Components for wireless power supply

Abstract

To provide a wireless power supply system to improve power supply efficiency by increasing inductance and a Q value, and reducing impedance.SOLUTION: In a coil component 12 for wireless power supply, a magnetic body 3 is arranged on one face 21 side, an air-core portion 22 and an outer portion 23 of a coil 2, the coil 2, a magnetic body 32 arranged on the air-core portion 22 of the coil 2, and a magnetic body 33 arranged on the outer portion 23 of the coil 2 are respectively spaced apart from each other.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a wireless power supply component used in a wireless power supply system, and more particularly to a wireless power supply component used in a wireless power supply system that uses electromagnetic induction with a coil. [Background technology]

[0002] A wireless power transfer system is a system that transfers power without using metal contacts, and is also called a wireless power transfer system. There are several types of wireless power transfer methods, including the electromagnetic induction method, which uses electromagnetic induction with a coil, and the magnetic field resonance method, which is an improved version of the electromagnetic induction method.

[0003] Such a wireless power transmission system using electromagnetic induction with coils uses a power transmitting coil (hereinafter referred to as the "power transmitting coil") and a power receiving coil (hereinafter referred to as the "power receiving coil"), and generates a magnetic field by passing electricity through the power transmitting coil, which is received by the power receiving coil, causing an induced current to flow and the power receiving coil to receive power. Also, the magnetic field resonance system has a resonant circuit including a power transmitting coil and a resonant circuit including a power receiving coil, and when a current flows through the power transmitting coil, the generated magnetic field vibration is transmitted to the resonant circuit on the power receiving side, causing a current to flow.

[0004] In such wireless power transfer systems using electromagnetic induction, the power transmitting coil and the power receiving coil are placed opposite each other. Since power is transferred from the power transmitting coil through magnetic flux passing through the power receiving coil, if there is a large amount of leakage flux, which is the magnetic flux generated in the power transmitting coil that does not enter the power receiving coil, the efficiency of power transfer decreases.

[0005] Therefore, in the past, to prevent magnetic flux leakage, magnetic sheets made of ferrite soft magnetic material or the like have been installed on the back side of both the power transmitting coil and the power receiving coil as magnetic shielding components (Patent Document 1).However, because this magnetic material is only installed on the back side of each of the power transmitting coil and the power receiving coil, i.e., on the side where the power transmitting coil and the power receiving coil do not face each other, there has been a problem in that some magnetic flux leaks, and power supply efficiency does not improve.

[0006] Specifically, there are upper limits to the Q value, which is the efficiency with which a coil generates a magnetic field, and the inductance value, which is a coefficient related to the induced electromotive force transmitted from the transmitting coil to the receiving coil, so magnetic force cannot be transmitted efficiently to the receiving coil. In addition, there is a proximity effect, which limits the amount of current flowing through the coil due to the generated magnetic force, so power supply efficiency does not increase beyond a certain level.

[0007] Therefore, the power supply efficiency has been improved by using Litz wire as the coil material, because Litz wire is a wire made by bundling and twisting multiple enameled wires together, and it can suppress the increase in AC resistance caused by the skin effect and proximity effect that are unique to high frequencies.

[0008] Also, a coil structure has been proposed that includes a first magnetic body part, a second magnetic body part, a third magnetic body part that is arranged between the first magnetic body part and the second magnetic body part and has an area smaller than the first magnetic body part and the second magnetic body part, and a coil wound around the third magnetic body part (Patent Document 2).

[0009] Furthermore, magnetic materials such as ferrite have been used as magnetic shielding components for absorbing electromagnetic waves, such as magnetic sheets and magnetic material parts in the prior art. However, to protect the magnetic material, a ferrite sheet has been proposed in which a flat ferrite core is attached to a protective sheet via an adhesive layer (Patent Document 3). In this ferrite sheet, a polyester film with electrical insulation and flexibility is used as the protective sheet. Furthermore, the protective sheet is attached to only one side of the ferrite core, leaving the ferrite core partially exposed.

[0010] However, in the prior art of Patent Document 3, a protective sheet made of easily breakable polyester film is used, which means that the ferrite core is not sufficiently protected, making it prone to breakage and furthermore, there is a risk of other components being damaged by its fragments. Also, because the ferrite core is installed in a partially exposed state, there is a risk of the ferrite core not being sufficiently protected, making it prone to breakage and furthermore, there is a risk of other components being damaged by its fragments.

[0011] Another proposed component for electromagnetic wave countermeasures is an electromagnetic wave suppression sheet in which multiple small, plate-shaped ferrite plates are arranged horizontally inside a protective sheet made of a polymer material such as silicone resin or acrylic resin (Patent Document 4). According to the prior art of Patent Document 4, the ferrite plates are completely covered by the protective sheet, which is more effective at preventing damage to the ferrite plates than the prior art of Patent Document 2. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-206234 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-37955 [Patent Document 3] Japanese Patent Application Laid-Open No. 2007-273671 [Patent Document 4] Japanese Patent Application Laid-Open No. 2009-170548 Summary of the Invention [Problem to be solved by the invention]

[0013] However, when the power transmitting coil and power receiving coil are constructed using coils made of litz wire, the outer diameter of the litz wire becomes large because it is a twisted wire, which makes it difficult to make the coil thinner or the components more compact.In addition, even with coils made of litz wire, there is a demand for improved power supply efficiency.

[0014] Furthermore, in the coil structure described in Patent Document 2, magnetic materials are arranged on the front side of each of the power transmitting coil and the power receiving coil, i.e., on the side where the power transmitting coil and the power receiving coil face each other. This reduces the inductance, which in turn reduces the Q value, resulting in a problem of deteriorating power supply efficiency.

[0015] Furthermore, the electromagnetic wave suppression sheets described in Patent Documents 3 and 4 use a hard synthetic resin sheet as a protective sheet for the magnetic material (electromagnetic wave absorber), which means that the protective sheet has a low elastic limit and insufficient elasticity, making the protective sheet itself susceptible to damage due to stress from bending or pressure on the electromagnetic wave suppression sheet.Furthermore, damage to the protective sheet results in insufficient protection of the ferrite, making the ferrite susceptible to damage.Furthermore, if the ferrite breaks, fragments may fly off, damaging other components or injuring the user.

[0016] Furthermore, the electromagnetic wave suppression sheets described in Patent Documents 3 and 4 have a synthetic resin protective sheet for the electromagnetic wave absorber, which has a high elastic modulus and low flexibility, so that bending, pressing, or other stress on the electromagnetic wave suppression sheet directly applies stress to the ferrite, making the ferrite susceptible to damage. Furthermore, when the electromagnetic wave suppression sheet comes into contact with other components, the protective sheet is unable to absorb the irregularities of the other components, limiting the installation location and reducing the degree of installation flexibility.

[0017] Therefore, one of the objects of the present invention is to improve the inductance and Q value, reduce the impedance, and improve the power supply efficiency in wireless power supply.

