High density and high efficiency transformer

Abstract

Provided in an embodiment is a high density and high efficiency transformer comprising: a core; a bobbin inserted into the core; a plurality of conductive plates coupled to the bobbin; and a connector positioned between the plurality of conductive plates, wherein: the bobbin includes a winding part, and a lower flange and an upper flange provided on both sides of the winding part; the winding part includes first and second winding parts; the first winding part has a plurality of insertion grooves spaced apart from each other along the outer circumferential surface; the second winding part is inserted into each of the plurality of insertion grooves so as to surround the first winding part, and both ends thereof protrude to the outside of the first winding part; and the plurality of conductive plates are inserted into each of the plurality of insertion grooves so as to surround the second winding part, and both ends thereof protrude to the outside of the first winding part.

Description

High-density and high-efficiency transformers

[0001] The present invention relates to a high-density and high-efficiency transformer.

[0002] Recently, factors such as functionality, design, and miniaturization of electrical and electronic devices are increasingly playing a crucial role in product sales. Consequently, the importance of power supplies, which serve as the heart of electrical and electronic products, is growing even more critical. Driven by the growing demand for high-density, high-efficiency, and high-reliability, miniaturized and lightweight power modules are becoming increasingly important. Consequently, transformers, which occupy a significant portion of the power module's volume and play a crucial role in power conversion, are also demanding high-density and high-efficiency performance. Minimizing transformer leakage current is paramount to increasing transformer density and efficiency.

[0003] The present invention provides a transformer that improves efficiency by reducing leakage inductance.

[0004] In addition, the present invention can propose a structure of a transformer that enables miniaturization of the transformer and high output.

[0005] An embodiment can provide a high-density and high-efficiency transformer including a core; a bobbin inserted into the core; a plurality of conductive plates coupled to the bobbin; and a connector positioned between the plurality of conductive plates, wherein the bobbin includes a winding portion and a lower flange and an upper flange provided on both sides of the winding portion, the winding portion includes first and second winding portions, the first winding portion has a plurality of insertion grooves formed spaced apart from each other along an outer circumference thereof, the second winding portion is inserted into each of the plurality of insertion grooves to surround the first winding portion and both ends protrude outwardly of the first winding portion, and the plurality of conductive plates are inserted into each of the plurality of insertion grooves to surround the second winding portion and both ends protrude outwardly of the first winding portion.

[0006] In another aspect, the first and second winding sections can provide a high-density and high-efficiency transformer formed integrally.

[0007] In another aspect, a high-density and high-efficiency transformer can be provided in which a coil is wound in the area between the plurality of conductive plates.

[0008] In another aspect, the second winding section can provide a high-density and high-efficiency transformer having a U-shape.

[0009] In another aspect, the plurality of conductive plates can provide a high-density and high-efficiency transformer having a U-shape.

[0010] In another aspect, the connector may provide a high-density and high-efficiency transformer including a connector plate, a first bent portion bent on one side of the connector plate, and a second bent portion bent on the other side of the connector plate, wherein the first bent portion faces a portion of the plurality of conductive plates, and the second bent portion faces the remainder of the plurality of conductive plates.

[0011] In another aspect, the connector may be configured with a plurality of connectors, each of the plurality of connectors including a connector bar, a first bent portion bent from one side of the connector bar, and a second bent portion bent from the other side of the connector bar, and in any connector of the plurality of connectors, the first bent portion faces one of the plurality of conductive plates, and the second bent portion faces the other of the plurality of conductive plates, thereby providing a high-density and high-efficiency transformer.

[0012] The embodiment provides a transformer with a new structure applied thereto, thereby increasing the coupling between the primary and secondary sections and maximizing efficiency by reducing leakage inductance.

[0013] In addition, the embodiment can solve the problem of increasing the size of the transformer to increase the efficiency of the power module by reducing the temperature and core loss of the transformer by increasing the coupling between the primary and secondary of the transformer to reduce leakage inductance, and can maximize efficiency in a given space and size by maintaining the miniaturization of the transformer.

