KR102359780B1 - Shielding unit for a wireless power transmission module and a wireless power transmission module having the same - Google Patents

Abstract

A shielding unit for a wireless power transmission module and a wireless power transmission module having the same are provided. A shielding unit for a wireless power transmission module according to an exemplary embodiment of the present invention includes: a magnetic field shielding sheet that shields a magnetic field generated in a predetermined frequency band and focuses it in a required direction; a plate-shaped support member having an adhesive layer formed on at least one surface thereof so as to be attached to one surface of the magnetic field shielding sheet; a magnetic body accommodating part penetratingly formed in the magnetic field shielding sheet; a magnetic material disposed in the magnetic material accommodating portion and formed as a cut piece separated from the magnetic field shielding sheet into a size relatively smaller than that of the magnetic material receiving portion so as to induce a magnetic force line generated from the permanent magnet; and a gap formed between the side surfaces of the magnetic material facing each other and the inner surface of the magnetic material receiving part, and formed entirely along the circumferential direction of the magnetic material; the magnetic field shielding sheet includes at least one of an amorphous alloy and a nano-crystalline alloy made of a ribbon sheet, wherein the magnetic body accommodating part and the magnetic body punch the magnetic field shielding sheet by an area corresponding to the magnetic body to form the magnetic body accommodating part, and the punched part is formed at the same time by using the magnetic body, The magnetic field shielding sheet and the magnetic material have the same thickness and material, and when the punching is completed, the magnetic material is inserted into the magnetic material receiving portion with the gap, and the magnetic material is inserted into the magnetic material receiving portion When one surface is attached to the support member to maintain the gap spaced apart from the inner surface of the magnetic body accommodating part by a predetermined distance, the center point of the magnetic body is located directly above the center point of the permanent magnet, corresponding to the permanent magnet The magnetic body accommodating part is formed to have a size larger than that of the permanent magnet so that the magnetic field shielding sheet is not disposed in the region directly above the area, and the gap completely blocks direct contact between the magnetic field shielding sheet and the magnetic body in the permanent magnet Prevents the magnetic field shielding sheet from being magnetized by the generated direct current magnetic field, the width of the gap is 10㎛ to 1mm, the same as the thickness of the blade or mold used for punching.

Description

Shielding unit for a wireless power transmission module and a wireless power transmission module having the same

The present invention relates to wireless charging of a portable terminal, and more particularly, to a shielding unit for a wireless power transmission module applied to a wireless power transmission method employing a permanent magnet, and a wireless power transmission module having the same.

The portable terminal is equipped with a wireless charging function for wirelessly charging a built-in battery. Such wireless charging is performed by a wireless power receiving module built into the portable terminal and a wireless power transmitting module supplying power to the wireless power receiving module. made by

In addition, wireless charging is sometimes classified into a magnetic induction method and a magnetic resonance method, and the magnetic induction method is also classified into a PMA method and a Qi method according to a method of detecting the approach of the wireless power receiving module to the wireless power transmitting module.

Among them, the PMA wireless charging method controls the operation of the wireless power transmission module by detecting the approach of the wireless power reception module using a permanent magnet and a Hall sensor, and the concept thereof is schematically illustrated in FIG. 1 .

As shown in Fig. 1, the wireless power transmission module 10 has a permanent magnet 14 and a Hall sensor 12 installed, and the wireless power reception module 20 has a magnetic material ( 22) is attached.

Accordingly, when the wireless power receiving module 20 approaches the wireless power transmitting module 10, the path of the magnetic force line generated from the permanent magnet 14 is changed by the magnetic body 22, and the voltage at the hall sensor 12 A difference occurs in the value, and when the difference in the voltage value exceeds a certain level, it is recognized that the wireless power receiving module 20 has approached, and the wireless power transmitting module 10 is operated to perform wireless charging.

At this time, since the magnetic body 22 is attached to one surface of the shielding sheet 24, the magnetic force line generated from the permanent magnet is induced to the magnetic body 22 and then is blocked by the shielding sheet 24 and cannot pass to the outside. flow along the sheet 24 (see FIG. 1 arrow).

Accordingly, when the wireless power transmitting module and the wireless power receiving module are close to each other, the magnetic field shielding sheet partially or entirely including the magnetic material is magnetized by the DC magnetic field, thereby reducing the performance as a shielding sheet or performing a function as a shielding sheet can't do it

In particular, as shown in FIG. 1 , in the region A of the magnetic field shielding sheet close to the magnetic material, magnetization by the DC magnetic field generated by the permanent magnet frequently occurs.

For this reason, in the case of an antenna disposed at a position corresponding to the region A magnetized by the DC magnetic field, there is a problem in that the performance is deteriorated or the normal operation is impossible, so that the transmission efficiency is lowered.

