Wireless QI 7.5 charging question

Discussion in 'iPhone Accessories' started by Zaft, Feb 16, 2019.

  1. Zaft macrumors 68040

    Zaft

    Joined:
    Jun 16, 2009
    Location:
    Brooklyn, NY
    #1
    Im looking to get a QI wireless car charger for my XS Max. Do I have to get a OC 3.0 adapter for 7.5w or just a standard one?
     
  2. I7guy macrumors P6

    I7guy

    Joined:
    Nov 30, 2013
    Location:
    Gotta be in it to win it
    #2
    Think you need the 3.0 but someone might chime in differently. Due to efficiency losses you need more than 7.5 watts.
     
  3. BugeyeSTI macrumors 68030

    BugeyeSTI

    Joined:
    Aug 19, 2017
    Location:
    Arizona
  4. TheIntruder macrumors 6502a

    TheIntruder

    Joined:
    Jul 2, 2008
    #4
    All the wireless chargers I've come across require a wall adapter capable of 9V or 12V output (...meaning QC) to charge at greater than the base 5W Qi profile.

    5V can only go so far, and USB was only originally designed to support 500mA. It's been upped and cajoled over the years to go over 2A, but the voltage constant became a limiting factor.

    Enter USB PD, which breaks free from that constraint (5/9/12/15/20V, up to 5A), but I've yet to see a charger specify PD instead of QC to satisfy the higher energy demands. Throw more coils into the mix and they go higher.

    Should be interesting to see how many coils AirPower utilizes, and how much power it will demand. If it ever arrives.
     
  5. Zaft thread starter macrumors 68040

    Zaft

    Joined:
    Jun 16, 2009
    Location:
    Brooklyn, NY

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