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Reducing Circling Currents in a VHF Class Φ 2 Inverter Based on a Fully Analytical Loss Model

Author

Listed:
  • Desheng Zhang

    (School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Run Min

    (School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Zhigang Liu

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

  • Qiaoling Tong

    (School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Qiao Zhang

    (School of Automation, Wuhan University of Technology, Wuhan 430070, China)

  • Ting Wu

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

  • Ming Zhang

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

  • Aosong Zhou

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

Abstract

This paper proposes a fully analytical loss model to reduce circling currents and improve the power efficiency of a class Φ 2 inverter. Firstly, analytical expression of the switching node voltage is derived by analyzing its harmonic components. Based on the result, the power switch is modeled as a voltage source, where the circuit is simplified to a linear network and analytical expressions of branch currents are solved. Secondly, root mean square (RMS) values of branch currents and component losses are calculated to form the analytical loss model for a Φ 2 inverter. The influence of circuit parameters on the circling current and power efficiency are thoroughly analyzed, which derives optimal design constraints to reduce circling currents of a class Φ 2 inverter. Furthermore, detailed design guidance and equations are provided to calculate circuit parameters of a class Φ 2 inverter, which reduces its circling currents and improves overall power efficiency. Finally, a class Φ 2 inverter prototype is built, and experimental results demonstrate a 7% efficiency improvement compared to conventional empirical design methods.

Suggested Citation

  • Desheng Zhang & Run Min & Zhigang Liu & Qiaoling Tong & Qiao Zhang & Ting Wu & Ming Zhang & Aosong Zhou, 2022. "Reducing Circling Currents in a VHF Class Φ 2 Inverter Based on a Fully Analytical Loss Model," Energies, MDPI, vol. 15(22), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8572-:d:974382
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    References listed on IDEAS

    as
    1. Yichen Zhang & Junye Ma & Xian Tang, 2021. "A CMOS Active Rectifier with Efficiency-Improving and Digitally Adaptive Delay Compensation for Wireless Power Transfer Systems," Energies, MDPI, vol. 14(23), pages 1-15, December.
    2. Ching-Yao Liu & Guo-Bin Wang & Chih-Chiang Wu & Edward Yi Chang & Stone Cheng & Wei-Hua Chieng, 2021. "Derivation of the Resonance Mechanism for Wireless Power Transfer Using Class-E Amplifier," Energies, MDPI, vol. 14(3), pages 1-22, January.
    3. Yi Zhang & Yue Feng & Sheng Liu & Jiande Wu & Xiangning He, 2021. "Impedance Matching Method for 6.78 MHz Class-E2-Based WPT System," Energies, MDPI, vol. 14(14), pages 1-15, July.
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