KR20190006427A - Wireless battery charging module - Google Patents

Abstract

According to an aspect of the present invention, a wireless charging transmission module comprises: plurality of coil units; a magnetic shielding sheet covering one side of the plurality of coil units; and a heat radiation plate arranged to cover the magnetic shielding sheet. Therefore, the wireless charging transmission module can more effectively radiate heat through the heat radiation plate.

Description

{WIRELESS BATTERY CHARGING MODULE}

The present invention relates to a wireless charging transmission module, and more particularly, to a wireless charging transmission module capable of efficiently dissipating heat generated in a coil unit while being lightweight.

2. Description of the Related Art In recent years, the use of a wireless charging transmission module that can easily charge a battery of a portable terminal in a vehicle has been increasing.

In the case of wireless charging in the vehicle, since the mobile phone needs to be charged in a wide space such as the console box, a wireless charging transmission module having three coil units of the WPC standard having a large chargeable area in order to continue charging even when the position of the mobile phone is moved Has been used.

Such a wireless charging transmission module includes a magnetic field absorbing material adapted to absorb a magnetic field generated in a coil unit.

In the conventional automobile industry, a method of placing a coil unit by injecting a low permeability SENDUST material with a magnetic field absorbing material is used, or a method of attaching a coil unit on a thin film ferrite having a high permeability is used.

However, there is a problem that the permeability of the Sendust material is low and the efficiency is low. In the case of the thin film ferrite, it is difficult to place the coil unit because it is easily broken due to the brittleness of the thin film ferrite.

Further, in order to allow the wireless charging transmission module to perform high-speed wireless charging, the wireless charging transmission module must be supplied with high power. When high power is supplied to the wireless charging transmission module, the coil units generate more heat than the proper level. Therefore, it is difficult to use the high power for the wireless charging transmission module due to the heat generated in the coil units, thereby limiting the wireless charging speed.

Therefore, a material and structure technology capable of stably mounting a coil unit on a high magnetic permeability magnetic absorber and having excellent heat dissipation capability, minimizing heat generation and minimizing manufacturing variations even at high-speed charging were required.

One aspect of the present invention is to provide a wireless charging transmission module capable of efficiently dissipating heat of a coil unit.

Another aspect of the present invention is to provide a wireless charging transmission module capable of achieving a sufficient magnetic shielding effect and a heat dissipation capability while reducing the weight.

A wireless charging transmission module according to an aspect of the present invention includes a plurality of coil units, a magnetic shielding sheet disposed on one side of the plurality of coil units, and a heat dissipation plate attached to one side of the magnetic shielding sheet.

Further, a heat dissipation bracket accommodating the plurality of coil units is included, and the heat dissipation bracket includes graphite.

Also, the magnetic shielding sheet is formed of a Ni-Zn ferrite sheet, and the heat dissipation plate is made of a metal material.

The heat dissipation plate is made of aluminum.

The thickness (A) of the magnetic shielding sheet and the thickness (B) of the heat dissipation plate satisfy a relation of "0 <A / B <1".

Further, the magnetic shielding sheet is formed to be 0.5 mm or less.

The magnetic shielding sheet is disposed to cover the exposed surface of the magnetic shielding sheet covering one side of the heat dissipating bracket.

The heat dissipation plate is disposed to cover the exposed surface and the outer end of the magnetic shielding sheet covering one side of the heat dissipation bracket.

The plurality of coil units may include a first coil unit disposed on one side of the heat dissipation bracket and a pair of second coil units disposed side by side on the other side of the heat dissipation bracket, And overlaps with the second coil units of the pair.

The heat dissipation bracket may include a first seating groove provided on the first surface to receive the first coil unit and a second seating groove provided on the second surface opposite to the first surface to receive the pair of second coil units. Wherein the first seating groove and the pair of second seating grooves overlap with each other to form an overlapping area, and the magnetic shielding sheet prevents the second surface of the heat dissipation bracket Respectively.

Also, at least some of the overlapping regions may penetrate the heat dissipating bracket. And the first seating groove and the pair of second seating grooves communicate with each other through the partial region.

The first seating groove has a depth equal to the thickness of the first coil unit, and the pair of second seating grooves has a depth equal to the thickness of the pair of second coil units.

