中国电气工程学报（英文） ›› 2018, Vol. 4 ›› Issue (2): 50-55.

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  • 出版日期:2018-06-25 发布日期:2019-10-31

Dual-Coupled Robust Wireless Power TransferBased on Parity-Time-symmetric Model

Gongjun Liu, Bo Zhang*   

  1. School of Electric Power, South China University of Technology, Guangzhou 510640, China
  • Online:2018-06-25 Published:2019-10-31
  • Contact: *, E-mail: epbzhang@scut.edu.cn.
  • About author:Gongjun Liu received the B.S. degree in electrical engineering and automation from South China University of Technology, Guangzhou, China, in 2016. She is currently working toward the Master’s degree in power electronics at School of Electric Power, South China University of Technology, Guangzhou, China. Her research interests include modeling and analysis of wireless power transfer systems and coupledmode theory. Bo Zhang received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 1982, the M.S. degree in power electronics from Southwest Jiaotong University, Chengdu, China, in 1988, and the Ph.D. degree in power electronics from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994. He is currently a Professor in the School of Electric Power, South China University of Technology, Guangzhou, China. He has authored or coauthored three books in IEEE-Wiley and Springer, more than 450 papers, and over 100 patents. His current research interests include nonlinear analysis, modeling and control of power electronic converters, and wireless power transfer applications.
  • Supported by:
    Supported by Key Project of National Natural Science Foundation of China (No. 51437005).

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Abstract: The characteristics of the wireless power transfer(WPT) system vary under different transfer distances. As distance increases, efficiency drops off sharply, limiting the wider use of WPT technology. In order to mitigate this problem, this paper proposes a novel dual-coupled WPT system, where both electric-coupled mechanism and magnetic-coupled mechanism are utilized to enhance the transfer efficiency. Furthermore, a Parity-Time(PT)-symmetric circuit is utilized to realize robustness of the system. The coupled-mode model of the system is established and the expressions of operating frequency, transfer efficiency and output power are deduced. Analysis results indicate that in the unbroken PT-symmetric state, compared with single-coupled systems, the proposed system can keep constant performance within a longer distance; in broken PT-symmetric state, the proposed system has higher transfer efficiency. Simulated results and comparative results are in accordance with the theoretical analysis. Within 1.4m, this scheme can transfer power with constant efficiency of 77% and constant output power of 70W.

Key words: Wireless power transfer(WPT), parity-time(PT)-symmetric, coupled-mode model, robust