Transcutaneous power transmission utilizing non-planar resonators

• US 9,079,043 B2
• Filed: 11/21/2011
• Issued: 07/14/2015
• Est. Priority Date: 11/21/2011
• Status: Active Grant

• Current Assignee: TC1 LLC (Abbott Laboratories Incorporated)
• Original Assignee: Thoratec LLC
• Inventors: Stark, Joseph, Burke, Edward
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): DHILLON, JAGDEEP S
• Application Number:
  US13/301,717
• Publication Number:
  US 20130127253A1
• Time in Patent Office: 1,331 Days
• Field of Search: 307/104, 307/149, 307/9.1, 307/86, 307/64, 307/65, 307/60, 607/119, 607/33, 607/4, 607/9, 607/30, 607/47, 607/61, 333/219.2, 333/175, 385/37, 385/12, 324/318, 324/322
• US Class Current: 1/1
• CPC Class Codes: A61M 2205/3515 using magnetic means
• CPC Class Codes: A61M 2205/3523 using telemetric means
• CPC Class Codes: A61M 2205/8243 by induction
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/873 specially adapted for wireless or transcutaneous energy transfer [TET], e.g. inductive charging
• CPC Class Codes: A61N 1/37229 Shape or location of the implanted or external antenna
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A system for omni-orientational wireless energy transfer is described. A transmitter unit has a transmitter resonator with a coil that is configured to be coupled to a power supply to wirelessly transmit power to a receiver unit. A receiver unit has a receiver resonator with a coil coupled to a device load. At least one of the resonators is a non-planar resonator that spans a non-degenerate two-dimensional surface having at least one concave portion.

Claims

1. A system for omni-orientational wireless energy transfer comprising:

a transmitter unit comprising a first electromagnetic resonator with a first winding configured to be coupled to a power supply and to generate a magnetic flux; and

a receiver unit comprising a second electromagnetic resonator located at an operating distance from the first electromagnetic resonator and having a second winding configured to be coupled to a device load and to carry an electrical current;

wherein at least one of the first or second electromagnetic resonators comprises a respective winding that conforms to a non-planar two-dimensional surface with at least one curved portion occupying three spatial dimensions such that the magnetic flux is directed from the first electromagnetic resonator to the second electromagnetic resonator to induce the electrical current when the first and second electromagnetic resonators are at the operating distance regardless of a relative spatial orientation of the first and second electromagnetic resonators, and wherein a shape of the non-planar two-dimensional surface is configured to shape the magnetic flux to increase a coupling between the electromagnetic resonators over different orientations of the electromagnetic resonators.

2. The system of claim 1, wherein the non-planar two-dimensional surface comprises a paraboloid surface having at least two concave portions.

3. The system of claim 2, wherein the paraboloid surface is a hyperbolic paraboloid surface.

4. The system of claim 1, wherein the non-planar two-dimensional surface comprises a non-degenerate quadric surface defined by an equation in three-dimensional Euclidean space, the equation being one of Ax²+By²+Cz²=D or Ax² +By²+Cz=0, wherein A, B, C, and D are non-zero numbers.

5. The system of claim 1, wherein a power transfer between the transmitter unit and the receiver unit at the operating distance is at least 25% of a maximum power transfer at the operating distance, regardless of the relative spatial orientation.

6. The system of claim 5, wherein the transmitter unit delivers power in a range of 5 Watts to 20 Watts at the operating distance, and wherein the separation distance is in a range of 2.5 cm to 35 cm.

7. The system of claim 1, wherein the system has a resonant frequency in a range of 100 kHz to 10 MHz.

8. The system of claim 1, wherein at least one of the windings comprises a Litz wire coil that conforms to the non-planar two-dimensional surface.

9. The system of claim 1, wherein at least one of the electromagnetic resonators includes a magnetic core having the non-planar two-dimensional surface, and the corresponding winding comprises a Litz wire that is wrapped around the magnetic core for directing the magnetic flux.

10. The system of claim 1, wherein at least one of the electromagnetic resonators further comprises a capacitor coupled to the corresponding winding.

