Quasi sliding mode controller for single phase PFC boost converter

In this paper, a quasi sliding mode controller is proposed to control single phase PFC boost converter. The outer voltage loop is PI control and the sliding mode control is used in the inner current loop. The designed quasi sliding mode controller has advantages such as robustness when there are large variations in line voltage and output load. Moreover, the chosen sliding surface avoid the differentiator in the controller. Simulation and experimental results show a nearly unity power factor can be attained and there is almost no change in power factor when the line frequency is at various levels.