JP5046141B2 - Coil bobbin and transformer using the coil bobbin - Google Patents

Description

  The present invention relates to a coil bobbin and a transformer using the coil bobbin. In particular, one type of coil bobbin can cope with a plurality of types of transformers and winding components such as inductances having different numbers of turns and creepage distances. The present invention relates to a coil bobbin that can be used and a transformer using the coil bobbin.

  2. Description of the Related Art Conventionally, there has been known a transformer that uses a coil bobbin whose height (same as that in the length direction, the same applies below) can be adjusted with a single type of coil bobbin for a plurality of types of transformers. (For example, refer to Patent Document 1).

  In a transformer known from Patent Document 1, a bobbin main body and a base part forming a bobbin are separated from each other, and a plurality of annular recesses or male threads are formed on the outer periphery of a lower end part of the cylindrical part of the bobbin main body. Is provided in the support hole of the base part through which the thread is inserted, and a convex part engaged with the annular concave part on the bobbin main body side or a female screw to be screwed with the male screw. And by pushing the lower end of the bobbin body into the support hole of the base part and changing the position of the annular concave part on the base part side that engages with the convex part on the cylindrical part side, or changing the screwing amount of the cylindrical part with respect to the support hole, The height of the cylindrical part to which the coil is mounted is changed.

JP 2007-80852 A

  However, in the coil bobbin in the transformer known from Patent Document 1, the adjustment amount of the height dimension of the cylindrical portion is limited to the height dimension of the base portion, and a large height adjustment cannot be performed. Moreover, in the structure which adjusts by changing the screwing amount of a cylindrical part, since the core is inserted in a cylindrical part, it becomes an adjustment for every round and becomes a stepwise adjustment. On the other hand, in the case of a coil bobbin that adjusts the height of the cylindrical portion by engaging the convex portion with the annular concave portion, the adjustment amount is a pitch value request for each pitch of the annular concave portion. Therefore, there is a problem that fine height adjustment cannot be performed in any structure. For this reason, when performing fine height adjustment, the spacer etc. which fill up the clearance gap between a coil and a collar part were required.

  Therefore, the present invention has been made in view of the above problems, and is capable of properly dealing with a plurality of types of winding components having different numbers of turns and creepage distances with a single type of coil bobbin. An object is to provide a coil bobbin and a transformer using the coil bobbin.

  In order to solve the above-described problems, a transformer coil bobbin according to the present invention includes a first bobbin half and a second bobbin half in a coil bobbin in which a coil is mounted on the outer periphery of a winding core. Each half is integrally provided with a collar and at least two core pieces projecting perpendicularly from the collar, and each core piece is alternately alternated between the two bobbin halves and the collar is slid in a direction approaching each other. It is incorporated so as to form a cylindrical core part.

According to this configuration, when the collar portions of the two bobbin halves are slid together with the core piece in the direction approaching each other, the distance between the collar portions changes, and a cylindrical shape is formed between the both collar portions. The height dimension of the winding core can be freely changed continuously. As a result, for example, in a winding component composed of a coil formed by laminating a plurality of windings obtained by edgewise winding a rectangular wire, the bobbin half is slid in a direction in which the flanges approach each other, and a plurality of windings are formed. When the coil is pressed between the buttocks and the coil is pressed, the windings are brought into close contact with each other, and the coupling force is increased.
Moreover, since the height of the winding core can be adjusted freely by sliding the bobbin halves in the direction in which the flanges approach each other, even if the number of turns of the winding or the creepage distance are different, the winding It can be used by changing to a core portion having a height most suitable for the part. Moreover, a large adjustment amount of the height can be secured.

  The said structure WHEREIN: The said core piece can employ | adopt the structure which has a stopper function to stop sliding and returning to the opposite away direction from the position where the said collar part was slid and arranged in the direction which mutually approaches.

  According to this configuration, when the bobbin halves are slid inward from each other and the coil is pressed between the buttocks, the bobbin halves are held in that position by the action of the stopper function, and the optimal coupling state of the coils Can be maintained.

