KR102451092B1 - Inductor and emi filter including the same - Google Patents

Abstract

The inductor according to the embodiment has a first contact surface and a second contact surface, a first magnetic material including ferrite, a second magnetic material disposed adjacent to the first magnetic material and having a third contact surface and a fourth contact surface, and including ferrite; a first coil wound across the inside and outside of the first magnetic body, and a second coil wound across the inside and outside of the second magnetic body, the first contact surface being connected to the third contact surface, the second contact surface comprising: It may be connected to the fourth contact surface.

Description

Inductor and EMI filter comprising same

The present invention relates to an inductor and an EMI filter including the same.

An inductor is one of electronic components applied on a printed circuit board, and may be applied to a resonance circuit, a filter circuit, a power circuit, etc. due to electromagnetic characteristics.

On the other hand, the EMI (Electro Magnetic Interference) filter applied in the power board passes the signal necessary for circuit operation and removes the noise.

1 shows a block diagram in which a general power board to which an EMI filter is applied is connected to a power source and a load.

The type of noise transmitted from the power board of the EMI filter shown in FIG. 1 is largely divided into 30 MHz to 1 GHz radiated noise radiated from the power board and 150 kHz to 30 MHz conductive noise conducted through the power line. .

A transmission method of conductive noise may be divided into a differential mode and a common mode. Among these, common mode noise returns in a large loop even if it is a small amount, so it can affect distant electronic devices. Such common mode noise is also caused by impedance imbalance of the wiring system, and becomes more pronounced in a high-frequency environment.

In order to remove common mode noise, an inductor applied to the EMI filter shown in FIG. 1 generally uses a toroidal-shaped magnetic core including a Mn-Zn-based ferrite material. Since the Mn-Zn-based ferrite has high magnetic permeability at 100 kHz to 1 MHz, common mode noise can be effectively removed.

2 shows a perspective view of a typical inductor 100 .

Referring to FIG. 2 , the inductor 100 may include a magnetic core 110 and a coil 120 wound on the magnetic core 110 .

The magnetic core 110 may have a toroidal shape, and the coil 120 includes a first coil 122 wound on the magnetic core 110 and a second coil wound to face the first coil 122 . A coil 124 may be included. Each of the first coil 122 and the second coil 124 may be wound on the upper surface S1 , the side surface S2 , and the lower surface S3 of the toroidal-shaped magnetic core 110 .

The magnetic core 110 may further include a bobbin (not shown) for insulating the coil 120 , and the coil 120 may be formed of a conductive wire whose surface is coated with an insulating material.

FIG. 3 is an exploded perspective view illustrating a case in which the magnetic core illustrated in FIG. 2 further includes a bobbin, and FIGS. 4 ( a ) and 4 ( b ) are perspective views illustrating a process of the magnetic core illustrated in FIG. 3 .

Referring to FIG. 3 , the magnetic core 110 may be accommodated in the bobbin 130 . The bobbin 130 may include an upper bobbin 132 and a lower bobbin 134 .

Next, referring to FIG. 4A , as shown in FIG. 3 , the magnetic core 110 is disposed on the bottom surface of the lower bobbin 132 in a state where the upper bobbin 132 , the magnetic core 110 and the lower bobbin 132 are provided. ) can be placed. Thereafter, the upper bobbin 131 may be coupled to the result shown in FIG. 4(a) as shown in FIG. 4(b). In this case, each component may be adhered to each other through an adhesive material.

However, since such a ferrite core has a generally closed curved planar shape, such as a toroidal shape, one end of the winding wire must be formed around the inner peripheral surface of the magnetic core 110 or the bobbin 130 (that is, hollow) in the thickness direction. (For example, in the x-axis direction), the number of windings should be penetrated. Accordingly, the winding speed and efficiency of the magnetic core 110 having a planar shape in the form of a polygonal or closed curve is lower than that of the magnetic core having a planar shape having an opening. In particular, in the case of a conductor having a relatively small diameter (eg, 0.3 to 0.4 mm), it may be wound after processing into a spring shape through wire bending, but in the case of a conductor having a larger diameter (eg, 1 mm or more), bending is easy. Since it is difficult to apply a method of processing into a spring shape, there is a problem in that production efficiency is greatly reduced.

