KR20210157044A - wireless power transmission module - Google Patents

Abstract

A wireless power transmission module is provided. A wireless power transmission module according to an exemplary embodiment of the present invention includes: a first coil for wirelessly charging a battery of a first electronic device; a second coil having a size relatively smaller than that of the first coil, stacked on one surface of the first coil, and wirelessly charging a battery of a second electronic device; and a shielding member for shielding a magnetic field generated from the first coil and the second coil, wherein a conductive member having a predetermined length is wound in one direction in each of the first coil and the second coil to form a coil body It is a flat coil, and the conductive member may be composed of a plurality of wires having a predetermined wire diameter.

Description

Wireless power transmission module

The present invention relates to a wireless power transmission module.

Wireless power transmission technology does not require a separate wired cable for charging, so the user's convenience is good. Accordingly, wireless power transmission technology is widely used as a method for charging a battery in various electronic devices.

However, battery charging using wireless power transmission can satisfy the required charging efficiency only when the wireless power transmitting module and the wireless power receiving module are aligned with each other.

That is, good charging efficiency can be obtained when the transmitting antenna included in the wireless power transmitting module and the receiving antenna included in the wireless power receiving module coincide with each other.

However, an electronic device in which a battery is charged through wireless power transmission has different sizes of a transmitting antenna and a receiving antenna depending on the type of device. Accordingly, in order to obtain good charging efficiency, a dedicated wireless charger suitable for each electronic device is required.

For this reason, since a dedicated wireless charger suitable for each electronic device is required to charge the batteries of electronic devices having different sizes, there is a hassle in use.

KR 10-1325551 B1

The present invention has been devised in consideration of the above points, and an object of the present invention is to provide a wireless power transmission module capable of universally charging batteries of different types of electronic devices and implementing good charging efficiency.

In order to achieve the above object, the present invention provides a first coil for wirelessly charging a battery of a first electronic device; a second coil having a size relatively smaller than that of the first coil, stacked on one surface of the first coil, and wirelessly charging a battery of a second electronic device; and a shielding member for shielding the magnetic field generated by the first coil and the second coil, wherein a conductive member having a predetermined length is wound in one direction in each of the first coil and the second coil to form a coil body It is a flat coil, and the conductive member provides a wireless power transmission module that is composed of a plurality of wires having a predetermined wire diameter.

In addition, the first coil may be a flat plate coil having a coil body having a hollow portion formed in a central portion and a first width, and the second coil may be a second coil having a hollow portion formed in the center portion and relatively narrower than the first width. It may be a flat coil formed as a coil body having two widths, and the second coil may be disposed such that a width of a portion of the coil body is located in a hollow portion of the first coil.

In this case, the center point of the first coil and the center point of the second coil may be arranged to coincide with each other.

Also, the first coil may be in direct contact with one surface of the shielding member, and the second coil may be spaced apart from one surface of the shielding member by a thickness of the first coil.

In addition, the plurality of wires may be insulated through a coating material having an insulating surface.

In addition, each conductive member constituting the coil body of the first coil and the coil body of the second coil may form one turn by grouping a plurality of wires into one. In this case, the plurality of wires constituting one turn of the conductive member may be disposed along a direction parallel to one surface of the shielding member.

In addition, the shielding member may include any one of a polymer, ferrite, and an amorphous ribbon.

Also, the first coil may be a Qi standard A11 coil.

Also, the first electronic device may be a mobile device, and the second electronic device may be a smart watch.

In addition, the wireless power transmission module may be built into the trackpad.

According to the present invention, it is possible to realize good charging efficiency while being able to charge batteries of different types of electronic devices in general.

1 is a state diagram of charging a first electronic device using a wireless power transmission module according to an embodiment of the present invention;
2 is a state diagram of charging a second electronic device using a wireless power transmission module according to an embodiment of the present invention;
3 is a view showing a wireless power transmission module according to an embodiment of the present invention;
Figure 4 is an exploded view of Figure 3;
5 is a cross-sectional view of FIG. 3;
6 is an exemplary view showing a case in which the wireless power transmission module according to an embodiment of the present invention is implemented as a wireless charger, and,
7 is a diagram illustrating a case in which the wireless power transmission module according to an embodiment of the present invention is applied to a trackpad of a notebook computer.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. 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.

When the wireless power transmission module 100 according to an embodiment of the present invention, as shown in FIGS. 1 and 2 , the electronic devices 10 and 20, which are charging objects in which the wireless power reception module is embedded, are disposed on the upper side The battery included in the electronic devices 10 and 20 may be wirelessly charged through interaction with the wireless power receiving module.

