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<p>To address the low input voltage challenge in photovoltaic and fuel cell power supply systems, a novel dual-switch non-isolated high-step-up quadratic DC–DC converter is proposed in this paper. The converter enhances the conventional dual-switch cascaded boost structure by diverting the inductor branch current, effectively reducing current ripple. Furthermore, a switched capacitor-based clamping circuit is incorporated to alleviate the voltage stress on switching devices and suppress voltage spikes. A coupled inductor unit is also introduced to further enhance the voltage gain. Experimental results from a 100 W laboratory prototype demonstrate that the proposed converter achieves a high voltage gain, reduces voltage stress on the switches to below 40% of the output voltage, and maintains continuous input current, making it suitable for renewable energy applications.</p>

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Dual-switch non-isolated high-step-up quadratic DC/DC converter

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Jie Zhou,
  • Zhidong Qi,
  • Junsong Xu,
  • Zhaoyang Shen,
  • Youlin Qian

摘要

To address the low input voltage challenge in photovoltaic and fuel cell power supply systems, a novel dual-switch non-isolated high-step-up quadratic DC–DC converter is proposed in this paper. The converter enhances the conventional dual-switch cascaded boost structure by diverting the inductor branch current, effectively reducing current ripple. Furthermore, a switched capacitor-based clamping circuit is incorporated to alleviate the voltage stress on switching devices and suppress voltage spikes. A coupled inductor unit is also introduced to further enhance the voltage gain. Experimental results from a 100 W laboratory prototype demonstrate that the proposed converter achieves a high voltage gain, reduces voltage stress on the switches to below 40% of the output voltage, and maintains continuous input current, making it suitable for renewable energy applications.