A simple control architecture for four-switch buck-boost converter based power factor correction rectifier

This paper describes a simple control architecture realized using hybrid feedforward control for a power factor correction (PFC) rectifier based on a four-switch non-inverting buck-boost converter. The converter operates in continuous conduction mode, with smooth transitions between the buck and the boost operations across a line-cycle. To implement the PFC functionality, the controller computes the buck and the boost duty cycles based only on the sensed inductor current and output voltage. The hybrid feedforward controller operation and converter design are verified by experiments on a universal-input, 110-V output, 1-kW four-switch buck-boost PFC rectifier prototype.