公开(公告)号：US11876439B2

公开(公告)日：2024-01-16

申请号：US17450910

申请日：2021-10-14

Applicant: Apple Inc.

Inventor： Yanhui Xie ,  Asif Hussain ,  Jingdong Chen ,  Zhiyuan Hu

IPC: H02M1/14 ,  H02M1/00 ,  H02M3/04

CPC classification number: H02M1/14 ,  H02M1/0077 ,  H02M3/04

Abstract: A battery powered electronic device can include a battery to power one or more loads, a first DC-DC converter having an input coupled to the battery and an output, and a second DC-DC converter cascaded with the first DC-DC converter and coupled to a second load subject to pulsed operation. The first and second converters may be configured so as to isolate the one or more loads from transients associated with the pulsed operation of the second load. The second converter may have an input coupled to the output of the first converter and an output coupled to the second load. Alternatively, the second converter may be a bidirectional converter having first terminals coupled to the output of the first converter and second terminals coupled to an energy storage device.

公开(公告)号：US20220247232A1

公开(公告)日：2022-08-04

申请号：US17198116

申请日：2021-03-10

Applicant: Apple Inc.

Inventor： Adam L. Schwartz ,  Alireza Safaee ,  Stephen C. Terry ,  Zhiyuan Hu

IPC: H02J50/70 ,  H02J7/02 ,  H02J50/12 ,  H02J50/60 ,  H01F38/14 ,  H01F27/36

Abstract: A wireless charging system having a power transmitter may wirelessly transfer power to a power receiver. Shield saturation, such as saturation of a ferrite structure, in the wireless power receiver may occur under some operating conditions. Saturation can lead to disruptive oscillations in power transfer. The power transmitting may include control circuitry for detecting and mitigating saturation.