[0018] Another object is to reliably protect magnetic materials such as ferrite used in wireless power supply components and prevent damage to the magnetic materials and the wireless power supply components. Another object is to prevent fragments from scattering even if the magnetic material used in the wireless power supply components is damaged, thereby preventing damage to other components and injury to the user. Another object is to enable a wireless power supply component having a magnetic material to absorb unevenness of other components when it comes into contact with other components during installation, thereby reducing restrictions on installation location and increasing installation flexibility. [Means for solving the problem]

[0019] The present invention, which aims to solve the above-mentioned problems, provides a wireless power supply component in which a magnetic body is disposed on one side of a coil and in an air-core portion.

[0020] The wireless power supply component has a magnetic material disposed on one side of the coil and on the outer side thereof.

[0021] The wireless power supply component has magnetic materials disposed on one side of the coil, in the air-core portion, and on the outer side.

[0022] In the wireless power supply component, the magnetic body is partially or entirely covered with an elastomer protective member.

[0023] In addition, in the above-mentioned wireless power supply component, the coil and the magnetic material arranged in the air-core portion of the coil, and / or the coil and the magnetic material arranged on the outer side of the coil are separated from each other in the wireless power supply component.

[0024] In addition, in the above wireless power supply component, the magnetic body is at least partially covered with an elastomer protective member, and an adhesive is laminated between the magnetic body and the elastomer protective member.

[0025] In addition, in the above-mentioned wireless power supply component, the magnetic body is partially covered with an elastomer protective member, and a portion or the entire portion of the magnetic body that is not covered with the elastomer protective member is covered with an adhesive.

[0026] In the wireless power supply component, the elastomer protective member is made of rubber, a thermoplastic elastomer, or a thermosetting elastomer other than rubber.

[0027] In the wireless power supply component, the magnetic material is in powder and / or granular form.

[0028] In the wireless power supply component, the elastomer protective member is provided with a heat sink.

[0029] The present invention also provides a wireless power transmission device including the above-described wireless power supply component.

[0030] Also, there is provided a wireless power receiving device including the above-mentioned wireless power supply component.

[0031] The present invention also provides a wireless power supply system in which a wireless power transmitting device and / or a wireless power receiving device includes the wireless power supply component. [Effects of the Invention]

[0032] According to the present invention as described above, in wireless power supply, a magnetic body is arranged not only on one side of the coil but also in the air-core portion and / or outer portion of the coil, thereby suppressing leakage of magnetic flux, thereby improving inductance and Q value, reducing impedance, and improving power supply efficiency.

[0033] Furthermore, because the magnetic material, such as ferrite, used in the wireless power supply component is covered with an elastomer protective member, the magnetic material is reliably protected and damage to the magnetic material and the wireless power supply component can be prevented. Furthermore, by covering the entire surface of the magnetic material with the elastomer protective member, the magnetic material is more reliably protected and damage to the magnetic material and the wireless power supply component can be prevented. Even if the magnetic material in the wireless power supply component is damaged, scattering of the broken pieces can be prevented, preventing damage to other components and injury to the user. Furthermore, because the magnetic material is covered with an elastomer protective member, it is flexible and can absorb unevenness of other components when it comes into contact with other components during installation of the wireless power supply component, reducing installation location restrictions and increasing installation flexibility. [Brief explanation of the drawings]

[0034] [Figure 1] A perspective view of an embodiment of the present invention [Figure 2] Figure 1A-A cross section [Figure 3] Perspective view of another embodiment of the present invention [Figure 4] Figure 3B-B cross section [Figure 5] Perspective view of another embodiment of the present invention [Figure 6] Figure 5C-C cross section [Figure 7] Perspective view of another embodiment of the present invention [Figure 8] Figure 7D-D cross section [Figure 9] Perspective view of another embodiment of the present invention [Figure 10] Figure 9E-E cross section [Figure 11] Perspective view of another embodiment of the present invention [Figure 12] Figure 11F-F cross section [Figure 13] Cross-sectional view of an embodiment equipped with an elastomer protective member [Figure 14] Cross-sectional view of another embodiment equipped with an elastomer protective member [Figure 15] Cross-sectional view of another embodiment equipped with an elastomer protective member [Figure 16] Cross-sectional view of an example of integrally molding magnetic parts [Figure 17] Cross-sectional view of another embodiment equipped with an elastomer protective member [Figure 18] Manufacturing process diagram of an example of a magnetic part [Figure 19] Perspective view of an example of a magnetic component equipped with an elastomer protective member [Figure 20] Cross-sectional view of an example of a magnetic part equipped with an elastomer protective member [Figure 21] Schematic block diagram of one embodiment of the wireless power supply system of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0035] The wireless power supply component of the present invention is a coil component for wireless power supply (hereinafter also referred to as "coil component") in which a magnetic body is disposed on one side of the coil and in the air-core portion and / or the outer portion.

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in different embodiments and drawings, identical parts are designated by the same reference numerals, and redundant description will be omitted. As shown in FIGS. 1 and 2 , a wireless power supply coil component 10, which is a wireless power supply component of the present invention, includes a planar coil 2 and a magnetic body 3. A flat-plate-shaped magnetic body 31 is disposed on one surface 21 of the coil 2, and a cylindrical magnetic body 32 is disposed in an air-core portion 22, which is the innermost portion of the coil 2. In other words, the coil component 10 is configured such that the coil 2 is disposed on an upper surface 311 of the flat-plate-shaped magnetic body 31, and the magnetic body 32 is disposed on the upper surface 311 of the magnetic body 31 in the air-core portion 22 of the coil 2. By disposing the magnetic body 32 in the air-core portion 22 of the coil 2, it is possible to adjust and stabilize the flow of magnetic flux generated from the coil. Furthermore, the values ​​of self-inductance, Q value, and mutual inductance can be improved, thereby improving power supply efficiency.

[0037] Furthermore, the coil 2 and the magnetic body 32 are spaced apart. The magnetic body 32 may be in contact with the innermost periphery of the coil 2 and fitted into the air-core portion 22, as in the coil component 15 shown in FIGS. 3 and 4 , but it is preferable that the magnetic body 32 is configured not to contact the innermost periphery of the coil 2. This is because a separation between the coil 2 and the magnetic body 32 allows for a smoother flow of magnetic flux and can further improve power supply efficiency. When the coil 2 and the magnetic body 32 are spaced apart, it is preferable that the air-core portion 22 and the magnetic body 32 are concentric. Furthermore, the diameter of the magnetic body 32 is not limited to this value, but is preferably 85 to 95% of the diameter of the air-core portion 22, more preferably 88 to 92%, in order to improve power supply efficiency.

[0038] The coil 2 is an air-core planar coil formed by winding a solid copper wire. The coil 2 is configured by winding a portion of the copper wire in a spiral shape, with lead wires 28 drawn out from the outermost and innermost circumferences. Note that the coil may be made of other materials such as Litz wire instead of solid copper wire. Furthermore, the coil is not limited to a flat planar coil, and a coil in which multiple coils are stacked may also be used.

