Magnetic element

Abstract

A magnetic element according to an embodiment may comprise: a core unit including a first core and a second core disposed to face the first core in a first direction; a bobbin unit at least partially disposed in the core unit; and a coil unit including an upper coil and a lower coil disposed in the bobbin unit, wherein the upper coil and the lower coil are spaced apart from each other in the first direction.

Description

magnetic elements

[0001] The embodiment relates to a magnetic element.

[0002] The power supply of electronic devices is equipped with various magnetic coupling devices, such as transformers and line filters, and magnetic elements.

[0003] Transformers can be incorporated into electronic devices for a variety of purposes. For example, they can be used to perform the energy transfer function, transferring energy from one circuit to another. Transformers can also be used to change the voltage level, either by stepping up or stepping down. Furthermore, transformers, which feature only inductive coupling between the primary and secondary windings and thus no direct DC path, can be used to block DC and pass AC, or to provide insulation between two circuits.

[0004] For large-capacity transformers of up to 20 kW, various cooling methods are employed to dissipate the heat generated from the coils and cores. For example, air cooling using a fan can be used to dissipate heat. However, insufficient airflow into the transformer can cause problems with heat dissipation characteristics, and research is currently underway to address this issue.

[0005] The embodiment provides a magnetic element having excellent cooling performance.

[0006] The magnetic element of the embodiment comprises a core portion including a first core and a second core arranged opposite to the first core in a first direction; a bobbin portion at least partially arranged within the core portion; and a coil portion including an upper coil and a lower coil arranged in the bobbin portion, wherein the upper coil and the lower coil can be arranged to be spaced apart from each other in the first direction.

[0007] For example, each of the first and second cores may include a first body portion; a first outer leg portion protruding in the first direction from one of the opposite ends of the first body portion and extending along a second direction intersecting the first direction; a second outer leg portion protruding in the first direction from the other of the opposite ends of the first body portion and extending along the second direction; and a mid-leg portion protruding in the first direction between the first outer leg portion and the second outer leg portion and extending along the second direction.

[0008] For example, the upper coil may be disposed at least partially between each of the first and second outer legs and the middle leg of the first core, and the lower coil may be disposed at least partially between each of the first and second outer legs and the middle leg of the second core.

[0009] For example, the bobbin part may include a second body part in which the upper coil and the lower coil are spaced apart in the first direction; a first upper protrusion protruding from the upper end of the second body part in a third direction intersecting the first and second directions; and a first lower protrusion protruding from the lower end of the second body part in the third direction.

[0010] For example, the first upper protrusion may include a first-first upper protrusion disposed between the first outer foot portion and the middle foot portion of the first core; and a first-second upper protrusion disposed between the second outer foot portion and the middle foot portion of the first core and located on an opposite side of the first-first upper protrusion in the third direction.

[0011] For example, the first lower protrusion may include a first-first lower protrusion disposed between the first outer foot portion and the middle foot portion of the second core; and a first-second lower protrusion disposed between the second outer foot portion and the middle foot portion of the second core and located on an opposite side of the first-first lower protrusion in the third direction.

[0012] For example, the bobbin portion may further include a coil support portion that protrudes horizontally from the second body portion between the first upper protrusion portion and the first lower protrusion portion and supports the upper coil.

[0013] For example, the first upper protrusion and the first lower protrusion may overlap in the first direction.

[0014] For example, the second body portion may include a first through hole penetrating the second body portion in the first direction, and the midfoot portion of each of the first and second cores may be inserted and positioned in the first through hole.

[0015] For example, the first through hole may have a first length in the first direction, the mid-foot of the first core may have a second length in the first direction, the mid-foot of the second core may have a third length in the first direction, and the sum of the second length and the third length may be less than the first length.

[0016] For example, the bobbin portion includes a second through hole penetrating the second body portion in a horizontal direction, and the second through hole can overlap the space between the upper coil and the lower coil in the third direction.

[0017] For example, the length of the second through hole in the first direction may be greater than the length of the separation space in the first direction.

[0018] For example, the second body portion may include an upper region between the first upper protrusion and the second through hole; and a lower region between the second through hole and the first lower protrusion, wherein the upper coil may overlap the upper region in the third direction, and the lower coil may overlap the lower region in the third direction.

[0019] For example, the second body portion may include first and second side portions facing each other in the third direction with the first through hole therebetween; third and fourth side portions facing each other in the second direction with the first through hole therebetween and positioned between the first side portion and the second side portion, and each of the first and second side portions may have a length greater than each of the third and fourth side portions in the horizontal direction.

[0020] For example, the second through hole may include a 2-1 through hole disposed on the first and second sides, respectively; and a 2-2 through hole disposed on the third and third sides, respectively.

[0021] For example, the number of the 2-1 through holes may be greater than the number of the 2-2 through holes.

[0022] For example, the bobbin portion may further include a first lower central protrusion protruding in the first and second directions from the lower end of the third side of the second body portion; a first lower peripheral protrusion protruding in the first and second directions from one end of the first lower protrusion and disposed around the first lower central protrusion; a second lower central protrusion protruding in the first and second directions from the lower end of the fourth side of the second body portion; and a second lower peripheral protrusion protruding in the first and second directions from the other end of the first lower protrusion and disposed around the second lower central protrusion.

[0023] For example, the bottom surfaces of each of the first and second lower central protrusions and the first and second lower peripheral protrusions and the bottom surface of the first body portion of the second core may be arranged on the same horizontal plane.

[0024] For example, the thickness of each of the first and second lower central protrusions and the first and second lower peripheral protrusions in the first direction may be the same as the thickness of the first body portion of the second core in the first direction.

[0025] For example, each of the first and second lower peripheral protrusions may have a step.

[0026] For example, each of the first and second lower peripheral protrusions may include a stepped portion that is recessed in the first direction and has a third through hole.

[0027] For example, the first and second wires drawn from each end of the lower coil may be supported by the second lower peripheral protrusion, and the second lower peripheral protrusion may have a larger planar area than the first lower peripheral protrusion.

[0028] For example, the third and fourth wires drawn from each of the two ends of the upper coil may overlap the first lower peripheral protrusion in the first direction.

[0029] For example, the first body portion of the second core may be accommodated in a first space between the first lower central protrusion and the second lower central protrusion; and a second space between the first lower peripheral protrusion and the second lower peripheral protrusion.

[0030] For example, the upper coil may be a primary coil and the lower coil may be a secondary coil.

[0031] For example, the lower coil may be a primary coil and the upper coil may be a secondary coil.

[0032] For example, the distance between the upper coil and the lower coil in the first direction may be 1 mm to 2 mm.

[0033] The magnetic element according to the embodiment has excellent cooling performance and heat dissipation performance.

[0034] Figure 1 shows a perspective view of a magnetic element according to one embodiment.

[0035] Fig. 2 shows an exploded perspective view of an embodiment of the magnetic element illustrated in Fig. 1.

[0036] FIG. 3 is a perspective view showing an embodiment in which the first core is removed from the magnetic element illustrated in FIG. 1.

[0037] Fig. 4 shows a perspective view of an embodiment in which the core portion is removed from the magnetic element illustrated in Fig. 1.

[0038] FIGS. 5a to 5g respectively illustrate an upper perspective view, a lower perspective view, a front view, a rear view, a plan view, a bottom view, and a side view of an embodiment of the bobbin portion illustrated in FIG. 2.

[0039] Fig. 6 shows a cross-sectional view according to an embodiment cut along the line I-I' shown in Fig. 1.

[0040] Fig. 7 shows a perspective view of a magnetic element according to another embodiment.

[0041] Fig. 8 shows an exploded perspective view of an embodiment of the magnetic element illustrated in Fig. 7.

[0042] FIG. 9 is a perspective view of an embodiment in which the first upper core segment is removed from the magnetic element illustrated in FIG. 7.

[0043] Fig. 10 shows a perspective view of an embodiment in which the first core is removed from the magnetic element illustrated in Fig. 7.

[0044] FIG. 11 shows a perspective view of an embodiment in which the first core and the second lower core segment are removed from the magnetic element illustrated in FIG. 7.

[0045] Fig. 12 shows a perspective view of a magnetic element according to another embodiment.

[0046] Fig. 13 shows an exploded perspective view of an embodiment of the magnetic element illustrated in Fig. 12.

[0047] FIG. 14 is a perspective view of an embodiment in which the first and second upper core segments are removed from the magnetic element illustrated in FIG. 12.

[0048] Fig. 15 shows a perspective view of an embodiment in which the first core is removed from the magnetic element illustrated in Fig. 12.

[0049] Fig. 16 shows a perspective view of the magnetic element illustrated in Fig. 12 with the first core and the first lower core segment removed.

[0050] Figures 17a to 17c show a top perspective view, a plan view, and a front view, respectively, of an embodiment of the bobbin illustrated in Figure 13.

[0051] FIG. 18a shows a plan view of the right corner of the magnetic element illustrated in FIG. 12, FIG. 18b shows a plan view of the left corner of the magnetic element illustrated in FIG. 12 with the second outer upper protrusion removed, FIG. 18c shows a plan view of the combination of the coil portion and the second core, and FIG. 18d shows a plan view of another embodiment of the right corner of the magnetic element illustrated in FIG. 12.

[0052] Fig. 19a shows a plan view of a magnetic element according to another embodiment, and Fig. 19b shows an enlarged view of part 'A' of Fig. 19a.

[0053] Figures 20a and 20b show side and front views, respectively, of the magnetic element illustrated in Figure 12.

[0054] Fig. 21a shows a perspective view of the magnetic element illustrated in Fig. 12 with only the bobbin and core portions combined, and Fig. 21b shows a perspective view of the magnetic element illustrated in Fig. 21a with the first core removed.

[0055] Fig. 22 shows a perspective view of a combination according to an embodiment of the core portion illustrated in Fig. 13.

[0056] Figures 23a to 23c are plan views illustrating various outer upper protrusions of a magnetic element according to an embodiment.

[0057] Figure 24a shows a bottom perspective view of the magnetic element illustrated in Figure 23a, and Figure 24b shows a bottom perspective view of the magnetic element illustrated in Figures 19a and 23b.

