KR20170018677A - wireless charging transmission module for car - Google Patents

Abstract

Provided is a wireless charging transmission module for a vehicle. According to an embodiment of the present invention, the wireless charging transmission module for a vehicle comprises: an antenna unit which is provided with at least one planar coil; a magnetic plate which is arranged on one side of the antenna unit, shields the magnetic field generated from the antenna unit to focus the magnetic field in a desired direction, and is manufactured by injection-molding a material mixed with magnetic powder and heat-resistant resin; and a cover member which prevents vibration and shaking of the planar coil.

Description

Technical Field [0001] The present invention relates to a wireless charging transmission module for car,

The present invention relates to a vehicle wireless charging transmission module, more specifically to a hybrid vehicle having a resistance to vibrations and loads generated when a vehicle is traveling and to improve the charging efficiency by fixing the position of the antenna unit and increasing the collection speed of the magnetic field To a vehicle wireless charging transmission module.

2. Description of the Related Art [0002] In recent years, the use of mobile devices such as mobile phones, smart phones, tablet PCs, notebooks, digital broadcasting terminals, PDAs (Personal Digital Assistants), portable multimedia players (PMPs) Is increasing.

Accordingly, the surrounding environment related to the use of the mobile terminal is spreading to a dynamic space such as a vehicle.

As a result, the use of a charger capable of easily charging a battery of a terminal even in a vehicle is increasing.

As a method of electrically connecting a charger and a terminal (or a battery) when charging a battery in a vehicle, a charger connected to a vehicle power source is connected to a terminal through a contact terminal or a cable to supply electric energy.

Among these, in the terminal supply system including the contact terminals in the charger and the terminal, there is a fear that the charge energy is lost when the battery is exposed to moisture or a fire is generated due to the instantaneous discharge phenomenon when the battery is contacted / disconnected. It may not be possible to do so.

Therefore, a non-contact type charging system using a wireless power transmission system without constituting a contact terminal is proposed.

The contactless charging system supplies electric energy supplied from a vehicle power source in a wireless transmission mode. The charging system includes a wireless charging transmission module embedded in a vehicle, a wireless charging module Module.

As an example of such a non-contact type charging method using a magnetic induction method is widely used. It has a primary coil (serving as a power transmitting coil) in the wireless charging transmission module and a secondary coil (serving as an induction coil and a power receiving coil) in the wireless charging and receiving module of the terminal. When the terminal approaches the charger And the terminal is charged by inductive coupling between the primary coil and the secondary coil.

At this time, a shielding sheet for increasing the charging efficiency is provided on the side of the wireless charging transmission module and the wireless charging and receiving module by inducing a magnetic field generated from the coil to increase the collection speed. As the shielding sheet, a polymer sheet, a ferrite sheet, Is used.

Although the double ferrite sheet has a lowered saturation magnetic flux density than permalloy, it has a high resistance due to the characteristics of the material itself, and thus is widely used as a shielding unit because the loss due to eddy current is small even in a high frequency range.

In particular, the Mn-Zn ferrite in the ferrite exhibits excellent characteristics in a frequency band of 10 kHz to several hundred kHz including an operating frequency band of 100 to 350 kHz used for wireless charging by a magnetic induction method, Is widely used as a shielding sheet.

However, when the shielding sheet 20 is made of only Mn-Zn ferrite, the brittleness is strong due to the characteristics of the material itself, so that the shielding sheet 20 is easily broken by repetitive vibration and impact applied from the outside. There is a problem that the charging efficiency is lowered.

Accordingly, when the solid state charging system using the electromagnetic induction method is directly applied to the vehicle, the shielding sheet is cracked or cracked due to vibration and impact repeatedly generated during operation of the vehicle. In such a case, the shielding sheet has a problem that the characteristic value initially set is changed and the charging efficiency is lowered. In addition, in order to replace the wireless charging transmission module mounted in the vehicle, replacement work is troublesome and requires a large replacement cost.

Meanwhile, in the case of wireless charging by magnetic induction method, when the terminal including the wireless charging and receiving module is in close proximity to the wireless charging transmission module, the position between the primary coil of the wireless charging transmission module and the secondary coil of the terminal If you give it, it will be charged properly.

Therefore, when the primary coil constituting the wireless charging transmission module is shaken due to vibration and wobble during traveling of the vehicle, the secondary coil of the terminal side is out of alignment and the charging efficiency is drastically lowered .

