Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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microbug:
Yes- I agree that it seems like an all round good idea.

FYI, I'm going with 3 100W rated MOSFETs on a 200W cooler (over voltage/current limits in hardware and temperature sensor on heatsink + emergency temperature cutoff on heatsink). Single channel 16 bit DAC controlling current, dual channel 16 bit ADC measuring voltage through a resistor divider, diode clamp and current limiting resistor and measuring current through an INA196. I chose 16 bit data converters because they are not too expensive (less than £2 each). Precision low offset op-amps are used.

Sorry for the brief wording but I'm typing this on a smartphone.

eneuro:

--- Quote from: poorchava on September 14, 2014, 02:09:53 pm --- bolt the mosfets to some random large heatsink and dump it into a tub of mineral oil

--- End quote ---
If we connect this tube to such room aluminium heater radiator (<10$ about 0.5m long ) we can probably run at full power without any fans  ;D

Easy and scalable-if we need more power to disipate simply add another one  >:D

Spikee:
It is alive !



It has a few bugs, i placed the 3d model facing the wrong way. So to fix the pinout i needed to mount the heatsink and mosfets on the bottom.
Also to rise the mosfets up it is advisable to use some discard able 0805 resistors under it so it rises the mosfet by around 1mm.

With some tweaking it is definitely something that is doable.

--- End quote ---

rob77:

--- Quote from: Spikee on September 17, 2014, 04:42:56 pm ---It is alive !

It has a few bugs, i placed the 3d model facing the wrong way. So to fix the pinout i needed to mount the heatsink and mosfets on the bottom.
Also to rise the mosfets up it is advisable to use some discard able 0805 resistors under it so it rises the mosfet by around 1mm.

With some tweaking it is definitely something that is doable.

--- End quote ---

where are your current sensing resistors ? even if you use 0R1 then it's 2.5W at 5Amps - can't see any resistors capable of 2.5W on your board ;)
and sorry , but i doubt it's alive - half of the parts are missing yet :D

Spikee:

--- Quote from: rob77 on September 17, 2014, 05:34:29 pm ---
--- Quote from: Spikee on September 17, 2014, 04:42:56 pm ---It is alive !

It has a few bugs, i placed the 3d model facing the wrong way. So to fix the pinout i needed to mount the heatsink and mosfets on the bottom.
Also to rise the mosfets up it is advisable to use some discard able 0805 resistors under it so it rises the mosfet by around 1mm.

With some tweaking it is definitely something that is doable.

--- End quote ---

where are your current sensing resistors ? even if you use 0R1 then it's 2.5W at 5Amps - can't see any resistors capable of 2.5W on your board ;)
and sorry , but i doubt it's alive - half of the parts are missing yet :D

--- End quote ---
There are two big ones on the bottom =)
mouser.com/Search/ProductDetail.aspx?R=WSL36372L000FEA

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