Transformer

Abstract

A transformer according to one embodiment comprises: a core part including an upper core and a lower core; and a coil part at least partially disposed in the core part. The core part includes a first outer leg, a second outer leg, and a middle leg disposed between the first outer leg and the second outer leg, and the coil part includes a first coil disposed adjacent to the middle leg, and a second coil adjacent to the first outer leg and the second leg. A first separation distance between the first coil and the middle leg is longer than a second separation distance between the first outer leg and the second coil.

Description

Transformers

[0001] The present invention relates to a transformer.

[0002] In general, an electronic device requires a driving power source to operate, and a power supply unit, such as a power supply unit (PSU), is essential to supply this driving power to the electronic device.

[0003] In particular, in display devices such as flat-panel TVs, slimming is required along with larger display sizes, so there is a challenge of reducing thickness while satisfying the increased power consumption of larger displays.

[0004] In a power supply unit (PSU), the transformer takes up a relatively large volume compared to other components, so in order to make it slimmer, it is common to consider omitting elements that take up a large amount of thickness within the transformer or adjusting the quantity.

[0005] For example, in the transformers that make up the power supply unit of recent flat panel display devices, the bobbin on which the primary and secondary coils are wound and fixed is omitted, or multiple slim transformers with low capacity are employed.

[0006] In the case of conventional slim transformers, due to thickness constraints, a horizontal winding method is adopted in which the primary / secondary coils are arranged horizontally.

[0007] For example, although a transformer can be made slimmer or smaller by increasing its switching frequency, there are problems such as reduced efficiency and heat generation due to increased switching loss. For example, when a transformer is made slimmer or smaller, when driven at a high frequency of 100 kHz or higher, not only does copper loss, core loss, loss due to the skin effect and proximity effect increase, but also, due to the fringing effect, when the magnetic flux passes through the gap, it bends outward and high heat generation occurs in the part where the coil overlaps with the gap area of ​​the middle foot where the magnetic flux distribution is high.

[0008] The technical problem to be achieved by the present invention is to provide a transformer capable of improving heat generation by arranging the distance between the intermediate coil and the primary coil so as to be outside the range of high magnetic flux distribution caused by the fringe effect.

[0009] 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 can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0010] A transformer according to one embodiment comprises: a core portion including an upper core and a lower core; and a coil portion at least partially disposed within the core portion; wherein the core portion includes a first outer group, a second outer group, and a middle group disposed between the first outer group and the second outer group; and wherein the coil portion includes a first coil disposed adjacent to the middle group and a second coil disposed on a side of the first coil and adjacent to the first outer group and the second outer group, wherein a first separation distance between the first coil and the middle group is longer than a second separation distance between the first outer group and the second coil.

[0011] In addition, the first separation distance may include a distance between the inner edge of the first coil and the edge of the middle leg, and the second separation distance may include a distance between the outer edge of the second coil and the edge of the first outer leg, or a distance between the outer edge of the second coil and the edge of the second outer leg.

[0012] In addition, the first coil and the second coil may be disposed partially between the first outer leg and the middle leg and between the middle leg and the second outer leg, and the outer edge of the first coil and the inner edge of the second coil may be spaced apart from each other in a first direction on a plane.

[0013] Additionally, the second coil may be disposed closer to the first outer group and the second outer group than the first coil based on the first direction on the plane.

[0014] Additionally, the first separation distance may include a distance of 5 mm or more and 7 mm or less.

[0015] Additionally, at least one of the first coil and the second coil may be formed in a predetermined pattern shape.

[0016] Additionally, the protrusion length of the middle toe protruding in the third direction on the vertical plane may be shorter than the protrusion length of the first outer toe protruding in the third direction or the protrusion length of the second outer toe protruding in the third direction.

[0017] In addition, it may include that a gap of a predetermined distance is formed between at least a portion of the first outer leg of the upper core and the first outer leg of the lower core, the second outer leg of the upper core and the second outer leg of the lower core, and the middle leg of the upper core and the middle leg of the lower core, which are opposed to each other.

