Wireless power transmission system, and method of controlling transmission and reception of resonance power

A method, executed by a power transmitter, of controlling wireless power transmission, the method comprising:

• transmitting, to a power receiver, a first wireless power in each time interval among a plurality of time intervals, wherein a resonance frequency corresponding to the first wireless power in each time interval is different from resonance frequencies in all other time intervals among the plurality of time intervals;
• receiving, from the power receiver, information about an amount of the first wireless power received by the power receiver in each time interval;
• and
• transmitting, to the power receiver, a second wireless power having a resonance frequency with a highest power transmission efficiency, selected based on the information about the amount of the first wireless power received in each time interval.

A power receiver comprising:

• a target resonator configured to receive a wireless power transmitted from a power transmitter;
• a communication unit configured to communicate with the power transmitter;
• and
• a controller configured to:
• control the target resonator to receive a first wireless power transmitted from the power transmitter in each time interval among a plurality of time intervals, wherein a resonance frequency corresponding to the first wireless power received in each time interval is different from resonance frequencies in all other time intervals among the plurality of time intervals,
• control the communication unit to transmit, to the power transmitter, information about an amount of the first wireless power received in each time interval,
• control the target resonator to receive a second wireless power transmitted from the power transmitter, the second wireless power having a resonance frequency having a highest power transmission efficiency, selected based on the information about the amount of the first wireless power received in each time interval, and
• control to charge the power receiver with the received second wireless power.

A power transmitter comprising:

• a source resonator configured to transmit a wireless power to a power receiver;
• a communication unit configured to communicate with the power receiver;
• and
• a controller configured to:
• control the source resonator to transmit, to the power receiver, a first wireless power in each time interval among a plurality of time intervals, wherein a resonance frequency corresponding to the first wireless power in each time interval is different from resonance frequencies in all other time intervals among the plurality of time intervals,
• control the communication unit to receive, from the power receiver, information about an amount of the first wireless power received by the power receiver in each time interval,
• control to generate a second wireless power having a resonance frequency having a highest power transmission efficiency, selected based on the received information about the amount of the first wireless power received in each time interval, and
• control the source resonator to transmit the second wireless power to the power receiver.