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Capacitive Wireless Power Transfer with Multiple Transmitters: Efficiency Optimization

Author

Listed:
  • Ben Minnaert

    (Department of Industrial Science and Technology, Odisee University College of Applied Sciences, 9000 Ghent, Belgium)

  • Alessandra Costanzo

    (Department of Electrical, Electronic and Information Engineering Guglielmo Marconi, University of Bologna, 40126 Bologna, Italy)

  • Giuseppina Monti

    (Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy)

  • Mauro Mongiardo

    (Department of Engineering, University of Perugia, 06123 Perugia, Italy)

Abstract

Wireless power transfer with multiple transmitters can have several advantages, including more robustness against misalignment and extending the mobility and range of the receiver(s). In this work, the efficiency maximization problem is analytically solved for a capacitive wireless power transfer system with multiple coupled transmitters and a single receiver. It is found that the system efficiency can be increased by adding more transmitters. Moreover, it is proven that the cross-coupling between the transmitters can be eliminated by adding shunt susceptances at the input ports. Optimal values for the input currents and receiver load are determined to achieve maximum efficiency. As well the optimal load, the optimal input currents and the maximum efficiency are independent on the cross-coupling. By impedance-matching the internal conductances of the generators, the maximum-efficiency solution also becomes the one that provides the maximum output power. Finally, by expressing each transmitter–receiver link with its kQ-product, the maximum system efficiency can be calculated. The analytical results are verified by circuital simulation.

Suggested Citation

  • Ben Minnaert & Alessandra Costanzo & Giuseppina Monti & Mauro Mongiardo, 2020. "Capacitive Wireless Power Transfer with Multiple Transmitters: Efficiency Optimization," Energies, MDPI, vol. 13(13), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3482-:d:380811
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    References listed on IDEAS

    as
    1. Ben Minnaert & Nobby Stevens, 2017. "Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers," Energies, MDPI, vol. 10(9), pages 1-16, September.
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    Cited by:

    1. Suziana Ahmad & Reiji Hattori & Aam Muharam, 2021. "Generalized Circuit Model of Shielded Capacitive Power Transfer," Energies, MDPI, vol. 14(10), pages 1-19, May.
    2. Bo Dong & Yang Chen & Jing Lian & Xiaohui Qu, 2022. "A Novel Compensation Circuit for Capacitive Power Transfer System to Realize Desired Constant Current and Constant Voltage Output," Energies, MDPI, vol. 15(4), pages 1-18, February.
    3. You-Chen Weng & Chih-Chiang Wu & Edward Yi Chang & Wei-Hua Chieng, 2021. "Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor," Energies, MDPI, vol. 14(8), pages 1-16, April.

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