JP2019016739A - Coil device - Google Patents

Abstract

To provide a coil device capable of reducing the resistance of a wiring, stabilizing the inductance, and also having excellent heat dissipation properties.SOLUTION: A lead seat 22 of a coil device 10 includes a first seat portion 22a in which a pair of first lead portions 37a and 37b which are both ends of a first wire 37 are disposed so as to be insulated from each other and a second seat portion 22b that is adjacent to the first seat portion 22a, and in which a pair of second lead portions 38 which are both ends of a second wire 38 are insulated from each other and also insulated from the first lead portions 37a and 37b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coil device having excellent heat dissipation, for example, used as a reactor, an inductor, or a transformer.

  As a coil device used for applications such as a reactor, for example, a device shown in Patent Document 1 is known. In a conventional coil device, a plurality of terminals are generally mounted on both sides along a first axis substantially perpendicular to the bobbin axis. With such a structure, it is easy to route the lead portion of the wire wound around the outer periphery of the bobbin.

JP 2014-36194 A

  However, when there are multiple terminals on both sides of the bobbin, it is necessary to perform wiring from both sides of the bobbin to the circuit board, etc., which increases the resistance for wiring and makes the inductance unstable. It was found that there was a problem. In addition, there is an increasing demand to increase heat dissipation by bringing the coil device that requires heat dissipation to one side instead of the center of the circuit board.

  The present invention has been made in view of such a situation, and an object thereof is to provide a coil device that can reduce the resistance of the wiring, stabilize the inductance, and is excellent in heat dissipation. is there.

In order to achieve the above object, a coil device according to the present invention comprises:
A first wire wound around the outer periphery of the bobbin;
A second wire insulated from the first wire and wound around the outer periphery of the bobbin;
A lead pedestal provided at one end of one side along a first axis substantially perpendicular to the axis of the bobbin,
The lead base is
A first pedestal portion in which a pair of first lead portions which are both ends of the first wire are arranged to be insulated from each other;
A second pedestal portion disposed adjacent to the first pedestal portion, wherein a pair of second lead portions which are both ends of the second wire are insulated from each other and insulated from the first lead portion; Have.

  In the coil device according to the present invention, the pair of first leads of the first wire and the pair of second leads of the second wire are not provided from both sides of the bobbin but from a pedestal for a lead provided at one end of the bobbin. The part is pulled out. For this reason, it is easy to bring the coil device that requires heat dissipation to one side instead of the center of the circuit board, the heat dissipation structure is simplified, and the heat dissipation characteristics are improved. Moreover, even if the coil device is moved to the end of the circuit board or the circuit element group, the first lead portion and the second lead portion can be pulled out from the lead pedestal at one end portion. Resistance does not increase and inductance is stabilized. In addition, a low resistance and low loss coil device can be realized at low cost.

Preferably, the first pedestal portion is formed with a pair of first lead grooves through which the pair of first lead portions are passed.
The second pedestal portion is formed with a pair of second lead grooves through which the pair of second lead portions pass.
The first lead groove and the second lead groove are partitioned by an insulating wall provided on the lead base.

  By configuring in this way, the insulation between the first lead portion and the second lead portion can be ensured satisfactorily, and the lead base can be easily disposed at one end of the bobbin.

  Preferably, the first wire and the second wire are wound on the outer periphery of the bobbin in order from the vicinity of the lead base along the axis. The second pedestal portion may be disposed outside the first pedestal portion along the first axis. Or you may arrange | position so that a 1st base part may be enclosed by a 2nd base part.

  By configuring in this way, the insulation between the first lead portion and the second lead portion can be ensured satisfactorily, and the lead base can be easily disposed at one end of the bobbin.

  Preferably, a lead guide cover is attached to an outer periphery of the bobbin where the lead base is located, and a pair of first lead portions of the first wire on the way from the outer periphery of the bobbin to the lead base. And a pair of second lead portions of the second wire on the way from the outer periphery of the bobbin to the lead base.

  By configuring in this way, the insulation between the first lead portion and the second lead portion can be ensured satisfactorily, and the lead base can be easily disposed at one end of the bobbin.

  Preferably, the lead guide cover includes second lead intermediate grooves that guide the pair of second lead portions of the second wire from the outer periphery of the bobbin toward the lead base in directions away from each other. It has.

  With this configuration, the second lead portion of the second wire wound around the outer periphery of the bobbin on the side far from the lead base is insulated from the first lead portion of the first wire. It becomes easy to guide to the lead base while preventing unwinding. As a result, the inductance can be stabilized. In addition, the resistance and loss of the coil device can be further improved.

  On the outer periphery of the bobbin where the lead pedestal is located, a pair of second lead parts are separated and insulated from each other in the axial direction, and crossed when viewed from the axial direction, the lead guide cover It may be provided with a brim that guides to.

  With this configuration, the second lead portion of the second wire wound around the outer periphery of the bobbin on the side far from the lead base is insulated from the first lead portion of the first wire. It becomes easy to guide to the lead base while preventing unwinding. As a result, the inductance can be stabilized. In addition, the resistance and loss of the coil device can be further improved.

  Since the first wire is wound around the outer periphery of the bobbin on the side close to the lead pedestal, the first lead portion of the first wire is different from the second lead portion of the second wire, as viewed from the axis. Even without overlapping each other, the first wire can be easily guided to the pedestal while preventing the unwinding of the first wire.

  The lead guide cover may be provided with a guide inclined wall for guiding the lead guide cover to the lead guide cover without intersecting the pair of second lead portions when viewed from the axial direction.

  Even in this configuration, the second lead portion of the second wire wound around the outer periphery of the bobbin on the side far from the lead base is insulated from the first lead portion of the first wire, and the second wire It becomes easy to guide to the lead base while preventing unwinding. As a result, the inductance can be stabilized. In addition, the resistance and loss of the coil device can be further improved.

Preferably, one of the pair of first lead portions and one of the pair of second lead portions are drawn side by side from the lead base,
The other of the pair of first lead portions and the other of the pair of second lead portions are pulled out side by side from the lead base.

  By configuring in this way, one of the pair of first lead portions and one of the pair of second lead portions can be easily connected, and a specific circuit for non-contact power feeding can be provided. It can be easily configured. Note that the other of the pair of first lead portions may be connected to the other of the pair of second lead portions.

Preferably, the coil device is
A core assembly partially attached to a through-hole formed along the axial center of the bobbin;
A case covering the outer periphery of the bobbin to which the core assembly is attached by winding the first wire and the second wire;
A heat transfer resin accommodated in the case and capable of entering a gap between the case and the bobbin, a gap between the case and the core assembly, and a gap between the bobbin and the core assembly; And further.

  By comprising in this way, the heat dissipation of a coil apparatus further improves.

The core assembly has at least a pair of split cores divided by a split surface;
These divided cores are respectively integrated into a middle leg portion that enters the through hole of the bobbin, a base portion that is integrated with the middle leg portion and located outside the through hole, and both sides of the base portion. And an outer leg attached to the outside of the bobbin,
The projection length of the middle leg portion from the base portion is shorter than the projection length of the outer leg portion from the base portion,
A gap for gap formed at the protruding tip of the middle leg is filled with the heat transfer resin.

