PWM CONVERTER WITH LOW STRESSES AND ZERO CAPACITIVE TURN-ON LOSSES

A buck converter operating at constant switching frequency, whose acti ve switches and recovery diode commutate at zero-voltage-switching (ZV S), with zero capacitive turn-on losses, is proposed, By using the par asitic capacitances of the switches as resonant capacitors, multireson ance is created. The resonant stage takes place only after the resonan t inductor has been discharged, thus avoiding a resonant current peak; the devices are subjected to the same stresses as their counterparts in conventional hard-switching converters. A high efficiency is obtain ed.