Design Of Switch Power With PFC And Soft-Switching Techniques

In recent years, power supply technique has developed very quickly and it has obtain very big of progress in theories researching and produced application. The research of power supply technique involves many realms such as the electric power electronics and the auto control. The soft switch technique and the high efficiency are important research contents of power supply. Therefore, Power Factor Correction (PFC) technique and soft-switching PWM technique are both widely applied in low power SMPS and high power SMPS.A high performance SMPS with PFC and soft-switching techniques is designed in this paper. It consists of two stages. The first one is single-phase power factor correction circuit. The second one is a full-bridge converter using phase-shifting control soft-switching technique.First of all, the paper introduced the development of switch power supply and it involved technology field, subsequently narrated many methods of advance of switching power supply. And then the paper introduced the design course of the whole system. Based on the detailed analysis of the principle of single-phase active PFC, the high power active PFC circuit is designed, and the method of designing boost inductor is also given in the paper. A high power phase-shifted-control soft-switching full-bridge converter is designed, and the condition of achieving ZVS is studied in detail. Finally, the waves of a prototype are given.