COUNTER WOUND INDUCTIVE POWER SUPPLY

• US 20130093252A1
• Filed: 04/06/2012
• Published: 04/18/2013
• Est. Priority Date: 04/08/2011
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Access Business Group International LLC (Alticor Incorporated)
• Inventors: Norconk, Matthew J., Schwannecke, Joshua K., Baarman, David W., Kuyvenhoven, Neil W., Moes, Benjamin C., Moore, Colin J.
• Granted Patent: US 9,496,081 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2200/20 Vehicles specially adapted for children, e.g. toy vehicles
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A contactless power supply is provided. The contactless power supply includes two or more primary coils for generating a region of cooperative magnetic flux generally therebetween. A portable device having a secondary coil can be positioned proximate this region of magnetic flux to receive wireless power from the contactless power supply. The spaced-apart primary coils can be wound in alternating directions about a common axis and driven in phase, or can be wound in a single direction about a common axis and driven approximately 180 degrees out of phase. The contactless power supply can include a plurality of primary coils in an adjustable array to accommodate multiple portable devices each with different secondary configurations and power consumption needs.

Claims

1. A contactless power supply for providing power to at least one remote device, comprising:

a first inductive primary to provide an electromagnetic flux when driven with a first time-varying current, the first inductive primary defining a first centerline axis;

a second inductive primary to provide an electromagnetic flux when driven with a second time-varying current, the second inductive primary defining a second centerline axis; and

a power transfer surface to receive the at least one remote device thereon, wherein the first and second inductive primaries are subjacent the power transfer surface and wherein the centerline axes are generally parallel to the power transfer surface, the first and second inductive primaries being operable to define a cumulative magnetic flux in a region of the power transfer surface generally between the first and second inductive primaries.

2. The contactless power supply of claim 1 wherein the first inductive primary is wound about a first direction and the second inductive primary is wound about a second direction different from the first direction.

3. The contactless power supply of claim 2 wherein the first and second inductive primaries are electrically coupled in series whereby the first and second time-varying currents are equal.

4. The contactless power supply of claim 1 further including:

a first driver electrically coupled to the first inductive primary to generate the first time-varying current; and

a second driver electrically coupled to the second inductive primary to generate the second time-varying current, wherein the first and second time-varying currents are substantially out of phase.

5. The contactless power supply of claim 1 further including ferromagnetic a core element, wherein the first and second inductive primaries are wound about the ferromagnetic core element.

6. The contactless power supply of claim 1 further including a diamagnetic element opposite the power transfer surface, wherein the first and second inductive primaries are positioned therebetween.

7. The contactless power supply of claim 1 further including a bobbin including first and second channels, wherein the first and second inductive primaries are wound about the bobbin within the first and second channels, respectively.

8. The contactless power supply of claim 7 wherein the bobbin is substantially planar.

9. The contactless power supply of claim 1 further including third and fourth coaxial inductive primaries that are orthogonal to the first and second inductive primaries.

10. The contactless power supply of claim 1 wherein:

the at least one remote device is positionable along a plurality of locations on the power transfer surface; and

the at least one remote device includes an inductive secondary generally orthogonal to the first and second inductive primaries.

11. A method for providing wireless power to a remote device, comprising:

providing a contactless power supply including a first plurality of inductive primaries wound about a first axis; and

driving first and second ones of the first plurality of inductive primaries with respective time-varying currents to provide the remote device with a first cumulative magnetic flux in a region generally between the first and second inductive primaries.

12. The method according to claim 11 further including:

measuring a current or a voltage in the first and second inductive primaries; and

driving the first and second inductive primaries to a balanced condition in which the current or the voltage in each of the first and second inductive primaries is substantially equal.

13. The method according to claim 12 wherein driving to a balanced condition includes varying one of the amplitude, the duty cycle, and the frequency of the time-varying current in one of the first and second inductive primaries.

14. The method according to claim 11 further including:

measuring a current or a voltage in the first and second inductive primaries; and

driving the first and second inductive primaries to an imbalanced condition in which the current or the voltage in each of the first and second inductive primaries is substantially dissimilar.

15. The method according to claim 14 wherein driving to an imbalanced condition includes varying one of the amplitude, the duty cycle, and the frequency of the time-varying current in one of the first and second inductive primaries.

16. The method according to claim 11 wherein the driving step includes:

driving the first inductive primary with a first time-varying current;

driving the second inductive primary with a second time-varying current;

varying the phase in at least one of the first and second time-varying currents to control the first cumulative magnetic flux provided to the remote device.