[0018] A transformer according to one embodiment can reduce heat generation by arranging the separation distance between the intermediate coil and the primary coil so as to be outside the range of high magnetic flux distribution due to the fringe effect.

[0019] In addition, the transformer according to one embodiment can be made slim by forming at least one of the first coil and the second coil in a predetermined pattern shape.

[0020] 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 a person having ordinary skill in the art to which the present invention belongs from the description below.

[0021] Figure 1 is a perspective view of a transformer according to a first embodiment of the present invention.

[0022] Figure 2 is an exploded perspective view of Figure 1.

[0023] Figure 3 is a cross-section taken along line A-A' in Figure 1.

[0024] Figure 4 is a diagram for explaining the simulation results according to the first embodiment.

[0025] Figure 5 is an exploded perspective view of a transformer according to a second embodiment of the present invention.

[0026] Figure 6 is a plan view of Figure 5.

[0027] Figure 7 is a cross-section of Figure 5 taken in the same direction as Figure 3.

[0028] Figure 8 is a diagram for explaining simulation results according to the second embodiment.

[0029] Figure 9 is an exploded perspective view of a transformer according to a third embodiment of the present invention.

[0030] Figure 10 is a plan view of Figure 9.

[0031] Fig. 11 is a cross-section of Fig. 9 taken in the same direction as Fig. 3.

[0032] Figure 12 is a diagram for explaining simulation results according to the third embodiment.

[0033] Figure 13 is an exploded perspective view of a transformer according to a fourth embodiment of the present invention.

[0034] Figure 14 is a plan view of Figure 13.

[0035] Fig. 15 is a cross-section of Fig. 13 taken in the same direction as Fig. 3.

[0036] Figure 16 is a diagram for explaining simulation results according to the fourth embodiment.

[0037] 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.

[0038] Terms including ordinal numbers, such as "second," "first," 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 multiple related items described herein or any of multiple related items described herein.

[0039] 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.

[0040] In the description of 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 described 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 description, and therefore does not entirely reflect the actual size.

[0041] 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 preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0042] 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.

[0043] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing reference numerals, identical or corresponding components will be given the same reference numerals, and redundant descriptions thereof will be omitted. In addition, although the embodiments are described using the Cartesian coordinate system, it goes without saying that the embodiments may be described using other coordinate systems. In the Cartesian coordinate system, the x-axis, y-axis, and z-axis illustrated in each drawing are orthogonal to each other, but the embodiments are not limited thereto. The x-axis, y-axis, and z-axis may also intersect each other.

[0044] Hereinafter, a transformer according to the present embodiment will be described in detail with reference to the attached drawings.

[0045] FIG. 1 is a perspective view of a transformer according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a cross-section taken along line A-A' in FIG. 1.

[0046] Referring to FIGS. 1 to 3, a transformer according to the first embodiment of the present invention may include a core portion (100) and a coil portion (200). Hereinafter, each component will be described in detail.

[0047] The core portion (100) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (100) can include an upper core (110) coupled from the upper side and a lower core (120) coupled from the lower side.

[0048] The upper core (110) and the lower core (120) may have shapes that are symmetrical vertically or may have asymmetric shapes. However, in the description below, it is assumed that they have shapes that are symmetrical vertically for convenience of explanation.

[0049] Each of the upper core (110) and the lower core (120) may include a flat body portion and a plurality of leg portions (OL1, OL2, OL3, OL4, CL1, CL2) protruding from the body portion in the thickness direction (i.e., the z-axis direction or the third direction) and extending along a predetermined direction.

[0050] For example, the plurality of leg portions (OL1, OL2, CL1) of the upper core (110) may extend along the major axis (here, the y-axis or the second direction) direction on a plane and may include two outer legs (OL1, OL2) spaced apart from each other along the minor axis (here, the X-axis or the first direction) direction, and one middle leg (CL1) arranged between the two outer legs (OL1, OL2).

[0051] Here, the two exogroups (OL1, OL2) can be the first exogroup (OL1) and the second exogroup (OL2).

