REDUCING MAGNETIC FIELD VARIATION IN A CHARGING DEVICE

• US 20150303733A1
• Filed: 06/30/2014
• Published: 10/22/2015
• Est. Priority Date: 04/18/2014
• Status: Abandoned Application

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Yang, Songnan, Xiao, Bin, Koratikere Narayan, Janardhan, Kasturi, Sreenivas, Elkhouly, Essam
• Application Number:
  US14/319,802
• Publication Number:
  US 20150303733A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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: H01F 41/071 Winding coils of special form winding conductors onto closed formers or cores H01F41/08
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

Systems and methods may provide for a wireless charging device having a concave-shaped charging platform defining a charging area. The wireless charging device may include a three-dimensional transmitter coil, and at least one additional transmitter coil having a non-uniform spacing within the concave-shaped charging platform to reduce magnetic field variations associated with the three-dimensional transmitter coil.

Claims

1. A wireless charging device, comprising:

a three-dimensional transmitter coil arranged about a charging platform, wherein the three-dimensional transmitter coil comprises;

a turn of the coil to conduct an electrical current; and

a plurality of additional coil turns to conduct the electrical current, the plurality of coil turns being spaced with a non-uniform spacing to reduce magnetic field variations associated with the three-dimensional transmitter coil in a direction normal to a surface of the charging platform.

2. The wireless charging device of claim 1, wherein the plurality of coil turns comprise:

a first coil turn of the three-dimensional transmitter coil having a diameter of about 173 millimeters; and

a second coil turn of the three-dimensional transmitter coil coupled to the first coil turn, the second coil turn having a diameter of about 164.6 millimeters.

3. The wireless charging device of claim 2, wherein the plurality of coil turns comprise:

a third coil turn of the three-dimensional transmitter coil coupled to the second coil turn, the second coil turn having a diameter of about 155.2 millimeters; and

a fourth coil turn of the three-dimensional transmitter coil coupled to the third coil turn, the fourth coil turn having a diameter of about 144.8 millimeters.

4. The wireless charging device of claim 3, wherein the plurality of coil turns comprise:

a fifth coil turn of the three-dimensional transmitter coil coupled to the fourth coil turn, the fifth coil turn having a diameter of about 133.5 millimeters; and

a sixth coil turn of the three-dimensional transmitter coil coupled to the firth coil turn, the sixth coil turn having a diameter of about 121 millimeters.

5. The wireless charging device of claim 4, wherein the plurality of coil turns comprise a seventh coil turn of the three-dimensional transmitter coil coupled to the sixth portion, the seventh coil turn having a diameter of about 98 millimeters.

6. The wireless charging device of claim 5, wherein the plurality of coil turns comprise an eighth coil turn of the three-dimensional transmitter coil coupled to the seventh coil turn, the eighth coil turn having a diameter of about 66 millimeters.

7. The wireless charging device of claim 5, wherein the non-uniform spacing is based on a ratio of the dimensions of each turn of the plurality of coil turns.

8. The wireless charging device of claim 1, wherein charging platform comprises a concave shape, and wherein the concave shape is formed with a semicircle about 100 millimeters from a center point of the concave shape and having an angle of about 120 degrees.

9. The wireless charging device of claim 1, further comprising:

a parasitic coil to generate a redistribution of a portion of a magnetic field associated with a driven current of the transmitting coil; and

a tuning element to tune the parasitic coil, the tuning element comprising a capacitor, wherein the redistribution is configurable based on a capacitance of the tuning element.

10. The wireless charging device of claim 1, further comprising:

a plurality of additional parasitic coils to generate a redistribution of a portion of the magnetic field associated with the driven current of the transmitting coil; and

a plurality of additional tuning elements each being coupled to a respective additional parasitic coil.

11. A method of forming a wireless charging device, comprising:

forming a charging platform defining a charging area; and

forming a three-dimensional transmitter coil arranged about the charging platform, wherein the three-dimensional transmitter coil comprises;

a turn of the coil to carry an electrical current; and

a plurality of additional coil turns to carry the electrical current, the plurality of coil turns being spaced with a non-uniform spacing to reduce magnetic field variations associated with the three-dimensional transmitter coil in a direction normal to a surface of the charging platform.

