aw come on, that copper vs. AL thread was like 10 pages long :p

As long as you draw current there will always be some ripple, just a matter of how much. The only way to stop it is to regulate the power, but that's lossy and the power supply will then need cooling.

Edward

You can add an inductor, that will reduce ripple. The problem is to find the inductor that can handle the current. Maybe in an old PSU.
A PI configuration, parallel cap + series inductor + parallel cap will give the best results.

inductor, is that like a choke? where it sets up a magnetic field to take up the slack when current falls?

ie. when current is up, magnetic field is up, when current falls, magnetic field collapses and is convered back to current in the choke to take up the slack.

Exactly.
Inductor stores energy, like a capacitors does. Inductors store current, capacitors store voltage.
Use a toroid choke, they are better and generate less EMI.

Haha okay maybe we'll break some records. I'll let this badboy go.
-Kev

I'm starting to think that I'll have to build this power supply on top of my case. Wish I had a cube case right about now.

This system is going to be a dual athlon XP, quad Peltier water cooled system.

440watt computer PS + 2x425watt peltier PS = 1290 watts!!! Bwah hah hah

Yeah that will be very kind to your electricity bill! :D

Whoa ;']

At this point it looks like you'll need to water cool your room ;']

Edward

yeah, can you say SPACE HEATER?
I'll be nice and toasty in the winter!!

this system is gonna be SO ludicrous.

I've already mounted the capacitor bank on top of the case, need to order the transformers and rectifiers.

Tested my high current psu couple of days ago... 2 explosed devices (small capacitor, fuse) and one small fire (another small cap), it works... :)
Only problem is damn thing weighs a ton, I have a 300W torroidal transformer (for dual 120Ws which I'm not longer getting, *sigh*) and it's about 6 pounds, too heavy.
Think I'll be getting a 220W TEC and a prebuilt switching supply, should be able to get one weighing around 1 pound for 25A.

which transformer should I get, 12.6V 25Amp(17.7V) or 13.5V 20 Amp(19.1V)?

each needs to power 2 172Watt pelts.

butcher, you talking about that meanwell s350? its like $100 + shipping.

[ 12-16-2001: Message edited by: resago ]

yeah they aren't cheap but big transformers weigh too much :p

As for the transformers, I think your volts are off... I make the 13.5V able to provide 16.9V ((13.5-1.4)*1.4 = 16.94) which would put you using about 20A with two 172W tecs. That's pretty close to the line. Also unregulated power supplies tend to suffer from voltage drop as load picks up so that 13.5V may only be able to provide around 15V with a heavy load on it.

and the 12.6V would drop to even less.

so should I go with the 13.5V or 12.6V transformer?

which would provide more cooling without blowing up?

Does anyone have the voltage/current graph for the drift-.08?

[ 12-17-2001: Message edited by: resago ]

I took the following text from another site:

220Watt Peltier
http://www.tekheads.co.uk/products.p...oductId=600604


With no sign of over-heating in connections,took some rough Volt/Amp readings under the above conditions :- 5v/7a, 6v/8a, 8v/11a, 10v/14.5a, 12v/17a, 13.8v/19.5a, 15v/21a, 16v/22a...
These observations may interest those choosing a suitable PSU for this Peltier.

I'd say go with either. On the one hand the 13.5V will give more power to the TEc so you'll likely get better temps. On the other hand the 12.6V is less likely to melt ;)

My current TEC supply is a 3-15V, 25A bench supply. It's a very nice unit but weighs 9Kg (about 20 pounds)!

If I could get the 220watt pelt in the US, I'd get those and go with the 12.6V 25amp TXfmr, I guess if I have to get 172watters, I'll get the 13.5V model.

I really wish someone in the states would carry those 220s. argh!

Here's the link to the 13.5V 20Amp Trxfrmr is anyone is interested.

http://www.mpja.com/product.asp?product=12788+TR

this is the site where you can also get the 50Amp rectifiers and delta 120mm fans.

Also this PS would just barely power the 220watt pelt at 12v
http://www.mpja.com/product.asp?product=12611+PS

[ 12-19-2001: Message edited by: resago ]

would any of these be an exceptable choke?
http://www.mpja.com/list.asp?dept=157
could someone explain the ratings and what specs I should be looking for?

[ 12-19-2001: Message edited by: resago ]

http://www.mpja.com/product.asp?product=12464+PS

5v @ 30a, if you get 4 of them you have 20v at 30a.

as well as of course the 4x 12v @ 8a and 4x -12v @ 4a

mounted caps(4 55,000uF 20V) and rectifiers(50Amp 400piv) to top of case, when I have a few more dollars, I'll get the transformers. Is there anyone that has a couple 220watt pelts you could send me?

I'd much rather get 2 12.6v 25AMP Trms than 2 13.5v 20AMP. but I NEED 220watt Pelts!!!


http://kornnutz.virtualave.net/supercool/power1.jpg

http://kornnutz.virtualave.net/supercool/power2.jpg

http://kornnutz.virtualave.net/supercool/power3.jpg

[ 12-22-2001: Message edited by: resago ]

The asus dually looks nice, but it looks like I'll need some of those golden socket thingys to overclock. Anyone know where I can get a couple?

I'm wondering what you're doing with that little waverunner :D

The toroidal look good, but there is no current rating. 0.1 Ohm resistance is too high for your current draw.
Just put four 5µH 10Amps.
I would try two capacitors at the input of the chokes, and the 2 others at the output.
You may try different combinations and see what work best.

Check out this page, thats the brand of the power supply I'm using, they sell a lot more powerful power supplies. http://www.power-one.com/products/acdcintro.html
You can even pick the parts you want for a custom power supply.
I have the 1500 watt model that is 24V 64A