SHIELDING APPARATUS AND WIRELESS POWER TRANSMISSION APPARATUS

• US 20130099589A1
• Filed: 10/24/2012
• Published: 04/25/2013
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: AN, Jeong Wook
• Granted Patent: US 9,595,381 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• CPC Class Codes: H01F 27/366 made of ferromagnetic 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: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed are a shielding apparatus and a wireless power transmission apparatus. The shielding apparatus included in a wireless power transmission apparatus for transmitting power to a wireless power reception apparatus in wireless includes a first shielding unit changing a transmission path of a portion of a magnetic field generated from a transmission coil of the wireless power transmission apparatus, and a second shielding unit shielding the portion of the magnetic field which has passed through the first shielding unit. The second shielding unit is placed on the first shielding unit. A real component value of permeability of the first shielding unit is greater than an imaginary component value of the permeability of the first shielding unit, and an imaginary component value of permeability of the second shielding unit is greater than a real component value of the permeability of the second shielding unit.

Claims

1. A shielding apparatus included in a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus, the shielding apparatus comprising:

a first shielding unit changing a transmission path of a portion of a magnetic field generated from a transmission coil of the wireless power transmission apparatus; and

a second shielding unit shielding the portion of the magnetic field which has passed through the first shielding unit,

wherein the second shielding is placed on the first shielding unit,

wherein a real component value of permeability of the first shielding unit is greater than an imaginary component value of the permeability of the first shielding unit, and an imaginary component value of permeability of the second shielding unit is greater than a real component value of the permeability of the second shielding unit.

2. The shielding apparatus of claim 1, wherein the first shielding unit transmits the portion of the magnetic field to the wireless power reception apparatus by changing the transmission path of the portion of the magnetic field.

3. The shielding apparatus of claim 1, wherein the second shielding unit absorbs the portion of the magnetic field which has passed through the first shielding unit to discharge the magnetic field as heat.

4. The shielding apparatus of claim 1, wherein the real component value of each permeability represents an extent to change the transmission path of the magnetic field, and the imaginary component value of each permeability represents an extent to absorb the portion of the magnetic field which has passed through the first shielding unit to discharge the magnetic field as heat.

5. The shielding apparatus of claim 1, wherein the real component value of the permeability of the first shielding unit is in a range of 10 times to 1000 times greater than the imaginary component value of the permeability of the first shielding unit, and the imaginary component value of the permeability of the second shielding unit is in a range of one time to 10 times greater than the real component value of the permeability of the second shielding unit.

6. The shielding apparatus of claim 1, wherein the real and imaginary component values of each permeability are in a range of 30 to 5000.

7. The shielding apparatus of claim 1, wherein the first shielding unit and the second shielding unit include different types of magnetic substances.

8. The shielding apparatus of claim 7, wherein the first and second shielding units include one of spinel, hexa, sandust, and permalloy magnetic substances.

9. The shielding apparatus of claim 1, wherein the first and second shielding units are bonded to each other through a compression method or an adhesive method.

10. The shielding apparatus of claim 1, wherein the first and second shielding units are bonded to each other through a thin film deposition method.

11. A wireless power transmission apparatus for transmitting power to a wireless power reception apparatus in wireless, the wireless power transmission apparatus comprising:

a transmission unit receiving power from a power source and transferring a magnetic field generated from a transmission coil to a reception coil of the wireless power reception apparatus through a non-radiation method; and

a shielding device including a first shielding unit changing a transmission path of a portion of the magnetic field generated from the transmission coil, and a second shielding unit is placed on the first shielding unit and shielding the portion of the magnetic field which has passed through the first shielding unit,

wherein a real component value of permeability of the first shielding unit is greater than an imaginary component value of the permeability of the first shielding unit, and an imaginary component value of permeability of the second shielding unit is greater than a real component value of the permeability of the second shielding unit.

12. The wireless power transmission apparatus of claim 11, wherein the first shielding unit transmits the portion of the magnetic field to the wireless power reception apparatus by changing the transmission path of the portion of the magnetic field.

13. The wireless power transmission apparatus of claim 11, wherein the second shielding unit absorbs the portion of the magnetic field which has passed through the first shielding unit to discharge the magnetic field as heat.

14. The wireless power transmission apparatus of claim 11, wherein the real component value of each permeability represents an extent to change the transmission path of the magnetic field generated from the transmission coil, and the imaginary component value of each permeability represents an extent to absorb the portion of the magnetic field which has passed through the first shielding unit to discharge the magnetic field as heat.

15. The wireless power transmission apparatus of claim 11, wherein the real component value of the permeability of the first shielding unit is in a range of 10 times to 1000 times greater than the imaginary component value of the permeability of the first shielding unit, and the imaginary component value of the permeability of the second shielding unit is in a range of one time to 10 times greater than the real component value of the permeability of the second shielding unit.

16. The wireless power transmission apparatus of claim 11, wherein the transmission unit transmits the power to the wireless power reception apparatus by using electromagnetic induction.

17. The wireless power transmission apparatus of claim 11, wherein the transmission unit transmits the power to the wireless power reception apparatus by using reactance.

18. A shielding apparatus included in a transmission apparatus communicating with a reception apparatus by using a magnetic field, the shielding apparatus comprising:

a first shielding unit changing a transmission path of a portion of a magnetic field generated from the transmission apparatus; and

a second shielding unit placed on the first shielding unit and shielding the portion of the magnetic field which has passed through the first shielding unit,

wherein a real component value of permeability of the first shielding unit is greater than an imaginary component value of the permeability of the first shielding unit, and an imaginary component value of permeability of the second shielding unit is greater than a real component value of the permeability of the second shielding unit.

19. The shielding apparatus of claim 18, wherein the first shielding unit transmits the portion of the magnetic field to the wireless power reception apparatus by changing the transmission path of the portion of the magnetic field, and the second shielding unit absorbs the portion of the magnetic field which has passed through the first shielding unit to discharge the magnetic field as heat.

20. The shielding apparatus of claim 19, wherein the transmission apparatus communicates with the reception apparatus by using at least one of an radio-frequency identification method, an near field communication method, and a keyless entry method.