I'm designing a circuit applying a variable voltage to a peltier element.
This voltage is controlled by a Labjack U6 analogue output.
My powersource is 200W 13.8V regulated DC
Peltier is maximum 12V maximum 9A
I'm using two resistors of 10kohm +-10%
The darlington pair is:
http://uk.rs-online.com/web/search/...od=searchProducts&searchTerm=485-9042&x=0&y=0
All I want is to be able to accurately vary the voltage applied to the peltier so any alternate circuit design would be welcome.
I've read that PWM is not optimal for peltier elements.
Here is the circuit, this circuit might be incorrect as well, this is one of the first circuits I ever built
Naturally this is horrible. When operating at normal voltages about 3-4V the transistor will have to dissipate the reminder. At a current of a few amps the dissipation is 10s of watts which it cannot handle causing it to overheat. So what is a proper setup for my needs?
This voltage is controlled by a Labjack U6 analogue output.
My powersource is 200W 13.8V regulated DC
Peltier is maximum 12V maximum 9A
I'm using two resistors of 10kohm +-10%
The darlington pair is:
http://uk.rs-online.com/web/search/...od=searchProducts&searchTerm=485-9042&x=0&y=0
All I want is to be able to accurately vary the voltage applied to the peltier so any alternate circuit design would be welcome.
I've read that PWM is not optimal for peltier elements.
Here is the circuit, this circuit might be incorrect as well, this is one of the first circuits I ever built
Naturally this is horrible. When operating at normal voltages about 3-4V the transistor will have to dissipate the reminder. At a current of a few amps the dissipation is 10s of watts which it cannot handle causing it to overheat. So what is a proper setup for my needs?
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