Magnetic shielding member and wireless power receiver including the same
A wireless power receiver is disclosed. The wireless power receiver includes a reception coil for wirelessly receiving AC power, a plurality of shielding members disposed on the reception coil for blocking magnetism, and an adhesive member for adhering the shielding members and the reception coil to each other, wherein the shielding members are made of different materials.
1. A wireless power receiver comprising:
a reception coil configured to wirelessly receive AC power;
a first shielding member that is a magnetic shielding member having a thickness of 17 μm to 25 μm;
a second shielding member that is a soft magnetic shielding member having a thickness of 0.1 mm or more;
a first adhesive member disposed between the first shielding member and the second shielding member;
a first flexible insulating cover layer disposed between the reception coil and the first and second shielding members; and
a second flexible insulating cover layer disposed on the first adhesive member and the first and second shielding members,
wherein the first adhesive member and the first and second shielding members are disposed between the first and second flexible insulating cover layers,
wherein the first shielding member and the second shielding member are made of different materials and configured to block a magnetic field,
wherein a ratio of the thickness of the first shielding member to the thickness of the second shielding member is approximately 1:5,
wherein the first shielding member has a circular shape and a diameter of 30 mm or less,
wherein the first adhesive member and the first and second magnetic shielding members are fully sealed between the first and second flexible insulating cover layers, and
wherein a combination of the first and second shielding members has a magnetic permeability characterized in that a real part has a value of 300 or less and an imaginary part has a value of 20 or less in a low-frequency band of 300 KHz or less.
2. The wireless power receiver according to claim 1 , wherein the first shielding member is one selected from between a nano-crystal shielding member and an amorphous shielding member.
3. The wireless power receiver according to claim 1 , wherein the second shielding member is a sendust block formed by mixing and melting insulated flake powder and insulation resin powder.
4. The wireless power receiver according to claim 3 , wherein the insulation resin powder is a polyimide-based or phenol-based resin powder.
5. The wireless power receiver according to claim 3 , wherein the sendust block is injection molded by pouring a molten mixture of the insulated flake powder and the insulation resin powder in a horizontal direction.
6. The wireless power receiver according to claim 1 , wherein the reception coil is one selected from between a patterned coil and a wound type coil.
7. The wireless power receiver according to claim 1 , wherein the first and second flexible insulating cover layers both have a circular shape and a diameter that is larger than the diameter of the first shielding member.
8. The wireless power receiver according to claim 1 , wherein an outer edge of the first flexible insulating cover layer is adhered to an outer edge of the second flexible insulating cover layers, and
wherein the first adhesive member and the first and second magnetic shielding members are fully sealed between the first and second flexible insulating cover layers.
9. The wireless power receiver according to claim 1 , wherein the second shielding member includes flake powder that is uniformly arranged in the horizontal direction.
10. A wireless power receiver comprising:
a reception coil configured to wirelessly receive AC power;
a first shielding member that is a magnetic shielding member having a thickness of 17 μm to 25 μm;
a second shielding member that is a soft magnetic shielding member having a thickness of 0.1 mm or more;
a first adhesive member disposed between the first shielding member and the second shielding member; and
a first flexible insulating cover layer disposed between the reception coil and the first and second shielding members,
wherein the first shielding member configured to block an imaginary part of the AC power differently than the second shielding member,
wherein a ratio of the thickness of the first shielding member to the thickness of the second shielding member is approximately 1:5,
wherein the first shielding member has a circular shape and a diameter of 30 mm or less,
wherein the first adhesive member and the first and second magnetic shielding members are fully sealed between the first and second flexible insulating cover layers, and
wherein a combination of the first and second shielding members has a magnetic permeability characterized in that a real part has a value of 300 or less and an imaginary part has a value of 20 or less in a low-frequency band of 300 KHz or less.
11. The wireless power receiver according to claim 10 , wherein the second shielding member is a sendust block formed by mixing and melting insulated flake powder and insulation resin powder.
12. The wireless power receiver according to claim 10 , wherein the reception coil is one selected from between a patterned coil and a wound type coil.
13. The wireless power receiver according to claim 10 , wherein the first shielding member is one selected from between a nano-crystal shielding member and an amorphous shielding member.
14. A wireless power receiver comprising:
a reception coil configured to wirelessly receive AC power;
a first shielding member that is a magnetic shielding member having a thickness of 17 μm to 25 μm;
a second shielding member that is a soft magnetic shielding member having a thickness of 0.1 mm or more;
a first adhesive member disposed between the first shielding member and the second shielding member and adhering the first shielding member and the second shielding member to each other;
a second adhesive member disposed between the first shielding member and the reception coil and adhering the first shielding member and the reception coil to each other,
wherein the second adhesive member is a flexible insulating layer and electrically isolates the reception coil from the first shielding member,
wherein the first shielding member and the second shielding member are made of different materials and configured to block a magnetic field,
wherein a ratio of the thickness of the first shielding member to the thickness of the second shielding member is approximately 1:5,
wherein the first shielding member has a circular shape and a diameter of 30 mm or less,
wherein the first adhesive member and the first and second magnetic shielding members are fully sealed between the first and second flexible insulating cover layers, and
wherein a combination of the first and second shielding members has a magnetic permeability characterized in that a real part has a value of 300 or less and an imaginary part has a value of 20 or less in a low-frequency band of 300 KHz or less.
15. The wireless power receiver according to claim 14 , wherein the second shielding member is a sendust block formed by mixing and melting insulated flake powder and insulation resin powder.
16. The wireless power receiver according to claim 15 , wherein the sendust block is injection molded by pouring a molten mixture of the insulated flake powder and the insulation resin powder in a horizontal direction.
17. The wireless power receiver according to claim 14 , wherein the first shielding member is one selected from between a nano-crystal shielding member and an amorphous shielding member.
18. The wireless power receiver according to claim 14 , wherein second adhesive member directly contacts the reception coil.