Plate-shaped coil and coil device

Abstract

To provide a plate-like coil and a coil device with excellent heat dissipation.SOLUTION: A plate-like coil includes a flat coil body portion 12a, a lead portion 14a drawn out from the coil body portion 12a, and a heat dissipation portion 18 that intersects at a predetermined angle with respect to the coil body portion 12a at a position different from pull-out positions 15a2, 16a2 of the lead portion 14a of the coil body portion 12a.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a plate-shaped coil and a coil device.

Background Art

[0002] As a transformer used for applications with large current and large output, a coil device having a plate-shaped coil is known (Patent Document 1).

[0003] However, in a transformer such as Patent Document 1, when a larger current flows, heat generated particularly on the high-voltage side accumulates.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above circumstances, the present invention has been made, and an object thereof is to provide a plate-shaped coil and a coil device having excellent heat dissipation properties.

Means for Solving the Problems

[0006] To achieve the above object, the plate-shaped coil according to the present invention has a flat coil body portion, a lead portion drawn from the coil body portion, and a heat dissipation portion that intersects the coil body portion at a predetermined angle at a position different from the lead portion drawing position of the coil body portion.

[0007] By configuring in this way, the heat generated in the plate-shaped coil can be dissipated through the heat dissipation portion, and the heat dissipation property of the plate-shaped coil is improved.

[0008] Also, to achieve the above object, the coil device according to the present invention A plate-shaped coil according to claim 1, A case in which the plate-shaped coil is housed, The case comprises a heat-dissipating resin filled inside the case.

[0009] In such a coil device, the plate-shaped coil is covered by a case and immersed in a heat-dissipating resin. As a result, the heat generated by the plate-shaped coil is easily transferred from the heat-dissipating section to the case via the heat-dissipating resin. This heat dissipation through the case improves the heat dissipation performance of the coil device. The case may be made of metal, resin, or a composite material thereof. An insulating case made of resin or the like may be positioned in contact with the plate-shaped coil to allow heat to be dissipated directly from the heat-dissipating section to the case.

[0010] The coil device comprises a bobbin on which the plate-shaped coil is arranged, and a core positioned on the winding axis of the plate-shaped coil, and the case may have an opening that opens to the side.

[0011] Even if the coil device has a core, the heat generated in the core can be dissipated to the outside of the case. Furthermore, in addition to plate-shaped coils, it is also possible to form, for example, wire windings on the bobbin of the coil device.

[0012] If the case has an opening that faces to the side, the lead portion can be pulled out of the case from the side through the opening, eliminating the need to pull the lead portion out from the top of the case. Therefore, it is not necessary to make the top of the bobbin protrude out of the case for positioning purposes, and the height of the bobbin can be reduced accordingly, resulting in a lower profile coil device.

[0013] The coil device comprises a bobbin on which the plate-shaped coil is arranged, and a core positioned on the winding axis of the plate-shaped coil, and the case may have an opening that opens upward.

[0014] The heat dissipation section may be positioned on the opposite side of the coil body from the lead section.

[0015] This configuration allows the heat generated by the plate-shaped coil to be more effectively released from the coil device.

[0016] The heat dissipation section may be arranged at intervals along the side wall of the case.

[0017] By positioning the heat dissipation section along the side wall of the case, heat is more easily transferred from the heat dissipation section to the case via the heat dissipation resin.

[0018] Preferably, the heat-dissipating resin is in contact with the case and the heat dissipation section.

[0019] This configuration allows heat generated by the plate-shaped coil to be more easily transferred from the heat dissipation section to the case via the heat-dissipating resin.

[0020] The plate-shaped coil may include a first plate-shaped coil having the heat dissipation portion and a second plate-shaped coil connected to the lead portion of the first plate-shaped coil. Furthermore, the coil body portion of the second plate-shaped coil may be spaced apart from the coil body portion of the first plate-shaped coil so as to face it.

[0021] This configuration allows wires to be placed between the first and second plate-shaped coils. This makes it possible to increase the coupling coefficient between the plate-shaped coils and the wire-wound coils, and also allows for more efficient heat dissipation.

[0022] The heat dissipation portion provided in the first plate-shaped coil may have an end that is closer to the lower wall of the case than the coil body portion of the second plate-shaped coil.

[0023] Since the end of the heat radiating portion is close to the lower wall of the case, the heat generated in the first plate-shaped coil (located on the side far from the lower part of the case) that is more likely to reach a higher temperature can be efficiently radiated from the heat radiating portion to the lower wall through the heat radiating resin. For example, when the coil device is placed so that the lower wall contacts a substrate provided with a cooling device or the like, the heat of the coil device can be radiated particularly efficiently.

[0024] The bobbin may have a protrusion that separates the heat radiating portion from the side wall of the case.

[0025] The bobbin may have a notch portion where the heat radiating portion is disposed.

