Types of switching power supply and their recommended applications
There are two types of modern switching power supplies: one is DC switching power supply; the other is AC switching power supply. What is mainly introduced here is DC switching power supply. Its function is to convert the original ecological power supply (coarse electricity) with poor power quality, such as mains power supply or battery power supply, into a high-quality DC voltage (fine electricity) that meets the requirements of the equipment. .
The core of the DC switching power supply is the DC/DC converter. Therefore, the classification of DC switching power supplies depends on the classification of DC/DC converters. That is to say, the classification of DC switching power supply is basically the same as that of DC/DC converter, and the classification of DC/DC converter is basically the classification of DC switching power supply.
Switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of switching transistor on and off to maintain a stable output voltage. Switching power supply is generally controlled by pulse width modulation (PWM) IC and switching devices (MOSFET, BJT, etc.) The high frequency of the switching power supply is the direction of its development. The high frequency makes the switching power supply miniaturized, and makes the switching power supply enter a wider application field, especially the application in the high-tech field, which promotes the miniaturization of high-tech products, portability.
In addition, the development and application of switching power supply are of great significance in saving energy, saving resources and protecting the environment. Especially the application in the high-tech field has promoted the development of switching power supply, and the annual growth rate of more than two digits is developing towards the direction of light, small, thin, low noise, high reliability and anti-interference.
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 linear power supply is higher than that of switching power supply at a certain output power 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 side, which provides a wide development space for switching power supply. The high frequency of switching power supply is the direction of its development.
