Winding component and power supply device

Abstract

To provide a winding component which can be easily manufactured and in which a bobbin and a coil can be accurately positioned, and to provide a power supply device.SOLUTION: Positioning can be performed at a plurality of positions by the first and second positioning mechanisms 5070 and. Further, the second positioning mechanism 70 includes, as the second locking portion 71, a hole 73 that receives the second engaging portion 72. By engaging the second engaging portion 72 with the hole portion 73, the second positioning mechanism 70 can restrict the displacement between the bobbin 40 and the coil 20 over the entire circumference. As a result, the bobbin 40 and the coil 20 can be accurately positioned. On the other hand, the first positioning mechanism 50 includes a guide portion 53 that relatively guides the first engagement portion 52 to the first lock portion 51 along the insertion direction D1 when the coil 20 is inserted into the bobbin 40. Therefore, when the coil 20 is inserted into the bobbin 40, positioning can be easily performed only by moving the coil 20 along the guide portion 53.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a wound component and a power supply device. [Background technology]

[0002] Conventionally, a known winding component includes a bobbin body that can be inserted inside the windings, a protruding portion that protrudes from the outer circumferential surface of the bobbin body and can be interposed between the windings, and a locking means that prevents the bobbin from rotating (for example, Patent Document 1). In this winding component, the protruding portion is dropped into a slit, and then the bobbin body is rotated to rotate the protruding portion, and the protruding portion is interposed between the windings and positioned. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-217311 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-described winding component has a problem in that it requires time and effort during manufacturing because the bobbin body is fixed and positioned relative to the coil by rotating it. On the other hand, if the time and effort during manufacturing is omitted, there is a possibility that the bobbin and the coil cannot be accurately positioned. Therefore, there has been a demand for a component that allows for easy manufacturing while accurately positioning the bobbin and the coil.

[0005] An object of the present disclosure is to provide a wound component and a power supply device that can be easily manufactured and that can accurately position a bobbin and a coil. [Means for solving the problem]

[0006] A wound component according to one embodiment of the present disclosure comprises a core, a flat coil provided relative to the core, a bobbin that houses the coil, and a first positioning mechanism and a second positioning mechanism for positioning between the bobbin and the coil, wherein the bobbin has an opening through which the coil can be inserted in the insertion direction during manufacture, the first positioning mechanism has a first locking portion provided on either the bobbin or the coil, and a first locking portion provided on the other that engages with the first locking portion, the second positioning mechanism has a second locking portion provided on either the bobbin or the coil, and a second locking portion provided on the other that engages with the second locking portion, the first positioning mechanism comprises a guide portion that guides the first locking portion relative to the first locking portion along the insertion direction when the coil is inserted into the bobbin, and the second positioning mechanism has a hole portion that receives the second locking portion as the second locking portion.

[0007] In a wound component according to one embodiment of the present disclosure, the first positioning mechanism includes a first locking portion provided on either the bobbin or the coil and a first engaging portion provided on the other of the bobbin and engaging with the first locking portion. Therefore, positioning is achieved by the first positioning mechanism when the first engaging portion engages with the first locking portion. The second positioning mechanism includes a second locking portion provided on either the bobbin or the coil and a second engaging portion provided on the other of the bobbin and engaging with the second locking portion. Therefore, positioning is achieved by the second positioning mechanism when the second engaging portion engages with the second locking portion. In this manner, positioning can be achieved at multiple locations using the first and second positioning mechanisms. Furthermore, the second positioning mechanism includes a hole as the second locking portion that receives the second engaging portion. By engaging the second engaging portion with the hole, the second positioning mechanism can restrict misalignment between the bobbin and the coil over the entire circumference. This allows accurate positioning of the bobbin and the coil. On the other hand, the first positioning mechanism includes a guide portion that guides the first engagement portion relative to the first locking portion along the insertion direction when inserting the coil into the bobbin. Therefore, when inserting the coil into the bobbin, positioning can be easily achieved by simply moving the coil along the guide portion. As a result, the bobbin and coil can be accurately positioned while enabling easy manufacturing.

[0008] The guide portion of the first positioning portion may have a groove shape extending in the insertion direction. In this case, the first locking portion is smoothly guided in the insertion direction along the groove shape of the guide portion. This makes it easier to insert the coil into the bobbin.

[0009] The first engagement portion may be located downstream of the second engagement portion in the insertion direction. In this case, when inserting the coil into the bobbin, the first engagement portion precedes the second engagement portion and is guided by the guide portion. As a result, not only is positioning by the first positioning mechanism smoother, but positioning by the second positioning mechanism can also be performed smoothly. Furthermore, the movement distance of the second engagement portion from when the bobbin and coil overlap at the second engagement portion until it reaches the hole in the second locking portion can be shortened. This reduces distortion of the bobbin and coil.

[0010] The first engagement portion may be at least one first protrusion provided on the coil and received in the second locking portion of the bobbin, and the second engagement portion may be a second protrusion provided on the coil and received in a hole serving as the second locking portion of the bobbin. In this way, since the first and second engagement portions are both first and second protrusions provided on the coil, guide portions and holes can be provided on the bobbin side, which has a high degree of freedom in shape. Furthermore, since the first engagement portion is a first protrusion, smooth guiding is possible with a simple structure. Since the second engagement portion is a second protrusion, smooth insertion into the hole of the second locking portion is possible. Therefore, the coil is easily inserted into the bobbin.

[0011] The first protrusion and the second protrusion are provided on one main surface of the coil, and the height of the first protrusion may be lower than that of the second protrusion. In this case, interference between the first protrusion and the structure near the second locking portion for engaging with the second protrusion can be suppressed. This makes it easier to insert the coil into the bobbin. Also, distortion of the bobbin and coil can be reduced.

[0012] The hole serving as the second locking portion may be positioned higher than the first locking portion that receives the first protrusion. In this case, it is possible to prevent the first protrusion from being erroneously inserted into the hole serving as the second locking portion. This makes it easier to insert the coil into the bobbin. Furthermore, by preventing interference between the first protrusion and the hole, it is possible to reduce distortion of the bobbin and the coil.

[0013] In a plan view, the diameter of the first protrusion may be larger than the diameter of the second protrusion. In this case, it is possible to prevent the coil from being inserted into the hole of the second locking portion by mistake. Therefore, it is easier to insert the coil into the bobbin.

