Method and apparatus for transmitting wireless power

• US 10,291,074 B2
• Filed: 09/07/2016
• Issued: 05/14/2019
• Est. Priority Date: 09/09/2015
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Bong-Chul, Kim, Do-Won
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pham, Duc M
• Application Number:
  US15/258,502
• Publication Number:
  US 20170070101A1
• Time in Patent Office: 979 Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A method and an apparatus for wirelessly transmitting power are provided. The method includes transmitting power of a first level determined based on a maximum load power level of a load, which is electrically connected to a wireless power receiver, to the wireless power receiver, receiving information on a used load power level according to a load change in the load from the wireless power receiver, and controlling a power level transmitted to the wireless power receiver according to the information on the received used load power level.

Claims

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

transmitting, to a wireless power receiver, power of a first level based on first information including a first load power level, wherein the first load power level is allowable to a load of the wireless power receiver;

receiving, from the wireless power receiver, second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load;

controlling a power level according to the second information; and

stopping the transmission of the power of the first level during a predetermined condition in response to the second load power level being less than the first level,

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.

2. The method of claim 1,

wherein the capacitor is included in the wireless power receiver, and

wherein power is directly supplied to the load by an electric discharge of the capacitor.

3. The method of claim 1, further comprising:

transmitting to the wireless power receiver, turn-on power of the wireless power receiver;

receiving the first information from the wireless power receiver driven by the turn-on power; and

determining the power of the first level based on the received first information.

4. The method of claim 3, wherein the power of the first level is determined within a range less than the first load power level and greater than a power level of the turn-on power.

5. The method of claim 3, wherein the power of the first level is determined within a power level range which can be changed by the wireless power transmitter on the basis of the first load power level.

6. The method of claim 5, wherein the power of the first level is determined as a minimum power level of the range.

7. The method of claim 1, wherein the predetermined condition includes a capacity of the capacitor.

8. The method of claim 1, wherein, when the predetermined condition is released, the power of the first level is transmitted.

9. The method of claim 1, further comprising:

transmitting power of a second level corresponding to the second load power level in response to the second load power level being greater than the first level.

10. A method of wirelessly receiving power by a wireless power receiver, the method comprising:

transmitting, to a wireless power transmitter, first information including a first load power level, wherein the first load power level is allowable to a load of the wireless power receiver;

receiving, from the wireless power transmitter, power of a first level determined based on the first information by the wireless power transmitter;

acquiring second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load;

transmitting the second information to the wireless power transmitter; and

receiving power of a power level controlled in accordance with the second information from the wireless power transmitter,

wherein the receiving of the power of the first level is stopped by a control of the wireless power transmitter during a predetermined condition in response to the second load power level being less than the first level, and

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.

11. The method of claim 10,

wherein the capacitor is included in the wireless power receiver, and

wherein power is directly supplied to the load by an electric discharge of the capacitor.

12. The method of claim 10, further comprising:

receiving turn-on power from the wireless power transmitter; and

transmitting, to the wireless power transmitter, the first information when the wireless power receiver is driven by the turn-on power.

13. The method of claim 10, wherein the acquiring of the second information comprises:

detecting a voltage and current applied to the load; and

acquiring the second load power level based on the detected voltage and current.

14. The method of claim 10, further comprising:

receiving wireless power from the wireless power transmitter;

rectifying the received wireless power into direct current (DC) power; and

outputting the rectified DC power to the load as power of a predetermined voltage level.

15. A wireless power transmitter, comprising:

a communication unit configured to receive first information and second information from a wireless power receiver;

a wireless power transmitting unit configured to transmit wireless power to the wireless power receiver; and

a controller configured to;

transmit, to the wireless power receiver, power of a first level based on the first information including a first load power level, wherein the first load power level is allowable to a load of the wireless power receiver,

receive, from the wireless power receiver, the second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load,

control a power level according to the second information, and

stop the transmission of the power of the first level during a predetermined condition in response to the second load power level being less than the first level,

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.

