KR20240094785A - Magnetic component and circuit board including the same - Google Patents

Abstract

The magnetic element according to the embodiment includes a core portion including an upper core and a lower core, a first coil portion, a second coil portion, and a molding portion disposed on an outer surface of the second coil portion, and the first coil portion includes, It has a first hollow through which the midfoot of the core part penetrates, and includes a first bobbin at least partially accommodated in the core part, a first coil disposed in the first receiving space of the first bobbin, and a first pin connected to the first coil, The second coil portion has a second hollow in which at least a portion of the first bobbin is accommodated, a second bobbin disposed outside the first bobbin, a second coil disposed in the second receiving space of the second bobbin, and a second coil. It includes a second pin connected to, and the second bobbin includes a core region that overlaps in a vertical direction with the core portion and a non-core region that does not overlap in a vertical direction with the core portion, and includes a groove formed in the non-core region.

Description

Magnetic element and circuit board including the same {MAGNETIC COMPONENT AND CIRCUIT BOARD INCLUDING THE SAME}

The embodiment relates to a magnetic element and a circuit board including the same.

Power supplies for electronic devices are equipped with various coil components such as transformers and line filters.

Transformers can be included in electronic devices for various purposes. For example, a transformer can be used to perform the function of transferring energy from one circuit to another. Additionally, a transformer may be used to perform a step-up or step-down function that changes the magnitude of voltage. In addition, a transformer, which has the characteristic of not directly forming any DC path because it is only inductively coupled between the primary and secondary windings, can be used for the purpose of blocking direct current and passing alternating current, or for insulation separation between two circuits. .

Figure 1 is an exploded perspective view showing an example of a general transformer configuration.

Referring to FIG. 1, a general transformer 10 has a core portion including an upper core 11 and a lower core 12, and a secondary coil 13 and a primary coil 14 between them 11 and 12. ) includes. The secondary coil 13 is made up of a plurality of conductive metal plates, and the primary coil 14 usually has a conductive wire wound. Depending on the configuration, a bobbin (not shown) may be placed between the upper core 11 and the lower core 12.

In the transformer shown in Figure 1, the primary and secondary coils overlap in the vertical direction. When a conductive wire is applied to the secondary coil instead of a conductive metal plate, the primary and secondary coils overlap in the horizontal direction. can be placed.

However, when a plurality of different coils are disposed, such as in a transformer, there is a minimum insulation distance that must be satisfied between the coils or between the coil and the core depending on the requirements of the circuit in which the corresponding magnetic element is disposed. However, when a plurality of different coils are arranged horizontally, the coils must be spaced horizontally from each other to ensure an insulation distance, so the planar area of the magnetic element increases, limiting miniaturization. To overcome this, a molding part is formed on the transformer. In this case, depending on the location of the injection port through which insulating filler is injected to form the molding part, there is a problem that the transformer becomes vulnerable to surge, so research on this is in progress.

Republic of Korea Patent Publication No. 10-2012-0076299 (2012.07.09.) (Title of invention: Transformer and flat panel display device comprising the same)

The technical task according to the embodiment is to provide a magnetic element resistant to surges and a circuit board including the same.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

A magnetic device according to an embodiment includes a core portion including an upper core and a lower core; a first coil portion and a second coil portion each accommodated at least in part between the upper core and the lower core; and a molding portion disposed on an outer surface of the second coil portion, wherein the first coil portion includes: a first bobbin having a first hollow through which a midfoot of the core portion penetrates, and at least a portion of which is accommodated within the core portion; a first coil disposed in a first receiving space of the first bobbin; and a first pin connected to the first coil, wherein the second coil unit includes a second bobbin disposed outside the first bobbin and a second hollow in which at least a portion of the first bobbin is accommodated. a second coil disposed in a second receiving space of the second bobbin; and a second pin connected to the second coil, wherein the second bobbin includes a core region that overlaps the core portion in a vertical direction. and a non-core region that does not overlap the core portion in the vertical direction, and may include a groove formed in the non-core region.

For example, the groove may be formed on a side of the non-core region.

For example, the non-core area may include: a first non-core area adjacent to one side of the core portion and connected to the second pin; and a second non-core region adjacent to the other side opposite to the one side of the core portion and connected to the first fin, wherein the groove includes a first groove disposed in the first non-core region; Alternatively, it may include at least one of a second groove disposed in the second non-core area.

For example, each of the first groove or the second groove may include a plurality of grooves spaced apart from each other.

For example, the first groove and the second groove may be arranged to face each other diagonally on a plane.

