JP5839184B2 - Vertical transformer - Google Patents

Description

  The present invention relates to a vertical transformer used for electrical products and the like.

  Transformers are used for various applications in various electrical products. For example, in driving a backlight of a liquid crystal display, an inverter resonant transformer is used to obtain a high voltage.

  Here, the transformer includes a horizontal transformer in which the leg of the core through which the coil is inserted extends substantially parallel to the installation surface of the transformer, and the core leg through which the coil is inserted is substantially perpendicular to the installation surface of the transformer (installation surface) Vertical transformer) extending in the normal direction). In the vertical transformer according to the prior art, for example, two parallel walls that are continuous from one end side to the other end side are formed on the upper collar portion of the bobbin, and the magnetic material is interposed between the two continuous walls. It had the structure which installs a connection part (refer FIG. 7 etc. of patent document 1).

JP-A-61-81612

  The vertical transformer according to the prior art has an advantage that the core can be easily positioned with respect to the bobbin by installing a connecting portion of a magnetic material between two continuous walls. On the other hand, there has been a problem that a sound is generated when the transformer is driven. Electronic parts used in video / audio equipment and the like are required to have a high level of silence, and therefore, in transformers used in such products, it is particularly necessary to suppress noise.

  The present invention has been made in view of such problems, and an object thereof is to provide a vertical transformer that can suppress noise and improve the quietness.

The vertical transformer according to the present invention is
A middle leg extending substantially parallel to a first direction that is perpendicular to the installation surface and passing through the first coil and the second coil; and a side leg extending substantially parallel to the first direction; , One end of the middle leg and one of the side legs extending in a second direction which is a direction parallel to the installation surface and connecting the middle leg and the side leg. A first connecting portion that connects the end of the second leg, and a second connecting portion that extends substantially parallel to the second direction and connects the other end of the middle leg and the other end of the side leg. A core having,
The first hollow cylinder part around which at least one of the first coil and the second coil is wound is connected to the end part of the first hollow cylinder part on the side close to the first connection part. A first core mounting surface extending substantially parallel to the installation surface and facing the first connection portion; and the first connection portion in a direction parallel to the installation surface and intersecting the second direction. A first bobbin having a first inclined surface disposed on both sides with the first inclined surface rising from the first core mounting surface in the first direction;
The first connecting portion side surface which is a surface extending in a direction intersecting the first core mounting surface in the first connecting portion is connected to the first inclined surface of the first bobbin, and the adhesive is cured. And a first adhesive curing portion formed as described above.

  The inventors of the present invention have found that the sound of the vertical transformer can be suppressed by changing the fixing structure of the core to the bobbin as described above. In other words, the core cannot be fixed to the bobbin sufficiently by bonding the cores, winding the tape around the outer periphery of the transformer, or bonding the opposing surfaces of the core and the bobbin. Is difficult. However, the vertical transformer according to the present invention has a first inclined surface in which the first bobbin rises in the first direction from the first core mounting surface, and the first connecting portion side surface of the core and the first bobbin. A first adhesive curing portion connecting the first inclined surface. Such a fixing structure by the first adhesive curing portion has high durability against vibration generated in the transformer, and can firmly fix the core to the first bobbin. The transformer which concerns on can suppress a sound.

  Further, in the fixing structure in which the facing surfaces of the core and the bobbin are bonded to each other, when the strength of the first bobbin (particularly the material constituting it) is low, the first bobbin may be damaged, such as cracking, or may be peeled off. Although it may arise, the fixing structure by the 1st adhesive agent hardening part which concerns on this invention can prevent such a problem suitably. Furthermore, in the vertical transformer according to the present invention, the distance between the first inclined surface and the first connection portion side surface is relatively narrow at a portion close to the first core mounting surface and is separated from the first core mounting surface. It is relatively wide at the part to be. In the vertical transformer having such a structure, the adhesive can be easily injected from the side where the distance between the first inclined surface and the side surface of the first connecting portion is wide, and the injected adhesive is the adhesive surface. To the first inclined surface and the side surface of the first connecting portion. Therefore, the vertical transformer according to the present invention is easy to manufacture, and the first adhesive curing portion can reliably connect the first inclined surface and the first connection portion side surface. In addition, the vertical transformer according to the present invention can reduce the amount of adhesive necessary for bonding compared to the case where the first inclined surface is not provided, and is high while suppressing the amount of adhesive used. Adhesive strength can be achieved.

  In addition, for example, the first bobbin is disposed on both sides of the first connecting portion in a direction parallel to the installation surface and intersecting the second direction, and from the first core mounting surface. You may have the positioning surface which stands | starts up substantially perpendicularly.

  In addition to the first inclined surface that rises from the first core mounting surface, the vertical transformer can easily move the core with respect to the first bobbin by having a positioning surface that rises vertically from the first core mounting surface. Positioning is possible, and assembly can be performed easily and accurately.

  The positioning surfaces may be disposed at both ends of the first core mounting surface in the second direction so as to sandwich the first inclined surface.

