CCM-DCM average current control for both continuous and discontinuous conduction modes boost PFC converters

Abstract

This paper presents a CCM-DCM average current control (CDAC) control method for effectively controlling boost power factor correctors (PFCs). It is capable of operating in both the continuous conduction mode (CCM), the mixed conduction mode (MCM) and the discontinuous conduction mode (DCM). By estimating the average value of the inductor current in each switching cycle, the CDAC control method efficiency improvements and harmonic distortion reductions in boost PFCs operating over wide load range, especially operating in the DCM mode. Besides, it is mathematically and computationally simple. Compared with the conventional average current control method, simulation results verify the feasibility and performances of the proposed CDAC control method.