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<p>To address the efficiency degradation issue of dual active bridge (DAB) converters under mismatched input and output voltages, this paper proposes a dual-variable asymmetric modulation (DVAM) strategy. First, the Karush–Kuhn–Tucker (KKT) condition is utilized in the time domain to solve for the peak-to-peak inductor current, resulting in the global optimization solution. Then, based on the optimization results, a simplified duty optimization (SDO) scheme is proposed, which eliminates the traditional approach of calculating duty cycles through power, thereby simplifying the computation process. Finally, a SiC-based experimental prototype is constructed to validate the proposed DVAM. The result demonstrates that the proposed DVAM effectively reduces losses by expanding the zero voltage switching (ZVS) range and lowering the root mean square (rms) current, thereby enhancing efficiency, with particularly significant improvements under light-load conditions.</p>

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Dual-variable asymmetric modulation with a simplified duty optimization scheme for DAB converters to improve efficiency

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Longfei Guan,
  • Jingchen Pan,
  • Hao Li,
  • Chonghui Song,
  • Zhengkuo Jiao,
  • Xianrui Sun,
  • Ruiwang Sun,
  • Xudong Wang,
  • Yunlong Qiu

摘要

To address the efficiency degradation issue of dual active bridge (DAB) converters under mismatched input and output voltages, this paper proposes a dual-variable asymmetric modulation (DVAM) strategy. First, the Karush–Kuhn–Tucker (KKT) condition is utilized in the time domain to solve for the peak-to-peak inductor current, resulting in the global optimization solution. Then, based on the optimization results, a simplified duty optimization (SDO) scheme is proposed, which eliminates the traditional approach of calculating duty cycles through power, thereby simplifying the computation process. Finally, a SiC-based experimental prototype is constructed to validate the proposed DVAM. The result demonstrates that the proposed DVAM effectively reduces losses by expanding the zero voltage switching (ZVS) range and lowering the root mean square (rms) current, thereby enhancing efficiency, with particularly significant improvements under light-load conditions.