Unified supervised soft start-up and digital PI control for boost full-bridge converters

In this paper, we analyze a simple, yet effective nonlinear digital control approach; regulator behaves like a digital PI controller in steady state and sliding control in start-up phase. The proposed control is useful when the power converter cannot be controlled in start-up phase with control designed at steady state, because becomes instable, but we are interested only performances of converter in steady state. A simple finite state machine (FSM) to switch from a modality to another will be proposed.