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Making my own charging setup

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  • Making my own charging setup

    We are using atm a chinese AMmeter which is working just fine for Apple and Samsung devices, normal charge and fast charge (+2A)
    I would like to make my own Ammeter setup and i bought a AMmeter and connected a original Apple Charger and original cables.
    The Ammeter is working but fast charge is disabled. The phone is only charging with a speed of 0.9A.

    Using the pictures in attachment
    USB input/power supply
    VBUS is connected to thick red and yellow cable
    Black cable connected to AMmeter thick black cable

    USB output/load
    VBUS is connected to thick red and yellow cable
    Black cable connected to AMmeter thick red cable

    USB input D- directly connected to USB output D-
    USB input D+ directly connected to USB output D+


    What can i do the enable Apple fast charge?
    Last picture i found on the web. Maybe the solution is in D- and D+?
    I could use another dc power supply to create USB input with resistors to test but a rather use original Apple chargers. Just as i'm now using with the chinese Ammeter.

    When a iPhone XR is connected below 50% battery
    D- is 2.2V
    D+ is 2.2V

    Attached Files

  • #2
    I've never tried to do anything like this, so I don't have any relevant advice. I know that some aftermarket chargers are unable to communicate on the data lines and can not, for example, charge a stone dead iPad that require a conversation in order to negotiate charger current. Since you are using OEM charger and cable then that's not the issue, but the usb ammeter is. If this was a problem I was trying to solve, I'd get another ammeter and have a conversation with the chinese supplier about whether or not it supports fast charging. As a plan B, I'd consider dissecting the working ammeter to see how it is different from the one that can't fast charge.

    Let us know what you find.

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