Apparatus for reducing electric field and radiation field in magnetic resonant coupling coils or magnetic induction device for wireless energy transfer

• US 8,466,375 B2
• Filed: 12/21/2010
• Issued: 06/18/2013
• Est. Priority Date: 08/25/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Cho, In-Kui, Yun, Je-Hoon, Kim, Seong-Min, Moon, Jung-Ick
• Primary Examiner(s): NGO, HUNG V
• Application Number:
  US12/974,901
• Publication Number:
  US 20120049986A1
• Time in Patent Office: 910 Days
• Field of Search: 174/386, 174/396, 307/104, 333/194, 320/108
• US Class Current: 174/386
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01P 7/005 Helical resonators; Spiral resonators
• CPC Class Codes: H01Q 17/00 Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
• CPC Class Codes: H05K 9/0052 Shielding other than Faraday cages

Abstract

An apparatus for reducing a radiation power and an electric field includes a transmission end energy transfer unit configured to include a feeding roof and a transmission coil, a receiving end energy transfer unit configured to be symmetrically separated from the transmission end energy transfer unit at a predetermined distance, and to include a receiving roof and a receiving coil, a first electric field shield configured to be made of a nonconductor, to have a shape surrounding the transmission end energy transfer unit, and to have an empty space of a predetermined first thickness; and a second electric field shield to be made of a nonconductor, to have a shape surrounding the receiving end energy transfer unit, and to have an empty space of a predetermined second thickness, wherein the empty spaces are filled with a dielectric material for shielding the electric field.

Claims

1. An apparatus for reducing an electric field and a radiation power in a magnetic resonator for wireless energy transfer, comprising:

a transmission end energy transfer unit configured to include a feeding roof and a transmission coil;

a receiving end energy transfer unit configured to have a symmetrical structure to the transmission end energy transfer unit, to be separated from the transmission end energy transfer unit at a predetermined distance, and to include a receiving roof and a receiving coil;

a first electric field shield configured to be made of a nonconductor, to have a shape surrounding the transmission end energy transfer unit, and to have an empty space of a predetermined first thickness; and

a second electric field shield to be made of a nonconductor, to have a shape surrounding the receiving end energy transfer unit, and to have an empty space of a predetermined second thickness,

wherein the empty spaces of the first and second electric field shields are filled with a dielectric material for shielding the electric field.

2. The apparatus of claim 1, wherein the first and second electric field shields have a shape of hexahedron.

3. The apparatus of claim 1, wherein the first and second electric field shields has a globular shape.

4. The apparatus of claim 1, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a circular spiral structure.

5. The apparatus of claim 1, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a square spiral structure.

6. The apparatus of claim 1, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a circular coil structure.

7. The apparatus of claim 1, further comprising:

a first electric field shield disposed at a rear side in a 180°

direction from the transmission end energy transfer unit,

wherein the first electric field shield is made of a nonconductor and has an area greater than the transmission coil and the feeding roof, and

wherein the first electric field shield internally includes a dielectric having a dielectric loss higher than about 0.1.

8. The apparatus of claim 1, further comprising:

a second electric field shield disposed at a rear side in a 180°

direction from the receiving end energy transfer unit,

wherein the second electric field shield is made of a nonconductor and has an area greater than the receiving coil and the receiving roof, and

wherein the second electric field shield internally includes a dielectric having a dielectric loss higher than about 0.1.

9. The apparatus of claim 1, further comprising:

a third electric field shield disposed at a gap between the transmission end energy transfer unit and the receiving end energy transfer unit,

wherein the third electric field shield is made of a nonconductor, and

wherein the third electric field shield internally includes a dielectric having a dielectric loss equal to or higher than about 0.1.

10. An apparatus for reducing an electric field and a radiation power in a magnetic resonator for wireless energy transfer, comprising:

a transmission end energy transfer unit configured to includes a feeding roof and a transmission coil;

a receiving end energy transfer unit configured to be formed symmetrical to the transmission end energy transfer unit, to be separated at a predetermined distance from the transmission end energy transfer unit, and to include a receiving coil and a receiving roof;

a first electric field shield configured to be disposed at a rear side in a 180°

direction from the transmission end energy transfer unit, to be made of a nonconductor, and to have an area greater than the transmission coil and the feeding roof;

a second electric field shield configured to be disposed at a rear side in a 180°

direction from the receiving end energy transfer unit, to be made of a nonconductor, and to have an area greater than the receiving coil and the receiving roof,

wherein the first electric field shield and the second electric field shield internally include a dielectric that shields an electric field.

11. The apparatus of claim 10, further comprising:

a third electric field shield configured to be disposed a gap between the transmission end energy transfer unit and the receiving end energy transfer unit,

wherein the third electric field internally include a dielectric that shields an electric field.

12. The apparatus of claim 10, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a circular spiral structure.

13. The apparatus of claim 10, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a square spiral structure.

14. The apparatus of claim 10, wherein the transmission end energy transfer unit and the receiving end energy transfer unit include a resonance coil, and

wherein the resonance coil is made as a conductor plate having a predetermined width and a predetermined thickness and the resonance coil is configured as a circular coil structure.

15. A method for reducing an electric field and a radiation power in a magnetic resonator for wireless energy transfer, wherein the magnetic resonator includes a transmission end energy transfer unit having a feeding roof and a transmission coil and a receiving end energy transfer unit symmetrically separated from the transmission end energy transfer unit and having a receiving coil and a receiving roof, the method comprising:

shielding an electric field of the transmission end energy transfer unit by filling a dielectric at an empty space between an inner wall and an outer wall of a first electric field shield made of a nonconductor and having a shape entirely surrounding the transmission end energy transfer unit; and

shielding an electric field of the receiving end energy transfer unit by filling a dielectric at an empty space between an inner wall and an outer wall of a second electric field shield made of a nonconductor and having a shape entirely surrounding the receiving end energy transfer unit.

16. The method of claim 15, wherein the first electric field shield and the second electric field shield are configured to have a shape of hexahedron.

17. The method of claim 15, wherein the first electric field shield and the second electric field shield are configured to have a globular shape.

18. A method for reducing an electric field and a radiation power in a magnetic resonator for wireless energy transfer, wherein the magnetic resonator includes a transmission end energy transfer unit having a feeding roof and a transmission coil and a receiving end energy transfer unit symmetrically separated from the transmission end energy transfer unit and having a receiving coil and a receiving roof, the method comprising:

disposing a first electric field shield at a rear side in a 180°

direction from the transmission end energy transfer unit, wherein the first electric field shield has an area greater than the transmission coil and the feeding roof, is made of a nonconductor, and internally includes a dielectric shielding an electric field; and

disposing a second electric field shield at a rear side in a 180°

direction from the receiving end energy transfer unit, wherein the second electric field shield has an area greater than the receiving coil and the receiving roof, is made of a nonconductor, and internally includes a dielectric shielding an electric field.

19. The method of claim 18, wherein the first electric field shield and the second electric field shield are configured to have a shape of hexahedron.

20. The method of claim 18, further comprising:

disposing a third electric field shield at a gap between the transmission end energy transfer unit and the receiving end energy transfer unit,

wherein the third electric field is configured to have a hexahedron shape and internally includes a dielectric that shield an electric field.