Equalizing charger based on multi‑windings transformer and voltage‑doubler rectifiers

Chao Wu; Hong-kai Zhang; Shan-shou Li; Zheng-fei Li; Jia-rong Kan

Equalizing charger based on multi‑windings transformer and voltage‑doubler rectifiers

Vol. 22, No. 2, pp. 297-307, Feb. 2022

10.1007/s43236-021-00348-z

Charger

Voltage equalizer

Constant current and constant voltage charging

Equivalent Circuit

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.

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Cite this article

[IEEE Style]

C. Wu, H. Zhang, S. Li, Z. Li, J. Kan, "Equalizing charger based on multi‑windings transformer and voltage‑doubler rectifiers," Journal of Power Electronics, vol. 22, no. 2, pp. 297-307, 2022. DOI: 10.1007/s43236-021-00348-z.

[ACM Style]

Chao Wu, Hong-kai Zhang, Shan-shou Li, Zheng-fei Li, and Jia-rong Kan. 2022. Equalizing charger based on multi‑windings transformer and voltage‑doubler rectifiers. Journal of Power Electronics, 22, 2, (2022), 297-307. DOI: 10.1007/s43236-021-00348-z.