An embodiment is to provide an inductor having an excellent noise removal performance and a constant inductance while increasing winding efficiency, and an EMI filter including the same.

In order to solve the above technical problems, the inductor according to an embodiment of the present invention has a first contact surface and a second contact surface, a first magnetic body including ferrite, is disposed adjacent to the first magnetic body, and a third contact surface and It has a fourth contact surface and includes a second magnetic body including ferrite, a first coil wound while crossing the inside and outside of the first magnetic body, and a second coil wound across the inside and outside of the second magnetic body, The first contact surface may be connected to the third contact surface, and the second contact surface may be connected to the fourth contact surface.

For example, the inductor may further include a first adhesive portion disposed between the first contact surface and the third contact surface and a second adhesive portion disposed between the second contact surface and the fourth contact surface.

For example, the first adhesive part and the second adhesive part may include ferrite.

For example, the first contact surface includes a first pattern, the third contact surface includes a second pattern corresponding to the first pattern, the second contact surface includes a third pattern, and the fourth contact surface corresponds to a third pattern A fourth pattern may be included.

For example, the inductor may further include a first bobbin disposed between the first magnetic body and the first coil and a second bobbin disposed between the second magnetic body and the second coil.

For example, the first bobbin and the second bobbin may be connected to each other.

For example, each of the first bobbin and the second bobbin may include a fastening part and may be contacted by the fastening part.

For example, the first magnetic material and the second magnetic material may have a toroidal shape when connected to each other.

In addition, the EMI filter according to an embodiment of the present invention includes an inductor and a capacitor. Here, the inductor has a first contact surface and a second contact surface, a first magnetic material including ferrite, a second magnetic material including ferrite, a first magnetic material, disposed adjacent to the first magnetic material and having a third contact surface and a fourth contact surface a first coil wound crossing the inside and outside of can be connected with

The inductor and the EMI filter including the same according to the embodiment have excellent inductance while winding workability is guaranteed through the divided magnetic core.

1 shows a block diagram in which a general power board to which an EMI filter is applied is connected to a power source and a load.
2 shows a perspective view of a typical inductor.
3 is an exploded perspective view illustrating a case in which the magnetic core shown in FIG. 2 further includes a bobbin.
4 (a) and 4 (b) are perspective views illustrating the process of the magnetic core shown in FIG. 3 .
5 is an exploded perspective view illustrating an example of a configuration of a magnetic core according to an embodiment of the present invention.
6 is an exploded plan view of the magnetic core 200A shown in FIG. 5 according to an embodiment.
7A and 7B are exploded plan views of a magnetic core according to another exemplary embodiment.
8A to 8D are exploded plan views of a portion “I” of FIG. 6 modified to explain the shape of the contact surface according to the embodiment.
9 shows an example of a form in which an adhesive member is additionally disposed in the coupling between magnetic bodies shown in FIG. 8D .
10 is an exploded perspective view of a magnetic core including a bobbin according to an embodiment.
11A to 11C are process perspective views of an inductor according to an embodiment.
12A to 12D are cross-sectional views illustrating an example of a magnetic pressing means according to an embodiment, and FIGS. 13A and 13B are cross-sectional views illustrating an example of a magnetic core structure using a bobbin fastening means according to the embodiment.
14 is an example of an EMI filter including an inductor according to an embodiment.

