Fast Dynamic Control of PFC Using Boundary Control with a Second-Order Switching Surface

The difference between the fast dynamics associated with the input current shaping of power factor correctors (PFCs) and the slow dynamics associated with their output voltage regulation is typically exploited by using multiple control loops. The overall dynamic response is generally limited by the output voltage regulation loop. Research into an analogy-based controller for fast dynamic control of PFCs is at a slow pace. This paper applies the concept of the boundary control method with a second-order switching surface for the boost type PFC, so as to achieve fast dynamic response. The method is based on predicting the state trajectory movement after a hypothesized switching action and the output can ideally be reverted to the steady state in two switching actions during the large-signal input voltage and output load disturbances. Theoretical predictions are verified with the experimental results of a 320 W, 100 V prototype