Magnetic element

Abstract

The present invention relates to a magnetic element capable of maximizing a cross-sectional area and the number of turns of a coil and minimizing heat generation by sharing a pattern when N transformers are mounted in a reference area. The magnetic element comprises: a first core part having a pair of cores which are electromagnetically coupled to each other; a second core part disposed adjacent to one side of the first core part in a first horizontal direction; a first coil part commonly disposed on the first core part and the second core part; and a plurality of second coil parts disposed on each of the first core part and the second core part. Therefore, the present invention can increase a cross-sectional area and the number of turns of a coil in the same area, and reduce a heat generation temperature.

Description

magnetic elements

[0001] The present invention relates to a magnetic element, and more particularly, to a magnetic element capable of maximizing the cross-sectional area and number of turns of a coil and minimizing heat generation by sharing a pattern when mounting N transformers on a reference area.

[0002] Magnetic elements are a general term for components that utilize the magnetic action caused by the current flowing through a coil. Examples include transformers, inductors, and electromagnetic interference (EMI) filters. They are used for purposes such as noise removal, high-frequency radiation blocking, and current and voltage boosting or lowering.

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

[0004] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0005] Referring to Fig. 1, a typical slim transformer (10) includes a core portion including an upper core (11) and a lower core (12), and a secondary coil (13) and a primary coil (14) arranged between the upper core (11) and the lower core (12). The secondary coil (13) is usually composed of a plurality of conductive metal plates, and the primary coil (14) is usually formed by winding a conductive wire.

[0006] Depending on the needs, multiple transformers, for example, N, may need to be placed within an electronic product. When N transformers are placed within the reference area allocated to adjacent transformers, the number of turns applicable to each transformer is N / 2. To design N transformers that satisfy the required N-turn specification, an area at least 35% larger than the reference area is required. Therefore, a technology is required to reduce the area occupied by N transformers and thereby increase space utilization.

[0007] The present invention aims to provide a magnetic element capable of increasing the cross-sectional area and number of turns of a coil in the same area.

[0008] Another object of the present invention is to provide a magnetic element capable of lowering the heating temperature.

[0009] To achieve this purpose, a magnetic element according to the present invention may include a first core portion having a pair of cores that are electromagnetically coupled to each other; a second core portion arranged adjacent to one side of the first core portion in a first horizontal direction; a first coil portion arranged in common with the first core portion and the second core portion; and a plurality of second coil portions arranged respectively in the first core portion and the second core portion.

[0010] In the magnetic element according to the present invention, the first coil portion and the plurality of second coil portions can all be arranged in a pattern shape that is vertically stacked on one substrate.

[0011] In a magnetic element according to the present invention, a first coil portion may include a first-first coil portion; and a first-second coil portion having a second portion disposed below the first-first coil portion and connected to a first portion of the first-first coil portion through a via.

[0012] In the magnetic element according to the present invention, a portion of the first-first coil portion and a portion of the first-second coil portion may be arranged to overlap the first core portion and the second core portion in the vertical direction.

[0013] In the magnetic element according to the present invention, a portion of the first-first coil section and a portion of the first-second coil section that overlap in the vertical direction may have the same width.

[0014] In the magnetic element according to the present invention, the second coil portion may include a 2-1 coil portion arranged above the 1-1 coil portion; and a 2-2 coil portion arranged below the 1-2 coil portion.

[0015] In the magnetic element according to the present invention, a part of the 2-1 coil section and a part of the 2-2 coil section may be arranged to overlap a part of the 1-1 coil section and a part of the 1-2 coil section and a part of the first core section and a second core section in a vertical direction.

[0016] In the magnetic element according to the present invention, the first core portion may include a first upper core and a first lower core arranged symmetrically with the first upper core along a vertical direction, and the second core portion may include a second upper core and a second lower core arranged symmetrically with the second lower core along a vertical direction.

