METHOD FOR DETECTING METAL FOREIGN OBJECT IN CONTACTLESS POWER SUPPLY SYSTEM, CONTACTLESS POWER SUPPLY DEVICE, POWER RECEPTION DEVICE, AND CONTACTLESS POWER SUPPLY SYSTEM
First Claim
1. A method for detecting a metal foreign object in a contactless power supply system including a contactless power supply device and a power reception device, wherein the contactless power supply device includes at least one power supply area and a primary coil and a primary authentication coil, which correspond to the power supply area, and wherein the power reception device is arranged in an electric appliance, which includes at least one power reception area, and includes a secondary coil and a secondary authentication coil, which correspond to the power reception area, the method comprising:
- transmitting an authentication oscillating signal from the primary authentication coil;
generating an authentication signal with the secondary authentication coil in response to the authentication oscillating signal;
after the authentication signal is received by the primary authentication coil and authenticated, generating secondary power at the secondary coil with a power transmission oscillating signal generated by the primary coil;
detecting whether or not a metal foreign object is present between the primary coil and the secondary coil based on the power transmission oscillating signal from the primary coil; and
detecting whether or not a metal foreign object is present between the primary authentication coil and the secondary authentication coil based on the authentication oscillating signal from the primary authentication coil, whereinthe primary coil and the primary authentication coil are arranged in the power supply area at different locations, andthe secondary coil and the secondary authentication coil are arranged in the power reception area at different locations.
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Accused Products
Abstract
A contactless power supply system includes a power supply areas, each provided with a primary coil and a primary authentication coil. The primary coil and primary authentication coil are arranged at different locations. An electric appliance includes a power reception area provided with a secondary coil and a secondary authentication coil. The secondary coil and the secondary verification coil are arranged at different locations. The presence of a metal foreign object is detected between the primary coil and secondary coil based on a transmission oscillation signal generated by the primary coil, and the presence of a metal foreign object is detected between the primary authentication coil and secondary authentication coil based on an authentication oscillation signal generated by the primary authentication coil.
38 Citations
17 Claims
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1. A method for detecting a metal foreign object in a contactless power supply system including a contactless power supply device and a power reception device, wherein the contactless power supply device includes at least one power supply area and a primary coil and a primary authentication coil, which correspond to the power supply area, and wherein the power reception device is arranged in an electric appliance, which includes at least one power reception area, and includes a secondary coil and a secondary authentication coil, which correspond to the power reception area, the method comprising:
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transmitting an authentication oscillating signal from the primary authentication coil; generating an authentication signal with the secondary authentication coil in response to the authentication oscillating signal; after the authentication signal is received by the primary authentication coil and authenticated, generating secondary power at the secondary coil with a power transmission oscillating signal generated by the primary coil; detecting whether or not a metal foreign object is present between the primary coil and the secondary coil based on the power transmission oscillating signal from the primary coil; and detecting whether or not a metal foreign object is present between the primary authentication coil and the secondary authentication coil based on the authentication oscillating signal from the primary authentication coil, wherein the primary coil and the primary authentication coil are arranged in the power supply area at different locations, and the secondary coil and the secondary authentication coil are arranged in the power reception area at different locations. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A contactless power supply device for use with a power reception device including a secondary coil, which generates secondary power in response to a power transmission oscillating signal, and a secondary authentication coil that generates an authentication signal in response to an authentication oscillating signal, the contactless power supply device comprising:
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at least one power supply area; a primary coil, which generates the power transmission oscillating signal, and a primary authentication coil, which generates the authentication oscillating signal, wherein the primary coil and the primary authentication coil correspond to the power supply area, a center location of the primary coil and a center location of the primary authentication coil differ from each other in the power supply area; a first envelope detection circuit that converts a power transmission load modulation signal into a first load modulation signal by detecting an envelope of the power transmission load modulation signal when the primary coil receives the power transmission load modulation signal reflecting a variation in a magnetic flux between the primary coil and the secondary coil resulting from the power transmission oscillating signal generated by the primary coil; a second envelope detection circuit that converts an authentication load modulation signal into a second load modulation signal by detecting an envelope of the authentication load modulation signal when the primary authentication coil receives the authentication load modulation signal reflecting a variation in a magnetic flux between the primary authentication coil and the secondary authentication coil resulting from the authentication oscillating signal generated by the primary authentication coil; and a system controller that determines whether or not a metal foreign object is present in the power supply area based on the first load modulation signal, which is provided from the first envelope detection circuit, and the second load modulation signal, which is provided from the second envelope detection circuit. - View Dependent Claims (9, 10, 11, 12)
