1. The power module is suitable for the requirements of its own scale: some foreign brands do have good quality, but the price is not acceptable to every user, and the delivery time is very long compared with domestic brands. For some of the larger power module suppliers in China, this problem also exists. If your order mode is not the main shipment mode, the delivery date cannot be guaranteed. It would be unthinkable if you suggested customizing a special power supply for small and medium-sized customers. Since small and medium-sized enterprises, such as huawei and zte, cannot choose a supply platform, it is very important to choose an enterprise suitable for their own scale. Companies such as tesla power supply specialize in providing power solutions and customized services to small and medium-sized enterprises.

2, see the power module product line: module power supply, for example, can provide industrial products such as brick, 1/4 brick, brick of 1/8, 1/16 brick this kind of industrial products, if not, explain enterprise research and development strength and the scale is not large, the ability of custom products, whether or not provide a rich custom products, such as railway, electric power, military custom experience are very important.

3. Communicated with the company's engineers to understand the implementation of the company's design standards and design procedures. Such as the company's product reliability design standards, reduction standards, electrical safety standards, EMC standards. Module design of new products is a very strict process, a company can guarantee delivery within a week the new product must be a company is not strict, it is very important to design details, such as power set of small overshoot and fall, the stability of the feedback network in extreme cases, these companies do well, small companies don't pay attention to these design details.

4. Look at the material of the power module: open the power module and have a look by yourself. It is more useful than listening to others that it works. From the use of power product materials, we can see the quality and positioning of the power supply manufacturer, such as the choice of power, such as capacitance, MOSFET, diode and other key materials, can determine the quality of the power supply. The first-tier large-scale factories, such as DCDC module power supply, have TDK as the large-capacity MLCC capacitor, and the basic tantalum options, such as Vishay, KEMET, AVX and MOSFET, are generally IR, Vishay, St, Riza, etc. The choice of the two poles is: ONSEMI, ST, IR, Infineon, etc. A very important power supply device.

5, see the power module product certification, certification is not only to the company's technology testing, but also the company's strength. Because the certification cost is not low, the factory inspection is not standard, small companies basically do not have any certification. In all certifications, the standard is basically the same. But the gold content of each certification body is different, easy to pass, the cost is lower. For example, UL certification is still very strict, and factory inspections are frequent and costly, so it is important to see if an enterprise has UL certification.