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At present, the mainstream control strategy for four switch buck boost converters is PCCM control strategy, which can effectively improve power density and efficiency. PCCM is divided into two working modes, PDCM and PCRM, which have the problem of uneven mode switching. This paper studies the relationship between output power and control variable T2 in both PDCM and PCRM operating modes. At the junction of PDCM and PCRM, the dPo/dT2 is solved to obtain the parameter kc that can smoothly switch the FSBB converter between the two modes. In addition, the relationship between kc and input voltage and output voltage is analyzed. Finally, a hardware experimental platform was built, and the feasibility of the proposed scheme was verified through an FSBB converter with an input voltage of 210–330 V, an output voltage of 270 V, and an output power of 4 kW.

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Smooth Switching of Four-Switch Buck-Boost Work Mode

  • 会议论文

  • 发表日期：

    2025年

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  • Siyuan Gao,
  • Fanghua Zhang

摘要

At present, the mainstream control strategy for four switch buck boost converters is PCCM control strategy, which can effectively improve power density and efficiency. PCCM is divided into two working modes, PDCM and PCRM, which have the problem of uneven mode switching. This paper studies the relationship between output power and control variable T2 in both PDCM and PCRM operating modes. At the junction of PDCM and PCRM, the dPo/dT2 is solved to obtain the parameter kc that can smoothly switch the FSBB converter between the two modes. In addition, the relationship between kc and input voltage and output voltage is analyzed. Finally, a hardware experimental platform was built, and the feasibility of the proposed scheme was verified through an FSBB converter with an input voltage of 210–330 V, an output voltage of 270 V, and an output power of 4 kW.