[0014] The opening of the bobbin may have an inclined portion. In this case, the inclined portion smoothly guides the first and second engagement portions in the insertion direction at the opening of the bobbin. This makes it easier to insert the coil into the bobbin. Furthermore, smooth insertion reduces distortion of the bobbin and coil.

[0015] The first and second locking portions may be aligned parallel to the insertion direction. In this case, when inserting the coil into the bobbin, aligning the first and second locking portions so that they are aligned parallel to the insertion direction makes it easier to insert the coil into the bobbin.

[0016] The first positioning mechanism may have a slit that opens in the insertion direction as a guide portion, and the slit may have a tapered portion that widens toward the side where the first engagement portion is inserted. In this case, the tapered portion of the slit can receive the inserted first engagement portion and guide it to the first locking portion. This makes it easier to insert the coil into the bobbin. Furthermore, smooth insertion can reduce distortion of the bobbin and coil.

[0017] The bobbin may have a protruding receiving portion extending in the insertion direction on the opposite side of the opening in the insertion direction, and the coil may have a protruding piece extending in the insertion direction at its downstream end in the insertion direction, and the protruding piece may be received in the protruding receiving portion to restrict movement of the coil in a direction perpendicular to the insertion direction into the bobbin. In this case, when inserting the coil into the bobbin, the protruding piece can be inserted into the protruding receiving portion and the coil can be inserted while being guided by the protruding receiving portion. This makes it easier to insert the coil into the bobbin. In addition, the protruding piece can provide a heat dissipation function for the coil.

[0018] A power supply device according to an embodiment of the present disclosure includes the above-described wound component and a base plate that supports the wound component, and uses the wound component in a voltage conversion circuit.

[0019] According to this power supply device, the above-mentioned wound component can be suitably used in the power supply device.

[0020] The coil may have a protruding piece at its downstream end in the insertion direction, the protruding piece extending in the insertion direction, and the protruding piece may be thermally connected to the base plate. In this case, heat from the coil can be efficiently dissipated via the protruding piece and the base plate. [Effects of the Invention]

[0021] According to the present disclosure, it is possible to provide a wound component and a power supply device that can be easily manufactured and that allow accurate positioning of the bobbin and coil. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a side view illustrating a power supply device including a winding component according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view of a wound component according to an embodiment of the present disclosure. [Figure 3] FIG. [Figure 4] FIG. [Figure 5]FIG. 2 is a cross-sectional perspective view of the vicinity of a first locking portion and a first engaging portion. [Figure 6] FIG. 2 is a cross-sectional perspective view of the vicinity of a second locking portion and a second engaging portion. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 10 is an exploded perspective view showing a wound component according to a modified example. [Figure 9] FIG. 10 is an exploded perspective view showing a wound component according to a modified example. [Figure 10] FIG. 10 is an exploded perspective view showing a wound component according to a modified example. [Figure 11] FIG. 10 is an exploded perspective view showing a wound component according to a modified example. [Figure 12] FIG. 10 is an exploded perspective view showing a wound component according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Referring to FIG. 1, a power supply device 1 including a wound component 100 according to an embodiment of the present disclosure will be described. FIG. 1 is a side view showing the power supply device 1 including the wound component 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the power supply device 1 includes the wound component 100, a base plate 2, a substrate 3, and a lid 4. The power supply device 1 is configured by assembling the lid 4 to the base plate 2 that houses the substrate 3. A die-cast alloy or the like is used as a material for the base plate 2. The power supply device 1 is a unit that includes, for example, an AC / DC power supply, a DC / DC converter, and the like. The wound component 100 is provided within the power supply device 1. The base plate 2 supports the wound component 100 inside the power supply device 1. The power supply device 1 uses the wound component 100, for example, in a voltage conversion circuit. However, the overall shape of the power supply device 1 is not limited to that shown in FIG. 1. Furthermore, the position of the wound component 100 within the power supply device 1 is not particularly limited. The use of wound component 100 is not particularly limited, and it may be used for purposes other than voltage conversion circuits.

[0024] A wound component 100 according to an embodiment of the present disclosure will be described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view of the wound component 100 according to this embodiment of the present disclosure. FIG. 3 is an exploded perspective view of the wound component 100. FIG. 4 is a plan view of the wound component 100. In FIG. 4, cores 10A and 10B are shown in phantom lines. In the illustration, the X-axis and Y-axis directions are defined relative to the direction in which the bottom surface of the base plate 2 and the substrate 3 (see FIG. 1) extend. In the illustration, the Z-axis direction is defined relative to the thickness direction of the bottom surface of the base plate 2 and the substrate 3. In this specification, the upper side is defined as the positive side of the Z-axis direction, and the lower side is defined as the negative side of the Z-axis direction. In this specification, for convenience of explanation, terms such as "upper" and "lower" are sometimes used, but these terms do not limit the orientation of the power supply device 1 or the wound component 100 during use. In this embodiment, the coil 20 is inserted into the bobbin 40 during manufacturing. In this specification, the direction parallel to the insertion direction D1 is defined as the Y-axis direction, the downstream side of the insertion direction D1 is defined as the positive side in the Y-axis direction, and the upstream side is defined as the negative side in the Y-axis direction. As shown in Figures 2 to 4, wound component 100 includes cores 10A and 10B, coil 20, and bobbin 40.

[0025] Cores 10A and 10B are members made of a magnetic material. Core 10A is disposed below coil 20, and core 10B is disposed above coil 20. Cores 10A and 10B each include a protrusion 11 that is housed in a circular through-hole 20a formed in the center of coil 20, and protrusions 12 and 13 that are disposed on both ends of the outside of coil 20 in the X-axis direction (see FIG. 3). Cores 10A and 10B are configured as rectangular parallelepiped members that vertically sandwich portions of coil 20 and bobbin 40 near their central positions.

