Method and apparatus for providing wireless charging power to a wireless power receiver

A wireless power transmitter comprising:

• a communication circuit;
• a resonator;
• and
• a controller configured to:
• control to periodically output a first power with a first cycle through the resonator,
• control to periodically output a second power with a second cycle after the first power through the resonator for a communication between the wireless power transmitter and a wireless power receiver, wherein the second cycle is longer than the first cycle,
• detect a load change while outputting the first power, wherein the load change is caused by placement of the wireless power receiver within a charging area of the wireless power transmitter,
• in response to detecting the load change while outputting the first power, control to output the second power through the resonator for the communication between the wireless power transmitter and the wireless power receiver, and
• receive, through the communication circuit, a signal,
• wherein the signal is transmitted from the wireless power receiver based on the second power.

A control method of a wireless power transmitter, the method comprising:

• periodically outputting a first power with a first cycle through a resonator of the wireless power transmitter;
• periodically outputting a second power with a second cycle after the first power through the resonator of the wireless power transmitter for a communication between the wireless power transmitter and a wireless power receiver, wherein the second cycle is longer than the first cycle;
• detecting a load change while outputting the first power, wherein the load change is caused by placement of the wireless power receiver within a charging area of the wireless power transmitter;
• in response to detecting the load change while outputting the first power, outputting the second power through the resonator of the wireless power transmitter for the communication between the wireless power transmitter and the wireless power receiver and receiving a signal through a communication circuit of the wireless power transmitter, wherein the signal is transmitted from the wireless power receiver based on the second power;
• and
• in response to the wireless power receiver being placed within the charging area of the wireless power transmitter and detecting the load change while outputting the second power, maintaining the outputting of the second power, wherein the signal is transmitted from the wireless power receiver based on the second power.

A wireless power transmitter comprising:

• a communication circuit;
• a resonator;
• and
• a controller configured to:
• control to periodically output a first power with a first cycle through the resonator,
• control to periodically output a second power with a second cycle after the first power through the resonator for a communication between the wireless power transmitter and a wireless power receiver, wherein the second cycle is longer than the first cycle,
• detect a load change while outputting the first power, wherein the load change is caused by placement of the wireless power receiver within a charging area of the wireless power transmitter,
• in response to detecting the load change while outputting the first power, control to output the second power through the resonator for the communication between the wireless power transmitter and the wireless power receiver, and receive a signal, through the communication circuit, a signal, wherein the signal is transmitted from the wireless power receiver based on the second power, and
• in response to the wireless power receiver being placed within the charging area of the wireless power transmitter and detecting the load change while outputting the second power, control to maintain the outputting of the second power, wherein the signal is transmitted from the wireless power receiver based on the second power.

A control method of a wireless power transmitter, the method comprising:

• outputting a first power during a first duration through a resonator of the wireless power transmitter;
• after a predetermined duration after outputting the first power, outputting a second power during a second duration through the resonator of the wireless power transmitter for a communication between the wireless power transmitter and a wireless power receiver, wherein the first duration is shorter than the second duration;
• detecting a load change while outputting the first power, wherein the load change is caused by placement of the wireless power receiver within a charging area of the wireless power transmitter;
• in response to detecting the load change while outputting the first power, outputting the second power through the resonator of the wireless power transmitter for the communication between the wireless power transmitter and the wireless power receiver, and receiving, through a communication circuit of the wireless power transmitter, a signal, wherein the signal is transmitted from the wireless power receiver based on the second power;
• and
• in response to the wireless power receiver being placed within the charging area and detecting the load change while outputting the second power, maintaining the outputting of the second power, wherein the signal is transmitted from the wireless power receiver based on the second power.

A wireless power transmitter comprising:

• a communication circuit;
• a resonator;
• and
• a controller configured to:
• control to output a first power during a first duration through the resonator;
• after a predetermined duration after transmitting the first power, control to output a second power during a second duration through the resonator for a communication between the wireless power transmitter and a wireless power receiver, wherein the first duration is shorter than the second duration,
• detect a load change while outputting the first power, wherein the load change is caused by placement of the wireless power receiver within a charging area of the wireless power transmitter,
• in response to detecting the load change while outputting the first power, control to output the second power through the resonator of the wireless power transmitter for the communication between the wireless power transmitter and the wireless power receiver, and receive, through the communication circuit of the wireless power transmitter, a signal, wherein the signal is transmitted from the wireless power receiver based on the second power, and
• in response to detecting the wireless power receiver being placed within the charging area and detecting the load change while outputting the second power, control to maintain the outputting of the second power, wherein the signal is transmitted from the wireless power receiver based on the second power.