Coil component, power transmission device, power reception device, power transmission system, and power transmission method

Abstract

A coil component (10) according to one embodiment includes: a first planar coil (11); a second planar coil (12) overlapping the first planar coil (11); and a holding body (30) which is a magnetic member having magnetism and including a portion covering a surface of the first planar coil (11) opposite to a surface facing the second planar coil (12). The first planar coil (11) and the second planar coil (12) are connected in series. The thickness of the second planar coil (12) is 0.15 mm or more and 0.35 mm or less.

Description

Technical Field

[0001] The present disclosure relates to a coil component, a power transmitting device, a power receiving device, a power transmission system, and a power transmission method. Background Art

[0002] Wireless power transmission systems that transmit power in a contactless manner are becoming popular.

[0003] In the case of non-contact power transmission, for example, a high-frequency current flows through a resonant circuit including a coil. In this case, a skin effect may occur in the coil. The skin effect increases AC resistance, resulting in an increase in power consumption due to heat generation. Therefore, the skin effect is the cause of reduced transmission efficiency.

[0004] When a twisted wire is used as a coil, the skin effect is suppressed. However, since the twisted wire is formed by twisting multiple enameled wires, the manufacturing cost is high and the manufacturing process takes time. As the size of the coil increases, the manufacturing process also takes time. On the other hand, it is known to use the following technology: a spiral and plate-shaped planar coil with a rectangular conductor cross-section (see JP2020-47614A). According to such a planar coil, the manufacturing efficiency can be improved regardless of the size of the coil. Therefore, this planar coil is suitable for large-power wireless power transmission systems such as electric vehicles where the size of the coil may increase.

[0005] In a wireless power transmission system for electric vehicles, a power transmission device is installed on a road surface such as a parking lot, and a power receiving device is installed in the electric vehicle. For example, when the above-mentioned planar coil is used due to the purpose of an electric vehicle, the height dimension of either the power transmission device or the power receiving device can be suppressed. Therefore, the above-mentioned planar coil plays a useful role in the field of vehicles where space is strictly limited. Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In devices such as power transmission devices and power reception devices that incorporate coils, it is generally desired to suppress the increase in size and weight. In this case, it is even more desired to suppress the increase in size and weight while achieving good transmission performance.

[0008] The technical problem of the present disclosure is to provide a coil component, a power transmitting device, a power receiving device, a power transmission system, and an efficient power transmission method capable of improving performance while suppressing an increase in size and weight.

[0009] Technical solutions for solving technical problems

[0010] The embodiments of the present disclosure are related to the following [1] to

[77] .

[0011] [1] A coil component comprising: a first planar coil;

[0012] a second planar coil overlapping the first planar coil;

[0013] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0014] The first planar coil and the second planar coil are connected in series, and a thickness of the second planar coil is greater than or equal to 0.15 mm and less than or equal to 0.35 mm.

[0015] [2] In the coil component described in [1], the first planar coil and the second planar coil are supplied with an alternating current of 79 kHz to 90 kHz, or an alternating magnetic field of 79 kHz to 90 kHz.

[0016] [3] The coil component according to [1] or [2], comprising: a first magnetic shielding member configured to face a surface of the covering portion of the magnetic member opposite to a surface facing the first planar coil;

[0017] a second magnetic shield member arranged to face a surface of the first magnetic shield member opposite to a surface facing the covering portion of the magnetic member;

[0018] The material of the first magnetic shield member and the material of the second magnetic shield member are different from each other.

[0019] [4] The coil component according to [3], wherein the volume resistivity of the first magnetic shielding member is greater than the volume resistivity of the second magnetic shielding member,

[0020] The relative magnetic permeability of the first magnetic shield member is greater than the relative magnetic permeability of the second magnetic shield member.

[0021] [5] In the coil component described in [3] or [4], the first magnetic shielding member includes a plate-like ferrite.

[0022] [6] In the coil component according to any one of [3] to [5], the first magnetic shielding member has a relative magnetic permeability of 500 or more.

[0023] [7] In the coil component according to any one of [3] to [6], the second magnetic shield member includes aluminum.

[0024] [8] In the coil component described in any one of [1] to [7], the covering portion of the magnetic component entirely covers the opposite surfaces of the first planar coil.

[0025] [9] In the coil component described in any one of [1] to [7], the covering portion of the magnetic component partially covers the opposite surface of the first planar coil.

[0026]

[10] In the coil component described in [9], the magnetic component includes a plurality of members separated from each other.

[0027]

[11] The coil component according to [9] or

[10] , wherein the first planar coil includes a straight portion extending along a straight line and a corner portion connected to the straight portion and extending in a curved shape,

[0028] The covering portion of the magnetic member covers the straight portion and does not cover the corner portion.

[0029]

[12] A power transmission device comprising the coil component according to any one of [1] to

[11] .

[0030]

[13] The power transmission device described in

[12] further includes a high-frequency current supply unit that supplies an alternating current of 79 kHz or more and 90 kHz or less to the coil component.

[0031]

[14] A power receiving device comprising the coil component according to any one of [1] to

[11] .

[0032]

[15] The power receiving device according to

[14] further includes a conversion unit that converts an alternating current of 79 kHz to 90 kHz generated by electromagnetic induction in the coil component into a direct current.

[0033]

[16] A power transmission system comprising a power transmission device and a power receiving device, wherein at least one of the power transmission device and the power receiving device comprises the coil component according to any one of [1] to

[11] .

[0034]

[17] A power transmission method comprising: supplying an alternating current of 79 kHz or more and 90 kHz or less to the coil component in a power transmission device including the coil component as described in any one of [1] to

[11] ;

[0035] a step of generating a current in a power receiving device based on the magnetic field generated in the power transmitting device.

[0036]

[18] A coil component comprising: a first planar coil;

[0037] a second planar coil overlapping the first planar coil;

[0038] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0039] The first planar coil and the second planar coil are connected in series,

[0040] The thickness of the second planar coil is greater than or equal to 0.225 mm and less than or equal to 0.275 mm.

[0041] The first planar coil and the second planar coil are supplied with an alternating current of 100 KHz or more and less than 200 KHz, or are supplied with an alternating magnetic field of 100 KHz or more and less than 200 KHz.

[0042]

[19] A coil component comprising: a first planar coil;

[0043] a second planar coil overlapping the first planar coil;

[0044] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0045] The first planar coil and the second planar coil are connected in series,

[0046] The thickness of the second planar coil is greater than or equal to 0.075 mm and less than or equal to 0.175 mm.

[0047] The first planar coil and the second planar coil are supplied with an alternating current of 200 KHz to 1 MHz or an alternating magnetic field of 200 KHz to 1 MHz.

[0048]

[20] A coil component comprising: a first planar coil;

[0049] a second planar coil overlapping the first planar coil;

[0050] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0051] The first planar coil and the second planar coil are connected in series,

[0052] The thickness of the second planar coil is greater than 0.45 mm.

[0053] The first planar coil and the second planar coil are supplied with an alternating current of 1.1 MHz or higher, or with an alternating magnetic field of 1.1 MHz or higher.

[0054]

[21] A coil component comprising: a first planar coil;

[0055] a second planar coil overlapping the first planar coil;

[0056] a holding body including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0057] a magnetic shielding member arranged to face a surface of the holding body opposite to a surface facing the first planar coil;

[0058] The first planar coil and the second planar coil are connected in series, and a thickness of the second planar coil is greater than or equal to 0.15 mm and less than or equal to 0.35 mm.

[0059]

[22] In the coil component described in

[21] , the first planar coil and the second planar coil are supplied with an AC current of 79 kHz to 90 kHz, or are supplied with an AC magnetic field of 79 kHz to 90 kHz.

[0060]

[23] In the coil component described in

[21] or

[22] , the thickness of the first planar coil is greater than or equal to 0.1 mm and less than or equal to 1.0 mm.

[0061]

[24] In the coil component described in any one of

[21] to

[23] , the first planar coil and the second planar coil overlap with each other with a gap therebetween, and the gap is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0062]

[25] A coil component as described in any one of

[21] to

[24] , wherein the retaining body integrally retains the first planar coil and the second planar coil in a state where the first planar coil and the second planar coil overlap with a gap therebetween, and the retaining body also includes a portion covering a side surface of the first planar coil and a portion filling the gap.

[0063]

[26] In the coil component described in any one of

[21] to

[25] , the retaining body includes a resin and magnetic particles retained by the resin.

[0064]

[27] In the coil component described in any one of

[21] to

[26] , the relative magnetic permeability of the retaining body is greater than or equal to 5.0.

[0065]

[28] In the coil component described in any one of

[21] to

[27] , the retaining body includes a wall portion protruding from the second planar coil.

[0066]

[29] The coil component according to any one of

[21] to

[28] , wherein the magnetic shielding component includes a plate-like ferrite.

[0067]

[30] The coil component according to any one of

[21] to

[29] , wherein the relative magnetic permeability of the magnetic shielding component is 500 or more.

[0068]

[31] In the coil component as described in any one of

[21] to

[30] , the first planar coil and the second planar coil respectively include a plurality of turns arranged in a direction orthogonal to their respective center axes, any one of the plurality of turns of the first planar coil and any one of the plurality of turns of the second planar coil partially overlap in the axial direction of the first planar coil, and a portion of the turns of the first planar coil and a portion of the turns of the second planar coil that overlap in the axial direction of the first planar coil extend parallel to each other.

[0069]

[32] In the coil component described in any one of

[21] to

[31] , the material of the first planar coil is the same as the material of the second planar coil.

[0070]

[33] In the coil component described in any one of

[21] to

[32] , the number of turns of the first planar coil and the number of turns of the second planar coil are greater than or equal to 4 and less than or equal to 12.

[0071]

[34] In the coil component described in any one of

[21] to

[33] , the first planar coil and the second planar coil are sized to be accommodated in a square with a side length of 800 mm.

[0072]

[35] A coil component as described in any one of

[21] to

[34] , further comprising an even number of other planar coils arranged between the first planar coil and the second planar coil, wherein the first planar coil, the other planar coils and the second planar coil are connected in series, and the thickness of the planar coil connected to the first planar coil among the other planar coils and the planar coil different from the first planar coil, at least the different planar coil, is greater than 0.15 mm and less than 0.35 mm.

[0073]

[36] In the coil component described in

[25] , the thickness of the planar coil connected to the first planar coil among the other planar coils is also greater than 0.15 mm and less than 0.35 mm.

[0074]

[37] A power transmission device comprising the coil component described in any one of

[21] to

[36] .

[0075]

[38] The power transmission device as described in

[37] further includes a high-frequency current supply unit, which supplies an alternating current of 79 kHz or more and 90 kHz or less to the coil component.

[0076]

[39] A power receiving device comprising the coil component according to any one of

[21] to

[36] .

[0077]

[40] The power receiving device according to

[39] further includes a conversion unit that converts an alternating current of 79 kHz to 90 kHz generated by electromagnetic induction in the coil component into a direct current.

[0078]

[41] A power transmission system comprising a power transmitting device and a power receiving device, wherein at least one of the power transmitting device and the power receiving device comprises the coil component according to any one of

[21] to

[36] .

[0079]

[42] A power transmission method comprising: a process of supplying an alternating current of 79 kHz or more and 90 kHz or less to a coil component in a power transmission device having the coil component described in any one of

[21] to

[36] ; and a process of receiving a magnetic field generated in the power transmission device using a power receiving device.

[0080]

[43] A coil component comprising: a first planar coil;

[0081] a second planar coil overlapping the first planar coil;

[0082] a holding body including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil, having magnetism, and holding at least the first planar coil;

[0083] a magnetic shielding member arranged to face a surface of the covering portion of the holding body opposite to a surface facing the first planar coil;

[0084] The first planar coil and the second planar coil are connected in series,

[0085] The first planar coil comprises aluminum,

[0086] The second planar coil has a thickness of 0.15 mm or more and 0.35 mm or less.

[0087]

[44] In the coil component described in

[43] , the thickness of the first planar coil is greater than the thickness of the second planar coil.

[0088]

[45] In the coil component described in

[43] or

[44] , the specific gravity of the second planar coil is greater than the specific gravity of the first planar coil, and the electrical conductivity of the second planar coil is greater than the electrical conductivity of the first planar coil.

[0089]

[46] In the coil component described in any one of

[43] to

[45] , the second planar coil includes copper.

[0090]

[47] In the coil component described in any one of

[43] to

[46] , the first planar coil and the second planar coil are supplied with an alternating current of 79 kHz to 90 kHz, or are supplied with an alternating magnetic field of 79 kHz to 90 kHz.

[0091]

[48] ​​In the coil component described in

[43] to

[47] , the thickness of the first planar coil is greater than or equal to 0.5 mm and less than or equal to 1.0 mm.

[0092]

[49] In the coil component described in any one of

[43] to

[48] , the total weight per square meter of the first planar coil and the weight per square meter of the second planar coil is 5.0 kg / m 2 .

[0093]

[50] The coil component as described in any one of

[43] to

[49] , wherein the holding body integrally holds the first planar coil and the second planar coil in a state where the first planar coil and the second planar coil overlap with a gap therebetween,

[0094] The holding body further includes a portion covering a side surface of the first planar coil and a portion filling the gap.

[0095]

[51] In the coil component described in any one of

[43] to

[50] , the retaining body includes a resin and magnetic particles retained by the resin.

[0096]

[52] In the coil component described in any one of

[43] to

[51] , the relative magnetic permeability of the retaining body is greater than 5.0.

[0097]

[53] In the coil component described in any one of

[43] to

[52] , the retaining body includes a wall portion protruding from the second planar coil.

[0098]

[54] In the coil component described in any one of

[43] to

[53] , the magnetic shielding component includes a plate-like ferrite.

[0099]

[55] The coil component as described in any one of

[43] to

[54] , wherein the relative magnetic permeability of the magnetic shielding component is 500 or more.

[0100]

[56] The coil component as described in any one of

[43] to

[55] , further comprising an even number of other planar coils arranged between the first planar coil and the second planar coil,

[0101] The first planar coil, the other planar coils and the second planar coil are connected in series,

[0102] Of the other planar coils, the planar coil connected to the first planar coil and the planar coil different from the first planar coil have a thickness of at least the coil in the different plane of 0.15 mm to 0.35 mm.

[0103]

[57] In the coil component described in

[56] , the thickness of the planar coil connected to the first planar coil among the other planar coils is also greater than 0.15 mm and less than 0.35 mm.

[0104]

[58] A power transmission device comprising the coil component described in any one of

[43] to

[57] .

[0105]

[59] The power transmission device as described in

[58] further includes a high-frequency current supply unit, which supplies an alternating current of 79 kHz or more and 90 kHz or less to the coil component.

[0106]

[60] A power receiving device comprising the coil component described in any one of

[43] to

[57] .

[0107]

[61] The power receiving device according to

[60] further includes a conversion unit that converts an alternating current of 79 kHz to 90 kHz generated by electromagnetic induction in the coil component into a direct current.

[0108]

[62] A power transmission system comprising a power transmission device and a power receiving device,

[0109] At least one of the power transmitting device and the power receiving device includes the coil component described in any one of

[43] to

[57] .

[0110]

[63] A power transmission method comprising: supplying an alternating current of 79 kHz or more and 90 kHz or less to the coil component in a power transmission device having the coil component described in any one of

[43] to

[57] ;

[0111] A step of receiving the magnetic field generated in the power transmitting device using a power receiving device.

[0112]

[64] A coil component comprising: a first planar coil;

[0113] a second planar coil overlapping the first planar coil;

[0114] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0115] a magnetic shielding member arranged to face a surface of the covering portion of the magnetic member opposite to a surface facing the first planar coil;

[0116] The first planar coil and the second planar coil are connected in series,

[0117] The thickness of the second planar coil is greater than or equal to 0.225 mm and less than or equal to 0.275 mm.

[0118] The first planar coil and the second planar coil are supplied with an alternating current of 100 KHz or more and less than 200 KHz, or are supplied with an alternating magnetic field of 100 KHz or more and less than 200 KHz.

[0119]

[65] A coil component comprising: a first planar coil;

[0120] a second planar coil overlapping the first planar coil;

[0121] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0122] a magnetic shielding member arranged to face a surface of the covering portion of the magnetic member opposite to a surface facing the first planar coil;

[0123] The first planar coil and the second planar coil are connected in series,

[0124] The thickness of the second planar coil is greater than or equal to 0.075 mm and less than or equal to 0.175 mm.

