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Splicing in an inductive charger

post #1 of 10
Thread Starter 
I have a Thermaltake Toughpower XT 775w PSU. Regardless of how you may feel about the power supply, I'm hoping someone here has the know-how to help me complete a little mod I'm attempting.

I recently installed a powermat inductive charger in my computer case (mod link with pictures here). It runs on 18v, and in that thread it was suggested that I could wire the charger to +12V and -5V (instead of ground), which would give the charger 17V, which should be enough for it to work correctly. I have two questions.

1. Is this a correct assumption
2. If so, can someone point out exactly which wires I would need to splice?

I've done some cable splicing before, so I'm not too worried about messing anything up in that regard. Understandably though, I'd like a little more clarification before I start hacking away at my power supply.

Thanks for any advice or words of wisdom/warning you might have to offer.
Lian Li
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Lian Li
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post #2 of 10
Your PSU doesn't have a -5V rail. That was removed from the ATX12V specification in 2003. Even if you did, it would be generated by an IC with a very, very low current capacity that would probably fry if you tried to ground too much current through it.
post #3 of 10
Thread Starter 
So it can't be done at all?
Lian Li
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AMD FX-8320 ASUS M5A99X EVO AM3+ AMD 990X XFX 7970 Double Dissipation XFX 7970 Double Dissipation 
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Lian Li
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post #4 of 10
Not without having a -5v rail... which you don't. hey phea would using the +5v rail work though?
post #5 of 10
No, that would make +7V.
post #6 of 10
this math is hurting my head
post #7 of 10
Quote:
Originally Posted by pon View Post
this math is hurting my head
...

12 - 5 = 7

12 - (-5) = 17
post #8 of 10
right, I see.
post #9 of 10
Quote:
Originally Posted by Sturdius View Post
So it can't be done at all?
You could buy or build a DC-DC step-up converter to convert the +12V to +18V.
post #10 of 10
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
You could buy or build a DC-DC step-up converter to convert the +12V to +18V.
So something like this? Is there something else you would recommend? And then how would I wire it up in the end? Sorry I have so many questions, but I really appreciate the help.
Lian Li
(21 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8320 ASUS M5A99X EVO AM3+ AMD 990X XFX 7970 Double Dissipation XFX 7970 Double Dissipation 
RAMHard DriveHard DriveHard Drive
16gb G Skill Ripjaws SanDisk Extreme SDSSDX-240G-G25 Seagate ST375064 Seagate ST2000DM 
Hard DriveHard DriveOptical DriveCooling
SAMSUNG HD103SI Seagate ST3400633AS Lite-On Lightscribe DVD RW HR-02 Macho 
OSMonitorMonitorMonitor
Windows 7 ASUS VS239H-P ASUS VS239H-P ASUS VS239H-P 
KeyboardPowerCaseMouse
Das Keyboard S Thermaltake Toughpower XT 775W Lian Li PC-A70F Razer Mamba 
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Func Surface 
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Lian Li
(21 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8320 ASUS M5A99X EVO AM3+ AMD 990X XFX 7970 Double Dissipation XFX 7970 Double Dissipation 
RAMHard DriveHard DriveHard Drive
16gb G Skill Ripjaws SanDisk Extreme SDSSDX-240G-G25 Seagate ST375064 Seagate ST2000DM 
Hard DriveHard DriveOptical DriveCooling
SAMSUNG HD103SI Seagate ST3400633AS Lite-On Lightscribe DVD RW HR-02 Macho 
OSMonitorMonitorMonitor
Windows 7 ASUS VS239H-P ASUS VS239H-P ASUS VS239H-P 
KeyboardPowerCaseMouse
Das Keyboard S Thermaltake Toughpower XT 775W Lian Li PC-A70F Razer Mamba 
Mouse Pad
Func Surface 
  hide details  
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