KR102137037B1 - Apparatus for wireless charging using multi-coil and repeater - Google Patents

Abstract

The present invention relates to a wireless charging device in which multiple coils and repeaters overlap each other. According to an embodiment of the present invention, the wireless charging device comprises: first and second coils disposed to be spaced apart on a flat core; a third coil disposed on the first and second coils to form an overlapping region with the first and second coils; and at least one repeater disposed on the third coil so that an interlinkage face overlaps the overlapping region.

Description

Wireless charging device using multiple coils and repeaters{APPARATUS FOR WIRELESS CHARGING USING MULTI-COIL AND REPEATER}

The present invention relates to a wireless charging device in which multiple coils and repeaters are overlapped.

In general, a battery is a device that receives and stores power from an external charger and supplies the stored power as a power source for the operation of the electronic device.

As one of the methods for charging such a battery, there is a terminal supply method that receives commercial power, converts it into a voltage and current suitable for the battery, and supplies power to the battery through a charging terminal.

However, such a terminal supply method may cause problems such as instantaneous discharge, spark, and fire due to a potential difference between a charging terminal of a battery and a power supply terminal of commercial power. Accordingly, a wireless charging method using wireless power transmission has recently been proposed.

The wireless charging method is performed by a contactless power transmission device and a contactless power reception device, and power is transferred from a contactless power transmission device to a contactless power reception device through electromagnetic induction between the two devices.

However, according to the wireless charging method, one contactless power transmission device can supply power only to a single contactless power reception device, and the contactless power reception device is specified on the contactless power transmission device for magnetic coupling between the two devices. Since it has to be placed in a position, it is a contactless method, but has a disadvantage that the physical range that can be charged is very narrow.

In order to solve the latter problem, a technique for extending a chargeable range, such as prior art (registration patent 10-0976163), has been proposed.

In the prior art, in order to stably supply power even when the contactless power receiving device partially moves on the contactless power transmission device, the primary core provided in the contactless power transmission device is composed of two different cores, and the two cores It is characterized in that it is formed in a multi-layer structure so that a part of each other overlap.

However, according to the above-described prior art, not only is the power transmission efficiency lowered due to magnetic field interference due to the overlap of the core, but even according to the prior art, one contactless power transmission device simultaneously applies power to a plurality of contactless power reception devices. There are limits that cannot be supplied.

An object of the present invention is to provide a wireless charging device that performs a wireless charging operation using a plurality of coils superimposed on a flat core.

In addition, an object of the present invention is to provide a wireless charging device that performs a wireless charging operation by placing a repeater on a plurality of coils that are superimposed.

In addition, an object of the present invention is to provide a wireless charging device that performs a wireless charging operation by placing a plurality of coils superimposed on two separate flat cores.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

The present invention includes first and second coils spaced apart on the flat plate core, and third coils disposed on the first and second coils to form overlapping regions therewith, thereby forming a plurality of overlapping layers on the flat plate core. A wireless charging operation may be performed using a coil.

In addition, according to the present invention, by including a repeater arranged such that the cross-linked surface overlaps with an overlapped region formed by a plurality of coils, it is possible to perform a wireless charging operation by arranging a repeater on the plurality of coils arranged in the overlap.

In addition, the present invention includes first and second flat cores spaced apart from each other, first and second coils provided on each flat core, and third coils provided on first and second coils, A wireless charging operation may be performed by arranging a plurality of coils on two separate flat cores.

The present invention has an effect of performing a power transmission operation in a wide area regardless of the location of a user terminal mounted on a wireless charging device by performing a wireless charging operation using a plurality of coils superimposed on a flat core. .

In addition, the present invention has an effect of preventing a decrease in efficiency of power transmission that may occur due to overlapping of transmission coils by arranging repeaters on a plurality of coils that are overlapped to perform a wireless charging operation.

In addition, according to the present invention, by performing a wireless charging operation by arranging a plurality of coils superposed on two separate flat cores, it is possible to prevent a magnetic field generated on one core from interfering with another core, and accordingly a plurality of user terminals It has the effect of charging at the same time.

In addition to the above-described effects, the concrete effects of the present invention will be described together while describing the specific matters for carrying out the invention.