The first coil unit may further include a first support portion protruded from the first seating groove to support an inner side of the first coil unit and a second support portion protruding from the pair of second seating grooves to support the inside of the pair of second coil units And a pair of second supporting portions.

The first support portion has a height equal to the depth of the first support recess, and the pair of second support portions have the same height as the depths of the pair of second support recesses.

As described above, the wireless charging transmission module according to one aspect of the present invention can more efficiently diffuse and dissipate heat generated from the coils through the heat dissipation bracket and the heat dissipation plate.

In addition, since the wireless charging transmission module according to another aspect of the present invention uses a Ni-Zn ferrite sheet as a magnetic shielding member, it can be lightweight while maintaining a sufficient magnetic shielding effect.

1 is a perspective view of a wireless charging transmission module according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional perspective view of the wireless charging transmission module of FIG. 1 taken along line AA '.
3 is an exploded perspective view of the wireless charging transmission module of FIG.
4 is a bottom exploded perspective view of the wireless charging transmission module of FIG.
5 is a plan view showing a stacked state of a plurality of coil units in a wireless charging transmission module according to a first embodiment of the present invention.
6 is a plan view showing an example of forming the seating grooves in the wireless charging transmission module according to the first embodiment of the present invention.
7 is a cross-sectional perspective view of a heat dissipating bracket according to a second embodiment of the present invention.
8 is a schematic diagram of a wireless charging transmission module according to a first embodiment of the present invention.
9 is a cross-sectional perspective view of a wireless charging transmission module according to a third embodiment of the present invention.

Like reference numerals refer to like elements throughout the specification. The present specification does not describe all elements of the embodiments, and redundant description between general contents or embodiments in the technical field of the present invention will be omitted. As used herein, the term 'module' may be embodied in software or hardware, and it is to be understood that a plurality of modules may be implemented as a single component, And the like.

Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms first, second, etc. are used to distinguish one element from another, and the elements are not limited by the above-mentioned terms.

The singular forms &quot; a &quot; include plural referents unless the context clearly dictates otherwise.

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

FIG. 2 is a cross-sectional view of the wireless transmission transmission module of FIG. 1 taken along line AA ', and FIG. 3 is a cross-sectional view of the wireless transmission transmission module of FIG. FIG. 4 is an exploded perspective view of the wireless charging transmission module of FIG. 1 viewed from the opposite direction. FIG. 4 is an exploded perspective view of the wireless charging transmission module of FIG.

1 to 4, a wireless charging transmission module 100 according to a first embodiment of the present invention includes a plurality of coil units 111 and 112, a heat dissipation bracket 120, a magnetic shielding sheet 130 And a heat dissipation plate 140.

The wireless charging transmission module 100 according to the present invention is for transmitting wireless power to an electronic device that requires charging. Here, the electronic device may be a portable electronic device such as a mobile phone, a PDA, a PMP, a tablet, a multimedia device, and the like. The wireless charging transmission module 100 may also be provided or installed in the vehicle.

The coil units 111 and 112 transmit radio power and transmit power required by the electronic equipment. The coil units 111 and 112 serve as transmission coils for transmitting radio power to the reception coil side built in the electronic equipment. In this case, an induction coupling method based on the electromagnetic induction phenomenon can be applied. The coil units 111 and 112 may be configured in various ways, for example, a flat coil.

On the electronic device side, a separate reception antenna (for example, a reception coil unit (Rx coil)) corresponding to the coil units 111 and 112 is provided. A current is induced in the receiving antenna through a change in the magnetic field in the coil units 111 and 112, whereby electric power is transmitted.

The coil units 111 and 112 can operate in the Qi mode, the PMA mode, and the Qi mode and the PMA mode.

The coil units 111 and 112 may be provided in a circular, elliptical or rectangular flat plate shape in which a predetermined length of conductive member having a pair of connection terminals on both end sides thereof is wound a plurality of times in a clockwise or counterclockwise direction . Here, the conductive member may be made of a conductive metal such as copper, and a plurality of strands having a predetermined diameter may be twisted along the longitudinal direction.

A plurality of coil units 111 and 112 may be provided, and a plurality of coil units 111 and 112 may be stacked so that at least a part thereof overlaps with each other. 5 is a view showing an example of a state in which a plurality of coil units 111 and 112 are stacked so as to overlap with each other, and a WPC A13 standard coil is shown as an example.

