Notes on reverse charging and hybrid displays on the iPhone 12


Since the first Apple Watch, inductive charging has found its way into Apple’s product portfolio, and reverse charging would be the next step.

© The  Apple Watch has been able to do it since 2015, the iPhone since 2017, the iPad and Macbook not yet – inductive charging via a charging coil and without a cable. However, there are several indications that Apple wants to expand and expand the feature. On the one hand, the US network authority FCC found retrospective tests of an iPhone 12 in the documents. © The  researchers measured the magnetic and electrical fields of the device and noted in a note: “In addition to being able to be charged by a permanently installed wireless charger , the iPhones from 2020 can charge other accessories with the charging frequency of 360 kHz. ©

 The  devices are currently only adapted to Apple accessories that have not yet been released. ” ©

 The  corresponding application can be found here on the FCC portal, the document with the measurements can be downloaded here. ©

 The  testers probably noted this because the measured frequency of 360 kHz is outside the bandwidth of the Qi standard, Qi devices use frequencies between 110 and 300 kHz. However, the function in the iPhone 12 is deactivated, but it is quite possible that Apple can activate it with a software update. Interesting: ©

 The  Apple Watch has a charging frequency that roughly corresponds to that measured by FFC on the iPhone 12: 326.5 kHz.

A current patent dated January 5th shows that Apple has been researching reverse charging for a long time. It describes a technology that can be used to charge several suitable devices with one charging cable: by stacking them on top of each other. © The  patent not only enables iPhones to charge other Apple devices such as an Apple Watch or Airpods, but also iPads and Macbooks. In extreme cases, the developers assume that you can charge an iPad and an iPhone on a Macbook and an Apple Watch on the same iPhone (see lead picture). In this case, even daisy chaining, i.e. transfer of energy via two or three instances, is possible.

Apple developers see the standard case for reverse charging as placing the device to be charged on the back of the device that is supposed to deliver the energy. But in combination with the iPad and iPhone, it is even possible to place the iPhone on the iPad display and thus tap the energy wirelessly. © The  next step sounds almost like a Star Trek application: If the iPhone is placed on the iPad screen, the green tick confirms that the charging process has started. ©

 The  iPad can still be used. Either the apps slide from the covered area into the visible area of ​​the iPad, or the iPhone takes over the display of the covered iPad apps, a hybrid screen, so to speak.

Hybrid display of the iPhone and iPad when charging backwards.


Hybrid display of the iPhone and iPad when charging backwards.

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Notes reverse charging hybrid displays iPhone


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