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How to control the temperature of a peltier module? Answered

What is the most efficient way of controlling the degree of hotness or coldness of a 12v 6A peltier module? Can I use PWM?

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Josehf Murchison
Josehf Murchison

6 years ago

The thermostat circuit looks like this and it can be adjusted to the temperature you like.

You need a thermistor for ether hot or cold depending on what side of the peltier you want to control and it goes against the peltier module.

Thermostat.png
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ssjsahil201
ssjsahil201

Reply 11 months ago

dear sir,
please give information of op-amp IC and thermister IC you have indicate in circuit diagram
thanks

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Josehf Murchison
Josehf Murchison

Reply 11 months ago

You can use just about any opamp and wire it like a comparater then tweek the circuit to the needs of the components.

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ssjsahil201
ssjsahil201

Reply 11 months ago

sir ,
i have thermister of 1.5 kohm. can i use it with inplace of 15kohm ....Is peltier need heatsink and fan

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Josehf Murchison
Josehf Murchison

Reply 11 months ago

I hate the new format I cant see what I said to you in the past.
Yes on the heatsink maybe on the fan depending on how hot the heatsink gets.
It would be tight with the 15 kohm pot you might find a 2 kohm easier to adjust the temperature.

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JohnK589
JohnK589

Reply 2 years ago

The letter N stands for what? Negative Temperature Coefficient?

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Josehf Murchison
Josehf Murchison

Reply 2 years ago

That isn't an "n", it is the symbol for ohm.

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Nobilis
Nobilis

Answer 2 years ago

Thank you for the schematic, it helped me a lot!

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Analog Technology
Analog Technology

3 years ago

yes, you can use a PWM, to be honest, the most efficient way of controlling it is by using a controller, that is , TEC controller. I have ever met the same problem as you, I used one controller from a company called Analog Technologies, inc. As I am not very sure about your situation, you can select one from this page, http://www.analogtechnologies.com/tec-controller.htmldeeply hope that I can help u.

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ziege1
ziege1

4 years ago

We live where temperatures range between damn cold and damn hot (celsius).

Our small, old dog lives in a small, insulated house which is fully enclosed INSIDE the garage (under a bench) with a small hatch to the outside world. She frequently sleeps with a jug of water with a fish tank heater in it.

I'm trying to source ideas for a 12V automatic peltier heat/cool system which I can set and forget. I don't need to maintain a fixed temp, as long as I can adjust the damn cold and damn hot levels individually. Let's say 10-35degC (50-95degF).

Either a single reversed peltier or a heat & cool set would work.

Technically, I could build it but logistically, I'm busy that day, so I'd consider paying someone to parcel the working circuitry to me and I'll do the plumbing.

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Josehf Murchison
Josehf Murchison

5 years ago

At 12 volts the peltier will only draw what it needs 6 amps max, well within the TIP3055 transistors limits, and the Op amp is only getting something like 0.0012 amp, well within its limits.

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GreigS
GreigS

Answer 5 years ago

Okay, great! Thanks for the quick reply!

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steveastrouk
steveastrouk

6 years ago

PWM is generally a bad idea, unless you use some filtering to smooth it. Also, you need full bridge control.

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Jayvis Vineet Gonsalves
Jayvis Vineet Gonsalves

Answer 6 years ago

Hi Steve, thank you for reply. Do you know any other methods by which I can achieve the temperature control?

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steveastrouk
steveastrouk

Answer 6 years ago

Use linear control instead, if you can afford the extra power dissipation in the amplifier.

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Josehf Murchison
Josehf Murchison

6 years ago

A thermostat is the way to go.

Take a thermistor and connect it to a rail to rail or schmitt trigger opamp wired as an adjustable comparator. Then adjust to the temp you want.