JP2007281190A - Wiring apparatus and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a wiring apparatus for transformers, reactors, or coils etc. small-size, light-weight, high withstand voltage, and low cost. <P>SOLUTION: The wiring apparatus comprises a first bobbin 31 having a cavity 31d and including a high tension wiring 21 wound around the outside thereof, a second bobbin 32 assembled surrounding the first bobbin 31 and including a low tension wiring 22 wound around the outside thereof, and a pair of E-shaped cores 11, 12 mounted in the cavity 31d of the first bobbin 31 and outside the second bobbin 32 to form a closed magnetic path. The second bobbin 32 comprises a case 33 having a bottom wall 33f, and a pair of side walls 33a extending vertically upwardly from both sides of the bottom wall 33f; and a cover 34 having a top wall 34e, and a pair of side walls 34a extending vertically downwardly from both sides of the top wall 34e. The first bobbin 31 is disposed within a space of the second bobbin 32 formed with the pair of the side walls 34a of the cover 34, with the top wall 34e of the cover 34, and with the bottom wall 33f of the case 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a winding device suitable for a winding device such as a transformer, a reactor or a coil, particularly a small high-frequency transformer having a high voltage winding used in a lighting device such as a cold cathode fluorescent discharge tube (CCFL), and the like. It relates to the assembly method.

  In recent years, cold cathode fluorescent discharge tubes are often used in display devices such as notebook personal computers and liquid crystal televisions due to the promotion of power saving in electronic devices and the like. In particular, recently, with the enlargement of the screen of a liquid crystal television, a cold cathode fluorescent discharge tube having a length exceeding 1 m is required, so that the output voltage of the transformer used for the inverter circuit for lighting the cold cathode fluorescent discharge tube becomes higher. There is a tendency. In addition, the number of cold cathode fluorescent discharge tubes used tends to increase in order to reduce luminance unevenness and increase screen brightness for a single liquid crystal display. With the increase in the number of cold cathode fluorescent discharge tubes used, the number of transformers used in the inverter circuit for lighting also increases, so there is a strong demand for reduced transformer manufacturing costs, small size, light weight, and high withstand voltage. Yes.

  FIG. 7 shows an example of an inner iron type transformer as a conventional winding device used in an inverter circuit for lighting a cold cathode fluorescent discharge tube. This transformer is composed of a U-shaped core (13) and an I-shaped core (14) that form an annular closed magnetic path facing each other, and a secondary high-voltage winding (21) as a first winding. A first bobbin (31) mounted on one leg (13a) of the U-shaped core (13) and a primary low-voltage winding (22) as a second winding are wound. A second bobbin (32) mounted on the other leg (13b) of the U-shaped core (13), and for insulation surrounding the first bobbin (31) and the second bobbin (32) A cover (41). The first bobbin (31) is provided at a cylindrical portion (31a) that forms a cavity (31d) into which one leg (13a) of the U-shaped core (13) is inserted, and at both ends of the cylindrical portion (31a). And a plurality of flanges (31c) provided between the respective fitting grooves (31b), and a high-pressure winding is provided between each of the plurality of flanges (31c). The line (21) is divided and wound. The second bobbin (32) is provided at a cylindrical part (32a) that forms a cavity (32d) into which the other leg part (13b) of the U-shaped core (13) is inserted, and at both ends of the cylindrical part (32a). The fitting groove (32b) and a flange (32c) provided between the fitting grooves (32b), and the low voltage winding (22) is wound between the flanges (32c). The insulating cover (41) includes a cover main body (41a) surrounding the outer periphery of the first bobbin (31) and the second bobbin (32), an inner surface of the cover main body (41a), and the first and second bobbins (41a). Projections (41b) that fit into the fitting grooves (31b, 32b) of the two bobbins (31, 32), and the first and second bobbins (31, 32) provided on the cover body (41a). There are two pairs of holes (41c) connected to each cavity (31d, 32d).

