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Powerbank (AC/USB Charging)

Discussion in 'General Electronics Discussion' started by vick5821, Jan 15, 2014.

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  1. vick5821


    Jan 22, 2012
    Dear all,

    Recently, I got myself a powerbank for charging my smartphone. I realised that it sometimes provide AC charging mode but when I change the other USB cable, it changed to USB charging mode which is much slower.

    Anyone knows what's the reason behind this ? How the USB cable would change the mode ?

    Thanks !
  2. mahone


    Dec 21, 2013
    you say it 'sometimes' provides ac, are you certain it isn't faulty. I would check before plugging my phone or anything else into it.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    USB charging port of smartphones, tablets and the like often use coded USB ports. The charger has a defined set of resistors connected between the USB pins. The device detects the code and knows that it can draw more than the standard 500mA from the charger via thsi SUB cable.

    See this article.
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