[0125] The first planar coil and the second planar coil are supplied with an alternating current of 200 KHz to 1 MHz or an alternating magnetic field of 200 KHz to 1 MHz.

[0126]

[66] A coil component comprising: a first planar coil;

[0127] a second planar coil overlapping the first planar coil;

[0128] a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism;

[0129] a magnetic shielding member arranged to face a surface of the covering portion of the magnetic member opposite to a surface facing the first planar coil;

[0130] The first planar coil and the second planar coil are connected in series,

[0131] The thickness of the second planar coil is greater than 0.45 mm.

[0132] The first planar coil and the second planar coil are supplied with an alternating current of 1.1 MHz or higher, or with an alternating magnetic field of 1.1 MHz or higher.

[0133]

[67] In the coil component described in any one of

[64] to

[66] , the first planar coil includes copper or aluminum, and the second planar coil includes copper.

[0134]

[68] The coil component according to any one of

[64] to

[67] , wherein the magnetic component includes a resin and magnetic particles held by the resin.

[0135]

[69] The coil component as described in any one of

[64] to

[68] , wherein the relative magnetic permeability of the magnetic component is greater than 5.0.

[0136]

[70] In the coil component described in any one of

[64] to

[69] , the magnetic shielding component includes a plate-like ferrite.

[0137]

[71] In the coil component described in any one of

[64] to

[70] , the relative magnetic permeability of the magnetic shielding component is 500 or more.

[0138]

[72] A power transmission device comprising: the coil component described in any one of

[64] to

[71] ;

[0139] A high-frequency current supply unit supplies an alternating current to the coil component.

[0140]

[73] A power receiving device comprising: the coil component described in any one of

[64] to

[71] ;

[0141] A conversion unit converts an alternating current generated by electromagnetic induction in the coil component into a direct current.

[0142]

[74] A power transmission system comprising a power transmission device and a power receiving device,

[0143] At least one of the power transmitting device and the power receiving device includes the coil component described in any one of

[64] to

[71] .

[0144]

[75] A power transmission method comprising: supplying an alternating current of 100 kHz or more and less than 200 kHz to the coil component in a power transmission device having the coil component described in

[64] ;

[0145] a step of generating a current in a power receiving device based on the magnetic field generated in the power transmitting device.

[0146]

[76] A power transmission method comprising: supplying an alternating current of 200 kHz or more and 1 MHz or less to the coil component in a power transmission device having the coil component described in

[65] ;

[0147] a step of generating a current in a power receiving device based on the magnetic field generated in the power transmitting device.

[0148]

[77] A power transmission method comprising: supplying an alternating current of 1.1 MHz or higher to the coil component in a power transmission device having the coil component described in

[66] ;

[0149] a step of generating a current in a power receiving device based on the magnetic field generated in the power transmitting device.

[0150] Effects of the Invention

[0151] According to the present disclosure, it is possible to improve performance while suppressing an increase in size and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0152] Figure 1 FIG. 1 is a diagram schematically showing a wireless power transmission system to which a coil component according to one embodiment is applied.

[0153] Figure 2 This is a perspective view of a coil component according to one embodiment.

[0154] Figure 3 yes Figure 2 An exploded perspective view of the coil assembly is shown.

[0155] Figure 4 It is overlooking along Figure 2 A perspective view of a cross section of a coil component of line IV-IV.

[0156] Figure 5 It is along Figure 2 A cross-sectional view of the coil component of the IV-IV wire.

[0157] Figure 6 is a graph showing simulation results related to performance evaluation of a coil component.

[0158] Figure 7 is a graph showing simulation results related to performance evaluation of a coil component.

[0159] Figure 8 is a graph showing simulation results related to performance evaluation of a coil component.

[0160] Fig. 9 It is a cross-sectional view of a coil component according to another embodiment.

[0161] Fig.10 This is a cross-sectional view of a coil component according to still another embodiment.

[0162] Fig.11 It is a top view of a coil component according to still another embodiment.

[0163] Fig.12 It is along Fig.11 A cross-sectional view of the coil component taken along line XI-XI is shown.

[0164] Fig.13 This is a cross-sectional view of a coil component according to still another embodiment.

[0165] Fig.14 It is a top view of a coil component according to still another embodiment.

[0166] Fig.15 yes Fig.14 Bottom view of the coil assembly shown.

[0167] Fig.16 yes Fig.14 A cross-sectional view of the coil component is shown.

[0168] Fig.17 is shown for illustration Figures 2 to 5 A graph showing the relationship between the thickness and the resistance of the planar coil in the coil component of the illustrated embodiment.

[0169] Fig.18 is shown for illustration Figures 2 to 5 A graph showing the relationship between the thickness of the planar coil and the Q value in the coil component according to the embodiment shown. DETAILED DESCRIPTION

[0170] Hereinafter, each embodiment will be described with reference to the drawings.

[0171] It should be noted that in this specification, the terms "sheet", "film", "plate" and the like are not distinguished from each other simply based on the difference in name. Therefore, for example, "sheet" is a concept that also includes a member that can also be called a film or a plate.

[0172] Figure 1 Schematically shows the application use Figures 2 to 5 The wireless power transmission system S of the coil component 10 according to one embodiment described later. Figure 1 , a wireless power transmission system S (hereinafter referred to as the power transmission system S) is described.

[0173] <Wireless Power Transmission System>

[0174] The power transmission system S includes a power transmission device 1 and a power receiving device 2. The power transmission device 1 includes a coil component 10 and a high-frequency current supply unit 1A. The coil component 10 in the power transmission device 1 functions as a power transmission coil. The high-frequency current supply unit 1A supplies a high-frequency current to the coil component 10 as a power transmission coil.

[0175] The power receiving device 2 includes a coil component 10 and a conversion unit 2A. The coil component 10 in the power receiving device 2 functions as a power receiving coil. The conversion unit 2A shapes the high-frequency current generated in the coil component 10. The conversion unit 2A has a rectifier circuit that converts the high-frequency current into a direct current. The conversion unit 2A can be configured to include, for example, a full-wave rectifier circuit including a plurality of diodes and a smoothing capacitor.

[0176] In the present embodiment, each of the power transmission device 1 and the power receiving device 2 includes the coil component 10. However, the coil component 10 may be used only in one of the power transmission device 1 and the power receiving device 2, and a different type of coil component may be used in the other. In addition, it goes without saying that coil components of other embodiments described later that are different from the coil component 10 may be applied to the power transmission device 1 and / or the power receiving device 2.

[0177] When power is transmitted wirelessly (contactlessly) from the power transmission device 1 to the power receiving device 2, the power transmission device 1 supplies a high-frequency current of a specified frequency from the high-frequency current supply unit 1A to the coil component 10 serving as the power transmission coil. At this time, a magnetic field is generated in the coil component 10 by electromagnetic induction. Then, under the influence of the magnetic field, a high-frequency current is generated in the coil component 10 serving as the power receiving coil in the power receiving device 2. That is, the power receiving device 2 receives the magnetic field or is affected by the magnetic field, and causes a high-frequency current to flow through it by electromagnetic induction. The conversion unit 2A converts the high-frequency current into a direct current, and supplies the converted direct current to, for example, a battery not shown.

[0178] As an example, the coil component 10 of the embodiment described below is manufactured so that the performance is improved when supplied with an AC current of 75KHz or more and 100KHz or an AC magnetic field of 75KHz or more and 100KHz or less. In detail, the coil component 10 is manufactured so that the performance is particularly improved when supplied with an AC current of 79KHz or more and 90KHz or less, especially an AC current of 85KHz, or an AC magnetic field of 79KHz or more and 90KHz or less, especially an AC magnetic field of 85KHz. Therefore, the high-frequency current supply unit 1A, as an example, can supply an AC current of 75KHz or more and 100KHz or more, or an AC current of 79KHz or more and 90KHz or less, or an AC current of 85KHz, to correspond to the desired AC current for the coil component 10. In addition, the conversion unit 2A can convert an alternating current of 75KHz to 100KHz, or an alternating current of 79KHz or more and 90KHz or 85KHz generated by electromagnetic induction when an alternating magnetic field is supplied, into a direct current. It should be noted that, in the case where the coil components incorporated into the power transmission device 1 and the power receiving device 2 are configured to function appropriately in a frequency band different from the frequency bands exemplified above, the high-frequency current supply unit 1A and the conversion unit 2A are configured to be suitable for a frequency band different from the frequency bands exemplified above. For example, the high-frequency current supply unit 1A can be configured to supply an alternating current of 100KHz or more and 200KHz or less.

[0179] Figure 1 The power transmission system S shown adopts a magnetic field resonance method as a power transmission system. However, the coil component 10 of this embodiment can be used in a power transmission system of an electromagnetic induction method. In addition, the power transmission system S is configured as a system for wirelessly transmitting power to an electric vehicle. In this case, the power transmission device 1 is set on a road, a parking lot, etc. The power receiving device 2 is set in the electric vehicle.

[0180] However, the use of the power transmission system S is not limited to power transmission to electric vehicles. For example, the power transmission system S can be used for power transmission to flying objects such as drones or robots. In addition, the power transmission system S can be used for power transmission to submarines or detection robots in the sea. In addition, the use of the coil component 10 is not limited to wireless power transmission systems. For example, the coil component 10 can be used for transformers, DC-DC converters, antennas, etc.

[0181] <Coil Parts>

[0182] Next, the coil component 10 will be described. Figure 2 It is a perspective view of the coil component 10 . Figure 3 It is an exploded perspective view of the coil component 10 . Figure 4 It is overlooking along Figure 2 A perspective view of a cross section of the coil component 10 of the IV-IV wire. Figure 5 It is along Figure 2 4 is a cross-sectional view of the coil component 10 of the IV-IV wire.

[0183] like Figures 2 to 5 As shown, the coil component 10 includes a first planar coil 11, a second planar coil 12, a magnetic shielding component 20, a holding body 30, a first connecting terminal 51 and a second connecting terminal 52. Figure 3 In the figure, for the convenience of explanation, the retaining body 30 is divided into the first layer 31, the second layer 32, the third layer 33 and the wall portion 34. However, in reality, Figure 5 As shown, the first layer 31 , the second layer 32 , the third layer 33 and the wall portion 34 are seamlessly integrally formed.

[0184] The first planar coil 11 and the second planar coil 12 are connected in series and overlapped with a gap. The retainer 30 includes a portion ( Figure 3 as well as Figure 5 The magnetic shielding component 20 is configured to face the surface of the retaining body 30 (more precisely, the covering portion of the retaining body 30) opposite to the surface facing the first planar coil 11. The magnetic shielding component 20 also includes a portion covering the surface of the first planar coil 11 opposite to the surface facing the second planar coil 12. In detail, the magnetic shielding component 20 includes a portion covering the surface of the first planar coil 11 opposite to the surface facing the second planar coil 12 via the first layer 31 in the retaining body 30. It should be noted that the details of the first layer 31, the second layer 32, the third layer 33 and the wall portion 34 constituting the retaining body 30 will be described later.

[0185] (First Planar Coil and Second Planar Coil)

[0186] The first planar coil 11 has a spiral shape and is formed of a conductive material. In the present embodiment, the first planar coil 11 is formed of copper, but the first planar coil 11 can be formed of any conductive material and can also be formed of aluminum or the like. In addition, the first planar coil 11 is plate-shaped. Figure 4 as well as Figure 5 As shown, the cross-sectional shape of the first planar coil 11 in the direction orthogonal to the direction in which the first planar coil 11 is wound in a spiral shape is a rectangular shape.

[0187] Figure 2 as well as Figure 3The reference symbol C1 shown shows the first center axis of the first planar coil 11, which passes through the center of the spiral shape of the first planar coil 11. Hereinafter, when the axial direction of the first planar coil 11 is mentioned, the direction refers to the direction extending on the first center axis C1 or the direction parallel to the first center axis C1. In addition, the direction orthogonal to the first center axis C1 is referred to as the radial direction of the first planar coil 11.

[0188] The first planar coil 11 has a conductor 11E formed into a spiral shape by a plurality of turns 11n. The plurality of turns 11n of the first planar coil 11 are arranged in a direction orthogonal to the first center axis C1 of the spiral shape. Specifically, the plurality of turns 11n are connected in a manner that gradually moves away from the first center axis C1 of the spiral shape toward the radial outside. Then, a spiral shape is formed thereby.

[0189] The turn portion 11n is shaped as follows: the linear conductor portion is basically not formed into a ring shape but is surrounded by the first central axis C1 for 360 degrees. In the case of a so-called planar coil, both ends of the turn portion 11n are staggered in the radial direction. Among the plurality of turns 11n, the radially outer end of a turn portion 11n is connected to the radially inner end of another turn portion 11n, and the other turn portions 11n extend away from the first central axis C1.

[0190] Hereinafter, the turn portion closest to the first central axis C1 among the plurality of turns 11n is sometimes referred to as the turn portion 111. In addition, the turn portion connected to the turn portion 111 is sometimes referred to as the turn portion 112. In the present embodiment, the plurality of turns 11n is composed of seven turns 111 to 117. Hereinafter, when describing the common items of each of the plurality of turns 11n, they are basically referred to as the turn portion 11n.

[0191] In the present embodiment, the turn 11n is wound in a manner to form a rectangle. However, the turn 11n may also be shaped in a manner to form a circle. It should be noted that the spiral shape mentioned in this specification and the present disclosure refers to the shape of a plane curve wound in a spiral shape. The plane curve mentioned here also includes a plane pattern that is wound back and forth while bending in a broken line shape as shown in the figure. In addition, in other words, the spiral shape is a shape that is wound around the first center axis C1 of the first planar coil 11 in a manner that is gradually located on the outside.

[0192] The radially inner end of the turn portion 111 closest to the first central axis C1 (the end close to the first central axis C1 ) is electrically connected to the second planar coil 12 . Figure 2 as well as Figure 3The connecting wiring portion 14 shown is a conductor, and electrically connects the turn portion 111 and the second planar coil 12 in series. As an example, the connecting wiring portion 14 shown in the figure is formed integrally with the second planar coil 12. The connecting wiring portion 14 can be connected to the turn portion 111 by ultrasonic connection or the like. On the other hand, the radially outer end (the end away from the first center axis C1) of the turn portion 117 farthest from the first center axis C1 among the plurality of turns 11n is connected to the first connection terminal 51.

[0193] Here, the radial inner side of the first planar coil 11 (turn 11n) refers to the direction close to the first center axis C1 in the radial direction. In addition, the radial outer side of the first planar coil 11 (turn 11n) refers to the direction away from the first center axis C1 in the radial direction. In addition, in the present embodiment, the first center axis C1 is determined as follows. First, starting from the radial inner end of the innermost turn 111, linear virtual turns of a shape similar to the innermost turn 111 are drawn in sequence to form a spiral shape on the radial inner side. Then, continue drawing until a virtual turn with a diameter within 1 cm can be drawn. Then, a line passing through the radial inner area of ​​the virtual turn with a diameter within 1 cm in a direction orthogonal to the circumferential and radial directions of the spiral shape is determined as the first center axis C1.

[0194] As an example, the first planar coil 11 in the present embodiment is formed by punching out a copper plate into a spiral shape. However, the first planar coil 11 may be formed by etching a copper foil into a spiral shape.

[0195] The thickness of the first planar coil 11 (the thickness of the conductor 11E) can be, for example, not less than 0.1 mm and not more than 1.0 mm. In addition, the radius of the first planar coil 11 (the distance from the first center axis C1 to the most distant part in the radial direction) can be not less than 80 mm, or not less than 80 mm and not more than 450 mm. In addition, the aspect ratio of the first planar coil 11 (conductor 11E) having a rectangular cross-sectional shape is determined by dividing the radial width (width in the radial direction) of the first planar coil 11 (conductor 11E) by the thickness of the first planar coil 11 (conductor 11E). The aspect ratio of the first planar coil 11 (conductor 11E) can be not less than 2 and not more than 12, or not less than 3 and not more than 10.

[0196] In the case of transmitting power to an electric vehicle by means of magnetic field resonance, it is desirable to be able to transmit power of 1Kw or more, preferably 5Kw or more, in the frequency band of high-frequency current of 10KHz to 200KHz, especially 75KHz to 100KHz, and further 79KHz to 90KHz. In this case, the thickness of the first planar coil 11 formed of copper is preferably 0.2mm or more. In addition, when the thickness of the first planar coil 11 is too large, the weight increases, which is undesirable in, for example, a vehicle. Therefore, the thickness of the first planar coil 11 can be, for example, less than 2.0mm, less than 1.5mm, or less than 1.0mm. In addition, in the case of transmitting power to an electric vehicle, it is not desirable to be too large, so the size is sometimes limited. From this point of view, the first planar coil 11 and the second planar coil 12 described later, more specifically, the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 are preferably formed in a size that can be accommodated in a square with a side length of 800mm.

