DocumentCode
1502650
Title
Parallel-mode extended-period quasiresonant convertor
Author
Cheng, K.W.E. ; Evans, P.D.
Author_Institution
Sch. of Electron. & Electr. Eng., Birmingham Univ., UK
Volume
138
Issue
5
fYear
1991
fDate
9/1/1991 12:00:00 AM
Firstpage
243
Lastpage
251
Abstract
A new circuit, a parallel-mode extended-period, zero-current quasiresonant convertor (PM-EP-ZCQRC), is introduced. It has low switching losses, because the switching conditions are those of a quasiresonant convertor, but it operates at constant frequency by using the duty-ratio technique of conventional switched-mode power supplies for output regulation. The modes of operation of the circuit are described and analysed. The results of open-loop tests on a prototype circuit are presented and are shown to agree with predictions. The efficiency of the circuit was found to be 80 to 90% and a comparison of loss components with those in a quasiresonant convertor (QRC) is given
Keywords
power convertors; 80 to 90 percent; duty-ratio technique; extended-period quasiresonant convertor; low switching losses; open-loop tests; operation modes; parallel-mode;
fLanguage
English
Journal_Title
Electric Power Applications, IEE Proceedings B
Publisher
iet
ISSN
0143-7038
Type
jour
Filename
92933
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