An isolated interleaved DC-DC converter with voltage doubler rectifier for PHEV battery charger

In this paper, an isolated interleaved zero voltage switching full-bridge converter with trailing edge pulse width modulation and output voltage doubler rectifier is presented. The target application for this work is the second stage dc-dc converter in a two stage 3.3 kW on-board charger for a plug-in hybrid electric vehicle (PHEV). A detailed converter operation analysis is presented along with a design procedure. The interleaved dc-dc converter operates efficiently, shares equal output power and uniformly distributes thermal losses among the individual cells. The proposed converter significantly reduces the number of output rectifier diodes, reduces input filtering requirements and also reduces the reverse recovery losses in the secondary rectifier diodes. Simulation and experimental results are presented for a prototype unit converting 400 V from the input dc link to an output voltage range of 150 V to 400 V dc at 3300 W with a peak efficiency of 96%.