  By positioning the positioning portions at both ends in the second direction on the core mounting surface, it is possible to improve the positioning accuracy of the core. In addition, such an arrangement makes it possible to form the first adhesive cured portion formed between the positioning portions long along the second direction, and contributes to an improvement in adhesive strength.

  Further, for example, the first inclined portion may be inclined by 15 degrees to 60 degrees with respect to the first core mounting surface.

  Although the inclination angle of the first inclined portion is not particularly limited, the effect of inducing the adhesive to the adhesive surface and the effect of suppressing the amount of adhesive used are suitably obtained by setting the inclination angle to 15 to 60 degrees. Can do.

Further, for example, the vertical transformer according to the present invention includes a second hollow cylinder portion around which one of the first coil and the second coil is wound, and the second connection in the second hollow cylinder portion. A second bobbin having a second core mounting surface that is connected to an end portion on the side close to the portion and extends substantially parallel to the installation surface and faces the second connection portion. well,
One of the first coil and the second coil may be wound around the first bobbin.

  The present invention is also suitably applied to a vertical transformer in which a bobbin has a two-piece structure. As described above, since the fixing structure according to the present invention has good durability even when the strength of the first bobbin is low, the choice of the material constituting the first bobbin is widened. Thus, in the transformer according to the present invention, it is possible to obtain the effect of preventing noise while adopting a structure that simplifies assembly, such as a fitting structure using the elastic deformation of the first bobbin.

In addition, for example, the second bobbin is disposed on both sides of the second connection portion in a direction parallel to the installation surface and intersecting the second direction, and from the second core mounting surface. It may have a second inclined surface that rises in a direction opposite to the first direction,
Between the second connection portion side surface which is a surface extending in a direction intersecting the second core mounting surface in the second connection portion and the second inclined surface of the second bobbin, the second connection portion A second adhesive curing portion that is formed by connecting the side surface and the second inclined surface and curing the adhesive may be formed.

  In the case of a vertical transformer in which the bobbin has a two-piece structure, an adhesive structure similar to that of the first bobbin and the core can be adopted between the second bobbin and the core. A vertical transformer employing such an adhesive structure can fix the core more firmly to the bobbin, and can be expected to further prevent noise.

  In the vertical transformer according to the present invention, one of the first coil and the second coil may be disposed on the inner peripheral side of the other of the first coil and the second coil. .

  A transformer that employs a double structure in which one coil is disposed on the inner peripheral side of the other coil is advantageous in terms of reducing the height, but the bobbin structure tends to be more complicated than a single structure transformer. is there. Since the fixing structure according to the present invention has good durability even when the strength of the first bobbin is low as described above, the transformer according to the present invention has a degree of freedom in design regarding the material and shape of the bobbin. Is expensive. Therefore, the transformer according to the present invention, which has a double structure, can ensure good durability and quietness, and can be easily manufactured by adopting a fitting structure or the like. You can also.

FIG. 1 is an overall perspective view of a transformer according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the transformer shown in FIG. FIG. 3 is a perspective view of a first bobbin included in the transformer shown in FIG. FIG. 4 is a cross-sectional view of the transformer with a cross section perpendicular to the installation surface. FIG. 5 is an enlarged cross-sectional view around the first inclined surface in the first bobbin and its modification. FIG. 6 is an enlarged cross-sectional view of the vicinity of the adhesive curing portion in the first bobbin according to the reference example.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
As shown in FIG. 1, the transformer 10 according to an embodiment of the present invention includes a core 12, a first bobbin 50, and a second bobbin 40.

  The core 12 of the transformer 10 is made of, for example, a soft magnetic material such as ferrite, and forms a magnetic path through which magnetic flux generated by first and second coils 30 and 20 described later passes. The core 12 includes a middle leg 15, side legs 16 and 18, a first connection part 13, and a second connection part 14 (see FIG. 2). The middle leg 15 of the core 12 extends substantially parallel to a first direction (Z-axis direction in the drawing) which is a direction perpendicular to the installation surface 90 of the transformer 10, and the first coil 30 and the second coil 20 is inserted. The side legs 16 and 18 extend substantially parallel to the Z-axis direction like the middle legs 15 and have substantially the same length as the middle legs 15. The side legs 16 and 18 are disposed so as to sandwich the middle leg 15 from both sides in the Y-axis direction.

  As shown in FIG. 1 and FIG. 2, the first connecting portion 13 of the core 12 is a second direction (a direction parallel to the installation surface 90 and connecting the middle leg 15 and the side legs 16, 18). It extends substantially parallel to the Y-axis direction in the drawing) and connects one end of the middle leg 15 and one end of the side legs 16, 18. On the other hand, as shown in FIG. 2, the second connection portion 14 of the core 12 extends substantially in parallel to the Y-axis direction like the first connection portion 13, and the other end portion of the middle leg 15. The other ends of the side legs 16 and 18 are connected. In the present embodiment, of the connection portions 13 and 14 that connect the middle leg 15 and the side legs 16 and 18, the side that is separated from the installation surface 90 (see FIG. 1) of the transformer 10 is the first connection portion 13. The side closer to the installation surface 90 than the first connecting portion 13 is defined as the second connecting portion 14. However, on the contrary, the side which is spaced apart from the installation surface 90 of the transformer 10 is defined as the second connection portion, and the side closer to the installation surface 90 than the second connection portion is defined as the first connection portion. Are also included in the embodiments of the present invention. The installation surface 90 of the transformer 10 means the bottom surface of the transformer 10 that faces the substrate when the transformer 10 is installed on the substrate. As shown in FIG. 1, the installation surface 90 is a surface parallel to the XY plane.

