What is a switching power supply?

A switching power supply is an electronic device that converts electrical energy into a specific output voltage, current, or power. It converts the electric energy of the input power supply into high-efficiency output electric energy and is widely used in electronic equipment, communication equipment, computers, industrial automation, medical equipment and other fields.

The working principle of the switching power supply

The working principle of the switching power supply is to convert the electric energy of the input power supply into output electric energy in a highly efficient manner by controlling the conduction and disconnection of the switch tube. . Specifically, the working principle of the switching power supply can be divided into the following steps:

1. The AC voltage of the input power supply is converted into DC voltage through the rectifier circuit;

2. DC voltage Remove clutter through the filter circuit;

3. DC voltage is controlled by switching through the switching tube;

4. The conduction and disconnection of the switching tube controls the size and waveform of the output voltage;

5. The output voltage is transmitted to the load through the output circuit.

Application scenarios of switching power supplies

Switching power supplies are widely used in various electronic equipment, communication equipment, computers, industrial automation, medical equipment and other fields. Its main application scenarios include:

1. Electronic equipment: such as TVs, stereos, DVDs, etc.;

2. Communication equipment: such as mobile phones, routers, switches, etc.;

3. Computers: such as desktops, laptops, etc.;

4. Industrial automation: such as industrial computers, PLCs, etc.;

5. Medical equipment: such as medical power supplies , medical equipment, etc.

Analysis of the advantages and disadvantages of switching power supplies

Switching power supplies have the following advantages over traditional linear power supplies:

1. High efficiency: The conversion efficiency of switching power supplies is generally above 80%, while the efficiency of linear power supplies is only about 50%;

2. Small size: switching power supplies are usually much smaller than linear power supplies, which can save space;

3 .Light weight: Switching power supplies are usually much lighter than linear power supplies and can be easily carried;

4. Good stability: The output voltage of switching power supplies has good stability and is not easily affected by input voltage fluctuations.

However, switching power supplies also have some shortcomings:

1. Electromagnetic interference: Switching power supplies will produce electromagnetic interference when working, which may affect other electronic equipment;

2. High cost: The manufacturing cost of switching power supply is higher than that of linear power supply, and the price is also relatively expensive;

3. Involving high-frequency circuit design: The design of switching power supply needs to involve high frequency Circuit design has high technical requirements for designers.