[0052] When the upper core (110) and the lower core (120) are connected vertically, each of the outer legs (OL1, OL2) and the middle leg (CL1) of the upper core (110) can face the corresponding outer legs (OL3, OL4) or middle leg (CL2) of the lower core (120).

[0053] For example, the pair of extremities (OL1, OL3) that are opposed to each other can be called the first extremity, the pair of extremities (OL2, OL4) that are opposed to each other can be called the second extremity, and the pair of intermediate feet (CL1, CL2) can be called the intermediate feet.

[0054] A gap of a predetermined distance may be formed between at least some of the opposing exopod pairs (OL1, OL2, OL3, OL4) or the intermediate toe pairs (CL1, CL2). For example, the protrusion length of the first exopod or the protrusion length of the second exopod may be formed to be longer than the protrusion length of the intermediate toe. Accordingly, the length of the gap of the opposing exopod pairs (OL1, OL2, OL3, OL4) may be formed to be shorter than the length of the gap of the intermediate toe pair (CL1, CL2). For example, the gap of the predetermined distance may be 10 μm to 200 μm. However, the present invention is not necessarily limited thereto.

[0055] The inductance of the core part (100) can be controlled by adjusting the gap size of each of one intermediate pair (CL1, CL2) and two outer pairs (OL1, OL2, OL3, OL4), and heat generation can be controlled according to the number of gaps.

[0056] Here, the cross-section shape of one metatarsal pair (CL1, CL2) may be a rectangular shape based on the cross-section cut along A-A'.

[0057] And the width of the intermediate legs (CL1, CL2) can be formed to be longer than the width of the first outer legs (OL1, OL3) or the width of the second outer legs (OL2, OL4). In this way, by forming the width of the intermediate legs (CL1, CL2) to be longer than the width of the first outer legs (OL1, OL3) or the width of the second outer legs (OL2, OL4), overlapping between coils can be prevented and the magnetic flux distribution of the coils can be spread outward.

[0058] Additionally, the core portion (100) may include a magnetic material. For example, the core portion (100) may include iron or ferrite, but is not necessarily limited thereto.

[0059] When the upper core (110) and the lower core (120) of the core part (100) are connected vertically, a first receiving space (S1) may be arranged between the first outer legs (OL1, OL3) and the middle legs (CL1, CL2), and a second receiving space (S2) may be arranged between the second outer legs (OL2, OL4) and the middle legs (CL1, CL2).

[0060] The first receiving space (S1) may be formed to receive a first coil (210) and a second coil (220) to be described later. The second receiving space (S2) may be formed to receive a first coil (210) and a second coil (220) to be described later.

[0061] The coil portion (200) may be a rigid conductive metal. For example, the coil portion (200) may be a multi-winding in which copper conductive wires are wound several times, but is not necessarily limited thereto. The coil portion (200) may include a first coil (210) and a second coil (220).

[0062] The first coil (210) can be partially accommodated in the first accommodation space (S1) and the second accommodation space (S2).

[0063] The second coil (220) may be arranged to be spaced apart from the first coil (210) in the X-axis direction (or the first direction, the short-axis direction) on a plane. Some of the second coil (220) may be accommodated in the first accommodation space (S1) and the second accommodation space (S2).

[0064] For example, the first coil (210) and the second coil (220) are partially arranged between the first outer legs (OL1, OL3) and the middle legs (CL1, CL2) and between the middle legs (CL1, CL2) and the second outer legs (OL2, OL4), and the outer edge of the first coil (210) and the inner edge of the second coil (220) can be spaced apart from each other in the first direction on the plane.

[0065] The first coil (210) may be positioned closer to the intermediate legs (CL1, CL2) than the second coil (220), and the second coil (220) may be positioned further from the intermediate legs (CL1, CL2) than the first coil (210). That is, the second coil (220) may be positioned closer to each of the two outer pairs (OL1, OL2, OL3, OL4) than the first coil (210).

[0066] The first separation distance (d11) between the first coil (210) and the intermediate legs (CL1, CL2) can be formed longer than the second separation distance (d12) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4).

