Method and device for stabilizing communication performance during wireless power transmission

1. An electronic device comprising:

a coil;

a power provision circuit for providing power to an external device; and

at least one control circuit electrically connected to the coil and the power provision circuit;

wherein the at least one control circuit is configured to:

authenticate the external device for a transmission of power to the external device;

transmit, based on the authentication of the external device, power to the external device via the coil by using a first frequency belonging to a first frequency band and a first voltage applied to the coil or the power provision circuit;

determine whether a packet related with wireless charging from the external device via the coil is received within a first reference time, the first reference time comprising a periodic reference time;

in response to having failed to receive the packet within the first reference time, change at least one of an amplitude of the first voltage or the first frequency used for transmitting the power; and

transmit power to the external device via the coil based on at least one of the changed amplitude of the first voltage or the changed first frequency, and

wherein when an amount of change of the amplitude of the first voltage is greater than a first reference value, the amount of the change of the amplitude of the first voltage is adjusted to be less than the first reference value.

2. The electronic device of claim 1 , wherein the control circuit is configured to:

in response to having failed to receive the packet within the first reference time, change the amplitude of the power transmitted and the first frequency used for transmitting the power.

3. The electronic device of claim 1 , wherein the control circuit is configured to:

in response to having failed to receive the packet within the first reference time, change the first frequency into a second frequency different from the first frequency among the first frequency band.

4. The electronic device of claim 1 , wherein the control circuit is configured to:

after changing the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power, and in response to receiving the packet within the first reference time, reset the changed amplitude of the power transmitted or the changed first frequency.

5. The electronic device of claim 1 , wherein the control circuit is configured to:

change impedance of the electronic device based on at least one of the changed amplitude of the power transmitted or the changed first frequency; and

transmit power to the external device via the coil based on the changed impedance.

6. The electronic device of claim 1 , wherein the control circuit is configured to:

judge whether a number of times of continuously failing to receive the packet during a unit time is equal to or is greater than a preset number of times; and

in response to the number of times of continuously failing to receive the packet being equal to or being greater than the preset number of times, change the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power.

7. The electronic device of claim 1 , wherein the control circuit is configured to:

change an amplitude of a voltage wherein a value of a control error packet (CEP) received from the external device becomes 0; and

transmit power to the external device via the coil by using the first frequency belonging to the first frequency band, based on the changed amplitude of the voltage.

8. The electronic device of claim 1 , wherein the control circuit is configured to:

in response to having failed to receive the packet within the first reference time, change an amplitude of a voltage applied to the coil or the power provision circuit, based on a symbol of a lastly recognized control error packet (CEP) among the CEP received from the external device.

9. The electronic device of claim 1 , wherein the control circuit is configured to:

in response to having failed to receive the packet within the first reference time, add a first offset to the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power.

10. The electronic device of claim 9 , wherein the control circuit is configured to:

judge that the packet has not been received within the first reference time, based on at least one of the amplitude of the power having the first offset added or the first frequency having the first offset added; and

in response to having failed to receive the packet within the first reference time, change the first offset into a second offset different from the first offset.

11. An operating method of an electronic device, the method comprising:

authenticating an external device for a transmission of power to the external device;

transmitting, based on the authentication of the external device, power to the external device via a coil by using a first frequency belonging to a first frequency band and a first voltage applied to the coil or a power provision circuit;

receiving a packet related with wireless charging from the external device via the coil;

in response to having failed to receive the packet within a first reference time, changing at least one of an amplitude of the first voltage or the first frequency used for transmitting the power; and

transmitting power to the external device via the coil based on at least one of the changed amplitude of the first voltage or the changed first frequency,

wherein when an amount of change of the amplitude of the first voltage is greater than a first reference value, the amount of change of the amplitude of the first voltage is adjusted to be less than the first reference value.

12. The method of claim 11 , comprising in response to having failed to receive the packet within the first reference time, changing the amplitude of the power transmitted and the first frequency used for transmitting the power.

13. The method of claim 11 , comprising in response to having failed to receive the packet within the first reference time, changing the first frequency into a second frequency different from the first frequency among the first frequency band.

14. The method of claim 11 , comprising after changing the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power, and in response to receiving the packet within a second instance of the first reference time, resetting the changed amplitude of the power transmitted or the changed first frequency.

15. The method of claim 11 , comprising:

changing impedance of the electronic device based on at least one of the changed amplitude of the power transmitted or the changed first frequency; and

transmitting power to the external device via the coil based on the changed impedance.

16. The method of claim 11 , comprising:

judging whether a number of times of continuously failing to receive the packet during a unit time is equal to or is greater than a preset number of times; and

in response to the number of times of continuously failing to receive the packet being equal to or being greater than the preset number of times, changing the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power.

17. The method of claim 11 , comprising:

changing an amplitude of a voltage wherein a value of a control error packet (CEP) received from the external device becomes 0; and

transmitting power to the external device via the coil by using the first frequency belonging to the first frequency band, based on the changed amplitude of the voltage.

18. The method of claim 11 , comprising in response to having failed to receive the packet within the first reference time, changing an amplitude of a voltage applied to the coil or the power provision circuit, based on a symbol of a lastly recognized control error packet (CEP) among the CEP received from the external device.

19. The method of claim 11 , comprising in response to having failed to receive the packet within the first reference time, adding a first offset to the at least one of the amplitude of the power transmitted or the first frequency used for transmitting the power.

20. The method of claim 19 , comprising:

judging whether a time interval of receiving the packet is equal to or is greater than a preset value, based on at least one of the amplitude of the power having the first offset added or the first frequency having the first offset added; and

in response to the time interval of receiving the packet being equal to or being greater than the preset value, changing the first offset into a second offset different from the first offset.