Implementation of Series Equalization by Switching Capacitor for Hybrid Battery System

• Main Authors: Jian-zhong Huang, 黃建中
• Other Authors: Kuo-kai Shyu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/86820940395280126117

碩士 === 國立中央大學 === 電機工程研究所 === 99 === In this thesis, boost converter is used to combine high energy density batteries with high power density ones so that a simple, convenient and high efficiency hybrid battery system is introduced. The boost converter design applies K factor method to simplify calculating parameters in the feedback compensator. To increase efficiency, many load are designed with high voltage but low current; hence series connection of batteries are necessary to provide enough DC link voltage in battery systems. In traditional, series batteries are considered as a single one. But voltage differences exist between batteries, due to many times of charge and discharge. In order to equalize series batteries energy, switching capacitor equalizer is used in this paper. MOSFETs and capacitors are used to balance energy between batteries. Experimental results are finally given to show the effective use of the proposed systems as expected.