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Optimal Asymmetric Duty Modulation for Dual Active Bridge Converters with DC Blocking Capacitors

Author

Listed:
  • Peng Dai

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Shuyu Liu

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Shiqi Fang

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Zheng Gong

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Aiming at the optimization of current stress with low voltage ratio and full ZVS, a control method combining variable duty cycle and phase shift was proposed based on dual active bridge (DAB) converters with DC blocking capacitors. By adding DC bias to the DC blocking capacitors, asymmetric duty modulation (ADM) can adjust the bias as needed. Based on the theoretical analysis of steady-state operation, the operating modes can be divided into eight modes. According to the features of each mode, equivalent circuits are established. The transmission power and the boundary of zero-voltage-switching (ZVS) are deduced through a detailed analysis of each mode. Based on the theoretical deduction, ADM is more suitable for a low voltage ratio. Verified by experiment, optimized asymmetric duty modulation (OADM) can increase efficiency by 3.58%, 6.57%, 8.81%, and 10.33% compared with DPS when P is equal to 0.36 and m is equal to 0.4, 0.3, 0.2, and 0.1, respectively. Using this method, the current stress of the converter is lighter than that under regular modulation when the voltage ratio m ≤ 0.5 with full ZVS.

Suggested Citation

  • Peng Dai & Shuyu Liu & Shiqi Fang & Zheng Gong, 2023. "Optimal Asymmetric Duty Modulation for Dual Active Bridge Converters with DC Blocking Capacitors," Energies, MDPI, vol. 16(18), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6674-:d:1242156
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    Cited by:

    1. Hyung-Jun Byun & Jung-Min Park & Junsin Yi & Chung-Yuen Won, 2023. "Zero-Voltage-Switching Analysis Model of the Triple-Active-Bridge Converter," Energies, MDPI, vol. 16(23), pages 1-22, November.

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