5, three coil units 111 and 112 may be provided, and any one coil unit 111 of the three coil units 111 and 112 may be connected to the other two coil units 112, A1, A2, A3, and A4, and the remaining two coil units 112 are partially overlapped with each other.

Hereinafter, for convenience of description, any of the above-described coil units 111 will be referred to as a first coil unit 111, and the remaining two coil units 112 disposed on the same plane will be referred to as a pair of second coil units 111. [ (112). However, the arrangement of the coils according to the present invention is not limited to the combination and arrangement relationship as shown in Fig. 5, and the arrangement relationship of the first coil unit 111 and the second coil unit 112 and the total number of coil units It is to be understood that the present invention can be variously modified.

The heat dissipation bracket 120 is for fixing the positions of the plurality of coil units 111 and 112. That is, when a plurality of coil units 111 and 112 are stacked so as to overlap with each other, an overlapping region between the coil units 111 and 112 can be overlapped with a desired position and area.

3 and 4, the heat dissipation bracket 120 is formed of a plate-like member having a first surface 120a and a second surface 120b opposite to each other and having a predetermined area, At least one seating groove 121 and 122 may be formed in the surface 120a and the second surface 120b to be recessed to a predetermined depth.

The plurality of seating grooves 121 and 122 are formed in the same plane as the first seating groove 121 for receiving the first coil unit 111 disposed in the upper portion of the plurality of coil units 111 and 112, And two second seating grooves 122 for respectively receiving two second coil units 112 disposed on the first coil unit 112. [

6 is a view showing an example of formation of a plurality of seating grooves 121 and 122. As shown in FIG.

Referring to FIG. 6, the first seating groove 121 and the second seating groove 122 are formed on opposite surfaces, respectively. That is, the first seating groove 121 is formed on the first surface 120a of the heat dissipating bracket 120, and the second seating groove 122 is formed on the second surface 120b of the heat dissipation bracket 120.

The first seating groove 121 and the second seating groove 122 are formed on the first surface 120a and the second surface 120b so as to form overlapping areas S1 and S2 in which at least some areas overlap each other .

Accordingly, when the operator inserts the first coil unit 111 into the first seating groove 121 and inserts the second coil units 112 into the second seating grooves 122, the above-described overlapping area S1 The first coil unit 111 is arranged to overlap with the second coil unit 112 at positions corresponding to the partial areas S11 and S22 of the first coil unit 111 and the second coil unit S2.

At this time, some areas S11 and S22 of the overlapping areas S1 and S2 are formed to penetrate through the heat dissipating bracket 120. [ Therefore, some of the areas S11 and S22 of the overlapping areas S1 and S2 are connected to each other through the first and second seating grooves 121 and 122, A part of the unit 111 can be brought into contact with a part of the second coil units 112 disposed in the second seating grooves 122. [

Therefore, if the position and area are formed so as to meet the required specifications in the overlapped area overlapping each other in the process of forming the first and second seating grooves 121 and 122, The alignment between the coil units 111 and 112 can be completed.

The heat dissipation bracket 120 includes supporting portions 123 and 124 protruding from the center of the first and second seating grooves 121 and 122 so as to correspond to empty spaces at the center of the coil units 111 and 112 .

The supporting portions 123 and 124 are provided at the central portion of the first seating groove 121 with a first supporting portion 123 protruding from the bottom surface of the first seating groove 121 to a predetermined height, And a second support portion 124 protruding from the bottom surface of the second seating groove 122 at a predetermined height.

Here, the first support portion 123 and the second support portion 124 may be formed to have the same height as the depth of the respective seating recesses 121 and 122.

The supporting portions 123 and 124 may be positioned in the center empty space of the coil units 111 and 112 when the coil units 111 and 112 are inserted and may be in contact with the inside of the coil units 111 and 112. As a result, the coil units 111 and 112 inserted into the respective seating grooves 121 and 122 are respectively supported by the supporting portions 123 and 124 while the outside is supported by the inner walls of the seating grooves 121 and 122 . The position of the first coil unit 111 and the position of the second coil unit 112 can be detected by the respective seating grooves 121 and 122 even if the shaking of the wireless charging transmission module 100, 122 to prevent the respective coil units 111, 112 from flowing.

