View Single Post
Old 04-05-2010, 06:07 PM   #3316 (permalink)
adamj12b
Master EcoModder
 
Join Date: Apr 2009
Location: Charlton MA, USA
Posts: 463

EVVette - '71 Chevy Corvette Coupe
Thanks: 31
Thanked 183 Times in 94 Posts
Quote:
Originally Posted by jyanof View Post
with regards to the waviness - it looks like the paths from driver to gate are significantly longer than before (though I don't know what your current IGBT setup looks like - maybe it's about the same?). But, I've read that keeping these paths short will reduce parasitic inductance that can lead to 'gate ringing'. The gate capacitance basically forms an LC oscillator with this inductance. I'd think you'd get a much higher frequency 'ring' though...
I talked to Fran today who recommended using powerex modules and he said that he has observed this ringing in his designs and its completely normal.

I cant wait to get the ones I have built into power stages for my controller now!!

-Adam
__________________
www.EVVette.com - 1971 Corvette Coupe Conversion to all Electric!
www.AdamBrunette.com - Machining, CNC, Robotics and Electronics.

You can download RTD Explorer for the Cougar controllers at www.EVVette.com
  Reply With Quote