Common-mode filter

Abstract

This invention provides a common-mode filter. An exemplary embodiment of the common-mode filter is disposed in a configuration hole in a circuit board including a configuration hole of a predetermined area, comprising: a magnetic core formed into a ring shape using a magnetic material; a plurality of coils wound around the outside of the magnetic core; and a base member coupled to the magnetic core wound with the plurality of coils, and having a plurality of connecting members for electrically connecting the plurality of coils to an external source; wherein a portion of the base member is engaged with the edge side of the configuration hole.

Description

Technical Field

[0001] This invention relates to a common-mode filter. Background Technology

[0002] A common-mode filter is an electronic component mounted on a circuit board. This type of filter is applicable to various electronic devices such as communication devices and display devices, and can be used to eliminate wire noise in these devices.

[0003] Recently, there has been a demand for miniaturization and thin-film technology in various electronic devices, and therefore, there is also a demand for miniaturization and thin-film technology in common-mode filters suitable for these electronic devices.

[0004] As described above, the common-mode filter allows the signals required for circuit operation to pass through and eliminates common-mode noise.

[0005] Typically, common-mode filters are constructed by winding multiple coils separately around a toroidal magnetic core. In such common-mode filters, individual spools or housings can cover the magnetic core to electrically insulate the magnetic core from the coils and protect the magnetic core from the external environment. The coils are wound around the magnetic core covered by the spools or housings.

[0006] In addition, in common-mode filters, separate components such as splitters are arranged on the central side of the housing for electrical insulation between coils.

[0007] That is, existing common-mode filters are accompanied by a separate housing surrounding the magnetic core, which limits the overall size by adding a dimension equivalent to the thickness of the housing.

[0008] This has become a stumbling block to the miniaturization and thin-film development of common-mode filters.

[0009] In addition, existing common-mode filters are stacked on one side of the circuit board. Therefore, if the common-mode filter is placed on the circuit board, the total thickness of the common-mode filter must be increased by the thickness of the common-mode filter on the basis of the thickness of the circuit board.

[0010] This limits effective space utilization and acts as a stumbling block to achieving ultra-thinner overall thicknesses of electronic devices that utilize common-mode filters. Summary of the Invention

[0011] (The problem to be solved)

[0012] The present invention was proposed in consideration of the problems described above, and aims to provide a common-mode filter that can be made into a thin film while ensuring insulation and durability.

[0013] Another objective of the present invention is to provide a common-mode filter that can reduce the total thickness of the filter when it is mounted on a circuit board.

[0014] (Solutions)

[0015] To address the aforementioned issues, the present invention provides a common-mode filter configured in a circuit board including a configuration hole of a predetermined area, comprising: a magnetic core formed into a ring shape using a magnetic material; a plurality of coils wound around the outside of the magnetic core; and a base component coupled to the magnetic core and having a plurality of connecting components for electrically connecting the plurality of coils wound around the magnetic core to an external source; wherein a portion of the base component is engaged with the edge side of the configuration hole.

[0016] Additionally, the plurality of connecting components may be configured on the base component to serve both as terminals for electrically connecting the plurality of coils wound around the magnet core to the outside and as fastening components for securing the base component to the circuit board.

[0017] Additionally, the base component may include: a body formed in a ring shape with a hollow portion; a connecting member formed across the hollow portion in the body; and a pair of engagement grooves recessed to a predetermined depth from one side of the connecting member to embed a portion of the magnet core.

[0018] In addition, the plurality of coils include a first coil and a second coil, which are wound around the outside of the magnet core and located on the left and right sides of the connecting member. The portions of the magnet core not wound with the first coil and the second coil are respectively press-fitted into the pair of connecting grooves. The portions of the magnet core not wound with the first coil and the second coil may be the portions located between the portions wound with the first coil and the portions wound with the second coil.

[0019] In addition, when the magnet core is engaged with the base component through the pair of engagement slots, its thickness center can be aligned with the thickness center of the connecting component and engaged with the base component.

[0020] As one embodiment, the base component may further include at least two extension portions, which protrude outward from the main body by a predetermined length and form a stepped surface with one side of the main body; one side of the extension portion forming a stepped surface with one side of the main body may include a first portion extending from the main body and a second portion extending from the first portion, to form a first stepped surface and a second stepped surface having different heights respectively; the second stepped surface may be engaged with the frame of the configuration hole.

