KR20140117882A - Soft magnetism sheet, wireless power receiving apparatus and wireless charging method of the same - Google Patents

Abstract

A wireless power receiving apparatus according to an embodiment of the present invention comprises a substrate; a soft magnetism layer stacked on the substrate, made of a soft magnetism material, and including a hole; a sheet-shaped magnet stacked on the substrate, and arranged inside the hole to focus an electromagnetic field generated from a permanent magnet of the wireless power receiving apparatus; a receiving antenna stacked on the soft magnetism layer and receiving electromagnetic energy emitted from the wireless power receiving apparatus; and a circuit unit connected to the receiving antenna and converting the electromagnetic energy into electric energy.

Description

TECHNICAL FIELD [0001] The present invention relates to a soft magnetic sheet, a wireless power receiving device, and a wireless charging method therefor. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft magnetic sheet, a wireless power receiving apparatus and a wireless charging method thereof, and more particularly to a structure of a soft magnetic sheet for an antenna included in a wireless power receiving apparatus.

Background Art [0002] With the development of wireless communication technology, there is a growing interest in wireless power transmission / reception technology for wirelessly supplying electric power to electronic devices. Such wireless power transmission / reception technology can be applied not only to battery charging of a portable terminal, but also to power supply for household electric appliances, power supply to electric vehicles and subways.

Typical wireless power transmission and reception techniques utilize the principles of magnetic induction or self-resonance. For example, when electrical energy is applied to a transmission antenna of a wireless power transmission device, the transmission antenna can convert electrical energy into electromagnetic energy and radiate it to the surroundings. The receiving antenna of the wireless power receiving apparatus can receive the electromagnetic energy radiated from the transmitting antenna and convert it into electric energy.

At this time, in order to increase the power transmission / reception efficiency, it is necessary to minimize the energy loss between the wireless power transmission apparatus and the wireless power reception apparatus. To this end, it is necessary to align the transmitting and receiving antennas within the effective distance. In addition, it is necessary to dispose the soft magnetic material around the transmitting antenna and the receiving antenna so that the electromagnetic energy radiated from the transmitting antenna is focused in the direction of the receiving antenna.

Such a soft magnetic material for the receiving antenna may vary depending on the frequency range and the principle (for example, magnetic induction, self resonance).

Generally, the soft magnetic material for the receiving antenna includes at least one of a soft magnetic material (e.g., at least one of Fe-Si-Al, Fe-Si-Cr, and Fe-Si-B, Composite) or a ferrite material is used.

On the other hand, in order to align the transmitting antenna with the receiving antenna, the wireless power transmitting device may include a permanent magnet. When a wireless power receiving device (e.g., a smart phone) is placed on a wireless power transmitting device (e.g., a transmitting pad) for wireless charging, the wireless power receiving device is moved by the force of the permanent magnet included in the wireless power transmitting device So that the transmission antenna and the reception antenna can be calibrated to the optimum position.

However, such a permanent magnet does not greatly affect the soft magnetic material for the transmission antenna having a relatively large thickness, but it can lower the magnetic permeability of the soft magnetic material for the reception antenna. This is because the soft magnetic material having a small thickness has a high magnetic permeability in the planar direction, so that the magnetization value of the soft magnetic material for the receiving antenna can be saturated by the magnetic field generated from the permanent magnet. As a result, the electromagnetic energy from the transmitting antenna leaks, and the transmission efficiency between the transmitting antenna and the receiving antenna is lowered.

Accordingly, a technique of obtaining a soft magnetic material having a high saturation magnetization by using a metal material has been proposed. However, even when such a soft magnetic material is used, a low power receiving efficiency is obtained as compared with the case of using a wireless power transmitting apparatus not including a permanent magnet.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a soft magnetic sheet for a receiving antenna for improving wireless power receiving efficiency of a wireless power receiving apparatus.

A wireless power receiving apparatus for wirelessly charging electric power according to an embodiment of the present invention includes a substrate, a soft magnetic layer stacked on the substrate and made of a soft magnetic material and including a hole, A sheet-like magnet stacked on the soft magnetic layer and configured to concentrate a magnetic field generated from the permanent magnet of the wireless power transmission device, disposed in the hole, a laminated layer stacked on the soft magnetic layer, for receiving electromagnetic energy radiated from the wireless power transmission device An antenna, and a circuit unit connected to the reception antenna and converting the electromagnetic energy into electric energy.

