Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Equalizing charger based on multi-windings transformer and voltage-doubler rectifiers

  • Wu, Chao (School of Electronics and Information Engineering, Anhui Jianzhu University) ;
  • Zhang, Hong-kai (School of Electronics and Information Engineering, Anhui Jianzhu University) ;
  • Li, Shan-shou (School of Electronics and Information Engineering, Anhui Jianzhu University) ;
  • Li, Zheng-fei (College of Electrical Engineering, Yancheng Institute of Technology) ;
  • Kan, Jia-rong (College of Electrical Engineering, Yancheng Institute of Technology)
  • Received : 2021.04.23
  • Accepted : 2021.11.17
  • Published : 2022.02.20
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Abstract

Energy storage batteries are currently composed of a large number of low-voltage battery cells. The state of charge of the cells is different due to the characteristic differences between cells. This causes some of the cells to be over-charged during charging and some of the cells to be over-discharging during discharging. To improve this phenomenon, this paper proposes a battery charger with an equalizing function that works during the charging and discharging processes. A performance comparison among the proposed charger and other similar topologies is carried out. The operational principle of the proposed strategy is analyzed and a control strategy with only a single voltage loop is proposed, which can guarantee two-stage charging. Experimental results show that the proposed charger can simultaneously achieve a high efficiency and the requirement of voltage equalization between cells.

Keywords

Acknowledgement

This article was funded by the "Qinglan Project" in Jiangsu Province, Jiangsu Province Fifth "333 Project" Research Project, and Six Talent Peaks Project in Jiangsu Province under Grant XNY-045. Thanks!

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