  In the transformer shown in FIG. 7, a high voltage winding (21) wound around the first bobbin (31) and a low voltage winding (22) wound around the second bobbin (32) Separation via the core (13) improves the dielectric strength between the high-voltage winding (21) and the low-voltage winding (22), but the outer size increases and the insulation cover (41) There was a drawback that the outer shape was enlarged by that amount. Further, since the low voltage winding (22) and the high voltage winding (21) are separated from each other, the U-shaped core (13) and the I type of the magnetic flux generated in the primary low voltage winding (22). One magnetic flux flowing through the annular closed magnetic circuit formed by the core (14) is linked to the secondary high-voltage winding (21), but is released from the low-voltage winding (22) into the space. This magnetic flux becomes a leakage magnetic flux not interlinked with the high-voltage winding (21). Therefore, a loss of magnetic energy occurs between the primary side low voltage winding (22) and the secondary side high voltage winding (21), and the conversion efficiency of the inverter circuit is reduced. There is a problem of adversely affecting the surrounding electronic components. In other words, heat generated by eddy currents or power loss occurs in the conductor around the transformer, and if an electronic circuit or the like is present, it may cause a malfunction. The magnetic fluxes interfere with each other, causing malfunctions in the inverter circuit.

  In order to reduce the leakage magnetic flux by bringing the windings close to each other, for example, it is conceivable to use a transformer having a structure shown in FIG. That is, the transformer shown in FIG. 8 surrounds the first bobbin (31) wound with the secondary high-voltage winding (21), the first bobbin (31), and the high-voltage winding (21). Then, the second bobbin (32) around which the primary side low-voltage winding (22) is wound, the pair of side legs (11a, 11b; 12a, 12b) and the first and second bobbins (31 , 32) and a pair of E-shaped cores (11, 12) that form an annular closed magnetic path opposite to each other and having middle leg portions (11c, 12c). The first bobbin (31) includes a cylindrical portion (31a) that forms a cavity (31d) into which the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12) are inserted, and a cylindrical portion (31a) And 5 flanges (31c) provided between both end portions (31f), and the high voltage winding (21) is divided into 6 parts between each end portion (31f) and 5 flanges (31c). Be dressed. The second bobbin (32) has a cylindrical part (32a) forming a cavity (32d) surrounding the first bobbin (31) and the high-voltage winding (21), and both ends of the cylindrical part (32a). A pair of flanges (32c) provided, and the low-voltage winding (22) is wound between the pair of flanges (32c). A transformer having a configuration similar to that of FIG. 8 is disclosed, for example, in Patent Document 1 below.

JP 2001-250728 A (Page 3, FIG. 1)

  In the transformer shown in FIG. 8, the high voltage winding (21) and the low voltage winding (22) are coaxially wound around the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12). Because the coil for winding (21) and the coil for low voltage (22) are close to each other, most of the magnetic flux generated in the coil for low voltage on the primary side (22) is formed by a pair of E-shaped cores (11, 12). It is possible to reduce the generation of leakage magnetic flux by flowing in the annular closed magnetic circuit and effectively interlinking with the secondary high-voltage winding (21).

  Further, in the transformer shown in FIG. 8, the secondary side high-voltage winding (21) is wound on the side (inner side) near the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12), Depending on various conditions, whether it is wound on the side (outside) far from the middle leg (11c, 12c), or both ends of each winding (21, 22) are pulled out in the same direction or in both directions However, the first bobbin (31) for high pressure and the second bobbin (32) for low pressure cannot be provided with fitting parts as shown in FIG. 7, and each has the following problems. It was unsuitable as a small, high withstand voltage and low cost transformer.

  Wind the high-voltage winding (21) around the middle leg (11c, 12c) side (inside) of the pair of E-shaped cores (11,12) and pull out both ends of each winding (21,22) in the same direction The high-voltage winding (21), the high-voltage winding (21) and both ends of the high-voltage winding (21) and the E-shaped core (11, 12) and the high-voltage winding (21) and the low-voltage winding (22 ) And the low-voltage winding (22), it is difficult to secure an insulation distance and a creepage distance between both ends, and there is a problem that the size cannot be reduced. Further, in order to pull out both ends of each winding (21, 22) in the same direction, it is necessary to pull out both ends of each winding (21, 22) in the direction of starting winding. For this reason, the distance between the start and end of winding of the high-voltage winding (21) is close, so the stray capacitance between the terminals of the high-voltage winding (21) increases, and the withstand voltage between the terminals is stably secured. There is a problem that it is difficult to perform the disconnection, and the lead wires of the windings (21, 22) become long, so that they are easily disconnected.