[0039] Coil 2 constitutes a power receiving coil on the power receiving side and a power transmitting coil on the power transmitting side in a wireless power transfer system. When a power receiving coil and a power transmitting coil are arranged opposite each other in a wireless power transfer system, coil component 10 has magnetic body 31 arranged only on one surface 21 on the side that does not face each other. Magnetic body 31 is not arranged on one surface 29 on the opposing side. In other words, coil component 10 has magnetic body 31 arranged only on one surface of coil 2, and magnetic body 31 is not arranged on both surfaces of coil 2. This is because if a magnetic body is arranged on one surface 29 on the opposing side, power transfer efficiency will deteriorate.

[0040] The magnetic body 31 is composed of a single flat-plate magnetic body, but may be composed of multiple magnetic bodies connected together. The thickness of the magnetic body 31 is not particularly limited, and it is not limited to a flat plate, and may be composed of a block-shaped magnetic body. The magnetic body 31 has an area equal to or larger than the winding portion 20 of the coil 2, excluding the lead wire 28. In a plan view, the winding portion 20 of the coil 2 overlaps the magnetic body 31 and does not protrude from the magnetic body 31. The magnetic body 32 is composed of a single cylindrical magnetic body, but is sized to correspond to the shape and size of the air-core portion 22 of the coil 2, with a planar shape similar or identical to that of the air-core portion 22, so that it can be inserted into the air-core portion 22. However, a different planar shape is also acceptable. The height of the magnetic body 32 may be less than or greater than the thickness of the coil 2, but is preferably greater than the thickness of the coil 2. This configuration allows for smoother flow of magnetic flux and further improves power supply efficiency.

[0041] 5 and 6 , a coil component 11 for wireless power transfer includes a planar coil 2 and a magnetic body 3. When a power receiving coil and a power transmitting coil are arranged opposite each other in a wireless power transfer system, a planar magnetic body 31 is disposed on one surface 21 of the coil 2 that does not face each other. A ring-shaped magnetic body 33 having an opening 337 is disposed on an outer portion 230, which is a position facing the outermost side surface 23 of the coil 2. In other words, the coil component 11 is configured such that the coil 2 is disposed on the upper surface 311 of the planar magnetic body 31, and the magnetic body 33 is disposed on the upper surface 311 of the magnetic body 31 and on the outer portion 230 of the coil 2. By disposing the magnetic body 33 on the outer portion 230 of the coil 2, leakage of magnetic flux to the outside of the coil is suppressed and stabilized, thereby further improving power transfer efficiency. Furthermore, the values ​​of self-inductance, Q value, and mutual inductance can be improved, thereby improving power transfer efficiency.

[0042] In the coil component 11, the lead wire 28 of the coil 2 is disposed in the opening 337 of the magnetic body 33. The magnetic body 33 is formed of a single annular magnetic body, but may be formed by stacking multiple annular magnetic bodies, or may be formed by connecting multiple arc-shaped magnetic bodies. The coil 2 and the magnetic body 33 are spaced apart. As in the coil component 16 shown in FIGS. 7 and 8, the side surface 23 of the coil 2 and the magnetic body 33 may be in contact with each other, but a non-contact configuration is preferred. This is because a separation between the coil 2 and the magnetic body 33 allows for smoother flow of magnetic flux and can further improve power supply efficiency. When the coil 2 and the magnetic body 33 are spaced apart, the coil 2 and the magnetic body 33 are preferably concentric. Furthermore, the size of the magnetic body 33 is not particularly limited as long as it can be placed on the upper surface 311 of the magnetic body 31, but in order to achieve better power supply efficiency, it is preferable that the distance between the side surface 23 of the coil 2 and the magnetic body 33 be within three times the coil radius, and more preferably within two times the coil radius.

[0043] The height of the magnetic body 33 may be less than or greater than the thickness of the coil 2, but is preferably greater than or equal to the thickness of the coil 2, and is preferably configured so that the coil 2 is hidden by the magnetic body 33 in a side view. This is because such a configuration reduces leakage of magnetic flux to the outside, thereby further improving power supply efficiency. Furthermore, the thickness of the magnetic body 33, in other words, the difference between the inner diameter and outer diameter of the magnetic body 33, is not particularly limited, but is preferably less than the radius of the coil.

[0044] It is desirable that the magnetic body 33 has an opening 337 as narrow as possible, covers as much of the side surface 23 of the coil 2 as possible, and has a configuration with as small a gap as possible, because this makes it difficult for magnetic flux to leak out. However, it can also be configured to be installed on at least a part of the outer portion 230 of the coil 2, and is not limited to a ring or arc shape, but can be a rectangle with an opening 337, another polygon, an ellipse, or a shape combining straight lines and curves. Furthermore, it can be configured with multiple divided members, and have openings other than the opening 337 for arranging the lead wire 28 of the coil 2, to form a configuration with gaps.

[0045] 9 and 10 , a coil component 12 for wireless power supply includes a planar coil 2 and a magnetic body 3, in which a flat magnetic body 31 is disposed on one surface 21 of the coil 2, a cylindrical magnetic body 32 is disposed in the air-core portion 22 of the coil 2, and an annular magnetic body 33 having an opening 337 in a portion thereof is disposed in the outer portion 230 of the coil 2. In other words, the coil component 12 is configured such that the coil 2 is disposed on the upper surface 311 of the flat magnetic body 31, the magnetic body 32 is disposed in the air-core portion 22 of the coil 2 on the upper surface 311 of the magnetic body 31, and the magnetic body 33 is disposed in the outer portion 230 of the coil 2. By disposing the magnetic bodies 32 and 33 in the air-core portion 22 and the outer portion 230 of the coil 2, it is possible to stabilize and smooth the flow of magnetic flux more than by disposing either the magnetic body 32 or the magnetic body 33 in addition to the magnetic body 31, and it is possible to further improve power supply efficiency. This also improves the self-inductance, Q value, and mutual inductance values, thereby improving power supply efficiency.

[0046] Furthermore, the coil 2 and the magnetic body 32 are spaced apart, and the coil 2 and the magnetic body 33 are also spaced apart. The magnetic body 32 may be in contact with the innermost periphery of the coil 2, fitted into the air-core portion 22, and in contact with the side surface 23 of the coil 2, as in the coil component 17 shown in FIGS. 11 and 12 . Alternatively, as shown in the figures, one of the magnetic bodies 32 and 33 may be spaced apart from the coil 2, while the other is in contact with the coil 2. However, it is preferable that the magnetic bodies 32 and 33 do not contact the coil 2. Spaced apart from the coil 2, the magnetic body 32 and the magnetic body 33, allows for smoother flow of magnetic flux and improves power supply efficiency. The diameter of the magnetic body 32 is not limited to this value, but is preferably 85 to 95% of the diameter of the air-core portion 22, more preferably 88 to 92%, to improve power supply efficiency. Furthermore, the distance between the side surface 23 of the coil 2 and the magnetic body 33 is preferably within three times the coil radius, and more preferably within two times the coil radius.