At this time, the wireless power transmission module 100 according to an embodiment of the present invention can charge all batteries of different types of electronic devices having different sizes, and any one of the different types of electronic devices constitutes a wireless power receiving module. The receiving antenna may be a Qi standard A11 standard antenna.

For example, any one of the different types of electronic devices 10 and 20 may be a first electronic device 10 in which a battery is wirelessly charged by receiving wireless power through a reception antenna of the Qi standard A11 standard, and , the other electronic device may be the second electronic device 20 in which a battery is wirelessly charged by receiving wireless power through a reception antenna having a relatively smaller size than a reception antenna of the Qi standard A11 standard.

As a non-limiting example, the first electronic device 10 may be a mobile electronic device having a built-in reception antenna of Qi standard A11 standard, such as a smart phone, and the second electronic device 20 is a smart watch. The wearable device may be a wearable device having a smaller size than the receiving antenna of the Qi standard A11 standard.

In the present invention, different types of electronic devices having different sizes may be electronic devices having different sizes and types, such as wearable devices or mobile devices, and the sizes of the receiving antennas of the wireless power receiving modules built in each electronic device are different from each other. It may be a different electronic device. In addition, different types of electronic devices may include electronic devices having different sizes of antennas for reception of a wireless power receiving module built in each electronic device, even if they are the same type of electronic device.

To this end, the wireless power transmission module 100 according to an embodiment of the present invention includes a first coil 111 , a second coil 112 and a shielding member 120 as shown in FIGS. 3 to 5 . do.

Each of the first coil 111 and the second coil 112 may transmit power wirelessly using a predetermined frequency band when power is supplied. That is, each of the first coil 111 and the second coil 112 may serve as an antenna for wireless power transmission for wireless power transmission.

In this case, the first coil 111 may serve as an antenna for charging the battery of the first electronic device 10 , and the second coil 112 is the second electronic device 20 . It may serve as an antenna for charging the battery.

In addition, the first coil 111 may be a Qi standard A11 coil, and the second coil 112 may be a coil having a relatively smaller size than the Qi standard A11 coil.

Each of the first coil 111 and the second coil 112 is a flat plate in which a conductive member B having a predetermined length is wound a plurality of times in a clockwise or counterclockwise direction to form the coil bodies 111a and 112a. It may be a type coil, and each of the coil bodies 111a and 112a may have hollow portions 111b and 112b including center points O1 and O2 in the central portion thereof, respectively.

At this time, each of the first coil 111 and the second coil 112 may have different sizes of the coil bodies 111a and 112a, and the coil body 112a of the second coil 112 is It may have a relatively smaller size than the coil body 111a of the first coil 111 .

For example, as shown in FIG. 5 , the coil body 111a of the first coil 111 may have a size of the first width W1 , and the coil body 112a of the second coil 112 . may have a second width W2 that is relatively narrower than the first width W1.

In this case, a first coil 111 having a relatively large size may be stacked on one surface of the shielding member 120 , and a second coil 112 having a relatively small size may be formed of the first coil 111 . It may be laminated on the top surface.

Accordingly, one surface of the first coil 111 may be in direct contact with one surface of the shielding member 120 , and the second coil 112 may be in direct contact with the shielding member 120 by the thickness of the first coil 111 . 120) may be spaced apart from one surface.

In this case, the second coil 112 has the first coil 111 so that the width of a portion of the coil body 112a including the hollow portion 112b is located within the hollow portion 111b of the first coil 111 . ) can be laminated on one side of the

That is, the second coil 112 has a partial width including the hollow part 112b of the coil body 112a located in the hollow part 111b of the first coil 111, so that the shielding member A portion corresponding to the remaining width except for a portion located in the hollow portion 111b of the first coil 111 among the coil body 112a of the second coil 112, which can face the one surface of 120 may overlap the coil body 111a of the first coil 111 .

In addition, the second coil 112 is the first coil 111 such that the center point O2 of the coil body 112a coincides with the center point O1 of the coil body 111a constituting the first coil 111 . ) can be laminated on one side of the

In this case, the first coil 111 and the second coil 112 may be connected in parallel with a circuit unit (eg, a circuit board) for controlling overall driving, and through the control of the circuit unit, the first coil ( 111) and any one of the second coil 112 may be selectively operated.

Through this, in the wireless power transmission module 100 according to an embodiment of the present invention, the first coil 111 of the two coils 111 and 112 for charging the batteries of different types of electronic devices is of the Qi standard A11 standard. The second coil 112 having a size relatively smaller than the size of the Qi standard A11 standard while maintaining the size may be disposed to overlap only a portion corresponding to a partial width of the entire width of the first coil 111, The center point O1 of the first coil 111 and the center point O2 of the second coil 112 may be arranged to coincide with each other.

