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Thread: DC>DC converter for USB power

  1. #1
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    DC>DC converter for USB power

    I'm trying to hook up my Nexus inductive charger for in car use:
    https://play.google.com/store/device..._charger&hl=en

    problem is, the little sucker is very particular about it's power supply. The included 110v wall charger output is rated as 5V 1.8A When I plug directly into my nexus 5, battery monitor shows charging at ~1.1A (normally discharges at 0.3-0.6A when unplugged) I've tried to replace it with several DC>DC converters from amazon including these two:
    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

    Both have outputs rated at 5VDC 3A, yet neither provides enough current to power the charger. When I plug directly into the phone, Battery monitor shows they are only charging at 0.3-0.8A, presumably not enough to power the inductive charger. Can anyone explain this or offer any tips?

    So far the only way I have gotten it to function is using the factory wall charger with a 110v inverter, I'd really like to find a better solution though, since It makes no sense to me to go from 12VDC>110VAC>5VDC, plus the wall charger and inverter wont fit above the headliner (where I hoped to mount), and the inverter further has a cooling fan so its even more of a pain to mount.

    any ideas for getting >1.8A through a Micro USB cable?

  2. #2
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    Could you not make your own USB cable? I would suspect that it could well be the thickness of the wires in the cable.. Prob a microprocessor limiting current

  3. #3
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    You can use ANY Qi charger. The Nexus 7 (2013 version) is designed to use the generic Qi charger. You do NOT have to use the Nexus chargers.

    If you do a quick search you can find MANY Qi chargers that can be run in an automobile. So if you have too much more trouble just use your charger in the house and buy a new charger that will work in your vehicle that was designed to work there.

    Rodney

  4. #4
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    Quote Originally Posted by looneyfitter View Post
    Could you not make your own USB cable? I would suspect that it could well be the thickness of the wires in the cable.. Prob a microprocessor limiting current
    I've used several different configurations. Some of the DC>DC inverters have a USB port, so I've been able to test even with the cable that came with the charger, doesn't seem to make a difference.

    On an inverter that has a two wire output, I've cut and spliced USB cables onto them, both with and without the data pins shorted (a method that some devices use to determine current draw), again no difference.

  5. #5
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    Quote Originally Posted by redheadedrod View Post
    You can use ANY Qi charger. The Nexus 7 (2013 version) is designed to use the generic Qi charger. You do NOT have to use the Nexus chargers.

    If you do a quick search you can find MANY Qi chargers that can be run in an automobile. So if you have too much more trouble just use your charger in the house and buy a new charger that will work in your vehicle that was designed to work there.

    Rodney
    yeah, but the nexus charger has magnets so that your device just snaps into place vs having to clip it into some type of holder. I've already designed and 3d printed a custom attachment for my rammount also so I've invested quite a bit into making this work already, I'd rather not have to take an inferior route if possible.

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