[0021] At this time, the plurality of connecting components may each include: a first protruding portion, fixed to the first portion and protruding from one side of the first portion by a predetermined length to connect the end of the coil; a second protruding portion, disposed on the outside of the second portion, spaced at a predetermined distance from the first protruding portion, and inserted into a fastening hole formed through the configuration hole on the circuit board, thereby fixing the base component to the circuit board; and a connecting portion, connecting the ends of the first protruding portion and the second protruding portion to each other.

[0022] As another example, the base component may also include at least two extensions that protrude outward from the body by a predetermined length and form a stepped surface with one side of the body. One side of the extension that forms a stepped surface with one side of the body can be engaged with the edge of the configuration hole.

[0023] At this time, the plurality of connecting components may include: a gasket portion, configured such that one side of an extension portion forming a stepped surface with one side of the body is exposed to the outside, and is fixed to one side of the circuit board by an SMD method; and a coil connecting portion, configured on the other side of the extension portion such that a portion of its length protrudes outward from the end of the extension portion to connect to the end of the coil.

[0024] Additionally, the main body and the extension may include a first configuration groove, which is recessed to a predetermined depth on one side of the main body and the extension, thereby accommodating the thickness of the coil extending from the magnet core and connected to the coil connection portion.

[0025] Additionally, the extension may include a second configuration groove formed by recessing a predetermined depth on one side of the extension, thereby accommodating the thickness of the portion of the coil connection exposed to the outside.

[0026] In addition, the magnet core may be made of metal strips of amorphous alloy or nanocrystalline alloy, and the magnet core may include an insulating coating of a predetermined thickness formed on the outside.

[0027] In addition, the magnet core can be a winding body made by winding a metal strip of amorphous alloy or nanocrystalline alloy into a ring shape.

[0028] In addition, the total thickness of the common-mode filter can be 5mm to 6mm.

[0029] (The effect of the invention)

[0030] This invention ensures insulation and durability even without the outer shell covering the magnet core, thereby reducing the overall thickness. Furthermore, it reduces the overall thickness when mounted on a circuit board, thus offering the advantage of reducing the overall thickness of electronic devices. Attached Figure Description

[0031] Figure 1 This is a diagram illustrating a common-mode filter according to an embodiment of the present invention;

[0032] Figure 2 It is looking up Figure 1 The image;

[0033] Figure 3 yes Figure 1 Exploded view;

[0034] Figure 4 yes Figure 1 A cross-sectional view along the AA direction;

[0035] Figure 5 It shows that it can be applied to Figure 1 A partial cutaway diagram of the specific structure of the magnet core;

[0036] Figure 6 This is a diagram showing the state of a common-mode filter disposed on a circuit board according to an embodiment of the present invention;

[0037] Figure 7 yes Figure 6 A cross-sectional view along the BB direction;

[0038] Figure 8 This is a diagram illustrating a common-mode filter according to another embodiment of the present invention;

[0039] Figure 9 It is looking up Figure 8 The image;

[0040] Figure 10 yes Figure 8 Exploded view;

[0041] Figure 11 yes Figure 8 A cross-sectional view along the CC direction;

[0042] Figure 12 This is a diagram illustrating the state of a common-mode filter disposed on a circuit board according to another embodiment of the present invention; and

[0043] Figure 13 yes Figure 12 A cross-sectional view along the DD direction. Detailed Implementation

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the invention. The present invention can be implemented in various different forms and is not limited to the embodiments described herein. For the purpose of clearly illustrating the invention, parts unrelated to the description are omitted in the drawings, and throughout the specification, the same or similar reference numerals are used for the same components.

[0045] like Figure 6 and Figure 12 As shown, common-mode filters 100 and 200 of an embodiment of the present invention can be disposed on circuit board 10.

[0046] At this time, a portion of the common-mode filters 100 and 200 of an embodiment of the present invention can be mounted on the circuit board 10.

