Coil component and wireless power transmission device comprising the same

Abstract

We provide coil components suitable for wireless power transmission devices that comply with multiple standards. [Solution] The coil component 1 comprises a magnetic body 10 having a plurality of regions whose positions in the XY plane are different from each other, and a first coil 100 and a second coil 200 that overlap the magnetic body 10 in the Z direction. The plurality of regions include a first region A1 and a second region A2 located outside the first region A1 in the XY plane. The thickness T2 of the second region A2 of the magnetic body 10 in the Z direction is thinner than the thickness T1 of the first region A1 of the magnetic body 10 in the Z direction. The first coil 100 is positioned to overlap with the first region A1 of the magnetic body 10, and the second coil 200 is positioned to overlap with the second region A2 of the magnetic body 10.

Description

Technical Field

[0001] The present disclosure relates to a coil component and a wireless power transmission device including the same.

Background Art

[0002] As a charging system for mobile devices such as smartphones, a wireless power transmission device using a coil component is known. For example, Patent Document 1 discloses a power transmission device including a plurality of power transmission coils conforming to different standards. The power transmission device disclosed in Patent Document 1 includes magnetic bodies respectively assigned to the plurality of power transmission coils.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, wireless power transmission devices compliant with both the EPP (Extended Power Profile) standard and the MPP (Magnetic Power Profile) standard have attracted attention. This type of wireless power transmission device includes a first coil compliant with the EPP standard and a second coil compliant with the MPP standard.

[0005] The present disclosure describes a coil component capable of further reducing magnetic loss.

Means for Solving the Problems

[0006] A coil component according to one embodiment of the present disclosure comprises a magnetic body having a plurality of regions whose positions in a planar direction perpendicular to the thickness direction are different from each other, and a first coil and a second coil facing one side surface of the magnetic body in the thickness direction, wherein the plurality of regions include a first region and a second region located outward in the planar direction from the first region, the thickness of the second region of the magnetic body in the thickness direction is thinner than the thickness of the first region of the magnetic body in the thickness direction, the first coil is positioned to overlap with the first region of the magnetic body, and the second coil is positioned to overlap with the second region of the magnetic body. [Effects of the Invention]

[0007] This disclosure provides a coil component capable of further reducing magnetic loss. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic cross-sectional view illustrating the structure of a coil component 1 according to one embodiment of the present disclosure. [Figure 2] Figure 2 is a schematic plan view of coil component 1 as seen from the direction of the coil axis. [Figure 3] Figure 3 is a plan view of the magnetic material 10. [Figure 4] Figure 4 is a schematic cross-sectional view illustrating the structure of coil component 1A according to the first modification. [Figure 5] Figure 5 is a schematic cross-sectional view illustrating the structure of coil component 1B according to a second modification. [Figure 6] Figure 6 is a schematic diagram showing the electrical connection relationship between the first coil 100 and the second coil 200. [Figure 7] Figure 7 is an explanatory diagram of the operation of coil component 1, showing the connection relationship in EPP mode. [Figure 8] Figure 8 is an explanatory diagram of the operation of coil component 1, showing the connection relationship in MPP mode. [Figure 9] Figure 9 is a block diagram showing an example of the configuration of a wireless power transmission device 60 using coil component 1. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the attached drawings.

[0010] Figure 1 is a schematic cross-sectional view illustrating the structure of a coil component 1 according to one embodiment of the present disclosure. Figure 2 is a substantially plan view of the coil component 1 as seen from the direction of the coil axis.

[0011] As shown in Figures 1 and 2, the coil component 1 according to this embodiment comprises a magnetic body 10 with its thickness in the Z direction, a first coil 100 and a second coil 200 that overlap the magnetic body 10 in the Z direction, and a magnet module 30 fixed to the back surface 22 of the housing 20. The front surface 21 of the housing 20 constitutes a mounting surface for placing an electronic device 40 (a device to be charged), such as a smartphone. For the sake of clarity in the drawings, the housing 20 is omitted in the plan view shown in Figure 2.

