An unified approach to predictive transition current mode control for digital-controlled power factor corrector

The main theme of this paper is to present a unified predictive transition current mode control for digital-controlled power factor corrector. The algorithms to achieve transition current control to reduce the reverse recovery loss of PFC are presented. These unified algorithms are derived for various kinds of digital pulse-width modulators including trailing-edge modulation, leading-edge modulation and triangular modulation. The switching period to retain zero current switching is predicted and the turn-on period is determined by the voltage controller. Therefore, zero-current detection is not required for the presented predictive transition current mode control. Experimental results derived from a DSP-based controller are presented for confirmation. The power factor corrector is with 250 W power rating, 100 V/AC/50 Hz input and 385 V/DC output. Experimental results demonstrate the effectiveness of the proposed unified predictive transition current mode control for digital-controlled power factor corrector.