USB micro plug alternatives?

Discussion in 'The Projects Forum' started by Skfir, Dec 23, 2013.

  1. Skfir

    Thread Starter Active Member

    Aug 19, 2010
    135
    4
    Hello guyz, could you please help me with one delicate question? The thing is, I have been developing a device, which has quite a miniature size and it operates from a 12v battery, which needs to be charged occasionally. I tried to find a suitable receptacle. Since ordinary circular are too big I thought about using something like micro USB. Works fine and the size is very small. But the idea is, I am afraid that some silly user may plug it in to his computer and burn everything. So is there any connector and a receptacle on the Earth, which is not bigger, than a micro USB, but is not micro USB?
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,061
    3,836
    If you have room for it, you could add a DC/DC step up converter to your circuit so you can charge from the very common 5V micro USB? This allows USB charging too.
     
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  3. inwo

    Well-Known Member

    Nov 7, 2013
    2,435
    315
    Are even the mini coaxial plugs too big?

    2.35mm od
     
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  4. inwo

    Well-Known Member

    Nov 7, 2013
    2,435
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    What size will work?

    Micro usb ~2mm X 7mm

    Molex has a simple two circuit header plug. ~5mm X 6mm
    Some of the mini-sized Chinese test equipment uses similar.
     
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  5. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    Add a diode then nothing can go wrong, you just need a slightly higher voltage while charging.
     
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  6. Skfir

    Thread Starter Active Member

    Aug 19, 2010
    135
    4
    Thank you for your answers guyz!!!
    Merry Christmas!
     
  7. Skfir

    Thread Starter Active Member

    Aug 19, 2010
    135
    4
    Step up is a very good idea, I just have to figure out if the room permits.
     
  8. Skfir

    Thread Starter Active Member

    Aug 19, 2010
    135
    4
    I decided to use an "ideal diode", found this one - LTC4358 the only one I managed to find with such high voltages. Just decided to post here, perhaps somebody else may have need in such a device.
     
    THE_RB likes this.
  9. Skfir

    Thread Starter Active Member

    Aug 19, 2010
    135
    4
    found by the way, one connector, in case anybody needs - almost as small as microusb, 3A rating - MQ172-3PA
     
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