[0058] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0059] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may also be referred to as a second component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0060] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0061] In the description of the embodiments, the description that each layer (film), region, pattern or structure is formed "on" or "under" the substrate, each layer (film), region, pad or pattern includes both being formed directly or through the interposition of another layer. The reference to "on" or "under" each layer is explained based on the drawings. In addition, the thickness or size of each layer (film), region, pattern or structure in the drawings may be modified for clarity and convenience of explanation, and therefore does not entirely reflect the actual size.

[0062] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0063] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0064] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing symbols, identical or corresponding components will be given the same reference numbers, and redundant descriptions thereof will be omitted.

[0065] In addition, some embodiments are described using a Cartesian coordinate system (x-axis, y-axis, z-axis). In the Cartesian coordinate system, the x-axis, the y-axis, and the z-axis shown in each drawing are orthogonal to each other, but the embodiments are not limited thereto. The x-axis, the y-axis, and the z-axis may intersect each other. Hereinafter, for convenience of description, the z-direction is referred to as a vertical direction, and the x-axis direction and the y-axis direction are each referred to as horizontal directions. In addition, the x-axis direction is referred to as a first direction, the y-axis direction is referred to as a second direction, and the z-axis direction is referred to as a third direction.

[0066] Hereinafter, a magnetic element (100A) according to one embodiment will be described in detail with reference to the attached drawings.

[0067] FIG. 1 shows a perspective view of a magnetic element (100A) according to an embodiment, FIG. 2 shows an exploded perspective view of an embodiment of the magnetic element (100A) shown in FIG. 1, FIG. 3 shows a perspective view of an embodiment in which a first core (112A) is removed from the magnetic element (100A) shown in FIG. 1, FIG. 4 shows a perspective view of an embodiment in which a core portion (110A) is removed from the magnetic element (100A) shown in FIG. 1, FIGS. 5a to 5g show an upper perspective view, a lower perspective view, a front view, a rear view, a plan view, a bottom view, and a side view, respectively, of an embodiment of a bobbin portion (120A) shown in FIG. 2, and FIG. 6 shows a cross-sectional view taken along the line I-I' shown in FIG. 1 according to an embodiment.

[0068] A magnetic element (100A) according to one embodiment may include a core portion (110A), a bobbin portion (120A), and a coil portion (130A).

[0069] The core portion (110A) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (110A) may include a first core (112A) and a second core (114A). The first core (112A) and the second core (114A) may be arranged to face each other in the first direction.

[0070] The first core (112A) may include a first body portion (B11), a first outer foot portion (OL11), a second outer foot portion (OL12), and a midfoot portion (CL1), and the second core (114A) may include a first body portion (B12), a first outer foot portion (OL21), a second outer foot portion (OL22), and a midfoot portion (CL2).

[0071] The first outer portion (OL11, OL21) may protrude in a first direction from one of the two ends of the first body portion (B11, B12) in the form of a flat plate, and may extend along a second direction intersecting the first direction.

[0072] The second outer leg (OL12, OL22) may protrude in the first direction from the other end of the first body part (B11, B12) and extend along the second direction.

[0073] The midfoot portion (CL1, CL2) may protrude in a first direction between the first outer foot portion (OL11, OL21) and the second outer foot portion (OL12, OL22) and may extend along a second direction.

[0074] The first core (112A) may be positioned above the second core (114A). The first and second cores (112A, 114A) may be symmetrical in shape or asymmetrical in shape. However, for convenience of explanation, it is assumed in the following description that they are symmetrical in shape.

[0075] When the first core (112A) and the second core (114A) are connected vertically, the first and second outer legs (OL11, OL12) and the middle leg (CL1) of the first core (112A) face the corresponding first and second outer legs (OL21, OL22) and the middle leg (CL2) of the second core (114A), respectively. At this time, a gap of a predetermined distance may be formed between at least some of the outer legs or the middle legs that face each other. In the case of Fig. 6, the predetermined distance is illustrated as '0', but the embodiment is not limited thereto. For example, the predetermined distance of the gap is 10 μm to 100 μm, but is not necessarily limited thereto. For example, the predetermined distance of the gap may be 100 μm, and may be set in various ways depending on the embodiment.

[0076] Additionally, the core portion (110A: 112A, 114A) may include a magnetic material, for example, iron or ferrite, but is not necessarily limited thereto.

[0077] Meanwhile, the bobbin part (120A) can be at least partially placed within the core part (110A).

[0078] The coil portion (130A) may include an upper coil (132) and a lower coil (134) disposed, i.e., wound, on the bobbin portion (120A). Referring to FIG. 6, the upper coil (132) may be disposed at least partially between the first and second outer portions (OL11, OL12) of the first core (112A) and the middle portion (CL1), and the lower coil (134) may be disposed at least partially between the first and second outer portions (OL21, OL22) of the second core (114A) and the middle portion (CL2).

[0079] In the case of FIG. 6, the upper coil (132) and the lower coil (134) are each illustrated as being in contact with the second body portion (B2) of the bobbin portion (120A) described later, but the embodiment is not limited thereto. That is, according to another embodiment, the upper coil (132) and the lower coil (134) may each be arranged to be spaced apart from the second body portion (B2) in a third direction. That is, the upper coil (132) and the lower coil (134) may each be arranged closer to the outer portions (OL11, OL12, OL21, OL22) than to the mid-foot portions (CL1, CL2).

[0080] According to an embodiment, the upper coil (132) and the lower coil (134) may be spaced apart from each other in the first direction. That is, as illustrated in FIG. 6, the upper coil (132) and the lower coil (134) may be spaced apart from each other with a separation space (SP) therebetween. If the distance by which the upper coil (132) and the lower coil (134) are spaced apart from each other in the first direction, that is, the width (X5) of the separation space (SP) in the first direction, is less than 1 mm, a short may occur between the upper coil (132) and the lower coil (134), and if it is greater than 2 mm, the area on which the winding wire can be wound may be reduced, making it difficult to secure a desired power capacity. Therefore, the width (X5) may be 1 mm to 2 mm, but the embodiment is not limited thereto.

[0081] In one embodiment, the upper coil (132) may be a primary coil and the lower coil (134) may be a secondary coil. Alternatively, in another embodiment, the lower coil (134) may be a primary coil and the upper coil (132) may be a secondary coil.

[0082] Each of the upper coil (132) and the lower coil (134) may include a plurality of conductive wires wound to form a plurality of turns centered around the first through hole (TH1).

[0083] Each of the upper coil (132) and the lower coil (134) may be a plurality of conductive wires (or multiple windings) made of a rigid conductive metal, for example, a copper conductive wire, wound several times in a spiral or flat spiral shape, but is not necessarily limited thereto. For example, at least one of the upper coil (132) and the lower coil (134) may be an enameled wire wrapped with fiber yarn (USTC wire), a Litz wire, a triple insulated wire (TIW: Triple Insulated Wire), or the like.

[0084] Hereinafter, the configuration of the bobbin part (120A) according to an embodiment is described as follows with reference to the attached drawing.

[0085] The bobbin part (120A) may include a second body part (B2), a first upper protrusion (UP1), and a first lower protrusion (DP1).

[0086] In the second body part (B2), the upper coil (132) and the lower coil (134) can be arranged spaced apart from each other in the first direction.

[0087] As illustrated in FIG. 5c, the first upper protrusion (UP1) can protrude not only in the second direction from the upper end (UE1, UE2) of the second body part (B2), but also in a third direction intersecting the first and second directions, respectively.

[0088] The first upper protrusion (UP1) may include first-first and first-second upper protrusions (UP11, UP12). The first-first upper protrusion (UP11) protrudes in the second and third directions from the upper end (UE1) of the second body portion (B2) and may be positioned between the first outer portion (OL11) and the mid-foot portion (CL1) of the first core (112A). The first-second upper protrusion (UP12) protrudes in the second and third directions from the upper end (UE2) of the second body portion (B2) and may be positioned between the second outer portion (OL12) and the mid-foot portion (CL1) of the first core (112A). The first-second upper protrusion (UP12) may be positioned on the opposite side of the first-first upper protrusion (UP11) in the third direction.

[0089] The first upper protrusion (UP1) arranged in this manner can not only support the first core (112A), but also prevent the upper coil (132) wound on the fifth body part (B5) from escaping upward.

[0090] The first lower protrusion (DP1) may protrude in a third direction from the lower end of the second body portion (B2). The first lower protrusion (DP1) may include the first-first and first-second lower protrusions (DP11, DP12).

[0091] The first-first lower protrusion (DP11) may be positioned between the first outer portion (OL21) and the middle portion (CL2) of the second core (114A), and the first-second lower protrusion (DP12) may be positioned between the second outer portion (OL22) and the middle portion (CL2) of the second core (114A). The first-second lower protrusion (DP12) may be positioned on the opposite side of the first-first lower protrusion (DP11) in the third direction.

[0092] The first lower protrusion (DP1) arranged in this manner can not only support the lower coil (134), but also prevent the lower coil (134) wound on the fifth body part (B5) from falling downward.

[0093] According to an embodiment, the first upper protrusion (UP1) and the first lower protrusion (DP1) may overlap in the first direction to form a space in which the upper coil (132) and the lower coil (134) are accommodated.

[0094] In addition, the bobbin part (120A) may further include a coil support part (122). The coil support part (122) protrudes horizontally from the second body part (B2) between the first upper protrusion part (UP1) and the first lower protrusion part (DP1) and serves to support the upper coil (132).

[0095] In one embodiment, as illustrated, the coil support (122) may be placed at a corner of the second body portion (B2).

[0096] In another embodiment, referring to FIG. 5c, the coil support (122) may be placed in an area (122K) directly above the second-second through hole (TH22) instead of at the corner of the second body portion (B2).

[0097] In addition, as illustrated, the coil support (122) may be positioned above the second through hole (TH22), but may also be positioned to horizontally overlap the second through hole (TH22), or may be positioned below the second through hole (TH22). For example, unlike as illustrated in FIG. 5D, the coil support (122) and the second through hole (TH22) may be positioned on an imaginary horizontal line (HL). However, as long as the upper coil (132) can be supported, the embodiment is not limited to a specific position and shape in which the coil support (122) is positioned.

