Transformer and display device

Abstract

A transformer of one embodiment may include: a core portion including two outer leg portions and a middle leg portion disposed between the two outer leg portions; and a coil portion including a primary coil portion and a secondary coil portion, a portion of the primary coil portion and a portion of the secondary coil portion being disposed in the core portion, in which: at least a portion of the secondary coil portion is disposed between the two outer leg portions and the primary coil portion in the first direction; a short axis portion of the primary coil portion is arranged to be spaced apart from the middle leg by a predetermined first distance in a second direction intersecting the first direction; a long axis portion of the primary coil portion is arranged to be spaced apart from the middle leg portion by a predetermined second distance in the first direction; the first distance is greater than the second distance.

Description

Technical Field

[0001] The present disclosure relates to a transformer and a display device. Background Art

[0002] The transformer is used in a power supply unit of an electronic device (e.g., a display device).

[0003] Recently, as display devices become larger and thinner, there is a demand for miniaturization of the power supply unit while maintaining high power density and high efficiency characteristics.

[0004] As the switching frequency increases, the transformer can be miniaturized; however, the miniaturization of the transformer results in a reduction in the heat dissipation area, which causes losses in the coils and cores of the transformer and increases the heat generation amount. For example, when driving the transformer at a frequency of 100 kHz or higher, the skin effect and proximity effect increase the losses in the coils and cores of the transformer, thereby increasing the heat generation in the coils and cores.

[0005] Meanwhile, a conventional transformer is configured such that a primary coil is wound around a core to prevent a gap from being formed in a plane between the primary coil and the core.

[0006] This winding structure of the primary coil in the conventional transformer causes the heat generated in the primary coil to be diffused to the core, thereby increasing the heat generation, and also makes it difficult for the heat to be effectively dissipated to the outside.

[0007] In addition, in the conventional transformer, insulation breakdown occurs due to failure to ensure a sufficient insulation distance between the primary coil and the core.

[0008] Furthermore, in the conventional transformer, overcurrent occurs in the primary coil in contact with the short axis portion (e.g., circular portion) of the core, resulting in insulation breakdown.

[0009] Moreover, in the conventional transformer, noise is generated due to the vibration of the primary coil caused by current flow. Summary of the Invention Technical Problem

[0010] The present disclosure provides a transformer having a new structure, which can be miniaturized while solving the above problems related to heat generation, insulation breakdown, and noise generation associated with the conventional transformer.

[0011] The technical tasks of the present disclosure are not limited to the above technical tasks, and those skilled in the art will clearly understand other technical tasks not mentioned herein from the following description. Technical Solution

[0012] A transformer according to an embodiment may include: a core unit including two outer legs and a central leg disposed between the two outer legs; and a coil unit including a primary coil unit and a secondary coil unit, with a part of the primary coil unit and a part of the secondary coil unit disposed inside the core unit, wherein at least a part of the secondary coil unit may be disposed between the two outer legs and the primary coil unit in a first direction, the primary coil unit may include a short-axis part spaced apart from the central leg by a predetermined first distance in a second direction intersecting the first direction, the primary coil unit may include a long-axis part spaced apart from the central leg by a predetermined second distance in the first direction, and the first distance may be greater than the second distance.

[0013] The length of the long-axis part of the central leg may be less than the length of the long-axis part of the core unit, and the short-axis part of the central leg may have a first width. The first distance may be in the range of 0.5 times to 1 time the first width.

[0014] The second distance may be in the range of 0.45 times to 0.145 times the first width.

[0015] The minimum spacing distance between any one of the two outer legs and the secondary coil unit may be set to a predetermined third distance, and the third distance may be less than the first distance and greater than the second distance.

[0016] The third distance may be in the range of 0.145 times to 0.205 times the first width.

[0017] The primary coil unit may include a helically wound coil, and the secondary coil unit may include a first plate and a second plate. The second plate may be disposed on the first plate in a third direction intersecting the first direction and the second direction.

[0018] Each of the first plate and the second plate may form an open turn in the first direction and the second direction. One end of each of the first plate and the second plate may include a first bent portion and a second bent portion connected to the first bent portion, and the other end of each of the first plate and the second plate may include a third bent portion and a fourth bent portion connected to the third bent portion.