KR 10-2015-0159465 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic plate for inducing a magnetic field generated in an antenna unit and an injection molded article including a heat resistant resin, And it is an object of the present invention to provide a wireless charging transmission module for a vehicle, which can prevent damage to the magnetic plate by increasing immunity to the magnetic field.

It is another object of the present invention to provide a wireless charging transmission module for a vehicle which can prevent the antenna unit from swinging and fix the position of the antenna unit, thereby enhancing wireless charging efficiency.

Further, the present invention provides a wireless charging transmission module for a vehicle in which a side portion of an antenna unit is enclosed through a magnetic plate to increase a magnetic flux collecting speed to obtain a charging efficiency equal to that of a material having a high magnetic permeability even if a material having a low permeability is used There is another purpose.

According to an aspect of the present invention, there is provided an antenna unit including at least one plate type coil. A magnetic plate disposed on one surface of the antenna unit so as to shield a magnetic field generated by the antenna unit and focus the same in a desired direction; And a cover member for preventing vibration and shaking of the flat coil.

The magnetic plate may have a magnetic permeability of 20 to 110, an Tan ㅿ (= 占 / / 占 ') of 0.05 or less and a saturation magnetic flux density of 0.5T (Where μ 'is the permeability and μ' is the investment loss rate).

In addition, a guide for preventing the flow of the planar coil and increasing the velocity of the magnetic field may be provided on one surface of the magnetic plate.

The guide portion may include a first guide portion that is provided to cover the entire outer edge of the planar coil, and a second guide portion that is disposed in a region corresponding to the hollow portion of the planar coil. At this time, the magnetic plate is provided with a receiving groove formed in a region corresponding to the flat coil, and the first guide portion is an inner rim surface defining the receiving groove, And a protruding portion protruding from the bottom surface of the receiving groove at a predetermined height.

The magnetic plate may be injection molded by mixing a magnetic powder and a heat resistant resin, and the weight ratio of the magnetic powder and the heat resistant resin may be 70:30 to 95: 5. Here, the magnetic powder may be any one of Fe-Si-Al-based metal polymer and Fe-Si-Cr-based metal polymer.

Also, the cover member may be formed through epoxy molding so as to cover one surface of the magnetic plate including the planar coil.

One of the planar coils is disposed on the upper side of the other two planar coils, and the remaining two planar coils are partially overlapped with each other. .

The cover member may be made of a rigid material, and at least one protrusion may protrude from the inner surface of the cover member corresponding to the flat coil so that the flat coil may be in close contact with the inner surface of the cover member .

The cover member may be made of a rigid material, and a buffer member may be disposed between the inner surface of the cover member and the flat coil.

According to the present invention, a magnetic plate for inducing a magnetic field generated in an antenna unit is formed of an injection material containing a heat resistant resin, so that even when vibration or shaking occurs during running of the vehicle, resistance to vibration and impact is increased, It is possible to prevent the charging efficiency from being lowered.

Further, according to the present invention, the antenna unit is prevented from wobbling to fix the position of the antenna unit, thereby preventing the alignment position between the reception coil and the transmission coil from being changed, thereby preventing the charging efficiency from being deteriorated.

Further, according to the present invention, the side portion of the antenna unit is enclosed by the magnetic plate, thereby increasing the magnetic flux collecting speed and obtaining a charging efficiency equivalent to that of a material having a high magnetic permeability, even if a material having a low permeability is used.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing a conventional wireless charging transmission module,
FIG. 2 is a schematic diagram showing a wireless charging transmission module for a vehicle according to an embodiment of the present invention;
Fig. 3 is a sectional view of Fig. 2,
4 is a view showing a magnetic plate applied to a wireless charging transmission module for a vehicle according to an embodiment of the present invention,
Fig. 5 is a modification of Fig. 4, in which a part of the first guide portion is opened,
6 is a view illustrating a case where the cover member is provided in a different form in the wireless charging transmission module for a vehicle according to the embodiment of the present invention;
7 is a view showing a case where a buffering member is provided in a wireless charging transmission module for a vehicle according to an embodiment of the present invention;
FIG. 8 is a view showing the separation of FIG. 7,
FIG. 9 is a schematic view showing a case where two flat type coils are provided in a wireless charging transmission module for a vehicle according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

As shown in FIGS. 2 to 9, the wireless transmission transmission modules 100, 200, 300, and 400 according to an embodiment of the present invention are for transmitting radio signals to the electronic devices to be charged in the vehicle, Magnetic plates 120 and 120 ', and cover members 140, 240 and 340.