[0017] In the magnetic element according to the present invention, the first upper core, the first lower core, the second upper core, and the second lower core have a plurality of outer legs that protrude in the vertical direction and face each other in the horizontal direction.

[0018] In the magnetic element according to the present invention, the first coil portion may be arranged to surround the outer groups that are horizontally adjacent to each other among the plurality of outer groups.

[0019] In the magnetic element according to the present invention, a plurality of extrinsic groups may have widths of the same size.

[0020] In the magnetic element according to the present invention, horizontally adjacent extremities among the plurality of extremities may have widths of different sizes.

[0021] The magnetic element according to the present invention can be designed to have a sufficient number of turns by sharing the coil when two transformers are placed on a reference area. Furthermore, by allocating sufficient area to the core, the margin can be reduced, thereby reducing heat generation during system operation. If the overall module size needs to be reduced, the margin can be reduced, thereby reducing the mounting area of ​​the transformer.

[0022] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0023] Figure 2 is a perspective view showing an example of a magnetic element according to the present invention.

[0024] Figure 3 is an exploded perspective view showing an example of a magnetic element according to the present invention.

[0025] Figure 4 is an exemplary diagram showing the coupling relationship of the primary coil in the magnetic element according to the present invention.

[0026] Figure 5 is a perspective view showing the configuration of a core portion in a magnetic element according to the present invention.

[0027] Figure 6 is a perspective view showing the shape of a substrate in a magnetic element according to the present invention.

[0028] Figure 7 is a cross-sectional view taken along line A-A' of Figure 2.

[0029] With respect to the embodiments of the present invention disclosed in the text, specific structural and functional descriptions are merely exemplified for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described in the text.

[0030] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to specific disclosed forms, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0031] While terms like "first" and "second" may be used to describe various components, these 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 first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0032] 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 there may also be other components in between. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", should be interpreted similarly. Similarly, "disposed on" can mean disposed directly on the surface of another component or disposed above the surface by a distance.

[0033] 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 "comprises" or "has" indicate the presence of a disclosed feature, number, step, operation, component, part, or combination thereof, 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.

[0034] 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 to have a meaning consistent with their meaning in the context of the relevant technology, and shall not be construed in an idealized or overly formal sense unless explicitly defined herein.

[0035] Meanwhile, if a particular embodiment can be implemented differently, the functions or operations specified within a particular block may occur in a different order than specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, or, depending on the related functions or operations, the blocks may be performed in reverse order.

[0036] Hereinafter, a magnetic element according to the present invention will be described with reference to the attached drawings. The magnetic element according to the embodiment is described using a Cartesian coordinate system (x-axis, y-axis, z-axis). In the Cartesian coordinate system, the x-axis, y-axis, and z-axis shown in each drawing are orthogonal to each other, but the embodiment is not limited thereto. The x-axis, y-axis, and z-axis may also intersect each other.

[0037] Fig. 2 is a perspective view showing an example of a magnetic element according to the present invention, and Fig. 3 is an exploded perspective view showing an example of a magnetic element according to the present invention.

[0038] A magnetic element according to the present invention comprises a first core portion (100), a second core portion (200), a first coil portion (P10), a second coil portion (P20), and a substrate (S).

[0039] The first core part (100) and the second core part (200) are arranged on the same line in the first horizontal direction (x-axis direction). The second core part (200) is arranged adjacent to one side of the first core part (100) at a predetermined distance (D1).

[0040] The first core part (100) is composed of a pair of first upper cores (110) and first lower cores (120) that are formed with the same shape and are electromagnetically coupled. The first lower core (120) is formed with the same shape as the first upper core (110) and is arranged symmetrically to the first upper core (110) in the vertical direction (z-axis direction) below the first upper core (110).

[0041] The second core part (100) is composed of a pair of second upper cores (210) and second lower cores (220) that are formed with the same shape and are electromagnetically coupled. The second lower core (220) is arranged symmetrically to the second upper core (210) in the vertical direction (z-axis direction) below the second upper core (210).

