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
First Claim
1. A noncontact electric power feeding apparatus, comprising:
- a resonance element to supply an alternating current (A/C) electric power without contact in accordance with a resonance;
an A/C power source configured to generate the A/C electric power to be supplied to said resonance element; and
an automatic impedance adjusting circuit provided between said A/C power source and said resonance element 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 A/C electric power, the automatic impedance adjusting circuit including a three-port directional coupler coupled between the resonance element and the A/C power source to measure a magnitude of a reflected electric power, the coupling coefficient being determined by the automatic impedance adjusting circuit in accordance with the magnitude of a reflected electric power.
1 Assignment
0 Petitions
Accused Products
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.
14 Citations
9 Claims
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1. A noncontact electric power feeding apparatus, comprising:
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a resonance element to supply an alternating current (A/C) electric power without contact in accordance with a resonance; an A/C power source configured to generate the A/C electric power to be supplied to said resonance element; and an automatic impedance adjusting circuit provided between said A/C power source and said resonance element 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 A/C electric power, the automatic impedance adjusting circuit including a three-port directional coupler coupled between the resonance element and the A/C power source to measure a magnitude of a reflected electric power, the coupling coefficient being determined by the automatic impedance adjusting circuit in accordance with the magnitude of a reflected electric power. - View Dependent Claims (2, 8)
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3. A noncontact electric power receiving apparatus, comprising:
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a resonance element to receive an alternating current (A/C) electric power without contact with an electric power feeding source and in accordance with a resonance of a resonance element of the electric power feeding source; a rectifying circuit to create a direct current (D/C) electric power from the A/C electric power received through said resonance element and to output the D/C electric power; and an automatic impedance adjusting circuit provided between said resonance element and said rectifying circuit to variably control 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 A/C electric power, the automatic impedance adjusting circuit including a three-port directional coupler coupled between the resonance element and the rectifying circuit to measure a magnitude of a reflected electric power, the coupling coefficient being determined by the automatic impedance adjusting circuit in accordance with the magnitude of a reflected electric power. - View Dependent Claims (4, 9)
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5. A noncontact electric power feeding method, comprising:
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measuring a magnitude of a reflected power using a three-port directional coupling coupled between an alternating current (A/C) power source that generates A/C power and an electric power feeding destination of the A/C electric power; determining a coupling coefficient based on the magnitude of the reflected power; and variably controlling an impedance in accordance with the coupling coefficient determined from the magnitude of the reflected power, the coupling coefficient being representative of a coupling between said A/C power source and a resonance element that supplies the A/C electric power from said A/C power source to another electronic apparatus without contacting the other electronic apparatus.
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6. A noncontact electric power receiving method, comprising:
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measuring a magnitude of a reflected power using a three-port directional coupling coupled between a resonance element of an electric power feeding source of an alternating current (A/C) electric power and a rectifying circuit that creates a direct current (D/C) electric power from the A/C electric power received through said resonance element to output the D/C electric power; determining a coupling coefficient based on the magnitude of the reflected power; and variably controlling an impedance in accordance with a magnitude of the coupling coefficient determined from the magnitude of the reflected power, the coupling coefficient being representative of a coupling between the electric power feeding source and the electric power feeding destination that receives the A/C electric power without contact.
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7. A noncontact electric power feeding system, comprising:
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a noncontact electric power feeding apparatus including; a resonance element to supply an (A/C) alternating current electric power without contact and in accordance with a resonance, an A/C power source configured to generate the A/C electric power to be supplied to said resonance element, and an automatic impedance adjusting circuit provided between said A/C power source and said resonance element 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 A/C electric power, the automatic impedance adjusting circuit including a three-port directional coupler coupled between the resonance element and the A/C power source to measure a magnitude of a reflected electric power, the coupling coefficient being determined by the automatic impedance adjusting circuit in accordance with the magnitude of a reflected electric power; and a noncontact electric power receiving apparatus including; a resonance element to receive the A/C electric power without contact and in accordance with a resonance from said resonance element of said noncontact element power feeding apparatus, a rectifying circuit to create a direct current (D/C) electric power from the A/C electric power received through said resonance element and to output the D/C electric power, and an automatic impedance adjusting circuit provided between said resonance element and said rectifying circuit to variably control 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 A/C electric power, the automatic impedance adjusting circuit including a three-port directional coupler coupled between the resonance element and the rectifying circuit to measure a magnitude of a reflected electric power, the coupling coefficient being determined by the automatic impedance adjusting circuit in accordance with the magnitude of a reflected electric power.
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Specification