On the other hand, among the Qi methods, there is a method in which a permanent magnet is employed in the wireless power transmission module to align the wireless power transmission module and the wireless power reception module. That is, a permanent magnet is installed in the wireless power transmitting module, and a magnetic material is attached to the approximately central portion of the shielding sheet to the wireless power receiving module. Through this, when the wireless power receiving module is brought close to the wireless power transmitting module, the permanent magnet and the magnetic body are aligned with each other through the DC magnetic field generated from the permanent magnet, thereby aligning the wireless power transmitting module and the wireless power receiving module.

In this method, as in the above-described PMA method, part or all of the shielding sheet is magnetized by the DC magnetic field generated from the permanent magnet, so that the performance as the shielding sheet is deteriorated or the function as the shielding sheet is not performed, so it is magnetized by the DC magnetic field. In the case of an antenna disposed in a position corresponding to the designated area, there is a problem in that the performance is deteriorated or the normal operation is impossible, so that the transmission efficiency is lowered.

KR 10-1188808 B

The present invention has been devised in view of the above points, and the magnetic material for inducing the DC magnetic field generated from the permanent magnet is disposed so as not to contact the magnetic field shielding sheet or by minimizing the contact area so that the DC magnetic field generated from the permanent magnet is An object of the present invention is to provide a shielding unit for a wireless power transmission module capable of increasing the transmission efficiency of an antenna by reducing movement to the magnetic shielding sheet side, and a wireless power transmission module including the same.

In addition, the present invention provides a shielding unit for a wireless power transmission module that can achieve thinness while stably satisfying or realizing the conditions and characteristics required for a wireless charging method by receiving a part or the entire thickness of a magnetic material in a magnetic field shielding sheet, and a shielding unit including the same Another object is to provide a wireless power transmission module.

In order to achieve the above object, the present invention provides a magnetic field shielding sheet for focusing in a desired direction as well as shielding a magnetic field generated in a predetermined frequency band; a plate-shaped support member having an adhesive layer formed on at least one surface thereof so as to be attached to one surface of the magnetic field shielding sheet; a magnetic body accommodating part penetratingly formed in the magnetic field shielding sheet; a magnetic material disposed in the magnetic material accommodating portion and formed as a cut piece separated from the magnetic field shielding sheet into a size relatively smaller than that of the magnetic material receiving portion so as to induce a magnetic force line generated from the permanent magnet; and a gap formed between the side surfaces of the magnetic material facing each other and the inner surface of the magnetic material receiving part, and formed entirely along the circumferential direction of the magnetic material; the magnetic field shielding sheet includes at least one of an amorphous alloy and a nano-crystalline alloy made of a ribbon sheet, wherein the magnetic body accommodating part and the magnetic body punch the magnetic field shielding sheet by an area corresponding to the magnetic body to form the magnetic body accommodating part, and the punched part is formed at the same time by using the magnetic body, The magnetic field shielding sheet and the magnetic material have the same thickness and material, and when the punching is completed, the magnetic material is inserted into the magnetic material receiving portion with the gap, and the magnetic material is inserted into the magnetic material receiving portion When one surface is attached to the support member to maintain the gap spaced apart from the inner surface of the magnetic body accommodating part by a predetermined distance, the center point of the magnetic body is located directly above the center point of the permanent magnet, corresponding to the permanent magnet The magnetic body accommodating part is formed to have a size larger than that of the permanent magnet so that the magnetic field shielding sheet is not disposed in the region directly above the area, and the gap completely blocks direct contact between the magnetic field shielding sheet and the magnetic body in the permanent magnet Prevents the magnetic field shielding sheet from being magnetized by the generated DC magnetic field, the width of the gap is 10㎛ to 1mm, and the same thickness as the blade or mold used for punching Provides a shielding unit for a wireless power transmission module .

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In addition, the support member may be a heat dissipation sheet or an adhesive member having an adhesive layer formed on at least one surface thereof.

In addition, the support member may be a thin metal sheet made of a metal material, and the metal sheet may include at least one pattern through which the metal sheet is formed.

In this case, the pattern may include any one of a slit having a predetermined width and length and a through hole having a predetermined area.

