Electronics > Projects, Designs, and Technical Stuff
DC load using a CPU cooler
Jeroen3:
--- Quote from: microbug on October 04, 2014, 09:23:56 am ---@Jeroen3, unless I'm wrongly estimating the size, that heatsink won't get close to 300W.
--- End quote ---
Correct, 300 Watt is an enormous amount of energy. I'm not designing for that kind of currents or voltages.
For typical use, a 35-40 Volt OR (not and) 10 Amps should be enough. If more is required, I'd need to buy a better heatsink. Which will be heavier, bigger and more expensive.
The specification received from the OEM say: 0.25 °C /W @ 3000 RPM.
microbug:
I finally got round to resending the sample request email to IXYS. I think the last one didn't get through, as I sent it from my website's domain so it may have been spam filtered.
@Jeroen3, I think I'll stick with the Freezer A30 as it's more widely available if it fails. It's not too expensive and will easily fit two TO-247s.
microbug:
@timb Aargh! I just realised my PM to you didn't send! I've sent another; let me know if it gets to you.
Mr.B:
I am also designing a DC Load.
Seems to be project of the year here.
I am considering using a Corsair H60 watercooler. A bit more expensive than a Freezer A30, but should work well.
The copper plate is removable from the waterblock/pump assembly.
This way I should be able to directly reflow solder the FETs to the copper heat exchanger face.
I have emailed Corsair Tech Support asking for more detalis:
What is the thermal spec for the unit in deg C per W?
What is the maximum power dissipation of the unit?
Can the 'O' ring on the copper plate be easily removed and put back after soldering?
I eagerly await their response... I hope their Tech Support is quicker than Zelman Coolers.
One disadvantage of using the watercooler is that I don't know the electrical conductivity of the coolant.
This means that the fan forced radiator needs to be kept isolated from everything including the chassis.
Any thoughts as to whether this is a good or bad idea...?
SeanB:
The coolant will be water based, and likely quite conductive.
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