  With this configuration, it is possible to adjust the inductance of the coil device, and it is easy to dissipate the heat at the center of the core assembly where heat easily accumulates through the heat transfer resin.

FIG. 1 is an overall perspective view of a coil device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the coil device shown in FIG. 3A is a cross-sectional view taken along line IIIA-IIIA shown in FIG. 3B is a cross-sectional view taken along line IIIB-IIIB shown in FIG. FIG. 3C is a partial cross-sectional view of the lead base along the line IIIC-IIIC shown in FIG. FIG. 4 is a perspective view of the bobbin shown in FIG. FIG. 5 is a perspective view showing the winding state of the first wire and the second wire shown in FIG. 3B and the relationship between these and the lead guide cover. FIG. 6 is a front view showing the relationship among the lead pedestal, lead guide cover, and lead portion of the bobbin shown in FIG. It is a circuit diagram which shows the circuit example of the coil apparatus shown in FIG. FIG. 8 is a perspective view showing a lead base provided on a bobbin of a coil device according to another embodiment of the present invention. FIG. 9A is a perspective view showing a coil device according to still another embodiment of the present invention. FIG. 9B is a perspective view showing the relationship between the first and second wires wound around the bobbin shown in FIG. 9A and the lead guide cover. FIG. 10 is a front view of the coil device shown in FIG. 9A viewed from the X-axis direction. FIG. 11 is a perspective view of only the bobbin shown in FIG. 9A.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

First Embodiment As shown in FIGS. 1 and 2, a coil device 10 according to this embodiment includes, for example, an in-vehicle four-terminal coil filter device, an in-vehicle charging device inductor device, an insulating transformer, a line filter, a noise filter, and the like. Used as

  The coil device 10 includes a bobbin 20, a core assembly 40, and a case 100 surrounding a lower portion in the Z-axis direction, and is attached to the upper surface of the casing. The casing is, for example, a plate-like member to which the coil device 10 is attached, and may be a part of an automobile part. Cooling water flows on the back surface (the side opposite to the attachment surface of the coil device 10). May be.

  As shown in FIG. 2, the bobbin 20 includes a bobbin main body 24, a lead pedestal 22 formed integrally with the upper portion in the Z-axis direction of one end of the bobbin main body 24 in the X-axis direction, and the lead The pedestal 22 has an auxiliary pedestal 23 formed integrally with the upper portion in the Z-axis direction on the opposite side to the X-axis direction.

  In the present embodiment, lead portions 37 a and 37 b of the first wire 37 and lead portions 38 a and 38 b of the second wire 38 described later are attached to the lead base 22. A terminal cover 25 is attached to the upper portion of the lead base 22 to which the lead portions 37a, 37b, 38a, and 38b are attached. In the present embodiment, no lead portion of any wire is attached to the auxiliary base 23.

  A pair of partition covers 50 are attached to both sides of the bobbin main body 24 in the Y-axis direction. The cover body 52 of the partition cover 50 has a shape that covers the outer periphery of the bobbin body 24 located between the lead base 22 and the auxiliary base 23 in the bobbin 20. At both ends in the Z-axis direction of the cover body 52, locking pieces 54 bent in a substantially vertical direction from the cover body 52 toward the bobbin body 24 are integrally formed. A pair of locking pieces 54 formed on both sides in the Z-axis direction of the cover body 52 are attached so as to sandwich the upper and lower surfaces of the bobbin body 24 in the Z-axis direction.

  Further, side leg guide pieces 56 extending in the Z-axis direction are integrally formed on the outer surfaces of both ends in the X-axis direction of the cover body 52. The outer surface of the cover main body 52 positioned between the pair of side leg guide pieces 56 is in contact with the inner surfaces of side legs 48a and 48b of the core assembly 40 described later, and the side legs 48a and 48b are arranged in the X-axis direction. The movement is restricted by the pair of side leg guide pieces 56. A fitting piece 58 is formed on the inner surface of the cover main body 52 along the outer periphery of the bobbin main body 24. As shown in FIG. 3A, the fitting piece 58 is fitted into a fitting groove 34 c formed on the outer periphery of the wound partition wall 34 to improve insulation between the first wire 37 and the second wire 38. Yes. These partition covers 50 are made of an insulating member such as plastic similar to the bobbin 20.

  As shown in FIG. 2, in the present embodiment, the core assembly 40 includes an upper core 40a and a lower core 40b. These cores 40a and 40b can be separated into two divided cores 42a and 42a and 42b and 42b having the same shape by dividing surfaces 43a and 43b, respectively. In the present embodiment, each of the divided cores 42a, 42a and 42b, 42b has the same shape, has an E-shaped cross section in the ZY cross section, and is a kind of E type core.

  By combining a pair of split cores 42a and 42a arranged at the upper part in the Z-axis direction, the Z-Y cross section has an E-shaped cross section, and constitutes a so-called E-type core. The other pair of split cores 42b and 42b arranged at the lower part in the Z-axis direction are combined to form a so-called E-type core having an E-shaped cross section in the ZY cross section.

  Each split core 42a disposed on the upper side in the Z-axis direction includes a base portion 44a extending in the Y-axis direction, a pair of side leg portions 48a projecting in the Z-axis direction from both ends of the base portion 44a in the Y-axis direction, A middle leg portion 46a projecting in the Z-axis direction from an intermediate portion of the base portion 44a located between them. Each split core 42b disposed on the lower side in the Z-axis direction includes a base portion 44b extending in the Y-axis direction, and a pair of side leg portions 48b projecting in the Z-axis direction from both ends in the Y-axis direction of the base portion 44b. And a middle leg portion 46b projecting in the Z-axis direction from an intermediate portion of the base portion 44b positioned therebetween.

  The pair of middle leg portions 46a are inserted into the core leg through hole 26 of the bobbin 20 from above in the Z-axis direction. Similarly, the pair of middle leg portions 46b are inserted into the core leg through hole 26 of the bobbin 20 from below in the Z-axis direction, and within the through hole 26, a predetermined gap is formed at the tip of the middle leg portion 46a. It is comprised so that it may oppose in the clearance gap 47 (refer FIG. 3A and 3B). The base portion 44 a of the split core 42 a and the base portion 42 b of the split core 42 b do not enter the through hole 26 and are located outside the bobbin main body 24 in the Z-axis direction.

  As shown in FIG. 3A, the protruding length in the Z-axis direction of the middle leg portion 46a from the base portion 44a is made shorter than the protruding length in the Z-axis direction of the outer leg portion 48a from the base portion 44a of the split core 42a. Thus, the gap gap 47 is formed. Alternatively, by shortening the protruding length in the Z-axis direction of the middle leg portion 46b from the base portion 44b than the protruding length in the Z-axis direction of the outer leg portion 48b from the base portion 44b of the split core 42b, A gap 47 is formed.

