JP2014160737A - Coil device - Google Patents

Coil device Download PDF

Info

Publication number
JP2014160737A
JP2014160737A JP2013030363A JP2013030363A JP2014160737A JP 2014160737 A JP2014160737 A JP 2014160737A JP 2013030363 A JP2013030363 A JP 2013030363A JP 2013030363 A JP2013030363 A JP 2013030363A JP 2014160737 A JP2014160737 A JP 2014160737A
Authority
JP
Japan
Prior art keywords
core
coil
axis direction
bobbin
formed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2013030363A
Other languages
Japanese (ja)
Other versions
JP6094251B2 (en
Inventor
Masaaki Iwakura
正明 岩倉
Kazumi Kobayashi
一三 小林
Original Assignee
Tdk Corp
Tdk株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tdk Corp, Tdk株式会社 filed Critical Tdk Corp
Priority to JP2013030363A priority Critical patent/JP6094251B2/en
Publication of JP2014160737A publication Critical patent/JP2014160737A/en
Application granted granted Critical
Publication of JP6094251B2 publication Critical patent/JP6094251B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Abstract

An object of the present invention is to provide a coil device capable of reliably holding each divided core piece even if it is a divided core piece and having excellent heat dissipation.
A core includes a split core piece separated along a first axis direction among a first axis, a second axis, and a third axis perpendicular to each other, and the case includes a split core piece. A spring member that is pressed downward along the third axis is attached in the case, and a slit is formed along the second axis direction in the spring member to form a first pressing piece and a second pressing piece. In the first pressing piece and the second pressing piece, elastic bent portions that contact the respective split core pieces are formed so as to be displaced along the second axial direction.
[Selection] Figure 1A

Description

  The present invention relates to a coil device that can be suitably used as a reactor, a transformer, or the like.

  In a coil device used as a reactor, a transformer, or the like, for example, as shown in Patent Document 1 below, the coil device may be resin-sealed.

  On the other hand, as a core of a relatively large coil device used for applications such as in-vehicle use, use of an E-type core has been studied for reasons such as downsizing, noise reduction, cost reduction, and workability.

  However, when an E-type core is used, the mid-leg in the E-type core is caused by concentration of thermal stress due to a difference in heat dissipation between the middle leg of the core and the outer leg of the core, resulting in a temperature difference. It has been found by the present inventors that there is a problem that cracks are likely to occur at the intersection between the base and the base.

  Therefore, the present inventors have proposed that a core such as an E-type core is constituted by a split core piece and has filed an application earlier. However, in such a split core piece, the holding of the split core piece and heat dissipation are problems.

  For example, as shown in Patent Document 2 below, when the core is entirely covered and integrated with a resin, elastic holding to cover the entire upper part of the coil using a leaf spring is the holding of the coil. There is no problem in terms. However, when the upper part of the core is not covered with resin and the core is divided, it is difficult to elastically hold the whole upper part of the coil using a leaf spring.

  Because, due to dimensional variations in each of the divided cores, even if the entire upper part of these divided cores is covered, a gap is created between any of the cores and the leaf spring, so that the core is securely held. Difficult to do. In addition, the structure in which the entire upper surface of the core is covered with a leaf spring has a problem that heat dissipation becomes worse.

JP 2010-267932 A JP 2007-227640 A

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device that can reliably hold each divided core piece even if it is a divided core piece and that is excellent in heat dissipation. That is.

In order to achieve the above object, a coil device according to the present invention comprises:
A coil assembly having a core, a bobbin, and a coil attached to an outer periphery of the bobbin;
A case for holding the coil assembly;
A coil device comprising:
The core has divided core pieces separated along the first axis direction among the first axis, the second axis, and the third axis perpendicular to each other,
A spring member is attached to the case,
In the spring member, a slit is formed along the second axial direction, and a first pressing piece and a second pressing piece are formed,
In the first pressing piece and the second pressing piece, elastic bent portions that press the respective divided core pieces downward along the third axis with respect to the case are displaced in the second axial direction. It is characterized by being formed.

  In the coil device according to the present invention, since the core is formed of the split core pieces, the thermal stress generated in the core can be reduced. Therefore, in the coil device according to the present invention, it is possible to effectively suppress the occurrence of cracks and the like even when thermal stress is generated in the core.

  Further, in the present invention, the core is configured by combining a pair of split core pieces each having a simple shape, so that the core can be easily manufactured and the manufacturing cost can be reduced. Moreover, since the split core according to the present invention has the same magnetic field lines as the core before splitting as a whole, the magnetic characteristics of the core are equivalent to those of a general core before splitting.

  Furthermore, in the present invention, a slit is formed in a single spring member to form a first pressing piece and a second pressing piece, and the first pressing piece and the second pressing piece include the respective divided core pieces. The elastic bending part which contacts is formed in a position shift along the second axial direction. For this reason, in the present invention, even if there is a dimensional variation in each of the divided divided core pieces, the elastic bent portions of the respective pressed pieces are elastically pressed so that each divided core piece is securely held. Is possible. Moreover, since the elastic bending part of each press piece contacts the division | segmentation core piece, and the other part of a spring member does not contact a core piece, it is excellent also in heat dissipation.

  Furthermore, since the slit is formed in the single spring member and the first pressing piece and the second pressing piece are formed, the first pressing piece and the second pressing piece are formed at both ends of the spring member. Are continuous by the connecting end. Therefore, by fixing the connecting end portions formed at both ends of the spring member to the case, the spring member can be attached, and the attaching operation is easy.

  At least a lower part of the coil assembly along the third axial direction may be in contact with the heat radiation resin accommodated in the case. By contacting the heat-dissipating resin, the heat dissipation of the core is further improved.

  A predetermined gap may be formed between the split surfaces of the split core pieces. By forming the predetermined gap, heat dissipation is improved. Although it does not specifically limit with a predetermined clearance gap, Preferably it is 0.05-5 mm, More preferably, it is 0.1-3 mm. These predetermined gaps are not necessarily formed on the entire surface between the divided surfaces of the divided core pieces.

  A heat radiating sheet may be interposed in at least a part of the predetermined gap. By interposing the heat dissipation sheet, the heat dissipation performance is further improved.

  The core may have an E-type core, and the E-type core may be constituted by the divided core pieces. By configuring the E-type core with the split core pieces, the heat dissipation of the middle leg in the E-type core is improved.