Since the present invention may have various changes and may have various embodiments, specific embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as 'first' and 'second' may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a second component may be named as a first component, and similarly, a first component may also be named as a second component without departing from the scope of the present invention. The term 'and'/'or' includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

In the description of embodiments, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or patterns. The description that it is formed on includes all those formed directly or through another layer. The criteria for the upper/above or lower/lower layers of each layer will be described with reference to the drawings. In addition, since the thickness or size of each layer (film), region, pattern or structure in the drawings may be changed for clarity and convenience of description, it may not fully reflect the actual size.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary may be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, it is interpreted in an ideal or excessively formal meaning. doesn't happen

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are given the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. In addition, although the embodiment is described using a Cartesian coordinate system, it goes without saying that it may be described using other coordinate systems. In the Cartesian coordinate system, the x-axis, the y-axis, and the z-axis shown in each figure are orthogonal to each other, but the embodiment is not limited thereto. The x-axis, the y-axis, and the z-axis may intersect each other.

In the embodiments of the present invention, in order to improve the winding workability of the magnetic core, a magnetic core using a plurality of magnetic materials forming a polygonal or closed curved planar shape when coupled to each other through a predetermined contact surface is proposed.

Hereinafter, a magnetic core using a plurality of magnetic materials will be described with reference to the accompanying drawings.

5 is an exploded perspective view showing an example of a configuration of a magnetic core according to an embodiment of the present invention, and FIG. 6 is an exploded plan view of the magnetic core 200A shown in FIG. 5 , respectively.

5 and 6 together, the magnetic core 200A according to the embodiment may include a first magnetic material 210A and a second magnetic material 220A. In this case, each of the first magnetic body 210A and the second magnetic body 210B may have a semi-cyclic planar shape. The first magnetic material 210A has a first contact surface 211A-1 and a second contact surface 211A-2, and the second magnetic material 210B has a third contact surface 211B-1 and a fourth contact surface 211B-2. ) can have

The first magnetic body 210A and the second contact surface 211A-1 face the third contact surface 211B-1, and the second contact surface 211A-2 faces the fourth contact surface 211B-2. When the magnetic material 210B is coupled, the magnetic core 200A may have a toroidal shape.

In other words, the first magnetic material 210A and the second magnetic material 210B may have a form in which the toroidal-shaped magnetic core 200A is divided along one circumferential direction (eg, the y-axis direction).

The first magnetic material 210A and the second magnetic material 210B may be formed of the same material. For example, the first magnetic material 210A and the second magnetic material 210B may include ferrite. Here, the specific magnetic permeability (μS) of the ferrite may be 2,000 H/m to 15,000 H/m, and the ferrite may be a Mn-Zn-based ferrite.

The first magnetic material 210A and the second magnetic material 210B may be manufactured by coating ferrite powder with a ceramic or polymer binder, then insulating the ferrite powder, and molding the ferrite powder at a high pressure. Alternatively, the first magnetic material 210A and the second magnetic material 210B may be manufactured by laminating a plurality of ferrite sheets formed by coating the ferrite powder with a ceramic or polymer binder and then insulating the ferrite sheet. However, the embodiment is not limited to a specific method of manufacturing the first magnetic body 210A and the second magnetic body 210B.

Of course, the magnetic core 200A may further include a bobbin (not shown). The shape and bonding process of the bobbin will be described later in more detail.

5 and 6, it has been described that the two magnetic materials 210A and 210B are combined to form a toroidal-shaped magnetic core, but this is exemplary and the embodiment is not limited by the number of magnetic materials and the shape of the magnetic core. It can be variously modified. This will be described with reference to FIGS. 7A and 7B.

7A and 7B are exploded plan views of a magnetic core according to another exemplary embodiment.

Referring to FIG. 7A , the magnetic core 200B according to another embodiment may include three magnetic materials 210C, 210D, and 210E having a toroidal shape when coupled to each other. Alternatively, referring to FIG. 7B , the magnetic core 200c may include two magnetic materials 210F and 210G having a rectangular planar shape when coupled to each other.

As described above, the magnetic core according to the embodiment may include a magnetic material having various numbers and shapes, but unless otherwise stated for convenience of description, hereinafter, the magnetic core of the form shown in FIGS. 5 and 6 will be provided. (200A) will be described as a reference.