  When winding the high-voltage winding (21) around the middle leg (11c, 12c) side (inside) of the pair of E-shaped cores (11,12) and pulling out both ends of each winding (21,22) in both directions It is possible to easily secure the withstand voltage between the terminals of the high voltage winding (21), but between the both ends of the high voltage winding (21) and the E-shaped core (11, 12) and the high voltage winding (21). It is difficult to secure an insulation distance and a creepage distance between both ends of the low voltage winding and both ends of the low voltage winding (22).

  Wind the high-voltage winding (21) on the far side (outside) from the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12), and place both ends of each winding (21, 22) in the same direction In the case of pulling out the cover, by covering the cover, an insulation distance and a creepage distance between both ends of the high voltage winding (21) and the E-shaped core (11, 12) can be secured. ) And both ends of the low-voltage winding (22), it is difficult to secure an insulation distance and a creepage distance, and there is a problem that the size cannot be reduced. Also, since both ends of each winding (21, 22) are pulled out in the same direction, the number of work steps increases, making it difficult to stably secure the withstand voltage between the terminals of the high voltage winding (21). There is a problem that the lead lines of the lines (21, 22) are easily disconnected.

  The high voltage winding (21) is wound on the side (outside) far from the middle leg (11c, 12c) of the pair of E-shaped cores (11, 12), and both ends of each winding (21, 22) are bidirectional. When pulling out, by covering the cover, the insulation distance and creepage distance between both ends of the high voltage winding (21) and the E-shaped core (11, 12) can be secured, but the high voltage winding (21) It is difficult to secure an insulation distance and a creepage distance between both ends of the wire and both ends of the low-voltage winding (22), and there is a problem that the size cannot be reduced.

  As described above, in the conventional transformer shown in FIGS. 7 and 8, the insulation distance and creepage distance between the secondary high voltage winding (21) and the primary low voltage winding (22) are reduced. It has been difficult to reduce the size, weight, and withstand voltage while ensuring sufficient. Further, in order to increase the withstand voltage, a separate insulating cover (41) is required, so that there is a disadvantage that the cost of parts becomes high and the assembly process becomes complicated.

  Accordingly, the present invention provides a winding device such as a transformer, a reactor, or a coil, and an assembling method thereof, which can be easily reduced in size, weight, and withstand voltage, can reduce component costs, and can simplify an assembling process. With the goal.

  The winding device according to the present invention surrounds a first bobbin (31) having a cavity (31d) and winding a first winding (21) on the outside, and the first bobbin (31). A second bobbin (32) assembled and wound around the second winding (22), and inside the cavity (31d) of the first bobbin (31) and outside the second bobbin (32) And cores (11, 12) that are attached to form a closed magnetic circuit. The second bobbin (32) includes a case (33) having a bottom wall (33f), a cover (34) having a top wall (34e), and a vertically upper side from both sides of the bottom wall (33f) of the case (33). Or at least a pair of side walls (33a, 34a) extending vertically downward from both sides of the top wall (34e) of the cover (34), and at least a pair of side walls (33a, 34a) and a case The first bobbin (31) is disposed in the space of the second bobbin (32) formed by the bottom wall (33f) of (33) and the top wall (34e) of the cover (34). The pair of side walls (33a, 34a) provided on at least one of the case (33) and the cover (34), the bottom wall (33f) of the case (33), and the top wall (34e) of the cover (34) are small. In the outer shape, the insulation distance and creepage distance between the first winding (21) and the second winding (22) are sufficiently secured, and the first and second windings (21, 22) are separated. By making them approach, the leakage magnetic flux between the windings (21, 22) can be reduced. For this reason, it is possible to easily obtain a small, lightweight and high withstand voltage winding device. Furthermore, the recesses (31b) or protrusions provided on both ends (31f) of the first bobbin (31) and the protrusions (34g, 33b) provided on the inner surfaces of the covers (34) or the case (33) ( 34b, 33h) or the recesses are fitted to each other, so that the creepage distance between the high voltage winding (21) and the low voltage winding (22) is further extended. Can be miniaturized.