[0047] That is, such as Figure 7 and Figure 13 As shown, the circuit board 10 may include a configuration hole 12 through a predetermined area, and the common mode filters 100 and 200 are disposed on the circuit board 10, thereby enabling the common mode filters 100 and 200 to be located in the area corresponding to the configuration hole 12.

[0048] Accordingly, a portion of the total thickness of the common-mode filters 100 and 200 is accommodated by the configuration hole 12, while a portion can be clipped onto the edge side of the configuration hole 12.

[0049] Therefore, if the common-mode filters 100 and 200 of an embodiment of the present invention are disposed on the circuit board 10, a portion of the total thickness of the common-mode filters 100 and 200 is accommodated by the configuration hole 12, thereby reducing the total thickness of the filters disposed on the circuit board 10.

[0050] Therefore, such as Figures 1 to 4 , Figures 8 to 11 As shown, a common-mode filter 100, 200 according to an embodiment of the present invention includes: a magnetic core 110, a plurality of coils 121, 122 and a base component 130, 230.

[0051] The magnet core 110 can be formed in a ring shape and can be made of a magnetic material.

[0052] For example, the magnet core 110 can also be a ferrite core formed by sintering or pressing ferrite powder, but as... Figure 5 As shown, the magnet core 110 can be a winding body formed by repeatedly winding a plate-shaped metal strip 112 into a loop shape.

[0053] Here, the metal strip 112 can be a heat-treated Fe alloy strip. As long as the Fe alloy is a known Fe alloy used as a magnet core, it can be used without restriction.

[0054] As a non-limiting example, the Fe-based alloy can be a ternary alloy composed of iron (Fe), silicon (Si), boron (B), and other impurities; a quaternary alloy composed of iron (Fe), boron (B), carbon (C), copper (Cu), and other impurities; a quinary alloy composed of iron (Fe), silicon (Si), boron (B), copper (Cu), niobium (Nb), and other impurities; or a quinary alloy composed of iron (Fe), boron (B), carbon (C), copper (Cu), niobium (Nb), and other impurities. Furthermore, the microstructure of the Fe-based alloy may contain amorphous or nanocrystalline grains.

[0055] At this time, as Figure 5 As shown, the magnet core 110 may include an insulating coating 114 of predetermined thickness formed on its exterior. Such an insulating coating 114 may be formed by impregnation or spraying.

[0056] Accordingly, even if the magnet core 110 is configured as a winding body in which the metal strip 112 is wound into a loop multiple times, the magnet core 110 can still be formed into a bundle through the insulating coating 114; even if the coils 121 and 122 are directly wound around the outside of the magnet core 110, the coils 121 and 122 and the magnet core 110 can still be electrically insulated from each other through the insulating coating 114.

[0057] Furthermore, even if the metal strip 112 constituting the magnet core 110 becomes more brittle after heat treatment, the magnet core 110 can still be protected from external forces by the insulating coating 114. Therefore, the common-mode filters 100 and 200 of the present invention can omit the separate outer shell or spool for wrapping the magnet core 110.

[0058] Accordingly, compared to the past, the common-mode filters 100 and 200 of one embodiment of the present invention can omit the outer shell or spool that encloses the magnet core 110, and thus can be implemented as very thin.

[0059] For example, the common-mode filters 100 and 200 may have a very thin thickness, with a total thickness or total height of 5 mm to 6 mm. However, the total thickness of the invention is not limited thereto, but may be appropriately changed according to design conditions.

[0060] Here, the insulating coating 114 may be formed using a coating composition containing an organic compound, which may be an epoxy compound, and the coating composition may also contain a curing agent that can cure the epoxy compound.

[0061] However, the insulating coating 114 is not limited to this; it can be used without restriction as long as it is insulating and can also improve durability.

[0062] The magnet core 110 described above can be attached to the base components 130 and 230 while multiple coils 121 and 122 are wound around its outer surface.

[0063] For example, the plurality of coils 121, 122 may include a first coil 121 and a second coil 122, wherein the first coil 121 and the second coil 122 are symmetrically wound around the magnet core 110, which is formed in a loop shape, without overlapping each other.

[0064] Additionally, the magnet core 110 can be attached to the base components 130 and 230 by means of the portion not wound around the first coil 121 and the second coil 122.