[0019] Terminal portions may be disposed at the ends of the second bent portions of each of the first plate and the second plate, and terminal portions may be disposed at the ends of the fourth bent portions of each of the first plate and the second plate.

[0020] The transformer may further include a bobbin disposed inside the core unit, and the bobbin may be disposed between the primary coil unit and the two outer legs.

[0021] The display device according to an embodiment may include a circuit board on which a transformer is provided. Advantageous Effects

[0022] The transformer according to an embodiment of the present disclosure may alleviate the heat generation problem of a conventional transformer and may ensure an insulation distance between a coil unit and a core unit of the transformer, thereby improving insulation performance and increasing the withstand voltage of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view showing an exemplary configuration of a transformer according to an embodiment.

[0024] Figure 2 is a plan view showing an exemplary configuration of a transformer according to an embodiment in Figure 1 ...

[0025] Figure 3 is a plan view showing an exemplary configuration of a transformer according to an embodiment in Figure 1 ...

[0026] Figure 4 is a perspective view showing the rear surface of a transformer according to an embodiment in Figure 1 ...

[0027] Figure 5 is a view showing a first side surface of an exemplary configuration of a transformer according to an embodiment in Figure 1 ...

[0028] Figure 6 is a view showing a second side surface of an exemplary configuration of a transformer according to an embodiment in Figure 1 ...

[0029] Figure 7 is a view showing a transformer according to an embodiment.

[0030] Figure 8 is a view for explaining an interval distance between components of a transformer on a plane according to an embodiment.

[0031] Figure 9 is a view for explaining an interval distance between components of a transformer on a plane according to an embodiment.

[0032] Figure 10 is a view showing an example of the shape of a central leg of a core unit according to an embodiment. DETAILED DESCRIPTION

[0033] The present disclosure may be variously modified and have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present disclosure to the specific embodiments, but should be understood to include all variations, equivalents, or alternatives included in the spirit and technical scope of the present disclosure.

[0034] The suffixes “module” and “unit” used in this specification are only for naming distinctions between components and should not be construed as assuming that the terms are physically and chemically distinguishable or separable or can be distinguished or separated in that manner.

[0035] Although terms including ordinal numbers (such as “first”, “second”, etc.) may be used herein to describe various components, the components are not limited by these terms. These terms are only used to distinguish one component from another.

[0036] The term “and / or” is used to include any combination of a plurality of items as the subject. For example, “A and / or B” inclusively represents all three cases, such as “A”, “B”, and “A and B”.

[0037] It should be understood that when a component is referred to as being “connected to” or “coupled to” another component, it may be directly connected to or coupled to the other component, or there may be an intermediate component.

[0038] In the description of the embodiments, it should be understood that when an element such as a layer (film), region, pattern, or structure is referred to as being “on” or “under” another element such as a substrate, layer (film), region, pad, or pattern, the terms “on” or “under” mean that the element is directly on or under the other element, or is formed such that there may also be an intermediate element. Additionally, it should also be understood that the criteria of “on...” or “under...” are for convenience based on the drawings, unless otherwise defined due to the characteristics of each component or their relationship. The terms “on” or “under” are only used to indicate the relative positional relationship between components and should not be construed as limiting the actual position of the components. For example, the phrase “B is on A” only indicates that B is shown in the drawing as being located on A, unless otherwise defined or unless due to the characteristics of A or B, A must be located on B. In an actual product, B may be located below A, or B and A may be arranged in a left - right direction.

[0039] In addition, the thickness or size of the layer (film), region, pattern, or structure shown in the drawings may be exaggerated, omitted, or schematically shown for clarity and convenience of illustration, and may not accurately reflect the actual size.

[0040] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the exemplary embodiments of the present disclosure. As used herein, the singular forms are also intended to include the plural forms unless the context clearly dictates otherwise. It will be further understood that when used herein, the terms "comprises" or "has" specify the presence of the stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0041] Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the context of the relevant art, and unless explicitly defined herein, terms should not be interpreted as having an ideal or overly formal meaning.

[0042] In addition, considering that the transformer related to the embodiment is mounted on the circuit board of the display device, the thickness (or vertical height) of the transformer according to the present disclosure for contributing to the thinning of the display device may be 14 mm or less, more specifically 12 mm or less, and even more specifically 10 mm or less from the upper surface of the circuit board.

