The Apple Pencil 2, which Apple debuted this week, can connect wirelessly to an iPad Pro to pair and charge. And the tech giant has filed for a patent (number 20180314349) for the tech behind this.
The invention, dubbed “capacitive wireless charging system,” is for a wireless power transmission system may include a wireless power transmitting device such as a tablet computer (the new iPad Pro) and a wireless power receiving device such as a computer stylus (the new Apple Pencil). A wireless power transmitting capacitor electrode is located in the tablet, and a wireless power receiving capacitor electrode is located in the Apple Pencil 2.
The transmitting capacitor electrode may be driven by a drive signal having a frequency of 900 MHz or greater to produce wireless power. The wireless power may be transmitted from the iPad Pro electrode to the receiving capacitor electrode on the Apple Pencil 2 via near field capacitive coupling.