[0042] In Fig. 3, the description of the printed circuit board is omitted, and only the plating pattern of the coil is shown for convenience. That is, the first coil (P10) and the second coil (P20) are stacked and arranged inside the printed circuit board (S).

[0043] In the magnetic element according to the present invention, the first coil portion (P10) and the second coil portion (P20) are formed as conductive patterns on a substrate rather than in the shape of coils. In the past, coils were formed by winding copper wires, but for slimmer designs, patterns are now formed using metal materials on a printed circuit board.

[0044] The first coil portion (P10) includes a first-first coil portion (P11) and a first-second coil portion (P12) disposed below the first-first coil portion (P11). The first-first coil portion (P11) is formed of a metal pattern connected from the first-first coil terminal (S11) to the first-first connection terminal (T11). The first-second coil portion (P12) is formed of a metal pattern connected from the first-second coil terminal (S12) to the first-second connection terminal (T12). It is preferable that the pattern widths of the first-first coil portion (P11) and the first-second coil portion (P12) are the same.

[0045] The second coil part (P20) includes a second-first coil part (P21) disposed above the first coil part (P10) and a second-second coil part (P22) disposed below the first coil part (P10). The second-first coil part (P21) includes an upper second-first coil (P21L) disposed in the first core part (100) and an upper second-second coil (P21R) disposed in the second core part (200). The second-second coil part (P22) includes a lower second-first coil (P22L) disposed in the first core part (100) and a lower second-second coil (P22R) disposed in the second core part (200). It is also preferable that the pattern widths of the second-first coil part (P21) and the second-second coil part (P22) are the same.

[0046] Figure 4 is an exemplary diagram showing the coupling relationship of the primary coil in the magnetic element according to the present invention.

[0047] The first-first coil portion (P11) and the first-second coil portion (P12) constituting the first coil portion (P10) are vertically stacked within the substrate (S). The first-first coil portion (P11) and the first-second coil portion (P12) each have a spiral plane shape and can form a plurality of turns.

[0048] The 1-1 coil terminal (S11) of the 1-1 coil portion (P11) is arranged on the edge side of the substrate (S), and the 1-1 connection terminal (T11) is arranged at the innermost part of the spiral pattern. That is, the 1-1 coil portion (P11) can extend from the 1-1 coil terminal (S11) on the edge side of the substrate (S) along the longitudinal axis direction (y-axis direction) of the substrate and then extend from the outside to the inside in a spiral pattern to the 1-1 connection terminal (T11).

[0049] The first-second coil terminal (S12) of the first-second coil portion (P12) is arranged on the edge side of the substrate (S), and the first-second connection terminal (T12) is arranged at the innermost side of the spiral pattern. That is, the first-second coil portion (P12) can extend from the first-second coil terminal (S12) on the edge side of the substrate (S) along the short axis direction (x-axis direction) of the substrate, and then extend from the outside to the inside to the first-second connection terminal (T12) in a spiral pattern.

[0050] Meanwhile, the 1-1 coil terminal (S11) of the 1-1 coil portion (P11) and the 1-2 coil terminal (S12) of the 1-2 coil portion (P12) may be spaced apart from each other in the long-axis direction (y-axis direction) of the substrate (S), but the lengths extending outward from the substrate (S) along the short-axis direction (x-axis direction) of the substrate (S) may be the same.

[0051] The spiral patterns of the 1-1 coil portion (P11) and the 1-2 coil portion (P12) have opposite rotation directions. That is, the 1-1 coil portion (P11) may have a spiral pattern that rotates clockwise from the 1-1 coil terminal (S11) toward the 1-1 connection terminal (T11), and the 1-2 coil portion (P12) may have a spiral pattern that rotates counterclockwise from the 1-2 coil terminal (S12) toward the 1-2 connection terminal (T12).

