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

• US 20130181665A1
• Filed: 01/16/2013
• Published: 07/18/2013
• Est. Priority Date: 01/17/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, Byun, Kang-Ho, Park, Se-Ho
• Application Number:
  US13/743,021
• Publication Number:
  US 20130181665A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/24 Inductive coupling
• 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

Disclosed is a control method of a wireless power transmitter for transmitting charging power to a wireless power receiver. The control method includes receiving a communication request signal for transmitting a wireless power from the wireless power receiver, determining whether to set a communication with the wireless power receiver based on the received communication request signal, when it is determined to set the communication with the wireless power receiver, transmitting a charge command signal to control an on state of a load switch at a predetermined point in time to the wireless power receiver, applying the charging power and detecting a load change by the wireless power receiver at the predetermined point in time.

Claims

1. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the control method comprising:

receiving a communication request signal for transmitting wireless power from the wireless power receiver;

determining whether to set a communication with the wireless power receiver based on the received communication request signal;

when it is determined to set the communication with the wireless power receiver, transmitting a charge command signal to control an on state of a load switch at a predetermined point in time to the wireless power receiver;

applying the charging power; and

detecting a load change by the wireless power receiver at the predetermined point in time.

2. The control method of claim 1, further comprising:

comparing the predetermined point in time with a load change detected point in time.

3. The control method of claim 2, further comprising:

maintaining applying the charging power if the predetermined point in time is associated with the load change detected point in time, and stopping applying the charging power if the predetermined point in time is not associated with the load change detected point in time.

4. The control method of claim 1, further comprising:

before receiving the communication request signal for transmitting the wireless power from the wireless power receiver,

applying detection power for detecting the load change;

detecting the load change due to the applied detection power; and

when the load change is detected, applying driving power for driving the wireless power receiver.

5. The control method of claim 4, further comprising, before applying the detection power for detecting the load change, transmitting a notice signal for defining a period of a wireless power network.

6. The control method of claim 1, wherein detecting the load change at the predetermined point in time comprises:

monitoring the load change at one point of the wireless power transmitter; and

detecting the load change due to switching to the on state of the load switch of the wireless power receiver.

7. The control method of claim 1, wherein applying the charging power comprises temporarily increasing a power quantity of the charging power from driving power.

8. The control method of claim 1, wherein applying the charging power comprises gradually increasing a power quantity of the charging power from driving power.

9. The control method of claim 1, further comprising, after determining whether to set the communication with the wireless power receiver, transmitting a response signal indicating whether to set the communication with the wireless power receiver.

10. The control method of claim 9, further comprising, after transmitting the response signal, receiving an Ack signal corresponding to the response signal from the wireless power receiver.

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

a communication unit for receiving a communication request signal for transmitting wireless power from the wireless power receiver;

a controller for determining whether to set a communication with the wireless power receiver based on the received communication request signal, and controlling the communication unit to transmit a charge command signal to control an on state of a load switch at a predetermined point in time to the wireless power receiver when it is determined that the wireless power receiver communicates with a wireless power network; and

a power transmitter for applying the charging power,

wherein the controller detects a load change by the wireless power receiver at the predetermined point in time.

12. The wireless power transmitter of claim 11,

wherein the controller compares the predetermined point in time with a load change detected point in time.

13. The wireless power transmitter of claim 12,

wherein the power transmitter maintains applying the charging power if the predetermined point in time is associated with the load change detected point in time, and stops applying the charging power if the predetermined point in time is not associated with the load change detected point in time.

14. The wireless power transmitter of claim 11, wherein, before receiving the communication request signal, the controller controls the power transmitter to apply detection power for detecting the load change, and controls such that driving power for driving the wireless power receiver is applied when the load change due to the applied detection power is detected.

15. The wireless power transmitter of claim 14, wherein, before the detection power for detecting the load change is applied to the power transmitter, the communication unit transmits a notice signal for defining a period of the wireless power network.

16. The wireless power transmitter of claim 11, wherein the controller monitors the load change at one point of the wireless power transmitter and detects the load change due to switching to the on state of the load switch of the wireless power receiver at the predetermined point in time.

17. The wireless power transmitter of claim 11, wherein the controller temporarily increases a power quantity applied to the power transmitter of the charging power from driving power.

18. The wireless power transmitter of claim 11, wherein the controller gradually increases a power quantity applied to the power transmitter of the charging power from driving power.

19. The wireless power transmitter of claim 11, wherein, after determining whether to set the communication with the wireless power receiver, the controller transmits a response signal indicating whether to set the communication with the wireless power receiver.

20. The wireless power transmitter of claim 19, wherein the communication unit receives an Ack signal corresponding to the response signal from the wireless power receiver.

21. A control method of a wireless power receiver for receiving charging power from a wireless power transmitter, the control method comprising:

transmitting a communication request signal for communicating with the wireless power transmitter;

receiving a charge command signal to control an on state of a load switch at a predetermined point in time from the wireless power transmitter;

receiving the charging power from the wireless power transmitter by controlling the load switch to be in the on state at the predetermined point in time.

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

a communication unit for transmitting a communication request signal for communicating with the wireless power transmitter and receiving a charge command signal to control an on state of a load switch at a predetermined point in time from the wireless power transmitter;

a charging unit for receiving the charging power from the wireless power transmitter;

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

a controller for controlling the load switch to be in the on state at the predetermined point in time.

23. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the control method comprising:

receiving a wireless power transmitter search signal for searching for the wireless power transmitter from the wireless power receiver;

determining whether a load change by the wireless power receiver is detected; and

when the load change is detected, letting the wireless receiver join a wireless power network controlled by the wireless power transmitter.