inductor

Abstract

The present application provides an inductor that improves electromagnetic characteristics while reducing the height of the inductor itself. The inductor (100) has a magnetic core (200) and a coil (400). The magnetic core (200) has a first edge (220) and a second edge (250). The coil (400) has a first terminal (410), a second terminal (490), a first portion (430), a second portion (470), a third portion (450), a first connecting portion (420), a second connecting portion (480), a first extension portion (440), and a second extension portion (460). The first portion (430) and the second portion (470) are separated from and parallel to the first edge (220), and are separated from the third portion (450) in a first horizontal direction. In a second horizontal direction, the first portion (430) and the second portion (470) each have a smaller size than the third portion (450). The third portion (450) is separated from and parallel to the second edge (250).

Description

Technical Field

[0001] This invention relates to an inductor having a magnetic core and a coil. Background Technology

[0002] One such inductor is disclosed in Patent Document 1. Specifically, in Patent Document 1, such as... Figure 12 The diagram discloses an inductor 892 in which a coil 894 wound with the winding axis in the Z direction is embedded in a magnetic core 896; furthermore, as shown... Figure 13 The diagram discloses an inductor 900 in which a zigzag coil 910, unfolded in a plane orthogonal to the Z-direction, is embedded in a magnetic core 920. Here, with... Figure 12 Compared to the 892 inductor, Figure 13 The 900 inductor achieves a low height for the inductor itself.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2004-197218. Summary of the Invention

[0006] Therefore, the object of the present invention is to provide an inductor that further improves electromagnetic characteristics while pursuing a lower inductor height.

[0007] Solution for solving the problem

[0008] This invention provides an inductor, as a first inductor,

[0009] An inductor having a magnetic core and a coil,

[0010] The magnetic core has a first edge and a second edge.

[0011] The first edge and the second edge are in a separated position in the first horizontal direction.

[0012] The coil has a first terminal, a second terminal, a first portion, a second portion, a third portion, a first connecting portion, a second connecting portion, a first extension portion, and a second extension portion.

[0013] The first terminal and the second terminal are in a separated position in a second horizontal direction orthogonal to the first horizontal direction.

[0014] The first portion and the second portion are respectively separated from and parallel to the first edge, and are located in the first horizontal direction separated from the third portion.

[0015] In the second horizontal direction, the dimensions of the first and second portions are each smaller than the dimension of the third portion.

[0016] The third portion is separate from and parallel to the second edge.

[0017] The first connecting portion connects the first terminal and the first part.

[0018] The second connecting part connects the second terminal and the second portion.

[0019] The first extension connects the first portion and the third portion.

[0020] The second extension connects the second portion and the third portion.

[0021] The first part, the second part, the third part, the first connecting part, the second connecting part, the first extension part, and the second extension part are embedded in the magnetic core.

[0022] In addition, the present invention provides an inductor as a second inductor, as described in the first inductor, wherein,

[0023] The first portion has a first outer end and a first inner end.

[0024] The first connecting portion connects the first outer end and the first terminal.

[0025] The second portion has a second outer end and a second inner end.

[0026] The second connecting portion connects the second outer end and the second terminal.

[0027] The third part has a first end and a second end.

[0028] In the second horizontal direction, the first inner end is located further inward than the first end.

[0029] The first extension connects the first inner end and the first end.

[0030] In the second horizontal direction, the second inner end is located further inward than the second end.

[0031] The second extension connects the second inner end and the second end.

[0032] Furthermore, the present invention provides an inductor as a third inductor, as described in the second inductor, wherein,

[0033] The first extension extends along a first straight line connecting the first inner end and the first end, or extends in a manner that bulges outward compared to the first straight line.

[0034] The second extension extends along a second straight line connecting the second inner end and the second end, or extends in a manner that bulges outward compared to the second straight line.

[0035] Furthermore, the present invention provides an inductor as a fourth inductor, as described in any of the first to third inductors, wherein,

[0036] The first extension and the second extension extend at least partially in a direction that intersects the first horizontal direction.

[0037] Furthermore, the present invention provides an inductor as a fifth inductor, as described in any of the first to fourth inductors, wherein,

[0038] The first edge and the second edge extend parallel to each other.

