A novel hysteresis current control scheme for single switch type single phase PFC converter

With great advance of power semiconductor switching devices and their related control circuits, high frequency switching power converters can be implemented for power electronic appliances. In these converters, a pulse width modulation (PWM) technique is widely used. On the other hand, to improve power factor in utility AC side of converter a variety of power factor correction (PFC) converters are effectively introduced. For these converters, hysteresis current control method is developed and applying. Usually, this control scheme uses reference sinusoidal wave and upper limit signal which is determined by added constant value to reference signal, as well as lower limit signal which is determined by subtracted constant value from the reference signal. Using these signals, hysteresis current control method for PFC converter regulates its input current within the range that is determined by the upper and lower limit. In this paper the authors propose a simple configuration hysteresis controlled PFC converter which can effectively reduce current ratings of switching power device. The proposed PFC converter controls input line current keeps within the constant upper limit, specified by the switching power semiconductor device rating, as well as lower limit determined by reference sinusoidal wave. From FFT analytical results, the proposed circuit can lower the current rating of switching power device than fundamental component of input line current.