FIG. 1A is a perspective view of a coil device according to an embodiment of the present invention. FIG. 1B is a perspective view of the coil device with the case shown in FIG. 1A removed. 1C is a perspective view of the leaf spring member shown in FIG. 1A. 1D (A) is a plan view of the leaf spring member shown in FIG. 1A, FIG. 1D (B) is a front view thereof, FIG. 1D (C) is a rear view thereof, FIG. 1D (D) is a right side view thereof, and FIG. (E) is the left side view, and FIG. 1D (F) is the bottom view. FIG. 2 is an exploded perspective view excluding the case of the coil device shown in FIG. 3A is a cross-sectional view of the main part excluding the leaf spring member along the line IIIA-IIIA shown in FIG. 1A. FIG. 3B is a cross-sectional view of the main part excluding the leaf spring member along the line IIIB-IIIB shown in FIG. 1A. 3C is a cross-sectional view of a main part including a leaf spring member taken along line IIIC-IIIC shown in FIG. 1A. FIG. 4 is a perspective view of only the core shown in FIG. FIG. 5 is a schematic view showing the relationship between the primary coil and the secondary coil in the coil device shown in FIG. FIG. 6 is a schematic diagram showing the dimensional relationship of the partition walls shown in FIG. FIG. 7 is a schematic view showing a relationship between a primary coil and a secondary coil in a coil device according to another embodiment of the present invention. FIG. 8 is an overall perspective view of the coil device according to the embodiment shown in FIG. FIG. 9A is a schematic diagram illustrating a relationship between a primary coil and a secondary coil in a coil device according to still another embodiment of the present invention. FIG. 9B is a schematic diagram illustrating a relationship between a primary coil and a secondary coil in a coil device according to still another embodiment of the present invention. FIG. 9C is a schematic diagram illustrating a relationship between a primary coil and a secondary coil in a coil device according to still another embodiment of the present invention. FIG. 10 is a cross-sectional view of a main part of a coil device according to another embodiment of the present invention. FIG. 11 is a perspective view of a coil device according to still another embodiment of the present invention. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. It is. FIG. 13 is an exploded perspective view excluding a case of a coil device according to another embodiment of the present invention. 14A is a cross-sectional view of main parts of the coil device shown in FIG. 13, and is a cross-sectional view corresponding to FIG. 3A. 14B is a cross-sectional view of main parts of the coil device shown in FIG. 13, and is a cross-sectional view corresponding to FIG. 3B. FIG. 15A is a cross-sectional view of a heat dissipation sheet used in a coil device according to still another embodiment of the present invention. FIG. 15B is a cross-sectional view of a heat dissipation sheet used in a coil device according to still another embodiment of the present invention. FIG. 16 is a perspective view of a leaf spring member according to another embodiment of the present invention. 17A is a plan view of the leaf spring member shown in FIG. 16, FIG. 17B is a front view thereof, FIG. 17C is a rear view thereof, FIG. 17D is a right side view thereof, FIG. (E) is the left side view, and FIG. 17 (F) is the bottom view.

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

First Embodiment As shown in FIG. 1A, a coil device according to an embodiment of the present invention includes a case 90 and a coil assembly 10 in which a lower portion is accommodated in the case 90. As shown in FIG. 2, the coil assembly 10 includes a pair of E-type cores 12, a first bobbin 40, and a second bobbin 50.

  The pair of E-shaped cores 12 are assembled to form a magnetic path through which a magnetic flux generated by a coil described later passes. These cores 12 have a symmetrical shape, and are connected to each other so as to sandwich the second bobbin 50 and the first bobbin 40 from the vertical direction (Z-axis direction in the drawing).

  As shown in FIG. 3A, each of the cores 12 and 12 is a core having a substantially E-shaped longitudinal section (cut surface including the Y axis and the Z axis). Each of the cores 12 and 12 is composed of a ferrite core, and has a flat bases 13 and 13 extending in the Y-axis direction, and a pair of side legs 16 protruding in the Z-axis direction from both ends of the bases 13 and 13 in the Y-axis direction. , 16 and middle legs 14, 14 projecting in the Z-axis direction from intermediate positions in the Y-axis direction of the bases 13, 13.

  In the present embodiment, each core 12 includes a middle leg 14 and a pair of side legs 16 disposed at both ends in the Y-axis direction so as to be formed on each of the pair of separated core pieces 12a and 12a. The base 13 is separated by the split surfaces of the split core pieces 12a and 12a. A predetermined gap 15 is formed between the divided surfaces 12b and 12b formed along the X-axis direction, and the separated middle leg 14 is inserted into the first through hole 44a of the bobbin 40. Yes.

  The width t (see FIG. 4) of the gap 15 in the Y-axis direction is preferably 0.05 to 5 mm, and more preferably 0.1 to 3 mm. If the width t is too small, the effects of stress relaxation characteristics and heat dissipation are small, and if the width t is too large, the size tends to be unnecessarily large. Even if the gap 15 is formed, the magnetic characteristics as the E-type core hardly change. This is because there is little change in the flow of magnetic field lines as a whole.

  The predetermined gap 15 does not necessarily have to be formed on the entire surface between the divided surfaces 12b and 12b of the divided core pieces 12a and 12a, and the total area between the divided surfaces 12b and 12b is 100%. The predetermined gap 15 may be formed at a rate of 50 to 100%, preferably 80 to 100%. Further, the predetermined gap 15 does not need to be uniform over the entire surface, and may vary within a range of 0 to 5 mm, preferably within a range of 0.1 to 5 mm.

  In the drawings, the Z-axis is the height direction of the coil assembly 10, and the shorter the height of the coil assembly 10 in the Z-axis direction, the lower the height of the coil device. In addition, the Y axis and the X axis are perpendicular to each other and perpendicular to the Z axis. In this embodiment, the X axis coincides with the longitudinal direction of the bobbins 40 and 50 and is substantially parallel to the divided surfaces 12b and 12b. And the Y axis is substantially perpendicular to the divided surfaces 12b and 12b.

  However, in the present invention, the dividing surfaces 12b and 12b are not necessarily flat and may be curved surfaces. The dividing surfaces 12b and 12b are not necessarily parallel to the X axis, and may be inclined at a predetermined angle, or may be zigzag or corrugated along the X axis. In any case, the dividing surfaces 12b and 12b are formed along the X-axis direction, and the gap width t in the dividing direction between them has the relationship described above.

  As shown in FIG. 2, the first bobbin 40 includes a first bobbin substrate 42 having a substantially rectangular flat plate shape. As shown in FIGS. 3A and 3B, a first hollow cylindrical portion 44 is integrally formed at a substantially central portion of the first bobbin substrate 42 so as to extend upward in the Z-axis direction.

  As shown in FIG. 2, the first bobbin upper collar portion 48 is integrated with the upper portion of the first hollow tube portion 44 in the Z-axis direction so as to protrude radially from the first hollow tube portion 44 in the Y-axis-X axis plane. Molded. Terminal block portions 49 are integrally formed at the four corners of the first bobbin upper collar portion 48, and a pair of first terminals 70 and 72 can be detachably mounted. Of course, these terminals 70 and 72 may be integrally formed with the bobbin 40.

  These terminals 70 and 72 are made of, for example, metal terminals. As will be described later, the first terminal 70 has a lead portion 22a (see FIGS. 1 and 2) of the first wire 22 constituting the inner coil 20 serving as a secondary coil. 3B) is connected via the solder portion 24, and the lead portion 32a (see FIG. 1) of the second wire 32 constituting the outer coil 30 serving as the primary coil is connected to the second terminal 72 via the solder portion 34. Connected.

  As shown in FIGS. 2, 3, and 5, a first winding portion 45 is provided on the outer periphery of the first hollow cylinder portion 44 located between the first bobbin upper collar portion 48 and the first bobbin substrate 42. It is formed. In the first winding part 45, a plurality of partition walls 46 separating wires adjacent to each other along the winding axis (Z-axis) of the first wire 20 are arranged at predetermined intervals along the winding axis. The first hollow cylinder portion 44 is formed integrally with the upper collar portion 48 in parallel. Details of the partition 46 and the method of winding the first wire will be described later.

  The first bobbin substrate 42, the first hollow tube portion 44, the first bobbin upper collar portion 48, the terminal block portion 49, and the partition wall 46 in the first bobbin 40 are preferably integrally formed by injection molding or the like.

  A first through hole 44 a that penetrates in the Z-axis direction is formed in the first hollow cylinder portion 44 of the first bobbin substrate 42. The divided middle leg 14 in the core 12 enters the first through hole 44a from above and below in the Z-axis direction, and the front end 18 of the middle leg 14 is abutted at a substantially central portion in the Z-axis direction of the through hole 44a. It has become.