[0039] Invention Effects

[0040] In the inductor of the present invention, the first and second portions of the coil are respectively separated from and parallel to the first edge of the magnetic core, and are located separated from the third portion of the coil in the first horizontal direction. Furthermore, the third portion of the coil is separated from and parallel to the second edge of the magnetic core. Therefore, it is possible to achieve both a lower inductor height and further improvement in electromagnetic characteristics.

[0041] Furthermore, in the inductor of the present invention, the first extension connects the first portion and the third portion, and the second extension connects the second portion and the third portion. The dimensions of the first portion and the second portion in the second horizontal direction are smaller than the dimensions of the third portion in the second horizontal direction. Therefore, in the inductor of the present invention, since the area enclosed by the third portion, the first extension, and the second extension is large within the magnetic core, it is configured to effectively magnetize the magnetic core when the coil is energized. Thus, the inductor of the present invention can achieve improved electromagnetic characteristics. Attached Figure Description

[0042] Figure 1 This is a perspective view of an inductor according to a first embodiment of the present invention. In the figure, the portion of the magnetic core that is obscured is indicated by dashed lines.

[0043] Figure 2 It means Figure 1 A top view of an inductor. In the figure, the obscured portion of the magnetic core is indicated by dashed lines.

[0044] Figure 3It means Figure 1 The diagram shows the front view of an inductor. Dashed lines indicate the obscured portions of the magnetic core.

[0045] Figure 4 It means Figure 1 A side view of an inductor. In the figure, the obscured portion of the magnetic core is indicated by dashed lines.

[0046] Figure 5 It means Figure 1 A three-dimensional diagram of the coil contained in the inductor.

[0047] Figure 6 It means Figure 5 A top view of the coil.

[0048] Figure 7 This is a perspective view of an inductor according to a second embodiment of the present invention. In the figure, the portion of the magnetic core that is obscured is indicated by dashed lines.

[0049] Figure 8 It means Figure 7 A top view of an inductor. In the figure, the obscured portion of the magnetic core is indicated by dashed lines.

[0050] Figure 9 This is a three-dimensional diagram showing an inductor as a comparative example. In the diagram, the obscured portion of the magnetic core is indicated by dashed lines.

[0051] Figure 10 It means Figure 9 A top view of an inductor. In the figure, the obscured portion of the magnetic core is indicated by dashed lines.

[0052] Figure 11 This is a graph showing the DC superposition characteristics of the embodiments and comparative examples.

[0053] Figure 12 This is a perspective view of the inductor described in Patent Document 1. In the figure, the obscured portion of the magnetic core is indicated by dashed lines.

[0054] Figure 13 This is a perspective view of another inductor shown in Patent Document 1. In the figure, the obscured portion of the magnetic core is indicated by dashed lines. Detailed Implementation

[0055] (First Implementation)

[0056] like Figure 1 As shown, the inductor 100 of the first embodiment of the present invention has a magnetic core 200 and a coil 400.

[0057] Reference Figure 2In this embodiment, the magnetic core 200 is a pressed powder magnetic core. More specifically, the magnetic core 200 is formed by compressing soft magnetic powder and a binder. Here, the soft magnetic powder contained in the magnetic core 200 is composed of iron-based alloys, ferrites, etc., which have undergone insulation treatment. However, the magnetic core 200 of the present invention is not limited to this, and for example, it can be manufactured by any manufacturing method, such as bonding multiple magnetic materials with an adhesive.

[0058] like Figure 2 As shown, the magnetic core 200 of this embodiment has a generally square cylindrical shape extending in the vertical direction. When viewed in the vertical direction, the magnetic core 200 has a rounded rectangular shape. In this embodiment, the vertical direction is the Z direction. Here, the upper direction is designated as the +Z direction, and the lower direction as the -Z direction. The magnetic core 200 has a first edge 220 and a second edge 250.

