Advanced Electric Power Conversion Laboratory
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Contact

Name: Minfan Fu

Email:fumf@shanghaitech.edu.cn

Address:

School of Info. Science and Tech.

ShanghaiTech University

Room 534, SIST Building 3

393 Middle Huaxia Road

Pudong, Shanghai 201210

Tel: +86-021-20684455


A journal paper is accepted by IEEE Trans. Power Electron.

S. Wang, J. Liang, and M. Fu*,Analysis and Design of Capacitive Power Transfer Systems Based on Induced Voltage Source Model", IEEE Transactions on Power Electronics.      [URL]: https://ieeexplore.ieee.org/abstract/document/9040655


Abstract:

Capacitive power transfer is a promising mid-range wireless charging technique. The existing induced current source model suffers from the coupling variation issue, which causes troubles in resonance design and compensation development.This paper explores an induced voltage source model for the capacitive coupler. Using this model, the six coupling-dependent capacitors between each pair of plates are equivalently represented by the self-capacitors and induced voltage sources. The self-capacitance is verified to be coupling independent. Based on this model, the power transfer capability, the efficiency, and the influence of adding external shunt capacitors are easily analyzed. This model is very helpful in investigating the existing topology and developing new compensations, such as the CLL-L compensation. Finally, a capacitive coupler is built to verify the model, based on which a CLLL compensation is implemented for constant output voltage application. The achieved system peak efficiency is 88%.