Accordingly, in the wireless power transmission module 100 according to an embodiment of the present invention, selective wireless charging using the first coil 111 and the second coil 112 can be performed, so that the coil of the Qi standard A11 standard It is possible to charge the batteries of different types of electronic devices while solving the authentication problem.

In addition, the wireless power transmission module 100 according to an embodiment of the present invention is arranged so that the center points O1 and O2 of the first coil 111 and the second coil 112 coincide with each other, so that different types of Even if the first electronic device 10 and the second electronic device 20 are placed in the same position, the antenna for receiving wireless power included in the first electronic device 10 and the second electronic device 20 of different types, respectively, is described above. One of the first coil 111 and the second coil 112 may be placed in an alignment state in which the center point coincides with one of the coils.

Through this, the wireless charging of each of the first electronic device 10 and the second electronic device 20 of different types can satisfy the charging efficiency.

For this reason, the different types of electronic devices 10 and 20 can charge each battery using the wireless power transmitted through the first coil 111 or the second coil 112 even if a dedicated charger is not used. In addition, the convenience of use can be improved by being able to always arrange the electronic devices 10 and 20 at the same position regardless of the type of the electronic devices 10 and 20 .

At this time, in the wireless power transmission module 100 according to an embodiment of the present invention, a conductive member forming the coil body 111a of the first coil 111 and the coil body 112a of the second coil 112 ( B) may be composed of a plurality of wires (A) having a predetermined wire diameter, and the plurality of wires (A) may be insulated with a coating material having an insulating surface.

That is, as shown in the enlarged views of FIGS. 4 and 5 , the conductive member B constituting the coil bodies 111a and 112a of the first coil 111 and the second coil 112 includes a plurality of wires ( A) may be grouped into one to constitute one turn, and a plurality of wires (A) grouped into one may be connected in parallel with the circuit unit, and a wire (A) constituting the coil body 111a of the first coil 111 ) and the wire diameter of the wire A constituting the coil body 112a of the second coil 112 may have the same size.

Through this, in the wireless power transmission module 100 according to an embodiment of the present invention, a plurality of wires (A) having a relatively small wire diameter constitute one turn of the coil body (111a, 112a), thereby reducing the resistance flowing in the coil itself. can be reduced

Accordingly, the problem of heat generated during wireless charging can be improved, and the required charging efficiency can be satisfied. In particular, it is possible to increase the charging efficiency of the first electronic device 10 such as a mobile phone by increasing the charging efficiency of the first coil 111, which is the Qi standard A11 standard.

In addition, a plurality of wires (A) constituting one turn of the coil body (111a, 112a) may be arranged in parallel along one surface of the shielding member (120).

Accordingly, in the wireless power transmission module 100 according to an embodiment of the present invention, the thickness of the coil body 111a constituting the first coil 111 and the coil body constituting the second coil 112 ( The thickness of 112a) may be the same size as the thickness of each wire (A).

For this reason, the wireless power transmission module 100 according to an embodiment of the present invention includes the first coil 111 and the second coil 112 to charge the batteries of the different types of electronic devices 10 and 20 . Even if they are stacked on each other, the total thickness including the thicknesses of the first coil 111 and the second coil 112 may be equal to twice the thickness of the wire (A).

Through this, the wireless power transmission module 100 according to an embodiment of the present invention can be thinned by reducing the overall thickness while improving the heat problem by reducing the resistance flowing through the coil itself and increasing the charging efficiency.

The shielding member 120 shields the magnetic field generated by the first coil 111 and the second coil 112 and increases the collection speed of the magnetic field in a required direction, thereby operating in a predetermined frequency band. The performance of the coil 111 and the second coil 112 may be improved.

To this end, the shielding member 120 may be disposed on one surface of the first coil 111 and the second coil 112 and may be made of a magnetic material.

For example, the shielding member 120 may be an amorphous ribbon, ferrite, or polymer. Here, the amorphous ribbon may be an amorphous ribbon including at least one of an amorphous alloy and a nanocrystalline alloy, and the amorphous alloy may be an Fe-based or Co-based magnetic alloy, and the ferrite sheet is Mn—Zn ferrite. or sintered ferrite such as Ni—Zn ferrite.

In addition, the shielding member 120 may be flake-treated to increase overall resistance to suppress the occurrence of eddy currents or to increase flexibility to be formed separately into a plurality of fine pieces, and the plurality of fine pieces may be amorphous.

