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The four-switch Buck-Boost converter (FSBB) offers advantages such as buck-boost func-tionality, consistent input/output polarity, and low device stress. This paper proposes a soft-switching control strategy based on quadrilateral inductor current modulation. By optimiz-ing the switching frequency and the duration of each control stage (T1–T4), zero-voltage switching (ZVS) is achieved across the full input voltage and load range, significantly re-ducing conduction losses. Simulation and experimental results demonstrate that the pro-posed strategy improves efficiency by 0.81% compared to traditional soft-constraint control methods, ensuring stable dynamic performance while realizing ZVS.

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FSBB Soft-Switching Control Strategy and its Application in Wide Input Scenarios

  • 会议论文

  • 发表日期：

    2026年

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  • Jiarui Wang,
  • Zhaolong Sun,
  • Baolong Liu,
  • Feng Liu

摘要

The four-switch Buck-Boost converter (FSBB) offers advantages such as buck-boost func-tionality, consistent input/output polarity, and low device stress. This paper proposes a soft-switching control strategy based on quadrilateral inductor current modulation. By optimiz-ing the switching frequency and the duration of each control stage (T1–T4), zero-voltage switching (ZVS) is achieved across the full input voltage and load range, significantly re-ducing conduction losses. Simulation and experimental results demonstrate that the pro-posed strategy improves efficiency by 0.81% compared to traditional soft-constraint control methods, ensuring stable dynamic performance while realizing ZVS.