[0197] In addition, the line width of the first planar coil 11 (the line width of the conductor 11E), that is, the radial width (radial width) of each turn 11n is not particularly limited. However, considering that, for example, 1Kw or more, preferably 5Kw or more of power can be transmitted in the frequency band of high-frequency current of 79KHz to 90KHz, the radial width of the turn 11n can be 2mm or more and 20mm or less, or 2mm or more and 16mm or less, 2mm or more and 12mm or less, or 2mm or more and 8mm or less. In addition, the number of turns of the first planar coil 11 can be 4 or more and 12 or less, but there is no particular limitation.

[0198] Next, the second planar coil 12 is also in a spiral shape. In this embodiment, the second planar coil 12 is formed of copper. The material of the second planar coil 12 is not particularly limited and is the same material as the first planar coil 11. However, the material of the first planar coil 11 and the material of the second planar coil 12 may be different. In addition, the second planar coil 12 is also in a plate shape, such as Figure 4 as well as Figure 5 As shown, the cross-sectional shape of the second planar coil 12 in the direction orthogonal to the direction in which the second planar coil 12 is wound in a spiral shape is a rectangular shape.

[0199] Figure 2 as well as Figure 3The reference symbol C2 shown shows a second central axis passing through the second planar coil 12, which passes through the center of the spiral shape of the second planar coil 12. Hereinafter, when the axial direction of the second planar coil 12 is mentioned, the direction refers to a direction extending on the second central axis C2 or a direction parallel to the second central axis C2. In addition, the direction orthogonal to the second central axis C2 is referred to as the radial direction of the second planar coil 12.

[0200] In the present embodiment, the second planar coil 12 is configured to be coaxial with the first planar coil 11. That is, the first center axis C1 of the first planar coil 11 is consistent with the second center axis C2 of the second planar coil 12, in other words, they are located on the same straight line. However, the first planar coil 11 and the second planar coil 12 may also overlap in such a way that the first center axis C1 of the first planar coil 11 and the second center axis C2 of the second planar coil 12 are parallel to each other. That is, the first planar coil 11 and the second planar coil 12 may not be coaxial.

[0201] The second planar coil 12 also has a conductor 12E formed into a spiral shape by a plurality of turns 12n. The plurality of turns 12n of the second planar coil 12 are arranged in a direction orthogonal to the second central axis C2 of the spiral shape.

[0202] The connection method of the plurality of turns 12n and the names corresponding to the positions (turns 121, etc.) are the same as those of the turns 11n of the first planar coil 11. In the present embodiment, the number of turns of the first planar coil 11 is the same as the number of turns of the second planar coil 12, and the plurality of turns 12n is composed of seven turns 121 to 127. In addition, similarly to the turns 11n, the turns 12n are surrounded in a rectangular manner. It should be noted that the turns 11n may also be shaped so as to be surrounded in a circular manner. In addition, the number of turns of the first planar coil 11 may be different from the number of turns of the second planar coil 12. In addition, for example, the turns 12n may be rectangular and the turns 12n may be circular.

[0203] In addition, if Figure 4 As shown, in the present embodiment, any one of the plurality of turns 11n of the first planar coil 11 and any one of the plurality of turns 12n of the second planar coil 12 partially overlap in the axial direction of the first planar coil 11. Moreover, a portion of the turns 11n of the first planar coil 11 and a portion of the turns 12n of the second planar coil 12 overlapped in the axial direction of the first planar coil 11 extend parallel to each other in a state along the winding direction. The state along the winding direction refers to a state in which the winding direction of the first planar coil 11 and the winding direction of the second planar coil 12 do not intersect at a point, but overlap on the same straight line for a certain distance.

[0204] As described above, the length of a portion of the turns 11n of the first planar coil 11 and the length of a portion of the turns 12n of the second planar coil 12, which overlap and extend parallel to each other, can be greater than 1 / 2 or greater than 3 / 4 of their respective total lengths. The inventors of the present application have found that the greater the ratio of overlap between the first planar coil 11 and the second planar coil 12 while extending parallel to each other, the more eddy current loss can be suppressed.

[0205] In addition, as described above, the radially inner end of the turn 111 closest to the first center axis C1 is electrically connected to the second planar coil 12. In detail, the radially inner end of the turn 111 is connected to the inner end of the turn 121 in the second planar coil 12 via the connecting wiring portion 14. Here, when the first planar coil 11 is connected to the second planar coil 12, the direction in which the first planar coil 11 is wound from the end not connected to the second planar coil 12 (the radially outer end of the turn 117) to the end connected to the second planar coil 12 is the same as the direction in which the second planar coil 12 is wound from the end connected to the first planar coil 11 to the end not connected to the first planar coil 11 (the radially outer end of the turn 127).

[0206] The radially outer end of the turn 127 farthest from the second center axis C2 among the multiple turns 12n is connected to the second connection terminal 52. It should be noted that the directions indicated by the radial inner and outer sides of the second planar coil 12 (turns 12n) are determined in the same way as the radial inner and outer sides of the above-mentioned first planar coil 11. In addition, the method for determining the position of the second center axis C2 is also determined in the same way as the case of the first center axis C1. In addition, as an example, the second planar coil 12 in the present embodiment is also formed by punching out a spiral shape from a copper plate. However, the second planar coil 12 can also be formed by etching a copper foil into a spiral shape.

[0207] In the present embodiment, the thickness of the second planar coil 12 (the thickness of the conductor 12E) is smaller than the thickness of the first planar coil 11. Furthermore, the thickness of the second planar coil 12 is greater than or equal to 0.15 mm and less than or equal to 0.35 mm.

[0208] The inventors of the present application have discovered that, when the first planar coil 11 and the second planar coil 12 overlap on the magnetic shielding component 20 and the retaining body 30, by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved. Therefore, the thickness of the second planar coil 12 is set to be greater than 0.15 mm and less than 0.35 mm. The above-mentioned specified frequency band is the frequency band of the energized alternating current, specifically greater than 75 KHz and less than 100 KHz, and the performance of the coil component 10 is extremely significantly improved when it is greater than 79 KHz and less than 90 KHz. It should be noted that when used in a frequency band different from that of greater than 75 KHz and less than 100 KHz, the preferred thickness of the second planar coil 12 changes.

[0209] In addition, similarly to the case of the first planar coil 11, the radius of the second planar coil 12 (the distance from the second central axis C2 to the most distant part in the radial direction) can be 80 mm or more, or 80 mm or more and 450 mm or less. In addition, similarly to the case of the first planar coil 11, the aspect ratio of the second planar coil 12 (conductor 12E) having a rectangular cross-sectional shape can be 2 or more and 12 or 3 or more and 10 or less. In addition, the line width of the second planar coil 12 (line width of the conductor 12E), that is, the radial width (width in the radial direction) of each turn portion 12n can be 2 mm or more and 20 mm or less, or 2 mm or more and 16 mm or less, 2 mm or more and 12 mm or less, or 2 mm or more and 8 mm or less. In addition, the number of turns of the second planar coil 12 can be 4 or more and 12 or less, but there is no particular limitation.

[0210] In addition, the first planar coil 11 overlaps with the second planar coil 12 with a gap therebetween. The gap may be greater than 0.5 mm and less than 1.5 mm. There is no particular limitation on the gap, but when the gap is too small, the eddy current loss generated in the first planar coil 11 and the second planar coil 12 tends to increase when current is supplied. In addition, when the gap becomes too large, the thinness of the coil component 10 is destroyed.

[0211] It should be noted that the inventors of the present application have confirmed through experiments and simulations that by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved under at least the following conditions: the radial width of the turns 11n and 12n (2mm to 20mm) and the number of turns (4 to 12) of the first planar coil 11 and the second planar coil 12 as shown in the above examples. However, the present disclosure is not limited to the conditions exemplified in the embodiments. That is, by, for example, setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved, which can occur without being restricted by size or number of turns.

[0212] (Magnetic shielding components)

[0213] A magnetic shielding component 20 is provided to suppress magnetic penetration and / or leakage magnetic fields. The magnetic shielding component 20 is a sheet-like component that is separated from the first planar coil 11, the second planar coil 12, and the retaining body 30. The magnetic shielding component 20 is separated from the first planar coil 11, the second planar coil 12, and the retaining body 30, which means that the magnetic shielding component 20 is not integrated with these first planar coil 11, the second planar coil 12, and the retaining body 30. However, the magnetic shielding component 20 and the retaining body 30 can be joined via an adhesive layer or the like. The magnetic shielding component 20 is formed to a size that includes the first planar coil 11 and the second planar coil 12 when viewed from above. The magnetic shielding component 20 overlaps with the first planar coil 11, the second planar coil 12, and the retaining body 30, and is in direct contact with the retaining body 30 therein.

[0214] The magnetic shielding component 20 in this embodiment has magnetism and includes magnetic material or is made of magnetic material. In the coil component 10, when current is supplied to the first planar coil 11 and the second planar coil 12, a magnetic field is generated. Such a magnetic field generated in the coil component 10 extends in all directions relative to the center axes C1 and C2 of the first planar coil 11 and the second planar coil 12. At this time, since the magnetic shielding component 20 has magnetism, the magnetic flux lines that are trying to expand can be oriented toward the sides of the center axes C1 and C2. In addition, although the coil component 10 can be set in a vehicle, at this time, if the magnetic field generated in the coil component 10 flows to the side of other vehicle components, it may have an adverse effect on the vehicle components. In such a case, the magnetic shielding component 20 can suppress the leakage magnetic field that does not contribute to the generation of current.

[0215] The magnetic shielding member 20 preferably includes a soft magnetic material or a nanocrystalline magnetic material. More specifically, the magnetic shielding member 20 includes ferrite, preferably soft ferrite. In the present embodiment, the magnetic shielding member 20 includes plate-shaped ferrite. More specifically, the magnetic shielding member 20 is formed by arranging a plurality of plate-shaped ferrites in a sheet shape.

[0216] The relative magnetic permeability of the magnetic shielding member 20 may be 500 or more, or 1000 or more. The relative magnetic permeability of the magnetic shielding member 20 may be 500 or more and 3000 or more, or 1000 or more and 3000 or less. It should be noted that the relative magnetic permeability in this specification is a value measured at a frequency of 85 kHz and an ambient temperature of 23°C.

[0217] (Holding body, magnetic parts)

[0218] like Figure 4 as well as Figure 5 As shown, the holding body 30 integrally holds the first planar coil 11 and the second planar coil 12. Moreover, the holding body 30 covers the surface 111A of the first planar coil 11 that faces the second planar coil 12 and the surface 111B opposite to the surface 111A, and fills the gap between the first planar coil 11 and the second planar coil 12. Moreover, the holding body 30 covers the surface 121B of the second planar coil 12 that faces the first planar coil 11 by filling the gap between the first planar coil 11 and the second planar coil 12.

[0219] On the other hand, the retaining body 30 does not cover the surface 121A of the second planar coil 12 that is opposite to the surface 121B facing the first planar coil 11. In addition, the retaining body 30 includes a wall portion 34 that protrudes from the second planar coil 12 in the axial direction of the second planar coil 12. When viewed in the axial direction of the second planar coil 12, the wall portion 34 is a spiral shape (spiral shape) and extends along the second planar coil 12.

[0220] exist Figure 3 As described above, for convenience of explanation, the retainer 30 is shown divided into the first layer 31, the second layer 32, the third layer 33 and the wall 34. In this embodiment, the retainer 30 includes the first layer 31, the second layer 32, the third layer 33 and the wall 34 which are substantially seamlessly formed integrally.

[0221] When viewed in the axial direction of the first planar coil 11 and the second planar coil 12, the first layer 31, the second layer 32, and the third layer 33 are formed to include the entire first planar coil 11 and the second planar coil 12. The first layer 31 is a portion that covers the surface 111B of the first planar coil 11 opposite to the surface 111A facing the second planar coil 12 and the side surface of the first planar coil 11. Moreover, the first layer 31 is a portion that contacts the magnetic shielding member 20. The second layer 32 is a portion sandwiched between the first planar coil 11 and the second planar coil 12. That is, the second layer 32 is a portion that fills the gap between the first planar coil 11 and the second planar coil 12. The third layer 33 is a portion that covers the side surface of the second planar coil 12. In other words, the third layer 33 is a portion that covers the entire side surface of the second planar coil 12 from the inner side and the outer side in the radial direction. Moreover, the surface of the third layer 33 opposite to the surface connected to the second layer 32 is flush with the surface 121A of the second planar coil 12. Furthermore, the wall portion 34 protrudes from the surface of the third layer 33 which is flush with the surface 121A of the second planar coil 12 .

[0222] The retaining body 30 has magnetism as a whole, that is, each of the first layer 31, the second layer 32, the third layer 33 and the wall portion 34 has magnetism. The retaining body 30 suppresses eddy current loss and leakage flux through magnetism, or improves the coil performance by increasing the coupling coefficient. The relative magnetic permeability of the retaining body 30 is preferably greater than 2.0, and may be greater than 2.0 and less than 10.0. The relative magnetic permeability of the retaining body 30 is preferably greater than 5.0, and may be greater than 5.0 and less than 10.0. There is no particular limitation on the relative magnetic permeability of the retaining body 30, but when the relative magnetic permeability is too large, the flexibility and strength of the retaining body 30 may be undesirably damaged. Therefore, the relative magnetic permeability of the retaining body 30 may be less than 200.

[0223] In addition, the retaining body 30 includes a wall portion 34, which can effectively improve the coil performance. The height of the wall portion 34 is not particularly limited, and can be, for example, greater than 0.5 mm, or greater than 1.0 mm. There is a tendency that the higher the height of the wall portion 34, the higher the effect of suppressing eddy current loss and the higher the coupling coefficient. On the other hand, there is a tendency that the higher the wall portion 34 becomes, the easier it is to break starting from the root. Therefore, the height of the wall portion 34 can be set to, for example, less than 10 mm. It should be noted that the wall portion 34 may not be provided.

[0224] As an example, the retainer 30 in this embodiment includes a resin and a plurality of or a large number of magnetic particles made of a magnetic material. The magnetic particles are retained by the resin as the retaining material. The resin contained in the retainer 30 has insulating properties. Insulating properties refer to a volume resistivity of 10 10 Ωm or above.

[0225] The magnetic particles can be formed by any one or more of ferrite, in particular, soft magnetic material ferrite, nanocrystalline magnetic material, silicon steel, electromagnetic soft iron and amorphous metal. The resin used as the holding material can be glass fiber reinforced polyamide. That is, the resin can be formed by a material including polyamide and glass fiber as a thermoplastic resin (thermoplastic material). However, the forming material of the holding body 30 is not particularly limited.

[0226] (Connection terminal)

[0227] like Figure 2 as well as Figure 3 As shown, the first connection terminal 51 is connected to the radially outer end of the turn 117 in the first planar coil 11. The second connection terminal 52 is connected to the radially outer end of the turn 127 in the second planar coil 12. The first connection terminal 51 and the second connection terminal 52 can be used, for example, when connecting to the high-frequency current supply unit 1A or the conversion unit 2A. The connection between the first connection terminal 51 and the turn 117 and the connection between the second connection terminal 52 and the turn 127 can be performed by ultrasonic bonding. However, the connection method is not limited, and for example, a connection using a conductive adhesive can be used.

[0228] <Performance Evaluation Simulation of Coil Component 10>

[0229] Hereinafter, a calculation simulation of the Q value performed by setting a plurality of values ​​for the thickness of the first planar coil 11 and the thickness of the second planar coil 12 in the coil component 10 of the present embodiment will be described. The simulation was performed using Femtet (registered trademark) manufactured by Murata Software Co., Ltd.

[0230] The simulation conditions are shown in the following two modes (1) and (2).

[0231] (1) In the coil component 10 in the above embodiment, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12, and the Q values ​​corresponding to the respective values ​​are calculated.

[0232] (2) In the coil component 10 of the above embodiment, when the wall portion 34 is not formed in the holder 30, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12, and the corresponding Q values ​​are calculated.

[0233] The conditions common to modes (1) and (2) are as follows.

