Analysis and Modeling of PFC with Appreciable Voltage Ripple to Achieve Fast Transient Response

The classical design of an active power factor corrector (PFC) leads to slow transient response because the compensator used in this circuit is designed with narrow bandwidth. In this paper, the transient response of the PFC can be substantially improved by making the bandwidth of this compensator is relatively wide. It permits certain distortion in the line current that leads to a tradeoff between transient response and harmonic content in the line current. Because of the voltage ripple at the output of the compensator which is considered the control signal, both the static and the dynamic behaviors of the PFC change in comparison with no voltage ripple on the control signal. The static behavior of a PFC with appreciable voltage ripple in the output voltage loop is analysed in this paper by using two parameters: Amplitude of the relative voltage ripple on the control signal and its phase lag angle. These two parameters does not vary with the load and which determine the total harmonic distortion and power factor at the input of the PFC. Finally, the results are verified by MATLAB/ Simulink