[0043] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0044] Figure 1 is a perspective view showing an exemplary configuration of a transformer according to an embodiment. Figure 2 is a plan view showing an exemplary configuration of a transformer according to the embodiment in Figure 1 is a plan view showing an exemplary configuration of a transformer according to the embodiment in Figure 3 is a perspective view showing the rear surface of a transformer according to the embodiment in Figure 1 is a plan view showing the rear surface of a transformer according to the embodiment in Figure 4 is a perspective view showing the rear surface of a transformer according to the embodiment in Figure 1 is a plan view showing the rear surface of a transformer according to the embodiment in Figure 5 is a view (e.g., a side view in the x-axis direction on the x-y plane) showing a first side surface of an exemplary configuration of a transformer according to the embodiment in Figure 1 is a view (e.g., a side view in the y-axis direction on the x-y plane) showing a second side surface of an exemplary configuration of a transformer according to the embodiment in Figure 6 is a perspective view showing the rear surface of a transformer according to the embodiment in Figure 1 is a view (e.g., a side view in the y-axis direction on the x-y plane) showing a second side surface of an exemplary configuration of a transformer according to the embodiment in

[0045] Referring to Figures 1 to 6 , the transformer 100 may include a core unit 110 and coil units 120 and 130.

[0046] The core unit 110 may have the characteristics of a magnetic circuit and may be used as a path for magnetic flux.

[0047] The core unit 110 may be disposed at the lower side of the transformer 100.

[0048] The core unit 110 may include: a body portion having a planar shape; and a plurality of legs 111, 113, and 115 that protrude from the body portion in the thickness direction (e.g., the z-axis direction) and extend in a predetermined direction. The plurality of legs 111, 113, and 115 may include: two outer legs 111 and 113 that extend in one axial direction (e.g., the y-axis direction) on a plane and are spaced apart from each other in another axial direction (e.g., the x-axis direction); and a center leg 115 disposed between the two outer legs 111 and 113.

[0049] The coil units 120 and 130 may include a primary coil unit 120 and a secondary coil unit 130.

[0050] The primary coil unit 120 may include a coil. Hereinafter, the primary coil unit 120 may also be referred to as the coil 120.

[0051] For example, the wire of the coil 120 may be formed as an enameled wire wound with fiber yarn (USTC wire), Litz wire, triple-insulated wire (TIW), or triple-insulated Litz wire.

[0052] The coil 120 may be in the form of a winding wound in a spiral for one or more turns.

[0053] The coil 120 may be disposed on a part of the upper end of the body portion of the core unit 110 so as to be disposed between the center leg 115 of the core unit 110 and the secondary coil unit 130 on a plane (e.g., the x–y axis plane).

[0054] The secondary coil unit 130 may include a first plate 131 and a second plate 133 having a planar shape.

[0055] For example, the first plate 131 and the second plate 133 may include a conductive metal (e.g., copper or aluminum).

[0056] The first plate 131 and the second plate 133 may have a planar shape that is laterally symmetric with each other on a plane (e.g., the x-y axis plane).

[0057] For example, the first plate 131 may form an open turn on a plane (e.g., the x-y axis plane). One end of the first plate 131 may include a first bending portion 1311 and a second bending portion 1313, and the other end thereof may include a third bending portion 1315 and a fourth bending portion 1317.

[0058] The second bending portion 1313 and the fourth bending portion 1317 can be bent at a first angle and can extend toward the outer leg 113 in a plane (e.g., the x-y axis plane).

[0059] The terminal portion TM1 can be provided at the end of the second bending portion 1313. Additionally, the terminal portion TM2 can be provided at the end of the fourth bending portion 1317.

[0060] Furthermore, the second plate 133 can form an open turn in a plane (e.g., the x-y axis plane). One end of the second plate 133 can include a first bending portion 1331 and a second bending portion 1333, and the other end thereof can include a third bending portion 1335 and a fourth bending portion 1337.

[0061] The second bending portion 1333 and the fourth bending portion 1337 can be bent at a second angle and can extend toward the outer leg 111 in a plane (e.g., the x-y axis plane). For example, the second angle can differ from the first angle by 180 degrees.

[0062] The terminal portion TM4 can be provided at the end of the second bending portion 1333. Additionally, the terminal portion TM3 can be provided at the end of the fourth bending portion 1337.