  The ends of the outer legs 48a and 48b in the Z-axis direction are butted in the Z-axis direction outside the bobbin 20. A gap gap 47 is formed between the tips of the Z-axis direction of the middle leg parts 46a and 46b which are formed to be shorter than the protruding length of the outer leg parts 48a and 48b in the Z-axis direction. The gap gap 47 in the Z-axis direction is determined according to the leakage characteristics of the coil device 10 and the like. Unless otherwise specified in the specification, the term “outside” and “inside” are used to mean the outside or the inside with respect to the bobbin 20.

  As shown in FIG. 2, a pair of separation protrusions 27 (only one in FIG. 2) is provided in the through-hole 26 along the Z-axis direction so as to divide the through-hole 26 along the Y-axis direction. (Illustrated) is preferably formed. The separation convex portion 27 is interposed between the split surfaces 43a of the pair of middle leg portions 42a and 42a, and is interposed between the split surfaces 43b of the middle leg portions 42b and 42b. As a result, the middle leg portions 42a and 42a or the middle leg portions 42b and 42b are arranged such that the divided surfaces 43a (43b) face each other within the through hole 26 with a predetermined gap and do not contact each other. .

  A predetermined gap (divided gap in the X-axis direction) between the split surfaces 43a, 43a (43b, 43b) formed by the pair of separation convex portions 27 is adjusted by the thickness of the separation convex portion 27 in the X-axis direction. can do. By setting the gap to a predetermined range, heat transfer resin 90 (see FIG. 3B) such as potting resin described later can easily enter without lowering the core inductance more than necessary, and heat dissipation is improved.

  Further, the protruding length in the Y-axis direction of the pair of separation convex portions 27 on the inner peripheral surface of the through hole 26 is a predetermined distance between the divided surfaces 43 a and 43 a (43 b and 43 b) formed inside the through hole 26. Of the through hole 26 is preferably 1/10 to 1/3 of the inner diameter in the Y-axis direction.

  The middle leg portions 42a and 42a or the middle leg portions 42b and 42b have an elliptical column shape that is long in the X-axis direction so as to match the inner peripheral surface shape of the through hole 26 in a combined state. The shape is not particularly limited, and may be changed according to the shape of the through hole 26. The side legs 48a and 48b have an inner concave curved surface shape that matches the shape of the outer peripheral surface of the bobbin main body 24, and the outer surface has a plane parallel to the XZ plane. In the present embodiment, the material of each of the split cores 42a and 42b may be a soft magnetic material such as metal or ferrite, but is not particularly limited.

  In the drawing, the X axis, the Y axis, and the Z axis are perpendicular to each other, and the Z axis coincides with the winding axis (the core of the bobbin 20) of the first wire 37 and the second wire 38 described later, This corresponds to the height (thickness) of the coil device 10. In the present embodiment, the lower side of the coil device 10 in the Z-axis direction is the installation surface (surface of the casing) of the coil device. Further, the Y axis coincides with the longitudinal direction of the split surface 43a of the pair of split cores 42a and 42a or the split surface 43b of the pair of split cores 42b and 42b. Furthermore, the X axis is configured to coincide with the longitudinal direction of the through hole 26.

  As shown in FIG. 3A, at both ends in the Z-axis direction of the winding tube portion 28 of the bobbin 20 in the coil device 10 of the present embodiment, end partition walls 31 and 32 extend radially outward. It is integrally molded substantially parallel to the XY plane. Predetermined in the Z-axis direction so that the winding partition walls 33 to 35 protrude radially outward on the outer peripheral surface of the winding tube portion 28 located between the end partition walls 31 and 32 in the Z-axis direction. It is formed at intervals.

  The winding partition walls 33 to 35 formed between the end partition walls 31 and 32 form winding sections S1 to S4 between these partition walls in order from the top in the Z-axis direction. The In addition, the number of winding partition wall 33-34 and winding division S1-S4 is not specifically limited.

  In the present embodiment, the first wire 37 is continuously wound around the winding sections S1 and S2 by α winding, and the second wire 38 is continuously wound around the sections S3 to S4 by α winding. . In the present embodiment, the first wire 37 constitutes a primary coil and the second wire 38 constitutes a secondary coil, but the reverse may be possible.

  In the present embodiment, as shown in FIG. 3B, the wound partition wall 33 is formed with at least one communication groove 33c that connects the adjacent sections S1 and S2. The first wire 37 in the section S1 is passed through the section S2 through the communication groove 33c, and α winding is enabled on the outer periphery of the winding tube portion 28 of the bobbin 20 in these sections S1 and S2.

  The wound partition wall 35 is formed with at least one communication groove 35c that connects the adjacent sections S3 and S4. The second wire 38 in the section S3 is passed through the section S4 through the communication groove 35c, and α winding is possible on the outer periphery of the winding tube portion 28 of the bobbin 20 in these sections S3 and S4.

  For the winding partition wall 34, in order to insulate the first wire 37 and the second wire 38, it is not necessary to form a communication groove similar to these. In the present embodiment, in order to improve the insulation between the first wire 37 and the second wire 38, the thickness of the winding partition wall 34 in the Z-axis direction is made thicker than the other winding partition walls 33 or 35. It is. In the present embodiment, the communication groove 33c for the first wire 37 and the communication groove 35c for the second wire 38 are formed on the same side in the X-axis direction, but are formed on opposite sides of each other. May be.

  As shown in FIG. 3A, the section width along the Z axis in each section S1, S2 around which the first wire 37 is wound is set to a width that allows only one first wire 37 to enter in the Z axis direction. It is. However, the partition width may be set to a width in which two or more first wires 37 can enter. Further, in the present embodiment, it is preferable that all the partition widths are the same, but they may be slightly different.

  The section width along the Z axis in each of the sections S3 to S4 around which the second wire 38 is wound is set to a width in which only one second wire 38 can enter in the Z axis direction. The wire winding portions can be separated from each other every time. In the present embodiment, the partition width along the Z axis in each of the partitions S <b> 3 to S <b> 4 may be the same as or different from the partition width according to the wire diameter of the second wire 38.

  In addition, the width of the partition walls 31 to 35 (the length in the radial direction with respect to the winding axis) is set to a height at which one (one or more layers) of wires 37 or 38 can enter. The height is preferably set so that 2 to 8 layers of wire can be wound. The heights of the partition walls 31 to 35 are preferably all the same, but may be different. In the present embodiment, the winding method of the wire 37 or 38 wound around each of the sections S1 to S4 is not particularly limited, and normal winding or α winding may be used, but α winding is preferable.

  The wires 37 and 38 may be composed of single wires or may be composed of stranded wires, and are preferably composed of insulation-coated conductive wires. The outer diameters of the wires 37 and 38 are not particularly limited. The second wire 38 may be the same as the first wire 37, but may be different.

  As shown in FIG. 4, bobbin leg portions 32a are integrally formed on both ends in the X-axis direction of the end partition ribs 32 located at the lowest part in the Z-axis direction. Each bobbin leg portion 32a is formed so as to protrude downward in the Z-axis direction from both ends of the end partition wall 32 in the X-axis direction, and heat radiation fins 32b that enhance heat dissipation are formed on the bottom surface of the leg portion 32a. It may be. Or the recessed part may be formed in the bottom face of the leg part 32a, and the heat conductive block may be mounted in the recessed part. You may comprise a heat conductive block with the metal similar to a thermal radiation cover, for example. In the present embodiment, the illustration of the heat radiation cover that covers the core assembly 40 and enhances the heat radiation performance is omitted.

