DocumentCode :
1229972
Title :
Generalized structure of bi-directional switched-capacitor DC/DC converters
Author :
Chung, Henry Shu-Hung ; Ioinovici, Adrian ; Cheung, Wai-Leung
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, China
Volume :
50
Issue :
6
fYear :
2003
fDate :
6/1/2003 12:00:00 AM
Firstpage :
743
Lastpage :
753
Abstract :
This paper presents a generalized circuit structure of bi-directional switched-capacitor dc/dc converters that feature voltage step-down, voltage step-up, and bi-directional power flow. The starting point is the derivation of two structures of single-capacitor bi-directional converter cells. Current control scheme is applied in the capacitor-charging phase, resulting in a near-constant capacitor charging current and low electromagnetic interference. A converter string is then formulated by cascading a number of converter cells, in order to meet the input and output voltage requirements and conversion efficiency. By paralleling two similar strings and operating them in the anti phase, the overall converter input current becomes continuous. A reduced-order modeling and state-space averaging technique are used to study the static and dynamic behavior of the converter. The theoretical conversion efficiency in the step-down and step-up mode, respectively, is investigated for different voltage-conversion ratios and numbers of stages. The performance of the proposed structure is experimentally verified on a 5-V/12-V prototype.
Keywords :
DC-DC power convertors; reduced order systems; state-space methods; switched capacitor networks; 12 V; 5 V; bi-directional switched-capacitor DC/DC converter; capacitor charging; circuit structure; conversion efficiency; current control; electromagnetic interference; power electronics; reduced-order model; state-space averaging; step-down mode; step-up mode; Bidirectional control; Capacitors; Current control; DC-DC power converters; Electromagnetic interference; Load flow; Power conversion; Power semiconductor switches; Switching circuits; Voltage;
fLanguage :
English
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7122
Type :
jour
DOI :
10.1109/TCSI.2003.812615
Filename :
1208615
Link To Document :
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