[0067] That is, the second separation distance (d12) between the second coil (220) and the first outer pair (OL1, OL3) or the second separation distance (d12) between the second coil (220) and the second outer pair (OL2, OL4) can be formed shorter than the first separation distance (d11) between the first coil (210) and the intermediate pair (CL1, CL2).

[0068] For example, the first separation distance (d11) between the first coil (210) and the intermediate legs (CL1, CL2) may be the distance between the inner edge of the first coil (210) and the edge of the intermediate legs (CL1, CL2).

[0069] The second separation distance (d12) may be the distance between the outer edge of the second coil (220) and the edge of the first outer leg (OL1, OL3), or the distance between the outer edge of the second coil (220) and the edge of the second outer leg (OL2, OL4).

[0070] The first separation distance (d11) between the first coil (210) and the intermediate legs (CL1, CL2) can be formed to be approximately 5 mm to 7 mm. Accordingly, the first coil (210) can be positioned outside the high magnetic flux distribution range due to the fringe effect.

[0071] As described above, the present invention forms the first separation distance (d11) between the first coil (210) and the intermediate legs (CL1, CL2) longer than the second separation distance (d12) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4), thereby preventing the flow of magnetic flux due to the fringing effect around the intermediate legs and overlapping between the coils, and spreading the magnetic flux distribution of the coil to the outside.

[0072] In addition, at least one of the first coil (210) and the second coil (220) may be formed in a predetermined pattern shape. In this way, by forming at least one of the first coil (210) and the second coil (220) in a predetermined pattern shape, the transformer can be slimmed down or miniaturized.

[0073] Figure 4 is a diagram for explaining the simulation results according to the first embodiment.

[0074] Fig. 4 (a) is a simulation result based on a cross-section taken along line A-A' in Fig. 1, and Fig. 4 (b) is a simulation result based on a plan view of a transformer according to the first embodiment.

[0075] For example, the more red it goes (410), the more severe the fever is, and the more blue it goes (412), the less severe the fever is.

[0076] As illustrated in FIG. 4 (a) and FIG. 4 (b), in the present invention, the first separation distance (d11) between the first coil (210) and the intermediate pairs (CL1, CL2) is formed longer than the second separation distance (d12) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4), thereby allowing the first coil to be placed outside the high magnetic flux distribution range caused by the fringe effect. Accordingly, the present invention can improve heat generation by preventing the flow of magnetic flux caused by the fringe effect around the intermediate pairs and overlapping between coils, and spreading the magnetic flux distribution of the coils to the outside.

[0077] FIG. 5 is an exploded perspective view of a transformer according to a second embodiment of the present invention, FIG. 6 is a plan view of FIG. 5, and FIG. 7 is a cross-section of FIG. 5 taken in the same direction as FIG. 3.

[0078] Referring to FIGS. 5 to 7, a transformer according to a second embodiment of the present invention may include a core portion (100a) and a coil portion (200).

[0079] Since the core part (100a) and coil part (200) have been sufficiently described in detail in FIGS. 1 to 3, the description will focus on the changed parts here.

[0080] The core portion (100a) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (100a) can include an upper core (110a) coupled from the upper side and a lower core (120a) coupled from the lower side.

[0081] Each of the upper core (110a) and the lower core (120a) may include a body portion in the form of a flat plate and a plurality of leg portions (OL1, OL2, OL3, OL4, CL1a, CL2a) protruding from the body portion in the thickness direction (i.e., the z-axis direction or the third direction) and extending along a predetermined direction.

[0082] For example, the plurality of leg portions (OL1, OL2, CL1a) of the upper core (110a) may extend along the major axis (here, the y-axis or the second direction) direction on a plane and may include two outer legs (OL1, OL2) spaced apart from each other along the minor axis (here, the X-axis or the first direction) direction, and one middle leg (CL1a) arranged between the two outer legs (OL1, OL2).

[0083] When the upper core (110a) and the lower core (120a) are connected vertically, each of the outer legs (OL1, OL2) and the middle leg (CL1a) of the upper core (110a) can face the corresponding outer legs (OL3, OL4) or middle leg (CL2a) of the lower core (120a).