  The bobbin 20 shown in FIG. 4 is made of plastic such as PPS, PET, PBT, LCP, nylon, etc., but may be made of other insulating members. However, in this embodiment, the bobbin 20 is preferably made of a plastic having a high thermal conductivity of, for example, 1 W / m · K or more, and is made of, for example, PPS or nylon.

  As shown in FIGS. 3A and 3B, the bottom surface of the core assembly 40 is preferably in contact with the bottom plate 80 of the case 100. The bottom plate 80 is attached to the bottom of the case 100 so that the case 100 can be filled with a heat transfer resin 90 such as potting resin. The bottom plate 80 is preferably made of the same metal as the heat dissipation cover. Further, the case 100 may be made of the same resin as that of the bobbin 20, but need not be the same resin. Furthermore, the case 100 may be made of metal.

  The potting resin is composed of a soft silicone resin, urethane resin, epoxy resin, or the like even after injection, and the longitudinal elastic modulus of the potting resin is preferably 0.1 to 100 MPa. The heat transfer resin 90 made of potting resin enters the gap between the case 100 and the bobbin 20, the gap between the case 100 and the core assembly 40, and the gap between the bobbin 20 and the core assembly 40. Further, the heat transfer resin 90 made of potting resin also enters the gap between the wires 37 and 38 and the bobbin 20.

  The lead portions 38a and 38b of the second wire 38 disposed below the first wire 37 in the Z-axis direction pass through the outside of the bobbin 20 around which the first wire 37 is wound, and are shown in FIG. It is necessary to face the pedestal 22. Further, in the present embodiment, all the lead portions 37a, 37b, 38a, and 38b are drawn out to the lead base 22 at one end of the bobbin 20 in the X-axis direction. In addition, these lead portions 37a, 37b, 38a, and 38b need to be well insulated from each other.

  In the present embodiment, in order to satisfy these requirements, as shown in FIG. 4, a first pedestal portion 22 a and a second pedestal portion 22 b are integrally formed on the lead base 22. A pair of first lead portions 37a and 37b, which are both ends of the first wire 37 shown in FIG. 5, are disposed on the first base portion 22a so as to be insulated from each other. Moreover, the 2nd base part 22b shown in FIG. 4 is arrange | positioned adjacent to the outer side of a X-axis direction rather than the 1st base part 22a. A pair of second lead portions 38a and 38b which are both ends of the second wire 38 shown in FIG. 5 are insulated from each other and are also insulated from the first lead portions 37a and 37b on the second pedestal portion 22b. The

  In the first pedestal portion 22a shown in FIG. 4, a pair of first lead grooves 22a1, 22a2 through which the pair of first lead portions 37a, 37b shown in FIG. 5 are passed protrudes outward in the X-axis direction. Are insulated from each other. Each of the first lead grooves 22a1 and 22a2 includes a Y-axis direction groove portion that faces the outside opposite to the Y-axis direction, and an X-axis direction groove portion that extends from the inside of each Y-axis direction groove portion toward the outside of the X-axis direction. Each has an L shape. The X-axis direction groove portion of each first lead groove 22a1, 22a2 penetrates the bottom in the Z-axis direction, and the lead-up portions 37c, 37d of the respective lead portions 37a, 37b shown in FIG. It is possible. The portions of the lead portions 37a and 37b shown in FIG. 5 that are ahead of the rising portions 37c and 37d are guided along the first lead grooves 22a1 and 22a2 shown in FIG.

  The second pedestal portion 22b shown in FIG. 4 is formed with a pair of second lead grooves 22b1, 22b2 through which the pair of second lead portions 38a, 38b shown in FIG. The two lead grooves 22b1 and 22b2 are partitioned by insulating walls 22c1 and 22c2 provided on the lead base 22.

  The second lead grooves 22b1 and 22b2 each have a Y-axis direction groove part that faces the outside opposite to the Y-axis direction, and an X-axis direction groove part that faces the outside in the X-axis direction from the inside of each Y-axis direction groove part. And each has an L shape. The X-axis direction groove portions of the second lead grooves 22b1 and 22b2 penetrate the bottom in the Z-axis direction, and the Z-axis rising portions 38c and 38d of the lead portions 38a and 38b shown in FIG. 5 pass therethrough. It is possible. The portions of the lead portions 38a and 38b shown in FIG. 5 that are ahead of the rising portions 38c and 38d are guided along the second lead grooves 22b1 and 22b2 shown in FIG.

  Each of the insulating walls 22c1 and 22c2 has a Y-axis direction wall portion that faces the outer side opposite to the Y-axis direction, and an X-axis direction wall portion that extends from the inner side of each Y-axis direction wall portion to the outer side of the X-axis direction. Each has an L shape. The insulating walls 22c1 and 22c2 ensure insulation between the first lead grooves 22a1 and 22a2 and the second lead grooves 22b1 and 22b2, respectively.

  Engagement grooves 22d1, 22d2 that open to the upper part in the Z-axis direction are formed in the insulating walls 22c1, 22c2 at substantially the same depth (the depth is not limited) as the respective lead grooves 22a1, 22a2, 22b1, 22b2. The insulation creepage distance between the first lead grooves 22a1 and 22a2 and the second lead grooves 22b1 and 22b2 is increased. As shown in FIG. 3C, engaging protrusions 25 a formed integrally with the back surface of the terminal cover 25 are fitted into the engaging grooves 22 d 1 and 22 d 2, and the first lead grooves 22 a 1 and 22 a 2 are connected to the second leads. The insulation between the grooves 22b1 and 22b2 is further increased.

  A lead guide cover 60 shown in FIG. 5 is attached to the outer periphery of the bobbin 20 where the lead base 22 shown in FIG. 4 is located. The cover 60 includes a pair of first lead portions 37a and 37b of the first wire 37 on the way from the outer periphery of the bobbin 20 shown in FIG. 4 to the lead base 22, and the lead base from the outer periphery of the bobbin 20 shown in FIG. 22 is insulated from the pair of second lead portions 38a and 38b of the second wire 38 in the middle of the direction. That is, the rising portions 37c and 37d of the first lead portions 37a and 37b are insulated from the rising portions 38c and 38d of the second lead portions 38a and 38b.

  Further, as shown in FIG. 5, the lead guide cover 60 has a cover body 62. The cover main body 62 mainly insulates the rising portions 37c and 37d of the first lead portions 37a and 37b and the rising portions 38c and 38d of the second lead portions 38a and 38b. A bulging portion 64 is integrally formed on the cover main body 62 on the outer side in the X-axis direction. The bulging portion 64 protrudes in a frame shape outside the X-axis direction, and has a trapezoidal shape that is upside down when viewed from the X-axis direction. A pair of guide edge plates 66 are formed integrally with the cover main body 62 so as to form the grooves 68a and 68b. The guide cover 60 is made of, for example, the same plastic as the bobbin 20, but is not necessarily the same.

