A New Non-Isolated Full Bridge Topology for Low Voltage High Current VRM Applications

In this paper a new non-isolated full bridge topology is introduced. The primary side of this topology is a full bridge; however, the input voltage ground of the conventional full bridge is connected directly to the positive point of the output and not connected to the input ground. In this arrangement, the input current flows directly to the load without going through the transformer. The secondary side rectifier stage is a current doubler. The primary side can operate in either phase shift soft switching mode or hard switching mode. The advantages of this topology, include soft switching and reduced conduction loss. A 1.41 by 1.41 inch power module has been built and tested to verify the analysis