公开(公告)号：US20190052102A1

公开(公告)日：2019-02-14

申请号：US15840172

申请日：2017-12-13

Applicant: Apple Inc.

Inventor： Weiyun Chen ,  Stephen C. Terry ,  Yongxuan Hu

IPC: H02J7/00 ,  H02J50/12 ,  H02J7/02

Abstract: Disclosed herein are a method, system and non-transitory program storage device for protecting a power converter from overvoltage conditions in wireless power transfer. In some embodiments, the power converter may use a controllable current sink to discharge an output voltage of the power converter's receiver so as to maintain the output voltage below an overvoltage threshold. In some embodiments, a peak current of the current sink may be controlled as a function of the output voltage. In some embodiments, the current sink may be enabled and/or disabled according to a duty cycle and a frequency, wherein the frequency may be maintained beyond an audible range. In some embodiments, the power converter may bypass the receiver responsive to the output voltage exceeding a limit, thus effectively disabling the power transfer from a transmitter to the receiver.