Since the magnetic cores 200A, 200B, and 200C according to the embodiment have a form in which a plurality of divided magnetic materials are combined with each other, magnetic loss may occur depending on the coupling state when compared with a magnetic core made of a single magnetic material. In order to minimize such magnetic path loss, a method of making the contact surface as uniform as possible (ie, controlling the surface roughness) and a method of increasing the area of the contact surface between each magnetic body may be considered. In order to make the contact surface uniform, a method of using a more precise mold may be applied when each contact surface is polished before bonding or each magnetic body is formed.

In addition, in order to increase the area of the contact surface between the magnetic bodies, a pattern (or roughness) corresponding to each may be disposed on the contact surface facing each other during coupling. This will be described with reference to FIGS. 8A to 8D.

8A to 8D are exploded plan views of a portion “I” of FIG. 6 modified to explain the shape of the contact surface according to the embodiment.

Referring to the portion “I” in FIG. 6 , the two contact surfaces 211A-1 and 211B-1 facing each other are perpendicular to the coupling direction (eg, the z-axis) and have a smooth shape. In this case, the area of each contact surface is equal to the area of the cross section of each magnetic body 210A, 210B cut in an arbitrary circumferential direction.

However, when the bonding pattern is formed on each of the contact surfaces 211A-1 and 211B-1 as shown in FIGS. 8A to 8D , the contact area between the contact surfaces during bonding may be increased compared to the case of FIG. 6 . For example, in the case of FIG. 8A, although the contact area on the x-y plane is the same, the contact area on the x-z plane may be newly generated. As another example, even when the contact surface has an inclination in a direction crossing the circumferential direction as in 8b, the contact area may be increased. As another example, as shown in FIGS. 8C and 8D , the inclination of the contact surface may be changed by a plurality of times to have two or more inflection points.

Of course, the above-described embodiment is exemplary, and the embodiment is not limited thereto, and at least one protrusion disposed on one contact surface may be accommodated in a corresponding recess disposed on the other contact surface facing each other with less than a certain clearance. Any form (hereinafter, referred to as a “corresponding pattern”) may be applied to any pattern.

Meanwhile, even when the contact area is increased, an adhesive member may be disposed between the contact surfaces in order to lower the magnetic path loss at the contact surfaces between the respective magnetic bodies and to have a more robust magnetic core structure. This will be described with reference to FIG. 9 .

9 shows an example of a form in which an adhesive member is additionally disposed in the coupling between magnetic bodies shown in FIG. 8D .

Referring to FIG. 9 , the adhesive member A1 is disposed between the first contact surface 211A-1 and the second contact surface 211B-1. In this case, the adhesive member A1 may be in the form of a paste or in the form of a stretchable polymer film. In addition, the adhesive member A1 may further include a magnetic powder in addition to the adhesive material. The adhesive material may include, but is not limited to, an adhesive resin such as an acrylic resin, a silicone resin, or an epoxy resin. The magnetic powder may be dispersed between the adhesive materials, and may be the same material as the first magnetic material 210A and the second magnetic material 210B or a material having ferromagnetism to prevent loss of magnetic path. For example, the magnetic powder may include ferrite. Through the arrangement of the adhesive member A1 , the magnetic powder fills the gap between the contact surfaces while the bond between the magnetic materials is strengthened, thereby further reducing the loss of the magnetic path.

As mentioned above, the magnetic core may further include a bobbin. Hereinafter, the shape of the bobbin and the manufacturing process of the inductor using the magnetic core including the bobbin according to the embodiment will be described with reference to FIGS. 10 to 11C .

10 is an exploded perspective view of a magnetic core including a bobbin according to an embodiment, and FIGS. 11A to 11C are process perspective views of an inductor according to the embodiment, respectively.