[0098] In addition, the bobbin portion (120A) may further include a first through hole (TH1). The first through hole (TH1) penetrates the second body portion (B2) in the first direction, and the mid-foot portions (CL1, CL2) of each of the first core (112A) and the second core (114A) may be inserted and arranged in the first through hole (TH1).

[0099] Referring to FIG. 5g, the first through hole (TH1) may have a first length (X1) in the first direction, and referring to FIG. 2, the midfoot (CL1) of the first core (112A) may have a second length (X2) in the first direction, and the midfoot (CL2) of the second core (114A) may have a third length (X3) in the first direction.

[0100] In one embodiment, as illustrated in FIG. 6, the sum of the second length (X2) and the third length (X3) may be equal to the first length (X1).

[0101] In another embodiment, the sum of the second length (X2) and the third length (X3) may be less than the first length (X1).

[0102] In addition, the bobbin portion (120A) may further include a second through hole (TH2: TH21, TH22). The second through hole (TH2) may penetrate the second body portion (B2) in a second or third direction. For example, the second through hole (TH2) may include a second-first through hole (TH21) penetrating the second body portion (B2) in a third direction and a second-second through hole (TH22) penetrating the second body portion (B2) in a second direction.

[0103] According to an embodiment, the second through hole (TH2) may overlap the space (SP) between the upper coil (132) and the lower coil (134) illustrated in FIG. 6 in the second or third direction. For this purpose, the position of the coil support (122) may be determined.

[0104] According to an embodiment, the length (X4) of the second through hole (TH2) in the first direction may be greater than the length (X5) of the separation space (SP) in the first direction. Accordingly, at least one of the upper coil (132) or the lower coil (134) may overlap the second through hole (TH2) in the second or third direction. For example, the length (X4) may be 1 mm to 5 mm, but the embodiment is not limited thereto.

[0105] Also, referring to FIG. 5g, the second body portion (B2) may include an upper region (UA) and a lower region (LA). The upper region (UA) may be defined as a region positioned between the first upper protrusion (UP1: UP11, UP12) and the second through hole (TH2), and the lower region (LA) may be defined as a region positioned between the second through hole (TH2) and the first lower protrusion (DP11, DP12).

[0106] The upper coil (132) can overlap with the upper region (UA) in the third direction, and the lower coil (134) can overlap with the lower region (LA) in the third direction.

[0107] Meanwhile, the second body part (B2) may further include first to fourth side parts (S1 to S4).

[0108] The first and second sides (S1, S2) face each other in the third direction with the first through hole (TH1) therebetween, and the third and fourth sides (S3, S4) face each other in the second direction with the first through hole (TH1) therebetween, and can be positioned between the first side (S1) and the second side (S2).

[0109] The second through hole (TH2) may include a second-first through hole (TH21) disposed on the first and second sides (S1, S2) respectively and penetrating the second body part (B2) in the third direction, and a second-second through hole (TH22) disposed on the third and fourth sides (S3, S4) respectively and penetrating the second body part (B2) in the second direction.

[0110] The second-first through-hole (TH21) and the second-second through-hole (TH22) may have the same size or number, but the embodiment is not limited to a specific size or number of the second through-hole (TH2: TH21, TH22).

[0111] As illustrated, in the horizontal direction, each of the first and second sides (S1, S2) has a longer length than each of the third and fourth sides (S3, S4). Therefore, when the sizes of the 2-1 and 2-2 through holes (TH21, TH22) are the same, the number of the 2-1 through holes (TH21) arranged in the first and second sides (S1, S2) may be greater than the number of the 2-2 through holes (TH22) arranged in the third and fourth sides (S3, S4) respectively. For example, as illustrated, the number of the 2-1 through holes (TH21) may be four and the number of the 2-2 through holes (TH22) may be two, but the embodiment is not limited thereto.

[0112] In another embodiment, the number of the 2-1 through holes (TH21) and the 2-2 through holes (TH22) is the same, and the size of the 2-1 through hole (TH21) may be larger than the size of the 2-2 through hole (TH22).

[0113] Additionally, the bobbin portion (120A) may include first and second lower central protrusions (LCP1, LCP2), a first lower peripheral protrusion (LPP11, LPP12), and a second lower peripheral protrusion (LPP21, LPP22).

[0114] The first lower central protrusion (LCP1) protrudes in the first and second directions from the lower end of the third side (S3) of the second body part (B2), and the second lower central protrusion (LCP2) protrudes in the first and second directions from the lower end of the fourth side (S4) of the second body part (B2). The first and second lower central protrusions (LCP1, LCP2) serve to support the lower coil (134), as illustrated in FIGS. 1, 3, and 4.

[0115] The first lower peripheral protrusions (LPP11, LPP12) protrude in the first and second directions from one end of the first lower protrusions (DP11, DP12) and are disposed on the periphery of the first lower central protrusion (LCP1). That is, the first-first lower peripheral protrusion (LPP11) protrudes in the first and second directions from one end of the first-first lower protrusion (DP11) and is disposed on one side of the periphery of the first lower central protrusion (LCP1), and the first-second lower peripheral protrusion (LPP12) protrudes in the first and second directions from one end of the first-second lower protrusion (DP12) and is disposed on the other side of the periphery of the first lower central protrusion (LCP1).

[0116] The second lower peripheral protrusions (LPP21, LPP22) protrude in the first and second directions from the other ends of the first lower protrusions (DP11, DP12) and are disposed on the periphery of the second lower central protrusion (LCP2). That is, the 2-1 lower peripheral protrusion (LPP21) protrudes in the first and second directions from the other end of the 1-1 lower protrusion (DP11) and is disposed on one side of the periphery of the second lower central protrusion (LCP2), and the 2-2 lower peripheral protrusion (LPP22) protrudes in the first and second directions from the other end of the 1-2 lower protrusion (DP12) and is disposed on the other side of the periphery of the second lower central protrusion (LCP2).

[0117] Referring to FIGS. 5c and 5d, the bottom surface (BSC1) of the first lower central protrusion (LCP1), the bottom surface (BSC2) of the second lower central protrusion (LCP2), the bottom surface (BSP11) of the first-first lower peripheral protrusion (LPP11), the bottom surface (BSP12) of the first-second lower peripheral protrusion (LPP12), the bottom surface (BSP21) of the second-first lower peripheral protrusion (LPP21), and the bottom surface (BSP22) of the second-second lower peripheral protrusion (LPP22) and the bottom surface (114BS) of the first body portion (B12) of the second core (114A) can be arranged on the same horizontal plane.

[0118] In addition, the thickness (T1) of each of the first lower central protrusion (LCP1) and the first lower peripheral protrusion (LPP11, LPP12) in the first direction, the thickness (T2) of each of the second lower central protrusion (LCP2) and the second lower peripheral protrusion (LPP21, LPP22) in the first direction, and the thickness (T3) of the first body portion (B12) of the second core (114A) in the first direction may be equal to each other.

[0119] Accordingly, the first body portion (B12) of the second core (114A) can be accommodated in the first space between the first lower central protrusion (LCP1) and the second lower central protrusion (LCP2) facing in the second direction, and in the second space between the first lower peripheral protrusions (LPP11, LPP12) and the second lower peripheral protrusions (LPP21, LPP22) facing in the second direction.

[0120] In addition, according to the embodiment, each of the first lower peripheral protrusions (LPP11, LPP12) and the second lower peripheral protrusions (LPP21, LPP22) has a step. At this time, each of the first lower peripheral protrusions (LPP11, LPP12) and the second lower peripheral protrusions (LPP21, LPP22) may include a step portion (STP1 to STP4) that is recessed in the first direction and has a third through hole (TH3).

[0121] Although not shown, the magnetic element (100A) according to the embodiment may be connected to a printed circuit board (PCCB: Printed Circuit Board). At this time, the third through hole (TH3) of the magnetic element (100A) may be a location where a screw (not shown) for fastening the magnetic element (100A) to the PCB is inserted. At this time, the first and second lower central protrusions (LCP1, LCP2) described above may play a role in preventing bending of the magnetic element (100A) when the screw is fastened. To this end, the first and second lower central protrusions (LCP1, LCP2) and the first lower peripheral protrusions (LPP11, LPP12) and the second lower peripheral protrusions (LPP21, LPP22) may be formed integrally.

[0122] According to an embodiment, as shown in FIGS. 5c and 5d, the width in the third direction below the upper portion of the bobbin portion (120A) may be greater than that above.

[0123] Referring to FIGS. 3 and 4, the first and second wires (W1, W2) drawn from each of the two ends of the lower coil (134) are supported by the second lower peripheral protrusions (LPP21, LPP22). On the other hand, the third and fourth wires (W3, W4) drawn from each of the two ends of the upper coil (132) overlap with the first lower peripheral protrusions (LPP11, LPP12) in the first direction, but are not supported by the first lower peripheral protrusions (LPP11, LPP12).

[0124] At this time, a plurality of terminal pins (or connection ends) (TM1 to TM4) may be arranged at the ends of each of the first to fourth wires (W1 to W4). The plurality of terminal pins may be connected to a power supply device and components.

[0125] In order for the second lower peripheral protrusions (LPP21, LPP2) to stably support the first and second wires (W1, W2), the second lower peripheral protrusions (LPP21, LPP22) may have a larger planar area than the first lower peripheral protrusions (LPP11, LPP12). That is, referring to FIG. 5f, the planar area (SA11) of the first-first lower peripheral protrusion (LPP11), the planar area (SA12) of the first-second lower peripheral protrusion (LPP12), the planar area (SA21) of the second-first lower peripheral protrusion (LPP21), and the planar area (SA22) of the second-second lower peripheral protrusion (LPP22) are as shown in the following mathematical expression 1.

