Integrated magnetic BIFRED converter with lower intermediate capacitor voltage

The boost integrated flyback rectifier/energy storage DC/DC (BIFRED) converter is mainly used to achieve a high input power factor and input-to-output isolation. The use of this topology is limited because of the high DC bus voltage on the internal-energy storage capacitor and consequentially high voltage stress on the primary side semiconductors. This paper presents a modified integrated magnetic BIFRED converter topology, namely bi-flyback converter, with lower voltage stress. Moreover, the magnetic integration of the magnetic components reduces the overall cost, weight, and packaging size. Simulation results as well as experimental versifications for basic and modified topologies are presented.