Patent ID: 9595381
Date: 2017-03-14
CPC Classifications: H01F,H02J,H04B

Claim:
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 having a first permeability; and a second shielding unit having a second permeability; wherein the second shielding unit is disposed on the first shielding unit; wherein the first shielding unit changes a transmission path of a portion of a magnetic field generated from a transmission coil of the wireless power transmission apparatus by the first permeability; wherein the second shielding unit shields the portion of the magnetic field that has passed through the first shielding unit due to the second permeability; wherein each of the first permeability and the second permeability is expressed as a complex number having a real component and an imaginary component; wherein the real component value of the first permeability is greater than the imaginary component value of the first permeability, and the imaginary component value of the second permeability is greater than the real component value of the second permeability; wherein the magnetic field is generated to transmit the power to the wireless power reception apparatus; wherein the first shielding unit and the second shielding unit are disposed opposite to a direction in which the transmission coil transmits the power; 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; wherein the second shielding unit absorbs the portion of the magnetic field that has passed through the first shielding unit to discharge the magnetic field as heat; 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 that has passed through the first shielding unit to discharge the magnetic field as heat; and 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.