[0234] The high-frequency current supplied is 40A and the frequency is 85KHz.

[0235] The electrical conductivity of the first planar coil 11 and the second planar coil 12 formed of copper is 6.45×107 [S / m].

[0236] The relative magnetic permeability of the magnetic shield member 20 is 3000, and the relative magnetic permeability of the holding body 30 is 5.0.

[0237] · Figure 2 The width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the IV-IV line direction is 200 mm, and the width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction orthogonal to the IV-IV line is 200 mm.

[0238] The results of the above simulation (1) are shown in the following Table 1. In the vertical column on the left side of Table 1, multiple values ​​of the thickness of the first planar coil 11 are shown. In the horizontal column on the upper side of Table 1, multiple values ​​of the thickness of the second planar coil 12 are shown. In addition, in the table, the Q value corresponding to the combination of the thickness of the first planar coil 11 and the thickness of the second planar coil 12 is shown. It should be noted that the portion marked with "*1" in the vertical column on the left side shows that the size of the gap between the first planar coil 11 and the second planar coil 12 is 1.0 mm. The size of the gap between the first planar coil 11 and the second planar coil 12 in the portion not marked with "*1" is 0.5 mm.

[0239] [Table 1]

[0240]

[0241] As described above, the inventors of the present application have discovered that, when the first planar coil 11 and the second planar coil 12 overlap on the magnetic shielding component 20 and the retaining body 30, by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved. In detail, it was found that when used in a specified frequency band, when the thickness of the second planar coil overlapping the first planar coil 11 is set to any one between greater than 0.15 mm and less than 0.35 mm, a maximum value of the Q value of the coil component 10 is generated. The above-mentioned specified frequency band is specifically a frequency band greater than 75 KHz and less than 100 KHz. When it is greater than 79 KHz and less than 90 KHz, the performance of the coil component 10 is reliably improved.

[0242] In the simulation results shown in Table 1, for example, when the thickness of the first planar coil 11 is fixed at 0.5 mm and the gap between the first planar coil 11 and the second planar coil 12 is fixed at 0.5 mm, the Q value tends to increase as the thickness of the second planar coil 12 decreases from 0.5 mm, and tends to decrease below 0.15 mm. It can be understood that the maximum value of the Q value occurs when the thickness of the second planar coil 12 is between 0.2 and 0.275 mm. Figure 6 is a graph showing the simulation results under this condition. Figure 6 In the figure, the Q value is plotted against the thickness. Figure 6 , it can be seen that there is the following setting: between 0.2 and 0.275 mm, the maximum value of Q value is produced.

[0243] In addition, when the results of Table 1 are examined, when the thickness of the second planar coil 12 is between 0.2 and 0.3 mm, a higher Q value (about 170 to 210) can be obtained regardless of the thickness of the first planar coil 11. Here, in the case where the thickness of the second planar coil 12 is increased by about 20% from 0.3 mm or reduced by about 20% from 0.2 mm, it is also estimated that the desired performance can be obtained in consideration of the simulation results. Specifically, the Q value when the thickness of the second planar coil 12 is 0.15 mm is 160.4, which is a relatively high value. In addition, it can be seen that when the thickness of the second planar coil 12 becomes too small, the Q value decreases. Considering such a downward trend, manufacturing and handling viewpoints, it is estimated that the thickness of the second planar coil 12 is preferably greater than 0.15 mm.

[0244] The above simulation results confirm that by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved. It should be noted that the thickness of the second planar coil 12 can be greater than 0.20 mm and less than 0.275 mm, or can be greater than 0.225 mm and less than 0.275 mm. In these cases, the coil performance can be more reliably improved.

[0245] In addition, the Q value in the case where "the thickness of the first planar coil 11 is 0.5 mm, the thickness of the second planar coil 12 is 0.25 mm, and the gap between the first planar coil 11 and the second planar coil 12 is 1.0 mm" is 204.8. In contrast, the Q value in the case where "the thickness of the first planar coil 11 is 0.5 mm, the thickness of the second planar coil 12 is 0.25 mm, and the gap between the first planar coil 11 and the second planar coil 12 is 0.5 mm" is 196.1. From this result, it can be inferred that there is a tendency that the larger the gap, the higher the performance. It is inferred that the reason for the phenomenon of performance degradation when the gap becomes smaller is that the eddy current loss increases due to the influence of the proximity effect. However, when the gap becomes too large, it will hinder thinning. Therefore, the expected value of the gap can be, for example, greater than 0.5 mm and less than 1.5 mm.

[0246] In addition, in the simulation shown in Table 1, when the thickness of the second planar coil 12 is fixed at 0.25 mm and the thickness of the first planar coil 11 is changed, there is a tendency that the thicker the first planar coil 11 is, the larger the Q value is. This is considered to be because the greater the copper thickness (the thickness of the first planar coil 11), the lower the resistance, but it is saturated at a thickness of about 1 mm, and no significant improvement is seen even if it is thickened. On the other hand, even if the thickness of the first planar coil 11 is reduced to about 0.25 mm, a sufficiently large Q value can be obtained compared to any condition in which the first planar coil is thickened to about 0.5 mm. It is inferred that a higher Q value can be obtained even if the thickness of the first planar coil 11 is about 0.1 mm. Therefore, considering the weight and economy of the coil component, the thickness of the first planar coil 11 can be appropriately set, preferably with a thickness of 0.1 mm or more.

[0247] Next, the results of the above-mentioned simulation (2) are shown in the following Table 2. In Table 2, similarly to Table 1, the relationship between the thickness and the Q value is shown.

[0248] [Table 2]

[0249]

[0250] In the simulation results shown in Table 2, for example, when the thickness of the first planar coil 11 is fixed at 0.5 mm and the gap between the first planar coil 11 and the second planar coil 12 is fixed at 0.5 mm, the Q value increases as the thickness of the second planar coil 12 decreases. Moreover, it can be understood that the maximum value of the Q value occurs between the conditions where the thickness of the second planar coil 12 is 0.2 to 0.3 mm. In addition, when the thickness of the second planar coil 12 is 0.2 to 0.3 mm, a high Q value (above 115) can be obtained regardless of the thickness of the first planar coil 11. Here, in consideration of the simulation results, it is also estimated that the desired performance can be obtained when the thickness of the second planar coil 12 is increased by about 20% from 0.3 mm or when it is reduced by about 20% from 0.2 mm.

[0251] The above simulation results also confirm that by setting the thickness of the second planar coil 12 to 0.15 mm or more and 0.35 mm or less, the performance of the coil component 10 when used in a predetermined frequency band is significantly improved.

[0252] Table 3 below shows simulation results when the frequency of the supplied current is changed from 85 KHz to 79 KHz and 90 KHz under the simulation conditions of (1) above.

[0253] [Table 3]

[0254]

[0255] The simulation results in Table 3 confirm that even when the frequency of the supplied current is 79 kHz and 90 kHz, the performance of the coil component 10 is significantly improved by setting the thickness of the second planar coil 12 to 0.15 mm or more and 0.35 mm or less.

[0256] In this simulation, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12 in the coil component 10 in the above-described embodiment, and the Q values ​​corresponding to the values ​​are calculated.

[0257] In this simulation, Figure 2The width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction of the IV-IV line shown is 326 mm, and the width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction orthogonal to the IV-IV line is 326 mm. The other conditions are the same as the above simulation. Then, the thickness of the first planar coil 11 is fixed at 0.5 mm, and the Q value is simulated when the thickness of the second planar coil 12 is 0.5 mm, 0.35 mm, 0.25 mm, and 0.2 mm. The simulation results are shown in Table 4 below.

[0258] [Table 4]

[0259]

[0260] It can also be confirmed and estimated from the simulation results shown in Table 4 that the performance of the coil component 10 can be significantly improved by setting the thickness of the second planar coil 12 to 0.15 mm or more and 0.35 mm or less.

[0261] Next, another simulation will be described. In this simulation, similar to the simulation whose results are shown in Tables 1 and 2, the simulation was performed using the following two modes (1) and (2).

[0262] (1) In the coil component 10 in the above embodiment, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12, and the Q values ​​corresponding to the respective values ​​are calculated.

[0263] (2) In the coil component 10 of the above embodiment, when the wall portion 34 is not formed in the holder 30, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12, and the corresponding Q values ​​are calculated.

[0264] However, in this simulation, Figure 2 The width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction of the IV-IV line is 470 mm, and the width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction orthogonal to the IV-IV line is 570 mm. The other specific conditions are the same as those in the above simulation.

[0265] Moreover, for mode (1), the thickness of the first planar coil 11 is fixed at 0.5 mm, and the Q values ​​when the thickness of the second planar coil 12 is 0.5 mm, 0.35 mm, 0.25 mm, and 0.15 mm are simulated. The simulation results of mode (1) are shown in Table 5 below. For mode (2), the thickness of the first planar coil 11 is fixed at 0.5 mm, and the Q values ​​when the thickness of the second planar coil 12 is 0.5 mm, 0.30 mm, 0.25 mm, and 0.15 mm are simulated. The simulation results of mode (2) are shown in Table 6 below. Moreover, the simulation results of mode (1) are shown in Table 7. Figure 7 As shown in Figure 2, the simulation results of mode (2) are as follows: Figure 8 shown.

[0266] [Table 5]

[0267]

[0268] [Table 6]

[0269]

[0270] It can also be confirmed and estimated from the above simulation results that the performance of the coil component 10 can be significantly improved by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm. Figure 7 as well as Figure 8 As shown, it is estimated that the maximum value of the Q value occurs when the thickness of the second planar coil 12 is greater than or equal to 0.2 mm and less than or equal to 0.3 mm.

[0271] <Application of coil components>

[0272] The coil component 10 of the present embodiment can be used as a power transmission coil in the power transmission device 1 of the wireless power transmission system S described above, and can be used as a power reception coil in the power reception device 2 .

[0273] When the coil component 10 is used as a power transmission coil, the first connection terminal 51 and the second connection terminal 52 are connected to the Figure 1 The high-frequency current supply unit 1A or the AC power supply shown in . When the high-frequency current is supplied to the coil component 10, after the current is caused to flow from the first connecting terminal 51 to the first planar coil 11 and the second planar coil 12, the current can be caused to flow from the second connecting terminal 52 to the high-frequency current supply unit 1A or the AC power supply. In addition, after the current is caused to flow from the second connecting terminal 52 to the second planar coil 12 and the first planar coil 11, the current can be caused to flow from the first connecting terminal 51 to the high-frequency current supply unit 1A or the AC power supply. Thus, a magnetic field including magnetic lines of force along the central axis of the planar coil 11 can be generated.

[0274] On the other hand, when the coil component 10 is used as a power receiving coil, a high-frequency current can be generated in the first planar coil 11 and the second planar coil 12 by receiving a magnetic field including magnetic lines of force passing through the inside of the first planar coil 11 and the second planar coil 12. Then, the high-frequency current can be supplied to an external device from the first connection terminal 51 or the second connection terminal 52.

[0275] In addition, the coil component 10 can also be used in a transformer, an antenna, etc. For example, when the coil component 10 functions as a primary coil in a transformer, the first connection terminal 51 and the second connection terminal 52 are connected to an AC power source. Then, by being supplied with a high-frequency current, magnetic flux can be supplied from the center side of the planar coil to the iron core.

[0276] The coil component 10 of the present embodiment described above includes: a first planar coil 11; a second planar coil 12, which overlaps with the first planar coil 11; a retaining body 30, which includes a portion covering a surface of the first planar coil 11 opposite to the surface facing the second planar coil 12 and has magnetism; and a magnetic shielding member 20, which is arranged to face the surface of the covered portion of the retaining body 30 opposite to the surface facing the first planar coil 11. In addition, the first planar coil 11 and the second planar coil are connected in series, and the thickness of the second planar coil 12 is greater than 0.15 mm and less than 0.35 mm.

[0277] According to the coil component 10 of this embodiment, it is possible to improve performance while suppressing enlargement and weight increase. It is generally believed that the greater the thickness of the coil, the higher the inductance can be obtained in the coil, and it is presumed that the coil performance such as the Q value tends to become better. However, the inventors of the present application have found through in-depth research that in a structure in which a planar coil is superimposed on a magnetic component in a state of being connected in series, such a trend does not necessarily occur. In addition, the inventors of the present application have found that when an alternating current or an alternating magnetic field in a predetermined frequency band is supplied in a structure in which the first planar coil 11 and the second planar coil 12 are superimposed on the magnetic shielding component 20 and the retaining body 30 in this order, regardless of the thickness of the first planar coil 11, when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm, a maximum value of the Q value is generated. According to this finding, it is determined that the use of a second planar coil 12 with a thickness of 0.25 mm can further improve the performance of the coil component 10 compared with the case of using a second planar coil 12 with a thickness of 0.5 mm, for example.

[0278] That is, in the coil component 10 based on such a discovery, by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the second planar coil 12 can be made thinner. Moreover, when used in a predetermined frequency band, the performance of the coil component 10 can be improved as much as possible. Thus, the performance of the coil component 10 can be improved while suppressing the increase in the overall size and weight of the coil component 10. The following phenomenon is a phenomenon that is difficult to predict from technical common sense: when an alternating current or an alternating magnetic field in a predetermined frequency band is supplied in a structure in which the first planar coil 11 and the second planar coil 12 are overlapped in this order on the magnetic shielding member 20 and the retaining body 30, regardless of the thickness of the first planar coil 11, a maximum value of the Q value is generated when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm. It is believed that the above-mentioned coil component created based on such a phenomenon has a significant effect that greatly contributes to improving the performance of the coil component.

[0279] In detail, the inventors of the present application have found that, when an alternating current of 75 kHz to 100 kHz, particularly 79 kHz to 90 kHz, is supplied to the first planar coil 11 and the second planar coil 12, or an alternating magnetic field of 75 kHz to 100 kHz, particularly 79 kHz to 90 kHz, is supplied, a maximum value of the Q value is generated when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm, regardless of the thickness of the first planar coil 11. That is, in a structure in which the thickness of the second planar coil 12 is set to 0.15 mm to 0.35 mm, when an alternating current of 75 kHz to 100 kHz, particularly 79 kHz to 90 kHz, is supplied, or an alternating magnetic field of 75 kHz to 100 kHz, particularly 79 kHz to 90 kHz, is supplied as an alternating current or an alternating magnetic field in a predetermined frequency band, the performance is significantly improved.

[0280] In addition, when the thickness of the second planar coil 12 is set to be greater than 0.15 mm and less than 0.35 mm as described above, the thickness of the first planar coil 11 is preferably greater than or equal to 0.1 mm and less than 1.0 mm. In this structure, the coil component 10 can be formed to be extremely thin and lightweight while satisfying the performance required in, for example, relatively high-power contactless power transmission. Therefore, a coil component 10 with excellent practicality can be provided.

[0281] In addition, the gap between the first planar coil 11 and the second planar coil 12 may be 0.5 mm or more and 1.5 mm or less. According to this structure, the performance of the coil component 10 can be effectively improved without hindering the reduction in thickness.

[0282] In this embodiment, the holder 30 includes a resin and magnetic particles held by the resin. In this case, the bonding strength between the resin and the first and second planar coils 11 and 12 can be increased, so that the first and second planar coils 11 and 12 can be integrated in a stable state.

[0283] In addition, the relative magnetic permeability of the retaining body 30 may be 5.0 or more. In this case, the performance of the coil component can be improved by the magnetic permeability of the retaining body 30. In addition, the relative magnetic permeability of the retaining body 30 may be 10.0 or less. In this case, the strength of the retaining body 30 can be appropriately ensured, and the coupling state between the retaining body 30 and each planar coil 11, 12 can be strengthened.

[0284] In addition, the holding body 30 in the present embodiment includes the wall portion 34 protruding from the second planar coil 12. In this structure, the transmission efficiency of the magnetic flux transmitted from the coil component 10 or received from other coil components can be effectively improved.

[0285] In addition, in the present embodiment, any one of the multiple turns 11n of the first planar coil 11 and any one of the multiple turns 12n of the second planar coil 12 partially overlap in the axial direction of the first planar coil 11. Moreover, a portion of the turns 11n of the first planar coil 11 and a portion of the turns 12n of the second planar coil 12 that overlap in the axial direction of the first planar coil 11 extend parallel to each other. With this structure, the performance of the coil component 10 can be effectively improved. It is presumed that the improvement in coil performance according to the present structure is produced by suppressing eddy current loss that may be generated between the first planar coil 11 and the second planar coil 12.