12. The method of claim 11, wherein the plurality of coil turns comprise:

a first coil turn of the three-dimensional transmitter coil having a diameter of about 173 millimeters; and

a second coil turn of the three-dimensional transmitter coil coupled to the first coil turn, the second coil turn having a diameter of about 164.6 millimeters.

13. The method of claim 12, wherein the plurality of coil turns comprise:

a third coil turn of the three-dimensional transmitter coil coupled to the second coil turn, the second coil turn having a diameter of about 155.2 millimeters; and

a fourth coil turn of the three-dimensional transmitter coil coupled to the third coil turn, the fourth coil turn having a diameter of about 144.8 millimeters.

14. The method of claim 13, wherein the plurality of coil turns comprise:

a fifth coil turn of the three-dimensional transmitter coil coupled to the fourth coil turn, the fifth coil turn having a diameter of about 133.5 millimeters; and

a sixth coil turn of the three-dimensional transmitter coil coupled to the firth coil turn, the sixth coil turn having a diameter of about 121 millimeters.

15. The method of claim 14, wherein the coil turns comprise:

a seventh coil turn of the three-dimensional transmitter coil coupled to the sixth portion, the seventh coil turn having a diameter of 98 millimeters; and

an eighth coil turn of the three-dimensional transmitter coil coupled to the seventh coil turn, the eighth coil turn having a diameter of about 66 millimeters.

16. The method of claim 15, further comprising determining a ratio of the dimensions of each turn of the plurality of coil turns, wherein alternate spacing between the plurality of coil turns may be formed based on the ratio.

17. The method of claim 11, further comprising:

identifying a coil structure having a plurality of angles of each coil turn from an axis extending through a center of the coil;

determining a magnetic field variation of coil structure; and

adjusting the plurality of angles based on a result of a cost function indicating optimized uniformity of the magnetic field.

18. The method of claim 11, wherein the charging platform is formed having a concave shape, wherein the concave shape is formed with a semicircle of about 100 millimeters from a center point of the concave shape and having an angle of about 120 degrees.

19. The method of claim 11, comprising:

forming a parasitic coil to generate a redistribution of a portion of a magnetic field associated with a driven current of the transmitting coil; and

forming a tuning element to tune the parasitic coil, the tuning element comprising a capacitor, wherein the redistribution is configurable based on a capacitance of the tuning element.

20. A wireless charging system, comprising:

a charging platform defining a charging area; and

a three-dimensional transmitter coil arranged about the charging platform, wherein the three-dimensional transmitter coil comprises;

a turn of the coil to carry an electrical current; and

a plurality of additional coil turns to carry the electrical current, the plurality of coil turns being spaced with a non-uniform spacing to reduce magnetic field variations associated with the three-dimensional transmitter coil in a direction normal to a surface of the charging platform.

21. The wireless charging system of claim 20, wherein the plurality of coil turns comprise:

a first coil turn of the three-dimensional transmitter coil having a diameter of about 173 millimeters;

a second coil turn of the three-dimensional transmitter coil coupled to the first coil turn, the second coil turn having a diameter of about 164.6 millimeters;

a third coil turn of the three-dimensional transmitter coil coupled to the second coil turn, the second coil turn having a diameter of about 155.2 millimeters;

a fourth coil turn of the three-dimensional transmitter coil coupled to the third coil turn, the fourth coil turn having a diameter of about 144.8 millimeters;

a fifth coil turn of the three-dimensional transmitter coil coupled to the fourth coil turn, the fifth coil turn having a diameter of about 133.5 millimeters;

a sixth coil turn of the three-dimensional transmitter coil coupled to the firth coil turn, the sixth coil turn having a diameter of about 121 millimeters;

a seventh coil turn of the three-dimensional transmitter coil coupled to the sixth portion, the seventh coil turn having a diameter of 98 millimeters; and

an eighth coil turn of the three-dimensional transmitter coil coupled to the seventh coil turn, the eighth coil turn having a diameter of about 66 millimeters.

22. The wireless charging system of claim 20, wherein the dimensions of the non-uniform spacing is based on a ratio of the dimensions of one turn to another turn of the plurality of coil turns, and wherein the dimensions are scalable based on the ratio.

23. The wireless charging system of claim 20, wherein the charging platform is a concave charging platform, and the non-uniform spacing is to reduce magnetic field variation a direction normal to a surface of the concave charging platform.