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13. A power reception device for use with a contactless power supply device including a primary coil, which generates a power transmission oscillating signal, and a primary authentication coil, which generates an authentication oscillating signal, wherein the power reception device is arranged in an electric appliance including at least one power reception area, the power reception device comprising:
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a secondary coil and a secondary authentication coil that correspond to the power reception area, wherein the secondary authentication coil transmits an authentication signal to the primary authentication coil in response to the authentication oscillating signal generated by the primary authentication coil, the secondary coil generates secondary power with the power transmission oscillating signal from the primary coil, and the secondary coil and the secondary authentication coil are arranged in the power reception area at different locations; a first modulation wave signal generation circuit that generates a first modulation wave signal from the power transmission oscillating signal received by the secondary coil, wherein the first modulation wave signal reflects a variation in a magnetic flux between the primary coil and the secondary coil; a first load modulation signal generation circuit that generates a power transmission load modulation signal by modulating the power transmission oscillating signal with the first modulation wave signal; a second modulation wave signal generation circuit that generates a second modulation wave signal from the authentication oscillating signal received by the secondary authentication coil, wherein the second modulation wave signal reflects a variation in a magnetic flux between the primary authentication coil and the secondary authentication coil; and a second load modulation signal generation circuit generating an authentication load modulation signal by modulating the authentication oscillating signal with the second modulation wave signal. - View Dependent Claims (14, 15, 16)
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17. A contactless power supply system comprising:
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an electric appliance including at least one power reception area and a power reception device; and a contactless power supply device, wherein the contactless power supply device includes at least one power supply area, a primary coil, which corresponds to the power supply area and generates a power transmission oscillating signal, and a primary authentication coil, which corresponds to the power supply area and generates an authentication oscillating signal, the power reception device includes a secondary coil, which corresponds to the power reception area and generates secondary power in response to the power transmission oscillating signal, and a secondary authentication coil, which corresponds to the power reception area and generates an authentication signal in response to the authentication oscillating signal, the primary coil and the primary authentication coil are arranged in the power supply area at different locations, and the secondary coil and the secondary authentication coil are arranged in the power reception area at different locations, the contactless power supply device includes a first envelope detection circuit that converts a power transmission load modulation signal into a first load modulation signal by detecting an envelope of the power transmission load modulation signal when the primary coil receives the power transmission load modulation signal reflecting a variation in a magnetic flux between the primary coil and the secondary coil resulting from the power transmission oscillating signal generated by the primary coil, a second envelope detection circuit converting an authentication load modulation signal into a second load modulation signal by detecting an envelope of the authentication load modulation signal when the primary authentication coil receives the authentication load modulation signal reflecting a variation in a magnetic flux between the primary authentication coil and the secondary authentication coil resulting from the authentication oscillating signal generated by the primary authentication coil, and a system controller that determines whether or not a metal foreign object is present in the power supply area based on the first load modulation signal provided from the first envelope detection circuit and the second load modulation signal provided from the second envelope detection circuit, and the power reception device includes a first modulation wave signal generation circuit that generates a first modulation wave signal from the power transmission oscillating signal received by the secondary coil, wherein the first modulation wave signal reflects a variation in a magnetic flux between the primary coil and the secondary coil, a first load modulation signal generation circuit that generates the power transmission load modulation signal by modulating the power transmission oscillating signal with the first modulation wave signal, a second modulation wave signal generation circuit generating a second modulation wave signal from the authentication oscillating signal received by the secondary authentication coil, and a second load modulation signal generation circuit generating the authentication load modulation signal by modulating the authentication oscillating signal with the second modulation wave signal.
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Specification