ELECTRICAL POWER TRANSMISSION SYSTEM AND ELECTRICAL POWER OUTPUT DEVICE

• US 20110316349A1
• Filed: 03/10/2010
• Published: 12/29/2011
• Est. Priority Date: 03/17/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hashiguchi, Takaaki, Wada, Hirotsugu, Fujimaki, Kenichi
• Granted Patent: US 9,490,638 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

In an electrical power transmission system according to the present invention, a frequency generator outputs electrical power of an electrical signal having approximately the same frequency component as a resonant frequency of a resonant element to the resonant element via a driven element. The resonant element is an element having impedance and capacitance and generates a magnetic field by the electrical signal from the frequency generator. A magnetic field coupling circuit is a circuit having the same resonant frequency as the resonant element and becomes coupled by magnetic field resonance with the resonant element. The magnetic field coupling circuit causes magnetic field coupling even with another resonant element and transmits electrical power from the resonant element to the other resonant element. The other resonant element outputs electrical power transmitted through the magnetic field coupling circuit to a rectifier circuit via a driven element.

Claims

1. An electrical power transmission system, comprising:

a power supply device including a first resonant element having inductance and capacitance, and a frequency generator that generates electrical power of an electrical signal having approximately the same frequency component as a resonant frequency decided by the inductance and the capacitance and supplies the generated electrical signal to the first resonant element;

a magnetic field coupling circuit that becomes coupled by magnetic field resonance with the first resonant element; and

a power receiving device including a second resonant element that receives electrical power from the power supply device by magnetic field resonance with the magnetic field coupling circuit.

2. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit has approximately the same resonant frequency as the resonant frequency decided by the inductance and the capacitance of the first resonant element.

3. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit generates a magnetic field on approximately the same line as magnetic field directions of magnetic fields generated by the first and second resonant elements.

4. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit generates a magnetic field approximately in parallel to magnetic field directions of magnetic fields generated by the first and second resonant elements.

5. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit is positioned at a midpoint of a distance between the first and second resonant elements.

6. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit includes a plurality of resonant elements having inductance and capacitance.

7. The electrical power transmission system according to claim 1, wherein the power receiving device receives electrical power from the power supply device by magnetic field resonance with the first resonant element or the magnetic field coupling circuit.

8. An electrical power output device, comprising:

a resonant element having inductance and capacitance;

a frequency generator that generates electrical power of an electrical signal having approximately the same frequency component as a resonant frequency decided by the inductance and the capacitance and supplies the generated electrical signal to the resonant element; and

a plurality of resonant elements having approximately the same resonant frequency as the resonant frequency of the resonant element.