KR101751119B1 - Magnetic sheet for wireless power charger system - Google Patents

Magnetic sheet for wireless power charger system Download PDF

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Publication number
KR101751119B1
KR101751119B1 KR1020150121471A KR20150121471A KR101751119B1 KR 101751119 B1 KR101751119 B1 KR 101751119B1 KR 1020150121471 A KR1020150121471 A KR 1020150121471A KR 20150121471 A KR20150121471 A KR 20150121471A KR 101751119 B1 KR101751119 B1 KR 101751119B1
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KR
South Korea
Prior art keywords
magnetic
atomic
core loss
amorphous
electrode layer
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KR1020150121471A
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Korean (ko)
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KR20160137306A (en
Inventor
이승민
정종호
조중영
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삼성전기주식회사
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Priority to US15/065,384 priority Critical patent/US10020671B2/en
Publication of KR20160137306A publication Critical patent/KR20160137306A/en
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Publication of KR101751119B1 publication Critical patent/KR101751119B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
    • H01F10/20—Ferrites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H02J17/00—
    • H02J7/025—

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

According to the present invention, A plurality of magnetic layers disposed on the electrode layer; And a plurality of core loss reduction members disposed between the electrode layer and the magnetic layer or between the magnetic layers, each of the core loss reducing members being formed of at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite A plurality of adhesive layers dispersedly contained; And a magnetic substance sheet for a wireless charging system.

Description

[0001] MAGNETIC SHEET FOR WIRELESS POWER CHARGER SYSTEM [0002]

The present invention relates to a magnetic sheet for a wireless charging system.

2. Description of the Related Art A non-contact type charging method, that is, a wireless charging method, which charges a battery using magnetic coupling without electrical contact, has been attracting attention as electronic appliances are made smaller and lighter in weight.

The wireless charging method is a method of charging by using electromagnetic induction. In this method, a primary coil (transmitting portion coil) is provided in a charger (wireless power transmitting device) and a secondary coil (receiving portion coil) is provided in a charging target (wireless power receiving device) And the power generated by inductive coupling between the primary coil and the secondary coil is converted into energy to charge the battery.

At this time, the magnetic substance sheet is disposed between the receiving coil and the battery. The magnetic substance sheet efficiently transmits the electromagnetic waves generated from the wireless power transmission device to the wireless power reception device to improve the charging efficiency.

In order to maximize the charging efficiency, the magnetic sheet has high magnetic saturation (Ms), μ 'value, and low core loss because the receiver coil is made of copper (Cu) And a loss of magnetic force.

Korean Patent Laid-Open Publication No. 2013-0072181

It is an object of the present invention to provide a magnetic sheet for a wireless charging system having high Ms and μ 'values and low core loss and magnetic loss.

One aspect of the present invention provides a magnetic sheet for a wireless charging system, wherein a plurality of core loss reducing members made of at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite is dispersed and contained in the adhesive layer.

According to one embodiment of the present invention, a plurality of core loss reducing members made of at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite are dispersed and included in the adhesive layer so that the magnetic sheet has a high MS and mu ' There is an effect of improving the charging efficiency by having core loss and magnetic loss.

1 is an external perspective view of a typical wireless charging system.
FIG. 2 is a cross-sectional view of the main internal structure of FIG. 1; FIG.
3 is a cross-sectional view showing a laminated structure of a magnetic sheet according to an embodiment of the present invention.
4 is a cross-sectional view showing a laminated structure of a magnetic sheet according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

The shape and size of elements in the drawings may be exaggerated for clarity.

In the drawings, like reference numerals are used to designate like elements that are functionally equivalent to the same reference numerals in the drawings.

In addition, to include an element throughout the specification does not exclude other elements unless specifically stated otherwise, but may include other elements.

FIG. 1 is an external perspective view of a general wireless charging system, and FIG. 2 is a cross-sectional view explaining a main internal configuration of FIG.

1 and 2, the wireless charging system may be comprised of a wireless power transmission device 10 and a wireless power receiving device 20 of an electronic device, such as a cellular phone, a notebook, and a tablet PC Or the like.

In the inside of the wireless power transmission apparatus 10, a transmission coil 11 is formed on a substrate 12, and a magnetic field is formed around the wireless power transmission apparatus 10 when an AC voltage is applied thereto. An electromotive force induced from the transmitter coil 11 is generated in the receiver coil 21 built in the wireless power receiving apparatus 20 and can be charged with the battery 22. [

The battery 22 may be a nickel-metal hydride battery or a lithium ion battery capable of charging and discharging, but the present invention is not limited thereto. The battery 22 may be configured separately from the wireless power receiving apparatus 20 so as to be removable from the wireless power receiving apparatus 20 or may be configured to be removable from the battery 22 and the wireless power receiving apparatus 20 And may be integrally formed as a single unit.