  The second lead intermediate grooves 68a and 68b provided on both sides of the bulging portion 64 are formed on the rising portions 38c and 38d of the pair of second lead portions 38a and 38b of the second wire 38, as shown in FIG. From the outer periphery to the lead pedestal 22, they are guided in directions away from each other. That is, the second lead intermediate grooves 68a and 68b are inclined substantially in a V shape when viewed from the X-axis direction.

  The lead guide cover 60 shown in FIG. 5 has the first wire 37 and the second wire 38 shown in FIG. 4 on the outer periphery of the bobbin 20 at the lower portion in the Z-axis direction of the lead base 22 shown in FIG. It is attached after being wound around the outer periphery of the winding tube portion 28 of the bobbin 20. As shown in FIG. 4, an extended flange 35 a extending outward in the X-axis direction is integrally formed with the winding partition wall 35 on the outer periphery of the bobbin 20 where the lead base 22 is located. In addition, an extended hook part 34 a extending outward in the X-axis direction is also integrally formed with the winding partition wall hook part 34. Further, the winding partition wall 33 is also integrally formed with an extended flange 33a extending outward in the X-axis direction.

  Cutouts 33b to 35b are formed in the extended flange portions 33a to 35a located below the lead base 22 in the Z-axis direction, and the back of the lead guide cover 60 shown in FIG. Can be attached. Further, as shown in FIG. 3B, an engaging convex portion 63 is integrally formed on the back surface (inner side) of the lead guide cover 60, and the convex portion 63 is an X of the extended flange portion 34 a of the winding partition wall rib 34. The insulation between the first wire 37 and the second wire 38 is enhanced by fitting in the fitting groove 34d formed on the shaft end edge.

  Further, in the extended flange portion 35a of the winding partition wall 35 shown in FIG. 4, the portions 38e and 38f immediately before the pair of second lead portions 38a and 38b shown in FIG. 5 are separated from each other in the Z-axis direction and insulated. , After crossing when viewed from the Z-axis direction, the lead guide cover 60 shown in FIG. 5 is guided to the second lead intermediate grooves 68a and 68b. Note that the portions 38e and 38f immediately before taking out of the pair of second lead portions 38a and 38b shown in FIG. 5 are separated from each other in the Z-axis direction and insulated from each other in the extended flange portion 35a of the winding partition wall 35, and from the Z-axis direction. It is clear from FIG. 6 that they intersect when seen. The portions 38e and 38f immediately before extraction are portions immediately before the extraction of the second lead portions 38a and 38b that are extracted from the second wire 38 wound around the outer periphery of the bobbin 20 toward the lead base 22.

  As shown in FIG. 6, in the present embodiment, one of the pair of first lead portions 37 a and 37 b and one of the pair of second lead portions 38 a and 38 a are separated from the lead base 22. They are pulled out to the outside in the Y-axis direction. Further, the other 37b of the pair of first lead portions 37a and 37b and the other 38b of the pair of second lead portions 38a and 38a are pulled out from the lead base 22 side by side in the Y-axis direction. . The lead direction of these one lead portions 37a and 38a and the lead direction of the other lead portions 37b and 38b are opposite to each other along the Y-axis direction.

  In the coil device 10 of the present embodiment, as shown in FIG. 2, each of the split cores 42a and 42a has a middle leg portion 46a and a pair of outer leg portions 48a. Each of the split cores 42b and 42b has a middle leg portion 46b and a pair of outer leg portions 48b.

  In the coil device 10 of the present embodiment, in order to form the gap gap 47 shown in FIGS. 3A and 3B, the protruding length of the middle leg portion 46a in the Z-axis direction is made longer than the protruding length of the outer leg portion 48a in the Z-axis direction. Is also molded short. Nevertheless, in the coil device 10 of the present embodiment, it is easy to stand alone by the split core 42a, and the split core 42a can be easily attached to the bobbin 20. Further, the split core 42a is not disposed to be inclined with respect to the bobbin 20, and a constant gap gap 47 can be easily formed.

  In addition, the gap 47 for gaps easily passes through the split gap between the split faces 43a and 43a of the split cores 42a and 42a and the split gap between the split faces 43b and 43b of the split cores 42b and 42b. Flows into the gap 47 and is filled with the heat transfer resin. The porosity of the heat transfer resin 90 filled in the gap gap 47 is preferably 5% by volume or less. The heat transfer resin 90 filled in the gap gap 47 allows heat to escape from the tip end portions of the middle leg portions 46a and 46b where heat is most easily trapped to the outside of the core assembly 40, thereby improving heat dissipation.

  In addition, since the bottom plate 80 of the case 100 is made of metal and the bottom surface of the core assembly 40 is in contact with the bottom plate 80 of the case 100, the heat inside the core assembly 40 is generated by the bottom plate of the case 100. Heat is transferred directly to the housing through 80 and radiated there. The heat inside the core assembly 40 is transmitted to the housing through the heat conductive resin 90 with which the core assembly 40 is in contact and the bottom plate 80 of the case 100 with which the core assembly 40 is in contact. . Therefore, it is possible to cope with an increase in current of the coil device 10, the heat dissipation is improved, and the deterioration of the magnetic characteristics due to overheating of the coil portion can be suppressed.

  In the present embodiment, the pair of split cores 42a, 42a are arranged such that the respective split surfaces 43a face each other with a predetermined split gap, and the heat transfer resin 90 enters the gap gap 47 through the split gap, thereby dividing the split core 43a. The gap for gap and the gap for gap 47 are filled with the heat conductive resin 90.

  In this embodiment, the length along the X-axis (first axis) direction of the bobbin 20 is longer than the length along the Y-axis (second axis) direction intersecting the X-axis, and the bobbin 20 is in the X-axis direction. Bobbin leg portions 32a are provided at the bottoms of the both ends. The split surfaces 43a, 43a and 43b, 43b of the core assembly 40 are formed along the Z axis (third axis) and the Y axis. By forming the bobbin leg portion 32a and bringing the bobbin leg portion 32a into contact with or close to the bottom plate 80 of the case 100, it is possible to secure a heat transfer path from the bobbin 20 toward the bottom plate 80 of the case 100. Is further improved.

  The split surfaces 43a, 43a and 43b, 43b of the split cores 42a, 42a and 42b, 42b of the present embodiment are formed along the Y axis that intersects the X axis parallel to the direction connecting the pair of bobbin legs 32a. Thus, the bobbin leg 32a and the bobbin collar 32 integrated with the bobbin leg 32a do not get in the way.

  Therefore, the heat transfer resin 90 easily enters the gap gap 47 through the gaps between the divided surfaces 43a, 43a and 43b, 43b of the divided cores 42a, 42a and 42b, 42b. Further, as shown in FIG. 2, the bobbin 20 is short in the Y-axis direction, so that the distance from the outside of the bobbin 20 to the middle legs 46a of the split cores 42a and 42a is also short. Also from this point, the heat transfer resin 90 easily enters the gap gap 47 through the gap between the divided surfaces 43a, 43a and 43b, 43b.

