The main attention to the quality of the currents absorbed from the utility line by electronic equipment is increasing due to several reasons. A low power factor can be due harmonic distortion of the line current which causes EMI problems and cross-interference. The basic rectifier using a diode bridge with a capacitor as filter gives unacceptable results. Thus, several methods are being invented which improve the power factor.

A fairly regulated output voltage can be obtained with a low power factor corrector circuit. When the line voltage is a sinusoidal line voltage, the converter must draw a current which is sinusoidal. To achieve it, a suitable reference sinusoidal signal is generally needed and the control objective is to force the input current to match with the reference current. In the earlier proposed work of the single switch, SEPIC PFC rectifier [1] does not use any controller.

Thus, feedback control is usually used with the converter circuit to achieve regulated output voltage, input current, i.e., input current waveform can be shaped typically by means of pulse width modulation (PWM). Basically, feedback controls are used for regulating the output voltage of the converter and for shaping of input current waveform which distorted due to injection of harmonics and nonlinear loads. This paper reviews different control techniques used for PFC.

The paper focuses on design and analysis of controller for the PFC rectifier using average current mode controller.

SEPIC, average current mode controller, compensator, PFC rectifier.