[0063] The secondary coil unit 130 (i.e., the first plate 131 and the second plate 133) can be provided on a part of the upper end of the body portion of the core unit 110 so as to be disposed between the two outer legs 111 and 113 of the core unit 110 and the coil 120 in a plane (e.g., the x-y axis plane).

[0064] The first plate 131 and the second plate 133 can be aligned and stacked with respect to the central leg 115 of the core unit 110.

[0065] For example, the first plate 131 and the second plate 133 can be arranged such that the central leg 115 is located at the center of the turns of each of the first plate 131 and the second plate 133 in a plane (e.g., the x-y axis plane). In addition, the first plate 131 can be provided on the upper end of the body portion of the core unit 110, and the second plate 133 can be provided on the upper end of the first plate 131.

[0066] For example, refer to Figures 1 to 6, when the core unit 110 has a first length in one axial direction (e.g., the y-axis direction) and a second length in another axial direction (e.g., the x-axis direction) on a plane (e.g., the x-y axis plane), the maximum length of the coil 120 in one axial direction on the plane can be a third length greater than the first length, and the maximum length of the coil 120 in the other axial direction on the plane can be a fourth length less than the second length. Additionally, the maximum length of the secondary coil unit 130 (i.e., the first plate 131 and the second plate 133) in one axial direction (e.g., the y-axis direction) on the plane can be a fifth length greater than the third length, and the maximum length of the secondary coil unit 130 in the other axial direction (e.g., the x-axis direction) on the plane can be a sixth length less than the second length and greater than the fourth length.

[0067] Figure 7 is a view showing a transformer according to an embodiment.

[0068] Reference Figure 7 , in addition to Figures 1 to 6 the above-described embodiment shown, the transformer 100 may further include a bobbin 70.

[0069] For example, the bobbin 70 may be disposed between the outer legs 111 and 113 of the core unit 110 and the coil 120 on a plane (e.g., the x-y axis plane).

[0070] Meanwhile, although not shown, in addition to the above-described embodiment, an insulating layer (not shown) may be disposed between the first plate 131 and the second plate 133. For example, the insulating layer may include at least one material selected from ketones, polyimide-based materials, polyethylene terephthalate (PET), silicone, and epoxy-based materials.

[0071] Meanwhile, although not shown, in addition to Figures 1 to 7 the above-described embodiment shown, the transformer 100 may further include a core unit (not shown) disposed at the upper side of the transformer 100. For example, the core unit 110 disposed at the lower side and the core unit disposed at the upper side may be vertically symmetric or asymmetric with each other.

[0072] According to Figures 1 to 7 the embodiment shown in, the transformer 100 can provide a structure that minimizes the contact area between the core unit 110 and the coil units 120 and 130.

[0073] This structure of the transformer 100 that minimizes the contact area between the core unit 110 and the coil units 120 and 130 can solve the problem of increased heat generation in conventional transformers, where the heat generated in the coil unit diffuses to the core unit due to the overlap between the core unit and the coil unit. In addition, according to the structure of the transformer 100 that minimizes the contact area between the core unit 110 and the coil units 120 and 130, the transformer 100 according to an embodiment of the present disclosure can improve the withstand voltage of the transformer compared to conventional transformers.

[0074] Hereinafter, reference will be made to Figure 8 and Figure 9 describe an example of the structure of the transformer 100 for minimizing the contact area between the core unit 110 and the coil units 120 and 130.

[0075] Figure 8 is a view for illustrating the spacing distances between the components of the transformer 100 in a plane (e.g., the x - y axis plane) according to an embodiment. Figure 9 is a view for illustrating the spacing distances between the components of the transformer 100 in a plane (e.g., the x - y axis plane) according to an embodiment.

[0076] Referring to Figure 8 , the coil 120 may be in the form of a winding helically wound around the central leg 115 of the core unit 110 in a plane (e.g., the x - y axis plane), and may be spaced apart from the central leg 115 by a predetermined distance 71 and 73 in the plane (e.g., the x - y axis plane). For example, the coil 120 may be disposed on a part of the upper end of the body portion of the core unit 110 such that the inner portion of the coil 120 formed in a winding shape and the central leg 115 (or the outer portion of the central leg 115) are spaced apart from each other by a predetermined distance 71 and 73.