  Further, in the present embodiment, the divided leg portions 46a and 46b of the divided cores 42a and 42b are inserted into the core leg through hole 26 of the bobbin 20. According to experiments by the present inventors, even if the core becomes large by such a configuration, compared with the case where a conventional E-type core is used, at the intersection of the middle leg and the base The generated local stress can be dispersed. Therefore, in the coil device 10 according to the present embodiment, it is possible to effectively suppress the occurrence of cracks or the like even when thermal stress is generated in the core.

  Further, the middle leg portions 46a and 46b and the base portions 44a and 44b in the E-type core configured by combining the split cores 42a and 42b are separated by the split surfaces 43a and 43b of the split cores 42a and 42b. A predetermined gap can be formed between the surfaces 43a and 43b, and heat dissipation is improved. Furthermore, the E-type core is configured by combining a pair of split cores 42a and 42b each having a simple shape, which facilitates the manufacture of the core and reduces the manufacturing cost. Moreover, since the split E-type core as a whole has the same magnetic field lines as the E-type core, the magnetic properties of the core are equivalent to those of a general E-type core.

  In particular, in the coil device 10 of the present embodiment, the pair of first lead portions 37a and 37b of the first wire 37 and the first lead portions 37a and 37b from the lead base 22 provided at one end portion of the bobbin 20 instead of from both sides of the bobbin 20. The pair of second lead portions 38a and 38b of the two wires 38 are pulled out. For this reason, it becomes easy to bring the coil device 10 that requires heat dissipation to one side instead of the center of the circuit board, the heat dissipation structure is simplified, and the heat dissipation characteristics are improved. Further, even when the coil device 10 is moved to the end of the circuit board or the circuit element group, the first lead portions 37a and 37b and the second lead portions 38a and 38b can be pulled out from the lead base 22 at one end portion. This is possible, the resistance for the wiring does not increase, and the inductance is stabilized. Further, the low resistance and low loss coil device 10 can be realized at a low cost.

  In the present embodiment, the first wire 37 and the second wire 38 are wound around the outer periphery of the bobbin 20 in order from the vicinity of the lead pedestal 22 along the Z axis, rather than the first pedestal portion 22a. The second pedestal portion 22b is disposed outside along the X axis. With this configuration, the first lead portions 37a and 37b and the second lead portions 38a and 38b are well insulated, and the lead base 22 can be disposed at one end of the bobbin 20. It becomes easy.

  In this embodiment, a lead guide cover 60 is mounted on the outer periphery of the bobbin main body 24 of the bobbin 20 where the lead base 22 is located. With this configuration, the insulation between the first lead portions 37a and 37b and the second lead portions 38a and 38b is ensured, and the lead base 22 is provided at one end of the bobbin 20 in the X-axis direction. It becomes easy to arrange.

  Further, in the present embodiment, as shown in FIG. 5, the lead guide cover 60 is provided with a pair of second lead portions 38 a and 38 b of the second wire 38 from the outer periphery of the bobbin 20 toward the lead base 22. Second lead intermediate grooves 68a and 68b for guiding in directions away from each other are provided. With this configuration, the second lead portions 38 a and 38 b of the second wire 38 wound around the outer periphery of the bobbin main body 24 on the side far from the lead base 22 are replaced with the first lead portion 37 a of the first wire 37. , 37b and the lead wire 22 can be easily guided while preventing the second wire 38 from being unwound. As a result, the inductance can be stabilized. Further, the resistance reduction and loss reduction of the coil device 10 can be further improved.

  A pair of second lead portions 38 are separated from each other in the Z-axis direction and insulated from each other on the outer periphery of the bobbin main body 24 where the lead pedestal is located, and crossed when viewed from the axial direction. An extension hook 35a is provided for guiding to the above. With this configuration, the second lead portions 38 a and 38 b of the second wire 38 wound around the outer periphery of the bobbin main body 24 on the side far from the lead base 22 are replaced with the first lead portion 37 a of the first wire 37. , 37b and the lead wire 22 can be easily guided while preventing the second wire 38 from being unwound. As a result, the inductance can be stabilized. Further, the resistance reduction and loss reduction of the coil device 10 can be further improved.

  Since the first wire 37 is wound around the outer periphery of the bobbin body 24 on the side close to the lead base 22, the first lead portions 37 a and 37 b of the first wire 37 are the second leads of the second wire 38. Unlike the portions 38a and 38b, the first wire 37 can be easily guided to the lead base 22 while preventing the first wire 37 from unwinding without overlapping each other when viewed from the Z-axis.

  Furthermore, in this embodiment, as shown in FIG. 5, one of the pair of first lead portions 37a and 37b and one of the pair of second lead portions 38a and 38b are connected to the lead base 22. To the outside in the Y-axis direction. Further, the other 37b of the pair of first lead portions 37a and 37b and the other 38b of the pair of second lead portions 38a and 38b are pulled out side by side from the lead base 22 in the Y-axis direction. . These orientations are opposite to each other along the Y axis.

  With this configuration, for example, as shown in the circuit shown in FIG. 7, one of the pair of first lead portions 37a and 37b and one of the pair of second lead portions 38a and 38b are connected to each other. It is possible to easily connect, and a specific circuit for non-contact power feeding can be easily configured. Note that the other 37b of the pair of first lead portions 37a and 37b may be connected to the other 38b of the pair of second lead portions 38a and 38b.

  In the coil device 10 of the present embodiment, as shown in FIG. 8, routing grooves 22f1 and 22f2 are provided in the middle of the second lead grooves 22b1 and 22b2 of the second pedestal portion 22b, and the second leads are provided there. You may make it pull out these to the outer side of a X-axis direction through the part 38a, 38b. In accordance with this, the first lead portions 37a and 37b drawn from the first lead grooves 22a1 and 22a2 of the first base portion 22a may also be drawn to the outside in the X-axis direction. Even in this case, the first lead portion 37a and the second lead portion 38a are drawn out in parallel, and the first lead portion 37b and the second lead portion 38b are drawn out in parallel.

Second Embodiment As shown in FIGS. 9A to 11, a coil device 110 according to a second embodiment of the present invention is the same as the coil device 10 of the first embodiment described above except for the following, and is common. Description of the parts to be performed is omitted. Further, in the drawings, common reference numerals are given to members or parts common to the first embodiment.

  The coil device 110 according to the present embodiment is different from the coil device 10 according to the first embodiment described above in the configuration of the bobbin 120. Further, the coil device 110 may not include the case 100 shown in FIG. The bobbin 120 has a lead base 122 and an auxiliary base 123. These pedestals 122 and 123 have a lower height in the Z-axis direction than the pedestals 22 and 23 of the first embodiment, and contribute to the reduction in the height of the coil device 110.

  In the present embodiment, lead portions 37 a and 37 b of the first wire 37 and lead portions 38 a and 38 b of the second wire 38 are attached to the lead base 122. A terminal cover (corresponding to the terminal cover 25 shown in FIG. 2) (not shown) is attached to the upper portion of the lead base 122 to which these lead portions 37a, 37b, 38a, 38b are attached. Also in this embodiment, no lead portion of any wire is attached to the auxiliary base 123.