1 is a view showing a wireless charging device according to an embodiment of the present invention.
2 and 3 are views each showing a state in which the first to third coils shown in FIG. 1 are disposed on a single flat core and a separate flat core.
4 is a view showing a state in which the first to third coils having the same shape and size are disposed on a separated flat core.
5 to 9 are views showing each example of the repeater disposed on the third coil.
10 is a view showing the shapes of the first to third coils for each region.
11 and 12 are views each showing a state in which the inner edge of the repeater includes overlapping regions between the first and third coils.
13 is a view showing a state in which the area surrounded by the inner edge of the repeater coincides with the overlapping area between the first and third coils.
14 is a view showing a wireless charging system according to an embodiment of the present invention.
15 is a view showing a control flow of the wireless charging system shown in FIG. 14;
16 is a view for explaining a method of supplying power to each user terminal when a plurality of user terminals are located on a wireless charging device.

The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, and accordingly, a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. In the description of the present invention, when it is determined that detailed descriptions of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, detailed descriptions will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

In the following, the arrangement of any component in the "upper (or lower)" of the component or the "upper (or lower)" of the component means that any component is disposed in contact with the upper surface (or lower surface) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected to or connected to each other, but other components may be "interposed" between each component. It should be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

The present invention relates to a wireless charging device in which multiple coils and repeaters are overlapped.

First, referring to FIGS. 1 to 13, a wireless charging device according to an embodiment of the present invention will be described in detail.

1 is a view showing a wireless charging device according to an embodiment of the present invention. 2 and 3 are views each showing a state in which the first to third coils illustrated in FIG. 1 are disposed on a single flat core and a separate flat core.

4 is a view showing a state in which the first to third coils having the same shape and size are disposed on a separated flat core.

5 to 9 are views showing each example of the repeater disposed on the third coil.

10 is a view showing shapes of the first to third coils for each region.

11 and 12 are views each showing a state in which the inner edge of the repeater includes overlapping regions between the first and third coils. In addition, FIG. 13 is a view showing how the region surrounded by the inner edge of the repeater coincides with the overlapping region between the first and third coils.

Referring to FIG. 1, the wireless charging device 100 may include a top case 10u and a bottom case 10d as external structures, and an inner space formed by the top case 10u and the bottom case 10d. The substrate 10s, the flat core 110 provided on the substrate 10s, and the first to third coils 120, 130, and 140 disposed on the flat core 110 may be provided.

A control unit 160 that applies current to a plurality of coils using an external power source may be mounted on the substrate 10s, and a control line connecting the control unit 160 to each coil may be provided. To this end, the substrate 10s may be implemented as a printed circuit board (PCB), an integrated circuit (IC), or the like.

Hereinafter, the flat core 110 and the first to third coils 120, 130, and 140 disposed on the flat core 110 will be described with reference to FIGS. 1 to 4. Meanwhile, the x-axis, y-axis, and z-axis directions described below may be directions defined by the coordinate axes illustrated in FIG. 1.

The flat core 110 has a high permeability and can be implemented with a material that is not easily broken. More specifically, the flat core 110 may be made of amorphous metal materials such as cobalt (Co), iron (Fe), nickel (Ni), boron (B), silicon (Si), and combinations thereof, and sheet Or it may have a thin film form. For example, in the present invention, the flat core 110 may be a ferrite core.

Accordingly, the flat core 110 can increase the magnetic flux density of the magnetic fields generated by the first to third coils 120, 130, and 140, and efficiently form the magnetic path of the magnetic field.

Meanwhile, the first to third coils 120, 130, and 140 are flat coils provided on the flat core 110 and may be wound clockwise or counterclockwise. Connection terminals may be provided at both ends of the first to third coils 120, 130, and 140 for electrical connection with the aforementioned control unit 160. Accordingly, the control unit 160 may apply a current to the first to third coils 120, 130, and 140 through a connection terminal, and a magnetic field may be generated in the first to third coils 120, 130, 140. Can. Meanwhile, the first to third coils 120, 130, and 140 may have various shapes according to design needs.

The first and second coils 120 and 130 may be spaced apart on the flat core 110, and the third coil 140 may overlap the first and second coils 120 and 130 and the overlapped area RA. It may be disposed on the first and second coils 120 and 130 to form.

Referring to FIG. 2 in one example, the first and second coils 120 and 130 may be arranged to be spaced apart from each other on a single flat core 110. At this time, the third coil 140 may be disposed on the first and second coils 120 and 130 so as to overlap with the first and second coils 120 and 130, respectively. In other words, when viewed in the z-axis direction, the third coil 140 may be partially overlapped with the first coil 120 and partially overlapped with the second coil 130.

Referring to FIG. 3 in another example, the flat plate core 110 may include first and second flat plate cores 110a and 110b spaced apart from each other, and the first and second coils 120 and 130 may include It can be spaced apart from each other by being disposed on the first and second flat plate cores 110a and 110b, respectively. At this time, the third coil 140 may be disposed on the first and second coils 120 and 130 so as to overlap with the first and second coils 120 and 130, respectively.

