Determination method of magnetic resonant condition for multi-device wireless power transfer systems

Patent metadata

Field	Value
Publication number	US-11050301-B2
Application number	US-201916509419-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Nov 29, 2018
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Disclosed is a method of determining a magnetic resonant condition for a multi-device wireless power transfer system. A magnetic resonant condition determining method may determine a resonant condition based on a charge state, for example, a number of charging devices and a relative position between charging devices, for a multi-transmitter/receiver of a wireless power transfer system.

First claim

What is claimed is:

1. A method of determining a magnetic resonant condition for a wireless power transfer system capable of performing a wireless power transfer using at least two receivers, the method comprising:
determining a single initial charge state for at least one transmitter and the at least two receivers of the wireless power transfer system based on a transmitter rated power of the at least one transmitter and a receiver rated power for each of the at least two receivers; and
determining a resonant condition between each of the at least one transmitter and each receiver with varying at least one design variable in the wireless power transfer system by a preset magnitude in the single initial charge state that maximizes a power transfer efficiency of the wireless power transfer system.

2. The method of claim 1 , wherein
the at least one design variable comprises at least one parameter among an operating frequency, a compensation capacitance, and an input voltage.

3. The method of claim 1 , further comprising:
providing the determined resonant condition to the wireless power transfer system such that the determined resonant condition is applied to the wireless power transfer system.

4. The method of claim 1 , further comprising:
detecting a state change from the initial charge state to another charge state due to a change of operating conditions; and
redetermining the resonant condition with varying at least one of an operating frequency, a compensation capacitance, and an input voltage by the preset magnitude as the at least one design variable in the wireless power transfer system, in the other charge state.

5. The method of claim 4 , wherein the detecting of the state change comprises detecting a change in at least one of a number of transmitters of the wireless power transfer system, a number of receivers that are supplied with wireless power through the wireless power transfer system, a charge capacity of receivers, a relative position between a transmitter and a receiver, and an orientation angle of a receiver being charged.

6. The method of claim 5 , wherein the change is detected based on an output value of a sensor included in the wireless power transfer system.

7. The method of claim 4 , further comprising:
providing the redetermined resonant condition to the wireless power transfer system such that the redetermined resonant condition is applied to the wireless power transfer system for compensation that maximizes a power transfer efficiency with satisfying a rated power of each of the at least two receivers.

8. The method of claim 1 , wherein each of the at least two receivers is a charging device configured to be supplied with wireless power from the wireless power transfer system and from a source other than the wireless power transfer system.

9. A non-transitory computer-readable recording medium storing instructions that, when executed by a processor, cause the processor to perform the method of claim 1 .

10. A computer apparatus that performs a method of determining a magnetic resonant condition for a wireless power transfer system capable of performing a wireless power transfer using at least two receivers, the computer apparatus comprising:
at least one processor configured to execute a computer-readable instruction on the computer apparatus,
wherein the at least one processor is configured to determine a single initial charge state for at least one transmitter and the at least two receivers of the wireless power transfer system based on a transmitter rated power of the at least one transmitter and a receiver rated power for each of the at least two receivers, and to determine a resonant condition between each of the at least one transmitter and each receiver with varying at least one design variable in the wireless power transfer system by a preset magnitude in the single initial charge state that maximizes a power transfer efficiency of the wireless power transfer system.

11. The computer apparatus of claim 10 , wherein
the at least one design variable comprises at least one parameter among an operating frequency, a compensation capacitance, and an input voltage.

12. The computer apparatus of claim 10 , wherein the at least one processor is configured to provide the determined resonant condition to the wireless power transfer system such that the determined resonant condition is applied to the wireless power transfer system.

13. The computer apparatus of claim 10 , wherein the at least one processor is configured to detect a state change from the initial charge state to another charge state, and to redetermine the resonant condition with varying at least one of an operating frequency, a compensation capacitance, and an input voltage by the preset magnitude as the at least one design variable in the wireless power transfer system, in the other charge state.

14. The computer apparatus of claim 11 , wherein the computer apparatus is included in the wireless power transfer system to vary the at least one parameter by the preset magnitude.

15. The computer apparatus of claim 11 , wherein the computer apparatus is configured as an apparatus separate from the wireless power transfer system to control the wireless power transfer system to vary the at least one parameter by the preset magnitude through communication with the wireless power transfer system over a network.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Jang Ingwun
• Kim Mingi
• Lee Seung Beop

Classifications

• H02J7/825

  Detection of fully charged condition · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J50/80 Primary

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J50/40

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title