Thread: Mosfet upgrade
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Old December 16th, 2006, 02:00   #11
Kos-Mos
 
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Join Date: Nov 2005
Location: Lévis (QC)
It is sufficient. You don't need a dsV above 20, unless you plan on having a 15 volt pack wired to your gun.

110A Continuous is well enough. The MOSFETs I use can take a 250A burst for 30 sec. every 5 min. Do you know a lot of people that shoot their AEG at 12v for 30 seconds steady? I don't. They used 220A MOSFETs, but the on resistance was 2.6 ohms. The lower, the better. This is the power consumption of the actual MOSFET. Mine have on resistance of 0.0026 ohms. It will generate about 100 times less heat than the ones they used.

And as I said before, nothing prevent me from building 2 mosfets in parallel. This will give a 220A continuous with 500A burst capability. As a comparaison, these little MOSFET could drive a 1200 class motor. I think that the ones used in our guns are 400 or 500 class. They are garanty no to fail even when used at 175°c. Your gun will melt before these get smoked.

I got these MOSFETs back when they where in prototype release. They have been designed to be used as switching voltage regulator in extreme situations.

And on top of that, If they are used along with the other module I am building, they will work only 60-70% of the time. No worries about that.

But since I plan on mass producing these MOSFET modules, I will fry some on tape to show how much abuse they can take. I got a IR tempgun to show the actual temperature of the MOSFETs. due to the package, it will be extremely easy to add a heatink on top of the MOSFETs.

Anyways. I just got back from the electronic supply store. Bought all the things I need to make some prototypes of both the MOSFET and PWM modules.

Last edited by Kos-Mos; December 16th, 2006 at 02:23..
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