Improved and accurate low‐frequency average modelling and control of a conventional power factor correction boost converter in continuous conduction mode

Abstract

When dealing with power factor correction (PFC) rectifiers that require the use of high filter capacitances, conventional small-signal modelling techniques are not capable of reproducing the converter behaviour accurately owing to the impact of the low-frequency dynamics on the system. In this context, this work presents an improved modelling technique applied to a conventional PFC boost converter operating in continuous conduction mode (CCM). The proposed approach leads to a more accurate analysis than the traditional modelling developed for dc–dc converters, which is often extended to rectifiers. It consists of a fast and concise solution for the implementation of several PFC techniques from the derived transfer functions. The introduced method is described aiming at the development of a boost-based PFC stage using the well-known one-cycle control technique (OCC). Simulation and experimental results are presented and thoroughly discussed to validate the theoretical assumptions.