I'm unable to find any obvious information why it would be needed and what the consequences are if I don't get one.
I found your post when I'm reviewing TEC related topics. I was using a TEC to make a temperature control system. A company helps me a lot. They have full range of temperature control stuff. I think they may help you on this:
They also have more TEC modules selection. Find more, and I hope it helps.
Just want to ask ,I want to drive two Peltiers using mosfet should use mosfets or only one ?
daveg360:
I think that based upon your level of knowledge you may better using a motor controller. Something like:
http://www.robotshop.com/eu/cytron-10-30v-30a-single-brushed-dc-motor-controller.html?utm_source=google&utm_medium=base&utm_campaign=GoogleUKThis would make it straightforward to do. I know it's a lot more than just buying a suitable mosfet but bear in mind that a simple mosfet circuit doing PWM will create a lot of interference and probably need cooling, especially if you are controlling it from an Arduino pin.
Hi guys, I know this is an old thread but it's applicable to a project that I'm planning to start, I have parts on the way that should be here this Friday. The above quote is the direction I was planning to go for the initial prototype attempt, so let me lay out a bit of what my idea is.
So the setup I imagined is a 12v 6a peltier module (40mm x 40mm) attached to a larger conductive plate. Maybe around 80mm x 80mm. To the same side of that plate, and fairly near the center where the peltier will be attached, I thought to attach a digital temperature sensor. Most likely something like DS18B20 since it is a small three pin package with a flat side that I can attach to the conductive metal plate. The idea then was to drive the peltier from a dedicated 12v DC power supply and an L293D (Dual H-bridge). This way, I can control polarity and if needed, adjust PWM. The reverse side of the peltier would have a heat sink and fan or blower attached that would help dissipate heat/cold from the reverse side and hopefully make the heating and cooling more efficient. I had this idea because I have read that some people have stacked a pair of these, one to cool the other, and allegedly achieved lower temperatures. I ordered a pack of two peltiers, and heat sinks to test this, but I would prefer to only use one peltier if I can get away with it.
The overall idea here is to control the specific temperature of the peltier side which will be attached to the conductive plate. So if I specify something like 65 *F, the peltier will be heated or cooled until the thermometer is returning 65 *F. At the point where I have reached the desired temperature, an LED will be illuminated, and possibly PWM will be adjusted to hold the peltier at that specific temperature.
Before I get to that point, I would like to test the peltiers I have on the way and find out what maximum high and maximum low temperatures the unit can reach, feeding them the full designed 12v 6a with no PWM. I want to test them standalone, with heat sink attached, two stacked etc. Once I know those capabilities I plan to experiment with using PWM and maybe compare that to longer on/off cycles and see what works better. I will only need to maintain a specific temperature for a few seconds, maybe 15 to 30 seconds and the temperature range I'm aiming for is max ~120 *F / min -20 *F (If this is a realistic range.)
With everything already discussed in this thread before I came around, I'm really wondering how long a peltier can last if it is being controlled with an H-bridge and PWM, so I guess I'll find out when I have the opportunity to test it.
Does anybody have any ideas or suggestions?