Electrical power transmission system and electrical power output device

• US 9,490,638 B2
• Filed: 03/10/2010
• Issued: 11/08/2016
• 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
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Barnett, Joel
• Application Number:
  US13/255,589
• Publication Number:
  US 20110316349A1
• Time in Patent Office: 2,435 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H02J 5/005 with inductive power transfer for charging H02J7/025
• 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

A power transmission system having a first resonant element with a resonant frequency, a signal generator that generates an electrical power signal with a predetermined frequency that is the same as the resonant frequency of the first resonator, and a driven element that supplies the electrical power signal to the first resonator via magnetic field resonance coupling. A second resonator having a resonant frequency approximately the same as that of the first resonator can be positioned to receive the power from the first resonator. A magnetic coupling circuit can be magnetic field resonance couple to the first and second resonators for transferring the electrical power signal between them.

Claims

1. An electrical power transmission system, comprising:

a power supply device including (a) a first resonant element having inductance and capacitance and that resonates at a first resonant frequency determined by the inductance and capacitance, (b) a frequency generator that generates an electrical power signal having a frequency that is the same as or approximately the same as the first resonant frequency determined by the inductance and the capacitance of the first resonant element, and (c) a first driven element that transmits the electrical power signal to the first resonant element by magnetic field resonance coupling;

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

a power receiving device including (a) a second resonant element that includes an inductance and a capacitance and that resonates at a second resonant frequency determined by the inductance and capacitance, the second resonant element receiving electrical power from the power supply device via the magnetic field coupling circuit by magnetic field resonance coupling with the magnetic field coupling circuit, and (b) a second driven element that receives the electrical power signal from the second resonant element by magnetic field resonance coupling,

wherein,

the first and second resonant elements have parallel magnetic fields,

the magnetic field coupling circuit has a magnetic field that is orthogonal to the magnetic fields of the first and second resonant elements,

the magnetic field coupling circuit is located midway between the first and second resonant elements, and

at least the first resonant element and the magnetic field coupling circuit are located within a same device.

2. The electrical power transmission system according to claim 1, wherein the magnetic field coupling circuit has a resonant frequency that is approximately the same as the resonant frequency of the first resonant element.

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

4. The electrical power transmission system of claim 1, wherein the magnetic field coupling circuit has a resonant frequency that is the same as the resonant frequency of the first resonant element.

5. The electrical power transmission system of claim 1, wherein each of the magnetic field coupling circuit and the second resonant element has a resonant frequency that is approximately the same as the resonant frequency of the first resonant element.

6. The electrical power transmission system of claim 1, wherein each of the magnetic field coupling circuit and the second resonant element has a resonant frequency that is the same as the resonant frequency of the first resonant element.

7. The electrical power transmission system of claim 1, wherein the first and second resonators are separated by no more than a distance of 10 cm to 80 cm.

8. The electrical power transmission system of claim 7, wherein each of the first and second resonators and the magnetic field coupling circuit comprises a coil with a radius of 10 cm.

9. The electrical power transmission system of claim 1, wherein each of the first and second resonators and the magnetic field coupling circuit comprises a coil with a radius of 10 cm.