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Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System

Author

Listed:
  • Longzhao Sun

    (Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Houjun Tang

    (Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Yingyi Zhang

    (Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract

Conditions for load-independent output voltage or current in two-coil wireless power transfer (WPT) systems have been studied. However, analysis of load-independent output current in three-coil WPT system is still lacking in previous studies. This paper investigates the output current characteristics of a three-coil WPT system against load variations, and determines the operating frequency to achieve a constant output current. First, a three-coil WPT system is modeled by circuit theory, and the analytical expression of the root-mean-square of the output current is derived. By substituting the coupling coefficients, the quality factor, and the resonant frequency of each coil, we propose a method of calculating the frequency for load-independent output current in a three-coil WPT system, which indicates that there are two frequencies that can achieve load-independent output current. Experiments are conducted to validate these analytical results.

Suggested Citation

  • Longzhao Sun & Houjun Tang & Yingyi Zhang, 2015. "Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System," Energies, MDPI, vol. 8(9), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:9:p:9719-9730:d:55443
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    References listed on IDEAS

    as
    1. Vijith Vijayakumaran Nair & Jun Rim Choi, 2015. "An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants," Energies, MDPI, vol. 8(6), pages 1-21, June.
    2. Giovanni Puccetti & Ugo Reggiani & Leonardo Sandrolini, 2013. "Experimental Analysis of Wireless Power Transmission with Spiral Resonators," Energies, MDPI, vol. 6(11), pages 1-10, November.
    3. Xuezhe Wei & Zhenshi Wang & Haifeng Dai, 2014. "A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances," Energies, MDPI, vol. 7(7), pages 1-26, July.
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    Cited by:

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    2. Zhenshi Wang & Xuezhe Wei & Haifeng Dai, 2015. "Design and Control of a 3 kW Wireless Power Transfer System for Electric Vehicles," Energies, MDPI, vol. 9(1), pages 1-18, December.
    3. Cheng Jiang & Yue Sun & Zhihui Wang & Chunsen Tang, 2018. "Multi-Load Mode Analysis for Electric Vehicle Wireless Supply System," Energies, MDPI, vol. 11(8), pages 1-11, July.
    4. Jin Zhang & Chonghu Cheng, 2016. "Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission," Energies, MDPI, vol. 9(4), pages 1-20, April.
    5. Chaoqiang Jiang & K.T. Chau & Chunhua Liu & Wei Han, 2017. "Wireless DC Motor Drives with Selectability and Controllability," Energies, MDPI, vol. 10(1), pages 1-15, January.

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