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Question 1: IGBT failure form? We tested the IGBT that was damaged after the test and found that the IGBT gate source charge could not be discharged, remained at a voltage value of about 1.2V, and could not be charged or discharged. I want to know what kind of failure method this is?

Problem 2: Using a normal gate driver to drive a damaged IGBT is found to cause permanent damage to the gate driver. Our guess is the cause of the desaturation detection function.

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/IGBT%E6%8D%9F%E5%9D%8F%E5%AF%BC%E8%87%B4%E9%A9%B1%E5%8A%A8IC%E6%8D%9F%E5%9D%8F/td-p/673477

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Translation_Bot
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Hello. Without electricity, check the resistance between the gate and source to see if there is a short circuit or the resistance value is very small. IGBTs with damaged normal driver chip drivers themselves have the risk of causing driver damage, so this is not recommended. It is impossible to know the cause without the waveform before the damage. A failure analysis is recommended.

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/IGBT%E6%8D%9F%E5%9D%8F%E5%AF%BC%E8%87%B4%E9%A9%B1%E5%8A%A8IC%E6%8D%9F%E5%9D%8F/m-p/673562

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Translation_Bot
Community Manager
Community Manager
Community Manager

Hello. Without electricity, check the resistance between the gate and source to see if there is a short circuit or the resistance value is very small. IGBTs with damaged normal driver chip drivers themselves have the risk of causing driver damage, so this is not recommended. It is impossible to know the cause without the waveform before the damage. A failure analysis is recommended.

smartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/%E9%97%A8%E7%BA%A7%E9%A9%B1%E5%8A%A8%E5%99%A8/IGBT%E6%8D%9F%E5%9D%8F%E5%AF%BC%E8%87%B4%E9%A9%B1%E5%8A%A8IC%E6%8D%9F%E5%9D%8F/m-p/673562

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