Selective buck-boost equalizer for series battery packs

Author

Tang, Ming ; Stuart, Thomas

Author_Institution

Delphi Delco Electron. Co., Kokomo, IN, USA

Volume

36

Issue

1

fYear

2000

fDate

1/1/2000 12:00:00 AM

Firstpage

201

Lastpage

211

Abstract

To maximize the capacity and reliability of a series connected battery pack, a new selective equalizer developed from the earlier ramp equalizer is proposed. A set of bipolar junction transistors (BJTs) controlled by a microcontroller is used to route equalization current to the lowest voltage batteries. Since only the lowest voltage batteries are connected to the equalizer, the need for uniform transformer leakage inductance is avoided, and a lower power level can be used since no excess current flows to the other batteries. An equalization experiment has shown that a 37 W selective equalizer had a slightly better effect on a 24-battery pack than a 63 W ramp equalizer

Keywords

DC-DC power convertors; battery chargers; secondary cells; voltage control; 37 W; bipolar junction transistors; equalization current; isolated DC-DC converter; lowest voltage batteries; microcontroller controlled; selective buck-boost equalizer; selective switch module; series battery packs; switch controller; useful energy; Batteries; Circuit testing; Computer science; Electrodes; Equalizers; Hybrid electric vehicles; Inductance; Low voltage; Microcontrollers; Voltage control;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.826322

Filename

826322