The first and second coils 120 and 130 may be disposed in an area formed by the flat core 110. The area formed by the flat plate core 110 may be an area surrounded by each edge of the flat plate core 110 when viewed in the z-axis direction.

As shown in FIG. 3, when the flat core 110 is composed of the first and second flat cores 110a and 110b, the first coil 120 is disposed in an area formed by the first flat core 110a. The second coil 130 may be disposed in an area formed by the second flat plate core 110b.

Meanwhile, the third coil 140 may be disposed on the first and second coils 120 and 130 in any form overlapping with the first coil 120 and the second coil 130, respectively. However, when the user terminal 200 is mounted on the top case 10u of the wireless charging device 100, the third coil 140 is used to uniformly transmit power regardless of the location of the user terminal 200. It may be disposed in the center of the first and second coils (120, 130).

To this end, as shown in FIG. 3, the third coil 140 has a distance between the center of the third coil 140 and the center of the first coil 120 and the center of the third coil 140. It may be arranged to be equal to the distance between the center of the coil 130. The center of the first to third coils 120, 130, and 140 may be defined as the center of a circle or an ellipse when the coil is circular or elliptical, and a normal distance for each side of the polygon when the coil is polygonal Can be defined as any one point.

More specifically, the first to third coils 120, 130, and 140 may be arranged side by side in the x-axis direction of FIG. 1. In other words, the centers of the first to third coils 120, 130, and 140 may be located on any straight line parallel to the x-axis. At this time, the x-axis distance (d) between the centers of the first coil 120 and the third coil 140 is the x-axis distance (d) between the centers of the second coil 130 and the third coil 140. It can be the same.

In addition, for uniform power supply of the wireless charging device 100, the third coil 140 may have the same size and shape as the first and second coils 120 and 130.

4, all of the first to third coils 120, 130, and 140 may be implemented as circular flat coils. As described above, the third coil 140 is disposed to overlap the first and second coils 120 and 130, respectively, and the third coil 140 includes the first coil 120 and the third coil 140. The center-to-center distance may be arranged to be the same as the center-to-center distance of the second coil 130 and the third coil 140.

As described above, the present invention performs a wireless charging operation using a plurality of coils superimposed on the flat plate core 110, so that a user mounted on the wireless charging device 100 when a wireless charging operation described below is performed The power transmission operation may be performed in a wide area regardless of the location of the terminal 200.

Hereinafter, a region in which the first and second coils 120 and 130 and the third coil 140 overlap is defined as an overlap region RA. In other words, in each example illustrated in FIGS. 2 to 4, the regions where the first and second coils 120 and 130 and the third coil 140 overlap in the z-axis direction are defined as overlap regions RA. Specifically, the region where the first coil 120 and the third coil 140 overlap is referred to as the first overlap region RA1, and the region where the second coil 130 and the third coil 140 overlap is removed. It is defined as 2 overlapping area (RA2).

The magnetic fields generated by the first to third coils 120, 130, and 140 induce a current in the receiving coil Rc inside the user terminal 200, which will be described later, and the current induced in the receiving coil Rc is a user terminal. The internal battery 220 of 200 may be charged. In the charging operation using the electromagnetic induction method, the receiving coil Rc must be magnetically coupled to any one of the first to third coils 120, 130, and 140, and receiving is required to improve charging efficiency. The coil (Rc) should be magnetically coupled with a high coupling factor.

When the center of the receiving coil (Rc) coincides with the center of the first to third coils (120, 130, 140), the coupling between the receiving coil (Rc) and the first to third coils (120, 130, 140), respectively The coefficient can be maximal. For example, when viewed in the z-axis direction, when the center of the receiving coil Rc and the center of the first coil 120 coincide, the coupling coefficient between the receiving coil Rc and the first coil 120 may be maximum. .

On the other hand, the user terminal 200 may be mounted at any position above the top case (10u) shown in Figure 1, the center of the receiving coil (Rc) between the first to third coils (120, 130, 140) It may be located in the overlapping area RA. In this case, since the center of the receiving coil Rc is far from the center of the first coil 120 and the third coil 140 or the third coil 140 and the second coil 130, the coupling coefficient may be lowered. .

For example, when the center of the receiving coil Rc is located in the first overlapping area RA1, the center of the receiving coil Rc is spaced apart from the center of the first coil 120 and the third coil 140, respectively. Can be. Accordingly, the receiving coil Rc is magnetically coupled with the first coil 120 or the third coil 140 with a low coupling coefficient, and as a result, charging efficiency may be reduced.