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On the other hand, the present invention is at least one antenna operating in a predetermined frequency band; a magnetic field shielding sheet that shields the magnetic field generated by the radio signal induced in the antenna and focuses it in a required direction; a plate-shaped support member having an adhesive layer formed on at least one surface thereof so as to be attached to one surface of the magnetic field shielding sheet; a magnetic body accommodating part penetratingly formed in the magnetic field shielding sheet; a magnetic material disposed in the magnetic material accommodating portion and formed as a cut piece separated from the magnetic field shielding sheet into a size relatively smaller than that of the magnetic material receiving portion so as to induce a magnetic force line generated from the permanent magnet; and a gap formed between the side surfaces of the magnetic material facing each other and the inner surface of the magnetic material receiving part, and formed entirely along the circumferential direction of the magnetic material; the magnetic field shielding sheet includes at least one of an amorphous alloy and a nano-crystalline alloy made of a ribbon sheet, wherein the magnetic body accommodating part and the magnetic body punch the magnetic field shielding sheet by an area corresponding to the magnetic body to form the magnetic body accommodating part, and the punched part is formed at the same time by using the magnetic body, The magnetic field shielding sheet and the magnetic material have the same thickness and material, and when the punching is completed, the magnetic material is inserted into the magnetic material receiving portion with the gap, and the magnetic material is inserted into the magnetic material receiving portion When one surface is attached to the support member to maintain the gap spaced apart from the inner surface of the magnetic body accommodating part by a predetermined distance, the center point of the magnetic body is located directly above the center point of the permanent magnet, corresponding to the permanent magnet The magnetic body accommodating part is formed to have a size larger than that of the permanent magnet so that the magnetic field shielding sheet is not disposed in the region directly above the area, and the gap completely blocks direct contact between the magnetic field shielding sheet and the magnetic body in the permanent magnet Prevents the magnetic field shielding sheet from being magnetized by the generated DC magnetic field, the width of the gap is 10㎛ to 1mm, and provides a wireless power transmission module equal to the thickness of the blade or mold used for punching.

In addition, the antenna unit may be of a combo type including at least two antennas among an antenna for wireless power transmission, an MST antenna, and an NFC antenna.

On the other hand, the present invention provides a portable terminal capable of wireless charging, in which the wireless power transmission module as described above is installed on the rear case or back cover of the portable terminal body and operates as a wireless power reception module.

According to the present invention, by reducing the amount of the DC magnetic field flowing into the magnetic shielding sheet by inducing and emitting the DC magnetic field generated from the permanent magnet to the outside, the magnetization of the magnetic shielding sheet can be prevented and charging efficiency can be increased.

In addition, since a part or the entire thickness of the magnetic material can be accommodated in the magnetic shielding sheet, a magnetic material of sufficient thickness can be used without increasing the overall thickness of the wireless power transmission module, so that the wireless power transmission module, especially the wireless power receiving module, is thin. Even if it is designed as a wireless charging method, it can satisfy all the conditions and characteristics required by the wireless charging method, enabling stable and efficient application to light, thin, compact, and portable terminals.

1 is a schematic diagram showing a movement path of a DC magnetic field generated from a permanent magnet in a wireless charging type charging system including a permanent magnet;
2 is a view schematically showing a shielding unit for a wireless power transmission module according to an embodiment of the present invention, and a wireless power transmission module having the same;
3 is a cross-sectional view schematically showing a wireless power transmission module according to an embodiment of the present invention;
4 is a diagram schematically showing a wireless power transmission module according to an embodiment of the present invention, and is a cross-sectional view showing a case in which a magnetic material and a magnetic field shielding sheet are made of the same material;
5 is a view schematically showing a shielding unit for a wireless power transmission module according to another embodiment of the present invention, and a wireless power transmission module having the same;
6 is a cross-sectional view schematically showing a wireless power transmission module according to another embodiment of the present invention;
7A to 7D are views showing various patterns formed on the metal sheet of FIG. 5;
8 is a schematic diagram showing a state in which a magnetic field generated from a permanent magnet is induced by a magnetic material in a wireless charging method charging system employing a wireless power transmission module according to an embodiment of the present invention to prevent saturation of the shielding sheet, and;
9 is a schematic diagram showing a state in which a wireless power transmission module according to an embodiment of the present invention is embedded in a portable terminal.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

2 and 5, the wireless power transmission module 100, 200 according to an embodiment of the present invention includes at least one antenna 111, 112, 113, a shielding unit 120 and a magnetic body 130, and the like.

Here, as shown in FIG. 9, the wireless power transmission modules 100 and 200 are embedded in a mobile terminal 90 such as a smart phone and electrically connected to a battery to receive wireless power supplied from the wireless power transmission module 10, It may be a wireless power receiving module for charging the battery. In this case, the wireless power transmission modules 100 and 200 may be built into the main body of the mobile terminal 90 or may be provided in a form attached to one surface of the back cover 92 or the rear case 94 , It may be integrated with the back cover 92 or the rear case 94 .

The antennas 111, 112 and 113 transmit or receive wireless signals to or from portable electronic devices such as mobile phones, PDA's, PMPs, tablets, and multimedia devices in a predetermined frequency band to perform predetermined functions.

