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Some good news. Upped to 24v bus and larger load inductors. At 200amps the spike was +20v above the bus. Went for it and upped the gate resistors from 3r3 to 33r. Big improvement. Spike now only +3v above bus at 200amps with resultant miller knees. Time to start playing with resistors and schottkys.
i have a theory. The newer powerex cm400 modules i'm using here are much faster than the fujis i used in the car. So if they turn off faster than necessary it causes problems for this application rather than solves them. So if the switch goes off faster than than the diode can come on = problems. Need to find a balance ...
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
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