Analysis and experimentation of a forward converter with active clamping and output rectifier using a center tapped transformer

This paper proposes a study of a forward DC/DC power converter topology where the isolating transformer has its core reset by active voltage clamping, using a capacitor and an additional switch. This technique makes feasible the soft commutation of the two switches, allowing an increase of the commutation frequency and a volume reduction of the inductors involved. The operating principle and the small-signal characterization of the converter are presented, making it possible to foresee the clamping circuit effect in the dynamic response. Experimental results of a 550 W prototype are also presented.

[1]  N. Mohan,et al.  Asymmetrical duty cycle permits zero switching loss in PWM circuits with no conduction loss penalty , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[2]  Ramesh Oruganti,et al.  Family of two-switch soft-switched asymmetrical PWM DC/DC converters , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[3]  S. Birca-Galateanu,et al.  Small-signal characterization of the forward-flyback converters with active clamp , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.

[4]  Ivo Barbi,et al.  A new family of ZVS-PWM active-clamping DC-to-DC boost converters: analysis, design, and experimentation , 1997 .