[0286] The inventors of the present application have found that, for example, the phenomenon that the maximum point of the Q value occurs when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm is related to the skin thickness of the coil, and the dimensional condition for the maximum value of the Q value varies depending on the skin thickness of the coil. The skin thickness δ is calculated by the following formula.

[0287] δ=1 / √π·f·μr·μ0·σ

[0288] f: frequency, μr: coil permeability, μ0: free space permeability, σ: coil conductivity

[0289] The skin thickness δ varies according to the frequency of the AC current. When the frequency of the AC current is 75 KHz or more and 100 KHz or less, the skin thickness δ is about 0.19 to 0.21 mm. The inventors of the present application estimate that when the skin thickness δ is 0.19 to 0.21 mm, the Q value is significantly improved when the thickness of the second planar coil 12 is consistent with or close to this value.

[0290] Below, refer to Fig. 9 , a coil component 10 ′ according to another embodiment will be described. Fig. 9 2 is a cross-sectional view of the coil component 10 ′. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0291] (Other Embodiments 1)

[0292] The coil component 10' further includes an even number of other planar coils 201 and 202 disposed between the first planar coil 11 and the second planar coil 12. In this embodiment, the even number of other planar coils 201 and 202 are composed of the third planar coil 201 and the fourth planar coil 202. However, the even number of other planar coils may also be composed of four, six, etc. planar coils.

[0293] Furthermore, the first planar coil 11, the other planar coils 201, 202, and the second planar coil 12 are connected in series. Furthermore, the thickness of at least the fourth planar coil 202 among the other planar coils 201, 202, the third planar coil 201 connected to the first planar coil 11, and the fourth planar coil 202 different therefrom, is 0.15 mm or more and 0.35 mm or less. In this embodiment, the thickness of the third planar coil 201 is also 0.15 mm or more and 0.35 mm or less. Furthermore, the thickness of the second planar coil 12, the thickness of the third planar coil 201, and the thickness of the fourth planar coil 202 are the same. It should be noted that the size of the first planar coil 11 is within the same range as the above-mentioned embodiment, for example, the thickness can be 0.2 mm or more and 1.0 mm or less. In addition, when the thickness of the third planar coil 201 is set to a value deviating from 0.15 mm or more and 0.35 mm or less, the thickness of the third planar coil 201 can be 1.0 mm or less, or can be the same as the thickness of the first planar coil 11.

[0294] The coil component 10' according to the present embodiment can also improve performance while suppressing enlargement and weight increase. More specifically, when an alternating current of 75KHz to 100KHz, especially 79KHz to 90KHz, is supplied to the first planar coil 11, other planar coils 201, 202 and the second planar coil 12, or an alternating magnetic field of 75KHz to 100KHz, especially 79KHz to 90KHz, is supplied, the performance of the coil component 10' can be significantly improved.

[0295] In the coil component 10', when the thickness of the first planar coil 11 is set to 0.5 mm, the thickness of the third planar coil 201 is set to 0.25 mm, the thickness of the fourth planar coil 202 is set to 0.25 mm, and the thickness of the second planar coil 12 is set to 0.25 mm, and the Q value is simulated under the same conditions as the simulation conditions shown in Table 1, the Q value is 227.

[0296] In addition, when the thickness of the first planar coil 11 is set to 0.5 mm, the thickness of the third planar coil 201 is set to 0.50 mm, the thickness of the fourth planar coil 202 is set to 0.25 mm, and the thickness of the second planar coil 12 is set to 0.25 mm, and the Q value is simulated, the Q value is 202.

[0297] In contrast, when the thickness of all four planar coils was set to 0.5 mm and the Q value was simulated, the Q value was 101.

[0298] In the above simulation results, it can be confirmed that when an even number of planar coils are overlapped and the current passed through is 75KHz or more and 100KHz or less, especially 79KHz or more and 90KHz or less, the coil performance can be improved by setting the thickness of the planar coils other than the first planar coil 11 closest to the magnetic material (20, 30) to 0.25mm. Although the simulation results are omitted, the inventors of the present application have confirmed that in the structure of the present embodiment, even if the thickness of the planar coils other than the first planar coil 11 is a value different from 0.25mm within the range of 0.15mm or more and 0.35mm or less, the coil performance can be improved.

[0299] In the following, a plurality of other embodiments will be described. In each of the embodiments described below, components identical to those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0300] (Other Implementation 2)

[0301] Fig.10 The coil component 10A of the other embodiment 2 shown in the figure has Figures 2 to 5 In addition to the first planar coil 11, the second planar coil 12, the magnetic shield 20 and the holder 30 shown, a second magnetic shield 60 is also provided. Hereinafter, for convenience of description, the magnetic shield 20 may be referred to as a first magnetic shield 20.

[0302] The second magnetic shielding member 60 is arranged to face the surface of the first magnetic shielding member 20 opposite to the first layer 31 (the portion covering the surface 111B of the first planar coil 11) facing the retaining body 30 (magnetic member). The second magnetic shielding member 60 is plate-shaped, but its shape is not particularly limited. The second magnetic shielding member 60 faces the first magnetic shielding member 20 with a gap in the direction in which the first planar coil 11 and the second planar coil 12 overlap. The material of the first magnetic shielding member 20 and the material of the second magnetic shielding member 60 are different from each other.

[0303] In this example, the relationship between the first magnetic shielding member 20 and the second magnetic shielding member 60 is as follows. The volume resistivity of the first magnetic shielding member 20 is greater than the volume resistivity of the second magnetic shielding member 60. The volume resistivity of the first magnetic shielding member 20 may be 10 times that of the second magnetic shielding member 60. 2 times or more, or 10 3 times or more, or 10 4 times or more, or 10 5 times or more, or 10 6 The relative magnetic permeability of the first magnetic shielding member 20 is greater than the relative magnetic permeability of the second magnetic shielding member 60. The relative magnetic permeability of the first magnetic shielding member 20 may be greater than 100 times, greater than 200 times, greater than 500 times, greater than 1000 times, or greater than 2000 times the relative magnetic permeability of the second magnetic shielding member 60.

[0304] The second magnetic shielding member 60 faces the first magnetic shielding member 20 with a gap therebetween, but may be in direct contact with the first magnetic shielding member 20, or a spacer may be provided between the second magnetic shielding member 60 and the first magnetic shielding member 20. The second magnetic shielding member 60 is formed of a metal material and has conductivity. Specifically, in this example, the second magnetic shielding member 60 includes aluminum, and more specifically, is formed of aluminum. It should be noted that the second magnetic shielding member 60 may be formed of an aluminum alloy, copper, stainless steel, or the like.

[0305] exist Fig.10 In the coil component 10A shown, the thickness of the second planar coil 12 is also greater than 0.15 mm and less than 0.35 mm. Thus, when supplied with an alternating current of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz, or when supplied with an alternating magnetic field of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz, the coil component 10A is constructed to significantly improve its performance. That is, when the coil component 10A is used specifically, it is also constructed to be applied to, for example Figure 1The power transmission system S shown is supplied with an AC current of 75KHz to 100KHz or 79KHz to 90KHz, or an AC magnetic field of 75KHz to 100KHz or 79KHz to 90KHz, similarly to the coil component 10. Thus, the coil component 10A performs a useful function.

[0306] The thickness of the first planar coil 11 (thickness of the conductor 11E) can be, for example, 0.1 mm or more and 1.0 mm or less. The first planar coil 11, the second planar coil 12, the retainer 30, and the magnetic shielding member 20 can be used together with the Figures 2 to 5 The elements of the coil component 10 described above are formed under the same shape and size conditions. For example, the holding body 30 may not have the wall portion 34 .

[0307] Next, with reference to the following Table 7, the simulation results obtained by evaluating the performance of the coil component 10A are described. In Table 7, the evaluation results of the coil component 10A and its comparative examples 1-A and 1-B are shown. In the simulated coil component 10A, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.25 mm. Comparative example 1-A is a coil component as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are configured to be the same as the coil component 10A. Comparative example 1-B is a coil component as follows: the thickness of the first planar coil 11 is set to 0.25 mm, the thickness of the second planar coil 12 is set to 0.5 mm, and the other structures are configured to be the same as the coil component 10A. It should be noted that in the coil component 10A, comparative example 1-A and comparative example 1-B, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples illustrated here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) depending on the conditions of the frequency used.

[0308] [Table 7]

[0309]

[0310] "The present disclosure" in the left column of Table 7 shows the coil component 10A, and in the column on the right, the coil thickness conditions (050 / 025, i.e., 0.5mm / 0.25mm) in the simulation of the coil component 10A, the Q value calculated by simulation, the loss, and the resistance are sequentially shown. In the columns on the right of "Comparative Example 1-A" and "Comparative Example 1-B" in the left column of Table 7, similarly, the coil thickness conditions in the simulation related to the comparative example, the Q value calculated by simulation, the loss, and the resistance are sequentially shown. It should be noted that the loss of the magnetic shield in the table refers to the loss in the second magnetic shield component 60.

[0311] As is apparent from Table 7, the Q value of the coil component 10A is 183, which is higher than the Q value (130) of Comparative Example 1-A and the Q value (120) of Comparative Example 1-B. In addition, the loss in the coil component 10A (loss in the magnetic shielding component 60 and loss in the coils 11 and 12) is lower than the loss in Comparative Example 1-A and the loss in Comparative Example 1-B. In addition, the simulation was performed with the frequency of the AC current supplied to the coil component set to 85KHz, but regarding the AC resistance, the coil component 10A is also lower than Comparative Example 1-A and Comparative Example 1-B.

[0312] According to the simulation results shown in Table 7, the performance level of coil component 10A can be confirmed. In particular, coil component 10A ensures higher performance than comparative example 1-A while suppressing the material usage of the coil more than comparative example 1-A. This point confirms the usefulness of the present disclosure. In addition, coil component 10A and comparative example 1-B use two coils under the same conditions, but there are significant differences in performance. The effort put into the position of the coil with a thickness of more than 0.15 mm and less than 0.35 mm is also one of the characteristics of the present disclosure.

[0313] (Other Implementation 3)

[0314] In the above embodiment, the first layer 31 of the holder 30 (the portion covering the surface 111B of the first planar coil 11) entirely covers the surface 111B of the first planar coil 11. Fig.11 as well as Fig.12 In the coil component 10B of another embodiment 3 shown in FIG. 1 , the first layer 31 of the retaining body 30 partially covers the surface 111B, which is the surface of the first planar coil 11 opposite to the surface facing the second planar coil 12. It should be noted that in the embodiment 3 described herein, the first layer 31 and the surface 111B of the retaining body 30 partially cover the surface 111B, which is the surface of the first planar coil 11 opposite to the surface facing the second planar coil 12. Figure 2 to Figure 5 The structure described in is different from that of and is composed only of the portion facing the surface 111B.

[0315] In this example, if Fig.11As shown by the dotted line, each turn 11n of the first planar coil 11 includes a first straight line portion 11ns1 extending along a straight line, a first corner portion 11nc1 connected to the first straight line portion 11ns1 and extending in a curved shape, a second straight line portion 11ns2 connected to the first corner portion 11nc1 and extending along a straight line, a second corner portion 11nc2 connected to the second straight line portion 11ns2 and extending in a curved shape, a third straight line portion 11ns3 connected to the second corner portion 11nc2 and extending along a straight line, a third corner portion 11nc3 connected to the third straight line portion 11ns3 and extending in a curved shape, and other portions, and forms a surrounding shape. Although detailed description is omitted, similarly, each turn 12n of the second planar coil 12 also includes a first straight line portion 12ns1, a first corner portion 12nc1, a second straight line portion 12ns2, a second corner portion 12nc2, a third straight line portion 12ns3, a third corner portion 12nc3, and other portions, and forms a surrounding shape.

[0316] In detail, the first layer 31 of the retaining body 30 covers the first straight line portion 11ns1, the second straight line portion 11ns2, and the third straight line portion 11ns3. On the other hand, the first layer 31 of the retaining body 30 does not cover the first corner portion 11nc1, the second corner portion 11nc2, and the third corner portion 11nc3. In other words, the retaining body 30 does not overlap the first corner portion 11nc1, the second corner portion 11nc2, and the third corner portion 11nc3 in the direction in which the first planar coil 11 overlaps with the second planar coil 12.

[0317] In addition, the retaining body 30 in this example includes a plurality of, in this example, three, mutually separated components 301 to 303. Specifically, the retaining body 30 includes a first component 301, a second component 302, and a third component 303. Each of the components 301 to 303 includes a first layer 31, and the first layer 31 covers the first planar coil 11. In detail, the first layer 31 of the first component 301 covers the first straight line portion 11ns1. The first layer 31 of the second component 302 covers the second straight line portion 11ns2. The first layer 31 of the third component 303 covers the third straight line portion 11ns3.

[0318] Furthermore, each of the components 301 to 303 includes a first layer 31 and a plurality of guide and holding plate portions 35 rising from the first layer 31. The guide and holding plate portions 35 are made of the same material as the first layer 31 and have magnetism. The plurality of guide and holding plate portions 35 extend in a straight line parallel to each other. Furthermore, in each of the components 301 to 303, a space for accommodating the straight line portion (11ns1, 11ns2, 11ns3, 12ns1, 12ns2, 12ns3) is formed between adjacent guide and holding plate portions 35. Furthermore, the holding body 30 holds the first planar coil 11 and the second planar coil 12 in a state where the straight line portion (11ns1, 11ns2, 11ns3) of the first planar coil 11 and the straight line portion (12ns1, 12ns2, 12ns3) of the second planar coil 12 overlap in this order between adjacent guide and holding plate portions 35. Here, in this example, an air layer is formed between the straight portion (11ns1, 11ns2, 11ns3) of the first planar coil 11 and the straight portion (12ns1, 12ns2, 12ns3) of the second planar coil 12 disposed between adjacent guide retaining plate portions 35. However, between the straight portion (11ns1, 11ns2, 11ns3) of the first planar coil 11 and the straight portion (12ns1, 12ns2, 12ns3) of the second planar coil 12, for example, an insulating resin may be filled, or a spacer made of the same material as the retaining body 30 may be filled. On the other hand, as Fig.12 As shown, the portion of the first planar coil 11 that does not overlap with the holding body 30 overlaps with the magnetic shield member 20 with a gap (air layer) provided between the portion and the magnetic shield member 20 .

[0319] In addition, Fig.11 In the coil component 10B shown, the thickness of the second planar coil 12 is also greater than 0.15 mm and less than 0.35 mm. Therefore, when an alternating current of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, or an alternating magnetic field of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, the coil component 10B is constructed to significantly improve its performance. That is, when the coil component 10B is used specifically, it is also constructed to be applied to, for example Figure 1 The power transmission system S shown is supplied with an AC current of 75KHz to 100KHz or 79KHz to 90KHz, or an AC magnetic field of 75KHz to 100KHz or 79KHz to 90KHz, similarly to the coil component 10. Thus, the coil component 10B performs a useful function.

[0320] On the other hand, the thickness of the first planar coil 11 (thickness of the conductor 11E) can be, for example, 0.1 mm or more and 1.0 mm or less. The first planar coil 11, the second planar coil 12, the retaining body 30, and the magnetic shielding member 20 can be used together with the Figures 2 to 5 The coil components 10 are formed under the same shape and size conditions as described above. It should be noted that the coil components 10 and 10B have different shapes in the details of the first planar coil 11 and the second planar coil 12, but they are not essentially different. Specifically, in this example, the direction in which the first planar coil 11 is wound and the direction in which the second planar coil 12 is wound are the same as those used. Figures 2 to 5 The situation of the coil component 10 described in the above description is opposite. In addition, the number of turns of the first planar coil 11 and the number of turns of the second planar coil 12 are different from those of the coil component 10 described in the above description. Figures 2 to 5 The same is true for the case of the coil component 10 described above. Such detailed structures are not particularly limited.

[0321] Next, with reference to the following Table 8, the simulation results obtained by evaluating the performance of the coil component 10B are described. In Table 8, the evaluation results of the coil component 10B and its comparative examples 2-A and 2-B are shown. In the simulated coil component 10B, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.25 mm. Comparative example 2-A is a coil component as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are configured to be the same as the coil component 10B. Comparative example 2-B is a coil component as follows: the thickness of the first planar coil 11 is set to 0.25 mm, the thickness of the second planar coil 12 is set to 0.5 mm, and the other structures are configured to be the same as the coil component 10B. It should be noted that in the coil component 10B, comparative example 2-A and comparative example 2-B, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples illustrated here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) depending on the conditions of the frequency used.

