Input Admittance Analysis Based on One Cycle Control in Boost Single-Phase PFC Converters

Boost single-phase active power factor correction (APFC) is widely used to reduce input current harmonics. In this paper, input current distortion in the vicinity of input voltage zero crossing APFC in high line frequency is studied. Current loop model and input admittance model of APFC based on one cycle control (OCC) is presented. It is pointed out that its equivalent power stage of current loop is a 1st order system, and that its input admittance is the pure resistive around low frequency domain and the capacitive since 1 kHz around. However, it is does not matter in aero ac power system with 400Hz or 360~800Hz line frequency, and is suitable for applications as front converter in aero power supply system. The experimental results verify the theoretic analysis.