[0026] The protrusion can also ensure insulation between the heat radiating portion and the side wall. By disposing the heat radiating portion in the notch portion, a short circuit between the heat radiating portion and the case can be more effectively suppressed. In this way, by ensuring insulation between the heat radiating portion and the side wall and arranging the heat radiating portion close to the side wall, heat can be radiated more efficiently from the heat radiating portion to the side wall.

[0027] The bobbin may have a protruding portion where a part thereof is exposed from the heat radiating resin.

[0028] In such a coil device, for example, when winding a wire around the bobbin, it is also possible to fix the wire to the protruding portion of the bobbin and draw it out in a desired drawing direction.

[0029] The plate-shaped coil may have a heat radiating block attached via an insulating wall. Further, the insulating wall may be a flange portion of the bobbin.

[0030] By configuring in this way, heat radiation from the plate-shaped coil can be performed more efficiently.

Brief Description of the Drawings

[0031] [Figure 1] FIG. 1 is an overall perspective view of a coil device according to an embodiment. [Figure 2] Figure 2 is an exploded perspective view of the coil device shown in Figure 1. [Figure 3] Figure 3 is an exploded perspective view of the bobbin shown in Figure 2. [Figure 4] Figure 4 is a perspective view of the case shown in Figure 2. [Figure 5] Figure 5 is a plan view of a portion of the coil device shown in Figure 1. [Figure 6] Figure 6 is a cross-sectional view taken along the line VI-VI shown in Figure 1. [Figure 7] Figure 7 is a perspective view of the plate-shaped coil shown in Figure 2. [Figure 8] Figure 8 is a rear view of a portion of the coil device shown in Figure 1. [Figure 9] Figure 9 is a perspective view of a plate-shaped coil according to another embodiment. [Figure 10] Figure 10 is a rear view of a portion of a coil device according to another embodiment. [Figure 11] Figure 11 is an overall perspective view of a coil device according to yet another embodiment. [Figure 12] Figure 12 is a cross-sectional view taken along the line XII-XII shown in Figure 11. [Figure 13] Figure 13 is a perspective view of the plate-shaped coil of the coil device shown in Figure 11. [Modes for carrying out the invention]

[0032] Embodiments of the present invention will be described below with reference to the drawings. While the drawings will be referenced as necessary, the illustrations are provided only schematically and illustratively for the purpose of understanding the present invention, and the appearance and dimensional ratios may differ from those of the actual product. Furthermore, while the embodiments will be described in detail below, the invention is not limited to these embodiments.

[0033] First Embodiment The coil device 1 shown in Figure 1 will be described in detail below. The coil device 1 can be mounted on electronic equipment that functions as a transformer and to which high voltage is applied, and can be used in, for example, in car chargers, power supply circuits for household or industrial electrical equipment, or power supply circuits for computer equipment. Figure 2 is an exploded perspective view of the coil device 1 shown in Figure 1. As shown in Figure 2, the coil device 1 has a plate-shaped coil 10 and a case 40 in which the plate-shaped coil 10 is housed. The size of the coil device 1 is not particularly limited.

[0034] The plate-shaped coil 10 is capable of carrying a relatively large current. The plate-shaped coil 10 has a first plate-shaped coil 10a. The material of the first plate-shaped coil 10a is not particularly limited, but it is composed of a conductor such as copper, copper alloy, brass, or steel. The first plate-shaped coil 10a can be formed from a flat plate having a substantially constant thickness.

[0035] The first plate-shaped coil 10a has a coil body portion 12a with an axis C passing through the center O1 as the winding axis, and a lead portion 14a extending from the coil body portion 12a. In the drawing, the X, Y, and Z axes are perpendicular to each other. The Z axis coincides with the winding axis C of the plate-shaped coil 10, and the X axis is perpendicular to the winding axis C and coincides with the direction in which the lead portion 14a extends when viewed from the winding axis C.

[0036] The coil body portion 12a has a roughly C-shape, wound around the winding axis C in one turn. The coil body portion 12a is a flat plate aligned with the XY plane. The lead portions 14a are each arranged in the same plane as the coil body portion 12a.

[0037] As shown in Figure 2, the lead portion 14a has an intermediate lead portion 16a and an end lead portion 15a. The intermediate lead portion 16a is drawn out from the coil body portion 12a at a drawout position 16a2 located on one end of the coil body portion 12a in the X-axis direction. The intermediate lead portion 16a is located on a center line L1 that passes through the center O1 of the coil body portion 12a and is aligned with the X-axis. A connection hole 16a1 is formed in the intermediate lead portion 16a.

[0038] Furthermore, the end lead portion 15a is drawn out from the coil body portion 12a at a drawout position 15a2 located on one end of the coil body portion 12a in the X-axis direction. The end lead portion 15a is positioned offset in the Y-axis direction from the center line L1. A connection hole 15a1 is formed in the end lead portion 15a. The connection hole may be used for connection to a substrate or the like.

[0039] As shown in Figure 7, the plate-shaped coil 10a has a heat dissipation section 18 connected to the coil body 12a. The heat dissipation section 18 is a plate-shaped heat sink and can be formed by bending the coil body 12a, but it may also be formed by independently forming the heat dissipation section 18 and welding it to the coil body 12a. The heat dissipation section 18 may also be divided into multiple strips.