16. The wireless power transmitter of claim 15, wherein the controller is further configured to:

transmit, to the wireless power receiver, turn-on power of the wireless power receiver,

receive the first information from the wireless power receiver driven by the turn-on power, and

determine the power of the first level based on the received first information.

17. The wireless power transmitter of claim 16, wherein the controller is further configured to determine the power of the first level within a range less than the first load power level and greater than a power level of the turn-on power.

18. The wireless power transmitter of claim 16, wherein the controller is further configured to determine the power of the first level within a power level range which can be changed by the wireless power transmitter on the basis of the first load power level.

19. The wireless power transmitter of claim 18, wherein the controller is further configured to determine the power of the first level to have a minimum power level of the range.

20. The wireless power transmitter of claim 15, wherein the predetermined condition includes a capacity of the capacitor.

21. The wireless power transmitter of claim 15, wherein, when the predetermined condition is released, the controller is further configured to transmit the power of the first level.

22. The wireless power transmitter of claim 15, wherein the controller is further configured to transmit power of a second level corresponding to the second load power level in response to the second load power level being greater than the first level.

23. A wireless power receiver, comprising:

a communication unit configured to transmit first information and second information to a wireless power transmitter;

a wireless power receiving unit configured to receive wireless power from the wireless power transmitter; and

a controller configured to;

transmit, to the wireless power transmitter, the first information including a first load power level, wherein the first load power level is allowable to a load of the wireless power receiver,

receive, from the wireless power transmitter, power of a first level determined based on the first information by the wireless power transmitter,

acquire the second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load,

transmit the second information to the wireless power transmitter, and

receive power of a power level controlled in accordance with the second information from the wireless power transmitter,

wherein the reception of the power of the first level is stopped by a control of the wireless power transmitter during a predetermined condition in response to the second load power level being less than the first level, and

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.

24. The wireless power receiver of claim 23,

wherein the capacitor is included in the wireless power receiver, and

wherein power is directly supplied to the load by an electric discharge of the capacitor.

25. The wireless power receiver of claim 23, wherein the controller is further configured to:

receive turn-on power from the wireless power transmitter, and

transmit, to the wireless power transmitter, the first information when the wireless power receiver is driven by the turn-on power.

26. The wireless power receiver of claim 23, wherein the controller is further configured to:

detect a current and voltage applied to the load, and

acquire the second load power level based on the detected current and voltage.

27. The wireless power receiver of claim 23, wherein the controller is further configured to:

receive wireless power from the wireless power transmitter,

rectify the received wireless power into direct current (DC) power, and

output the rectified DC power to the load as power of a predetermined voltage level.

28. A non-transitory computer readable recording medium for storing data relating to computing operations, the computer readable recording medium configured to store at least one instruction that when executed by a processor, configures the processor to:

transmit, to a wireless power receiver, power of a first level based on first information including a first load power level, wherein the first load power level is allowable to a load of the wireless power receiver;

receive, from the wireless power receiver, second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load;

control a power level according to the second information; and

stop the transmission of the power of the first level during a predetermined condition in response to the second load power level being less than the first level,

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.

29. A non-transitory computer readable recording medium for storing data relating to computing operations, the computer readable recording medium configured to store at least one instruction that when executed by a processor, configures the processor to:

transmit, to a wireless power transmitter, first information including a first load power level, wherein the first load power level is allowable to a load of a wireless power receiver;

receive, from the wireless power transmitter, power of a first level determined based on the first information by the wireless power transmitter;

acquire second information including a second load power level according to a change in the load of the wireless power receiver, wherein the second load power level is a power level measured at the load;

transmit the second information to the wireless power transmitter; and

receive power of a power level controlled in accordance with the second information from the wireless power transmitter,

wherein the reception of the power of the first level is stopped by a control of the wireless power transmitter during a predetermined condition in response to the second load power level being less than the first level, and

wherein the predetermined condition includes a condition under which the load operates by an electric discharge of a capacitor included in the wireless power receiver.