[0012] Both the first coil 100 and the second coil 200 function as power transmission coils for wireless power transmission. The first coil 100 is used for wireless power transmission in MPP mode, and the second coil 200 is used for wireless power transmission in EPP mode. As will be described later, a portion of the first coil 100 operates in EPP mode together with the second coil 200. EPP is one of the wireless charging standards, enabling fast charging with a maximum output of 15W, and allows wireless power transmission through bidirectional communication between the transmitting and receiving sides. MPP is another wireless charging standard, also known as the Qi2 standard, which achieves high power transmission efficiency and convenience by using magnets to precisely align the power transmission coil and the power receiving coil.

[0013] The magnetic material 10 functions as a magnetic path for the magnetic flux generated by the first coil 100 and the second coil 200. The magnetic material 10 may be made of a bulk magnetic material such as a ferrite sintered body. The relative permeability of the magnetic material constituting the magnetic material 10 may be 300 or higher. This makes it possible to obtain a high inductance value.

[0014] Figure 3 is a plan view of the magnetic material 10.

[0015] As shown in Figures 1 to 3, the magnetic material 10 has four regions A1 to A4, which are located at different positions in the XY plane direction, perpendicular to the Z direction (thickness direction). The fourth region A4 is located in the center in the XY plane direction and has a circular shape with a portion cut out when viewed from the Z direction. The first region A1 surrounds the fourth region A4 and is located further out in the XY plane direction than the fourth region A4 and has an annular shape with a portion divided by the slit 15 when viewed from the Z direction. The third region A3 surrounds the first and fourth regions A1 and A4 and is located further out in the XY plane than the first and fourth regions A1 and A4 and has an annular shape with a portion divided by the slit 15 when viewed from the Z direction. The second region A2 is located outside the third region A3, the first region A1, and the fourth region A4 in the XY plane direction, surrounding them, and has an annular shape in a plan view from the Z direction, with a portion of it being divided by the slit 15. In the examples shown in Figures 1 to 3, the second region A2 is the outermost region of the magnetic material 10, but there may be other regions outside of the second region A2. Also, in the examples shown in Figures 1 to 3, the fourth region A4 is the innermost region of the magnetic material 10, but there may be other regions inside of the fourth region A4. Furthermore, there may be other regions between two adjacent regions, for example, between the first region A1 and the fourth region A4. In this embodiment, the fourth region A4 has a circular shape with a portion of it cut out in a plan view, but it may also have an elliptical or polygonal shape with a portion of it cut out. Furthermore, in this embodiment, the first to third regions A1 to A3 have an annular shape in which a portion is divided by the slit 15 when viewed from above, but they may also have an elliptical annular shape or a polygonal annular shape in which a portion is divided by the slit 15.

[0016] In this embodiment, the first region A1 to the fourth region A4 included in the magnetic body 10 are not made of different members from each other, but are part of an integral magnetic body 10. For example, when the magnetic body 10 is made of a ferrite sintered body, the magnetic body 10 is an integral sintered body including the first region A1 to the fourth region A4. That is, there is no physical boundary between the regions, and thus the boundary portion between one region and another region does not become a magnetoresistance. In this embodiment, since an integral magnetic body 10 is used and the first coil 100 is disposed on the first region A1 of the magnetic body 10 and the second coil 200 is disposed on the second region A2 of the magnetic body 10, it is possible to suppress the magnetic path from being divided inside the magnetic body 10.

[0017] When the thicknesses of the first region A1 to the fourth region A4 in the Z direction are T1 to T4, respectively, T1 > T2, T3 > T1, and T4 > T1. That is, the thickness of the second region A2 of the magnetic body 10 in the Z direction is thinner than the thickness of the first region A1 of the magnetic body 10 in the Z direction. The thicknesses T3 and T4 may be the same. When the thicknesses T3 and T4 are the same, the surface 13 on one side (+Z direction side) in the thickness direction of the third region A3 and the surface 14 on one side (+Z direction side) in the thickness direction of the fourth region A4 constitute the same plane. Regarding the back surface located on the -Z direction side of the magnetic body 10, it may constitute the same plane across the first region A1 to the fourth region A4. The surface 13 of the third region A3 and the surface 14 of the fourth region A4 may be adhered to the back surface 22 of the housing 20. Here, the height position of the upper surface of the first coil 100 from the surface 11 on one side (+Z direction side) in the thickness direction of the first region A1 of the magnetic body 10 may be lower than the height position of the surface 13 of the third region A3 of the magnetic body 10. In other words, the surface on one side in the thickness direction of the third region A3 may be located on one side in the thickness direction rather than the first coil 100. According to this, it is possible to prevent interference between the housing 20 and the first coil 100.

