I met an strange phenomenon when using the Plecs to measure the losses.
I measured submodule’s IGBT(IKW25N120CS7) losses in a MMC system, the switching losses are so high than in the datasheet. As in scope1.
For comparsion, I used a buck circuit to test under almost the same switching conditions, the result is in normal range. As in scope2.
When you compare them, you can find that: for the same switching off behavior, the loss is so high in scope1 with great junction temperature rise. But they use the same IGBT thermal model, could you please tell me what could be the reason?
Thank you so much for your help!