11. The system of claim 1, wherein at least one of the electromagnetic resonators is coupled to a tunable resistor or a network of resistive elements to tune a quality factor “

Q”

of the system to maximize a voltage gain at the receiver unit.

12. The system of claim 1, wherein the second electromagnetic resonator is configured for subcutaneous placement within a human.

13. The system of claim 1, wherein the device load comprises a rechargeable power storage device in an implantable medical device.

14. The system of claim 13, wherein the implantable medical device is a ventricular assist device.

15. The system of claim 1, wherein the first electromagnetic resonator is part of a piece of wearable clothing or a wearable accessory.

16. The system of claim 1, wherein the first electromagnetic resonator is embedded in a stationary object.

17. The system of claim 1, wherein at least one of the electromagnetic resonators is coupled to a tunable capacitor or a network of capacitive elements to tune the resonant frequency of the system to maximize a voltage gain at the receiver unit.

18. The system of claim 1, wherein the receiver and transmitter units further comprises respective communications circuitry to establish a communications channel between the receiver unit and the transmitter unit to communicate system information used to modulate a power output of the transmitter unit.

19. The system of claim 1, wherein the transmitter unit further comprises a flux concentrator to direct the magnetic flux from the transmitter unit towards the receiver unit.

59. The system of claim 1 being a transcutaneous energy transfer system, and wherein the first electromagnetic resonator comprises the winding that conforms to the non-planar two-dimensional surface.

61. The system of claim 1, wherein the first winding includes a plurality of loops that form an outline of the non-planar two-dimensional surface, wherein the non-planar two-dimensional surface includes a rim around a depth axis, wherein a first cross-section of the non-planar two-dimensional surface taken through the rim and along the depth axis includes a first concavity facing a first direction, and wherein a second cross-section of the non-planar two-dimensional surface taken through the rim and orthogonal to the first cross-section includes a second concavity facing a second direction which is different than the first direction.

20. A method for omni-orientational wireless energy transfer, the method comprising:

generating a magnetic flux by a first electromagnetic resonator having a first winding coupled to a power supply; and

placing a second electromagnetic resonator at an operating distance from the first electromagnetic resonator to induce an electrical current in a second winding of the second electromagnetic resonator, the second winding coupled to an electrical load;

wherein at least one of the first or second electromagnetic resonators comprises a respective winding that conforms to a non-planar two-dimensional surface with at least one curved portion occupying three spatial dimensions such that the magnetic flux is directed from the first electromagnetic resonator to the second electromagnetic resonator to induce the electrical current when the first and second electromagnetic resonators are at the operating distance regardless of a relative spatial orientation of the first and second electromagnetic resonators, and wherein a shape of the non-planar two-dimensional surface is configured to shape the magnetic flux to increase a coupling between the electromagnetic resonators over different orientations of the electromagnetic resonators.

21. The method of claim 20, wherein the non-planar two-dimensional surface comprises a paraboloid surface having at least two concave portions.

22. The method of claim 21, wherein the paraboloid surface is a hyperbolic paraboloid surface.

23. The method of claim 20, wherein the non-planar two-dimensional surface comprises a non-degenerate quadric surface defined by an equation in three-dimensional Euclidean space, the equation being one of Ax²+By²+Cz²=D or Ax² +By²+Cz=0, wherein A, B, C, and D are non-zero numbers.

24. The method of claim 20, wherein an achievable power transfer between the first winding and the second winding at the operating distance is at least 25% of a maximum power transfer at the operating distance, regardless of the relative spatial orientation.

25. The method of claim 24, wherein a power transfer in a range of 5 W to 20 W is achievable at the operating distance, and wherein the operating distance is in a range of 2.5 cm to 35 cm.

26. The method of claim 20, wherein at least one of the first and second electromagnetic resonators further comprises a tunable capacitor or a network of capacitive elements coupled to the corresponding winding, and the method further comprises:

tuning the tunable capacitor or the network of capacitive elements to adjust a first resonant frequency of one of the electromagnetic resonators to substantially match a second resonant frequency of the other electromagnetic resonator.

