A New Self-Driven Active Clamp Forward Converter Using the Auxiliary Winding of Transformer

Abstract

A new self-driven active clamp forward converter, in which the extra driving circuit for the active clamp switch is not required, is proposed. In the proposed converter, the auxiliary winding is used instead of the extra driving circuit to drive the active clamp switch so that the converter has a simple structure comparing to the conventional one. The operation principles of the proposed converter, in which synchronous rectification is employed, are presented. Experimental results for the prototype converter of 100 W(5 V/20 A) are also presented to verify its validity.