  As shown in FIG. 2, the core 12 is formed by assembling a first core 12a and a second core 12b, which are two parts molded separately. The first core 12a and the second core 12b have a symmetrical shape, and are joined to each other so as to sandwich the first bobbin 50 and the second bobbin 40 from the vertical direction (Z-axis direction in the drawing). Each of the first core 12a and the second core 12b has a substantially E-shaped longitudinal section (a cut surface including the Y axis and the Z axis in FIG. 1).

  In the drawing, the Z-axis (first direction) is the height direction of the transformer 10, and the height of the transformer can be reduced as the height of the transformer 10 in the Z-axis direction becomes shorter. Further, the X axis and the Y axis are perpendicular to each other and perpendicular to the Z axis. In this embodiment, the Y axis corresponds to the arrangement direction of the first terminals 72 and the middle legs 15 and the side legs 16 and 18. The X-axis coincides with the longitudinal direction of the transformer 10.

  As shown in FIG. 2, the second bobbin 40 includes a bobbin substrate 42 having a substantially rectangular flat plate shape. A second core mounting surface 45 extending substantially parallel to the installation surface 90 is formed on a part of the lower surface of the bobbin substrate 42. The second core mounting surface 45 is connected to the end portion of the second hollow cylinder portion 44 on the side close to the second connection portion 14 (the lower end portion of the second hollow cylinder portion 44). It arrange | positions so that 2 connection part 14 may be opposed.

  On the other part of the lower surface of the bobbin substrate 42, an installation surface 90 of the transformer 10 is formed. The installation surface 90 is located on the lower side (Z-axis negative direction side) than the second core mounting surface 45. A plurality (four in the illustrated example) of second terminals 70 are fixed at predetermined intervals along the Y-axis direction at one end of the bobbin substrate 42 in the X-axis direction. A plurality (eight in the illustrated example) of first terminals 72 are fixed at predetermined intervals along the Y-axis direction at the other end of the bobbin substrate 42 in the X-axis direction.

  These terminals 70 and 72 are made of, for example, metal terminals, and are integrally formed by insert molding or the like on the bobbin substrate 42 made of an insulating material such as synthetic resin. As will be described later, the lead portion of the second coil 20 is connected to the second terminal 70, and the lead portion of the first coil 30 is connected to the first terminal 72. As described above, the bobbin substrate 42 serves as a terminal installation portion on which the terminals 70 and 72 electrically connected to the coils 20 and 30 are installed.

  A second hollow cylindrical portion 44 (see FIG. 4) is formed in a substantially central position of the bobbin substrate 42 so as to protrude in the Z-axis direction. A bobbin collar portion 48 is connected to an upper end portion of the second hollow cylinder portion 44. The bobbin collar 48 has a shape that protrudes in the radial direction from the second hollow cylinder 44 substantially parallel to the XY plane, and has a function of holding the second coil 20. The bobbin substrate 42, the second hollow cylinder portion 44, and the bobbin collar 48 are preferably integrally formed by injection molding or the like.

  The bobbin substrate 42, the second hollow cylinder portion 44, and the bobbin flange portion 48 are formed with through holes 44a penetrating them in the Z-axis direction. The shape of the through hole 44a coincides with the shape of a through hole 52a formed in the first bobbin 50, which will be described later, and as shown in FIG. 2, the middle leg in the core 12 (first core 12a, second core 12b). 15 (15a, 15b) has an elliptical shape that can be inserted. Although hidden in FIG. 2, the opening on the Z axis negative direction side of the through hole 44 a is formed in the second core mounting surface 45 of the bobbin substrate 42.

  As shown in FIG. 4, the second coil 20 is wound around the outer periphery of the second hollow cylinder portion 44. The second hollow cylinder portion 44 functions as a bobbin main body of the second coil 20.

  A perspective view of the second coil 20 is shown in FIG. As shown in FIGS. 2 and 4, the second coil 20 has a shape that follows the outer peripheral shape of the second hollow cylindrical portion 44, and has an elliptical shape similar to the outer periphery of the second hollow cylindrical portion 44. As shown in FIGS. 2 and 4, the second coil 20 is accommodated in a first hollow cylinder portion 54 of the first bobbin 50 described later, and is wound around the outer periphery of the first hollow cylinder portion 54. The first coil 30 is arranged on the inner peripheral side.

