An Optimal Design Methodology for LCL Resonant Converter by Considering Both Modulation Strategy and Circuit Parameters Based on Multiharmonic Frequency-Domain Model
发布时间：2026-07-07
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- 发布时间：
- 2026-07-07
- 论文名称：
- An Optimal Design Methodology for LCL Resonant Converter by Considering Both Modulation Strategy and Circuit Parameters Based on Multiharmonic Frequency-Domain Model
- 发表刊物：
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- 摘要：
- With the advantage of high efficiency and wide zero-voltage switching (ZVS) range, the inductor–capacitor–inductor (LCL) resonant converter has become a promising topology in bidirectional power flow scenarios. The commonly used modulation strategy is multiphase shift, among which triple phase shift (TPS) can reach the highest efficiency due to the most modulation degrees of freedom (DOFs). However, when adopting the TPS strategy, existing studies only design phase-shift angles elaborately without considering circuit parameter design, so there is still room for improvement of the converter efficiency. Therefore, this article proposes an optimal design methodology by considering both modulation strategy and circuit parameters. Accordingly, a universal dual-loop optimal design flowchart suitable for all types of bidirectional dcdc converters is presented. The circuit parameters are traversed in the outer loop. For each set of circuit parameters, the modulation DOFs are optimized in the inner loop. Therefore, the optimal circuit parameters and modulation DOFs can be obtained simultaneously. Additionally, a universal symmetrical transformation between forward and reverse power flows is proposed: the optimal phase-shift angles for forward and reverse power flows are opposite. Finally, a 900-W LCL converter prototype was built. The circuit parameters designed in this article can improve the peak efficiency by 2.20% compared to the circuit parameters in the existing literature, showing the superiority of the proposed design methodology.
- 第一作者：
- 曲圣
- 是否译文：
- 否