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Thread: Strange dc-dc convertor behaviour

  1. #1
    Variable Bitrate
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    Jun 2006
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    Strange dc-dc convertor behaviour

    So my first carpc install is just about in and was well for a few days. Im using a laptop with a dcdc convertor and set the laptop to remain in standby until it gets to about 8%batterypower then hibernate.

    This seemed to work well but got in the car yesterday and lost my entire acc circuit. Checked the fuses and one fuse for my dcdc convertor had blown as had one elsewhere on the acc circuit. Changed the fuses and plugged the convertor back into the laptop but nothing happened, the laptop continued to run on battery.

    The rating of the dcdc convertor is 60w and it produces 19v and 3amp, the laptop psu states 19v 3.42 amp but the laptop itself states input as 19v 3.2 amp so i would have thought the dcdc convertor would provide enough power?

    Is just a function of the fact that when the battery gets really low on the laptop it needs noticably more power to operate and charge the battery? And if so would i be better to set the standby/hibernate threshold alot higher on the battery life?

    Cheers all

  2. #2
    Variable Bitrate
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    It appears on closer inspection that the dc-dc converter is also blowing the fuse when i take the car from acc to start back to acc if the laptop is already running? I will probably have to combine the run/acc signal but wondered why this should blow the fuse?

  3. #3
    Newbie norwegianguy's Avatar
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    bigger is better

    run a bigger wire to the dc-dc and use a bigger fuse, u could also try using a relay to get a acc purely for the dc-dc(relay triggered by acc- power to dc-dc from 12v+)

  4. #4
    Variable Bitrate
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    Surely this isnt the way to solve the problem? Bigger fuse and thicker wire? The wire im using isnt too thin and the fuse is 10amp?

  5. #5
    Newbie norwegianguy's Avatar
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    is the dc-dc the only thing on the fuse? or do you have cd- player, amp etc going on the same line ? u could hook up an ampermeter to the line and tell us the load

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