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A Robust Parity-Time-Symmetric Hybrid Wireless Power Transfer System with Extended Coupling Range
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  • Dongyuan Qiu,
  • Hao Chen,
  • Wenchao Gu,
  • Bo Zhang,
  • Yanfeng Chen,
  • Xiao Wenxun,
  • Fan Xie
Dongyuan Qiu
South China University of Technology School of Electric Power

Corresponding Author:[email protected]

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Hao Chen
South China University of Technology School of Electric Power
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Wenchao Gu
South China University of Technology School of Electric Power
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Bo Zhang
South China University of Technology School of Electric Power
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Yanfeng Chen
South China University of Technology School of Electric Power
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Xiao Wenxun
South China University of Technology School of Electric Power
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Fan Xie
South China University of Technology School of Electric Power
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Abstract

Inductive wireless power transfer (IPT) and capacitive wireless power transfer (CPT) are currently the two main wireless power transfer technologies. Combining the coils of the IPT with the plates of the CPT creates a hybrid wireless power transfer (HPT) system, which can improve the transmission performance but introduces higher parameter sensitivity. Therefore, achieving stable output power and constant transfer efficiency over a wide range of coupling coefficient variations is still a major challenge for HPT. In this work, the parity-time (PT) symmetry theory is applied to an SS-type HPT system, and a circuit model of the PT-based HPT system is developed by using coupling capacitance and coupling inductance. The effect of connecting the plates to the homonymous end or heteronymous end of the coupling coils on the PT-symmetry range of the HPT system is discussed. It is found that the heteronymous end connection of the coils can effectively increase the range of constant output power and stable transfer efficiency. Finally, a prototype is built to verify the feasibility and effectiveness of the proposed PT-based HPT system. The transfer efficiency remains constant in the PT-symmetric range, and the inductive and capacitive coupling coefficients are smaller compared to IPT and CPT systems with the same parameters.