[0026] As shown in FIG. 3, the coil 20 is a flat conductor that is wound around the axis CL1 in an annular shape to form the spring portion 21. The coil 20 is made of a metal material such as copper. As described above, the coil 20 is provided on the cores 10A and 10B (see FIG. 2). The spring portion 21 has flat winding portions 22A, 22B, and 22C that are wound approximately one full turn. The winding portions 22A, 22B, and 22C are arranged in order from top to bottom, facing each other and spaced apart from each other in the vertical direction. The coil 20 has a central through-portion 20a on the inner circumferential side of the winding portions 22A, 22B, and 22C. The upper surface of the winding portion 22A forms the upper main surface 21a of the spring portion 21. The lower surface of the winding portion 22C forms the lower main surface 21b of the spring portion 21.

[0027] The topmost winding portion 22A and the second-highest winding portion 22B are electrically connected via a flat relay portion 23A. The second-highest winding portion 22B and the bottommost winding portion 22C are electrically connected via a flat relay portion 23B. The relay portions 23A and 23B are provided on the outer circumferential side of the spring portion 21, upstream of the winding portions 22A, 22B, and 22C in the insertion direction D1. As a result, the coil 20 has a spring portion 21 wound three times. The number of windings of the spring portion 21 is not limited and may be two, four, or more. The coil 20 has flat bus bars 24A and 24B extending from both ends of the winding of the spring portion 21. The bus bars 24A and 24B are provided on the outer circumferential side of the spring portion 21, upstream of the winding portions 22A, 22B, and 22C in the insertion direction D1.

[0028] As shown in FIG. 3, the bobbin 40 is a member that houses the coil 20. The bobbin 40 is made of a resin material. The bobbin 40 includes an upper wall portion 41, a lower wall portion 42, and a peripheral wall portion 43. The upper wall portion 41 is an annular flat plate member that covers the spring portion 21 from above. The lower wall portion 42 is an annular flat plate member that covers the spring portion 21 from below. The upper wall portion 41 and the lower wall portion 42 face each other while being spaced apart from each other in the vertical direction. Circular through-holes 40a are provided on the inner peripheries of the upper wall portion 41 and the lower wall portion 42, and are coaxial with the through-hole 20a of the coil 20. The protrusions 11 of the cores 10A and 10B are inserted into the through-holes 40a and the through-holes 20a. The peripheral wall portion 43 is a wall portion that extends in the vertical direction at the outer peripheries of the upper wall portion 41 and the lower wall portion 42. The peripheral wall portion 43 is provided on both end sides in the X-axis direction and on the downstream side in the insertion direction D1.

[0029] The internal space surrounded by the upper wall portion 41, the lower wall portion 42, and the peripheral wall portion 43 serves as a storage space for the spring portion 21. The bobbin 40 has an opening 44 that opens on the upstream side of the internal space in the insertion direction D1. The opening 44 is a portion into which the coil 20 can be inserted in the insertion direction D1 during manufacturing. Note that in the opening 44, the upstream edges of the upper wall portion 41 and the lower wall portion 42 in the insertion direction D1 are cut out so as to extend in a substantially straight line parallel to the X-axis direction.

[0030] The procedure for manufacturing the wound component 100 configured as described above will be described. First, the coil 20 is positioned so that the downstream portion of the coil 20 in the insertion direction D1 faces the opening 44 of the bobbin 40. The coil 20 is then moved (relatively) in the insertion direction D1 with respect to the bobbin 40. As a result, the coil 20 is accommodated in the internal space of the bobbin 40 through the opening 44. The coil 20 is inserted to a position where the through-hole 20a and the through-hole 40b of the bobbin 40 are substantially coaxial (see FIG. 4). Once the coil 20 is accommodated in the bobbin 40, the cores 10A and 10B are attached to the assembly. The protruding portions 11 of the cores 10A and 10B are inserted into the through-holes 20a and 40a, and the coil 20 and the bobbin 40 are sandwiched between the cores 10A and 10B from above and below. This completes the manufacturing of the wound component 100.

[0031] As shown in FIG. 4 , the wound component 100 includes a first positioning mechanism 50 and a second positioning mechanism 70. The first and second positioning mechanisms 50, 70 are mechanisms for positioning the bobbin 40 and the coil 20. The first positioning mechanism 50 includes a first locking portion 51 provided on one of the bobbin 40 and the coil 20, and a first engaging portion 52 provided on the other. The first locking portion 51 is a portion that receives the first engaging portion 52 when positioning is complete. The first engaging portion 52 is a portion that engages with the first locking portion 51 when positioning is complete. The second positioning mechanism 70 includes a second locking portion 71 provided on one of the bobbin 40 and the coil 20, and a second engaging portion 72 provided on the other. The second locking portion 71 is a portion that receives the second engaging portion 72 when positioning is complete. The second engaging portion 72 is a portion that engages with the second locking portion 71 when positioning is complete.

[0032] In the present embodiment, the bobbin 40 is provided with a first locking portion 51, the coil 20 is provided with a first engaging portion 52, the bobbin 40 is provided with a second locking portion 71, and the coil 20 is provided with a second engaging portion 72. However, the combination is not limited to this. For example, the bobbin 40 may be provided with a first locking portion 51, the coil 20 may be provided with a first engaging portion 52, the coil 20 may be provided with a second locking portion 71, and the bobbin 40 may be provided with a second engaging portion 72. The coil 20 may be provided with a first locking portion 51, the bobbin 40 may be provided with a first engaging portion 52, the bobbin 40 may be provided with a second locking portion 71, and the coil 20 may be provided with a second engaging portion 72. The coil 20 may be provided with a first locking portion 51, the bobbin 40 may be provided with a first engaging portion 52, the coil 20 may be provided with a second locking portion 71, and the bobbin 40 may be provided with a second engaging portion 72.

[0033] The first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 are arranged at different positions in the circumferential direction around the axis CL1 of the coil 20. In this embodiment, the first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 are arranged at positions that form 180° with each other around the axis CL1. Furthermore, the first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 are arranged downstream in the insertion direction D1, and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 are arranged upstream in the insertion direction D1. In a plan view, a reference line SL1 is set that passes through the axis CL1 and is parallel to the insertion direction D1. In this case, the first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 are disposed on the reference line SL1 in a plan view. However, the angle formed by the first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 about the axis CL1 is not particularly limited, and they may be disposed anywhere as long as it is possible to prevent misalignment between the bobbin 40 and the coil 20 after manufacturing is completed. Furthermore, even when the first locking portion 51 and the first engaging portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engaging portion 72 of the second positioning mechanism 70 form an angle of 180° with each other about the axis CL1, they do not necessarily have to be disposed on the reference line SL1.

