RESONANT TYPE TRANSMISSION POWER SUPPLY DEVICE AND RESONANT TYPE TRANSMISSION POWER SUPPLY SYSTEM
First Claim
1. A resonant type transmission power supply device comprising:
- a pulse input circuit to input a pulse voltage to a transmission antenna at set intervals;
a variable resonance frequency circuit to cause a resonance frequency of said transmission antenna to be variable and perform sweep detection of the resonance frequency when a pulse voltage is inputted by said pulse input circuit;
a frequency characteristic detecting circuit to detect a frequency characteristic of said transmission antenna when the sweep detection of the resonance frequency is performed by said variable resonance frequency circuit;
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 frequency characteristic detecting circuit; and
a power control circuit to reduce or stop supply of electric power to said transmission antenna when a foreign object is detected by said foreign object detecting circuit.
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Accused Products
Abstract
A resonant type transmission power supply device includes a pulse input circuit that inputs a pulse voltage to a transmission antenna at set intervals, a variable resonance frequency circuit that causes the resonance frequency of the transmission antenna to be variable and performs sweep detection of the resonance frequency when a pulse voltage is inputted, a frequency characteristic detecting circuit that detects a frequency characteristic of the transmission antenna when the sweep detection is performed, a foreign object detecting circuit that detects the presence or absence of a foreign object in an electromagnetic field generated from the transmission antenna on the basis of a detection result acquired by the frequency characteristic detecting circuit, and a power control circuit that reduces or stops the supply of electric power to the transmission antenna when a foreign object is detected.
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Citations
7 Claims
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1. A resonant type transmission power supply device comprising:
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a pulse input circuit to input a pulse voltage to a transmission antenna at set intervals; a variable resonance frequency circuit to cause a resonance frequency of said transmission antenna to be variable and perform sweep detection of the resonance frequency when a pulse voltage is inputted by said pulse input circuit; a frequency characteristic detecting circuit to detect a frequency characteristic of said transmission antenna when the sweep detection of the resonance frequency is performed by said variable resonance frequency circuit; 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 frequency characteristic detecting circuit; and a power control circuit to reduce or stop supply of electric power to said transmission antenna when a foreign object is detected by said foreign object detecting circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 one fixed frequency, each of said resonant type transmission power supply devices comprising:
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a pulse input circuit to input a pulse voltage to said corresponding transmission antenna at set intervals; a variable resonance frequency circuit to cause a resonance frequency of said corresponding transmission antenna to be variable and perform sweep detection of the resonance frequency when a pulse voltage is inputted by said pulse input circuit; a frequency characteristic detecting circuit to detect a frequency characteristic of said corresponding transmission antenna when the sweep detection of the resonance frequency is performed by said variable resonance frequency circuit; 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 frequency characteristic detecting circuit; a position detecting circuit to, when a foreign object is detected by said foreign object detecting circuit, detect a position of said foreign object on a basis of a detection result acquired by each of said frequency characteristic detecting circuits; and a plurality of power control circuits each to reduce or stop supply of electric power to said corresponding transmission antenna on a basis of the position of the foreign object detected by said position detecting circuit.
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Specification