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

Yuanmao Ye and Ka Wai Eric Cheng
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Yuanmao Ye: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Ka Wai Eric Cheng: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Energies, 2016, vol. 9, issue 3, 1-15

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.

Keywords: voltage balancing; battery management system (BMS); switched-capacitor (SC); battery; energy storage system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (13)

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