Parallel-mode extended-period quasiresonant convertor

Ka Wai Eric Cheng; P. D. Evans

doi:10.1049/ip-b.1991.0029

Parallel-mode extended-period quasiresonant convertor

Ka Wai Eric Cheng, P. D. Evans

Research output: Journal article publication › Journal article › Academic research › peer-review

43 Citations (Scopus)

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 dutyratio 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.

Original language	English
Pages (from-to)	243-251
Number of pages	9
Journal	IEE Proceedings B: Electric Power Applications
Volume	138
Issue number	5
DOIs	https://doi.org/10.1049/ip-b.1991.0029
Publication status	Published - 1 Jan 1991
Externally published	Yes

Keywords

Convertors
Power electronics
Resonant convertors
Switched-mode power supplies

ASJC Scopus subject areas

Engineering(all)

More information

10.1049/ip-b.1991.0029

Cite this

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AU - Evans, P. D.

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AB - 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 dutyratio 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.

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JF - IEE Proceedings B: Electric Power Applications

IS - 5

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Parallel-mode extended-period quasiresonant convertor

Abstract

Keywords

ASJC Scopus subject areas

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