Hi all,
Today, I connected a TEC1 12706 to my power supply (12V and 18A), and I think the Peltier is burned in a few seconds. Is that because 18A is higher than 6 A which is needed for the Peltier?! I thought that they were like motors that can use draw the current they needed.
Any advice is much appreciated.
BR,
Masoud
It’s because you allowed the cell to get too hot without heat sinking it properly.
I had a very big heat sink connected to the hot side. I also used the thermal silver paste to reduce thermal resistance between the hot side and the heat sink. I am sure the heat dissipation was not the reason.
Power is I²*R, i.e. triple current means 9 times higher power. I'd suggest to current limit your power supply or reduce the voltage.
A fan may be needed for proper heat sinking.
Hi,
when using the Peltier board you need 2 controls.
Current flow thru the Peltier cell obeys Ohms Law.
A 40X40mm cell is usually rated at 12v, 5-6A @~ 2.5R
However, as the temperature changes so will the resistance/current draw.
No, because a normally functioning Peltier module does not draw 18 A. Most likely, the module overheated and one or more internal solder connections melted.
I had a very big heat sink connected to the hot side.
If the power was connected backwards, the heat sink was on the cold side, where it accelerated the overheating and destruction.
I found here that if I apply a higher current, it will burn the Peltier.
You don't "apply higher current".
The Peltier draws current based on the applied voltage and its resistance. You need to learn about Ohm's Law.
Please slow down before You blow up more then a Peltier. Learn physics, facts and don't use guesses, things blown out of the nose.
Hello guys,
My Peltier has broken again. I explain here everything. My goal is to control the temperature of a very small container (2 4 4 cm) using a Peltier plate (TEC12715). I want the container temperature changes between 40 and 10 multiple times (in a cyclic manner). In this regard, I used a very big GPU heat sink for energy dissipation and connected it to the Peltier using a DeepCool paste. I also insulated the small container using PS foam. I used a L298 motor driver to control the polarity of the Peltier (for heating and cooling). I used the other driver output for a fan that is fixed on the GPU heatsink. I run the code and everything was perfect. But after three cycles I could see that the temp change stopped and I understood that the Peltier is broken. I could also understand that easily from the fan speed since when the Peltier is broken the current through the Peltier reaches zero and the fan can work at full speed.
The power source that I used is a 12 V , 2 Amp adaptor. I know that it is not enough for the Pletier and the fan but I don't see any reason for burning the Peltier.
Any suggestion is very appreciated.
BR,
Once again, the temperature inside the Peltier module exceeded the manufacturer's absolute maximum rating, and the solder melted.
Possible causes are current too high, inadequate heat sink, inadequate fan cooling, poor thermal coupling, etc.
Burning things up means too much current flowing for the heat sink to handle.
Lower your expectations and run things at a lower current.
But the adaptor can only provide 2 Amp that is divided between the fan and the Pletier and the Peltier max current is 15 Amp based on the manufacturer. How is that possible?
and the heat sink is really giant. I am super confused.
Here are some images:
Is there any possibility that their product is absolutely fake and maybe a current below 2 Amp can burn them?
There is an excellent chance that anything you buy from Aliexpress is counterfeit, fake, recycled, etc.
And at $2 per Peltier module, I would guess that you are guaranteed to get junk.
Thank you. Is there any reliable source? Because I find the same names on Amazon but they could also be fake.
Somebody suggested the below:
Suppliers like Digikey, Mouser, Farnell, etc. and hobby outlets like Adafruit, Pololu, Sparkfun, etc. guarantee that their items are genuine. Almost all offer product support and in most cases, money back or replacement guarantees if the products fail during normal usage within specifications.
They are more expensive than the Asian, eBay and Amazon junk markets for those reasons.
You ALSO need a heat sink on the cold side to supply the heat that is to be transferred to the hot side. And it also absorbs the internal heat when you turn off the Peltier. The entire system is NOT as simple as you are using it.
Thank you. But considering the very small volume that I need to regulate, do I still need a heat sink? I did not use one there since I did not want to make the container volume bigger. and more importantly, can it be a reason for burning the Peltier?
Certainly! If the Peltier is ever turned off because your device is at the required temperature, there is no where for the internal heat to go to, except to the heat sinks. If no heat sink, the heat on that side of the plate will just accumulate.
