Method for transmitting signal by wireless power transmitter in wireless charging system, wireless power transmitter and wireless power receiver

• US 10,630,112 B2
• Filed: 08/24/2018
• Issued: 04/21/2020
• 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
• Primary Examiner(s): Gannon, Levi
• Application Number:
  US16/111,904
• Publication Number:
  US 20180366989A1
• Time in Patent Office: 606 Days
• Field of Search: 307104
• 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 receiving, from a wireless power transmitter, a first beacon power for a first duration time in every first period; receiving, from the wireless power transmitter, a second beacon power for a second duration time in every second period; if the wireless power receiver determines that an extension of the second beacon power is required, generating load changes while receiving the second beacon power for the second duration time; in response to the generated load changes, continually receiving, from the wireless power transmitter, the second beacon power until a predetermined third duration time, wherein the predetermined third duration time is determined before the second beacon power is transmitted by the wireless power transmitter; and transmitting an advertisement signal to the wireless power transmitter while receiving the second beacon power for the predetermined third duration time.

Claims

1. A control method of a wireless power receiver, the method comprising:

receiving, from a wireless power transmitter, a first beacon power for a first duration time in every first period;

receiving, from the wireless power transmitter, a second beacon power for a second duration time in every second period;

if the wireless power receiver determines that an extension of the second beacon power is required, generating load changes while receiving the second beacon power for the second duration time;

in response to the generated load changes, continually receiving, from the wireless power transmitter, the second beacon power for a third duration time, wherein the third duration time is determined before the second beacon power is transmitted by the wireless power transmitter; and

transmitting an advertisement signal to the wireless power transmitter while receiving the second beacon power for the third duration time.

2. The method of claim 1, wherein the third duration time is less than or equal to 7 seconds.

3. The method of claim 1, wherein the third duration time is greater than the second duration time.

4. The method of claim 1, wherein the load changes are generated by a dummy load.

5. The method of claim 1, wherein the load changes are generated by an equivalent circuit.

6. The method of claim 1, wherein generating load changes comprises generating load changes to a predetermined number of times or more while receiving the second beacon power for the second duration time.

7. The method of claim 1, further comprising:

encoding a predetermined value corresponding to an extension request signal for transmission of the second beacon power;

generating an in-band signal based on the encoded predetermined value; and

transmitting the generated in-band signal to the wireless power transmitter.

8. A wireless power receiver, comprising:

a communication unit;

a power receiving unit configured to receive a first beacon power for a first duration time in every first period and receive a second beacon power for a second duration time in every second period, from a wireless power transmitter;

a load generating circuit configured to generate load changes while receiving the second beacon power for the second duration time, if the wireless power receiver determines that an extension of the second beacon power is required; and

a controller configured to;

in response to the generated load changes, control the power receiving unit to continually receive, from the wireless power transmitter, the second beacon power for a third duration time, wherein the third duration time is determined before the second beacon power is transmitted by the wireless power transmitter; and

control the communication unit to transmit an advertisement signal to the wireless power transmitter while receiving the second beacon power for the third duration time.

9. The wireless power receiver of claim 8, wherein the third duration time is less than or equal to 7 seconds.

10. The wireless power receiver of claim 8, wherein the third duration time is greater than the second duration time.

11. The wireless power receiver of claim 8, wherein the load generating circuit comprises a dummy load.

12. The wireless power receiver of claim 8, wherein the load generating circuit comprises an equivalent circuit.

13. The wireless power receiver of claim 8, wherein the load generating circuit is further configured to generate load changes to a predetermined number of times or more while receiving the second beacon power for the second duration time.

14. The wireless power receiver of claim 8, wherein the controller is further configured to:

encode a predetermined value corresponding to an extension request signal for transmission of the second beacon power;

control to generate an in-band signal based on the encoded predetermined value through a load modulating circuit; and

control to transmit the generated in-band signal to the wireless power transmitter.