For example, the shortest point along the outer surface of the second bobbin is from a first point that is an outer point of the boundary between the core region and the non-core region to a second point where the second pin protrudes outward from the second bobbin. It has a first path on a plane forming a distance, and the first groove can be arranged closer to the second point than to the first point on the first path.

For example, the outer surface of the second bobbin on a plane from a first point that is an outer point of the boundary between the core region and the non-core region to a second point where the second pin protrudes outward from the second bobbin. There is a first path forming the shortest distance along the first path, and the first groove may be arranged to be spaced apart from the first point on the first path by more than half the length of the first path.

For example, the length of the first path may be 8 mm or more. In this case, the distance from the first point on the first path to the first groove and the distance from the first groove to the second point on the first path may each be 4 mm or more.

For example, the groove may be disposed on a surface of the second bobbin in the direction in which the second pin protrudes.

For example, the first groove may be formed on the outer surface or upper surface of the second bobbin.

A circuit board including a magnetic element according to another embodiment includes: a substrate; and a magnetic element disposed on the substrate, wherein the magnetic element includes: a core portion including an upper core and a lower core; a first coil portion and a second coil portion each accommodated at least in part between the upper core and the lower core; and a molding portion disposed on an outer surface of the second coil portion, wherein the first coil portion includes: a first bobbin having a first hollow through which a midfoot of the core portion penetrates, and at least a portion of which is accommodated within the core portion; a first coil disposed in a first receiving space of the first bobbin; and a first pin connected to the first coil, wherein the second coil unit includes a second bobbin disposed outside the first bobbin and a second hollow in which at least a portion of the first bobbin is accommodated. a second coil disposed in a second receiving space of the second bobbin; and a second pin connected to the second coil, wherein the second bobbin includes a core region that overlaps the core portion in a vertical direction. and a non-core region that does not overlap the core portion in the vertical direction and in which a resin injection hole is formed.

For example, the resin injection hole may include a groove, hole, or protrusion shape.

For example, the resin injection hole may have a rougher surface roughness on the outer surface of the molding part than the surrounding area.

The magnetic element according to the embodiment and the circuit board including the same can be made robust against surges by setting the position of the resin injection hole.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

Figure 1 is an exploded perspective view showing an example of a general transformer configuration.
FIG. 2A is a plan view of a transformer according to an embodiment, and FIG. 2B is a plan view of the transformer shown in FIG. 2A with the core portion removed.
FIG. 3A is a plan view of a transformer according to another embodiment, and FIG. 3B is a plan view of the transformer shown in FIG. 3A with the core portion removed.
Figure 4 shows a cross-sectional view of the transformer shown in Figures 2a and 3a taken along line II'.
FIG. 5 shows a perspective view of the first coil portion shown in FIG. 2A according to an embodiment.
FIG. 6 shows a perspective view of the second coil unit shown in FIG. 2A according to an embodiment.
Figure 7 is an enlarged view of portion 'A' shown in Figure 4.
FIG. 8 is an enlarged view of portion 'B' shown in FIG. 3A.
Figure 9 shows an exploded side view of the transformer according to the above-described embodiment.
10A to 10D show a side view of a process according to an embodiment of the transformer.
Figure 11 shows a side view of a circuit board according to an embodiment.

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

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

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

In the description of the embodiments, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or pattern. The description of being formed includes all being formed directly or through another layer. The standards for top/top or bottom/bottom of each floor are explained based on the drawing. Additionally, 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.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

Hereinafter, a magnetic element according to an example and a circuit board including the same will be described using a Cartesian coordinate system, but the example is not limited thereto. That is, according to the Cartesian coordinate system, the x-axis, y-axis, and z-axis are orthogonal to each other, but the embodiment is not limited to this. That is, the x-axis, y-axis, and z-axis can intersect each other instead of being perpendicular. Additionally, for convenience of explanation, the +x-axis or -x direction is referred to as the 'second direction', the +y-axis or -y direction is referred to as the 'first direction', and the +z-axis or -z direction is referred to as the 'vertical direction'. and at least one of the first or second directions is called the 'horizontal direction'.

Hereinafter, a transformer as an example of a magnetic element according to an embodiment will be described in detail with reference to the attached drawings.

FIG. 2A is a plan view of the transformer 100A according to an embodiment, and FIG. 2B is a plan view of the transformer 100A shown in FIG. 2A with the core portion 110 removed.

