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Old 14th March 2004, 10:19 AM   #1
akira is offline akira  France
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Default [OT] Design a MOSFET heat load

Hi all,

Sorry for the slight off-topic post but I needed help from MOSFET masters.

I m building a Phase-change cooling for my computer. To test the cooling power I d like to try it on a heat load. (Not directly on the CPU). Therefore I d need a heat load that would be ajustable between 60 and 200W. I thought MOSFET would be a good try.

Could any of you, masters of the MOSFETS, draw me a quick shematic describing how I could do that ?

Thanks a lot,

Akira
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Old 14th March 2004, 10:30 AM   #2
Magura is offline Magura  Denmark
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Use a big power resistor and a suitable power supply.

Big power resistors are relatively cheap and a reliable controlled source of heat.


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Old 14th March 2004, 05:23 PM   #3
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I recommend the resistor approach, as it will work equally well
with AC and DC and is rugged and easy.

If you are using DC and you insist on Mosfets, just make a big
constant current source with Mosfets in parallel.

Making a current source is not a tough task, I suggest you
peruse the A75 or Zen articles ( www.passdiy.com ) where
there are some tutorials. Just remember that when you want
to get to 200W and are paralleling Mosfets, give each one its
own Gate and Source resistor. Measure the voltage across the
Source resistor(s) to determine the current, and set the DC on
the Gate(s) accordingly.
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Old 14th March 2004, 09:08 PM   #4
Jaac is offline Jaac  Netherlands
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Hi there see here Heatshink test In the past we did some heatshink tests. on the pic's you can see we used a big power supply 40V/70A. we ran ( ) some amps trough some resistors you then kan calc your power that is dissipated by your resistor.

sorry for the bad englisch

gr Jaac
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