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<p>The phase-shifted full-bridge converter is widely used in medium and high power scenarios due to its advantages of autonomous soft switching of its devices. However, the efficiency of the topology is reduced due to the failure of soft switching at light load, which makes it difficult to meet the high efficiency requirements of wide load range. To this end, this paper proposes a multi-mode control strategy: based on the principle of minimum loss, the phase shift control is adopted for heavy load, and the light load is switched to bipolar control, and the body diode loss is avoided by optimizing the synchronous rectification timing. Further, for light load conditions, the frequency reduction technology is introduced to suppress the bipolar control loss. Based on the verification of 360W experimental prototype, the efficiency of 15A load under phase shift control is 94.85%, and the efficiency of 1A load under bipolar control is 3.3% higher than that of fixed frequency. The experimental results verify the effectiveness of the theoretical analysis and control strategy.</p>

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Efficiency Optimization Study of Phase-Shifted Full-Bridge Converter Under Multi-Mode Control

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Gaili Yue,
  • Jialong Wang,
  • Jianghao Mao,
  • Ping Li,
  • Xiaolin Xu

摘要

The phase-shifted full-bridge converter is widely used in medium and high power scenarios due to its advantages of autonomous soft switching of its devices. However, the efficiency of the topology is reduced due to the failure of soft switching at light load, which makes it difficult to meet the high efficiency requirements of wide load range. To this end, this paper proposes a multi-mode control strategy: based on the principle of minimum loss, the phase shift control is adopted for heavy load, and the light load is switched to bipolar control, and the body diode loss is avoided by optimizing the synchronous rectification timing. Further, for light load conditions, the frequency reduction technology is introduced to suppress the bipolar control loss. Based on the verification of 360W experimental prototype, the efficiency of 15A load under phase shift control is 94.85%, and the efficiency of 1A load under bipolar control is 3.3% higher than that of fixed frequency. The experimental results verify the effectiveness of the theoretical analysis and control strategy.