标题：A Modularization Method for Battery Equalizers Using Multiwinding Transformers
作者：Shang, Yunlong; Xia, Bing; Zhang, Chenghui; Cui, Naxin; Yang, Jufeng; Mi, Chris
作者机构：[Shang, Yunlong; Zhang, Chenghui; Cui, Naxin] Shandong Univ, Sch Control Sci & Engn, Jinan 250061, Shandong, Peoples R China.; [Shang, Yunlong; Xia, 更多
通讯作者地址：[Mi, C]San Diego State Univ, Dept Elect & Comp Engn, San Diego, CA 92182 USA.
来源：IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
关键词：Electric vehicles (EVs); forward conversion; flyback conversion;; lithium-ion batteries; multi-winding transformers; modularized; equalizers
摘要：This paper proposes a modularized global architecture using multi-winding transformers for battery cell balancing. The global balancing for a series-connected battery string is achieved based on forward conversion in each battery module and based on flyback conversion among modules. The demagnetization of the multiwinding transformers is also simultaneously achieved by the flyback conversion among modules without the need of additional demagnetizing circuits. Moreover, all MOSFET switches are driven by two complementary pulse width modulation signals without the requirement of cell voltage sensors, and energy can be automatically and simultaneously delivered from any high voltage cells to any low voltage cells. Compared with existing equalizers requiring additional balancing circuits for battery modules, the proposed modularized equalizer shares one circuit for the balancing among cells and modules. The balancing performance of the proposed equalizer is perfectly verified through experimental results, and the maximum balancing efficiency is up to 91.3%. In summary, the proposed modularized equalizer has the advantages of easier modularization, simpler control, higher efficiency, smaller size, and lower cost, ensuring the battery system higher reliability and easier implementation.