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Old 09-13-2010, 08:51 AM   #31 (permalink)
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electrowizard, great to see you have it all working now and looks like you learnt a lot on the way. Switching 380 amps is impressive for any electrical design.

Hope your looking forward to your next electrical challenge

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Old 03-29-2012, 09:45 AM   #32 (permalink)
Deyan Stoev
 
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How exactly do you increase dt?

Hi to everyone in this wonderful forum!!!

It is an old thread with solution, which is not really obvious to me...

Quote:
Originally Posted by electrowizard View Post
Hey guess what? My controller no longer blowing mosfets!!!

The only thing we can change is dt, the time to switch. I have increased it to 200ns. The theoretical inductance needed to fry my mosfet is now 60nH.
So, electrowizard, how exactly do you increase dt - by adding 100 om gate resistance?

Thank you in advance!

P.S. I'm on 378-th page of the thread "Open ReVolt: open source DC motor controller" and still reading that marvelous guide!

Last edited by deodeo; 03-30-2012 at 04:07 AM..
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Old 03-29-2012, 06:35 PM   #33 (permalink)
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"Congratulations upon your success!"

As a retired-EE, I can definitely empathize with you and your problem. Turning voltage or current ON and OFF at high rates is always a headache, even when it's NOT power, but just signal-levels that are being switched!

Today's giga-Hertz computer board traces aren't designed, they're RF-traced, as constant imedance (Z) antennas!

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