Title :
Small-signal models of quasi-resonant converters
Author :
Costa, J. M F Dores ; Silva, M. Medeiros
Author_Institution :
INESC, Lisbon, Portugal
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;
Conference_Titel :
Industrial Electronics, 1997. ISIE '97., Proceedings of the IEEE International Symposium on
Conference_Location :
Guimaraes
Print_ISBN :
0-7803-3936-3
DOI :
10.1109/ISIE.1997.648946