[0040] As shown in Figure 7, the heat dissipation section 18 has a plane along the Z-axis direction and is positioned substantially perpendicular to the coil body 12a. The heat dissipation section 18 only needs to intersect the coil body 12a at a predetermined angle, and may be positioned at an obtuse or acute angle relative to the coil body 12a.

[0041] The size and shape of the heat dissipation section 18 can be determined from the viewpoint of whether it is a size that the coil device 1 can tolerate and from the viewpoint of improving heat dissipation. The width Ly along the Y-axis and the length Lz along the Z-axis of the heat dissipation section 18 are not particularly limited, but they can be designed to increase the surface area of ​​the heat dissipation section 18. The width Ly of the heat dissipation section 18 may be designed to be larger than the width L1 in the Y-axis direction of the end lead section 15a and the width L2 in the Y-axis direction of the intermediate lead section 16a, as shown in Figure 5. Also, the width Ly of the heat dissipation section 18 may be designed to be smaller than the diameter D (width in the Y-axis direction) of the coil body section 12a shown in Figure 2, from the viewpoint of miniaturizing the coil device 1.

[0042] As shown in Figure 2, the plate coil 10 may further have a second plate coil 10b. The second plate coil 10b is positioned below the first plate coil 10a in the Z-axis direction. The second plate coil 10b is not particularly limited, but may be made of the same material as the first plate coil 10a, although it does not necessarily have to be the same. The second plate coil 10b may be formed from a flat plate having a substantially constant thickness. The second plate coil 10b may have the same thickness as the first plate coil 10a, but it may also have a different thickness.

[0043] As shown in Figure 7, the second plate-shaped coil 10b has a coil body portion 12b and a lead portion 14b drawn out from the coil body portion 12b. The coil body portion 12b has a winding axis common to the winding axis C of the coil body portion 12a, and the center O2 of the coil body portion 12b is located on the winding axis C.

[0044] As shown in Figure 7, the coil body portion 12b has a C-shape, wound around the winding axis C in one turn. The coil body portion 12b is a flat plate aligned with the XY plane. The coil body portion 12b is positioned spaced apart in the Z-axis direction so as to be substantially parallel to and opposite the coil body portion 12a of the first plate-shaped coil 10a.

[0045] As shown in Figure 7, the lead portion 14b has an intermediate lead portion 16b and an end lead portion 15b. The intermediate lead portion 16b is drawn out from the coil body portion 12b at a drawout position 16b2 located on one end of the coil body portion 12b in the X-axis direction. The intermediate lead portion 16b is located on a center line L2 that passes through the center O2 of the coil body portion 12b and is aligned with the X-axis.

[0046] As shown in Figure 7, the intermediate lead portion 16b is bent in a crank shape. Specifically, the intermediate lead portion 16b has a first portion 16b3 that is pulled out in the X-axis direction from the pull-out position 16b2, a second portion 16b4 that extends upward along the Z-axis from the end of the first portion 16b3, and a third portion 16b5 that extends in the X-axis direction from the end of the second portion 16b4. A connection hole 16b1 is formed in the third portion 16b5.

[0047] Furthermore, as shown in Figure 7, the end lead portion 15b is drawn out from the coil body portion 12b at a drawout position 15b2 located on one end of the coil body portion 12b in the X-axis direction. The end lead portion 15b is positioned offset from the center line L2 in the Y-axis direction, opposite to the end lead portion 15a.

[0048] As shown in Figure 7, the end lead portion 15b is bent in a crank shape. That is, the end lead portion 15b has a first portion 15b3 that is pulled out in the X-axis direction from the pull-out position 15b2, a second portion 15b4 that extends upward along the Z-axis from the end of the first portion 15b3, and a third portion 15b5 that extends in the X-axis direction from the end of the second portion 15b4. A connection hole 15b1 is formed in the third portion 15b5. The connection hole may be used for connection to a substrate or the like.

[0049] As shown in Figure 7, the second plate-shaped coil 10b is connected to the intermediate lead portion 16a of the first plate-shaped coil 10a by the third portion 16b5 of the intermediate lead portion 16b. The second plate-shaped coil 10b is positioned so that the connection hole 16a1 of the intermediate lead portion 16a and the connection hole 16b1 of the intermediate lead portion 16b are in communication. The connection holes may also be used for connection to a substrate or the like.

[0050] As shown in Figure 7, the first plate coil 10a and the second plate coil 10b are connected by intermediate lead portions 16a and 16b to form a two-turn plate coil 10 having a pair of end lead portions 15a and 15b. The end lead portions 15a and 15b may be connected to, for example, an external circuit. The heat dissipation portion 18 of the first plate coil 10a is not in contact with the second plate coil 10b, and a gap of width W3 is provided between the heat dissipation portion 18 and the coil body portion 12b.