[0018] The first coil 100 is disposed on the surface 11 of the first region A1 of the magnetic body 10 so as to overlap with the first region A1 of the magnetic body 10 in the Z direction. As a result, the back surface of the first coil 100 is covered from the Z direction by the first region A1 of the magnetic body 10, the innermost turn is covered from the XY plane direction by the fourth region A4 of the magnetic body 10, and the outermost turn is covered from the XY plane direction by the third region A3 of the magnetic body 10.

[0019] The second coil 200 is disposed on the surface 12 on one side (+Z direction side) in the thickness direction of the second region A2 of the magnetic body 10 so as to overlap with the second region A2 of the magnetic body 10 in the Z direction. As a result, the back surface of the second coil 200 is covered from the Z direction by the second region A2 of the magnetic body 10, and the innermost turn is covered from the XY plane direction by the third region A3 of the magnetic body 10.

[0020] And as described above, since the thickness T2 of the second region A2 of the magnetic body 10 in the Z direction is thinner than the thickness T1 of the first region A1 of the magnetic body 10 in the Z direction, the height position (position in the Z direction) of the second coil 200 is lower than the height position (position in the Z direction) of the first coil 100. As a result, a larger space is formed above the second coil 200 (+Z direction side) than above the first coil 100 (+Z direction side). The magnet module 30 fixed to the back surface 22 of the housing 20 is disposed in the space above the second coil 200 thus formed, thereby preventing interference between the second coil 200 and the magnet module 30.

[0021] The first coil 100 and the second coil 200 may both have a structure in which a coated conductor, which is the core material, is covered with an insulating coating such as resin, and this coated conductor is wound over multiple turns. This allows for a reduction in the resistance values ​​of the first coil 100 and the second coil 200, and makes it easier to change the design, such as the number of turns and wire diameter. The wire diameter of the second coil 200 may be smaller than that of the first coil 100. This prevents interference between the second coil 200 and the magnet module 30, and makes it possible to increase the number of turns of the second coil 200. For the first coil 100, the resistance value can be reduced by using a coated conductor with a larger wire diameter than the second coil 200. The first coil 100 may be a stranded wire containing multiple core materials. This makes it possible to ensure a sufficient wire diameter while suppressing the increase in AC resistance due to the skin effect and proximity effect. In contrast, the second coil 200 may be a single wire consisting of a single core material. This makes it possible to reduce the resistance while keeping the wire diameter low. The first coil 100 and the second coil 200 may be FPC (Flexible Printed Circuit) coils with a coil pattern formed on a flexible substrate, or pattern coils with a coil pattern formed on an insulating film substrate such as PET (polyethylene terephthalate) or PI (polyimide).

[0022] Furthermore, the combined thickness of the second coil 200 and the second region A2 of the magnetic material 10 in the Z direction may be thinner than the thickness T1 of the first region A1 of the magnetic material 10. In other words, the height of the upper surface of the second coil 200 from the surface 12 of the second region A2 of the magnetic material 10 may be lower than the height of the surface 11 of the first region A1 of the magnetic material 10. In this case, the second coil 200 is located in the Z direction between the surface of the first region A1 of the magnetic material 10 on the +Z direction side and the surface of the second region A2 of the magnetic material 10 on the +Z direction side. This makes it possible to prevent interference between the second coil 200 and the magnetic module 30 even when the thickness of the magnet module 30 is large.

[0023] Here, if D1 is the distance in the XY plane between the innermost turn of the second coil 200 and the third region A3 of the magnetic material 10, and D2 is the distance in the XY plane between the outermost turn of the first coil 100 and the third region A3 of the magnetic material 10, then D1 ≥ D2 is acceptable. Also, if D3 is the distance in the XY plane between the outermost turn of the second coil 200 and the outer edge of the magnetic material 10, then D1 ≥ D3 is acceptable. Furthermore, if D4 is the distance in the XY plane between the innermost turn of the first coil 100 and the fourth region A4 of the magnetic material 10, then D1 ≥ D4 is acceptable. In this way, by setting the distance D1 to be greater than or equal to the other distances D2 to D4, it is possible to suppress variations in the characteristics of the second coil 200. This is because the effect of the separation distance D1 on the characteristics of the second coil 200 is greater than the effect of the separation distances D2 and D4 on the characteristics of the first coil 100, and the effect of the separation distance D3 on the characteristics of the second coil 200.