[0047] The magnetic body 3 is an electromagnetic wave adjusting member, and is not particularly limited as long as it is a soft magnetic body, and ferrite, iron, permalloy, silicon iron, etc. can be used. The magnetic body 3 is preferably made of ferrite (soft ferrite) because it has high electromagnetic wave absorption capacity and high electrical resistance. Furthermore, ferrite has high electrical resistance, making it difficult for current to flow through it, and is a material similar to an insulator. For this reason, it is characterized by low heat generation, in other words, low heat loss, and because there is little loss of magnetic energy of electromagnetic waves, magnetic force (energy) can be transmitted efficiently.

[0048] Ferrite is a material that absorbs magnetic flux well, but among ferrites, Mn-Zn ferrite is more preferable because it is highly effective against electromagnetic waves of relatively low frequencies (1 MHz or less), has high magnetic permeability, and has a high magnetic flux density.

[0049] The magnetic body may be formed of a single magnetic material, or may be formed of multiple magnetic materials of a predetermined shape. Furthermore, the flat magnetic body 31 arranged on one surface 21 of the coil 2, the magnetic body 32 arranged in the air-core portion 22 of the coil 2, and the annular magnetic body 33 arranged in the outer portion 230 of the coil 2 may be formed separately, or may be formed by integrally molding the magnetic bodies 31 and 32, the magnetic bodies 31 and 33, or the magnetic bodies 31, 32, and 33.

[0050] As shown in Figures 1 to 12, the magnetic body may be configured so that the material of the magnetic body is exposed, but it is preferable that the magnetic body be configured as a composite material in which part or all of the magnetic body is covered with an elastomer protective member. This configuration protects the magnetic body, prevents damage to the magnetic body, and even if it is damaged, prevents fragments from scattering, provides flexibility, and increases the degree of freedom in installation. Here, a part configured so that the magnetic body is covered with an elastomer protective member is called a magnetic body part.

[0051] As a specific configuration of a magnetic component and a coil component for wireless power supply in which the magnetic material is covered with an elastomer protective member, as shown in Figure 13, the coil component 101 has a magnetic material component 5, and the magnetic material component 5 has two magnetic material components 51 and 52, the magnetic material component 51 arranged on one surface 21 of the coil 2 has one plate-shaped magnetic material 31, and the magnetic material component 52 arranged in the hollow core portion 22 of the coil 2 has one cylindrical magnetic material 32, and the magnetic material 31 and the magnetic material 32 are not exposed from the elastomer protective member 4, and the entire surface is completely covered with the elastomer protective member 4.

[0052] Also, as shown in Figure 14, the coil part 102 has a magnetic part 5, and the magnetic part 5 has two magnetic parts 51 and 53, and the magnetic part 51 has one plate-shaped magnetic body 31, and the magnetic part 53 arranged on the outer part 230 of the coil 2 has one ring-shaped magnetic body 33 with an opening in one part, and the magnetic bodies 31 and 33 are not exposed from the elastomer protective member 4, and the entire surface can be completely covered with the elastomer protective member 4.

[0053] Also, as shown in FIG. 15 , the coil part 103 includes a magnetic part 5, and the magnetic part 5 includes three magnetic parts 51, 52, and 53, and the magnetic part 51 includes one plate-shaped magnetic body 31, the magnetic part 52 includes one cylindrical magnetic body 32, and the magnetic part 53 includes one ring-shaped magnetic body 33 with an opening in a portion thereof, and the magnetic bodies 31, 32, and 33 are not exposed from the elastomer protective member 4, and the entire surface can be completely covered with the elastomer protective member 4.

[0054] The magnetic material parts 5 are constructed as separate parts for each magnetic installation location on one side 21 of the coil 2, the air-core portion 22, and the outer portion 230, and as necessary, the magnetic material part 51 on one side 21 of the coil 2, the magnetic material part 52 on the air-core portion 22, and the magnetic material part 53 on the outer portion 230 are fixed by bonding, welding, etc. with an adhesive or the like.

[0055] The magnetic component 5 may also be integrally molded in whole or in part. In the case of an integrally molded magnetic component 5, taking a magnetic component 5 having a plate-shaped magnetic body 31 and a cylindrical magnetic body 32 as an example, as shown in FIG. 16, the magnetic bodies are prepared for each installation location and fixed in advance with adhesive 7 (FIG. 16(a)) or not (FIG. 16(b)). The magnetic bodies 31, 32 can be partially or entirely covered with an elastomer protective member 4 to form an integral structure. The magnetic bodies 31, 32 may be separated by an elastomer protective member 4 so that they do not come into contact with each other (FIG. 16(c)). Alternatively, the magnetic bodies 31, 32 may be in contact with each other without an elastomer protective member 4 (FIG. 16(b)). The elastomer protective member also functions as an adhesive or bonding agent between the magnetic bodies. A flexible synthetic resin adhesive can be used as the adhesive.

[0056] Furthermore, although not shown, an adhesive may be laminated between the elastomer protective member 4 and the magnetic body 3, and the elastomer protective member 4 and the magnetic body 3 may be bonded together with the adhesive. With this configuration, the magnetic body 3 can be more securely fixed within the elastomer protective member 4. The adhesive may be made of a synthetic resin that is flexible and pliable.

[0057] 1 to 16, the number of magnetic bodies 3 installed in one coil component is one per installation location on one surface 21 of the coil 2, the air-core portion 22, and the outer portion 230, but this is not limited to this, and although not shown, multiple magnetic bodies may be installed in one installation location, lined up in the horizontal and / or vertical directions. Furthermore, when multiple magnetic bodies are installed in one installation location, the installed multiple magnetic bodies may all have the same shape, or may have different shapes.

[0058] As shown in FIG. 17, the magnetic material 3 used in the magnetic component 5 can be multiple powdery and / or granular magnetic materials 3, which are placed inside the elastomer protective member 4 with only a portion or all of them exposed. This configuration provides the magnetic component with flexibility and allows it to be used on surfaces other than flat surfaces. The powdery and / or granular magnetic materials can be dispersed inside the elastomer protective member 4 (FIG. 17(a)), or can be aggregated in one or more locations in the form of a plate or block, such as a plate placed on a substantially coplanar surface (FIG. 17(b)). While FIG. 17 illustrates the magnetic component 5 placed on one side of the coil, multiple powdery and / or granular magnetic materials can also be used in the magnetic component in the hollow core or outer portion of the coil. Alternatively, all or part of the magnetic material components on one side of the coil, the magnetic material components in the air-core portion, and the magnetic material components in the outer portion may be integrally molded using powdered and / or granular magnetic material. Alternatively, one of the magnetic material components may be an integral magnetic material, and the others may be made of powdered and / or granular magnetic material.

