Small-signal models of quasi-resonant converters

Author

Costa, J. M F Dores ; Silva, M. Medeiros

Author_Institution

INESC, Lisbon, Portugal

Volume

2

fYear

1997

fDate

7-11 Jul 1997

Firstpage

258

Abstract

Small-signal models of quasi-resonant (QR) power converters are obtained by using state-space averaging. The control-to-output transfer function and the audio susceptibility are easily obtained from these models. The frequency response derived from the theoretical model of a buck QR power converter with zero-voltage-switching (ZVS) is compared with experimental results. A good agreement is obtained, but the authors find that it is indispensable to include in the theoretical model the resistances due to the losses in the inductor and in the output capacitor

Keywords

PWM power convertors; frequency response; resonant power convertors; state-space methods; switching circuits; transfer functions; audio susceptibility; buck power converter; control-to-output transfer function; frequency response; inductor; losses; output capacitor; quasi-resonant power converters; resistances; small-signal models; state-space averaging; theoretical model; zero voltage switching; Capacitors; Inductors; Pulse width modulation; Pulse width modulation converters; Resonance; Switches; Switching converters; Switching frequency; Zero current switching; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 1997. ISIE '97., Proceedings of the IEEE International Symposium on

Conference_Location

Guimaraes

Print_ISBN

0-7803-3936-3

Type

conf

DOI

10.1109/ISIE.1997.648946

Filename

648946