[0024] As shown in Figure 3, the magnetic material 10 may have a slit 15 extending in the Y direction. The insulated wires constituting the first coil 100 and the second coil 200 may be led out to the outside through the slit 15 provided in the magnetic material 10. This makes it possible to prevent interference between the insulated wires led out from the first coil 100 and the second coil 200 and the magnetic material 10.

[0025] Furthermore, the magnetic material 10 may be composed of two magnetic materials. For example, as shown in the modified coil components 1A and 1B in Figures 4 and 5, the magnetic material 10A on which the first coil 100 is placed and the magnetic material 10B on which the second coil 200 is placed may be joined together by an adhesive layer 16. In the coil component 1A shown in Figure 4, the magnetic material 10B on which the second coil 200 is placed has a protrusion in the center, and the magnetic material 10A on which the first coil 100 is placed is joined to this protrusion via the adhesive layer 16. In the coil component 1B shown in Figure 5, the flat magnetic material 10B on which the second coil 200 is placed and the magnetic material 10A on which the first coil 100 is placed are joined via the adhesive layer 16. Thus, the magnetic material 10A, which is composed of the upper parts of the first region A1, the third region A3, and the fourth region A4, may be combined with the magnetic material 10B, which is composed of the entirety of the second region A2 and the lower parts of the first region A1, the third region A3, and the fourth region A4. In this case, a magnetic material 10 with a complex shape can be easily realized. Furthermore, in the structure of Figure 5, the influence of changes in magnetic properties due to misalignment when bonding the magnetic materials 10A and 10B together can be suppressed. Note that in Figures 4 and 5, the thickness of the first region A1, the third region A3, and the fourth region A4 is the total thickness of the magnetic materials 10A and 10B, excluding the thickness of the adhesive layer 16.

[0026] The above describes the structure of the coil component 1 according to this embodiment. When an electronic device 40, such as a smartphone, is placed on the surface 21 of the housing 20 included in the coil component 1 having such a configuration, the first coil 100 or the second coil 200, which is a power transmission coil, and the power receiving coil 41 included in the electronic device 40 become magnetically coupled. As a result, power is transmitted wirelessly from the coil component 1 to the electronic device 40.

[0027] The magnet module 30 is arranged in a ring shape on the back surface 22 of the housing 20 so as to overlap with the second coil 200. Here, "arranged in a ring shape" includes not only the state in which it is arranged as a complete ring, but also the state in which a part of the magnet module 30 is removed, as shown in Figure 2. The magnet module 30 positions the power receiving coil 41 relative to the first coil 100 and the second coil 200 by the attractive force acting between it and the magnet 42 provided on the electronic device 40 side. As described above, the second coil 200 has a portion that overlaps with the magnet module 30 when viewed from the coil axis direction (Z direction) of the second coil 200, but the second coil 200 and the magnet module 30 are arranged spaced apart from each other, as shown in Figure 1.

[0028] One or more turns of the second coil 200, including the innermost turn, may be located inside the inner surface of the magnet module 30 when viewed from the Z direction. This makes it possible to ensure magnetic coupling between the second coil 200 and the power receiving coil 41 without the magnet module 30 completely obstructing the magnetic coupling between them.

[0029] The first coil 100 consists of an outer circumference portion 110 composed of a predetermined number of turns on the outer circumference side, including the outermost turn, and an inner circumference portion 120 composed of a predetermined number of turns on the inner circumference side, including the innermost turn. The number of turns in the outer circumference portion 110 may be less than the number of turns in the inner circumference portion 120. Even if the number of turns in the outer circumference portion 110 is less than the number of turns in the inner circumference portion 120, the track length of the outer circumference portion 110 may be longer than that of the inner circumference portion 120. The outer circumference portion 110 and the inner circumference portion 120 of the first coil 100 are not directly connected, but are connected via lead wires.