[0126]

[0127] Here, Y1 represents the length of the first lower peripheral protrusion (LPP11, LPP12) in the second direction, Y2 represents the length of the second lower peripheral protrusion (LPP21, LPP22) in the second direction, Z11 represents the length of the first-first lower peripheral protrusion (LPP11) in the third direction, Z12 represents the length of the first-second lower peripheral protrusion (LPP12) in the third direction, Z21 represents the length of the second-first lower peripheral protrusion (LPP21) in the third direction, and Z22 represents the length of the second-second lower peripheral protrusion (LPP22) in the third direction.

[0128] These plane areas (SA11, SA12, SA21, SA22) can have a relationship as shown in the following mathematical expression 2.

[0129]

[0130] Hereinafter, a magnetic element (100B) according to another embodiment will be described with reference to the attached drawings.

[0131] FIG. 7 shows a perspective view of a combined magnetic element (100B) according to another embodiment, FIG. 8 shows an exploded perspective view of an embodiment of the magnetic element (100B) shown in FIG. 7, FIG. 9 shows a perspective view of an embodiment in which the first upper core segment (112B1) is removed from the magnetic element (100B) shown in FIG. 7, FIG. 10 shows a perspective view of an embodiment in which the first core (112B) is removed from the magnetic element (100B) shown in FIG. 7, and FIG. 11 shows a perspective view of an embodiment in which the first core (112B) and the second lower core segment (114B1) are removed from the magnetic element (100B) shown in FIG. 7.

[0132] Unlike the magnetic element (100A) according to the embodiment, the magnetic element (100B) according to another embodiment has a configuration in which at least one of the first and second cores (112B, 114B) is divided in the second direction. In this way, except that the shape of the core portion (110B) is different from the shape of the core portion (110A), the description of the magnetic element (100A) according to the embodiment described above can be applied to the magnetic element (100B) according to the other embodiment illustrated in FIGS. 7 to 11, and therefore, the same reference numerals are used for the same parts, and redundant descriptions are omitted.

[0133] According to another embodiment, the magnetic element (100B) may be composed of a core portion (110B), a bobbin portion (120B), and a coil portion (130A).

[0134] The core portion (110B) may include first and second cores (112B, 114B).

[0135] The first core (112B) may include a plurality of upper core segments divided in the second direction, and the second core (114B) may include a plurality of upper core segments and a plurality of lower core segments each arranged opposite to each other in the first direction.

[0136] For example, as illustrated, each of the first core (112B) and the second core (114B) may be divided into two, but the embodiment is not limited thereto, and may be divided into three or more segments. In the illustrated case, the first core (112B) may be divided into first and second upper core segments (112B1, 112B2), and the second core (114B) may be divided into first and second lower core segments (114B1, 114B2).

[0137] Hereinafter, the first core (112B) and the second core (114B) are described as being divided into two, but the following description may also be applied to a case where the first core (112B) and the second core (114B) are divided into three or more, as described below.

[0138] The first core (112B) may include first and second upper core segments (112B1, 112B2). Each of the first and second upper core segments (112B1, 112B2) may include a first body portion (B11), a first outer foot portion (OL111), a second outer foot portion (OL112), and a midfoot portion (CL11).

[0139] The second core (114B) may include first and second lower core segments (114B1, 114B2). Each of the first and second lower core segments (114B1, 114B2) may include a first body portion (B12), a first outer foot portion (OL221), a second outer foot portion (OL222), and a midfoot portion (CL22).

[0140] The first outer leg portion (OL111, OL221) may protrude in a first direction from one of the ends of the first body portion (B11, B12) and extend in a second direction. The second outer leg portion (OL112, OL222) may protrude in a first direction from the other of the ends of the first body portion (B11, B12) and extend in a second direction. The midfoot portion (CL11, CL22) may protrude in a first direction between the first outer leg portion (OL111, OL221) and the second outer leg portion (OL112, OL222) and extend in a second direction.

[0141] Meanwhile, the bobbin part (120B) may include a second body part (B2), a first upper protrusion (UP1), and a first lower protrusion (DP1).

[0142] The coil portion (130A) may be arranged in the second body portion (B2) and may include an upper coil (132) and a lower coil (134) wound on the second body portion (B2) and spaced apart from each other in the first direction. The upper coil (132) may be one of the primary coil and the secondary coil, and the lower coil (134) may be the other of the primary coil and the secondary coil.

[0143] Alternatively, unlike the coil portion (130A) of the magnetic element (100A) according to one embodiment, the primary coil and the secondary coil may be arranged in the bobbin portion (120B) without being spaced apart from each other in the first direction, and in the case of the magnetic element (100B) according to another embodiment, the primary coil and the secondary coil are not limited to a specific shape in which they are arranged.

[0144] The first upper protrusion (UP1) may include a first-first upper protrusion (UP11) and a first-second upper protrusion (UP12).

[0145] The first-first upper protrusion (UP11) is positioned between the first outer foot portion (OL111) and the midfoot portion (CL11) of each of the first and second upper core segments (112B1, 112B2), and the first-second upper protrusion (UP12) is positioned between the second outer foot portion (OL112) and the midfoot portion (CL11) of each of the first and second upper core segments (112B1, 112B2), and may be positioned on the opposite side of the first-first upper protrusion (UP11) in the third direction. In this way, the first-first and first-second upper protrusions (UP11, UP12) serve to support the plurality of upper core segments (112B1, 112B2).

[0146] The first lower protrusion (DP1) may include first-first and first-second lower protrusions (DP11, DP12). The first-first lower protrusion (DP11) is positioned between the first outer foot portion (OL221) and the midfoot portion (CL22) of each of the first and second lower core segments (114B1, 114B2), and the first-second lower protrusion (DP12) is positioned between the second outer foot portion (OL222) and the midfoot portion (CL22) of each of the first and second lower core segments (114B1, 114B2), and may be positioned on the opposite side of the first-first lower protrusion (DP11) in the third direction.

[0147] In addition, the midfoot portions (CL11, CL22) of the first and second upper core segments (112B1, 112B2) and the first and second lower core segments (114B1, 114B2) can be inserted and arranged in the first through hole (TH1) of the second body portion (B2) illustrated in FIGS. 5a to 5g, and the description of the sizes of the midfoot portions (CL1, CL2) and the first through hole (TH1) described above can also be applied to the midfoot portions (CL11, CL22), and redundant descriptions are omitted.

[0148] In addition, the bobbin part (120B) of the magnetic element (100B) is the same as the bobbin part (120A) of the magnetic element (100A) according to one embodiment, so redundant descriptions are omitted, and only the different parts are described.

[0149] Unlike the magnetic element (100A) according to one embodiment, in the magnetic element (100B) according to another embodiment, the first and second cores (112A, 114B) are divided in the second direction, so that the plurality of divided upper core segments and the plurality of divided lower core segments can be maintained spaced apart at regular intervals.

[0150] To this end, according to an embodiment, the magnetic element (100B) may further include first and second adhesive portions (AD1, AD2, AD3, AD4).

[0151] The first and second adhesive portions (AD1, AD2) adhere the bottom surface (BS1) of the first body portion (B11) of each of the first and second upper core segments (112A, 112B) and the upper surface (TSF) of the first upper protrusion (UP1), so that the first and second upper core segments (112B1, 112B2) are maintained at a constant distance from each other.

[0152] The third and fourth adhesive portions (AD3, AD4) adhere the upper surface (BS2) of the first body portion (B12) of each of the first and second lower core segments (114A, 114B) to the lower surface (ST3) of the first lower protrusion (DP1) as shown in FIG. 5f, so that the first and second lower core segments (114B1, 114B2) are maintained at a constant distance from each other.

[0153] According to another embodiment, since the first and second cores (112A, 114B) in the magnetic element (100B) are divided in the second direction, in order to maintain the plurality of divided upper core segments and the plurality of lower core segments spaced apart at a constant interval, according to the embodiment, the magnetic element (100B) may include first to fourth stoppers (or spacing maintainers) (ST1, ST2, ST3, ST4).

[0154] The first and second stoppers (ST1, ST2) are arranged between the first body portions (B11) of the first and second upper core segments (112B1, 112B2) on the upper surface of the first upper protrusion (UP1: UP11, UP12), and serve to maintain the first and second upper core segments (112B1, 112B2) spaced apart from each other at a constant interval.

[0155] The second and fourth stoppers (ST3, ST4) are arranged between the first body portions (B12) of the first and second lower core segments (114B1, 114B2) on the lower surface of the first lower protrusion (DP1: DP11, DP12), and serve to maintain the first and second lower core segments (114B1, 114B2) spaced apart from each other at a constant interval.

[0156] According to an embodiment, as shown, the magnetic element (100B) may include both the first and second adhesive portions (AD1 to AD4) and the first and second stoppers (ST1 to ST4), or may include only the first and second adhesive portions (AD1 to AD4) or only the first and second stoppers (ST1 to ST4).

[0157] According to an embodiment, a plurality of upper core segments (112B1, 112B2) may be arranged to be spaced apart from each other in the second direction by a first gap (GS1), and a plurality of lower core segments (114B1, 114B2) may be arranged to be spaced apart from each other in the second direction by a second gap (GS2).

[0158] According to an embodiment, the widths of the first gap (GS1) and the second gap (GS2) in the horizontal direction may be the same. For example, if the width of each of the first gap (GS1) and the second gap (GS2) in the second direction is less than 0.1 mm, the inlet through which air flows into the inside of the magnetic element (100B) from the outside becomes narrow, making it difficult to cool the heat inside the magnetic element (100B) by the outside air. If it is greater than 1.0 mm, the first gap (GS1) and the second gap (GS2) may generate fringing flux, which may increase the flow of magnetic flux and affect heat generation. Therefore, the width of each of the first gap (GS1) and the second gap (GS2) in the second direction may be 0.1 mm to 1.0 mm, but the embodiment is not limited thereto.

[0159] In the case of the magnetic element (100A) according to the above-described embodiment, by separating the primary coil and the secondary coil in the first direction, a path through which air can flow is formed between the primary coil and the secondary coil, so that the heat generated in the coil can be effectively cooled, thereby improving the heat generation characteristics, i.e., cooling performance.

[0160] In addition, by arranging the space (SP) between the primary coil and the secondary coil and the plurality of second through holes (TH2) to overlap each other in the third direction, air introduced into the second through holes (TH2) can easily be introduced into the space (SP), thereby forming a path for fan cooling, thereby further improving cooling performance.

