Control method for inhibiting harmonic distortion of input current

A control method of inhibiting harmonic distortion of an input current for use in a power factor corrector, the power factor corrector being connected with a power conversion circuit and comprising a computing circuit, the power factor corrector being operated in a first mode or a second mode, the control method comprising at least steps of:

• (a) receiving a current command signal from the computing circuit;
• (b) comparing the current command signal with an input signal of the power conversion circuit, thereby generating a current error signal;
• (c) adjusting the current error signal;
• (d) judging whether the power factor corrector is operated in a transition interval between the first mode and the second mode, wherein if the judging condition is satisfied, an addition operation is performed on the unadjusted current error signal, a feedforward signal and the adjusted current error signal, thereby generating a current control signal;
• and
• (e) generating a switch control signal according to the current control signal, and controlling a switching element of the power conversion circuit according to the switch control signal, thereby inhibiting harmonic distortion of the input current.