What are the causes of failures in the IGBTs inside an inverter power supply?

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The IGBT is one of the most important components inside a variable-frequency power supply; its function is to convert direct current into alternating current for use by the motor. We often receive feedback from customers asking why IGBT damage can be so severe What to do if the IGBT is damaged? Generally, most customers experience this due to negligence in improper operation. Today, I have compiled some of the reasons that can cause damage to the IGBTs in frequency conversion power supplies: excessive temperature during the operation of these IGBTs. The bottom of ordinary heat sinks is equipped with cooling fans; when these fans fail or the heat sink fails to dissipate heat properly, it can cause the IGBT to overheat, leading to its damage. Furthermore, due to factors such as grid fluctuations and lightning strikes, which increase the stress it experiences, the reliability of IGBTs is directly related to the reliability of frequency-conversion power supplies. Therefore, when selecting IGBT modules, in addition to considering derating factors, the protection design for the IGBTs is also an aspect that needs to be given careful attention during the design of frequency conversion power supplies. When designing circuits, appropriate protective measures should be taken correctly to address the factors that affect IGBT reliability. These are some of the reasons that can cause damage to the IGBTs in variable frequency power supplies. In many cases, failures in such power supplies are caused by excessive temperatures; it is therefore evident that proper heat dissipation is very important for them. Hence, it is essential to ensure adequate heat dissipation for the variable frequency power supply during use, as well as to maintain good ventilation around it.