PFC controller and method of controlling the same

A power factor correction (PFC) control method for controlling a PFC controller, the PFC control method comprising:

• monitoring, by a distortion compensator, an input voltage of an input power source;
• determining, by the distortion compensator, whether the input voltage of the input power source is distorted by harmonics;
• deriving, by a current controller, a PFC input terminal requirement current value using an output of a voltage controller,
• deriving, by the current controller, a PFC duty using the PFC input terminal requirement current value and a PFC input terminal current value when the input voltage of the input power source is not distorted;
• and
• preventing, by the current controller, a divergence of the PFC input terminal current by deriving the PFC duty using a distortion frequency when the input voltage of the input power source is distorted,
• wherein the determining of whether the input voltage of the input power source is distorted comprises:
• generating, by the distortion compensator, a monitoring voltage having the same frequency as the input power source and the same phase as the input voltage of the input power source through a phase locked loop from the input voltage of the input power source;
• calculating the distortion frequency of the input power source based on a difference between the monitoring voltage and the input voltage input in real-time;
• and
• determining that the input voltage of the input power source is distorted when the distortion frequency is greater than or equal to a PFC current control band, and
• wherein the preventing of the divergence of the PFC input terminal current comprises deriving, by the current controller, the PFC input terminal requirement current value by dividing the monitoring voltage by a monitoring voltage peak value so as to scale the monitoring voltage and by multiplying the scaled input voltage value by the output of the voltage controller.