[0052] Here, the 1-1 connection terminal (T11) of the 1-1 coil portion (P11) and the 1-2 connection terminal (T12) of the 1-2 coil portion (P12) overlap at least partially on a plane and can be electrically connected through a via hole (not shown) penetrating the substrate (S).

[0053] Due to the electrical connection through these via holes and the spiral pattern having opposite rotational directions, when the 1-1 coil terminal (S11) of the 1-1 coil section (P11) becomes the input terminal of the primary current and the 1-2 coil terminal (S12) of the 1-2 coil section (P12) becomes the output terminal of the primary current, the current flowing within the 1-1 coil section (P10) consistently flows in one direction (i.e., clockwise).

[0054] The 1-1 coil portion (P11) starts from the 1-1 coil terminal (S11) and passes through the upper first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) forming a clockwise spiral pattern, and ends at the 1-1 connection terminal (T11).

[0055] The 1-2 coil section (P12) starts from the 1-2 coil terminal (S12) and passes through the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) forming a counterclockwise spiral pattern, and ends at the 1-2 connection terminal (T12).

[0056] At this time, the upper first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) have regions that overlap with the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) in the vertical direction (z-axis direction), respectively.

[0057] Figure 5 is a perspective view showing the configuration of a core portion in a magnetic element according to the present invention.

[0058] The first core part (100) and the second core part (200) are arranged at a predetermined distance (D1) apart in the first horizontal direction (x-axis direction).

[0059] The first upper core (110) and the first lower core (120) forming the first core portion (100) are arranged symmetrically in the vertical direction (z-axis direction). The first upper core (110) and the first lower core (120) may have the same width. That is, the condition of W110 = W120 may be satisfied. In addition, the first upper core (110) and the first lower core (120) may have the same height. That is, the condition of H11 = H12 may be satisfied.

[0060] A first upper core (110) having a width of "W110" in a first horizontal direction (x-axis direction) has a first outer leg (111) and a second outer leg (112) that protrude downward in a vertical direction (z-axis direction) and face each other in a horizontal direction. A first lower core (120) having a width of "W120" has a first outer leg (121) and a second outer leg (122) that protrude upward in a vertical direction (z-axis direction) and face each other in a horizontal direction. The first outer leg (111) and the second outer leg (112) of the first upper core (110) and the first outer leg (121) and the second outer leg (122) of the first lower core (120) may all have the same width. For example, the condition of W111 = W112 = W121 = W122 may be satisfied. In addition, the distance between the first outer leg (111) and the second outer leg (112) of the first upper core (110) may be the same as the distance between the first outer leg (121) and the second outer leg (122) of the first lower core (120). That is, the condition of D110 = D120 may be satisfied.

[0061] The second upper core (210) and the second lower core (220) forming the second core portion (200) are arranged symmetrically in the vertical direction (z-axis direction). The second upper core (210) having a width of "W210" in the first horizontal direction (x-axis direction) has a first outer leg (211) and a second outer leg (212) protruding downward in the vertical direction (z-axis direction) and facing each other in the horizontal direction. The second lower core (220) having a width of "W220" has a first outer leg (221) and a second outer leg (222) protruding upward in the vertical direction (z-axis direction) and facing each other in the horizontal direction. The second upper core (210) and the second lower core (120) may have the same width. That is, the condition of W210 = W220 may be satisfied. In addition, the second upper core (210) and the second lower core (220) may have the same height. That is, the condition H21 = H22 can be satisfied.

