公开(公告)号：US20190056803A1

公开(公告)日：2019-02-21

申请号：US15680088

申请日：2017-08-17

Applicant: Apple Inc.

Inventor： Michael NUSSBAUM ,  Blake R. MARSHALL ,  Jason P. MARINI ,  Li-Quan TAN

IPC: G06F3/038 ,  G06F3/0354 ,  G06F1/32

CPC classification number: G06F3/0383 ,  G06F1/3259 ,  G06F3/03545 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/046 ,  G06F2203/04106 ,  G06F2203/04108

Abstract: Input device power consumption can be reduced with a magnetic drive system. In some examples, the input device can include a transformer configured to generate a desired high output voltage from logic-level input pulses. In some examples, the distributed capacitance and associated resonance of the transformer can act as a low-pass filter, and can create a relatively clean output waveform from input logic signal waveforms. In some examples, the transformer can be an autotransformer. In some examples, to stabilize an amplitude of the output by sampling the output of the transformer and adjusting the input to the transformer based on the sampled output.