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<p>Dead-time can be optimized to achieve soft-switching and efficiency improvement for GaN-based converters, but the effect of dead-time on the dynamic model remains unclear. An AC circuit model is developed to simplify the modeling of conventional state-space averaging for GaN-based synchronous buck converters with dead-time incorporated. An investigation is conducted to quantify the effect of dead-time on the converter dynamic performance. The impact of dead-time on stability is analyzed via impedance modeling of the cascaded circuits. Due to the advantage of clarity, the proposed AC circuit model is promising for multiphase high-order converters. The proposed model shows an 8.85% increase in the accuracy of the dynamic input current under a step source voltage. A single-phase and three-phase prototypes are built to verify the accuracy of the proposed AC circuit model.</p>

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AC circuit model of GaN-based multiphase synchronous buck converters with dead-time for cascade system

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Wenhao Xie,
  • Haoran Chen,
  • Kang Liu,
  • Wenjie Xi,
  • Zhengjiang Zhang,
  • Xiangou Zhu,
  • Min Jiang

摘要

Dead-time can be optimized to achieve soft-switching and efficiency improvement for GaN-based converters, but the effect of dead-time on the dynamic model remains unclear. An AC circuit model is developed to simplify the modeling of conventional state-space averaging for GaN-based synchronous buck converters with dead-time incorporated. An investigation is conducted to quantify the effect of dead-time on the converter dynamic performance. The impact of dead-time on stability is analyzed via impedance modeling of the cascaded circuits. Due to the advantage of clarity, the proposed AC circuit model is promising for multiphase high-order converters. The proposed model shows an 8.85% increase in the accuracy of the dynamic input current under a step source voltage. A single-phase and three-phase prototypes are built to verify the accuracy of the proposed AC circuit model.