These antennas 111, 112, and 113 may be composed of a circular, oval, or rectangular flat coil wound in a clockwise or counterclockwise direction, but the present invention is not limited thereto, and as shown in FIG. 2 , polyimide (PI) or A conductor such as copper foil may be patterned on at least one surface of the circuit board 114 made of a synthetic resin such as PET, or may be formed into a loop-shaped metal pattern using conductive ink.

Hereinafter, for convenience of description, it will be described that the antennas 111 , 112 , and 113 are patterned in a loop shape on the circuit board 114 .

At this time, the antenna includes an antenna 111 for wireless power transfer that serves as a receiving coil (Rx coil) for receiving a wireless power signal, and an antenna performing other functions may be configured together. can

That is, the antenna may be configured only with the antenna 111 for wireless power transmission, and in addition to the antenna 111 for wireless power transmission, the antenna 112 for MST for Magnetic Secure Transmission and short-range wireless communication (Near) Field Communication) for NFC) may be configured in a combo type further including at least any one of the antenna 113.

The shielding unit 120 is disposed on one surface of the antennas 111, 112, and 113 to shield the magnetic field generated by the radio signal induced in the antennas 111, 112, and 113 and to focus the magnetic field in a required direction.

To this end, the shielding unit 120 includes a magnetic field shielding sheet 122 and a magnetic body accommodating part 124 .

The magnetic field shielding sheet 122 is made of a plate-shaped member having a predetermined area, and is made of a material having magnetism to shield the magnetic field and focus it in a desired direction.

Such a magnetic field shielding sheet 122 may be made of a variety of known materials. For example, the magnetic field shielding sheet 122 may be a ribbon sheet, a ferrite sheet, or a polymer sheet including at least one of an amorphous alloy and a nano-crystalline alloy.

Here, the amorphous alloy may be a Fe-based or Co-based magnetic alloy may be used, and the ferrite sheet may be formed of a sintered ferrite sheet such as Mn-Zn ferrite or Ni-Zn ferrite.

In addition, the magnetic field shielding sheet 122 may be flake-treated to be formed separately in plurality, and may have a multi-layered structure.

In addition, when the magnetic field shielding sheet 122 is provided with a plurality of antennas 111 , 112 , and 113 performing different roles, a shielding sheet made of different materials may be used to improve the performance of the corresponding antenna, and the different kinds of shielding may be used. The sheets may be configured in a laminated form or may be configured in a frame type in which one is accommodated inside the other.

Since such a magnetic field shielding sheet 122 is a known configuration, a detailed description thereof will be omitted, and as the material used for the shielding sheet, all commonly used known materials may be used.

On the other hand, in the shielding unit 120 according to the present invention, the magnetic body receiving part 124 for accommodating the magnetic body 130 is formed through the magnetic field shielding sheet 122 .

Here, the magnetic body 130 is a magnetic force line generated from the permanent magnet of the wireless power transmission module 10 when the wireless power transmission module 100 , 200 approaches the wireless power transmission module 10 including the permanent magnet 14 . By changing the path of , it can serve as an attractor for inducing a change in the voltage value in the hall sensor 12 that satisfies the operation start condition of the wireless power transmission module 10 .

In addition, the magnetic body 130 is an alignment means for aligning the wireless power receiving module and the wireless power transmitting module through interaction with a permanent magnet provided in the wireless power transmitting module when the wireless power receiving module and the wireless power transmitting module are in proximity. It can also play a role as

Such a magnetic body 130 is inserted and disposed in the magnetic body accommodating part 124, and is provided in the wireless power transmission module when aligned with the wireless power transmission module so that the magnetic flux path can be changed by inducing the magnetic field lines generated from the permanent magnet. It may be disposed at a position corresponding to the permanent magnet.

For example, the magnetic material 130 may be disposed at a position corresponding to the central space of the antenna, and may have the same thickness as the magnetic field shielding sheet 122 or relatively thicker than the magnetic field shielding sheet 122 . It may have a thickness.

In addition, the magnetic body 130 is made of a material having magnetism to induce a DC magnetic field generated from the permanent magnet. For example, the magnetic material 130 may be a thin ribbon sheet including at least one of silicon steel (FeSi), an amorphous alloy, and a nanocrystalline alloy, and may be made of ferrite, permalloy, or a polymer.

In addition, the magnetic material 130 may be composed of a single layer of an amorphous ribbon sheet, two or more layers of amorphous ribbon sheet may be stacked in multiple layers, and may be flake-treated and formed separately into a plurality of pieces.

At this time, the magnetic body accommodating part 124 is formed to have a relatively larger size than the magnetic body 130 accommodated therein, and the magnetic body 130 faces each other while being inserted into the magnetic body accommodating part 124. A predetermined gap 126 may be formed between the side surface of the magnetic body 130 and the inner surface of the magnetic body accommodating part 124 .

