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.:
Date of Patent:
Dec. 29, 2020
Filed:
Apr. 01, 2019
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Sander Vocke, Auckland, NZ;
Tom Vocke, Auckland, NZ;
Assignee:
Apple Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J 50/60 (2016.01); H02J 50/12 (2016.01);
U.S. Cl.
CPC ...
H02J 50/60 (2016.02); H02J 50/12 (2016.02);
Abstract
A method for determining the presence of a foreign object in an inductive power transfer field in which control circuitry of an inductive power system performs the steps of: providing power to a direct current to alternating current converter; providing power from the converter to a transmitter coil in the inductive power transfer field; waiting for the current in the transmitter coil to stabilize; estimating the reactive power in the transmitter coil; estimating the real power in the transmitter coil; and using the estimated reactive power and estimated real power to determine whether a foreign object is present.