  As shown in FIG. 2, concave portions 43 for allowing the side legs 16b and 18b of the second core 12b to pass are formed on both side surfaces of the bobbin substrate 42 in the X-axis direction. The recesses 43 are formed at both ends of the second core mounting surface 45 in the Y-axis direction, and are disposed so that the positions in the X-axis direction are the same as those of the second hollow cylinder portion 44. Further, on both side surfaces of the bobbin substrate 42 in the Y-axis direction, engagement protrusions 49 that are detachably engaged with engagement holes 59a of the first bobbin 50 described later are formed on both sides of the recess 43 in the X-axis direction. ing.

  As shown in FIGS. 2 and 4, the first bobbin 50 holds the first coil 30 (see FIG. 4 and the like) and defines a part of the outer shape of the transformer 10. As shown in FIGS. 2 and 4, the first bobbin 50 has a first hollow cylinder portion 54 around which the first coil 30 is wound. The first hollow cylinder portion 54 functions as a bobbin main body of the first coil 30.

  An upper collar portion 52 that protrudes in the radial direction from the first hollow cylinder portion 54 along the XY plane is formed at an upper end portion of the first hollow cylinder portion 54. As shown in FIG. 2, the upper collar part 52 is formed with a through hole 52a through which the middle leg 15a of the first core 12a is inserted.

  A first core mounting surface 53 extending substantially parallel to the installation surface 90 is formed on the upper surface of the upper collar portion 52. The first core mounting surface 53 is connected to the end portion of the first hollow cylinder portion 54 that is close to the first connection portion 13 (the end portion above the first hollow cylinder portion 54). The first core mounting surface 53 faces the first connection portion 13 of the core 12, and the first connection portion 13 of the core 12 is mounted on the first core mounting surface 53 in the assembled state of the transformer 10. It becomes.

  As shown in FIG. 3, first inclined surfaces 61 are formed on both sides in the X-axis direction of the first core mounting surface 53 of the first bobbin 50. As shown in FIG. 1, in the assembled transformer 10, the first inclined surface 61 has the first inclined surface 61 of the core 12 in the X-axis direction (a direction parallel to the installation surface 90 and having a tolerance in the Y-axis direction). It arrange | positions on both sides on both sides of the connection part 13. As shown in FIG. As shown in FIGS. 1 and 3, the first inclined surface 61 is an inclined surface that rises upward (Z-axis positive direction) from the first core mounting surface 53.

  As shown in FIG. 3, the first inclined surface 61 according to the present embodiment includes a central portion 61 a disposed at a position close to the through hole 52 a through which the middle leg 15 is inserted, and the central portion 61 a from both sides in the Y-axis direction. And a side portion 61b disposed between the side portions 61b. The side portion 61b is configured by a plane extending in a direction intersecting the first core mounting surface 53, and the central portion 61a is formed by a curved surface that intersects the first core mounting surface 53 and curves along the Y-axis direction. Composed. However, the surface constituting the first inclined surface 61 is not particularly limited as long as it is a surface inclined upward from the first core mounting surface 53, and the first inclined surface 61 is a combination of a plurality of flat surfaces and curved surfaces. It may be constituted by.

  The first inclined surface 61 functions as an adhesive bonding surface that fixes the core 12 to the first bobbin 50. As shown in FIG. 4, a first adhesive curing portion 82 is formed between the first connection portion side surface 13 a of the core 12 and the first inclined surface 61. The first adhesive curing portion 82 connects the first inclined surface 61 of the first bobbin 50 and the first connection portion side surface 13 a of the core 12, and fixes the core 12 to the first bobbin 50. The first connection portion side surface 13 a is a surface extending in a direction intersecting the first core mounting surface 53 in the first connection portion 13, and is substantially perpendicular to the first core mounting surface 53 in the present embodiment. Extending in any direction.

  As shown in FIG. 3, in addition to the first inclined surface 61, the first connecting portion 13 of the core 12 is positioned on both sides in the X-axis direction of the first core mounting surface 53 of the first bobbin 50. A portion 60 is formed. The positioning unit 60 protrudes from the first core mounting surface 53 in the Z-axis direction (first direction). As shown in FIG. 1, the positioning portions 60 are formed on both sides of the first connecting portion 13 along the X-axis direction that is parallel to the installation surface 90 and intersects the Y-axis direction. ing.

  The positioning unit 60 includes a positioning surface 60 a that is in contact with the first connection unit 13 or is the portion of the positioning unit 60 that is closest to the first connection unit 13. As shown in FIG. 1, the positioning surface 60 a is formed to rise substantially vertically from the first core mounting surface 53, faces the first connection portion side surface 13 a that is the side surface of the first connection portion 13, and Positioning in the X-axis direction (direction orthogonal to the Y-axis direction) of the one connection portion side surface 13a can be performed.

  A plurality of positioning surfaces 60a are preferably arranged at a predetermined interval along a direction substantially parallel to the Y-axis direction (second direction). In the present embodiment, the first core mounting surface 53 is disposed at two positions on the both ends in the Y-axis direction, for a total of four positions, and the first slope described above is provided between the positioning surfaces 60a disposed at both ends. The surface 61 is sandwiched. The first inclined surface 61 is formed so as to connect the positioning portions 60 arranged at both ends, and has a role of improving the strength of the upper collar portion 52 and the first bobbin 50.