[0034] Furthermore, the first positioning mechanism 50 includes a guide portion 53 that guides the first engagement portion 52 relative to the first locking portion 51 along the insertion direction D1 when the coil 20 is inserted into the bobbin 40. When the first locking portion 51 is provided on the bobbin 40 and the first engagement portion 52 is provided on the coil 20, the guide portion 53 is provided on the bobbin 40 in a region upstream of the first locking portion 51 in the insertion direction D1. This allows the first engagement portion 52 of the coil 20 to move toward the first locking portion 51 located downstream in the insertion direction D1 while being guided by the guide portion 53 of the bobbin 40 when the coil 20 is inserted into the bobbin 40. When the first locking portion 51 is provided on the coil 20 and the first engagement portion 52 is provided on the bobbin 40, the guide portion 53 is provided on the coil 20 in a region downstream of the first locking portion 51 in the insertion direction D1 (see, for example, FIG. 12 ). As a result, when the coil 20 is inserted into the bobbin 40, the first engagement portion 52 of the bobbin 40 can move toward the first locking portion 51 located upstream in the insertion direction D1 while being guided by the guide portion 53 of the coil 20. In this embodiment, the first locking portion 51 and the first engagement portion 52 of the first positioning mechanism 50 and the second locking portion 71 and the second engagement portion 72 of the second positioning mechanism 70 are arranged on the reference line SL1 in a plan view. Therefore, the guide portion 53 is also arranged on the reference line SL1 in a plan view.

[0035] Next, the first positioning mechanism 50 and the second positioning mechanism 70 will be described in more detail with reference to Fig. 5 to Fig. 7 in addition to Fig. 4. Fig. 5 is a cross-sectional perspective view of the vicinity of the first locking portion 51 and the first engaging portion 52. Fig. 6 is a cross-sectional perspective view of the vicinity of the second locking portion 71 and the second engaging portion 72. Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 4.

[0036] As shown in FIG. 5, the first engagement portion 52 is at least one first protrusion 54 that is provided on the coil 20 and is received in the first locking portion 51 of the bobbin 40. The first protrusion 54 protrudes upward from the upper main surface 21a of the uppermost winding portion 22A. The first protrusion 54 is located on the main surface 21a of the winding portion 22A downstream of the axis CL1 in the insertion direction D1 and on the reference line SL1 (see FIG. 4). Note that a plurality of first protrusions 54 may be formed.

[0037] As shown in FIG. 4, the first positioning portion 50 has a first guide portion 53A and a second guide portion 53B provided on the bobbin 40. The first guide portion 53A is a guide portion 53 provided downstream of the through-hole 40a in the insertion direction D1, and the second guide portion 53B is a guide portion 53 provided upstream of the through-hole 40a in the insertion direction D1. The first and second guide portions 53A and 53B have a groove shape extending in the insertion direction D1. The groove shape has a pair of side surfaces spaced apart from each other in the X-axis direction perpendicular to the insertion direction D1, and the pair of side surfaces extend along the insertion direction D1. The groove shape includes a structure in which the upper sides of the pair of side surfaces are closed by an upper wall (for example, a guide groove 61 described below) and a structure in which the upper surfaces of the pair of side surfaces are open and not closed (for example, a slit 56 described below). The first guide portion 53A and the second guide portion 53B are aligned parallel to the insertion direction D1 and extend parallel to the insertion direction D1. The first guide portion 53A and the second guide portion 53B are disposed on a reference line SL1 in a plan view. The locking portions 51, 71 and the engaging portions 52, 72 are each provided on either the first guide portion 53A or the second guide portion 53B.

[0038] As shown in FIG. 5, the first guide portion 53A has a slit 56 that opens in the insertion direction D1. The slit 56 is formed at the downstream end of the inner peripheral edge 41a of the upper wall portion 41 of the bobbin 40 in the insertion direction D1. In a plan view, the slit 56 is configured as a substantially U-shaped notch extending from the inner peripheral edge 41a along the insertion direction D1 (see FIG. 4). The slit 56 penetrates the upper wall portion 41 in the up-down direction. The slit 56 has a pair of side surfaces 57, 57 that face each other in the X-axis direction and a bottom portion 58 that is located on the most downstream side in the insertion direction D1. As described above, the slit 56 has a groove shape in which the side surfaces 57, 57 that face each other in the X-axis direction extend in the insertion direction D1. The pair of side surfaces 57, 57 are connected to each other at the bottom portion 58. The slit 56 has a tapered portion 59 that widens toward the side where the first protrusion 54 is inserted, i.e., toward the upstream side in the insertion direction D1. In the tapered portion 59, the distance between the pair of side surfaces 57 increases from the downstream side to the upstream side in the insertion direction D1.

[0039] Of the slit 56, an area near the bottom 58 on the downstream side in the insertion direction D1 is configured as the first locking portion 51. A pair of side surfaces 57 serving as the first locking portion 51 receive the first protruding portion 54 so as to sandwich it from both sides in the X-axis direction. Therefore, the pair of side surfaces 57 of the first locking portion 51 restrict movement of the first protruding portion 54 to both sides in the X-axis direction.

[0040] 4, the upper wall portion 41 of the bobbin 40 has a flat plate portion 60 provided at the center of the opening 44 in the X-axis direction. The flat plate portion 60 is thicker than other portions of the upper wall portion 41 and extends further upstream in the insertion direction D1 than the linear edge of the opening 44. The flat plate portion 60 is located upstream in the insertion direction D1 than the cores 10A and 10B.

[0041] As shown in FIG. 6 , the second guide portion 53B has a guide groove 61 formed in the lower surface of the flat plate portion 60. The guide groove 61 has a shape that is recessed upward from the lower surface of the flat plate portion 60. The guide groove 61 has a pair of side surfaces 62, 62 that face each other in the X-axis direction, and an upper surface 63. The guide groove 61 is formed over the entire area of ​​the flat plate portion 60 in the insertion direction D1. Therefore, during manufacturing, the first protrusion 54 is inserted into the guide groove 61 from the upstream end of the flat plate portion 60 in the insertion direction D1, and is guided in the insertion direction D1 by the guide groove 61 and exits from the downstream end of the flat plate portion 60 in the insertion direction D1.

