Wireless power transfer and communications

Patent metadata

Field	Value
Publication number	US-9962085-B2
Application number	US-201514814447-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Jul 30, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An inductive wireless power transfer and communication system includes an electrostatic shield for one of the coils. The electrostatic shield is inductively coupled with the coil and is configured as an open circuit. A signal processing element or elements, especially a modulator or a demodulator, are connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the modulator or demodulator can operate on the signal on the coil.

First claim

I claim:

1. A wireless power transfer and communication system comprising:
a first coil;
an electrostatic shield for the first coil, the electrostatic shield having a gap extending the axial length of the electrostatic shield, wherein the electrostatic shield is inductively coupled to the first coil;
a first signal processor coupled across the gap of the electrostatic shield;
a second coil, the second coil being inductively coupled to the first coil;
a second signal processor coupled to the second coil; and
a coil driver coupled to the first coil and configured to generate a carrier signal on the first coil.

2. The system of claim 1 wherein the first signal processor and the second signal processor communicate through modulation of the carrier signal.

3. The system of claim 1 wherein the first signal processor comprises a modulator configured to modulate data onto the carrier signal and the second signal processor comprises a demodulator configured to demodulate the carrier signal and output the data.

4. The system of claim 1 wherein the second signal processor comprises a modulator configured to modulate data onto the carrier signal and the first signal processor comprises a demodulator configured to demodulate the carrier signal and output the data.

5. The system of claim 1 wherein the electrostatic shield is inductively coupled to the first coil as a single turn secondary winding.

6. The system of claim 1 wherein the gap prevents the electrostatic shield from acting as a shorted turn.

7. The system of claim 1 wherein the electrostatic shield is adjacent to the outer surface of the first coil, surrounds the first coil circumferentially, and is open on both ends.

8. The system of claim 1 wherein the electrostatic shield is adjacent to the inner surface of the first coil, extends around the inner surface of the first coil circumferentially, and is open on both ends.

9. The system of claim 1 wherein the electrostatic shield has an outer portion and an inner portion, the outer portion is adjacent to the outer surface of the first coil and surrounds the first coil circumferentially, the inner portion is adjacent to the inner surface of the first coil and extends around the inner surface of the first coil circumferentially, and both the outer portion and the inner portion are open on both ends.

10. The system of claim 9 wherein the gap extends the axial length of both the outer portion and the inner portion of the electrostatic shield.

11. The apparatus of claim 1 wherein:
the electrostatic shield has a cylindrical or truncated conical structure that is open on both ends and which is coaxial with the first coil; and
the gap extends from one open end of the electrostatic shield to the other.

12. The system of claim 1 wherein a center tap of the electrostatic shield is connected to ground.

13. The system of claim 1 wherein the first coil and the electrostatic shield are configured to fit over a limb of a patient.

14. The system of claim 13 wherein the limb is a residual portion of an amputated limb.

15. The system of claim 13 wherein the electrostatic shield is positioned to reduce parasitic variations introduced on the first coil by the limb.

16. The system of claim 13 further comprising:
an implantable biological sensor providing sensor data to the second signal processor, wherein the second signal processor is configured to modulate the carrier signal with the sensor data, and the first signal processor demodulates the carrier signal and outputs received sensor data.

17. The system of claim 16 further comprising:
a prosthetic device with a prosthetic controller, wherein the prosthetic controller is coupled to the first signal processor and receives the received sensor data and generates control signals to actuate the prosthetic device.

18. A method of communicating between a first coil and a second coil, the first coil having an electrostatic shield, the first coil being inductively coupled with the electrostatic shield, the first coil being inductively coupled with the second coil, comprising:
generating a carrier signal on the first coil;
receiving an input data signal;
modulating the carrier signal with the data from the input data signal on the second coil;
demodulating the carrier signal on the electrostatic shield; and
outputting an output data signal comprising the data demodulated from the carrier signal.

19. The method of claim 18 wherein modulating the carrier signal on the second coil is changing the impedance presented to the first coil by the second coil.

20. The method of claim 18 wherein the input data signal is sensor data received from a biological sensor.

21. The method of claim 18 further comprising:
actuating a prosthetic device based on the output data signal.

22. A method of communicating between a first coil and a second coil, the first coil having an electrostatic shield, the first coil being inductively coupled with the electrostatic shield, the first coil being inductively coupled with the second coil, comprising:
generating a carrier signal on the first coil;
receiving an input data signal;
modulating the carrier signal with the data from the input data signal on the electrostatic shield;
demodulating the carrier signal on the second coil; and
outputting an output data signal comprising the data demodulated from the carrier signal.

23. The method of claim 22 wherein modulating the carrier signal on the electrostatic shield is changing the impedance presented to the first coil by the electrostatic shield.

24. A wireless power transfer and communication apparatus comprising:
a first coil;
a coil driver circuit, the coil driver circuit being coupled to the first coil and configured to generate a carrier signal on the first coil;
an electrostatic shield for the first coil, the electrostatic shield having a gap extending the axial length of the electrostatic shield, wherein the electrostatic shield is inductively coupled to the first coil; and
a demodulator connected across the gap of the electrostatic shield, wherein the demodulator demodulates the carrier signal.

25. The apparatus of claim 24 wherein the first coil inductively couples to a second coil, and wherein the carrier signal is modulated by changing the impedance of the second coil.

26. The apparatus of claim 24 further comprising:
an implantable biological sensor providing sensor data to a modulator, wherein the modulator is coupled to a second coil, the second coil being inductively coupled to the first coil, and wherein the modulator is configured to modulate the carrier signal with the sensor data.

27. The apparatus of claim 24 further comprising:
a prosthetic device with a prosthetic controller, wherein the prosthetic controller is coupled to the demodulator and generates control signals to actuate the prosthetic device based on the demodulated carrier signal.

28. The apparatus of claim 24 wherein the electrostatic shield is inductively coupled to the first coil as a single turn secondary coil.

29. The apparatus of claim 24 wherein the gap prevents the electrostatic shield from acting as a shorted turn.

30. The apparatus of claim 24 wherein:
the electrostatic shield has a cylindrical or truncated conical structure that is open on both ends and which is coaxial with th

Assignees

• Alfred E Mann Foundation For Scient Research
• The Alfred E Mann Foundation For Scient Research

Inventors

• Griffith Glen A

Classifications

• H02J2105/46

  Medical devices, medical implants or life supporting devices · CPC title

• A61F2002/704

  computer-controlled, e.g. robotic control · CPC title

• H02J50/12

  of the resonant type · CPC title

• A61B5/0031 Primary

  Implanted circuitry · CPC title

• A61B2560/0219

  of externally powered implanted units · CPC title