  A first adhesive curing portion 82 is formed in a region surrounded by the positioning portion 60, the first inclined surface 61, and the first connection portion side surface 13a shown in FIG. As shown in FIG. 4, which is a cross-sectional view, the first adhesive curing portion 82 is obtained by curing the adhesive that bonds the first connection portion 13 of the core 12 and the first bobbin 50. The side surface 13a and the first inclined surface 61 are connected. The first adhesive curing portion 82 extends in the Y-axis direction along the first inclined surface 61 and the first connecting portion side surface 13a, and the first adhesive curing portion 82 and the first connecting portion side surface 13a and the first inclined surface. Connecting the surface 61 is not only a cross section (FIG. 4) passing through the middle legs 15 (15a, 15b), but also a cross section passing between the middle legs 15 and the side legs 16, 18 (see FIG. 5 (a)). ) Is the same. In FIG. 1, the adhesive curing portion 82 is not illustrated in order to represent the shape of the inclined surface 61 and the like of the first bobbin 50.

  Although not shown in FIG. 1, as shown in FIG. 4, the first hollow cylinder portion 54 of the first bobbin 50 projects vertically downward from the lower surface of the upper flange portion 52 in the Z-axis direction. . The first hollow cylinder portion 54 has a shape that covers the bobbin collar 48 shown in FIG. 2 from the outer periphery. As shown in FIG. 4, the second coil 20 and the middle legs 15 (15a, 15b) It comes to store in. In other words, the inside of the first hollow cylinder portion 54 is inserted through the middle leg 15 and the second coil 20.

  As shown in FIGS. 1 and 3, a rectangular lower collar portion 58 is formed substantially parallel to the XY plane at the lower end of the first hollow cylinder portion 54. The lower collar part 58 is mounted so as to cover the upper surface of the bobbin substrate 42 of the second bobbin 40.

  Side portions 59 projecting downward are formed at both ends of the lower collar portion 58 in the Y-axis direction. An engagement hole 59 a that engages with the engagement protrusion 49 of the second bobbin 40 is formed in the side surface portion 59. The first bobbin 50 and the second bobbin 40 are assembled by engaging the engagement protrusions 49 with the engagement holes 59a using the elastic deformation of the side surface portion 59.

  As shown in FIGS. 1 and 4, the first coil 30 is divided and disposed along the Z-axis direction on the outer peripheral surface of the first hollow cylinder portion 54 located between the upper flange portion 52 and the lower flange portion 58. One or more intermediate brim portions 56 are provided according to the use of the transformer 10 or the like. These flanges 52, 56, and 58 are parallel to the XY plane. The first bobbin 50 having the flange portions 52, 56, 58 and the first hollow cylinder portion 54 is integrally formed by injection molding or the like. As shown in FIG. 4, the first coil 30 is wound around the first hollow cylinder portion 54, and the transformer 10 includes the second coil 20 and the first coil 30 around the middle leg 15 of the core 12. It has a double structure that goes around twice.

  As shown in FIG. 4, the first coil 30 of the present embodiment is configured by two independent coils, but the first coil 30 may be configured by one coil, and may be configured by three or more coils. It may be configured. The first coil 30 is in contact with the first hollow cylinder portion 54, and the winding shape of the first coil 30 and the outer peripheral shape of the first hollow cylinder portion 54 are egg shapes.

  As shown in FIG. 1, the distal end portion in the X direction of the intermediate collar portion 56 extends to the end portion of the bobbin substrate 42 on which the first terminal 72 is formed, and the lead wire 33 of the first coil 30 is connected to the first wire 33. A lead groove 57 a for guiding to the terminal 72 is formed. The lower collar portion 58 of the first bobbin 50 also extends to the end portion in the X-axis direction of the bobbin substrate 42, similarly to the intermediate collar portion 56, and a lead groove portion 58 a that guides the lead wire 33 to the first terminal 72. Is formed.

  The transformer 10 according to the present embodiment is produced by assembling the members shown in FIG. 2 and winding a winding around the second bobbin 40 and the first bobbin 50. Hereinafter, an example of a method for manufacturing the transformer 10 will be described with reference to FIG. In creating the transformer 10, first, the second bobbin 40 to which the second terminal 70 and the first terminal 72 are attached is prepared. The material of the second bobbin 40 is not particularly limited, but the second bobbin 40 is formed of an insulating material such as a resin, and it is particularly preferable to use a phenol resin or the like from the viewpoint of heat resistance and the like.

  Next, a winding is wound around the second hollow cylinder portion 44 of the second bobbin 40 to form the second coil 20 (see FIG. 4). Although it does not specifically limit as a winding used for formation of the 2nd coil 20, A litz wire etc. are used suitably. Further, the end portion of the winding when forming the second coil 20 is entangled and connected to the second terminal 70 through the communication path 47 (see FIG. 4) of the second bobbin 40.

