Abstract：In this paper, a combined LLC resonant converter with voltage and current auto- balance capability is presented. Based on multi-phase LLC converter connected in input-series output-parallel (ISOP) structure, this converter can realize input voltage balance among modules by adding flying capacitor in switching-capacitor network, and reach current balance by adding coupled inductor in resonant tanks of LLC modules. The proposed topology has excellent performance of classical LLC converter in high efficiency, soft switching, and low EMI. Moreover, it is easily controllable and high reliable, which is suitable for high step-down conversion and high power output applications. Taken the topology with two modules as an example, the operation principle of the proposed topology is analyzed in detail. Finally, a prototype converter with 400~550V input and 48V/24A output has been built and tested, to verify the effectiveness of the proposed voltage and current auto-balance capability.
郝瑞祥, 雷浩东, 贺涛, 游小杰. 一种具有自动均压均流特性的组合式LLC谐振变换器[J]. 电工技术学报, 2016, 31(20): 151-160.
Hao Ruixiang, Lei Haodong, He Tao, You Xiaojie. A Combined LLC Resonant Converter with Voltage and Current Auto-Balance Capability. Transactions of China Electrotechnical Society, 2016, 31(20): 151-160.
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2016, Vol. 31 