The transmitter coil 11 and the receiver coil 21 are electromagnetically coupled and can be formed by winding a metal wire such as copper. In this case, the winding shape may be a circle, an ellipse, a rectangle, a rhombus, or the like, and the overall size, number of turns, etc. may be appropriately controlled and set according to required characteristics.

The magnetic sheet of the present embodiment is disposed between the receiving coil and the battery, and can be efficiently received on the receiving coil side by focusing the magnetic flux. At the same time, the magnetic sheet can function to prevent at least part of the magnetic flux from reaching the battery. Hereinafter, the magnetic sheet will be described in more detail.

3 is a cross-sectional view showing a laminated structure of a magnetic sheet according to an embodiment of the present invention.

3, the magnetic sheet 100 of the present embodiment includes an electrode layer 110, a plurality of adhesive layers 120 and 140, and a plurality of magnetic layers 130 and 150. In this embodiment, the electrode layer 110, the first adhesive layer 120, the first magnetic layer 130, the second adhesive layer 140, and the second magnetic layer 150 are sequentially formed from the lower side As shown in FIG. However, the present invention is not limited thereto, and the magnetic layer and the adhesive layer may be composed of three or more layers, respectively, if necessary.

The electrode layer 110 is a portion connected to the surface of the receiver coil 21, and may be made of, for example, a ferrite sheet.

The first and second magnetic layers 130 and 150 may use a thin metal ribbon containing at least one of an amorphous alloy or a nanocrystalline alloy.

The amorphous alloy may be an Fe-based or a Co-based magnetic alloy. The Fe-based magnetic alloy may be Fe-Si-B alloy, for example.

The higher the content of Fe and other metals in the magnetic layer, the higher the saturation magnetic flux density. However, when the content of Fe element is excessive, it is difficult to form amorphous. For example, the content of Fe may be 70-90 atomic% And B is in the range of 10-30 atomic%, the amorphous forming ability of the alloy may be the most excellent.

Corrosive elements such as chromium (Cr) and cobalt (Co) can be added in an amount of 20 atomic% or less to prevent corrosion in the basic composition, and a small amount of other metal elements may be included as needed in order to impart other characteristics.

The nanocrystalline alloy may be an Fe-based nano-crystal magnetic alloy. For example, the Fe-based nano-crystal alloy may be Fe-Si-B-Cu-Nb alloy.

The first adhesive layer 120 serves to bond the electrode layer 110 and the first magnetic layer 130 to each other. For example, an acrylic adhesive may be used for the first adhesive layer 120, but the present invention is not limited thereto.

The first adhesive layer 120 includes a plurality of first core loss reducing members 161 scattered therein. The first core loss reducing member 161 serves to reduce hysteresis loss and reduce energy loss.

The first core loss reducing member 161 includes at least one of an amorphous material, a ferrite material, and a composite material of amorphous material and ferrite material. The first core loss reducing material 161 may include at least one of an amorphous material, The ferrite material and the composite material of the amorphous material and the ferrite material may be mixed with each other. When the first core loss reducing member 161 becomes a hybrid type, it is easy to manufacture the first core loss reducing member 161 so that a desired permeability and an energy loss rate are exhibited.

In addition, the first core loss reducing member 161 may be in the form of powder as an example. When the first core loss reducing member 161 is formed in the form of powder, the difference in magnetization degree due to the separation can be made larger by the oxide film formed on the surface of the powder, thereby increasing the μ 'value of the magnetic substance sheet 100, The loss can be further reduced.

In this case, when the first core loss reducing member 161 is in the form of a powder, 70 to 84.4 atomic% of iron (Fe), 7 to 15 atomic% of silicon (Si), 5 to 10 atomic% of boron (B) -5 atomic% or phosphorus (P) 3-5 atomic%. In addition, the first core loss reducing member may further include copper (Cu) at 1 atomic% or less when necessary. In the present embodiment, it is difficult to fabricate an amorphous first core loss reducing member having amorphous or nano-crystal grains having a desired μ 'value, core loss, and magnetic loss when the respective components are out of the threshold.

The first core loss reducing member 161 may be a flake shape as another example. In the case of the Fe-based first core loss reducing member 161, it is difficult to form a ribbon having a thickness of, for example, 4 to 6 cm in the sheet currently in use if it is difficult to produce a powder having an Fe content of 80% by weight or more and an Fe content is excessively large. Therefore, in this case, the ribbon is crushed to use a flake form.

