Load impedance decision device, wireless power transmission device, and wireless power transmission method

A wireless power transmission device comprising:

• a load impedance decision unit;
• and
• a change unit configured 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 configured to measure at least one of a distance and an angle between a source resonator of the wireless power transmission device and a target resonator, and a decision unit configured to determine the load impedance based on at least one of the measured distance and the measured angle, and
• the source resonator is configured to transmit resonant power to the target resonator based on the load impedance that is determined based on at least one of the measured distance and the measured angle.

A terminal to wirelessly transmit power, the terminal comprising:

• a load impedance decision unit;
• and
• a change unit configured 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 configured to measure at least one of a distance and an angle between a source resonator of the terminal and a target resonator, and a decision unit configured to determine the load impedance based on at least one of the measured distance and the measured angle, and
• the source resonator is configured to transmit resonant power to the target resonator based on the load impedance that is determined based on at least one of the measured distance and the measured angle.

A method to determine a load impedance, the method comprising:

• measuring at least one of a distance and an angle between a source resonator and a target resonator;
• and
• determining the load impedance based on at least one of the measured distance and the measured angle,
• wherein the source resonator is configured to transmit resonant power to the target resonator based on the load impedance that is determined based on at least one of the measured distance and the measured angle.

A method to wirelessly transmit power, the method comprising:

• determining a load impedance;
• 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 a source resonator and a target resonator, and determining the load impedance based on at least one of the measured distance and the measured angle, and
• the source resonator is configured to transmit resonant power to the target resonator based on the load impedance that is determined based on at least one of the measured distance and the measured angle.

A wireless power reception device, comprising:

• a target resonator configured to wirelessly receive resonant power transmitted from a source resonator of a wireless power transmission device;
• and
• a load that is charged by the resonant power that is wirelessly received,
• wherein the resonant power transmitted from the source resonator is based on a load impedance that is determined based on at least one of a measured distance and a measured angle between the source resonator and the target resonator.