Resonant frequency control method, electric power transmitting device, electric power receiving device in magnetic resonant type power transmission system
First Claim
1. A resonant frequency control method in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, the resonant frequency control method comprising:
- detecting a phase of a voltage supplied to the power transmitting coil and a phase of a current that flows in the power transmitting coil or the power receiving coil; and
conforming a phase difference between the detected phase of the voltage and the detected phase of the current to a target value by varying a resonant frequency of a resonant circuit including the power transmitting coil or a resonant circuit including the power receiving coil.
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Accused Products
Abstract
In a resonant frequency control method in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, a high-speed, accurate and real-time adjustment of the resonant frequency of a coil is realized. The phase of a voltage supplied to a power transmitting coil and the phase of a current that flows in the power transmitting coil or a power receiving coil is detected and the resonant frequency of the power transmitting coil or the power receiving coil is varied such that the phase difference between them becomes a target value.
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Citations
16 Claims
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1. A resonant frequency control method in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, the resonant frequency control method comprising:
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detecting a phase of a voltage supplied to the power transmitting coil and a phase of a current that flows in the power transmitting coil or the power receiving coil; and conforming a phase difference between the detected phase of the voltage and the detected phase of the current to a target value by varying a resonant frequency of a resonant circuit including the power transmitting coil or a resonant circuit including the power receiving coil. - View Dependent Claims (2, 3, 4, 5)
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6. A magnetic field resonant type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, the magnetic field resonant type power transmission system comprising:
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a phase detection unit configured to detect a phase of a voltage supplied to the power transmitting coil and a phase of a current that flows in the power transmitting coil or the power receiving coil; and a resonant frequency control unit configured to conform a phase difference between the detected phase of the voltage and the detected phase of the current becomes a target value by varying a resonant frequency of a resonant circuit including the power transmitting coil or a resonant circuit including the power receiving coil.
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7. A power transmission device in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonant, the power transmission device comprising:
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a power transmitting phase detection unit configured to detect a phase of a voltage supplied to the power transmitting coil and a phase of a current that flows in the power transmitting coil; and a power transmitting resonant frequency control unit configured to conform a phase difference between the detected phase of the voltage and the detected phase of the current to a target value by varying a resonant frequency of a resonant circuit including the power transmitting coil or a resonant circuit including the power receiving coil. - View Dependent Claims (8, 9, 10, 11)
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12. A power receiving device in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, the power receiving device comprising:
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a phase reception unit configured to receive information representing a phase of a voltage supplied to the power transmitting coil; a power receiving phase detection unit configured to detect a phase of a current that flows in the power receiving coil; and a power receiving resonant frequency control unit configured to conform a phase difference between the phase of the voltage represented by the received information and the detected phase of the current to a target value by varying a resonant frequency of a resonant circuit including the power transmitting coil or a resonant circuit including the power receiving coil. - View Dependent Claims (13, 14, 15, 16)
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Specification