[0065] Furthermore, the first coil 121 and the second coil 122, which are respectively wound around the magnet core 110, can be electrically connected to a plurality of connecting parts 140 and 240 disposed on the base components 130 and 230, respectively, and the plurality of connecting parts 140 and 240 can be electrically connected to the circuit board 10.

[0066] Accordingly, the first coil 121 and the second coil 122 can receive power supply through the circuit board 10 and multiple connecting components 140, 240.

[0067] That is, the base components 130 and 230 are combined with the magnet core 110 wound around the first coil 121 and the second coil 122 to fix the magnet core 110, and may include multiple connecting components 140 and 240 for electrically connecting the first coil 121 and the second coil 122 to the circuit board 10.

[0068] Therefore, such as Figure 3 and Figure 10 As shown, the base components 130 and 230 may include: a body 131 formed in a ring shape with a hollow portion to accommodate the magnet core 110; a connecting member 132 formed across the hollow portion in the body 131; and a pair of engaging grooves 133 recessed to a predetermined depth from one side of the connecting member 132 to allow a portion of the magnet core 110 to be embedded.

[0069] In the case described above, the portion of the magnet core 110 that is not wound with the first coil 121 and the second coil 122 can be inserted into the pair of coupling slots 133.

[0070] That is, the first coil 121 and the second coil 122 can wrap around the outside of the magnet core 110 while being respectively wound around the magnet core 110 on the left and right sides of the connecting member 132.

[0071] Here, the portion of the magnet core 110 that is not wound with the first coil 121 and the second coil 122 may be the portion between the portion wound with the first coil 121 and the portion wound with the second coil 122.

[0072] Accordingly, the portion of the magnet core 110 that is not wound with the first coil 121 and the second coil 122, located between the portion wound with the first coil 121 and the portion wound with the second coil 122, can be inserted into the pair of connecting slots 133 respectively.

[0073] Therefore, if the magnet core 110 wound around the first coil 121 and the second coil 122 is attached to the base components 130 and 230, the first coil 121 and the second coil 122 can be configured to be located on the left and right sides of the connecting component 132. In this case, the connecting component 132 can function as a separator that physically insulates the first coil 121 and the second coil 122 from each other.

[0074] At this time, the portion of the connecting member 132 that is connected to the main body 131 while forming the connecting groove 133 in the connecting member 132 can be formed to have an area that becomes relatively larger from the middle of the length of the connecting member 132 toward the main body 131.

[0075] Accordingly, the portion of the magnet core 110 that is not wound with either the first coil 121 or the second coil 122, located between the portion wound with the first coil 121 and the portion wound with the second coil 122, may have an area that increases in size from the inside to the outside.

[0076] Therefore, the ends of the first coil 121 and the second coil 122 wound around the magnet core 110 can ensure a safe distance for electrical insulation.

[0077] Here, the portion of the magnet core 110 inserted into the pair of coupling grooves 133 can also be fixed to the coupling grooves 133 by a separate adhesive, or it can be fixed to the coupling grooves 133 by an interference fit.

[0078] At this time, as Figure 4 and Figure 11 As shown, the connecting member 132 is formed to have a thickness t2 that is relatively larger than the thickness t1 of the magnet core 110, and the depth of the connecting groove 133 may be relatively larger than the thickness t1 of the magnet core 110.

[0079] Accordingly, if a portion of the magnet core 110 is inserted into the connecting groove 133, the portion of the magnet core 110 inserted into the connecting groove 133 can be completely inserted into the interior of the connecting groove 133. Moreover, when the magnet core 110 is connected to the base components 130 and 230 through the pair of connecting grooves 133, the thickness center of the magnet core 110 and the thickness center of the connecting component 132 can be located on a straight line O.

[0080] Therefore, in one embodiment of the common-mode filter 100, 200 of the present invention, the total thickness of the magnet core 110 can be fully accommodated in the connecting groove 133 formed in the base component 130, 230, thereby minimizing the total thickness.

[0081] On the other hand, as described above, a portion of the common-mode filters 100 and 200 of one embodiment of the present invention can be snapped into the frame of the configuration hole 12 formed on the circuit board 10.