[0322] [Table 8]

[0323]

[0324] The "Present Disclosure" in the left column of Table 8 shows the coil component 10B, and the columns on the right side thereof sequentially show the coil thickness conditions in the simulation of the coil component 10B, the Q value calculated by simulation, the loss, and the resistance. Similarly, in the columns on the right side of "Comparative Example 2-A" and "Comparative Example 2-B" in the left column of Table 8, the coil thickness conditions in the simulation related to the comparative example, the Q value calculated by simulation, the loss, and the resistance are sequentially shown.

[0325] As is apparent from Table 8, the Q value of the coil component 10B is 95, which is higher than the Q value (84) of Comparative Example 2-A and the Q value (78) of Comparative Example 2-B. In addition, the loss in the coil component 10B (loss in the magnetic shielding component 60 and loss in the coils 11 and 12) is lower than the loss in Comparative Example 2-A and the loss in Comparative Example 2-B. In addition, the simulation was performed with the frequency of the AC current supplied to the coil component set to 85 kHz, but regarding the AC resistance, the coil component 10A is also lower than Comparative Example 2-A and Comparative Example 2-B.

[0326] The performance level of coil component 10B can be confirmed from the simulation results shown in Table 8. In particular, coil component 10B can achieve higher performance than Comparative Example 2-A while further reducing the amount of coil material used. This proves the usefulness of the present disclosure.

[0327] (Other Implementation 4)

[0328] Fig.13 The coil component 10C of another embodiment 4 shown in the figure includes a first planar coil 11, a second planar coil 12, and a retaining body 30, and does not include a magnetic shielding member 20. This structure is useful when applied to a power transmission device. The first planar coil 11, the second planar coil 12, and the retaining body 30 have the same structure as the magnetic shielding member 20. Figures 2 to 5 The structure is the same as the structure described above.

[0329] exist Fig.13 In the coil component 10C shown, the thickness of the second planar coil 12 is also greater than 0.15 mm and less than 0.35 mm. Therefore, when an alternating current of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, or an alternating magnetic field of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, the coil component 10C is configured to significantly improve its performance. That is, when the coil component 10C is used specifically, it is also configured to be applied to, for example Figure 1 The power transmission system S shown is supplied with an AC current of 75KHz to 100KHz or 79KHz to 90KHz, or an AC magnetic field of 75KHz to 100KHz or 79KHz to 90KHz, similarly to the coil component 10. Thus, the coil component 10C performs useful functions.

[0330] The thickness of the first planar coil 11 (the thickness of the conductor 11E) can be, for example, 0.1 mm or more and 1.0 mm or less. The first planar coil 11, the second planar coil 12, and the holder 30 can be used together with the Figures 2 to 5 The coil components 10 described above are formed under the same shape and size conditions. It should be noted that the coil components 10 and 10C may have different shapes in the details of the first planar coil 11 and the second planar coil 12.

[0331] Next, with reference to the following Table 9, the simulation results obtained by evaluating the performance of the coil component 10C are described. In Table 9, the evaluation results of the coil component 10C and its comparative examples 3-A and 3-B are shown. In the simulated coil component 10C, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.25 mm. Comparative example 3-A is a coil component as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are configured to be the same as the coil component 10C. Comparative example 3-B is a coil component as follows: the thickness of the first planar coil 11 is set to 0.25 mm, the thickness of the second planar coil 12 is set to 0.5 mm, and the other structures are configured to be the same as the coil component 10C. It should be noted that in the coil component 10C, comparative example 3-A and comparative example 3-B, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples illustrated here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) depending on the conditions of the frequency used.

[0332] [Table 9]

[0333]

[0334] The "Present Disclosure" in the left column of Table 9 shows the coil component 10C, and the columns on the right side thereof sequentially show the coil thickness conditions in the simulation of the coil component 10C, the Q value calculated by simulation, the loss, and the resistance. Similarly, the columns on the right side of "Comparative Example 3-A" and "Comparative Example 3-B" in the left column of Table 9 sequentially show the coil thickness conditions in the simulation related to the comparative examples, the Q value calculated by simulation, the loss, and the resistance.

[0335] As is apparent from Table 9, the Q value of the coil component 10C is 195, which is higher than the Q value (190) of Comparative Example 3-A and the Q value (167) of Comparative Example 3-B. In addition, the loss in the coil component 10C (loss in the coils 11 and 12) is lower than the loss in Comparative Example 3-A and the loss in Comparative Example 3-B. In addition, the simulation was performed with the frequency of the AC current supplied to the coil component set to 85 kHz, but regarding the AC resistance, the coil component 10C is also lower than Comparative Example 3-A and Comparative Example 3-B.

[0336] The performance level of the coil component 10C can be confirmed from the simulation results shown in Table 9. In particular, the coil component 10C has a higher performance than the comparative example 3-A while further reducing the amount of coil material used. This proves the usefulness of the present disclosure.

[0337] (Other Implementation 5)

[0338] Figures 14 to 16 The coil component 10D shown in the figure includes a first planar coil 11, a second planar coil 12, a retaining body 30, and a magnetic block material 70. This structure is useful when applied to a power transmission device. The first planar coil 11, the second planar coil 12, and the retaining body 30 have the same structure as the magnetic block material 70. Figures 2 to 5 The structure is the same as the structure described above.

[0339] The coil component 10D includes a plurality of, in this example, four, magnetic block materials 70. The magnetic block material 70 is located at a position covering a surface 111B, which is a surface of the first layer 31 of the retaining body 30 opposite to the surface facing the first planar coil 11. However, the magnetic block material 70 is in the shape of an elongated plate and covers only a portion of the first planar coil 11.

[0340] The magnetic block materials 70 are each configured to start from a position radially outside the center of the first planar coil 11 and the second planar coil 12, and the length direction thereof extends in the radial direction of the first planar coil 11 and the second planar coil 12. The four magnetic block materials 70 are arranged at intervals of 90 degrees in the circumferential direction, and are arranged to form a cross shape when viewed in the direction in which the first planar coil 11 and the second planar coil 12 overlap. In addition, three of the four magnetic block materials 70 are respectively configured to be orthogonal to any one of the straight line portions (11ns1, 11ns2, 11ns3) of the first planar coil 11 and any one of the straight line portions (12ns1, 12ns2, 12ns3) of the second planar coil 12 at the midpoint of each portion when viewed in the direction in which the first planar coil 11 and the second planar coil 12 overlap.

[0341] It should be noted that the number and position of the magnetic block materials 70 are not particularly limited.

[0342] exist Figures 14 to 16In the coil component 10D shown, the thickness of the second planar coil 12 is also greater than 0.15 mm and less than 0.35 mm. Therefore, when an alternating current of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, or an alternating magnetic field of greater than 75 KHz and less than 100 KHz, or greater than 79 KHz and less than 90 KHz, or 85 KHz is supplied, the coil component 10D is constructed to significantly improve its performance. That is, when the coil component 10D is used specifically, it is also constructed to be applied to, for example Figure 1 The power transmission system S shown is supplied with an AC current of 75KHz to 100KHz or 79KHz to 90KHz, or an AC magnetic field of 75KHz to 100KHz or 79KHz to 90KHz, similarly to the coil component 10. Thus, the coil component 10D performs a useful function.

[0343] The thickness of the first planar coil 11 (the thickness of the conductor 11E) can be, for example, 0.1 mm or more and 1.0 mm or less. The first planar coil 11, the second planar coil 12, and the holder 30 can be used together with the Figures 2 to 5 The coil components 10 are formed under the same shape and size conditions as the elements of the coil components 10 described above. It should be noted that the coil components 10 and the coil components 10D have different shapes in the details of the first planar coil 11 and the second planar coil 12, but they are not essentially different. Specifically, in this example, the direction in which the first planar coil 11 is wound and the direction in which the second planar coil 12 is wound are the same as those used. Figures 2 to 5 The situation of the coil component 10 described in the above description is opposite. In addition, the number of turns of the first planar coil 11 and the number of turns of the second planar coil 12 are different from those of the coil component 10 described in the above description. Figures 2 to 5 The same is true for the case of the coil component 10 described above. Such detailed structures are not particularly limited.

[0344] Next, with reference to the following Table 10, the simulation results obtained by evaluating the performance of the coil component 10D are described. In Table 10, the evaluation results of the coil component 10D and its comparative examples 4-A and 4-B are shown. In the simulated coil component 10D, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.25 mm. Comparative example 4-A is a coil component as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are configured to be the same as the coil component 10D. Comparative example 4-B is a coil component as follows: the thickness of the first planar coil 11 is set to 0.25 mm, the thickness of the second planar coil 12 is set to 0.5 mm, and the other structures are configured to be the same as the coil component 10D. It should be noted that in the coil component 10D, comparative example 4-A and comparative example 4-B, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples illustrated here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) depending on the conditions of the frequency used.

[0345] [Table 10]

[0346]

[0347] The "Present Disclosure" in the left column of Table 10 shows the coil component 10D, and the columns on the right side thereof sequentially show the coil thickness conditions in the simulation of the coil component 10D, the Q value calculated by simulation, the loss, and the resistance. Similarly, the columns on the right side of "Comparative Example 4-A" and "Comparative Example 4-B" in the left column of Table 10 sequentially show the coil thickness conditions in the simulation related to the comparative examples, the Q value calculated by simulation, the loss, and the resistance.

[0348] As is apparent from Table 10, the Q value of the coil component 10D is 235, which is higher than the Q value (156) of Comparative Example 4-A and the Q value (142) of Comparative Example 4-B. In addition, the loss in the coil component 10D (loss in the coils 11 and 12) is lower than the loss in Comparative Example 4-A and the loss in Comparative Example 4-B. In addition, the simulation was performed with the frequency of the AC current supplied to the coil component set to 85KHz, but the AC resistance of the coil component 10D was also lower than that of Comparative Example 4-A and Comparative Example 4-B.

[0349] The performance level of the coil component 10D can be confirmed from the simulation results shown in Table 10. In particular, the coil component 10D has a higher performance than the comparative example 4-A while further reducing the amount of coil material used. This proves the usefulness of the present disclosure.

[0350] Below, for Figures 2 to 5The simulation results related to the performance of the embodiment in which the first planar coil 11 is formed of aluminum and the second planar coil 12 is formed of copper in the coil component 10 shown will be described. The simulation was performed using Femtet (registered trademark) manufactured by Murata Software Co., Ltd.

[0351] In the simulation described below, in the coil component 10 in the above-mentioned embodiment, a plurality of values ​​are set for the thickness of the first planar coil 11 and the thickness of the second planar coil 12, and the Q values ​​corresponding to each are calculated. In addition, as a comparative example, a condition where "the first planar coil 11 is formed of aluminum and the second planar coil 12 is formed of copper" or "the size condition" is deviated from the use Figures 2 to 5 Simulation of Q values ​​of multiple coil components in the described embodiment. It should be noted that the comparative examples illustrated here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) depending on the conditions of the frequency used.

[0352] The detailed conditions in the simulation are as follows.

[0353] The high-frequency current supplied is 40A and the frequency is 85KHz.

[0354] The conductivity of the first planar coil 11 formed of aluminum is 3.77×10 7 [S / m] The electrical conductivity of the second planar coil 12 formed of copper is 5.98×10 7 [S / m].

[0355] The relative magnetic permeability of the magnetic shield member 20 is 3000, and the relative magnetic permeability of the holding body 30 is 5.0.

[0356] · Figure 2 The width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the IV-IV line direction is 200 mm, and the width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction orthogonal to the IV-IV line is 200 mm.

[0357] The simulation results related to the above-mentioned embodiment are shown in the following Table 11. Under the "embodiment" recorded at the top of Table 11, multiple dimensional conditions of the coil component 10 of the embodiment, weight per square meter W (Kg / m 2 ), Q value and Z (impedance (Ω) as simulation results. On the other hand, the simulation results related to the comparative example are shown in the following Table 12. Under the "Comparative Example" recorded at the top of Table 12, multiple dimensional conditions of the coil component of the comparative example, weight per square meter W (Kg / m 2), Q value and Z (impedance (Ω) as simulation results. The basic structure of the coil component of the comparative example is the same as the coil component 10, except that the size conditions and the coil material conditions deviate from the conditions of the embodiment. In addition, the above-mentioned "weight per square meter W (Kg / m 2 )” refers to the sum of the weight per square meter of the first planar coil 11 and the weight per square meter W of the second planar coil 12. In each of the first planar coil 11 and the second planar coil 12, the weight per square meter of each coil is calculated by multiplying the specific gravity (weight per cubic meter) of the material by the thickness. For example, in the case of a specific gravity of 8960 Kg / m 3 When the thickness of the copper coil is 0.25 mm, the weight per square meter is W (Kg / m 2 ) is 2.24Kg / m 2 The specific gravity is determined once the material is identified, but can also be calculated by dividing the weight at that time by the volume of a part of the coil fragment.

[0358] [Table 11]

[0359]

[0360] [Table 12]

[0361]

[0362] As described above, the inventors of the present application have found that, when the first planar coil 11 and the second planar coil 12 overlap on the magnetic shielding component 20 and the retaining body 30, by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved. In detail, it was found that when used in a specified frequency band, when the thickness of the second planar coil overlapping the first planar coil 11 is set to any one between greater than 0.15 mm and less than 0.35 mm, the Q value of the coil component 10 becomes extremely high. The above-mentioned predetermined frequency band is specifically a frequency band of greater than 75 KHz and less than 100 KHz. When it is greater than 79 KHz and less than 90 KHz, the performance of the coil component 10 is reliably improved.

[0363] As shown in Table 11, in the simulations related to the embodiment, in Simulation 1, the thickness of the first planar coil 11 formed of aluminum is 0.5 mm, and the thickness of the second planar coil 12 formed of copper is 0.25 mm. In Simulation 2, the thickness of the first planar coil 11 formed of aluminum is 0.5 mm, and the thickness of the second planar coil 12 formed of copper is 0.35 mm. In Simulation 3, the thickness of the first planar coil 11 formed of aluminum is 0.5 mm, and the thickness of the second planar coil 12 formed of aluminum is 0.25 mm. In Simulation 4, the thickness of the first planar coil 11 formed of aluminum is 0.5 mm, and the thickness of the second planar coil 12 formed of aluminum is 0.35 mm. In Simulation 5, the thickness of the first planar coil 11 formed of aluminum is 1.0 mm, and the thickness of the second planar coil 12 formed of aluminum is 0.25 mm. In Simulation 6, the thickness of the first planar coil 11 formed of aluminum is 0.25 mm, and the thickness of the second planar coil 12 formed of aluminum is 0.25 mm. The thickness of the second planar coil 12 in each simulation was set to be between 0.15 mm and 0.35 mm. The Q value in simulation 6 was the smallest, 129.3, and the Q values ​​in simulations 1 to 5 were 140 or more.

[0364] Compared with the simulation of the above-mentioned embodiment, in Comparative Examples 1, 3 to 8, the coil thickness corresponding to the second planar coil deviates from the range of 0.15 mm or more and 0.35 mm or less. Moreover, the maximum Q value in Comparative Examples 1, 3 to 8 is only 124.2 in Comparative Example 7, which is smaller than the Q value calculated in the simulation related to the embodiment, and in particular, it is significantly smaller than Simulations 1 to 5. For example, in Comparative Example 5, the thickness of the aluminum coil corresponding to the first planar coil is 0.5 mm, and the thickness of the copper coil corresponding to the second planar coil is 0.5 mm. In Comparative Example 5, the conditions of the first planar coil are the same as those of Simulation 1 of the embodiment, and the material of the second planar coil is the same, but the Q value thereof is less than that of Simulation 1 by more than 50. In addition, in Comparative Example 4, the thickness of the aluminum coil corresponding to the first planar coil is 0.5 mm, and the thickness of the aluminum coil corresponding to the second planar coil is 0.5 mm. In Comparative Example 4, the conditions of the first planar coil are the same as those of Simulation 3 of the embodiment, and the material of the second planar coil is the same, but the Q value thereof is less than that of Simulation 3 by about 30.