  As shown in FIG. 2, the second bobbin 50 is combined with a dividing line 51 parallel to the winding axis (Z axis) and can be divided into two, and the second winding portion 55 is formed on the outer periphery. It is. In FIG. 2, the coils 20 and 30 are not shown. The second bobbin 50 is mounted on the outer periphery of the first bobbin 40 after the first wire 22 is wound around the first winding portion of the first bobbin 40 to form the inner coil 20, and is combined at the dividing line 51. It is.

  The second bobbin 50 has a second hollow cylinder part 54 that covers the inner coil 20 from the outside, and a second bobbin lower collar part 52 and a second bobbin upper collar part 58 are provided on the outer periphery of the second hollow cylinder part 54. Are formed along the circumferential direction at predetermined intervals in the Z-axis direction. The lower collar part 52 and the upper collar part 58 are provided in parallel to the plane of the XY axis and extend in parallel to the installation surface.

Between the lower collar portion 52 and the upper collar portion 58 is a second winding portion 55, and the second winding portion 55 constitutes the outer coil 30 serving as a primary coil as shown in FIG. The second wire 32 (32 1 to 32 n ) is aligned and wound. The aligned-winding, the first layer is a winding of the second layer is wound from the wound, so that the overlap with the wires 32 n of winding end further eye winding start wire 32 1 and the second layer.

  In the present embodiment, by changing the formation position and the formation interval of the upper collar part 52 and the lower collar part 58 formed on the outer periphery of the second hollow cylinder part 54 in the second bobbin 50, as shown in FIG. Compared to the first full width L1 of the first winding part 45 in the winding axis direction, the second full width L2 of the second winding part 55 in the winding axis direction can be shortened.

  As shown in FIGS. 2 and 3A, a pair of insulating cover members 60 are attached to the outer periphery of the second winding portion 55 of the second bobbin 50 to which the outer coil 30 is attached from both sides in the Y-axis direction. . The insulating cover member 60 is made of, for example, synthetic resin, and an outer peripheral surface thereof serves as a guide surface for guiding the side legs 16 in the core 12, and the outer coil 30 is located on the inner peripheral surface thereof.

  As shown in FIG. 2, lead insertion notches 58 a are formed at two positions in the circumferential direction of the upper collar portion 58 in the second bobbin 50 at positions corresponding to the second terminals 72. As shown in FIG. 1B, the lead portion 32a that is the winding start end and the winding end end of the second wire 32 is passed through the notch 58a, and is connected to the second terminal 72 at each solder portion.

  As shown in FIG. 2, each of the two-divided second bobbins 50 including the flange portions 52 and 58 and the second hollow cylinder portion 54 is integrally formed by injection molding or the like. The cover member 60 can also be formed by injection molding or the like.

As shown in FIGS. 5 and 6, in this embodiment, compartment width w1 along the winding axis of each compartment 47 which are separated by the partition wall 46 (Z-axis), only one wire 22 (22 1 ˜22 n ) is set to a width that can enter. That is, the partition width w1 is preferably in a relationship of w1 <(2 × d1) with respect to the wire diameter d1 of the wire 22. If the section width w1 is too wide with respect to the wire diameter d1, it is difficult to wind only one section in the winding axis direction with respect to each section 47.

  The height h1 of each partition wall 46 is preferably greater than m × d1, where m is the total number of cells that are scheduled to be wound around each section 47. In that case, as shown in FIGS. 3A and 3B, the top of the partition wall 46 is brought into contact with the inner peripheral surface of the second bobbin 50, and the first winding part 45 and the second winding part 55 are substantially omitted. Positioning can be performed concentrically, and there is no need to separately provide a member for positioning the first bobbin 40 and the second bobbin 50.

  The tops of all the partition walls 46 do not have to be brought into contact with the inner peripheral surface of the second bobbin 50. The length of any one, preferably two or more partition walls separated in the winding axis direction, It may be set longer than the partition walls, and only the tops of the partition walls may be positioned so as to contact the inner peripheral surface of the second bobbin 50. Alternatively, the positioning of the first bobbin 40 and the second bobbin 50 may be performed by a member other than the partition wall 46.

  In such a case, as indicated by the dotted line in FIG. 6, the height h1 of the partition wall 46 may be smaller than m × d1. However, the length Δh (= m × d1−h1) of the protruding portion is preferably smaller than d1 / 2 so that the wire 22 does not move to the adjacent section 47. Further, it is preferable that the protruding height of the first bobbin substrate 42 and the flange portion 48 is higher than the height of the partition wall 46.

  The first wire 22 may be composed of a single wire or a stranded wire, and is preferably composed of an insulation coated conductor. The outer diameter d1 of the wire 22 is not particularly limited, but when a large current is passed, for example, φ1.0 to φ3.0 mm is preferable. The second wire 32 may be the same as the first wire 22, but may be different.

  In this embodiment, the first wire 22 is thicker than the second wire 32 because a high voltage is applied to form a secondary coil of the transformer. Is not particularly limited, and the wire diameter may be the same or may be different. The materials of the first wire 22 and the second wire 32 may be the same or different.

As shown in FIG. 5, in this embodiment, the first bobbin 40, a first wire 22 (22 1 through 22 n) is, for example, Volume 2 from the compartment 47 located at the bottom of the Z-axis direction (22 1 22 2) wound in, the next, the partition 47 located thereon, Volume 3 th wire 22 3 is wound. In the same manner, the winding end 22 n of the first wire 22 will be located in a compartment 47 located at the top of the farthest Z-axis direction from the wire 22 1 at the winding start.

On the other hand, as described above, in the second bobbin 50, the second wire 32 (32 1 to 32 n ) constituting the outer coil 30 serving as the primary coil is aligned and wound around the second winding portion 55. The The aligned-winding, the first layer is a winding of the second layer is wound from the wound, so that the overlap with the wires 32 n of winding end further eye winding start wire 32 1 and the second layer.

  As shown in FIG. 2, in the first bobbin 40, a pair of connecting grooves 46 a extending linearly in the Z-axis direction are formed on both sides in the X-axis direction of the partition walls 46 that are continuous in the circumferential direction. One of the pair of communication grooves 46a is used to move the wire 22 between adjacent sections 47 as shown in FIG. 3B. The other one of the pair of connecting grooves 46 a is used to guide the lead portion 22 a of the wire 22 that is the beginning or end of winding in the direction of the solder portion 24 of the terminal 70.

  The coil assembly 10 according to the present embodiment is manufactured by assembling the members shown in FIG. 2 and winding the wire around the first bobbin 40 and the second bobbin 50, as shown in FIGS. 1A, 3A, and 3B. As shown, the upper portion in the Z-axis direction including the terminals 70 and 72 is accommodated in the case 90 so as to be exposed. The case 90 is filled with a heat radiating resin 92. The heat-dissipating resin 92 is not particularly limited, but is preferably a resin having excellent heat dissipation, for example, having a thermal conductivity of 0.5 to 5, preferably 1 to 3 W / m · K.

  Examples of the resin excellent in heat dissipation include silicone resin, urethane resin, and epoxy resin, among which silicone resin and urethane resin are preferable. Moreover, in order to improve heat dissipation, the resin may be filled with a filler having high thermal conductivity.

  Further, the heat radiation resin 92 of the present embodiment has a Shore A hardness of 100 or less, preferably 60 or less. This is because even if the core 12 is deformed by heat, the deformation is absorbed and excessive stress is not generated in the core 12. An example of such a resin is a potting resin.

  A cooling device such as a cooling pipe or a cooling fin may be attached below the case 90 via a metal plate or the like.

