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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
I killed my bridge running ~350A at up to 120uS on-time and continuous polyphonic operation for about a minute with ~14" white hot ground strikes (this was with a smaller coil than the 23" spark one).
Have you observed the switching waveforms and primary current during this condition? Maybe you can gain some insight as to what the devices are really putting up with during this condition.
I guess this is why i never settled for anything without active current limiting.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
any reasonably rated igbt will "work", its efficiency that changes. and with a higher Vce sat. the igbt will drop more voltage for the same current, limiting the power you can push before burning past the 150deg C rating of semiconductors.
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oneTesla - a small single-board DRSSTC