At this time, the supporting portions 123 and 124 may be provided to have a shape and an area corresponding to the center empty space of the coil units 111 and 112. Accordingly, some of the supporting portions 123 and 124 are disposed in the overlapping area where the first seating groove 121 and the second seating groove 122 overlap each other, The two seating grooves 122 are arranged in areas where they do not overlap with each other.

A partial area of the first support portion 123 formed in the first seating groove 121 and disposed in the overlapping regions S1 and S2 corresponds to a portion of the coil units 112 disposed in the second seating groove 122 And is disposed in the overlapping areas S1 and S2 among the second support parts 124 formed in the second seating groove 122 A part of the coil unit 111 is directly contacted with a part of the coil unit 111 disposed in the first seating groove 121 to support a part of the coil unit 111 disposed in the first seating groove 121.

In this case, each of the coil units 111 and 112 is divided into the overlapping areas A1, A2, A3, and A4 of one side, The heat generated in the coil units 111 and 112 is absorbed by the heat dissipating bracket 120 and the heat dissipating bracket 120 is prevented from being damaged. So that it can be quickly diffused through. Here, the heat dissipation function of the heat dissipation bracket 120 will be described later in the related part.

The first seating groove 121 and the second seating groove 122 may be formed to have the same depth as that of the coil units 111 and 112. The thickness of the heat- The coil units 111 and 112 may have the same thickness as the sum of the thicknesses of the coil units 111 and 112. That is, the thickness of the heat dissipation bracket 120 may be the same as the thickness of the first coil unit 111 and the second coil unit 112.

Accordingly, the wireless charging transmission module 100 according to the present invention can prevent the increase in the thickness of the coil units 111 and 112 even when the heat dissipation bracket 120 for aligning the positions of the coil units 111 and 112 is used, So that they can be easily aligned.

One side of the heat dissipation bracket 120 including one surface of the coil units 111 and 112 after the coil units 111 and 112 are accommodated in the seating grooves 121 and 122 formed in the heat dissipation bracket 120 has a horizontal surface So that the contact area with the magnetic shielding sheet 130 can be widened. Accordingly, since the magnetic shield sheet 130 can be supported by the heat dissipation bracket 120, the magnetic shield sheet 130 can be applied even if the magnetic shield sheet 130 is made of a flexible or brittle sheet.

A guide groove 125 for receiving a pair of connection terminals 111a and 112a provided in the coil units 111 and 112 may be formed on at least one surface of the heat dissipation bracket 120. The guide groove 125 is formed so as to communicate with at least one of the first seating groove 121 and the second seating groove 122 so that the connection of the coil units 111 and 112 accommodated in the seating grooves 121 and 122 So that the terminals 111a and 112a can be appropriately arranged. For example, the guide groove 125 may be formed on the second surface 120b of the heat dissipating bracket 120, but the surface on which the guide groove 125 is formed is not limited to the second surface 120b.

The guide groove 125 is formed to have a height substantially equal to the diameter of the conductive member constituting the coil units 111 and 112. When the magnetic shielding sheet 130 is disposed on one surface of the heat dissipation bracket 120, One surface of the first coil unit 111 and the second coil unit 112 can be fully interposed on one surface of the magnetic shielding sheet 130.

The heat dissipation bracket 120 applied to the wireless charging transmission module 100 according to the present invention facilitates the placement of the coil units 111 and 112 and fixes the position thereof, A heat dissipating function may be provided to dissipate heat generated by the coil units 111 and 112 during the operation of the coil units 111 and 112 rapidly.

7 is a view showing a heat dissipating bracket 120 according to a second embodiment of the present invention.

The heat dissipating bracket 120 according to the present embodiment is formed with a heat dissipating coating layer 126 on its outer surface.

The heat dissipation bracket 120 may be made of a plastic material having heat dissipation property, and a coating layer 126 having heat dissipation property may be formed on an outer surface of the heat dissipation bracket 120 made of a heat dissipating plastic material.

The heat-radiating coating layer 126 may be formed of a coating composition composed of an epoxy and a graphite mixed composition.

However, the type of the coating layer 126 is not limited thereto, and the epoxy resin may include a material such as a thermally conductive filler such as a carbon-based filler, a graphene, a carbon nanotube, and a brononite.