FIG. 3A is a plan view of a transformer 100B according to another embodiment, and FIG. 3B is a plan view of the transformer 100B shown in FIG. 3A with the core portion 110 removed.

FIG. 4 shows a cross-sectional view of the transformers 100A and 100B shown in FIGS. 2A and 3A along the line II′.

2A to 4, the transformer (100A, 100B) according to the embodiment includes a core portion (110), a first coil portion (120: 120A, 120B), and a second coil portion (130: 130A, 130B). It can be included.

The core portion 110 has the characteristics of a magnetic circuit and can serve as a passage for magnetic flux. The core portion 110 may include an upper core 111 coupled from the upper side and a lower core 112 coupled from the lower side. The two cores 111 and 112 may be vertically symmetrical or may be asymmetrical. However, in the following description, it is assumed that the shape is vertically symmetrical for convenience of explanation.

Each of the upper core 111 and the lower core 112 may include a flat body portion and a plurality of leg portions that protrude in a vertical direction from the body portion and extend along a predetermined direction. The plurality of leg portions include two outer legs (OL) extending along one axis direction (e.g., a first direction) on a plane and arranged to be spaced apart from each other along another axis direction (e.g., a second direction), and two outer legs (OL), It may include one metatarsal (CL) positioned between the dog's outer limbs.

When the upper core 111 and the lower core 112 are vertically coupled, the outer and middle feet of the upper core 111 each face the corresponding outer or middle feet of the lower core 112. At this time, a gap of a predetermined distance (for example, 10㎛ to 200㎛, but is not necessarily limited thereto) may be formed between at least some of the outer or midfoot pairs that face each other. In the case of Figure 4, the gap is illustrated as ‘0’.

Additionally, each of the upper core 111 and lower core 112 may include a magnetic material, for example, iron or ferrite, but is not necessarily limited thereto.

At least a portion of each of the first coil unit 120 and the second coil unit 130 may be accommodated between the upper core 111 and the lower core 112.

FIG. 5 shows a perspective view of the first coil unit 120A shown in FIG. 2A according to an embodiment, and FIG. 6 shows a perspective view of the second coil unit 130A shown in FIG. 2A according to an embodiment.

Hereinafter, only the first and second coil units 120A and 130A shown in FIG. 2A will be described, but the following description can also be applied to the first and second coil units 120B and 130B shown in FIG. 3A. . This is because, as shown in FIGS. 2B and 3B, except that the shapes of the non-core areas NCA1 and NCA2 are different, the first and second coil parts 120B and 130B are the first and second coil parts 120A. , 130A) because it has a similar shape.

The first coil unit 120A may include a first bobbin (B1), a first coil (C1), and a first pin (or first terminal) (P1).

The first bobbin (B1) has a first through hole (CH1, or first hollow) in the center through which the middle leg (CL) of the core portion 110 penetrates, and at least a portion of the first bobbin (B1) may be accommodated in the core portion 110. .

The first coil (C1) may be disposed in the first receiving space (SP1) of the first bobbin (B1) and wound to form a plurality of turns around the first through hole (CH1).

The first pin (P1) is connected to the first coil (C1) and is used as the input terminal (or output terminal) of the transformer. For this purpose, the first pin (P1) is a 1-1 pin (P11) connected to one end (C1E1) of the first coil (C1) and a 1-2 pin connected to the other end (C1E2) of the first coil (C1). (P12) may be included. As shown, the number of first pins P1 may be two, but the embodiment is not limited to a specific number of first pins P1.

The second coil unit 130A may include a second bobbin (B2), a second coil (C2), and a second pin (or second terminal) (P2).

The second bobbin (B2) has a second through hole (CH2, or second hollow) in the center in which at least a portion of the first bobbin (B1) is accommodated, and may be disposed outside the first bobbin (B1).

The second coil C2 may be disposed in the second accommodation space SP2 of the second bobbin B2 and may be wound to form a plurality of turns around the first through hole CH2.

The second pin (P2) is connected to the second coil (C2) and is used as the output terminal (or input terminal) of the transformer. To this end, the second pin P2 may include a plurality of pins P21 to P24 connected to one end and the other end of the second coil C2.

As shown, the number of second pins P2 may be four, but the embodiment is not limited to a specific number of second pins P2.

Here, at least a portion of the first coil unit 120A may be disposed in the second through hole CH2. Accordingly, at least a portion of the first coil unit 120A and the second coil unit 130A may overlap along the horizontal direction.

