- #1
aiswarya reddy
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Can I use a thermocouple which has a temperature difference of 1 degree to generate current to run a very small led.
Thermocouple Applications to generate current to run a very small led ?
- Thread starter aiswarya reddy
- Start date
In summary, the conversation discusses the possibility of using a thermocouple with a 1 degree temperature difference to generate enough voltage to power a small LED. It is suggested that this may be possible with a large heat flow and an increase in voltage, but in practice it is unlikely. The use of thermopiles, which involve connecting multiple thermocouples in series, is also mentioned as a way to generate higher voltage. However, these thermopiles require a flame to function and thus would not work with a 1 degree temperature difference. Another option mentioned is using Piltier devices, which can convert temperature differences into voltage, but they are typically used for 12 volt coolers and may not be practical for powering a small LED.
- #2
mfb
Mentor
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If you find some way to have a huge heat flow and if you can increase the voltage by orders of magnitude: maybe. In practice, probably not. LEDs need a minimal voltage (depending on the color, but at least ~2V) to work.
- #3
dlgoff
Science Advisor
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Here's a graph showing the Millivolts produced at various temperatures for several common Thermocouple types. Not much change in voltage per ºC change in temperature.
- #4
Mike_In_Plano
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When I was a kid, there was a project in an encyclopedia that used a series of thermocouples to power a small radio. By
wiring thermocouples in series, you get what's termed a thermopile.
The design I read about used a lamp socket and candle along with a bunch of thermocouples.
Later I learned that Russians often used a similar arrangement to power radios.
wiring thermocouples in series, you get what's termed a thermopile.
The design I read about used a lamp socket and candle along with a bunch of thermocouples.
Later I learned that Russians often used a similar arrangement to power radios.
- #5
jim hardy
Science Advisor
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Home supply stores carry thermopiles for gas appliances.
They come in 0.03 and 0.75 volt
https://customer.honeywell.com/en-U...=Thermocouples+and+Thermopiles&catpath=1.2.12
but they have to be immersed in a flame, your 1 degree isn't going to work.
They come in 0.03 and 0.75 volt
https://customer.honeywell.com/en-U...=Thermocouples+and+Thermopiles&catpath=1.2.12
but they have to be immersed in a flame, your 1 degree isn't going to work.
- #6
Mike_In_Plano
- 702
- 35
Yes, LOL, you'll need a zillion thermocouples to make it from 1 degree C or F.
Piltier devices (used for 12 volt coolers) offer a simple means of getting voltage from a temperature difference.
I've applied 12 volts to one, allowed it to settle, and then used it to power a small 6v bulb for a short time. Fun!
Piltier devices (used for 12 volt coolers) offer a simple means of getting voltage from a temperature difference.
I've applied 12 volts to one, allowed it to settle, and then used it to power a small 6v bulb for a short time. Fun!
1. How does a thermocouple generate current to run a very small LED?
A thermocouple works by utilizing the Seebeck effect, which is the conversion of temperature differences into electric voltage. When two dissimilar metals are joined together at two different temperatures, it creates a voltage difference between the two ends, known as the thermoelectric effect. This voltage can then be used to power a small LED.
2. What are the most common materials used in thermocouples?
The most common materials used in thermocouples are different combinations of metals, such as copper and constantan, iron and constantan, or chromel and alumel. These materials are chosen for their thermoelectric properties and their ability to withstand high temperatures.
3. Can thermocouples generate enough current to power larger devices?
Thermocouples are typically used for low power applications, so they may not be able to generate enough current to power larger devices. However, multiple thermocouples can be connected in series or parallel to increase the current output.
4. What factors can affect the efficiency of a thermocouple?
The efficiency of a thermocouple depends on several factors, including the temperature difference between the two junctions, the materials used, the length and diameter of the wires, and the type of insulation used to protect the wires. It is important to carefully select these factors for optimal performance.
5. Are there any safety concerns when using thermocouples?
Thermocouples are generally safe to use, but there are a few precautions to keep in mind. Since they generate electricity, they can pose a shock hazard if not handled properly. It is also important to ensure that the wires do not come into contact with each other, as this can create a short circuit. Additionally, thermocouples can become hot when exposed to high temperatures, so caution should be taken when handling them.
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