Views:82 Author:Site Editor Publish Time: 2019-09-19 Origin:Site
Switching power supply is more and more widely used in our life, so what is switching power supply? Here is an introduction to you.
Switching power supply is a kind of high frequency power conversion device. The function is to convert a level of voltage to the voltage or current required by the user through different forms of the framework. The input of a switching power supply is mostly an AC power supply or a DC power supply, and the output is mostly a device that requires a DC power supply, such as a personal computer. The switching power supply converts the voltage and current between the two.
The switching mode power supply is different from the linear power supply. The transistor used by the switching power supply is mostly switched between the fully open mode and the fully closed mode, and the two modes have the characteristics of low dissipation. When switching, there is a high dissipation, but the time is short, so the energy is saved and the heat is less. In theory, the switching power supply itself does not consume electricity. Voltage regulation is achieved by adjusting the time of transistor conduction and break. On the contrary, in the process of generating output voltage of linear power supply , the transistor works in the amplification region and consumes electricity itself. The high conversion efficiency of the switching power supply is a great advantage, and because the switching power supply has a high operating frequency, a small-sized and light-weight transformer can be used, so that the switching power supply can also be smaller in size and lighter in weight than the linear power supply.
The switching power supply is widely used in the fields of industrial automation control, military equipment, scientific research equipment, security monitoring, digital products and the like.
Switching power supply can be divided into AC/DC switching power supply and DC/DC switching power supply. Switching power supply is developing towards popularization and miniaturization.
1.Micro low power switching power supply: The switching power supply will gradually replace all the applications of the transformer in life, and the application of the micro low power switching power supply will be first reflected in the aspects of digital display, smart meter, mobile phone charger and so on. At present, the state is vigorously promoting the construction of smart grid, the requirements of watt-hour meters are greatly improved, and the switching power supply will gradually replace the application of transformers in watt-hour meters.
2.Reverse series switching power supply: The difference between the reverse series switching power supply and the general series switching power supply is that the output voltage of the reverse series switching power supply is negative voltage, which is exactly the opposite of the positive voltage polarity of the general series switching power supply. And because the energy storage inductor outputs the current to the load only when the switch is turned off, the output current of the reverse series switching power supply is twice as small as that of the series switching mode power supply under the same conditions.