A Simple Fast Voltage Controller for Single-Phase PFC Converters

In this work a simple and robust voltage controller is proposed to improve voltage dynamics in the Power Factor Corrected (PFC) converters. The proposed controller eliminates twice the line frequency ripples from the voltage feedback path allowing large bandwidth design of voltage loop controller. As the voltage ripple is cancelled without any filtering, the controller action can be exercised at frequencies comparable to switching frequency. This eliminates large overshoots and undershoots during transients, which are common in conventionally designed PFC converters. The design of the proposed controller is described and simulation results are presented to demonstrate the feasibility of the proposed technique.