  Also, in the method of assembling the winding device according to the present invention, the first winding (21) is wound around the first bobbin (31), and both ends of the first winding (21) are connected to the first bobbin. A case (33) having a step of pulling out from (31), a case (33) having a bottom wall (33f), and a cover (34) having a top wall (34e), and perpendicular to both sides of the bottom wall (33f) of the case (33) At least a pair of side walls (33a, 34a) extending upward or vertically downward from both sides of the top wall (34e) of the cover (34), a bottom wall (33f) of the case (33), and a cover The step of arranging the first bobbin (31) in the space of the second bobbin (32) formed by the top wall (34e) of (34) and the case (33) and the cover (34) are combined. A step of assembling the second bobbin (32), a step of pulling out both ends of the first winding (21) from the second bobbin (32), and a second bobbin (32) on the outer surface of the second bobbin (32). The step of winding the winding (22) and pulling out both ends of the second winding (22) from the second bobbin (32) And a step of mounting the core (11, 12) in the assembly of the second bobbins second winding (22) wound (32). A second wall formed by the pair of side walls (33a, 34a) of the case (33) or the cover (34), the bottom wall (33f) of the case (33), and the top wall (34e) of the cover (34). Since the first bobbin (31) is arranged in the space of the bobbin (32) and the second bobbin (32) is assembled by combining the case (33) and the cover (34), an insulating member is separately prepared. This eliminates the need to improve the withstand voltage, reduce the component cost, and simplify the assembly process.

  According to the present invention, the pair of side walls provided on at least one of the case and the cover of the second bobbin that surrounds the first bobbin, the bottom wall of the case, and the top wall of the cover allow the first outer shape to be small. A small, lightweight, high withstand voltage winding that reduces the leakage magnetic flux between the first and second windings while ensuring a sufficient insulation distance and creepage distance between the winding and the second winding. A wire device can be obtained easily. Further, the first bobbin is disposed in the space of the second bobbin formed by the pair of side walls of the case or the cover, the bottom wall of the case, and the top wall of the cover, and the case and the cover are combined to form the first bobbin. Since the two bobbins are assembled, it is not necessary to prepare an insulating member separately, the dielectric strength can be improved with a small number of parts, and the parts cost can be reduced and the assembling process can be simplified. Further, when the secondary high voltage winding is wound around the inner first bobbin and the primary low voltage winding is wound around the second outer bobbin, the primary low voltage winding is used. Since the leakage magnetic flux and noise to the outside of the winding device can be reduced by the shielding (shielding) effect, a shield plate or the like is unnecessary, and the influence on the electronic circuit around the winding device can be minimized.

  Hereinafter, an embodiment in which a winding device according to the present invention is applied to a transformer for high voltage will be described with reference to FIGS. However, in FIG. 1 to FIG. 6, parts that are substantially the same as those shown in FIG. 7 and FIG.

