Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Energy efficiency characteristic analysis of tri-coil PT symmetric MC-WPT systems

  • Zhi-Juan Liao (Jiangsu Province Laboratory of Mining Electric and Automation, China University of Mining and Technology) ;
  • Qi-Wei Zhu (Jiangsu Province Laboratory of Mining Electric and Automation, China University of Mining and Technology) ;
  • Wen Ren (Jiangsu Province Laboratory of Mining Electric and Automation, China University of Mining and Technology) ;
  • Chen-Yang Xia (Jiangsu Province Laboratory of Mining Electric and Automation, China University of Mining and Technology) ;
  • Xu Liu (Jiangsu Province Laboratory of Mining Electric and Automation, China University of Mining and Technology)
  • Received : 2022.11.23
  • Accepted : 2023.03.30
  • Published : 2023.09.20
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Abstract

The parity-time (PT) symmetric magnetic coupling wireless power transfer (MC-WPT) system has received a great deal of attention since it was proposed. Its transmission efficiency has been greatly improved when compared with previous research. The operational amplifier (OA) is a typical construction method for PT symmetric MC-WPT systems. On this basis, to achieve a higher transmission efficiency and a longer effective power transmission distance at the same time, this paper constructs an OA-based tri-coil PT symmetric MC-WPT system. The analytical expressions of its singularity, PT symmetric state, and PT symmetric broken state are obtained. Then a complete set of parameter design criteria for the tri-coil PT symmetric system is derived. The transmission efficiency and resonant frequency of two-coil and tri-coil system are simulated on MATLAB software, and the simulation results are consistent with the theoretical analysis results. Finally, an experimental device is constructed to further verify the correctness of the theory. This paper demonstrates that the effective power transmission distance of the tri-coil PT symmetric MC-WPT system is more than twice that of the two-coil PT symmetric MC-WPT system, which can achieve a good balance between transmission efficiency and transmission distance.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China under Grant 52007188 and the Natural Science Foundation of Jiangsu Province under Grant BK20200659. And the National Natural Science Foundation of China under Grant 52107012.

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