Classification of power supply modules;
According to the application field of modern power electronics, we divide the power supply modules into the following: 1. Computer high-efficiency green power supply modules. The rapidly developing computer technology has led mankind into the information society, at the same time, it also promotes the rapid development of power module technology.
In 1980s, the computer * * adopted switching power supply, taking the lead in completing the replacement of computer power supply.
Then the switching power supply technology has successively entered the fields of electronic and electrical equipment.
With the development of computer technology, green computers and green power modules are proposed.
Green computer generally refers to personal computers and related products that are harmless to the environment. Green power supply refers to the high-efficiency power saving power supply related to green computers. According to the 'Energy Star' plan of U. S. Environmental Protection Agency l in June 17, 992, if the power consumption of desktop personal computers or related peripheral devices in sleep state is less than 30 watts, it will meet the requirements of green computers. Improving power efficiency is the fundamental way to reduce power consumption.
As far as the current 75%-watt switching power supply with an efficiency of 200 is concerned, the power supply itself consumes 50 watts of energy.
2 high frequency switching power supply module for communication the rapid development of communication industry has greatly promoted the development of communication power supply.
High frequency miniaturized switching power supply and its technology have become the mainstream of modern communication power supply system.
In the field of communication, rectifier is usually called primary power supply, while DC-DC (DC/DC)The converter is called a secondary power supply.
The function of the primary power supply is to transform the single-phase or three-phase AC power grid into a DC power supply with a nominal value of 48 V.
At present, in the primary power supply used in program-controlled switches, the traditional phase-controlled stabilized power supply has been replaced by high-frequency switching power supply. High-frequency switching power supply (Also known as switching rectifier SMR)
Through the high frequency operation of MOSFET or IGBT, the switching frequency is generally controlled at 50-
In the range of 100 kHz, high efficiency and miniaturization are realized.
In recent years, the power capacity of switching rectifier has been continuously expanded, and the capacity of single unit has increased from 48 V/12.
5A, 48 V/20A expanded to 48 V/200A, 48 V/400A.
Due to the wide variety of integrated circuits used in communication equipment and their different power supply voltages, high power density high frequency DC-is used in communication power supply system-
The DC isolated power supply module is converted from the intermediate bus voltage to various required DC voltages, which can greatly reduce losses, facilitate maintenance, and is very convenient to install and increase.
Generally, it can be directly installed on the standard control board, requiring * * high power density for the secondary power supply.
Due to the continuous increase of communication capacity, the capacity of communication power supply will also continue to increase.
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