Here, the gap 126 formed between the side surface of the magnetic body 130 facing each other and the magnetic body accommodating part 124 may be formed entirely or partially along the circumferential direction of the magnetic body 130 .

For example, in the magnetic body 130 provided to have a relatively smaller size than the magnetic body accommodating part 124 , all sides facing the inner surface of the magnetic body accommodating part 124 are directly connected to the inner surface of the magnetic body accommodating part 124 . It may be disposed not to be in contact, and some of the side surfaces facing the inner surface of the magnetic material accommodating part 124 may be in contact with the inner surface of the magnetic material accommodating part 124 and the other side surfaces may not be in contact.

In other words, in the magnetic body 130 inserted and disposed in the magnetic body accommodating part 124, at least a portion of the entire side facing the inner surface of the magnetic body accommodating part 124 is not in direct contact with the inner surface of the magnetic body accommodating part 124. placed so as not to

In addition, when the gap 126 formed between the side of the magnetic body 130 facing each other and the magnetic body accommodating part 124 is formed entirely along the circumferential direction of the magnetic body 130, the gap 126 is 10 μm ~ It can be 5 mm.

Accordingly, the magnetic material 130 is physically separated from the magnetic field shielding sheet 122 and completely blocks direct contact with the magnetic field shielding sheet 122 or minimizes the contact area, and the side surface of the magnetic material 130 is Except for the upper surface and the lower surface, the magnetic field shielding sheet 122 is not disposed.

Through this, the wireless power transmission module 100, 200 according to the present invention such that the magnetic body 130 is placed in a position close to the vertical upper portion or the vertical upper portion of the permanent magnet 14. When approaching the wireless power transmission module 10 side The DC magnetic field generated by the permanent magnet 14 is emitted to the outside after the path of the magnetic flux is induced toward the magnetic body 130 . In addition, even if the DC magnetic field generated from the permanent magnet is directly introduced to the magnetic field shielding sheet, the amount of the incoming magnetic flux can be reduced or minimized.

For this reason, it is possible to prevent the magnetic field shielding sheet 122 in the area around the magnetic material 130 from being magnetized by the DC magnetic field generated by the permanent magnet.

This is because the magnetic body 130 is physically separated from the magnetic field shielding sheet 122 and completely blocks direct contact with each other through the gap 126 or minimizes the contact area, thereby induced DC magnetic field toward the magnetic body 130 . This is because it is possible to block or minimize the movement in the lateral direction of the magnetic material 130 to directly move toward the magnetic field shielding sheet 122 .

In other words, unlike the prior art in which some areas close to the magnetic material were magnetized by the DC magnetic field generated by the permanent magnet and the performance as a shielding sheet was deteriorated, in the present invention, performance similar to the desired shielding performance can be exhibited even in an area close to the magnetic material. Therefore, it is possible to obtain the desired transmission efficiency by preventing the deterioration of the performance of the antenna located close to the magnetic material.

Meanwhile, the magnetic body accommodating part 124 and the magnetic body 130 according to the present invention may be made of the same material and may be provided to have the same thickness as each other (see FIG. 4 ). For example, the magnetic body accommodating part 124 and the magnetic body 130 punch a magnetic field shielding sheet having a predetermined area by an area corresponding to the magnetic body 130 to configure the magnetic body accommodating part 124 and cut the punched part It can also be used as the magnetic body 130 .

Accordingly, since the material is not lost by using the part punched out by the punching process as the magnetic body 130, it is possible to achieve cost reduction.

In addition, when the magnetic body accommodating part 124 and the magnetic body 130 are simultaneously formed through the punching process, between the magnetic body 130 and the magnetic body accommodating part 124, the knife blade or the mold is used for punching. A gap corresponding to the thickness may also be formed at the same time.

In addition, when the punching is completed, the magnetic material 130 is inserted into the magnetic material accommodating part 124 with a predetermined gap without the need to perform any special operation, so the magnetic material 130 is inserted into the magnetic material receiving part 124 No additional work is required to do this.

As a specific example of this, a magnetic field shielding sheet made of a ribbon sheet containing at least one of an amorphous alloy and a nanocrystalline alloy is punched out by a predetermined area to form a magnetic body receiving part, and the punched part is used to induce a magnetic force line generated from a permanent magnet. By using a magnetic material for the above, the magnetic field shielding sheet and the magnetic material may have the same material and the same thickness.

Meanwhile, the magnetic body accommodating part 124 may be formed to have a relatively larger size than the permanent magnet 14 provided in the wireless power transmission module 10 . For example, the magnetic body accommodating part 124 may be provided to have a relatively larger cross-sectional area than that of the permanent magnet 14 .

