Linear circuit models of PWM flyback and buck/boost converters

Dariusz Czarkowski, Marian K. Kazimierczuk

Research output: Contribution to journalArticle

Abstract

A method for modeling PWM converters operating in continuous conduction mode (CCM) is introduced. First, static voltage and current transfer functions of the idealized switching part of the converters are found. Second, the linearization of these transfer functions at the operating point is carried out, and the idealized switching part is replaced by dependent current and voltage sources. Third, the equivalent average resistance of parasitic resistances and equivalent average voltage of offset voltage sources of switches are determined using the principle of energy conservation. The method leads to linear DC and small-signal circuit models of a PWM converter. To illustrate the method, the analysis of the PWM flyback converter is given. Design equations for DC voltage transfer function, efficiency, and small-signal characteristics are derived.

Original languageEnglish (US)
Pages (from-to)688-693
Number of pages6
JournalIEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications
Volume39
Issue number8
DOIs
StatePublished - Aug 1992

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Pulse width modulation
Networks (circuits)
Electric potential
Transfer functions
Linearization
Energy conservation
Switches

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Linear circuit models of PWM flyback and buck/boost converters. / Czarkowski, Dariusz; Kazimierczuk, Marian K.

In: IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, Vol. 39, No. 8, 08.1992, p. 688-693.

Research output: Contribution to journalArticle

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