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A CPT system with switchable compensation for constant current or voltage output against load and coupling capacitance variations

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Abstract

This paper proposes a novel capacitive power transfer (CPT) system with switchable compensation for achieving constant current (CC) or constant voltage (CV) output against load and coupling capacitance variations. Meanwhile, a parameter design method is proposed to ensure a low input impedance angle at constant operation modes. Mathematical models of voltage and current gains are established, which are used to analyze the CC and CV operation modes of the proposed CPT system. Two relays are adopted in receiver to reconfigure the compensation network to switch the CC mode and CV mode. The communication between the transmitter and receiver is not needed, and complex control is not required either for changing two operation modes. An experimental setup with 2A output current in CC mode and 96 V output voltage in CV mode is constructed. Experimental results show that the maximum variation of the output current is 4.0% in CC mode, and the maximum variation of the output voltage is 5.0% in CV mode, when the load resistance and coupling capacitance vary from 24 to 72 ohms, and 500 to 1000 pF, respectively. Experimental results verify the CC/CV output and the effectiveness of the proposed parameter design method.

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Acknowledgements

Authors of this paper gratefully acknowledge the support of China National Center for International Research on Wireless Power Transfer Technology.

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Authors and Affiliations

  1. Key Laboratory of Complex System Safety and Control, Ministry of Education, Chongqing, China

    Yugang Su

  2. College of Automation, Chongqing University, Shazheng Street No.174, Chongqing, China

    Xiaodong Qing, Yugang Su, Zhe Liu & Xinyu Hou

  3. Department of Electrical and Computer Engineering, University of Auckland, Auckland, New Zealand

    Aiguo Patrick Hu

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  1. Xiaodong Qing
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  2. Yugang Su
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  3. Aiguo Patrick Hu
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  4. Zhe Liu
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  5. Xinyu Hou
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Correspondence to Yugang Su.

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Qing, X., Su, Y., Hu, A.P. et al. A CPT system with switchable compensation for constant current or voltage output against load and coupling capacitance variations. Electr Eng 103, 2391–2402 (2021). https://doi.org/10.1007/s00202-021-01235-3

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  • DOI: https://doi.org/10.1007/s00202-021-01235-3

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