[0042] The flat plate portion 60 has a hole 73 at the position of the guide groove 61. The hole 73 penetrates from the upper surface 63 of the guide groove 61 to the upper surface of the flat plate portion 60. The second positioning mechanism 70 has a hole 73 as a second locking portion 71 that receives a second engagement portion 72. The hole 73 restricts the movement of the accommodated second engagement portion 72 in all directions, including both sides of the insertion direction D1 and both sides of the X-axis direction. However, the hole 73 may be a recess that does not penetrate all the way to the upper surface as long as it can receive the second engagement portion 72.

[0043] The second engagement portion 72 is a second protrusion 74 that is provided on the coil 20 and is received in a hole 73 serving as a second locking portion 71 of the bobbin 40. The second protrusion 74 protrudes upward from the main surface 21a of the uppermost winding portion 22A. The second protrusion 74 is located on the main surface 21a of the winding portion 22A, upstream of the axis CL1 in the insertion direction D1, and on the reference line SL1 (see FIG. 4).

[0044] In this embodiment, the first protrusion 54 and the second protrusion 74 have a cylindrical shape. However, the shapes of the first protrusion 54 and the second protrusion 74 are not particularly limited, and may be polygonal prisms such as quadrangular prisms, or may be cones, polygonal pyramids, truncated cones, truncated polygonal pyramids, etc.

[0045] With the above-described arrangement, the first protrusion 54, which is the first engagement portion 52, is located downstream in the insertion direction D1 of the second protrusion 74, which is the second engagement portion 72. Similarly, the first locking portion 51 is located downstream in the insertion direction D1 of the hole 73, which is the second locking portion 71. Furthermore, the first locking portion 51 and the hole 73, which is the second locking portion 72, are aligned parallel to the insertion direction D1. Similarly, the first protrusion 54, which is the first engagement portion 52, and the second protrusion 74, which is the second engagement portion 72, are aligned parallel to the insertion direction D1.

[0046] As shown in FIG. 7 , the height of the first protrusion 54 is lower than that of the second protrusion 74. The hole 73 serving as the second locking portion 71 is positioned higher than the first locking portion 51 that receives the first protrusion 54. Specifically, the upper surface 63 of the guide groove 61 of the second guide portion 53B is positioned higher than, at the same level as, or slightly lower than the upper surface of the first protrusion 54. Therefore, when the first protrusion 54 is guided by the guide groove 61, the first protrusion 54 does not come into contact with the upper surface 63 of the guide groove 61, and even if it does come into contact, its movement is not hindered. The first protrusion 54 also does not fit into the hole 73 of the second locking portion 71. Meanwhile, the slit 56 having the first locking portion 51 is positioned lower than the hole 73 of the second locking portion 71, allowing the first protrusion 54 to engage with the first locking portion 51. The second protrusion 74 extends to a position higher than the guide groove 64. Therefore, it fits into the hole 73 of the second locking portion 71. The diameter of the first protrusion 54 is larger than the diameter of the second protrusion 74 in a plan view.

[0047] An inclined portion 66 is formed at the opening 44 of the bobbin 40. The inclined portion 66 is formed at the upstream end of the guide groove 61 of the flat portion 60 in the insertion direction D1. The inclined portion 66 is formed by the upper surface 63 of the guide groove 61 moving upward as it moves toward the upstream side in the insertion direction D1. The inclined portion 66 guides the second protrusion 74 so that it smoothly slides under the flat portion 60 when the coil 20 is inserted.

[0048] As shown in FIG. 4, the bobbin 40 has a protrusion receiving portion 47 extending in the insertion direction D1 on the opposite side of the opening 44 in the insertion direction D1. The protrusion receiving portion 47 protrudes from the peripheral wall portion 43 on the downstream side in the insertion direction D1 toward the downstream side in the insertion direction D1. The coil 20 has a plate-shaped protrusion portion 26 extending in the insertion direction D1 at its downstream end in the insertion direction D1 (see FIG. 3). The coil 20 has three protrusion portions 26 protruding from each of the winding portions 22A, 22B, and 22C. Therefore, the bobbin 40 has three protrusion receiving portions 47. The protrusion receiving portion 47 has an upper wall portion 47a and a pair of side wall portions 47b, 47b. The pair of side wall portions 47b, 47b support the protrusion portion 26 from both sides in the X-axis direction. Therefore, by receiving the protruding piece portion 26 in the protruding receiving portion 47, movement of the coil 20 in the X-axis direction perpendicular to the insertion direction D1 into the bobbin 40 is restricted. Furthermore, the protruding receiving portion 47 can guide the coil 20 via the protruding piece portion 26 when inserting the coil 20 into the bobbin 40. In this way, the protruding receiving portion 47 can also function as a first locking portion 51 and a guide portion 53. Furthermore, the protruding piece portion 26 functions as a first engaging portion 52.

[0049] 5 and 7, the protrusion receiving portion 47 does not have a wall portion on the underside. Therefore, the protruding piece 26 is exposed on the underside. As shown in FIG. 7, the base plate 2 comes into contact with the protruding piece 26 exposed from the protrusion receiving portion 47. As a result, the protruding piece 26 is thermally connected to the base plate 2. Heat from the coil 20 is dissipated via the protruding piece 26 and the base plate 2.

[0050] Next, the functions and effects of winding component 100 and power supply device 1 according to this embodiment will be described.

[0051] In the wound component 100 according to this embodiment, the first positioning mechanism 50 has a first locking portion 51 provided on either the bobbin 40 or the coil 20, and a first engaging portion 52 provided on the other of the bobbin 40 or the coil 20 that engages with the first locking portion 51. Therefore, positioning is achieved by the first positioning mechanism 50 when the first engaging portion 52 engages with the first locking portion 51. The second positioning mechanism 70 has a second locking portion 71 provided on either the bobbin 40 or the coil 20, and a second engaging portion 72 provided on the other of the bobbin 40 or the coil 20 that engages with the second locking portion 71. Therefore, positioning is achieved by the second positioning mechanism 70 when the second engaging portion 72 engages with the second locking portion 71. In this manner, positioning can be achieved at multiple locations using the first and second positioning mechanisms 50, 70. Furthermore, the second positioning mechanism 70 has a hole 73, as the second locking portion 71, that receives the second engaging portion 72. By engaging the second engaging portion 72 with the hole portion 73, the second positioning mechanism 70 can restrict misalignment between the bobbin 40 and the coil 20 over the entire circumference. This allows the bobbin 40 and the coil 20 to be accurately positioned. Meanwhile, the first positioning mechanism 50 includes a guide portion 53 that guides the first engaging portion 52 relative to the first locking portion 51 along the insertion direction D1 when the coil 20 is inserted into the bobbin 40. Therefore, when inserting the coil 20 into the bobbin 40, positioning can be easily achieved by simply moving the coil 20 along the guide portion 53. As described above, the bobbin 40 and the coil 20 can be accurately positioned while enabling easy manufacturing.

