Wireless feeding system

• US 9,024,481 B2
• Filed: 07/18/2011
• Issued: 05/05/2015
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Komiyama, Shinji
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Mourad, Rasem
• Application Number:
  US13/185,087
• Publication Number:
  US 20120025626A1
• Time in Patent Office: 1,387 Days
• Field of Search: 307/104
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence

Abstract

The present disclosure provides a wireless feeding system including: a feeding device; and a power receiving device receiving power transmitted from the feeding device; wherein the feeding device includes a power generating section generating the power to be fed, and a resonant element fed with the power generated by the power generating section, the power receiving device includes a power receiving element receiving the power transmitted from the feeding device, and supplies power according to the received power to a load, and at least one of a power propagation path to the resonant element in the feeding device and a received power propagation path in the power receiving device has a frequency characteristic correcting circuit achieving a wider band by expanding a frequency characteristic while maintaining a Q-value as high sharpness of resonance of the power.

Claims

1. A wireless feeding system comprising:

a feeding device; and

a power receiving device configured to receive power transmitted from the feeding device,

wherein,

(1) the feeding device includes

(a) a power generating section configured to generate the power to be fed,

(b) a resonant element fed with the power generated by the power generating section and configured to transmit the power to the power receiving device, and

(c) a frequency characteristic correcting circuit separate from the resonant element and coupled on a power propagation path between the power generating section and the resonant element, the frequency characteristic circuit including (i) a first resonant circuit configured to perform frequency characteristic correction and (ii) a second resonant circuit configured to perform feeding, the first resonant circuit and the second resonant circuit being coupled to each other via a common inductance or a common capacitance, and

(2) the power receiving device includes a power receiving element configured to receive the power transmitted from the feeding device, and to supply the received power to a load,

wherein,

the first resonant circuit of the frequency characteristic circuit comprises a first inductor and a first capacitor, the first inductor being connected directly between a first node and a second node, the first capacitor being connected directly between a third node and a fourth node, the first, second, third, and fourth nodes being separate from each other,

the second resonant circuit comprises a second inductor and a second capacitor that are separate from the first inductor and the first capacitor of the first resonant circuit, the second inductor being connected directly between the second node and a fifth node, the second capacitor being connected directly between the fourth node and a sixth node, the fifth and sixth nodes being separate from each other and from the first, second, third, and fourth nodes, and

the common inductance or the common capacitance is connected directly between the second node and the fourth node.

2. The wireless feeding system according to claim 1, wherein the feeding device further includes a feeding element coupled between the frequency characteristic correcting circuit and the resonant element, the feeding element coupled to the resonant element by electromagnetic induction.

3. The wireless feeding system according to claim 1, wherein the feeding device further includes a matching section configured to provide impedance matching at a feeding point of the power generated by the power generating section.

4. The wireless feeding system according to claim 1, wherein the power receiving device further includes a matching section between the power receiving element and the load, and configured to provide impedance matching to the load.

5. The wireless feeding system according to claim 4, wherein:

the resonant element on a transmitting side and the power receiving element on a receiving side are disposed within a given distance from each other, the given distance being in accordance with a desired strength of coupling between the resonant element and the power receiving element, and

the matching section is configured to provide an impedance adjustment on the power receiving side.

6. The wireless feeding system according to claim 5, wherein the resonant element on the transmitting side is a single multi-turn loop coil and the power receiving element on the power receiving side is a single single-turn loop coil.

7. The wireless feeding system according to claim 1, wherein the first resonant circuit and the second resonant circuit are coupled to each other via the common inductance.

8. The wireless feeding system according to claim 1, wherein the first resonant circuit and the second resonant circuit are coupled to each other via the common capacitance.