FAST CONTROLLER FOR A UNITY-POWER-FACTOR PWM RECTIFIER

This paper presents an analog implementation of a fast controller for a unity-power-factor (UPF) PWM rectifier, The best settling times of m any popular controllers for this type of converter are on the order of a few line cycles, corresponding to bandwidths under 20 Hz [1]. The f ast controller demonstrated in this paper can exercise control action at a rate comparable to the switching frequency rather than the line f requency. In order to accomplish this while maintaining unity power fa ctor during steady-state operation, the fast controller employs a ripp le-feedback cancellation scheme.