Averaged modeling of PWM converters operating in discontinuous conduction mode

Jian Sun, Daniel M. Mitchell, Matthew F. Greuel, Philip T. Krein, Richard M. Bass

Research output: Contribution to journalArticle

Abstract

Various aspects of averaged modeling of hard-switching pulse-width modulated (PWM) converters operating in the discontinuous conduction mode (DCM) are studied. A more streamlined modeling procedure is proposed which serves as a general framework for comparing different models. A duty ratio constraint that defines the diode conduction interval is identified to be the key to accurate prediction of high-frequency behavior. A new duty-ratio constraint is proposed that leads to full-order averaged models of DCM converters. Numerical analyses and experimental measurements confirm that the new models correctly predict the small-signal responses up to one third of the switching frequency and are more accurate than all previous models. Moreover, new analytical results are included to show the origin of the high-frequency pole in DCM operation and to explain why the full-order model is capable of accurately predicting it. Averaged circuit counterparts of the new models are developed in the form of averaged switch models to facilitate circuit simulation.

Original languageEnglish (US)
Pages (from-to)482-492
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume16
Issue number4
DOIs
StatePublished - Jul 1 2001

Keywords

  • Averaged modeling
  • Averaged switch model
  • Discontinuous conduction mode
  • PWM converters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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