The antenna units 110 and 210 transmit radio signals to a portable electronic device such as a cellular phone, a PDA, a PMP, a tablet, and a multimedia device to transmit power required by the portable electronic device.

The antenna units 110 and 210 may be circular, elliptical or rectangular plate-shaped coils each having a pair of connection terminals 112a and 112b at both ends thereof and having a predetermined length of the conductive member wound in a clockwise or counterclockwise direction a plurality of times (110a, 110b, 110c) and fixed to one surface of the magnetic plate 120, 120 '. At this time, the conductive member may be made of a conductive metal such as copper, and may have a plurality of strands having predetermined diameters twisted along the longitudinal direction.

The planar coils 110a, 110b, and 110c transmit a radio signal to the reception coil side built in the portable electronic device and serve as a transmission coil for producing power through an inductive coupling method based on electromagnetic induction.

Here, on the portable electronic device side, a separate reception antenna (for example, a reception coil (Rx coil)) corresponding to the planar coils 110a, 110b and 110c is provided. Accordingly, electric current is induced to the receiving coil side through the change of the magnetic field changing in the flat coil by the electromagnetic induction phenomenon, so that electric power is transmitted.

That is, the planar coils 110a, 110b, and 110c transmit a radio signal having an operating frequency in the range of 100 to 350kHz to the receiving coil side so that a current can be induced to the receiving coil side. Here, the planar coils 110a, 110b, and 110c may serve as transmission antennas that operate in the Qi mode or as transmission antennas that operate in the PMA mode.

The antenna unit may be a single plate type coil, but a plurality of plate type coils 110a, 110b, and 110c may be disposed on one surface of the magnetic plate 120 or 120 '. That is, as shown in FIG. 2, FIG. 6 and FIG. 7, any one of the three planar coils 110a, 110b, and 110c, which are provided by the three planar coils 110a, 110b, 110c may be arranged on the upper side of the remaining two flat plate type coils 110a and 110b and the other two flat plate type coils 110a and 110b may be arranged so that a part thereof overlaps with each other, Two flat plate coils 110a and 110b may be spaced apart from each other on one surface of the magnetic plate 120 or 120 '.

Hereinafter, for convenience of explanation, the two planar coils 110a and 110b disposed on the same plane will be referred to as a first coil 110a and a second coil 110b, respectively, and the first coil 110a and the second coil 110b, The flat coil 110c which is stacked so that a portion thereof overlaps with the two coils 110b will be referred to as a third coil 110c.

However, the present invention is not limited to such an arrangement and arrangement, and the upper and lower arrangement relationship of the first coil 110a, the second coil 110b and the third coil 110c and the total number of the plate- It can be changed.

The magnetic plates 120 and 120 'are made of a plate-shaped member having a predetermined area and are used to enhance the characteristics of the antenna by inducing a magnetic field generated during operation of the antenna units 110 and 210.

That is, the magnetic plate 120, 120 'shields the magnetic field generated when the antenna units 110 and 210 transmit a radio signal in a predetermined frequency band and focuses the magnetic field in a desired direction, .

The magnetic plates 120 and 120 'may be any as long as they include a magnetic body so as to shield the magnetic field generated by the antenna units 110 and 210. However, in order to prevent breakage even when vibration, The powder and the heat-resistant resin may be mixed at a predetermined ratio.

That is, the magnetic plate 120, 120 'may be formed of an injection molded product after mixing the magnetic powder and the heat resistant resin at a predetermined ratio.

In this case, the magnetic plates 120 and 120 'have a magnetic permeability in a range of 20 to 110 and a tan ㅿ (= μ' '/ μ') of 0.05 or less in an operating frequency band of 100 to 350 kHz in which the antenna units 110 and 210 operate, And a saturation magnetic flux density of 0.5 T or more (where μ 'is the permeability and μ is the investment loss rate).

In addition, the mixing ratio of the magnetic powder and the heat resistant resin constituting the magnetic plate 120, 120 'may be 70:30 to 95: 5 by weight.

