Function of power module
The function of power module is voltage conversion, it can convert AC or DC into AC or DC that you need. For example: to convert 220 V alternating current (AC) into 5 V direct current (DC), because 220 V AC power is high voltage, and electronic products are low voltage power supply, it needs a conversion device to convert 220 V AC voltage into low voltage. For another example, in a motor vehicle, sometimes it needs to be converted to 220 V AC to use, then it will become low voltage to high voltage, because the voltage of motor vehicles is generally low.
In short, it is similar to the mobile phone charger, your mobile phone is out of power, you need to plug in or charge to use it normally, but you can't directly connect to the 220V, because the mobile phone will burn down, so you need a special conversion device to convert it into the voltage required by the mobile phone.
2、 How to choose the right power module
1. Principle and technology of circuit design
The distinction between good and bad of circuit principle can only be made from a professional point of view. At present, the power supply module can be divided into bare board and potting. The bare board can be used according to the intuitive way, such as the reasonable layout of electronic components, orderly, generous, orderly, bright and straight solder joints. The potted module can not check the internal situation, but because it is not exposed, it is much better in terms of security and performance indicators. The welding process can include manual welding and wave soldering. The quality of wave soldering in mechanized production is better than that in manual welding.
2. Chip components
The core of power supply is IC, which is just like the brain of power supply. The quality of IC directly affects the parameters of power supply.
3. Transformer components
It is the transformer that determines the power and temperature resistance of the power supply. The transformer is responsible for AC-DC power supply. If the power is overloaded, it will saturate and blow up the machine
4. Electrolytic capacitor and ceramic capacitor
Electrolytic capacitor, and single stone electrolytic capacitor, it uses sulfuric acid as insulation medium, can make larger capacity into smaller volume, and marked with + symbol, some marked with - symbol, generally used for low-frequency cross-linking and bypass filtering, the disadvantage is that the meson loss is larger, single stone electrolytic capacitor, due to the use of special materials, performance is better than ordinary electrolysis, The frequency characteristic is better, but the capacity can not be too large, so it can be used in accurate circuit, such as oscillation circuit or timing circuit.
Ceramic capacitors include ceramic dielectric capacitor, ceramic chip capacitor, ceramic tube capacitor and ceramic semi variable capacitor. It is mainly nonpolar, the dielectric material is better, and the capacity cannot be too large. Suitable for high frequency circuit.
5. Batch test and high temperature aging test
No matter how well the product materials and production process are controlled, it is necessary to detect the aging. Because the incoming inspection of electronic components and transformers is difficult to control, only through the whole batch of power aging and high temperature sampling, can we detect the quality stability of this batch of power supply and whether the materials have potential safety hazards
6. Management means and incoming materials
Finally, whether the management means are strict and the supervision of incoming materials will ultimately become the final guarantee of whether the quality of power supply products can be guaranteed.
Through the above introduction, we must know how to choose the right power module.
