Analysis of abnormal phenomena caused by synchronous rectifiers in a paralleled converter system

Author

Kohama, Teruhiko ; Ninomiya, Tamotsu ; Shoyama, Masahito ; Tymerski, Richard

Author_Institution

Dept. of Electr. Eng., Fukuoka Univ., Japan

Volume

15

Issue

4

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

670

Lastpage

680

Abstract

Problems of synchronous rectification in a parallel-module DC-DC power converter system are described. These include excessive power dissipation due to the bidirectional current flow capability of MOSFETs and abnormal oscillation due to the cross coupling of the MOSFETs used as synchronous rectifiers. The abnormal oscillation, which causes excessive voltage stress, is analyzed; the results of which are subsequently confirmed by experiment. Methods for solving the abnormal oscillation problem are discussed

Keywords

AC-DC power convertors; DC-DC power convertors; circuit oscillations; power MOSFET; power semiconductor switches; rectifying circuits; semiconductor device models; switching circuits; abnormal oscillation; abnormal phenomena analysis; bidirectional current flow capability; cross coupling; excessive power dissipation; parallel-module DC-DC power converter system; paralleled converter system; power MOSFETs; synchronous rectifiers; Diodes; Equivalent circuits; Multichip modules; Power dissipation; Power system reliability; Pulse width modulation; Rectifiers; Stress; Switches; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.849037

Filename

849037