Analysis of Parallel-Connected Asymmetrical Soft-Switching Converter

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, since each magnetizing inductor voltage is equal to one half of the input voltage. Two current-doubler rectifiers at the secondary sides are connected in parallel to reduce the current stress of secondary winding since the secondary winding current is less than one half of the load current. The asymmetrical pulsewidth-modulation technique is used in the proposed converter to regulate the direct current output voltage. The transformer leakage inductance and the output capacitance of switching switches are resonant during the transition interval between two switches in order to achieve zero voltage switching. 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