The sheet-like magnet may be a cross-section multipolar magnet.

The sheet-like magnet may be an up-and-down magnet.

The reception antenna comprises a coil surface wound on the soft magnetic layer in a direction parallel to the soft magnetic layer, and the hole may be formed inside the coil surface.

The thickness of the sheet-shaped magnet may be equal to or greater than the thickness of the soft magnetic layer, and may be equal to or less than the total thickness of the soft magnetic layer and the coil surface.

At least one shielding line may be formed around the hole.

And a near field communication (NFC) antenna stacked on the soft magnetic layer and surrounding the receiving antenna.

The perimeter of the hole and the magnet in the form of a sheet can be spaced apart.

A wireless charging method of a wireless power receiving apparatus according to an embodiment of the present invention uses a magnet in the form of a sheet disposed inside a hole formed in a soft magnetic sheet of the wireless power receiving apparatus Collecting the electromagnetic energy radiated from the transmission coil of the wireless power transmission device, converting the collected electromagnetic energy to electrical energy, and charging using the converted electrical energy.

A soft magnetic sheet of a wireless power receiving apparatus according to an embodiment of the present invention includes a soft magnetic layer made of a soft magnetic material and including a hole, a magnet in the form of a sheet disposed inside the hole, And a receiving antenna for receiving electromagnetic energy radiated from the wireless power transmission device.

According to the embodiment of the present invention, the electromagnetic energy focusing performance of the receiving antenna can be enhanced in the wireless power receiving apparatus, and the power transmission efficiency can be maximized. In addition, it is possible to obtain a desired electromagnetic energy focusing effect even in a thin thickness, and thus it can be applied to a variety of electronic devices (eg, TV, portable terminal, notebook, and tablet PC) having a slim trend.

Further, since the electromagnetic energy focusing performance is excellent and the material cost is low, it can be applied to large-sized applications such as electric vehicles, subways, and electric trains.

Further, even if the wireless power transmission apparatus includes a permanent magnet, the influence of the permanent magnet can be absorbed, and high power transmission efficiency can be obtained. It is also compatible with the case where the wireless power transmission device does not include a permanent magnet.

Further, it is applicable to soft magnetic sheets of all materials, and the manufacturing process is simple, and there is no increase in thickness.

1 is a block diagram illustrating a wireless power transceiver system in accordance with an embodiment of the present invention.
FIG. 2 is a diagram showing a part of a wireless power transmission apparatus, and FIG. 3 is a diagram showing a part of a wireless power reception apparatus.
FIG. 4 is a top view of a general soft magnetic layer, and FIG. 5 shows a wireless power transmission / reception system including the soft magnetic layer of FIG.
FIG. 6 is a top view of a soft magnetic layer according to an embodiment of the present invention, and FIGS. 7 to 8 show a wireless power transmission / reception system including the soft magnetic layer of FIG.
9 is a top view of a soft magnetic layer according to another embodiment of the present invention.
10 is a flowchart illustrating a wireless charging method of a wireless power receiving apparatus according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a block diagram illustrating a wireless power transceiver system in accordance with an embodiment of the present invention.

Referring to FIG. 1, a wireless power transmission / reception system includes a wireless power transmission apparatus 100 and a wireless power reception apparatus 200. The wireless power transmission apparatus 100 applies electrical energy to a transmission antenna, and the transmission antenna converts electrical energy into electromagnetic energy and radiates it to the surroundings. The wireless power receiving apparatus 200 receives electromagnetic energy radiated from a transmitting antenna using a receiving antenna and converts the received electromagnetic energy into electric energy to charge the antenna.

Here, the wireless power transmission apparatus 100 is, for example, a transmission pad. The wireless power receiving apparatus 200 may be a portable terminal to which wireless power transmission / reception technology is applied, a household / personal electronic product, a transportation means, and the like. A mobile terminal to which the wireless power transmission / reception technology is applied, a household / personal electronic product, a transportation means, etc. may include only the wireless power receiving apparatus 200 or may include both the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 Can be set.

Meanwhile, the wireless power receiving apparatus 200 may be configured to include a module having both a wireless power conversion (WPC) function and a near field communication (NFC) function. At this time, the wireless power receiving apparatus 200 may perform short-range wireless communication with the external apparatus 300 including the NFC module.