[0030] Figure 6 is a schematic diagram showing the electrical connection relationship between the first coil 100 and the second coil 200.

[0031] As shown in Figure 6, the winding direction of the first coil 100 is counterclockwise from the outer circumference 102 to the inner circumference 101, while the winding direction of the second coil 200 is clockwise from the outer circumference 202 to the inner circumference 201. The outer circumference 102 of the first coil 100 is connected to terminal 52. The outer circumference 202 of the second coil 200 is connected to terminal 54 via switch SW1. The first coil 100 has an outer circumference 110 and an inner circumference 120. Lead wires 53A and 53B are connected to the inner circumference 111 of the outer circumference 110 and the outer circumference 122 of the inner circumference 120, respectively, and are led out to the outside of the winding region of the first coil 100 via lead wires 53A and 53B. The inner circumference 101 of the first coil 100 is connected to terminal 51 via switch SW2. The inner circumference end 201 of the second coil 200 is led out to the outside of the winding region of the second coil 200 via a lead wire 53C, and is connected to the inner circumference end 111 of the outer circumference portion 110 and the outer circumference end 122 of the inner circumference portion 120 of the first coil 100 via lead wires 53A and 53B.

[0032] The position of the outer peripheral end 122 of the inner peripheral portion 120 is adjacent to the position of the inner peripheral end 111 of the outer peripheral portion 110. Therefore, the apparent configuration of the first coil 100 is almost the same as that of a single planar spiral coil formed by continuously winding a single wire.

[0033] Figures 7 and 8 are diagrams illustrating the operation of coil component 1, with Figure 7 showing the connection relationship in EPP mode and Figure 8 showing the connection relationship in MPP mode.

[0034] As shown in Figure 7, when operating coil component 1 in EPP mode (first power transmission mode), switch SW1 is turned ON and switch SW2 is turned OFF. This connects the second coil 200 and the inner end 111 of the outer circumference 110 of the first coil 100 in series, forming a single coil. When current flows from the outer circumference 202 to the inner circumference 201 of the second coil 200, the current flows clockwise. Also, when current flows from the inner circumference 111 to the outer circumference 112 of the outer circumference 110, the current flows clockwise. Therefore, the direction of the loop current from the second coil 200 and the direction of the loop current from the outer circumference 110 of the first coil 100 can be matched, and the outer circumference 110 can be used as part of the second coil. In other words, the combination of the outer circumference 110 of the first coil 100 and the second coil 200 forms a single coil, and the outer circumference 110 of the first coil 100 functions as part of the EPP coil. Power is supplied from the power transmission circuit 61 between the pair of terminals 52 and 54 of the EPP coil.

[0035] As shown in Figure 8, when operating coil component 1 in MPP mode (second power transmission mode), switch SW1 is turned off and switch SW2 is turned on. This connects the outer circumference 110 and inner circumference 120 of the first coil 100 in series. In other words, the combination of the outer circumference 110 and inner circumference 120 of the first coil 100 becomes a single coil, and the entire first coil 100 functions as an MPP coil. Power is supplied from the power transmission circuit 61 between the pair of terminals 51 and 52 of the MPP coil.

[0036] Thus, when the winding directions of the first coil 100 and the second coil 200 are opposite to each other, by connecting the inner end 201 of the second coil 200 to the inner end 111 of the outer part 110 and the outer end 122 of the inner part 120, it is possible to support two modes, MPP mode and EPP mode, simply by switching SW1 between the outer end 202 of the second coil 200 and terminal 54, and switch SW2 between the inner end 121 of the inner part 120 of the first coil 100 and terminal 51 on and off. In other words, this can be achieved by connecting one of a pair of output terminals connected to a single power transmission circuit 61 to terminal 52, and the other to either terminal 51 or terminal 54 by selection with a switch, thus reducing the number of switches, and furthermore, the selection operation of these two modes can be easily achieved by using a multiplexer.

