Power module in the purchase process of basic knowledge
Author： Zhongyiguang Guangzhou Technology Ltd release time：2020-09-14 14:45:00CTR：
I. In terms of the operating temperature problem of power module, China and overseas will be quite different. Chinese manufacturers are basically included in the application range of working temperature, while overseas manufacturers are basically included in the housing temperature of power module.
On the other hand, the operating temperature of the goods of the enterprise highlights the special industry of the manufacturer. If some manufacturers can carry out civil type, industrial type or large truck type, etc.
Although it is not accurate to judge the quality of the power module by the case temperature, the module is like a heating element, which is quite harmful to the electronic control system and other components.
When the temperature of the module housing exceeds 125℃, the internal temperature should be controlled within 150℃, but this level is difficult for the present stage. The key reason is that the power module is more and more practical, and the power is higher and higher.
The hotter the power supply, the more heat it gives off. Therefore, many power supply module manufacturers choose plastic shell, which can push heat pipe to dissipate heat more strongly and reduce temperature.
The temperature of the casing is closely related to the temperature of the components inside the commodity, which determines the service life and credibility of the module. High temperature will accelerate the embrittlement of components, control temperature range, can increase the service life and reduce the occurrence of common faults.
Three, the power module in different applications and working temperatures, the choice of heat pipe heat dissipation methods are different. When in 30 or 40 degrees of working temperature under the application, the temperature of the chassis more than 70 or 80 degrees, which counts as all normal applications, not in the enclosed indoor space can choose the nature of water cooling, add fan, add radiator countermeasures.
Assume that the maximum temperature requirement of the power module housing is 85℃. For example, when working at 50℃, adding a small radiator just exceeds 85℃ or so. When large radiators are used, operating at 60 ° C can be ensured to be around 85 ° C.
The operating temperature of the power module refers to the temperature at that time when everything is working normally. The temperature refers to the error from the normal temperature to the operating temperature. For different goods, the temperature will not be the same.
For example, the ac-DC power supply module is equipped with components, such as electrolytic capacitors, which are vulnerable to temperature hazards and thus reduce their service life. The base temperature will be between 20 ℃ and 40℃.
Usually in product research and development, carefully calculate the service life of important components and decide the operating temperature category. Although the DC-DC power module does not have electrolytic capacitor components, it is also other raw materials with temperature limits.
When selecting the power module, the customer should fully consider the natural environment in which it is applied. In addition to the main parameter of housing temperature, the customer should pay attention to whether the other main parameters meet the requirements.
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