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We are using an hex IGBT module (datasheet: http://www.microsemi.com/document-portal/doc_view/7751-aptgt150ta60pg-rev2-pdf) which is driven by two separate IGBT drivers, the 2SC0108T2D0-07 (datasheet http://www.igbt.cn/UserFiles/CONCEPT/2SC0108T2Dx_Manual.pdf), using two channels on one, one channel on the other module to drive the "bottom" three IGBTs in the module as a DC-DC converter.

During some testing, we had set the current limit too high for the module, and something stopped working. During the de-bug stages, we took the unit apart and discovered that the drivers both had faults. After replacing both drivers, the faults went away, and we could run the circuit to check the IGBTs themselves.

By putting a voltage across each IGBT in turn, we checked that there was no current flowing when the IGBT was stopped, and then that current was flowing when the IGBT was activated again. By this method it looks like all the IGBTs are fully working.

The question is then: how did an over current event knock out both of the IGBT drivers, yet not damage the IGBTs themselves?

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  • \$\begingroup\$ without knowing anything about the schematic and involved signals, how should anyone tell? also are you sure the damaged drivers are the symptom, or are they maybe the cause of the overcurrent situation? \$\endgroup\$ – PlasmaHH May 17 '16 at 14:15
  • \$\begingroup\$ I doubt that drivers went off because of overcurrent on IGBT side. I saw Concept drivers blown, but after some 10yrs of hard work, the IGBTs were broken, too. I would check the PSU of the drivers, it shall be clear that they need separate PSU non dependant on your bridge. \$\endgroup\$ – Marko Buršič May 17 '16 at 14:19
  • \$\begingroup\$ Because the schematic is the IGBT driver connected to the IGBT and that's it. The current was originally limited from the external PSU, we increased the current limit manually, to try and overcome another issue. \$\endgroup\$ – Puffafish May 17 '16 at 14:19

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