  Next, the 1st bobbin 50 shown in FIG. 2 is attached with respect to the 2nd bobbin 40 in which the 2nd coil 20 was formed. The first bobbin 50 and the second bobbin 40 are assembled by engaging the engagement hole 59 a of the first bobbin 50 with the engagement protrusion 49 of the second bobbin 40. Moreover, the 1st bobbin 50 and the 2nd bobbin 40 are fixed by adhesion | attachment etc. as needed. The material of the first bobbin 50 is not particularly limited, and is formed of an insulating material such as resin. However, it is preferable to use PET (polyethylene terephthalate) or the like from the viewpoint of easy elastic deformation.

  Next, a winding is wound around the first hollow cylinder portion 54 of the first bobbin 50 to form the first coil 30 (see FIG. 4). Although it does not specifically limit as a winding used for formation of the 1st coil 30, A litz wire etc. are used suitably. The lead wire 33 that is the end of the winding when the first coil 30 is formed is engaged with the lead groove portions 57 a and 58 a and wound around the first terminal 72.

  Next, with respect to the intermediate assembly in which the second coil 20, the first coil 30, the first bobbin 50, and the second bobbin 40 are combined, the first core 12a and the second core 12a of the core 12 from the vertical direction in the Z-axis direction. The core 12b is attached to form the core 12. That is, the tips of the middle legs 15a and 15b of the first core 12a and the second core 12b, the tips of the side legs 16a and 16b, and the tips of the side legs 18a and 18b are joined. A gap may be provided between the tips of the middle legs 15a and 15b. The first core 12a and the second core 12b of the core 12 are bonded using an adhesive. Examples of the material of the core 12 include soft magnetic materials such as metal and ferrite, but are not particularly limited.

  Next, by applying an adhesive between the first connecting portion side surface 13a indicated by the arrow A in FIG. 1 and the first inclined surface 61, a first adhesive curing portion 82 as shown in FIG. 4 is formed. The core 12 is fixed to the first bobbin 50. The adhesive that forms the first adhesive curing portion 82 is not particularly limited, but the use of a relatively viscous adhesive such as a silicon-based adhesive causes the first connecting portion side surface 13a to extend in a direction intersecting each other. From the viewpoint of use for connection between the first inclined surface 61 and the first inclined surface 61. In addition, the gap formed between the connection portion side surface 13a and the upper end portion of the first inclined surface 61 is designed to have a width that allows the nozzle for discharging the adhesive to appropriately approach the application surface.

  Further, in addition to bonding between the core 12 and the first bobbin 50, the core 12 and the second bobbin 40 may be bonded. As shown in FIG. 4, a second inclined surface 46 rising from the second core mounting surface 45 (see FIG. 2) toward the Z-axis negative direction is formed on a part of the lower surface of the bobbin substrate 42. It is formed on both sides in the X-axis direction with the second connection portion 14 in between. Therefore, an adhesive is applied between the second connection portion side surface 14a that is the side surface of the second connection portion 14 and the second inclined surface 46, and the second connection portion side surface 14a and the second inclined surface 46 are connected. You may form the 2 adhesive hardening part 83. FIG. Note that the second connection portion side surface 14a is a surface extending in a direction intersecting the second core mounting surface 45 in the second connection portion 14, and is substantially perpendicular to the second core mounting surface 45 in the present embodiment. Extending in any direction.

  Finally, a tape may be wound around the outer periphery and a varnish impregnation process may be performed. Through the steps as described above, the transformer 10 according to the present embodiment can be manufactured.

  The transformer 10 is a vertical transformer in which the middle leg 15 extends substantially parallel to the Z-axis direction (normal direction of the installation surface 90) perpendicular to the installation surface 90. As shown in FIGS. 1 and 4, the vertical transformer 10 has the connecting portions 13, 14 of the core 12 arranged in the vertical direction of the Z axis of the first and second coils 30, 20. , 14 has an effect of suppressing leakage magnetic flux in the vertical direction. Therefore, the transformer 10 can suppress the leakage magnetic flux in the vertical direction of the transformer 10 as compared with the horizontal type in which the vertical direction of the coil is hardly shielded by the core.

  As shown in FIG. 4, the transformer 10 has a double structure in which the first coil 30 circulates around the outer periphery of the second coil 20. By adopting a double structure, the transformer 10 can shorten the length of the core 12 in the axial direction, and can realize a thin coil while being vertical.

  With such an arrangement of the core 12, the transformer 10 can prevent the generation of eddy currents in the surrounding structural material and the like without providing an aluminum shielding plate or the like. Further, by preventing the generation of eddy current, the transformer 10 can reduce the generation of heat and noise accompanying the generation of eddy current. Moreover, since the transformer 10 does not need to be provided with a shielding plate for shielding leakage magnetic flux, it has good heat dissipation characteristics. Furthermore, since the length of the middle leg 15 and the side legs 16 and 18 of the core 12 of the transformer 10 is short, the core 12 can be prevented from being damaged by an external impact or the like.