In addition, the shielding member 120 may be a multilayer sheet in which a plurality of magnetic sheets are stacked in multiple layers via an adhesive layer, or a hybrid sheet in which different types of magnetic sheets are stacked. In addition, each of the plurality of magnetic sheets may be a sheet separated into a plurality of fine pieces by flake treatment, and the fine pieces adjacent to each other may be entirely insulated or partially insulated.

It should be noted that, for the shielding member 120 such as this, any known material commonly used in order to increase the wireless power transmission efficiency may be used.

Meanwhile, the aforementioned wireless power transmission module 100 may be implemented as a separate wireless charger.

As an example, the wireless power transmission module 100 includes a case 140 for accommodating the first coil 111, the second coil 112 and the shielding member 120 therein as shown in FIG. 6; It may further include a circuit unit 130 built into the case 140 .

Specifically, the case 140 prevents the first coil 111, the second coil 112, and the shielding member 120 from being exposed to the outside, and the first coil 111 and the second coil from external force. It is possible to protect the 112 and the shielding member 120 .

To this end, the case 140 may be formed in the shape of a housing having an inner space.

As a specific example, the case 140 may include a first case 142 with an open top and a second case 141 covering the open top of the first case 142 .

Here, the second case 141 may have one surface exposed to the outside as a horizontal surface, and the horizontal surface is a seating surface on which the first electronic device 10 and the second electronic device 20, which are charging objects, are placed. can

In addition, the circuit unit 130 may control the overall driving of the wireless charger, and the MCU may be mounted on one surface of the circuit board. Such a circuit unit 130 may be accommodated in the first case 142 to be located on the lower surface of the shielding member 120 .

Through this, the wireless power transmission module 100 according to an embodiment of the present invention may be implemented as a wireless charger capable of charging batteries of different types of electronic devices 10 and 20, respectively.

As another example, the wireless power transmission module 100 may be embedded in a known trackpad 40 . For example, the trackpad 40 may be a trackpad provided in the notebook 30 as shown in FIG. 7 .

In this case, the wireless power transmission module 100 may be embedded to be located on the lower side of the trackpad 40 , and the first electronic device 10 or the second electronic device on the trackpad 40 side. When 20 is placed, the battery of the first electronic device 10 or the second electronic device 20 through the selective operation of any one of the first coil 111 and the second coil 112 as described above can be charged individually.

However, the application target of the wireless power transmission module 100 according to an embodiment of the present invention is not limited thereto, and it may be applied to various electronic devices for implementing a wireless charging function.

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: wireless power transmission module 111: first coil
111a: coil body 111b: hollow part
112: second coil 112a: coil body
112b: hollow part 120: shielding member

Claims (10)

a first coil for wirelessly charging the battery of the first electronic device;
a second coil having a size relatively smaller than that of the first coil, stacked on one surface of the first coil, and wirelessly charging a battery of a second electronic device; and
Including; a shielding member for shielding the magnetic field generated in the first coil and the second coil;
Each of the first coil and the second coil is a flat plate coil in which a conductive member having a predetermined length is wound in one direction to form a coil body, and the conductive member is a wireless power comprising a plurality of wires having a predetermined wire diameter sending module. The method of claim 1,
The first coil is a flat coil formed in a coil body having a hollow portion formed in the center portion and having a first width,
The second coil is a flat coil formed in a coil body having a hollow portion formed in the central portion and having a second width that is relatively narrower than the first width,
The second coil is a wireless power transmission module disposed so that a width of a part of the coil body is located in the hollow portion of the first coil. The method of claim 1,
The central point of the first coil and the central point of the second coil are wireless power transmission module arranged to coincide with each other. The method of claim 1,
The first coil is in direct contact with one surface of the shielding member, and the second coil is a wireless power transmission module spaced apart from one surface of the shielding member by a thickness of the first coil. The method of claim 1,
The plurality of wires is a wireless power transmission module whose surface is insulated through a coating material having insulating properties. The method of claim 1,
Each conductive member constituting each of the coil body of the first coil and the coil body of the second coil constitutes one turn by grouping a plurality of wires into one,
A plurality of wires constituting one turn of the conductive member are wireless power transmission module disposed in parallel along one surface of the shielding member. The method of claim 1,
The shielding member is a wireless power transmission module comprising any one of a polymer, ferrite, amorphous ribbon material. The method of claim 1,
The first coil is a Qi standard A11 coil wireless power transmission module. The method of claim 1,
The first electronic device is a mobile device, and the second electronic device is a smart watch. The method of claim 1,
The wireless power transmission module is a wireless power transmission module built into the trackpad.

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