Some little knowledge about switching power supply

　　With the rapid development of power electronic technology, the relationship between power electronic equipment and people's work and life has become increasingly close, and electronic equipment is inseparable from reliable power supply. In the 1980s, computer power supply fully realized switching power supply, and took the lead in completing the computer power supply. In the 1990s, switching power supplies entered various electronic and electrical equipment fields, and switching power supplies were widely used in program-controlled switches, communications, electronic testing equipment power supplies, and control equipment power supplies, which further promoted the rapid development of switching power supply technology. . Switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switching transistors on and off to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. Compared with switching power supply and linear power supply, the cost of both increases with the increase of output power, but the growth rate of both is different. At a certain output power point, the cost of linear power supply is higher than that of switching power supply, and this cost reversal point. With the development and innovation of power electronics technology, switching power supply technology is constantly innovating, and this cost reversal point is increasingly moving to the low output power end, which provides a wide development space for switching power supply.

　　Switching power supply is to use electronic switching devices such as transistors, field effect transistors, thyristors, etc., through the control circuit, to make the electronic switching devices "on" and "off" continuously, so that the electronic switching devices can respond to the input voltage. Pulse modulation is performed to realize DC/AC, DC/DC voltage conversion, as well as adjustable output voltage and automatic voltage regulation. The switching power supply is generally composed of a pulse width modulation (PWM) control IC and a MOSFET. With the development and innovation of power electronic technology, switching power supply is widely used in almost all electronic equipment mainly because of its small size, light weight and high efficiency, its importance is evident.

　　The high frequency of the switching power supply is its development direction. The high frequency makes the switching power supply miniaturized and makes the switching power supply enter a wider range of applications, especially in the high-tech field, which promotes the miniaturization and lightness of high-tech products. change. In addition, the development and application of switching power supply are of great significance in saving energy, saving resources and protecting the environment.

　　People's switching power supply technology field is developing related power electronic devices, while developing switching frequency conversion technology. The direction of anti-interference development. The switching power supply can be divided into two categories: AC/DC and DC/DC. The DC/DC converter has now achieved modularization, and the design technology and production process have been mature and standardized at home and abroad, and have been recognized by users, but The modularization of AC/DC, due to its own characteristics, encounters more complex technical and process manufacturing problems in the process of modularization. The structure and characteristics of the two types of switching power supplies are described below.

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