  As shown in FIGS. 1 to 3, the transformer of the present embodiment includes a first bobbin (31) having a cavity (31d) and winding a high-voltage winding (21) on the outside, A second bobbin (32) which is assembled so as to surround the bobbin (31) and which is wound with a low-voltage winding (22) on the outside, and the second bobbin (31) in the cavity (31d) and the second bobbin (31) And a pair of E-shaped cores (11, 12) as cores that are mounted outside the bobbin (32) to form a closed magnetic circuit. The first bobbin (31) includes a cylindrical portion (31a) that forms a cavity (31d) into which the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12) are inserted, and a cylindrical portion (31a) Fitting grooves (31b) provided at both ends (31f) of the cylinder, nine flanges (31c) provided between both ends (31f) of the cylinder (31a), and both ends of the cylinder (31a) A terminal attachment portion (31e) formed so as to protrude from a part of (31f) and to which the high-voltage side terminal (23) is inserted. Between each of the end portions (31f) and the nine flanges (31c), a high-voltage winding (21) is wound in 10 parts, and these high-voltage windings (21) are wound in series. The Both end portions (not shown) of the high-voltage winding (21) are drawn out to the terminal mounting portions (31e) at both ends of the first bobbin (31), and are electrically connected to the high-voltage side terminal (23) by soldering or welding. Connected to.

  The second bobbin (32) includes a case (33) having a bottom wall (33f) having a convex cross-sectional shape and a pair of side walls (33a) extending vertically upward from both sides of the bottom wall (33f), and a top wall (34e) and a cover (34) having a pair of side walls (34a) extending vertically downward from both sides of the top wall (34e). The case (33) includes three flanges (33c) provided along the outer peripheral surface between the pair of side walls (33a) and both ends (33b) of the bottom wall (33f), and both ends of the pair of side walls (33a). Of the first bobbin (31) provided on the bottom wall of the terminal mounting portion (33e) and the terminal mounting portion (33e) formed by protruding from the portion (33b) and having the low voltage terminal (24) inserted therein A terminal insertion hole (33g) for inserting the high voltage side terminal (23), and a protrusion (33h) provided at both ends of the bottom wall (33f) and fitted in the fitting groove (31b) of the first bobbin (31) ). The cover (34) is provided on the outer surface between both ends (34g) of the top wall (34e) and has three flanges (34c) coupled to each flange (33c) of the case (33), and both ends (34g) And a hole portion (34d) connected to both end portions (31f) of the cylindrical portion (31a) of the first bobbin (31), and a terminal of the case (33) formed to project from both end portions (34g) The overhanging portion (34f) coupled to the mounting portion (33e), and the fitting of the first bobbin (31) provided on the inner surfaces of both ends (34g) of the pair of side walls (34a) and the top wall (34e) And a protrusion (34b) fitted into the groove (31b). As shown in FIG. 2, the first bobbin (31) is disposed between the pair of side walls (34a) of the cover (34), and the fitting groove (31b) of the first bobbin (31) and the case (33) are arranged. ) And the projections (33h, 34b) of the cover (34) are fitted, and the assembly of the first bobbin (31) and the cover (34) is disposed between the pair of side walls (33a) of the case (33). Thus, an assembly of the second bobbin (32) is formed. Between the two ends (33b, 34g) of the case (33) and the cover (34) and the three flanges (33c, 34c) constituting the assembly of the second bobbin (32), there is a low-pressure winding. A wire (22) is wound. Both ends (not shown) of the low-voltage winding (22) are drawn out to the terminal mounting portions (33e) at both ends of the case (33), and are electrically connected to the low-voltage side terminal (24) by soldering or welding. The As shown in FIG. 3, the middle legs (11c, 12c) of the pair of E-shaped cores (11, 12) are inserted through the holes (34d) of the cover (34) of the second bobbin (32). It is inserted into the cavity (31d) of the cylindrical part (31a) of one bobbin (31). On the winding surface of the low voltage winding (22) of the bottom wall (33f) constituting the case (33) of the second bobbin (32), there are protrusions protruding from both ends of the flat cover body (41a). An insulating cover (41) having (41d) is attached.