This corresponds to the permanent magnet 14 when the wireless power transmission modules 100 and 200 and the wireless power transmission module 10 are disposed so that the central point of the magnetic body 130 is located directly above the central point of the permanent magnet 14 . This is to prevent the magnetic field shielding sheet 122 from being disposed in the area directly above the area. Through this, the magnetic body 130 or the gap 126 formed between the magnetic body 130 and the magnetic body accommodating part 124 is disposed on the side directly above the permanent magnet 14, so that the DC magnetic field generated by the permanent magnet 14 is disposed. Since it is possible to minimize or prevent direct induction of the magnetic field shielding sheet 122, it is possible to prevent deterioration of the antenna performance and to increase the transmission efficiency.

This can be confirmed in Table 1 below.

That is, the comparative example is the charging efficiency when a magnetic material is attached to one surface of the shielding sheet in the same way as in the conventional method, and in Example 1, the magnetic material receiving part 124 is formed to have a diameter of 19 mm, and the inner surface of the magnetic material receiving part and the side of the magnetic body The charging efficiency is when the interval between them is 1 mm, and in Example 2, the magnetic body accommodating part 124 is formed to have a diameter of 17 mm and the spacing between the inner surface of the magnetic body accommodating part and the side of the magnetic body is 1 mm.

Here, in the case of Comparative Examples, Examples 1 and 2, except for the size and presence or absence of the magnetic body accommodating part, the antenna for wireless power transmission and the magnetic field shielding sheet were measured under the same conditions.

magnetic body role electric current Charging efficiency when a magnetic material is attached to one side of the shielding sheet
(Comparative example) Charging efficiency when a magnetic material is placed in a magnetic material receiving part with a diameter of 19mm
(Example 1) Charging efficiency when a magnetic material is placed in a magnetic material receiving part with a diameter of 17 mm
(Example 2) for positioning
500mA 63.6% 67.5% 65.8% 600mA 65.6% 69.0% 67.9% 700mA 66.9% 70.2% 68.9% 800mA 67.8% 70.5% 69.3% 900mA 67.8% 71.1% 70.0% 1000mA 68.1% 71.3% 70.5% attractor 500mA 53.7% 55.9% 57.7% 600mA 55.3% 57.3% 58.9% 700mA 56.3% 58.2% 60.1% 800mA 57.3% 59.1% 61.0% 900mA 58.2% 59.9% 61.9% 1000mA 58.7% 60.4% 62.5%

As can be seen in Table 1 above, when a current of 1A used for conventional wireless charging is applied, in the case of Examples 1 and 2, the charging efficiency of 60% or more required by the wireless charging method regardless of the role of the magnetic material are all satisfied with However, in the case of the comparative example, it can be seen that the charging efficiency does not satisfy 60% when used as an attractor, and the charging efficiency is lower than that of Examples 1 and 2 even when used for position alignment. On the other hand, in the wireless power transmission module 100 and 200 according to the present invention, the magnetic material 130 is inserted into the magnetic material receiving part 124 that is formed through the magnetic field shielding sheet 122 to accommodate a part or the entire thickness of the magnetic material 130 . As a result, even if the magnetic body 130 is included in the wireless power transmission module 100,200, the wireless power transmission module 100,200 can be implemented in a thin form, and even if the overall thickness of the wireless power transmission module 100,200 is thinned, the magnetic body 130 having a sufficient thickness. ) can be used.

In other words, even if the overall thickness of the wireless power transmission module 100, 200 is limited, the thickness of the required wireless power transmission module is satisfied by accommodating at least a portion of the thickness of the magnetic body 130 through the magnetic body accommodating part 124. However, it is possible to stably satisfy or implement all the conditions and characteristics required for the wireless charging method.

The shielding unit 120 according to the present invention may include separate support members 140 and 240 on one surface of the magnetic field shielding sheet 122 .

In this case, the support members 140 and 240 are formed of a plate-shaped member, and are provided to have a relatively larger area than the magnetic body accommodating part 124 so as to completely cover the magnetic body accommodating part 124 . Here, the support members 140 and 240 may be provided to have the same area as the magnetic field shielding sheet 122 , or may be provided to have a relatively narrower cross-sectional area than the magnetic field shielding sheet 122 .

Accordingly, the magnetic body 130 has one surface attached to the support members 140 and 240 in the state inserted into the magnetic body accommodating part 124, thereby forming a gap 126 spaced apart from the inner surface of the magnetic body accommodating part 124 by a predetermined distance. be able to keep

At this time, the support member 140 may be a heat dissipation sheet for dissipating heat generated from a heat source to the outside, may be an adhesive member having an adhesive layer formed on at least one surface, and to protect the magnetic field shielding sheet 122 from the external environment. It may be a protective film for

For example, the support member 140 may be a heat dissipation sheet made of a material such as graphite having excellent thermal conductivity, may be a known double-sided tape or single-sided tape, and may be a fluororesin-based protective film such as PET.

