A Two-Phase Resonant Switched-Capacitor Converters Using PCB Trace Integration

Longyang Yu,Shenglei Zhao, Xiufeng Song,Tao Zhang, Wei Mu,Yue Hao,Jincheng Zhang

IEEE Journal of Emerging and Selected Topics in Power Electronics（2025）

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Abstract

The resonant switched-capacitor converters have been demonstrated to avoid capacitor current spike and achieve soft switching, to have high reliability and high efficiency. However, the power density is reduced due to the presence of discrete resonant inductors. To address the issue, this work presents an integration method of resonant inductors for the two-phase resonant switched-capacitor converters by using PCB copper traces. The proposed integration method is based on the direct coupling theory, in which the PCB trace coupling of two resonant switched-capacitor converters in phase can reduce the PCB trace length and copper loss. More importantly, the core loss of discrete inductors can be eliminated. This proposed method can not only improve the light-load efficiency and power density, but also reduce the cost of the discrete inductors. Two 240W GaN-based experiment prototypes based on discrete inductors and proposed integrated PCB trace inductors are tested and compared to validate the effectiveness of the proposed integration method. Experimental results demonstrate that the prototype with PCB trace inductors can achieve higher light-load efficiency and power density.

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Key words

Resonant switched-capacitor converters,PCB trace integration,GaN devices,resonant inductors

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【要点】：本文提出了一种利用PCB铜迹线集成谐振电感的两相谐振开关电容器转换器，以提高轻载效率和功率密度，并降低成本。

【方法】：通过直接耦合理论，将两个相谐振开关电容器转换器的PCB铜迹线进行耦合，以减少PCB铜迹线长度和铜损，消除离散电感的铁损。

【实验】：制作了基于离散电感和提出集成PCB铜迹线电感的两个240W GaN基实验原型，并进行测试比较，结果表明采用PCB铜迹线电感的原型具有更高的轻载效率和功率密度。