Large area type complex magnetic field shielding sheet and wireless power transfer module including the same

Patent metadata

Field	Value
Publication number	US-2020328024-A1
Application number	US-201916956681-A
Country	US
Kind code	A1
Filing date	Mar 12, 2019
Priority date	Mar 13, 2018
Publication date	Oct 15, 2020
Grant date	—

Abstract

Provided are a large area type complex magnetic field shielding sheet and a wireless power transfer module including the same. A large area type complex magnetic field shielding sheet wherein at least one of an overall width, an overall length, and a diameter is 100 mm or more may include a main shielding layer arranged so that a plurality of ferrite block bodies each having a predetermined area are adjacent to each other, and an auxiliary shielding layer formed of at least one magnetic sheet having a predetermined area and laminated on the main shielding layer through an adhesive layer, wherein a boundary region between two ferrite block bodies disposed to be adjacent each other is disposed to be located in an inner region of the magnetic sheet and thus a magnetic field which leaks into a gap between the two ferrite block bodies is blocked by the magnetic sheet.

First claim

1 . A large area type complex magnetic field shielding sheet of which at least one of an overall width, an overall length, and a diameter is 100 mm or more, comprising:
a main shielding layer arranged so that a plurality of ferrite block bodies each having a predetermined area are adjacent to each other; and an auxiliary shielding layer formed of at least one magnetic sheet having a predetermined area and laminated on one surface of the main shielding layer through an adhesive layer, wherein a boundary region between two ferrite block bodies disposed to be adjacent each other is disposed to be located in an inner region of the magnetic sheet and thus a magnetic field which leaks into a gap between the two ferrite block bodies is blocked by the magnetic sheet.

2 . The large area type complex magnetic field shielding sheet of claim 1 , wherein:
the magnetic sheet is an amorphous ribbon sheet; and the ferrite block body is formed of a Mn—Zn ferrite.

3 . The large area type complex magnetic field shielding sheet of claim 1 , wherein the plurality of ferrite block bodies are arranged in an m×n matrix structure in one surface of the auxiliary shielding layer, wherein m and n are natural numbers.

4 . The large area type complex magnetic field shielding sheet of claim 1 , wherein the auxiliary shielding layer is provided as a pair to be disposed on each of an upper surface and a lower surface of the main shielding layer.

5 . The large area type complex magnetic field shielding sheet of claim 1 , wherein:
the auxiliary shielding layer and the main shielding layer are each provided in plural; and the plurality of auxiliary shielding layers and the plurality of main shielding layers are alternately laminated in a lamination direction.

6 . The large area type complex magnetic field shielding sheet of claim 1 , wherein:
the auxiliary shielding layer and the main shielding layer are each provided in plural; and each of the plurality of main shielding layers is disposed to be located between two auxiliary shielding layers.

7 . The large area type complex magnetic field shielding sheet of claim 1 , wherein at least a portion of the gap formed between the two ferrite block bodies disposed to be adjacent each other is formed not parallel to a thickness direction of the auxiliary shielding layer.

8 . The large area type complex magnetic field shielding sheet of claim 1 , further comprising a plate-shaped heat dissipation plate disposed on one surface of the auxiliary shielding layer.

9 . The large area type complex magnetic field shielding sheet of claim 8 , wherein the heat dissipation plate is formed of a metallic material.

10 . The large area type complex magnetic field shielding sheet of claim 8 , wherein the heat dissipation plate is formed of heat dissipation plastic.

11 . The large area type complex magnetic field shielding sheet of claim 1 , wherein a thickness of the auxiliary shielding layer is half or less of an overall thickness of the main shielding layer.

12 . The large area type complex magnetic field shielding sheet of claim 1 , wherein the magnetic sheet is flaked and separated into a plurality of fine pieces.

13 . A wireless power transfer module comprising:
a large area type complex magnetic field shielding sheet of which at least one of an overall width, an overall length, and a diameter is 100 mm or more; and at least one wireless power transfer antenna disposed on one surface of the large area type complex magnetic field shielding sheet, wherein the large area type complex magnetic field shielding sheet comprises: a main shielding layer arranged so that a plurality of ferrite block bodies each having a predetermined area are adjacent to each other; and an auxiliary shielding layer formed of at least one magnetic sheet having a predetermined area and laminated on one surface of the main shielding layer through an adhesive layer, wherein a boundary region between two ferrite block bodies disposed to be adjacent each other is disposed to be located in an inner region of the magnetic sheet and thus a magnetic field which leaks into a gap between the two ferrite block bodies is blocked by the magnetic sheet.

14 . The wireless power transfer module of claim 13 , wherein:
the magnetic sheet is an amorphous ribbon sheet; and the ferrite block body is formed of a Mn—Zn ferrite.

15 . The wireless power transfer module of claim 13 , wherein the plurality of ferrite block bodies are arranged in an m×n matrix structure in one surface of the auxiliary shielding layer, wherein m and n are natural numbers.

16 . The wireless power transfer module of claim 13 , wherein the auxiliary shielding layer is provided as a pair to be disposed on each of an upper surface and a lower surface of the main shielding layer.

17 . The wireless power transfer module of claim 13 , wherein:
the auxiliary shielding layer and the main shielding layer are each provided in plural; and the plurality of auxiliary shielding layers and the plurality of main shielding layers are alternately laminated in a lamination direction.

18 . The wireless power transfer module of claim 13 , wherein:
the auxiliary shielding layer and the main shielding layer are each provided in plural; and each of the plurality of main shielding layers is disposed to be located between two auxiliary shielding layers.

19 . The wireless power transfer module of claim 13 , wherein at least a portion of the gap formed between the two ferrite block bodies disposed to be adjacent each other is formed not parallel to a thickness direction of the auxiliary shielding layer.

20 . The wireless power transfer module of claim 13 , further comprising a plate-shaped heat dissipation plate disposed on one surface of the auxiliary shielding layer.

Assignees

• Amosense Co Ltd

Inventors

• Kim Chol Han
• Jang Kil Jae

Classifications

• Y10T428/32

  Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer · CPC title

• H01F27/22 Primary

  Cooling by heat conduction through solid or powdered fillings · CPC title

• H01F27/366 Primary

  made of ferromagnetic material · CPC title

• B60L2270/147

  electro magnetic [EMI] · CPC title

• B60L53/30

  Constructional details of charging stations · CPC title