  A pair of partition covers 50 (see FIG. 10) are attached to both sides of the bobbin main body 124 in the Y-axis direction. In FIG. 9A, the core assembly is not shown, but the core assembly 40 as shown in FIG.

  In the present embodiment, as shown in FIG. 11, a first pedestal portion 122 a and a second pedestal portion 122 b are integrally formed on the lead base 122. In the present embodiment, the second pedestal portion 122b is disposed so as to surround the first pedestal portion 122a on one side in the X-axis direction and on both sides in the Y-axis direction.

  A pair of first lead portions 37a and 37b, which are both ends of the first wire 37 shown in FIG. 9B, are arranged on the first base portion 122a so as to be insulated from each other. Moreover, the 2nd base part 122b shown in FIG. 11 is arrange | positioned adjacent to the both sides of the Y-axis direction of the 1st base part 122a. A pair of second lead portions 38a and 38b, which are both ends of the second wire 38 shown in FIG. 9B, are insulated from each other and are also insulated from the first lead portions 37a and 37b on the second pedestal portion 122b. The

  A pair of first lead grooves 122a1 and 122a2 through which the pair of first lead portions 37a and 37b shown in FIG. 9B are passed through the first pedestal portion 122a shown in FIG. 11 are separated protrusions 122e protruding outward in the X-axis direction. Are insulated from each other. Each of the first lead grooves 122a1 and 122a2 includes a Y-axis direction groove portion that faces the outer side opposite to the Y-axis direction, and a pair of X-axis direction groove portions that extend outward from the both sides of each Y-axis direction groove portion in the X-axis direction. Are each substantially U-shaped.

  The X-axis direction groove portion located inside the Y-axis direction of each of the first lead grooves 122a1 and 122a2 has a bottom passing through in the Z-axis direction, and the Z-axis direction of each of the lead portions 37a and 37b shown in FIG. 9B. The rising portions 37c and 37d can pass therethrough. The portions ahead of the rising portions 37c and 37d of the lead portions 37a and 37b shown in FIG. 5 are outside the X-axis direction (the direction away from the bobbin 120) along the first lead grooves 122a1 and 122a2 shown in FIG. )

  The second pedestal portion 122b shown in FIG. 11 has a pair of second lead grooves 122b1 and 122b2 through which the pair of second lead portions 38a and 38b shown in FIG. The two lead grooves 122b1 and 122b2 are partitioned by a substantially C-shaped insulating wall 122c provided on the lead base 122.

  The second lead grooves 122b1 and 122b2 respectively located on both sides of the first pedestal portion 122a in the Y-axis direction are formed from the Y-axis direction groove portions that face each other outward in the Y-axis direction and from both sides of each Y-axis direction groove portion. And a pair of X-axis direction groove portions facing outward in the X-axis direction, each having a substantially U shape. The bottom of the X-axis direction groove portion located inside each of the second lead grooves 122b1 and 122b2 penetrates in the Z-axis direction, and the lead-up portions 38c in the Z-axis direction of the lead portions 38a and 38b shown in FIG. 9B. , 38d can pass through. The portions of the lead portions 38a and 38b shown in FIG. 9B ahead of the rising portions 38c and 38d are guided outward in the X-axis direction along the second lead grooves 122b1 and 122b2 shown in FIG.

  The insulating wall 22c includes a Y-axis direction wall portion and a pair of X-axis direction wall portions that extend from both sides of the Y-axis direction wall portion toward the outside in the X-axis direction, and has a substantially U shape. The insulating wall 122c ensures insulation between the first lead grooves 122a1 and 122a2 and the second lead grooves 122b1 and 122b2.

  In the insulating wall 122c, an engagement groove 122d that opens at the top in the Z-axis direction is formed with substantially the same depth (the depth is not limited) as the bottomed lead grooves 122a1, 122a2, 122b1, and 122b2. The insulation creepage distance between the first lead grooves 122a1 and 122a2 and the second lead grooves 122b1 and 122b2 is increased. Engaging protrusions 25a formed integrally with the back surface of the terminal cover 25 shown in FIG. 3C are fitted into the engaging grooves 122d1 and 122d2, and the first lead grooves 122a1 and 122a2 and the second lead grooves 122b1 and The insulation with 122b2 is further increased.

  A lead guide cover 160 shown in FIG. 9B is attached to the outer periphery of the bobbin 120 where the lead base 122 shown in FIG. 11 is located. The one cover 160 includes a pair of first lead portions 37a and 37b (see FIG. 9B) of the first wire 37 on the way from the outer periphery of the bobbin 20 shown in FIG. 11 to the lead base 122, and the bobbin 120 shown in FIG. A pair of second lead portions 38a and 38b (see FIG. 9B) of the second wire 38 on the way from the outer periphery to the lead pedestal 122 is insulated. That is, the rising portions 37c and 37d of the first lead portions 37a and 37b are insulated from the rising portions 38c and 38d of the second lead portions 38a and 38b.

  Further, as shown in FIG. 9B, the lead guide cover 160 has a cover body 162. The cover main body 162 mainly insulates the rising portions 37c and 37d of the first lead portions 37a and 37b and the rising portions 38c and 38d of the second lead portions 38a and 38b. The cover main body 162 is integrally formed with an insulating partition wall 164 on the outer side in the X-axis direction. The insulating partition wall 164 protrudes outward in the X-axis direction, and a pair of guide edge plates 166 are integrated with the cover body 162 so as to form second lead intermediate grooves 168a and 168b on both sides when viewed from the X-axis direction. Molded. The guide cover 160 is made of, for example, the same plastic as the bobbin 120, but is not necessarily the same.

  The second lead intermediate grooves 168a and 168b provided on both sides of the partition wall 164 are provided with the rising portions 38c and 38d of the pair of second lead portions 38a and 38b of the second wire 38 shown in FIG. As shown, the guides are guided from the outer periphery of the bobbin 120 toward the lead base 122 in directions away from each other. That is, the second lead intermediate grooves 168a and 168b are inclined in a substantially V shape when viewed from the X-axis direction.

  The lead guide cover 160 is wound around the outer periphery of the bobbin 120 at the lower portion in the Z-axis direction of the lead base 122 shown in FIG. 9A, and the first wire 37 and the second wire 38 shown in FIG. 9B are wound around the bobbin 120 shown in FIG. It is attached after being wound around the outer periphery of the rotating cylinder portion 28. As shown in FIG. 10, the portions 38e, 38f immediately before the pair of second lead portions 38a, 38b are separated from each other in the Z-axis direction and insulated, and the second lead portions 38a, 38b are viewed from the Z-axis direction. Without crossing, it is hooked on each guide inclined wall 166a of the guide cover 160 and guided to the second lead intermediate grooves 168a and 168b.