The first core loss reducing member 161 may include Fe 80-87 atomic%, Si 4-7 atomic%, B 3-5 atomic%, Nb 3-5 atomic%, or P 3-5 atomic% when the first core loss reducing member 161 is flake form . In addition, the first core loss reducing member 161 may further include copper (Cu) at 1 atomic% or less when necessary. In the present embodiment, it is difficult to fabricate an amorphous first core loss reducing member having amorphous or nano-crystal grains having a desired μ 'value, core loss, and magnetic loss when the respective components are out of the threshold.

The second adhesive layer 140 serves to bond the first and second magnetic layers 130 and 150 to each other. For example, an acrylic adhesive may be used for the second adhesive layer 140, but the present invention is not limited thereto.

The second adhesive layer 140 includes a plurality of second core loss reducing members 162 scattered therein. The second core loss reducing member 162 serves to reduce hysteresis loss and reduce energy loss.

The second core loss reducing member 162 includes at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite.

On the other hand, the second core loss reducing member 162 may be formed of a mixture of an amorphous material, a ferrite material, and a composite material of amorphous material and ferrite material, if necessary.

In addition, the second core loss reducing member 162 may be in the form of a powder as an example. If the second core loss reducing member 162 is formed in the form of powder, the difference in magnetization degree due to the separation can be made larger by the oxide film formed on the powder surface, so that the value of μ 'of the magnetic substance sheet 100 can be increased and the core loss and magnetic force The loss can be further reduced.

In this case, when the second core loss reducing member 162 is in the form of powder, it may contain Fe 70-79.9 atomic%, Si 7-15 atomic%, B 5-10 atomic%, Nb 3-5 atomic% or P 3-5 atomic% have. In addition, the second core loss reducing member 162 may further include Cu at 1 atomic% or less if necessary. In this embodiment, it is difficult to fabricate an amorphous second core loss reducing member having amorphous or nano-crystal grains having μ 'value, core loss and magnetic loss loss desired by the user when each component is outside the corresponding threshold value.

The second core loss reducing member 162 may be a flake shape as another example. The second core loss reducing member 162 is difficult to form a powder having a Fe content of 80% by weight or more in the case of an Fe-based material and an excessively large amount of Fe in the case of a current-used ribbon of 4-6 cm in width. Therefore, in this case, the ribbon is crushed to use a flake form.

The second core loss reducing member 162 may include Fe 80-87 atomic%, Si 4-7 atomic%, B 3-5 atomic%, Nb 3-5 atomic%, or P 3-5 atomic% when the second core loss reducing member 162 is flake form . In addition, the second core loss reducing member 162 may further include Cu at 1 atomic% or less if necessary. In this embodiment, it is difficult to fabricate an amorphous second core loss reducing member having amorphous or nano-crystal grains having μ 'value, core loss and magnetic loss loss desired by the user when each component is outside the corresponding threshold value.

The first and second core loss reducing members 161 and 162 increase the Ms (Magnetic saturation) of the first and second adhesive layers 120 and 140, which act only as conventional dielectrics, the magnetic substance sheet 100 can be formed into a compact structure, the mu value of the magnetic substance sheet 100 can be increased, and the loss of core loss and magnetic force can be reduced to improve the wireless charging efficiency.

Further, if the μ 'and μ "values of the magnetic sheet 100 are appropriately controlled by the first and second core loss reducing members 161 and 162, the Q factor of the magnetic sheet 100 can be improved Accordingly, when the thickness of the magnetic substance sheet is the same, the magnetic permeability can be improved as compared with the conventional magnetic substance sheet (structure without the core loss reducing member).

On the other hand, the magnetic sheet 100 may be subjected to free annealing or annealing to densify the structure, thereby further increasing the Ms or mu 'value and further reducing the core loss and the magnetic loss.

At this time, a restriction may occur depending on the content of iron (Fe) contained in the magnetic substance sheet 100. For example, as the content of iron is increased or decreased, the capability of forming an amorphous ribbon, that is, the cooling rate limit, may be lowered, and it may become difficult to produce the magnetic sheet 100 with an area desired by a worker.

4 is a cross-sectional view showing a laminated structure of a magnetic sheet according to another embodiment of the present invention. Here, the same components as those of the first embodiment will not be described in detail in order to avoid redundancy.

Referring to FIG. 4, the magnetic sheet 200 of the present embodiment uses a thin metal ribbon having an amorphous alloy or a nanocrystalline amorphous alloy as the first and second magnetic layers 230 and 250 .

