Research On Soft Switching Power Supply With High Power Factor Based On BOOST Converter

With the development of Power Electronics, the technology of Switching Mode Power supply(SMPS) is gradually being perfect. However, there is no end to the demand for a high power and high performance power supply. Nowadays, Power Factor Correction (PFC) technique is widely researched. Most Power electronics equipments are connected to the power system through rectifiers. The traditional diode and thyristor rectifiers are the main sources of the harmonies in power system. In recent years, many countries and international organization have proposed regulations on the harmonics of power equipment. Active power factor correction circuit can effectively reduce the harmonics of the rectifier and can meet the harmonics standard.This paper firstly analyzed the development of the switching power supply situation and the development of requirements, analyzed the basic constitute and fundamental configuration of the switching power supply. Secondly, This paper studies the basic structure, operating principles of ZVT-boost soft-switch ing PFC circuit and the implementing principle of soft switch. Based on those information, the main circuit structure is ascertained and proposal of control system is proposed.For the power requirements, the two-stage PFC circuit is used. The paper analyzes the topologies structures and elements characteristics of the common DC-DC converter, and found simply model for each converter. According to those models, the analysis of the converter characteristic, each converter advantages and disadvantages, and the principles of choosing the right topology for the different switch power supply are given. Finally simulating analysis is performed on the designed system.A high power and high performance SMPS is designed in this paper to meet the demand of its consumer. It consists of tow stages. The forward stage is a single-phase Boost Power Factor Correction circuit using UC3854 and the backward stage main circuit is a Full-bridge converter using Phase-shifting Control Soft-switching technique. Finally, a preliminary design of SMPS is proposed in this paper and the feasibility, innovation and superiority are proved though experiments.