The wireless charging device 100 of the present invention may further include a repeater 150 to prevent a decrease in charging efficiency that may occur when the receiving coil Rc is positioned on the overlapping area.

The repeater 150 may be disposed on the third coil 140 such that its interlinkage face overlaps the overlap region RA. The repeater 150 may be implemented with a PCB pattern, copper conductor, litz wire, or the like. On the other hand, in the present invention, the cross-linked surface is a surface that receives the magnetic flux generated by the first to third coils 120, 130, and 140. It can mean a cross section.

Hereinafter, the arrangement of the repeater 150 according to the structure of the first to third coils 120, 130 and 140 will be described in detail with reference to FIGS. 5 to 13.

In the first example, referring to FIG. 5, on the third coil 140, a single repeater 150 having a cross-linked surface overlapping a portion of the overlap region RA may be disposed. At this time, the cross section of the repeater 150 may be embodied in an oval shape, or may be embodied as a bent quadrangle.

In the first example, the repeater 150 may be disposed in the center of the first overlapping area RA1 and the second overlapping area RA2. In other words, the repeater 150 may be arranged such that the distance between the center of the repeater 150 and the first overlapping area RA1 is the same as the distance between the center of the repeater 150 and the second overlapping area RA2. have. As described above, the center of the repeater 150 may be defined as the center of the circle or ellipse when the repeater 150 is circular or elliptical, and when the repeater 150 is polygonal, the normal distance to each side of the polygon is all. It can be defined as any one of the same points.

More specifically, as shown in FIG. 5, the first to third coils 120, 130 and 140 and the repeater 150 may be arranged side by side in the x-axis direction. Accordingly, the first and second overlapping regions RA1 and RA2 and the repeater 150 may also be arranged side by side in the x-axis direction. At this time, the x-axis distance between the center of the repeater 150 and the first overlapping area RA1 may be the same as the x-axis distance between the center of the repeater 150 and the second overlapping area RA2. Through this arrangement, the center of the repeater 150 may be the same as the center of the third coil 140.

The length of the repeater 150 in the y-axis direction may be shorter than the length of the first and second overlapping regions RA1 and RA2 in the y-axis direction. Accordingly, a portion of the first and second overlapping regions RA1 and RA2 may be included in the region formed by the repeater 150.

Meanwhile, in the present invention, the crosslinked surface of the repeater 150 may be included in an area formed by the first to third coils 120, 130, and 140. The regions formed by the first to third coils 120, 130, 140, or the repeater 150, when viewed in the z-axis direction, are the first to third coils 120, 130, 140, or the repeater 150 ).

Referring to FIG. 5 in an example, the repeater 150 forms a certain area on the flat core 110, wherein the area formed by the repeater 150 is the first to third coils 120, 130, and 140. It can be included in the area surrounded by the edge of.

Referring to FIG. 6 in another example, the upper and lower edges of the first to third coils 120, 130, and 140 may be linearly connected when viewed in the z-axis direction. On the other hand, the crosslinked surface of the repeater 150 may be formed by being surrounded by an inner edge and an outer edge, and the crosslinked surface of the repeater 150 is included in an area formed by the first to third coils 120, 130, and 140. , When the repeater 150 forms the maximum area, the outer edge of the repeater 150 may be the same as the edge of the first to third coils 120, 130, and 140.

In the second example, referring to FIG. 7, the repeater 150 includes a first repeater 150a in which the crosslinked surface is partially overlapped with the first overlapping area RA1 and the second overlapping area RA2 with the crosslinking surface ) And a second repeater 150b disposed to partially overlap.

The first to third coils 120, 130, and 140, and the first and second repeaters 150a and 150b may be arranged side by side in the x-axis direction. At this time, the first repeater 150a may be disposed in the center of the first coil 120 and the third coil 140, and the second repeater 150b may include the third coil 140 and the second coil 130 ), the first repeater 150a and the second repeater 150b may be spaced apart at regular intervals in the x-axis direction.

In other words, in the first repeater 150a, the distance between the center of the first repeater 150a and the center of the first coil 120 is between the center of the first repeater 150a and the center of the third coil 140. It can be arranged to be equal to the distance of. In addition, the distance between the center of the second repeater 150b and the center of the second repeater 150b and the third coil 140 is between the center of the second repeater 150b and the center of the second coil 130. It can be arranged to equal the distance.

The lengths of the first and second repeaters 150a and 150b in the y-axis direction may be shorter than the lengths of the first and second overlapping regions RA1 and RA2 in the y-axis direction, respectively. Accordingly, a region formed by the first repeater 150a may include a portion of the first overlapping region RA1, and a region formed by the second repeater 150b may include a portion of the second overlapping region RA2. Can.