[0059] The size of the powdered and / or granular magnetic material is not particularly limited, but in the case of ferrite, particles with a particle size of about 0.35 to 5 mm are preferred, and particles with a particle size of about 1 to 2 mm are more preferred. A particle size of 0.35 mm or more provides good electromagnetic wave absorption and control performance regardless of frequency, while particles larger than 5 mm, which are too coarse, result in insufficient flexibility of the magnetic component. Furthermore, the particle sizes of the multiple magnetic materials installed in the magnetic component may all be the same or may be different.

[0060] The filling rate of the magnetic material, in volume ratio, is preferably 10 to 150 vol% for 100 parts of the elastomer in the magnetic part. If the ratio of magnetic material to elastomer is lower than this, the ability to absorb and control electromagnetic waves will be insufficient, and if it is higher, the softness, flexibility, and elasticity will be low, making it difficult to bend sufficiently and increasing costs. From these viewpoints, the filling rate of the magnetic material, in volume ratio, is more preferably 40 to 125 vol%, and even more preferably 60 to 105 vol%, for 100 parts of the elastomer in the magnetic part.

[0061] The elastomer protective member 4 is a protective member made of an elastomer that has softness, flexibility, and rubber-like elasticity. Examples of elastomers that can be used include rubber, thermoplastic elastomers, and thermosetting elastomers other than rubber. Elastomers are preferred because they are superior in softness, flexibility, and elasticity compared to other polymeric materials, are inexpensive, and various functions can be added by changing the compounding contents. Among elastomers, rubber is also preferred because it has superior softness, flexibility, and elasticity, and various functions can be easily added by changing the compounding contents.

[0062] The rubber is not particularly limited, and may be natural rubber or synthetic rubber, either diene rubber or non-diene rubber, as long as it is a rubber whose composition is within a range that provides flexibility.

[0063] Examples of thermoplastic elastomers that can be used include, but are not limited to, copolymer ethylene vinyl acetate resin (EVA), polyvinyl chloride (PVC), polyurethane thermoplastic elastomers, etc. Examples of thermosetting elastomers that can be used include, but are not limited to, thermosetting urethane elastomers, etc.

[0064] The thickness of the elastomer protective member 4 is not particularly limited and can be a predetermined thickness depending on the thickness of the magnetic body 3 it covers, but in order to reliably protect the magnetic body 3, it is preferable that the thickness be 0.1 mm or more from the surface of the magnetic body 3. By using a magnetic component in which the magnetic body is covered with an elastomer protective member, the magnetic body and the coil will be separated even if the magnetic component and the coil are installed in contact with each other.

[0065] Here, a method for manufacturing the magnetic component 5 will be described using an example in which the magnetic body 3 is a flat-plate-shaped magnetic body 31 and the elastomer protective member 4 is made of rubber. As shown in FIG. 18, two elastomer sheets 40 made of the same material as the elastomer protective member 4, made of unvulcanized rubber, and one magnetic body 31 are prepared (FIG. 18(a)). The magnetic body 31 is placed on one of the elastomer sheets 40 in a mold 91 (FIG. 18(b)). The other elastomer sheet 40 is then placed on top of the magnetic body 31, sandwiching the magnetic body 31 between the two elastomer sheets 40 (FIG. 18(c)). Then, a mold 92 is fitted to the mold 91, and the mold 9 is closed to vulcanize the rubber, and the magnetic body 31 is fixed in a state where it is enclosed in the elastomer protective member 4 (FIG. 18(d)). In this way, a flat-plate-shaped magnetic component 5 including the magnetic body 31 is completed.

[0066] When the magnetic material 3 is in the form of multiple powders and / or granules, the magnetic material can be manufactured in the same way as a flat magnetic material. As a manufacturing method for a configuration in which the magnetic material is dispersed in three dimensions, a method can be used in which powder and / or granular magnetic material is mixed with unvulcanized rubber, kneaded, and then processed into a desired shape by placing it in a mold, etc., and then vulcanized. Alternatively, a method can be used in which magnetic material particles are dispersed in a slurry-like rubber solution in which rubber is dissolved in an organic solvent, and the solution is poured onto a flat table to form a desired shape such as a plate, the solvent is volatilized to form a sheet, etc., and then vulcanized as is.

[0067] Here, we will explain a manufacturing method for a magnetic component in which magnetic bodies are arranged vertically, regardless of the number of horizontally arranged magnetic bodies, using an example in which the elastomer sheets are made of rubber (not shown). For example, when two magnetic bodies are arranged vertically in two layers, three unvulcanized elastomer sheets made of the same material as the elastomer protective members and two magnetic bodies are prepared. In a mold, the magnetic bodies are placed on the first elastomer sheet, covered with a second elastomer sheet, and then placed on the second elastomer sheet, covered with a third elastomer sheet, with the two magnetic bodies alternately sandwiched between the three elastomer sheets. The mold is then closed to vulcanize the rubber, and the magnetic bodies are arranged vertically and fixed in place within the elastomer protective members. In this way, a magnetic component with vertically arranged magnetic bodies is completed.

[0068] Furthermore, the magnetic part 5 shown in Figures 13 to 15 has a shape similar to or approximately the same as the shape of the magnetic body 3, but the shape of the magnetic part may be different from the shape of the magnetic body by partially changing the thickness of the elastomer protective member or by chamfering, etc.

[0069] Furthermore, the magnetic material component is not limited to a configuration in which only a portion of the magnetic material is covered with an elastomer protective member. However, taking as an example a flat magnetic material 31 arranged on one side of the coil as shown in Figure 19, the magnetic material component can be configured as magnetic material component 54 (Figure 19(a)) in which the magnetic material 31 is stacked between two elastomer protective members 44 of the same shape as the magnetic material 31 in a planar view, with the side surface 312 of the magnetic material 31 exposed; magnetic material component 55 (Figure 19(b)) in which the magnetic material 31 is stacked on one elastomer protective member 45, with the top surface 311 and side surface 312 of the magnetic material 31 exposed; or magnetic material component 56 (Figure 19(c)) in which one side of a rectangular parallelepiped magnetic material 36, in this case only the top surface 361, is embedded in one elastomer protective member 46 and exposed.

[0070] Furthermore, when the magnetic component is configured to include multiple magnetic bodies, the entire surfaces of all of the magnetic bodies may be covered with an elastomeric protective member, or some of the magnetic bodies may be partially covered with an elastomeric protective member and some of the magnetic bodies may be entirely covered with an elastomeric protective member, or all of the magnetic bodies may be partially covered with an elastomeric protective member.

[0071] When multiple magnetic bodies are arranged horizontally or vertically, the magnetic component is configured such that an elastomer protective member is interposed between adjacent magnetic bodies, but it may also be configured such that no protective member is interposed.Even if no protective member is interposed between adjacent magnetic bodies, it is also possible to configure such that all magnetic bodies are covered with the protective member and no magnetic bodies are exposed on the surface of the magnetic component.