The first coil (C1) and the second coil (C2) may be a multiple winding of a rigid conductor metal, for example, a copper conductive wire wound several times in a spiral or planar spiral, but are not necessarily limited thereto. For example, the first coil C1 may be an enamel wire (USTC wire) wrapped with fiber yarn, a Litz wire, a triple insulated wire (TIW), etc.

Depending on the embodiment, the first coil unit (120: 120A, 120B) may correspond to the primary coil of the transformer (100: 100A, 100B), and the second coil unit (130: 130A, 130B) may correspond to the primary coil of the transformer (100) : 100A, 100B), but is not necessarily limited to this.

Additionally, the diameter of the second coil C2 may be 0.7 to 0.9 times the height of the second bobbin B2 in the third direction, but is not necessarily limited thereto.

Hereinafter, with reference to FIGS. 5 and 6, the first bobbin (B1) and the second bobbin (B2) will be described in more detail as follows.

The first bobbin (B1) according to one embodiment includes a first upper plate (TP1), a first lower plate (BP1), and a first side wall disposed between the first upper plate (TP1) and the first lower plate (BP1). It may include a part (SW1). The first side wall portion (SW1) defines the first through hole (CH1), and the first coil (C1) is accommodated together with the bottom surface of the first upper plate (TP1) and the upper surface of the first lower plate (BP1). 1 A receiving space (SP1) can be formed.

The second bobbin (B2) according to one embodiment includes a second upper plate (TP2), a second lower plate (BP2), and a second side wall disposed between the second upper plate (TP2) and the second lower plate (BP2). It may include part (SW2). The second side wall portion (SW2) defines a second hollow (CH2), in which the second coil (C2) is accommodated together with the bottom surface of the second upper plate (TP2) and the upper surface of the second lower plate (BP2). A receiving space (SP2) can be formed.

Referring again to FIG. 4, in the first coil portion 120, in a second direction from the first hollow CH1 toward the outer edge, from the outermost part of the first coil C1 to the outer side of the first bobbin B1 The distance D1 between the edges, and the second bobbin B2 from the outermost part of the second coil C2 in the second direction from the second hollow CH2 in the second coil portion 130 toward the outer edge. The distance D2 between the outer edges of the transformers 100 (100A, 100B) may be determined according to the minimum insulation distance required in the circuit. Ultimately, even if the first and second coils (C1, C2) are not disposed in the first and second accommodation spaces (SP1, SP2) of the first bobbin (B1) and the second bobbin (B2), the insulation distance is secured. An empty space is created, and this empty space is not desirable for miniaturization of the transformer (100: 100A, 100B).

Therefore, according to the embodiment, in each of the first and second accommodation spaces (SP1, SP2) in the first and second bobbins (B1, B2), a space in which the first and second coils (C1, C2) are not disposed By embedding insulating filler in the coils, the insulation performance between the coils and between the coils and the core is improved, thereby reducing the distance between the outermost edges of the coils (C1, C2) and the edges of the bobbins (B1, B2), thereby making the transformer more compact. .

Hereinafter, to facilitate clear understanding, the part corresponding to the 'A' part, i.e., between the middle leg (CL) and one outer leg (OL) of the core portion 110, is shown in detail in FIG. 4 to represent the transformer (100: 100A, 100B). ) replaces the entire city of.

FIG. 7 is an enlarged view of portion ‘A’ shown in FIG. 4.

In order to mainly explain securing the insulation performance for each coil (C1, C2), in FIG. 7, each coil (C1, C2) is shown from the side wall portion (SW1, SW2) of the accommodation space of each bobbin (B1, B2). It is simplified and expressed as a rectangular area defined by a line extending in the third direction based on the outermost part of each coil (C1, C2).

Referring to Figure 7, the transformer (100: 100A, 100B) further includes first and second molding parts (140, 150).

The first molding part 140 is disposed on the outer surface of the first coil part 120. That is, the first molding part 140 may be disposed from the area where the first coil C1 is disposed in the first receiving space SP1 of the first bobbin B1 to the outer edge of the first bobbin B1. .

The second molding part 150 is disposed on the outer surface of the second coil part 130. That is, the second molding part 150 may be disposed in the second receiving space SP2 of the second bobbin B2 from the area where the second coil C2 is disposed to the outer edge of the second bobbin B2. .

In this way, the first molding part 140 may form the outer surface (i.e., outer peripheral surface) of the first coil part 120, and the second molding part 150 may form the outer surface of the second coil part 130. (i.e., the outer peripheral surface) can be formed.

For example, the first molding part 140 may be disposed between the second side wall part SW2 of the second bobbin B2 and the first coil C1.