[0051] As shown in Figure 4, the case 40 has an opening 41 that opens in the direction of the X-axis. The case 40 may also have an upper wall 43 positioned above in the Z-axis direction, a lower wall 44 positioned below, and side walls 45 positioned in the X-axis and Y-axis directions. The shapes of the upper wall 43, lower wall 44, and side walls 45 are not particularly limited. The side walls 45 are preferably formed to surround the outer shapes of the cores 30a, 30b and bobbin 50 as viewed along the Z-axis direction as shown in Figure 5. The case 40 is preferably made of a metal with excellent heat dissipation properties such as aluminum, and is formed, for example, by bending a single metal plate, but it may also be made of a resin or ceramic with excellent heat dissipation properties.

[0052] As shown in Figure 2, the coil device 1 may have a bobbin 50, and a wire 80 may be wound around the bobbin 50. The bobbin 50 is made of a plastic such as PPS, PET, PBT, LCP, or nylon, but it may be made of other insulating materials. As the wire 80, for example, a wire may be made of a core material made of a good conductor such as copper (Cu), covered with an insulating material such as imide-modified polyurethane, and further covered on the outermost surface with a thin resin film such as polyester, but a wire with other configurations may also be used.

[0053] As shown in Figure 3, the bobbin 50 includes a bobbin body 65, an upper flange 52 attached to the upper part of the bobbin body 65 in the Z-axis direction, and a lower flange 60 attached to the lower part of the bobbin body 65 in the Z-axis direction. The bobbin 50 has a through hole 51 that penetrates the upper flange 52, the bobbin body 65, and the lower flange 60 in the Z-axis direction.

[0054] As shown in Figure 3, the bobbin body 65 has an upper end flange 66 formed on the upper side in the Z-axis direction for attaching the coil body portion 12a of the first plate-shaped coil 10a. The upper end flange 66 has insulating protrusions 69 formed on it to prevent short circuits between the end lead portion 15a and the intermediate lead portion 16a when the first plate-shaped coil 10a shown in Figure 7 is attached. The insulating protrusions 69 can be used to position the first plate-shaped coil 10a.

[0055] As shown in Figure 3, projections 68a and 68b are formed on the upper flange 66 of the main body. The projections 68a and 68b protrude from the end of the upper flange 66 of the main body in the X-axis direction. In addition, a notch 67 is formed on the upper flange 66 of the main body. The notch 67 is positioned between the projections 68a and 68b.

[0056] The bobbin body 65 has a lower end flange 70 formed on the lower side in the Z-axis direction for attaching the coil body portion 12b of the second plate-shaped coil 10b. Similar to the upper end flange 66, the lower end flange 70 may also have insulating protrusions (not shown) formed on it to prevent short circuits with the end lead portion 15b and the intermediate lead portion 16b when the second plate-shaped coil 10b shown in Figure 7 is attached.

[0057] As shown in Figure 3, projections 72a and 72b are formed on the lower end flange 70 of the main body. The projections 72a and 72b protrude from the X-axis end of the lower end flange 70 of the main body in the same direction as the projections 68a and 68b of the upper end flange 66 of the main body. In addition, a notch 71 is formed on the lower end flange 70 of the main body. The notch 71 is positioned between the projections 72a and 72b.

[0058] As shown in Figure 8, the protrusions 68a and 72a are arranged side by side in the Z-axis direction. Similarly, the protrusions 68b and 72b are arranged side by side in the Z-axis direction. When the first plate-shaped coil 10a is attached to the bobbin 50, the heat dissipation section 18 is positioned in the notches 67 and 71. The protrusions 68a, 68b, 72a, and 72b protrude outward in the X-axis direction from the heat dissipation section 18.

[0059] As shown in Figure 3, intermediate flanges 75a and 75b are formed on the bobbin body 65. As shown in Figure 6, wire 80 can be wound around the bobbin body 65. For example, a winding section 82a is positioned between the upper flange 66 and the intermediate flange 75a. A winding section 82b is positioned between the intermediate flanges 75a and 75b. A winding section 82c is positioned between the intermediate flange 75b and the lower flange 70.

[0060] The winding method of the wire 80 is not particularly limited. For example, the wire 80 may be α-wound in winding sections 82a and 82b, and normally wound in winding section 82c. Also, the number of turns in winding sections 82a, 82b, and 82c is not particularly limited and may be one turn or multiple turns, respectively.

[0061] As shown in Figure 3, the upper flange portion 52 has a projection 53 formed at one end in the X-axis direction. The projection 53 has a first groove 55 and a second groove 56 formed therein. For example, the first groove 55 and the second groove 56 may be configured to extend along the Y-axis. For example, as shown in Figure 5, a pull-out portion 84 is placed in the first groove 55, and a pull-out portion 86 is placed in the second groove 56. By attaching external terminals 88 to the tips of the pull-out portions 84 and 86 and placing them in the grooves 55 and 56, the pull-out position can be freely changed, and the coil device 1 can be attached according to the substrate 102 or the like.

