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<p>To address the key technical bottlenecks of conventional forward–flyback converters, such as increased complexity and cost due to extra resonant components for soft switching, and the unclear influence of multi-winding transformer parameters on power transfer and soft-switching performance, this paper proposes an improved dual-switch four-winding topology based on quasi-resonant operation. By analyzing the power-transfer mechanisms in different operating modes, the critical magnetizing inductance for quasi-resonant operation and the critical turns ratio under different resonant triggering conditions are derived, and the influence of the turns ratio on efficiency is revealed. Based on these results, a design method for the transformer turns ratio and magnetizing inductance is established. A 288&#xa0;W prototype is built, achieving an efficiency above 90% (peak 93.5%) under the tested conditions, and the measured waveforms agree well with the theoretical analysis, providing practical design guidance for quasi-resonant operation.</p>

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Design and analysis of quasi-resonant dual-switch four-winding forward-flyback transformer

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Hongyun Jia,
  • Wei Hu,
  • Yu Song,
  • Peng Mao,
  • Zhan Shen

摘要

To address the key technical bottlenecks of conventional forward–flyback converters, such as increased complexity and cost due to extra resonant components for soft switching, and the unclear influence of multi-winding transformer parameters on power transfer and soft-switching performance, this paper proposes an improved dual-switch four-winding topology based on quasi-resonant operation. By analyzing the power-transfer mechanisms in different operating modes, the critical magnetizing inductance for quasi-resonant operation and the critical turns ratio under different resonant triggering conditions are derived, and the influence of the turns ratio on efficiency is revealed. Based on these results, a design method for the transformer turns ratio and magnetizing inductance is established. A 288 W prototype is built, achieving an efficiency above 90% (peak 93.5%) under the tested conditions, and the measured waveforms agree well with the theoretical analysis, providing practical design guidance for quasi-resonant operation.