  As shown in FIGS. 9A and 9B, in this embodiment, the pair of first lead portions 37a and 37b and the pair of second lead portions 38a and 38a on both sides in the Y-axis direction are separated from the lead base 122. , They are all pulled out side by side in the X-axis direction.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

  For example, in the above-described embodiment, the core assembly 40 includes the upper core 40a and the lower core 40b, and each of the core assemblies 40 includes the split cores 42a and 42b. However, at least one of the upper core and the lower core is What is necessary is just to have a pair of division | segmentation core 42a, 42a or 42b, 42b. In particular, by dividing the upper core 40a in the dividing direction along the Y-axis direction, it becomes easy to attach the divided cores 42a and 42a to the bobbin 20 without tilting, and the predetermined gap gap 47 shown in FIG. Can be easily formed.

  The number of divisions in the core assembly 40 is not particularly limited, and the upper core 40a may be divided into two or more divisions in the X-axis direction, and the lower core 40b is divided into two or more divisions in the X-axis direction. May be. The division is division along the direction from one outer leg portion 48a, 48b of the core assembly 40 to the other outer leg portion 48a, 48b through the middle leg portions 46a, 46b, and crosses these directions. It is not a division.

  In the present embodiment, either the upper core or the lower core may be a plate core, and the plate core may be divided or may not be divided. As in the above-described embodiment, preferably, both the upper core 40a and the lower core 40b are divided into two or more.

  In the above-described embodiment, the larger the number of divisions of the upper core or the lower core, the more the core loss is reduced and the division gaps into which the heat transfer resin 90 enters tend to increase. The number of divisions is preferably 2 to 4 in each of the upper core 40a and the lower core 40b. By setting the number of divisions within such a range, the core loss is reduced and the heat transfer resin 90 is likely to enter the center of the core assembly 40, improving heat transfer and securing sufficient inductance. be able to.

  Further, in the present embodiment, the shape and structure of the bobbin 20, the number of windings and the winding method of the wires 37 and 38 are not limited to the illustrated embodiment, and various modifications may be made. Further, the bottom plate 80 may be provided with a heat sink such as a heat radiating fin.

  Furthermore, in the embodiment described above, the gap gap 47 is formed at the protruding tip of the middle legs 46a, 46b. However, in the coil device 10 of this embodiment, the gap gap 47 need not be formed. In the above-described embodiment, the core assembly 40 is divided into a plurality in the X-axis direction, but may be divided into a plurality in the Y-axis direction.

DESCRIPTION OF SYMBOLS 10,110 ... Coil apparatus 20,120 ... Bobbin 22,122 ... Lead base 22a, 122a ... First base part 22a1, 22a2, 122a1, 122a2 ... First lead groove 22b, 122b ... Second base part 22b1, 22b2, 122b1, 122b2 ... 2nd lead groove 22c1, 22c2, 122c ... Insulating wall 22d1, 22d2, 122d ... Engagement groove 22e, 122e ... Separation protrusion 22f1, 22f2 ... Routing groove 23, 123 ... Auxiliary base 24, 124 ... Bobbin body 25 ... Terminal cover 25a ... Engaging convex part 26 ... Core leg through hole 28 ... Winding cylinder part 31, 32 ... End partition wall 32a ... Support leg 32b ... Radiation fin 33-35 ... Winding partition wall 34a ... Extension collar part 34b ... Notches 34c, 34d ... Fitting groove 35a ... Extension collar part 35b ... Notch 37 ... 1st wire 38 ... 2nd wire 40 ... Core assembly 40a ... Upper core 40b ... Lower core 42a, 42b ... Split core 43a, 43b ... Split surface 44a, 44b ... Base part 46a, 46b ... Middle leg part 47 ... Gap gaps 48a, 48b ... Side legs 50 ... Partition cover 52 ... Cover body 54 ... Locking piece 56 ... Side leg guide piece 58 ... Fitting piece 60, 160 ... Lead guide cover 62, 162 ... Cover body 63 ... fitting convex part 64 ... bulging part 164 ... partition walls 66, 166 ... guide edge plate 166a ... guide inclined walls 68a, 68b, 168a, 168b ... second lead intermediate groove 80 ... bottom plate 90 ... heat transfer resin (potting resin) )
100 ... Case

Claims (10)

A first wire wound around the outer periphery of the bobbin;
A second wire insulated from the first wire and wound around the outer periphery of the bobbin;
A lead pedestal provided at one end of one side along a first axis substantially perpendicular to the axis of the bobbin,
The lead base is
A first pedestal portion in which a pair of first lead portions which are both ends of the first wire are arranged to be insulated from each other;
A second pedestal portion disposed adjacent to the first pedestal portion, wherein a pair of second lead portions which are both ends of the second wire are insulated from each other and insulated from the first lead portion; Coil device having. A pair of first lead grooves through which the pair of first lead portions are passed are formed in the first pedestal portion,
The second pedestal portion is formed with a pair of second lead grooves through which the pair of second lead portions pass.
The coil device according to claim 1, wherein the first lead groove and the second lead groove are partitioned by an insulating wall provided in the lead base.   3. The coil device according to claim 1, wherein the first wire and the second wire are wound around the outer periphery of the bobbin in order from the vicinity of the lead base along the axis.   A lead guide cover is attached to the outer periphery of the bobbin where the lead pedestal is located, and a pair of first lead portions of the first wire on the way from the outer periphery of the bobbin to the lead pedestal, The coil device according to any one of claims 1 to 3, wherein a pair of second lead portions of the second wire on the way from the outer periphery of the bobbin toward the lead base are insulated.   The lead guide cover includes second lead intermediate grooves that guide the pair of second lead portions of the second wire from the outer periphery of the bobbin toward the lead base in directions away from each other. The coil device according to claim 4.   On the outer periphery of the bobbin where the lead pedestal is located, a pair of second lead parts are separated and insulated from each other in the axial direction, and crossed when viewed from the axial direction, the lead guide cover The coil device according to claim 4, further comprising a flange portion that guides the wire.   The lead guide cover includes a guide inclined wall that guides the lead guide cover to the lead guide cover without intersecting the pair of second lead portions when viewed from the axial direction. The coil device according to 4 or 5. One of the pair of first lead portions and one of the pair of second lead portions are pulled out side by side from the lead base,
The coil device according to any one of claims 1 to 7, wherein the other of the pair of first lead portions and the other of the pair of second lead portions are pulled out side by side from the lead base. A core assembly partially attached to a through-hole formed along the axial center of the bobbin;
A case covering the outer periphery of the bobbin to which the core assembly is attached by winding the first wire and the second wire;
A heat transfer resin accommodated in the case and capable of entering a gap between the case and the bobbin, a gap between the case and the core assembly, and a gap between the bobbin and the core assembly; The coil device according to any one of claims 1 to 8, further comprising: The core assembly has at least a pair of split cores divided by a split surface;
These divided cores are respectively integrated into a middle leg portion that enters the through hole of the bobbin, a base portion that is integrated with the middle leg portion and located outside the through hole, and both sides of the base portion. And an outer leg attached to the outside of the bobbin,
The projection length of the middle leg portion from the base portion is shorter than the projection length of the outer leg portion from the base portion,
The coil apparatus according to claim 9, wherein a gap gap formed at a protruding tip of the middle leg portion is filled with the heat conductive resin.

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