As the heat-releasing plastic, a material in which graphite is added to the base resin may be used. The base resin may include at least one selected from the group consisting of a polycarbonate (PC) resin, an acrylonitrile-butadiene-styrene (ABS) resin, a PA6 resin, a PA66 resin, a polypropylene (PP) According to the embodiment, not only graphite but also dopamine-coated nickel (Ni) may be added to the base resin.

In this embodiment, the heat dissipation bracket 120 is formed of a material in which graphite is added to the base resin.

However, the material of the coating layer 126 for heat dissipation and / or the material of the heat dissipation plastic is not limited thereto, and it is noted that both the known coating material and the heat dissipation plastic used for heat dissipation can be used.

Meanwhile, the heat dissipation bracket 120 may be formed with at least one fastening hole for coupling with other members. Such a fastening hole can be engaged or passed through a fastening member such as a bolt member.

When the heat dissipation bracket 120 is made of a plastic material, a metal member having a predetermined area is partially embedded in the heat dissipation bracket 120 so as to prevent the heat dissipation bracket 120 from being broken when the heat dissipation bracket 120 is coupled with other components by the fastening member. And the fastening hole is formed at a position corresponding to the metal member, thereby enhancing the fastening force and durability. Here, the metal member may be integrated with the heat dissipation bracket 120 through the insert molding, but the manner of coupling the metal member and the heat dissipation bracket 120 is not limited thereto.

The magnetic shielding sheet 130 is disposed on one side of the coil units 111 and 112 to shield the magnetic field generated by the wireless power signal induced in the coil units 111 and 112 and to focus the magnetic field in a desired direction .

The magnetic shielding sheet 130 is formed of a plate-like member having a predetermined area and is disposed to cover the second surface 120b of the heat dissipating bracket 120. [ The magnetic shield sheet 130 is made of a magnetic material so as to shield the magnetic field and focus the magnetic field in a desired direction.

The magnetic shield sheet 130 includes a sensor sheet, a Mn-Zn ferrite sheet, a Ni-Zn ferrite sheet, or the like, which includes a polymer in a Fe-Si-Al powder that is a material capable of shielding a magnetic field .

In order to obtain a sufficient magnetic shielding effect, the sensor sheet must be formed to have a thickness of 2.3 mm or more because it is applied to the wireless charging transmission module 100 of the present embodiment, do.

Further, in the case of the Mn-Zn ferrite sheet, although it can be formed to have a thin thickness as compared with the sensor sheet, the weight reduction effect of the material itself is not large.

Therefore, in the present embodiment, a Ni-Zn ferrite sheet is used as the magnetic shielding sheet 130.

The Ni-Zn ferrite sheet was thin and light in comparison with the Mn-Zn ferrite sheet. As a result, the Ni-Zn ferrite sheet was found to have a thickness of 1.6 mm and a thickness of 2.3 mm A shielding effect similar to that of a sheet can be obtained. In addition, when the Ni-Zn ferrite sheet is formed to have such a thickness, a weight reduction effect of about 32% can be obtained as compared with the case where the Ni-Zn ferrite sheet is formed of a sensor sheet.

Further, in order to secure flexibility, the Ni-Zn ferrite sheet is subjected to a plate process for crushing into fine pieces after sintering. Therefore, when the Ni-Zn ferrite sheet is used as the magnetic shield sheet 130, damage to the magnetic shield sheet 130 due to the external impact and change in the magnetic properties of the magnetic shield sheet 130 can be prevented.

The magnetic shielding sheet 130 covering one side of the heat dissipating bracket 120 includes a corresponding one side of the heat dissipating bracket and an exposed surface exposed to the outside on the opposite side, A heat dissipation plate 140 for facilitating the diffusion of heat is disposed. The heat dissipation plate 140 is disposed so that one surface thereof covers the exposed surface of the magnetic shielding sheet 130.

Therefore, heat generated in the coil units 111 and 112 can be diffused and radiated more quickly through the heat dissipation plate 140. [

The heat dissipation plate 140 is formed of a plate-like member having a predetermined area corresponding to the magnetic shielding sheet 130, and is disposed to cover the outer surface of the magnetic shielding sheet 130. The heat dissipation plate 140 is formed of a metal material having a high thermal conductivity. The heat dissipation plate 140 may be made of aluminum, but is not limited thereto. Any material can be used as long as the heat dissipation plate 140 is made of a metal material having excellent thermal conductivity such as stainless steel, copper, or the like.

