빠른 전하 균일화를 위한 새로운 구조의 셀 밸런싱 회로

Title
빠른 전하 균일화를 위한 새로운 구조의 셀 밸런싱 회로
Other Titles
A Novel Cell Balancing Circuit for Fast Charge Equalization
Author
김래영
Keywords
Lithium-ion battery; SOC; State of Charge; Balancing current; Symmetrical multi-winding transformer
Issue Date
2015-04
Publisher
전력전자학회
Citation
전력전자학회 논문지, v. 20, NO 2, Page. 160-166
Abstract
This study proposes an improved cell balancing circuit for fast equalization among lithium-ion (Li-ion) batteries. A simple voltage sensorless charge balancing circuit has been proposed in the past [1]. This cell balancing circuit automatically transfers energy from high-to low-voltage battery cells. However, the circuit requires a switch with low on-resistance because the balancing speed is limited by the on-resistance of the switch. Balancing speed decreases as the voltage difference among the battery cells decrease. In this study, the balancing speed of the cell balancing circuit is enhanced by using the auxiliary circuit, which boosts the balancing current. The charging current is determined by the nominal battery cell voltage and thus, the balancing speed is almost constant despite the very small voltage differences among the batteries. Simulation results are provided to verify the validity of the proposed cell balancing circuit.
URI
http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=JRJJC3_2015_v20n2_160http://hdl.handle.net/20.500.11754/24080
ISSN
1229-2214; 2288-6281
DOI
10.6113/TKPE.2015.20.2.160
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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