First, referring to FIG. 10 , the first magnetic body 210A may be accommodated between the first upper bobbin 231A and the first lower bobbin 232A. The first upper bobbin 231A and the first lower bobbin 232A may each have a planar shape corresponding to the planar shape of the first magnetic body 210A. For example, when the first magnetic body 210A has a semi-annular planar shape having a constant central curvature, the first upper bobbin 231A and the first lower bobbin 232A also have the same central curvature as the central curvature of the first magnetic body 210A. It may have a semi-annular planar shape with Meanwhile, the second magnetic material 210B may be accommodated between the second upper bobbin 231B and the second lower bobbin 232B. The first upper bobbin 231A and the first lower bobbin 232A, except that the second upper bobbin 231B and the second lower bobbin 232B have a shape suitable for accommodating the second magnetic body 210B. Since it has similar characteristics to the bar, overlapping descriptions will be omitted for the sake of brevity of the specification.

Next, referring to FIG. 11A , the first magnetic body 210A shown in FIG. 10 is coupled to each other so as to be disposed between the first upper bobbin 231A and the first lower bobbin 232A, and the first bobbin assembly 300A. is manufactured In addition, the second magnetic body 210B shown in FIG. 10 is coupled to each other so as to be disposed between the first upper bobbin 231B and the first lower bobbin 232B, thereby manufacturing the second bobbin assembly 300B. It goes without saying that an adhesive may be used for bonding each component.

Thereafter, as shown in FIG. 11B , the first coil 240A may be wound on the first bobbin assembly 300A and the second coil 240B may be wound on the second bobbin assembly 300B, respectively. In this case, the number of windings of each coil 240A, 240B and the thickness of the conductor wire may vary depending on the desired magnetic permeability. The conductor wire constituting each coil 240A, 240B may be copper, silver, aluminum, gold, nickel, tin, or the like, and the cross section of the conducting wire may have a circular or prismatic shape, but in the embodiment, a specific material of the conductor or a specific cross-sectional shape is not limited to In addition, the surface of the conductor may be covered with an insulating material.

The winding of each of the coils 240A and 240B may be performed to cross the inner (ie, inner peripheral surface) and the outer (ie, outer peripheral surface) of each of the bobbin assemblies 300A and 300B. At this time, each bobbin assembly (300A, 300B) has a semi-circular planar shape, not a closed curve, until they are coupled to each other, so the winding workability is superior to that of a general toroidal-shaped magnetic core, and this workability is improved as the thickness of the conductor increases. The more the difference becomes more pronounced.

When the bobbin assemblies 300A and 300B in which the coil winding has been completed are coupled to each other, the inductor 400 according to the embodiment may be completed as shown in FIG. 11C .

Meanwhile, when manufacturing the inductor 400 , in order to minimize magnetic path loss due to coupling between the divided magnetic cores, the contact surfaces of the magnetic materials inside the bobbin need to be in closer contact with each other. In order to adhere the contact surfaces, a method of applying a physical external force to each magnetic body in the coupling direction may be considered. This will be described with reference to FIGS. 12A to 13B.

12A to 12D are cross-sectional views illustrating an example of a magnetic pressing means according to an embodiment, and FIGS. 13A and 13B are cross-sectional views illustrating an example of a magnetic core structure using a bobbin fastening means according to the embodiment.

Referring to FIG. 12A , the first magnetic body 210A in the first bobbin assembly 300A is coupled to the second magnetic body 210B of the second bobbin assembly 300B in the direction of an arrow (eg, - z-axis direction) is preferred. To this end, as shown in FIG. 12B , an elastic member 251A may be disposed on an inner wall of an outer circumferential surface of the first bobbin 231A+232A. The elastic member 251A may be any material as long as it has elasticity. Alternatively, the protrusion 252A having one end protruding from the inner wall of the outer circumferential surface may be integrally formed with the first bobbin as shown in FIG. 12C . When this protrusion 252A is applied, as shown in FIG. 12D , when the first magnetic body 210A is coupled to the first bobbin 231A+232A, the protrusion 252A is deformed in the direction of the arrow by the elastic force due to the deformation. can be pressurized. Accordingly, the first magnetic body 210A may be in close contact with the second magnetic body 210B when the first bobbin assembly 300A is coupled to the second bobbin assembly 300B.