  When assembling the transformer of the present embodiment, the high-voltage winding (21) is divided into 10 parts between the both ends (31f) and the nine flanges (31c) of the first bobbin (31), and these high voltage Winding wire (21) is wound in series. Subsequently, both end portions (not shown) of the high-voltage winding (21) are pulled out from the terminal mounting portion (31e) of the first bobbin (31) and electrically connected to the high-voltage side terminal (23) by soldering or welding. Connect to. Next, the first bobbin (31) around which the high voltage winding (21) is wound is disposed between the pair of side walls (34a) of the cover (34), and the fitting groove of the first bobbin (31) is arranged. (31b) and the projection (34b) of the cover (34) are fitted together to form an assembly of the first bobbin (31) and the cover (34). Further, the assembly of the first bobbin (31) and the cover (34) is disposed between the pair of side walls (33a) of the case (33), and the fitting groove (31b) of the first bobbin (31) By fitting the protrusion (33h) of the case (33), the pair of side walls (34a) of the cover (34), the bottom wall (33f) of the case (33), and the top wall of the cover (34) ( 34e), the first bobbin (31) is disposed in the space of the second bobbin (32) formed by the combination of the case (33) and the cover (34) to mount the second bobbin (32). assemble. At the same time, the high-voltage side terminal (23) of the first bobbin (31) is inserted into the terminal insertion hole (33g) of the case (33), and the high-voltage side terminal (23) is pulled out from the second bobbin (32). Thereafter, the low-voltage winding (22) between each of the end portions (33b, 34g) of the case (33) and the cover (34) and the three flanges (33c, 34c) constituting the second bobbin (32). ). At the same time, both ends (not shown) of the low-voltage winding (22) are pulled out from the terminal mounting portions (33e) at both ends of the case (33) and electrically connected to the low-voltage side terminal (24) by soldering or welding. Connecting. Finally, a pair is inserted into the cavity (31d) of the cylindrical portion (31a) of the first bobbin (31) through the hole (34d) of the cover (34) constituting the assembly of the second bobbin (32). A pair of E-shaped cores is assembled to the assembly of the second bobbin (32) in which the middle legs (11c, 12c) of the E-shaped core (11, 12) are inserted and the low-voltage winding (22) is wound. Wear (11,12). Further, as shown in FIGS. 1 and 3, an insulating cover (41) is provided on the outer peripheral surface of the low voltage winding (22) of the bottom wall (33f) constituting the case (33) of the second bobbin (32). May be installed to improve the withstand voltage between the low-voltage winding (22) and the mounting surface.

  In the present embodiment, the pair of side walls (34a) of the cover (34) of the second bobbin (32) surrounding the first bobbin (31), the bottom wall (33f) of the case (33), and the cover The top wall (34e) of (34) ensures a sufficient insulation distance and creepage distance between the secondary high-voltage winding (21) and the primary low-voltage winding (22) even with a small outer shape. However, the magnetic flux leakage between the windings (21, 22) can be reduced by bringing the high-voltage winding (21) and the low-voltage winding (22) close to each other. For this reason, a small, lightweight, and high withstand voltage transformer can be easily obtained. Also, fitting grooves (31b) are provided at both end portions (31f) of the first bobbin (31), and protrusions (33h, 34b) fitting into the fitting grooves (31b) are provided on the bottom wall of the case (33). (33f) and the inner surface of both ends (34g) of the cover (34), the fitting groove (31b) of the first bobbin (31) and the protrusions (33h, 34b) can be fitted to each other to further extend the creepage distance between the high-voltage winding (21) and the low-voltage winding (22), thereby further reducing the size of the high withstand voltage transformer. It becomes possible. In addition, since the low-voltage winding (22) is wound outside the high-voltage winding (21), the magnetic flux leakage and noise outside the transformer are reduced by the shielding effect of the low-voltage winding (22). Thus, the influence on peripheral electronic circuits and the like can be minimized. Further, the second bobbin (32) formed by the pair of side walls (34a) of the cover (34), the bottom wall (33f) of the case (33), and the top wall (34e) of the cover (34). The first bobbin (31) is necessary and sufficient by arranging the first bobbin (31) in the space and assembling the second bobbin (32) by combining the case (33) and the cover (34). Since it is surrounded by the second bobbin (32) with an insulation distance, it is not necessary to prepare a separate insulation cover (41) unlike the conventional transformer shown in FIG. Can be reduced and the assembly process can be simplified.

  Embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made. For example, in the above embodiment, the first bobbin (31) is mounted between the pair of side walls (34a) of the cover (34), and the assembly of the first bobbin (31) and the cover (34) is assembled. The assembly of the first bobbin (31) and the cover (34) is mounted between the pair of side walls (33a) of the case (33) to assemble the second bobbin (32). As shown in FIG. 6, the first bobbin (31) is mounted between the pair of side walls (33a) of the case (33) to form an assembly of the first bobbin (31) and the case (33). The assembly of the first bobbin (31) and the case (33) may be mounted between the pair of side walls (34a) of the cover (34) to assemble the second bobbin (32). In this case, as shown in FIG. 5, the pair of side walls (33a) of the case (33) is disposed between the first bobbin (31) and the pair of side walls (34a) of the cover (34). The outer surface of the pair of side walls (33a) of the case (33) is formed flat, and the first bobbin (31) is formed on the inner surface and the bottom wall (33f) of both ends (33b) of the pair of side walls (33a). Protrusions (33h) that fit into the fitting grooves (31b) are provided, the inner surfaces of the pair of side walls (34a) of the cover (34) are formed flat, and the pair of side walls (34a) and the top wall (34e) Three flanges (34c) may be provided along the outer peripheral surface, and a terminal mounting portion (34h) in which the low-voltage terminal (24) is inserted into both ends (34g) of the pair of side walls (34a) may be provided. In the above-described embodiment, the pair of side walls (33a, 34a) is provided on both the case (33) and the cover (34) of the second bobbin (32), but the case (33) or the cover (34 ) Is provided with a pair of side walls (33a, 34a), and the top wall (34e) of the cover (34) is provided between the pair of side walls (33a) of the case (33) to which the first bobbin (31) is attached. ) Or a pair of side walls (34a) of the cover (34) on both sides of the bottom wall (33f) of the case (33) to which the first bobbin (31) is mounted. (32) may be assembled. In this case, there is an advantage that the outer shape can be further reduced as compared with the above-described embodiment, and the assembly work of the second bobbin (32) can be further simplified. In the above embodiment, the insulating cover (41) is mounted on the outer peripheral surface of the low voltage winding (22) of the bottom wall (33f) constituting the case (33) of the second bobbin (32). However, if a very large voltage is not applied between the low-voltage winding (22) and the mounting surface, the insulating cover (41) may be omitted. Further, the outer peripheral surface of the low-voltage winding (22) of the assembly of the second bobbin (32) may be surrounded by an insulating tape, a resin plate, a resin molded product, or the like. In this case, there is an advantage that the withstand voltage between the low voltage winding (22) and the core (11, 12) is improved. Further, in the above embodiment, the fitting groove (31b) is provided at both end portions (31f) of the first bobbin (31), and the protrusion (34b) fitted into the fitting groove (31b) is covered with the cover (34 ) Are provided on the inner surfaces of both end portions (34g) of the cover (34), but recesses are provided on the inner surfaces of both end portions (34g) of the cover (34), and protrusions fitted into the recess portions are provided on both end portions ( It may be provided in 31f). In the above embodiment, the present invention is applied to a transformer using a pair of E-shaped cores (11, 12). For example, a combination of an E-shaped core and an I-shaped core, a pair of U-shaped cores, A combination of a U-shaped core and an I-shaped core, a combination of a C-shaped core and an I-shaped core, or other shaped cores facing each other to form an annular closed magnetic circuit (for example, a pair of F-shaped cores or a pair of cores) The present invention can also be applied to a transformer using an L-shaped core or a combination of an F-shaped core and an L-shaped core. Furthermore, in the above embodiment, the present invention is applied to a high-voltage transformer, but the present invention is not limited to this, and the present invention can also be applied to a reactor or choke coil having at least two windings.

  INDUSTRIAL APPLICABILITY The present invention can be suitably applied to a winding device such as a small, lightweight, high withstand voltage transformer, reactor, or coil.

