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Got a little bit of a mystery. I purchased a range of 1W resistors and set about replacing each of the 3r3 gate resistors from the last experiments with a 15r for each igbt as per convention. Also replaced 0r33 emitter resistors with 1r. Powered up and it rang like a bell at switch on and off. Really bad. upped to 22r. still rang , 10r same or worse.
Went back to 3r3 on each gate and 15r on the input to the gate drive board. No more ringing. Slight bit on turn on. I suspect if I went back to 0r33 on the emitters that this will go away. I'll do this tomorrow and report back.
Any ideas?
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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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