[0365] The above simulation results confirm that by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the performance of the coil component 10 when used in a specified frequency band is significantly improved. It should be noted that in the above simulation, although the condition of setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.25 mm has not been verified, the inventors of the present application have confirmed that relatively high coil performance can be ensured within this range. When the thickness of the second planar coil 12 is set to be less than 0.15 mm or greater than 0.35 mm, the Q value tends to decrease. Therefore, the thickness of the second planar coil 12 can be near the middle of 0.15 to 0.35 mm, the thickness of the second planar coil 12 can be greater than 0.20 mm and less than 0.30 mm, the thickness can also be greater than 0.20 mm and less than 0.275 mm, or greater than 0.225 mm and less than 0.275 mm.

[0366] In addition, the inventors of the present application have found that good coil performance can be obtained when the thickness of the coil closest to the magnetic shielding member 20 is relatively large. From this point of view, the thickness of the first planar coil 11 can be greater than 0.5 mm and less than 1.0 mm. For example, in simulations 1 to 5, the thickness of the first planar coil 11 is within the range of greater than 0.5 mm and less than 1.0 mm. On the other hand, in simulation 6, the thickness of the first planar coil 11 is 0.25 mm, and its Q value is smaller than that of simulations 1 to 5. This result confirms the validity of the condition that the thickness of the first planar coil 11 is greater than 0.5 mm and less than 1.0 mm. In addition, when comparing simulation 3 and simulation 5, the thickness of the first planar coil 11 in simulation 5 is twice the thickness of the first planar coil 11 in simulation 3, but the Q values ​​of the two do not change much. This result can be inferred that the performance is ensured by ensuring the thickness of the first planar coil 11 and becomes saturated starting from a thickness of 1 mm. From this viewpoint, in consideration of thickness reduction and weight reduction, it is effective to set the thickness of the first planar coil 11 to 1.0 mm or less in order to reasonably obtain the coil component 10 .

[0367] In addition, in the present embodiment, the first planar coil 11 includes aluminum. Thus, it is possible to reduce weight. In the coil component 10 for which the simulation shown in Table 11 was performed, the total weight of the first planar coil 11 and the second planar coil 12 was suppressed to be small. Specifically, in simulations 1 to 6, the total weight per square meter of the first planar coil 11 and the weight per square meter of the second planar coil 12 was 5 kg / m 2 In contrast, when the comparative examples 2, 9, and 10 were investigated, which calculated Q values ​​equal to or greater than the Q values ​​in simulations 1 to 6, the total weight per square meter in these comparative examples was large, exceeding 5 kg / m 2 (5.1Kg / m2 、6.7Kg / m 2 , 8.9Kg / m 2 ). Moreover, since the amount of copper used is large, the cost may also become high. Compared with these comparative examples 2, 9, and 10, in the coil component 10 of this embodiment, the coil performance (Q value) is reasonably ensured.

[0368] According to the coil component 10 simulated as above, it is easy to ensure the desired performance while suppressing the enlargement, weight increase and cost. It is generally believed that the greater the thickness of the coil, the higher the inductance can be obtained in the coil, and it is estimated that the performance of the coil such as the Q value tends to become better. However, the inventors of the present application have found through in-depth research that in a structure in which the planar coil is superimposed on a magnetic component in a state of being connected in series, such a trend does not necessarily occur. In addition, the inventors of the present application have found that when an alternating current or an alternating magnetic field in a predetermined frequency band is supplied in a structure in which the first planar coil 11 and the second planar coil 12 are superimposed on the magnetic shielding component 20 and the retaining body 30 in this order, regardless of the thickness of the first planar coil 11, when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm, the phenomenon of extremely high Q value occurs. According to this finding, it is determined that the use of a second planar coil 12 with a thickness of 0.25 mm can further improve the performance of the coil component 10 compared with the case of using a second planar coil 12 with a thickness of 0.5 mm, for example.

[0369] That is, in the coil component 10 based on such a discovery, by setting the thickness of the second planar coil 12 to be greater than 0.15 mm and less than 0.35 mm, the second planar coil 12 can be made thinner. Moreover, when used in a predetermined frequency band, the performance of the coil component 10 can be improved as much as possible. Thus, the performance of the coil component 10 can be improved while suppressing the increase in the overall size and weight of the coil component 10. The following phenomenon is a phenomenon that is difficult to predict from technical common sense: when an alternating current or an alternating magnetic field in a predetermined frequency band is supplied in a structure in which the first planar coil 11 and the second planar coil 12 are overlapped in this order on the magnetic shielding member 20 and the retaining body 30, the Q value becomes extremely high when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm, regardless of the thickness of the first planar coil 11. It is believed that the above-mentioned coil component created based on such a phenomenon has a significant effect of greatly contributing to improving the performance of the coil component. Furthermore, a material containing aluminum is used as the material of the first planar coil 11. Thus, high coil performance can be reasonably ensured while suppressing the increase in weight and the cost more effectively. Therefore, according to the present embodiment, it is easy to ensure desired performance while suppressing an increase in size, weight, and cost.

[0370] In detail, the inventors of the present application have found that, when an alternating current of 75 kHz to 100 kHz, especially 79 kHz to 90 kHz, is supplied to the first planar coil 11 and the second planar coil 12, or an alternating magnetic field of 75 kHz to 100 kHz, especially 79 kHz to 90 kHz, is supplied, the Q value becomes extremely high when the thickness of the second planar coil 12 is between 0.15 mm and 0.35 mm, regardless of the thickness of the first planar coil 11. That is, in a structure in which the thickness of the second planar coil 12 is set to 0.15 mm to 0.35 mm, when an alternating current of 75 kHz to 100 kHz, especially 79 kHz to 90 kHz, or an alternating magnetic field of 75 kHz to 100 kHz, especially 79 kHz to 90 kHz, is supplied as an alternating current or an alternating magnetic field in a predetermined frequency band, the performance is significantly improved.

[0371] <Another Implementation Method>

[0372] The various embodiments of the coil components described above are embodiments that significantly improve performance when supplied with an AC current of 75KHz to 100KHz, 79KHz to 90KHz, or 85KHz, or when supplied with an AC magnetic field of 75KHz to 100KHz, 79KHz to 90KHz, or 85KHz. On the other hand, when the frequency of the supplied AC current or AC magnetic field is in a range different from 75KHz to 100KHz, the embodiment of the coil component that can significantly improve performance is different from the above-mentioned embodiment. Below, embodiments of the present disclosure that can improve performance in other frequency bands different from 75KHz to 100KHz are described.

[0373] (Other Embodiment 6)

[0374] First, as still another embodiment (Embodiment 6), when an AC current of 100 KHz to less than 200 KHz or an AC magnetic field of 100 KHz to less than 200 KHz is supplied to the coil, the coil component may include the following structure.

[0375] “A coil component, comprising: a first planar coil 11;

[0376] A second planar coil 12, which overlaps with the first planar coil 11;

[0377] The holding body 30 is a magnetic member including a portion (in the first planar coil 11) covering a surface opposite to a surface facing the second planar coil 12. Figure 2 to Figure 5 ) and has magnetic properties;

[0378] The first planar coil 11 and the second planar coil 12 are connected in series.

[0379] The thickness of the second planar coil 12 is not less than 0.225 mm and not more than 0.275 mm.

[0380] The first planar coil 11 and the second planar coil 12 are supplied with an alternating current of 100 KHz or more and less than 200 KHz, or with an alternating magnetic field of 100 KHz or more and less than 200 KHz.

[0381] Hereinafter, the above structure is referred to as implementation mode 6-1.

[0382] The coil component of the above-mentioned embodiment 6-1 is Figures 2 to 5 Similarly to the structure described in , a magnetic shield member 20 may be further provided (Embodiment 6-2).

[0383] The coil component of the above-mentioned embodiment 6-1 is Fig.10 Similarly to the structure described in , the first magnetic shield member 20 and the second magnetic shield member 60 may be provided (Embodiment 6-3).

[0384] The coil component of the above-mentioned embodiment 6-1 is Fig.11 as well as Fig.12 Similarly to the structure described in , the holding body 30 may partially cover the first planar coil 11 (Embodiment 6-4). Furthermore, the holding body 30 may include a plurality of members 301 to 303 that are separated from each other.

[0385] The coil component of the above-mentioned embodiment 6-1 is Figures 14 to 16 Similarly to the structure described in , the magnetic block material 70 (embodiment 6-5) can be included.

[0386] Next, referring to the following Table 13, simulation results obtained by evaluating the performance of the coil components of embodiments 6-1 to 6-5 are shown. In Table 13, evaluation results of the coil components of embodiments 6-1 to 6-5 and comparative examples of each embodiment are shown. In the simulated coil components of embodiments 6-1 to 6-5, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.25 mm. Comparative Examples 6-A1 to 5 are coil components as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are configured to be the same as the coil components of embodiments 6-1 to 6-5. It should be noted that in the coil components of embodiments 6-1 to 6-5 and the comparative examples, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples exemplified here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) according to the conditions of the frequency used.

[0387] [Table 13]

[0388]

[0389] "Present Disclosure 6-1 to 6-5" in the left column of Table 13 shows the coil components of embodiments 6-1 to 6-5, and in the columns on the right, the conditions of coil thickness in the simulation of the coil components of each embodiment, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In the columns on the right of each of "Comparative Examples 6-A1 to 5" in the left column of Table 13, similarly, the conditions of coil thickness in the simulation related to the comparative example, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In addition, the simulation was performed by setting the frequency of the alternating current supplied to the coil component to 100KHz, 150KHz, and 200KHz.

[0390] It is obvious from Table 13 that the Q value of the coil components of each embodiment 6-1 to 6-5 is higher than the Q value of the corresponding comparative example. In addition, the loss on the coil components of each embodiment 6-1 to 6-5 is lower than the loss of the comparative example. In addition, regarding the AC resistance, the coil components of each embodiment 6-1 to 6-5 are also lower than the comparative example.

[0391] From the simulation results shown in Table 13, the performance levels of the coil components of Embodiments 6-1 to 6-5 can be confirmed.

[0392] It should be noted that the frequency band of the AC current or AC magnetic field supplied as a use condition of the coil components of embodiments 6-1 to 6-5 is different from that of the coil component 10 of the above-mentioned embodiment, but the range of the thickness of the second planar coil 12 used is repeated. However, in the coil components of embodiments 6-1 to 6-5, the range of the thickness of the second planar coil 12 used is narrower than the range of the thickness of the second planar coil 12 in the coil component 10 of the above-mentioned embodiment. In the coil components of embodiments 6-1 to 6-5, good performance can be obtained particularly when the thickness of the second planar coil 12 is within the range of 0.225 mm or more and 0.275 mm or less, and when it deviates from this range, the performance may be significantly reduced. For this reason, in the coil components of embodiments 6-1 to 6-5, the thickness of the second planar coil 12 is set to be 0.225 mm or more and 0.275 mm or less.

[0393] (Other Embodiments 7)

[0394] Next, as still another embodiment (Embodiment 7), when an AC current of 200 KHz to 1 MHz or an AC magnetic field of 200 KHz to 1 MHz is supplied to the coil, the coil component may have the following structure.

[0395] “A coil component, comprising: a first planar coil 11;

[0396] A second planar coil 12, which overlaps with the first planar coil 11;

[0397] The holding body 30 is a magnetic member including a portion (in the first planar coil 11) covering a surface opposite to a surface facing the second planar coil 12. Figure 2 to Figure 5 ) and has magnetic properties;

[0398] The first planar coil 11 and the second planar coil 12 are connected in series.

[0399] The thickness of the second planar coil 12 is not less than 0.075 mm and not more than 0.175 mm.

[0400] The first planar coil 11 and the second planar coil 12 are supplied with an alternating current of 200 KHz or more and 1 MHz or less, or with an alternating magnetic field of 200 KHz or more and 1 MHz or less.

[0401] Hereinafter, the above structure is referred to as implementation mode 7-1.

[0402] The coil component of the above-mentioned embodiment 7-1 is Figures 2 to 5 Similarly to the structure described in , a magnetic shield member 20 may be further provided (Embodiment 7-2).

[0403] The coil component of the above-mentioned embodiment 7-1 is Fig.10 Similarly to the structure described in , the first magnetic shield member 20 and the second magnetic shield member 60 may be provided (Embodiment 7-3).

[0404] The coil component of the above-mentioned embodiment 7-1 is Fig.11 as well as Fig.12 Similarly to the structure described in , the holding body 30 may partially cover the first planar coil 11 (Embodiment 7-4). Furthermore, the holding body 30 may include a plurality of members 301 to 303 that are separated from each other.

[0405] The coil component of the above-mentioned embodiment 7-1 is Figures 14 to 16 Similarly to the structure described in , a magnetic block material 70 can be provided (embodiment 5-5).

[0406] Next, referring to the following Tables 14 and 15, simulation results obtained by evaluating the performance of the coil components of embodiments 7-1 to 7-5 are shown. In Tables 14 and 15, evaluation results of the coil components of embodiments 7-1 to 7-5 and comparative examples of each embodiment are shown. In the simulated coil components of embodiments 7-1 to 7-5, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.10 mm or 0.15 mm. The simulation results when the thickness of the second planar coil 12 is 0.10 mm are shown in Table 14, and the simulation results when the thickness of the second planar coil 12 is 0.15 mm are shown in Table 15. It should be noted that the comparative examples exemplified here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) according to the conditions of the frequency used.

[0407] On the other hand, comparison examples 7-A1 to 5 of the coil components of embodiments 7-1 to 7-5 in which the thickness of the second planar coil 12 is 0.10 mm are also coil components as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are the same as the coil component 10D of embodiments 7-1 to 7-5.

[0408] In addition, comparison examples 7-A1 to 5 of the coil components of embodiments 7-1 to 7-5 in which the thickness of the second planar coil 12 is 0.15 mm are coil components as follows: the thickness of the first planar coil 11 and the thickness of the second planar coil 12 are set to 0.5 mm, and the other structures are the same as the coil component 10D of embodiments 7-1 to 7-5.

[0409] In addition, in the coil components of Embodiments 7-1 to 7-5 and the comparative example, the first planar coil 11 is made of aluminum and the second planar coil 12 is made of copper.

[0410] [Table 14]

[0411]

[0412] [Table 15]

[0413]

[0414] "Present Disclosure 7-1 to 7-5" in the left column of Tables 14 and 15 show the coil components of embodiments 7-1 to 7-5, and in the columns on the right, the conditions of the coil thickness in the simulation of the coil components of each embodiment, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In the columns on the right of "Comparative Examples 7-A1 to 5" in the left column of Tables 14 and 15, similarly, the conditions of the coil thickness in the simulation related to the comparative examples, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In addition, the simulation was performed by setting the frequency of the alternating current supplied to the coil component to 100KHz, 150KHz, and 200KHz.

[0415] It is obvious from Tables 14 and 15 that the Q value of the coil components of each embodiment 7-1 to 7-5 is mostly higher than the Q value of the corresponding comparative example. In addition, the loss on the coil components of each embodiment 7-1 to 7-5 is mostly lower than the loss of the comparative example. In addition, regarding the AC resistance, the coil components of each embodiment 7-1 to 7-5 are also mostly lower than the comparative example. Regarding comparative examples 7-A1 and 7-A5 in Table 14, although there are some conditions where the Q value is higher than that of the present disclosure, considering the amount of coil material used, the present disclosure is obviously more useful than the comparative example.

[0416] From the simulation results shown in Tables 14 and 15, the performance levels of the coil components of Embodiments 7-1 to 7-5 can be confirmed.

[0417] (Other Implementation 8)

[0418] Next, as another embodiment (Embodiment 8), when an AC current of 1.1 MHz or higher or an AC magnetic field of 1.1 MHz or higher is supplied to the coil, the coil component may have the following structure.

[0419] “A coil component, comprising: a first planar coil 11;

[0420] A second planar coil 12, which overlaps with the first planar coil 11;

[0421] The holding body 30 is a magnetic member including a portion (in the first planar coil 11) covering a surface opposite to a surface facing the second planar coil 12. Figure 2 to Figure 5 ) and has magnetic properties;

[0422] The first planar coil 11 and the second planar coil 12 are connected in series.

[0423] The thickness of the second planar coil 12 is greater than 0.45 mm.

[0424] The first planar coil 11 and the second planar coil 12 are supplied with an alternating current of 1.1 MHz or higher, or an alternating magnetic field of 1.1 MHz or higher.

[0425] Hereinafter, the above structure is referred to as implementation mode 8-1.

[0426] The coil component of the above-mentioned embodiment 8-1 is Figures 2 to 5 Similarly to the structure described in , a magnetic shield member 20 may be further provided (Embodiment 8-2).

