Development of a switched-capacitor DC-DC converter with bidirectional power flow

Author

Chung, Henry S H ; Chow, W.C. ; Hui, S.Y.R. ; Lee, Stephen T S

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, China

Volume

47

Issue

9

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

1383

Lastpage

1389

Abstract

This brief presents a switched-capacitor dc-dc converter that offers features of voltage step-down, voltage step-up, and bidirectional power flow. Concept of energy transfer is achieved by using two current-controlled bidirectional converter cells, which operate in antiphase. Good regulation capability and continuous input current waveform are other substantial advantages that facilitate practical realization and reduce electromagnetic interference with other circuits and supply networks. State-space averaging technique is applied to study the static and dynamic characteristics. A 20-W, 5-V-9-V prototype has been built and has an overall efficiency of over 80% in all operations.

Keywords

DC-DC power convertors; electromagnetic interference; load flow; state-space methods; switched capacitor networks; 20 W; 5 to 9 V; 80 percent; bidirectional power flow; continuous input current waveform; current-controlled bidirectional converter cells; dynamic characteristics; electromagnetic interference; energy transfer; overall efficiency; regulation capability; state-space averaging technique; static characteristics; switched-capacitor DC-DC converter; voltage step-down; voltage step-up; Bidirectional power flow; Capacitors; Circuits; DC-DC power converters; Electromagnetic interference; Power conversion; Power semiconductor switches; Prototypes; Switching converters; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.883334

Filename

883334