Nowadays power supplies with active Power Factor Correction (PFC) techniques are becoming necessary for many types of electronic equipment to meet harmonic regulations and standards, such as the IEC 61000-3-2. Power Factor Correction shapes the input current of power supplies in such a way to maximize the real power available from the mains. This paper analyses the function of high quality CUK rectifier module as a power factor correcting device in continuous conduction mode. The converter is designed by utilizing the idea of integrated magnetics. The control copie montre scheme consists of an inductor current calculator and an output voltage loop. Both Experimental and Simulation results are presented.