Modeling and Analysis of Series-Parallel Switched-Capacitor Voltage Equalizer for Battery/Supercapacitor Strings

• Published in: IEEE journal of emerging and selected topics in power electronics Vol. 3; no. 4; pp. 977 - 983
• Main Authors: Yuanmao Ye, Cheng, Ka Wai E.
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-12-2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; battery management system; Capacitors; Equalizers; Mathematical model; switched-capacitor; Switches; Voltage equalization; switched-capacitor (SC); model; Battery-management system; voltage equalization
• ISSN: 2168-6777; 2168-6785
• DOI: 10.1109/JESTPE.2015.2418339

A series-parallel switched-capacitor (SC) power converter is reconfigured as a new voltage equalization circuitry for series-connected batteries or supercapacitors in this paper. The model of the new voltage equalizer is derived and successfully used to analyze the equalization speed and the energy loss. It is a very useful tool to analyze and design the SC-based equalization systems to meet different balancing speed requirements. The analysis and modeling methods can be extended to other SC-based voltage-balancing systems. A prototype is built and the experimental results are provided to confirm the theoretical analysis and the modeling method.