In addition, the support member 240 may be a thin metal sheet attached to the magnetic field shielding sheet 122 via an adhesive layer on one surface as shown in FIGS. 5 and 6 . That is, since the support member 240 is implemented as a thin metal sheet made of a metal material having thermal conductivity, a heat dissipation function of dissipating heat transferred from a heat source to the outside as well as a protective function of protecting the magnetic field shielding sheet 122 may be performed simultaneously.

For example, the metal sheet may be formed of a metal thin plate having a thermal conductivity of 200 W/m·K or more, and may be an aluminum foil or a copper foil.

In this case, when the support member 240 is provided as a thin metal sheet, the support member 240 may include at least one pattern 142 and 144 that is formed through the support member (see FIGS. 7A to 7D ). Such patterns 142 and 144 increase the overall resistance of the support member 240, thereby suppressing the generation of eddy currents during wireless charging using wireless power, thereby increasing charging efficiency.

Such patterns 142 and 144 may be provided in whole or in part on the metal sheet, may be formed to have a constant pattern, or may be formed in a random shape.

In addition, the pattern may be provided in the form of a slit 142 having a predetermined length, may be provided in the form of a through hole 144 , or in a form in which the slit 142 and the through hole 144 are mixed. may be provided.

Here, the slit may be provided in the form of a cutout extending inwardly by a predetermined length from the edge of the metal sheet, or may be provided in the form of a through hole penetrating the inside of the metal sheet, in a form in which the cutout and the through hole are combined. may be provided as

The above-described wireless power transmission modules 100 and 200 according to an embodiment of the present invention may be installed inside the rear case 94 or the back cover 92 of the portable terminal 90 as shown in FIG. 9 .

In addition, as shown in FIG. 8, the wireless power transmission modules 100 and 200 according to an embodiment of the present invention are wireless charging method charging including a wireless power transmission module 10 and a wireless power reception module employing a permanent magnet. It can be applied to the system (1).

For example, the wireless power transmission modules 100 and 200 according to the present invention may be a wireless power reception module in the wireless charging method charging system 1 employing a permanent magnet.

The wireless power transmission module 10 operates when the wireless power reception module approaches and wirelessly supplies power to the wireless power reception module, and the wireless power reception module uses the power supplied as described above to power the built-in battery of the portable terminal. recharge

In FIG. 8, reference numeral 14 denotes a hall sensor and a permanent magnet constituting a device for detecting the approach of a wireless power receiving module, and reference numeral 16 denotes a wireless power transmission antenna for transmission.

Here, the Hall sensor may be omitted when the wireless charging method charging system 1 employing the permanent magnet operates in the Qi method. In addition, when the wireless charging method charging system 1 employing the permanent magnet operates in the Qi method, the permanent magnet aligns the wireless power transmission module and the wireless power reception module through interaction with the magnetic body 130 . Used for sorting.

Meanwhile, the wireless power transmission modules 100 and 200 according to the present invention have been exemplified as being applied to the PMA method and the Qi method in which a permanent magnet is employed in the wireless power transmission module, but are not limited thereto, and a permanent magnet is employed in the wireless power transmission module. It should be noted that it can be applied to other wireless charging methods if it is in the form of

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

100,200: wireless power transmission module 111: wireless power transmission antenna
112: antenna for MST 113: antenna for NFC
114: circuit board 120: shielding unit
122: magnetic shielding sheet 124: magnetic body receiving part
126: gap 130: magnetic material
140,240: support member 142,144: pattern

Claims (18)

