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DC-DC converter / PWM booster usable for a TEC chiller - Page 2

post #11 of 15

Nah.. those don't work real well.. the pwm frequency is normally to low. I tried something like that a few years ago, it was $50 and went straight into the trash can. Save your money imo.
post #12 of 15
Quote:
Originally Posted by Mindchi|l View Post

Nah.. those don't work real well.. the pwm frequency is normally to low. I tried something like that a few years ago, it was $50 and went straight into the trash can. Save your money imo.

Why it didn't work? The circuit is very simple and functional.
I have two of those, one switching at 3KHz, the other at 12KHz. There are some switching at much higher frequencies (e.g. 30KHz).
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post #13 of 15
Thread Starter 
Well, converting DC-DC with the overhead etc. seems to inefficient and problematic in my opinion, and I cant have another PSU inside my chassis, so what I am thinking of right now is a more simple solution.

Since I have the settings 6v and 12v to play with, I will have to live with that for now. What I am considering to do is to make a simple adjustable thermostat. The thermostat will switch a relay, adjusting 6v / 12v. I will then use the 12v to chill the cold water temp down to fx 15C, and then switch the system to 6v until the water reach the temp of fx 19C. In most normal use scenarios 6v on the 4 tecs, seems to be fine for holding the water temp below 18C.

Yesterday I measured the system power-usage:
Code:
4x12v, P4@5.4GHz 
Benching ~ 600W measured on the AC plug. 
Idle ~ 530W.  
CPU temps maxed out around 52C*

4x6v, P4@5.4GHz 
Benching ~ 300W measured on the AC plug. 
Idle ~ 230W.  
CPU temps maxed out around 57C

Thats with an idle Nvidia 7300LE (low power, passive cooled)

So I definitly need the 6v setting for everyday usage. 2kwh costs $1 USD where I live.

*Unfortunately I did a big bummer buying fans "Enermax Cluster UCCL12 PWM" for my new hwlabs GTX360 radiator, so I cant cool the hot water (hot water temps 41C). I have to shift those fans to Scythe 3000rpm or something similar. I had far better cooling performance on my old 120.2 (hot water temps 35C) with scythe fans. They really mean it when they say that the GTX360 radiator needs high speed fans with high static pressure. - Another lesson learnt

My Phobya thermometer on the cold-water died. Its on, but I the digits are gone, so I have to RMA it. Pretty annoying when I cant measure the cold water temp.

Just to learn something more, I will consider buying one of those ebay pwm motor controllers. My intuition tells me that it is fail economy - like Mindchill writes, but sometimes things just need to be tested.
Edited by qwwwizx - 5/20/12 at 6:56am
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RAMRAMHard DriveHard Drive
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OtherOtherOtherOther
HWlabs Black-Ice SR-1 420 Radiator 3 x Prolimatech 140mm 3 x Silverstone Airpenetrator 141 3x Silverstone 121FM Fans (gfx) 
OtherOtherOtherOther
1x Swifttech MCP35x + MCP35x reservoir  EK Water Blocks Nichel-Acetal Supr. HF CPU EK Water Blocks Copper-Plexi Supr. HF VGA 2m ½" tube 
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P4 641 Asus Maximus Formula x38 Nvidia Geforce 7300LE Samsung PC5300 
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4x Dominator GT waterblocks 1x EK CPU Supreme HF 2x EK DC 4 Pump  2x EK basic 250ml cylinder reservoirs 
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post #14 of 15
Thread Starter 
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CaseMouseMouse PadAudio
CM Stacker 830 SteelSeries Xai Laser RUSE Gaming SteelSeries Logitech G35 
OtherOtherOtherOther
HWlabs Black-Ice SR-1 420 Radiator 3 x Prolimatech 140mm 3 x Silverstone Airpenetrator 141 3x Silverstone 121FM Fans (gfx) 
OtherOtherOtherOther
1x Swifttech MCP35x + MCP35x reservoir  EK Water Blocks Nichel-Acetal Supr. HF CPU EK Water Blocks Copper-Plexi Supr. HF VGA 2m ½" tube 
CPUMotherboardGraphicsRAM
P4 641 Asus Maximus Formula x38 Nvidia Geforce 7300LE Samsung PC5300 
Hard DriveCoolingCoolingCooling
Seagate 8x TECs, 50x50x41mm (288 couple) 35v 2x Phobya Temperature displays Neoprene tube 19/13 
CoolingCoolingCoolingCooling
4x Dominator GT waterblocks 1x EK CPU Supreme HF 2x EK DC 4 Pump  2x EK basic 250ml cylinder reservoirs 
CoolingCoolingCoolingOS
1x HWlabs GTX360 Scythe 3000 rpm 120x38mm 3x Enermax 120mm fans  Windows XP 
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Enermax MaxRevo 1500W Fujitsu Siemens 
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Water-Rig
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Chiller-Rig
(18 items)
 