[0084] For example, the pair of extremities (OL1, OL3) that are opposed to each other can be called the first extremity, the pair of extremities (OL2, OL4) that are opposed to each other can be called the second extremity, and the pair of intermediate feet (CL1a, CL2a) can be called the intermediate feet.

[0085] At this time, one pair of metatarsals (CL1a, CL2a) may have a rectangular cross-section shape cut along the third direction as illustrated in Fig. 6, but may also have a fillet shape. Accordingly, one pair of metatarsals (CL1a, CL2a) may include at least one side (SU, SD, SR, SL) having a predetermined R value. Here, R may denote a radius of curvature, but the embodiment is not limited thereto.

[0086] The first separation distance (d21) between the first coil (210) and the intermediate legs (CL1a, CL2a) can be formed longer than the second separation distance (d22) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4).

[0087] The following description is omitted as it has been sufficiently explained in FIGS. 1 to 3.

[0088] Figure 8 is a diagram for explaining simulation results according to the second embodiment.

[0089] Fig. 8 (a) is a simulation result based on a cross-section of Fig. 5 cut in the same direction as Fig. 3, and Fig. 8 (b) is a simulation result based on a plan view of a transformer according to the second embodiment.

[0090] For example, the more red it goes (420), the more severe the fever is, and the more blue it goes (422), the less severe the fever is.

[0091] As illustrated in (a) and (b) of FIG. 8, the present invention can form the first separation distance (d21) between the first coil (210) and the intermediate legs (CL1a, CL2a) to be longer than the second separation distance (d22) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4) in order to place the first coil outside the high magnetic flux distribution range due to the fringe effect. In addition, the present invention can include at least one side (SU, SD, SR, SL) having a predetermined R value in the shape of the intermediate legs (CL1a, CL2a) in order to reduce the fringe flux generated in the intermediate legs (CL1a, CL2a).

[0092] Accordingly, the present invention can improve heat generation by preventing the flow of magnetic flux due to the fringing effect around the intermediate legs (CL1a, CL2a) and overlapping between coils and spreading the magnetic flux distribution of the coils to the outside, and can also reduce the flux concentrated in the intermediate legs (CL1a, CL2a) and reduce the overall magnetic flux distribution.

[0093] FIG. 9 is an exploded perspective view of a transformer according to a third embodiment of the present invention, FIG. 10 is a plan view of FIG. 9, and FIG. 11 is a cross-section of FIG. 9 taken in the same direction as FIG. 3.

[0094] Referring to FIGS. 9 to 11, a transformer according to a third embodiment of the present invention may include a core portion (100b) and a coil portion (200).

[0095] Since the core part (100b) and coil part (200) have been sufficiently described in detail in FIGS. 1 to 3, the description will focus on the changed parts here.

[0096] The core portion (100b) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (100b) can include an upper core (110b) coupled from the upper side and a lower core (120b) coupled from the lower side.

[0097] Each of the upper core (110b) and the lower core (120b) may include a body portion in the form of a flat plate and a plurality of leg portions (OL1, OL2, OL3, OL4, CL1b, CL2b) protruding from the body portion in the thickness direction (i.e., the z-axis direction or the third direction) and extending along a predetermined direction.

[0098] For example, the plurality of leg portions (OL1, OL2, CL1b) of the upper core (110b) may extend along the major axis (here, the y-axis or the second direction) direction on a plane and may include two outer legs (OL1, OL2) spaced apart from each other along the minor axis (here, the x-axis or the first direction) direction, and one middle leg (CL1b) arranged between the two outer legs (OL1, OL2).

[0099] When the upper core (110b) and the lower core (120b) are connected vertically, each of the outer legs (OL1, OL2) and the middle leg (CL1b) of the upper core (110b) can face the corresponding outer legs (OL3, OL4) or middle leg (CL2b) of the lower core (120b).