[0062] As shown in Figure 3, a block holding portion 57 is formed at the other end in the X-axis direction of the upper flange portion 52. Also, a block holding portion 61 is formed at the other end in the X-axis direction of the lower flange portion 60. As shown in Figure 6, heat dissipation blocks 3, each made of a metal such as aluminum or another material with high thermal conductivity, may be attached to the block holding portions 57 and 61, respectively.

[0063] The upper flange portion 52 can be attached to the bobbin body 65 by fitting the locking piece 58 into the locking groove 77 of the bobbin body 65. As shown in Figure 6, the upper flange portion 52 may also be attached so as to sandwich the coil body portion 12a of the first plate coil 10a between itself and the upper end flange 66 of the body. The first plate coil 10a is attached to the bobbin 50 in which the winding shaft C is located in the through hole 51.

[0064] The lower flange portion 60, like the upper flange portion 52, can be attached to the bobbin body 65 by fitting the locking piece 62 into the locking groove of the bobbin body 65 (not shown). As shown in Figure 6, the lower flange portion 60 may be attached so as to sandwich the coil body portion 12b of the second plate-shaped coil 10b between itself and the lower end flange 70 of the body. The second plate-shaped coil 10b is attached to the bobbin 50 in which the winding shaft C is located in the through hole 51. Alternatively, the bobbin cover 2 shown in Figure 2 may be attached from both sides in the Y-axis direction.

[0065] As shown in Figure 2, the coil device 1 may have cores 30a and 30b. Each of the cores 30a and 30b has a base portion 31, a middle leg portion 32, and a pair of outer leg portions 33.

[0066] The material of cores 30a and 30b is not particularly limited, but may be formed from a magnetic material alone or from a material containing a magnetic material and a resin. Examples of magnetic materials constituting the core include ferrite and metallic magnetic materials. Examples of ferrite include Mn-based ferrite, Ni-Zn-based ferrite, and Mn-Zn-based ferrite. Examples of metallic magnetic materials are not particularly limited, but include Fe-Ni alloy, Fe-Si alloy, Fe-Si-Cr alloy, Fe-Co alloy, Fe-Si-Al alloy, amorphous iron, and the like. Examples of resin are not particularly limited, but include epoxy resin, phenolic resin, polyester resin, polyurethane resin, polyimide resin, other synthetic resins, or other non-magnetic materials. The core may also be a sintered body of a metallic magnetic material.

[0067] As shown in Figure 6, the base portion 31 of core 30a is positioned above the upper flange portion 52 in the Z-axis direction, and the base portion 31 of core 30b is positioned below the lower flange portion 60 in the Z-axis direction. The middle leg portion 32 is inserted into the through hole 51. As shown in Figure 8, the outer leg portions 33 are each positioned on the outside of the bobbin cover 2 in the Y-axis direction.

[0068] As shown in Figure 6, the plate coil 10, bobbin 50, wire 80, cores 30a, 30b, and heat dissipation block 3 are housed in a case 40. The case 40 is filled with heat dissipation resin 100. The heat dissipation resin 100 may be in contact with each part of the plate coil 10, bobbin 50, wire 80, cores 30a, 30b, and heat dissipation block 3.

[0069] As shown in Figure 6, the projections 68a (68b) of the upper flange 66 of the main body and the projections 72a (72b) of the lower flange 70 of the main body may be in contact with the lateral wall 45 in the Y-axis direction. When the projections 68a, 68b, 72a, and 72b are in contact with the lateral wall 45, a gap of width W1 is provided between the lateral wall 45 in the Y-axis direction and the heat dissipation section 18, and a gap of width W2 is provided between the end 19 of the heat dissipation section 18 and the lower wall 44.

[0070] The widths W1 and W2 are not particularly limited, but the narrower the widths W1 and W2, the more efficient the heat dissipation from the heat dissipation section 18 to the case 40 via the heat dissipation resin 100. By having predetermined widths W1 and W2, insulation between the case 40 and the plate-shaped coil 10 is maintained in the coil device 1. In the case of an insulating case such as resin, the widths W1 and W2 may be omitted, and the heat dissipation section may be positioned in contact with the plate-shaped coil to dissipate heat directly from the heat dissipation section to the case. In addition, a gap of width W3 is provided between the heat dissipation section 18 and the coil body section 12b. The width W3 is not particularly limited, but it is preferable that it is wide enough to prevent short circuits between the coil body sections 12a and 12b.

[0071] As shown in Figure 6, when the first plate-shaped coil 10a is positioned on the side furthest from the lower wall 44 of the case 40, the first plate-shaped coil 10a tends to become hotter in the coil device 1. The first plate-shaped coil 10a has a heat dissipation section 18 that intersects the coil body 12a at a predetermined angle, and the heat generated in the plate-shaped coil can be dissipated through the heat dissipation section 18 that intersects the coil body 12a at a predetermined angle, thereby improving the heat dissipation performance of the plate-shaped coil.