  In the present embodiment, the leaf spring member 100 is used to fix the coil assembly 10 inside the case 90 filled with the heat radiation resin 92. As shown in FIG. 1A, the leaf spring member 100 is formed with slits 101 along the Y-axis direction, and the first pressing piece in which both ends in the Y-axis direction are integrally connected by connecting end portions 106. 102 and the second pressing piece 104 are formed.

  Since the slit 101 is formed, the first pressing piece 102 and the second pressing piece 104 are elongated along the Y-axis direction, and each can be bent in an independent shape. In the present embodiment, the first bent piece 102 and the second pressed piece 104 have the elastic bent portions 103 and 105 that are in contact with the upper surfaces of the respective divided core pieces 12a and 12a displaced in the Y-axis direction. It is formed.

  As shown in FIGS. 1C and 1D, fixing holes 108 are formed in the connecting end portions 106 formed at both ends in the Y-axis direction of the leaf spring member so as to be displaced in the X-axis direction. It is. Each connecting end portion 106 is formed with a positioning hole 109 that is displaced in the X-axis direction with respect to the fixing hole 108.

  As shown in FIG. 1A, a positioning pin 96 attached to a boss portion 94 formed integrally with the upper end of the case 90 in the Z-axis direction is provided in the positioning hole 109 formed in each connecting end portion 106. It is designed to be inserted. As shown in FIG. 1C, in the present embodiment, it is preferable that one of the positioning holes 109 is formed larger than the inner diameter of the other positioning hole 109. This is because the positioning pin 96 is surely inserted into the positioning hole 109 even if a manufacturing error occurs.

  A fixing bolt 110 is attached to the fixing hole 108, and each connecting end portion 106 can be detachably fixed to the boss portion 94 of the case 90. The elastic bent portions 103 and 105 are bent in a convex shape downward in the Z-axis direction so as to be in pressure contact with the upper surface of each divided core piece 12a. It is designed to press downward in the axial direction.

  The leaf spring member 100 of the present embodiment can be formed by forming a slit 101 in a cut-out metal leaf spring and bending it. Or it is good also as a resin-made leaf | plate spring member 100 by integrally forming with a synthetic resin by injection molding etc. FIG.

  Below, an example of the manufacturing method of a coil apparatus is demonstrated using FIG. In manufacturing the coil device 10, first, the first bobbin 40 to which the first terminal 70 and the second terminal 72 are attached is prepared. Although the material of the 1st bobbin 40 is not specifically limited, The 1st bobbin 40 is formed with insulating materials, such as resin.

  Next, the first wire 22 is wound around the outer periphery of the first hollow cylinder portion 44 of the first bobbin 40 to form the inner coil 20. Although it does not specifically limit as the 1st wire 22 used for formation of the inner coil 20, A litz wire etc. are used suitably. In addition, the lead portion 22a, which is the end portion of the first wire 22 when forming the inner coil 20, is entangled with a part of the first terminal 70 and soldered and connected.

  Next, the 2nd bobbin 50 is attached with respect to the 1st bobbin 40 in which the inner side coil 20 was formed. A second wire 32 constituting the outer coil 30 is wound around the outer periphery of the second hollow cylinder portion 54 in the second bobbin 50.

  After that, the covers 60 are attached to both sides of the second bobbin 50 in the Y-axis direction, and then the cores 12 each composed of the divided core pieces 12a and 12a are attached from the vertical direction in the Z-axis direction. That is, the front ends 18 of the divided middle legs 14 and 14 of the core 12 and the front ends 19 of the side legs 16 and 16 are abutted. A gap may be provided between the tips 18 of the middle legs 14 and 14.

  Examples of the material of each core 12 include soft magnetic materials such as metal and ferrite, but are not particularly limited. The core 12 is fixed to the second bobbin 50 and the first bobbin 40 by being bonded using an adhesive or by winding the outer periphery with a tape-shaped member 80. However, the divided cores 12a and 12a are fixed to the second bobbin 50 and the first bobbin 40 so that the gap width t between the divided surfaces 12b and 12b shown in FIG. 4 is maintained within a predetermined range. The

  In this embodiment, a varnish impregnation process may be performed with respect to the coil assembly 10 after a series of assembly processes. The coil assembly 10 according to the present embodiment can be manufactured through the processes as described above.

  Thereafter, as shown in FIGS. 1A, 3A, and 3B, the coil assembly 10 includes a case 90 filled with a heat-dissipating resin 92 so that an upper portion in the Z-axis direction including the terminals 70 and 72 is exposed. Housed inside. The resin 92 may be filled before or after the coil assembly 10 is accommodated in the case 90. In any case, the resin 92 is also filled in at least a part of the gap 15 between the divided surfaces 12b, and preferably, more than the tips 18 of the middle legs 14, 14 and the tips 19 of the side legs 16, 16 The gap 15 is filled with the resin 92 up to the upper position in the Z-axis direction.

  After mounting the coil assembly 10 inside the case 90, the connecting end portion 106 of the leaf spring member 100 is fixed to the boss portion 94 of the case 90 using a fixing bolt 110 or the like.

  In particular, at the position between the tips 18 of the middle legs 14, 14, heat is easily trapped. However, in this embodiment, there is a gap 15 in that portion, and the heat dissipation resin exists, so Heat is transferred downward in the Z-axis direction and is easily radiated through the case 90. The case 90 may be made of a metal having excellent heat dissipation or the like, or may be made of resin and cooled by a cooling means that is mounted below the Z-axis direction.

  In the coil assembly 10 of the present embodiment, the middle leg 14 and the base 13 are divided into the split core pieces 12a and 12a so that the pair of side legs 16 are formed on each of the separated pair of split core pieces 12a and 12a. It is separated by the dividing surfaces 12b and 12b of 12a. In addition, a predetermined gap 15 is formed between the divided surfaces 12 a and 12 a, and the separated middle leg 14 is inserted into the through hole 44 a of the bobbin 40.

  In the present embodiment, the local stress generated at the intersection between the middle leg 14 and the base 13 is reduced to about 1/2, compared to the case where the conventional E-type core is used. Can be halved to about 2 or less. Therefore, in the coil assembly 10 according to the present embodiment, it is possible to effectively suppress the occurrence of cracks and the like even when thermal stress occurs in the cores 12 and 12.

  In particular, as shown in FIG. 4, when a pair of E-shaped cores 12 are combined, the length Ly in the Y-axis direction is 50 mm or more, the length Lx in the X-axis direction is 20 mm or more, and the length in the Z-axis direction. The use of a large core having an Lz of 10 mm or more is being studied. Conventionally, such a large core has been difficult to use because the thermal stress is particularly large and cracks are generated. In the present embodiment, by providing the gap 15, Since the local stress generated at the intersection with 13 can be halved to about ½ or less of the conventional value, it can be used.

  Further, the middle leg 14 and the base 13 in the E-type core are separated by the divided surfaces 12b and 12b of the divided core pieces 12a and 12a, and a predetermined gap 15 is formed between the divided surfaces 12a and 12a. Therefore, heat dissipation is also improved. Further, in the present embodiment, the E-type cores 12 and 12 are configured by combining a pair of split core pieces 12a and 12a each having a simple shape, and the cores 12 and 12 can be easily manufactured, resulting in a manufacturing cost. Can also be reduced. Each divided core piece 12a has a U-shaped cross section and is easy to mold. In addition, since the divided E-type cores 12 and 12 according to the present embodiment have the same magnetic field lines as the E-type core as a whole, the magnetic characteristics of the cores 12 and 12 are generally E-type cores. Is equivalent to

  In the present embodiment, at least the lower part of the coil assembly 10 along the Z-axis direction is accommodated in the case 90 and is in contact with the heat radiation resin 92. By contacting the heat-dissipating resin 92, heat dissipation is further improved.

