Pickup coil design for tight spaces and asymmetrical coupling

Patent metadata

Field	Value
Publication number	US-10186912-B2
Application number	US-201314027055-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 13, 2013
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

Systems and methods for wireless power transmission are described herein. In one aspect, a charging pad to transfer power wirelessly comprises a power antenna assembly configured to receive wireless power. The power antenna assembly is configured to charge the battery based on the received wireless power. The charging pad further comprises a ferrite layer assembly. The charging pad further a shielding layer defining a shape configured to receive a part of the host device and/or conform to a shape of a host device. The shielding layer can define a notch or can define a concave shape.

First claim

What is claimed is:

1. A device for receiving power wirelessly, comprising:
a power antenna assembly configured to receive wireless power from a transmit antenna, the power antenna assembly defining a first gap extending from a first surface to a second surface of, and through, the power antenna assembly, the first surface opposite the second surface, the power antenna assembly further configured to charge a battery based on the received wireless power;
a ferrite layer assembly defining a second extending from a first surface to a second surface of, and through, the ferrite layer assembly, the first surface opposite the second surface, wherein the ferrite layer assembly surrounds the second gap on all sides in a plane shared by the ferrite layer assembly and the second gap; and
a shielding layer configured to shield components other than the power antenna assembly and the ferrite layer assembly from the wireless power of the transmit antenna, the shielding layer protruding into the second gap, defining a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap.

2. The device of claim 1 , wherein the cavity corresponds to a protrusion on an exterior surface to which the shielding layer attaches.

3. The device of claim 1 , wherein the power antenna assembly comprises:
a first coil wound in a first direction;
a second coil coplanar with the first coil and wound in a second direction opposite the first direction; and
a third coil at least partially overlapping the first coil and at least partially overlapping the second coil,
wherein the second gap extends longitudinally along a center line of the third coil.

4. The device of claim 1 , wherein a width of the second gap is about 5% to about 30% of an inner width of a coil antenna of the antenna assembly.

5. The device of claim 1 , wherein a length of the second gap is less than about 90% of an inner length of a coil antenna of the antenna assembly.

6. The device of claim 1 , wherein the power antenna assembly is configured to receive a wireless flux in a predominate direction, wherein the cavity is aligned longitudinally with the predominate direction of the wireless flux.

7. The device of claim 1 , wherein the ferrite layer forms a channel extending from the second gap, wherein the channel has a width less than a width of the second gap.

8. The device of claim 1 , wherein:
the ferrite layer forms a channel extending from the second gap;
the channel has a width less than a width of the second gap; and
the channel is configured to house power lines of the power antenna assembly.

9. The device of claim 1 , wherein the power antenna assembly comprises a circular coil antenna configured to receive wireless flux in a substantially uniformly radial direction.

10. The device of claim 1 , wherein the power antenna assembly comprises a circular coil antenna configured to receive wireless flux in a substantially radial direction, wherein the second gap is substantially radially symmetric.

11. The device of claim 1 , wherein the shielding layer is configured to mechanically couple to a vehicle, the vehicle comprising the battery chargeable by the power antenna assembly.

12. The device of claim 1 , wherein the shielding layer is configured to mechanically couple to a vehicle, wherein the cavity of the shielding layer is configured to receive a protruding member of the vehicle.

13. The device of claim 1 , wherein the shielding layer is configured to mechanically couple to a vehicle, wherein the cavity of the shielding layer is configured to receive a movable member of the vehicle.

14. The device of claim 1 , wherein the ferrite layer comprises two or more tiles defining the second gap.

15. A device for wireless power transfer, the device comprising:
means for receiving wireless power from a wireless field generated by a transmit antenna, the means for receiving defining a first gap extending from a first surface to a second surface of, and through, the means for receiving wireless power, the first surface opposite the second surface and the means for receiving wireless power configured to charge a battery based on the received wireless power;
means for altering the wireless field defining a second gap extending from a first surface to a second surface of, and through, the means for altering, the first surface opposite the second surface, wherein the means for altering surrounds the second gap on all sides in a plane shared by the ferrite layer and the second gap; and
means for shielding means other than the means for receiving and the means for altering from the wireless field generated by the transmit antenna, the means for shielding protruding into the second gap, defining a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap.

16. The device of claim 15 , wherein the means for receiving comprises:
a first coil wound in a first direction;
a second coil coplanar with the first coil and wound in a second direction opposite the first direction; and
a third coil at least partially overlapping the first coil and at least partially overlapping the second coil,
wherein the second gap extends longitudinally along a center line of the third coil.

17. The device of claim 15 , wherein the means for receiving is configured to receive a wireless flux in a predominate direction, and the cavity is aligned longitudinally with the predominate direction of the wireless flux.

18. The device of claim 15 , wherein the means for shielding and for defining the cavity is configured to mechanically couple to a vehicle, and the cavity is configured to receive a protruding member of the vehicle.

19. A method of charging a battery via a charging pad, the method comprising:
receiving wireless power from a wireless field, generated by a transmit antenna, using an antenna assembly to provide power to charge the battery, the antenna assembly defining a first gap extending from a first surface to a second surface of, and through, the antenna assembly, the first surface opposite the second surface;
altering the wireless field using a ferrite layer, the ferrite layer wirelessly coupled to the antenna assembly, the ferrite layer defining a second gap extending from a first surface to a second surface of, and through, the ferrite layer, the first surface opposite the second surface, wherein the ferrite layer surrounds the second gap on all sides in a plane shared by the ferrite layer and the second gap; and
shielding components other than the antenna assembly and the ferrite layer from the wireless field generated by the transmit antenna using a shielding layer, wherein the shielding layer protrudes into the second gap, defines a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap, the charging pad comprising the antenna assembly, the ferrite layer, and the shielding layer.

20. The method of claim 19 , wherein the antenna assembly comprises:
a first coil wound in a first direction;
a second coil coplanar with the first coil and wound in a second direction opposite the first direction; and
a third coil formed on a plane separate from the second and first coil and at least partially covering the first coil and at least partially covering the second coil,
wherein the second gap extends longitudinally along a center line of the third coil.

21. The method of claim 19 , wherein the antenna assembly is configured to receive a wir

Assignees

• Qualcomm Inc

Inventors

• Stamenic Milenko
• Van Boheemen Edward L
• Islinger Simon
• Chlebosz Wojciech Adam
• Raabe Stefan
• Garcia Briz Alberto

Classifications

• H02J50/70 Primary

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H02J50/12

  of the resonant type · CPC title

• B60L2270/147

  electro magnetic [EMI] · CPC title