2. How to select the right power module

1. Circuit design principle and process

The distinction between good and bad circuit principles is usually only from a professional point of view. At the present stage, the power module can be roughly divided into bare board and potting. The bare board can be based on the intuitive way, such as the layout of electronic components is reasonable and orderly, generous and orderly, and the solder joint is bright, clean and straight. And potting module, can not see the internal situation, but because not exposed, in the level of security and performance indicators much better. The welding process can include manual welding and wave soldering process. The quality of mechanized wave soldering process is better than that of 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 AC – DC, energy overload will saturate the machine

4, electrolytic capacitor and ceramic capacitor

Electrolytic capacitor, and monolith electrolytic capacitor, it uses sulfuric acid as the insulating medium, can make a larger capacity into a smaller volume, and marked with the + symbol, some marked with the symbol -, generally do low frequency crosslinking and bypass filtering, the disadvantage is that the meson loss is larger, monolith electrolytic capacitor, due to the use of special materials, performance is better than ordinary electrolytic, frequency characteristics is better, But the capacity can not be made too large, can be used in precise circuits, such as oscillating, or timing circuits.

Ceramic capacitors include porcelain dielectric capacity, porcelain capacitor, porcelain tube capacitor and ceramic semi-variable capacitance. Mainly non-polar, medium material is better, capacity can not do too big. Suitable for high frequency circuit.