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Thread: Power problem I would like some acvice on please.

  1. #1
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    Power problem I would like some acvice on please.

    Hello folks,

    I am having some power problems between my power supply and carputer that I am looking for some input on.

    My carputer is an Advantech single board computer (http://www.advantech.com/products/PC..._1-2SUQSP.aspx)

    My power supply is the Opus 80w DC-DC 5 and 12v psu (http://opussolutions.com/index.php?p=product&id=26)


    Here's the problem:

    In a CarPC environment, it is an intelligent power supply that usually powers up the motherboard. In a typical ATX setup, it is the motherboard that signals for the power supply to turn on.

    My power supply's 5v output is connected to the 5v input on the motherboard. In a conventional ATX setup, when the motherboard receives 5v it begins to power up.

    When my power supply senses +12v at the IGN connector, the +5v output is energized and the motherboard powers on. One problem: The power supply also pulses the power switch simulating someone pressing the ATX power button on the front of a computer chassis.

    Since the motherboard is already booting up with the presense of +5v, this pulse actually shuts off the computer.

    I returned the power supply to opus to have them disable the power-on pulse and they did.

    New problem: If the motherboard's soft ATX power switch header is connected to the power supply (for auto shut-down) the motherboard hangs at POST. If this is disconnected, it boots up fine.

    I'm not sure where to go here and I am hoping someone else has also run into something like this.

    Thanks.

  2. #2
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    Here's what makes it more frustrating:

    My last Advantech SBC had a 4-pin power connector (not ATX). The board would remain powered off even with +5v present until the power supply pulsed the power switch.


    Someone must have a solution - everyone is using an ATX powered motherboard.

  3. #3
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    I'm confused about why you wouldn't simply disconnect the acpi lead and call it a day?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    Quote Originally Posted by Bugbyte View Post
    I'm confused about why you wouldn't simply disconnect the acpi lead and call it a day?
    By ACPI lead you mean the soft power switch connector between the motherboard and power supply?

    Because then I wouldn't have auto shut-down on engine-off.

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    Why not use a relay that holds the ACPI line OPEN when the ignition is on and closes it when you shut the car off. That way, the +5 will start the computer and the ACPI will stop it.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  6. #6
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    Not a bad idea but I'd prefer if it just work as intended

    When I connected a regular power supply to the SBC (via the 20 to 12 pin adapter) it worked fine.

    I think the power supply is screwy.

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