JP2515435B2 - Trance - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer formed by combining a magnetic core (hereinafter also referred to as a core) made of a magnetic material or the like with a coil bobbin having a winding, and more specifically, By preventing the magnetic core inserted into the insertion hole bored in the coil bobbin from being pulled out, and by enabling the positioning and fixing of the magnetic core, it is possible to prevent the magnetic core from being combined with the coil bobbin. The present invention relates to a transformer that is solid and smooth.

[0002]

2. Description of the Related Art A transformer (including a noise filter and a choke coil) for stepping up or stepping down a voltage or converting a current flow rate by mediating electromagnetic energy is indispensable as a functional element of an electronic device or the like. Has become.

A conventional transformer will be described with reference to FIG.

A coil bobbin 10 formed by molding a synthetic resin or the like has a winding frame main body 17 having a substantially prismatic shape around which a winding is wound in the center thereof.
A first winding stop frame 11 and a second winding stop frame 12 that perform a winding stopping action or the like are provided at both ends of the wire 7 to have a substantially bobbin shape.

An insertion hole 20 for inserting a central magnetic leg of an E-shaped core having an E-shape when viewed from above is formed in the inner core portion of the winding frame main body 17, the first winding. The stop frame 11 and the second winding stop frame 12 are opened so as to be continuously punched.

At the base end portions of the first winding stop frame 11 and the second winding stop frame 12 and outward along the bottom surface of the insertion hole 20 opened in the winding frame body 17, First magnetic core mounting base material 13 and second magnetic core mounting base material 1 on which the E-shaped core is mounted
4 are respectively extended.

The other end faces of the first magnetic core mounting base material 13 and the second magnetic core mounting base material 14 are generally formed by molding copper or the like into a substantially flat S-shape and plating tin or the like. A first frame terminal 15 and a second frame terminal 16 are provided for electrical connection with an external electronic circuit and mounting of the transformer body.

Coil bobbin 10 formed as described above
The winding frame body 17 is provided with a winding 18, which is an enamel-coated conductor obtained by baking a thin wire made of copper or the like having excellent electric conductivity with the enamel of a heat-drying varnish, for example, in order to develop a transformer function. Winding part 19
Is composed.

The winding start portion, winding end portion, intermediate lead-out portion and the like on the primary side and the secondary side are respectively attached to the planted base end portions of the first frame terminal 15 and the second frame terminal 16. It is tangled and soldered if necessary (not shown).

On the other hand, the first E-shaped core 21 made of a magnetic material such as ferrite has a central magnetic leg 31 and a pair of first side magnetic legs 3 arranged to face each other so as to sandwich the central magnetic leg 31.
2, the second magnetic leg 33, and the yoke portion 34 connecting one end of the central magnetic leg 31 and one end of each of the pair of side magnetic legs to each other.
And have an E-shaped top view shape.

The second E-type core 22 made of the same material has a line-symmetrical shape with respect to the first E-type core 21, and the first E-type core 21 and the second E-type core 22 have the same shape. The shape and length of each magnetic leg are the same as those of the coil bobbin 1.
It is determined according to the shape of each part of 0.

The central magnetic leg 31 of the first E-shaped core 21 is
The coil bobbin 10 is inserted into the insertion hole 20 as indicated by the horizontal arrow in FIG. 6, and the second E-shaped core 22 is also inserted from the opposite direction of the insertion hole 20.

After that, the first E type core 21 and the second E type core
The mold core 22 and the coil bobbin 10 are fixed by a fixture or the like (not shown), and a transformer 40 that develops a transformer function is formed by transmitting and receiving electromagnetic energy through the E-shaped cores on the primary side and the secondary side. Has been done.

Next, another conventional transformer will be described with reference to FIG.

A coil bobbin 150 formed by molding synthetic resin or the like has a winding frame main body 157 having a substantially prismatic shape around which a winding is wound, and both ends of the winding frame main body 157 are arranged. The first winding stop frame 151 and the second winding stop frame 152, which perform a winding stop action and the like, are arranged in the tongue, thereby forming a substantially bobbin shape.

An insertion hole 16 for inserting an I-shaped core having an I-shape when viewed from the top is formed in the center of the winding frame main body 157.
0 is opened so that the winding frame main body 157, the first winding stop frame 151, and the second winding stop frame 152 are continuously punched.

The I-shaped core or the like is mounted on each of the base end portions of the first winding stop frame 151 and the second winding stop frame 152, and each end portion of the winding frame body 157. The 1st magnetic core mounting base material 153 and the 2nd magnetic core mounting base material 154 are each extended.

At this time, in the first magnetic core mounting base material 153 and the second magnetic core mounting base material 154, the first insertion hole extension groove 161 and the second insertion hole extension groove 161 are formed so as to have substantially the same shape as the insertion hole 160.
The insertion hole extension groove 162 is cut out.

On the other end surfaces of the first magnetic core mounting base material 153 and the second magnetic core mounting base material 154, copper or the like is generally flat S.
First frame terminals 155 and second frame terminals 156, which are formed into a letter shape and are formed by plating tin or the like, are provided for electrical connection with an external electronic circuit and for mounting the transformer body.

Coil bobbin 15 formed as described above
The winding frame body 157 of No. 0 has, for example, a winding 158 which is an enamel-coated conductor obtained by baking a thin wire made of copper or the like having excellent electric conductivity with the enamel of a heat-drying varnish or the like. The winding portion 159 is formed by being wound around the side and the secondary side.

