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Old 11-03-2011, 01:16 PM
kajunkreations kajunkreations is offline
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Join Date: Jul 2011
Posts: 107

Hey guys, I need some help! I have my new Muller build all assembled, but i keep burning up mosfets. The coils are made of 14 awg wire with only 52 turns around a 1" core, so the impedance is really low. So I think I need stronger switches than mosfets, but Im not sure what to use whether a SSR or SCR or whatever. I am driving both HI and LOW side of the coil, so the switches have to be able to switch pos. and neg.

Thanks in advance,
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Old 11-03-2011, 02:12 PM
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citfta citfta is online now
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Posts: 1,268
If you post a schematic of what you have there are several people on here that have a lot of experience with mosfets and they may be able to help you. I can tell you a few things from my experience. If the mosfets are getting real hot and then dieing it is probably because they are not being turned on all the way. If you are not using mosfet gate drivers that would be a good place to start. If they are just suddenly dieing then you may be zapping the gate with spikes and need some protection like a zener from the gate to ground.

I have not used SSRs so I really can't comment about them. I have used SCRs and they will not work for what you want to do I don't think. Once a SCR is turned on it will stay one until the current through it is stopped by some other means. SCRs work great as a speed control for AC but don't work on DC. There are probably some other better ideas some of the other people can share with you too.

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Old 11-03-2011, 03:02 PM
kajunkreations kajunkreations is offline
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Join Date: Jul 2011
Posts: 107

I am using pull up and down resistors on the gates, they do turn all the way off when you test by triggering the hall sensor. any help would be great!

Last edited by kajunkreations; 02-25-2012 at 08:42 PM.
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