A wide output range reconfigurable structure dc-dc converter

The paper presents a new wide output range reconfigurable structure (WOR-RS) dc-dc converter, which is an extension of the full bridge isolated dc-dc converter with two output channels by adding an active switch and two diodes. The proposed WOR-RS is able to smoothly reconfigure the two output channels in parallel or series to realize wide output range. With this approach, the output voltage is shared equally in the series operating mode and so is the output current in the parallel operating mode. Therefore, the power rating of devices is significantly reduced compared to traditional isolated full bridge converter and the output rectifiers and filters can distribute power losses and thermal stresses. Operating principle, control strategy, modeling, and stability analysis are illustrated in the paper. An experimental prototype of a 200W DSP-based WOR-RS full-bridge dc-dc converter was built. The experimental results show the steady-state performance and fast dynamic response in the whole output voltage range, and verify the validity and applicability of this converter.