Types and applications of switching power supplies
There are two types of modern switching power supplies: one is DC switching power supply; Another type is AC switching power supply. The main focus here is on DC switching power supplies, whose function is to convert low-quality primary power sources (coarse electricity) such as mains power or battery power into high-quality DC voltage (fine electricity) that meets equipment requirements.
The core of a 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 supplies is basically the same as that of DC/DC converters, and the classification of DC/DC converters is basically the classification of DC switching power supplies.
Switching power supply is a type of power supply that utilizes modern power electronics technology to control the time ratio of switching transistors to turn on and off, maintaining a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and switching devices (MOSFET, BJT, etc.). High frequency is the direction of its development, which makes switching power supply smaller and more widely used, especially in high-tech fields, promoting the miniaturization and portability of high-tech products.
In addition, the development and application of switch mode power supplies are of great significance in energy conservation, resource conservation, and environmental protection. Especially in the field of high-tech applications, the development of switching power supplies has been promoted, with an annual growth rate of over two digits towards the direction of light, small, thin, low-noise, high reliability, and anti-interference.
Compared to linear power supplies, the cost of both switching power supplies increases with the increase of output power, but their growth rates are different. The cost of a linear power supply is actually higher than that of a 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 towards the low output power end, providing a wide range of development space for switching power supplies. High frequency switching power supply is its development direction.
