METHOD AND APPARATUS FOR TRANSMITTING WIRELESS POWER

• US 20170070101A1
• Filed: 09/07/2016
• Published: 03/09/2017
• Est. Priority Date: 09/09/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Bong-Chul, KIM, Do-Won
• Granted Patent: US 10,291,074 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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.

2. The method of claim 1,

wherein a 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 turn-on power of the wireless power receiver;

receiving information on the maximum load power level of the load from the wireless power receiver driven by the turn-on power; and

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

4. The method of claim 3, wherein the power of the first level is determined within a range less than the maximum load power level and greater than 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 maximum 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 controlling of the power level transmitted to the wireless power receiver comprises:

stopping, when the used load power level is less than the first level, the transmission of the power of the first level during a predetermined condition.

8. The method of claim 7, wherein the predetermined condition includes a condition under which the load can be normally operated by an electric discharge of a capacitor included in the wireless power receiver.

9. The method of claim 8, wherein the predetermined condition includes a capacity of the capacitor.

10. The method of claim 7, wherein, when the predetermined condition is released, the power of the first level is transmitted.

11. The method of claim 1, wherein the controlling of the power level transmitted to the wireless power receiver comprises:

transmitting, when the used load power level is greater than the first level, power of a second level corresponding to the used load power level.

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

receiving power of a first level determined based on a maximum load power level of a load, which is electrically connected to the wireless power receiver, from a wireless power transmitter;

acquiring information on a used load power level according to a load change in the load, which is electrically connected to the wireless power receiver;

transmitting the acquired information on the used load power level to the wireless power transmitter; and

receiving power of a power level controlled in accordance with the information on the used load power level from the wireless power transmitter.

13. The method of claim 12,

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

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

14. The method of claim 12, further comprising:

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

transmitting information on the maximum load power level of the load when driven by the turn-on power.

15. The method of claim 12, wherein the acquiring of the information on the used load power level comprises:

detecting a voltage and current applied to the load; and

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

16. The method of claim 12, 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.

17. A wireless power transmitter, comprising:

a communication unit configured to receive information on a maximum load power level of a load electrically connected to a wireless power receiver, and information on a used load power level according to a load change in the load;

a controller configured to;

transmit power of a first level determined based on the maximum load power level to the wireless power receiver,

receive information on the used load power level according to a load change in the load from the wireless power receiver, and

control a power level transmitted to the wireless power receiver according to the received information on the used load power level; and

a wireless power transmitting unit configured to transmit wireless power to the wireless power receiver according to a control of the controller.

18. The wireless power transmitter of claim 17, wherein the controller is further configured to:

transmit turn-on power of the wireless power receiver,

receive information on the maximum load power level of the load from the wireless power receiver driven by the turn-on power, and

determine the power of the first level based on the received information on the maximum 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 within a range less than the maximum load power level and greater than the turn-on power.

20. The wireless power transmitter of claim 18, 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 maximum load power level.

21. The wireless power transmitter of claim 20, wherein the controller is further configured to determine the power of the first level to have a minimum power level of the range.

22. The wireless power transmitter of claim 17, wherein, when the used load power level is less than the first level, the controller is further configured to stop the transmission of the power of the first level during a predetermined condition.

23. The wireless power transmitter of claim 22, wherein the predetermined condition includes a condition under which the load can be normally operated by an electric discharge of a capacitor included in the wireless power receiver.

24. The wireless power transmitter of claim 23, wherein the predetermined condition includes a capacity of the capacitor.

25. The wireless power transmitter of claim 22, wherein, when the predetermined condition is released, the controller is further configured to transmit the power of the first level.

26. The wireless power transmitter of claim 17, wherein, when the used load power level is greater than the first level, the controller is further configured to transmit power of a second level corresponding to the used load power level.

27. A wireless power receiver, comprising:

a communication unit configured to transmit information on a maximum load power level of a load electrically connected to the wireless power receiver, and information on a used load power level according to a load change in the load to a wireless power transmitter;

a controller configured to control a transmission of information on the maximum load power level and information on the used load power level to the wireless power transmitter; and

a wireless power receiving unit configured to receive wireless power from the wireless power transmitter.

28. The wireless power receiver of claim 27,

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

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

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

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

transmit the information on the maximum load power level of the load when driven by the turn-on power.

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

detect a current and voltage applied to the load, and

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

31. The wireless power receiver of claim 27, 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.

32. 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 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;

receive information on a used load power level according to a load change in the load from the wireless power receiver; and

control a power level transmitted to the wireless power receiver according to the information on the received used load power level.

33. 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:

receive power of a first level determined based on a maximum load power level of a load, from a wireless power transmitter;

acquire information on a used load power level according to a load change in the load;

transmit the acquired information on the used load power level to the wireless power transmitter; and

receive power of a power level controlled in accordance with the information on the used load power level from the wireless power transmitter.