Four switch ZVS DC to DC converter

A new four switch full-bridge dc-dc converter is well suited for power converter operating from high input voltage. It imposes only half of the input voltage across each of the four switches. This topology reduces turn-off switching losses by providing capacitive snubbing and eliminates capacitor-discharge turn-on losses by providing zero-voltage turn-on. Switching losses are important in converters operating at high input voltage because turn-on losses are proportional to the square of the input voltage and turn-off losses are proportional to the input voltage. Switching losses of the devices and the rectifier diodes can be reduced by the addition of an external commutating inductor and two clamp diodes to the full-bridge converter. This topology is suitable for resonant and non-resonant converters.