FIG. 2 is a diagram showing a part of a wireless power transmission apparatus, and FIG. 3 is a diagram showing a part of a wireless power reception apparatus.

2, the wireless power transmission apparatus 100 includes a transmission circuit (not shown), a soft magnetic core 110, a transmission antenna 120, and a permanent magnet 130.

The soft magnetic core 110 may be made of a soft magnetic material having a thickness of several mm. The transmission antenna 120 may be a transmission coil, and the permanent magnet 130 may be surrounded by a transmission antenna 120.

Referring to FIG. 3, the wireless power transmission apparatus 200 includes a reception circuit (not shown), a soft magnetic layer 210, and a reception antenna 220. The soft magnetic layer 210 may be laminated on a substrate (not shown). The substrate may be composed of multiple layers of fixed sheets and may be bonded to the soft magnetic layer 210 to fix the soft magnetic layer 210.

The soft magnetic layer 210 concentrates the electromagnetic energy radiated from the transmitting antenna 120 of the wireless power transmission apparatus 100.

The soft magnetic layer 210 may be formed of a metal material or a ferrite material and the soft magnetic layer 210 may be formed in various forms such as a sintered body (pellet), a plate, a ribbon, a foil, . ≪ / RTI > For example, the soft magnetic layer 210 may be in the form of a composite comprising a single metal or alloy powder flake containing at least one of Fe, Co, Ni and a polymeric resin. Alternatively, the soft magnetic layer 210 may be an alloy ribbon or a laminated ribbon including at least one of Fe, Co, and Ni. Or the soft magnetic layer 210 may be a foil or a film comprising at least one of Fe, Co, and Ni.

A reception antenna 220 is stacked on the soft magnetic layer 210. The receiving antenna 220 may be a coiled surface wound in a direction parallel to the soft magnetic layer 210 on the soft magnetic layer 210. For example, a receiving antenna applied to a smart phone may be in the form of a spiral coil having an outer diameter of 50 mm or less and an inner diameter of 20 mm or more. Although not shown, a heat dissipation layer may be further included between the soft magnetic layer 210 and the reception antenna 220. In this specification, the soft magnetic layer 210 and the receiving antenna 220 may be referred to as a soft magnetic sheet. The soft magnetic sheet may mean not only a flexible structure but also a rigid structure such as a sintered body, a plate and the like.

When the wireless power receiving apparatus 200 has the WPC function and the NFC function at the same time, the NFC coil 230 may be further stacked on the soft magnetic layer 210. The NFC coil 230 may be formed to surround the outside of the receiving antenna 220.

Each of the reception antenna 220 and the NFC coil 230 may be electrically connected to each other through a terminal 240.

Equation (1) represents the magnetic inductance coupling coefficient.

Where Lx is the self inductance of the receiving antenna, L _Tx is the self inductance of the transmitting antenna, and M is the inductance of the transmitting antenna and the receiving antenna, where k is the inductive coupling coefficient, L _Rx is the self- (mutual inductance).

In the case where the wireless power transmission apparatus includes a permanent magnet and the distance between the transmission antenna and the reception antenna is 5 mm and the thickness of the soft magnetic layer in which the reception antenna is stacked is 0.2 mm, And has a value of 0.75 to 0.8. In other words, it is common to obtain a transmission efficiency of 6-70% considering the loss of conduction and the loss of circuit.

FIG. 4 is a top view of a general soft magnetic layer, and FIG. 5 shows a wireless power transmission / reception system including the soft magnetic layer of FIG.

4 and 5, when the wireless power transmission apparatus 100 includes the permanent magnet 130, the soft magnetic layer 210 is saturated by the magnetic field generated by the permanent magnet 130. Accordingly, the electromagnetic energy transmitted from the transmitting antenna 120 can not be sufficiently focused on the receiving antenna 220, resulting in a low power transmission efficiency.

In the embodiment of the present invention, the structure of the soft magnetic layer in which the reception antennas are stacked is changed to enhance the efficiency of wireless power transmission / reception. That is, the magnetic field generated by the permanent magnet of the wireless power transmission apparatus is blocked or changed to prevent magnetic saturation of the soft magnetic layer.