  Moreover, in the present embodiment, the heat radiation resin 32 is filled between the divided surfaces 12b and 12b located at the protruding tip 18 of the middle leg 14. In particular, since heat is easily trapped at the protruding tip 18 portion of the middle leg 14, the heat dissipation resin 92 is interposed at that portion, so that the portion is effectively radiated.

  The coil assembly 10 of the present embodiment has a pair of E-type cores 12 and 12, and each of the middle legs 14 into which the pair of E-type cores 12 and 12 are divided is inserted into the through-hole 44 a of the bobbin 40. , Inserted from opposite sides in the Z-axis direction. Moreover, in the middle of the through hole 44a in the Z-axis direction, the projecting tips 18 of the divided middle legs 14 face each other, and outside the bobbin 50, the separated side legs 16 of the pair of E-type cores 12 are They are faced with each other. Thus, even when a pair of E-type cores 12 and 12 are used, the present embodiment is excellent in stress relaxation characteristics and heat dissipation, and contributes to a reduction in manufacturing cost.

  In addition, the coil device of the present embodiment is a vertical type in which the Z-axis direction (the direction in which the magnetic flux flows) of the middle leg 14 is perpendicular to the installation surface (the lower surface of the case 90). In the vertical coil device, the bases 13 and 13 of the core 12 are arranged in the vertical direction of the Z-axis of the coils 20 and 30, and the bases 13 and 13 have an effect of suppressing leakage magnetic flux in the vertical direction. Therefore, the coil device can effectively suppress the leakage magnetic flux in the vertical direction of the coil device as compared with the horizontal type in which the vertical direction of the coil is hardly shielded by the core.

  The tape-shaped member 80 is mainly used for fixing the pair of cores 12. The tape-shaped member 80 is made of a material such as polyester, polyimide, or paper. In the case where the tape-shaped member 80 is also provided with heat dissipation properties, the tape-shaped member 80 is preferably made of a material that is more excellent in thermal conductivity than the core 12, and specifically, for example, aluminum, copper, or the like. It is comprised with the material excellent in thermal conductivity, such as a metal or these alloys. Of course, as the tape-shaped member 80, the tape-shaped members made of the various materials described above may be used in combination.

  In the present embodiment, the bases 13 and 13 and the side legs 16 and 16 of the core 12 cover the combination of the first bobbin 40 and the second bobbin 50 from the outside. With such a structure, leakage magnetic flux can be prevented. The width along the X-axis direction of the bases 12 and 12 and the side legs 16 and 16 may be the same or different with respect to the length along the X-axis direction of the middle legs 14 and 14 of the core 12. By making them substantially the same, the leakage characteristics can be easily adjusted.

  In the coil assembly 10 according to the present embodiment, as shown in FIG. 5, when the first wire 22 is wound more than one layer around the first winding portion 45 in which the partition wall 46 is formed, in each section 47. After winding more than one layer, in the adjacent section 47, more than one layer is wound. Then, as shown in FIG. 2, the wire 22 is sequentially moved to the adjacent section 47 through the connecting groove 46a and wound further. Therefore, as shown in FIG. 5, the winding order of the overlapping first wires 22 in each section 47 is close, the voltage difference between them is small, and the wires adjacent in the winding axis (Z-axis) direction are insulated from each other by the partition wall 46. Thus, the withstand voltage characteristics are improved and the high frequency characteristics are improved.

Moreover, in each section 47, since the wires 22 are wound so that only the single wires 22 1 to 22 n exist along the winding axis direction, variations in the number of turns of the wires 22 per layer are prevented. This contributes to the stabilization of the leakage characteristics. That is, it becomes easy to strictly control the coupling coefficient K between the outer coil 30 constituting the primary coil and the inner coil 20 constituting the secondary coil, and the coil device of this embodiment is also suitably used as a leakage transformer. be able to.

  In addition, the coil device of the present embodiment can be used as a vertical type coil device in which the coil winding axis is disposed perpendicular to the mounting substrate surface (the lower surface of the case 90). It is easy to cool the core 12 inserted into the hollow portion.

  Moreover, in the present embodiment, the first wire 20 arranged on the inner peripheral side constitutes a secondary coil (inner coil 20) on which a higher voltage acts than the primary coil of the transformer. For this reason, insulation becomes easy by arrange | positioning the secondary coil (inner coil 20) to which a high voltage acts inside the primary coil (outer coil 30) to which a relatively low voltage acts. Further, in the second winding portion 55, the second wire 32 is normally aligned and wound. However, since the second wire 32 is the outer coil 30 serving as a primary coil to which a relatively low voltage is applied, there is a problem. There is no.

  Furthermore, in this embodiment, since the 2nd bobbin 50 can be divided | segmented by the dividing line 51 parallel to a winding axis | shaft, as shown in FIG. 2, the 2nd bobbin 50 is easily put on the outer periphery of the 1st bobbin 40. Can be arranged.

  In the present embodiment, as shown in FIG. 5, the first full width L1 in the winding axis direction of the first winding part 45 is different from the second full width L2 in the winding axis direction of the second winding part 55. Therefore, the leakage characteristics can be adjusted easily and accurately.

  Furthermore, in the present invention, the communication grooves 46a formed in the partition walls 46 are not necessarily arranged on a straight line along the winding axis direction, but preferably communicate in a straight line as shown in FIG. It is arranged as follows. In particular, if the connecting groove 46a serving as the return path of the lead portion 22a is linear in the Z-axis direction, the end portion of the lead portion 22a of the wire 22 can be connected to the terminal 70 at the shortest distance. Further, by forming the connecting groove 46a for moving the wire 22 from each section 47 to the adjacent section 47 in each partition wall 46 at the same position in the circumferential direction, the winding process of the wire 22 is facilitated.

  In particular, in this embodiment, the slit 101 is formed in the single leaf | plate spring member 100, and the 1st press piece 102 and the 2nd press piece 104 are formed. In addition, the first pressing piece 102 and the second pressing piece 104 are formed with elastic bent portions 103 and 105 that are in contact with the respective divided core pieces 12a and 12a and are displaced in the Y-axis direction. For this reason, in this embodiment, even if each divided | segmented division | segmentation core piece 12a has a size variation, the elastic bending parts 103 and 105 of each press piece 102 and 104 elastically press. Therefore, each divided core piece 12a, 12b can be reliably held with respect to the case 90. In addition, the elastic bent portions 103 and 105 of the pressing pieces 102 and 104 are in contact with the divided core pieces 12a and 12a, respectively, and the other parts of the spring member 100 are not in contact with the core pieces 12a and 12a. Is also excellent.

  Furthermore, since the slit 101 is formed in the single spring member 100 and the first pressing piece 102 and the second pressing piece 104 are formed, the first pressing piece 102 is formed at both ends of the spring member 100. And the second pressing piece 104 are continuous by the connecting end portion 106. Therefore, by fixing the connecting end portions 106 formed at both ends of the spring member 100 to the case 90, the spring member 100 can be attached, and the attaching operation is easy.

Second Embodiment FIG. 7 and FIG. 8 show a coil assembly 10a according to a second embodiment, which has a second bobbin 50a structure as compared with the coil assembly according to the first embodiment shown in FIGS. Are different, and the others are the same, and different parts will be described below.

