Performance characterization of a high power dual active bridge DC/DC converter

The analysis, control, and performance of a high-power, high-power-density DC/DC power converter that is based on the single-phase dual active bridge topology is described. For high-output voltages, on the order of kilovolts, a cascaded output structure is considered. The impact of snubber capacitance and magnetizing inductance on the soft switching region and various control strategies are discussed. Computer simulation results of a current mode controller are presented. Since the leakage inductance of the transformer is the main energy transfer element, special transformer design techniques are utilized to carefully control this parameter. The layout for a completed prototype 50 kW, 50 kHz unit operating with an input voltage of 1600 VDC is presented. Some experimental results are also presented.<>