work
(11 items)
 
CPUMotherboardGraphicsRAM
4770k MSI Z87 Mpower Max Gigabyte GTX 680 SOC Corsair Dominator GT2133 CL9-10-9-24-2T 
RAMRAMHard DriveHard Drive
Corsair Platinum 2400 CL10-12-12-31-2T  Avexir Core Series 2800 CL12-14-14-35-2T OCZ Vertex 3 MaxIOPS  Corsair Force 2 
OSMonitorKeyboardPower
Windows 7, x64 Ultimate BenQ 24" XL2410T (120hz) SteelSeries 6GV2 Silverstone Strider Gold 750w 
CaseMouseMouse PadAudio
CM Stacker 830 SteelSeries Xai Laser RUSE Gaming SteelSeries Logitech G35 
OtherOtherOtherOther
HWlabs Black-Ice SR-1 420 Radiator 3 x Prolimatech 140mm 3 x Silverstone Airpenetrator 141 3x Silverstone 121FM Fans (gfx) 
OtherOtherOtherOther
1x Swifttech MCP35x + MCP35x reservoir  EK Water Blocks Nichel-Acetal Supr. HF CPU EK Water Blocks Copper-Plexi Supr. HF VGA 2m ½" tube 
CPUMotherboardGraphicsRAM
P4 641 Asus Maximus Formula x38 Nvidia Geforce 7300LE Samsung PC5300 
Hard DriveCoolingCoolingCooling
Seagate 8x TECs, 50x50x41mm (288 couple) 35v 2x Phobya Temperature displays Neoprene tube 19/13 
CoolingCoolingCoolingCooling
4x Dominator GT waterblocks 1x EK CPU Supreme HF 2x EK DC 4 Pump  2x EK basic 250ml cylinder reservoirs 
CoolingCoolingCoolingOS
1x HWlabs GTX360 Scythe 3000 rpm 120x38mm 3x Enermax 120mm fans  Windows XP 
PowerCase
Enermax MaxRevo 1500W Fujitsu Siemens 
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post #15 of 15
Quote:
Originally Posted by qwwwizx View Post

I found other solutions. Any opinions?
http://www.zahninc.com/DCDC6350.html
http://www.zahninc.com/DCDC63125F-SU-ADJspecs.html

The specs are all good. Check their price .... biggrin.gif
Obsidian
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OCZ RevoDrive3 X2 OCZ Vertex 4 WD 640GB  Swiftech 360 Radiator 
CoolingCoolingCoolingCooling
MCP 35X pump Swiftech Apogee XT waterblock Foxrena's Water Rack KOC TEC and Fan controller 
CoolingOSMonitorKeyboard
KOC 62mm TEC block Windows 7 Ultimate Dell UltraSharp IPS 27'' 2560x1440 Razor Black Widow Ultimate 
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Obsidian
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CoolingCoolingCoolingCooling
MCP 35X pump Swiftech Apogee XT waterblock Foxrena's Water Rack KOC TEC and Fan controller 
CoolingOSMonitorKeyboard
KOC 62mm TEC block Windows 7 Ultimate Dell UltraSharp IPS 27'' 2560x1440 Razor Black Widow Ultimate 
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