27. The method of claim 20, wherein the first electromagnetic resonator and the second electromagnetic resonator each has a resonant frequency in a range of 100 kHz to 10 MHz.

28. The method of claim 20, wherein the second winding is configured for subcutaneous placement within a human.

29. The method of claim 20, wherein the second winding is coupled to an implantable medical device.

30. The method of claim 29, wherein the implantable medical device is a ventricular assist device.

31. The method of claim 20, wherein at least one of the electromagnetic resonators is coupled to a tunable resistor or a network of resistive elements, and the method further comprises configuring the tunable resistor or the network of resistive elements to change a quality factor “

Q”

of that electromagnetic resonator to maximize a voltage gain at the second electromagnetic resonator.

32. The method of claim 20, further comprising establishing a communications channel between the first and second electromagnetic resonators to communicate information used to modulate a power output of the first electromagnetic resonator.

33. The method of claim 20, further comprising directing the magnetic flux from the first electromagnetic resonator towards the second electromagnetic resonator with a flux concentrator.

60. The method of claim 20 being for transcutaneous energy transfer, wherein the first electromagnetic resonator comprises the winding that conforms to the non-planar two-dimensional surface with at least one curved portion.

62. The method of claim 20, wherein the shape of the non-planar two-dimensional surface is predetermined, wherein the non-planar two-dimensional surface includes a rim around a depth axis, wherein a first cross-section of the non-planar two-dimensional surface taken through the rim and along the depth axis includes a first concavity facing a first direction, and wherein a second cross-section of the non-planar two-dimensional surface taken through the rim and orthogonal to the first cross-section includes a second concavity facing a second direction opposite to the first direction.

34. A transmitter unit for use in an omni-orientational wireless energy transfer system to wirelessly transfer energy to a receiver unit, the transmitter unit comprising:

a non-planar electromagnetic resonator with a transmitter winding that conforms to a non-planar two-dimensional surface with at least one curved portion occupying three spatial dimensions to direct a magnetic flux over an operating distance towards a receiver unit, wherein the magnetic flux induces an electrical current in a receiving winding of the receiver unit when the non-planar electromagnetic resonator and the receiving winding are at the operating distance regardless of a relative spatial orientation of the non-planar electromagnetic resonator and the receiving winding, and wherein a shape of the non-planar two-dimensional surface is configured to shape the magnetic flux to increase a coupling between the non-planar electromagnetic resonator and the receiver unit over different orientations of the non-planar electromagnetic resonator and the receiver unit; and

a power circuitry coupled to the transmitter winding, wherein the power circuitry is configured to be electrically connected to a power supply source to generate the magnetic flux.

35. The transmitter unit of claim 34, wherein the non-planar two-dimensional surface comprises a paraboloid surface having at least two concave portions.

36. The transmitter unit of claim 35, wherein the paraboloid surface is a hyperbolic paraboloid surface.

37. The transmitter unit of claim 34, wherein the non-planar two-dimensional surface comprises a non-degenerate quadric surface defined by an equation in three-dimensional Euclidean space, the equation being one of Ax²+By²+Cz²=D or Ax² +By²+Cz =0, wherein A, B, C, and D are non-zero numbers.

38. The transmitter unit of claim 34, wherein the non-planar electromagnetic resonator has a resonant frequency in a range of 100 kHz to 10 MHz.

39. The transmitter unit of claim 34, wherein the transmitter winding comprises a Litz wire coil that conforms to the non-planar two-dimensional surface.

40. The transmitter unit of claim 34, wherein the non-planar electromagnetic resonator includes a magnetic core having the non-planar two-dimensional surface, and the transmitter winding comprises a Litz wire that is wrapped around the magnetic core for directing the magnetic flux.

41. The transmitter unit of claim 34, further comprising a tunable capacitor or a network of capacitive elements to tune the resonant frequency of the non-planar electromagnetic resonator.

42. The transmitter unit of claim 34, wherein the transmitter unit is part of a piece of wearable clothing or a wearable accessory.