17. The method according to claim 11 wherein:

the first and second inductive primaries are wound in the same direction about the first axis; and

the respective time-varying currents are substantially out of phase.

18. The method according to claim 11 wherein the first inductive primary is wound in a first direction about the first axis and the second inductive primary is wound in a second direction about the first axis.

19. The method according to claim 11 further including:

providing a second plurality of inductive primaries wound about a second axis generally perpendicular to the first axis; and

driving first and second ones of the second plurality of inductive primaries with respective time varying currents to generate a second cumulative magnetic flux in the region generally occupied by the remote device.

20. The method according to claim 19 further including providing a power transfer surface for receipt of the remote device thereon, the first and second plurality of inductive primaries being generally subjacent the power transfer surface.

21. The method according to claim 11 wherein the respective time-varying currents include a first amplitude and a second amplitude different from the first amplitude.

22. A contactless power supply system comprising:

a remote device including an inductive secondary; and

a contactless power supply including a power transfer surface to receive the remote device thereon and including first and second coaxial inductive primaries subjacent the power transfer surface and defining a centerline axis generally parallel to the power transfer surface,

wherein the inductive secondary is orthogonal to the first and second inductive primaries, and wherein the first and second inductive primaries are operable to generate a cumulative magnetic flux in the region of the power transfer surface generally occupied by the orthogonal inductive secondary.

23. The contactless power supply system of claim 22 wherein the first inductive primary is wound about a first direction and the second inductive primary is wound about a second direction different from the first direction.

24. The contactless power supply system of claim 23 wherein the first and second inductive primaries are electrically coupled in series.

25. The contactless power supply system of claim 22 further including:

a first driver electrically coupled to the first inductive primary to generate the first time-varying current; and

a second driver electrically coupled to the second inductive primary to generate the second time-varying current, wherein the first and second time-varying currents are substantially out of phase.

26. The contactless power supply system of claim 22 further including ferromagnetic a core element, wherein the first and second inductive primaries are wound about the ferromagnetic core element and wherein the ferromagnetic core element guides the cumulative magnetic flux toward the region of the power transfer surface generally occupied by the inductive secondary.

27. The contactless power supply system of claim 22 further including a diamagnetic element subjacent the first and second inductive primaries to increase the cumulative magnetic flux in the region of the power transfer surface generally occupied by the inductive secondary.

28. The contactless power supply system of claim 27 wherein the diamagnetic element is substantially planar and is generally coextensive with the power transfer surface, the first and second inductive primaries being generally positioned between the diamagnetic element and the power transfer surface.

29. The contactless power supply system of claim 22 further including a substantially planar bobbin, wherein the first and second inductive primaries are wound about the substantially planar bobbin.

30. A method for providing wireless power to remote device including an inductive secondary, the method comprising:

providing a first primary coil array including a first plurality of spaced-apart inductive primaries wound about a first axis;

driving a first one of the plurality of inductive primaries with a current in a first direction; and

driving a second one of the plurality of inductive primaries with a current in a second direction, wherein the inductive secondary is generally orthogonal to the first and second inductive primaries, and wherein the first and second inductive primaries are generally tangentially aligned with the inductive secondary to provide a cumulative magnetic flux to the inductive secondary.

31. The method according to claim 30 further including:

providing a second primary coil array including a second plurality of spaced-apart inductive primaries would about a second axis generally orthogonal to the first axis;

driving a first one of the second plurality of inductive primaries with a current in a first direction; and

driving a second one of the second plurality of inductive primaries with a current in a second direction, wherein the first and second ones of the second plurality of inductive primaries are tangentially aligned with the inductive secondary to contribute to the cumulative magnetic flux to the inductive secondary.

32. The method according to claim 30 further including monitoring a characteristic of power in the first and second inductive primaries to detect the presence of the inductive secondary in proximity to the first and second inductive primaries.

33. The method according to claim 32 wherein the characteristic of power includes at least one of current, voltage and phase.

34. The method according to claim 30 wherein the first primary coil array includes a ferromagnetic core element.

35. The method according to claim 30 wherein the first primary coil array includes a substantially planar bobbin.

36. The method according to claim 30 wherein the inductive secondary is substantially orthogonal to the first plurality of inductive primaries.

37. The method according to claim 30 further including providing a generally planar power transfer surface to removably receive the remote device thereon.