Common sense of power module shell purchase

1. Regarding the working temperature of the power supply module, there are differences between domestic and foreign countries. Domestic manufacturers routinely set it to be used within a certain environmental temperature range, while foreign manufacturers routinely set the power module housing temperature. On the other hand, the working temperature of the company's products highlights the specific areas of the manufacturer, if some manufacturers can complete civilian, industrial or military grades.

Although it is not accurate to use the case temperature to measure the quality of the power module, the module is like a heat source, which has a great influence on the circuit system and other components. When the module housing temperature reaches 125°C, the internal temperature is best controlled within 150°C, but this level is currently difficult. The main reason is that the power module is miniaturized, the power density is getting higher, and the heat dissipation problem is more and more obvious.

2. The hotter the power supply, the more heat it emits. Therefore, more and more power supply module manufacturers choose metal casings, which can better promote heat dissipation and lower the temperature. The case temperature is closely related to the temperature of the internal components of the product, and determines the life and reliability of the module. High temperature will accelerate the aging of components and control the temperature range, which can prolong the service life and reduce the occurrence of failures.

3. The way the power module uses heat dissipation is also different in different use occasions and ambient temperatures. If it is used at an ambient temperature of 30 or 40 degrees, the case temperature reaches 70 or 80 degrees. This is considered normal use. Natural cooling, fans, and heat sinks can be used in unclosed spaces. Assuming that the maximum temperature of the power module housing is specified as 85°C, when working at an ambient temperature of 50°C, adding a small heat sink will just reach 85°C. When using a large heat sink, it can be guaranteed to be around 85°C even when working at an ambient temperature of 60°C.

4. The working temperature of the power module refers to the temperature during normal operation, and the temperature rise refers to the difference between the normal temperature and the working temperature. For different products, the temperature rise will be different. For example, the AC-DC power module has electrolytic capacitors and other components that are easily affected by temperature and reduce the lifespan. The basic temperature rise will be between 20 and 40 ℃. Generally, during product development, the service life of key components is carefully calculated to determine its operating temperature range. Although the DC-DC power module does not have electrolytic capacitor components, there are other materials that have temperature limitations.

When selecting a power supply module, the user needs to consider what kind of environment it is used in. In addition to paying attention to the parameter of the case temperature, the user must also pay attention to whether other parameters are in compliance.