Hi,
I don;t know if this is even advisable as I know very little about electronics, - I never liked electronics when I was at school, but somehow managed to pass all the modules at Uni. None of them actually involved making anything though!
I think I'm after a PWM unit to control the amount of power supplied to 4x125W peltier units so that I can control how much cooling is performed by them
I have 8 water blocks, 4 in a loop
res -> Pump -> Y split -> 4 x 125W (cold side of) Peltiers (2 sets of 2 in series, in parallel) -> Y joint -> res
The opposite side of the heat blocks go to a second loop
Res -> pump -> Y split -> 4 x 125W (Hot side of) Peltiers (2 sets of 2 in series, in parallel) -> Y Joint -> res
The idea is that I can run the system under water cooling, or when desired, fire up additional cooling to lower the temps in the main loop without having to plumb in/out loops each time I want to make the change
Now, the problem I have is that I was going to use a variable resistance in order to change the voltage drop across the peltiers, but I've been advised/reminded that Peltiers don;t follow ohms law in the traditional sense as they are semiconductors, and cannot be treated as a resistive source. The advise was to use PWM to regulate the amount of power available to/dissipated by the Peltiers.
Can anyone offer any advice? I'm struggling due to the high power requirements. I'm very rusty on my electronics, so please forgive my ignorance.
Many thanks
Tatty


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