  The said structure WHEREIN: The said 2 bobbin half body can employ | adopt the structure formed with the material from which hardness differs, respectively.

  According to this configuration, in the configuration in which the core pieces of the bobbin halves are slid while being rubbed with each other, if the core pieces are formed of materials having different hardnesses, the low-hardness core pieces become high-hardness core pieces. By rubbing, a stopper action is generated between the core pieces to prevent the adjusted bobbin halves from sliding and returning in the opposite direction. Also, even if the core pieces of the bobbin halves do not rub against each other, if the bobbin half on the side where the terminals are provided is made of thermosetting resin, soldering between the terminals and the winding terminals is possible. It is possible to withstand the heat generated during work, welding work, and the like.

  Further, in the above configuration, the width of the core pieces of each of the bobbin halves is formed such that the width of at least one core piece is larger than the width of the other so that the bobbin halves cannot be assembled to each other except at a predetermined position. Can be adopted.

  According to this structure, when the width dimension is changed, one bobbin half cannot be assembled even if the bobbin half is shifted by 90 ° with respect to the other bobbin half. Simple mistakes can be prevented in advance.

  Moreover, the said structure WHEREIN: The structure formed by making the direction of the crack surface of the said core piece into a perpendicular | vertical or horizontal direction is employable.

  According to this configuration, when the bobbin half is resin-molded, it is possible to divide the molding die into a state where it can be molded by moving in the horizontal or vertical direction, and the molding die device is simplified.

  Moreover, in order to solve the said subject, the structure which used the said coil bobbin can be employ | adopted for the transformer which concerns on this invention.

  According to this configuration, even in the case of a transformer using winding parts having different numbers of turns and creepage distances, the same coil bobbin can be shared without preparing different coil bobbins for a plurality of different transformers. it can.

  According to the present invention, when the core pieces of the two divided bobbin halves are slid in the direction in which the collar portions approach each other, the distance between both collar portions changes integrally with the core piece, and the cylindrical shape Since the height dimension of the wound core portion can be freely and continuously changed, one type of winding component such as a transformer with different numbers of winding turns and creepage distances can be used. A coil bobbin can be used. As a result, it is not necessary to prepare a plurality of types of coil bobbins, thereby improving economic efficiency and simplifying component management. In addition, the coupling state between the windings can be greatly improved as compared with the conventional method in which the height of the winding core is adjusted stepwise. Furthermore, since the height adjustment of the core part can be performed by sliding both bobbin halves in the direction in which the flanges approach each other, the adjustment amount is large and can be easily secured.

It is the perspective view which looked at the transformer shown as one embodiment to which the present invention is applied from the upper side. It is the perspective view which looked at the same transformer from the lower side. It is a principal part disassembled perspective view of a transformer same as the above. It is a perspective view which shows the coil bobbin of a transformer same as the above. The coil bobbin of a trans | transformer same as the above is shown, (a) is a side view in a state where a coil is not mounted, and (b) is a side view in a state where a coil is mounted. It is the sectional view on the AA line of FIG. It is a figure explaining the modification of the coil bobbin which concerns on this invention. It is a figure explaining an example which further deformed the coil bobbin shown in FIG. It is a figure explaining the other example which further deform | transformed the coil bobbin which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the accompanying drawings.

  1 to 6 show a transformer as an embodiment of the present invention. FIG. 1 is a perspective view of the same transformer as viewed from above. FIG. 2 is a perspective view of the same transformer as viewed from below. FIG. 4 is a perspective view showing a coil bobbin of the transformer, FIG. 5 is a coil bobbin of the transformer, FIG. 5A is a side view without a coil, and FIG. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. Note that the same number is assigned to the same element throughout the description of the embodiment.

  In the figure, a transformer 11 as a winding component is composed of a coil 12, a coil bobbin 13, a core 14, and the like.

  The coil 12 is an edgewise coil in which a flat wire is spirally wound in a spiral shape. In this example, the coil 12 includes three windings of a first winding 12a, a second winding 12b, and a third winding 12c. Has been. These three windings 12a, 12b, and 12c are stacked in order and attached to the outer periphery of a core portion 17 (to be described later) of the coil bobbin 13. The number of windings and the number of windings differ depending on the type of transformer.

