Powering pelts (2 questions)

eX&TriC · 10-22-2001, 02:44 PM

Kryotherm DRIFT-0,8
Peltier element with the following specifications:
Qmax = 172 watt
delta T = 69° C
Vmax = 24.6V
Imax = 11.3A
Dimensions = 40 x 40 x 3.4 mm
Special = silicone-sealed

I was wondering about powering the pelt with two ATX 300W PSU in serie > 24V and 10A. Any advice
tips or suggestions about this. Is there a better way ? Iwould only like to use AT(X) PSU.

If I were to use a 16V pelt, what would be the best setup?

Greetz and tnx

hielko · 10-22-2001, 03:10 PM

A better way: they to get some 24V ebays or build your own PSU.

You could use two PSU's in series. But 10A isn't much for a 11.3A pelt, it could decrease the lifespan of the ATX PSU's significantly. Besides that: you will probably get better temps when you give the pelt a lower voltage, say: 20-22V.

Using a 16V pelt the best thing is to buy a 13.8V PSU.

eX&TriC · 10-22-2001, 03:19 PM

What about using a 350W ATX at 17V (+12V,-5V) to power the pelt ...

LiquidCool · 10-23-2001, 12:46 AM

On PSUs the -XX voltages can only handle 1amp at most, some not even that. Your best bet is to find 2 or 3 cheap PSU and combine them or get a high dollar Power supply and use it...

hielko · 10-23-2001, 05:32 AM

You could use one 350W ATX PSU and combine the 5V, 3,3V and 12V to get a nice voltage for one pelt. You must use diodes when doing this.

The voltage the pelt will recieve is: (12 + 5 + 3,3) - (3 * 0,7) = 18,2V

Dix Dogfight · 10-23-2001, 12:56 PM

I was under the impression that ATX PSU's have common ground which makes adding voltages from the same PSU pretty hard.
Please tell me im wrong.

hielko · 10-23-2001, 04:05 PM

If you use diodes it can't go wrong.

Butcher · 10-24-2001, 05:40 AM

Have you actually tried this adding thing? Even with diodes I wouldn't have thought it would work, you can't just add common ground voltages. Also you forgot to take off the diode voltage drops in your calcs.

Dix Dogfight · 10-24-2001, 01:27 PM

ATX PSU's have common ground outside the "box" which makes adding impossible. However if you pic the PSU apart and isolate each voltagesection it could theoreticly be done.
On most PSU's the grounds are allready connected on the pcb so in practice it's impossible .

Btw does anybody know if ATX PSU's are primary or secondary switched????

LiquidCool · 10-25-2001, 01:11 AM

My bad

It's AT supplies you can combine together. Course AT supplies are even cheaper than ATX...
http://www.procooling.com/articles/h..._as_one_.shtml

Butcher · 10-25-2001, 04:08 AM

I think most computer supplies are primary switched.

Dix Dogfight · 10-25-2001, 09:46 AM

Thanx Butcher

ondaedg · 11-02-2001, 10:44 AM

whoa, who wanted to link +3, +5, and +12 off same psu? Crazy man, crazy. =] It is virtually impossible to isolate each section of the power supply because they are usually all grounded to a single point in the supply (usually via a solder joint). It would be much easier to do what I will have posted in the next week on how to take two power supplies and run them in parallel.

10-22-2001, 02:44 PM	#1
eX&TriC Cooling Neophyte Join Date: Oct 2001 Location: Belgium (center of the universe) Posts: 51	Powering pelts (2 questions) Kryotherm DRIFT-0,8 Peltier element with the following specifications: Qmax = 172 watt delta T = 69° C Vmax = 24.6V Imax = 11.3A Dimensions = 40 x 40 x 3.4 mm Special = silicone-sealed I was wondering about powering the pelt with two ATX 300W PSU in serie > 24V and 10A. Any advice tips or suggestions about this. Is there a better way ? Iwould only like to use AT(X) PSU. If I were to use a 16V pelt, what would be the best setup? Greetz and tnx __________________ P4 1.8A @ 2.4 - 256MB PC1066 - GF4 355/780 Peltchilled-

10-22-2001, 03:19 PM	#3
eX&TriC Cooling Neophyte Join Date: Oct 2001 Location: Belgium (center of the universe) Posts: 51	What about using a 350W ATX at 17V (+12V,-5V) to power the pelt ... __________________ P4 1.8A @ 2.4 - 256MB PC1066 - GF4 355/780 Peltchilled-

