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Research on Smooth Mode Transition Strategy for Four-switch Buck-Boost Converter Based on Graphical Method
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Hongbin WANG1, Aobo CHEN1, Yuntao XUE1, Youpeng OUYANG2, Yuhang HE3, Wu CHEN  Senior Member, CPSS4
Journal of Power Supply | 2025, 23(4) : 53 - 62
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Journal of Power Supply | 2025, 23(4): 53-62
• DC-DC Converters •
Research on Smooth Mode Transition Strategy for Four-switch Buck-Boost Converter Based on Graphical Method
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Hongbin WANG1, Aobo CHEN1, Yuntao XUE1, Youpeng OUYANG2, Yuhang HE3, Wu CHEN  Senior Member, CPSS4
Affiliations
  • 1.Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
  • 2.Nanjing Nari Jibao Electric Co., Ltd., Nanjing 211102, China
  • 3.Monolithic Power Systems, Inc., Hangzhou 310012, China
  • 4.Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing 210096, China
Published: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.53
Outline
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The four-switch Buck-Boost converter applied to a fuel cell system can theoretically achieve a higher efficiency under the traditional two-mode control. However, in fact, the dynamic performance of the system is poor due to the influence of a voltage gain blind zone in the process of transition between the two modes, which greatly reduces the operation stability of the converter. In high-power applications with large current, the interleaving technology is usually used to reduce the inductor current ripple and increase the power density of the converter. Therefore, the smooth mode transition of a four-phase interleaved four-switch Buck-Boost converter is taken as a control objective. First, the topology of the converter is introduced, and its basic mathematical relationship is obtained. Then, the reason for the voltage gain blind zone of the converter is analyzed using a graphical method, and a control strategy is proposed to eliminate the blind zone and realize the smooth mode transition based on the traditional three-mode control strategy. In the dynamic process, the changes in duty cycle are minimized and the inductor ripple current is also optimized, which improves the efficiency and stability of the converter. Finally, the effectiveness of the proposed control strategy was verified by experimental results.

Four-switch Buck-Boost converter  /  smooth mode transition  /  graphical method  /  multi-mode control
王红斌, 陈奥博, 薛云涛, 欧阳有鹏, 贺宇航, 陈武中国电源学会高级会员. 基于图形化方法的四开关Buck-Boost变换器模式平滑切换策略研究. 电源学报, 2025 , 23 (4) : 53 -62 . DOI: 10.13234/j.issn.2095-2805.2025.4.53
Hongbin WANG, Aobo CHEN, Yuntao XUE, Youpeng OUYANG, Yuhang HE, Wu CHEN. Research on Smooth Mode Transition Strategy for Four-switch Buck-Boost Converter Based on Graphical Method[J]. Journal of Power Supply, 2025 , 23 (4) : 53 -62 . DOI: 10.13234/j.issn.2095-2805.2025.4.53
Appendix
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Year 2025 volume 23 Issue 4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.4.53
  • Receive Date：2022-10-11
  • Online Date：2026-10-26
  • Published：2025-07-30
Article Data
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History
  • Received：2022-10-11
  • Revised：2022-12-12
  • Accepted：2023-01-19
Affiliations
    1.Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
    2.Nanjing Nari Jibao Electric Co., Ltd., Nanjing 211102, China
    3.Monolithic Power Systems, Inc., Hangzhou 310012, China
    4.Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing 210096, China
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