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Registered Member #1024
Joined: Sun Sept 23 2007, 10:56AM
Location: Northern NSW, Australia
Posts: 95
No problems, here is 61kHz :
The rise / fall profiles are basically the same from 0 to +/-10v , I no doubt could square it up even more with a bigger coupling cap on the primary side of the GDT as I currently only have 5uF (two back to back 10uF 250v electros). But I am waiting for some bargain priced 10uF 50v ceramic SMD caps to come along :), and the rise/fall times are ok in the critical regions, and at the end of the day, it works fine as is .
== update == Also: I see what you mean about your Vge waveform being rubbish now, before I only saw the nice sharp square wave :) , now I see the single polarity. That is naturally another benefit of driving with a GDT, full + and - swing on the gates .
== update == Mmm , nope, changed my mind , confused now, your last posted waveform looks fine, low duty cycle, but fine. Why do you think your waveform is bad ?
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
it look, that my wave form is very fast (ton and toff), but i don't use any R in series gate ... for duty cycle, i don't have potentiometer to set 555 50:50 wave...
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
take a look at CTconcepts website. They sell driver's geared to specific IGBT's, and there topology is good. They have some documentation. There boards have a built in half bridge drive, so a 555 input will run half bridge. I got driver boards for The same IGBT as yours, but the 300A version (FF300R12ME3).
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IGBT driver
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