Amplitude shift key modulation for multi-device wireless chargers

Patent metadata

Field	Value
Publication number	US-12334752-B2
Application number	US-202318528715-A
Country	US
Kind code	B2
Filing date	Dec 4, 2023
Priority date	Jan 6, 2020
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Systems, methods and apparatus for wireless charging are disclosed. One method includes providing a first charging current to a first transmitting coil in a wireless charging device, where the first transmitting coil is coupled to a receiving coil in a first power receiving device, providing a second charging current to a second transmitting coil in the wireless charging device, where the second transmitting coil is coupled to a receiving coil in a second power receiving device, the first charging current and the second charging current being provided at different frequencies from one another, receiving a first modulated signal from the first power receiving device, where the first modulated signal includes a carrier signal provided at a frequency corresponding to the frequency of the first charging current, and filtering the first modulated signal using a band-pass filter configured to block a second modulated signal transmitted by the second power receiving device.

First claim

What is claimed is:

1. A method for communicating with a device being charged, comprising:
providing charging currents to a plurality of transmitting coils provided in a wireless charging device;
receiving a first modulated signal from a first power receiving device that receives a first charging current through at least one of the plurality of transmitting coils while the first power receiving device is receiving the first charging current, the first modulated signal including a carrier signal provided at a frequency corresponding to the frequency of the first charging current; and
causing a band-pass filter to filter the first modulated signal by blocking a second modulated signal received from a second power receiving device that receives a second charging current through the plurality of transmitting coils, wherein the first charging current and the second charging current are provided at different frequencies from one another.

2. The method of claim 1 , further comprising:
decoding a message from an output of the band-pass filter, the message originating at the first power receiving device.

3. The method of claim 2 , wherein decoding the message includes:
providing the output of the band-pass filter to an asynchronous demodulator to decode the message.

4. The method of claim 2 , wherein decoding the message includes:
demodulating the message using a detector.

5. The method of claim 2 , wherein decoding the message includes:
providing the output of the band-pass filter to a synchronous demodulator.

6. The method of claim 1 , wherein the first modulated signal is Amplitude Shift Key (ASK) modulated.

7. The method of claim 1 , further comprising:
defining a plurality of non-overlapping time slots;
assigning one of the plurality of non-overlapping time slots to each of a plurality of charging cells at a surface of the wireless charging device;
executing an active ping during a first time slot of the plurality of non-overlapping time slots;
configuring a chargeable device identified using the active ping; and
providing a third charging current to a charging cell that is assigned the first time slot.

8. A wireless charging device, comprising:
a plurality of charging cells provided on a surface of the wireless charging device;
a band-pass filter; and
a controller configured to:
provide charging currents to a plurality of transmitting coils provided in a wireless charging device; and
receive a first modulated signal from a first power receiving device that receives a first charging current through at least one of the plurality of transmitting coils while the first power receiving device is receiving the first charging current, the first modulated signal including a carrier signal provided at a frequency corresponding to the frequency of the first charging current,

wherein the band-pass filter is configured to pass the first modulated signal and block a second modulated signal received from a second power receiving device that receives a second charging current through the plurality of transmitting coils, wherein the first charging current and the second charging current are provided at different frequencies from one another.

9. The wireless charging device of claim 8 , wherein the controller configured to:
decode a message from an output of the band-pass filter, the message originating at the first power receiving device.

10. The wireless charging device of claim 9 , wherein the controller configured to:
provide the output of the band-pass filter to an asynchronous demodulator to decode the message.

11. The wireless charging device of claim 9 , wherein the controller configured to:
demodulate the message using a detector.

12. The wireless charging device of claim 9 , wherein the controller configured to:
provide the output of the band-pass filter to a synchronous demodulator.

13. The wireless charging device of claim 8 , wherein the first modulated signal is Amplitude Shift Key (ASK) modulated.

14. The wireless charging device of claim 8 , wherein the controller configured to:
define a plurality of non-overlapping time slots;
assign one of the plurality of non-overlapping time slots to each of a plurality of charging cells at a surface of the wireless charging device;
execute an active ping during a first time slot of the plurality of non-overlapping time slots;
configure a chargeable device identified using the active ping; and
provide a charging current to a charging cell corresponding to the first time slot.

15. A non-transitory processor readable storage medium comprising code that, when executed by a processor or controller causes the processor or controller to:
provide charging currents to a plurality of transmitting coils provided in a wireless charging device;
receive a first modulated signal from a first power receiving device that receives a first charging current through at least one of the plurality of transmitting coils while the first power receiving device is receiving the first charging current, the first modulated signal including a carrier signal provided at a frequency corresponding to the frequency of the first charging current; and
cause a band-pass filter to filter the first modulated signal by blocking a second modulated signal received from a second power receiving device that receives a second charging current through the plurality of transmitting coils, wherein the first charging current and the second charging current are provided at different frequencies from one another.

16. The storage medium of claim 15 , wherein the code further causes the processor or controller to:
decoding a message from an output of the band-pass filter, the message originating at the first power receiving device.

17. The storage medium of claim 16 , wherein the code further causes the processor or controller to:
providing the output of the band-pass filter to an asynchronous demodulator to decode the message, wherein the first modulated signal is Amplitude Shift Key (ASK) modulated.

18. The storage medium of claim 16 , wherein the code further causes the processor or controller to:
demodulating the message using a detector.

19. The storage medium of claim 16 , wherein the code further causes the processor or controller to:
providing the output of the band-pass filter to a synchronous demodulator.

20. The storage medium of claim 15 , wherein the code further causes the processor or controller to:
define a plurality of non-overlapping time slots;
assign one of the plurality of non-overlapping time slots to each of a plurality of charging cells at a surface of the wireless charging device;
execute an active ping during a first time slot of the plurality of non-overlapping time slots;
configure a chargeable device identified using the active ping; and
provide a third charging current to a charging cell that is assigned the first time slot.

Assignees

• Aira Inc

Inventors

• Goodchild Eric Heindel
• Winters John

Classifications

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/80

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

• H04B5/263

  Multiple coils at either side · CPC title

• H04B5/45

  Transponders · CPC title