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A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems

Author

Listed:
  • Il-Oun Lee

    (Department of Electrical Engineering, Myongji University, Yongin 17058, Korea)

  • Joongheon Kim

    (School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Woojoo Lee

    (Department of Electronic Engineering, Myongji University, Yongin 17058, Korea)

Abstract

Growth of the Internet of Things (IoT) spurs need for new ways of delivering power. Wireless power transfer (WPT) has come into the spotlight from both academia and industry as a promising way to power the IoT devices. As one of the well-known WPT techniques, the capacitive power transfer (CPT) has the merit of low electromagnetic radiation and amenability of combined power and data transfer over a capacitive interface. However, applying the CPT to the IoT devices is still challenging in reality. One of the major issues is due to the small capacitance of the capacitive interface, which results in low efficiency of the power transfer. To tackle this problem, we present a new step-up single-switch quasi-resonant (SSQR) converter for the CPT system. To enhance the CPT efficiency, the proposed converter is designed to operate at low frequency and drive small current into the capacitive interfaces. In addition, by eliminating resistor-capacitor-diode (RCD) snubber in the converter, we reduce the implementation cost of the CPT system. Based on intensive experimental work with a CPT system prototype that supports maximum 50 W (100 V/0.5 A) power transfer, we demonstrate the functional correctness of the converter that achieves up to 93% efficiency.

Suggested Citation

  • Il-Oun Lee & Joongheon Kim & Woojoo Lee, 2017. "A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems," Energies, MDPI, vol. 10(9), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:9:p:1437-:d:112303
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    References listed on IDEAS

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    1. Aqeel Mahmood Jawad & Rosdiadee Nordin & Sadik Kamel Gharghan & Haider Mahmood Jawad & Mahamod Ismail, 2017. "Opportunities and Challenges for Near-Field Wireless Power Transfer: A Review," Energies, MDPI, vol. 10(7), pages 1-28, July.
    2. Ben Minnaert & Nobby Stevens, 2017. "Conjugate Image Theory Applied on Capacitive Wireless Power Transfer," Energies, MDPI, vol. 10(1), pages 1-15, January.
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    Cited by:

    1. Fei Lu & Hua Zhang & Chris Mi, 2017. "A Review on the Recent Development of Capacitive Wireless Power Transfer Technology," Energies, MDPI, vol. 10(11), pages 1-30, November.
    2. Enrico Bottaro & Santi Agatino Rizzo & Nunzio Salerno, 2022. "Circuit Models of Power MOSFETs Leading the Way of GaN HEMT Modelling—A Review," Energies, MDPI, vol. 15(9), pages 1-32, May.

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