Method and apparatus for controlling wireless charging during mode transition of a wireless power receiving device
Methods and apparatuses for performing wireless charging are disclosed. One of the disclosed apparatuses is a wireless power transmitter which can receive charging power from a wireless power transmitter. When the wireless power transmitter detects a transition from a Stand Alone (SA) mode to a Non Stand Alone (NSA) mode, it generates a message that includes address information used to re-connect with the wireless power transmitter and transmits the message to the wireless power transmitter.
1. A method of a wireless power receiver, the method comprising:
receiving, through a power receiving circuit, power from a wireless power transmitter;
performing, by a communication unit, communication with the wireless power transmitter;
transmitting, by the communication unit, to the wireless power transmitter, a message indicating a mode transition of the communication unit;
terminating the communication with the wireless power transmitter;
performing the mode transition for a time period, while receiving the power from the wireless power transmitter; and
resuming the communication with the wireless power transmitter, after performing the mode transition.
2. The method of claim 1 , wherein the mode transition comprises a transition from a first mode to a second mode.
3. The method of claim 2 , wherein the communication unit of the wireless power receiver performs the communication with the wireless power transmitter using a first communication scheme stored within the communication unit in the first mode, and performs the communication with the wireless power transmitter using a second communication scheme received from an application processor of the wireless power receiver in the second mode.
4. The method of claim 1 , further comprising, upon performing the mode transition, receiving the power from the wireless power transmitter.
5. The method of claim 1 , wherein the message is transmitted in a Power Reception Unit (PRU) alert signal.
6. The method of claim 5 , wherein the mode transition is indicated in a data field of the PRU alert signal.
7. The method of claim 1 , wherein the message comprises address information used to re-connect with the wireless power transmitter.
8. The method of claim 7 , wherein resuming the communication comprises re-connecting with the wireless power transmitter using the address information.
9. A method of a wireless power transmitter, the method comprising:
transmitting power to a wireless power receiver;
performing communication with the wireless power receiver;
receiving, from the wireless power receiver, a message indicating a mode transition of a communication unit in the wireless power receiver;
terminating the communication with the wireless power receiver;
in response to the receiving the message, maintaining the power transmission to the wireless power receiver for a time period; and
after the mode transition, resuming the communication with the wireless power receiver.
10. The method of claim 9 , wherein the mode transition comprises a transition from a first mode to a second mode.
11. The method of claim 10 , wherein the communication unit of the wireless power receiver performs the communication with the wireless power transmitter using a first communication scheme stored within the communication unit in the first mode, and performs communication with the wireless power transmitter using a second communication scheme received from an application processor of the wireless power receiver in the second mode.
12. The method of claim 9 , wherein the message is transmitted in a Power Reception Unit (PRU) alert signal.
13. The method of claim 12 , wherein the mode transition is indicated in a data field of the PRU alert signal.
14. The method of claim 9 , wherein the message comprises address information used to re-connect with the wireless power receiver.
15. The method of claim 14 , wherein resuming the communication comprises re-connecting with the wireless power receiver using the address information.
16. A wireless power receiver for wireless charging, the wireless power receiver comprising:
a power receiving circuit configured to receive charging power from a wireless power transmitter;
a communication unit configured to perform communication with the wireless power transmitter; and
a processor configured to:
determine a mode transition of the communication unit,
control the communication unit to transmit, to the wireless power transmitter, a message indicating the mode transition of the communication unit,
control to perform the mode transition for a time period, and
control the communication unit to resume the communication with the wireless power transmitter, after performing the mode transition.
17. The wireless power receiver of claim 16 , wherein the mode transition comprises a transition from a first mode to a second mode.
18. The wireless power receiver of claim 17 , wherein the communication unit is further configured to:
perform the communication with the wireless power transmitter using a first communication scheme stored within the communication unit in the first mode, and
perform the communication with the wireless power transmitter using a second communication scheme received from an application processor of the wireless power receiver in the second mode.
19. The wireless power receiver of claim 16 , wherein the processor is further configured to receive the charging power from the wireless power transmitter upon performing the mode transition.
20. The wireless power receiver of claim 16 , wherein the message is transmitted in a Power Reception Unit (PRU) alert signal.
21. The wireless power receiver of claim 20 , wherein the mode transition is indicated in a data field of the PRU alert signal.
22. The wireless power receiver of claim 16 , wherein the message comprises address information used to re-connect with the wireless power transmitter.
23. The wireless power receiver of claim 22 , wherein the processor is further configured to control the communication unit to re-connect with the wireless power transmitter using the address information.
24. A wireless power transmitter for wireless charging, the wireless power transmitter comprising:
a power transmitting unit configured to transmit power to a wireless power transmitter;
a communication unit configured to perform communication with the wireless power receiver; and
a processor configured to:
when receiving, from the wireless power receiver, a message indicating a mode transition of a communication unit in the wireless power receiver, terminate the communication with the wireless power receiver,
maintain the power transmission to the wireless power receiver for a time period, and
after the mode transition, resume the communication with the wireless power receiver.
25. The wireless power transmitter of claim 24 , wherein the mode transition comprises a transition from a first mode to a second mode.
26. The wireless power transmitter of claim 25 , wherein the communication unit of the wireless power receiver performs the communication with the wireless power transmitter using a first communication scheme stored within the communication unit in the first mode, and performs the communication with the wireless power transmitter using a second communication scheme received from an application processor of the wireless power receiver in the second mode.
27. The wireless power transmitter of claim 24 , wherein the message is transmitted in a Power Reception Unit (PRU) alert signal.
28. The wireless power transmitter of claim 27 , wherein the mode transition is indicated in a data field of the PRU alert signal.
29. The wireless power transmitter of claim 24 , wherein the message comprises address information used to re-connect with the wireless power receiver.
30. The wireless power transmitter of claim 29 , wherein the processor is further configured to resume the communication by re-connecting with the wireless power receiver using the address information.