Hello guys, this is my first post of something that I like and I always call attention, the interior design of the power transistors, it was always said that the "incorporated" diode of the igbt is a feature that can not be avoided, but look this, it is a 40n60npfd of an inverter welder that fails, it is the original transistor that were put short and flew , we can clearly see that the "switch" is the white square, and the black rectangle (right) is the diode, and it is a diode because I measure it, but that is the report, what behavior will it have without the diode?

 

Hello,

An IGBT is basicaly a mosfet and a power transistor in one chip.
Read the wiki:
https://en.wikipedia.org/wiki/Insulated-gate_bipolar_transistor

There even seem to be two types of IGBT's:
https://components101.com/articles/what-is-igbt-working-operation-symbol-and-types

Bertus

 

Since a bipolar transistor is essentially two diodes, it can function as such. However, since bipolar transistors are not designed to be used as diodes, using them as diodes might cause a problem in terms of current and other ratings. ... Use dedicated diodes for typical diode applications instead of bipolar transistors.