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How to choose the right power module?


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

In short, just like the mobile phone charger, your mobile phone is out of power and needs to be plugged in or charged before it can be used normally. However, you can't directly connect it to 220V for use, because the mobile phone will burn down. Therefore, a special conversion device is required to convert it into the voltage required by the mobile phone.

How to choose the right power module?

1. Circuit design principle and process

The distinction between good and bad circuit principles can only be made from a professional perspective. At present, the power module can be divided into two types: bare board and potting. The bare board can be arranged in an intuitive manner, such as the layout of electronic components is reasonable, orderly, generous and orderly, and the solder joints are bright, clean and straight. As for the potted module, it is impossible to check the internal situation, but because it is not exposed, it is much better in terms of safety and performance indicators. The welding process can include manual welding and wave soldering. The wave soldering process quality of mechanized production is better than manual welding.

2. Chip components

The core of the power supply is the IC, which is like the brain of the power supply. The quality of the IC directly affects the parameters of the 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, and the energy overload will saturate the machine

4. Electrolytic capacitor and ceramic capacitor

Electrolytic capacitor, power module and monolith electrolytic capacitor, which use sulfuric acid as insulating medium, can make larger capacity into smaller volume, and mark it with "+" symbol, and some with "-" symbol. It is generally used for low-frequency cross-linking and bypass filtering. The disadvantage is that the meson loss is larger. Monolith electrolytic capacitor, because of the special material, has better performance than ordinary electrolysis and better frequency characteristics, The power module can be used in precise circuits, such as oscillation or timing circuits.

Ceramic capacitors include ceramic dielectric capacitors, ceramic chip capacitors, ceramic tube capacitors, and ceramic semi variable capacitors. It is mainly nonpolar, the dielectric material is good, and the capacity cannot be too large. Suitable for high frequency circuits.

5. Batch test aging 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 it is difficult to control the incoming inspection of electronic components and transformers, only through the aging and high-temperature sampling inspection of the whole batch of power supply 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

Whether the final management means are strict and the supervision of incoming materials will ultimately become the final guarantee for the quality of its power supply products.

Through the above introduction, we must understand how to select the appropriate power module.

The above content is provided by Huizhi. For more information about power modules, please visit Huizhi's official website, or consult our service hotline or wechat customer service.