[0072] As shown in Figure 6, the thickness T1 of the flat plate constituting the first plate coil 10a is not particularly limited, but it may be designed to be thicker than the thickness T2 of the flat plate constituting the second plate coil 10b. It is preferable that the thickness T1 of the first plate coil 10a, which is prone to high temperatures, be 1.1 times or more, preferably 1.2 times or more, and particularly preferably 1.3 times or more, than the thickness T2 of the second plate coil 10b. By making the thickness T1 of the first plate coil 10a about 1.3 times the thickness T2 of the second plate coil 10b, heat dissipation can be further improved.

[0073] The predetermined angle at which the heat dissipation section 18 intersects the coil body section 12a is not particularly limited. For example, as shown in Figure 6, the heat dissipation section 18 may be arranged along the Z-axis direction of the plate-shaped coil 10 (i.e., so that the predetermined angle is approximately 90°). When the heat dissipation section 18 is arranged along the Z-axis direction, the heat dissipation section 18 faces the side wall 45 of the case 40 that covers the X-axis direction, improving heat dissipation and enabling space saving.

[0074] As shown in Figure 7, the heat dissipation section 18 may be located on one side of the X-axis, while the lead section 14a may be located on the other side of the X-axis. In other words, the heat dissipation section 18 may be located on the opposite side of the coil body section 12a from the lead section 14a. By arranging the heat dissipation section 18 in this manner, the heat generated by the plate coil can be more effectively released to the outside of the coil device.

[0075] As shown in Figure 7, the second plate-shaped coil 10b may have heat dissipation sections 18a and 18b. The heat dissipation sections 18a and 18b of the second plate-shaped coil 10b can improve heat dissipation performance in the same way as the heat dissipation section 18 of the first plate-shaped coil 10a.

[0076] As shown in Figure 1, the coil device 1 includes a heat-dissipating resin 100 filled inside a case 40. The case 40 may be made of metal, resin, or a composite material thereof, but it is preferable that it be made of a material with high thermal conductivity. The heat-dissipating resin 100 is, for example, a potting resin, and may be made of silicone resin, urethane resin, epoxy resin, etc.

[0077] In the coil device 1, the plate-shaped coil 10 is covered by the case 40 and immersed in the heat-dissipating resin 100. As a result, the heat generated in the plate-shaped coil 10 is easily transferred from the heat dissipation section 18 to the case 40 via the heat-dissipating resin 100. This heat dissipation through the case 40 improves the heat dissipation performance of the coil device 1.

[0078] As shown in Figure 6, in the coil device 1, the wire 80 may be wound and arranged between the coil body portion 12a of the first plate coil 10a and the coil body portion 12b of the second plate coil 10b. In the coil device 1, it is also possible to increase the coupling coefficient between the plate coils and the wire-wound coils, and heat dissipation can be performed efficiently.

[0079] As shown in Figure 6, in the coil device 1, the heat dissipation portion 18 provided on the first plate coil 10a may have an end portion 19 that is closer to the lower wall 44 of the case 40 than the coil body portion 12b of the second plate coil 10b.

[0080] As shown in Figure 6, the end portion 19 of the heat dissipation section 18 is close to the lower wall 44 of the case 40. This allows the heat generated in the first plate-shaped coil 10a, which is positioned further away from the lower wall 44 and tends to become hotter, to be efficiently dissipated from the heat dissipation section 18 to the lower wall 44 via the heat dissipation resin 100. For example, as shown in Figure 6, when the coil device 1 is mounted so that the lower wall 44 is in contact with a substrate 102 equipped with a cooling device, heat dissipation from the coil device 1 can be performed particularly efficiently.

[0081] Furthermore, in the coil device 1 shown in Figure 1, compared to using a coil device with a plate-shaped coil without a heat dissipation section under the same conditions, the temperature of the first plate-shaped coil 10a, which reaches the highest temperature, can be reduced by at least 5%, and more preferably by at least 10%.

[0082] As shown in Figure 1, the coil device 1 may have a bobbin 50 on which a plate-shaped coil 10 is arranged, and cores 30a and 30b arranged on the winding axis C of the plate-shaped coil 10. Even if the coil device 1 has cores 30a and 30b, the heat generated in the cores 30a and 30b can also be released to the outside of the case 40. In addition to a plate-shaped coil, it is also possible to wind, for example, a wire 80 around the bobbin of the coil device.

[0083] As shown in Figure 1, the case 40 may have an opening 41 that opens to the side. If the case 40 has an opening 41 that opens to the side (for example, in the X-axis direction), the lead portions 14a and 14b can be pulled out to the outside of the case 40 from the side of the case 40 through the opening 41, and it is not necessary to pull the lead portions 14a and 14b out to the outside of the case 40 from the top of the case 40 in the Z-axis direction. Therefore, it is not necessary to make the top of the bobbin 50 protrude to the outside of the case 40 for positioning purposes, and the height of the bobbin 50 can be reduced accordingly, making the coil device 1 lower profile.