[0082] That is, such as Figure 6 , Figure 7 , Figure 12 and Figure 13 As shown, in one embodiment of the present invention, the common-mode filters 100 and 200 are such that a portion of the base components 130 and 230 can be snapped onto the side of the frame of the configuration hole 12.

[0083] Accordingly, the magnet core 110 can be configured not to be stacked on one side of the circuit board 10.

[0084] In the case described above, the plurality of connecting parts 140, 240 disposed on the base parts 130, 230 can serve as terminals for electrically connecting the plurality of coils 121, 122 wound on the magnet core 110 to the circuit board 10, and as fastening parts for fastening the base parts 130, 230 to the circuit board 10.

[0085] Therefore, the base components 130 and 230 may include at least two extension portions 134 and 234, which protrude outward from the main body 131 by a predetermined length and form a stepped surface with one side of the main body 131; the at least two extension portions 134 and 234 may be fixed to the circuit board 10 by the plurality of connecting components 140 and 240.

[0086] As an example, such as Figures 1 to 4 As shown, the extension 134 that forms a stepped surface with one side of the main body 131 may include a first portion 134a extending from the main body 131 and a second portion 134b extending from the first portion 134a, wherein the first portion 134a may be formed to have a thickness relatively smaller than that of the second portion 134b.

[0087] Accordingly, Figure 2 As shown, one side of the first portion 134a and one side of the second portion 134b can form stepped surfaces with different heights. That is, one side of the first portion 134a can form a first stepped surface with one side of the main body 131 in a stepped manner, and one side of the second portion 134b can form a second stepped surface with the first stepped surface in a stepped manner.

[0088] In addition, such as Figure 3 As shown, the connecting member 140 may include: a first protruding portion 141, fixed to the first portion 134a; a second protruding portion 142, disposed on the outside of the second portion 134b, spaced apart from the first protruding portion 141 by a predetermined distance; and a connecting portion 143, connecting the ends of the first protruding portion 141 and the second protruding portion 142 to each other.

[0089] In the case described above, such as Figure 4 As shown, the first protruding portion 141 is fixed to the first portion 134a by a predetermined length protruding from one side of the first portion 134a, and the second protruding portion 142 is spaced a predetermined distance from the first protruding portion 141 and the extension portion 134a by a connecting portion 143. Furthermore, the first protruding portion 141 and the second protruding portion 142 extend a predetermined length from the connecting portion 143 in the same direction.

[0090] Accordingly, the ends of the coils 121 and 122 wound around the magnet core 110 can be connected to a first protrusion 141 that protrudes a predetermined length from one side of the first portion 134a, and the second protrusion 142 can be inserted into a fastening hole 14 formed through the circuit board 10.

[0091] As a non-restrictive example, Figures 1 to 4 As shown, the lower part of the extension 134 can be formed into a stepped surface by the lower part of the first part 134a and the lower part of the second part 134b. The lower part of the first part 134a can be a first stepped surface, and the lower part of the second part 134b can be a second stepped surface.

[0092] In the case described above, the second stepped surface below the second part 134b can contact one side of the circuit board 10, and the base component 130 can be engaged with the frame side of the configuration hole 12 via the second stepped surface.

[0093] Additionally, in the connecting member 140, the first protruding portion 141 can be fixed to the first portion 134a, and the end of the first protruding portion 141 can protrude downwards by a predetermined length below the first portion 134a, and the second protruding portion 142 can protrude downwards on the outside of the second portion 134b.

[0094] In the case described above, such as Figure 1 and Figure 3 As shown, the extension portion 134 may include a receiving groove 134d, which is recessed to a predetermined depth on the extension portion 134 to accommodate the thickness of the connecting portion 143 and prevent the connecting portion 143 from being exposed to the outside from the top of the extension portion 134.

[0095] Furthermore, the connecting component 140 can also be integrally formed with the first protruding portion 141 and the extension portion 134 by insert molding, but it can also be fixed by a separate component after the first protruding portion 141 is inserted into the extension portion 134.

[0096] That is, such as Figure 4 As shown, the first portion 134a may include a through hole 134c, which is formed through the height direction to allow the first protrusion 141 to be inserted. After the first protrusion 141 passes through the through hole 134c, it can be fixed below the first portion 134a by a separate fixing member 144.

