Switching-ripple-based current sharing for paralleled power converters

Author

Perreault, David J. ; Sato, Kenji ; Selders, Robert L., Jr. ; Kassakian, John G.

Author_Institution

Lab. for Electromagn. & Electron. Syst., MIT, Cambridge, MA, USA

Volume

46

Issue

10

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

1264

Lastpage

1274

Abstract

This paper presents the implementation and experimental evaluation of a new current-sharing technique for paralleled power converters. This technique uses information naturally encoded in the switching ripple to achieve current sharing and requires no intercell connections for communicating this information. Practical implementation of the approach is addressed and an experimental evaluation, based on a three-cell prototype system, is also presented. It is shown that accurate and stable load sharing is obtained over a wide load range. Finally, an alternate implementation of this current-sharing technique is described and evaluated

Keywords

DC-DC power convertors; frequency estimation; switching circuits; uninterruptible power supplies; buck converter cells; cellular converter architecture; control design; frequency estimation; naturally encoded information; paralleled power converters; stable load sharing; switching-ripple-based current sharing; three-cell prototype system; wide load range; Centralized control; Control systems; Distributed control; Integrated circuit interconnections; Maintenance; Power system reliability; Prototypes; Stress control; 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

10.1109/81.795839

Filename

795839