[0084] As shown in Figure 6, the heat dissipation section 18 may be spaced apart along the side wall 45 of the case 40. The heat dissipating resin 100 is in contact with the case 40 and the heat dissipation section 18. With the heat dissipation section 18 positioned along the side wall 45 of the case 40, and the heat dissipating resin 100 positioned between the side wall 45 and the lower wall 44, heat is more easily transferred from the heat dissipation section 18 to the case 40 via the heat dissipating resin 100. With the heat dissipating resin 100, the heat dissipation section 18, and the case 40 arranged in this way, the heat generated in the plate-shaped coil 10 is more easily transferred from the heat dissipation section 18 to the case 40 via the heat dissipating resin 100.

[0085] As shown in Figure 3, the bobbin 50 may have protrusions 68a and 68b. Also, as shown in Figure 5, the bobbin 50 may have a notch 67 in which the heat dissipation section 18 is positioned. The protrusions 68a and 68b allow the heat dissipation section 18 to be separated from the side wall 45 of the case 40, as shown in Figure 6.

[0086] The protrusions 68a and 68b can also ensure insulation between the heat dissipation section 18 and the side wall 45. By positioning the heat dissipation section 18 in the notch 67, short circuits between the heat dissipation section 18 and the case 40 can be more effectively prevented. In this way, by positioning the heat dissipation section 18 close to the side wall 45 while ensuring insulation between the heat dissipation section 18 and the side wall 45, heat can be dissipated more efficiently from the heat dissipation section 18 to the side wall 45.

[0087] As shown in Figure 3, the bobbin 50 may have a protruding portion 53 that is partially exposed from the heat-dissipating resin 100. As shown in Figure 1, when winding the wire 80 onto the bobbin 50, it is possible to fix the lead-out portions 84 and 86 from the winding portions 82a, 82b, and 82c to the protruding portion 53 of the bobbin 50 and pull them out in a desired pulling direction (along the Y-axis in Figure 1).

[0088] As shown in Figure 6, a heat dissipation block 3 may be attached near the plate coil 10 via an insulating wall which is part of the flange portion 52, 60 of the bobbin 50. The heat dissipation block 3 is easily heat-transferred to, allowing for more efficient heat dissipation from the plate coil. In particular, heat dissipation is more efficient when the heat dissipation block 3 is placed near the first plate coil 10a, which tends to become hot. As shown in Figure 6, heat dissipation is more efficient when the upper wall 43 of the case 40 is placed above the heat dissipation block 3 which is positioned above the first plate coil 10a in the Z-axis direction.

[0089] Specifically, in the coil device 1 shown in Figure 1, it is possible to lower the temperature of the first plate-shaped coil 10a, which reaches the highest temperature, by more than 2% compared to using a coil device without a heat dissipation block under the same conditions.

[0090] Second Embodiment In the following description of the coil device 1a shown in Figure 10, the parts common to the first embodiment will be omitted, and the differences will be described in detail below. The parts not described below are the same as those described in the first embodiment. The coil device 1a differs from the coil device 1 shown in Figure 1 mainly in the configuration of the first plate coil 10a.

[0091] The coil device 1a has a first plate-shaped coil 10a as shown in Figure 9. As shown in Figure 9, the first plate-shaped coil 10a of this embodiment has heat dissipation sections 181 and 182. The heat dissipation sections 181 and 182 extend downward in the Z-axis direction from both sides of the coil body 12a in the Y-axis direction, respectively. As shown in Figure 10, the heat dissipation sections 181 and 182 do not come into contact with the coil body 12b of the second plate-shaped coil 10b, and are arranged with a predetermined width W4 between them. The width W4 may be designed in the same way as the width W3 of the first embodiment.

[0092] Third Embodiment In the following description of the coil device 1b shown in Figure 11, the parts common to the first embodiment will be omitted, and the differences will be described in detail below. The parts not described below are the same as those described in the first embodiment. The coil device 1b differs from the case 40 of the coil device 1 shown in Figure 1 mainly in the configuration of the case 40a.

[0093] As shown in Figure 11, the case 40a has an opening 41 that opens upward in the Z-axis direction. The case 40 has a lower wall 44a positioned below it and a side wall 45a having a normal substantially perpendicular to the Z-axis direction. The shapes of the lower wall 44a and the side wall 45a are not particularly limited. The side wall 45a may, for example, form a wall surface perpendicular to the X-axis and a wall surface perpendicular to the Y-axis.

[0094] Furthermore, as shown in Figure 13, the coil device 1b differs from the coil device 1 in the configuration of the first plate-shaped coil 10a. The first plate-shaped coil 10a in this embodiment has an end lead portion 115a and an intermediate lead portion 116a.

[0095] As shown in Figure 13, the end lead portion 115a is bent in a crank shape. That is, the end lead portion 115a has a first portion 115a3 that is drawn out in the X-axis direction from the coil body portion 12a, a second portion 115a4 that extends upward along the Z-axis from the end of the first portion 115a3, and a third portion 15a5 that extends in the X-axis direction from the end of the second portion 115a4.

