PFC control loop modeling

caroline11

Abstract
A new continuous conduction mode (CCM) PFC controller, named ICE1PCS01, is developed based on a new control scheme. Compared to the conventional PFC solution, the new IC does not need the direct sinewave sensing reference signal from the AC mains. Average current control is implemented to achieve the unity power factor. This application note provides a model and a tool for evaluating and improving the control loop characteristics of ICE1PCS01-based PFC pre-regulators in boost topology. The goal is not only to ensure a narrow bandwidth in order to achieve a high Power Factor, but also to have enough phase margin so as to make sure the system is stable over a large range of operating conditions. The design example is demonstrated as well.