance decreases rapidly. At this time, if a voltage source radio frequency power amplifier (RFPA) is used as the excitation power supply, the operating current is increased, which is not conducive to device safety. In this paper, a matching network is designed and inserted between the power supply and the MRC-WPT circuit to convert the input impedance into a series resonant form, so the MRC-WPT circuit can be safely connected to the voltage source RFPA. Finally, an experimental prototype is built to verify the applicability of the proposed matching network.

Keywords

Acknowledgement

This work was supported in part by the National Natural Science Foundation of China under Grant 51577155 and the Natural Science Foundation of Shaanxi Province under Grant 2018JZ5006.

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