Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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Mr.B:
Apologies @microbug.
I am not wanting it to appear that I am hijacking your thread.
It is just that we are both designing a DC load and using similar or the same components.
I figured a shared knowledge thread was better than starting another one called "yet another DC load".  :D

Joenuh:
Just to let you guys know, I just got a reply that I will be receiving 5 samples of the IXTH75N10L2 tomorrow. I only asked once.. :-//

microbug:
@Mr.B, no worries! That makes sense. I haven't been working on my design for the past week or two; I need to get on with the schematic.

@Joenuh I don't know what country you live in, but here in the UK the official IXYS office appears to be unreachable. The only way I could get samples (which arrived today, BTW) was through a distributor (Neutron LTD). I've only got two of them, so I'll be using cheaper ones until I have to test the power dissipation.

EDIT: Offset voltage for the AD633 (jellybean multiplier) sucks, plus it's really expensive, so I'm going to do constant-power and constant-resistance in software.

macboy:

--- Quote from: microbug on October 15, 2014, 04:19:17 pm ---Offset voltage for the AD633 (jellybean multiplier) sucks, plus it's really expensive, so I'm going to do constant-power and constant-resistance in software.

--- End quote ---
Constant resistance operation does not require a multiply operation. Set the current to be proportional to terminal voltage, rather than setting it to a constant value. Constant power operation does require a multiply.

microbug:
OK... so I could switch the external reference on the DAC to a divided-down version of the input voltage, and compare the DAC output with that same divided down voltage.

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