[0014] Instead of increasing the size of the transformer to reduce the temperature and core loss of the transformer to increase the efficiency of the power module,

[0015] In addition, the embodiment can provide a transformer in which the conductive plates as the secondary side are subdivided into a parallel structure and the primary side winding is formed between the conductive plates to increase the coupling coefficient between the primary and secondary parts and reduce leakage inductance.

[0016] In addition, the embodiment can provide a transformer in which a conductive plate as a secondary side is configured with multiple layers to reduce leakage inductance.

[0017] FIG. 1a is a perspective view of a high-density and high-efficiency transformer according to an embodiment of the present invention.

[0018] Figure 1b is an exploded perspective view of a high-density and high-efficiency transformer according to an embodiment of the present invention.

[0019] Figures 2 to 7 are views of the bobbin constituting an embodiment of the present invention from various angles.

[0020] Figure 8 is an exploded perspective view of the core and bobbin.

[0021] Figures 9 and 10 are views of the core constituting an embodiment of the present invention from various angles.

[0022] Fig. 11 is a perspective view of a conductive plate constituting an embodiment of the present invention.

[0023] Figure 12 illustrates the conductive plate being coupled to the bobbin.

[0024] Figure 13 illustrates a conductive plate attached to a bobbin on a core.

[0025] Fig. 14 is a perspective view of a connector constituting an embodiment of the present invention.

[0026] Figure 15 illustrates a connector installed on a core.

[0027] Figure 16 is a perspective view of a cover constituting an embodiment of the present invention.

[0028] Figure 17 illustrates a connector being fastened to a conductive plate on a core.

[0029] Figure 18 is an exploded perspective view of a portion of a high-density and high-efficiency transformer according to another embodiment of the present invention.

[0030] Figure 19 is a perspective view of a connector constituting another embodiment of the present invention.

[0031] Figure 20 illustrates a state in which a connector is installed within a core.

[0032] The present invention is capable of various modifications and embodiments. Therefore, specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, as well as the methods for achieving them, will become clear with reference to the embodiments described in detail below together with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms. In the following embodiments, the terms "first," "second," etc. are not used in a limiting sense but are used for the purpose of distinguishing one component from another. Furthermore, the singular expression includes the plural expression unless the context clearly indicates otherwise. Furthermore, terms such as "include" or "have" indicate the presence of a feature or component described in the specification, and do not preemptively exclude the possibility that one or more other features or components may be added. Furthermore, in the drawings, the sizes of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to what is shown.

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals and redundant descriptions thereof will be omitted.

[0034] The efficiency of a transformer is closely related to the coupling coefficient between coils. In this case, when two coils, each with its own inductance L1 and L2, are coupled with a mutual inductance M, the coupling coefficient K is , and the synthetic inductance L can be expressed as L = L1 +L2 +2M. Generally, the coupling coefficient K has a value less than 1, but in the ideal case of perfect coupling, the coupling coefficient becomes 1. Therefore, by improving the mutual inductive coupling between the primary and secondary sides, the coupling coefficient can be increased to the maximum, thereby improving the energy efficiency of the transformer.

[0035] - Transformers

[0036] FIG. 1a is a perspective view of a high-density and high-efficiency transformer according to an embodiment of the present invention, and FIG. 1b is an exploded perspective view of a high-density and high-efficiency transformer according to an embodiment of the present invention.

[0037] Referring to FIGS. 1A and 1B, a high-density and high-efficiency transformer (1) according to an embodiment of the present invention may include a core (10), a bobbin (20), a conductive plate (30), a connector (40), and a cover (50).

[0038] A bobbin (20) is fastened to the core (10), and then a conductive plate (30) is fastened and fastened to the bobbin (20) within the core (10), and a connector (40) and a cover (50) are fastened to each other so that they can be coupled to the core (10).

[0039] - Bobbin

[0040] Figures 2 to 7 are views of the bobbin constituting an embodiment of the present invention from various angles.

