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<p>With the development of distributed energy sources and microgrid systems, the research of high step-up DC-DC converters has gained increasingly attention. This paper proposes a novel high step-up DC-DC converter topology incorporating soft-switching resonant tank. Based on a Boost-Sepic structure, the converter can obtain a high voltage gain through boost cells consisting of a coupled inductor and an active switched-inductor. The resonance of the input circuit enables soft-switching of the power switch and the diodes, and the low reverse recovery time reduces the devices’ loss. The topology is simple and the drive signals are synchronized for convenient control of the converter. The comparative analysis shows that the proposed converter has higher voltage gain and lower voltage stress under the same conditions, and all semiconductor devices in the converter work under soft-switching conditions. In addition, the conditions of soft switching are derived in detail, and the converter's voltage gain, the voltage and current stresses on the power devices are calculated. Finally, to validate the effectiveness and feasibility of the proposed topology, a 400&#xa0;W prototype was built with a peak efficiency of nearly 97.2%. The output voltage reaches 445&#xa0;V at an input voltage of 24&#xa0;V.</p>

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Soft-Switching High Step-Up DC-DC Converter Based on Active Switched-Inductor Units

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Lele Qin,
  • Longyu Zhen,
  • Qianru Sun,
  • Shicheng Zheng,
  • Jinyu Li

摘要

With the development of distributed energy sources and microgrid systems, the research of high step-up DC-DC converters has gained increasingly attention. This paper proposes a novel high step-up DC-DC converter topology incorporating soft-switching resonant tank. Based on a Boost-Sepic structure, the converter can obtain a high voltage gain through boost cells consisting of a coupled inductor and an active switched-inductor. The resonance of the input circuit enables soft-switching of the power switch and the diodes, and the low reverse recovery time reduces the devices’ loss. The topology is simple and the drive signals are synchronized for convenient control of the converter. The comparative analysis shows that the proposed converter has higher voltage gain and lower voltage stress under the same conditions, and all semiconductor devices in the converter work under soft-switching conditions. In addition, the conditions of soft switching are derived in detail, and the converter's voltage gain, the voltage and current stresses on the power devices are calculated. Finally, to validate the effectiveness and feasibility of the proposed topology, a 400 W prototype was built with a peak efficiency of nearly 97.2%. The output voltage reaches 445 V at an input voltage of 24 V.