WIRELESS POWER TRANSMITTER, WIRELESS POWER RECEIVER, AND CONTROL METHODS THEREOF

• US 20140197785A1
• Filed: 01/15/2014
• Published: 07/17/2014
• Est. Priority Date: 01/15/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, BYUN, Kang-Ho, PARK, Seho
• Granted Patent: US 10,790,701 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power transmitter and method are provided for transmitting charging power to a wireless power receiver. The method includes transmitting, to the wireless power receiver, a control signal including first time information and load change information; detecting a load change of the wireless power receiver during a period of time corresponding to the first time information; and determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal.

Claims

1. A method for controlling a wireless power transmitter to transmit charging power to a wireless power receiver, the method comprising:

transmitting, to the wireless power receiver, a control signal including first time information and load change information;

detecting a load change of the wireless power receiver during a period of time corresponding to the first time information; and

determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal.

2. The method of claim 1, further comprising determining that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver does not correspond to the load change information included in the control signal.

3. The method of claim 1, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information.

4. The method of claim 1, wherein the control signal further includes second time information, the method further comprising:

after a lapse of the period of time corresponding to the first time information, detecting a load change of the wireless power receiver during a period of time corresponding to the second time information; and

determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information corresponds to load change information included in the control signal.

5. The method of claim 4, further comprising determining that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information does not correspond to the load change information included in the control signal.

6. The method of claim 4, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information.

7. A wireless power transmitter for transmitting charging power to a wireless power receiver, the wireless power transmitter comprising:

a communication unit configured to transmit a control signal including first time information and load change information to the wireless power receiver;

a controller configured to detect a load change of the wireless power receiver during a period of time corresponding to the first time information, and to determine that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal; and

a power transmitting unit configured to apply the charging power to the wireless power receiver authorized for charging.

8. The wireless power transmitter of claim 7, wherein the controller is configured to determine that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver does not correspond to the load change information included in the control signal.

9. The wireless power transmitter of claim 7, wherein the load change information comprises information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information.

10. The wireless power transmitter of claim 7, wherein the control signal further comprises second time information, and

wherein the controller is configured to detect a load change of the wireless power receiver during a period of time corresponding to the second time information, after a lapse of the period of time corresponding to the first time information, and to determine that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information corresponds to the load change information included in the control signal.

11. The wireless power transmitter of claim 10, wherein the controller is configured to determine that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information does not correspond to the load change information included in the control signal.

12. The wireless power transmitter of claim 10, wherein the load change information comprises information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information.

13. A method for controlling a wireless power receiver to receive charging power from a wireless power transmitter, the method comprising:

receiving, from the wireless power transmitter, a control signal including first time information and load change information;

changing a load state according to the load change information, during a period of time corresponding to the first time information; and

returning the load state back to a previous state before the changing, after a lapse of the period of time corresponding to the first time information.

14. The method of claim 13, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information.

15. The method of claim 13, wherein the control signal further includes second time information, the further comprising:

after the lapse of the period of time corresponding to the first time information, changing the load state according to the load change information during a period of time corresponding to the second time information; and

returning the load state back to a state before the changing, after a lapse of the period of time corresponding to the second time information.

16. The method of claim 15, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information.

17. A wireless power receiver for receiving charging power from a wireless power receiver, the wireless power receiver comprising:

a communication unit configured to receive a control signal including first time information and load change information from the wireless power transmitter;

a charging unit configured to charge the wireless power receiver at the charging power received from the wireless power transmitter;

a load switch configured to switch a connection state of the charging unit to be in an on or off state; and

a controller configured to controlling the load switch to be changed into the on state during a period of time corresponding to the first time information, based on the load change information.

18. The wireless power receiver of claim 17, wherein the control signal further comprises second time information, and

wherein the controller controls the load switch to be changed into the off state during a period of time corresponding to the second time information, after a lapse of the period of time corresponding to the first time information.