A large signal dynamic model for single-phase AC-to-DC converters with power factor correction
This paper presents a model for average current control that can be applied to DC-to-DC converters and AC-to- DC power factor correction (PFC) circuits. The proposed DC-to-DC model consists of two parts: 1) an averaged DC-to-DC converter topology with all the switching elements replaced by dependent sources 2) an average current control scheme with a pulse width modulation (PWM) model, which determines the duty cycles. Similarly, the AC-to-DC PFC model is obtained by combining an averaged boost converter model with the PFC control scheme using average current control. To verify the proposed model, simulated results were compared to experimental waveforms. The experimental results demonstrate that the model can correctly predict the steady-state and large signal dynamic behavior for average current controlled DC-to-DC and AC-to-DC PFC converters.