[0077] For example, the predetermined distances 71 and 73 between the coil 120 and the central leg 115 may include a predetermined first distance 71 between the coil 120 and the short - axis portion (also referred to as the circular portion) of the central leg 115 and a predetermined second distance 73 between the coil 120 and the long - axis portion of the central leg 115.

[0078] For example, the first distance 71 may be greater than the second distance 73.

[0079] In addition, the secondary coil units 131 and 133 may be disposed on the upper end of the body portion of the core unit 110 such that each of the outer legs 111 and 113 is spaced apart from the secondary coil units 131 and 133 by a predetermined third distance 75 in a plane (e.g., the x - y axis plane).

[0080] For example, a first plate 131 and a second plate 133, in which open turns are formed on a plane (e.g., the x-y axis plane), may be disposed on a part of the upper end of the body portion of the core unit 110 such that the outside of the turns of the first plate 131 and the second plate 133 is spaced apart from each outer leg 111 and 113 (or the inside of each outer leg 111 and 113) of the core unit 110 by a predetermined third distance 75.

[0081] When a short-axis portion of the coil has a cornered geometry, it becomes vulnerable in terms of withstand voltage. Therefore, the short-axis portion of the coil 120 has a circular geometry, which is not easily damaged in terms of withstand voltage. However, the circular portion exhibits greater heat generation than other portions. To solve this problem, according to the present disclosure, the coil 120 may be disposed on a part of the upper end of the body portion of the core unit 110 such that the coil 120 is spaced apart from the short-axis portion (also referred to as the circular portion) of the central leg 115 by a predetermined first distance 71.

[0082] Furthermore, according to the manufacturing process, in a state where the dimension of the core in another axial direction (e.g., the x-axis direction) on a plane (e.g., the x-y axis plane) is specified as a predetermined value, the core unit 110 and the coil units 120 and 130 may be spaced apart from each other by the maximum possible distance. That is, the long-axis portions of the coil 120 and the central leg 115 may be spaced apart by a predetermined second distance 73, and the secondary coil unit 130 and the outer legs 111 and 113 may be spaced apart by a predetermined second distance 73.

[0083] Reference Figure 9 may be used to determine the spacing distance between the central leg 115 of the core unit 110 and the coil 120 based on the dimension of the central leg 115 of the core unit 110.

[0084] For example, the predetermined first distance 71 between the coil 120 and the short-axis portion (also referred to as the circular portion) of the central leg 115 of the core unit 110 may be in the range of 0.5 times to 1 time the diameter (also referred to as the width) 81 of the short-axis portion of the central leg 115.

[0085] In addition, the predetermined second distance 73 between the coil 120 and the long-axis portion of the central leg 115 of the core unit 110 may be in the range of 0.045 times to 0.145 times the diameter 81 of the short-axis portion of the central leg 115.

[0086] In addition, the distance between the outer portions of the turns of the first plate 131 and the second plate 133 and each outer leg 111 and 113 of the core unit 110 (i.e., the predetermined third distance 75) may be in the range of 0.145 times to 0.205 times the diameter 81 of the short-axis portion of the central leg 115.

[0087] For example, when the diameter 81 of the short-axis portion of the central leg on a plane (e.g., the x-y axis plane) is 11 mm, the predetermined first distance 71 can be any value within the range of 5.5 mm to 11 mm, and the predetermined second distance 71 can be any value within the range of 0.5 mm to 1.6 mm.

[0088] As in Figures 1 to 9 In the above-described embodiment shown in, when the coil 120 and the central leg 115 of the core unit 110 are spaced apart by a predetermined distance, the contact area between the coil 120 and the core unit 110 can be minimized, thereby contributing to dissipating the heat generated by the losses in the coil 120 and the core unit 110, and thus alleviating the heat generation problem of the conventional transformer.

[0089] In addition, as in Figures 1 to 9 In the above-described embodiment shown in, when the coil 120 and the central leg 115 of the core unit 110 are spaced apart by a predetermined distance, the insulation distance between the coil 120 and the core unit 110 can be ensured, thereby improving the insulation performance and increasing the withstand voltage, as shown in Table 1 below.

[0090] Table 1 shows the measured withstand voltage data for a conventional transformer and the transformer 100 manufactured according to the above-described embodiment of the present disclosure. In the conventional transformer, no distance is provided between the central leg 115 of the core unit 110 and the primary coil unit 120.

