Wireless power receiving apparatus

• US 9,831,688 B2
• Filed: 08/19/2014
• Issued: 11/28/2017
• Est. Priority Date: 08/28/2013
• Status: Active Grant

• Current Assignee: Sony Group Corp.
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakano, Hiroaki, Terashima, Toru, Bunsen, Keigo, Kozakai, Osamu, Fujimaki, Kenichi
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): SHIAO, DAVID A
• Application Number:
  US14/895,174
• Publication Number:
  US 20160164302A1
• Time in Patent Office: 1,197 Days
• CPC Class Codes: G01V 3/10 using induction coils
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 9/00 Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
• CPC Class Codes: H04L 25/0272 Arrangements for coupling to multiple lines, e.g. for differential transmission
• CPC Class Codes: H04L 25/028 Arrangements specific to the transmitter end
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03878 Line equalisers; line build-out devices
• CPC Class Codes: H04L 25/4917 using multilevel codes
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A power feeding apparatus is provided. The power feeding apparatus includes a power feeding unit configured to supply electric power to a power receiving apparatus through a magnetic field; a measuring unit configured to measure an electric characteristic value and to generate a measurement value; a power receiving unit configured to provide a set value; and a foreign substance detection unit configured to detect a foreign substance in the magnetic field based on the set value and the measurement value. A power receiving apparatus, a power feeding system, and a method of controlling power feeding are also provided.

Claims

1. A power receiving apparatus comprising:

a power receiving circuit configured to receive electric power supplied by a power feeding apparatus through a magnetic field between the power feeding apparatus and the power receiving apparatus; and

a transmitting circuit configured to transmit a set value to the power feeding apparatus,

wherein the set value is determined from a Q factor of a power feeding coil of the power feeding apparatus, the Q factor is calculated when there is no foreign substance in a magnetic field between the power feeding apparatus and the power receiving apparatus, and the set value is stored in the power receiving apparatus.

2. The power receiving apparatus of claim 1, wherein the set value is based on a quantity of conductors provided in the power receiving apparatus.

3. The power receiving apparatus of claim 1, wherein the set value is based on a surface area of a conductor provided in the power receiving apparatus.

4. The power receiving apparatus of claim 1, wherein the set value is based on a change of an electric characteristic value due to an arrangement of the power receiving apparatus in the magnetic field between the power feeding apparatus and the power receiving apparatus.

5. The power receiving apparatus of claim 4, wherein an inductance of the power feeding apparatus is the electric characteristic value.

6. The power receiving apparatus of claim 1, wherein the transmitting circuit is configured to transmit the set value after the power receiving circuit receives the electric power having a first electric energy.

7. The power receiving apparatus of claim 6, wherein the power feeding apparatus is configured to use the set value to determine a presence of a foreign object between the power feeding apparatus and the power receiving apparatus or an absence of the foreign object between the power feeding apparatus and the power receiving apparatus.

8. The power receiving apparatus of claim 7, wherein the power receiving circuit is configured to receive the electric power having a second electric energy after the power feeding apparatus determines the absence of the foreign object between the power feeding apparatus and the power receiving apparatus.

9. The power receiving apparatus of claim 8, wherein the second electric energy is higher than the first electric energy.