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KR101994746B1 - Sheet for shielding electromagnetic wave and wireless power charging device - Google Patents

Sheet for shielding electromagnetic wave and wireless power charging device Download PDF

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Publication number
KR101994746B1
KR101994746B1 KR1020150105736A KR20150105736A KR101994746B1 KR 101994746 B1 KR101994746 B1 KR 101994746B1 KR 1020150105736 A KR1020150105736 A KR 1020150105736A KR 20150105736 A KR20150105736 A KR 20150105736A KR 101994746 B1 KR101994746 B1 KR 101994746B1
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KR
South Korea
Prior art keywords
magnetic layer
magnetic
electromagnetic wave
frequency band
shielding sheet
Prior art date
Application number
KR1020150105736A
Other languages
Korean (ko)
Other versions
KR20160137295A (en
Inventor
조중영
박두호
조성남
서정욱
정종호
오승희
Original Assignee
삼성전기주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to US15/057,766 priority Critical patent/US10028420B2/en
Priority to CN201610204284.5A priority patent/CN106170196B/en
Publication of KR20160137295A publication Critical patent/KR20160137295A/en
Application granted granted Critical
Publication of KR101994746B1 publication Critical patent/KR101994746B1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J7/025—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)

Abstract

According to an embodiment of the present invention, there is provided a magnetic sensor comprising: a first magnetic layer having a plurality of through holes penetrating in the thickness direction; a second magnetic layer filling the plurality of through holes and shielding a frequency band different from a frequency band of electromagnetic waves shielded by the first magnetic layer; An electromagnetic wave shielding sheet comprising a magnetic layer is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic wave shielding sheet and a wireless charging device,

The present invention relates to an electromagnetic wave shielding sheet and a wireless charging apparatus.

2. Description of the Related Art A non-contact type, that is, a wireless charging method that charges a battery using magnetic coupling without electrical contact has been attracting attention as electronic appliances become light in weight due to miniaturization and weight reduction of electronic appliances.

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 current generated by inductive coupling between the primary coil and the secondary coil is converted into energy to charge the battery.

At this time, an electromagnetic wave shielding sheet is disposed between the receiver coil and the battery. The shielding sheet shields the magnetic field generated from the receiving coil from reaching the battery and efficiently transmits the electromagnetic wave generated from the wireless power transmission device to the wireless power receiving device.

On the other hand, in the electromagnetic wave shielding sheet, an eddy current through which a spiral current flows may occur due to an electromotive force due to a change in magnetic flux inside the magnetic body. However, power loss occurs due to eddy current and the temperature of the magnetic body is raised. In addition, the magnetic field generated by this eddy current adversely affects the direction of the magnetic field generated by the transmitting portion, which may have a great influence on the reduction of the charging efficiency.

It is an object of the present invention to provide an electromagnetic wave shielding sheet and a wireless charging device that can be used for a plurality of wireless charging methods by performing a shielding function in different frequency bands.

Another object of the present invention is to provide an electromagnetic wave shielding sheet and a wireless charging device that can improve the heat generating characteristics and the charging efficiency by reducing the influence of the eddy current.

As a method for solving the above-mentioned problems, the present invention can provide a novel electromagnetic wave shielding sheet which can realize different wireless charging schemes through a single sheet and is advantageous in slimness, and further, Specifically, the electromagnetic wave shielding sheet is a structure including a first magnetic layer having a through hole and a second magnetic layer formed to fill the through hole.

In this case, the second magnetic layer shields the frequency band different from the frequency band of the electromagnetic wave shielded by the first magnetic layer, thereby realizing the above-described multiple wireless charging device. For example, the first magnetic layer may shield the frequency band of 100 to 300 KHz, and the second magnetic layer may shield the frequency band of 6 to 7 MHz. More specifically, the first magnetic layer may shield the electromagnetic wave shielding function And the second magnetic layer may perform a shielding function for a magnetic resonance method using a frequency of about 6.78 MHz.

In the case of the electromagnetic wave shielding sheet and the wireless charging apparatus proposed in one embodiment of the present invention, the electromagnetic wave shielding sheet and the wireless charging apparatus can be used for a plurality of wireless charging systems by performing the shielding function in different frequency bands.