[0041] Referring to FIGS. 2 to 7, a bobbin (20) constituting an embodiment of the present invention includes a flange (100) and a winding portion (200), and the flange (100) includes a lower flange (101) and an upper flange (102). The lower flange (101) and the upper flange (102) are positioned opposite each other, and the winding portion (200) is positioned between them and can be formed integrally with the winding portion (200).

[0042] The lower flange (101) may have a rectangular plate shape and a through hole (20h) may be formed in the center. In addition, a lower flange one-side groove (101a) may be formed at a predetermined depth and inserted inwardly horizontally from the surface of the lower flange (101) in a direction toward the through hole (20h) at a predetermined area of ​​the left end of the lower flange (101), and a lower flange other-side groove (101b) may be formed at a predetermined depth and inserted inwardly horizontally from the surface of the lower flange (101) in a direction toward the through hole (20h). Similarly, the upper flange (102) may have a rectangular plate shape and a through hole (20h) may be formed at the center. And, a groove (102a) on one side of the upper flange (102) may be formed at a predetermined depth and inserted inwardly horizontally with the surface of the upper flange (102) in a direction toward the through hole (20h) at a predetermined area of ​​the left end of the upper flange (102), and a groove (102b) on the other side of the upper flange may be formed at a predetermined depth and inserted inwardly horizontally with the surface of the upper flange (102) in a direction toward the through hole (20h) at a predetermined area of ​​the right end of the upper flange (102). In addition, the lower flange (101) and the upper flange (102) may have a symmetrical shape, and the through holes (20h) of each of the lower flange (101) and the upper flange (102) may be configured to form one through hole (20h) together with the through hole penetrating the central area of ​​the winding portion (200).

[0043] The winding part (200) may be composed of a first winding part (210) and a second winding part (220) formed integrally. The first winding part (210) has a cylindrical shape, and one side of the first winding part (210) contacts the lower flange (101), and the other side contacts the upper flange (102). In addition, the first winding part (210) may form one through hole (20h) together with the lower and upper flanges (101, 102).

[0044] On the outer surface of the first winding portion (210), a plurality of insertion grooves (210g) are formed along the periphery of the outer surface of the first winding portion (210) in a direction perpendicular to the imaginary central axis of the through hole (20h), and each of the plurality of insertion grooves (210g) can be spaced apart from the nearest insertion grooves by a predetermined distance. In addition, the first insertion groove is spaced apart from the inner surface of the lower flange (101) by a predetermined distance (the surface facing the upper flange), and the last insertion groove is spaced apart from the inner surface of the upper flange (102) by a predetermined distance (the surface facing the lower flange).

[0045] The plurality of insertion grooves (210g) here may be slots formed in a portion of the outer surface of the first winding portion (210). A conductive plate (30) may be fastened and fixed to these slots.

[0046] The second winding section (220) can be coupled to the first winding section (210). The second winding section (220) can be composed of a plurality of second winding sections (220). For example, the second winding section (220) can be composed of the 2-1 to 2-6 winding sections (220a, 220b, 220c, 220d, 220e, 220f).

[0047] Each of the 2-1 to 2-6 winding sections (220a, 220b, 220c, 220d, 220e, 220f) can be sequentially inserted into a plurality of insertion grooves (210g) in the direction from the lower flange (101) to the upper flange (102). Accordingly, the distance between the most adjacent ones among the 2-1 to 2-6 winding sections (220a, 220b, 220c, 220d, 220e, 220f) can be substantially the same as the distance between the most adjacent insertion grooves.

[0048] The second winding part (220) may have a U-type shape. The second winding part (200) may be inserted toward the first winding part (210) toward the area between the grooves (101b, 102b) on the other side of the lower and upper flanges and may be inserted into the insertion groove (210g) of the first winding part (210). In addition, when the second winding part (220) is coupled to the first winding part (210), both ends of the second winding part (220) may be pulled outward from the area between the grooves (101a, 102a) on the one side of the lower and upper flanges toward the outside of the first winding part (210).