In the third example, referring to FIG. 8, the repeater 150 may be disposed such that the crosslinked surface overlaps all of the overlapping area RA.

The first to third coils 120, 130 and 140 and the repeater 150 may all be arranged side by side in the x-axis direction. Meanwhile, the repeater 150 may have the same center as the third coil 140 by being positioned at the center of the first coil 120 and the second coil 130.

At this time, the repeater 150 may be disposed to overlap with all of the overlapping regions RA formed by the first to third coils 120, 130, and 140. In other words, the chain cross-section of the repeater 150 when viewed in the z-axis direction may include all of the overlapping regions RA formed by the first to third coils 120, 130, and 140.

In the fourth example, referring to FIG. 9, the repeater 150 includes a first repeater 150a in which an area surrounded by an outer edge includes the first overlapping area RA1, and a second area surrounded by an outer edge. The second repeater 150b may be disposed to include the overlapping area RA2.

The first to third coils 120, 130, and 140, and the first and second repeaters 150a and 150b may be arranged side by side in the x-axis direction. At this time, the first repeater 150a may be disposed in the center of the first coil 120 and the third coil 140, and the second repeater 150b may include the third coil 140 and the second coil 130 ) Can be placed in the center

The lengths of the first and second repeaters 150a and 150b in the y-axis direction may be longer than the lengths of the first and second overlapping regions RA1 and RA2 in the y-axis direction, respectively. Also, the lengths of the first and second repeaters 150a and 150b in the x-axis direction may be longer than the lengths of the first and second overlapping regions RA1 and RA2 in the x-axis direction, respectively. Accordingly, the area surrounded by the outer edge of the first repeater 150a may completely include the first overlapping area RA1, and the area surrounded by the outer edge of the second repeater 150b may include the second overlapping area RA2. It may include completely.

In the fifth example, the first to third coils 120, 130, and 140 may have a hollow shape including a horizontal region HR, a vertical region VR, and a vertex region AR, respectively. At this time, the repeater 150 includes a first overlapping region RA1 and a second coil 130 and a third coil formed in the vertical region VR of the first coil 120 and the third coil 140 ( The second overlapping region RA2 formed in the vertical region VR of 140 may be disposed to be all included in the region surrounded by the inner edge.

Referring to FIG. 10, the first to third coils 120, 130, and 140 may have a hollow shape and a rectangular shape with a bent portion thereof. At this time, the first to third coils (120, 130, 140) of the cross-linked surface is the upper and lower horizontal regions (HR1, HR2), the left and right vertical regions (VR1, VR2) and four vertex regions (AR1, AR2, AR3, AR4).

Referring to FIG. 11, when the first to third coils 120, 130, and 140 are disposed on the flat core 110, the right vertical region VR2 and the third coil 140 of the first coil 120 are The first overlapping region VRA1 may be formed in the left vertical region VR1 of the first and may be formed in the right vertical region VR2 of the third coil 140 and the left vertical region VR1 of the second coil 130. Two overlapping regions VRA2 may be formed. At this time, the repeater 150 may be disposed such that the region surrounded by the inner edge includes both the first and second overlapping regions VRA1 and VRA2 formed by each vertical region VR.

In the sixth example, referring to FIG. 12, the first to third coils 120, 130, and 140 may have the same shape as described in the fifth example. At this time, the repeater 150, the inner edge of the first coil 120 and the third coil 140, the first overlapping region formed in the vertical region (VR) (VRA1) is disposed to include a first repeater ( 150a) and a second repeater 150b having an inner edge disposed to include the second overlapping region VRA2 formed in the vertical region VR of the second coil 130 and the third coil 140. Can.

The first to third coils 120, 130 and 140, and the first and second repeaters 150a and 150b may be arranged side by side in the x-axis direction, and the first repeater 150a and the second repeater 150b ) May be spaced apart at regular intervals in the x-axis direction. At this time, while the first repeater 150a is disposed in the center of the first coil 120 and the third coil 140, the inner edges thereof are disposed to include the first overlapping region VRA1 formed in the vertical region VR. Can be. In addition, while the second repeater 150b is disposed in the center of the third coil 140 and the second coil 130, the inner edge thereof is disposed to include the second overlapping region VRA2 formed in the vertical region VR. Can.

