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davinchymobile asked How would I create an automatic thermostat circuite for a peltier cooler?
I am building a cooling device. I need to have coolant running through a water block on a peltier cooler.. I want to keep the coolant at about 5 degrees Celsius. The peltier will be around 350 watts and will have coolant running at around 14 psi over a short span of insulated tubing.. The heat source will produce aprox. 300 watts of heat but will vary depending on load. I have contemlated using a thermal switch and a relay to simply turn the peltier on and off as needed. If I can find no better solution that is what I'll be forced to do.. What I am hoping to find is a way to vary the temperature of the peltier dynamically. As it needs more power it will gain more power and as it needs less it the current will drop.. I know this is a simple thermostat but I'm hoping to do it all in dc current. I'm guessing this isn't that difficult and hope someone can help.. Thanks in advance. Davinchy
And got the following answer:
Use a temperature sensitive resistor in the feed back circuit of a DC regulator. The regulator would provide the Peltier with it's needed supply voltage. The temperature sensitive resistor could be the current limiter resistor of a zener diode, or in the adjustment circuit for one of the modern 3 terminal voltage regulators. The whole idea is that as the resistance of this resistor changes, it changes the voltage being supplied to the Peltier module.