AC/DC Switch Mode Power Supply with Power Factor Correction using Direct Energy Transfer Concept

Power factor correction (PFC) flyboost cell with a transformer having primary winding connected to input power and secondary winding connected to output rectifier, which has both functions as a flyback transformer and boost inductor. Combining the flyboost cell with DC/DC converter cells, forms a single-stage PFC converters. Both cells share one main switch and one controller. Letting the flyboost cell operate at Discontinous Coduction Mode requires a simple control for high power factor. Through flyboost cell, part of output power is processed once by main switch, and is referred to as direct power transfer (DPT), which will signficantly improve efficiency. The flyboost cell will automatically limit the DC bust voltage through flyboost transformer turn ratio. The converters are suitable for universal voltage applications