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

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.