[0059] like Figure 2 As shown, in this embodiment, the first edge 220 is one end of the magnetic core 200 in a first horizontal direction. In this embodiment, the first horizontal direction is the X direction. The first edge 220 forms one side of the rounded rectangle of the magnetic core 200. More specifically, the first edge 220 forms one side of the +X side of the rounded rectangle of the magnetic core 200. The first edge 220 is located on the +X side of the second edge 250 in the first horizontal direction. The first edge 220 extends along the second horizontal direction. In this embodiment, the second horizontal direction is the Y direction.

[0060] like Figure 2 As shown, in this embodiment, the second edge 250 is the remaining end of the magnetic core 200 in the first horizontal direction. The second edge 250 forms the other side of the rounded rectangle of the magnetic core 200. More specifically, the second edge 250 forms one side of the -X side of the rounded rectangle of the magnetic core 200. The second edge 250 extends along the second horizontal direction.

[0061] like Figure 2 As shown, the first edge 220 and the second edge 250 are separated from each other in a first horizontal direction. Furthermore, the first edge 220 and the second edge 250 extend parallel to each other. More specifically, the first edge 220 and the second edge 250 extend parallel to each other along a second horizontal direction.

[0062] like Figure 6 As shown, the coil 400 in this embodiment is a single-turn copper coil. The coil 400 has a first terminal 410, a first connecting portion 420, a first portion 430, a first extension portion 440, a third portion 450, a second extension portion 460, a second portion 470, a second connecting portion 480, and a second terminal 490.

[0063] like Figure 2As shown, in this embodiment, the first terminal 410 is exposed to the outside of the magnetic core 200. The first terminal 410 is disposed on one side of the +Y side of the rounded rectangle of the magnetic core 200.

[0064] like Figure 5 As shown, the first connecting portion 420 of this embodiment is orthogonal to the vertical direction. The first connecting portion 420 has a flat plate shape extending in the first horizontal direction. The first connecting portion 420 connects the first terminal 410 and the first portion 430.

[0065] from Figure 3 It can be seen that the first part 430 in this embodiment is orthogonal to the vertical direction. For example... Figure 6 As shown, the first portion 430 has a flat plate shape extending in the second horizontal direction. The first portion 430 is located on the +Y side of the second portion 470 in the second horizontal direction. Figure 2 As shown, the first portion 430 is separated from and parallel to the first edge 220. More specifically, the first portion 430 is separated from and parallel to the first edge 220 along its entire length. The first portion 430 is separated from the third portion 450 in a first horizontal direction. The first portion 430 has a first outer end portion 432 and a first inner end portion 436.

[0066] like Figure 6 As shown, in this embodiment, the first outer end portion 432 is the outer end of the first portion 430 in the second horizontal direction. That is, the first outer end portion 432 is the +Y end of the first portion 430 in the second horizontal direction. The first outer end portion 432 is connected to the first terminal 410 via the first connecting portion 420. That is, the first connecting portion 420 connects the first outer end portion 432 and the first terminal 410.

[0067] like Figure 6 As shown, in this embodiment, the first inner end portion 436 is the inner end of the first portion 430 in the second horizontal direction. That is, the first inner end portion 436 is the -Y end of the first portion 430 in the second horizontal direction.

[0068] like Figure 5 As shown, in this embodiment, the first extension 440 is orthogonal to the vertical direction. The first extension 440 has a flat plate shape extending in a direction intersecting both the first horizontal direction and the second horizontal direction. However, the invention is not limited to this; the first extension 440 may extend at least partially in a direction intersecting the first horizontal direction. The first extension 440 connects the first portion 430 and the third portion 450.

[0069] like Figure 5 As shown, the third portion 450 of this embodiment is orthogonal to the vertical direction. The third portion 450 has a flat plate shape extending in the second horizontal direction. Figure 2 As shown, the third portion 450 is separated from and parallel to the second edge 250. More specifically, the third portion 450 is separated from and parallel to the second edge 250 along its entire length. Figure 6 As shown, in the second horizontal direction, the dimension S3 of the third portion 450 is larger than the dimension S1 of the first portion 430. That is, in the second horizontal direction, the dimension S1 of the first portion 430 is smaller than the dimension S3 of the third portion 450. The third portion 450 has a first end 452 and a second end 456.

