High Efficiency DC-DC Converter
The paper presents a family of topologies used in DC-DC power converters employing two complementary switches in the primary and two MOSFET synchronous rectifiers in the secondary. This technique leads to soft transitions across switching devices and to a simple complementary square waveform for the driving signal of the MOSFET synchronous rectifiers. Using one topology from the family a high-efficient very dense 100W converter was built. Operating from an input voltage of 35Vdc to 72Vdc and providing 20A under 5V more than 90% efficiency at full load was obtained. Combining full-integrated multilayer PCB magnetic technology with the high efficiency target has lead to a power density of 52W/inch3
