Electronics > Projects, Designs, and Technical Stuff
DC load using a CPU cooler
Spikee:
--- Quote from: microbug on September 13, 2014, 10:19:22 pm ---Spikee, your project sounds pretty interesting... I just selected the Arctic Cooler 13 (200W) for my load; I'm using 3 D2PAK 100W rated FETs and I'll add a thermal cutoff on the heatsink. How did you design in the bracket? Is it just a set of holes or is there a part you can buy?
With the 3 100W FETs, I could get a 300W load with the Arctic Cooler 13 Pro, but I don't really need the extra power. It would be quite easy to upgrade if I did though, just stick in the larger cooler.
--- End quote ---
It uses the intel 775 socket mounting holes. Theoretically all heatsinks that support this socket should fit.
The heatsink i use now can handle stock 150w and costs around 15euro. The A13pro can handle 300w but costs 35euro.
If i needed more power i would just use another board (it is modular isolated i2c control) or put an additional or faster fan on it.
rob77:
--- Quote from: microbug on September 13, 2014, 10:19:22 pm ---With the 3 100W FETs, I could get a 300W load ...
--- End quote ---
sorry, but you simply can't ;) you always have to consider the SOA (safe operating area) and also have to count with the thermal de-rating of the mosfet. for my load i paralleled 4 mosfets to get 100W dissipation and keeping the mosfets within SOA - i used IRFZ34N , "68W" each according to datasheet, but considering the derating and SOA, it's only 20-25W each.
blackdog:
Hi,
If you want a electronic load that has a good ac respons, look @ my schamatic on this dutch forum.
Please use google translate, and read howe to wire is, this is of great importance.
There are 2 types of electronic load's, one is the "stupid" type, only DC, and my schematic is a controled AC type.
But, the wiring must be done neatly, NO SPAGHETTI.
Read the hole Article, there is a lot of useful info in there.
Can you use different MOSFET's NO!
Can i use more MOSFET's, not in this schematic, the NE5534 cant drive more than 2.
Can i switch the BD139-16 for a 2n3904, NO!
Can i use a LM324 as a opamp NO,NO,NO
If you build it, folowing my derections, its better than Agilent enz.
why would you want to modulate the dummy load, only then watchin you scope you can see the real impedance of youre power supply.
And there are other neat tricks to do with a modulated Current Souce :-) (Class A Audio Amp)
The schematic,
Test setup on a PC heatpipe cooler
Article link
http://www.circuitsonline.net/forum/view/121338/1
Kind regarts,
Blackdog
poorchava:
If you don't need this to run at full power you can just bolt the mosfets to some random large heatsink and dump it into a tub of mineral oil. Ice water is even better but then you need to make sure that only fins of the heatsink are immersed. I made quick and dirty 24V/35A load this way using 12 SUP90N03 mosfets.
macboy:
A typical higher-end CPU heatsink is asked to dump 125 to 140 W of power into ambient (internal PC temperature) of 35 deg C while keeping the DIE, not heatsink, not case, but DIE temperature of the CPU below 60 deg C. Add to that the fact that it is compact and inexpensive, and it is a winner all around.
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