[0052] The guide portion 53 of the first positioning portion 50 may have a groove shape extending in the insertion direction D1. In this case, the first locking portion 51 is smoothly guided in the insertion direction D1 along the groove shape of the guide portion 53. This makes it easier to insert the coil 20 into the bobbin 40.

[0053] The first engagement portion 52 may be provided downstream of the second engagement portion 72 in the insertion direction D1. In this case, when inserting the coil 20 into the bobbin 40, the first engagement portion 52 precedes the second engagement portion 72 and is guided by the guide portion 53. As a result, not only is positioning by the first positioning mechanism 50 smoother, but positioning by the second positioning mechanism 70 can also be performed smoothly. Furthermore, the movement distance of the second engagement portion 72 from when the bobbin 40 and the coil 20 overlap at the second engagement portion 72 until the second engagement portion 72 reaches the hole 73 of the second locking portion 71 can be made shorter (than the first engagement portion 52). This makes it possible to reduce distortion of the bobbin 40 and the coil 20.

[0054] The first engagement portion 52 may be at least one first protrusion 54 provided on the coil 20 and received in the first locking portion 51 of the bobbin 40, and the second engagement portion 72 may be a second protrusion 74 provided on the coil 20 and received in a hole 73 serving as the second locking portion 71 of the bobbin 40. Because the first and second engagement portions 52, 72 are both first and second protrusions 54, 74 provided on the coil 20, the guide portion 53 and hole 73 can be provided on the bobbin 40, which has a high degree of freedom in shape. Furthermore, since the first engagement portion 52 is the first protrusion 54, smooth guiding is possible with a simple structure. Since the second engagement portion 72 is the second protrusion 74, smooth insertion into the hole 73 of the second locking portion 71 is possible. This facilitates insertion of the coil 20 into the bobbin 40.

[0055] The first protrusion 54 and the second protrusion 74 are provided on one main surface 21a of the coil 20, and the height of the first protrusion 54 may be lower than the height of the second protrusion 74. In this case, it is possible to prevent the first protrusion 54 from interfering with the structure near the second locking portion 71 for engaging with the second protrusion 74. This makes it easier to insert the coil 20 into the bobbin 40. In addition, distortion of the bobbin 40 and the coil 20 can be reduced.

[0056] The hole 73 serving as the second locking portion 71 may be positioned higher than the first locking portion 51 that receives the first protrusion 54. In this case, it is possible to prevent the first protrusion 54 from being erroneously inserted into the hole 73 serving as the second locking portion 71. This makes it easier to insert the coil 20 into the bobbin 40. Furthermore, by preventing interference between the first protrusion 54 and the hole 73, it is possible to reduce distortion of the bobbin 40 and the coil 20.

[0057] In a plan view, the diameter of the first protrusion 54 may be larger than the diameter of the second protrusion 74. In this case, it is possible to prevent the coil 20 from being erroneously inserted into the hole 73 of the second locking portion 71. Therefore, it becomes easier to insert the coil 20 into the bobbin 40.

[0058] The opening 44 of the bobbin 40 may be formed with an inclined portion 66. In this case, the first and second engagement portions 52, 72 are smoothly guided in the insertion direction D1 by the inclined portion 66 at the opening 44 of the bobbin 40. This makes it easier to insert the coil 20 into the bobbin 40. Furthermore, smooth insertion can reduce distortion of the bobbin 40 and the coil 20.

[0059] The first locking portion 51 and the second locking portion 71 may be aligned parallel to the insertion direction D1. In this case, when inserting the coil 20 into the bobbin 40, the first locking portion 51 and the second locking portion 71 are aligned parallel to the insertion direction D1 before insertion, which makes it easier to insert the coil 20 into the bobbin 40.

[0060] The first positioning mechanism 50 has a slit 56 that opens in the insertion direction D1 as the guide portion 53, and the slit 56 may have a tapered portion 59 that widens toward the side where the first engagement portion 52 is inserted. In this case, the tapered portion 59 of the slit 56 can receive the inserted first engagement portion 52 and guide it to the first locking portion 51. This makes it easier to insert the coil 20 into the bobbin 40. Furthermore, smooth insertion can reduce distortion of the bobbin 40 and the coil 20.

[0061] The bobbin 40 has a protrusion receiving portion 47 extending in the insertion direction D1 on the side opposite the opening 44 in the insertion direction D1, and the coil 20 has a protrusion piece 26 extending in the insertion direction D1 at its downstream end in the insertion direction D1, and the protrusion piece 26 is received in the protrusion receiving portion 47, thereby restricting movement of the coil 20 in a direction perpendicular to the insertion direction D1 relative to the bobbin 40. In this case, when inserting the coil 20 into the bobbin 40, the coil 20 can be inserted while being guided by the protrusion receiving portion 47 with the protrusion piece 26 inserted into the protrusion receiving portion 47. This makes it easier to insert the coil 20 into the bobbin 40. In addition, the protrusion piece 26 can provide a heat dissipation function for the coil 20.

[0062] The power supply device 1 according to this embodiment includes the above-described wound component 100 and a base plate 2 that supports the wound component 100, and uses the wound component 100 in a voltage conversion circuit.

[0063] According to this power supply device 1, the above-described wound component 100 can be suitably used in the power supply device 1.

[0064] The coil 20 has a protruding piece 26 extending in the insertion direction D1 at the downstream end in the insertion direction D1, and the protruding piece 26 may be thermally connected to the base plate 2. In this case, heat from the coil 20 can be suitably dissipated via the protruding piece 26 and the base plate 2.

