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:
Jan. 09, 2018
Filed:
Nov. 18, 2015
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Kazuya Kato, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Nagaokakyo-Shi, Kyoto-Fu, JP;
Abstract
A power transmission device applies a alternating-current voltage to an active electrode OPPOSING an active electrode of a power reception device with a gap therebetween, and to a passive electrode OPPOSING a passive electrode of the power reception device with a gap therebetween and transmits power via electric field coupling. The power transmission device includes a controller that monitors a voltage applied to the passive electrode. If a change in the voltage per unit time exceeds a threshold, the controller determines that a metal foreign object has become interposed between the active electrodes and a user has touched the metal foreign object, and stops the transmission of power to the power reception device. Thus, a power transmission device and a wireless power transmission system are provided that are capable of preventing with certainty a malfunction due to a foreign object when a foreign object has become interposed between electrodes.