[0070] like Figure 6 As shown, in this embodiment, the first end portion 452 is an outer end of the third portion 450 in the second horizontal direction. That is, the first end portion 452 is the +Y end of the third portion 450. The first end portion 452 is connected to the first inner end portion 436 via a first extension 440. That is, the first extension 440 connects the first inner end portion 436 and the first end portion 452. In the second horizontal direction, the first end portion 452 is located outside the first inner end portion 436. That is, in the second horizontal direction, the first inner end portion 436 is located inside the first end portion 452.

[0071] like Figure 6 As shown, in this embodiment, the first extension 440 extends along a first straight line L1 connecting the first inner end portion 436 and the first end portion 452. However, the invention is not limited to this; the first extension 440 may also extend along the first straight line L1 connecting the first inner end portion 436 and the first end portion 452, or extend in a manner that protrudes outwards compared to the first straight line L1.

[0072] like Figure 5 As shown, in this embodiment, the second end 456 is the remaining outer end of the third portion 450 in the second horizontal direction. That is, the second end 456 is the -Y end of the third portion 450.

[0073] like Figure 5 As shown, in this embodiment, the second extension 460 is orthogonal to the vertical direction. The second extension 460 extends in a direction intersecting both the first and second horizontal directions. However, the invention is not limited to this; the second extension 460 may extend at least partially in a direction intersecting the first horizontal direction. Figure 6 As shown, the second extension 460 is not parallel to the first extension 440. The second extension 460 extends in a direction intersecting the extending direction of the first extension 440. The second extension 460 connects the second portion 470 and the third portion 450.

[0074] like Figure 5As shown, the second portion 470 of this embodiment is orthogonal to the vertical direction. The second portion 470 has a flat plate shape extending in the second horizontal direction. Figure 6 As shown, the second portion 470 is located on the -Y side of the first portion 430 in the second horizontal direction. (As...) Figure 2 As shown, the second portion 470 is separated from and parallel to the first edge 220. More specifically, the second portion 470 is separated from and parallel to the first edge 220 along its entire length. The second portion 470 is separated from the third portion 450 in a first horizontal direction. For example... Figure 6 As shown, in the second horizontal direction, the dimension S2 of the second portion 470 is smaller than the dimension S3 of the third portion 450. In the second horizontal direction, the interval D between the first portion 430 and the second portion 470 is smaller than the dimension S3 of the third portion 450. The second portion 470 has a second inner end portion 472 and a second outer end portion 476.

[0075] like Figure 6 As shown, in this embodiment, the second inner end portion 472 is the inner end of the second portion 470 in the second horizontal direction. That is, the second inner end portion 472 is the +Y end of the second portion 470 in the second horizontal direction. The second inner end portion 472 is connected to the second end portion 456 via the second extension portion 460. That is, the second extension portion 460 connects the second inner end portion 472 and the second end portion 456. In the second horizontal direction, the second inner end portion 472 is located inside the second end portion 456.

[0076] like Figure 6 As shown, the second extension 460 extends along the second straight line L2 connecting the second inner end portion 472 and the second end portion 456. However, the present invention is not limited thereto; the second extension 460 may also extend along the second straight line L2 connecting the second inner end portion 472 and the second end portion 456, or extend in a manner that protrudes outward compared to the second straight line L2.

[0077] like Figure 6 As shown, in this embodiment, the second outer end portion 476 is the outer end of the second portion 470 in the second horizontal direction. That is, the second outer end portion 476 is the -Y end of the second horizontal direction of the second portion 470.

[0078] like Figure 5 As shown, the second connecting portion 480 of this embodiment is orthogonal to the vertical direction. The second connecting portion 480 has a flat plate shape extending in the first horizontal direction. Figure 6 As shown, the second connecting portion 480 connects the second terminal 490 and the second portion 470. More specifically, the second connecting portion 480 connects the second outer end portion 476 and the second terminal 490.

[0079] like Figure 2 As shown, in this embodiment, the second terminal 490 is exposed towards the outside of the magnetic core 200. The second terminal 490 is disposed on one side of the -Y side of the rounded rectangle of the magnetic core 200. The first terminal 410 and the second terminal 490 are separated from each other in a second horizontal direction orthogonal to the first horizontal direction.

