METHOD FOR TRANSMITTING SIGNAL BY WIRELESS POWER TRANSMITTER IN WIRELESS CHARGING SYSTEM, WIRELESS POWER TRANSMITTER AND WIRELESS POWER RECEIVER

• US 20150372496A1
• Filed: 06/24/2015
• Published: 12/24/2015
• Est. Priority Date: 06/24/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, SONG, Keum-Su, JUNG, Hee-Won
• Granted Patent: US 10,075,020 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A method of transmitting a signal by a wireless power transmitter in a wireless charging system, wireless power transmitter, and a wireless power receiver are provided. The method includes transmitting a first signal; transmitting a second signal; detecting a load change during a period in which the second signal is transmitted; and extending a transmission period of the second signal based on the detected load change. The wireless power transmitter includes a power transmission unit configured to transmit a first signal and a second signal; a sensing unit configured to detect a load change during a period in which the second signal is transmitted; and a controller configured to extend a transmission period of the second signal based on the detected load change.

Claims

1. A method of transmitting a signal by a wireless power transmitter in a wireless charging system, the method comprising:

transmitting a first signal;

transmitting a second signal;

detecting a load change during a period in which the second signal is transmitted; and

extending a transmission period of the second signal based on the detected load change.

2. The method of claim 1, wherein the first signal is a short-beacon signal and the second signal is a long-beacon signal.

3. The method of claim 1, wherein the first signal is transmitted in every first period, and the second signal is transmitted in every second period.

4. The method of claim 1, further comprising receiving an advertisement signal from a wireless power receiver.

5. The method of claim 1, wherein extending the transmission period of the second signal comprises extending the transmission period of the second signal, if a load change is detected a predetermined number of times or more during the period in which the second signal is transmitted.

6. The method of claim 1, wherein extending the transmission period of the second signal further comprises extending the transmission period of the second signal by the transmission period of the second signal.

7. The method of claim 1, further comprising:

decoding an in-band signal from a wireless power receiver during the period in which the second signal is transmitted; and

if the decoded signal corresponds to a predetermined value, determining the decoded signal as an extension request signal for transmission of the second signal.

8. A wireless power transmitter, comprising:

a power transmission unit configured to transmit a first signal and a second signal;

a sensing unit configured to detect a load change during a period in which the second signal is transmitted; and

a controller configured to extend a transmission period of the second signal based on the detected load change.

9. The wireless power transmitter of claim 8, wherein the first signal is a short-beacon signal and the second signal is a long-beacon signal.

10. The wireless power transmitter of claim 8, wherein the first signal is transmitted in every first period, and the second signal is transmitted in every second period.

11. The wireless power transmitter of claim 8, wherein the controller is configured to receive an advertisement signal from a wireless power receiver, and to handle registration of the wireless power receiver.

12. The wireless power transmitter of claim 8, wherein the controller is configured to extend the transmission period of the second signal, if a load change is detected a predetermined number of times or more during the period in which the second signal is transmitted.

13. The wireless power transmitter of claim 8, wherein the controller is configured to further extend the transmission period of the second signal by the transmission period of the second signal.

14. The wireless power transmitter of claim 8, further comprising:

a decoding unit configured to decode an in-band signal from a wireless power receiver during the period in which the second signal is transmitted; and

wherein if the decoded signal corresponds to a predetermined value, the controller is further configured to determine the decoded signal as an extension request signal for transmission of the second signal.

15. A wireless power receiver, comprising:

a power reception unit configured to receive a first signal and a second signal;

a control circuit that is electrically connected to the power reception unit, and configured to generate a control signal for a load change based on the first signal or the second signal received from the power reception unit; and

a switching unit that is provided between the power reception unit and a load, and configured to switch a connection between the power reception unit and the load based on the control signal from the control circuit.

16. The wireless power receiver of claim 15, wherein the first signal is a short-beacon signal and the second signal is a long-beacon signal.

17. The wireless power receiver of claim 15, wherein the first signal is transmitted in every first period, and the second signal is transmitted in every second period.

18. The wireless power receiver of claim 15, further comprising a communication unit configured to transmit an advertisement signal in response to reception of the second signal.

19. The wireless power receiver of claim 15, wherein the control circuit is configured to generate a control signal for a load change, a number of which is greater than or equal to a predetermined number of times, in response to the received first signal or second signal.

20. The wireless power receiver of claim 15, wherein the control circuit is configured to generate a predetermined code or signal for requesting extension of transmission of the second signal, in response to the received first signal or second signal.