System, apparatus and method for optimizing wireless charging via load modulation

• US 10,511,183 B2
• Filed: 12/02/2016
• Issued: 12/17/2019
• Est. Priority Date: 12/02/2016
• Status: Active Grant

• Current Assignee: Sichuan Yichong Technology Co. Ltd.
• Original Assignee: Shenzhen Yichong Wireless Power Technology Co. Ltd.
• Inventors: Pan, Siming, He, Dawei, Li, Tun
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US15/368,495
• Publication Number:
  US 20180159352A1
• Time in Patent Office: 1,110 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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

Abstract

A wireless charging system, including a power transmitter configured to generate wireless energy, and a power receiver configured to receive wireless energy at a predetermined carrier frequency that could be fixed or tuned during operation. A controller, wherein the controller is configured to activate when the power receiver receives the wireless energy. The controller may be configured to control a load modulation element to generate one or more signals containing relevant information for system operation and performance optimization, and wherein the one or more signals are transmitted via the power receiver.

Claims

1. A wireless charging system, comprising:

a power transmitter configured to generate wireless energy for electrical power;

a power receiver configured to receive wireless energy for electrical power at a predetermined carrier frequency that is configured to be one of fixed or tuned during operation; and

a controller, operatively coupled to the power receiver, wherein the controller is configured to activate when the power receiver receives the wireless energy, and wherein the controller is configured to control a load modulation element to generate one or more signals comprising information associated with system operation and performance optimization, and wherein the one or more signals are transmitted via the power receiver.

2. The wireless charging system of claim 1, wherein the power transmitter comprises:

a demodulation circuit;

a filter circuit;

a comparator circuit; and

digital signal processing circuitry.

3. The wireless charging system of claim 2, wherein the power transmitter is configured to receive and filter the one or more signals transmitted by the receiver via the filter circuit, and compare the filtered one or more signals to a reference voltage in the comparator circuit.

4. The wireless charging system of claim 1, wherein the power receiver comprises a modulator circuit.

5. The wireless charging system of claim 1, further comprising communications circuitry configured to provide secure communication between the power transmitter and power receiver, wherein the secure communication is through a winding structure of the power transmitter and the power receiver.

6. The wireless charging system of claim 5, wherein the communication circuitry is configured to provide secure communication comprising an authentication signal.

7. The wireless charging system of claim 1, wherein the wireless energy is configured to be initiated at a distance between the power receiver and the power transmitter depending on specific transmitter and receiver winding structure and/or hardware.

8. The wireless charging system of claim 7, wherein the power transmitter is configured to generate wireless energy using a portion of the power transmitter at the distance between the power receiver and the power transmitter.

9. A method for operating a wireless charging system, comprising:

configuring a power transmitter to generate wireless energy for power;

configuring a power receiver to receive wireless energy for power at a predetermined carrier frequency configured to be one of fixed or tuned during operation;

activating a controller, operatively coupled to the power receiver, when the power receiver receives the wireless energy;

controlling, via the controller, a load modulation element to generate one or more signals comprising information associated with system operation and performance optimization, and wherein the generated one or more signals are transmitted via the power receiver.

10. The method of claim 9, wherein the power transmitter comprises a demodulation circuit, a filter circuit, a comparator circuit, and digital signal processing circuitry.

11. The method of claim 10, further comprising:

receiving and filtering, via the power transmitter, the one or more signals transmitted by the receiver via the filter circuit; and

comparing, via the comparator circuit, the filtered one or more signals to a reference voltage.

12. The method of claim 9, wherein the power receiver comprises a modulator circuit.

13. The method of claim 9, further comprising providing, via communications circuitry, secure communication between the power transmitter and power receiver, wherein the secure communication is through a winding structure of the power transmitter and the power receiver.

14. The method of claim 13, wherein the providing secure communication comprises communicating an authentication signal.

15. The method of claim 9, wherein configuring the power transmitter to generate wireless energy comprises configuring the power transmitter to initiate wireless energy at a distance between the power receiver and the power transmitter depending on specific transmitter and receiver winding structure and/or hardware.

16. The method of claim 15, wherein configuring the power transmitter to generate wireless energy comprises configuring the power transmitter to generate wireless energy using a portion of the power transmitter at the distance between the power receiver and the power transmitter.

17. A power receiver configured to receive wireless energy, comprising:

an input comprising one or more charging windings for receiving wireless energy for power at a predetermined carrier frequency configured to be one of fixed or tuned during operation;

a rectification circuit, operatively coupled to the input;

a load modulation circuit, operatively coupled to the rectification circuit; and

a controller, operatively coupled to the load modulation circuit, wherein the controller is configured to activate when the input receives the wireless energy, and wherein the controller is configured to control a load modulation element to generate one or more signals comprising information associated with system operation and performance optimization, and wherein the one or more signals are transmitted via the charging windings.

18. The power receiver of claim 17, further comprising communications circuitry configured to provide secure communication between the power receiver and a power transmitter, wherein the secure communication is through a winding structure of the power receiver.

19. The power receiver of claim 18, wherein the communication circuitry is configured to provide secure communication comprising an authentication signal.

20. The wireless charging system of claim 17, wherein the input is configured to receive further wireless energy in response to the transmission of the one or more signals.