Low-Frequency Selection Switch Based Cell-to-Cell Battery Voltage Equalizer With Reduced Switch Count

Dam, SK and John, V (2021) Low-Frequency Selection Switch Based Cell-to-Cell Battery Voltage Equalizer With Reduced Switch Count. In: IEEE Transactions on Industry Applications, 57 (4). pp. 3842-3851.

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Abstract

A selection switch based cell-to-cell voltage equalizer requires only one dual-port dc-dc converter shared by all the cells. A cell-to-cell voltage equalizer is proposed that utilizes a capacitively level-shifted Cuk converter and low-frequency cell selection switches. The absence of isolation transformer and diodes in the equalizer leads to high efficiency, and the use of low-frequency selection switches significantly reduces the cost of the drive circuits. A low-frequency cell selection network is proposed using bipolar voltage buses, where the switch count is almost half, compared to the existing low-frequency cell-to-cell equalizers for the case of a large number of cells. A novel approach for cell voltage recovery compensation is proposed, which reduces the number of operations of the selection switches and the equalization time. The proposed equalizer is implemented with relays and verified with an eight-cell Li-ion stack. The developed prototype shows the efficiency of over 90% and good voltage balancing performance during charging, discharging, and varying load conditions. Experimental results also show about one order of magnitude reduction in the number of relay switchings and a significant reduction in equalization time using the proposed voltage compensation.

Item Type:	Journal Article
Publication:	IEEE Transactions on Industry Applications
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Author.
Keywords:	cell balancing; Cell-to-cell; Cuk converter; double pole double throw (DPDT); low-frequency; selection switch; voltage equalizer
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	04 Aug 2023 05:23
Last Modified:	04 Aug 2023 05:23
URI:	https://eprints.iisc.ac.in/id/eprint/82823

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