[0097] Furthermore, the circuit board 10 may include a plurality of fastening holes 14, which are formed through the surrounding of the configuration hole 12.

[0098] Accordingly, if the common-mode filter 100 of an embodiment of the present invention is disposed on the side of the configuration hole 12 of the circuit board 10, the base component 130 can be snapped onto the side of the frame of the configuration hole 12 via the second stepped surface. Additionally, the second protrusion 142 of the connecting component 140 can be inserted into the fastening hole 14 formed on the side of the circuit board 10, and the second protrusion 142 inserted into the fastening hole 14 can be fixed to the circuit board 10 by soldering.

[0099] Therefore, in one embodiment of the present invention, the common-mode filter 100 can be clipped onto the circuit board 10 via the extension portion 134 of the base component 130, and the coils 121 and 122 wound around the magnetic core 110 can be electrically connected to the circuit board 10 via the connecting component 140.

[0100] Furthermore, the connecting component 140 can serve as both a terminal for electrical connection with the circuit board 10 and a fastening component for fixing the base component 130 to the circuit board 10.

[0101] As another example, such as Figures 8 to 11 As shown, the base component 230 may include an extension 234 that protrudes from the body 131 by a predetermined length and forms a stepped surface with one side of the body 131. A portion of the connecting component 240 may be configured to expose one side of the extension 234 forming the stepped surface to the outside.

[0102] That is, such as Figure 8 and Figure 9 As shown, the connecting member 240 may include: a gasket portion 241, formed to expose one side of the extension portion 234 forming the stepped surface to the outside; and a coil connecting portion 242, configured on the other side of the extension portion 234 such that a portion of its length protrudes outward from the end of the extension portion 234.

[0103] In the case described above, such as Figure 10 and Figure 11 As shown, the gasket portion 241 can be connected to the coil connection portion 242 via a first embedded portion 243 embedded in the extension portion 234. The connection component 240 may also include a second embedded portion 244, which is bent from the end of the gasket portion 241 to be embedded in the extension portion 234.

[0104] Accordingly, the ends of the coils 121 and 122 wound around the magnet core 110 can be connected to the coil connection portion 242 protruding outward from the end of the extension portion 234, and the pad portion 241 can directly contact one side of the circuit board 10.

[0105] As a non-restrictive example, Figures 8 to 11 As shown, the lower surface of the extension portion 234 can form a stepped surface with the lower surface of the main body 131, and the connecting component 240 can be integrated with the extension portion 234 by insert molding.

[0106] That is, the connecting member 240 can be configured to be a conductive member with a plate shape having a predetermined area, which is formed by bending it multiple times, and can be integrated with the extension portion 234 such that a portion of the total length is exposed to the outside below the extension portion 234, while a portion of the remaining length is exposed to the outside above the extension portion 234.

[0107] Accordingly, the portion of the connecting member 240 exposed to the outside below the extension portion 234 can form the aforementioned gasket portion 241, the portion exposed to the outside above the extension portion 234 can form the aforementioned coil connection portion 242, and the portion embedded in the extension portion 234 can form the aforementioned first embedded portion 243 and second embedded portion 244.

[0108] As described above, the pad portion 241 formed on the stepped surface below the extension portion 234 can directly contact one side of the circuit board 10. Accordingly, the base member 230 can be secured to the frame of the configuration hole 12 via the underside of the extension portion 234, and the pad portion 241 configured on the stepped surface below the extension portion 234 can be fixed to the circuit board 10 via SMD (Surface Mount Device) mounting.

[0109] Here, the main body 131 and the extension portion 234 may include a first configuration groove 234a, which is recessed to a predetermined depth on the main body 131 and the extension portion 234 to accommodate the thickness of the coils 121 and 122 extending from the magnet core 110 and connected to the coil connection portion 242. Additionally, the extension portion 234 may include a second configuration groove 234b, which is recessed to a predetermined depth on the extension portion 234 to accommodate the thickness of the coil connection portion 242.

