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question about UPS Battery (12 volt), DC/DC converter and PC motherboard.

Discussion in 'Electronic Basics' started by Jack Snodgrass, Dec 30, 2003.

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  1. I want to run a Mini-ITX PC Motherboard off of a 12 volt
    UPS Battery ( for a robotic platform )

    The motherboard is currently connected to a DC/DC converter
    and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
    takes the 12volt DC in and produces the +-5, +-12 that the PC
    motherboard expects.

    If I just replace the 12 volt power brick with a 12 volt
    UPS battery ( fully charged ) am I going to run into problems?

    Any info would be appreciated.

    jack
     
  2. Guest

    |
    | I want to run a Mini-ITX PC Motherboard off of a 12 volt
    | UPS Battery ( for a robotic platform )
    |
    | The motherboard is currently connected to a DC/DC converter
    | and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
    | takes the 12volt DC in and produces the +-5, +-12 that the PC
    | motherboard expects.
    |
    | If I just replace the 12 volt power brick with a 12 volt
    | UPS battery ( fully charged ) am I going to run into problems?

    I would presume that as the 12 volt battery starts to lose its charge, you
    get a voltage drop, and that will at least affect the +-12v output from the
    DC/DC converter, depending on how it is designed (maybe it can keep the +-12
    at 12v even when the input is 10v). You might want to find out how the BIOS
    reads CPU voltages in the motherboard and add those tests in your robotic
    software (imagine the robot stopping and going to look for an outlet to feed
    on to recharge when it gets low).
     
  3. my initial test failed... no smoke, but no output either.
    I think that the putput from the UPS Battery was out of spec
    with the DC-DC converter I was using. I need to do some
    more research on cleaning up the incoming 12 volts.

    jack
     
  4. Did you put the mobo back on the PS to make sure you
    didn't fry it on the battery? Was the UPS battery _really_
    at 12V, or the usual lead-acid 13.6V or so? If the mobo
    still runs on the PS it may have just temporarily locked up
    due to overvoltage. What's the Vin spec for the mobo?
    Is there a collection of electronic malapropisms?

    Mark L. "Eye niver mispelt anyfink" Fergerson
     
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