The function of the power supply module is actually the conversion of voltage. It can transform ac or DC into the AC or DC you need. For example: to convert the 220V AC (AC) into 5V direct current (DC), because the 220V AC is high voltage, and the electronic products are low-voltage power supply, this needs a conversion device, will convert the 220V AC voltage into low voltage. For example, in the motor vehicle sometimes need to be converted into 220V ac to use, so this will become a low voltage to high voltage, because the voltage of the motor vehicle is generally lower.

In short, just like a phone charger, your phone is dead and you have to plug it in or charge it to work properly, but you can't connect it directly to 220V because it will burn out, so you need a special conversion device to convert it to the voltage required by the phone.

1. Principle and technology of circuit design

The distinction between good and bad circuit principles can usually only be made from a professional perspective. At the present stage, the power module can be generally divided into bare board and potting and sealing. The bare board can be arranged in an intuitive way, such as the layout of electronic components is reasonable, neat and orderly, generous and orderly, and the welding spots are bright and straight. The potting module, on the other hand, cannot see the inside, but it is much better in terms of security and performance indicators because it is not exposed. The welding process can include manual welding and wave soldering. The quality of wave soldering in mechanized production is better than manual welding.

2. Components of the chip

The core of the power supply is IC, which is like the brain of the power supply. The quality of IC directly affects the parameters of the power supply.

3. Transformer components

The transformer determines the power and temperature resistance of the power supply. The transformer is responsible for alternating current - direct current, energy overload will saturate the blast machine

4. Electrolytic capacitor and ceramic capacitor

Electrolytic capacitor, monolithic bravery and electrolytic capacitors, it adopts do insulating medium of sulfuric acid can be made smaller volume, large capacity and marked with + symbols, some marked - symbol, generally for low-frequency crosslinking and bypass filter, defect is meson loss bigger, monolithic capacitors, due to the use of special materials, performance is superior to the ordinary electrolytic, frequency characteristic is better, but can't do too much capacity, can be used to accurately in the circuit, such as oscillation, or timing circuit.

Ceramic capacitors are ceramic dielectric capacitance, ceramic chip capacitance, ceramic tube capacitance, ceramic semi-variable capacitance. It is mainly non-polar, medium material is better, the capacity cannot do too big. Suitable for high frequency circuit.

5. Batch test of aging and high temperature aging

No matter how well the materials and production processes are controlled, aging testing is required. Because it is difficult to control the incoming material detection of electronic components and transformers, only through the whole batch of power supply aging and high temperature sampling, can we detect the quality stability of this batch of power supply and whether there are potential safety risks of materials.

6. Management methods and incoming materials

Whether the final management method is strict and the supervision of incoming materials is the final guarantee to ensure the quality of its power supply products.

Through the above introduction, you will understand how to choose the right power module.