[0049] A first flat surface (fp1) can be formed in a region corresponding between the grooves (101a, 102a) on one side of the lower and upper flanges among the regions of the outer circumference of the first winding portion (210), and a second flat surface (fp2) can be formed together with the second winding portion (220) in a region corresponding between the grooves (101b, 102b) on the other side of the lower and upper flanges among the regions of the outer circumference of the first winding portion (210).

[0050] The flange (100), the first winding portion (210), the second winding portion (220), and the first and second flat surfaces (fp1, fp2) can be formed integrally with each other as described above.

[0051] A predetermined region of the upper outer surface and the lower outer surface of the first winding portion (210) may have a predetermined step difference from the second winding portion (210). That is, any one of the 2-1 to 2-6 winding portions (220a, 220b, 220c, 220d, 220e, 220f) may have a step difference from a predetermined region of the upper outer surface and the lower outer surface of the first winding portion (210), and a predetermined region of the upper outer surface and the lower outer surface of the first winding portion (210) in that region may be configured to protrude further outward than the second winding portion (220).

[0052] - Core

[0053] Figure 8 is an exploded perspective view of the core and bobbin, and Figures 9 and 10 are views of the core constituting an embodiment of the present invention from various angles.

[0054] Referring to FIGS. 8 to 10, a core (10) constituting an embodiment of the present invention may be composed of a magnetic material. The core (10) may be composed of a first core (110) and a second core (120), and may include a core fixing frame (130) surrounding the first and second cores (110, 120) while they are coupled to each other.

[0055] The first core (110) may be composed of a first core side portion (111) facing the lower flange (101), a first core upper portion (112) extending from one side of the first core side portion (111) and vertically bent from the first core side portion (111), a first core lower portion (113) extending from the other side of the first core side portion (111) and vertically bent from the first core side portion (111), and a first core protrusion (114) extending from the central region of the first core side portion (111) to a predetermined length from the inner side of the first core side portion (111) facing the second core side portion (121) toward the inner side of the second core side portion (121).

[0056] The second core (120) may be composed of a second core side portion (121) facing the lower flange (101), a second core upper portion (122) extending from one side of the second core side portion (121) and vertically bent from the second core side portion (121), a second core lower portion (123) extending from the other side of the second core side portion (121) and vertically bent from the second core side portion (121), and a second core protrusion (124) extending from the central region of the second core side portion (121) to a predetermined length from the inner side of the second core side portion (121) facing the first core side portion (111) toward the inner side of the first core side portion (111).

[0057] The first core protrusion (114) is inserted into the through hole (20h) on the lower flange (101), and the second core protrusion (124) is inserted into the through hole (20h) on the upper flange (102), so that the first and second core protrusions (114, 124) come into contact with each other within the through hole (20h). According to various embodiments, the first and second core protrusions (114, 124) can be physically fastened to each other within the through hole (20h). Then, when the first and second cores (110, 120) are fastened to the bobbin (20), the first core upper part (112) and the second core upper part (122) come into contact with each other, and the first core lower part (113) and the second core lower part (123) come into contact with each other. In various embodiments, when the first and second cores (110, 120) are connected to the bobbin (20), the first core upper portion (112) and the second core upper portion (122) can be physically connected to each other, and the first core lower portion (113) and the second core lower portion (123) can be physically connected to each other. In addition, the first and second core upper portions (112, 122) and the first and second core lower portions (113, 123) can be positioned to surround the bobbin (20).

[0058] After the first and second cores (110, 120) are fastened to the bobbin (20), the core fixing frame (130) can be coupled with the first and second cores (110, 120) in a form that surrounds at least a portion of the first and second cores (110, 120) to secure the fastening of the first and second cores (110, 120).

[0059] A first core side groove (110g) may be formed at a predetermined depth on one side of the first core side (111) of the first core (110), and a second core side groove (120g) may be formed at a predetermined depth on one side of the second core side (121) of the second core (120).

