Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Asymmetric coaxial three-coil wireless power transmission system optimization

  • Dongdong Zhang (School of Electrical Engineering, Guangxi University) ;
  • Xuesong Li (School of Electrical Engineering, Guangxi University) ;
  • Jie Yang (School of Electrical Engineering, Guangxi University) ;
  • Xiang Li (School of Electrical Engineering, Guangxi University) ;
  • Thomas Wu (School of Electrical Engineering, Guangxi University)
  • Received : 2022.11.09
  • Accepted : 2023.03.02
  • Published : 2023.09.20
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Abstract

With the rapid development of wireless power transmission (WPT) technology and the demand for a wide range of applications, the common two-coil system is becoming increasingly mature. However, the monotonous structure of two-coil systems limits their development. By incorporating relay coils, the distance of power transmission, efficiency, and electromagnetic field (EMF) leakage can be effectively improved. In this paper, the three-coil system is analyzed, and the relay coil parameters are optimized by an evolutionary algorithm. After that, based on the coil optimization, the compensation capacitance of the relay coil is analyzed and an analytical formula of the compensation capacitance of the optimized relay coil is obtained. The results show that the parameter-optimized system reduces current by 86.9%, increases efficiency by 10%, and suppresses EMF leakage by 18 dB. Meanwhile, the capacitor optimization further improves the transmission efficiency of the system.

Keywords

Acknowledgement

This work was supported in part by the National Natural Science Foundation of China (5210071288); the National Key Research and Development Program of China (2019YFE0118000); the Guangxi Key Research and Development Program of China (2021AA11008); the Guangxi Science and Technology Base and Talent Special Project of China (2021AC19120) and Open Research Project Programme of the State Key Laboratory of Internet of Things for Smart City (SKL-IoTSC(UM)-2021-2023/ORP/GA07/2022). The Cross disciplinary research project of civil engineering of Guangxi University.

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