Resonant type transmission power supply device and resonant type transmission power supply system
First Claim
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1. A resonant type transmission power supply device comprising:
- a transmission power state detecting circuit to detect a transmission power state of a transmission antenna;
a foreign object detecting circuit to detect presence or absence of a foreign object in an electromagnetic field generated from said transmission antenna on a basis of a detection result acquired by said transmission power state detecting circuit; and
a power control circuit to reduce supply of electric power to said transmission antenna when a foreign object is detected to be a magnetic object and stop supply of electric power to said transmission antenna when a foreign object is detected to be a dielectric object.
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Abstract
Disclosed is a resonant type transmission power supply device including a transmission power state detecting circuit 11 to detect a transmission power state of a transmission antenna 2, a foreign object detecting circuit 124 to detect the presence or absence of a foreign object in an electromagnetic field generated from the transmission antenna 2 on the basis of a detection result acquired by the transmission power state detecting circuit 11, and a power control circuit 125 to reduce or stop the supply of electric power to the transmission antenna 2 when foreign object is detected by the foreign object detecting circuit 124.
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Citations
6 Claims
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1. A resonant type transmission power supply device comprising:
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a transmission power state detecting circuit to detect a transmission power state of a transmission antenna; a foreign object detecting circuit to detect presence or absence of a foreign object in an electromagnetic field generated from said transmission antenna on a basis of a detection result acquired by said transmission power state detecting circuit; and a power control circuit to reduce supply of electric power to said transmission antenna when a foreign object is detected to be a magnetic object and stop supply of electric power to said transmission antenna when a foreign object is detected to be a dielectric object. - View Dependent Claims (2, 3, 4, 5)
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6. A resonant type transmission power supply system provided with a plurality of resonant type transmission power supply devices each of that controls supply of electric power to a corresponding one of transmission antennas, in which said transmission antennas operate at different fixed frequencies, respectively, each of said resonant type transmission power supply devices comprising:
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a transmission power state detecting circuit to detect a transmission power state of said corresponding transmission antenna; a foreign object detecting circuit to detect presence or absence of a foreign object in an electromagnetic field generated from said corresponding transmission antenna on a basis of a detection result acquired by said transmission power state detecting circuit; and a power control circuit to, when a foreign object is detected by said foreign object detecting circuit, determine a type of the foreign object on a basis of both the fixed frequency of each of said plurality of transmission antennas and a detection result acquired by each of said transmission power state detecting circuits, wherein the power control circuit reduces supply of electric power to said corresponding transmission antenna when the foreign object is detected to be a magnetic body, and stops supply of electric power to said corresponding transmission antenna when the foreign object is detected to be a dielectric body.
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Specification