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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10277043 B1

PDFFull Text
Date of Patent:
Apr. 30, 2019

Filed:

Sep. 08, 2017

Wireless charging mats for portable electronic devices

Applicant:

Apple Inc., Cupertino, CA (US);

Inventors:

Christopher S. Graham, San Francisco, CA (US);

Demetrios B. Karanikos, San Francisco, CA (US);

Darshan R. Kasar, San Francisco, CA (US);

Paul J. Thompson, Mountain View, CA (US);

Eric S. Jol, San Jose, CA (US);

Grant S. Haug, Mountain View, CA (US);

Karl Ruben F. Larsson, Los Altos, CA (US);

Stefan A. Kowalski, Cupertino, CA (US);

Assignee:

Apple Inc., Cupertino, CA (US);

Attorney:

Kilpatrick Townsend & Stockton LLP

Primary Examiner:

David V Henze-Gongola

Int. Cl.
CPC ...
H02J 5/00 (2016.01); H02J 7/00 (2006.01); H02J 7/02 (2016.01); H04B 5/00 (2006.01); H05K 9/00 (2006.01); H01F 27/28 (2006.01); H01F 27/32 (2006.01); H02J 50/10 (2016.01); H02J 50/40 (2016.01); H02J 50/60 (2016.01); H02J 50/70 (2016.01);
U.S. Cl.
CPC ...
H02J 7/0042 (2013.01); H01F 27/288 (2013.01); H01F 27/325 (2013.01); H02J 5/005 (2013.01); H02J 7/025 (2013.01); H02J 50/10 (2016.02); H02J 50/40 (2016.02); H02J 50/60 (2016.02); H02J 50/70 (2016.02); H04B 5/0037 (2013.01); H04B 5/0075 (2013.01); H04B 5/0087 (2013.01); H05K 9/0007 (2013.01);
Abstract

Embodiments describe a wireless charging device including a housing having a charging surface and first and second walls defining an interior cavity, and a transmitter coil arrangement disposed within the interior cavity and configured to generate a time-varying magnetic flux and an electric field during wireless power transfer, where each of the plurality of transmitter coils has a central axis positioned a lateral distance away from the central axes of all other transmitter coils of the plurality of transmitter coils. The wireless charging mat also includes an electromagnetic shield positioned between the transmitter coil arrangement and the first wall, an interconnection structure positioned within the interior cavity between the transmitter coil arrangement and the second wall, and a ferromagnetic shield positioned within the interior cavity between the transmitter coil arrangement and the interconnection structure, the ferromagnetic shield is configured to redirect the magnetic flux away from the interconnection structure.

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