[0080] like Figure 3 and Figure 4 As shown, in the inductor 100 of this embodiment, the first portion 430, the second portion 470, the third portion 450, the first connecting portion 420, the second connecting portion 480, the first extension portion 440, and the second extension portion 460 are located on the same plane orthogonal to the vertical direction.

[0081] like Figure 1 and Figure 2 As shown, in the inductor 100 of this embodiment, the first portion 430, the second portion 470, the third portion 450, the first connecting portion 420, the second connecting portion 480, the first extension portion 440, and the second extension portion 460 are embedded in the magnetic core 200.

[0082] (Second Implementation)

[0083] Reference Figure 7 and Figure 8 The inductor 100A of the second embodiment of the present invention has the same characteristics as the inductor 100 of the first embodiment described above (see reference 100). Figure 1 The same structure. Therefore, in Figure 7 and Figure 8 In the structural elements shown, the same reference numerals are used to label the same structural elements as in the first embodiment. Furthermore, the orientation and direction of this embodiment are expressed using the same terms as in the first embodiment.

[0084] like Figure 8 As shown, the inductor 100A of this embodiment has a magnetic core 200 and a coil 400A. Here, the magnetic core 200 of this embodiment is the same as that of the inductor 100 of the first embodiment, so detailed description is omitted.

[0085] like Figure 8 As shown, similar to the coil 400 of the first embodiment, the coil 400A of this embodiment is a single-turn copper coil. More specifically, the coil 400A has a first terminal 410, a second terminal 490, a first portion 430, a second portion 470, a third portion 450, a first connecting portion 420, a second connecting portion 480, a first extension portion 440A, and a second extension portion 460A. Here, the structural elements other than the first extension portion 440A and the second extension portion 460A are the same as those of the coil 400 of the first embodiment, so detailed descriptions are omitted.

[0086] like Figure 7 As shown, the first extension 440A of this embodiment has a flat plate shape orthogonal to the vertical direction. The first extension 440A connects the first portion 430 and the third portion 450. More specifically, the first extension 440A connects the first inner end portion 436 and the first end portion 452.

[0087] like Figure 8 As shown, in this embodiment, the first extension 440A extends outward in a manner that protrudes compared to the first straight line L1A connecting the first inner end portion 436 and the first end portion 452. The first extension 440A has a straight portion 442 and an inclined portion 445.

[0088] like Figure 8 As shown, the straight section 442 of this embodiment is orthogonal to the vertical direction. The straight section 442 has a flat plate shape extending in the first horizontal direction. The straight section 442 is connected to the first end 452 of the third section 450.

[0089] like Figure 7 As shown, the inclined portion 445 in this embodiment is orthogonal to the vertical direction. Figure 8 As shown, the inclined portion 445 has a flat plate shape that intersects both the first horizontal direction and the second horizontal direction. The inclined portion 445 is connected to the straight portion 442. The inclined portion 445 is connected to the first inner end portion 436 of the first portion 430.

[0090] like Figure 7 As shown, the second extension 460A in this embodiment has a flat plate shape orthogonal to the vertical direction. For example... Figure 8 As shown, the second extension 460A is not parallel to the first extension 440A. The second extension 460A connects the second portion 470 and the third portion 450. More specifically, the second extension 460A connects the second inner end portion 472 and the second end portion 456.

[0091] like Figure 8 As shown, the second extension 460A extends outward in a manner that is raised compared to the second straight line L2A connecting the second inner end portion 472 and the second end portion 456. The second extension 460A has a straight portion 462 and an inclined portion 465.

[0092] like Figure 7 As shown, the straight section 462 of this embodiment is orthogonal to the vertical direction. The straight section 462 has a flat plate shape extending in the first horizontal direction. The straight section 462 is connected to the second end 456 of the third section 450. Figure 8 As shown, the straight portion 462 of the second extension 460A is parallel to the straight portion 442 of the first extension 440A.