A magnetic field shielding sheet that shields the magnetic field generated in a predetermined frequency band and focuses it in a required direction;
a plate-shaped support member having an adhesive layer formed on at least one surface thereof so as to be attached to one surface of the magnetic field shielding sheet;
a magnetic body accommodating part penetratingly formed in the magnetic field shielding sheet;
a magnetic material disposed in the magnetic material accommodating portion and formed as a cut piece separated from the magnetic field shielding sheet into a size relatively smaller than that of the magnetic material receiving portion so as to induce a magnetic force line generated from the permanent magnet; and
A gap is formed between the side surfaces of the magnetic body facing each other and the inner surface of the magnetic body accommodating part, and is formed as a whole along the circumferential direction of the magnetic body;
The magnetic field shielding sheet is made of a ribbon sheet comprising at least one of an amorphous alloy and a nano-crystalline alloy,
The magnetic body accommodating part and the magnetic body are formed at the same time by punching the magnetic field shielding sheet by an area corresponding to the magnetic body to form the magnetic body receiving part, and the punched part is formed at the same time by using the magnetic body, the magnetic field shielding sheet and the magnetic body It has the same thickness and material, and when the punching is completed, the magnetic material is placed in the magnetic material receiving portion with the gap in the inserted state,
One side of the magnetic body is attached to the support member in a state of being inserted into the magnetic body accommodating part, thereby maintaining the gap spaced apart from the inner surface of the magnetic body accommodating part by a predetermined distance,
When the center point of the magnetic material is located directly above the center point of the permanent magnet, the magnetic material receiving portion has a size larger than that of the permanent magnet so that the magnetic field shielding sheet is not disposed in an area directly above the area corresponding to the permanent magnet. is formed,
The gap completely blocks direct contact between the magnetic field shielding sheet and the magnetic material to prevent the magnetic field shielding sheet from being magnetized by the DC magnetic field generated from the permanent magnet,
The width of the gap is 10㎛ to 1mm, the shielding unit for the wireless power transmission module equal to the thickness of the blade or mold used for punching. delete The method of claim 1,
The support member is a heat dissipation sheet or an adhesive member having an adhesive layer formed on at least one surface thereof, a shielding unit for a wireless power transmission module. The method of claim 1,
The support member is a shielding unit for a wireless power transmission module which is a thin metal sheet made of a metal material. 5. The method of claim 4,
The metal sheet is a shielding unit for a wireless power transmission module including at least one pattern that is formed through. 6. The method of claim 5,
The pattern is a shielding unit for a wireless power transmission module comprising at least one of a slit having a predetermined width and length and a through hole having a predetermined area. delete delete at least one antenna operating in a predetermined frequency band;
a magnetic field shielding sheet that shields the magnetic field generated by the radio signal induced in the antenna and focuses it in a required direction;
a plate-shaped support member having an adhesive layer formed on at least one surface thereof so as to be attached to one surface of the magnetic field shielding sheet;
a magnetic body accommodating part penetratingly formed in the magnetic field shielding sheet;
a magnetic material disposed in the magnetic material accommodating portion and formed as a cut piece separated from the magnetic field shielding sheet into a size relatively smaller than that of the magnetic material receiving portion so as to induce a magnetic force line generated from the permanent magnet; and
A gap is formed between the side surfaces of the magnetic body facing each other and the inner surface of the magnetic body accommodating part, and is formed as a whole along the circumferential direction of the magnetic body;
The magnetic field shielding sheet is made of a ribbon sheet comprising at least one of an amorphous alloy and a nano-crystalline alloy,
The magnetic body accommodating part and the magnetic body are formed at the same time by punching the magnetic field shielding sheet by an area corresponding to the magnetic body to form the magnetic body receiving part, and the punched part is formed at the same time by using the magnetic body, the magnetic field shielding sheet and the magnetic body It has the same thickness and material, and when the punching is completed, the magnetic material is placed in the magnetic material receiving portion with the gap in the inserted state,
One side of the magnetic body is attached to the support member in a state of being inserted into the magnetic body accommodating part, thereby maintaining the gap spaced apart from the inner surface of the magnetic body accommodating part by a predetermined distance,
When the center point of the magnetic material is located directly above the center point of the permanent magnet, the magnetic material receiving portion has a size larger than that of the permanent magnet so that the magnetic field shielding sheet is not disposed in an area directly above the area corresponding to the permanent magnet. is formed,
The gap completely blocks direct contact between the magnetic field shielding sheet and the magnetic material to prevent the magnetic field shielding sheet from being magnetized by the DC magnetic field generated from the permanent magnet,
The width of the gap is 10㎛ to 1mm, the same as the thickness of the blade or mold used for punching the wireless power transmission module. 10. The method of claim 9,
The antenna is a combo-type wireless power transmission module including at least two antennas among an antenna for wireless power transmission, an MST antenna, and an NFC antenna. delete 10. The method of claim 9,
The support member is a heat dissipation sheet or the support member is an adhesive member having an adhesive layer formed on at least one surface of the wireless power transmission module. 10. The method of claim 9,
The support member is a wireless power transmission module that is a thin metal sheet made of a metal material. 14. The method of claim 13,
The metal sheet is a wireless power transmission module including at least one pattern formed through. 15. The method of claim 14,
The pattern is a wireless power transmission module including at least one of a slit having a predetermined width and length and a through hole having a predetermined area. delete delete Claims 9, 10, and claim 12 to 15, wherein the wireless power transmission module according to any one of claims is installed in the rear case or back cover of the mobile terminal body of the mobile terminal capable of wireless charging.

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