High Efficiency DC-DC Converter
The paper presents a whole family of converters using two complementary switches in the primary side and two MOSFET synchronous rectifiers in the secondary side. These devices together with the main transformer and the filtering choke are coupled in large number of topologies. Using complementary switches one can obtain soft transitions across switching elements. Also the complementary square waveforms reflected in the secondary side offers a simple and efficient driving signal command for the synchronous rectifiers. Starting from one topology from the specified range a very efficient high-density 100W power converter was built. The converter operates from an input voltage of 35Vdc to 72Vdc, providing 5V at 20A, with efficiency above 90% at full load. High efficiency combined with the use of a full-integrated multilayer PCB magnetic technology has allowed a power density of 52W/inch3
