This article presents a 12-1 V fixed gain Multi – Phase Direct Power Converter, a one-stage converter for high current applications. Based on the Direct Power Converter, and it's operation principles, it allows all the power devices to switch simultaneously with duty cycles up to 85 to 90% (which reduces the RMS current in the power switches drastically) and maintain the main advantages of the topology: Zero Current Switching (ZCS) and Zero Voltage Switching (ZVS). Due to the expected high output current and to reduce the path and so the losses, Segmented Winding Transformer (SWT) was implemented in the secondary side of the converter. All the phases are connected in parallel at the output to split the high output current into multiple parallel current paths. Besides, the output voltage ripple can be reduced as the phases can be shifted and each one can supply the output current directly to the output load, avoiding the output capacitor to discharge and allowing to reduce the overall output capacitance. A prototype was designed, built and tested up to 550A, obtaining a peak efficiency of 97% at 200A and 95% efficiency at 500A, 1V.