This is because when the weight ratio of the magnetic powder is less than 70, the permeability is too small to satisfy the optimum efficiency required for wireless charging, and when the weight ratio of the magnetic powder is more than 95, the brittleness becomes strong and the injection is difficult.

Accordingly, the magnetic plate 120, 120 'according to the present invention can function as a shielding sheet for inducing a magnetic field through the magnetic powder, and the characteristics of the plastic of the heat resistant resin .

As a result, the characteristics of the materials constituting the magnetic plate 120 and 120 'are improved compared to the conventional Mn-Zn ferrite sheet used for inducing a magnetic field, The magnetic plate 120 or 120 'is not easily broken even if a shake or an impact occurs, so that the original characteristic value can be maintained.

Here, the magnetic powder may be any one of an Fe-Si-Al-based metal polymer and an Fe-Si-Cr-based metal polymer. The heat resistant resin may be an acrylic resin, a polyolefin resin, a polyamide resin, , A silicone resin, an epoxy resin, a polyurethane resin, a polyimide, a polyamideimide, a polyphenylsulfide, a polyesterimide, a polyester sulfone, a polysulfone, a polyetheretherketone, a polybenzimidazole, a polyarylate, , Polyacetal, and the like.

Guide portions 131, 132, 133 and 134 for preventing the flow of the planar coils 110a, 110b and 110c and increasing the magnetic field collection speed generated by the antenna units 110 and 210 are formed on one surface of the magnetic plate 120, 120 ' .

Accordingly, the magnetic plates 120 and 120 'have a relatively low permeability, for example, a permeability of 20 to 110 in the operating frequency band of 100 to 350 kHz in which the antenna units 110 and 210 operate, as compared with the Mn-Zn ferrite sheet It is possible to smoothly perform wireless charging by increasing the collection speed of the magnetic field through the guide portions 131, 132, 133, and 134.

To this end, the guide portion is disposed in a region corresponding to the hollow portion of the planar type coils 110a and 110b, and a first guide portion 131 for covering the outer edges of the planar type coils 110a and 110b in whole or in part. And second guide portions 132 and 132 '. In addition, when three flat-plate coils 110a, 110b, and 110c are provided, a part of the outer edges of the third coil 110c disposed on the upper side of the first coil 110a and the second coil 110b, And a fourth guide part 134 disposed at a central portion of the third coil 110c.

Here, the guide portions 131, 132, 133, and 134 may be formed as protrusions protruding at a predetermined height from one surface of the magnetic plate 120 or 120 ', or may be formed in a receiving recess formed in a predetermined depth from one surface of the magnetic plate 120 or 120' Or a combination of the protruding portion and the receiving recess may be provided.

As shown in FIG. 4, the first guide part 131 may be provided to entirely cover the outer edges of the flat type coils 110a, 110b, and 110c. However, as shown in FIG. 5, And may be provided in an open form so as to partially cover the outer edges of the flat type coils 110a and 110b.

The first guide part 131 and the second guide part 132 are formed to have a height approximately the same as the thickness of the planar type coils 110a, 110b and 110c, so that the planar type coils 110a and 110b So as to cover the outer edge and the inner edge.

That is, the first guide part 131 surrounding the outer edges of the first coil 110a and the second coil 110b may have a substantially same size as that of the first coil 110a and the second coil 110b And the second guide portion 132 surrounding the inner rim of the first coil 110a and the second coil 110b may be formed to have a thickness that is different from the thickness of the first coil 110a and the second coil 110b, And are provided to have approximately the same height.

Meanwhile, when the third coil 110c is stacked on the upper side of the first coil 110a and the second coil 110b, the second guide part 132 is connected to the first coil A first portion 132a having a height approximately the same as the sum of the thicknesses of the first coil 110a and the third coil 110c or the thicknesses of the second coil 110b and the third coil 110c; And a second portion 132b having a height approximately the same as the thickness of the first coil 110a or the second coil 110b in an area corresponding to the third coil 110c.

The fourth coil part 110c may include a fourth guide part 134c which is in contact with an inner edge of the third coil 110c, And the third guide portion 133 is disposed so as to partially contact the outer edge of the third coil 110c.

When the third coil 110c is stacked on the first coil 110a and the second coil 110b so as to overlap with the first coil 110a and the second coil 110b, A region of the third coil 110c which is not overlapped with the first coil 110a and the second coil 110b and is located on the center side of the first coil and the second coil is connected to the second portion 132b And is arranged so that the outer edge thereof is wrapped through the first portion 132a while the lower surface is touched.