Assembly perspective view showing an embodiment in which the winding device according to the present invention is applied to a transformer for high voltage Horizontal sectional view of the transformer of FIG. Longitudinal section along line III-III in FIG. Assembly perspective view showing another embodiment of the present invention Horizontal sectional view of the transformer of FIG. Longitudinal section along line VI-VI in FIG. Sectional view showing a conventional inner iron type transformer Sectional view showing another conventional transformer

Explanation of symbols

  (11,12) ・ ・ E-shaped core, (11a, 11b; 12a, 12b) ・ ・ Side leg, (11c, 12c) ・ ・ Medium leg, (13) ・ ・ U-shaped core, (13a) ・· One leg, (13b) · · The other leg, (14) · · I-core, (21) · · High-voltage winding (first winding), (22) · · Low-voltage winding Wire (second winding), (23) ・ ・ High voltage side terminal, (24) ・ ・ Low voltage side terminal, (31) ・ ・ First bobbin, (31a) ・ ・ Cylinder part, (31b) ・ ・Fitting groove (concave), (31c) ・ ・ Flange, (31d) ・ ・ Cavity, (31e) ・ ・ Terminal mounting part, (31f) ・ ・ End, (32) ・ ・ Second bobbin, (32a ) ・ ・ Cylinder, (32b) ・ ・ Fitting groove (recess), (32c) ・ ・ Flange, (32d) ・ ・ Cavity, (33) ・ ・ Case, (33a) ・ ・ Sidewall, (33b) ・・ End, (33c) ・ ・ Flange, (33e) ・ ・ Terminal mounting part, (33f) ・ ・ Bottom wall, (33g) ・ ・ Terminal insertion hole, (33h) ・ ・ Protrusion, (34) ・ ・ Cover (34a) ・ ・ Sidewall (34b) ・ ・ Protrusions (34c) ・ ・ Hula (34d) ・ ・ Hole, (34e) ・ ・ Top wall, (34f) ・ ・ Overhang, (34g) ・ ・ End, (34h) ・ ・ Terminal mounting, (41) ・ Insulation Cover, (41a) ・ ・ Cover body, (41b) ・ ・ Protrusion, (41c) ・ ・ Hole, (41d) ・ ・ Protrusion,

Claims (5)

A first bobbin having a cavity and winding a first winding on the outside; and a second bobbin assembled to surround the first bobbin and winding a second winding on the outside A core that is mounted inside the cavity of the first bobbin and outside the second bobbin to form a closed magnetic circuit;
The second bobbin has a case having a bottom wall, a cover having a top wall, and extends vertically upward from both sides of the bottom wall of the case, or extends vertically downward from both sides of the top wall of the cover. And at least a pair of side walls,
The winding device, wherein the first bobbin is disposed in a space of the second bobbin formed by the at least one pair of side walls, a bottom wall of the case, and a top wall of the cover.   The second bobbin includes a pair of first side walls extending vertically upward from both sides of the bottom wall of the case, and a pair of second side walls extending vertically downward from both sides of the top wall of the cover. 2. The winding device according to claim 1, wherein one width between the first side walls and the second side wall is larger than the other width, and the other can be disposed inside one.   Recesses or protrusions are provided at both ends of the first bobbin, and protrusions that fit into the recesses of the first bobbin or recesses that fit into the protrusions of the first bobbin are provided at both ends of the cover or the case. The winding device according to claim 1 or 2 provided on the inner surface.   The winding device according to any one of claims 1 to 3, wherein the first winding is a high voltage winding and the second winding is a low voltage winding. Winding a first winding around a first bobbin and pulling out both ends of the first winding from the first bobbin;
A case having a bottom wall and a cover having a top wall, and extending vertically upward from both sides of the bottom wall of the case or extending vertically downward from both sides of the top wall of the cover Disposing the first bobbin in the space of the second bobbin formed by the bottom wall of the case and the top wall of the cover;
Assembling the second bobbin by combining the case and the cover;
Extracting both ends of the first winding from the second bobbin;
Winding a second winding on the outer surface of the second bobbin and pulling out both ends of the second bobbin from the second bobbin;
Attaching a core to the assembly of the second bobbin around which the second winding is wound.

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