The power module is a power supply that can be directly mounted on the printed circuit board. Its feature is that it can provide power for application specific integrated circuits (ASIC), digital signal processors (DSP), microprocessors, memories, field programmable gate arrays (FPGA) and other digital or analog loads. Generally speaking, such modules are called point of load (POL) power supply system or point of use power supply system (pups). Due to the advantages of modular structure, modular power supply is widely used in switching equipment, access equipment, mobile communication, microwave communication, optical transmission, routers and other communication fields, as well as automotive electronics, aerospace and so on.
In recent years, due to the rapid development of data business and the continuous promotion of distributed power supply system, the growth rate of module power supply has exceeded that of primary power supply. With the extensive use of semiconductor technology, packaging technology and high-frequency soft switches, the power density of module power supply is getting larger and larger, the conversion efficiency is getting higher and higher, and the application is becoming simpler and simpler.
In the field of switching power supply technology, people develop relevant power electronic devices while developing switching frequency conversion technology. The mutual promotion of the two promotes the development of switching power supply towards light, small, thin, low noise, high reliability and anti-interference with a growth rate of more than two digits every year. Switching power supply can be divided into ac/dc and dc/dc. Dc/dc converter has been modularized, and the design technology and production process have been mature and standardized at home and abroad, and have been recognized by users. However, the modularization of ac/dc, because of its own characteristics, has encountered more complex technical and process manufacturing problems in the process of modularization. The structure and characteristics of the two types of switching power supply are described below.
Dc/dc conversion is to convert a fixed DC voltage into a variable DC voltage, also known as DC chopping. There are two working modes of the chopper. One is that the pulse width modulation mode TS remains unchanged and ton (general),
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