Abstract
The fast development of high-level computers has promoted the growing demands for switch-mode power supplies with high energy density and efficiency recently. Hence, the switch-mode power supplies operated at high frequency have evidently dominated over the conventional linear power supplies. However, sinusoidal ac currents chopped by the high speed switching devices into current pulses would not only affect the stability of the circuits but also deteriorate the power factor with more energy losses. Thus, the improvement on the power factor of switch-mode power supplies has been the common goal and incentive in the industry.In this thesis, average current control mode has been employed for simulating the complete power circuits with the help of EDA software, namely Pspice, on analyzing circuits and modeling devices such that stability and high power factor can be achieved. Moreover, the paralleling of power supplied has been studied for correcting the power factor with optimized operational regions under power overload conditions. The results are promising for the future applications of simulation in PFC circuits.