[0100] For example, the pair of extremities (OL1, OL3) that are opposed to each other can be called the first extremity, the pair of extremities (OL2, OL4) that are opposed to each other can be called the second extremity, and the pair of intermediate feet (CL1b, CL2b) can be called the intermediate feet.

[0101] At this time, one metatarsal pair (CL1b, CL2b) may have an elliptical shape in the cross-section shape cut with respect to the third direction as illustrated in Fig. 10.

[0102] The first separation distance (d31) between the first coil (210) and the intermediate legs (CL1b, CL2b) can be formed longer than the second separation distance (d32) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4).

[0103] The following description is omitted as it has been sufficiently explained in FIGS. 1 to 3.

[0104] Figure 12 is a diagram for explaining simulation results according to the third embodiment.

[0105] Fig. 12 (a) is a simulation result based on a cross-section of Fig. 9 cut in the same direction as Fig. 3, and Fig. 12 (b) is a simulation result based on a plan view of a transformer according to the third embodiment.

[0106] For example, the more red it goes (430), the more severe the fever is, and the more blue it goes (432), the less severe the fever is.

[0107] As shown in (a) and (b) of FIG. 12, the present invention can form the first separation distance (d31) between the first coil (210) and the intermediate legs (CL1b, CL2b) to be longer than the second separation distance (d32) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4) in order to place the first coil outside the high magnetic flux distribution range due to the fringing effect. In addition, the present invention can form the intermediate legs (CL1b, CL2b) in an elliptical shape in order to reduce the fringing flux generated in the intermediate legs (CL1b, CL2b). That is, the shape of the intermediate legs (CL1b, CL2b) can be such that the edge portion of the intermediate legs is formed in an elliptical shape.

[0108] Accordingly, the present invention can improve heat generation by preventing the flow of magnetic flux due to the fringing effect around the intermediate legs (CL1b, CL2b) and overlapping between coils and spreading the magnetic flux distribution of the coils to the outside, and can also reduce the flux concentrated in the intermediate legs (CL1b, CL2b) and reduce the overall magnetic flux distribution.

[0109] Fig. 13 is an exploded perspective view of a transformer according to a fourth embodiment of the present invention, Fig. 14 is a plan view of Fig. 13, and Fig. 15 is a cross-section of Fig. 13 taken in the same direction as Fig. 3.

[0110] Referring to FIGS. 13 to 15, a transformer according to a fourth embodiment of the present invention may include a core portion (100c) and a coil portion (200).

[0111] Since the core part (100c) and coil part (200) have been sufficiently described in detail in FIGS. 1 to 3, the description will focus on the changed parts here.

[0112] The core portion (100c) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (100c) can include an upper core (110c) coupled from the upper side and a lower core (120c) coupled from the lower side.

[0113] Each of the upper core (110c) and the lower core (120c) may include a body portion in the form of a flat plate and a plurality of leg portions (OL1, OL2, OL3, OL4, CL1c, CL2c) protruding from the body portion in the thickness direction (i.e., the z-axis direction or the third direction) and extending along a predetermined direction.

[0114] For example, the plurality of leg portions (OL1, OL2, CL1c) of the upper core (110c) may extend along the major axis (here, the y-axis or the second direction) direction on a plane and may include two outer legs (OL1, OL2) spaced apart from each other along the minor axis (here, the X-axis or the first direction) direction, and one middle leg (CL1c) arranged between the two outer legs (OL1, OL2).

[0115] When the upper core (110c) and the lower core (120c) are connected vertically, each of the outer legs (OL1, OL2) and the middle leg (CL1c) of the upper core (110c) can face the corresponding outer legs (OL3, OL4) or middle leg (CL2c) of the lower core (120c).

[0116] For example, the pair of extremities (OL1, OL3) that are opposed to each other can be called the first extremity, the pair of extremities (OL2, OL4) that are opposed to each other can be called the second extremity, and the pair of intermediate feet (CL1b, CL2b) can be called the intermediate feet.

[0117] At this time, one metatarsal pair (CL1c, CL2c) may have an elliptical shape in the cross-section cut along the third direction, as illustrated in Fig. 10, but may also have a fillet shape. Accordingly, one metatarsal pair (CL1c, CL2c) may include at least one side (SU, SD, SR, SL) having a predetermined R value.