[0065] The present disclosure is not limited to the above-described embodiments.

[0066] For example, the configuration shown in FIG. 8 may be employed. Coil 20 of wound component 100 shown in FIG. 8 has winding portions 22A and 22C, each having two turns. Winding portions 22A and 22C are connected via relay portion 23. Upper wall portion 41 and lower wall portion 42 of bobbin 40 are generally annular flat plate members. In the configuration shown in FIG. 8, the structure around second guide portion 53B differs from that of the above-described embodiment. In the configuration shown in FIG. 8, guide groove 61 of second guide portion 53B includes a pair of side wall portions 77, 77 rising upward, and an upper wall portion 78 closing the upper sides of the side wall portions 77, 77. In addition, first guide portion 53A includes guide groove 67. Guide groove 67 includes a pair of side wall portions 68, 68 rising upward, and an upper wall portion 69 closing the upper sides of the side wall portions 68, 68. The pair of side walls 68, 68 of the guide groove 67 form the first locking portion 51.

[0067] The configuration shown in FIG. 9 may also be employed. The bobbin 40 of the wound component 100 shown in FIG. 9 has a slit 56 as a first guide portion 53A. The bobbin 40 also has a slit 81 as a second guide portion 53B. The slit 81 penetrates from the outer peripheral edge to the inner peripheral edge at the upstream end of the upper wall portion 69 in the insertion direction D1. Therefore, during manufacturing, the first protrusion 54 can move downstream in the insertion direction D1 while being guided by the slit 81. Here, the hole 73 of the second locking portion 71 cannot be formed in the slit 81. Therefore, the hole 73 of the second locking portion 71 is formed in the lower wall portion 42. Accordingly, the second protrusion 74 of the second engagement portion 72 of the coil is formed on the lower main surface 21b of the lower winding portion 22C. In this way, the second locking portion 71 and the second engagement portion 72 may be positioned away from the guide portion 53.

[0068] The configuration shown in FIG. 10 may also be employed. The bobbin 40 of the wound component 100 shown in FIG. 10 does not have a groove-shaped guide portion 53, and does not have a first guide portion 53A or a second guide portion 53B. The bobbin 40 also does not have a first locking portion 51 provided in the groove-shaped guide portion 53. Accordingly, the coil 20 does not have a first protrusion 54 as the first engagement portion 52. Instead, the bobbin 40 has peripheral wall portions 43, 43 on both sides in the X-axis direction function as the guide portion 53 and the first locking portion 51. The coil 20 has guided portions 82, 82 that protrude outward from both sides in the X-axis direction of the winding portions 22A, 22C function as the first engagement portion 52. The guided portions 82, 82 have edges that are parallel to the insertion direction D1. During manufacturing, when the coil 20 is inserted into the bobbin 40 through the opening 44, the guided portions 82 of the coil 20 are sandwiched between the peripheral wall portions 43 from both sides in the X-axis direction, and are inserted into the bobbin 40 while being guided in the insertion direction D1 by the peripheral wall portions 43. After the insertion is complete, the movement of the guided portions 82 of the coil 20 in the X-axis direction is restricted by the peripheral wall portions 43. Note that, because the second guide portion 53B is not provided, the hole 73 of the second locking portion 71 is provided in the upper wall portion 41. This structure is effective when it is not desired to drill holes or the like in the winding portions 22A and 22B of the coil 20.

[0069] The configuration shown in FIG. 11 may also be employed. In the configuration shown in FIG. 11, the protrusion receiving portion 47 of the bobbin 40 functions as the first locking portion 51 and the guide portion 53. The protrusion piece 26 of the coil 20 functions as the first engaging portion 52. A pair of protrusion receiving portions 47 is provided on both sides of the downstream end of the upper wall portion 41 in the insertion direction D1 in the X-axis direction. A pair of protrusion piece 26 is provided on both sides of the downstream end of the upper winding portion 22A in the insertion direction D1 in the X-axis direction. The other structures are similar to the protrusion receiving portion 47 and the protrusion piece 26 of the above-described embodiment. Therefore, heat can be dissipated by thermally connecting the base plate 2 to the underside of the protrusion piece 26. This structure is effective when it is not necessary to drill holes or the like in the winding portions 22A and 22B of the coil 20 and when providing a heat dissipation effect to the base plate 2.

[0070] The configuration shown in FIG. 12 may also be employed. In the configuration shown in FIG. 12, the coil 20 has a first locking portion 51 and a guide portion 53, and the bobbin 40 has a first engagement portion 52. A slit 84 provided in the coil 20 functions as the guide portion 53 and the first locking portion 51. The slit 84 is provided at the downstream end of the winding portion 22A in the insertion direction D1. The slit 84 extends from the outer peripheral edge of the winding portion 22A to the upstream side in the insertion direction D1. A protrusion 85 provided in the bobbin 40 functions as the first engagement portion 52. The protrusion 85 is provided in a region of the lower surface of the upper wall portion 41 that is downstream in the insertion direction D1. The protrusion 85 protrudes downward from the lower surface of the upper wall portion 41. When the coil 20 is inserted into the bobbin 40 through the opening 44 in the insertion direction D1, the protrusion 85 fits into the slit 84. As a result, protrusion 85 moves relatively toward first locking portion 51 while being guided by slit 84. After the manufacturing is completed, movement of protrusion 85 in the X-axis direction is restricted by the side surfaces on both sides of slit 84. Such a structure is effective when it is necessary to avoid providing a protrusion on winding portion 22A.

[0071] In the above-described embodiment, the locking portions, engaging portions, and guide portions are provided in areas that do not overlap with the cores 10A and 10B, but they may be provided in areas that overlap with the cores 10A and 10B. In this case, it is only necessary to ensure an insulating distance between the cores 10A and 10B and the structure.

[0072] A hole 73 of the second locking portion 71 may be provided in the coil 20, and a second protrusion 74 of the second engagement portion 72 may be provided in the bobbin 40. In this case, in order to prevent a reduction in the volume of the winding portion from affecting the coil characteristics, a piece may be provided that extends outward from the winding portion, and the hole 73 may be provided in this piece.