  The coil bobbin 13 includes a first bobbin half 13a and a second bobbin half 13b.

  The first bobbin half 13a is formed by molding a resinous material, has a rectangular shape in plan view, and is provided with a core middle leg insertion hole 15a penetrating vertically in the center part. And the four core pieces 17a projecting perpendicularly upward from the upper surface of the terminal block 16a along the peripheral surface of the core middle leg insertion hole 15a are integrally formed. .

  In addition, as shown in FIG. 6, the four core pieces 17a in the first bobbin half 13a are spaced by about 90 degrees along the peripheral surface of the core middle leg insertion hole 15a in this example, and about 45 It is formed with a width of degrees. Also, as shown in FIG. 6, the left and right side surfaces 18a, 18a of each core piece 17a are inclined surfaces provided so that the width of the core piece 17a gradually increases from the inner periphery toward the outer periphery. Is formed.

  Further, at the time of molding the first bobbin half 13a, two terminals 19 having a substantially U-shape in side view are placed at appropriate intervals on a pair of opposing edges of the terminal block 16a. It is inserted and provided. Each terminal 19 is fixed so that the upper end portion 19a extends obliquely upward and outward from the upper surface of the terminal block portion 16a, and the lower end portion 19b extends horizontally outward from the lower surface of the terminal block 16a. Yes.

  Further, when the first bobbin half 13a is molded, a core housing recess 20 communicating with the core middle leg insertion hole 15a is formed on the lower surface side of the terminal block 16a. In addition, a pair of core outer leg insertion holes 15b, 15b formed in parallel at appropriate intervals on the left and right sides sandwiching the core middle leg insertion hole 15a are respectively provided from the inside of the core housing recess 20 to the terminal block. The upper surface of the portion 16a is provided so as to penetrate vertically.

  The second bobbin half 13b is formed by molding a resinous material, and has an upper flange portion 16b having a square shape in plan view, which is provided with a core middle leg insertion hole 21a penetrating vertically at the center portion, Four core pieces 17b projecting at right angles toward the lower surface of the upper flange 16b along the peripheral surface of the core middle leg insertion hole 21a of the upper flange 16b are integrally formed.

  In addition, as shown in FIG. 6, the four core pieces 17b in the second bobbin half 13b are alternately arranged with the core pieces 17a in the first bobbin half 13a and side surfaces 18a, 18b. The core middle leg insertion hole 21a is made to correspond to the core piece 17a in the first bobbin half 13a so that they can be in close contact with each other and slidably assembled in the vertical direction (the buttock direction). It is formed at intervals of about 90 degrees along the inner circumference and with a width of about 45 degrees. Further, when the second bobbin half 13b is combined with the first bobbin half 13a, both side surfaces 18b, 18b of each core piece 17b are also shown in FIG. 6 as the core piece 17a in the first bobbin half 13a. The left and right side surfaces 18b, 18b of each core piece 17b are also provided so that the width of the core piece 17a gradually decreases from the inner periphery to the outer periphery so that the left and right side surfaces 18a, 18a are in close contact with each other. It is formed as an inclined surface.

  The first bobbin half 13a and the second bobbin half 13b are formed by alternately combining the core pieces 17a and 17b, as shown in FIG. 5A. When the second bobbin half 13b is assembled from above, the left and right side surfaces 18a of the core piece 17a in the first bobbin half 13a and the left and right side surfaces of the core piece 17b in the second bobbin half 13b 18b are incorporated while rubbing each other to form a cylindrical core portion 17 by the core piece 17a and the core piece 17b, and a terminal base portion as a lower flange portion above and below the core portion 17, respectively. The coil bobbin 13 in which the 16a and the upper flange portion 16b are arranged is configured. In addition, by providing the inclined surfaces on both side surfaces 18a and 18b, the areas that rub against each other are widened, and stress in the pushing back direction can be prevented.

