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Thread: Powering a USB hub with a 12v car battery

  1. #1
    Variable Bitrate rizaydog's Avatar
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    Powering a USB hub with a 12v car battery

    My system is based on an HP laptop witch only has 1 USB port. So I had to purchase a hub to connect everything. Up until now, everything has been powered by the one usb port and working fine. I just got a wireless kb and an external dvd rom case. I am sure I will run into power issues now.

    My hub came with an ac plug with 5v output. I read a lot of posts on this issue, but most draw power from there pc. With the laptop, I don't think I have that option. So I purchased one of these:
    [media]http://i202.photobucket.com/albums/aa115/rizaydog/DOTHXXXCCSP4_it_L.jpg[/media]

    At the bottom of the pic, it has a powered usb plug. I don't need the other dc ports on this unit. So I thought about just taking it apart to get my power. Then just cut the ac plug off my hub's power supply and soldering it to the usb port.

    There should only be one power wire attatched to that usb port right?

    Is this a good solution?

  2. #2
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    I did do something similar and ran into a problem, I powered a USB Hub from a unit like this but the problem is while it was outputting 5v there weren't enough Ampres so while it did power it, it wasnt enough to actually power the external DVD drive I had, as the Carputer power supply isn't an option the only thing that I can think of that I read briefly about on here is a POL. Not entirely sure how it all works but thats the way I have seen to do it.

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    Newbie CabrioBob's Avatar
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  4. #4
    Variable Bitrate FPeter's Avatar
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    Quote Originally Posted by Morpheous_88 View Post
    I did do something similar and ran into a problem, I powered a USB Hub from a unit like this but the problem is while it was outputting 5v there weren't enough Ampres so while it did power it, it wasnt enough to actually power the external DVD drive I had, as the Carputer power supply isn't an option the only thing that I can think of that I read briefly about on here is a POL. Not entirely sure how it all works but thats the way I have seen to do it.
    yes, there is no heatsink on this stuff, looks 1-200 mA max... its enough to run a mp3 player, enough for a mouse, keyboard or touchpad, but not enough for several USB port

    i tried LM317/338 ICs, but they looks unstable under low amps, a 317 killed my other circuit. this might be a single occurrence, but there is a much better alternative, the LM2941



    the 1A is enough for several smaller device, or 1 HDD, 1 ODD, and this chip can be turned on/off remotely. you can connect it directly to the battery (with fuse!!!), and turn on/off with a wire from the carpc power supply, and put more circuit to parallel for each - or some combined USB port...
    "case": Skoda Superb Elegance 1.8T
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  5. #5
    Variable Bitrate rizaydog's Avatar
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    Thanks for the help guys. Im gonna do some more research on these solutions and let you know what I go with. Thanks again.

  6. #6
    Maximum Bitrate bes51659's Avatar
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    This is what you need.

    Minimal power loss and it will turn off when the USB from the lap is turned off.

    Well, that is what I would use anyway.

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