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Avoiding re-boot during car start

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  • Avoiding re-boot during car start

    I'm using DC ATX powersupply, with the "lower end" rated at 9 VDC. Apparently, this is not a low enough rating...

    If the car is off with the PC running, and I start the car, there is too much power draw and the damned thing reboots.

    Is there anything (such as a big-*** cap.) that I can put inline to help prevent this?

    ~m
    PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
    Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
    BC ROCKS!!!

  • #2
    Originally posted by dos4who?:
    <STRONG>

    Is there anything (such as a big-*** cap.) that I can put inline to help prevent this?

    ~m</STRONG>
    Yes!!!!!! If you look at my car start waveform I posted a few days ago, you can see that that is probably what you are up against too!

    Go get yourself a MBR3045 Diode and a 5,000 uf or so cap and hook it up like this

    -----&gt;|------- to power supply
    ...........|
    ...........|
    ..........._
    ...........^ cap
    ...........|
    ...........|
    --------------- gnd
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

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    • #3
      i don't know if this would work, but for car amps there are .5 farad and 1 farad caps so your headlights won't dim. might work???

      Tom

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      • #4
        Jeff, I appreciate your reply but (and I'm sure this is due to no-one's ineptitude but my own) I understand neither the drawing nor the concept. Does the cap actually "bridge" the + and - terminals of the battery? I think I understand that the diode will prevent a short-circuit (correct?) but... well.. I'm lost at that point...

        TIA
        ~m
        PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
        Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
        BC ROCKS!!!

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        • #5
          Another question: will a 5000uF cap actually keep the voltage up for long enough? (about 3 seconds to crank the engine)

          -Miles
          Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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          • #6
            Originally posted by Jeff Mucha:
            <STRONG>

            Yes!!!!!! If you look at my car start waveform I posted a few days ago, you can see that that is probably what you are up against too!

            Go get yourself a MBR3045 Diode and a 5,000 uf or so cap and hook it up like this</STRONG>
            Do you think that something like this would stop an inverter/ATX PSU cutting out? I spose the best way to know would be to try it. I guess I could up the 5000uf to 10000uf or something like that....
            Project - GAME OVER :(

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