Tiled wireless charging coil solution for extended active area

Patent metadata

Field	Value
Publication number	US-2016164332-A1
Application number	US-201514672114-A
Country	US
Kind code	A1
Filing date	Mar 28, 2015
Priority date	Dec 4, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

The disclosure generally relates to as method and apparatus for wireless charging station. In one embodiment, the disclosure provides an overlapping (or tiled) layout of a plurality of coils. Each coil may have a symmetric or an asymmetric turn layout. The disclosure also provides, design optimization techniques configured to determine the optimal tile overlap distance and/or coil, size to provide a substantially uniform electro-magnetic field over the surface of the wireless charging station.

First claim

What is claimed is:

1 . A transmitter charging station, comprising:
a first coil having a first layout geometry to provide a first resonant magnetic field; a second coil having a second layout geometry to provide a second resonant magnetic field, the second coil overlapping the first coil such that a combination of the first and the second magnetic fields provides a substantially uniform magnetic field above an overlapping plane of the first and the second coils.

2 . The charging station of claim 1 , wherein the first coil and the second coils are arranged as partially overlapping tiles.

3 . The charging station of claim 1 , wherein the first coil and the second coils are connected in series.

4 . The charging station of claim 1 , wherein at least one of the first coil or the second coil defines an asymmetric or skewed coil turns.

5 . The charging station of claim 1 , further comprising a third coil having a third layout geometry.

6 . The charging station of claim 4 , wherein the third coil at least partially overlaps the second coil to extend the magnetic field of the first and tie second coil.

7 . The charging station of claim 1 , wherein the second coil overlaps the first coil in a range of about 10-50% of a length of one of the first or the second coils.

8 . The charging station of claim 1 , wherein an outer-most turn of the first coil extends beyond the inner most turn of the second coil.

9 . The charging station of claim 1 , wherein the first coil defines a symmetric geometry and the second coil defines an asymmetric geometry.

10 . A wireless charging station, comprising:
a first cod having a first resonance frequency tuner; a second roil having a second resonance frequency tuner; a capacitor connecting the first and the second coils; a power source connected to the first coil and the second coil; and a controller to configure at least one of the first Or the second frequency tuners to provide substantially similar resonance frequency from each of the first and the second coils.

11 . The wireless charging station of claim 10 , wherein at least one of the first coil or the second coil defines an asymmetric or skewed coil turns.

12 . The wireless charging station of claim 10 , wherein the first and the second coils are connected in series.

13 . The wireless charging station of claim 10 , wherein the first coil is positioned to overlap the second coil.

14 . The wireless charging station of claim 13 , further comprising a third coil wherein the third coil overlaps one or more of the first or the second coils.

15 . The wireless charging station of claim 10 , wherein an outer most turn of the first coil extends beyond the inner most turn of the second coil.

16 . The wireless charging station of claim 10 , wherein the first coil defines a symmetric geometry and the second roil defines an asymmetric geometry.

17 . A method to provide a substantially uniform magnetic field over a power transmission unit (PTU), the method comprising:
forming a first coil to provide a first resonance frequency; forming a second coil to provide a second resonance frequency; tuning one or more of the first coil or the second coil to provide, substantially similar resonance frequencies; overlapping first and the second coils to provide a substantially uniform magnetic field over the first and the second coils.

18 . The method of claim 17 , wherein the first coil has a multi-sided layout in which at least one side is curved outwardly.

19 . The method of claim 17 further comprising connecting the first and the second coils in series.

20 . The method of claim 17 , further comprising interposing a tuning capacitor between the first and the second coils.

21 . The method of claim 17 , further comprising determining an overlap distance as a function of a combined magnetic field strength of the first coil and the second coil at the overlap region.

22 . The method of claim 17 , further comprising tuning the first resonance frequency of the first coil by tuning the capacitance of at least one capacitor associated with the first coil.

23 . The method of claim 20 , further comprising tuning, a first capacitor associated with the first coil and a second capacitor associated with the second coil such that the tuning capacitor has substantially same value as either the first or the second capacitors.

24 . The method of claim 23 , further comprising connecting the first capacitor, second capacitor and the tuning capacitor in series.

25 . The method of claim 17 , further comprising a power receiving unit (PRU) proximally exposed to the substantially uniform magnetic field to thereby an receive electrical field charge from the PTU.

Assignees

• Intel Corp

Inventors

• Elkhouly Essam
• Yang Songnan

Classifications

• H02J7/025 Primary

  Electricity · mapped topic

• H01F38/14 Primary

  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

• H02J50/402

  the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas · CPC title