Universal apparatus for wireless device charging using radio frequency (RF) energy

• US 9,087,637 B2
• Filed: 07/29/2012
• Issued: 07/21/2015
• Est. Priority Date: 07/29/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jenwatanavet, Jatupum, Low, Zhen Ning, Ozaki, Ernest T.
• Primary Examiner(s): Dinh, Paul
• Assistant Examiner(s): Aisaka, Bryce
• Application Number:
  US13/561,071
• Publication Number:
  US 20140028251A1
• Time in Patent Office: 1,087 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10

Abstract

An apparatus for wireless charging using radio frequency (RF) energy includes a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil.

Claims

1. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between 10% and 90%.

2. The apparatus of claim 1, wherein the magnetic material and the metal material are located adjacent to the charger coil, the first portion of the magnetic material underlying the charger coil being located between the charger coil and the metal material.

3. The apparatus of claim 1, wherein the first portion of the magnetic material underlying the charger coil is adjacent to and in contact with the metal material underlying the charger coil.

4. The apparatus of claim 1, further comprising metal material located adjacent to the second portion of magnetic material overlying the charger coil.

5. The apparatus of claim 1, further comprising:

a recess configured to receive a charge-receiving device, the recess having a planar bottom surface and side walls extending substantially orthogonal to the planar bottom surface, the charger coil located along the side walls; and

a third portion of magnetic material located about an outer periphery of the charger coil.

6. The apparatus of claim 5, further comprising metal material surrounding the third portion of magnetic material.

7. The apparatus of claim 1, further comprising a charger portion in which the charger coil is located, the first portion of the magnetic material embedded in the charger portion.

8. The apparatus of claim 1, wherein charging energy is transferred at a frequency of approximately 6.78 MHz.

9. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane by at least 42 amperes/meter (A/m).

10. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane by at least 21 amperes/meter (A/m).

11. The apparatus of claim 1, wherein the magnetic material and the metal material prevent the magnetic field from extending beyond the plane defined by the major surface of the magnetic material and the metal material.

12. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 75%.

13. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 85%.

14. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 20%.

15. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 30%.

16. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 40%.

17. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 50%.

18. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 60%.

19. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 70%.

20. The apparatus of claim 1, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 80%.

33. The apparatus of claim 6, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane by at least 42 amperes/meter (A/m).

34. The apparatus of claim 6, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane by at least 21 amperes/meter (A/m).

35. The apparatus of claim 6, wherein the magnetic material and the metal material prevent the magnetic field from extending beyond the plane defined by the major surface of the magnetic material and the metal material.

36. The apparatus of claim 6, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 75%.

37. The apparatus of claim 6, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 85%.

38. The apparatus of claim 6, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, and/or at least 80%.

21. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane from approximately 50 amperes/meter (A/m) to approximately 7.14 A/m.

22. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between approximately 42 amperes/meter (A/m) and approximately 21 A/m.

23. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane approximately 75%.

24. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane approximately 85%.

25. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger coil configured to produce RF charging energy as a magnetic field, the charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger coil and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between approximately 75% and 85%.

26. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between 10% and 90%.

27. The apparatus of claim 26, wherein the magnetic material and the metal material are located adjacent to the charger coil, the first portion of the magnetic material underlying the charger coil being located between the charger coil and the metal material.

28. The apparatus of claim 26, wherein the first portion of the magnetic material underlying the charger coil is adjacent to and in contact with the metal material underlying the charger coil.

29. The apparatus of claim 26, further comprising metal material located adjacent to the second portion of magnetic material overlying the charger coil.

30. The apparatus of claim 26, wherein:

the first and second charging areas each comprise a recess configured to receive a charge-receiving device, each recess having a planar bottom surface and side walls extending substantially orthogonal to the planar bottom surface, the charger coil located along the side walls; and

a third portion of magnetic material located about an outer periphery of the charger coil.

31. The apparatus of claim 30, further comprising metal material surrounding the third portion of magnetic material.

32. The apparatus of claim 26, wherein charging energy is transferred at a frequency of approximately 6.78 MHz.

39. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane from approximately 50 amperes/meter (A/m) to approximately 7.14 A/m.

40. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between approximately 42 amperes/meter (A/m) and approximately 21 A/m.

41. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane approximately 75%.

42. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane approximately 85%.

43. An apparatus for wireless charging using radio frequency (RF) energy, comprising:

a charger portion having at least first and second charging areas, the first and second charging areas located in a common plane, the first and second charging areas each having at least one charger coil for wirelessly charging a charge-receiving device placed in proximity to any of the first and second charging areas, the at least one charger coil in each of the first and second charging areas comprising a respective winding configured to produce RF charging energy as a magnetic field, the at least one charger coil located proximate to a magnetic material and a metal material, the magnetic material and the metal material located to attenuate the magnetic field generated by the charger coil beyond a plane defined by a major surface of the magnetic material and the metal material, a first portion of the magnetic material underlying the charger portion and a second portion of magnetic material overlying the charger coil, wherein the magnetic material and the metal material attenuate the magnetic field beyond the plane between approximately 75% and 85%.