A novel voltage equalizer using series/parallel switching capacitors

Author

Iwasawa, Keisuke ; Inoue, Tomoshige ; Koizumi, Hirotaka

Author_Institution

Tokyo Univ. of Sci., Tokyo, Japan

fYear

2010

fDate

6-9 Dec. 2010

Firstpage

1

Lastpage

6

Abstract

Electric Double Layer Capacitor (EDLC) is used as an electric energy storage device because it has large capacity. In the energy storage system composed of series-connected EDLCs, each cell has a different voltage because of the individual characteristic and of repeating charge and discharge. This difference of voltages deteriorates the performance of the whole storage system. In this paper, a novel voltage equalizer for series-connected EDLCs is proposed. By the circuit state which transfers the charge without EDLC, and by determining appropriate duty rate, the proposed circuit is able to equalize cell voltages faster than the conventional equalizer using Cockcroft/Walton circuit. The operation is analyzed with MATLAB/Simulink simulation.

Keywords

equalisers; supercapacitors; switching convertors; Cockcroft-Walton circuit; MATLAB-Simulink simulation; cell voltage; charge transfers; electric double layer capacitor; electric energy storage device; series-connected EDLC; series-parallel switching capacitors; voltage equalizer; Capacitors; Discharges; Energy storage; Equalizers; Integrated circuit modeling; Switches; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Sustainable Energy Technologies (ICSET), 2010 IEEE International Conference on

Conference_Location

Kandy

Print_ISBN

978-1-4244-7192-8

Type

conf

DOI

10.1109/ICSET.2010.5684933

Filename

5684933