[0427] The coil component of the above-mentioned embodiment 8-1 is Fig.10 Similarly to the structure described in , the first magnetic shield member 20 and the second magnetic shield member 60 may be provided (Embodiment 8-3).

[0428] The coil component of the above-mentioned embodiment 8-1 is Fig.11 as well as Fig.12 Similarly to the structure described in , the holding body 30 may partially cover the first planar coil 11 (Embodiment 8-4). Furthermore, the holding body 30 may include a plurality of members 301 to 303 that are separated from each other.

[0429] The coil component of the above-mentioned embodiment 8-1 is Figures 14 to 16 Similarly to the structure described in , a magnetic block material 70 can be provided (embodiment 8-5).

[0430] Next, referring to Table 16 below, simulation results obtained by evaluating the performance of the coil components of embodiments 8-1 to 8-5 are shown. In Table 16, evaluation results of the coil components of embodiments 8-1 to 8-5 and comparative examples of each embodiment are shown. In the simulated coil components of embodiments 8-1 to 8-5, the thickness of the first planar coil 11 is set to 0.5 mm, and the thickness of the second planar coil 12 is set to 0.5 mm. Comparative examples 8-A1 to 5 are coil components as follows: the thickness of the first planar coil 11 is 0.50 mm, the thickness of the second planar coil 12 is set to 0.25 mm, and the other structures are the same as the coil components of embodiments 8-1 to 8-5. It should be noted that in the coil components of embodiments 8-1 to 8-5 and the comparative examples, the first planar coil 11 is aluminum and the second planar coil 12 is copper. It should be noted that the comparative examples exemplified here are not necessarily excluded from the present disclosure (the present invention), and constitute the present disclosure (the present invention) according to the conditions of the frequency used.

[0431] [Table 16]

[0432]

[0433] "Present Disclosure 8-1 to 8-5" in the left column of Table 16 shows the coil components of embodiments 8-1 to 8-5, and in the columns on the right, the conditions of the coil thickness in the simulation of the coil components of each embodiment, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In the columns on the right of each of "Comparative Examples 8-A1 to 5" in the left column of Table 16, similarly, the conditions of the coil thickness in the simulation related to the comparative example, the Q value calculated by simulation, the loss and the resistance are shown in sequence. In addition, the simulation was performed by setting the frequency of the alternating current supplied to the coil component to 1.1 MHz, 6.78 MHz, and 13.56 MHz.

[0434] It is obvious from Table 16 that the Q value of the coil components of each embodiment 8-1 to 8-5 is higher than the Q value of the corresponding comparative example. In addition, the loss on the coil components of each embodiment 8-1 to 8-5 is lower than the loss of the comparative example. In addition, regarding the AC resistance, the coil components of each embodiment 8-1 to 8-5 are also lower than the comparative example.

[0435] From the simulation results shown in Table 16, the performance levels of the coil components of Embodiments 8-1 to 8-5 can be confirmed.

[0436] Next, Fig.17 Shown for illustration Figures 2 to 5 A graph showing the relationship between the thickness of the planar coils (11, 12) and the AC resistance in the coil component according to the embodiment shown. Fig.18 Shown for illustration Figures 2 to 5A graph showing the relationship between the thickness of the planar coils (11, 12) and the Q value in the coil component of the embodiment shown. Fig.17 as well as Fig.18 The calculation is based on the AC resistance and Q value, which are calculated by setting a plurality of values ​​for the thickness of the first planar coil 11 and the thickness of the second planar coil 12 and changing the frequency of the supplied current. Specifically, the AC resistance and Q value are calculated based on the simulation. The simulation is performed using Femtet (registered trademark) manufactured by Murata Software Co., Ltd.

[0437] Individual conditions related to the thickness and material of the first planar coil 11 and the second planar coil 12 are as follows.

[0438] Condition 1: The material of the first planar coil 11 is copper, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.5 mm (Cu0.5 / Cu0.5).

[0439] Condition 2: The material of the first planar coil 11 is aluminum, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.25 mm (Al0.5 / Cu0.25).

[0440] Condition 3: The material of the first planar coil 11 is aluminum, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.5 mm (Al0.5 / Cu0.5).

[0441] Condition 4: The material of the first planar coil 11 is aluminum, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.1 mm (Al0.5 / Cu0.1).

[0442] Condition 5: The material of the first planar coil 11 is copper, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.25 mm (Cu0.5 / Cu0.25).

[0443] Condition 6: The material of the first planar coil 11 is copper, and the thickness is 0.5 mm. The material of the second planar coil 12 is copper, and the thickness is 0.1 mm (Cu0.5 / Cu0.1).

[0444] The common conditions in the simulation are as follows.

[0445] The conductivity of the first planar coil 11 formed of aluminum is 3.77×10 7 [S / m] The electrical conductivity of the second planar coil 12 formed of copper is 5.98×10 7 [S / m].

[0446] The relative magnetic permeability of the magnetic shield member 20 is 3000, and the relative magnetic permeability of the holding body 30 is 5.0.

[0447] · Figure 2 The width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the IV-IV line direction is 200 mm, and the width of the conductor 11E of the first planar coil 11 and the conductor 12E of the second planar coil 12 in the direction orthogonal to the IV-IV line is 200 mm.

[0448] Fig.17 as well as Fig.18 In the figure, the line represented by the reference numeral S1 shows the result of condition 1 (Cu0.5 / Cu0.5), the line represented by the reference numeral S2 shows the result of condition 2 (Al0.5 / Cu0.25), the line represented by the reference numeral S3 shows the result of condition 3 (Al0.5 / Cu0.5), the line represented by the reference numeral S4 shows the result of condition 4 (Al0.5 / Cu0.1), the line represented by the reference numeral S5 shows the result of condition 5 (Cu0.5 / Cu0.25), and the line represented by the reference numeral S6 shows the result of condition 6 (Cu0.5 / Cu0.1).

[0449] Reference Fig.17 For example, under conditions 2 and 5 where the thickness of the second planar coil is 0.25 mm, when the frequency of the supplied current is between 80 KHz and 200 KHz, the AC resistance is lower than that under other conditions. Fig.18 ,Under conditions 2 and 5, the Q value is higher than that under other conditions.

[0450] In addition, under conditions 4 and 6 where the thickness of the second planar coil is 0.1 mm, when the frequency of the supplied current is between 200 KHz and 1 MHz, the AC resistance is lower than that under the other conditions. Fig.18 ,Under conditions 4 and 6, the Q value is high in a wider range than that of other conditions.

[0451] In addition, under conditions 1 and 3 where the thickness of the second planar coil is 0.5 mm, the AC resistance is lower than the other conditions when the frequency of the supplied current is 1.1 MHz or higher. Specifically, for condition 1, the AC resistance is lower than the other conditions between 1.1 MHz and 13.56 MHz, and for condition 3, the AC resistance is lower than the other conditions except condition 1 between 1 MHz and 7 MHz. Fig.18 ,Under conditions 1 and 3, the Q value is high in a wider range than that of other conditions.

[0452] Under the conditions 2 and 5 where the thickness of the second planar coil is 0.25 mm, when the frequency of the supplied current is between 80 KHz and 200 KHz, the AC resistance is lower and the Q value is higher than that under the other conditions. Fig.17 as well as Fig.18 The above tendency and multiple simulations and experiments showing the same tendency have found that the coil component of the above-mentioned embodiment 6-2 has a range corresponding to the coil component of the embodiment 6-2. Fig.17 as well as Fig.18 The reference numeral E1 in FIG. Fig.17 As a result, it can be said that the coil component of embodiment 6-2 functions so as to generate a magnetic field in a manner that minimizes AC resistance. Therefore, it can be said that in the coil component of embodiment 6-2, when an AC current of 100 KHz or more and less than 200 KHz is supplied, or an AC magnetic field of 100 KHz or more and less than 200 KHz is supplied, the multilayered planar coils (11, 12) function efficiently. Furthermore, according to Fig.18 It can be seen from the results that efficient transmission can be achieved.

[0453] It should be noted that Fig.17 The results are the evaluation results when an AC current is supplied and a magnetic field is generated, but in the case of receiving an AC magnetic field and generating an AC current, the AC resistance is also suppressed as much as possible. Therefore, Fig.17 The evaluation results confirmed that the coil component of embodiment 6-2 functions effectively when supplied with an AC magnetic field of 100 KHz or more and less than 200 KHz.

[0454] In addition, under conditions 4 and 6 where the thickness of the second planar coil is 0.1 mm, when the frequency of the supplied current is between 200 KHz and 1 MHz, the AC resistance is lower and the Q value is higher than that under the other conditions. Fig.17 as well as Fig.18 The above tendency and multiple simulations, experiments, etc. showing the same tendency were found to reveal the coil component of embodiment 7-2. The range corresponding to the coil component of embodiment 7-2 is Fig.17 as well as Fig.18 The reference numeral E2 in FIG. Fig.17As a result, it can be said that the coil component of embodiment 7-2 also functions to generate a magnetic field in a manner that minimizes AC resistance. Therefore, it can be said that in the coil component of embodiment 7-2, when an AC current of 200 KHz or more and 1 MHz or an AC magnetic field of 200 KHz or more and 1 MHz or less is supplied, the multilayered planar coils (11, 12) function efficiently. Furthermore, according to Fig.18 It can be seen from the results that efficient transmission can be achieved.

[0455] In addition, under conditions 1 and 3 where the thickness of the second planar coil is 0.5 mm, when the frequency of the supplied current is 1.1 MHz or more, the AC resistance is lower and the Q value is higher than that under the other conditions. Fig.17 as well as Fig.18 The above tendency and multiple simulations, experiments, etc. showing the same tendency were found to reveal the coil component of embodiment 8-2. The range corresponding to the coil component of embodiment 8-2 is Fig.17 as well as Fig.18 The reference numerals in the figure are surrounded by E3. Fig.17 As a result, it can be said that the coil component of embodiment 8-2 also functions to generate a magnetic field in a manner that minimizes AC resistance. Therefore, it can be said that in the coil component of embodiment 8-2, when an AC current of 1.1 MHz or more is supplied, or an AC magnetic field of 1.1 MHz or more is supplied, the multilayered planar coils (11, 12) function efficiently. Furthermore, according to Fig.18 It can be seen from the results that efficient transmission can be achieved.

[0456] Strictly speaking, in the coil component of embodiment 8-2 involved in condition 1 (Cu0.5 / Cu0.5), when an alternating current or an alternating magnetic field is supplied between 1.1 MHz and 13.56 MHz, the multilayered planar coils (11, 12) function efficiently. In addition, in the coil component of embodiment 8-2 involved in condition 3 (AL0.5 / Cu0.5), when an alternating current or an alternating magnetic field is supplied between 1.1 MHz and 7 MHz, the multilayered planar coils (11, 12) function efficiently.

[0457] Although the embodiments of the present disclosure have been described above, various modifications may be added to the above embodiments. Such modifications may also be included in the technical scope of the present disclosure.

[0458] Reference numerals

[0459] S Power transmission system

[0460] 1 Power transmission device

[0461] 1A high frequency current supply unit

[0462] 2 Power receiving device

[0463] 2A conversion unit

[0464] 10, 10', 10A coil parts

[0465] 11. First planar coil

[0466] 11n Turn

[0467] 11ns1 first straight line section

[0468] 11nc1 first corner part

[0469] 11ns2 Second straight line section

[0470] 11nc2 second corner part

[0471] 11ns3 The third straight line section

[0472] 11nc3 third corner part

[0473] 11E Conductor

[0474] 12. Second planar coil

[0475] 12n Turn

[0476] 12ns1 first straight line section

[0477] 12nc1 first corner part

[0478] 12ns2 Second straight line section

[0479] 12nc2 second corner part

[0480] 12ns3 The third straight line section

[0481] 12nc3 third corner part

[0482] 12E Conductor

[0483] 14 Connect the wiring section

[0484] 20 Magnetic shielding components

[0485] 30 Keep body

[0486] 31 First floor

[0487] 32 Second Floor

[0488] 33 Third Floor

[0489] 34 Wall

[0490] 35 Guide retaining plate

[0491] 301 First Component

[0492] 302 Second Component

[0493] 303 Third Component

[0494] 60 second magnetic shielding member

[0495] 70 Magnetic Block Material

[0496] C1 First central axis

[0497] C2 Second central axis

Claims

1. A coil component, characterized in that: have: a first planar coil; a second planar coil overlapping the first planar coil; a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism; The first planar coil and the second planar coil are connected in series, and a thickness of the second planar coil is greater than or equal to 0.15 mm and less than or equal to 0.35 mm.

2. The coil component according to claim 1, wherein The first planar coil and the second planar coil are supplied with an alternating current of 79 KHz to 90 KHz or an alternating magnetic field of 79 KHz to 90 KHz.

3. The coil component according to claim 1, wherein: have: a first magnetic shield member arranged to face a surface of the covering portion of the magnetic member opposite to a surface facing the first planar coil; a second magnetic shield member arranged to face a surface of the first magnetic shield member opposite to a surface facing the covering portion of the magnetic member; The material of the first magnetic shield member and the material of the second magnetic shield member are different from each other.

4. The coil component according to claim 3, characterized in that The volume resistivity of the first magnetic shielding member is greater than the volume resistivity of the second magnetic shielding member, The relative magnetic permeability of the first magnetic shield member is greater than the relative magnetic permeability of the second magnetic shield member.

5. The coil component according to claim 3, wherein: The first magnetic shield member includes a plate-like ferrite.

6. The coil component according to claim 3, characterized in that The first magnetic shield member has a relative magnetic permeability of 500 or more.

7. The coil component according to claim 3, characterized in that The second magnetic shield member includes aluminum.

8. The coil component according to claim 1, wherein: The covering portion of the magnetic member entirely covers the opposite surfaces of the first planar coil.

9. The coil component according to claim 1, wherein: The covering portion of the magnetic member partially covers the opposite faces of the first planar coil.

10. The coil component according to claim 9, wherein: The magnetic component includes a plurality of members separated from each other.

11. The coil component according to claim 9, wherein The first planar coil includes a straight line portion extending along a straight line, and a corner portion connected to the straight line portion and extending in a curved shape. The covering portion of the magnetic member covers the straight portion and does not cover the corner portion.

12. A power transmission device, characterized in that: A coil component according to any one of claims 1 to 11.

13. The power transmission device according to claim 12, wherein: The device further includes a high-frequency current supply unit configured to supply an alternating current of 79 kHz to 90 kHz to the coil component.

14. A power receiving device, characterized in that: A coil component according to any one of claims 1 to 11.

15. The power receiving device according to claim 14, wherein: The invention further includes a conversion unit that converts an alternating current of 79 kHz to 90 kHz, which is generated by electromagnetic induction in the coil component, into a direct current.

16. A power transmission system, characterized in that: A power transmission device and a power reception device are provided, and at least any one of the power transmission device and the power reception device includes the coil component according to any one of claims 1 to 11.

17. A method for transmitting electric power, characterized in that: have: A step of supplying an alternating current of 79 kHz or more and 90 kHz or less to the coil component in a power transmission device including the coil component according to any one of claims 1 to 11; a step of generating a current in a power receiving device based on the magnetic field generated in the power transmitting device.

18. A coil component, characterized in that: have: a first planar coil; a second planar coil overlapping the first planar coil; a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism; The first planar coil and the second planar coil are connected in series, The thickness of the second planar coil is greater than or equal to 0.225 mm and less than or equal to 0.275 mm. The first planar coil and the second planar coil are supplied with an alternating current of 100 KHz or more and less than 200 KHz, or are supplied with an alternating magnetic field of 100 KHz or more and less than 200 KHz.

19. A coil component, characterized in that: have: a first planar coil; a second planar coil overlapping the first planar coil; a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism; The first planar coil and the second planar coil are connected in series, The thickness of the second planar coil is greater than or equal to 0.075 mm and less than or equal to 0.175 mm. The first planar coil and the second planar coil are supplied with an alternating current of 200 KHz to 1 MHz or an alternating magnetic field of 200 KHz to 1 MHz.

20. A coil component, characterized in that: have: a first planar coil; a second planar coil overlapping the first planar coil; a magnetic member including a portion covering a surface of the first planar coil opposite to a surface facing the second planar coil and having magnetism; The first planar coil and the second planar coil are connected in series, The thickness of the second planar coil is greater than 0.45 mm. The first planar coil and the second planar coil are supplied with an alternating current of 1.1 MHz or higher, or with an alternating magnetic field of 1.1 MHz or higher.

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