[OT] Design a MOSFET heat load
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 14th March 2004, 10:19 AM #1 akira   diyAudio Member   Join Date: Jan 2002 Location: Paris France [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
 14th March 2004, 10:30 AM #2 Magura   diyAudio Member     Join Date: Oct 2003 Location: Denmark, Viborg Use a big power resistor and a suitable power supply. Big power resistors are relatively cheap and a reliable controlled source of heat. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com
 14th March 2004, 05:23 PM #3 Nelson Pass   The one and only     Join Date: Mar 2001 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.
 14th March 2004, 09:08 PM #4 Jaac   diyAudio Member     Join Date: Oct 2002 Location: Amsterdam 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 __________________ The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick

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