Wireless power transmitter for excluding cross-connected wireless power receiver and method for controlling the same

1. A method for controlling a wireless power transmitter, the method comprising:

outputting a detection power through a resonator of the wireless power transmitter;

receiving, from a wireless power receiver, a first signal including load detection indication bits corresponding to a type of the wireless power receiver, through a wireless communication circuit of the wireless power transmitter;

based on identifying that the load detection indication bits have a first value, transmitting, through the wireless communication circuit, a second signal responsive to the first signal to the wireless power receiver, regardless of a change in a load being detected while outputting the detection power; and

based on identifying that the load detection indication bits have a value other than the first value:

in response to the change in the load being detected while outputting the detection power, transmitting, through the wireless communication circuit, the second signal responsive to the first signal to the wireless power receiver, and

in response to the change in the load not being detected while outputting the detection power, stopping a communication with the wireless power receiver.

2. The method of claim 1 , further comprising:

determining whether the wireless power receiver is capable of generating the change in the load based on the load detection indication bits.

3. The method of claim 1 , wherein the load detection indication bits are one of 000, 001, 010, 011, 100 and 101.

4. The method of claim 3 , further comprising:

based on the load detection indication bits being 000, determining that the change in the load cannot be detected even though the wireless power receiver is placed within a charging area of the wireless power transmitter.

5. The method of claim 3 , further comprising:

based on the load detection indication bits being a value other than 000, determining that the wireless power receiver is capable of generating the change in the load of the wireless power transmitter.

6. The method of claim 3 , further comprising:

based on the load detection indication bits being 001, determining that a category of the wireless power receiver is category 1;

based on the load detection indication bits being 010, determining that the category of the wireless power receiver is category 2;

based on the load detection indication bits being 011, determining that the category of the wireless power receiver is category 3;

based on the load detection indication bits being 100, determining that the category of the wireless power receiver is category 4; or

based on the load detection indication bits being 101, determining that the category of the wireless power receiver is category 5.

7. A wireless power transmitter, comprising:

a resonator;

a wireless communication circuit; and

a controller configured to:

control the wireless power transmitter to output a detection power through the resonator,

receive, through the wireless communication circuit, a first signal including load detection indication bits corresponding to a type of a wireless power receiver, from the wireless power receiver,

based on identifying that the load detection indication bits have a first value, transmit, through the wireless communication circuit, a second signal responsive to the first signal to the wireless power receiver, regardless of a change in a load being detected while outputting the detection power, and

based on identifying that the load detection indication bits have a value other than the first value;

in response to the change in the load being detected while outputting the detection power, transmit, through the wireless communication circuit, the second signal responsive to the first signal to the wireless power receiver, and

in response to the change in the load not being detected while outputting the detection power, stop a communication with the wireless power receiver.

8. The wireless power transmitter of claim 7 , wherein the controller is further configured to:

determine whether the wireless power receiver is capable of generating the change in the load based on the load detection indication bits.

9. The wireless power transmitter of claim 7 , wherein the load detection indication bits are one of 000, 001, 010, 011, 100 and 101.

10. The wireless power transmitter of claim 9 , wherein the controller is further configured to:

based on the load detection indication bits being 000, determine that the change in the load cannot be detected even though the wireless power receiver is placed within a charging area of the wireless power transmitter.

11. The wireless power transmitter of claim 9 , wherein the controller is further configured to:

based on the load detection indication bits being a value other than 000, determine that the wireless power receiver is capable of generating the change in the load of the wireless power transmitter.

12. The wireless power transmitter of claim 9 , wherein the controller is further configured to:

determine that a category of the wireless power receiver is category 1 based on the load detection indication bits being 001,

determine that the category of the wireless power receiver is category 2 based on the load detection indication bits being 010,

determine that the category of the wireless power receiver is category 3, based on the load detection indication bits being 011,

determine that the category of the wireless power receiver is category 4 based on the load detection indication bits being 100, or

determine that the category of the wireless power receiver is category 5 based on the load detection indication bits being 101.