  Note that the number of core pieces 17a and 17b provided in the first bobbin half 13a and the second bobbin half 13b may be any number as long as it is two or more. Further, when the first bobbin half 13a and the second bobbin half 13b are combined, even if all the four core pieces 17a and 17b are not rubbed together, it is sufficient that at least one is rubbed.

  The coil bobbin 13 configured as described above has three windings 12a, 12b, and 12c stacked in order on the terminal block 16a when the first bobbin half 13a and the second bobbin half 13b are combined. The coil 12 is mounted and arranged on the outer periphery of the winding core portion 17, and the upper and lower sides of the coil 12 are sandwiched between the lower flange portion (terminal base portion 16a) and the upper flange portion 16b as shown in FIG. 5B. . In this case, since the coil bobbin 13 formed by combining the first bobbin half 13a and the second bobbin half 13b can slide in the vertical direction, the height of the core portion 17 can be freely adjusted. Thus, the coil 12 can be pressed and pressurized, and by bringing the three windings 12a, 12b and 12c into close contact with each other, the coupling can be increased and the conversion efficiency can be improved. The winding start portions and winding end portions of the windings 12a, 12b, and 12c attached to the winding core portion 17 are fixed to the terminal portion 19 with solder or the like.

  The core 14 has a cylindrical middle leg portion 22a and a pair of outer leg portions 22b and 22b provided in parallel at appropriate intervals on both sides of the middle leg portion 22a. A pair of core halves (commonly referred to as “ER cores”) 14a and 14b formed in a shape.

  The lower core half 14a is inserted into the core accommodating recess 20 from the lower side of the terminal block 16a with the columnar middle leg 22a and outer legs 22b, 22b facing upward. Is attached to the terminal block 16a. When the core half 14a is inserted into the core housing recess 20, as shown in FIG. 4, the middle leg 22a is inserted into the core middle leg insertion hole 15a, and the outer legs 22b and 22b are the core outer legs. It is inserted into the insertion holes 15b, 15b.

  On the other hand, the upper core half body 14b faces the upper half of the lower core half body 14a with the columnar middle leg portion 22a and the outer leg portions 22b and 22b facing downward. Then, the middle leg portion 22a is inserted into the core middle leg insertion hole 21a to abut against the middle leg portion 22a of the lower core half body 14a, and the outer leg portions 22b and 22b are joined to the outer legs of the lower core half body 14a. The parts 22b and 22b are arranged to face each other.

  As a result, the core half body 14 a and the core half body 14 b have the middle leg portions 22 a and 22 a butted together in the core portion 17, and at the same time, the outer leg portions 22 b and 22 b are outside the core portion 17. And a core 14 is formed which surrounds the inner and outer circumferences of the mounted coil 12. When the core half body 14a and the core half body 14b are butted together, the butted surfaces of the middle leg portion 22a and the outer leg portions 22b and 22b of the lower core half body 14a and the upper core half body 14b are bonded and fixed. The

  As described above, according to the transformer 11 according to the present embodiment, when the first bobbin half 13a and the second bobbin half 13b are slid inward from each other, the lower flange portion (terminal base portion) The distance between 16a) and the upper flange part 16b changes, and the height dimension of the cylindrical core part 17 can be freely changed. Therefore, even if the number of turns of the winding and the creeping distance are different, the coil 12 composed of the three windings 12a, 12b, and 12c attached to the winding core portion 17 is connected to the lower flange (terminal block portion 16a) and the upper flange. It is possible to press up and pressurize with the portion 16b, and to keep close contact with the windings 12a, 12b, and 12c to improve the coupling. As a result, a single type of coil bobbin can cope with a plurality of types of transformers having different numbers of turns of windings and creepage distances. In addition, a large adjustment amount can be secured.

  In the above example, the pair of ER type cores 14a and 14b are abutted together, but the present invention can be applied to any of EE type, EI type, pot core, UU type, and the like.

