Description

This design is a digitally controlled: bridgeless: 300W: power factor correction (PFC) converter. The distinguishing characteristic of a bridgeless PFC converter is that it eliminates the need for a diode bridge at the input. This reduces power losses that normally occur in a diode bridge and: as a result: improves overall system efficiency. For this design: a C2000™ Piccolo™ TMS320F28035 microcontroller (MCU) is the digital controller for the PFC converter: controlling the two boost power stages that comprise the bridgeless PFC converter. By operating the stages alternatively during the positive and negative half cycles of the AC mains voltage: the Piccolo MCU implements both the AC-to-DC rectification as well as power factor control. This design achieves full load efficiency greater than 93% and power factor of greater than 0.98 at 50% or greater load.