[0062] The first outer leg (211) and the second outer leg (212) of the second upper core (210) and the first outer leg (221) and the second outer leg (222) of the second lower core (120) may all have the same width. For example, the condition of W211 = W212 = W221 = W222 may be satisfied. In the present embodiment, it is exemplified that all outer legs of the first core part (100) and the second core part (200) have the same width, but in some cases, the widths of the second outer legs (112, 122) of the first core part (100) and the first outer legs (211, 221) of the second core part (200) that are adjacent to each other may be the same, and may have different widths from the outer legs facing each other in the horizontal direction. That is, the width of the second outer legs (112, 122) of the first core part (100) may be greater than the width of the first outer legs (111, 121) of the first core part (100), and the width of the first outer legs (211, 221) of the second core part (200) may be greater than the width of the second outer legs (212, 222) of the second core part (200).

[0063] In addition, the distance between the first outer leg (211) and the second outer leg (212) of the second upper core (210) may be the same as the distance between the first outer leg (221) and the second outer leg (222) of the second lower core (220). That is, the condition of D210 = D220 may be satisfied.

[0064] The first outer leg (111) of the first upper core (110) and the first outer leg (121) of the first lower core (120) overlap in the vertical direction (z-axis direction), and the second outer leg (112) of the first upper core (110) and the second outer leg (122) of the first lower core (120) overlap in the vertical direction (z-axis direction). Similarly, the first outer leg (211) of the second upper core (210) and the first outer leg (221) of the second lower core (220) overlap in the vertical direction (z-axis direction), and the second outer leg (212) of the second upper core (210) and the second outer leg (222) of the second lower core (220) overlap in the vertical direction (z-axis direction).

[0065] Fig. 6 is a perspective view showing the shape of a substrate in a magnetic element according to the present invention. As shown, the width of the substrate in the short axis direction (x-axis direction) may be shorter than the length in the second horizontal direction (y-axis direction). The length of the substrate (S) has a value that is the sum of the length (S11) of the first region in which the first coil portion and the second coil portion are laminated inside, the length (D2) of the second horizontal direction (y-axis direction) of the first core portion (100) and the second core portion (200), and the length (S12) of the second region in which the first coil portion and the second coil portion are laminated inside. At this time, the region in which the first outer leg (111) of the first upper core (110) of the first core portion (100) and the first outer leg (121) of the first lower core (120) vertically overlap each other forms a space as large as the second width (W2). Likewise, the region where the second outer leg (212) of the second upper core (210) of the second core part (200) and the second outer leg (222) of the second lower core (220) vertically overlap each other forms a space as large as the fourth width (W4). Meanwhile, the region corresponding to the width (W112) of the second outer leg (112) of the first upper core (120) of the first core part (100), the width (W211) of the first outer leg (211) of the second upper core (210) of the second core part (200), and the first direction (x-axis direction) separation distance (D1) between the first core part (100) and the second core part (200) has a space as large as the third width (W3).

[0066] Fig. 7 is a cross-sectional view taken along line A-A' of Fig. 2. As shown, the first upper core (110) and the first lower core (120) of the first core portion (100) overlap in the vertical direction (z-axis direction), and the second upper core (210) and the second lower core (220) of the second core portion (200) also overlap in the vertical direction. A portion of the first coil portion (P10) and the second coil portion (P20) laminated inside the substrate (S) may be arranged to be accommodated by overlapping each other in the vertical direction in the first core portion (100) and the second core portion (200).

[0067] A portion of the upper 2-1 coil (P21L) and a portion of the lower 2-1 coil (P22L) may vertically overlap a portion of the 1-1 coil portion (P11) and a portion of the 1-2 coil portion (P12). At this time, the upper 2-1 coil (P21L) is arranged to vertically overlap all of the upper 1 turn pattern (L11), the upper 2 turn pattern (L12), the upper 3 turn pattern (L13), and the upper 4 turn pattern (L14) of the 1-1 coil portion (P11). The lower first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) of the 1-1 coil portion (P11) are arranged so as to vertically overlap the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) of the 1-2 coil portion (P12). The lower second-1 coil portion (P22L) is arranged so as to vertically overlap the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) of the 1-2 coil portion (P12).

