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Old 07-29-2009, 09:28 AM #1
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Cool Check out these 18 amp diodes

A friend of mine picked these up yesterday and asked me to make him a heatsink, he's seen my work they are 18 amp continous draw LED's and can be pulsed to 100 amps. maby in a couple days I'll get the controller finished. these sucka's are going to draw 54 amps at full throttle, I'm thinking maby a pelter between the copper bar and the fins. anyone know where I can get a 400 to 600 watt pelter ?

[/IMG]

heres a shot of the completed heatsink unit with LED's attached.

[/IMG]

this unit is going to make a great dance light with the right controller

Peace All Pyro...


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Old 07-29-2009, 09:47 AM #2
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Default Re: Check out these 18 amp diodes

Hopefully most of that energy goes into light rather than heat. Ironically, the peltier unit itself will need a lot of amperage to operate as well.
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Old 07-29-2009, 10:29 AM #3
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Default Re: Check out these 18 amp diodes

If you're mounting them in a row, i suggest you to not use a single peltier cell, but a pair of ones in parallel (if you have a lot of amperes available ), or also better, in series, so you can limit the current to the one needed from a single cell, and just double the voltage (a thermostatic unit that works at 28 volt is a common schematic, and can also be find more easy than 12 volt units, cause all the machines at industrial level works mainly with 28V, instead 12V)

Also, a thermostatic unit prevent you from condensation and overcooling risks ..... just set it for 20 degrees, and forget it (also if with this powers, i suggest you to add a decent fan to that finned part, for continuous usage )

Only (but i suppose you already know this ), be sure that there is no irregularity between the copper bar and the finned part, where the cells are posed ..... not just cause the thermal conduction is better, but also cause the peltier cells are, basically, ceramic thin layers (i mean, it's too late when you assemble them and hear a little "crick" sound, don't think ? ..... )
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Old 07-29-2009, 10:44 AM #4
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Default Re: Check out these 18 amp diodes

Ive seen a 520 watt 60mm X 60mm TEC i think , Nice setup by the way will look nice when working

http://cgi.ebay.com/Gigantic-62mm-54...d=p3286.c0.m14

they use 0-16 volts @ 0-32 amps

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Old 07-29-2009, 11:24 AM #5
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Default Re: Check out these 18 amp diodes

thanks for the link I think I will use the 60x60mm TEC or maby two 40x40mm side by side that is what will fit the hetsink. I have a programed RGB controller but it's only good for 5 amps per channel so I'll have to add some big mosfets inbetween. I'm going to have to run this right off of lead acid cells. will post some pics when it's going.

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Ive seen a 520 watt 60mm X 60mm TEC i think , Nice setup by the way will look nice when working

Gigantic 62mm - 545 Watt Thermoelectric Peltier Cooler - eBay (item 310156525041 end time Jul-29-09 13:00:00 PDT)

they use 0-16 volts @ 0-32 amps
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Old 07-29-2009, 03:15 PM #6
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Default Re: Check out these 18 amp diodes

A peltier element doesn't make sense for cooling a high-power LED, you just increase the waste heat even more. Just a copper heatspreader and a fan is enough.
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Old 07-29-2009, 07:53 PM #7
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Default Re: Check out these 18 amp diodes

Thanks for the input DR. that is what I have now so that's the way we'll run it.

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A peltier element doesn't make sense for cooling a high-power LED, you just increase the waste heat even more. Just a copper heatspreader and a fan is enough.
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Old 07-29-2009, 08:11 PM #8
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Default Re: Check out these 18 amp diodes

If you do end up using a peltier, you're going to need a much larger cooling heatsink. It would be a good idea though to keep the diode temperatures down to increase the lifespan of those pricey LEDs
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Old 07-29-2009, 08:16 PM #9
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Default Re: Check out these 18 amp diodes

This should consume around 200W and maybe throw out 10k lumens. It'll make your eyes water Pictures!!

EDIT: looking again, I'd get a much larger heatspreader, unless you've got a turbine to supply the cooling air flow.

EDIT2: are these color or white light LEDs?
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Old 07-29-2009, 08:30 PM #10
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Default Re: Check out these 18 amp diodes

looks like RGB to me
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Old 07-29-2009, 08:46 PM #11
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Default Re: Check out these 18 amp diodes

These are a red a green a blue LED, each can sink 18 amps a piece, yes it will be blinding when I get it running. pictures at 11:00...

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Originally Posted by dr-ebert View Post
This should consume around 200W and maybe throw out 10k lumens. It'll make your eyes water Pictures!!

EDIT: looking again, I'd get a much larger heatspreader, unless you've got a turbine to supply the cooling air flow.

EDIT2: are these color or white light LEDs?
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Old 07-30-2009, 12:03 AM #12
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Default Re: Check out these 18 amp diodes

maby something like whats in your avatar as each one of these cost more than a 8X LD...

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If you do end up using a peltier, you're going to need a much larger cooling heatsink. It would be a good idea though to keep the diode temperatures down to increase the lifespan of those pricey LEDs
edit; well now it's this far along just got the controller hooked up, no power yet, now there are parts from my junk box, an electric range, a VCR, and a computer as well as the RGB controler, in this setup.
[/IMG]

edit; only running at 1.1 to 2 amps total at the moment ( it can eat 54 amps) and it's still realy bright and makes the most beautiful colors all over the walls and ceiling. I can't wait to hook up some 60 amp mosfets to this controller and get rid of these power eating limiting resistors !

[/IMG]
can you guess what this is ? theres only two.
[/IMG]
[/IMG]
[/IMG]
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Last edited by Flaminpyro; 07-30-2009 at 10:12 AM. Reason: add pictures
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Old 07-30-2009, 07:04 AM #13
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Default Re: Check out these 18 amp diodes

Diodes & heatsink are a bit bigger than I thought at first, the keyboard & mouse give a good size comparison (the KB is visible in the second picture as well, but hiding a bit, so it didn't quite register with me). Give it a go! Once the heatsink gets so hot that you can't touch it for a second, it's time to switch the power off again...
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Old 07-30-2009, 08:28 PM #14
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Default Re: Check out these 18 amp diodes

Where did you get those LEDs?! OMG!
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Old 07-30-2009, 08:42 PM #15
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Default Re: Check out these 18 amp diodes

Quote:
Originally Posted by Flaminpyro View Post
can you guess what this is ? theres only two.
It's you making a V sign; and a nice example of additive color mixing
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Old 07-30-2009, 09:45 PM #16
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Default Re: Check out these 18 amp diodes

Those are some monster diodes. Keep us posted when you get then running full tilt
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