What is a switching power supply? What are the main uses?

A switching power supply is a power supply that utilizes modern power electronics technology to control the time ratio of switching tube conduction and turn-off to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. At present, switching power supply is widely used in almost all electronic equipment because of its small size, light weight, high efficiency, and is an indispensable power supply for the rapid development of electronic information industry. With the rapid development of power electronics technology, and people's work and life is increasingly close relationship, not open reliable power supply. 80's, the computer power supply to realize the switching power supply, the first to complete the replacement of the computer power supply. 1990's, the switching power supply has entered the field of a variety of electronic and electrical equipment. Has been widely used in program-controlled switches, communications, electronic testing equipment power supply and control equipment power supply, further promoting the rapid development of switching power supply technology. In addition, the popularization of electrical equipment, switching power supply products are widely used, such as LED lighting, air purifiers, electronic refrigerators, LCD monitors and so on. Although we know these products, but many people still do not know what is the working principle of switching power supply? What is the main use of switching power supply? 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, LCD monitors, LED lamps and lanterns, communication equipment, audio-visual products, security monitoring, LED light packages, computer chassis, digital products, and instrumentation and other fields. With the development and innovation of power electronics technology, switching power supply with its small size, light weight, high efficiency is widely used in almost all electronic equipment, the importance of which can be seen. What is the working principle of switching power supply? There are three general modes of operation for power supplies: fixed-frequency variable-pulse-width mode, fixed-frequency variable-pulse-width mode and variable-frequency variable-pulse-width mode. The former mode is mostly used for DC/AC inverter power supply or DC/DC voltage conversion; the latter two modes are mostly used for switching regulator power supply. Switching power supply output voltage also has three operating modes: direct, average and amplitude. Similarly, the former mode is mostly used for DC/AC inverter power supply or DC/DC voltage conversion; the latter two modes are mostly used for switching regulated power supply. Compared with linear power supplies, the cost of switching power supplies increases with the increase in output power, but the two growth rates are different. The cost of linear power supply at a certain output power point is higher than that of switching power supply. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating, and this cost inversion point is increasingly moving to the low output power side, which provides a broad space for the development of switching power supplies.