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Help connecting ebike charger to USB

Discussion in 'General Electronics Discussion' started by forwhere, Jun 13, 2015.

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  1. forwhere

    forwhere

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    Jun 13, 2015
    I want to connect a USB cord to the battery of my ebike charger. The connector of the ebike in the pictures looks like a male coaxial power connector, but I'm not too sure as it doesn't have the grooves of a coaxial. I'm new to this and have searched all over looking for a connector to connect to USB.

    The dimensions are: head (3mm), inner width (8mm).

    Would appreciate any pointers in the right direction!
    Kay
     

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  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    What voltage does the ebike charger output? I very much doubt it is 5V. An adapter to USB is useless in that case.
     
  3. forwhere

    forwhere

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    Jun 13, 2015
    Hi Harald - thanks for your reply. It's a 42V output for the charger. How would you set up an ebike battery to charge a phone then? I go on long rides and I'm trying to see whether I can do that. Thanks
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,653
    2,694
    Nov 17, 2011
    You will need a voltage regulator that creates 5V from 42V. As this is a rather high voltage difference, a switch-mode regulator is the best option to save energy.
    You can buy off-the-shelf ebike USB chargers (here's an example) that then should come with a fitting socket.
     
    hevans1944 likes this.
  5. forwhere

    forwhere

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    Jun 13, 2015
    Awesome. Thanks.
     
  6. forwhere

    forwhere

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    Jun 13, 2015
    Harald - can we chat on Skype directly? I need more help with this project.
     
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