  Here, the vertical transformer according to the prior art has a problem that noise is generated during driving. In the transformer 10 according to the present embodiment, the sound generation during driving is suppressed by improving the fixing structure between the core 12 and the first bobbin 50. That is, the transformer 10 has a first adhesive curing portion 82 that connects the first connection portion side surface 13a of the core 12 and the first inclined surface 61 of the first bobbin 50, as shown in FIG. . The first adhesive curing portion 82 as shown in FIG. 4 has high durability against vibration generated in the transformer 10, and can firmly fix the core 12 to the first bobbin 50. Therefore, the transformer 10 can suppress noise.

  Further, the fixing structure by the first adhesive curing portion 82 in the transformer 10 is damaged such as adhesion peeling and cracking of the first bobbin 50 compared to the fixing structure in which the facing surfaces of the core 12 and the first bobbin 50 are bonded to each other. Can be suitably applied to the case where the strength of the first bobbin 50 is relatively low.

  Further, the first inclined surface 61 has an effect of guiding the adhesive injected at the time of assembly to a desired adhesive surface and an effect of reducing the amount of adhesive necessary for adhesion. FIG. 6 is an enlarged cross-sectional view of the upper collar portion 92 in the first bobbin according to the reference example. In the reference example, since the first inclined surface is not formed on both sides of the first core mounting surface 53, the adhesive curing portion 93 is spread along the first core mounting surface 53, The adhesive has not been successfully guided to the first connection portion side surface 13a, which is an adhesive surface. On the other hand, in the transformer 10 according to the present embodiment, as shown in FIG. 5A, the first inclined surfaces 61 are formed on both sides of the first core mounting surface 53, and the first connecting portion side surface 13a. The adhesive injected between the first inclined surface 61 and the first inclined surface 61 is preferably guided to the first connection portion side surface 13a. Therefore, the 1st adhesive hardening part 82 (refer FIG. 4) which connects the 1st connection part side surface 13a and the 1st inclined surface 61 connects the 1st inclined surface 61 and the 1st connection part side surface 13a reliably and firmly. Can be connected.

  Moreover, since the transformer 10 according to the present embodiment can guide the adhesive to the adhesive surface, it is possible to suppress the usage fee of the adhesive as compared with the reference example shown in FIG. . Although the inclination angle α (see FIG. 5A) of the first inclined surface 61 with respect to the first core mounting surface 53 is not particularly limited, for example, the first inclined surface 61 and the first inclined surface may be 15 to 60 degrees. It is preferable from the viewpoint of suppressing the amount of adhesive used while ensuring the reliability of adhesion with the connection portion side surface 13a.

  As shown in FIGS. 1 and 3, in the transformer 10 according to the present embodiment, positioning surfaces 60 a for positioning the first connection side surface 13 a are formed on both sides of the first core mounting surface 53. The first core 12a can be easily positioned with respect to the first bobbin 50 during assembly. The length of the positioning surface 60a in the Y-axis direction is shorter than the total length of the first core mounting surface 53 in the Y-axis direction in order to secure the formation area of the first inclined surface 61 and the first adhesive curing portion 82. . When a plurality of positioning surfaces 60 a are arranged along the Y direction, the total length of the positioning portions 60 a arranged along the Y direction is shorter than the total length of the first core mounting surface 53 in the Y axis direction.

  As shown in FIG. 1, the positioning surfaces 60 a are arranged at both ends in the Y-axis direction of the first core mounting surface 53 so as to sandwich the first inclined surface 61, thereby improving the positioning accuracy of the core 12. From the viewpoint of making it. Further, such an arrangement makes it possible to form the first adhesive curing portion 82 long along the second direction, and improve the adhesive strength between the core 12 and the first bobbin 50.

  Furthermore, the first bobbin 50 having the first inclined surface 61 connected to the core 12 by the first adhesive curing portion 82 is particularly preferably used as an upper bobbin in the transformer 10 having a plurality of bobbins. This is because the transformer 10 can employ a material such as PET having a relatively low strength as the first bobbin 50 due to the excellent fixing structure of the first bobbin 50 and the core 12, and elastically deform the side surface portion 59. A structure that simplifies assembly, such as a fitting structure used, can be employed. Unlike the second bobbin 40 provided with the terminals 70 and 72, the first bobbin 50 is not required to have heat resistance necessary for soldering and the like, and from this point of view, the material selection range is wide. .

Other Embodiments As shown in FIGS. 1 to 4, in the above-described embodiment, a transformer having a plurality of bobbins such as the first bobbin 50 and the second bobbin 40 has been described as an example. It is also possible to apply to a transformer in which the first and second coils 20 and 30 are wound around one bobbin. The present invention is applicable not only to a double-structure transformer 10 in which one coil is arranged on the inner peripheral side of the other coil, but also to a single-structure transformer in which two coils are arranged along the Z direction. can do. In such a case as well, effects such as sound prevention can be achieved as in the case of the transformer 10 described above. Further, the first or second connecting portions 13 and 14 of the core and the first or second core mounting surfaces 53 and 45 facing the core may be in contact with each other. There may be a mode in which a gap is formed between the two.

