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12VDC ATX psu for PC

Discussion in 'Electrical Engineering' started by WalkTall, May 16, 2005.

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  1. WalkTall

    WalkTall Guest

    Can anyone perhaps please point me to a circuit diagram for a ATX PSU for a
    PC with a 12VDC supply voltage(+/-300W)? I've got a 12VDC backup system,
    solar and wind, and do not want to use an inverter. The 3 & 5V rails are not
    a problem, but the-12V, +12V seems to be. Should I step up the 12V to 24V
    with an DC-DC converter and then split it to 12V-/0/12V+? Will this be more
    efficient than a 12VDC to 220VAC Inverter?
    Thanx in advance,
  2. I've seen 12VDC PC power supplies for sale at computer fairs.
    I think the target audience are people who put a PC in their
    car as the basis for their car audio system.

    All rails are regenerated, as the swing on a car supply from
    less than 10V during starting to 14.5V charging is far too
    much for any PC rail to sustain directly.
  3. WalkTall

    WalkTall Guest

    Thanx all,
    I think that Palindr?me idea will be the best solution for me.
    I've got a couple of ATX PSU's lying around to experiment with. (Any
    circuits for dc to dc converters?) Should it be a 12VDC to 220VDC inverter
    or can I tap in somewhere on the PSU PCB to supply it with a lower voltage,
    say 24VDC? (I'm not so clued-up on Switchmode Power Supplies)
    I've got grid power on site, so the supply is more for power failures than
    anything else, but I would like to make it as efficient as possible.
    My Solar/wind system is 12VDC, charging a bank of batteries. Mostly used to
    power lights, my PC and a 12VDC capable TV, the essentials ;-) for now, but
    I would like to use it more permanently in the future as I expand it.
    Money IS a problem, so I would rather build than buy.

    PS - Apologies for the late post, but I only go online about twice a day.
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