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Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation

Author

Listed:
  • Zhiqin Zhao

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Xiaoqiong He

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
    National Rail Transit Electrification and Automation Engineering Technique Research Center, Southwest Jiaotong University, Chengdu 611756, China)

Abstract

In this paper, a new auxiliary power supply system of magnetic levitation based on the LLC DC-DC converter is proposed. The switches of the DC-DC converter are SiC MOSFET, which enables high frequency, high temperature, and high power density. For further improving the efficiency of the system and realizing the stability of the output voltage under different load conditions, the digital synchronous rectification (DSR) based on the phase shift control strategy is proposed. The prototype of the LLC DC-DC converter based on SiC MOSFET is implemented, which can realize zero voltage switching (ZVS) and zero current switching (ZCS). Then, the thermal image of DSR is presented, which proves that the power loss of SiC MOSFET with DSR is relatively low. Additionally, the system efficiency among the Si IGBT, SiC MOSFET, and SiC MOSFET with DSR is analyzed and the prototype demonstrates 98% peak efficiency. Finally, simulations, experiments, and data analysis prove the superiority of the proposed DSR strategy for the new auxiliary power supply system of magnetic levitation.

Suggested Citation

  • Zhiqin Zhao & Xiaoqiong He, 2019. "Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation," Energies, MDPI, vol. 13(1), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:13:y:2019:i:1:p:51-:d:300282
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    References listed on IDEAS

    as
    1. Zhijian Fang & Junhua Wang & Shanxu Duan & Liangle Xiao & Guozheng Hu & Qisheng Liu, 2018. "Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model," Energies, MDPI, vol. 11(3), pages 1-14, March.
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    Cited by:

    1. Dakang Yuan & Yiming Zhang & Xuhong Wang, 2021. "An Improved Analytical Model for Crosstalk of SiC MOSFET in a Bridge-Arm Configuration," Energies, MDPI, vol. 14(3), pages 1-30, January.

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