[0161] In addition, since the first body part (B12) of the second core (114A, 114B) is accommodated in the first space between the first lower central protrusion (LCP1) and the second lower central protrusion (LCP2) and the second space between the first lower peripheral protrusions (LPP11, LPP12) and the second lower peripheral protrusions (LPP21, LPP22), a separate space for accommodating the second core (114A, 114B) is not required, and thus the size of the magnetic element (100A, 100B) can be reduced and miniaturized.

[0162] In addition, if each of the first and second cores (112A, 114A) is not divided but is formed as one piece, the amount of air flowing into the magnetic element (100A) may not be sufficient. However, in the case of the magnetic element (100B) according to another embodiment, each of the first and second cores (112B, 114B) is divided in the second direction and is spaced apart from each other with a gap (GS1, GS2) therebetween, so that a sufficient amount of air flows into the inside of the magnetic element (100B) from the outside through the gap (GS1, GS2) to cool the heat, thereby further improving the cooling performance. This superiority of the cooling performance becomes more prominent as the magnetic element (100B) becomes larger.

[0163] Hereinafter, a magnetic element (100C) according to another embodiment is described as follows with reference to the attached drawing.

[0164] FIG. 12 is a perspective view showing a combined magnetic element (100C) according to another embodiment, FIG. 13 is an exploded perspective view showing an embodiment of the magnetic element (100C) shown in FIG. 12, FIG. 14 is a perspective view showing an embodiment of the magnetic element (100C) shown in FIG. 12 with the first and second upper core segments (112C1, 112C2) removed, FIG. 15 is a perspective view showing an embodiment of the magnetic element (100C) shown in FIG. 12 with the first core (112C) removed, FIG. 16 is a perspective view showing the magnetic element (100C) shown in FIG. 12 with the first core (112C) and the first lower core segment (114C1) removed, and FIGS. 17a to 17c are upper perspective views showing an embodiment of the bobbin (120C) shown in FIG. 13, The floor plan and front view are shown respectively.

[0165] Fig. 6 also corresponds to a cross-sectional view according to an embodiment cut along line Ⅱ-Ⅱ' shown in Fig. 12.

[0166] A magnetic element (100C) according to another embodiment, unlike the magnetic element (100A) according to one embodiment, has a configuration in which at least one of the first and second cores (112C, 114C) is divided in the second direction.

[0167] In addition, in the case of the magnetic element (100B) according to another embodiment, the first and second cores (112B, 114B) have a configuration in which they are divided into two in the second direction, whereas in the case of the magnetic element (100C) according to another embodiment, the first and second cores (112C, 114C) have a configuration in which they are divided into three in the second direction.

[0168] In addition, the magnetic element (100C) according to another embodiment has a shape of a spacer (USTL, USTR, LSTR, LSTL) arranged on a bobbin (120C) that is different from the shape and position of the spacer (ST1, ST2, ST3, ST4) of the magnetic element (100B) according to another embodiment.

[0169] Additionally, the magnetic element (100C) according to another embodiment does not include a coil support (122) unlike the magnetic elements (100B, 100C) according to one embodiment and the other embodiment.

[0170] Additionally, the second upper protrusion (UP2) of the magnetic element (100C) according to another embodiment has a different shape from the first upper protrusion (UP1) of the magnetic element (100A, 100B) according to one embodiment and another embodiment.

[0171] As described above, the magnetic element (100C) according to another embodiment has various different characteristics from the magnetic elements (100A, 100B) according to one embodiment and other embodiments. Therefore, for the magnetic element (100C), the same reference numerals are used for the same parts as those of the magnetic elements (100A, 100B), redundant descriptions are omitted, and only the different parts are described. That is, the parts whose description is omitted for the magnetic element (100C) can be applied to the description of the magnetic elements (100A, 100B) according to the above-described embodiment.

[0172] According to another embodiment, the magnetic element (100C) may be composed of a core portion (110C), a bobbin portion (120C), and a coil portion (130B).

[0173] The core portion (110C) may include first and second cores (112C, 114C).

[0174] The first core (112C) may include a plurality of upper core segments divided in the second direction, and the second core (114C) may include a plurality of upper core segments and a plurality of lower core segments each arranged opposite to each other in the first direction.

[0175] For example, as illustrated, each of the first core (112C) and the second core (114C) may be divided into three parts, but the embodiment is not limited thereto and may be divided into four or more parts. In the illustrated case, the first core (112C) may be divided into first to third upper core segments (112C1, 112C2, 112C3), and the second core (114C) may be divided into first to third lower core segments (114C1, 114C2, 114C3).

[0176] Hereinafter, the first core (112C) and the second core (114C) are described as being divided into three parts, but the following description may also be applied to a case where the first core (112C) and the second core (114C) are divided into four or more parts.

[0177] Each of the first to third upper core segments (112C1, 112C2, 112C3) may include a third body portion (B3), a first outer foot portion (OL311), a second outer foot portion (OL312), and a midfoot portion (CL31).

[0178] Each of the first to third lower core segments (114C1, 114C2, 114C3) may include a fourth body portion (B4), a first outer foot portion (OL321), a second outer foot portion (OL322), and a midfoot portion (CL32).

[0179] The first outer leg (OL311) may protrude in a first direction from one of the two ends of the third body (B3) and extend along a second direction, and the first outer leg (OL321) may protrude in a first direction from one of the two ends of the fourth body (B4) and extend along a second direction.

[0180] The second outer leg portion (OL312) may protrude in a first direction from the other end of the third body portion (B3) and extend in a second direction, and the second outer leg portion (OL322) may protrude in a first direction from the other end of the fourth body portion (B4) and extend in a second direction. The midfoot portions (CL31, CL32) may protrude in a first direction between the first outer leg portions (OL311, OL321) and the second outer leg portions (OL312, OL322) and extend in a second direction.

[0181] Meanwhile, the bobbin part (120C) may include a fifth body part (B2), a second upper protrusion (UP2), and a first lower protrusion (DP1).

[0182] Except that the shape and position of the second-first and second-second through holes (TH21, TH22) included in the fifth body part (B5) are different from those of the second body part (B2) according to the above-described embodiment, the fifth body part (B5) is the same as the second body part (B2), and therefore, a redundant description is omitted. The shape and position of these second-first and second-second through holes (TH21, TH22) are described later. In addition, the first lower protrusion (DP1) is the same as the first lower protrusion (DP1) of the magnetic element (100A, 100B) described above, and therefore, a redundant description is omitted by using the same reference numeral.

[0183] Unlike the aforementioned embodiments (100A, 100B), the bobbin portion (120C) may not include a coil support portion (122). To this end, the upper coil (132) may be firmly wound on the bobbin portion (120C) so as not to fall in the direction of gravity.

[0184] The second upper protrusion (UP2) may protrude in the second and third directions from the upper end of the fifth body portion (B5). Referring to FIG. 17b, the second upper protrusion (UP2) may include a second-first upper protrusion (UP21) and a second-second upper protrusion (UP22). Each of the second-first upper protrusion (UP21) and the second-second upper protrusion (UP22) may include first and second outer upper protrusions (OUP1, OUP2) and an inner upper protrusion (IUP).

[0185] In each of the 2-1 upper protrusion (UP21) and the 2-2 upper protrusion (UP22), the first and second outer upper protrusions (OUP1, OUP2) correspond to a portion disposed outside the core portion (110C), and the inner upper protrusion (IUP) corresponds to a portion disposed inside the core portion (110C).

[0186] The second-first upper protrusion (UP21) protrudes in at least one of the second or third directions from the upper end of the fifth body portion (B5) (e.g., UE1 as shown in FIG. 17c). The second-first upper protrusion (UP21) is positioned between the first outer foot portion (OL311) and the middle foot portion (CL31) of each of the first to third upper core segments (112C1, 112C2, 112C3).

[0187] The second-second upper protrusion (UP22) protrudes in at least one of the second or third directions from the upper end of the fifth body portion (B5) (e.g., UE2 as shown in FIG. 17c). The second-second upper protrusion (UP22) is positioned between the second outer foot portion (OL312) and the middle foot portion (CL31) of each of the first and second upper core segments (112C1, 112C2, 112C3), and may be positioned on the opposite side of the second-first upper protrusion (UP21) in the third direction. In this way, the second-first and second-second upper protrusions (UP21, UP22) serve to support the plurality of upper core segments (112C1, 112C2, 112C3).

[0188] Except for the different shapes of the first and second outer upper protrusions (OUP1, OUP2) and the different arrangement of the spacers (USTR, USTL, LSTR, LSTL), the second-first upper protrusion (UP21) and the second-second upper protrusion (UP22) are identical to the first-first upper protrusion (UP11) and the first-second upper protrusion (UP12), respectively, and therefore, the description of the overlapping portions will be omitted, and only the different portions will be described in detail.

[0189] For example, if the first and second thicknesses (TK1, TK2) in the first direction of the second-1 and second-2 upper protrusions (UP21, UP22) are each less than 1 mm, there is a possibility of breakage. Therefore, the first and second thicknesses (TK1, TK2) may each be 1 mm or more, but the embodiment is not limited thereto.

[0190] Additionally, the width (L2) in the third direction of the 2-1 upper protrusion (UP21) and the width (L1) in the third direction of the 2-2 upper protrusion (UP22) may be the same.

[0191] The first through hole (TH1) of the fifth body portion (B5) may have a width (L3) in the third direction. That is, the width (L3) may correspond to the shortest distance in the third direction between the second-first upper protrusion (UP21) and the second-second upper protrusion (UP22). For example, the width (L3) may be greater than the width (L1 or L2), but the embodiment is not limited thereto.

[0192] Additionally, the width in the third direction of the first-first lower protrusion (DP11) and the width in the third direction of the first-second lower protrusion (DP12) may be the same.

