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.

公开(公告)号：US09882407B2

公开(公告)日：2018-01-30

申请号：US14845846

申请日：2015-09-04

Applicant: Apple Inc.

Inventor： Jose V. Santos ,  Yongxuan Hu ,  Steve Sterz ,  Rob Hoyt ,  Soundararajan Manthiri

IPC: H02J7/00 ,  H02J7/04

CPC classification number: H02J7/007 ,  H02J7/0006 ,  H02J7/0021 ,  H02J7/0026 ,  H02J7/0031 ,  H02J7/0036 ,  H02J7/0047 ,  H02J7/0068 ,  H02J7/045 ,  H02J2007/0001

Abstract: The disclosed embodiments provide a system that manages use of a battery in a portable electronic device. During operation, the system attempts to regulate a voltage on a battery terminal in the portable electronic device to a first voltage level. Upon identifying an inability to regulate the voltage on the battery terminal to the first voltage level during a first detection period, the system detects a presence of the battery in the portable electronic device.

公开(公告)号：US09350232B2

公开(公告)日：2016-05-24

申请号：US13854805

申请日：2013-04-01

Applicant: Apple Inc.

Inventor： Yongxuan Hu ,  Keong W. Kam ,  Shimon Elkayam ,  Susan R. Schen

IPC: H02M3/338 ,  H02M1/44 ,  H02M3/158 ,  H02M3/335

CPC classification number: H02M1/44 ,  H02M3/158 ,  H02M3/33507

Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.

Abstract translation: 描述了具有降低的电磁干扰（EMI）的开关式电源。 该开关式电源包括在与扩频调制信号相关的带宽上连续地对控制信号进行频率调制的调制电路。 通过对开关电源中的控制信号进行频率调制，与调制的开关信号相关联的频谱内容在带宽上均匀分布，从而降低EMI。