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. 15, 2018
Filed:
May. 23, 2012
Kengo Maikawa, Kawasaki, JP;
Hiroshi Tanaka, Atsugi, JP;
Tomoya Imazu, Yokohama, JP;
NISSAN MOTOR CO., LTD., Yokohama-shi, JP;
Abstract
A contactless electric power supply deviceto charge a batteryof a vehicle includes a power transmitting circuithaving a power transmitting coiland a charging circuithaving a power receiving coil. An electric power is transmitted from power transmitting coilto power receiving coilin a contactless manner. When the vehicle approaches power supply device, a trial power supply in which a electric power transmission through a minute electric power is carried out is executed and a power transmission efficiency from power transmitting coilto power receiving coilis estimated on a basis of a current flowing through power transmitting circuit. From this power transmission efficiency, a determination of whether power receiving coilfalls in a range in which batteryis chargeable with respect to power transmitting coilis made.