Apparatus and method for transmitting wireless power

• US 10,554,053 B2
• Filed: 08/09/2019
• Issued: 02/04/2020
• Est. Priority Date: 12/15/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Kyung-Woo, Byun, Kang-Ho, Park, Se-Ho
• Primary Examiner(s): Whitmore, Stacy
• Application Number:
  US16/537,003
• Publication Number:
  US 20190363545A1
• Time in Patent Office: 179 Days
• Field of Search: 320108, 455522
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0245 according to signal strength

Abstract

A method and apparatus are provided for determining, by a wireless power transmitter, whether a wireless power receiver is removed from a wireless power network managed by the wireless power transmitter. The method includes transmitting a command signal to report power information of the wireless power receiver at stated periods; determining whether a report signal corresponding to the command signal is received from the wireless power receiver; and determining that the wireless power receiver is removed from the wireless power network, if the report signal is not received after transmitting the command signal a predetermined number of times at the stated periods.

Claims

1. A method for wirelessly transmitting power by a wireless power transmitter, the method comprising:

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

detecting a change in impedance of the wireless power transmitter caused by a placement of a wireless power receiver;

in response to detecting the change, outputting, through the resonator of the wireless power transmitter, driving power for communicating with the wireless power receiver;

receiving a search signal from the wireless power receiver, wherein the search signal is, based on the driving power, generated by the wireless power receiver;

based on the search signal from the wireless power receiver, transmitting, to the wireless power receiver, a first response signal corresponding to the search signal to establish a communication connection with the wireless power receiver;

receiving, from the wireless power receiver over the communication connection established based on the first response signal, a join signal including both a maximum voltage value for the wireless power receiver and a minimum voltage value for the wireless power receiver;

based on the join signal, transmitting, over the communication connection to the wireless power receiver, a second response signal including permission information; and

outputting, through the resonator, charging power to charge the wireless power receiver.

2. The method of claim 1, wherein the search signal includes at least one of a protocol version, a sequence number, company information, product information, impedance information, and capacity information.

3. The method of claim 1, wherein the first response signal includes at least one of a sequence number and network IDentifier (ID) information of the wireless power transmitter.

4. The method of claim 1, wherein the wireless power receiver is registered in a wireless power network corresponding to the wireless power transmitter based on the reception of the join signal and the transmission of the second response signal.

5. The method of claim 1, wherein the join signal further includes at least one of a sequence number, a network IDentifier (ID) of the wireless power transmitter, product information, a rated voltage value at a rear end of the DC/DC converter of the wireless power receiver, or a rated current value at the rear end of the DC/DC converter of the wireless power receiver.

6. The method of claim 1, wherein the second response signal further includes at least one of a sequence number, a network ID of the wireless power transmitter, or a session ID of the wireless power receiver.

7. The method of claim 1, wherein the permission information is written as 0 or 1 in a permission field of the second response signal, and

wherein the permission field indicates that the wireless power receiver is not permitted to join a wireless power network corresponding to the wireless power transmitter, when a value of the permission field is 0, and indicates that the wireless power receiver is permitted to join the wireless power network, when the value of the permission field is 1.

8. The method of claim 1, further comprising transmitting a command signal indicating a charge start command to the wireless power receiver.

9. The method of claim 8, wherein the command signal includes at least one of a session IDentifier (ID) of the wireless power receiver, a sequence number, a network ID of the wireless power transmitter, a command type, and command type-related information.

10. The method of claim 9, wherein the charge start command is written in a field for the command type.

11. The method of claim 8, wherein the command signal turns on a switching unit connected to a charging unit of the wireless power receiver.

12. A wireless power transmitter comprising:

a resonator;

a communication unit; and

a controller configured to;

output detection power through the resonator,

detect a change in impedance of the wireless power transmitter caused by a placement of a wireless power receiver,

in response to detecting the change, output, through the resonator, driving power for communicating with the wireless power receiver,

receive a search signal from the wireless power receiver, wherein the search signal is, based on the driving power, generated by the wireless power receiver by using the communication unit,

based on the search signal from the wireless power receiver, transmit, to the wireless power receiver, a first response signal corresponding to the search signal to establish a communication connection with the wireless power receiver by using the communication unit,

receive, from the wireless power receiver over the communication connection established based on the first response signal, a join signal including both a maximum voltage value for the wireless power receiver and a minimum voltage value for the wireless power receiver by using the communication unit,

based on the join signal, transmit, over the communication connection to the wireless power receiver, a second response signal including permission information by using the communication unit, and

output, through the resonator, charging power to charge the wireless power receiver.

13. The wireless power transmitter of claim 12, wherein the search signal includes at least one of a protocol version, a sequence number, company information, product information, impedance information, and capacity information.

14. The wireless power transmitter of claim 12, wherein the first response signal includes at least one of a sequence number and network IDentifier (ID) information of the wireless power transmitter.

15. The wireless power transmitter of claim 12, wherein the wireless power receiver is registered in a wireless power network corresponding to the wireless power transmitter based on the reception of the join signal and the transmission of the second response signal.

16. The wireless power transmitter of claim 12, wherein the join signal further includes at least one of a sequence number, a network IDentifier (ID) of the wireless power transmitter, product information, a rated voltage value at a rear end of the DC/DC converter of the wireless power receiver, or a rated current value at the rear end of the DC/DC converter of the wireless power receiver.

17. The wireless power transmitter of claim 12, wherein the second response signal further includes at least one of a sequence number, a network ID of the wireless power transmitter, or a session ID of the wireless power receiver.

18. The wireless power transmitter of claim 12, wherein the permission information is written as 0 or 1 in a permission field of the second response signal, and

wherein the permission field indicates that the wireless power receiver is not permitted to join a wireless power network corresponding to the wireless power transmitter, when a value of the permission field is 0, and indicates that the wireless power receiver is permitted to join the wireless power network, when the value of the permission field is 1.

19. The wireless power transmitter of claim 12, wherein the controller transmits a command signal indicating a charge start command to the wireless power receiver by using the communication unit.

20. The wireless power transmitter of claim 19, wherein the command signal includes at least one of a session IDentifier (ID) of the wireless power receiver, a sequence number, a network ID of the wireless power transmitter, a command type, and command type-related information.

21. The method of claim 20, wherein the charge start command is written in a field for the command type.

22. The method of claim 19, wherein the command signal turns on a switching unit connected to a charging unit of the wireless power receiver.