Here's where I am a little confused. I thought that snubber capacitors placed across the IGBT would protect them during "dead time".
It is a digitally controlled Hobart CyberTig.
You can see it here:
It is rated for 200A maximum. (and it does put out 200A).
If I set it to operate at, for instance, 137A, that would be very close to its actual output.
Open Circuit voltage 80V, typical arc voltage 30V.
i
I think that my IGBT's already have catch diodes (formed like a bridge also). Toshiba-MG200Q2YS40.
See file Toshiba-MG200Q2YS40_DAT-IGBT.pdf
i
That will happen anyway when the electrode gets lifted too far from the metal and the arc goes out. But the OP is going to put varistors across the supply, I hope. Chris
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