ZERO CURRENT SWITCHING QUASI-RESONANT CONVERTERS INTRODUCTION RESONANT CONVERTERS There are many ways to classify the resonant converters. In short, the Quasi-resonant converter only resonates for a portion of a operation cycle. For the load-resonant converter, the resonance occurs for the whole operation cycle. Also the load is part of the resonant circuit which is to make the circuit become an R-L-C resonance. The resonant transition converter only resonates during the switching transition. It will return to the conventional switched mode afterwards. The types of the quasi- resonant converters are zero voltage, zero current and multi- resonant switching converters. ZERO-CURRENT SWITCHING CONFIGURATION Figure a shows the general topology. And fig. b is a half-wave with the current through the switch being one-directional and
ZERO CURRENT SWITCHING QUASI-RESONANT CONVERTERSINTRODUCTION
RESONANT CONVERTERSThere are many ways to classify the resonant
converters. In short, the Quasi-resonant converter only resonates
for a portion of a operation cycle. For the load-resonant
converter, the resonance occurs for the whole operation cycle. Also
the load is part of the resonant circuit which is to make the
circuit become an R-L-C resonance. The resonant transition
converter only resonates during the switching transition. It will
return to the conventional switched mode afterwards. The types of
the quasi-resonant converters are zero voltage, zero current and
multi-resonant switching converters.ZERO-CURRENT SWITCHING
CONFIGURATIONFigure a shows the general topology. And fig. b is a
half-wave with the current through the switch being one-directional
and fig.c is a full-wave switch in which the current through the
switch is bi-directional. Lr and Cr are resonant components.
Resonant switch structureZERO CURRENT SWITCHING QUASI-RESONANT
(ZCS QR) BUCK CONVERTER
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