WIRELESS FEEDING SYSTEM

• US 20120025626A1
• Filed: 07/18/2011
• Published: 02/02/2012
• 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
• Granted Patent: US 9,024,481 B2
• Time in Patent Office: Days
• 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 receiving power transmitted from said feeding device;

wherein said feeding device includes

a power generating section generating the power to be fed, and

a resonant element fed with the power generated by said power generating section,

said power receiving device includes a power receiving element receiving the power transmitted from said feeding device, and supplies power according to the received power to a load, and

at least one of a power propagation path to said resonant element in said feeding device and a received power propagation path in said 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.

2. The wireless feeding system according to claim 1,

wherein said frequency characteristic correcting circuit includes a resonant circuit for frequency characteristic correction and a resonant circuit for feeding, the resonant circuit for feeding being coupled to the resonant circuit for frequency characteristic correction.

3. The wireless feeding system according to claim 1,

wherein said feeding device includes

said power generating section generating the power to be fed,

said frequency characteristic correcting circuit achieving the wider band by expanding the frequency characteristic of said power, and

a feeding element fed with the power whose frequency characteristic is expanded to achieve the wider band by said frequency characteristic correcting circuit, and coupled to said resonant element by electromagnetic induction, and

said resonant element is coupled to said feeding element by electromagnetic induction.

4. The wireless feeding system according to claim 1,

wherein said feeding device includes

said power generating section generating the power to be fed, and

said frequency characteristic correcting circuit achieving the wider band by expanding the frequency characteristic of said power, and

said resonant element is connected to one terminal part of said frequency characteristic correcting circuit by a tap.

5. The wireless feeding system according to claim 1,

wherein said feeding device includes a matching section having a function of impedance matching at a feeding point of the power generated by said power generating section.

6. The wireless feeding system according to claim 1,

wherein said power receiving device includes a matching section having a function of impedance matching at a part of connection of said power to the load of said power receiving element.

7. The wireless feeding system according to claim 6,

wherein frequency is determined by said resonant element, and

a transmission characteristic can be adjusted by strength of coupling, the strength of coupling changing according to a distance between said resonant element on a transmitting side and the power receiving element, and impedance adjustment in said matching section on a power receiving side.