The magnetic shield sheet 130 and the heat dissipation plate 140 may be formed to have a constant relationship with each other. For example, when the thickness of the magnetic shielding sheet 130 is A and the thickness of the heat dissipating plate 140 is B, the thickness of the heat dissipating plate 140 can be thicker than the thickness of the magnetic shielding sheet 130 , The following relation can be satisfied.

[Relation 1]

0 < A / B < 1

In this embodiment, the magnetic shielding sheet 130 has a thickness of 01 mm and the heat dissipating plate 140 has a thickness of 1 mm. That is, the thickness of the heat dissipating plate 140 may be thicker than the thickness of the magnetic shielding sheet 130. Preferably, the thickness of the heat dissipating plate 140 is two times the thickness of the magnetic shielding sheet 130 Or more. However, the present invention is not limited to this, and the thickness of the magnetic shield sheet 130 and the heat dissipation plate 140 can be adjusted within a range satisfying the above-mentioned [Relation 1], if necessary.

FIG. 8 shows a schematic diagram of a wireless charging transmission module 100. FIG.

The wireless charging transmission module 100 includes a coil unit 111 and 112, a heat dissipation bracket (not shown), a magnetic shielding sheet 130, and a heat dissipation plate 140, A substrate 150 and a cover 16 that forms the appearance of the wireless charging transmission module 100 and accommodates the configurations of the wireless charging transmission module 100 described above.

In the case of the wireless charging and transmitting module 100 having the printed circuit board 150, EMI (Electro Magnetic Interference) is inevitably generated in the printed circuit board 150 during the operation of the printed circuit board 150 The heat dissipation plate 140 is not only formed of an aluminum material such as metal as described above but also disposed between the magnetic shield sheet 130 and the printed circuit board 150, Thereby preventing the EMI generated in the substrate 150 from being transmitted to the magnetic shielding sheet 130 side. That is, the heat dissipation plate 140 made of a metal also functions to shield EMI.

Therefore, the magnetic field generated in the coil units 111 and 112 is prevented from being disturbed by the EMI generated in the printed circuit board 150, thereby reducing inductance and increasing resistance of the coil units 111 and 112 due to EMI .

In this embodiment, the heat dissipation plate 140 is formed to cover the exposed surface of the magnetic shielding sheet 130 covering one side of the heat dissipation bracket 120, but is not limited thereto.

9 shows a wireless charging transmission module 100 according to a third embodiment of the present invention.

The heat dissipation plate 140 'according to the third embodiment of the present invention is disposed so as to cover not only the outer surface of the magnetic shield sheet 130' but also the outer ends of the magnetic shield sheet 130 ' So that it can diffuse more quickly than the heat transmitted through the outer end of the heat exchanger.

In addition, according to the embodiment, the magnetic shielding sheet 130 may be flaked to be divided into a plurality of fine pieces. When the magnetic shielding sheet 130 is formed of a thin plate magnetic sheet material using amorphous metal instead of Ni-Zn ferrite, have.

The structure of the heat dissipation bracket 120 and the wireless charging transmission module 100 including the same has been described above.

According to the above-described heat dissipation bracket and the wireless charging transmission module 100 including the same, the following effects can be expected.

First, since the coil units 111 and 112 and the heat dissipation bracket 120 are disposed adjacent to each other, the heat generated in the coil units 111 and 112 can be effectively removed. In addition, by applying the heat dissipating bracket 120 having the heat dissipating function to the wireless charging and transmitting module 100, it is possible to improve the heat generation problem generated in the operation of the coil units 111 and 112.

In addition, the seating grooves 121 and 122 are formed on one surface and the other surface of the heat dissipating bracket 120 so that the plurality of coil units 111 and 112 can be easily disposed according to the certification standard. As a result, the assembly productivity can be enhanced and the positions of the coil units 111 and 112 can be fixed through the seating grooves 121 and 122, thereby preventing the alignment position between the reception coil and the transmission coil from being changed, .

