Magnetic field distrubtion in wireless power

• US 9,685,792 B2
• Filed: 03/05/2014
• Issued: 06/20/2017
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Koratikere Narayan, Janardhan, Yang, Songnan, Lee, Kwan Ho, Karacaoglu, Ulun, Rosenfeld, Jonathan, Kasturi, Sreenivas, Konanur, Anand
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pham, Duc M
• Application Number:
  US14/197,598
• Publication Number:
  US 20150255987A1
• Time in Patent Office: 1,203 Days
• Field of Search: 307104
• 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 surrounded by the driving coil, wherein the outer turn is adjacent to the driving coil and inductively coupled to the driving coil to generate a first parasitic current that is out of phase with the driven current; and

forming an inner turn of the parasitic coil, wherein the inner turn is conductively coupled to the outer turn to generate a second parasitic current that is out of phase with the first parasitic current and in phase with the driven current.

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

3. 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.

4. The method of claim 3, wherein the driving coil comprises multiple turns.

5. The method of claim 3, 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.

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

7. The method of claim 1, wherein a magnetic field distribution of the wireless component is configurable based on a disposition of the parasitic coil in relation to the driving coil.

8. The method of claim 1, wherein the parasitic coil causes a redistribution of the magnetic field of the driving coil and 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.

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

10. 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.

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

12. A wireless component, comprising:

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

an outer turn of a parasitic coil surrounded by the driving coil, wherein the outer turn is adjacent to the driving coil and inductively coupled to the driving coil to generate a first parasitic current that is out of phase with the driven current; and

an inner turn of the parasitic coil, wherein the inner turn is conductively coupled to the outer turn to generate a second parasitic current that is out of phase with the first parasitic current and in phase with the driven current.

13. The wireless component of claim 12, wherein the parasitic coil redistributes a portion of the magnetic field of the driving coil based on a distance between the outer turn and the inner turn of the parasitic coil.

14. The wireless component of claim 12, wherein the parasitic coil is a first parasitic coil, the wireless component comprising a second parasitic coil to further redistribute the magnetic field.

15. The wireless component of claim 14, 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.

16. The wireless component of claim 12, wherein the driving coil and parasitic coil are concentric in relation to a center point.

17. The wireless component of claim 12, wherein a magnetic field distribution of the wireless component is configurable based on a disposition of the parasitic coil in relation to the driving coil.

18. The wireless component of claim 12, wherein the parasitic coil causes a redistribution of the magnetic field of the driving coil and wherein the redistribution of the magnetic field generates a substantially even magnetic field distribution in relation to a driving coil that is not adjacent to a parasitic coil.

19. The wireless component of claim 12, comprising a tuning element in the parasitic coil to enable tuning flexibility of the parasitic coil.

20. The wireless component of claim 12, wherein the parasitic coil causes a redistribution of the magnetic field of the driving coil and wherein the redistribution of the magnetic field is configurable based on a relative disposition of the driving coil to the parasitic coil.

21. A wireless transmitter, comprising:

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

an outer turn of a parasitic coil surrounded by the driving coil wherein the outer turn is 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 driven current in the driving coil; and

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

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

22. The wireless transmitter of claim 21, wherein a magnitude of the magnetic field of the inner turn is proportional to a distance between the outer turn and the inner turn of the parasitic coil.

23. The wireless transmitter of claim 21, wherein the parasitic coil is a first parasitic coil, the wireless transmitter comprising a second parasitic coil that is smaller than the first parasitic coil.

24. The wireless transmitter of claim 21, wherein the driving coil and parasitic coil are concentric in relation to a center point.

25. The wireless transmitter of claim 21, wherein a magnetic field distribution of the wireless transmitter is configurable based on a disposition of the parasitic coil in relation to the driving coil.

26. The wireless transmitter of claim 21, wherein a distribution of the magnetic field is substantially even in relation to a driving coil that is not adjacent to a parasitic coil.

27. The wireless transmitter of claim 21, wherein a redistribution of the magnetic field is configurable based on a relative disposition of the driving coil to the parasitic coil.

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

29. The wireless transmitter of claim 21, wherein the parasitic coil comprises:

a circular parasitic coil;

a non-circular parasitic coil; and

any combination of the above.