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:
May. 31, 2016
Filed:
Sep. 27, 2012
Tdk Corporation, Tokyo, JP;
Takashi Urano, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A feeding coil circuitfeeds power by wireless from a feeding coil Lto a receiving coil Lbased on a magnetic field resonance phenomenon between the feeding coil Land receiving coil L. A transmission power control circuitsupplies AC power at a drive frequency to the feeding coil Lto make the feeding coil Lfeed the AC power to the receiving coil L. A phase detection circuitmeasures a phase difference between a current phase of the AC power and a voltage phase thereof. The power transmission control circuitadjusts the drive frequency in accordance with the phase difference. A protection circuitadjusts the phase difference in an increasing direction when the current flowing in the feeding coil Lincreases.