Further, when the electromagnetic shielding sheet and the wireless charging device are used, the influence of the eddy current is reduced, so that the heat generating characteristic and the charging efficiency can be improved.

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.
Figs. 3 and 4 are a schematic plan view and a sectional view, respectively, of an electromagnetic wave shielding sheet according to an embodiment of the present invention.
5 to 7 are cross-sectional views schematically showing an electromagnetic wave shielding sheet according to another embodiment of the present invention.
8 and 9 are cross-sectional views schematically showing an electromagnetic wave shielding sheet according to still another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to specific embodiments and 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 for a more complete description of the present invention to the ordinary artisan. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements.

It is to be understood that, although the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be described using the symbols. Further, throughout the specification, when an element is referred to as "including" an element, it means that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

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

1 and 2, a typical wireless charging system may include an electronic device wireless power transmission device 10 and a wireless power receiving device 20, and the wireless power receiving device 20 may be a cellular phone, a notebook, And may be included in the electronic device 30 such as a PC.

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. Accordingly, an electromotive force derived from the transmitter coil 11 is generated in the receiver coil 21 built in the wireless power receiving apparatus 20, so that the battery 22 can be charged.

The battery 22 may be a nickel-metal hydride battery or a lithium ion battery capable of charging and discharging, but is not limited thereto. The battery 22 may be configured separately from the wireless power receiving apparatus 20 and may be configured to be detachable to or from the wireless power receiving apparatus 20 or the battery 22 and the wireless power receiving apparatus 20 Or may be integrally formed as one body.

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 can be circular, elliptical, quadrangular, rhombic, etc., and the overall size, number of turns, etc. can be appropriately controlled and set according to required characteristics.

The electromagnetic shielding sheet 100 may be disposed between the receiver coil 21 and the battery 22. The electromagnetic wave shielding sheet 100 is placed between the receiving coil 21 and the battery 22 and efficiently concentrates the magnetic flux so that the electromagnetic wave shielding sheet 100 can be received by the receiving coil 21 side. At the same time, the electromagnetic shielding sheet 100 functions to prevent at least a part of the magnetic flux from reaching the battery 22. Hereinafter, the electromagnetic wave shielding sheet 100 will be described in more detail.

Figs. 3 and 4 schematically show an electromagnetic wave shielding sheet according to an embodiment of the present invention, respectively, and correspond to a plan view and a sectional view, respectively. As shown in FIGS. 3 and 4, the first magnetic layer 100 has a plurality of through holes (not shown) penetrating in the thickness direction, and the first and second magnetic layers 101 and 102, And the second magnetic layer 102 fills the plurality of through holes. In this case, the frequency bands of the electromagnetic waves shielded by the first and second magnetic layers 101 and 102 are different from each other. Here, the different frequency band means that the main frequency domain for focusing and shielding is different, and does not mean that the frequencies of the focusing and shielding electromagnetic waves are completely different from each other.

Specifically, the first magnetic layer 101 shields the frequency band of 100 to 300 KHz, and the second magnetic layer 102 shields the frequency band of 6 to 7 MHz. More specifically, the first magnetic layer 101 may perform a shielding function for electromagnetic induction, and the second magnetic layer 102 may perform a shielding function for a magnetic resonance method using a frequency of approximately 6.78 MHz . As described above, since the magnetic shield sheet 100 proposed in the present embodiment can perform focusing and shielding functions for different frequency bands, different wireless charging schemes can be implemented in one sheet, Which is advantageous for the slimming of the thickness.

In order to perform the above-described function, the first magnetic layer 101 may be a thin metal ribbon made of an amorphous alloy, a nanocrystalline alloy, or the like. In this case, an Fe-based or Co-based magnetic alloy can be used as the amorphous alloy. The Fe-based magnetic alloy can use, for example, an Fe-Si-B alloy. The higher the content of Fe and other metals, the higher the saturation magnetic flux density. However, if the Fe content is excessive, Therefore, the content of Fe may be 70-90 atomic%, and when the sum of Si and B is in the range of 10-30 atomic%, the amorphous formability of the alloy is the most excellent. In order to prevent corrosion in such a basic composition, corrosion resistance elements such as Cr and Co may be added in an amount of 20 atomic% or less, and a small amount of other metal elements may be added as needed to impart different properties.

