Common-Source Active Clamped Complex Type Converter

This paper presents a novel common-source active clamped complex type converter. This converter is the intermediate isolated bus converter for the distributed power supply system in telecommunications equipment. Using active clamped circuits, the switching loss and switching noise can be reduced by means of the soft switching techniques. By adding an auxiliary winding to the transformer, proposed converter is a common-source type that is direct connection of sources of the two MOSFET switches. As a result, the pulse transformer becomes unnecessary, and the drive circuit is simplified. In the experiment, at 48V ratings input voltage, 36∼72V world wide input voltage, and 12V output voltage, the ZVS operation is performed on main switch and auxiliary switch, and highest efficiency 92.7% is obtained.