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Energies 2017, 10(7), 1011; doi:10.3390/en10071011

A Novel Layered Bidirectional Equalizer Based on a Buck-Boost Converter for Series-Connected Battery Strings

1
New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
2
College of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
3
Guangdong Key Laboratory of Clean Energy Technology, School of Electric Power, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 9 July 2017 / Accepted: 11 July 2017 / Published: 17 July 2017
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Abstract

To eliminate the influence of the inconsistency on the cycle life and the available capacity of battery packs, and improve the balancing speed, a novel inductor-based layered bidirectional equalizer (IBLBE) is proposed. The equalizer is composed of two layers of balancing circuits connected in parallel. Each layer contains multiple balancing sub-circuits based on buck-boost converters. These balancing sub-circuits can equalize the corresponding cells simultaneously, and allow the dynamic adjustment of equalization path and equalization threshold. Analysis and simulation results demonstrate the IBLBE has a higher level balancing speed than other equalizers based on switched-capacitor or switched-inductor converters, and reduces the balancing time by 30% compared to existing inductor-based parallel architecture equalizers (PAEs). Experimental results are presented to validate the analysis and effectiveness of the proposed equalizer. View Full-Text
Keywords: battery string; layered bidirectional equalizer; buck-boost converter; balancing speed battery string; layered bidirectional equalizer; buck-boost converter; balancing speed
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Wang, S.; Kang, L.; Guo, X.; Wang, Z.; Liu, M. A Novel Layered Bidirectional Equalizer Based on a Buck-Boost Converter for Series-Connected Battery Strings. Energies 2017, 10, 1011.

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