[0093] like Figure 7 As shown, the inclined portion 465 in this embodiment is orthogonal to the vertical direction. Figure 8 As shown, the inclined portion 445 has a flat plate shape that intersects both the first horizontal direction and the second horizontal direction. The inclined portion 465 of the second extension 460A is not parallel to the inclined portion 445 of the first extension 440A. The inclined portion 465 of the second extension 460A extends in a direction that intersects the extending direction of the inclined portion 445 of the first extension 440A. The inclined portion 465 is connected to the straight portion 462. The inclined portion 465 is connected to the second inner end portion 472 of the second portion 470.

[0094] Reference Figure 7 In the inductor 100A of this embodiment, the first portion 430, the second portion 470, the third portion 450, the first connecting portion 420, the second connecting portion 480, the first extension portion 440A, and the second extension portion 460A are located on the same plane orthogonal to the vertical direction.

[0095] like Figure 8 As shown, in the inductor 100A of this embodiment, the first portion 430, the second portion 470, the third portion 450, the first connecting portion 420, the second connecting portion 480, the first extension portion 440A, and the second extension portion 460A are embedded in the magnetic core 200.

[0096] (DC superposition characteristics)

[0097] Reference Figure 11 Regarding the inductor 100 in the embodiment (refer to...) Figure 1 ) and the comparative example inductor 700 (see reference) Figure 9 as well as Figure 10 The results of the DC superposition characteristics measurement are explained.

[0098] Reference Figure 1 , Figure 2 and Figure 6The inductor 100 of this embodiment is manufactured as follows. First, regarding the coil 400, a blank is punched from a copper plate (0.2 mm thick) to form a base. The blank is temporarily placed in soft magnetic powder, with the portion of the coil 400 other than the first terminal 410 and the second terminal 490 embedded in it. Based on this, a magnetic core 200 is formed by pressing from above and below, embedding a portion of the coil 400 with a width of 0.3 mm. Here, the magnetic core 200 is a roughly square prism with dimensions of 4 mm in the first horizontal direction, 4 mm in the second horizontal direction, and 1.2 mm in the vertical direction. Furthermore, the first portion 430 has a dimension S1 of 1.5 mm in the second horizontal direction, the second portion 470 has a dimension S2 of 1.5 mm in the second horizontal direction, and the third portion 450 has a dimension S3 of 3.3 mm in the second horizontal direction. That is, in the second horizontal direction, the dimensions S1 and S2 of the first portion 430 and the second portion 470 are smaller than the dimension S3 of the third portion 450. Furthermore, in the second horizontal direction, the distance D between the first portion 430 and the second portion 470 is 0.3 mm. That is, in the second horizontal direction, the distance D between the first portion 430 and the second portion 470 is smaller than the dimension S3 of the third portion 450. In addition, the first portion 430 and the second portion 470 are separated from the first edge 220 of the magnetic core 200 by 0.3 mm, and the third portion 450 is separated from the second edge 250 of the magnetic core 200 by 0.3 mm. Furthermore, the first portion 430, the first extension 440, the third portion 450, the second extension 460, and the second portion 470 are arranged in the central portion of the magnetic core 200 in the vertical direction. After the magnetic core 200 is press-formed, the portions of the first terminal 410 and the second terminal 490 that are exposed to the outside, which correspond to the blank, are bent downward to form the first terminal 410 and the second terminal 490 with dimensions of 1.6 mm in the first horizontal direction, thus completing the inductor 100.

[0099] In addition, except for the shape of the coil 800, the inductor 700 of the comparative example is manufactured in the same manner as the inductor 100 of the above embodiment.