  In the above example, the first bobbin half 13a and the second bobbin half 13b are formed by molding synthetic resin or the like. However, the first bobbin half 13a and the second bobbin half are formed. One of 13b may be formed with resin with high hardness, and the other may be formed with resin with low hardness. As an example, the first bobbin half 13a having the terminal block 16a is formed of a thermosetting resin, and the second bobbin half 13b is formed of a thermoplastic resin.

  When formed in this way, when both side surfaces 18a of the core pieces 17a in the first bobbin half body 13a and the both side surfaces 18b of the core piece 17b in the second bobbin half body 13b rub against each other by the slide, Indentation adjustment between the core pieces 17a and 17b by rubbing the surface (18b or 18a) of the core piece (17b or 17a) with low hardness against the surface (18a or 18b) of the high core piece (17a or 17b) The action of a stopper that suppresses the returned bobbin halves 13a and 13b from returning to the direction before the push-in works, and the pushed-in bobbin halves 13a and 13b can be held at that position. Thereby, it becomes possible to continue maintaining the optimal coupling state of the coil 12.

  Further, even if the both side surfaces 18a of the core piece 17a and the both side surfaces 18b of the core piece 17b do not rub against each other, the first bobbin half 13a provided with the terminals 19 is molded with a thermosetting resin. As a result, it is possible to withstand the heat generated during soldering work, welding work, etc. between each terminal 19 and each terminal of the windings 12a, 12b, 12c.

  Furthermore, in the above example, the coil bobbin shape is shown in which the core portion 17 is perpendicular to the terminal block portion 16a. However, the core portion 17 is disposed horizontally, and the ends of the core portion 17 are arranged at both ends. Each may have a coil bobbin shape in which a terminal block also serving as a collar is disposed.

  Further, as shown in FIG. 7, on both side surfaces 18a, 18a of the core piece 17a in the first bobbin half 13a and the both side surfaces 18b, 18b of the core piece 17b in the second bobbin half 13b, which are alternately combined, It is also possible to provide serrated teeth 25a, 25b composed of the horizontal tooth surface 24a and the inclined tooth surface 24b so as to be able to mesh with each other. In this structure, when the two bobbin halves 13a and 13b are pushed into each other, they can slide relatively smoothly with the saw-tooth teeth 25a and 25b, but when they are pulled out, the saw-tooth teeth 25a and 25b The bobbin halves 13a and 13b that have been pushed in are engaged with each other and serve as a stopper function to prevent the bobbins half 13a and 13b from being slid and returned to the direction before pushing.

  Therefore, in the case where such a stopper function is provided between the first bobbin half 13a and the second bobbin half 13b, the bobbin halves 13a and 13b are slid inwardly to each other between the collars ( Once the coil 12 is pressed once (between the terminal block 16a and the upper flange 16b), the bobbin halves 13a and 13b are prevented from returning to each other by the action of the stopper function. Since it can hold | maintain, the optimal coupling | bonding state of the coil 12 can be maintained.

  When the first bobbin half 13a is a thermosetting resin and the second bobbin half is a thermoplastic resin, the saw-tooth teeth 25a and 25b are equal to the number N1 of the saw-tooth teeth 25b of the second bobbin. In comparison, by reducing the number N2 of the first sawtooth teeth 25a, that is, (N1> N2), it is possible to improve durability due to wear of the sawtooth teeth 25a and 25b.

  Further, in the modification shown in FIG. 7, the structure in which the saw-tooth teeth 25a and 25b are provided on all the both side surfaces 18a and 18b of the core pieces 17a and 17b is disclosed, but part or all of the core pieces 17a and 17b are disclosed. Of the core pieces 17a and 17b, the bobbin halves may be formed by combining a core piece provided with serrated teeth and a core piece not provided with serrated teeth.

