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Old 07-01-2011, 01:32 AM
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Default Re: Another DIY DC controller mock

Nice work val. From what I can see you are getting stuck on the miller plateau on turn on. That HCPL3120 driver does not have near enough kick for the application. Consider a 9amp driver sucj as the mic4421 or better still a VLA501 module.

If you drive the switch too fast the freewheel diode will not recover properly before the next cycle. I had this problem when I first ran my igbt controler at 16khz. Dropping to 8khz cured this problem. Consider snubber caps. At least 2 or 3 on the dc link and one across the switch. Next be aware of the ton and toff of the device and the freewheel. A lot of older modules have terrible values.

I have a few threads on here from late '09 dealing with these exact issues. Also got some videos on the subject. Hope that helps.
Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 1000 Amps, that's bad.
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