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Optimization of Capacitive Wireless Power Transfer System for Maximum Efficiency

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Abstract

Optimal inductance and capacitance values of a receiver (Rx) LC matching network are proposed in order to maximize the efficiency of capacitive wireless power transfer (CWPT). To maximize the overall Tx-to-load efficiency, a general polynomial equation is proposed that gives an optimum Rx inductance and capacitance value under the given constraints of inductor losses, load impedance, and coupling capacitance. It is found that the efficiency is maximized when the Rx input resistance is approximately equal to the impedance of the coupling capacitance. It is also shown that Tx inductance and capacitance values should be chosen based on the trade-off between efficiency and Tx amplifier operation. The proposed method is applied to wireless charging of an Unmanned Aerial Vehicle (UAV) because the small Rx plate of CWPT can easily be mounted on a UAV. The fabricated system delivers 45 W with overall efficiency of 78.2% across wide lateral misalignments even with a small Rx plate at 6.78 MHz.

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Funding

This research was supported by Incheon National University (#2017-0470).

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Authors and Affiliations

  1. Department of Electrical Engineering, Incheon National Univerity, Incheon, Korea

    Dukju Ahn

  2. Samsung Electronics, Suwon, Korea

    Do-Hyeon Kim

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  1. Do-Hyeon Kim
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  2. Dukju Ahn
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Correspondence to Dukju Ahn.

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Kim, DH., Ahn, D. Optimization of Capacitive Wireless Power Transfer System for Maximum Efficiency. J. Electr. Eng. Technol. 15, 343–352 (2020). https://doi.org/10.1007/s42835-019-00327-2

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  • DOI: https://doi.org/10.1007/s42835-019-00327-2

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