NONCONTACT ELECTRIC POWER FEEDING APPARATUS, NONCONTACT ELECTRIC POWER RECEIVING APPARATUS, NONCONTACT ELECTRIC POWER FEEDING METHOD, NONCONTACT ELECTRIC POWER RECEIVING METHOD, AND NONCONTACT ELECTRIC POWER FEEDING SYSTEM

• US 20110049995A1
• Filed: 07/30/2010
• Published: 03/03/2011
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: HASHIGUCHI, Takaaki
• Granted Patent: US 8,912,685 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

Disclosed herein is a noncontact electric power feeding apparatus, including: a resonance element for supplying an alternative current electric power in a noncontact style in accordance with a resonance; an alternative current power source portion configured to generate an alternative current electric power to be supplied to said resonance element; and impedance adjusting portion provided between said alternative current power source portion and said resonance element and configured to variably control an impedance in accordance with a coupling coefficient between said noncontact electric power feeding apparatus and an electric power feeding destination of the alternative current electric power.

Claims

1. A noncontact electric power feeding apparatus, comprising:

a resonance element for supplying an alternative current electric power in a noncontact style in accordance with a resonance;

an alternative current power source portion configured to generate an alternative current electric power to be supplied to said resonance element; and

impedance adjusting means provided between said alternative current power source portion and said resonance element for variably controlling an impedance in accordance with a coupling coefficient between said noncontact electric power feeding apparatus and an electric power feeding destination of the alternative current electric power.

2. The noncontact electric power feeding apparatus according to claim 1, wherein said impedance adjusting means comprises:

adjusting means composed of one of or both of a variable inductor and a variable capacitor;

detecting means for detecting a magnitude of a reflected electric power which is changed in accordance with the coupling coefficient; and

control means for controlling said adjusting means in accordance with the magnitude of the reflected electric power detected by said detecting means.

3. A noncontact electric power receiving apparatus, comprising:

a resonance element for receiving an alternative current electric power in a noncontact style in accordance with a resonance from a resonance element of an electric power feeding source;

a rectifying circuit for creating a direct current electric power from the alternative current electric power received through said resonance element to output the direct current electric power thus created; and

impedance adjusting means provided between said resonance element and said rectifying circuit for variably controlling an impedance in accordance with a magnitude of a coupling coefficient between said noncontact electric power receiving apparatus and said electric power feeding source of the alternative current electric power.

4. The noncontact electric power receiving apparatus according to claim 3, wherein said impedance adjusting means comprises:

adjusting means composed of either one of or both of a variable inductor and a variable capacitor;

detecting means for detecting a magnitude of a reflected electric power which is changed in accordance with the coupling coefficient; and

control means for controlling said adjusting means in accordance with the magnitude of the reflected electric power detected by said detecting means.

5. A noncontact electric power feeding method, comprising the step of:

variably controlling an impedance in accordance with a coupling coefficient between an alternative current power source portion for generating an alternative current electric power, and an electric power feeding destination of the alternative current electric power between said alternative current power source portion and a resonance element for supplying the alternative current electric power from said alternative current power source portion to another electronic apparatus in a noncontact style.

6. A noncontact electric power receiving method, comprising the step of:

variably controlling an impedance in accordance with a magnitude of a coupling coefficient between an electric power feeding source of an alternative current electric power and an electric power feeding destination of the alternative current electric power between a resonance element for receiving the alternative current electric power in a noncontact style in accordance with a resonance from a resonance element of said electric power feeding source, and a rectifying circuit for creating a direct current electric power from the alternative current electric power received through said resonance element to output the direct current electric power thus created.

7. A noncontact electric power feeding system, comprising:

a noncontact electric power feeding apparatus including

a resonance element for supplying an alternative current electric power in a noncontact style in accordance with a resonance;

an alternative current power source portion configured to generate an alternative current electric power to be supplied to said resonance element; and

impedance adjusting means provided between said alternative current power source portion and said resonance element for variably controlling an impedance in accordance with a coupling coefficient between said noncontact electric power feeding apparatus and an electric power feeding destination of the alternative current electric power; and

a noncontact electric power receiving apparatus including

a resonance element for receiving the alternative current electric power in a noncontact style in accordance with a resonance from said resonance element of said noncontact element power feeding apparatus;

a rectifying circuit for creating a direct current electric power from the alternative current electric power received through said resonance element to output the direct current electric power thus created; and

impedance adjusting means provided between said resonance element and said rectifying circuit for variably controlling an impedance in accordance with a magnitude of a coupling coefficient between said noncontact electric power receiving apparatus and said electric power feeding source of the alternative current electric power.