Electrostatically Tunable Mutual Inductance for Frequency Splitting Elimination in Wireless Power Transfer

Mutual inductance highly determines the performance of dual-coil magnetic coupled resonance wireless power transfer (MCR-WPT). Due to the frequency splitting, the system gives inferior energy transfer efficiency in overcoupled state, where the two coils are close with each other and a large mutual i...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-02, Vol.58 (2), p.1-6
Main Authors: Sun, Changxing, Yang, Wenrong, He, Yifan, Dong, Cunzheng, Liang, Xianfeng, Wei, Yuyi, Chen, Huaihao, Sun, Nian-Xiang
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Coils
Energy transfer
Frequency ranges
Frequency splitting
Inductance
Lead zirconate titanates
Magnetic cores
Magnetic resonance
Magnetism
magnetoelectric (ME) composites
Magnetoelectric effects
Magnetostriction
mutual inductance
Optimization
Splitting
wireless power transfer (WPT)
Wireless power transmission
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Summary:Mutual inductance highly determines the performance of dual-coil magnetic coupled resonance wireless power transfer (MCR-WPT). Due to the frequency splitting, the system gives inferior energy transfer efficiency in overcoupled state, where the two coils are close with each other and a large mutual inductance is presented. This raises the need to finely tune the mutual inductance for frequency splitting elimination and consequently performance optimization. Meanwhile, with the built MCR-WPT system, the mutual inductance remains constant given a fixed distance between the coils, which limits its potential application. In this article, the resonant coils with magnetoelectric composites core consisting of Metglas/lead zirconate titanate/Metglas were adopted to tune the mutual inductance. A large tunability of 56.5% in the low-frequency range and a tunability of 16.6% in the high-frequency range were achieved. The tunability of the mutual inductance indicates its great potential and provides a new route to eliminate the frequency splitting for high efficient MCR-WPT.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3132768