Each of the first molding part 140 and the second molding part 150 may be formed of an insulating filler. Examples of insulating fillers include polymer resin-based materials, such as epoxy resin, but are not limited to any material as long as it is insulating and can maintain a certain shape after injection.

The first molding part 140 is formed by winding the first coil C1 around the first bobbin B1 and then injecting an insulating filler into the first receiving space SP1 of the first bobbin B1, that is, injection molding. It may be formed in any way, but is not necessarily limited to this.

Similarly, the second molding part 150 is formed by winding the second coil C2 around the second bobbin B2 and then injecting an insulating filler through a resin injection port (at least one of H1, H2, or H3 to be described later). It can be formed by molding. At this time, injection of the insulating filler through the resin injection port may be performed after coupling the first coil portion 120, in which the first molding portion 140 is formed first, to the second hollow CH2, but is not necessarily limited to this. This will be described in detail later.

In addition, in the case of the transformer shown in FIG. 7, the upper plate (TP1) of the first bobbin (B1) overlaps the upper surface of the second bobbin (B2) in the vertical direction (indicated as TP11), and the upper plate (TP1) of the first bobbin (B1) overlaps the upper surface of the second bobbin (B2) in the vertical direction. The lower plate BP2 may overlap (represented by BP21) the lower surface of the first bobbin B1 and the first molding part 140, respectively, in the vertical direction.

Due to the arrangement of the first molding part 140 and the second molding part 150, better insulation performance is achieved for the same distance compared to the case where air is arranged between the insulating objects as shown in FIG. 4. Therefore, even if the horizontal distance ( The horizontal distance for satisfaction (X2) may also be shorter than in the case (D2) of FIG. 4. Ultimately, due to the arrangement of the first molding part 140 and the second molding part 150, the horizontal distance for securing the insulation distance of each bobbin is shortened, so that the first coil part 120 and the second coil part 130, respectively, are shortened. The planar area of decreases, which means that the core portion 110 can also be miniaturized accordingly. Therefore, as the size of the magnetic element decreases, the magnetic path also becomes shorter, so the effect of reducing heat generation and improving efficiency can be expected. In addition, it goes without saying that the withstand voltage performance and surge stability are improved by satisfying the actual insulation distance conditions.

Hereinafter, the resin injection port according to the embodiment through which the insulating filler is injected to form the second molding part 150 in the above-described transformer (100: 100A, 100B) will be described with reference to the attached drawings.

Referring to FIGS. 2B and 3B , the second bobbins 130A and 130B may include a core area (CA) and a non-core area (NCA).

The core area (CA) is defined as an area that overlaps the core unit 110 in the vertical direction, and the non-core area (NCA) is defined as an area that does not overlap the core unit 110 in the vertical direction.

The resin injection holes H1, H2, and H3 according to the embodiment may be a molding or injection product area formed by a molding or injection method in the non-core area (NCA) rather than the core area (CA). Accordingly, traces of resin injection, such as grooves, holes, protrusions, or wear areas, may be formed in the molding or injection molding area corresponding to the resin injection ports H1, H2, and H3.

That is, the resin injection hole may include a groove, hole, or protrusion shape.

Additionally, the resin injection hole may have a rougher surface roughness on the outer surface of the second molding part 150 than the surrounding area.

The non-core area (NCA) may include a first non-core area (NCA1) and a second non-core area (NCA2).

The first non-core area (NCA1) is adjacent to one side (110P1) of the core portion 110 and may be an area connected to the second pin (P2). Additionally, the second non-core area NCA2 may be an area adjacent to the other side 110P2 opposite to the one side 110P1 of the core portion 110 and connected to the first pin P1.

The first non-core area NCA1 and the second non-core area NCA2 may face each other in a first direction crossing the vertical direction with the core area CA interposed therebetween.

The resin injection hole may include at least one of the first resin injection hole (H1), the second resin injection hole (H2), or the third resin injection hole (H3). Each of the first and third resin injection holes H1 and H3 may be disposed in the first non-core area NCA1, and the second resin injection hole H2 may be disposed in the second non-core area NCA2.

If the first, second, or third resin inlet (H1, H2, H3) is disposed in the core area (CA), an area that does not satisfy the insulation distance may occur. At this time, when the resin injection hole is disposed in the core area CA, a surge may be caused by the second coil C2. However, according to the embodiment, since the resin injection ports H1, H2, and H3 are disposed in the non-core area (NCA), the surge is eliminated and the device can be robust against surge.

