I am trying to power a set of peltiers and am having some concerns, while I have a computer power supply I can dedicate to the product these are often high in the amps they can deliver, and the peltier specs say a max current that the device can handle, and sources indicate that the devices are in reality a short circuit of two seperate metals....I have tried a few lower amperage power supplies and they all seem to get dangerously hot no mater what my arrangement has been, and actually damaged one unit already by breifly connecting it to a cigarette outlet supply,though this was done as a test without any heat sinks attached it was only done breifly through a 2 amp car lighter adapter cord with a standard 10 amp fuse, so am affraid to risk this by hooking directly to a computer supply.
I am hoping that someone can advise me on a safe and preferably cheap solution to make the current from the laptop or other power supply safe for the peltiers to do their thing, but also have some concern as to the minimum currents being met. So better understanding on how exactly these work in reguards to if I were to have a 15v generator plant that only put out 1 amp would they still work ok as the plant should not overheat with the minimal resistance they have, I'd think and they could not draw more than it is producing, and it is resistance that is supposed to generate heat, in the transformers this heat may be from the inductuctance coils side more so than the resistance on the secondary id presume, though am no electrition just a newbie drawn experimenting with a something that seems cool.
I believe my modules are tec1-12705, but who really knows with chinese ebay products these days...
Alternatively is there a way to reduce the current from building up the heat in the transformers I have tried using, as a 15v 4 amp laptop supply has been tried as well as a 9v 1 amp but anything I use seems to get so hot and really dont need an electrical fire....thanks in advance for any advice to help with this product.
To add more specification I am trying to make a window air conditioning unit for a trailer window that has tilting slat pannels. I have heat sinks(with arctic freeze thermal paste) on the inside and outside with fans on both still (the heat sinks are from pentium 3/4 processors with the larger one on the hot side from old server units i got from a trade), neither heat sink seems to be making any remarkable change in temperature while running at any voltage I have tried, so am wondering how to best understand the heat pumping power of these things,as I understand there are people making refrigeration units out of them that can freeze things but cannot seem to get these to output much change at all. in fact I seem to only be generating extra heat from the power supply into the room.
I have heard of current limiting circuits though these are rather pricey and usually entail an adjustable interface which id just as soon not use, only wanting it to be fully on or off, but would like to be able to have the device be as efficient as possible, pwm suggestions make sense to a degree but presume this reduces the efficiency of the system by whatever factor of time it is in off status, id like to be able to have the device run at 15v but only feed it a minimum amount of amperage if this were possible to still yeild its effects.
I have an arduino I plan to use as a general temp. controller for the circuit once the power supply issues are worked out, so can someone please suggest the best method to power my peltiers for max performance/efficiency without destroying them?