logo

For the Inventor, By the Inventor

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 11515731 B1

PDFFull Text
Date of Patent:
Nov. 29, 2022

Filed:

Nov. 28, 2019

Contactless power transmission system for transmitting power from power transmitter apparatus to power receiver apparatus, and detecting foreign object

Applicant:

Omron Corporation, Kyoto, JP;

Inventors:

Shingo Nagaoka, Kizugawa, JP;

Taichi Mishima, Kizugawa, JP;

Takeshi Uematsu, Tokyo, JP;

Assignee:

OMRON CORPORATION, Kyoto, JP;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Pinping Sun

Int. Cl.
CPC ...
H02J 50/12 (2016.01); H02J 50/80 (2016.01); H02J 50/40 (2016.01); H02J 50/60 (2016.01); B60L 53/12 (2019.01); H01F 27/24 (2006.01); H01F 38/14 (2006.01);
U.S. Cl.
CPC ...
H02J 50/12 (2016.02); B60L 53/12 (2019.02); H02J 50/40 (2016.02); H02J 50/60 (2016.02); H02J 50/80 (2016.02); H01F 27/24 (2013.01); H01F 38/14 (2013.01);
Abstract

A first detector detects a value of a current or voltage generated by an auxiliary coil. A second detector detects a value of a current flowing through a power transmitting coil. A coupling coefficient estimator estimates a first coupling coefficient between the power transmitting coil and a power receiving coil, based on the value of the current or voltage generated by the auxiliary coil, and estimates a second coupling coefficient between the power transmitting coil and the power receiving coil, based on the value of the current flowing through the power transmitting coil. A control circuit controls a power supply circuit to stop power transmission to a power receiver apparatus when a difference between the coupling coefficients is greater than a threshold.

Find Patent Forward Citations

Loading…