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Energies 2016, 9(3), 138; doi:10.3390/en9030138

An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings

Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
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Author to whom correspondence should be addressed.
Academic Editor: Sheng S. Zhang
Received: 16 November 2015 / Revised: 17 February 2016 / Accepted: 18 February 2016 / Published: 27 February 2016
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Abstract

In this paper, a novel voltage equalizer is developed for series battery strings based on the two-phase switched capacitor technique. Different from the conventional voltage equalizers which are developed by switched-mode power converters, bulky magnetic components and complex monitoring and control system are avoided in the proposed system. Just a pair of complementary pulse signals with constant switching frequency and fixed duty ratio are required to control all of switches employed in the proposed voltage equalizer, and charge transfers from the higher voltage battery cells to lower voltage ones automatically. The circuit configuration and operation principle are provided in this paper. The model of the proposed voltage equalizer is also derived. Comparison with other works indicates that the proposed method is superior to the conventional switched-capacitor (SC) voltage equalizer for the high stack of series battery strings. Experimental results demonstrate that the proposed voltage equalization system is capable of excellent voltage balancing performance with a simple control method. View Full-Text
Keywords: voltage balancing; battery management system (BMS); switched-capacitor (SC); battery; energy storage system voltage balancing; battery management system (BMS); switched-capacitor (SC); battery; energy storage system
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ye, Y.; Cheng, K.W.E. An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings. Energies 2016, 9, 138.

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