A Three-Coil Constant Output Wireless Power Transfer System Based on Parity–Time Symmetry Theory

In a three-coil wireless power transfer system with relay coils, the transmission efficiency and output power of the system decreases with changes in the adjacent coupling coefficients. Controlling the power of three-coil wireless power transfer systems is also a significant challenge. To solve thes...

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Bibliographic Details
Published in:Applied sciences 2023-11, Vol.13 (22), p.12188
Main Authors: Yue, Yuntao, Yang, Jiahui, Li, Ruofan
Format: Article
Language:English
Subjects:
Efficiency
Electricity distribution
Electrons
Medical equipment
parity–time (PT) symmetry
power control
Receivers & amplifiers
relay coil
Symmetry
wireless power transfer (WPT)
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Summary:In a three-coil wireless power transfer system with relay coils, the transmission efficiency and output power of the system decreases with changes in the adjacent coupling coefficients. Controlling the power of three-coil wireless power transfer systems is also a significant challenge. To solve these issues, a three-coil wireless power transfer system based on parity–time symmetry is proposed in this paper. First, a three-coil parity–time wireless power transfer system was modeled based on a circuit model. Then, the transmission and gain characteristics of the three-coil parity–time wireless power transfer system were analyzed. It was found that when the system is in a parity–time-exact region, it can maintain a constant transmission efficiency and output power, and its output power is independent of the coupling coefficient. In addition, based on the output characteristics of the three-coil parity–time wireless power transfer system, a power control method and a working range detection method were proposed to attain a constant power output. Finally, a three-coil parity–time wireless power transfer system was experimentally tested.
ISSN:2076-3417
2076-3417
DOI:10.3390/app132212188