[0072] Although not shown, the magnetic component may also be equipped with a heat sink. The heat sink is a member for providing heat dissipation to the magnetic component and can be constructed using a powdered or / and granular thermally conductive material. Suitable thermally conductive materials include ceramic solid materials with a thermal conductivity [W / (m·K)] of two digits or more, such as alumina, magnesium oxide, and aluminum nitride. On the other hand, metals and alloys are electrically conductive and allow current to flow easily, so they are not used as heat sinks in the present invention.

[0073] The heat sink is dispersed inside and / or on the surface of the elastomer protective member. When the elastomer protective member is made of rubber, it is preferable to mix 50 to 200 parts by weight of the heat sink with 100 parts by weight of the rubber. If the amount mixed is less than this, the thermal conductivity is insufficient, and if the amount mixed is greater than this, the flexibility of the elastomer protective member deteriorates. Furthermore, to achieve a good balance between thermal conductivity and flexibility, it is more preferable to mix 75 to 200 parts by weight of the heat sink with 100 parts by weight of the rubber of the elastomer protective member.

[0074] The heat sink may also be constructed using a known thermally conductive sheet formed in a sheet shape. The sheet-shaped heat sink may be installed inside or on the surface of the magnetic sheet, but from the viewpoint of heat dissipation, it is preferable to install it on the surface of the magnetic component.

[0075] Furthermore, a flame-retardant substance may be incorporated into the elastomer protective member to impart flame retardancy to the magnetic component. Examples of flame-retardant substances that can be used include halogen-based compounds such as tetrabromobisphenol A (TBBPA), phosphorus-based compounds such as triphenyl phosphate, and antimony-based compounds such as antimony trioxide. Metals and alloys such as metal foils and platings are conductive and allow current to flow easily, so they are excluded from the flame-retardant substance scope of the present invention. Furthermore, known substances may be blended into the magnetic component to impart heat resistance, ozone resistance, and the like.

[0076] When a magnetic part contains powdered or granular heat dissipation material, flame retardant material, heat-resistant material, or ozone-resistant material, these can be held or contained in an elastomer protective member. For example, when the elastomer protective member is made of rubber, the rubber is dissolved in an organic solvent, and particles of these materials are dispersed in a slurry-like rubber solution together with the magnetic material 3. The solution is poured onto a flat table to form a plate, and the solvent is evaporated to form a sheet, which is then vulcanized. Alternatively, particles of these materials can be kneaded into unvulcanized rubber to form an elastomer sheet, which is then vulcanized. The magnetic part can be manufactured using this elastomer sheet, as described above.

[0077] As another embodiment of the magnetic component, in the case where only a portion of the magnetic body is covered with an elastomer protective member, taking as an example a flat magnetic body 31 arranged on one side of the coil, as shown in Figure 20(a), a magnetic body component 57 may be configured such that an adhesive 7 is laminated between an elastomer protective member 48 and the magnetic body 31, and the elastomer protective member 48 and the magnetic body 31 are bonded together with the adhesive 7. Alternatively, as shown in Figure 20(b), a magnetic body component 58 may be configured such that the magnetic body 31 is fixed onto the elastomer protective member 48, a portion of the magnetic body 31 is covered with the elastomer protective member 48, and the portion of the magnetic body 31 not covered with the elastomer protective member 48 is partially or entirely covered with the adhesive 7. 20(c), the magnetic part 59 may be configured such that adhesive 7 is layered between the elastomer protective member 48 and the magnetic body 31, the elastomer protective member 48 and the magnetic body 31 are bonded together with adhesive 7, a portion of the magnetic body 31 is covered with the elastomer protective member 48, and the portion of the magnetic body 31 not covered with the elastomer protective member 48 is partially or entirely covered with adhesive 7. This configuration allows the elastomer protective member and the magnetic body to be more securely fixed. Furthermore, adhesive 7 also serves to prevent oxidation of the magnetic body and corrosion of metals by chlorine-based gases. Adhesive 7 may be made of a flexible synthetic resin.

[0078] Furthermore, although not shown, an adhesive layer made of a pressure sensitive adhesive or adhesive may be provided on the lower or upper surface of the magnetic component, so that the magnetic component can be adhered to other magnetic components, and the coil component can be adhered to electronic devices or electronic components.

[0079] Although not shown, the magnetic component may be configured to have a base fabric inside or on part or all of the surface of the magnetic component to improve its strength. The base fabric may be woven, knitted, or nonwoven, and may be made of natural fibers such as cotton, linen, or silk, or synthetic fibers such as polyester, rayon, or nylon. Carbon fiber, glass fiber, and silica fiber are excluded from the base fabric materials in order to ensure the desired flexibility of the sheet.

[0080] Next, a wireless power transmitter, a wireless power receiver, and a wireless power feed system each including a coil component for wireless power feed as a wireless power feed component will be described. As shown in Fig. 21 , the wireless power feed system 100 includes a wireless power transmitter 110 and a wireless power receiver 120.

[0081] The wireless power transmitter 110 includes a power transmitting side coil unit 111 and a power transmitting unit 112. The power transmitting side coil unit 111 includes a coil component 114 for wireless power supply of the present invention, which includes a power transmitting side coil 113, and a power transmitting side resonant circuit 115. The power transmitting unit 112 includes an AC / DC converter 116 and an inverter 117. The AC / DC converter 116 is connected to an external power supply 91 and is also connected to the inverter 117. The inverter 117 is connected to the power transmitting side resonant circuit 115, and the power transmitting side resonant circuit 115 is connected to the power transmitting side coil 113.

[0082] The wireless power receiving device 120 includes a power receiving side coil unit 121 and a power receiving unit 122. The power receiving side coil unit 121 includes a coil component 124 for wireless power transfer of the present invention, which includes a power receiving side coil 123, and a power receiving side resonant circuit 125. The power receiving unit 122 includes a rectifier circuit 126. The rectifier circuit 126 is connected to an external load 92 and is also connected to the power receiving side resonant circuit 125. The power receiving side resonant circuit 125 is connected to the power receiving side coil 123. The load is, for example, a battery, a motor, or other electrically controlled device.

[0083] The AC / DC converter 116 converts the AC voltage supplied from the power supply 91 into a DC voltage and supplies it to the inverter 117. The inverter 117 converts the DC voltage into an AC voltage and supplies it to the power transmitting side resonant circuit 115. The power transmitting side resonant circuit 115 resonates the AC voltage and supplies it to the power transmitting side coil 113. The power transmitting side coil 113 generates an AC magnetic field and transmits power to the wireless power receiving device 120. That is, the power receiving side coil 123 receives power from the power transmitting side coil 113 and supplies the AC voltage to the power receiving side resonant circuit 125. The power receiving side resonant circuit 125 supplies the AC voltage to the rectifier circuit 126. The rectifier circuit 126 rectifies the AC voltage, converts it into a DC voltage, and supplies it to the load 92.