Next, when using a nanocrystalline alloy, for example, an Fe-based nano-crystal magnetic alloy can be used. The Fe-based nano-crystal alloy can be Fe-Si-B-Cu-Nb alloy.

The second magnetic layer 102 may be formed of a soft magnetic material and may be formed of, for example, a Mn-Zn based, Mn-Ni based, Ba, or Sr ferrite material. Further, .

Meanwhile, a method of forming the through-hole in the first magnetic layer 101 may be a process known in the art. For example, a metal ribbon may be mechanically processed to form a through-hole. In this embodiment, a sheet capable of functioning in two frequency bands is proposed. However, the present invention is not limited thereto, and three or more magnetic layers may be used depending on the required frequency band.

By having the above-described structure, the electromagnetic wave shielding sheet 100 can reduce the influence of the eddy current as well as the shielding function in a plurality of frequency bands. In the process of wireless charging or the like, a swirl-like eddy current may be generated inside the electromagnetic wave shielding sheet 100 due to an electromotive force due to a change in magnetic flux. In the present embodiment, the second magnetic layer 102 is formed of a material having a higher specific resistance than the first magnetic layer 101, that is, a material having low electrical conductivity, in order to reduce the influence of the eddy current described above. This form can also be obtained when the above-described materials are employed (for example, when metal ribbon is used for the first magnetic layer and ferrite is used for the second magnetic layer). In this case, eddy currents generated in the first magnetic layer 101 can be reduced as the second magnetic layer 102 having a relatively low electrical conductivity is arranged inside. In order to further improve the eddy current reducing function, the second magnetic layer 102 may be formed of an electrically insulating material.

Meanwhile, in order to perform the above-described functions, the second magnetic layer 102 may be arranged in the first magnetic layer 101 in a regular pattern shape as shown in FIG. 3, Zigzag shape or the like. Also, the second magnetic layer 102 may be arranged in the first magnetic layer 101 in an irregular form. In this case as well, functions such as focusing and blocking of electromagnetic waves and eddy current reduction can be exhibited.

The electromagnetic shielding sheet 100 may have a plurality of stacked layers, not a single layer. In this case, the number of stacked layers can be appropriately adjusted depending on the intended shielding function, the size of the electronic device, and the like. 5 and 7, the electromagnetic shielding sheets 200, 300, and 400 proposed in these embodiments include a plurality of first magnetic layers 101 (two in FIGS. 5 and 7, And each of the first magnetic layers 101 can be coupled to each other by the adhesive layer 103 as shown in Figs. 5 and 6, for example. Alternatively, as in the example of Fig. 7, the first magnetic layer 101 may be bonded without depending on the adhesive layer. In the case of not using the adhesive layer, the second magnetic layer 102 is filled in the first magnetic layer 101 in paste or uncured state, and then pressure, heat or the like is applied to obtain the above-described laminated structure.

Further, when a structure in which a plurality of the first magnetic layers 101 are stacked, the position of the second magnetic layer 102 can be adjusted in consideration of the electromagnetic wave shielding function. 5 to 7, the second magnetic layer 102 is disposed at a position staggered from the other second magnetic layer 102 disposed at the upper portion or the lower portion of the plurality of first magnetic layers 101. In other words, So that more efficient electromagnetic wave shielding can be realized by this arrangement method.

An electromagnetic wave shielding sheet according to another embodiment of the present invention will be described with reference to Figs. 8 and 9. Fig. In the embodiment of FIG. 8, the first magnetic layer 101 'is a structure that is broken into a plurality of pieces of chain, and the eddy current of the first magnetic layer 101' can be further reduced by such flaking treatment. In addition to the first magnetic layer 101 ', as in the embodiment of FIG. 9, the second magnetic layer 102' may also be broken up into a plurality of broken pieces as necessary.

