AC-DC converter with new PFC technique using forward and flyback conversion circuits

摘要

A new single-ended forward AC-DC converter with a power factor correction(PFC) technique using selectively forward or flyback conversion circuits in accordance with the input instantaneous voltage level is described. The converter is made up of a buck-chopper and a buck-boost. Both choppers are controlled by a common transistor switch drived by a PWM control system using feedback signal from the buck-chopper output. New PFC technique, the converter circuit, the PWM control system and the simulation results are described.