10-23-2001, 12:56 PM	#6
Dix Dogfight Cooling Savant Join Date: Aug 2001 Location: Stockholm Sweden Posts: 128	I was under the impression that ATX PSU's have common ground which makes adding voltages from the same PSU pretty hard. Please tell me im wrong. __________________ If it ain't broke, fix it. Setup: Dual Duron 1100 \| Voodoo 3 2000 \| Addtronics W8500(WTX) \| Eheim 1250 \| Car radiator \| 2 Innovatech WB \|

10-24-2001, 05:40 AM	#8
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	Have you actually tried this adding thing? Even with diodes I wouldn't have thought it would work, you can't just add common ground voltages. Also you forgot to take off the diode voltage drops in your calcs. __________________ Once upon a time, in a land far far away...

10-24-2001, 01:27 PM	#9
Dix Dogfight Cooling Savant Join Date: Aug 2001 Location: Stockholm Sweden Posts: 128	ATX PSU's have common ground outside the "box" which makes adding impossible. However if you pic the PSU apart and isolate each voltagesection it could theoreticly be done. On most PSU's the grounds are allready connected on the pcb so in practice it's impossible . Btw does anybody know if ATX PSU's are primary or secondary switched???? __________________ If it ain't broke, fix it. Setup: Dual Duron 1100 \| Voodoo 3 2000 \| Addtronics W8500(WTX) \| Eheim 1250 \| Car radiator \| 2 Innovatech WB \|

10-22-2001, 03:10 PM	#2
hielko Cooling Savant Join Date: Feb 2001 Location: The Netherlands Posts: 108	A better way: they to get some 24V ebays or build your own PSU. You could use two PSU's in series. But 10A isn't much for a 11.3A pelt, it could decrease the lifespan of the ATX PSU's significantly. Besides that: you will probably get better temps when you give the pelt a lower voltage, say: 20-22V. Using a 16V pelt the best thing is to buy a 13.8V PSU.

10-23-2001, 12:46 AM	#4
LiquidCool Cooling Savant Join Date: Apr 2001 Location: Central Florida Posts: 231	On PSUs the -XX voltages can only handle 1amp at most, some not even that. Your best bet is to find 2 or 3 cheap PSU and combine them or get a high dollar Power supply and use it...

10-23-2001, 05:32 AM	#5
hielko Cooling Savant Join Date: Feb 2001 Location: The Netherlands Posts: 108	You could use one 350W ATX PSU and combine the 5V, 3,3V and 12V to get a nice voltage for one pelt. You must use diodes when doing this. The voltage the pelt will recieve is: (12 + 5 + 3,3) - (3 * 0,7) = 18,2V

10-23-2001, 04:05 PM	#7
hielko Cooling Savant Join Date: Feb 2001 Location: The Netherlands Posts: 108	If you use diodes it can't go wrong.

10-25-2001, 01:11 AM	#10
LiquidCool Cooling Savant Join Date: Apr 2001 Location: Central Florida Posts: 231	My bad It's AT supplies you can combine together. Course AT supplies are even cheaper than ATX... http://www.procooling.com/articles/h..._as_one_.shtml

10-25-2001, 04:08 AM	#11
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	I think most computer supplies are primary switched. __________________ Once upon a time, in a land far far away...

10-25-2001, 09:46 AM	#12
Dix Dogfight Cooling Savant Join Date: Aug 2001 Location: Stockholm Sweden Posts: 128	Thanx Butcher __________________ If it ain't broke, fix it. Setup: Dual Duron 1100 \| Voodoo 3 2000 \| Addtronics W8500(WTX) \| Eheim 1250 \| Car radiator \| 2 Innovatech WB \|

11-02-2001, 10:44 AM	#13
ondaedg Cooling Savant Join Date: Nov 2000 Posts: 130	whoa, who wanted to link +3, +5, and +12 off same psu? Crazy man, crazy. =] It is virtually impossible to isolate each section of the power supply because they are usually all grounded to a single point in the supply (usually via a solder joint). It would be much easier to do what I will have posted in the next week on how to take two power supplies and run them in parallel. __________________ ondaedg@procooling.com

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