[0037] In this case, when power transmission is performed in EPP mode, the magnet module 30 is present in the power transmission direction of the second coil 200, which may cause magnetic loss due to the magnet module 30 and reduce the magnetic coupling with the power receiving coil 41 included in the electronic device 40. However, in this embodiment, the thickness T2 of the second region A2 of the magnetic material 10 on which the second coil 200 is located is thinner than the thickness T1 of the first region A1 of the magnetic material 10 on which the first coil 100 is located. Therefore, a distance in the Z direction can be secured between the second coil 200 and the magnet module 30, thereby suppressing the reduction in magnetic coupling due to the presence of the magnet module 30. Furthermore, by connecting the outer periphery 110, which is a part of the first coil 100 that does not overlap with the magnet module 30, to the second coil 200 and driving a part of the first coil 100 together with the second coil 200, the reduction in magnetic coupling due to the presence of the magnet module 30 can be suppressed. Furthermore, if one or more turns of the second coil 200, including the innermost turn, are positioned inward from the inner surface of the magnet module 30 when viewed from the Z direction, the reduction in magnetic coupling can be suppressed more effectively.

[0038] Figure 9 is a block diagram showing an example of the configuration of a wireless power transmission device 60 using coil component 1.

[0039] The wireless power transmission device 60 shown in Figure 9 comprises a coil component 1 having a first coil 100 and a second coil 200, a power transmission circuit 61 connected to a series circuit of the second coil 200 and the outer circumference 110 of the first coil 100 and a series circuit of the outer circumference 110 of the first coil 100 and the inner circumference 120 of the first coil 100, and a control circuit 62 that controls the power transmission circuit 61 and switches SW1 and SW2.

[0040] The wireless power transmission device 60 also includes switches SW1 and SW2 for switching the power transmission mode. Switch SW1 (first switch) is for switching the connection state between the second coil 200 and the power transmission circuit 61. Switch SW2 (second switch) is for switching the connection state between the outer periphery 110 of the first coil 100 and the power transmission circuit 61. Switches SW1 and SW2 may be semiconductor switches mounted on a circuit board on which the power transmission circuit 61 and control circuit 62 are mounted, or they may be part of the power transmission circuit 61 or control circuit 62.

[0041] The control circuit 62 exclusively activates one of the switches SW1 or SW2 depending on the power transmission mode.

[0042] In EPP mode, switch SW1 is turned ON and switch SW2 is turned OFF to connect the series circuit of the outer periphery 110 of the second coil 200 and the first coil 100 to the power transmission circuit 61. In this state, power is supplied from the power transmission circuit 61, and power transmission in EPP mode is performed using a portion of the second coil 200 and the first coil 100.

[0043] In MPP mode, switch SW1 is turned off and switch SW2 is turned on, connecting the entire first coil 100 to the power transmission circuit 61. In this state, power is supplied from the power transmission circuit 61, and power transmission in MPP mode using the first coil 100 is performed.

[0044] As described above, in this embodiment, the coil component 1 has a thinner thickness in the Z direction in the second region A2 than in the first region A1. Therefore, even when the magnet module 30 is located above the second coil 200, physical interference between the second coil 200 and the magnet module 30 can be prevented, and the reduction in magnetic coupling due to the presence of the magnet module 30 can be suppressed.

[0045] While embodiments of the technology described herein have been explained above, it goes without saying that the technology described herein is not limited to the embodiments described above, and various modifications are possible without departing from its spirit, and these modifications are also included within the scope of the technology described herein.

[0046] The technology relating to this disclosure includes, but is not limited to, the following configuration examples.

[0047] A coil component according to one embodiment of the present disclosure comprises a magnetic material having a plurality of regions whose positions in a planar direction perpendicular to the thickness direction are different from each other, and a first coil and a second coil facing one side surface of the magnetic material in the thickness direction, wherein the plurality of regions include a first region and a second region located outside the first region in the planar direction, the thickness of the second region of the magnetic material in the thickness direction is thinner than the thickness of the first region of the magnetic material in the thickness direction, the first coil is positioned to overlap with the first region of the magnetic material, and the second coil is positioned to overlap with the second region of the magnetic material. With this, it is possible to reduce the magnetic resistance of the magnetic flux passing through the magnetic material in both the case of using the first coil and the case of using the second coil. Moreover, since the second region of the magnetic material is thinner than the first region, it is possible to secure space above the second coil.