[0084] Although not shown, the wireless power transmitting device 110 and / or the wireless power receiving device 120 includes a control circuit that controls wireless power feeding between the wireless power transmitting device 110 and the wireless power receiving device 120. The wireless power transmitting device 110 and / or the wireless power receiving device 120 also includes impedance conversion circuits such as a matching circuit, a power factor compensation circuit, and a harmonic processing circuit, and performs impedance conversion.

[0085] Alternatively, instead of the above configuration, the wireless power transmitter may be configured without a power transmitter-side resonant circuit, and the wireless power receiver may be configured without a power receiver-side resonant circuit. Furthermore, the wireless power feeding system may be configured without a power transmitter-side resonant circuit in the wireless power transmitter and without a power receiver-side resonant circuit in the wireless power receiver.

[0086] As described above, the configuration of the coil component for wireless power supply of the wireless power transmitting device and the configuration of the coil component for wireless power supply of the wireless power receiving device may both be the coil component for wireless power supply of the present invention, but at least one of them may be the coil component for wireless power supply of the present invention.

[0087] The wireless power supply system, wireless power transmitter, and wireless power receiver of the present invention can be used for, but are not limited to, home appliances, electronic devices, transportation equipment, wireless communication devices, toys, etc. Specifically, but not limited to, they can be used to charge smartphones, electric vehicles, wristwatches, electric shavers, etc. [Example]

[0088] The coil components for wireless power transfer shown in Tables 1 to 3 were manufactured, and the self-inductance (the larger the better), which is the magnitude of the magnetic flux generated from the coil at a constant current, the Q value (the larger the better), which is the efficiency with which the coil generates a magnetic field, and the mutual inductance (the larger the better), which is a coefficient related to the induced electromotive force transmitted from the transmitting coil to the receiving coil, were measured.

[0089] Examples 1-1 to 1-4 are coil components for wireless power supply in which a magnetic material is arranged exposed on one side of the coil and in the air-core portion; Example 1-5 is a coil component for wireless power supply in which a magnetic material is arranged exposed on one side of the coil and in the air-core portion; Example 1-6 is a coil component for wireless power supply in which a magnetic material is arranged exposed on one side of the coil and in the air-core portion; Examples 1-7 and 1-8 are coil components for wireless power supply in which a magnetic material covered with an elastomer protective member is arranged on one side of the coil and in the air-core portion; Example 1-9 is a coil component for wireless power supply in which a magnetic material covered with an elastomer protective member is arranged on one side of the coil and in the air-core portion; and Example 1-10 is a coil component for wireless power supply in which a magnetic material covered with an elastomer protective member is arranged on one side of the coil and in the air-core portion; Comparative Example 1-1 is a coil component for wireless power supply in which a bare magnetic material is arranged only on one side of the coil, Comparative Example 1-2 is a coil component for wireless power supply in which a magnetic material covered with an elastomer protective member is arranged only on one side of the coil, Examples 1-11 and 1-12 are coil components for wireless power supply in which granular magnetic material covered with an elastomer protective member is arranged on one side of the coil and in the air core, and Comparative Example 1-3 is a coil component for wireless power supply in which granular magnetic material covered with an elastomer protective member is arranged only on one side of the coil.

[0090] As shown in Figure 18, the magnetic parts of Examples 1-7 to 1-10 and Comparative Example 2-1 were manufactured by preparing two elastomer sheets 40 made of the same material as the elastomer protective member 4, which were unvulcanized rubber sheets, and one plate-shaped magnetic body 31, Mn-Zn ferrite PC95 (manufactured by TDK Corporation) (Figure 18(a)).The magnetic body 31 was placed on one of the elastomer sheets 40 in a mold 91 (Figure 18(b)).The other elastomer sheet 40 was placed on top of the magnetic body 31, and the magnetic body 31 was sandwiched between the two elastomer sheets 40 (Figure 18(c)).Mold 92 was then fitted to mold 91, and mold 92 was closed to vulcanize the rubber, and the magnetic body 31 was fixed in a state where it was sealed within the elastomer protective member 4 (Figure 18(d)).This produced a magnetic part 5 equipped with a magnetic body 3. Furthermore, magnetic parts in which the magnetic material 3 is in the form of a plurality of powders and / or particles were manufactured by the above method, using ferrite with a particle size of 1 to 1.9 mm instead of the plate-shaped magnetic material.

[0091] The mutual inductance is measured and calculated as follows: (Measurement procedure and calculation formula) First, the self-inductance, which is the magnitude of the magnetic flux generated from the coil at a constant current, and the Q value (the larger the better) were measured for each of the power transmitting coil and power receiving coil alone. Next, the power transmitting coil and power receiving coil were placed opposite each other, and the inductance value was measured when the power transmitting coil and power receiving coil were connected in series. The inductance for the same phase connection is La, and the inductance for the opposite phase connection is Lb. The mutual inductance M was then calculated using the following formula. M=(La-Lb) / 4

[0092] The measurement conditions are as follows: Distance between the power transmitting coil and the power receiving coil: 10 mm Measuring device: IM3570 (manufactured by Hioki E.E. Corporation) Measurement frequency: 85kHz Coil used: Outer diameter: 53.5 mm, inner diameter: 20 mm, thickness: 4.5 mm, Q value: 100 (Wurth Electronics) Ferrite: PC95 (manufactured by TDK Corporation) (Mn-Zn system (initial permeability: 3300)) Method for measuring self-inductance and Q value: The manufactured ferrite or rubber-ferrite composite was placed on an aluminum plate, and a coil was placed on top of that to measure the self-inductance and Q value. Mutual inductance measurement method: A Bakelite plate was used to separate the power transmitting coil and the power receiving coil. Ferrite or a rubber-ferrite composite was placed on one side of each of the power transmitting coil and the power receiving coil that did not face each other, and an aluminum plate was placed on the side of the power transmitting coil and the power receiving coil opposite the side on which the ferrite coil was placed. That is, for the power transmitting coil, ferrite or a rubber-ferrite composite was placed on the aluminum plate as a magnetic material, and then the coil was placed on top of that, and for the power receiving coil, the aluminum plate, magnetic material, and coil were placed from above, in the opposite order to the power transmitting coil, and measurements were taken. The coil and wiring were fixed in place to prevent movement.