[0060] The first core side groove (110g) may correspond to the position of the lower flange side groove (101b), and the second core side groove (120g) may correspond to the position of the upper flange side groove (102b).

[0061] A bobbin insertion hole (10h) can be formed while the first core (110) and the second core (120) are connected to each other, and a bobbin (20) can be positioned in the space between the first core (110) and the second core (120) by the bobbin insertion hole (10h).

[0062] - Conductive plate

[0063] Fig. 11 is a perspective view of a conductive plate constituting an embodiment of the present invention, Fig. 12 illustrates the conductive plate being coupled to a bobbin, and Fig. 13 illustrates the conductive plate being fastened to a bobbin on a core.

[0064] Referring to FIGS. 11 to 13, the conductive plate (30) constituting the embodiment of the present invention can constitute a secondary output. The conductive plate (30) can be composed of first to sixth conductive plates (31, 32, 33, 34, 35, 36). These can be composed in the same number as the number of the 2-1 to 2-6 winding sections (220a, 220b, 220c, 220d, 220e, 220f) described above.

[0065] Each of the first to sixth conductive plates (31, 32, 33, 34, 35, 36) has a U-shape and can be positioned spaced apart from each other by a predetermined distance. They are inserted toward one side of the bobbin (20) at a position where the lower and upper flange side grooves (101b, 102b) are formed (in the direction of the arrow in FIG. 12), and some areas of both ends of the first to sixth conductive plates (31, 32, 33, 34, 35, 36) can be pulled out toward the other side of the bobbin (20) where the lower and upper flange side grooves (101a, 102b) are formed.

[0066] Each of the first to sixth conductive plates (31, 32, 33, 34, 35, 36) can be fastened to the bobbin (20) at a position surrounding each of the second-first to second-sixth winding sections (220a, 220b, 220c, 220d, 220e, 220f). The first conductive plate (31) surrounds the 2-1 winding section (220a) and is positioned on the 2-1 winding section (220a), the second conductive plate (32) surrounds the 2-2 winding section (220b) and is positioned on the 2-2 winding section (220b), the third conductive plate (33) surrounds the 2-3 winding section (220c) and is positioned on the 2-3 winding section (220c), the fourth conductive plate (34) surrounds the 2-4 winding section (220d) and is positioned on the 2-4 winding section (220d), the fifth conductive plate (35) surrounds the 2-5 winding section (220e) and is positioned on the 2-5 winding section (220e), and the sixth conductive plate (36) surrounds the 2-6 winding section (220f). It can be positioned on the 2-6 winding section (220f). That is, each of the 1st to 6th conductive plates (31, 32, 33, 34, 35, 36) surrounds each of the 2-1st to 2-6th winding sections (220a, 220b, 220c, 220d, 220e, 220f), and some areas can be inserted into a plurality of insertion grooves (210g).

[0067] When the conductive plate (30) is installed on the bobbin (20) within the core (10), both ends of each of the first to sixth conductive plates (31, 32, 33, 34, 35, 36) may protrude outwardly from the core (10). In addition, each of the first to sixth conductive plates (31, 32, 33, 34, 35, 36) may protrude further outwardly from the core (10) than the 2-1 to 2-6 winding sections (220a, 220b, 220c, 220d, 220e, 220f).

[0068] Although not shown in the drawing, when the conductive plate (30) is fastened to the bobbin (20), a winding can be fastened to the space between each of the first to sixth conductive plates (31, 32, 33, 34, 35, 36). Accordingly, the first to sixth conductive plates (31, 32, 33, 34, 35, 36) can serve as a partition between the winding bundles and can be made of a copper material, but is not limited thereto.

[0069] - Connector

[0070] Fig. 14 is a perspective view of a connector constituting an embodiment of the present invention, and Fig. 15 illustrates the connector installed on a core.

[0071] Referring to FIGS. 11, 14, and 15, a connector (40) constituting an embodiment of the present invention may be a connector for configuring the number of turns of a conductive plate (30). The connector (40) may be made of copper, but is not limited thereto. The connector (40) may be composed of a connector plate (41), a first bending portion (42), and a second bending portion (43).

