A large signal dynamic model for DC-to-DC converters with average current control

This paper presents a 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. 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 single switch 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.