On the other hand, when the above-described pressing means is applied, the first bobbin assembly 300A presses the first magnetic body 210A and the second magnetic body 210B in each of the second bobbin assemblies 300B in a direction opposite to each other. The bobbin assemblies may receive a force in a direction away from each other, and a means may be required to maintain coupling between the bobbin assemblies.

In this case, as shown in FIG. 13A , the first bobbin assembly 300A″ is provided with a fastening protrusion 261A and a fastening groove 261B in each of the second bobbin assemblies 300B″, and as shown in FIG. 13B , the inductor is coupled to each other. When forming (400 ″, coil not shown), the fastening protrusion 261A and the fastening groove 261B may be fastened to each other. Accordingly, even if the elastic members 251A and 251B press the first magnetic body 210A and the second magnetic body 210B in each coupling direction from the inside, the coupling between the bobbin assemblies 300A”, 300B” can be maintained. have.

Of course, the positions and shapes of the fastening protrusion 261A and the fastening groove 261B are exemplary, and the embodiment is not limited thereto. .

In addition, when each bobbin assembly is coupled to each other, a polymer member such as silicone may be disposed on opposite edges to reinforce impact resistance and chemical resistance, and an adhesive may be additionally used.

In addition, in the above embodiment, the winding of each coil 240A, 240B may be performed to cross the inside (ie, inner circumferential surface) and outside (ie, outer circumferential surface) of each bobbin assembly 300A, 300B, but is not limited thereto. Also, the bobbin assemblies 300A and 300B may be omitted, and the first magnetic body 210A and the second magnetic body 210B may be wound to cross the inner (ie, inner peripheral surface) and the outer (ie, outer peripheral surface) of the magnetic body 210B.

Meanwhile, the inductor according to the above-described embodiment may be included in the line filter. For example, the line filter may be a line filter for noise reduction applied to an AC-to-DC converter.

14 is an example of an EMI filter including an inductor according to an embodiment.

Referring to FIG. 14 , the EMI filter 2000 may include a plurality of X-capacitors (Cx), a plurality of Y-capacitors (Cy), and an inductor (L).

The X-capacitor (Cx) is connected between the first terminal (P1) of the live line (LIVE) and the third terminal (P3) of the neutral line (NEUTRAL) and the second terminal (P2) of the live line (LIVE) and the neutral line ( NEUTRAL), respectively, disposed between the fourth terminals P4.

The plurality of Y-capacitors Cy may be disposed in series between the second terminal P2 of the live line LIVE and the fourth terminal P4 of the neutral line NEUTRAL.

The inductor L may be disposed between the first terminal P1 and the second terminal P2 of the live line LIVE and between the third terminal P3 and the fourth terminal P4 of the neutral line NEUTRAL. have. Here, the inductor L may be the inductor 100 according to the above-described embodiment.

When common mode noise is introduced, the EMI filter 2000 removes common mode noise by using the combined impedance characteristics of a primary inductance and a Y-capacitor (Cy). Here, the primary-side inductance of the live line LIVE is to be obtained by measuring the inductance between the first and second terminals P1 and P2 while the third and fourth terminals P3 and P4 are opened. The inductance of the primary side of the neutral line NEUTRAL is obtained by measuring the inductance between the third and fourth terminals P3 and P4 while the first and second terminals P1 and P2 are open. can be

When the differential mode noise is introduced, the EMI filter 2000 removes the differential mode noise by using a combined impedance characteristic of a leakage inductance and an X-capacitor (Cx). Here, the leakage inductance of the live line LIVE can be obtained by measuring the inductance between the first and second terminals P1 and P2 while the third and fourth terminals P3 and P4 are shorted. In addition, the leakage inductance of the neutral line NEUTRAL may be obtained by measuring the inductance between the third and fourth terminals P3 and P4 while the first and second terminals P1 and P2 are short-circuited.

