Control circuit and method for controlling resonant converter, and power inverter including resonant converter and control circuit

摘要

The present invention begins with an initial state (500) in which the diagonal pair is conducting during each half cycle of the plurality of periods of the resonant current of the resonant converter, and the first of the diagonal pair based on the voltage control signal. The switch member is turned off (510), and after the first switch member is turned off, the switch member connected in series to the first switch member is turned on before the resonance current zero crossing E5 (520). After the turn-off of one switch member, the second switch member of the diagonal pair is turned off before the zero crossing E5 (530), and after the turn-off of the second switch member, it is connected in series with the second switch member. A control circuit and method for controlling a resonant converter with a full-bridge configuration is proposed to turn on (540) the switched switch member prior to the resonant current zero crossing event.