WIRELESS POWER TRANSMITTING APPARATUS AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20160118809A1
• Filed: 10/08/2015
• Published: 04/28/2016
• Est. Priority Date: 10/27/2014
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: YOSHIDA, Fumio, YAMAGUCHI, Satoshi
• Granted Patent: US 9,876,396 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A wireless power transmitting apparatus includes: a loop conductor for power transmission having an inductance; an inverter circuit configured to receive a DC voltage, convert the DC voltage into an AC voltage, and apply the AC voltage to the loop conductor; a capacitor connected between one end of the loop conductor and at least one end of the inverter circuit; and a metal layer covering one of the faces formed by the loop conductor farthest from a power receiving apparatus.

Claims

1. A wireless power transmitting apparatus comprising:

a loop conductor for power transmission having an inductance;

an inverter circuit configured to receive a DC voltage, convert the DC voltage into an AC voltage, and apply the AC voltage to the loop conductor;

a capacitor connected between one end of the loop conductor and at least one end of the inverter circuit; and

a metal layer covering one of the faces formed by the loop conductor which is opposite to the face opposed to a power receiving apparatus.

2. The wireless power transmitting apparatus according to claim 1,

wherein the metal layer is formed of aluminum, copper, brass, bronze, or zinc.

3. The wireless power transmitting apparatus according to claim 1,

wherein a distance between the metal layer and the loop conductor is substantially identical to a maximum distance between a center of an area surrounded by the loop conductor and the loop conductor.

4. The wireless power transmitting apparatus according to claim 1,

wherein the loop conductor includes a concave portion that is at least partly indented toward an inside of a periphery of a loop formation area of the loop conductor and has a total length larger than a peripheral length of the loop formation area.

5. A wireless power transmission system formed of the wireless power transmitting apparatus according to claim 1 and a power receiving apparatus configured to receive power as a result of being coupled to the wireless power transmitting apparatus through a magnetic field.

6. The wireless power transmission system according to claim 5,

wherein d1≧

d2, d1 being a height of the loop conductor above the metal layer and d2 being a distance between the loop conductor and a power receiving coil of the power receiving apparatus.