Abstract

A new push pull boost ac-dc or dc-dc single stage pulse width modulated (PWM) converter is proposed. The converter operates with zero voltage switching (ZVS), and continuous input current. It feature several merits such as single stage energy processing and good input current shaping. The converter topology also has zero turn-on loss even when used with hard switching. An auxiliary switch clamps the voltage across the full bridge to zero prior to the switching of the bridge switches. This switch operates for a small fraction of the period and turns on with zero current switching (ZCS) and turns off with ZVS. In this paper the operation of the converter is explained and preliminary results on a 800 W prototype are also presented.

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