Novel Dual Output AC/DC Power Supply Using Switched Transformer Forward Converter with Active Front End Power Factor Correction

The paper proposes a dual DC output switched transformer based power supply with Active Front-End Power Factor Correction (PFC) working on single phase AC. The proposed topology combines two converters (Boost and Forward) which is realized through a simplified magnetics and control stage, resulting in reduction in component count and footprint. The switched turns ratio transformer is incorporated into the topology to minimize the power loss in the secondary Zener Regulator. The principle of operation, design calculations and simulation results are presented for the 230V and 120V AC line voltage operations.