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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 10971952 B1

PDFFull Text
Date of Patent:
Apr. 06, 2021

Filed:

Jan. 20, 2017

Wireless power transfer device

Applicant:

Maxell, Ltd., Kyoto, JP;

Inventors:

Osamu Kawamae, Kyoto, JP;

Katsuei Ichikawa, Tokyo, JP;

Assignee:

MAXELL, LTD., Kyoto, JP;

Attorney:

Mattingly & Malur, PC

Primary Examiner:

Jared Fureman

Assistant Examiner:

Esayas G Yeshaw

Int. Cl.
CPC ...
H02J 5/00 (2016.01); H02J 50/12 (2016.01); H02J 50/80 (2016.01); H02J 50/40 (2016.01); H02J 50/05 (2016.01); H02J 50/60 (2016.01); H02J 7/02 (2016.01);
U.S. Cl.
CPC ...
H02J 50/12 (2016.02); H02J 7/025 (2013.01); H02J 50/05 (2016.02); H02J 50/40 (2016.02); H02J 50/60 (2016.02); H02J 50/80 (2016.02); Y02B 40/00 (2013.01);
Abstract

The present invention improves charging efficiency in a wireless power transfer device. A wireless power transfer device wirelessly transfers power by using inductive coupling to a charging target device placed in the vicinity of a charging pad. The wireless power transfer device includes an amplifier for performing power amplification, a series resonant circuit constituted by a resonant capacitor and a power transfer coil, and a foreign material detection unit for detecting a non-charging device, which is not a charging target, placed in the vicinity of the charging pad. The foreign material detection unit is constituted by a pick-up coil, bandpass filters, detector circuits and a control circuit. The foreign material detection unit detects an IC card which is the non-charging device by a signal component emitted through inductive coupling with the power transfer coil from the device placed in the vicinity of the charging pad when transferring power.

Find Patent Forward Citations

Kawamae, Osamu. (2021). Wireless power transfer device (U.S. Patent No. 10971952). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10971952

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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