[0110] The first configuration slot 234a and the second configuration slot 234b, as described above, respectively accommodate the thickness of the coils 121 and 122 and the thickness of the coil connection portion 242, thereby preventing the coils 121 and 122 and the coil connection portion 242 from being exposed to the outside from the top of the extension portion 234.

[0111] Accordingly, Figure 12 and Figure 13 As shown, if a common-mode filter 200 of an embodiment of the present invention is disposed in the configuration hole 12 of the circuit board 10, the base component 230 can be locked in the frame of the configuration hole 12 by means of a stepped surface formed on one side of the extension portion 234, and the pad portion 241 of the connecting component 240 formed on the stepped surface can be fixed to one side of the circuit board 10 by means of SMD.

[0112] Therefore, in one embodiment of the present invention, the common-mode filter 200 can be clipped onto the circuit board 10 via the extension portion 234 of the base component 230, and the coils 121 and 122 wound around the magnetic core 110 can be electrically connected to the circuit board 10 via the connecting component 240.

[0113] Accordingly, the connecting component 240 can serve as both a terminal for electrical connection with the circuit board 10 and a fastening component for fixing the base component 230 to the circuit board 10.

[0114] The above describes one embodiment of the present invention. However, the concept of the present invention is not limited to the embodiment presented in this specification. Rather, those skilled in the art who understand the concept of the present invention can easily propose other embodiments by adding, changing, deleting, or adding components within the same conceptual scope, and these are also included within the conceptual scope of the present invention.

Claims

1. A common-mode filter, configured to be located in a configuration aperture in a circuit board including a configuration aperture forming a predetermined area, comprising: The magnetic core is formed into a ring shape using magnetic material; Multiple coils are wound around the outside of the magnet core; and The base component is combined with the magnet core and has multiple connecting components for electrically connecting multiple coils wound on the magnet core to the outside. The base component includes: The main body is formed into a ring shape with a hollow section; A connecting component is formed across the hollow portion of the main body; A pair of mating grooves, recessed to a predetermined depth from one side of the connecting member, are used to embed a portion of the magnet core; and The system has at least two extension portions, which protrude outward from the main body by a predetermined length and form a stepped surface with one side of the main body. The side that forms a stepped surface with one side of the main body includes a first portion extending from the main body and a second portion extending from the first portion, to form a first stepped surface and a second stepped surface with different heights, respectively; and The second stepped surface is fitted into the edge of the configuration hole.

2. The common-mode filter according to claim 1, characterized in that, The plurality of connecting components are arranged on the base component to serve both as terminals for electrically connecting the plurality of coils wound on the magnet core to the outside and as fastening components for securing the base component to the circuit board.

3. The common-mode filter according to claim 1, characterized in that, The plurality of coils includes a first coil and a second coil. The first coil and the second coil are wound around the outside of the magnet core and are located on the left and right sides of the connecting member, respectively, around the magnet core; The portions of the magnet core that are not wound around the first and second coils are respectively interference-fitted into the pair of mating grooves. The portion of the magnet core that is not wound with the first coil and the second coil is the portion located between the portion wound with the first coil and the portion wound with the second coil.

4. The common-mode filter according to claim 1, characterized in that, The magnet core is coupled to the base component with its thickness center aligned with the thickness center of the connecting component when it is coupled to the base component via the pair of coupling grooves.

5. The common-mode filter according to claim 1, characterized in that, The plurality of connecting components each include: A first protruding portion is fixed to the first portion and protrudes from one side of the first portion by a predetermined length to connect the end of the coil; a second protruding portion is disposed on the outside of the second portion at a predetermined distance from the first protruding portion and is inserted into a fastening hole formed through the configuration hole on the circuit board to fix the base component to the circuit board; and a connecting portion connects the ends of the first protruding portion and the second protruding portion to each other.

6. The common-mode filter according to claim 1, characterized in that, The magnet core is made of amorphous alloy or nanocrystalline alloy metal strips, and the magnet core includes an insulating coating of predetermined thickness formed on the outside.

7. The common-mode filter according to claim 6, characterized in that, The magnet core is a wire wound into a ring shape by winding a metal strip of amorphous alloy or nanocrystalline alloy.

8. The common-mode filter according to claim 1, characterized in that, The total thickness of the common-mode filter is 5mm to 6mm.

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