The rapid development of computer technology has led mankind into the information society, and also promoted the rapid development of power module technology. In the 1980s, computers adopted switching power supplies and took the lead in replacing computer power supplies. Then switching power supply technology has entered the field of electronic and electrical equipment.
The development of computer technology, put forward green computer and green power module. Green computers generally refer to environmentally friendly personal computers and related products, According to the “Energy Star” program of the United States Environmental Protection Agency on June 17, 1992, desktop personal computers or related peripherals, if the power consumption is less than 30 watts under sleep, it meets the requirements of green computers, and improving power efficiency is the fundamental way to reduce power consumption. For a 200-watt switching power supply with an apparent efficiency of 75%, the power supply itself consumes 50 watts of energy.
Switching power module
The rapid development of the communications industry has promoted the development of communication power supplies. High-frequency miniaturized switching power supply and its technology have become the mainstream of modern communication power supply system. In the field of communications, rectifiers are often referred to as primary power sources, while DC-DC (DC/DC) converters are referred to as secondary power sources. The role of the primary power supply is to convert the single-phase or three-phase AC grid into a DC power supply with a nominal value of 48V. At present, in the primary power supply used in programmed switches, the traditional phase-controlled voltage regulator power supply has been replaced by a high-frequency switching power supply, the high-frequency switching power supply (also known as switching rectifier SMR) through the MOSFET or IGBT high frequency operation, the switching frequency is generally controlled in the range of 50-100kHz, to achieve maximum and miniaturization. In recent years, the power capacity of switching rectifiers continues to expand, and the single-machine capacity has been expanded from 48V/12.5A, 48V/20A to 48V/200A, 48V/400A.
Switching power supply
Due to the wide variety of integrated circuits used in communication equipment, its power supply voltage is also different, in the communication power supply system with high power density of high-frequency DC-DC isolation power module, from the middle bus voltage (generally 48V DC) into the required various DC voltage, which can greatly reduce the loss, easy maintenance, and installation, increase is very convenient. Generally, it can be installed directly on the standard control board, and the requirement for secondary power supply is high power density. As the communication capacity continues to increase, the communication power supply capacity will also continue to increase
Inverter power supply
The inverter power supply is mainly used for the frequency conversion speed regulation of AC motor, which occupies an increasingly important position in the electric drive system and has obtained great energy saving effect. The main circuit of inverter power supply adopts AC-DC-AC scheme. The power frequency power supply becomes a fixed DC voltage through the rectifier, and then the PWM high frequency converter composed of high-power transistors or IGBTs inverts the DC voltage into the voltage and frequency variable AC output, and the power output waveform is similar to the sine wave, which is used to drive the AC asynchronous motor to achieve stepless speed regulation.
The international frequency converter power supply series products below 400kVA have come out. In the early 1980s, Toshiba Corporation of Japan applied AC frequency conversion speed regulation technology to air conditioners. By 1997, its share had reached more than 70% of household air conditioners in Japan. Variable frequency air conditioning has the advantages of comfort and energy saving. China began to study variable frequency air conditioning in the early 1990s, and introduced production lines to produce variable frequency air conditioners in 96, gradually forming a hot spot for the development and production of variable frequency air conditioning. It is expected to reach a climax around the year 2000. In addition to variable frequency power supply, variable frequency air conditioning also requires a compressor motor suitable for variable frequency speed regulation. The optimization control strategy and the best functional components are the further development direction of the variable frequency power supply for air conditioning.
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