[0048] In the above coil component, the combined thickness of the second coil and the second region of the magnetic material in the thickness direction may be thinner than the thickness of the first region of the magnetic material in the thickness direction. This makes it possible to secure a larger space above the second coil.

[0049] In the above coil component, the second coil may be positioned in the thickness direction between one surface of the first region of the magnetic material in the thickness direction and one surface of the second region of the magnetic material in the thickness direction. This makes it possible to secure a larger space above the second coil.

[0050] In the above coil component, the magnetic material further includes a third region located between the first and second regions, and the thickness of the third region of the magnetic material in the thickness direction may be greater than the thickness of the first region of the magnetic material in the thickness direction. This makes it possible to secure space above the first region to accommodate the first coil when a housing or the like is fixed to the surface of the third region.

[0051] In the above coil component, the distance in the planar direction between the innermost turn of the second coil and the third region of the magnetic material may be greater than or equal to the distance in the planar direction between the outermost turn of the first coil and the third region of the magnetic material. This makes it possible to suppress characteristic variations caused by misalignment of the second coil.

[0052] In the above coil component, the magnetic material further includes a fourth region located inward in the planar direction from the first region, and the thickness of the fourth region of the magnetic material in the thickness direction may be greater than the thickness of the first region of the magnetic material in the thickness direction. This makes it possible to secure space above the first region to accommodate the first coil when a housing or the like is fixed to the surface of the fourth region.

[0053] In the above coil component, the distance in the planar direction between the innermost turn of the second coil and the third region of the magnetic material may be greater than or equal to the distance in the planar direction between the innermost turn of the first coil and the fourth region of the magnetic material. This makes it possible to suppress characteristic variations caused by misalignment of the second coil.

[0054] In the coil component described above, the surface on one side in the thickness direction of the third region may be located on one side in the thickness direction relative to the first coil. This makes it possible to prevent interference between the first coil and the housing even when a housing or the like is fixed to the surface of the third region.

[0055] In the above coil component, the magnetic material may be composed of ferrite. This makes it possible to obtain high inductance.

[0056] In the above-described coil components, both the first and second coils may have a configuration in which a conductor is wound around them. This makes it possible to reduce the resistance values ​​of the first and second coils.

[0057] In the above coil component, the wire diameter of the second coil may be smaller than that of the first coil. This allows for the creation of a larger space above the second coil and enables an increase in the number of turns of the second coil.

[0058] In the above-described coil component, the first coil has an outer circumference portion consisting of a predetermined number of turns including the outermost turn, and an inner circumference portion consisting of a predetermined number of turns including the innermost turn, and the winding directions of the first coil and the second coil from the outer end to the inner end are opposite to each other, and the second coil may be configured to be connectable to the inner end of the outer circumference portion of the first coil. This reduces the number of switches and enables two-mode selection operation in a simple manner.

[0059] In the above coil component, the number of turns of the second coil may be greater than the number of turns of the inner circumference of the first coil, and also greater than the number of turns of the outer circumference of the first coil. This makes it possible to suppress a decrease in magnetic coupling even if a misalignment occurs with the coil of the device being charged.

[0060] The above coil component further comprises a ring-shaped arrangement of magnet modules, and the second coil may have a portion that overlaps with the magnet modules when viewed from the thickness direction. This makes it possible to correctly position the charging device, such as a smartphone, in the planar direction.

[0061] In the above coil component, the second coil may have a portion located inside the inner surface of the magnet module when viewed in the thickness direction. This makes it possible to suppress magnetic loss of the second coil due to the presence of the magnet module.

[0062] A coil component according to another embodiment of the present disclosure comprises a coil and a magnet module arranged in an annular manner, wherein the coil has a portion that overlaps with the magnet module when viewed in the axial direction of the coil, and the coil and magnet module are spaced apart from each other. This makes it possible to suppress magnetic loss of the coil due to the presence of the magnet module.

