A three-phase version of the hybridge rectifier associated to the three-phase ZVS DC/DC converter with asymmetrical duty cycle

This paper proposes the use of a three-phase version of the hybridge rectifier in the three-phase ZVS DC/DC converter with asymmetrical duty cycle. The use of this new rectifier improves significantly the efficiency of the converter because only three diodes are responsible for the connection losses in the secondary side. Besides, the current in the secondary side of the transformer is half of the output current. In addition, all the advantages obtained in the three phase dc/dc converter, i.e. the increase of the frequency of the output and input currents, the improved distribution of the losses as well as the soft commutation for a wide load range, are preserved. Then, the resulting topology is viable to achieve high efficiency and high power density at high power levels. The theoretical analysis, simulation and experimental results obtained with a prototype of 6 kW, as well as the comparison of the efficiency with the full bridge rectifier are presented.