[0096] As shown in Figure 13, the intermediate lead portion 116a is bent in a crank shape. Specifically, the intermediate lead portion 116a has a first portion 116a3 that is drawn out in the X-axis direction from the coil body portion 12a, a second portion 116a4 that extends upward along the Z-axis from the end of the first portion 116a3, and a third portion 116a5 that extends in the X-axis direction from the end of the second portion 116a4.

[0097] As shown in Figure 12, the intermediate lead portion 116a is positioned such that the third portion 116a5 is located above the side wall 45a of the case 40a in the Z-axis direction. Similarly to the intermediate lead portion 116a, the end lead portion 115a is also positioned such that the third portion 115a5 is located above the side wall 45a of the case 40a in the Z-axis direction.

[0098] As shown in Figure 12, a gap of width W5 is provided between the third portions 16b4 and 15b4 of the intermediate lead portion 16b and the end lead portion 15b and the side wall 45a. The width W5 may be designed in the same way as the width W2 of the first embodiment.

[0099] Furthermore, the embodiments described above also include various design modifications that do not depart from the gist of the claims, within the scope of the technical realm. [Explanation of symbols]

[0100] 1, 1a, 1b... Coil device 10…Plate-shaped coil 10a...First plate-shaped coil 12a... Coil body 14a, 114a... Lead section 15a, 115a... End lead section 15a1…Connection hole 15a2…Drawer position 115a3…first part 115a4…Second part 115a5…3rd part 16a, 116a... Intermediate lead section 16a1…Connection hole 16a2…Drawer position 116a3…first part 116a4…Second part 116a5…3rd part 18,181,182…Heat radiation part 19…End 10b...Second plate-shaped coil 12b... Coil body 14b... Lead section 15b...End lead section 15b1…Connection hole 15b2…Drawer position 15b3…1st part 15b4…Second part 15b5…3rd part 16b...Intermediate lead section 16b1…Connection hole 16b2…Drawer position 16b3…1st part 16b4…Second part 16b5…3rd part 18a, 18b…heat radiation part 30a, 30b... Core 31...Base section 32...middle leg 33...Outer leg 40,40a…case 41,41a...opening 43…Upper wall 44,44a…Lower wall 45,45a…Side wall 50... Bobbin 51…Through hole 52...Upper collar 53...Protrusion 55…1st groove 56…Second groove 57…Block holding part 58… Locking piece 60…Lower flange 61…Block holding part 62… Locking piece 65... Bobbin body 66... ​​Upper end guard of the main body 67... Notch 68a, 68b…Protrusion 69...Insulating protrusions 70...Guard at the bottom of the main body 71... Notch 72a, 72b…Protrusion 75a, 75b... Intermediate guard 77… Locking groove 80... Wire 82a, 82b, 82c... Winding section 84,86...Drawer part 88…External terminals 100...Heat dissipating resin 102... Circuit board 2… Bobbin cover 3… Heat dissipation block

Claims

1. A plate-shaped coil having a flat coil body, a lead portion drawn out from the coil body, and a heat dissipation portion that intersects the coil body at a predetermined angle at a position different from the lead portion's drawing position on the coil body, A case in which the plate-shaped coil is housed, The heat-dissipating resin is filled inside the case, A coil device having a heat dissipation block attached near the plate-shaped coil via an insulating wall.

2. A bobbin on which the plate-shaped coil is arranged, The plate-shaped coil has a core that is positioned on the winding shaft, The coil device according to claim 1, wherein the case has an opening that opens to the side.

3. A bobbin on which the plate-shaped coil is arranged, The plate-shaped coil has a core that is positioned on the winding shaft, The coil device according to claim 1, wherein the case has an opening that opens upward.

4. The coil device according to any one of claims 1 to 3, wherein the heat dissipation portion is arranged on the opposite side from the lead portion, sandwiching the coil body portion.

5. The coil device according to any one of claims 1 to 3, wherein the heat dissipation section is arranged spaced apart along the side wall of the case.

6. The coil device according to any one of claims 1 to 3, wherein the heat-dissipating resin is in contact with the case and the heat-dissipating portion.

7. The plate-shaped coil comprises a first plate-shaped coil having the heat dissipation portion and a second plate-shaped coil connected to the lead portion of the first plate-shaped coil. The coil device according to any one of claims 1 to 3, wherein the coil body portion of the second plate-shaped coil is arranged at a distance from the coil body portion of the first plate-shaped coil so as to face it.

8. The coil device according to claim 7, wherein the heat dissipation portion has an end that is closer to the lower wall of the case than the coil body portion of the second plate-shaped coil.

9. The coil device according to claim 2 or 3, wherein the bobbin has a projection that separates the heat dissipation portion from the side wall of the case.

10. The coil device according to claim 2 or 3, wherein the bobbin has a notch in which the heat dissipation portion is arranged.

11. The coil device according to claim 2 or 3, wherein the bobbin has a protruding portion that is partially exposed from the heat-dissipating resin.

12. The coil device according to any one of claims 1 to 3, wherein the insulating wall is the flange portion of the bobbin.

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