[0072] The connector plate (41) has one side facing the bobbin (20), and the first bent portion (42) can be formed by extending from the connector plate (41) by bending perpendicularly to the connector plate (41) near one side of the upper surface as a part of the upper surface of the connector plate (41), and the second bent portion (43) can be formed by extending from the connector plate (41) by bending perpendicularly to the connector plate (41) near the other side of the lower surface as a part of the lower surface of the connector plate (41).

[0073] The connector (40) is positioned on the inside of the conductive plate (30) fastened to the bobbin (20), and the upper surface of the first bending portion (42) faces the first to third conductive plates (31, 32, 33), and the lower surface of the second bending portion (43) faces the fourth to sixth conductive plates (34, 35, 36).

[0074] - Cover

[0075] Fig. 16 is a perspective view of a cover constituting an embodiment of the present invention, and Fig. 17 illustrates a connector being connected to a conductive plate on a core.

[0076] Referring to FIG. 11, FIG. 14 to FIG. 17, the cover (50) is configured in a plate shape and a plurality of through holes (50h) can be formed.

[0077] A plurality of through holes (50h) may be formed so that an area of ​​a conductive plate (30) protruding outwardly from the core (10) is inserted, and the first and second bending portions (42, 43) of the connector (40) are inserted. At least some of the plurality of through holes (50h) may be configured as a single hole.

[0078] Fig. 18 is an exploded perspective view of a portion of a high-density and high-efficiency transformer according to another embodiment of the present invention, and Fig. 19 is a perspective view of a connector constituting another embodiment of the present invention. In addition, Fig. 20 illustrates a state in which the connector is installed within the core.

[0079] Referring to FIG. 11, FIG. 18 to FIG. 20, a transformer (1) according to another embodiment of the present invention may have five conductive plates (30), and corresponding to the five conductive plates (30), the shapes of the first and second winding sections (210, 220) of the bobbin (20) may also be different from the above-described embodiment.

[0080] A connector (40) constituting a transformer (1) according to another embodiment of the present invention may be composed of first to fourth connectors (40a, 40b, 40c, 40d). The first to fourth connectors (40a, 40b, 40c, 40d) may be spaced apart from each other by a predetermined interval.

[0081] The connector (40) may be composed of a connector bar (44), a first bent portion (42), and a second bent portion (43). The connector bar (44) may have a bar-type shape. The first bent portion (42) may have a protruding shape extending vertically from one side of the connector bar (44) to the connector bar (44), and the second bent portion (43) may have a protruding shape extending vertically from the other side of the connector bar (44) to the connector bar (44). The connector bar (44) may be connected to the second bent portion (43) in a diagonal shape from the first bent portion (42). Accordingly, the first bent portion (42) of the first connector (40a) may face one side of the second conductive plate (32), and the second bent portion (43) may face the other side of the first conductive plate (31). And, the first bent portion (42) of the second connector (40b) may face one side of the third conductive plate (33), and the second bent portion (43) may face the other side of the second conductive plate (32). And, the first bent portion (42) of the third connector (40c) may face one side of the fourth conductive plate (34), and the second bent portion (43) may face the other side of the third conductive plate (33). And, the first bent portion (42) of the second connector (40b) may face one side of the fifth conductive plate (35), and the second bent portion (43) may face the other side of the fourth conductive plate (34).

[0082] In addition, a plurality of through holes (50h) may be formed in the cover (50), into which an area of ​​a conductive plate (30) protruding outwardly from the core (10) may be inserted, and into which the first and second bending portions (42, 43) of the connector (40) may be inserted. At least some of the plurality of through holes (50h) may be configured as a single hole.

[0083] FIG. 21 is a perspective view of a high-density and high-efficiency transformer according to another embodiment of the present invention, and FIG. 22 illustrates cores constituting the high-density and high-efficiency transformer according to an embodiment of the present invention before (a) and after (b) coupling.