A portion of the third coil 110c which does not overlap with the first coil 110a and the second coil 110b contacts a part of the inner rim through the fourth guide 134. [

The third coil 110c includes a second guide part 132 and a third guide part 133, which are disposed at a central portion of the first coil 110a and the second coil 110b, And a part of the inner rim is enclosed through the fourth guide part 134. [0052] As shown in FIG.

 Here, the guide units 131, 132, 133, and 134 may be formed of the same material as the magnetic plates 120 and 120 'and may be integrally formed with the magnetic plates 120 and 120'.

Accordingly, the first coil 110a and the second coil 110b are arranged such that the outer rim and the inner rim of the first coil 110a and the second coil 110b are in contact with each other through the first guide part 131 and the second guide part 132, 132 ' The outer edge of the coil 110c is wrapped around the second guide part 132 and the third guide part 133 and a part of the inner edge of the coil 110c is wrapped around the fourth guide part 134. [

The positions of the first coil 110a, the second coil 110b and the third coil 110c are fixed so that the flat coil 110a, 110b, The magnetic material plates 120 and 120 'can be made more flexible than the shielding sheets conventionally used and can be prevented from being broken by vibration and shaking, by preventing the magnetic material plates 120 and 120' from flowing, In addition, even if a material having a relatively low permeability is used, equivalent charging efficiency can be obtained.

For example, the magnetic plate 120 is formed of an injection molded article having a magnetic permeability of 70 using a Fe-Si-Al based metal polymer, which is a kind of metal powder, and three plate-like coils 110a, 110b, 110b and 110c and the shielding sheet made of Mn-Zn ferrite and having a permeability of 3000 are used in the case of including the guide portions 131, 132, 133 and 134 surrounding the outer and inner rims of the plate-shaped coils 110a, 110b and 110c, The characteristics of the three flat plate type coils are shown in Table 1 below.

Item The magnetic plate (including the guide portion) including the Fe-Si-Al system metal polymer, A shielding sheet made of Mn-Zn ferrite
(Flat plate structure) Coil position The first coil The second coil The third coil The first coil The second coil The third coil Inductance (H) 1.23E-05 1.22E-05 1.09E-05 1.18E-05 1.18E-05 1.11E-05 Rdc (Ohm) 0.049 0.049 0.049 0.049 0.049 0.049

As shown in Table 1, in both cases, it can be confirmed that the inductance of the third coil, which is the center coil, and the inductance of the first coil and the second coil, which are side coils, satisfy all of the conditions of inductance required by the Qi standard (In the case of the Qi standard, the inductance of the center coil should be in the range of 10.35 μH to 12.65 μH, and the inductance of the side coil should be in the range of 11.25 μH to 13.75 μH).

That is, the magnetic plate 120 according to the present invention has a magnetic permeability of 70, which is lower than that of the Mn-Zn ferrite having a permeability of 3,000, but satisfies both the inductance requirements required by the Qi standard and a relatively higher inductance .

In addition, in the case where Mn-Zn ferrite having a permeability of 3000 is used as the shielding sheet provided in the wireless charging transmission module and the permeability of the shielding sheet provided in the wireless charging and receiving module is 750, the coupling coefficient between the receiving coil and the transmitting coils, When the magnetic permeability of the shielding sheet provided on the charge receiving module side is 750 and the Fe-Si-Al based metal polymer is used as the magnetic shielding sheet for the wireless charging transmission module and the magnetic permeability is 70, The coupling coefficients between the transmission coils are shown in Table 2 below.

Here, the magnetic plate 120 includes guide portions 131, 132, 133, and 134 that surround the outer and inner rims of the plate-type coil.

Item The magnetic plate (including the guide part) including the Fe-Si-Al system metal polymer, A shielding sheet made of Mn-Zn ferrite
(Flat plate structure) Coil position The first coil The second coil The third coil The first coil The second coil The third coil Coupling coefficient 71.8% 71.7% 74.5% 69.0% 69.1% 73.3%

Further, in the case where Mn-Zn ferrite having a permeability of 3000 is used as the shielding sheet provided in the wireless charging transmission module and the shielding sheet provided on the side of the wireless charging and receiving module is 750, the coupling coefficient between the receiving coil and the transmitting coil, When the magnetic permeability of the shielding sheet provided on the charge receiving module side is 750 and the shielding sheet provided in the wireless charging transmission module uses an Fe-Si-Cr based metal polymer as the magnetic powder and an injection molded article having a permeability of 35 is used, The coupling coefficients between the transmission coils are shown in Table 3 below.

