MAGNETIC FIELD DISTRUBTION IN WIRELESS POWER

• US 20150255987A1
• Filed: 03/05/2014
• Published: 09/10/2015
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Yang, Songnan, Koratikere Narayan, Janardhan, Konanur, Anand, Rosenfeld, Jonathan, Kasturi, Sreenivas, Lee, Kwan Ho, Karacaoglu, Ulun
• Granted Patent: US 9,685,792 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• 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 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 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 Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

Techniques of magnetic field distribution are described herein. The techniques may include forming a wireless charging component including a driving coil to receive a driven current generating a magnetic field. An outer turn of a parasitic coil may be formed, wherein the outer turn is adjacent to the driving coil. An inner turn of the parasitic coil may be formed, wherein an inductive coupling between the driving coil and the parasitic coil generates a redistribution of a portion of the magnetic field at the inner turn.

Claims

1. A method of forming a wireless component, comprising:

forming a driving coil to receive a driven current generating a magnetic field;

forming an outer turn of a parasitic coil, wherein the outer turn is adjacent to the driving coil; and

forming an inner turn of the parasitic coil, wherein an inductive coupling between the driving coil and the parasitic coil generates a redistribution of a portion of the magnetic field at the inner turn.

2. The method of claim 1, wherein the redistribution of the portion of magnetic field of the driving coil is based on a distance between the outer turn and the inner turn of the parasitic coil.

3. The method of claim 1, wherein the inductive coupling generates a current at the outer turn of the parasitic coil propagating in a direction opposite to a direction of the current in the driving coil.

4. The method of claim 1, wherein the parasitic coil is a first parasitic coil, the method comprising forming a second parasitic coil to further redistribute the magnetic field.

5. The method of claim 4, wherein the driving coil comprises multiple turns.

6. The method of claim 4, wherein a radius of the first parasitic coil is shorter than a radius of the driving coil, and wherein a radius of the second parasitic coil is shorter than the radius of the first parasitic coil.

7. The method of claim 1, wherein the driving coil and parasitic coil are concentric in relation to a center point.

8. The method of claim 1, the magnetic field distribution is configurable based on the disposition of the parasitic coil in relation to the driving coil.

9. The method of claim 1, wherein the redistribution of the magnetic field generates a substantially even magnetic field distribution in relation to a driving coil that that is not adjacent to a parasitic coil.

10. The method of claim 1, wherein the redistribution of the magnetic field is configurable based on the relative disposition of the driving coil to the parasitic coil.

11. The method of claim 1, wherein the parasitic coil comprises:

a circular parasitic coil;

a non-circular parasitic coil; and

any combination of the above.

12. The method of claim 1, comprising forming a tuning element in the parasitic coil to enable tuning flexibility of the parasitic coil.

13. A wireless component, comprising:

a driving coil to receive a driven current generating a magnetic field;

an outer turn of a parasitic coil disposed adjacent to the driving coil; and

an inner turn of the parasitic coil, wherein an inductive coupling between the driving coil and the parasitic coil generates a redistribution of a portion of the magnetic field at the inner turn.

14. The wireless component of claim 13, wherein the redistribution of the portion of magnetic field of the driving coil is based on a distance between the outer turn and the inner turn of the parasitic coil.

15. The wireless component of claim 13, wherein the inductive coupling generates a current at the outer turn of the parasitic coil propagating in a direction opposite to a direction of the current in the driving coil.

16. The wireless component of claim 13, wherein the parasitic coil is a first parasitic coil, the wireless charging component comprising a second parasitic coil to further redistribute the magnetic field.

17. The wireless component of claim 16, wherein a radius of the first parasitic coil is shorter than a radius of the driving coil, and wherein a radius of the second parasitic coil is shorter than the radius of the first parasitic coil.

18. The wireless component of claim 13, wherein the driving coil and parasitic coil are concentric in relation to a center point.

19. The wireless component of claim 13, the magnetic field distribution is configurable based on the disposition of the parasitic coil in relation to the driving coil.

20. The wireless component of claim 13, wherein the redistribution of the magnetic field generates a substantially even magnetic field distribution in relation to a driving coil that that is not adjacent to a parasitic coil.

21. The wireless component of claim 13, comprising a tuning element in the parasitic coil to enable tuning flexibility of the parasitic coil.

22. The wireless component of claim 13, wherein the redistribution of the magnetic field is configurable based on the relative disposition of the driving coil to the parasitic coil.

23. A wireless transmitter, comprising:

a driving coil to receive a driven current generating a magnetic field;

an outer turn of a parasitic coil disposed adjacent to the driving coil, and wherein an inductive coupling between the driving coil and the outer turn generates;

a current at the outer turn propagating in a direction opposite to a direction of the current in the driving coil; and

a reduction of the magnetic field at the driving coil; and

an inner turn of the parasitic coil to receive the current from the outer turn, wherein the inner turn is disposed to propagate the current propagates in a same direction as the driven current to generate a magnetic field that is smaller than the magnetic field of the driving coil.

24. The wireless transmitter of claim 23, comprising a distance between the outer turn and the inner turn of the parasitic coil, wherein a magnitude of the magnetic field of the inner turn is proportional to the distance.

25. The wireless transmitter of claim 23, wherein the parasitic coil is a first parasitic coil, comprising a second parasitic coil that is smaller than the first parasitic coil.

26. The wireless transmitter of claim 23, wherein the driving coil and parasitic coil are concentric in relation to a center point.

27. The wireless transmitter of claim 23, wherein a magnetic field distribution of the wireless power transmitter is configurable based on the disposition of the parasitic coil in relation to the driving coil.

28. The wireless transmitter of claim 23, wherein the distribution of the magnetic field is substantially even magnetic field distribution in relation to a driving coil that that is not adjacent to a parasitic coil.

29. The wireless transmitter of claim 23, wherein the redistribution of the magnetic field is configurable based on the relative disposition of the driving coil to the parasitic coil.

30. The wireless transmitter of claim 23, comprising a tuning element in the parasitic coil to enable tuning flexibility of the parasitic coil.

31. The wireless transmitter of claim 23, wherein the parasitic coil comprises:

a circular parasitic coil;

a non-circular parasitic coil; and

any combination of the above.