[0100] More specifically, refer to Figure 9 and Figure 10The comparative example inductor 700 has a magnetic core 200 and a coil 800. The magnetic core 200 of the comparative example inductor 700 has the same structure as the magnetic core 200 of the inductor 100 of the embodiment. Furthermore, the coil 800 has a first terminal 810, a second terminal 890, a first portion 830, a second portion 870, a third portion 850, a first connecting portion 820, a second connecting portion 880, a first extension portion 840, and a second extension portion 860. Among these structural elements, the first terminal 810, the second terminal 890, the first connecting portion 820, and the second connecting portion 880 have the same structure as the first terminal 410, the second terminal 490, the first connecting portion 420, and the second connecting portion 480 of the coil 400 of the inductor 100 of the embodiment. Additionally, in the coil 800, the first portion 830 and the second portion 870 have a dimension of 1.3 mm in the second horizontal direction, and the third portion 850 also has a dimension of 1.3 mm in the second horizontal direction. That is, in the second horizontal direction, the dimensions of the first portion 830 and the second portion 870 are each equal to the dimension of the third portion 850. Furthermore, the first portion 830 and the second portion 870 are each separated from the first edge 220 of the magnetic core 200 by 0.3 mm, and the third portion 850 is separated from the second edge 250 of the magnetic core 200 by 0.3 mm. In addition, the first portion 830, the first extension 840, the third portion 850, the second extension 860, and the second portion 870 are disposed at the center of the magnetic core 200 in the vertical direction.

[0101] Reference Figure 9 and Figure 10 The first portion 830 has a first outer end portion 832 and a first inner end portion 836. The second portion 870 has a second outer end portion 876 and a second inner end portion 872. The third portion 850 has a first end portion 852 and a second end portion 856. Unlike the inductor 100 of the embodiment, in the second horizontal direction, the first inner end portion 836 is located at the same position as the first end portion 852, and the second inner end portion 872 is located at the same position as the second end portion 856. A first extension portion 840 connects the first inner end portion 836 and the first end portion 852, and a second extension portion 860 connects the second inner end portion 872 and the second end portion 856. Unlike the first extension portion 440 and the second extension portion 460 of the coil 400 of the inductor 100 of the embodiment, the first extension portion 840 and the second extension portion 860 extend along the first horizontal direction. That is, the first extension portion 840 and the second extension portion 860 extend parallel to each other along their entire length.

[0102] Figure 11The results show the measurement results of the DC superposition characteristics of the inductor 100 of the embodiment and the inductor 700 of the comparative example. It can be seen that in the inductor 100 of the embodiment, the saturation current value with a 20% reduction in the L value is 33A, while in the inductor 700 of the comparative example, the saturation current value with a 20% reduction in the L value is 30A. Compared with the inductor 700 of the comparative example, the inductor 100 of the embodiment has superior DC superposition characteristics.

[0103] The present invention has been specifically described above with examples of embodiments, but the present invention is not limited thereto and can be modified and altered in various ways.

[0104] The magnetic core 200 of the inductors 100 and 100A in this embodiment has a generally square cylindrical shape, but the present invention is not limited thereto. That is, as long as the first portion 430 and the second portion 470 of the coils 400 and 400A are along the first edge 220 of the magnetic core 200, and the third portion 450 of the coils 400 and 400A is along the second edge 250 of the core 200, the core 200 can also be cylindrical or the like.

[0105] In this embodiment, the coils 400 and 400A of the inductors 100 and 100A are single-turn coils, but the present invention is not limited thereto. That is, the coils 400 and 400A can be multi-turn coils. Specifically, the coils 400 and 400A can be configured such that the third portion 450 is divided into two parts, and a loop is added from the divided end toward the inward side.

[0106] The coil 400A of the inductor 100A in this embodiment has inclined portions 445 and 465, but the present invention is not limited thereto. That is, the coil 400A of the inductor 100A may also have two connecting portions instead of inclined portions 445 and 465, and the two connecting portions have a stepped shape when viewed in the vertical direction and extend non-parallel to each other along their entire length.