  The shapes of the first inclined surface 61 and the second inclined surface 46 formed on the first bobbin 50 and the second bobbin 40 are not limited to those shown in FIGS. Examples are possible. The first inclined surface may be a concave curved surface in the XZ cross section, for example, as in the first inclined surface 63 of the upper flange portion 62 shown in FIG. 5B, and the upper flange portion shown in FIG. Like the 64 first inclined surfaces 65, the XZ section may be a convex curved surface.

  In the above-described embodiment, the cross-sectional shape of the middle leg 15 (15a, 15b) of the core 12 is an ellipse, but the cross-sectional shape of the middle leg 15 is not particularly limited, and may be other shapes such as a circle, a polygon or the like. There may be. The shape of the core 12 is not limited to the shape having the two side legs 16 and 18 with the middle leg 15 interposed therebetween, and may be a shape having only one side leg. Moreover, it is not specifically limited about the winding shape of the 2nd coil 20 and the 1st coil 30, Other shapes, such as a circle | round | yen and a polygon, may be sufficient.

  Further, the names of “first” and “second” for the coil and the terminal are for convenience, and the “first” side does not need to be the input side, and the “first” side may be the output side. .

DESCRIPTION OF SYMBOLS 10 ... Transformer 12 ... Core 12a ... 1st core 12b ... 2nd core 13 ... 1st connection part 13a ... 1st connection part side surface 14 ... 2nd connection part 15 ... Middle leg 16, 18 ... Side leg 20 ... 2nd coil DESCRIPTION OF SYMBOLS 30 ... 1st coil 33 ... Lead wire 40 ... 2nd bobbin 42 ... Bobbin board | substrate 43 ... Recessed part 44 ... 2nd hollow cylinder part 44a, 52a ... Through-hole 45 ... 2nd core mounting surface 46 ... 2nd inclined surface 48 ... Bobbin ４９ part 49 ... engaging protrusion 50 ... first bobbin 52, 62, 64 ... upper collar part 53 ... first core mounting surface 54 ... first hollow cylinder part 56 ... intermediate collar part 57a, 58a ... lead groove part 58 ... bottom Hook 59 ... Side 59a ... Engagement hole 60 ... Positioning part 60a ... Positioning surface 61, 63, 65 ... First inclined surface 61a ... Central part 61b ... Side part 70 ... Second terminal 72 ... First terminal 82 ... First 1 adhesive curing part 83 ... 2nd Chakuzai cured portion 90 ... installation surface

Claims (7)

A middle leg extending substantially parallel to a first direction that is perpendicular to the installation surface and passing through the first coil and the second coil; and a side leg extending substantially parallel to the first direction; , One end of the middle leg and one of the side legs extending in a second direction which is a direction parallel to the installation surface and connecting the middle leg and the side leg. A first connecting portion that connects the end of the second leg, and a second connecting portion that extends substantially parallel to the second direction and connects the other end of the middle leg and the other end of the side leg. A core having,
The first hollow cylinder part around which at least one of the first coil and the second coil is wound is connected to the end part of the first hollow cylinder part on the side close to the first connection part. A first core mounting surface extending substantially parallel to the installation surface and facing the first connection portion; and the first connection portion in a direction parallel to the installation surface and intersecting the second direction. A first bobbin having a first inclined surface disposed on both sides with the first inclined surface rising from the first core mounting surface in the first direction;
The first connecting portion side surface which is a surface extending in a direction intersecting the first core mounting surface in the first connecting portion is connected to the first inclined surface of the first bobbin, and the adhesive is cured. A vertical transformer having a first adhesive curing portion formed as described above.   The first bobbins are arranged on both sides of the first connecting portion in a direction parallel to the installation surface and intersecting the second direction, and rise substantially vertically from the first core mounting surface. The vertical transformer according to claim 1, further comprising a positioning surface.   3. The vertical transformer according to claim 2, wherein the positioning surfaces are disposed at both ends of the first core mounting surface in the second direction so as to sandwich the first inclined surface therebetween. .   The vertical transformer according to any one of claims 1 to 3, wherein the first inclined portion is inclined at 15 to 60 degrees with respect to the first core mounting surface. It is connected to a second hollow cylinder part around which either one of the first coil and the second coil is wound, and an end part of the second hollow cylinder part on the side close to the second connection part. A second bobbin having a second core mounting surface extending substantially parallel to the installation surface and facing the second connection portion;
The vertical transformer according to any one of claims 1 to 4, wherein one of the first coil and the second coil is wound around the first bobbin. The second bobbins are arranged on both sides of the second connecting portion in a direction parallel to the installation surface and intersecting the second direction, and are arranged from the second core mounting surface to the first direction. A second inclined surface that rises in the opposite direction of
Between the second connection portion side surface which is a surface extending in a direction intersecting the second core mounting surface in the second connection portion and the second inclined surface of the second bobbin, the second connection portion The vertical transformer according to claim 5, wherein a second adhesive curing portion that connects a side surface and the second inclined surface and is formed by curing the adhesive is formed.   Either one of the first coil and the second coil is disposed on the inner peripheral side of the other one of the first coil and the second coil. A vertical transformer according to any one of the above.

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