Mode-varying Cell Equalizer Based on Interleaved Parallel Multiple Transformers  

作　　者：Qixing Wu Mingyu Gao Huipin Lin 

机构地区：[1]School of Electronic Information,Hangzhou Dianzi University,Hangzhou 310018,China [2]Zhejiang Institute of Mechanical and Electrical Engineering,Hangzhou 310053,China

出　　处：《CSEE Journal of Power and Energy Systems》2023年第2期802-823,共22页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported in main part by the General Project of National Natural Science Foundation of China under Grant 61671194;in part by the General Scientific Research Projects of Zhejiang Education Department under Grant Y201840464.

摘　　要：In the application of long series batteries,there is always the phenomenon that multiple cells in a pack are unbalanced simultaneously.In view of this situation,a modevarying cell equalizer topology based on interleaved parallel multiple transformers is proposed in this paper.Every unit in this equalizer can freely switch between LLC resonance mode and 3-state LC quasi-resonance mode.The boosting effect of LLC structure is used to reduce the number of transformer’s total turns.When multiple equalizer units need to work in LLC mode simultaneously,interleaved parallel technology is used to limit secondary side equalization current ripple for long-term protection of battery life.A prototype was designed and built to validate the effect of a closed loop LLC mode control algorithm with a state-of-charge(SOC)based equalization scheme selection strategy.Experimental results including up to 88.52%efficiency in LLC mode with 90.7%efficiency in 3-state LC mode,and minute level balancing time show the proposed topology demonstrates excellent balancing performance.

关 键 词：3-state LC quasi-resonance mode interleaved parallel LLC resonance mode mode-varying ZVZCS band 

分 类 号：TM40[电气工程—电器]