[0107] Explanation of reference numerals in the attached figures

[0108] 100, 100A: Inductor

[0109] 200: Magnetic core

[0110] 220: First Edge

[0111] 250: Second Edge

[0112] 400, 400A: Coil

[0113] 410: First terminal

[0114] 420: Second connecting section

[0115] 430: Part 1

[0116] 432: First outer end

[0117] 436: First inner end

[0118] 440, 440A: First extension

[0119] 442: Straight section

[0120] 445: Inclined section

[0121] 450: Third part

[0122] 452: First end

[0123] 456: Second end

[0124] 460, 460A: Second extension

[0125] 462: Straight section

[0126] 465: Inclined section

[0127] 470: Second part

[0128] 472: Second inner end

[0129] 476: Second outer end

[0130] 480: Second Link

[0131] 490: Second terminal

[0132] 700: Inductor

[0133] 800: Coil

[0134] 810: First terminal

[0135] 820: First Linkage Section

[0136] 830: Part 1

[0137] 832: First outer end

[0138] 836: First inner end

[0139] 840: First Extension

[0140] 850: Third part

[0141] 852: First end

[0142] 856: Second end

[0143] 860: Second Extension

[0144] 870: Second Part

[0145] 872: Second inner end

[0146] 876: Second outer end

[0147] 880: Second connecting section

[0148] 890: Second terminal

[0149] D: Interval

[0150] L1, L1A: First straight line

[0151] L2, L2A: Second straight line

[0152] S1: Size

[0153] S2: Size

[0154] S3: Size

Claims

1. An inductor having a magnetic core and a coil, The magnetic core has a first edge and a second edge. The first edge and the second edge are in a separated position in the first horizontal direction. The coil has a first terminal, a second terminal, a first portion, a second portion, a third portion, a first connecting portion, a second connecting portion, a first extension portion, and a second extension portion. The first terminal and the second terminal are in a separated position in a second horizontal direction orthogonal to the first horizontal direction. The first portion and the second portion are respectively separated from and parallel to the first edge, and are located in the first horizontal direction separated from the third portion. In the second horizontal direction, the dimensions of the first and second portions are each smaller than the dimension of the third portion. The third portion is separate from and parallel to the second edge. The first connecting portion connects the first terminal and the first part. The second connecting part connects the second terminal and the second portion. The first extension connects the first portion and the third portion. The second extension connects the second portion and the third portion. The first portion, the second portion, the third portion, the first connecting portion, the second connecting portion, the first extension portion, and the second extension portion are embedded in the magnetic core. In the first horizontal direction, the first portion is located further outward than either the first terminal or the second terminal. The first portion is located between the first terminal and the first edge in the first horizontal direction. The first portion is located between the second terminal and the first edge in the first horizontal direction. In the first horizontal direction, the second portion is located further outward than either the first terminal or the second terminal. The second portion is located between the first terminal and the first edge in the first horizontal direction. The second portion is located between the second terminal and the first edge in the first horizontal direction. In the first horizontal direction, the third portion is located further outward than either the first terminal or the second terminal. The third portion is located in the first horizontal direction between the first terminal and the second edge. The third portion is located between the second terminal and the second edge in the first horizontal direction. The end of the first connector on the first terminal side is closer to the first edge than the second edge. The end of the second connector on the second terminal side is closer to the first edge than the second edge. The third part has a first end and a second end. The first end and the first connecting portion are side by side in the first horizontal direction. The second end and the second connecting portion are side by side in the first horizontal direction. The coil is symmetrical about a straight line that is orthogonal to the second horizontal direction and passes through the center of the third portion in the second horizontal direction.

2. The inductor according to claim 1, wherein, The first portion has a first outer end and a first inner end. The first connecting portion connects the first outer end and the first terminal. The second portion has a second outer end and a second inner end. The second connecting portion connects the second outer end and the second terminal. In the second horizontal direction, the first inner end is located further inward than the first end. The first extension connects the first inner end and the first end. In the second horizontal direction, the second inner end is located further inward than the second end. The second extension connects the second inner end and the second end.

3. The inductor according to claim 2, wherein, The first extension extends along a first straight line connecting the first inner end and the first end, or extends in a manner that bulges outward compared to the first straight line. The second extension extends along a second straight line connecting the second inner end and the second end, or extends in a manner that bulges outward compared to the second straight line.

4. The inductor according to claim 1, wherein, The first extension and the second extension extend at least partially in a direction that intersects the first horizontal direction.

5. The inductor according to claim 1, wherein, The first edge and the second edge extend parallel to each other.

6. The inductor according to claim 1, wherein, The magnetic core is formed by compressing soft magnetic powder and binder.

7. The inductor according to any one of claims 1 to 6, wherein, The coil is made from a single copper plate. The first terminal is exposed to the outside of the magnetic core. The second terminal is exposed to the outside of the magnetic core.

Images