[0068] A portion of the upper 2-2 coil (P21R) and a portion of the lower 2-2 coil (P22R) may vertically overlap a portion of the 1-1 coil portion (P11) and a portion of the 1-2 coil portion (P12). At this time, the upper 2-2 coil (P21R) is arranged to vertically overlap all of the upper first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) of the 1-1 coil portion (P11). The lower first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) of the 1-1 coil portion (P11) are arranged so as to vertically overlap the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) of the 1-2 coil portion (P12). The lower second-2 coil (P22R) is arranged so as to vertically overlap the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) of the 1-2 coil portion (P12).

[0069] The first-first coil portion (P11) and the first-second coil portion (P12) of the first coil portion (P10) are arranged in a manner of wrapping the outer groups that are adjacent to each other in the horizontal direction among the plurality of outer groups.

[0070] The upper first turn pattern (L11), the upper second turn pattern (L12), the upper third turn pattern (L13), and the upper fourth turn pattern (L14) of the first-first coil portion (P11) and the lower first turn pattern (L21), the lower second turn pattern (L22), the lower third turn pattern (L23), and the lower fourth turn pattern (L24) of the first-second coil portion (P12) are all arranged in a form that surrounds the second outer leg (112) of the first upper core portion (110), the first outer leg (211) of the second upper core portion (210), the second outer leg (122) of the first lower core portion (120), and the first outer leg (221) of the second lower core portion (220).

[0071] As described above, the magnetic element according to the present invention can increase the cross-sectional area and number of turns of the coil in the same area and can exhibit the effect of lowering the heating temperature by being arranged in a form that surrounds the adjacent outer groups of two cores in which a part of the first coil part is arranged adjacent to each other.

[0072] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0073] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0074] The magnetic element according to the embodiment can be used in a power supply unit of an electronic device or a DC converter of an electric or hybrid vehicle.

Claims

1. A first core section having a pair of cores that are electromagnetically coupled to each other; A second core portion arranged adjacent to one side of the first core portion in the first horizontal direction; A first coil portion commonly disposed in the first core portion and the second core portion; and A magnetic element comprising a plurality of second coil sections each disposed in the first core section and the second core section.

2. In paragraph 1, A magnetic element in which the first coil portion and the plurality of second coil portions are all arranged in a pattern shape that is vertically stacked on one substrate.

3. In the second paragraph, the first coil part, 1-1 coil section; and A magnetic element comprising a first-second coil portion having a second portion disposed below the first-first coil portion and connected to the first portion of the first-first coil portion through a via.

4. In paragraph 3, A magnetic element in which a portion of the first-first coil portion and a portion of the first-second coil portion are arranged to overlap in the vertical direction with the first core portion and the second core portion.

5. In the fourth paragraph, a magnetic element in which a part of the 1-1 coil portion and a part of the 1-2 coil portion that overlap in the vertical direction have the same width.

6. In the third paragraph, each of the plurality of second coil sections, A 2-1 coil portion arranged on the upper side of the 1-1 coil portion; and A magnetic element including a 2-2 coil section arranged below the 1-2 coil section.

7. In paragraph 6, A magnetic element in which a part of the 2-1 coil portion and a part of the 2-2 coil portion are arranged to overlap in the vertical direction a part of the 1-1 coil portion, a part of the 1-2 coil portion, the first core portion, and the second core portion.

8. In paragraph 1, The first core portion includes a first upper core and a first lower core arranged symmetrically in the vertical direction below the first upper core, A magnetic element wherein the second core portion includes a second upper core and a second lower core arranged symmetrically in the vertical direction below the second upper core.

9. In paragraph 8, A magnetic element in which the first upper core, the first lower core, the second upper core, and the second lower core have a plurality of outer legs protruding along the vertical direction and facing each other in the horizontal direction.

10. In paragraph 9, The above first coil portion is a magnetic element that surrounds the outer groups among the plurality of outer groups that are adjacent to each other in the horizontal direction.

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