[0193] Fig. 18a shows a plan view according to an embodiment of the right corner of the magnetic element (100C) illustrated in Fig. 12, Fig. 18b shows a plan view of the left corner of the magnetic element (100C) illustrated in Fig. 12 with the second outer upper protrusion (OUP2) removed, Fig. 18c shows a plan view of the combination of the coil portion (130B) and the second core (114C), and Fig. 18d shows a plan view according to another embodiment of the right corner of the magnetic element (100C) illustrated in Fig. 12. In Fig. 18b, the outer upper protrusion (CV4) is treated with a dotted line to help understand the arrangement relationship with the upper coil (132).

[0194] The first and second outer upper protrusions (OUP1, OUP2) protrude in a second direction intersecting the first direction from the inner upper protrusion (IUP) and are located outside the core portion (110C). The inner upper protrusion (IUP) protrudes in a third direction from the fifth body portion (B5) and is located inside the core portion (110C).

[0195] Referring to FIG. 17b, each of the first outer upper protrusion (OUP1) (hereinafter referred to as 'CV1') of the 2-1 upper protrusion (UP21) and the first outer upper protrusion (OUP1) (hereinafter referred to as 'CV2') of the 2-2 upper protrusion (UP22) may have a fan-shaped plane shape with a central angle of 90°.

[0196] In addition, the second outer upper protrusion (OUP2) (hereinafter referred to as 'CV3') of the 2-1 upper protrusion (UP21) and the second outer upper protrusion (OUP2) (hereinafter referred to as 'CV4') of the 2-2 upper protrusion (UP22) may each have a fan-shaped plane shape with a central angle of 90°.

[0197] Each of the outer upper protrusions (CV1 to CV4) may include first and second portions (P1, P2). For example, referring to FIG. 18B, the first portion (P1) of the outer upper protrusion (CV4) corresponds to a portion that overlaps the coil portion (130B) in the first direction, and the second portion (P2) corresponds to a portion that extends horizontally from the first portion (P1).

[0198] It is preferable that the second portion (P2) protrude as little as possible from the first portion (P1). For example, when the coil portion (130B) includes a plurality of coils (CO1, CO2, CO3, CO4), the second portion (P2) may extend by a distance (d1) that is more than half the diameter (Φ) of the outermost coil (CO4) included in the coil portion (130B). This is because, if the size (d) of the second portion (P2) is smaller than half the diameter (Φ), the upper coil (132) may escape when the coil portion (130B) is wound around the bobbin portion (120C).

[0199] The coil portion (130B) may include an upper coil (132) and a lower coil (134) arranged in the bobbin portion (120B). The description of the coil portion (130A) illustrated in FIG. 6 described above can be applied to the coil portion (130B) of the magnetic element (100C) according to another embodiment, and thus, a duplicate description is omitted. That is, although the illustration of the first to fourth wires (W1, W2, W3, W4) described in the embodiments (100A, 100B) in the magnetic element (100C) according to another embodiment is omitted, the wires (W1 to W4) may also be connected to the coil (130B) of the magnetic element (100C) as in the embodiments (100A, 100B) described above.

[0200] The outermost coil (e.g., CO4) of the coil section (130B) and the outermost outer upper protrusions (CV1, CV2, CV3, CV4) have the same plane shape, i.e., a rounded plane shape.

[0201] Referring to FIG. 18c, the coil portion (130B) may include an inner portion (CIP) positioned inside the core portion (110C) and outer portions (COP1, COP2) positioned outside the core portion (110C). That is, the portion of the coil portion (130B) positioned inside the core portion (110C) is defined as the inner portion (CIP), and the portion positioned outside the core portion (110C) is defined as the outer portion (COP1, COP2).

[0202] Each of the outer parts (COP1, COP2) may include a central part (CCP) and a peripheral part (CPP1, CPP2).

[0203] The first and second outer upper protrusions (OUP1, OUP2) are positioned over the outer portions (COP1, COP2), and the inner upper protrusion (IUP) is positioned over the inner portion (CIP).

[0204] According to one embodiment, the central portion (CCP) may correspond to a portion having a rectangular plane shape in the outer portions (COP1, COP2), and the peripheral portions (CPP1, CPP2) may correspond to a portion of the outer portions (COP1, COP2) excluding the central portion (CCP) and disposed around the central portion (CCP).

[0205] In another embodiment, the central portion (CCP) may correspond to a portion overlapping in the second direction with the midfoot portion (e.g., CL32: CL321, CL322, CL323 shown in FIG. 18c) of the core portion (110C) (e.g., the second core (114C) shown in FIG. 18c) in the outer portions (COP1, COP2), and the peripheral portions (CPP1, CPP2) may correspond to a portion of the outer portions (COP1, COP2) excluding the central portion (CCP).

[0206] The peripheral portions (CPP1, CPP2) have a fan-shaped plane shape with a central angle of 90° and can be arranged around the central portion (CCP). At this time, the outer upper protrusions (CV1, CV2, CV3, CV4) can be arranged above the peripheral portions (CPP1, CPP2).

[0207] Each of the outer upper protrusions (CV1, CV2, CV3, CV4) may include first, second and third faces (SP1, SP2, SP3).

[0208] As illustrated in Fig. 18a, the first surface (SP1) is a surface adjacent to the central portion (CCP) and can overlap in a first direction the boundaries (BD11, BD12, BD21, BD22) of the central portion (CCP) and the peripheral portions (CCP1, CCP2) illustrated in Fig. 18c. The second surface (SP2) can overlap in a first direction the boundaries (BD2) of the inner portion (CIP) and the peripheral portions (CPP1, CPP2). The third surface (SP3) is arranged between the first surface (SP1) and the second surface (SP2). According to an embodiment, the third surface (SP3) has a curved planar shape.

[0209] In another embodiment, the first surface (SP1) of each of the outer upper protrusions (CV1, CV2, CV3, CV4) may be spaced apart from the boundaries (BD11, BD12, BD21, BD22) by a predetermined distance in a third direction toward the outside of the magnetic element (100C). That is, the first surface (SP1) may be spaced apart from the central portion (CCP) by a predetermined distance in the third direction. For example, as illustrated in FIG. 18d, the outer upper protrusion (CV1) may be spaced apart from the boundary (BD11) by a first predetermined distance (PY1) in the +z-axis direction, the outer upper protrusion (CV2) may be spaced apart from the boundary (BD12) by a second predetermined distance in the -z-axis direction, the outer upper protrusion (CV3) may be spaced apart from the boundary (BD21) by a third predetermined distance in the +z-axis direction, and the outer upper protrusion (CV4) may be spaced apart from the boundary (BD22) by a fourth predetermined distance in the -z-axis direction.

[0210] On a plane, the first and second predetermined distances may be determined so that more than 50% of the outer portion (COP1) can be exposed without being covered by the outer upper protrusions (CV1, CV2). In addition, on a plane, the third and fourth predetermined distances may be determined so that more than 50% of the outer portion (COP2) can be exposed without being covered by the outer upper protrusions (CV3, CV4). As a result, a large portion of the coil portion (130B) is exposed to the flow path through which air for cooling the magnetic element (100C) flows, so that the heat dissipation performance of the magnetic element (100C) can be improved.

[0211] Fig. 19a shows a plan view of a magnetic element (100D) according to another embodiment, and Fig. 19b shows an enlarged view of part 'A' of Fig. 19a.

[0212] Except for the difference in the planar shape of the outer upper protrusions (CV5 to CV8), the magnetic element (100D) according to another embodiment is the same as the magnetic element (100C) according to another embodiment described above, and therefore, the same reference numerals are used for the same parts, and redundant descriptions are omitted.

[0213] The outer upper protrusions (CV5 to CV8) perform the same function as the outer upper protrusions (CV1 to CV4), respectively. The first and second upper core segments (112C1, 112C2) are spaced apart in the second direction by a constant distance (YG3), and the second and third upper core segments (112C2, 112C3) are spaced apart in the second direction by a constant distance (YG4), and the distances (YG3, YG4) may be the same or may be different in some cases.

[0214] Although the outer upper protrusion (CV8) is described with reference to FIG. 19b, the description of the outer upper protrusion (CV8) can also be applied to other outer upper protrusions (CV5, CV6, CV7).

[0215] First, the outer upper protrusion (CV8) may have a planar shape that does not deviate from the outermost coil (CO1) among the plurality of coils (132: CO1, CO2, CO3, CO4) in the second direction.

[0216] The outer upper projection (CV8) may include fourth, fifth and sixth surfaces (SP4, SP5, SP6).

[0217] The fourth surface (SP4) is a portion close to the center portion (CCP) of the coil portion (130B), the fifth surface (SP5) is a portion that is chamfered (or chamfered) as the outermost surface in the third direction from the outer upper protrusion (CV8), and the sixth surface (SP6) is a surface between the fourth surface (SP4) and the fifth surface (SP5), and corresponds to the outermost surface of the outer upper protrusion (CV8) in the second direction.

[0218] According to an embodiment, the fifth surface (SP5) may be arranged to cover more than 50% of the diameter of the outermost coil (CO1) and may not protrude further than the outermost side of the core portion (110C) in the third direction (i.e., the -z-axis direction). In addition, the sixth surface (SP6) may be arranged so as not to go beyond the outer line of the outermost coil (CO1) in the second direction for a desirable air flow.

[0219] In addition, similar to the aforementioned outer upper protrusion (CV4), the fourth side (SP4) of the outer upper protrusion (CV8) may also be spaced apart from the boundary (BD22) in the third direction by a predetermined distance (PY2). At this time, the predetermined distance (PY2) may be determined so that, on a plane, more than 50% of the outer portion (COP2) is exposed without being covered by the outer upper protrusions (CV7, CV8).

[0220] Meanwhile, the magnetic element (100C) according to the embodiment may include a gap maintaining member (USTR, USTL, LSTR, LSTL).

[0221] Figures 20a and 20b show side and front views, respectively, of the magnetic element (100C) illustrated in Figure 12.

[0222] Referring to FIGS. 17a and 17b and 20a, the bobbin portion (100C) may further include an upper gap maintaining portion (USTR, USTL) and a lower gap maintaining portion (LSTR, LSTL).

[0223] The upper spacing member (USTR, USTL) protrudes in the third direction from the inner upper protrusion (IUP) between the plurality of upper core segments (112C1, 112C2, 112C3) so as to maintain a constant spacing between the plurality of upper core segments (112C1, 112C2, 112C3).