The first adhesive layer 220 serves to bond the electrode layer 210 and the first magnetic layer 230 to each other and the second adhesive layer 240 serves to bond the first and second magnetic layers 230 and 250 to each other do.

The first and second adhesive layers 220 and 240 include a plurality of first and second Ms complementary members 261 and 262 dispersed therein.

The first and second complementary members 261 and 262 may be formed of at least one of a hetero-amorphous material or a nanocrystalline-amorphous material and a hetero-amorphous material and a nanocrystal-amorphous material having high iron (Fe) .

The first and second Ms complementary members 261 and 262 may be laminated to be included in the first and second adhesive layers 220 and 240 after the heat treatment since the hetero-amorphous material has different heat- . In this embodiment, by using hetero, the coercive force of the first and second magnetic layers 230 and 250 can be controlled.

Further, the first and second Ms complementary members 261 and 262 may be in the form of powder as an example, and may be in the form of a flake as another example.

The first and second Ms complementary members 261 and 262 can make the magnetic substance sheet 200 compact in structure by supplementing the Ms value of the magnetic substance sheet 200, It is possible to further increase the charging efficiency by increasing the core loss and further reducing the magnetic loss and having an improved Q factor.

In addition, the magnetic sheet 200 can be manufactured to have an area desired by the operator by preventing the ability of the amorphous ribbon to be generated in the first and second magnetic layers 230 and 250, that is, the lowering of the cooling rate limit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various changes and modifications may be made therein without departing from the scope of the invention. It will be obvious to those of ordinary skill in the art.

10; Wireless power transmission device
11; Transmission coil
20; Wireless power receiving device
21; Receiving coil
22; battery
30; Electronics
100, 200; Magnetic sheet
110, 210; Electrode layer
120, 220; The first adhesive layer
130, 230; The first magnetic layer
140, 240; The second adhesive layer
150, 250; The second magnetic layer
161, 162; The first and second core loss reducing members
261, 262; The first and second Ms complementary members

Claims (10)

An electrode layer;
A plurality of magnetic layers disposed on the electrode layer; And
A plurality of core loss reduction members each being disposed between the electrode layer and the magnetic layer or between the magnetic layers and including at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite, A plurality of adhesive layers included; / RTI >
Wherein the core loss reducing member is in the form of a powder and is a wireless charging system comprising Fe 70-84.4 atomic%, Si 7-15 atomic%, B 5-10 atomic%, Nb 3-5 atomic% or P 3-5 atomic% Magnetic substance sheet.
The method according to claim 1,
Wherein the electrode layer is made of a ferrite sheet.
The method according to claim 1,
Wherein the magnetic layer comprises a thin metal ribbon containing at least one of an amorphous alloy or a nanocrystalline alloy.
delete delete An electrode layer;
A plurality of magnetic layers disposed on the electrode layer; And
A plurality of core loss reduction members each being disposed between the electrode layer and the magnetic layer or between the magnetic layers and including at least one of an amorphous material, a ferrite material, and a composite material of amorphous and ferrite, A plurality of adhesive layers included; / RTI >
Wherein the core loss reducing member is in a flake form.
The method according to claim 6,
Wherein the core loss reducing member comprises Fe 80-87 atomic%, Si 4-7 atomic%, B 3-5 atomic%, Nb 3-5 atomic% or P 3-5 atomic%.
An electrode layer;
A plurality of magnetic layers disposed on the electrode layer; And
A plurality of Ms complementary members disposed between the electrode layer and the magnetic or magnetic layers and each of which is formed of at least one of a hetero-amorphous material, a nanocrystal-amorphous material, and a hetero-amorphous material and a nanocrystalline amorphous material, A plurality of adhesive layers dispersed and contained; / RTI >
Wherein the Ms supplementary member is in a flake form.
9. The method of claim 8,
Wherein the Ms supplementary member is in the form of a powder.
delete
KR1020150121471A 2015-05-22 2015-08-28 Magnetic sheet for wireless power charger system KR101751119B1 (en)

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US15/065,384 US10020671B2 (en) 2015-05-22 2016-03-09 Magnetic sheet for wireless power charging system

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KR20150072154 2015-05-22
KR1020150072154 2015-05-22

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KR101751119B1 true KR101751119B1 (en) 2017-06-27

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101481042B1 (en) * 2013-09-09 2015-01-12 에스케이씨 주식회사 Magnetic sheet complex and preparation thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101481042B1 (en) * 2013-09-09 2015-01-12 에스케이씨 주식회사 Magnetic sheet complex and preparation thereof

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