43. The transmitter unit of claim 34, wherein the transmitter unit is embedded in a stationary object.

44. The transmitter unit of claim 34, further comprising a tunable resistor or a network of resistive elements coupled to the non-planar electromagnetic resonator to tune a quality factor “

Q”

of the non-planar electromagnetic resonator to maximize a voltage gain at the receiver unit.

45. The transmitter unit of claim 34, further comprising a communications circuitry coupled to the power circuitry to communicate system information with the receiver unit to modulate a power output of the transmitter unit.

46. The transmitter unit of claim 34, further comprising a flux concentrator to direct the magnetic flux from the non-planar electromagnetic resonator towards the receiver unit.

63. The transmitter unit of claim 34, wherein the non-planar two-dimensional surface includes a rim around a depth axis, wherein a first cross-section of the non-planar two-dimensional surface taken through the rim and along the depth axis includes a first concavity facing a first direction along the depth axis, and wherein a second cross-section of the non-planar two-dimensional surface taken through the rim and orthogonal to the first cross-section includes a second concavity facing a second direction along the depth axis opposite to the first direction.

47. A receiver unit for use in an omni-orientational wireless energy transfer system to receive wirelessly transferred energy from a transmitter unit, the receiver unit comprising:

a non-planar electromagnetic resonator with a winding that conforms to a non-planar two-dimensional surface with at least one curved portion to receive a magnetic flux from a transmitter unit over an operating distance, wherein the magnetic flux induces an electrical current in the winding when the non-planar electromagnetic resonator and the transmitter unit are at the operating distance regardless of a relative spatial orientation of the non-planar electromagnetic resonator and the transmitter unit, and wherein a shape of the non-planar two-dimensional surface is configured to shape the magnetic flux to increase a coupling between the non-planar electromagnetic resonator and the transmitter unit over different orientations of the non-planar electromagnetic resonator and the transmitter unit; and

an electrical load coupled to the winding to receive the electrical current from the winding.

48. The receiver unit of claim 47, wherein the non-planar two-dimensional surface comprises a paraboloid surface having at least two concave portions.

49. The receiver unit of claim 48, wherein the paraboloid surface is a hyperbolic paraboloid surface.

50. The receiver unit of claim 47, wherein the non-planar two-dimensional surface comprises a non-degenerate quadric surface defined by an equation in three-dimensional Euclidean space, the equation being one of Ax²+By²+Cz² =D or Ax²+By²+Cz =0, wherein A, B, C, and D are non-zero numbers.

51. The receiver unit of claim 47, wherein the non-planar electromagnetic resonator has a resonant frequency in a range of 100 kHz to 10 MHz.

52. The receiver unit of claim 47, wherein the winding comprises a Litz wire coil that conforms to the non-planar two-dimensional surface.

53. The receiver unit of claim 47, wherein the non-planar electromagnetic resonator includes a magnetic core having the non-planar two-dimensional surface, and the winding comprises a Litz wire that is wrapped around the magnetic core for directing the magnetic flux.

54. The receiver unit of claim 47, further comprising a tunable capacitor or a network of capacitive elements to tune the resonant frequency of the non-planar electromagnetic resonator.

55. The receiver unit of claim 47, wherein the electrical load comprises a rechargeable power storage device in an implantable medical device.

56. The receiver unit of claim 47, wherein the implantable medical device is a ventricular assist device.

57. The receiver unit of claim 47, further comprising a tunable resistor or a network of resistive elements coupled to the non-planar electromagnetic resonator to tune a quality factor “

Q”

of the non-planar electromagnetic resonator to maximize a voltage gain of the receiver unit.

58. The receiver unit of claim 47, further comprising a communications circuitry coupled to the electrical load to communicate system information with the transmitter unit to modulate a power output of the transmitter unit.

64. The receiver unit of claim 47, wherein the non-planar two-dimensional surface includes a rim around a depth axis, wherein a first cross-section of the non-planar two-dimensional surface taken through the rim and along the depth axis includes a first concavity having a first concave segment continuous with a second concave segment, and wherein the first concave segment and the second concave segment are on opposite sides of the depth axis.