[0224] The lower spacing member (LSTR, LSTL) protrudes between the plurality of lower core segments (114C1, 114C2, 114C3) in the third direction from the first lower protrusion (DP1: DP11, DP12), thereby allowing the plurality of lower core segments (114C1, 114C2, 114C3) to maintain a constant spacing.

[0225] The number of each upper spacer (USTR, USTRL) may be one less than the number of the plurality of upper core segments (112C1, 112C2, 112C3), and the number of each lower spacer (LSTR, LSTRL) may be one less than the number of the plurality of lower core segments (114C1, 114C2, 114C3).

[0226] The gap-maintaining portions (ST1, ST2, ST3) of the magnetic element (100B) according to the other embodiment described above may protrude in the first direction, whereas in the magnetic element (100C) according to another embodiment, at least one of the upper gap-maintaining portions (USTR, USTL) or the lower gap-maintaining portions (LSTR, LSTL) may protrude in the third direction.

[0227] In addition, the upper spacer (USTR, USTL) and the lower spacer (LSTR, LSTL) may be arranged to overlap in the first direction. Therefore, the gap (YG1) in which the upper core segments (112C1, 112C2, 112C3) are spaced apart from each other by the upper spacer (USTR, USTL) and the gap (YG2) in which the lower core segments (114C1, 114C2, 114C3) are spaced apart from each other by the lower spacer (LSTR, LSTL) are connected, so that heat generated inside the magnetic core (100C) can be discharged through the second through hole (TH2) and then smoothly discharged to the outside through the gaps (YG1, YG2). For this purpose, the second through hole (TH2) may be connected to the gaps (YG1, YG2).

[0228] In an embodiment, referring to FIG. 15, the width (YW) in the second direction of each of the upper spacing maintenance portion (USTR, USTL) or the lower spacing maintenance portion (LSTR, LSTL) can be determined to satisfy the following mathematical expression 3.

[0229]

[0230] Here, N represents the number of segments of the first core (112C) or the second core (114C), YW represents the width of the upper spacer (USTR, USTL) or the lower spacer (LSTR, LSTL) in the second direction, and THV represents the separation distance of the plurality of upper core segments (112C1, 112C2, 112C3) or lower core segments (114C1, 114C2, 114C3) in the second direction to maintain the critical reduction amount of inductance that the magnetic element (100C) must have and to preserve the inductance at the maximum value.

[0231] For example, the width of the upper spacer (USTR, USTL) in the second direction and the width of the lower spacer (LSTR, LSTL) in the second direction may be the same. If the THV is secured to 4 mm or more for heat dissipation of the magnetic element (100C), the inductance may be reduced by 15% or more, so the THV may be determined to 4 mm, but the embodiment is not limited to a specific value of the THV.

[0232] Meanwhile, just as the second through hole (TH2) is formed in the bobbin (120A) of the magnetic element (100A, 100B) according to the above-described embodiment, the second through hole (TH2) may also be formed in the bobbin (120C) of the magnetic element (100C, 100D) according to another embodiment. Hereinafter, the description related to the second through hole (TH2) of the magnetic element (100C) may also be applied to the magnetic element (100A, 100B, 100D) according to the above-described embodiment.

[0233] Fig. 21a shows a perspective view of only the bobbin (120C) and the core portion (110C) in the magnetic element (100C) shown in Fig. 12, and Fig. 21b shows a perspective view of the magnetic element (100C) shown in Fig. 21a with the first core (112C) removed.

[0234] According to another embodiment, the bobbin (120C) may further include a second through hole (TH2) formed by penetrating the fifth body portion (B5) in a direction intersecting the first direction (e.g., in at least one of the second or third directions).

[0235] Similar to the second body portion (B2), the fifth body portion (B5) may include first to fourth side portions (S1 to S4). Referring to FIG. 17b, the first and second side portions (S1, S2) face each other in a third direction intersecting the first direction, and the third and fourth side portions (S3, S4) face each other in the second direction and may be positioned between the first and second side portions (S1, S2).

[0236] The second through hole (TH2) may include a plurality of second through holes (TH2) formed in at least one of the first to fourth sides (S1 to S4). In an embodiment, the plurality of second through holes (TH2) may be positioned on the same horizontal line.

[0237] For example, the second through hole (TH2) may include a second-first through hole (TH21) formed in the first and second sides (S1, S2) of the fifth body part (B5) and a second-second through hole (TH22) formed in the third and fourth sides (S3, S4) of the fifth body part (B5). Second through holes (TH2) having the same shape and size may be formed in the first to fourth sides (S1, S2, S3, S4) of the fifth body part (B5), or second through holes (TH2) having different shapes and sizes may be formed, and the embodiment is not limited to a specific shape and a specific size of the second through hole (TH2).

[0238] For example, the 2-1 and 2-2 through holes (TH21, TH22) have the same rectangular shape as shown, but may have different sizes.

[0239] Before describing the second through hole (TH2) in detail, the core portion (110C) illustrated in FIG. 12 will be briefly described as follows with reference to the attached drawing.

[0240] Fig. 22 shows a perspective view of a combination according to an embodiment of the core portion (110C) illustrated in Fig. 13.

[0241] As described above, the middle foot (CL31) of the first core (112C) and the middle foot (CL32) of the second core (114C) may be spaced apart in the first direction to form a gap (XG). For example, the inductance of the magnetic element (100C) may be adjusted using the size of the gap (XG). As the gap (XG) increases, the inductance may decrease. For example, the distance of the gap (XG) in the first direction is 10 μm to 100 μm, but is not necessarily limited thereto.

[0242] According to an embodiment, the size of the second through hole (TH2) may be proportional to the size of the gap (XG). This is because, as the size of the gap (XG) increases, the generated heat increases, so that the heat is quickly discharged to the outside through the second through hole (TH2).

[0243] Additionally, according to an embodiment, the length (a1 or a2) of the second through hole (TH2) in the first direction may be greater than or equal to the length of the gap (XG) in the first direction.

[0244] Additionally, according to an embodiment, the space (SP) between the upper coil (132) and the lower coil (134) illustrated in FIG. 6, FIG. 20a and FIG. 20b may be in communication with the second through hole (TH2).

[0245] In addition, the second through hole (TH2) can overlap with the gap (YG1, YG2) in the third direction so that the heat inside the magnetic element (100C) can be discharged through the second through hole (TH2), and the heat discharged through the second through hole (TH2) can be discharged well to the outside.

[0246] The bobbin part (120C) serves to secure the winding of the coil part (130B) and to insulate the coil part (130B) and the core part (110C) from each other. Considering this, the coil part (130B) may be wound while avoiding the part where the middle part (CL31, CL32) is exposed due to the second through hole (TH2). If the middle part (CL31, CL32) is exposed through the second through hole (TH2), that is, if at least a part of the middle part (CL31, CL32) overlaps the second through hole (TH2) in the horizontal direction, the upper coil (132) may be placed above the second through hole (TH2), and the lower coil (134) may be placed below the second through hole (TH2).

[0247] If the bobbin part (120C) is not placed between the coil part (130B) and the core part (110C), the magnetic element may become vulnerable to withstand voltage. Therefore, the coil part (130B) may be wound around the bobbin part (120C) so that the insulation creepage distance between the coil part (130B) and the core part (110C) satisfies 5.5 mm or more.

[0248] Additionally, the height of the second through hole (TH2) in the first direction can be determined to satisfy the following mathematical expression 4.

[0249]

[0250] Here, referring to FIG. 6 and FIG. 21a, h represents the height in the first direction of the space (SS1 or SS2) in which the coil portion (130A, 130B) is wound between the midfoot portion and the first or second outer foot portion, i represents the width in the third direction of the space (SS1 or SS2), g represents the sum of the cross-sectional areas (SA) of the coils existing in the space (SS1 or SS2), and a represents the height (a1) of the 2-1 through hole (TH21) in the first direction or the height (a2) of the 2-2 through hole (TH22) in the first direction.

[0251] In addition, in order to discharge the heat generated in the midfoot (CL31, CL32), the height (a1, a2) of the second through hole (TH2) in the first direction must be greater than the length of the gap (XG) in the first direction, i.e., the distance by which the midfoot is spaced in the first direction. However, as the height (a1, a2) of the second through hole (TH2) increases, the area in which the coil part (130B) can be wound may become narrower. Taking this into consideration, the height (a1, a2) of the second through hole (TH2) in the first direction may be 10% or more of the length of the gap (XG) in the first direction, but the embodiment is not limited thereto.

[0252] Additionally, to facilitate heat dissipation, the total area of ​​the second through holes (TH2) may be 50% or more of the area of ​​the gap (XG). That is, the size of the second through holes (TH2) may be determined by considering the following mathematical expression 5.

[0253]

[0254] Here, a represents the length (a1, a2) of the second through hole (TH2: TH21, TH22) in the first direction, b represents the width (b1, b2) of the second through hole (TH2: TH21, TH22) in the horizontal direction, n represents the total number of second through holes (TH2: TH21, TH22), c represents the length of the gap (XG) in the first direction, and d2 represents the length of the gap (XG) in the third direction.

[0255] Additionally, the total area of ​​the second through hole (TH2) can be determined to satisfy the following mathematical expression 6.

[0256]

[0257] Here, e represents the length of the fifth body part (B5) in the third direction, and f represents the length of the fifth body part (B5) in the second direction. For example, the left part of mathematical expression 6 may be 90% of the right part. This is because, if the left part of mathematical expression 6 (the total area of ​​the second through holes (TH2)) is greater than 90% of the right part, there is a possibility that the bobbin will break.

[0258] In addition, as the width (b1, b2) in the horizontal direction of the second through hole (TH2: TH21, TH22) increases, the heat dissipation performance increases, but the width (b1, b2) can be determined so that the bobbin part (120C) is not damaged. This is because, if the width (b1, b2) increases, the bobbin part (120C) may be damaged.

