| This thesis discusses modeling and analysis methods for DC-to-DC converters using average current control. Furthermore, the modeling of a single-phase power factor correction (PFC) circuit with average current control was also investigated.; A new generalized model for average current control that can be applied to DC-to-DC converters such as the Buck, Boost, Buck-Boost and Cuk converters is presented. The proposed 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. This model can accurately predict the steady-state, small signal and large signal dynamic behavior for average current controlled DC-to-DC converters. To verify the proposed model, simulated results were compared to experimental waveforms of an average current controlled Boost converter. The experimental results demonstrate that the model can correctly predict the steady-state, small signal and large signal dynamic behavior of the average current controlled Boost converter.; In this thesis, a new model for a single-phase Boost power factor correction (PFC) circuit is also presented. This model is obtained by combining an averaged Boost converter model with the PFC control scheme using average current control. This model predicts the steady-state and large signal dynamic behavior of the PFC converter. Experimental results and circuit simulation results were compared to the proposed model simulations to verify the validity of the model. |