FIG. 6 is a top view of a soft magnetic layer according to an embodiment of the present invention, and FIGS. 7 to 8 show a wireless power transmission / reception system including the soft magnetic layer of FIG.

6 to 8, the soft magnetic layer 210 includes a hole 600. The hole 600 may be formed at a position opposite to the permanent magnet 130 included in the wireless power transmission apparatus 100 (e.g., inside the coil surface forming the receiving antenna 220). The size of the hole 600 may be 0.5 to 1.5 times the size of the permanent magnet 130. For example, when the diameter of the permanent magnet 130 is 12 mm, the longest distance of the hole 230 may be 6 mm to 18 mm.

Inside the hole 600, a sheet-like magnet 610 is disposed. At this time, the peripheries of the sheet-like magnets 610 and the holes 600 may be separated by a predetermined distance. Accordingly, the magnetic field generated by the permanent magnet 130 is focused on the magnet 610 in the form of a sheet, and the gap between the magnet 610 in the form of a sheet and the periphery of the hole 600 causes the plane of the soft magnetic layer 210 The magnetic field transmitted in the direction of the magnetic field can be minimized. When the magnetization value of the soft magnetic layer 210 is low, the focusing performance of the receiving antenna 220 is increased, so that the power transmission efficiency is increased.

On the other hand, the sheet-like magnet 610 may be magnetized up and down as shown in Fig. 7, or may be multipolar magnetized as shown in Fig. A sheet-like magnet 610 which is vertically magnetized or cross-poles magnetized passes through a magnetic field from the permanent magnet 130 and flows to the upper portion of the soft magnetic layer 210. However, a part of the magnetic field can be transmitted from the edge of the magnet 610 which is magnetized up and down in the plane direction of the soft magnetic layer 210. Therefore, the sheet-shaped magnet having a cross-section multipolar magnetization, as compared with the magnet of the sheet-shaped upper and lower magnetizations, can further lower the magnetization value of the soft magnetic layer 210.

The sheet-like magnet may be at least one of NdFeB rubber material, anisotropic ferrite material and isotropic ferrite material.

The thickness of the sheet-shaped magnet may be equal to or greater than the thickness of the soft magnetic layer 210, and may be equal to or less than the total thickness of the soft magnetic layer 210 and the coil surface. Accordingly, even if a sheet-like magnet is disposed in the hole, the overall thickness is not increased.

Here, the soft magnetic layer 210 is shown as being rectangular, but it is not limited thereto. The soft magnetic layer 210 may have various shapes such as a circle, an ellipse, and a polygon. Although the hole 600 and the magnet 610 in the form of a sheet are shown as being rectangular, the present invention is not limited thereto and may be formed in various shapes such as a circle, an ellipse, and a polygon. The number of holes formed in the soft magnetic layer 210 may be one or more.

9 is a top view of a soft magnetic layer according to another embodiment of the present invention.

Referring to FIG. 9, the soft magnetic layer 210 includes an isolation line 620 formed outside the hole 600. The shield line 620 may be a notch formed by cutting lines or etching formed by a punch or cutting process. The blocking line 620 may be in the form of a solid line or a broken line.

The shield line 620 formed outside the hole 600 may block the magnetic field transmitted in the planar direction of the soft magnetic layer 210. Accordingly, not only the magnetic field transmitted from the edge of the vertically magnetized sheet-like magnet 610 but also the transmission of the magnetic field absorbed into the soft magnetic layer 210 after passing through the sheet-shaped magnet 610 can be blocked.

Table 1 shows the experimental results of the power transmission efficiency of the soft magnetic layer of the metal material. For the experiment, a composite material (thickness: 0.2 mm, permeability: 50) containing 90 wt% or more of FeSiCr flake was used as the soft magnetic layer. The thickness of the coil surface constituting the reception antenna was 0.1 mm, and a double-sided adhesive sheet of 40 to 50 탆 was used for adhesion between the coil surface and the soft magnetic layer. The size of the hole formed in the soft magnetic layer was 20 x 10 mm ² , the size of the sheet magnet was 13 x 5.6 mm ² , and the thickness was 0.3 mm. Nd ₂ Fe ₁₄ B rubber magnet (8MGOe), M-type Ba hexaferrite isotropic rubber magnet (1MGOe), and M-type Sr hexaferrite anisotropic rubber magnet (1.5MGOe) were used as the sheet magnet. When the sheet magnet was subjected to multipolar magnetization in the cross section, the N pole and the S pole cross at a distance of 2 mm in the longitudinal direction of the receiving antenna.