In the coil assembly 10a, one or more partition walls 56 are formed in the middle of the winding axis direction of the second bobbin, and the second winding portion 55 is divided into two or more sections along the winding axis direction. It is divided into 57. In each section 57, second wires 32 1 to 32 k and 32 k + 1 to 32 n ) are wound in an aligned manner. The partition wall 56 is formed with one or more communication grooves 56a along the circumferential direction. The communication groove 56a has the same function as the communication groove 46a.

  In the coil assembly 10a of this embodiment, the outer coil 30 constituting the primary coil can be divided and arranged. In addition, the primary coil divided | segmented and arrange | positioned for every division 57 may be a separate independent coil comprised with a different wire, respectively.

Third Embodiment In the first embodiment, as shown in FIG. 5, the center position of the second winding portion 55 in the winding axis direction is aligned with the center of the first winding portion 45 in the winding axis direction. However, not only that, but may be configured as shown in FIG. 9A. In the coil assembly 10b according to this embodiment, the lower end of the second winding part 55 may be aligned with the lower end position of the first winding part 45 in the winding axis direction.

By doing in this way, it can be expected that the heat radiation effect from the coils 20 and 30 is enhanced. This is because by providing the heat radiating portion at the lower end portion of the coil assembly 10b, not only the coil 20 but also the heat transfer characteristics from the coil 30 are improved. In the embodiment shown in FIG. 9A, the first wire 22 (22 1 to 22 n ) is started to be wound from the upper end of the winding shaft. Other configurations and operational effects are the same as those of the coil assembly according to the first embodiment.

  Further, as in the coil assembly 10c shown in FIG. 9B, the leakage characteristics can also be adjusted by making the first winding portion 45 and the second winding portion 55 have the same overall width and different numbers of winding layers. May be. The coil assembly 10c shown in FIG. 9B differs from the coil assembly according to the first embodiment shown in FIGS. 1 to 6 in the length of the second bobbin 50c in the winding axis direction, and the second wire 32 is the same. Only the number of winding layers is different, and the others are the same.

Further, in the coil assembly 10d shown in FIG. 9C, the first bobbin 40a is formed in the first winding portion 45 with the first wire 22 (22 1 to 22 n ) being aligned winding without forming the partition wall 46. The inner coil 20a to be used may be a primary coil in a transformer. In that case, a partition wall 56d similar to the partition wall 46 in the first embodiment is formed in the second winding portion 55 of the second bobbin 50d, and the second wire 32 (32 1 to 32 n) constituting the outer coil 30d. The same winding method as that of the first wire 22 in the first embodiment is adopted. In this embodiment, the outer coil 30d constitutes a secondary coil of the transformer. Other configurations and operational effects are the same as those of the first embodiment.

  In the above-described embodiment, the outer coil 30 and the inner coil 20 do not have to be positioned concentrically, and may be shifted in order to adjust the leakage characteristics.

Fourth Embodiment As shown in FIG. 10, the coil assembly 10 e of this embodiment has an E-type core 12 </ b> A and an I-type core 17. The E-shaped core 12A is a core having a substantially E-shaped longitudinal section (cut surface including the Y-axis and the Z-axis). The core 12A includes a flat base 13a extending in the Y-axis direction, a pair of side legs 16a and 16a protruding in the Z-axis direction from both ends of the base 13a in the Y-axis direction, and an intermediate position of the base 13a in the Y-axis direction. And a middle leg 14a protruding in the Z-axis direction.

  In the present embodiment, the core 12A has a middle leg 14a such that a pair of side legs 16a and 16a disposed at both ends in the Y-axis direction are formed on the pair of separated core pieces 12a1 and 12a1, respectively. The base 13a is separated by the divided surfaces 12b and 12b of the divided core pieces 12a1 and 12a1. A predetermined gap 15 is formed between the divided surfaces 12 b and 12 b, and the separated middle leg 14 is inserted into the first through hole 44 a of the bobbin 40.

  The I-type core 17 that extends linearly in the Y-axis direction is composed of divided core pieces 17a and 17a that are divided into two by divided surfaces 17b and 17b formed substantially at the center in the Y-axis direction. The dividing surfaces 17b and 17b are formed at substantially the same position in the Y-axis direction as the dividing surfaces 12b and 12b, and have the same gap width as that in the first embodiment.

  The I-type core 17 is disposed substantially parallel to the base 13a at the end of the bobbin 40 located on the opposite side of the base 13a along the Z-axis direction with respect to the base 13a in the E-type core 12A. The protruding tip 18a of the middle leg 14a inserted into the through hole 44a of the bobbin 40 extends to the same level as the lower end surface of the through hole 44a in the Z-axis direction. It is arranged so as to face each other. Further, the protruding tips 19a of the side legs 16a formed at both ends of the E-type core 12A are butted against both ends of the I-type core 17 in the Y-axis direction.

  As described above, even when the E-type core 12A and the I-type core 17 are used, the present embodiment is excellent in stress relaxation characteristics and heat dissipation, and contributes to a reduction in manufacturing cost. As shown in FIG. 10, the I-type core 17 may be separated by a predetermined gap in the middle part in the Y-axis direction. However, the I-type core 17 extends in the Y-axis direction without being separated. It may be.

  The I-type core is preferably disposed below the Z-axis direction in the coil assembly 10e. By arranging in this way, the protruding tip 18a of the middle leg 14a in the E-type core 12A is arranged on the lower side of the case 90 in the Z-axis direction. Therefore, the portion where the temperature is likely to rise is disposed below the case 90, and the gap 15 is reliably filled with the heat radiation resin, further improving the heat dissipation. This is because the cooling means is mounted below the case 90. Other configurations and operational effects are the same as those of the coil assembly according to the first embodiment.

Fifth Embodiment As shown in FIGS. 11 and 12, in the coil assembly 10f of this embodiment, the first hollow cylinder portion 44 constituting the first through hole 44a of the bobbin 40 in which the through hole 44a is formed. Positioning convex portions 41 are integrally formed on the inner peripheral wall at four positions at both ends in the Z-axis direction at both ends in the Y-axis direction. The thickness of the positioning convex portion 41 in the Y-axis direction is the same as the gap width t shown in FIG. 4, and the convex portion 41 is for ensuring the gap width t.

  By inserting the middle leg 14 of the split core piece 12a into the through-hole 44a from above and below in the Z-axis direction so as to sandwich the convex portion 41 from the Y-axis direction, the split surfaces 12b of the split core piece 12a are mutually convex. The state of being separated by a predetermined gap width t corresponding to the thickness of 41 in the Y-axis direction is maintained. A plurality of convex portions 41 may be formed intermittently in the Z-axis direction on the inner peripheral wall of the first hollow cylindrical portion 44 constituting the first through hole 44a of the bobbin 40, or continuously in the Z-axis direction. It may be formed. Other configurations and operational effects are the same as those of the coil device according to the first embodiment.

Sixth Embodiment As shown in FIG. 13, FIG. 14A and FIG. 14B, in the coil assembly 10g of this embodiment, the heat radiating sheet 15a is sandwiched in contact with the gap 15 between the split core pieces 12a, 12a. The middle leg 14 separated by 15 is inserted into the first through hole 44 a of the bobbin 40.

  The heat dissipation sheet 15a is, for example, a metal plate such as aluminum or copper having excellent heat dissipation, a resin plate such as PPS or PBT having good thermal conductivity, or another plate such as a ceramic plate or silicon sheet having excellent heat conductivity. Consists of. The material of the heat radiating sheet 15a is not particularly limited as long as the material has a thermal conductivity higher than that of the material constituting the split core 12a.

