Power transmission device, power transmission method, power reception device, power reception method, and power transmission system
First Claim
Patent Images
1. A power transmission device comprising:
- a transmission unit, including at least a transmission-side oscillation section and a transmission-side resonant section, to transmit power to a power reception device comprising a reception-side resonant section by using a magnetic resonance-type power transmission technique in which a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section; and
a control unit for controlling a reception power of the power reception device by changing an oscillation frequency of the transmission-side oscillation section so that a resonant frequency of a transmission-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section, the control unit defining a value to which the oscillation frequency is to be changed by applying a multiplier to a predefined reference frequency, the multiplier being defined in a change command received from the power reception device.
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Abstract
A power transmission device includes: a transmission means including at least an oscillation means and a resonant means and for transmitting power to a power reception device by using a magnetic resonance-type power transmission technique; and a control means for controlling the reception power of the power reception device so as to be at a maximum by changing at least one of an oscillation frequency of the oscillation means and a resonant frequency of the resonant means.
26 Citations
6 Claims
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1. A power transmission device comprising:
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a transmission unit, including at least a transmission-side oscillation section and a transmission-side resonant section, to transmit power to a power reception device comprising a reception-side resonant section by using a magnetic resonance-type power transmission technique in which a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section; and a control unit for controlling a reception power of the power reception device by changing an oscillation frequency of the transmission-side oscillation section so that a resonant frequency of a transmission-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section, the control unit defining a value to which the oscillation frequency is to be changed by applying a multiplier to a predefined reference frequency, the multiplier being defined in a change command received from the power reception device.
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2. A power transmission method comprising the step of:
controlling reception power of a power reception device, comprising a reception-side resonant section, by changing an oscillation frequency of a transmission-side oscillation section so that a resonant frequency of a transmission-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section by using a power transmission device, including at least the transmission-side oscillation section and the transmission-side resonant section, that transmits power to the power reception device by using a magnetic resonance-type power transmission technique in which a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section, the controlling comprising defining a value to which the oscillation frequency is to be changed by applying a multiplier to a predefined reference frequency, the multiplier being defined in a change command received from the power reception device.
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3. A power reception device comprising:
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a power reception unit to receive power by using at least a reception-side resonant section in a case where the power is transmitted from a power transmission device, including at least a transmission-side oscillation section and a transmission-side resonant section, that transmits the power by using a magnetic resonance-type power transmission technique in which a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section; and a control unit to control reception power of the power reception device by changing an oscillation frequency of the transmission-side oscillation section so that at least one of a transmission-side resonant frequency of the transmission-side resonant section and a reception-side resonant frequency of the reception-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section, the control unit defining a value to which the oscillation frequency of the transmission-side oscillation section is to be changed by applying a multiplier to a predefined reference frequency. - View Dependent Claims (4)
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5. A power reception method comprising the step of:
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using a power reception device, controlling reception power of a power reception device by changing an oscillation frequency of a transmission-side oscillation section so that at least one of a transmission-side resonant frequency of a transmission-side resonant section and a reception-side resonant frequency of a reception-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section, the controlling comprising defining a value to which the oscillation frequency of the transmission-side oscillation section is to be changed by applying a multiplier to a predefined reference frequency, wherein; the power reception device receives power by using at least the reception-side resonant section in a case where the power is transmitted from a power transmission device, including at least the transmission-side oscillation section and the transmission-side resonant section, that transmits the power by using a magnetic resonance-type power transmission technique in which a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section.
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6. A power transmission system comprising:
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a power transmission device, including at least a transmission-side oscillation section and a transmission-side resonant section, to transmit power by using a magnetic resonance-type power transmission technique; and a power reception device to receive the power transmitted from the power transmission device at least by using a reception-side resonant section; wherein; in the magnetic resonance-type power transmission technique, a frequency resonance is maintained between the transmission-side resonant section and the reception-side resonant section; and reception power of the power reception device is controlled by changing an oscillation frequency of the transmission-side oscillation section so that at least one of a transmission-side resonant frequency of the transmission-side resonant section and a reception-side resonant frequency of the reception-side resonant section is substantially equal to the oscillation frequency of the transmission-side oscillation section, the controlling comprising defining a value to which the oscillation frequency of the transmission-side oscillation section is to be changed by applying a multiplier to a predefined reference frequency, the multiplier being defined in a change command received by the power transmission device from the power reception device.
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Specification