Method for transmitting wireless power in wireless charging system including a wireless power transmitting unit and wireless power receiving unit

• US 10,784,708 B2
• Filed: 11/29/2018
• Issued: 09/22/2020
• Est. Priority Date: 07/27/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Kyung-Woo, Jung, Hee-Won
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): Omar, Ahmed H
• Application Number:
  US16/204,363
• Publication Number:
  US 20190097451A1
• Time in Patent Office: 663 Days
• Field of Search: 320108
• 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 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/007192 in response to temperature
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• 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

A method for transmitting wireless power in a wireless charging system and a wireless power transmitting unit (PTU) and provided. The method for transmitting wireless power in a wireless charging system includes receiving information related to a voltage from each of a plurality of power receiving units (PRUs); identifying a voltage ratio of each of the plurality of PRUs based on the received information, wherein the voltage ratio is a current voltage relative to a first voltage; determining a PRU among the plurality of PRUs based on the identified voltage ratio; and adjusting transmission power according to a voltage setting value of the determined PRU.

Claims

1. A method of controlling a wireless power transmitter, the method comprising:

receiving first information related to a maximum voltage from each of the plurality of power receiving units (PRUs);

transmitting a first level of power for charging the plurality of PRUs;

receiving second information related to a measured voltage in each of the plurality of PRUs;

identifying a voltage ratio of each of the plurality of PRUs based on the first information and the second information, wherein the voltage ratio is a measured voltage relative to a maximum voltage of each of the plurality of PRUs;

selecting a PRU from among the plurality of PRUs based on the identified voltage ratio; and

transmitting a second level of power for charging according to a voltage setting value of the selected PRU.

2. The method of claim 1, wherein the selected PRU is regarded as a dominant PRU.

3. The method of claim 1, wherein the maximum voltage is set by each of the plurality of PRUs.

4. The method of claim 1, wherein the first information related to the maximum voltage is received through a PRU static signal or a PRU dynamic signal that is transmitted by the PRU.

5. The method of claim 1, wherein the selected PRU is a PRU has the highest voltage ratio among the plurality of the PRUs.

6. The method of claim 1, wherein the second information related to the measured voltage is received through a PRU dynamic signal that is transmitted by the PRU in a low power mode.

7. The method of claim 1, wherein the second information related to the measured voltage is received through a PRU dynamic signal that is transmitted by the PRU in a power transmission mode.

8. A wireless power transmitting unit (PTU), comprising:

communication circuitry;

a power transmitter; and

a processor configured to;

receive first information related to a maximum voltage from each of a plurality of power receiving units (PRUs) through the communication circuitry;

control the power transmitter to transmit a first level of power for charging the plurality of (PRUs);

receive second information related to a measured voltage in each of the plurality of PRUs through the communication circuitry;

identify a voltage ratio of each of the plurality of PRUs based on the first information and the second information;

select a PRU from among the plurality of PRUs based on the identified voltage ratio, wherein the voltage ratio is a measured voltage relative to a maximum voltage of each of the plurality of PRUs; and

transmit a second level of power for charging the plurality of PRUs based on a voltage setting value of the selected PRU.

9. The PTU of claim 8, wherein the selected PRU is regarded as a dominant PRU.

10. The PTU of claim 8, wherein the maximum voltage is set by each of the plurality of PRUs.

11. The PTU of claim 8, wherein the first information related to the maximum voltage is received through a PRU static signal or a PRU dynamic signal that is transmitted by the PRU.

12. The PTU of claim 8, wherein the selected PRU is a PRU has the highest voltage ratio among the plurality of the PRUs.

13. The PTU of claim 8, wherein the second information related to the measured voltage is received through a PRU dynamic signal that is transmitted by the PRU in a low power mode.

14. The PTU of claim 8, wherein the second information related to the measured voltage is received through a PRU dynamic signal that is transmitted by the PRU in a power transmission mode.