[0259] In addition, according to an embodiment, at least one of the first gaps (YG1) between the plurality of upper core segments (112C1, 112C2, 112C3) formed by the upper gap-maintaining members (USTR, USTL) or the second gaps (YG2) between the plurality of lower core segments (114C1, 114C2, 114C3) formed by the lower gap-maintaining members (LSTR, LSTL) can be connected to the second through-hole (TH2) in a third direction by overlapping.

[0260] When air flows in the -y-axis direction by a fan to dissipate heat from the magnetic element, if the second through hole (TH2) as in the embodiment is not formed, there is no gap inside the magnetic element, so the air only flows to the outside of the magnetic element, making it difficult to cool the inside of the magnetic element.

[0261] Additionally, this phenomenon may be aggravated if multiple upper core segments (112C1, 112C2, 112C3) and multiple lower core segments (114C1, 114C2, 114C3) are attached without being spaced apart from each other.

[0262] On the other hand, according to another embodiment described above, when air flows in the -y-axis direction by a fan for dissipating heat from the magnetic element (100C), the heat generated in the middle portion (CL31, CL32) of the core portion (110C) by the fringe flux and the heat of the coil portion (130B) can be discharged to the outside of the bobbin portion (120C) through the second through hole (TH2). In particular, according to another embodiment, the heat discharged to the outside of the bobbin portion (120C) can be discharged to the outside through the first and second gaps (YG1, YG2) of the core portion (110C). Therefore, the magnetic element (100C) according to the embodiment can be usefully used for a high-power module that generates a lot of heat, such as a 40 kW-class rapid charging module. In addition, when a plurality of upper core segments (112C1, 112C2, 112C3) and a plurality of lower core segments (114C1, 114C2, 114C3) are not spaced apart from each other but are attached to each other, the inductance fluctuates and a constant inductance cannot be guaranteed. In addition, when an upper gap maintaining portion (USTR, USTL) or a lower gap maintaining portion (LSTR, LSTL) does not exist, the core portion (110C) can be easily damaged due to vibration between a plurality of upper core segments (112C1, 112C2, 112C3) and a plurality of lower core segments (114C1, 114C2, 114C3).

[0263] However, according to an embodiment, by arranging upper spacers (USTR, USTL) or lower spacers (LSTR, LSTL), a plurality of upper core segments (112C1, 112C2, 112C3) and a plurality of lower core segments (114C1, 114C2, 114C3) may be spaced apart from each other to ensure a constant inductance while preventing damage to the core portion (110C). In addition, the surface area that air can come into contact with in the plurality of upper core segments (112C1, 112C2, 112C3) and the plurality of lower core segments (114C1, 114C2, 114C3) may be increased by the upper spacer (USTR, USTL) or the lower spacer (LSTR, LSTL), thereby further improving the heat dissipation effect. FIGS. 23A to 23C are plan views illustrating various outer upper protrusions of a magnetic element according to an embodiment.

[0264] The magnetic elements illustrated in FIGS. 23a and 23c are identical to the magnetic elements illustrated in FIG. 18a except for the different shapes of the outer upper protrusions (40, 44), and therefore, a duplicate description thereof will be omitted. In addition, FIG. 23b corresponds to the magnetic element (100D) illustrated in FIG. 19a, and therefore, a duplicate description thereof will be omitted for the same portions.

[0265] As described above, the outer upper protrusions (40, 44, CV1, CV2, CV3, CV4, CV5, CV6, CV7, CV8) serve to cover the periphery (CPP1, CPP2) of the coil portion (130B) to prevent the periphery (CPP1, CPP2) from escaping. In this way, the outer upper protrusions (40, 44, CV1, CV2, CV3, CV4, CV5, CV6, CV7, CV8) serve as a separation prevention member to prevent the coil portion (130B) wound on the bobbin portion (120C) from escaping. However, when the outer upper protrusions cover both the periphery (CPP1, CPP2) of the coil portion and the outer portion (COP1, COP2) including the central portion (CCP), there is an advantage in that the coil portion can be prevented from escaping, but since it is difficult for the coil portion to come into contact with the air, it may be difficult to effectively dissipate the heat of the coil portion.

[0266] Accordingly, as illustrated in FIGS. 23a to 23c, the outer upper protrusions (40, CV5, 44, CV1, CV2, CV3, CV4) cover at least a portion of the peripheral portions (CPP1, CPP2) without covering the central portion (CCP) of the coil portion (130B), thereby minimizing the size of the outer upper protrusions (40, CV5, 44, CV1, CV2, CV3, CV4) or determining their shapes and positions.

[0267] In addition, as shown in FIGS. 23a and 23c, if the outer edges (40P, 44P) of the outer upper protrusions (40, 44) are formed to be angled, the coil may be damaged when winding the coil. Therefore, as shown in FIG. 18a or FIG. 23b, by forming the outer surfaces (SP3, SP5) of the outer upper protrusions (CV1, CV5) to be rounded, damage to the coil can be prevented when winding the coil portion (130B).

[0268] Fig. 24a shows a bottom perspective view of the magnetic element illustrated in Fig. 23a, and Fig. 24b shows a bottom perspective view of the magnetic element (100D) illustrated in Figs. 19a and 23b.

[0269] Also, when air is drawn in by a fan in the -y-axis direction in FIGS. 18a, 23a to 23c, 24a, and 24b, the air flows in the direction indicated by the arrow. At this time, in the case of FIGS. 23a, 23c, and 24a, the wind flow may be greatly hindered due to the angular shape of the outer upper protrusions (40, 44). However, as shown in FIGS. 18a, 23b, and 24b, when the outer surfaces of the outer upper protrusions (CV1, CV5) are formed in a rounded curve, the air flow may be alleviated compared to FIGS. 23a, 23c, and 24a. In particular, when the outer upper protrusion (CV1) has a planar shape like a shark fin as shown in FIG. 18a, the air flow is most active, so that heat dissipation performance may be improved.

[0270] As described above, the magnetic element (100C) according to another embodiment can lower the temperature of the magnetic element (100C) by 10°C or more by allowing external air to flow into the interior of the midfoot (CL31, CL32).

[0271] In addition, if the bobbin part (120C) is not arranged, the coil part (130B) is easily damaged by the sharp parts (CP1A, CP1B) of the corners of the core part (114C), so that the core part (114C) and the coil part (130B) are not electrically insulated from each other and a short circuit may occur, which may cause problems in driving. To prevent this, according to an embodiment, after winding the coil part (130B) on the bobbin part (120C), the core part (110C) is assembled on the bobbin part (120C), thereby preventing this problem.

[0272] Hereinafter, with reference to FIG. 13, the assembly process of a magnetic element (100C) according to another embodiment is described as follows.

[0273] The coil portion (130B) is wound in a form that wraps around the outside of the fifth body portion (B5) of the bobbin portion (120C). The coil portion (130B) can be wound in an amount corresponding to the space between the outer legs (OL311, OL312, OL321, OL322) and the middle legs (CL31, CL32) of the first core (112C) and the second core (114C).

[0274] After winding the coil part (130B) on the fifth body part (B5) of the bobbin part (120C), when the middle leg (CL32) of the second core (114C) is inserted into the first through hole (TH1) formed in the fifth body part (B5) of the bobbin (120C), the coil part (130B) wound on the fifth body part (B5) of the bobbin (120C) is inserted into the space between the middle leg (CL32) of the second core (114C) and each outer leg (OL321, OL322). The first core (112C) can also be coupled to the upper portion of the fifth body part (B5) of the bobbin part (120C) in the same manner as the second core (114C).

[0275] Although the above has been described focusing on embodiments, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

[0276] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0277] The magnetic element according to the embodiment can be used in an instrument transformer, an AC calculator, a DC-DC converter, a step-up transformer, a step-down transformer, etc.

Claims

1. A core portion including a first core and a second core arranged opposite to the first core in a first direction; A bobbin portion at least partially disposed within the core portion; and It includes a coil section including an upper coil and a lower coil arranged in the bobbin section, The upper coil and the lower coil are magnetic elements arranged spaced apart from each other in the first direction.

2. In paragraph 1, Each of the first and second cores above First body part; A first outer leg protruding from one of the two ends of the first body part in the first direction and extending along a second direction intersecting the first direction; A second outer leg protruding in the first direction from the other end of the first body part and extending along the second direction; and A magnetic element including a midfoot portion protruding in the first direction between the first outer portion and the second outer portion and extending along the second direction.

3. In paragraph 2, The upper coil is at least partially disposed between each of the first and second outer legs of the first core and the middle leg, The lower coil is a magnetic element at least partially disposed between each of the first and second outer legs of the second core and the middle leg.

4. In paragraph 2, The above bobbin part A second body part in which the upper coil and the lower coil are spaced apart from each other in the first direction; A first upper protrusion protruding from the upper end of the second body portion in a third direction intersecting the first and second directions, respectively; and A magnetic element including a first lower protrusion protruding in the third direction from the lower end of the second body portion.

5. In paragraph 4, The above first upper protrusion A first upper protrusion disposed between the first outer foot and the middle foot of the first core; and A magnetic element comprising a first-second upper protrusion positioned between the second outer portion and the middle portion of the first core and located on an opposite side of the first-first upper protrusion in the third direction.

6. In paragraph 4, The above first lower protrusion A first-first lower protrusion disposed between the first outer foot and the middle foot of the second core; and A magnetic element comprising a first-second lower protrusion positioned between the second outer portion and the middle portion of the second core and located on an opposite side of the first-first lower protrusion in the third direction.

7. In paragraph 4, The above bobbin part A magnetic element further comprising a coil support portion that protrudes horizontally from the second body portion between the first upper protrusion portion and the first lower protrusion portion and supports the upper coil.

8. In paragraph 4, A magnetic element in which the first upper protrusion and the first lower protrusion overlap in the first direction.

9. In paragraph 4, The above second body part Including a first through hole penetrating the second body part in the first direction, A magnetic element in which the intermediate portion of each of the first and second cores is inserted and arranged in the first through hole.

10. In paragraph 9, The above first through hole has a first length in the first direction, The midfoot of the first core has a second length in the first direction, The midfoot of the second core has a third length in the first direction, A magnetic element in which the sum of the second length and the third length is less than the first length.

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