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<p>The LLC converter has difficulty achieving both a wide gain and high efficiency under a wide input voltage range. Although multi-resonant topologies have been proposed to extend the gain and improve efficiency, most existing solutions rely on single-transformer configurations, which suffer from a high peak flux density, concentrated device stress, and unbalanced current and thermal distributions. To address these issues, a dual-transformer multi-resonant DC-DC converter (DT-LLCCL) is proposed in this paper. The converter employs a dual-transformer structure with a shared primary half-bridge, which effectively alleviates voltage and current stress while enhancing power balance. A notch filter is integrated into the resonant tank to enable third-harmonic power transfer, thereby reducing the reactive current and improving efficiency. Moreover, the converter achieves zero-voltage switching for all of the switches over the entire input voltage range, effectively reducing switching losses and enhancing the overall performance. The impedance characteristics and operation principle of the converter are thoroughly analyzed, and a complete parameter design method is presented in this paper. Finally, an experimental prototype rated at 600&#xa0;W with an input range of 200–400&#xa0;V and a 48&#xa0;V output is designed, and the peak efficiency is 95.2%. The experimental results confirm the validity of the theoretical analysis and the effectiveness of the design method.</p>

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Analysis and design of dual-transformer multi-resonant DC-DC converter with wide input voltage range

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Peng Mao,
  • Zechun Zhu,
  • Hongyun Jia

摘要

The LLC converter has difficulty achieving both a wide gain and high efficiency under a wide input voltage range. Although multi-resonant topologies have been proposed to extend the gain and improve efficiency, most existing solutions rely on single-transformer configurations, which suffer from a high peak flux density, concentrated device stress, and unbalanced current and thermal distributions. To address these issues, a dual-transformer multi-resonant DC-DC converter (DT-LLCCL) is proposed in this paper. The converter employs a dual-transformer structure with a shared primary half-bridge, which effectively alleviates voltage and current stress while enhancing power balance. A notch filter is integrated into the resonant tank to enable third-harmonic power transfer, thereby reducing the reactive current and improving efficiency. Moreover, the converter achieves zero-voltage switching for all of the switches over the entire input voltage range, effectively reducing switching losses and enhancing the overall performance. The impedance characteristics and operation principle of the converter are thoroughly analyzed, and a complete parameter design method is presented in this paper. Finally, an experimental prototype rated at 600 W with an input range of 200–400 V and a 48 V output is designed, and the peak efficiency is 95.2%. The experimental results confirm the validity of the theoretical analysis and the effectiveness of the design method.