CONTACTLESS ELECTRIC POWER RECEIVING APPARATUS, CONTACTLESS ELECTRIC POWER TRANSMITTING APPARATUS, CONTACTLESS ELECTRIC POWER FEEDING SYSTEM, AND VEHICLE
First Claim
1. An electric power receiving apparatus for receiving electric power in a contactless manner from an electric power transmitting apparatus, said electric power receiving apparatus comprising:
- a self-resonant coil configured to receive electric power in a contactless manner from said electric power transmitting apparatus;
a variable capacitor connected to said self-resonant coil and having a capacitance variable within a prescribed variable range; and
a controller for controlling the capacitance of said variable capacitor, whereinsaid variable capacitor is designed to have the capacitance that is set greater than a median value of said variable range, when said electric power transmitting apparatus and said electric power receiving apparatus have respective resonance frequencies approximately identical to each other in a case where a distance between said electric power transmitting apparatus and said electric power receiving apparatus is equal to a prescribed reference distance.
1 Assignment
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Accused Products
Abstract
In a contactless power feeding system using a resonance method, an electric power receiving apparatus or an electric power transmitting apparatus is connected to a self-resonant coil and includes a capacitor having a variable capacitance. When electromagnetic resonance occurs at a prescribed frequency determined by the electric power transmitting apparatus, the capacitance of the capacitor is adjusted so as to maximize the electric power transmission efficiency during electric power feeding. Accordingly, deterioration in transmission efficiency can be suppressed even when the distance between the secondary self-resonant coil included in the electric power receiving apparatus and the primary self-resonant coil included in the electric power transmitting apparatus changes from a reference distance at the time of design.
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Citations
18 Claims
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1. An electric power receiving apparatus for receiving electric power in a contactless manner from an electric power transmitting apparatus, said electric power receiving apparatus comprising:
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a self-resonant coil configured to receive electric power in a contactless manner from said electric power transmitting apparatus; a variable capacitor connected to said self-resonant coil and having a capacitance variable within a prescribed variable range; and a controller for controlling the capacitance of said variable capacitor, wherein said variable capacitor is designed to have the capacitance that is set greater than a median value of said variable range, when said electric power transmitting apparatus and said electric power receiving apparatus have respective resonance frequencies approximately identical to each other in a case where a distance between said electric power transmitting apparatus and said electric power receiving apparatus is equal to a prescribed reference distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric power receiving apparatus for receiving electric power in a contactless manner from an electric power transmitting apparatus, said electric power receiving apparatus comprising:
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a self-resonant coil configured to receive electric power in a contactless manner from said electric power transmitting apparatus; a variable capacitor connected to said self-resonant coil and having a capacitance variable within a prescribed variable range; and a controller for controlling the capacitance of said variable capacitor, wherein said variable capacitor is designed to have the capacitance that is set, when said electric power transmitting apparatus and said electric power receiving apparatus have respective resonance frequencies approximately identical to each other in a case where a distance between said electric power transmitting apparatus and said electric power receiving apparatus is equal to a prescribed reference distance, such that a variable range in a direction in which said distance is shorter than said reference distance is greater than a variable range in a direction in which said distance is greater than said reference distance.
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10. An electric power transmitting apparatus for transmitting electric power in a contactless manner to an electric power receiving apparatus, said electric power transmitting apparatus comprising:
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a self-resonant coil configured to transmit electric power supplied from a power supply apparatus in a contactless manner to said electric power receiving apparatus; a variable capacitor connected to said self-resonant coil and having a capacitance variable within a prescribed variable range; and a controller for controlling the capacitance of said variable capacitor, wherein said variable capacitor is designed to have the capacitance that is set greater than a median value of said variable range, when said electric power transmitting apparatus and said electric power receiving apparatus have respective resonance frequencies approximately identical to each other in a case where a distance between said electric power transmitting apparatus and said electric power receiving apparatus is equal to a prescribed reference distance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An electric power transmitting apparatus for transmitting electric power in a contactless manner to an electric power receiving apparatus, said electric power transmitting apparatus comprising:
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a self-resonant coil configured to transmit electric power supplied from a power supply apparatus in a contactless manner to said electric power receiving apparatus; a variable capacitor connected to said self-resonant coil and having a capacitance variable within a prescribed variable range; and a controller for controlling the capacitance of said variable capacitor wherein said variable capacitor is designed to have the capacitance that is set, when said electric power transmitting apparatus and said electric power receiving apparatus have respective resonance frequencies approximately identical to each other in a case where a distance between said electric power transmitting apparatus and said electric power receiving apparatus is equal to a prescribed reference distance, such that a variable range in a direction in which said distance is shorter than said reference distance is greater than a variable range in a direction in which said distance is greater than said reference distance.
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Specification