  In the illustrated example, as shown in FIG. 13, one heat dissipation sheet 15 is provided for each E-type core 12 and is connected in the Z-axis direction at the same position as the protruding tip 18 of the middle leg 14. However, the present invention is not limited to the illustrated example, and may be a single heat dissipation sheet continuous along the through hole 44a. The heat radiating sheet 15a may be adhered to the divided surfaces 12b and 12b of the divided core 12a with an adhesive, or may simply be brought into contact with each other.

  In this embodiment, since the heat radiating sheet 15a is interposed in the gap 15 of the split core piece 12a, the heat dissipation is improved. Other configurations and operational effects are the same as those of the coil device according to the first embodiment.

Seventh Embodiment The coil device of the present embodiment has the same configuration as that of the above-described embodiment except that the heat dissipation sheet 15A shown in FIG. 15A is used. The heat radiating sheet 15A has a split surface contact portion 15a1 parallel to the Z-axis direction, and a sheet-like upper heat radiating portion 15b connected or integrally formed on the upper portion of the split surface contact portion 15a1 in the same manner as the split surface contact portion 15a1. Yes, as a whole, the cross section has a substantially T-shape.

  The split surface contact portion 15a1 is the same as the split sheet 15a in the above-described embodiment, and is sandwiched between the split surfaces 12b and 12b. The upper heat radiating portion 15b is, for example, the upper split core in the Z-axis direction shown in FIG. The upper surface of the base part 13 of 12a, 12a is covered, contacts the upper surface of the base part 13, and absorbs heat generated in the upper part of the coil device 10. Therefore, the heat generated in the upper part of the coil device can be easily released to the lower side of the coil device through the heat radiation sheet 15A and the heat radiation resin 92. Of course, heat is also radiated from the upper heat radiating portion 15b itself.

  Moreover, in this embodiment, as shown to FIG. 15B, it is good also as a substantially T-shaped heat radiating sheet 15A as shown to FIG. 15A as a whole by combining a pair of heat radiating sheet 15A1 of L-shaped cross section. Each heat radiating sheet 15A1 is formed by connecting or integrally forming a divided surface contact portion 15a1 parallel to the Z-axis direction and a sheet-like upper heat radiating portion 15b1 extending in one direction in the Y-axis direction above the divided surface contact portion 15a1. is there. The pair of heat radiating sheets 15A1 have a cross-sectional shape that is line-symmetric with respect to the Z axis.

  The split surface contact portion 15a1 is the same as the split sheet 15 in the above-described embodiment, and is sandwiched between the split surfaces 12b and 12b, and the upper heat radiating portion 15b1 is, for example, the upper split core in the Z-axis direction shown in FIG. The upper surface of the base part 13 of 12a, 12a is covered, contacts the upper surface of the base part 13, and absorbs heat generated in the upper part of the coil device 10. Therefore, the heat generated in the upper part of the coil device can easily escape to the lower side of the coil device through the heat radiation sheet 15A1 and the heat radiation resin 92. Of course, heat is also radiated from the upper heat radiating portion 15b1 itself.

  The heat radiating sheets 15A and 15A1 are provided with a lower heat radiating portion (not shown) together with the upper heat radiating portions 15b and 15b1, or separately from the upper heat radiating portion, for example, on the lower side in the Z-axis direction shown in FIG. The lower surface of the base portion 13 of the split cores 12 a and 12 a may be covered and contacted with the lower surface of the base portion 13 to absorb heat generated at the lower portion of the coil device 10. Since the lower part of the coil device 10 (the lower surface of the base part 13 of the split cores 12a and 12a) is in contact with the heat-dissipating resin, heat is radiated satisfactorily.

  In this embodiment, you may comprise the leaf | plate spring member 100 of embodiment mentioned above so that the upper thermal radiation part 15b, 15b1 in thermal radiation sheet | seat 15A, 15A1 may be contacted. Other configurations and operational effects are the same as those of the coil device according to the above-described embodiment.

Eighth Embodiment As shown in FIGS. 16 and 17, in the coil device of the present embodiment, the configuration of the leaf spring member 100a is only different from the above-described embodiment. In the leaf spring member 100a of the present embodiment, rising pieces 107 having a height in the Z-axis direction are formed integrally with each connecting end portion 106 formed at both ends of the slit 101 in the Y-axis direction. .

  Since the rising piece 107 is formed, for example, it is possible to cope with the case where the boss portion 94 of the case 90 shown in FIG. 1A is formed below in the Z-axis direction. Other configurations and operational effects are the same as those of the coil device according to the above-described embodiment.

  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 coil device according to the present invention, the case 90 need not necessarily be filled with the heat radiation resin 92. In the present invention, the case is not particularly limited as long as it holds the coil assembly, and the coil assembly does not necessarily have to be accommodated in the case. Furthermore, in the present invention, the shape of the split core piece is not limited to the above-described embodiment, and may be various split core pieces.

DESCRIPTION OF SYMBOLS 10, 10a-10g ... Coil assembly 12, 12A ... E type | mold core 12a ... Divided core piece 12b ... Divided surface 13 ... Base 14 ... Middle leg 15 ... Gap 15a ... Radiation sheet 16 ... Side leg 17 ... I type core 17a ... split core piece 17b ... dividing plane 18,19,18a, 19a ... front end 20, 20a ... inner coil 22 (22 1 through 22 n) ... first wire 22a ... leads 24 ... solder portion 30 ... outer coil 32 (32 1 ~32 k, 32 k + 1 ~32 n) ... second wire 32a ... lead 34 ... solder portion 40 ... first bobbin 42 ... first bobbin plate 44 ... first hollow tubular portion 44a ... first through hole 45 ... first Winding portion 46 ... partition wall 46a ... communication groove 47 ... section 48 ... first bobbin upper collar portion 50 ... second bobbin 52 ... second bobbin lower collar portion 54 ... second hollow cylinder portion 55 ... second winding portion 56, 56d ... partition wall 56a ... communication groove 57d ... section 58 ... second bobbin upper collar 60 ... cover 70 ... first terminal 72 ... second terminal 80 ... tape-like member 90 ... case 92 ... heat radiation resin 94 ... boss part 96 ... Positioning pins 100, 100a ... leaf spring member 101 ... slit 102 ... first pressing piece 103 ... first bent portion 104 ... second pressing piece 105 ... second bent portion 106 ... connecting end 107 ... rising piece 108 ... fixing hole 109 ... Positioning hole 110 ... Fixing bolt

Claims (5)

  1. A coil assembly having a core, a bobbin, and a coil attached to an outer periphery of the bobbin;
    A case for holding the coil assembly;
    A coil device comprising:
    The core has divided core pieces separated along the first axis direction among the first axis, the second axis, and the third axis perpendicular to each other,
    A spring member is attached to the case,
    In the spring member, a slit is formed along the second axial direction, and a first pressing piece and a second pressing piece are formed,
    In the first pressing piece and the second pressing piece, elastic bent portions that press the respective divided core pieces downward along the third axis with respect to the case are displaced in the second axial direction. Coil device characterized by being formed.
  2.   2. The coil device according to claim 1, wherein at least a lower part of the coil assembly along the third axial direction is in contact with a heat radiation resin accommodated in the case.
  3.   The coil device according to claim 1 or 2, wherein a predetermined gap is formed between the split surfaces of the split core pieces.
  4.   The coil device according to claim 3, wherein a heat radiation sheet is interposed in at least a part of the predetermined gap.
  5.   The coil device according to claim 1, wherein the core includes an E-type core, and the E-type core is configured by the divided core pieces.
JP2013030363A 2013-02-19 2013-02-19 Coil device Active JP6094251B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013030363A JP6094251B2 (en) 2013-02-19 2013-02-19 Coil device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013030363A JP6094251B2 (en) 2013-02-19 2013-02-19 Coil device
KR20140016764A KR101490076B1 (en) 2013-02-19 2014-02-13 Coil Device
CN201410055868.1A CN103996501B (en) 2013-02-19 2014-02-19 Coil device

