A Caltech Library Service

A unified analysis of converters with resonant switches

Freeland, Steve and Middlebrook, R. D. (1987) A unified analysis of converters with resonant switches. In: 1987 IEEE Power Electronics Specialists Conference. IEEE , Piscataway, NJ, pp. 20-30.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Quasi-resonant converters are a recently introduced family of single-switch resonant converters featuring zero-current or zero-voltage switching. Recognition of the topological structure uniting these converters — and the PWM converters on which they are based — leads to general models of their dc and low-frequency ac behavior. An expression is derived that yields the dc conversion ratio of a quasi-resonant converter in terms of the well-known conversion ratio of the underlying PWM topology. A small-signal, low-frequency dynamic model is developed whose parameters also incorporate the PWM conversion ratio. The dc and ac models reveal that any quasi-resonant converter with a full-wave resonant switch has dc and low-frequency behavior identical to that of its PWM parent, with switching frequency control replacing duty ratio control. Converters with half-wave resonant switches act more like PWM converters under current programming or discontinuous conduction mode, exhibiting lossless damping in the small-signal model and output resistance at dc.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Additional Information:© 1987 IEEE. This work was conducted under the Power Electronics Program supported by grants from GTE Communication Systems Corp., Rockwell Inc., and EG&G Almond Instruments, Inc.
Funding AgencyGrant Number
GTE Communication Systems CorporationUNSPECIFIED
EG&C Almond InstrumentsUNSPECIFIED
Record Number:CaltechAUTHORS:20160411-162506133
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66063
Deposited On:12 Apr 2016 23:12
Last Modified:10 Nov 2021 23:52

Repository Staff Only: item control page