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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 11342793 B1

PDFFull Text
Date of Patent:
May. 24, 2022

Filed:

Jul. 22, 2020

Detection of device removal from a surface of a multi-coil wireless charging device

Applicant:

Aira, Inc., Chandler, AZ (US);

Inventors:

Eric Heindel Goodchild, Phoenix, AZ (US);

John Winters, Chandler, AZ (US);

James Scott, Chandler, AZ (US);

Assignee:

AIRA, INC., Chand, AZ (US);

Attorneys:

Loza & Loza, LLP

Anthony Smyth

Primary Examiner:

Rexford N Barnie

Assistant Examiner:

Rasem Mourad

Int. Cl.
CPC ...
H01F 37/00 (2006.01); H01F 38/00 (2006.01); H02J 50/12 (2016.01); G01L 1/22 (2006.01); G01P 15/00 (2006.01); G01V 3/08 (2006.01); G01V 8/12 (2006.01); G01V 1/00 (2006.01); H02J 7/04 (2006.01); H02J 50/90 (2016.01); H02J 7/00 (2006.01); G01R 19/12 (2006.01); H02J 50/23 (2016.01); H02J 50/40 (2016.01);
U.S. Cl.
CPC ...
H02J 50/12 (2016.02); G01L 1/22 (2013.01); G01P 15/00 (2013.01); G01R 19/12 (2013.01); G01V 1/00 (2013.01); G01V 3/081 (2013.01); G01V 8/12 (2013.01); H02J 7/0047 (2013.01); H02J 7/04 (2013.01); H02J 50/23 (2016.02); H02J 50/40 (2016.02); H02J 50/402 (2020.01); H02J 50/90 (2016.02); H02J 7/00718 (2020.01); H02J 7/007184 (2020.01);
Abstract

Systems, methods and apparatus for wireless charging are disclosed. A charging device has a plurality of charging cells provided on a charging surface, a charging circuit and a controller. The controller may be configured to cause the charging circuit to provide a charging current to a resonant circuit when a receiving device is placed on the charging device, detect a change or rate of change in voltage or current level associated with the resonant circuit or a change or rate of change in power transferred to the receiving device and determine that the receiving device has been removed from the charging device when the change or rate of the change in voltage or current level or change or rate of change in power transferred to the receiving device exceeds a threshold value.

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