Hereinafter, in order to evaluate the efficiency and heat dissipation of the wirelessly-charged component, a coil assembly specimen was manufactured using the heat-dissipating bracket 120 according to the published invention, and an experiment was conducted to measure the charging efficiency by applying the coil- .

[Example 1], [Example 2], [Comparative Example 1] and [Comparative Example 2] were prepared as described below, and the charging efficiency was measured by applying it to a wireless charging device.

[Example 1]

A Ni-Zn ferrite film and a coil assembly specimen to which a heat-dissipating bracket according to the published invention is applied are applied to a wireless recharging part.

[Example 2]

And the coating layer is formed on the surface of the heat dissipation bracket of [Example 1].

[Comparative Example 1]

This is the case when the coil assembly is applied to the wireless rechargeable parts by injecting the Sendust material and fixing the coil.

[Comparative Example 2]

This is the case where a coil-attached specimen with a coil attached to a Ni-Zn ferrite film is applied to a wireless charging device.

[Example 1], [Example 2], [Comparative Example 1] and [Comparative Example 2] The results of evaluating the wireless charging efficiency and the heat generation of the wireless charging transmission module 100 to which the test piece was applied are shown in the following Table 1 ].

division Charging efficiency (5W,%) @ 800mA Heating temperature (℃) One 2 3 4 5 Example 1 51.6 51.5 51.6 51.6 51.6 41.3 Example 2 51.8 51.7 51.7 51.7 51.8 39.8 Comparative Example 1 50.4 49.5 48.0 49.4 50.2 45.2 Comparative Example 2 50.2 49.1 50.8 48.1 46.5 45.3

As a result of the experiment, it was confirmed that the variation of the charging efficiency was small and the heat generation temperature was low as compared with [Comparative Example 1] and [Comparative Example 2] in [Example 1] and [Example 2].

The embodiments disclosed with reference to the accompanying drawings have been described above. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. The disclosed embodiments are illustrative and should not be construed as limiting.

100: Wireless charging transmission module
111, 112: coil unit
120: heat dissipation bracket
121: first seat groove
122: second seat groove
123: first support portion
124: second support portion
125: Guide groove
126: Coating layer
127: fastening ball
130: magnetic shield sheet
140: heat radiating plate

Claims (11)

A first coil unit,
A pair of second coil units overlapping the first coil unit,
And a second coil unit provided on the first surface and accommodating the first coil unit and a second surface opposite to the first surface to receive the pair of second coil units, A heat dissipating bracket including a pair of second seating grooves overlapping one seating groove to form an overlapping region;
A magnetic shielding sheet disposed to cover the second surface of the heat dissipating bracket;
And a heat dissipation plate disposed to cover the outer end of the magnetic shield sheet together with the exposed surface of the magnetic shield sheet to allow heat to diffuse and dissipate more quickly. The method according to claim 1,
Wherein the heat dissipation bracket comprises graphite. The method according to claim 1,
Wherein the magnetic shielding sheet is formed of a Ni-Zn ferrite sheet,
Wherein the heat dissipation plate is formed of a metal material. The method of claim 3,
Wherein the heat dissipation plate is formed of an aluminum material. 5. The method of claim 4,
Wherein the thickness (A) of the magnetic shielding sheet and the thickness (B) of the heat dissipation plate satisfy a relation of "0 <A / B <1". 6. The method of claim 5,
Wherein the magnetic shielding sheet is formed to be 0.5 mm or less. The method according to claim 1,
At least a part of the overlap region may penetrate the heat dissipation bracket. And the first seating groove and the pair of second seating grooves communicate with each other through the partial region. The method according to claim 1,
Wherein the first seating groove has a depth equal to the thickness of the first coil unit,
Wherein the pair of second seating grooves have a depth equal to the thickness of the pair of second coil units. The method according to claim 1,
A first support portion protruding from the first seating groove for supporting the inside of the first coil unit,
And a pair of second supporting portions protruding from the pair of second seating grooves to support the inside of the pair of second coil units. 10. The method of claim 9,
Wherein the first support portion has a height equal to a depth of the first seating groove,
And the pair of second supporting portions have the same height as the depths of the pair of second receiving grooves. The method according to claim 1,
And an end of the heat dissipation plate covering the outer end of the magnetic shield sheet contacts the heat dissipation bracket.

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