Presence or absence of permanent magnet on transmission side Presence or absence of the reception side soft magnetic layer Presence or absence of sheet magnet inside the hole Sheet magnet material Transmission power efficiency
(%) × - - - 62.2 ○ × - - 57.9 ○ ○ - - 59.8 ○ ○ ○ (up and down) NdFeB rubber magnet 59.9 ○ ○ ○ (up and down) Anisotropic ferrite magnets 59.8 ○ ○ ○ (up and down) Isotropic ferrite magnets 59.7 ○ ○ ○ (cross-section multipolar magnetization) NdFeB rubber magnet 60.5 ○ ○ ○ (cross-section multipolar magnetization) Anisotropic ferrite magnets 60.3 ○ ○ ○ (cross-section multipolar magnetization) Isotropic ferrite magnets 59.9

As shown in Table 1, when the wireless power transmission apparatus does not include a permanent magnet, the transmission power efficiency is 62%, but when the permanent magnet is included, the transmission power efficiency is reduced to 57.9%. At this time, if a hole is formed in the soft magnetic layer of the wireless power receiving apparatus, the transmission power efficiency increases to 59.8%, and if the sheet magnet is disposed in the hole, the transmission power efficiency is further increased. Particularly, when a sheet magnet of cross-section multipole magnet made of NdFeB material was disposed, the transmission power efficiency increased to 60.5%. It can be seen that the magnetic saturation prevention effect (2.6% / 4.3%) is about 60% as compared with the difference of the transmission power efficiency (62.2% -57.9% = 4.3%) depending on whether the wireless power transmission apparatus includes permanent magnets have.

Table 2 shows the experimental results of the power transmission efficiency of the ferromagnetic soft magnetic layer. For the experiment, a half slit ferrite sheet (thickness: 0.2 mm, permeability: 130) was used. The RF power transmitter used in the experiment included a permanent magnet with a diameter of 12 mm and a Ni-Zn ferrite was used as the soft magnetic layer of the wireless power transmission device. The thickness of the coil surface constituting the reception antenna was 0.1 mm, and a double-sided adhesive sheet of 40 to 50 탆 was used for adhesion between the coil surface and the soft magnetic layer. The size of the hole formed in the soft magnetic layer was 20 x 10 mm ² , the size of the sheet magnet was 13 x 5.6 mm ² , and the thickness was 0.3 mm. Nd ₂ Fe ₁₄ B rubber magnet (8MGOe), M-type Ba hexaferrite isotropic rubber magnet (1MGOe), and M-type Sr hexaferrite anisotropic rubber magnet (1.5MGOe) were used as the sheet magnet. A cross-section multipolar magnet was used in which the N and S poles intersect each other at intervals of 2 mm in the longitudinal direction of the antenna with a sheet magnet.

Presence or absence of permanent magnet on transmission side Presence or absence of the reception side soft magnetic layer Presence or absence of sheet magnet inside the hole Sheet magnet material Transmission power efficiency
(%) × - - - 66.2 ○ × - - 53.4 ○ ○ - - 57.8 ○ ○ ○ (cross-section multipolar magnetization) NdFeB rubber magnet 59.5 ○ ○ ○ (cross-section multipolar magnetization) Anisotropic ferrite magnets 57.3 ○ ○ ○ (cross-section multipolar magnetization) Isotropic ferrite magnets 57.4

As shown in Table 2, when the wireless power transmission apparatus does not include a permanent magnet, the transmission power efficiency is 66.2%, but when the permanent magnet is included, the transmission power efficiency is reduced to 53.4%. At this time, if a hole is formed in the soft magnetic layer of the wireless power receiving apparatus, the transmission power efficiency increases to 57.8%, and if the sheet magnet is disposed in the hole, the transmission power efficiency is further increased. Particularly, when a sheet magnet of a cross-section multipole magnet made of NdFeB was disposed, the transmission power efficiency increased to 59.5%. It can be seen that the magnetic saturation prevention effect (6.1% / 12.8%) is about 48% as compared with the difference of the transmission power efficiency (66.2% -53.4% = 12.8%) according to whether the wireless power transmission apparatus includes permanent magnets have.