[0084] Referring to FIGS. 21 and 22, a slit (190) may be formed in the core (10) of a high-density and high-efficiency transformer (1) according to another embodiment of the present invention.

[0085] A slit (191, 192) may be formed on each of the upper and lower surfaces of the core (10). Specifically, a groove of a predetermined depth is formed inwardly on the first core upper portion (112) of the first core (110) constituting the core (10), and a groove of a predetermined depth is formed inwardly on the second core upper portion (122) of the second core (120). When the first and second cores (110, 120) are coupled to each other, the groove formed in each of the first and second core upper portions (112, 122) may form a first slit (191) as a single hole. In addition, a groove of a predetermined depth is formed inwardly in the first core lower part (113) of the first core (110) constituting the core (10), and a groove of a predetermined depth is formed inwardly in the second core lower part (123) of the second core (120). When the first and second cores (110, 120) are coupled to each other, the grooves formed in each of the first and second core lower parts (113, 123) can form a second slit (192) as a single hole.

[0086] Each of the first and second slits (191, 192) can increase the heat dissipation effect of the transformer (1) by providing a path for dissipating heat inside the transformer (1).

[0087] The first core (110) may be composed of a first core side portion (111) facing the lower flange (101), a first core upper portion (112) extending from one side of the first core side portion (111) and vertically bent from the first core side portion (111), a first core lower portion (113) extending from the other side of the first core side portion (111) and vertically bent from the first core side portion (111), and a first core protrusion (114) extending from the central region of the first core side portion (111) to a predetermined length from the inner side of the first core side portion (111) facing the second core side portion (121) toward the inner side of the second core side portion (121).

[0088] The second core (120) may be composed of a second core side portion (121) facing the lower flange (101), a second core upper portion (122) extending from one side of the second core side portion (121) and vertically bent from the second core side portion (121), a second core lower portion (123) extending from the other side of the second core side portion (121) and vertically bent from the second core side portion (121), and a second core protrusion (124) extending from the central region of the second core side portion (121) to a predetermined length from the inner side of the second core side portion (121) facing the first core side portion (111) toward the inner side of the first core side portion (111).

[0089] Although the detailed description of the present invention has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims below. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

[0090] The embodiment can be used in various electronic devices including transformers.

Claims

1. Core; A bobbin inserted into the above core; a plurality of conductive plates coupled to the bobbin; and a connector positioned between the plurality of conductive plates; The above bobbin includes a winding portion and a lower flange and an upper flange provided on both sides of the winding portion, The above winding section includes first and second winding sections, The first winding section has a plurality of insertion grooves formed spaced apart from each other along the outer surface, The second winding portion is inserted into each of the plurality of insertion grooves and surrounds the first winding portion, and both ends protrude outside the first winding portion. The plurality of conductive plates are inserted into each of the plurality of insertion grooves to surround the second winding section and have both ends protruding outward from the first winding section. High density and high efficiency transformer.

2. In paragraph 1, The first and second winding sections are formed integrally. High density and high efficiency transformer.

3. In paragraph 1, A coil is wound in the area between the plurality of conductive plates. High density and high efficiency transformer.

4. In paragraph 1, The above second winding part has a U shape. High density and high efficiency transformer.

5. In paragraph 1, The above plurality of conductive plates have a U shape. High density and high efficiency transformer.

6. In paragraph 1, The above connector includes a connector plate, a first bent portion bent on one side of the connector plate, and a second bent portion bent on the other side of the connector plate, The first bending portion faces some of the plurality of conductive plates, and the second bending portion faces the remainder of the plurality of conductive plates. High density and high efficiency transformer.

7. In paragraph 1, The connector is composed of a plurality of connectors, and each of the plurality of connectors includes a connector bar, a first bent portion bent from one side of the connector bar, and a second bent portion bent from the other side of the connector bar. In any of the plurality of connectors, the first bend portion faces one of the plurality of conductive plates, and the second bend portion faces another of the plurality of conductive plates. High density and high efficiency transformer.

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