[0093] The results are shown in Tables 1 to 3. The comparative examples are shown as indexes with a reference value of 100. The Q value is a measurement value for the coil alone, and is measured simultaneously with the self-inductance. The calculation formula is Q=2πfL / R. L: coil inductance, R: coil impedance, f: measurement frequency

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

[0097] As is clear from Tables 1 to 3, Examples 1-1 to 1-4 all had higher values ​​for self-inductance, Q value, and mutual inductance than Comparative Example 1-1. Example 1-5 had the same self-inductance and Q value as Comparative Example 1-1, but had a higher mutual inductance. Example 1-6 all had higher values ​​for self-inductance, Q value, and mutual inductance than Comparative Example 1-1. Examples 1-7 and 1-8 all had higher values ​​for self-inductance, Q value, and mutual inductance than Comparative Example 1-2. Example 1-9 had the same self-inductance and Q value as Comparative Example 1-2, but had a higher mutual inductance. Example 1-10 all had higher values ​​for self-inductance, Q value, and mutual inductance than Comparative Example 1-2. Examples 1-11 and 1-12 all had higher values ​​for self-inductance, Q value, and mutual inductance than Comparative Example 1-3.

[0098] Since the larger the mutual inductance, the larger the coupling coefficient k, it can be seen that by arranging a magnetic material in the air-core portion or in the air-core portion and outer portion in addition to one side of the coil, the self-inductance, Q value, mutual inductance, and coupling coefficient are all higher than in a configuration in which the magnetic material is arranged only on one side of the coil. It can also be seen that by arranging a magnetic material in the outer portion in addition to one side of the coil, both the mutual inductance and the coupling coefficient are higher than in a configuration in which the magnetic material is arranged only on one side of the coil, and therefore the power supply efficiency is higher.

[0099] Furthermore, the results of Examples 1-7 to 1-10 and Comparative Example 1-2 show that even when a magnetic body covered with an elastomer protective member is placed, the same effect as when a magnetic body not covered with an elastomer protective member is placed.Furthermore, the results of Examples 1-11 to 1-12 and Comparative Example 1-3 show that even when the magnetic body covered with an elastomer protective member is in granular or powder form, the same effect as when it is in plate or other block form can be obtained. [Example]

[0100] The magnetic parts shown in Table 4 were manufactured and their impact resistance was measured. As shown in Fig. 18, the magnetic part of Example 2-1 was manufactured by preparing two elastomer sheets 40 made of the same material as the elastomer protective member 4, which were unvulcanized rubber, and one Mn-Zn ferrite PC95 (manufactured by TDK Corporation) as the plate-shaped magnetic body 3 (Fig. 18(a)). The magnetic body 3 was placed on one of the elastomer sheets 40 in a mold 91 (Fig. 18(b)). The other elastomer sheet 40 was then placed on top of the magnetic body 3, sandwiching the magnetic body 3 between the two elastomer sheets 40 (Fig. 18(c)). The mold 92 was then mated with the mold 91, and the mold 92 was closed to vulcanize the rubber. The magnetic body 3 was then fixed in a state where it was enclosed in the elastomer protective member 4 (Fig. 18(d)). This produced a magnetic part 5 including the magnetic body 3. Comparative Example 2-1 used bare plate-shaped ferrite PC95 without a protective member, and Comparative Example 2-2 used a magnetic part with a commercially available acrylic plate made of acrylic resin as a protective member. The protective members in Example 2 and Comparative Examples 2-1 and 2-2 were 1 mm thick, and the protective member completely covered a ferrite magnetic body measuring 100 mm in length, 100 mm in width, and 5 mm in thickness.

[0101] Then, the parts of Example 2-1, Comparative Example 2-1, and Comparative Example 2-2 were dropped from a height of 2 m, and the state of the magnetic body 3 after the drop was observed. If the ferrite as the magnetic body 3 did not crack, it was considered to be pass, and is indicated by ○ in Table 3, and if the ferrite cracked, it was considered to be fail, and is indicated by × in Table 3. The results are shown in Table 3.

[0102] [Table 4]

[0103] As is clear from Table 4, Example 2-1, which uses an elastomer protective member, has superior impact resistance compared to Comparison Example 2-1, which does not use a protective member, and Comparison Example 2-2, which uses an acrylic resin as a protective member. [Industrial Applicability]

[0104] The wireless power supply component of the present invention as described above can improve the self-inductance, Q value, mutual inductance, and coupling coefficient, thereby increasing power supply efficiency, and can reliably protect magnetic materials such as ferrite, which are electromagnetic wave absorbers, and prevent damage, so it can be extremely useful as a wireless power supply system, a wireless power transmitter, a wireless power receiver, and components thereof used in a wireless power supply system. [Explanation of symbols]

[0105] 10 Coil parts 100 Wireless Power Supply System 113 Power transmission coil 110 Wireless power transmission device 114 Coil parts 120 Wireless power receiving device 123 Receiving coil 124 Coil parts 2 coils 21 Coil side 22 Air core part 230 Outer part 3 Magnetic material 4 Elastomer protective member 5 Magnetic parts 7. Adhesive 9. Mold

Claims

1. A wireless power supply component characterized in that a magnetic material is disposed on one side of a coil and in an air-core portion.

2. A wireless power supply component characterized in that a magnetic body is disposed on one side and on the outer side of a coil.

3. A wireless power supply component characterized in that a magnetic material is disposed on one side of a coil, in an air-core portion, and on an outer portion.

4. 2. The wireless power supply component according to claim 1, wherein the coil and the magnetic body disposed in the air-core portion of the coil are spaced apart from each other.

5. 3. The wireless power supply component according to claim 2, wherein the coil and the magnetic body disposed on the outer side of the coil are spaced apart from each other.

6. 4. The wireless power supply component according to claim 3, wherein the coil and the magnetic material arranged in the air-core portion of the coil, and / or the coil and the magnetic material arranged in the outer portion of the coil, are spaced apart.

7. 7. The wireless power supply component according to claim 1, wherein the magnetic body is partially or entirely covered with an elastomer protective member.

8. 7. The wireless power supply component according to claim 1, wherein at least a portion of the magnetic body is covered with an elastomer protective member, and an adhesive is laminated between the magnetic body and the elastomer protective member.

9. The wireless power supply component according to any one of claims 1 to 6, characterized in that a portion of the magnetic body is covered with an elastomer protective member, and a portion or the entire portion of the magnetic body that is not covered with the elastomer protective member is covered with an adhesive.

10. 8. The wireless power supply component according to claim 7, wherein the elastomer protective member is made of rubber, a thermoplastic elastomer, or a thermosetting elastomer other than rubber.

11. 8. The wireless power supply component according to claim 7, wherein the magnetic material is in powder or / and granular form.

12. The wireless power supply component according to claim 7 , wherein the elastomer protective member includes a heat sink.

13. A wireless power transmission device comprising the wireless power supply component according to any one of claims 1 to 6.

14. A wireless power transmission device comprising the wireless power supply component according to claim 7.

15. A wireless power receiving device comprising the wireless power supply component according to any one of claims 1 to 6.

16. A wireless power receiving device comprising the wireless power supply component according to claim 7.

17. A wireless power supply system, comprising a wireless power transmitting device and / or a wireless power receiving device, the wireless power supply component according to claim 1 .

18. A wireless power supply system, comprising a wireless power transmitting device and / or a wireless power receiving device, the wireless power supply component according to claim 7.

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