The present invention is not limited to the above-described embodiments and the accompanying drawings, but is intended to be limited only by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

10: Wireless power transmission device
11: Transmission coil
20: Wireless power receiving device
21: Receiver coil
22: Battery
30: Electronic device
100: electromagnetic wave shielding sheet
101, 101 ': first magnetic layer
102, 102 < 2 >: second magnetic layer
103: Adhesive layer

Claims (16)

A first magnetic layer in the form of a metal ribbon having a plurality of through holes penetrating in the thickness direction and arranged in a lattice form in rows and columns; And
A second magnetic layer filling the plurality of through holes and shielding a frequency band higher than a frequency band of an electromagnetic wave shielded by the first magnetic layer;
And an electromagnetic shielding sheet.
The method according to claim 1,
Wherein the first magnetic layer shields the frequency band of 100 to 300 KHz.
The method according to claim 1,
Wherein the first magnetic layer performs a shielding function for the electromagnetic induction method.
The method according to claim 1,
And the second magnetic layer shields a frequency band of 6 to 7 MHz.
The method according to claim 1,
Wherein the second magnetic layer performs a shielding function for a magnetic resonance method.
delete The method according to claim 1,
Wherein the second magnetic layer is made of a material having a higher resistivity than the first magnetic layer.
The method according to claim 1,
Wherein the second magnetic layer is made of a soft magnetic material.
The method according to claim 1,
Wherein the second magnetic layer is made of an electrically insulating material.
delete The method according to claim 1,
Wherein the electromagnetic wave shielding sheet has a laminated structure in which a plurality of the first magnetic layers are provided.
12. The method of claim 11,
Wherein the plurality of first magnetic layers are bonded to each other by an adhesive layer.
12. The method of claim 11,
Wherein the plurality of first magnetic layers are directly bonded to each other without depending on the adhesive layer.
12. The method of claim 11,
Wherein the second magnetic layer is disposed at a position staggered with another second magnetic layer disposed at an upper portion or a lower portion of the plurality of first magnetic layers.
The method according to claim 1,
Wherein the first magnetic layer has a structure in which the first magnetic layer is broken into a plurality of pieces of chain.
Nose; And
A first magnetic layer disposed adjacent to the coil portion and having a plurality of through holes arranged in a lattice pattern in a form of metal ribbon and penetrating in a thickness direction and formed in rows and columns, and a second magnetic layer filling the plurality of through holes, An electromagnetic wave shielding sheet comprising a second magnetic layer that shields a frequency band higher than a frequency band of electromagnetic waves shielded by the magnetic layer;
And the wireless charging device.
KR1020150105736A 2015-05-22 2015-07-27 Sheet for shielding electromagnetic wave and wireless power charging device KR101994746B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/057,766 US10028420B2 (en) 2015-05-22 2016-03-01 Sheet for shielding against electromagnetic waves and wireless power charging device
CN201610204284.5A CN106170196B (en) 2015-05-22 2016-04-01 Sheet for shielding electromagnetic wave and wireless charging device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150072174 2015-05-22
KR20150072174 2015-05-22

Publications (2)

Publication Number Publication Date
KR20160137295A KR20160137295A (en) 2016-11-30
KR101994746B1 true KR101994746B1 (en) 2019-07-01

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Publication number Priority date Publication date Assignee Title
KR101866118B1 (en) * 2017-01-23 2018-06-08 한국과학기술원 Electromagnetic shielding film for aircraft canopy and manufacturing method thereof

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KR101534542B1 (en) * 2012-11-21 2015-07-07 동부전자소재 주식회사 A hybrid magnetic sheet for wireless power charging and near field communication and a hybrid module comprising the same
KR101489391B1 (en) * 2013-03-04 2015-02-03 엘지이노텍 주식회사 Soft magnetism sheet
KR101813301B1 (en) * 2013-10-14 2017-12-28 삼성전기주식회사 Magnetic sheet, wireless charging module and method for manufacturing magnetic sheet
KR101548277B1 (en) * 2015-04-28 2015-08-28 주식회사 아모센스 Antenna Device for Wireless Charging and NFC

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