A hybrid-driven active clamp forward converter based on LM5027

This paper proposed a hybrid-driven synchronous rectification method based on LM5027, a power-managing controller, which is mainly used in the rectification circuit of the active clamp forward converter. Due to this novel method, not only the body diodes conduction dissipation is decreased, but also the reverse current from the load side is avoided on condition of starting up with pre-bias load. In this paper, operating principle of current commutation periods between two synchronous rectifiers and pre-bias start-up are discussed in detail. In order to verify the theoretical analysis and prediction above, an active clamp forward converter with hybrid-driven synchronous rectification (ACFC-HDSR) is brought out at the final.