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<p>This paper proposes a novel bidirectional composite structure multimode converter with multiplexing components. The topology integrates push–pull, full-bridge, and flyback configurations through structural innovation, where the inherent inductance of the flyback transformer is utilized to establish an LC resonant network. Through intelligent mode combination control, the converter achieves three distinct voltage gain modes (high, medium, and low), significantly extending the voltage regulation range while enhancing the power density. The fixed-frequency control strategy simplifies the system implementation while maintaining soft-switching characteristics. The converter realizes zero-current switching (ZCS) turn-on across the full load range to minimize the switching losses, with an optimized flyback operation mode for enhancing efficiency in low-gain and low-power scenarios. The operation principles, gain characteristics, and parameter optimization methodology are analyzed. Experimental validation is conducted on a 500 W prototype with a 40–90&#xa0;V low-voltage port and a 400&#xa0;V high-voltage port, and the theoretical advantages are verified.</p>

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Bidirectional composite structure multimode converter with multiplexing components

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Yisheng Yuan,
  • Jiayi Liu,
  • Wei Liu

摘要

This paper proposes a novel bidirectional composite structure multimode converter with multiplexing components. The topology integrates push–pull, full-bridge, and flyback configurations through structural innovation, where the inherent inductance of the flyback transformer is utilized to establish an LC resonant network. Through intelligent mode combination control, the converter achieves three distinct voltage gain modes (high, medium, and low), significantly extending the voltage regulation range while enhancing the power density. The fixed-frequency control strategy simplifies the system implementation while maintaining soft-switching characteristics. The converter realizes zero-current switching (ZCS) turn-on across the full load range to minimize the switching losses, with an optimized flyback operation mode for enhancing efficiency in low-gain and low-power scenarios. The operation principles, gain characteristics, and parameter optimization methodology are analyzed. Experimental validation is conducted on a 500 W prototype with a 40–90 V low-voltage port and a 400 V high-voltage port, and the theoretical advantages are verified.