[0091] [Table 1]

[0092] In addition, compared with the conventional transformer, the transformer 100 according to the above-described embodiment can have the effect of reducing the noise caused by vibration. For example, generally, when the transformer operates, noise is generated as the coil 120 and the core unit 110 vibrate. However, since the contact area between the coil 120 and the core unit 110 is reduced compared with the conventional transformer, the transformer 100 according to the above-described embodiment can have the effect of reducing the noise caused by vibration.

[0093] In addition, according to the above-described embodiment, since the central legs 115 of the coil 120 and the core unit 110 are spaced apart by a predetermined distance, the degree of freedom in the shape of the central leg of the core unit 110 can also be ensured. For example, central legs having various shapes can be realized, as Figure 10 shown.

[0094] Figure 10 is a view showing an example of the shape of the central leg of the core unit according to an embodiment.

[0095] Refer to Figure 10, the shape of the central leg 115 of the core unit 110 can be formed into an octagonal shape, as shown in Figure 10 (a). Additionally, the shape of the central leg 115 of the core unit 110 can be formed into a circle 115, as shown in Figure 10 (b).

[0096] Although the present disclosure has been specifically shown and described with reference to exemplary embodiments thereof, these embodiments are presented for illustrative purposes only and do not limit the present disclosure, and it will be apparent to those skilled in the art that various changes may be made in form and detail without departing from the basic characteristics of the embodiments set forth herein. For example, the corresponding configurations set forth in the embodiments may be modified and applied. Additionally, the differences in these modifications and applications should be construed as falling within the scope of the present disclosure as defined by the appended claims. Publication mode

[0097] Various embodiments have been described in the best mode for carrying out the present disclosure. Industrial applicability

[0098] The transformer and the display device according to the embodiments can be used in the power supply unit of an electronic device (e.g., a display device).

Claims

1. A transformer, comprising: a core unit including two outer legs and a central leg disposed between the two outer legs; and a coil unit including a primary coil unit and a secondary coil unit, with a part of the primary coil unit and a part of the secondary coil unit disposed inside the core unit, wherein at least a part of the secondary coil unit is disposed between the two outer legs and the primary coil unit in a first direction, wherein the primary coil unit includes a short-axis part that is spaced apart from the central leg by a predetermined first distance in a second direction intersecting the first direction, wherein the primary coil unit includes a long-axis part that is spaced apart from the central leg by a predetermined second distance in the first direction, and wherein the first distance is greater than the second distance.

2. The transformer according to claim 1, wherein, The length of the long-axis part of the central leg is less than the length of the long-axis part of the core unit, wherein the short-axis part of the central leg has a first width, and wherein the first distance is in the range of 0.5 times to 1 time the first width.

3. The transformer according to claim 2, wherein, The second distance is in the range of 0.45 times to 0.145 times the first width.

4. The transformer according to claim 3, wherein, The minimum spacing distance between any one of the two outer legs and the secondary coil unit is set to a predetermined third distance, and wherein the third distance is less than the first distance and greater than the second distance.

5. The transformer according to claim 4, wherein, The third distance is in the range of 0.145 times to 0.205 times the first width.

6. The transformer according to claim 1, wherein, The primary coil unit includes a helically wound coil, wherein the secondary coil unit includes a first plate and a second plate, and wherein the second plate is disposed on the first plate in a third direction intersecting the first direction and the second direction.

7. The transformer according to claim 6, wherein, Each of the first plate and the second plate forms an open turn in the first direction and the second direction, and wherein one end of each of the first plate and the second plate includes a first bent portion and a second bent portion connected to the first bent portion, and the other end of each of the first plate and the second plate includes a third bent portion and a fourth bent portion connected to the third bent portion.

8. The transformer according to claim 7, wherein, Terminal portions are disposed at the ends of the second bent portions of each of the first plate and the second plate, and wherein terminal portions are disposed at the ends of the fourth bent portions of each of the first plate and the second plate.

9. The transformer according to claim 1, further comprising a bobbin disposed inside the core unit, Among them, wherein the bobbin is disposed between the primary coil unit and the two outer legs.

10. A display device, comprising: the transformer according to claims 1 to 9; and a circuit board on which the transformer is disposed.

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