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Zero Voltage Switching Condition in Class-E Inverter for Capacitive Wireless Power Transfer Applications

Author

Listed:
  • Fabio Corti

    (Department of Information Engineering, DINFO, Università degli Studi di Firenze, 50129 Florence, Italy)

  • Alberto Reatti

    (Department of Information Engineering, DINFO, Università degli Studi di Firenze, 50129 Florence, Italy)

  • Ya-Hui Wu

    (Department of Electrical and Computer Engineering, NYU Tandon School of Engineering, New York, NY 11201, USA)

  • Dariusz Czarkowski

    (Department of Electrical and Computer Engineering, NYU Tandon School of Engineering, New York, NY 11201, USA)

  • Salvatore Musumeci

    (Energy Department, PEIC, Politecnico di Torino, 10129 Torino, Italy)

Abstract

This paper presents a complete design methodology of a Class-E inverter for capacitive wireless power transfer (CWPT) applications, focusing on the capacitance coupling influence. The CWPT has been investigated in this paper, because most of the literature refers to inductive power transfer (IWPT). However, CWPT in perspective can result in lower cost and higher reliability than IWPT, because it does not need coils and related shields. The Class-E inverter has been selected, because it is a single switch inverter with a grounded MOSFET source terminal, and this leads to low costs and a simple control strategy. The presented design procedure ensures both zero voltage switching (ZVS) and zero derivative switching (ZDS) conditions at an optimum coupling coefficient, thus enabling a high transmission and conversion efficiency. The novelties of the proposed method are that the output power is boosted higher than in previous papers available in the literature, the inverter is operated at a high conversion efficiency, and the equivalent impedance of the capacitive wireless power transfer circuit to operate in resonance is exploited. The power and the efficiency have been increased by operating the inverter at 100 kHz so that turn-off losses, as well as losses in inductor and capacitors, are reduced. The closed-form expressions for all the Class-E inverter voltage and currents waveforms are derived, and this allows for the understanding of the effects of the coupling coefficient variations on ZVS and ZDS conditions. The analytical estimations are validated through several LTSpice simulations and experimental results. The converter circuit, used for the proposed analysis, has been designed and simulated, and a laboratory prototype has been experimentally tested. The experimental prototype can transfer 83.5 W at optimal capacitive coupling with operating at 100 kHz featuring 92.5% of the efficiency, confirming that theoretical and simulation results are in good agreement with the experimental tests.

Suggested Citation

  • Fabio Corti & Alberto Reatti & Ya-Hui Wu & Dariusz Czarkowski & Salvatore Musumeci, 2021. "Zero Voltage Switching Condition in Class-E Inverter for Capacitive Wireless Power Transfer Applications," Energies, MDPI, vol. 14(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:911-:d:496428
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    References listed on IDEAS

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    1. Marojahan Tampubolon & Laskar Pamungkas & Huang-Jen Chiu & Yu-Chen Liu & Yao-Ching Hsieh, 2018. "Dynamic Wireless Power Transfer for Logistic Robots," Energies, MDPI, vol. 11(3), pages 1-13, February.
    2. Yang Liu & Bin Li & Mo Huang & Zhijian Chen & Xiuyin Zhang, 2018. "An Overview of Regulation Topologies in Resonant Wireless Power Transfer Systems for Consumer Electronics or Bio-Implants," Energies, MDPI, vol. 11(7), pages 1-22, July.
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    Cited by:

    1. Kamil Bryś & Beniamin Oskar Grabarek & Piotr Król & Rafał Staszkiewicz & Magdalena Wierzbik-Strońska & Tomasz Król, 2022. "The Thermal Influence of an Electromagnetic Field with a Radio Frequency Depending on the Type of Electrode Used," IJERPH, MDPI, vol. 19(18), pages 1-17, September.
    2. Suziana Ahmad & Aam Muharam & Reiji Hattori & Anyu Uezu & Tarek M. Mostafa, 2021. "Shielded Capacitive Power Transfer (S-CPT) without Secondary Side Inductors," Energies, MDPI, vol. 14(15), pages 1-17, July.
    3. Suziana Ahmad & Reiji Hattori & Aam Muharam, 2021. "Generalized Circuit Model of Shielded Capacitive Power Transfer," Energies, MDPI, vol. 14(10), pages 1-19, May.
    4. Salvatore Musumeci, 2023. "Energy Conversion Using Electronic Power Converters: Technologies and Applications," Energies, MDPI, vol. 16(8), pages 1-9, April.
    5. 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.
    6. Amjad, Muhammad & Farooq-i-Azam, Muhammad & Ni, Qiang & Dong, Mianxiong & Ansari, Ejaz Ahmad, 2022. "Wireless charging systems for electric vehicles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).

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