Load impedance decision device, wireless power transmission device, and wireless power transmission method
First Claim
1. A load impedance decision device comprising:
- a measurement unit to measure at least one of a distance and an angle between a source resonator and a target resonator; and
a decision unit to determine a load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle.
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Abstract
A load impedance decision device, a wireless power transmission device, and a wireless power transmission method are provided. At least one of a distance and an angle between two resonators may be measured. A load impedance may be determined based on at least one of the measured distance and the measured angle. When the distance between the two resonators changes, a high power transfer efficiency may be maintained without using a separate matching circuit. Where the load impedance is determined, a test power may be transmitted. Depending on a power transfer efficiency of the test power, the load impedance may be controlled and power may be wirelessly transmitted from the source resonator to the target resonator.
11 Citations
22 Claims
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1. A load impedance decision device comprising:
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a measurement unit to measure at least one of a distance and an angle between a source resonator and a target resonator; and a decision unit to determine a load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle. - View Dependent Claims (2, 3)
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4. A wireless power transmission device comprising:
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a load impedance decision unit; and a change unit to change an impedance of the wireless power transmission device to be conjugated with a load impedance determined by the load impedance decision unit, wherein the load impedance decision unit comprises a measurement unit to measure at least one of a distance and an angle between the wireless power transmission device and a target resonator, and a decision unit to determine the load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. A terminal comprising:
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a load impedance decision unit; and a change unit to change an impedance of the terminal to match a load impedance determined by the load impedance decision unit, wherein the load impedance decision unit comprises a measurement unit to measure at least one of a distance and an angle between the terminal and a source resonator, and a decision unit to determine the load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method to determine a load impedance, the method comprising:
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measuring at least one of a distance and an angle between a source resonator and a target resonator; and determining a load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle. - View Dependent Claims (20, 21)
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22. A method for use in wireless power transmission, the method comprising:
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determining a load impedance to be used to wirelessly transmit a charging power; and changing an impedance to be conjugated with the determined load impedance, wherein the determining comprises measuring at least one of a distance and an angle between the source resonator and the target resonator, and determining the load impedance to be used to wirelessly transmit a charging power, based on at least one of the measured distance and the measured angle.
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Specification