[0063] A wireless power transmission device according to one embodiment of the present disclosure comprises one of the above-mentioned coil components and a power transmission circuit connected to the coil component. This makes it possible to provide a wireless power transmission device that conforms to multiple standards. [Explanation of Symbols]

[0064] 1,1A,1B coil components 10,10A,10B Magnetic material 11-14 Surface of magnetic material 15 slits 16 Adhesive layer 20 cabinets 21 Surface of the enclosure 22. Back of the enclosure 30 Magnet Modules 40 Electronic equipment 41 Power receiving coil 42 Magnets Terminals 51, 52, 54 53A~53C Lead wires 60 Wireless Power Transmission Devices 61 Power transmission circuit 62 Control circuits 100 First coil 101 Inner end of the first coil 102 Outer edge of the first coil 110 Outer periphery 111 Inner end of outer circumference 112 Outer edge of the outer part 120 Inner circumference 121 Inner end of inner circumference 122 Outer circumference end of the inner circumference 200 Second coil 201 Inner end of the second coil 202 Outer edge of the second coil SW1, SW2 switches

Claims

1. A magnetic material having multiple regions whose positions in a planar direction perpendicular to the thickness direction are different from each other, A first coil and a second coil facing one of the surfaces in the thickness direction of the magnetic material, Equipped with, The plurality of regions include a first region and a second region located outside the first region in the planar direction, The thickness of the second region of the magnetic material in the thickness direction is thinner than the thickness of the first region of the magnetic material in the thickness direction. The first coil is positioned in a location that overlaps with the first region of the magnetic material. The second coil is positioned in a location that overlaps with the second region of the magnetic material. Coil components.

2. The combined thickness of the second coil and the second region of the magnetic material in the thickness direction is thinner than the thickness of the first region of the magnetic material in the thickness direction. The coil component according to claim 1.

3. The second coil is located in the thickness direction between one surface of the first region of the magnetic material in the thickness direction and one surface of the second region of the magnetic material in the thickness direction. The coil component according to claim 1.

4. The magnetic material further includes a third region located between the first region and the second region. The thickness of the third region of the magnetic material in the thickness direction is greater than the thickness of the first region of the magnetic material in the thickness direction. The coil component according to claim 1.

5. The distance in the planar direction between the innermost turn of the second coil and the third region of the magnetic material is greater than or equal to the distance in the planar direction between the outermost turn of the first coil and the third region of the magnetic material. The coil component according to claim 4.

6. The magnetic material further includes a fourth region located inward in the planar direction from the first region. The thickness of the fourth region of the magnetic material in the thickness direction is greater than the thickness of the first region of the magnetic material in the thickness direction. The coil component according to claim 4.

7. The distance in the planar direction between the innermost turn of the second coil and the third region of the magnetic material is greater than or equal to the distance in the planar direction between the innermost turn of the first coil and the fourth region of the magnetic material. The coil component according to claim 6.

8. The surface of the third region on one side in the thickness direction is located on one side in the thickness direction of the first coil, The coil component according to claim 4.

9. The magnetic material is composed of ferrite. The coil component according to claim 1.

10. Both the first and second coils have a configuration in which a conductor is wound. The coil component according to claim 1.

11. The wire diameter of the second coil is smaller than the wire diameter of the first coil. The coil component according to claim 10.

12. The first coil has an outer circumference portion consisting of a predetermined number of turns including the outermost turn, and an inner circumference portion consisting of a predetermined number of turns including the innermost turn, The first coil and the second coil have winding directions that are opposite to each other, from the outer circumference to the inner circumference. The second coil is configured to be connectable to the inner end of the outer circumference of the first coil. The coil component according to claim 1.

13. The number of turns of the second coil is greater than the number of turns of the inner circumference of the first coil, and also greater than the number of turns of the outer circumference of the first coil. The coil component according to claim 12.

14. It further includes a ring-shaped arrangement of magnetic modules, The second coil has a portion that overlaps with the magnet module when viewed in the thickness direction. The coil component according to claim 1.

15. The second coil has a portion that, when viewed in the thickness direction, is located inside the inner surface of the magnet module. The coil component according to claim 14.

16. Coil and, It comprises a ring-shaped arrangement of magnet modules, The coil has a portion that overlaps with the magnet module when viewed from the axial direction of the coil. The coil and the magnet module are arranged spaced apart from each other. Coil components.

17. A coil component according to any one of claims 1 to 16, A power transmission circuit connected to the aforementioned coil component, A wireless power transmission device equipped with the following features.

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