Since the ferrite material has a saturation magnetization lower than half that of the metal material, it is strongly influenced by the permanent magnet included in the wireless power transmission device. Therefore, when the ferrite material is used as the soft magnetic layer of the wireless power receiving apparatus, the power transmission efficiency may differ by 20% or more depending on whether the wireless power transmission apparatus includes the permanent magnet. Accordingly, when a ferrite material is used as the soft magnetic layer, the effect on the hole and the sheet magnet may be greater than when the metal material is used. Particularly, the ferrite material has excellent NFC characteristics. Therefore, a hole can be formed in the soft magnetic layer of the ferrite material to obtain a wireless power receiving device that satisfies both the NFC efficiency and the WPC efficiency. (Transmission power efficiency = 59.5%) is superior to the soft magnetic layer (transmission power efficiency = 57.9%) of the metal material when the NdFeB rubber magnet is disposed in the hole formed in the ferrite soft magnetic layer, It can be understood that the present invention can be applied to a structure including both NFC function and WPC function.

It is possible to perform wireless charging using a wireless power receiving apparatus including a soft magnetic layer according to an embodiment of the present invention.

10 is a flowchart illustrating a wireless charging method of a wireless power receiving apparatus according to an embodiment of the present invention.

10, the wireless power receiving apparatus 200 focuses the magnetic field, which is generated from the permanent magnet 130 of the wireless power transmission apparatus 100, into a magnet in the form of a sheet disposed in a hole formed in the soft magnetic layer 210 S1000). Next, the receiving antenna 220 of the wireless power receiving apparatus 200 collects the electromagnetic energy radiated from the transmitting antenna 120 of the wireless power transmitting apparatus 100 (S1010). The receiving circuit of the wireless power receiving apparatus 200 converts the electromagnetic energy collected by the receiving antenna 220 into electrical energy (S1020), and charges the electrical energy using the converted electrical energy (S1030).

By concentrating the magnetic field generated from the permanent magnet in the sheet magnet disposed in the hole formed in the soft magnetic layer of the wireless power receiving apparatus, the magnetic field is prevented from being transmitted through the planar direction of the soft magnetic layer and the magnetic saturation of the soft magnetic layer is prevented can do. Thus, the power transmission efficiency from the transmitting antenna to the receiving antenna can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

200: Wireless power receiving device
210: soft magnetic layer
220: receiving antenna
600: hole
610: magnet in sheet form
620: Break line

Claims (8)

1. A wireless power receiving apparatus for wirelessly charging power, comprising:
Board,
A soft magnetic layer laminated on the substrate and made of a soft magnetic material and including a hole,
A sheet-like magnet stacked on the substrate and arranged inside the hole to concentrate a magnetic field coming from the permanent magnet of the wireless power transmission device,
A receiving antenna that is stacked on the soft magnetic layer and receives electromagnetic energy radiated from the wireless power transmission device,
A circuit unit connected to the reception antenna and converting the electromagnetic energy into electric energy;
And the wireless power receiving device. The method according to claim 1,
Wherein the sheet-like magnet is a magnet having a cross-section multipolar magnetization. The method according to claim 1,
Wherein the sheet-like magnet is an up-and-down magnet. The method according to claim 1,
And at least one shielding line is formed around the hole. The method according to claim 1,
And a near field communication (NFC) antenna stacked on the soft magnetic layer and surrounding the receiving antenna. The method according to claim 1,
And the periphery of the hole is spaced apart from the magnet in the sheet form. A wireless charging method for a wireless power receiving apparatus,
Comprising the steps of concentrating a magnetic field from a permanent magnet of a wireless power transmission apparatus using a sheet-like magnet disposed inside a hole formed in the soft magnetic sheet of the wireless power receiving apparatus,
Collecting electromagnetic energy radiated from a transmit coil of the wireless power transmission apparatus,
Converting the collected electromagnetic energy into electric energy, and
A step of charging using the converted electric energy
Lt; / RTI > In a soft magnetic sheet of a wireless power receiving apparatus,
A soft magnetic layer made of a soft magnetic material and including a hole,
A magnet in the form of a sheet disposed inside the hole, and
A receiving antenna disposed on the soft magnetic layer for receiving electromagnetic energy radiated from the wireless power transmission device,
And the soft magnetic sheet.

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