Here, the magnetic plate 120 includes guide portions 131, 132, 133, and 134 that surround the outer and inner rims of the plate-type coil.

Item A magnetic plate (including a guide part) including an Fe-Si-Cr based metal polymer, A shielding sheet made of Mn-Zn ferrite
(Flat plate structure) Coil position The first coil The second coil The third coil The first coil The second coil The third coil Coupling coefficient 69.4% 69.3% 72.7% 69.0% 69.1% 73.3%

As can be seen from the above Tables 2 and 3, the magnetic plates 120 and 120 'according to the present invention have a lower magnetic permeability of 70 (or even 35) than that of the Mn-Zn ferrite having a permeability of 3000, It can be seen that the coupling coefficient is equal or rather higher than that of Mn-Zn ferrite having a permeability of 3000. This means that the charging efficiency is higher.

Consequently, the magnetic plate according to the present invention is made of an injection molded article in which a magnetic powder and a heat-resistant resin are mixed at a proper ratio compared to the conventional art, so that even if the magnetic permeability is low, the magnetic field collection speed at the side of the plate type coils is further increased It is possible to obtain an equal or rather superior charging efficiency as compared with the Mn-Zn ferrite having a high permeability.

In addition, since the magnetic plate is formed of an injection molded body in which a magnetic powder and a heat resistant resin are mixed together, the magnetic plate has a very strong characteristic against vibrations and shocks generated during running of the vehicle.

The magnetic plates 120 and 120 'according to the present invention extend outward from the central portions of the planar coils 110a and 110b among the pair of connection terminals 112a and 112b provided in the planar coils 110a and 110b. A mounting groove 122 for receiving the connection terminal 112b may be provided.

The seating grooves 122 are formed to have a height approximately the same as the diameter of the conductive members constituting the flat type coils 110a and 110b to fix the flat type coils 110a and 110b and the magnetic plate 120 and 120 ' The lower surfaces of the flat type coils 110a and 110b are completely interfaced with the magnetic plate 120 and 120 'by receiving the connection terminals 112b extending outward from the center of the flat type coils 110a and 110b .

The cover members 140, 240, and 340 are for preventing the flat type coils 110a, 110b, and 110c disposed on one surface of the magnetic plate 120 or 120 'during running of the vehicle from moving or shaking. That is, the cover members 140, 240, and 340 are formed such that one surface of the cover members 140a, 140b, and 140c corresponding to the planar coils 110a, 110b, and 110c is in contact with the planar coils 110a, 110b, Is separated from the magnetic plate 120 or 120 'or prevents the flat coil 110a, 110b or 110c from shaking or flowing on one surface of the magnetic plate 120 or 120'.

Accordingly, when wireless charging is performed by fixing the positions of the flat type coils 110a, 110b, and 110c disposed on one surface of the magnetic plate 120 or 120 'during traveling of the vehicle, State can be maintained.

Here, the cover members 140, 240 and 340 may be made of a non-conductive material so as not to deteriorate the performance of the flat type coils 110a, 110b and 110c serving as antennas, and the cover members 140, May be made of a material similar in shrinkage and expansion to the magnetic plate 120, 120 'so as to prevent separation from the magnetic plate 120, 120' due to shrinkage and expansion.

2 and 9, the cover member 140 covers one surface of the magnetic plate 120, 120 'including the planar coils 110a, 110b, 110c, And a molding through epoxy molding to absorb vibration.

6, the cover member 240 is made of a rigid material, for example, a plastic material, and the inner surface of the cover member 240 corresponding to the planar coils 110a, 110b, and 110c At least one protrusion 242 may be provided. Here, the sides of the magnetic plate 120, 120 'may be surrounded by an extension 244 extending from the rim of the cover member 240.

In this case, the protruding portion 242 is provided to have the same height as the thickness of the third coil 110c when three flat-type coils 110a, 110b, and 110c are provided. The first coil 110a and the second coil 110b are disposed in a lower position relative to the outer surface of the cover member 240 so that one surface of the protrusion 242 is in contact with one surface of the second coil 110b, 110a and the second coil 110b and the third coil 110c is directly in contact with the inner surface of the cover member 240 so that the third coil 110c is also covered by the cover member 240 To prevent flow and shaking.