  FIG. 8 shows one modified example, that is, a further modified example of FIG. The winding core pieces 17a and 17b in FIG. 8 are provided with serrated teeth 25a and 25b on one side surface 18a and 18b (indicated by an arrow A in the figure), and each other side surface 18a and 18b (in the figure, arrow B in the figure). (Shown in Fig. 1) is formed in a structure without saw-tooth teeth. Further, on the side where the saw-tooth teeth 25a and 25b are provided, the saw-tooth teeth 25b are provided in almost the entire range of the side surface 18b on the side of the core piece 17b (range from the distal end portion to the base end portion). The side surface 18a is formed as a structure in which saw-tooth teeth 25a are provided from the front end portion to the middle of the base end portion, and a notch 26 is provided between the saw-tooth teeth 25a and the base end portion.

  Further, as shown in FIGS. 7 and 8, when the saw-tooth teeth 25a and 25b are provided on the winding core pieces 17a and 17b, it is easy to form a molding die at the time of molding. As shown in the drawing, the cracking positions of the four core pieces 17a and the four core pieces 17b may be formed so as to be vertical at the position indicated by the arrow C in the figure and horizontal at the position indicated by the arrow D in the figure. As a result, when the bobbin halves 13a and 13b are resin-molded, the molding dies can be split so that they can be molded by moving in the horizontal direction and the vertical direction, respectively, and the structure of the molding die apparatus is simplified. be able to.

  Further, as shown in FIG. 9, the core pieces 17a, 17a arranged at the horizontal position indicated by the arrow D in the figure are larger than the width dimension W1 of the core pieces 17a, 17a arranged at the vertical position indicated by the arrow C in the figure. When the width dimension W2 is increased, that is, when the width dimension is changed so as to satisfy (W1 <W2), the second bobbin half 13b is shifted by 90 ° with respect to the first bobbin half 13a. Even if you try to assemble, you can not assemble, so you can eliminate assembly mistakes. This can be similarly applied to a coil bobbin in which the saw-tooth teeth 25a and 25b are not provided on the winding core pieces 17a and 17b. In addition, FIG. 9 is the figure which looked at the coil bobbin 13 in the horizontal cross section in the state which has not mounted | wore with the coil.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements other than those described above can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  In the above embodiment, the coil bobbin is applied to a transformer. However, the coil bobbin can be applied to a winding component such as an inductor in addition to the transformer.

11 Transformer 12 Coil 12a Primary winding 12b Secondary winding 13 Coil bobbin 13a First bobbin half 13b Second bobbin half 14 Core 14a, 14b Core half 15a Core middle leg insertion hole 15b Core outer leg insertion hole 16a Terminal block (lower side)
16b Upper flange part 17 Winding part 17a Winding piece 17b Winding piece 18a Both side faces 18b Both side faces 19 Terminal 19a Upper end part 19b Lower end part 20 Core receiving recess 21a Core middle leg insertion hole 22a Middle leg part 22b Outer leg part 24a Horizontal teeth Surface 24b Inclined tooth surface 25a Serrated tooth 26 Notch

Claims (4)

In the coil bobbin that mounts the coil on the outer periphery of the core part,
A first bobbin half and a second bobbin half;
Each bobbin body is integrally provided with a flange and at least two core pieces projecting perpendicularly from the flange, and each core piece is alternately arranged between the two bobbin halves and in a direction in which the flanges approach each other. Built in a slidable manner to form a cylindrical core,
The core pieces are formed with saw-tooth teeth that mesh with each other at the core pieces of the bobbin halves, and these saw-tooth teeth slide in a direction away from the position where the collar portions are slid in the direction of approaching each other. And has a stopper function to stop returning,
The two bobbin halves are formed of materials having different hardnesses, one bobbin half is made of a thermosetting resin, and the other bobbin body is made of a thermoplastic resin.
The coil bobbin is characterized in that the sawtooth is formed so that the number N2 of sawtooth teeth of the one bobbin half is smaller than the number N1 of sawtooth teeth of the other bobbin half. . The width of the core pieces of each bobbin body is formed so that at least one of the core pieces is wider than the other width so that the bobbin bodies cannot be assembled to each other except at a predetermined position. co-Irubobin described. The winding direction of the crack surface of the core piece, co Irubobin according to claim 1 or claim 2, characterized by being formed in the vertical or horizontal direction. Transformer characterized by using a coil bobbin according to claim 1 or we claim 3.

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