Dual-Path Hybrid Synchronous Rectifier in Active Clamp Forward Converter for Inductor Current Reduction

Abstract

A dual-path hybrid synchronous rectifier (DPH-SR) in active clamp forward (ACF) converters is proposed for inductor current reduction to solve inductor cooling problems under heavy load. In the proposed DPH-SR, the flying capacitor also supplies current to the output, thereby reducing the inductor current. In the measurement, the peak efficiency of the ACF converters with the proposed DPH-SR and conventional SR was 90.9 % and 89.0 % at 10 AOUT, respectively, resulting in the improvement in efficiency by 1.9 %. In addition, the inductor conduction loss of the proposed DPH-SR is reduced by 43.0 % by reducing the inductor current by 24.8 % at 20 AOUT.