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

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.

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Cite this article

[IEEE Style]

W. Xie, H. Chen, K. Liu, W. Xi, Z. Zhang, X. Zhu, M. Jiang, "AC circuit model of GaN‑based multiphase synchronous buck converters with dead‑time for cascade system," Journal of Power Electronics, vol. 26, no. 2, pp. 255-267, 2026. DOI: 10.1007/s43236-025-01074-6.

[ACM Style]

Wenhao Xie, Haoran Chen, Kang Liu, Wenjie Xi, Zhengjiang Zhang, Xiangou Zhu, and Min Jiang. 2026. AC circuit model of GaN‑based multiphase synchronous buck converters with dead‑time for cascade system. Journal of Power Electronics, 26, 2, (2026), 255-267. DOI: 10.1007/s43236-025-01074-6.