The inductor of the EMI filter 2000 according to the embodiment corresponds to the inductor according to the above-described embodiments.

The description of each of the above-described embodiments may be applied to other embodiments as long as content does not conflict with each other.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment may be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100, 400, 400”: Inductor
110, 200A, 200B, 200C: magnetic core
120, 240A, 240B: coil
210A: first magnetic material
210B: second magnetic material
2000: EMI filter

Claims (9)

a first magnetic material having a first contact surface and a second contact surface and including ferrite;
a second magnetic body disposed adjacent to the first magnetic body, having a third contact surface and a fourth contact surface, and including ferrite;
a first coil wound while crossing the inside and outside of the first magnetic body;
a second coil wound while crossing the inside and outside of the second magnetic body;
a first bobbin disposed between the first magnetic body and the first coil and a second bobbin disposed between the second magnetic body and the second coil;
The first elastic body is disposed between the outer peripheral surface of the first magnetic body and the inner wall of the first bobbin in a direction perpendicular to a virtual cross-section connecting the first contact surface, the second contact surface, and the centrifugal surface of the first magnetic body. absence; and
A second elasticity disposed between the outer circumferential surface of the second magnetic body and the inner wall of the second bobbin in a direction perpendicular to an imaginary cross-section connecting the third contact surface, the fourth contact surface, and the centrifugal surface of the second magnetic material. absence; including,
The first elastic member is pushed in the direction of the second magnetic body from the first magnetic body so that the first contact surface is connected to the third contact surface,
The second elastic member pushes the second magnetic body in the direction of the first magnetic body so that the second contact surface is connected to the fourth contact surface. The inductor of claim 1 , further comprising a first adhesive portion disposed between the first contact surface and the third contact surface and a second adhesive portion disposed between the second contact surface and the fourth contact surface. The inductor of claim 2 , wherein the first bonding portion and the second bonding portion include ferrite. The method of claim 1, wherein the first contact surface includes a first pattern and the third contact surface includes a second pattern corresponding to the first pattern,
The second contact surface includes a third pattern and the fourth contact surface includes a fourth pattern corresponding to the third pattern. delete The inductor of claim 1, wherein the first bobbin and the second bobbin are connected to each other. The inductor according to claim 6, wherein each of the first bobbin and the second bobbin includes a fastening portion and is contacted by the fastening portion. According to claim 1,
The first magnetic body and the second magnetic body have a toroidal shape when connected to each other, the inductor. inductor; and
including a capacitor;
The inductor is
a first magnetic material having a first contact surface and a second contact surface and including ferrite;
a second magnetic body disposed adjacent to the first magnetic body, having a third contact surface and a fourth contact surface, and including ferrite;
a first coil wound while crossing the inside and outside of the first magnetic body;
a second coil wound while crossing the inside and outside of the second magnetic body;
a first bobbin disposed between the first magnetic body and the first coil and a second bobbin disposed between the second magnetic body and the second coil;
The first elastic body is disposed between the outer peripheral surface of the first magnetic body and the inner wall of the first bobbin in a direction perpendicular to a virtual cross-section connecting the first contact surface, the second contact surface, and the centrifugal surface of the first magnetic body. absence; and
A second elasticity disposed between the outer circumferential surface of the second magnetic body and the inner wall of the second bobbin in a direction perpendicular to an imaginary cross-section connecting the third contact surface, the fourth contact surface, and the centrifugal surface of the second magnetic material. absence; including,
The first elastic member is pushed in the direction of the second magnetic body from the first magnetic body so that the first contact surface is connected to the third contact surface,
The second elastic member pushes the second magnetic body in the direction of the first magnetic body so that the second contact surface is connected to the fourth contact surface.

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