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Oh you are right. The point of the desat detection is to save the igbt, not to become aware of the failure. I need to look up desat detection before commenting on it. hahaha. But I suppose it's not that big of a deal to add a low pass filter after the output of the fault signal, and then monitor it. But I suppose the powerex people might be assuming that you don't have hardware overcurrent protection already. Maybe it's functionally the same thing.
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