In the seventh example, referring to FIG. 13, the first to third coils 120, 130, and 140 may have the same shape as described in the fifth example, and two vertical regions VR of the third coil 140 ) May completely overlap one vertical region VR of the first coil 120 and one vertical region VR of the second coil 130. More specifically, the left vertical region VR1 of the third coil 140 may be completely overlapped with the right vertical region VR2 of the first coil 120, and the right vertical region VR2 of the third coil 140 may be completely overlapped. ) May completely overlap the left vertical region VR1 of the second coil 130.

At this time, the repeater 150, the area surrounded by the inner edge is disposed so as to coincide with the first overlapping area VRA1 formed in the vertical area VR of the first coil 120 and the third coil 140. 1 repeater 150a and a second repeater arranged such that the region surrounded by the inner edge matches the second overlapping region VRA2 formed in the vertical region VR of the second coil 130 and the third coil 140. It may include (150b).

In other words, the first and second repeaters 150a and 150b are the first and second hollow regions of the first and second repeaters 150a and 150b formed by each vertical region VR when viewed from the z-axis. The second overlapping regions VRA1 and VRA2 may be arranged to be the same.

The repeater 150 according to each example described with reference to FIGS. 5 to 13 may receive a magnetic field generated by at least one coil of the first to third coils 120, 130, and 140 through a chain bridge. The magnetic field received on the crosslinked surface may induce a current in the conducting wire constituting the repeater 150, and the repeater 150 may generate a magnetic field due to the induced current. Accordingly, the receiving coil Rc in the user terminal 200 may receive power through the magnetic fields generated from the first to third coils 120, 130, and 140 and the magnetic field generated through the repeater 150. .

Meanwhile, the resonant frequency of the above-described repeater 150 may be set larger than the resonant frequency of the first to third coils 120, 130, and 140.

The repeater 150 may be an LC resonant circuit including a wound wire and a capacitor connected to both ends of the wire. Accordingly, the repeater 150 has a unique resonant frequency, and the resonant frequency of the repeater 150 may be set to be greater than the resonant frequencies of the first to third coils 120, 130, and 140.

In the above-described wireless charging operation, when the resonant frequency of the repeater 150 is set larger than the resonant frequency of the first to third coils 120, 130, and 140, the resonant frequency of the repeater 150 and each coil are matched. While the power transmission distance is shorter than in the case, the voltage gain may increase. When the voltage gain increases, even when the voltage applied to the first to third coils 120, 130, and 140 decreases, the same power may be supplied to the receiving coil Rc.

As described above, the user terminal 200 is mounted on the top case 10u of the wireless charging device 100 to be wirelessly charged, so that the receiving coil Rc and the first to third coils 120 in the user terminal 200 , 130, 140) can be very close. Accordingly, the resonant frequency of the repeater 150 may be preset to increase the voltage gain instead of partially reducing the power transmission distance, for example, 1.1 of the resonant frequency of the first to third coils 120, 130, and 140. It can be set between 2 times and 2 times.

As described above, according to the present invention, by arranging the repeater 150 on a plurality of coils overlapped to perform a wireless charging operation, it is possible to prevent a decrease in efficiency of power transmission that may occur due to overlapping of the transmission coils Tc. have.

Hereinafter, the wireless charging system 1 will be described in detail with reference to FIGS. 14 to 16.

14 is a diagram illustrating a wireless charging system according to an embodiment of the present invention, and FIG. 15 is a diagram showing a control flow of the wireless charging system shown in FIG. 14.

16 is a diagram for explaining a method of supplying power to each user terminal when a plurality of user terminals are located on a wireless charging device.

14, the wireless charging system 1 according to an embodiment of the present invention may include the above-described wireless charging device 100 and the user terminal 200. The wireless charging system 1 shown in FIG. 14 is according to an embodiment, and its components are not limited to the embodiment shown in FIG. 14, and some components may be added, changed, or deleted as necessary. have.

The wireless charging device 100 may have any structure described with reference to FIGS. 1 to 13 above. However, hereinafter, it will be described assuming that the flat core 110 in the wireless charging device 100 is implemented as the first and second flat cores 110a and 110b spaced apart, and the first to third coils described above. (120, 130, 140) will be referred to as the transmission coil (Tc) as needed.

The wireless charging device 100 may be connected to external power and receive driving power. Here, the external power is an arbitrary voltage for supplying a voltage, for example, it may be a commercial power used at home. In order to receive the voltage from the external power supply, a separate cable (not shown) may be further provided in the wireless charging device 100.

15, the user terminal 200 may be any device including a battery 220 and a receiving coil Rc and a micro control unit (MCU) 210 controlling them, for example, a smart phone , A mobile device such as a tablet.

