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| Modular LCC resonant converter based on phase-shift voltage balancing control |
Hui SUN( ),Maoliang ZHANG,Yuchen FANG,Chenhao LIU,Shangjun HAN,Ruisong JI |
| College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract Aiming at the severe output voltage imbalance in modular LCC resonant converters caused by resonant parameter deviations among different modules, a large-signal model for LCC resonant converters was established using the dynamic phasor method. This model was extended to multi-module configurations, and a universal large-signal model for multi-module IPOS-LCC resonant converters under phase-shift control was proposed. On this basis, a phase-shift voltage balancing algorithm was designed to resolve the output voltage imbalance induced by resonant parameter variations and reduce the output voltage ripple through intra-module and inter-module phase-shift control. Experimental verification was performed on a three-module IPOS-LCC resonant converter prototype with 2 kV output. The results demonstrated that the phase-shift voltage balancing algorithm significantly reduced the voltage imbalance across the full output range while suppressing the overall output voltage ripple. Effective voltage equalization was realized during the startup transients of the experimental prototype, with improved input current balance among modules and enhanced system efficiency. The proposed algorithm effectively improves the output performance of modular LCC resonant converters.
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Received: 27 March 2025
Published: 23 May 2026
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| Fund: 国家重点研发计划“基础科研条件与重大科学仪器设备研发”资助项目(2023YFF0723700). |
基于移相均压控制的模块化LCC谐振变换器
针对模块化LCC谐振变换器中不同模块间谐振参数的偏差导致输出侧严重不均压的问题，利用动态相量法，对LCC谐振变换器进行大信号建模，并将其推广至多模块场景，提出用于移相控制下多模块IPOS-LCC谐振变换器的通用大信号模型. 在此基础上，设计移相均压算法，通过模块内与模块间的移相控制，解决由谐振参数偏差引发的输出侧不均压问题，并降低输出电压纹波. 搭建2 kV输出的三模块IPOS-LCC谐振变换器样机，对提出的移相均压算法进行实验验证. 结果表明，移相均压算法显著降低了实验样机在全输出范围内的电压不平衡度，并有效抑制了总输出电压纹波；在实验样机的启动动态过程中，其仍然能够实现良好的均压效果，使样机各模块的输入电流更加平衡，系统效率提升. 所提算法能够有效提高模块化LCC谐振变换器的输出性能.
关键词：
LCC谐振变换器,
模块化输入并联输出串联,
IPOS,
移相控制,
均压控制,
高压电源
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