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Thread: OPUS 90W not able to handle added load?

  1. #1
    Maximum Bitrate LiquidKernel's Avatar
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    Feb 2005
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    OPUS 90W not able to handle added load?

    I have an OPUS 90W setup to power my LCD as well as my carpc, plenty of current room to spare. However, this means that while the carpc is shutting down, the LCD is still on. Not that big of an issue, but I'd rather have it off.

    I put the power of the LCD from the OPUS in series with a normally-open SPDT relay with the coils connected to my car's ACC line. So when I turn off the car, the LCD turns off. Works great, but if I turn on the car again before the carpc is shutting down, the LCD will turn on and the PSU will enable it's over-current protection and shut down!

    Code:
                        ACC
                         |
                         |
    |------| __ 12V _____/ ____ |-----|
    | OPUS |           relay    | LCD |
    |------| __ GND ___________ |-----|
    As you can see, the relay will turn on the LCD once ACC is on. Turning it on while the PSU is already on will kill the PSU.

    Any ideas as how I can battle this?

  2. #2
    Maximum Bitrate LiquidKernel's Avatar
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    I am thinking that a cap to filter out any ripples created by the LCD turning on. But I still think it's the initial draw of the CCFL inverter required to start teh bulb that kills the PSU. Wish I had a nice scope to see the spike.

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