A Current Balance Method Based on Phase-Shift Control Between Modules in Three-Phase Half-Bridge LLC Converter
Shi Lin, Liu Bangyin, Duan Shanxu
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：The multi-phase LLC converter has the problem of unbalanced phase current due to the tolerance of resonant parameters of each phase. A current balance control strategy is proposed for three-phase half-bridge LLC converter. Based on the method of phase shift modulation between modules and the structure of three phase midpoint floating LLC converter, the proposed strategy can regulate the amplitude and phase of the midpoint voltage to realize three-phase current sharing. The influence of phase shift angle between modules to the midpoint voltage is analyzed and the control strategy for three-phase current sharing is proposed accordingly. The relationship between the current balance control loop and the actual phase shift angle is derived. The experimental results verify the correctness and effectiveness of the proposed strategy.
石林, 刘邦银, 段善旭. 一种基于模块间移相的三相半桥LLC变换器均流控制策略[J]. 电工技术学报, 2019, 34(21): 4551-4558.
Shi Lin, Liu Bangyin, Duan Shanxu. A Current Balance Method Based on Phase-Shift Control Between Modules in Three-Phase Half-Bridge LLC Converter. Transactions of China Electrotechnical Society, 2019, 34(21): 4551-4558.
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2019, Vol. 34 