Referring back to FIGS. 14 and 15, the electromagnetic induction phenomenon will be briefly described. When the user terminal 200 is mounted on the wireless charging device 100 or approaches the wireless charging device 100, the user terminal 200 The receiving coil Rc and the transmitting coil Tc in the wireless charging device 100 may be magnetically coupled.

At this time, when a current flows through the transmission coil Tc, a magnetic field may be generated in the transmission coil Tc, and a current due to a magnetic field may be induced in the reception coil Rc, and the induced current charges the battery 220 can do. When the current induced to the receiving coil Rc is supplied to the battery 220, the MCU 210 controls a power conversion device such as a converter to convert the induced current to a voltage required by the battery 220. .

In this wireless charging operation, the receiving coil Rc may be supplied with power from any one of the transmitting coils Tc of the first to third coils 120, 130, and 140 in the wireless charging module. Hereinafter, a process in which the wireless charging module determines one coil to supply power to the user terminal 200 and supplies power through the coil will be described in detail.

The wireless charging device 100 may determine any one transmission coil Tc closest to the reception coil Rc in the user terminal 200 as a coil to supply power to the user terminal 200. To this end, the first to third coils 120, 130, and 140 may sequentially transmit a request signal under the control of the control unit 160 and receive a response signal to the request signal from the user terminal 200. .

More specifically, the control unit 160 may transmit a request signal by sequentially applying current to the first to third coils 120, 130, and 140. The user terminal 200 receiving the request signal through the receiving coil Rc may transmit a response signal through the receiving coil Rc. Accordingly, the response signals may be sequentially received by sequentially applying currents to the first to third coils 120, 130, and 140.

The controller 160 determines any one of the first to third coils 120, 130, and 140 as a coil to supply power to the user terminal 200 according to the strength of the received response signal, and the voltage to the coil Can supply

More specifically, the control unit 160 may detect the intensity of the response signal whenever the response signal is received. In other words, each time the request signal is transmitted through the first to third coils 120, 130, and 140, the control unit 160 may detect the intensity of the response signal corresponding thereto. The control unit 160 may identify the transmission coil Tc to which the current is applied when the response signal of the greatest intensity is received, and the identified transmission coil Tc to the transmission coil Tc closest to the reception coil Rc ).

Referring to FIG. 16 as an example, the controller 160 may sequentially apply currents to the first to third coils 120, 130, and 140. For example, when the first user terminal 200a is located on the first flat core 110a, the intensity of the response signal received when the current is applied to the first coil 120 may be greatest. Based on this, the control unit 160 may determine that the first user terminal 200a is closest to the first coil 120. Accordingly, the controller 160 may determine the first coil 120 as a coil to supply power to the user terminal 200, and wirelessly charge the user terminal 200 by supplying a voltage to the first coil 120. Can.

In addition, when the second user terminal 200b is located on the second flat core 110b, for example, the intensity of the response signal received when the current is applied to the second coil 130 may be greatest. Based on this, the control unit 160 may determine the second coil 130 as a coil to supply power to the user terminal 200, and wirelessly charge the user terminal 200 by supplying a voltage to the second coil 130. Can.

Unlike the above, when two user terminals 200 are mounted on the wireless charging device 100, the wireless charging device 100 transmits any two closest to the receiving coil Rc in each user terminal 200 The coil Tc may be determined as a coil to supply power to the user terminal 200.

Referring back to FIG. 16, the first and second user terminals 200a and 200b may be mounted on the wireless charging device 100 together. At this time, the control unit 160 transmits a request signal by sequentially applying a current to the first to third coils 120, 130, and 140 as described above, and when a response signal corresponding to the request signal is received, the corresponding response Terminal information included in the signal may be identified.

Here, the terminal information is unique information of the user terminal 200, and may be any information capable of specifying each user terminal 200. Hereinafter, for convenience of description, terminal information of the first and second user terminals 200a and 200b is expressed as first and second terminal information, respectively.

When the current is applied to the first and third coils 120 and 140, the control unit 160 identifies the first terminal information included in the received response signal, and determines the first user terminal 200a's position first and second. It can be identified on the third coil (120, 140). In addition, the control unit 160 identifies the second terminal information included in the response signal received when the current is applied to the second coil 130, so that the position of the second user terminal 200b is the second coil 130 It can be identified as a phase.

The control unit 160 may supply voltages to any two coils of the first to third coils 120, 130, and 140, respectively, according to the strength of the response signal detected for each terminal information.

More specifically, the control unit 160 may compare strengths of two response signals including first terminal information as each response signal received when current is first applied to the first and third coils 120 and 140. . As a result of comparison, the control unit 160 may identify a transmission coil Tc to which a current is applied when a response signal of a greater intensity is received, and supply the identified transmission coil Tc to the user terminal 200. You can decide with a coil.