Publications (2)

Publication Number Publication Date
JP2014160737A true JP2014160737A (en) 2014-09-04
JP6094251B2 JP6094251B2 (en) 2017-03-15

Family

ID=51310636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013030363A Active JP6094251B2 (en) 2013-02-19 2013-02-19 Coil device

Country Status (3)

Country Link
JP (1) JP6094251B2 (en)
KR (1) KR101490076B1 (en)
CN (1) CN103996501B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016127109A (en) * 2014-12-26 2016-07-11 ダイキン工業株式会社 Reactor cooling structure
JP2016149423A (en) * 2015-02-12 2016-08-18 日本信号株式会社 Impedance bond
JP2018018902A (en) * 2016-07-26 2018-02-01 株式会社オートネットワーク技術研究所 Reactor
WO2019097574A1 (en) * 2017-11-14 2019-05-23 三菱電機株式会社 Electric power converter
WO2019176082A1 (en) * 2018-03-16 2019-09-19 新電元工業株式会社 Magnetic component

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6528614B2 (en) * 2015-09-02 2019-06-12 富士電機株式会社 Mounting structure of winding parts and power converter provided with this mounting structure
JP6610284B2 (en) * 2016-01-22 2019-11-27 Tdk株式会社 Coil device
CN106252033A (en) * 2016-10-31 2016-12-21 成都致研新能电子科技有限公司 A kind of high-power high-frequency transformer with radiating structure

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0390407U (en) * 1989-12-28 1991-09-13
JPH07297036A (en) * 1994-04-20 1995-11-10 Tokin Corp Noise absorber
US20030231094A1 (en) * 2002-06-12 2003-12-18 Netec Ag Electromagnetic inductor and transformer device and method of making the same
JP2005340458A (en) * 2004-05-26 2005-12-08 Tdk Corp Fixing tool for inductance component and power unit using the same
JP2010045110A (en) * 2008-08-11 2010-02-25 Sumitomo Electric Ind Ltd Reactor assembly
JP2010080513A (en) * 2008-09-24 2010-04-08 Tamura Seisakusho Co Ltd Inductor
JP2011182502A (en) * 2010-02-26 2011-09-15 Keihin Corp Switching power supply
JP2012023149A (en) * 2010-07-13 2012-02-02 Nichicon Corp Holding structure of electronic component
JP2012204814A (en) * 2011-03-28 2012-10-22 Tdk Corp Core, transformer, choke coil and switching power supply device
JP2013034270A (en) * 2011-08-01 2013-02-14 Denso Corp Power supply device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08138951A (en) * 1994-11-10 1996-05-31 Tokin Corp Transformer choke coil
JP2000173827A (en) * 1998-12-04 2000-06-23 Tdk Corp Ferrite core housing case, noise eliminating component, wire harness and electronic component
JP3585752B2 (en) * 1998-12-15 2004-11-04 Tdk株式会社 Transformer core fixing structure and transformer
JP2004140006A (en) * 2002-10-15 2004-05-13 Minebea Co Ltd Common mode choke coil and line filter
JP2007227640A (en) * 2006-02-23 2007-09-06 Toyota Motor Corp Cooling structure of reactor, and electrical apparatus unit
CN101140823B (en) * 2006-09-05 2010-08-18 Delta Electronics Inc Transformer device structure and manufacture method
JP5213652B2 (en) 2008-11-14 2013-06-19 株式会社タムラ製作所 Inductor
JP5152701B2 (en) 2009-05-18 2013-02-27 住友電気工業株式会社 Reactor, coil molding, and converter
JP5388061B2 (en) 2009-07-28 2014-01-15 株式会社タムラ製作所 Inductor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0390407U (en) * 1989-12-28 1991-09-13
JPH07297036A (en) * 1994-04-20 1995-11-10 Tokin Corp Noise absorber
US20030231094A1 (en) * 2002-06-12 2003-12-18 Netec Ag Electromagnetic inductor and transformer device and method of making the same
JP2005340458A (en) * 2004-05-26 2005-12-08 Tdk Corp Fixing tool for inductance component and power unit using the same
JP2010045110A (en) * 2008-08-11 2010-02-25 Sumitomo Electric Ind Ltd Reactor assembly
JP2010080513A (en) * 2008-09-24 2010-04-08 Tamura Seisakusho Co Ltd Inductor
JP2011182502A (en) * 2010-02-26 2011-09-15 Keihin Corp Switching power supply
JP2012023149A (en) * 2010-07-13 2012-02-02 Nichicon Corp Holding structure of electronic component
JP2012204814A (en) * 2011-03-28 2012-10-22 Tdk Corp Core, transformer, choke coil and switching power supply device
JP2013034270A (en) * 2011-08-01 2013-02-14 Denso Corp Power supply device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016127109A (en) * 2014-12-26 2016-07-11 ダイキン工業株式会社 Reactor cooling structure
JP2016149423A (en) * 2015-02-12 2016-08-18 日本信号株式会社 Impedance bond
JP2018018902A (en) * 2016-07-26 2018-02-01 株式会社オートネットワーク技術研究所 Reactor
WO2019097574A1 (en) * 2017-11-14 2019-05-23 三菱電機株式会社 Electric power converter
WO2019176082A1 (en) * 2018-03-16 2019-09-19 新電元工業株式会社 Magnetic component

Also Published As

Publication number Publication date
CN103996501A (en) 2014-08-20
KR20140103853A (en) 2014-08-27
KR101490076B1 (en) 2015-02-04
CN103996501B (en) 2016-10-19
JP6094251B2 (en) 2017-03-15

Similar Documents

Publication Publication Date Title
TWI467607B (en) Electromagnetic component
JP5699133B2 (en) Surface mount magnetic component and manufacturing method thereof
JP4851062B2 (en) Inductance element manufacturing method
JP3624840B2 (en) inductor
KR20120052339A (en) High current magnetic component and methods of manufacture
US20190385784A1 (en) Coil and method for forming a coil
JP5985825B2 (en) High current amorphous powder core inductor
JPWO2006070544A1 (en) Magnetic element
JP2008112753A (en) Lateral low-profile coil part, and soldering method of its winding terminal
US6342778B1 (en) Low profile, surface mount magnetic devices
DE10148133A1 (en) Flat transformer with inserted secondary windings
KR20120003008A (en) Surface mount magnetic component assembly
US7679482B2 (en) Inductor
JP4026128B2 (en) Bobbin for coil
US8242871B2 (en) Transformer
JP4472589B2 (en) Magnetic element
JP4532167B2 (en) Chip coil and substrate with chip coil mounted
JP5388141B2 (en) Transformer and flat panel display device including the same
JP4306666B2 (en) Surface mount type inductor
US7443277B2 (en) Coil component
JP2005340812A (en) Coil structure and method of manufacturing the same
JP5328797B2 (en) Sheet transformer for DC / DC converter
US8643457B2 (en) Coil and method of forming the coil
JP2005340680A (en) Transformer
CN102376439A (en) Transformer and display device using the same

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150928

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20160824

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160927

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20161125

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20170117

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20170130

R150 Certificate of patent or registration of utility model

Ref document number: 6094251

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150