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With the popularization of electrical equipment, switching power supply is widely used in our daily life, and it is an indispensable power supply method. Then the editor will introduce switching power supply and its application fields to you.
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 supplies. In the 1980s, computer power supplies fully realized switching power supplies, and took the lead in completing the development of computers. Switching power supplies have entered various electronic and electrical equipment fields in the 1990s. Switching power supplies have been widely used in program-controlled switches, communications, electronic testing equipment power supplies, and control equipment power supplies, which has promoted the rapid development of switching power supply technology. . Switching power supply is a power supply that uses modern power electronic 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 the linear power supply, the cost of the switching power supply increases with the increase of the output power, but the growth rate of the two is different. The cost of a linear power supply is higher than a switching power supply at a certain output power point, which is a 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 range of development space for switching power supplies.
The 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. Carry out pulse modulation to realize DC/AC and DC/DC voltage conversion, as well as adjustable output voltage and automatic voltage stabilization. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. With the development and innovation of power electronic technology, the current switching power supply is widely used in almost all electronic equipment mainly due to its small size, light weight and high efficiency, and its importance is evident.
High-frequency switching power supply is the direction of its development. High-frequency makes switching power supply miniaturized and enables switching power supply to 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 supplies are of great significance in saving energy, saving resources and protecting the environment.
People’s switching power supply technology is developing related power electronic devices while developing switching frequency conversion technology. The mutual promotion of the two promotes the switching power supply to be light, small, thin, low noise, high reliability, with a growth rate of more than two digits every year. The direction of anti-interference development. Switching power supplies can be divided into two categories: AC/DC and DC/DC. DC/DC converters have been modularized, 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, makes it encounter more complicated 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.

Switching power supplies are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps , Communication equipment, audio-visual products, security monitoring, LED light bags, computer cases, digital products and instruments and other fields.