公开(公告)号：US20250112501A1

公开(公告)日：2025-04-03

申请号：US18818861

申请日：2024-08-29

Applicant: Apple Inc.

Inventor： Alireza Safaee ,  Sriram Narayanan ,  Srinath Hosur ,  Xing Zhou

IPC: H02J50/12 ,  H04L27/04

Abstract: A wireless power receiver can include a wireless power transfer coil; a rectifier that receives an AC voltage induced in the wireless power transfer coil by a wireless power transmitter and generates a DC output voltage therefrom; load modulation circuitry; and control circuitry that operates the rectifier to power a load coupled thereto and operates the load modulation circuitry to communicate with the wireless power transmitter by selectively altering power drawn from the wireless power transfer coil in accordance with an amplitude shift keying modulation scheme having a plurality of modulation depths.

公开(公告)号：US11449175B2

公开(公告)日：2022-09-20

申请号：US16836789

申请日：2020-03-31

Applicant: Apple Inc.

Inventor： Srinath Hosur ,  Aryan Hazeghi ,  John Stephen Smith

IPC: G06F3/041 ,  G06F3/044

Abstract: In some examples, an input device includes a non-linear component, such as a diode. In response to a drive signal, such as a sinusoidal wave, the non-linear passive input device can produce a non-linear output that includes frequency content at the second and other higher harmonics of the fundamental frequency of the drive signal, for example. In some examples, drive electrodes can be driven with a drive signal having one of two fundamental frequencies such that the frequency of the drive signals are applied in an alternating pattern. The electronic device can sense the signal of the stylus to determine the coarse location of the stylus along the sense electrodes and, based on the frequency content of the received signal, a fine location along the axis of the drive electrodes.