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2022-03
What is a switching power supply
Author:
In the 1980s, the switching power supply (SMPS for short) was fully realized in the computer power supply, and the replacement work of the computer power supply was completed for the first time. Since the 1990s, SMPS has successively entered various fields of electrical and electronic equipment. SMPS has been widely used in program-controlled switches, communications, power supply of electronic testing equipment, power supply of control equipment, etc. With the development of power electronic technology, the relationship between power electronic equipment and people's work and life is increasingly power supply. Promote the rapid development of SMPS technology. SMPS is a power supply that uses modern power electronics technology to control the ratio of on and off times of switching transistors to maintain a stable output voltage. SMPS is generally composed of pulse width modulation control integrated circuit and metal oxide semiconductor field effect transistor. Compared to linear power supplies, the cost of SMPS increases with output power, but SMPS and linear power supplies have different growth rates. At a certain output power point, the cost reversal point, the linear power cost is higher than the SMPS. With the development and innovation of power electronic technology, SMPS technology continues to innovate, and this cost reversal point is also moving more and more to the low output power side, providing a broad development space for SMPS. High frequency SMPS is its development direction. High frequency makes SMPS miniaturized, making SMPS enter into wider application fields, especially in high-tech fields, which promotes the miniaturization and portability of high-tech products. In addition, the development and application of SMPS is of great significance for energy conservation, resource conservation and environmental protection.
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