7 and 8, the cover member 340 is made of a rigid material, for example, a plastic material, and the cover member 340 is disposed between the cover member 340 and the flat plate type coils 110a, 110b, and 110c The cover member 340 may be provided with a cushioning member 150 having one side thereof in close contact with the flat coils 110a, 110b and 110c. Here, the sides of the magnetic plate 120, 120 'may be surrounded by an extension 344 extending from the rim of the cover member 340.

At this time, the buffer member 150 may be made of a sponge, a styrofoam, or a rubber material so as to absorb vibrations and vibration generated when the vehicle is traveling. However, the material of the cushioning member 150 is not limited thereto, and any material capable of absorbing impact and vibration can be used.

The buffer member 150 may include at least one protrusion 152 on the inner surface corresponding to the flat coil 110a, 110b or 110c. Here, the protrusions 152 are provided to have the same height as the thickness of the third coil 110c when the three flat-type coils 110a, 110b, and 110c are provided.

The first coil 110a and the second coil 110b are disposed in a lower position relative to the outer surface of the cover member 340 so that the first coil 110a and the second coil 110b, The third coil 110c is prevented from flowing and shaking the first coil 110a and the second coil 110b and the third coil 110c is also directly contacted with one surface of the buffer member 150, To prevent flow and shaking.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 200, 300, 400: wireless charging transmission module 110, 210: antenna unit
110a, 110b, 110c: flat plate type coils 112a, 112b: connection terminals
120, 120 ': magnetic plate 122:
131: first guide part 132, 132 ': second guide part
132a: first part 132b: second part
133: third guide part 134: fourth guide part
140, 240, 340: cover member 242:
244, 344: extension part 150: buffer member
152: protrusion

Claims (12)

An antenna unit comprising at least one plate type coil;
A magnetic plate disposed on one surface of the antenna unit so as to shield a magnetic field generated by the antenna unit and focus the same in a desired direction; And
And a cover member for preventing vibration and shaking of the flat coil. The method according to claim 1,
Wherein the magnetic plate has a magnetic permeability of 20 to 110 in an operating frequency band in the range of 100 to 350 kHz in which the antenna unit is operated, a saturation magnetic flux density of 0.5 T or more, Tan ㅿ (= Wireless charging transmitter module.
(Where μ 'is the permeability and μ' is the investment loss rate). The method according to claim 1,
Wherein the magnetic plate has a guide formed on one surface of the magnetic plate to prevent the plate-type coil from flowing and to increase the magnetic field collection speed. The method of claim 3,
Wherein the guide portion includes a first guide portion provided to cover the entire outer edge of the flat coil, and a second guide portion disposed in a region corresponding to the hollow portion of the flat coil. 5. The method of claim 4,
Wherein the magnetic plate is provided with a receiving recess formed in a region corresponding to the flat coil and having a predetermined depth recessed therein, the first guide portion is an inner circumferential surface defining the receiving groove, and the second guide portion corresponds to the hollow portion And a protruding portion protruding from the bottom surface of the receiving groove at a predetermined height. The method according to claim 1,
Wherein the magnetic plate is injection-molded by mixing a magnetic powder and a heat-resistant resin. The method according to claim 6,
Wherein the magnetic powder and the heat-resistant resin have a weight ratio of 70:30 to 95: 5. The method according to claim 6,
Wherein the magnetic powder is an Fe-Si-Al-based metal polymer or an Fe-Si-Cr-based metal polymer. The method according to claim 1,
Wherein the cover member is formed through epoxy molding so as to cover one surface of the magnetic plate including the planar coil. The method according to claim 1,
One of the flat type coils is disposed on the upper side of the other two flat type coils, and the other two flat type coils are arranged so that a part thereof overlaps with the other two type flat type coils Wireless charging transmission module for vehicle. 11. The method of claim 10,
Wherein the cover member is made of a rigid material and at least one protrusion is formed on the inner surface of the cover member corresponding to the flat coil so that each flat coil is in close contact with the inner surface of the cover member, . The method according to claim 1,
Wherein the cover member is made of a rigid material, and a buffer member is disposed between the inner surface of the cover member and the flat coil.

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