Design Of Phase-shifting Full-bridge High Power Switching Power Supply

With the development of Power Electronics, the technology of power is gradually being perfect. Due to wide applications of the rectifiers, various harmonic waves are produced. They pollute the electric network seriously and reduce the efficiency of production, transmission and utilization of electricity. To solve this matter, we should make input current wave sine, to improve power factor of this system. At the same time, DC soft-switching technique in high frequency and high density converter. Nowadays, Power Factor Correction ( PFC ) technique and DC/DC soft-switching PWM technique are both widely researched.This paper proposed the concrete scheme for the switching mode power supply with high frequency and high power based on the development of SMPS. The structure and parameters of the main circuit and the control circuit are designed in theory. The converter consists of forward and backward stage, of witch the forward is a single-phase Boost Power Factor Correction circuit, and the backward stage main circuit is a Full-bridge converter using Phase-shifting Control ZVZCS Soft-switching technique. The design project has been given in first, the principle of APFC and the control chip are analyzed in detail, and the parameters of the circuit an calculated; The traits of phase-shifting full-bridge are introduced and the process of the Full-bridge converter using Phase-shifting Control ZVZCS Soft-switching technique is analyzed concretely, the parameters of this part circuit are also calculated accordingly.Finally, a simulation for the entire system using PSPICE has been made.The results from simulations reveal that the design of system is feasible and the performance of the converter can meet the demand of the design.