For example, when the intensity of the response signal received when the current is applied to the first coil 120 is greater than the intensity of the response signal received when the current is applied to the third coil 140, the control unit 160 may first The coil 120 may be determined as a coil to supply power to the user terminal 200, and the first user terminal 200a may be wirelessly charged by supplying a voltage to the first coil 120.

In addition, the control unit 160 may compare the strength of the response signal including the second terminal information as the response signal received when the current is applied to the second coil 130. However, in the example of FIG. 16, since the response signal including the second terminal information is received only when the current is applied to the second coil 130, the control unit 160 uses the second coil 130 as the user terminal 200. It may be determined as a coil to supply power to the second coil 130, and wirelessly charge the second user terminal 200b by supplying a voltage to the second coil 130.

As described above, when performing a charging operation for a plurality of user terminals 200, the present invention is a core having a different magnetic field generated on one core by superposing and placing a plurality of coils on two separate flat cores 110 It is possible to prevent the interference and accordingly has the effect of charging a plurality of user terminals 200 at the same time.

The above-described embodiments of the present invention, as well as those skilled in the art to which the present invention pertains, are capable of various substitutions, modifications and changes without departing from the technical spirit of the present invention. It is not limited by.

Claims (14)

First and second coils spaced apart on the flat plate core;
A third coil disposed on the first and second coils to form an overlapping region with the first and second coils; And
And at least one repeater disposed on the third coil such that an interlinkage face overlaps the overlapping region.
Wireless charging device.
According to claim 1,
The flat core includes first and second flat cores spaced apart from each other,
The first and second coils are disposed on the first and second flat plate cores, respectively.
Wireless charging device.
According to claim 1,
The first and second coils are respectively disposed in regions formed by the first and second flat plate cores.
Wireless charging device.
According to claim 1,
The distance between the center of the third coil and the center of the first coil is the same as the distance between the center of the third coil and the center of the second coil.
Wireless charging device.
According to claim 1,
The repeater
A first repeater arranged such that the crosslinked surface partially overlaps a first overlapping region between the first coil and the third coil;
And a second repeater arranged such that the crosslinked surface partially overlaps with a second overlapping region between the second coil and the third coil.
Wireless charging device.
According to claim 1,
The crosslinked surface is included in an area formed by the first to third coils.
Wireless charging device.
According to claim 1,
The repeater is arranged such that the crosslinked surface overlaps all of the overlapping region.
Wireless charging device.
According to claim 1,
The repeater
A first repeater disposed such that an area surrounded by outer edges includes a first overlapping area between the first coil and the third coil,
An area surrounded by an outer edge including a second repeater disposed to include a second overlapping area between the second coil and the third coil
Wireless charging device.
According to claim 1,
Each of the first to third coils has a hollow shape including a horizontal region, a vertical region, and a vertex region,
The repeater may include a first overlapping region formed in a vertical region of the first coil and the third coil, and a second overlapping region formed in a vertical region of the second coil and the third coil surrounded by an inner edge. All inclusive
Wireless charging device.
According to claim 1,
Each of the first to third coils has a hollow shape including a horizontal region, a vertical region, and a vertex region,
The repeater
A first repeater disposed such that an inner edge includes a first overlapping region formed in a vertical region of the first coil and the third coil,
An inner edge including a second repeater disposed to include a second overlapping region formed in a vertical region of the second coil and the third coil
Wireless charging device.
The method of claim 10,
The two vertical regions of the third coil are completely overlapped with one vertical region of the first coil and one vertical region of the second coil, respectively.
The repeater
A first repeater disposed such that an area surrounded by an inner edge coincides with a first overlapping area formed in a vertical area of the first coil and the third coil,
And a second repeater arranged such that an area surrounded by an inner edge coincides with a second overlapping area formed in a vertical area of the second coil and the third coil.
Wireless charging device.
According to claim 1,
The resonant frequency of the repeater is set larger than the resonant frequency of the first to third coils
Wireless charging device.
According to claim 1,
The first to third coils sequentially transmit a request signal under the control of the control unit, and receive a response signal to the request signal from the user terminal,
The control unit is a wireless charging device that supplies a voltage to any one of the first to third coils according to the intensity of the response signal.
According to claim 1,
The first to third coils sequentially transmit request signals under control of the control unit, and receive response signals to the request signals from a plurality of user terminals,
The control unit identifies the terminal information included in the response signal, and supplies wireless voltage to any two coils of the first to third coils according to the strength of the response signal detected for each terminal information.

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