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<p>This paper proposes a non-isolated input-parallel high-gain DC/DC converter with active switched and coupled inductors (NI-IP-ASL&amp;CI) for new energy generation systems. This converter uses coupled inductors (CI) and active switched inductors (A-SL) as the boost unit based on the boost-SEPIC structure, and further improves the voltage gain through controlling the interleaved conduction of the two switches. Note that the CI removes the requirement for high-voltage gains at extreme duty cycles. Besides, the energy of the leakage inductor is absorbed by the passive clamping circuit. Therefore, voltage spikes can be minimized. The two parallel switches of the input side are interleaved, decreasing switching stress and restricting ripple in the input current. Furthermore, the circuit theory, steady-state performance, converter parameter design, comparison with similar boost topologies, and small-signal modeling are given. Among them, the behavior of the system under small perturbations is clarified by small-signal modeling, which helps to analyze and design the converter for practical applications. Finally, an experimental prototype rated at 300 W is fabricated to demonstrate the correctness of the theoretical analysis.</p>

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Non-isolated input-parallel high-gain DC/DC converter with active switched and coupled inductors

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Qianru Sun,
  • Shicheng Zheng,
  • Xu Luo,
  • Jie Cheng,
  • Dengke Sun,
  • Jinyu Li

摘要

This paper proposes a non-isolated input-parallel high-gain DC/DC converter with active switched and coupled inductors (NI-IP-ASL&CI) for new energy generation systems. This converter uses coupled inductors (CI) and active switched inductors (A-SL) as the boost unit based on the boost-SEPIC structure, and further improves the voltage gain through controlling the interleaved conduction of the two switches. Note that the CI removes the requirement for high-voltage gains at extreme duty cycles. Besides, the energy of the leakage inductor is absorbed by the passive clamping circuit. Therefore, voltage spikes can be minimized. The two parallel switches of the input side are interleaved, decreasing switching stress and restricting ripple in the input current. Furthermore, the circuit theory, steady-state performance, converter parameter design, comparison with similar boost topologies, and small-signal modeling are given. Among them, the behavior of the system under small perturbations is clarified by small-signal modeling, which helps to analyze and design the converter for practical applications. Finally, an experimental prototype rated at 300 W is fabricated to demonstrate the correctness of the theoretical analysis.