If the resin injection hole includes both the first and second resin injection holes (H1 and H2), the first resin injection hole (H1) and the second resin injection hole (H2) are flat as shown in FIGS. 2B and 3B. They may be arranged diagonally opposite each other on the screen, but the embodiment is not limited to this.

FIG. 8 is an enlarged view of part ‘B’ shown in FIG. 3A.

Additionally, according to an embodiment, at least one of the first, second, or third resin injection ports (H1, H2, and H3) may be formed on the outer surface or upper surface of the second bobbins (130A, 130B). For example, as shown in FIG. 6, the second resin injection port H2 may be formed on the outer surface of the second bobbin 130B.

In this way, each of the first and second resin injection holes (H1, H2) is formed on the side of the non-core area (NCA), while the third resin injection hole (H3) is formed on the second pin (P2) of the second bobbin (B2). ) may be placed on the surface in the direction in which it protrudes.

Additionally, the resin injection ports H1, H2, and H3 may overlap in the horizontal direction a portion where the upper core 111, the lower core 112, and the second molding portion 150 contact each other. To facilitate understanding, this first resin injection port H1 is indicated by a dotted line in FIG. 7 .

Each of the resin injection ports H1, H2, and H3 may include a plurality of grooves spaced apart from each other.

To aid understanding, the first and second outer edges (or boundaries) OS1 and OS2 in FIGS. 2A, 3A, and 8 are highlighted with thick solid lines.

According to the embodiment, the second pin (P2) protrudes outward from the second bobbin (B2) from the first point (PO1), which is an outer point of the boundary (110P1) between the core area (CA) and the non-core area (NCA). It has a first path (OS1) on a plane forming the shortest distance along the outer surface of the second bobbin (B2) to the second point (PO2), and the first resin injection port (H1) has a first path (OS1). It may be placed closer to the second point PO2 than to the first point PO1.

Additionally, the first resin injection port H1 may be arranged to be spaced apart from the first point PO1 on the first path OS1 by more than half the length of the first path OS1.

According to the embodiment, the first resin injection port (H1) is located at the first outer portion (OS1) on the plane of the second bobbin (B2) located between one side (110P1) of the core portion 110 and the second pin (P2). It may be arranged to be spaced apart from one side 110P1 of the core portion 110 by more than half of the total length (hereinafter referred to as 'first length') L1.

In addition, the second resin injection hole (H2) is the entire length ( Hereinafter, it may be arranged to be spaced apart from the other side 110P2 of the core portion 110 by more than half of the 'second length' (L2).

In the first outer shell (OS1), the length (L3) from the first resin injection port (H1) to one side (110P1) of the core portion 110 (hereinafter referred to as 'third length') is equal to the following equation 1: You can.

When the first resin injection port (H1) is placed in a position that satisfies the above-mentioned equation (1), the transformer is more effective from the surge caused by the second coil (C2) than when it is placed in a position that does not satisfy equation (1). You can become stronger.

In addition, when the length from the first resin injection hole (H1) to the second pin (P2) in the first outer layer (OS1) is referred to as the fourth length (L4), the third length (L3) is the fourth length (L4). It can be greater than or equal to. When the third length (L3) is greater than or equal to the fourth length (L4) than when the third length (L3) is smaller than the fourth length (L4), the second coil (C2) or the core portion (110) Transformers can be more robust against surges caused by

In the second outer shell (OS2), the length (L5) from the second resin injection port (H2) to the other side (110P2) of the core portion 110 (hereinafter referred to as 'fifth length') is equal to the following equation 2: You can.

When the second resin injection port (H2) is placed in a position that satisfies the above-mentioned equation (2), more energy is generated by the second coil (C2) or the core portion (110) than when it is placed in a position that does not satisfy equation (2). Transformers can be more robust against the surges they cause.

In addition, when the length along the outer surface in the second outer surface OS2 from the second resin injection hole H2 to the first pin P1 is referred to as the sixth length L6, the fifth length L5 is the sixth length L6. 6 Length (L6) can be greater than or equal to. When the fifth length (L5) is greater than or equal to the sixth length (L6) than when the fifth length (L5) is smaller than the sixth length (L6), the second coil (C2) or the second core portion (110) ) can make the transformer more robust against surges caused by

According to an embodiment, each of the first and second lengths L1 and L2 may be 8 mm or more. In this case, each of the third length (L3) to the sixth length (L6) may be 4 mm or more.

According to the embodiment, the distance from the first point (PO1) to the first resin injection port (H1) on the first path (OS1) and the distance from the first resin injection port (H1) to the second point (PO2) on the first path (OS1) Each distance may be 4 mm or more.

