Recently I discovered, that some IGBT transistors in IGBT modules have the second pin for an emitter, called auxiliary emitter.
In the picture above 2nd and 4th pins are auxiliary emitters. This is from the datasheet to FS100R17N3E4 module.
However, I did not find any information about what are these pins used for, except that IGBT gate driver is connected to both 1-2 and 3-4 pins, but I do not understand why.
Could someone please recommend any literature on this problem? I would like to have a strong understanding of IGBT transistors and their drivers.
Is there any difference between 2nd and 27, 28, 29 pins, since they are at the same potential?