In general, this type of module is called a load point (POL) power supply system or a use point power supply system (pups).
Because of the advantages of modular structure, modular power is widely used in switching equipment, access equipment, mobile communications, microwave communications and optical transmission, routers and other communications fields and automotive electronics, aerospace and so on. Especially in recent years, due to the rapid development of data service and the continuous promotion of distributed power system, the increase of module Power has exceeded the power supply. The module power supply has the function of isolation, anti-interference, self protection and easy integration.
With the large use of semiconductor technology, encapsulation technology and high-frequency soft switch, the power density of module is more and more high, the conversion efficiency is higher and the application is more and more simple. People in the field of switching power supply technology is the development of related power electronic devices, edge development switch frequency conversion technology, the two promote each other in the switching power supply to more than two digits per year growth rate towards light, small, thin, low noise, high reliability, anti-interference direction. Switching power supply can be divided into two types of DC and DC, DC/AC converter is now modular, and design technology and production processes at home and abroad have been mature and standardized, and has been recognized by users, but the modular AC/DC, because of its own characteristics so that in the process of modularization, More complex technical and process manufacturing problems are encountered. The structure and characteristics of the two types of switching power supply are described below respectively.