The surge flowing through the second pin P2 (or the first pin P1) can be resolved when the first length L1 (or the second length L2) is 8 mm or more. In addition, when the fourth length (L4) (or sixth length (L6)) is 4 mm or more, the transformer can be more robust against surges introduced through the second pin (P2) (or first pin (P1)). .

Additionally, at least one of the first or second non-core areas NCA1 and NCA2 may include an adjacent area and a non-adjacent area. Referring to FIG. 3B, the first non-core area (NCA1) includes an adjacent area (NA1) and a non-adjacent area (NNA1), and the second non-core area (NCA2) includes an adjacent area (NA2) and a non-adjacent area ( NNA2) may be included.

Adjacent areas (NA1, NA2) are defined as areas adjacent to the core portion 110 among non-core areas (NCA1, NCA2), and non-adjacent areas (NNA1, NNA2) are adjacent areas (NNA1, NNA2) among non-core areas (NCA1, NCA2). It is defined as an area further away from the core portion 110 than NA1 and NA2).

3B and 8, in the vertical direction and the second direction intersecting the first direction, respectively, the first width W1 of the adjacent areas NA1 and NA2 is the second width W1 of the non-adjacent areas NNA1 and NNA2. It may be smaller than the width (W2).

Additionally, the non-adjacent areas NNA1 and NNA2 of at least one of the first outside OS1 and the second outside OS2 may protrude more outward in the second direction than the adjacent areas NA1 and NA2. For example, as shown in FIG. 3B, the non-adjacent areas (NNA1, NNA2) of each of the first outline (OS1) and the second outline (OS2) are moved outward in the second direction more than the adjacent areas (NA1, NA2). It may protrude further.

When the transformer (100: 100A, 100B) includes the first and second molding parts (140, 150), additional insulation performance can be secured without increasing the planar area of the transformer, and the size of the transformer in the horizontal direction can be increased. It can be reduced. However, as the size of the transformer in the horizontal direction increases, it may be difficult for the positions at which the first and second resin injection holes H1 and H2 are arranged to satisfy Equation 1 or 2 described above. To solve this, as shown in FIG. 3B, the non-adjacent areas (NNA1, NNA2) protrude further outward in the second direction than the adjacent areas (NA1, NA2) or the second width (W2) extends to the first width ( When larger than W1), even if the size of the transformer in the horizontal direction is reduced, the first and second lengths (L1, L2) are further increased compared to the case shown in FIG. 2b, making it easier to satisfy the above equation 1 or 2. You can lose.

In addition, when the non-adjacent areas (NNA1, NNA2) protrude further outward in the second direction than the adjacent areas (NA1, NA2) or the second width (W2) is larger than the first width (W1), the transformer is described later. When seated on the substrate 210 shown in FIG. 11, it may be guided by the protruding portion.

Hereinafter, a method of manufacturing a transformer according to an embodiment will be described with reference to the attached drawings.

Figure 9 shows an exploded side view of the transformer (100: 100A, 100B) according to the above-described embodiment, and Figures 10A to 10D show a process side view of the transformer (100: 100A, 100B) according to the embodiment.

9 and 10A to 10D, the transformer is the same as the above-described transformer (100: 100A, 100B), so the same reference numerals are used for the same parts, and overlapping descriptions are omitted.

First, prepare the first bobbin (B1) and the second bobbin (B2) as shown in FIG. 10A.

Thereafter, the first coil (C1) is wound on the first bobbin (B1) shown in FIG. 10A to form the first molding part 140.

Thereafter, after winding the second coil (C2) on the second bobbin (B2) shown in FIG. 10A, the first bobbin (B1) on which the first coil (C1) is wound is wound with the second coil (C2). Assemble on the second bobbin (B2).

Thereafter, the second molding portion 150 is formed by injecting the insulating filler through the above-described resin injection holes (H1, H2, H3). For example, when injecting an insulating filler into the resin injection port (H2) shown in FIG. 6, an empty space not occupied by the second coil (C2) within the second receiving space (SP2) as shown in FIG. 7 The second molding part 150 may be formed as shown in FIG. 10B.

Thereafter, the upper core 111 and the lower core 112 shown in FIG. 10C are assembled to the upper and lower parts of the resulting product shown in FIG. 10B, respectively, to complete the transformer as shown in FIG. 10D.

In addition, as described above, the transformers 100A and 100B according to the embodiment may form a circuit board that forms a power supply unit (PSU) together with other magnetic elements (eg, inductors).

