Modeling, analysis and control design of single-stage voltage source PFC converter

Among single-stage single-phase PFC circuits, voltage source topology seems to be among the most suited for low power universal line applications. So far, modeling and control of such circuits has been neglected. This paper presents simple and accurate quasi-static models for the single-stage voltage source PFC converter. Based on the small-signal analysis, the authors show the duty cycle to output voltage and switch current transfer functions for different line conditions. A few examples of single and two-loop compensators are demonstrated. This study is useful for engineers designing fast compensators for modern single-stage CCM PFC converters.