Analysis and Design of Half-Bridge Converter with Two Current Doubler Rectifiers

A new half bridge converter with two current doubler rectifiers is proposed. Two transformers are used in the proposed converter. The primary windings of two transformers are connected in series to reduce the voltage stress across the magnetizing inductor. Two current doubler rectifiers at the secondary sides are connected in parallel to reduce the current stress of secondary winding and rectifier diodes. The asymmetrical pulse-width modulation technique is used in the proposed converter to regulate the dc output voltage and improve the duty cycle utilization. The transformer leakage inductance and the output capacitance of switching switches are used to resonant during the transition interval between two switches in order to achieve zero voltage switching (ZVS). The operation principle and design considerations of the proposed converter are provided. Experimental results for a 100 W (5 V/20 A) prototype are presented to verify the theoretical analysis and circuit performance