Hereinafter, the circuit board 200 according to an embodiment including the above-described transformer will be described with reference to the attached drawings.

Figure 11 shows a side view of the circuit board 200 according to an embodiment.

The circuit board 200 shown in FIG. 11 may include a board (or printed circuit board (PCB)) 210 and a transformer 100.

The transformer 100 is disposed on the substrate 210 and corresponds to the transformers 100A and 100B according to the above-described embodiment, so redundant description will be omitted.

Although the above description focuses on examples, this is only an example and does not limit the present invention, and those skilled in the art will understand that the examples are as follows without departing from the essential characteristics of the present example. You will see that various variations and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

Claims (14)

A core portion including an upper core and a lower core;
a first coil portion and a second coil portion each accommodated at least in part between the upper core and the lower core; and
It includes a molding portion disposed on an outer surface of the second coil portion,
The first coil unit,
a first bobbin having a first hollow through which a midfoot of the core portion passes, and at least a portion of the bobbin accommodated within the core portion;
a first coil disposed in a first receiving space of the first bobbin; and
Includes a first pin connected to the first coil,
The second coil unit,
a second bobbin disposed outside the first bobbin and having a second hollow in which at least a portion of the first bobbin is accommodated;
a second coil disposed in a second receiving space of the second bobbin; and
Includes a second pin connected to the second coil,
The second bobbin is
a core region that overlaps the core portion in a vertical direction; and
Includes a non-core region that does not overlap the core portion in the vertical direction,
A magnetic element including a groove formed in the non-core region. According to claim 1,
The groove is a magnetic element formed on a side of the non-core region. The method of claim 1, wherein the non-core region is
a first non-core region adjacent to one side of the core portion and connected to the second fin; and
A second non-core region adjacent to the other side opposite to the one side of the core portion and connected to the first fin,
The groove is
a first groove disposed in the first non-core area; or
A magnetic element including at least one of second grooves disposed in the second non-core region. According to clause 3,
A magnetic element wherein each of the first groove or the second groove includes a plurality of grooves spaced apart from each other. The magnetic element of claim 3, wherein the first groove and the second groove are arranged to face each other diagonally on a plane. According to clause 2,
Forming the shortest distance along the outer surface of the second bobbin from a first point that is an outer point of the boundary between the core region and the non-core region to a second point where the second pin protrudes outward from the second bobbin. having a first path in a plane,
The first groove is a magnetic element disposed closer to the second point than the first point on the first path. According to clause 2,
The shortest distance along the outer surface of the second bobbin on a plane is from a first point, which is an outer point of the boundary between the core area and the non-core area, to a second point where the second pin protrudes outward from the second bobbin. Having a first path forming,
The first groove is a magnetic element disposed to be spaced apart from the first point on the first path by more than half the length of the first path. According to claim 6 or 7,
A magnetic element wherein the length of the first path is 8 mm or more. According to claim 6 or 7,
A magnetic element wherein the distance from the first point on the first path to the first groove and the distance from the first groove to the second point on the first path are each 4 mm or more. According to claim 1,
The groove is a magnetic element disposed on a surface of the second bobbin in a direction in which the second pin protrudes. The magnetic element of claim 3, wherein the first groove is formed on an outer surface or an upper surface of the second bobbin. Board; and
It includes a magnetic element disposed on the substrate,
The magnetic element is,
A core portion including an upper core and a lower core;
a first coil portion and a second coil portion each accommodated at least in part between the upper core and the lower core; and
It includes a molding portion disposed on an outer surface of the second coil portion,
The first coil unit,
a first bobbin having a first hollow through which a midfoot of the core portion passes, and at least a portion of the bobbin accommodated within the core portion;
a first coil disposed in a first receiving space of the first bobbin; and
Includes a first pin connected to the first coil,
The second coil unit,
a second bobbin disposed outside the first bobbin and having a second hollow in which at least a portion of the first bobbin is accommodated;
a second coil disposed in a second receiving space of the second bobbin; and
Includes a second pin connected to the second coil,
The second bobbin is
a core region that overlaps the core portion in a vertical direction; and
A circuit board including a non-core region that does not overlap the core portion in the vertical direction and in which a resin injection hole is formed. According to claim 12,
A circuit board wherein the resin injection hole includes a groove, hole, or protrusion shape. The method of claim 12 or 13,
A circuit board in which the resin injection hole has a rougher surface than the surrounding area on the outer surface of the molding part.