[0073] [Form 1] The core and a flat coil provided around the core; a bobbin that accommodates the coil; a first positioning mechanism and a second positioning mechanism for positioning the bobbin and the coil, the bobbin has an opening into which the coil can be inserted in an insertion direction during manufacturing; the first positioning mechanism has a first locking portion provided on one of the bobbin and the coil, and a first engaging portion provided on the other of the bobbin and the coil, the first engaging portion engaging with the first locking portion; the second positioning mechanism has a second locking portion provided on one of the bobbin and the coil, and a second engaging portion provided on the other of the bobbin and the coil, the second locking portion engaging with the second locking portion; the first positioning mechanism includes a guide portion that guides the first engagement portion relative to the first locking portion along the insertion direction when the coil is inserted into the bobbin, The second positioning mechanism has a hole portion as the second locking portion that receives the second engaging portion. [Form 2] The wound component according to aspect 1, wherein the guide portion of the first positioning portion has a groove shape extending in the insertion direction. [Form 3] The wound component according to aspect 1 or 2, wherein the first engagement portion is provided downstream of the second engagement portion in the insertion direction. [Form 4] the first engagement portion is at least one first protrusion provided on the coil and received in the second locking portion of the bobbin; The wound component according to any one of the first to third aspects, wherein the second engagement portion is a second protrusion provided on the coil and received in the hole serving as the second locking portion of the bobbin. [Form 5] the first protrusion and the second protrusion are provided on one main surface side of the coil, The wound component according to aspect 4, wherein the height of the first protrusion is lower than that of the second protrusion. [Form 6] The wound component according to aspect 5, wherein the hole serving as the second locking portion is positioned higher than the first locking portion that receives the first protrusion. [Form 7] 7. The wound component according to any one of embodiments 4 to 6, wherein, in a plan view, the diameter of the first protruding portion is larger than the diameter of the second protruding portion. [Form 8] The wound component according to any one of the first to seventh embodiments, wherein the opening of the bobbin is formed with an inclined portion. [Form 9] The wound component according to any one of the first to eighth embodiments, wherein the first locking portion and the second locking portion are aligned parallel to the insertion direction. [Form 10] the first positioning mechanism has a slit as the guide portion, the slit being open in the insertion direction; The wound component according to any one of the first to ninth embodiments, wherein the slit has a tapered portion that widens toward a side where the first engaging portion is inserted. [Form 11] the bobbin has a protruding receiving portion extending in the insertion direction on a side opposite to the opening in the insertion direction, the coil has a protruding piece extending in the insertion direction at a downstream end in the insertion direction, The wound component according to any one of the first to tenth embodiments, wherein the protruding piece is received in the protruding receiving portion, thereby restricting movement of the coil in a direction perpendicular to the insertion direction relative to the bobbin. [Form 12] The wound component according to any one of aspects 1 to 11, a base plate that supports the winding component, A power supply device using the wound component in a voltage conversion circuit. [Form 13] the coil has a protruding piece extending in the insertion direction at a downstream end in the insertion direction, 13. The power supply device according to claim 12, wherein the protruding piece is thermally connected to the base plate. [Explanation of symbols]

[0074] 1...power supply unit, 2...base plate, 20...coil, 26...protruding piece portion, 40...bobbin, 44...opening, 47...protruding receiving portion, 50...first positioning mechanism, 51...first locking portion, 52...first engaging portion, 53...guide portion, 54...first protruding portion, 56...slit, 59...tapered portion, 66...inclined portion, 70...second positioning mechanism, 71...second locking portion, 72...second engaging portion, 73...hole portion, 74...second protruding portion, 100...winding part.

Claims

1. The core and a flat coil provided around the core; a bobbin that accommodates the coil; a first positioning mechanism and a second positioning mechanism for positioning the bobbin and the coil, the bobbin has an opening into which the coil can be inserted in an insertion direction during manufacturing; the first positioning mechanism has a first locking portion provided on one of the bobbin and the coil, and a first engaging portion provided on the other of the bobbin and the coil, the first engaging portion engaging with the first locking portion; the second positioning mechanism has a second locking portion provided on one of the bobbin and the coil, and a second engaging portion provided on the other of the bobbin and the coil, the second locking portion engaging with the second locking portion; the first positioning mechanism includes a guide portion that guides the first engaging portion relative to the first locking portion along the insertion direction when the coil is inserted into the bobbin, The second positioning mechanism has a hole portion that receives the second engagement portion as the second locking portion.

2. The wound component according to claim 1 , wherein the guide portion of the first positioning portion has a groove shape extending in the insertion direction.

3. The wound component according to claim 1 , wherein the first engaging portion is provided downstream of the second engaging portion in the insertion direction.

4. the first engagement portion is at least one first protrusion provided on the coil and received in the second locking portion of the bobbin; The wound component according to claim 1 , wherein the second engaging portion is a second protruding portion provided on the coil and received in the hole serving as the second locking portion of the bobbin.

5. the first protrusion and the second protrusion are provided on one main surface side of the coil, The wound component according to claim 4 , wherein the height of the first protrusion is lower than that of the second protrusion.

6. The wound component according to claim 5 , wherein the hole serving as the second locking portion is positioned higher than the first locking portion that receives the first protrusion.

7. The wound component according to claim 4 , wherein a diameter of the first protruding portion is larger than a diameter of the second protruding portion in a plan view.

8. The wound component according to claim 1 , wherein the opening of the bobbin is formed with a sloped portion.

9. The wound component according to claim 1 , wherein the first locking portion and the second locking portion are aligned parallel to the insertion direction.

10. the first positioning mechanism has a slit as the guide portion, the slit being open in the insertion direction; The winding component according to claim 1 , wherein the slit has a tapered portion that widens toward a side where the first engaging portion is inserted.

11. the bobbin has a protruding receiving portion extending in the insertion direction on a side opposite to the opening in the insertion direction, the coil has a protruding piece extending in the insertion direction at a downstream end in the insertion direction, The wound component according to claim 1 , wherein the projection is received in the projection receiving portion, thereby restricting movement of the coil relative to the bobbin in a direction perpendicular to the insertion direction.

12. A wound component according to any one of claims 1 to 11; a base plate that supports the winding component, A power supply device using the wound component in a voltage conversion circuit.

13. the coil has a protruding piece extending in the insertion direction at a downstream end in the insertion direction, The power supply device according to claim 12 , wherein the protruding piece is thermally connected to the base plate.

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