[0118] The first separation distance (d41) between the first coil (210) and the intermediate legs (CL1c, CL2c) can be formed longer than the second separation distance (d42) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4).

[0119] The following description is omitted as it has been sufficiently explained in FIGS. 1 to 3.

[0120] Figure 16 is a diagram for explaining simulation results according to the fourth embodiment.

[0121] Fig. 16 (a) is a simulation result based on a cross-section of Fig. 13 cut in the same direction as Fig. 3, and Fig. 16 (b) is a simulation result based on a plan view of a transformer according to the fourth embodiment.

[0122] For example, the more red it goes (440), the more severe the fever is, and the more blue it goes (442), the less severe the fever is.

[0123] As illustrated in (a) and (b) of FIG. 16, the present invention can form the first separation distance (d41) between the first coil (210) and the intermediate legs (CL1c, CL2c) to be longer than the second separation distance (d42) between the second coil (220) and the two outer pairs (OL1, OL2, OL3, OL4) in order to place the first coil outside the high magnetic flux distribution range due to the fringing effect. In addition, the present invention can include at least one side (SU, SD, SR, SL) having a predetermined R value in the shape of the intermediate legs (CL1c, CL2c) in order to reduce the fringing flux generated in the intermediate legs (CL1c, CL2c).

[0124] Accordingly, the present invention can improve heat generation by preventing the flow of magnetic flux due to the fringing effect around the intermediate legs (CL1c, CL2c) and overlapping between coils and spreading the magnetic flux distribution of the coils to the outside, and can also reduce the flux concentrated in the intermediate legs (CL1c, CL2c) and reduce the overall magnetic flux distribution.

[0125] Although the above has been described with reference to 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.

[0126] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0127] The transformer of the embodiment can be used in a power supply unit of an electronic device, etc.

Claims

1. Core section including an upper core and a lower core; A coil portion at least partially disposed within the core portion; The above core part, Including a first extremity, a second extremity, and a middle extremity positioned between the first extremity and the second extremity, The above coil part, A first coil disposed adjacent to the above-mentioned intermediate leg and a second coil disposed adjacent to the first outer leg and the second outer leg, The first separation distance between the first coil and the intermediate leg is A transformer longer than the second separation distance between the first outer coil and the second coil.

2. In paragraph 1, The above first separation distance is, The gap between the inner edge of the first coil and the edge of the middle leg, The above second separation distance is, A transformer, wherein the gap is between the outer edge of the second coil and the edge of the first outer group, or the gap is between the outer edge of the second coil and the edge of the second outer group.

3. In paragraph 1, The first coil and the second coil, A transformer in which a portion is disposed between the first outer leg and the middle leg and between the middle leg and the second outer leg, and the outer edge of the first coil and the inner edge of the second coil are spaced apart from each other in a first direction on a plane.

4. In paragraph 2, The above second coil, A transformer, wherein the first coil is positioned closer to the first outer group and the second outer group than to the first coil in the first direction on the plane.

5. In paragraph 2, The above first separation distance is, Transformer of 5mm or more and 7mm or less.

6. In paragraph 1, At least one of the first coil and the second coil, A transformer formed into a predetermined pattern shape.

7. In paragraph 1, The protrusion length of the above-mentioned midfoot protruding in the third direction vertically is A transformer, wherein the protrusion length of the first outer leg protruding in the third direction is shorter than the protrusion length of the second outer leg.

8. In paragraph 7, A transformer, wherein a gap of a predetermined distance is formed between at least a portion of the first outer group of the upper core and the first outer group of the lower core, the second outer group of the upper core and the second outer group of the lower core, and the middle group of the upper core and the middle group of the lower core, which are opposed to each other.

9. In paragraph 1, A transformer in which the width of the above-mentioned intermediate leg is formed longer than the width of the first outer leg or the width of the second outer leg.

10. In paragraph 1, The above-mentioned intermediate member is a transformer having an elliptical plane shape.

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