The winding start portion, winding end portion, intermediate lead-out portion and the like on the primary side and the secondary side are respectively provided at the planting base end portions of the first frame terminal 155 and the second frame terminal 156. And is soldered if necessary (not shown).

On the other hand, the I-shaped core 170 formed of a magnetic material such as ferrite has a substantially square pole shape and has an I-shaped top view shape.

The B-shaped core 180 made of the same material has a first magnetic leg 181 and a second magnetic leg 181 arranged in parallel.
Side magnetic leg 182, first side magnetic leg 181 and second side magnetic leg 1
A first yoke portion 18 that connects the ends of each 82
3 and the second yoke portion 184 are formed to have a square-shaped top view shape.

The I-shaped core 170 and the B-shaped core 1 are
The magnetic leg shape, the magnetic leg length, and the like of each of 80 are determined according to the shape of each part of the coil bobbin 150.

The I-shaped core 170 has a horizontal arrow H in FIG.
', The first insertion hole extension groove 161 and the second insertion hole extension groove 162 are inserted into the insertion hole 160 of the coil bobbin 150.
It is inserted by way of.

The b-shaped core 180 has the winding portion 15 of the coil bobbin 150 as indicated by a vertical arrow V'in FIG.
9 is attached to the first winding stop frame 151 and the second winding stop frame 152.

At this time, the B-shaped core 180 is mounted so as to be superposed on the I-shaped core 170, whereby the upper surface of the I-shaped core 170 and the lower surface of the B-shaped core 180 are separated from each other. They come into contact with each other to form a magnetic path there.

Thereafter, the I-shaped core 170, the B-shaped core 180, and the coil bobbin 150 are fixed by a fixture or the like not shown, and electromagnetic energy is transmitted and received through the cores on the primary side and the secondary side. As a result, the trans 190 expressing the trans function is formed.

[0029]

However, according to the transformer in which the above-mentioned conventional E-shaped cores are combined with the coil bobbin, since the E-shaped cores are E-shaped in a top view, a magnetic material is used. There is a limit to the molding thickness when molding into an E-shaped core, and if the limit is exceeded, brittleness of each leg, for example, at the connection portion with the yoke portion becomes remarkable, and distortion due to sintering of the magnetic material occurs. There is a problem in that it is more likely to occur, and thus it becomes difficult to make the transformer formed from the E-shaped core and the coil bobbin thin.

Further, there is a problem that it is difficult for the abutting surfaces of the E-shaped cores to adhere to each other.

Further, according to the transformer in which the I-shaped core and the B-shaped core are combined with the coil bobbin, the I-shaped core has a substantially quadrangular prism shape, and the B-shaped core has the side magnetic legs and the yoke portion complementary to each other. Because of the simple shape of being a square shape and reinforcing shape, the molding process of the magnetic material is easy and the limit of the molding thickness can be expanded, which contributes to the thinning of the transformer. After inserting the I-shaped core into the insertion hole and the insertion hole extension groove, and before the step of fixing the I-shaped core by a fixture, that is, when mounting the B-shaped core, etc., a means for fixing the I-shaped core is provided. Since no special measures have been taken, there is a possibility that the I-shaped core may be displaced or pulled out, which causes a problem in the process.

Further, there is a problem that the two cores are difficult to be adhered to each other because the two-cores sway on the I-shaped core.

The present invention has been made in view of the above circumstances, and prevents the magnetic core inserted into the insertion hole formed in the coil bobbin from being pulled out, and positions and fixes the magnetic core. By making it possible, it is possible to provide a transformer in which the assembling process of the magnetic core on the coil bobbin is made steady and smooth.

[0034]

In order to achieve the above object, the present invention provides a first winding stop frame and a second winding stop frame at both ends of a winding frame body of a substantially square pole shape around which a winding is wound. Is provided to form a substantially bobbin shape, and an insertion hole for inserting a T-shaped core having a T-shape in a top view is provided in a central portion of the winding frame main body and the first winding stop. The frame and the second winding stop frame are continuously opened, and the insertion holes are formed at the base end portions of the first winding stop frame and the second winding stop frame, and at the end portions of the winding frame body. So that the bottom surface of the T-core and the mounting surface of the T-shaped core are flush with each other.
A magnetic core mounting base material and a second magnetic core mounting base material are respectively extended, and first right core supporting columns are provided upright on the left and right end sides of the first magnetic core mounting base material. A contact fixing portion having a width substantially the same as that of the first winding stop frame is formed in a space between the first b-type core supporting columns, and a second b-type is formed on the left and right end sides of the second magnetic core mounting base material. The core support pillar is erected, and an insertion hole extension having a width substantially the same as that of the insertion hole is formed between the second b-type core support pillars.
A coil bobbin having a structure in which frame terminals are respectively implanted on the end face of the magnetic core mounting base material, and a winding is wound around the coil bobbins and the base end portions of the frame terminals are barred and flattened into a substantially rectangular prism shape. A T-shaped top view shape, including a magnetic core body having a bulge, a first bulge portion bulging in the left-right direction from both front ends of the magnetic core body, and a second bulge portion. The T-shaped core is inserted into the insertion hole of the coil bobbin through the abutment fixing part to the extension part of the insertion hole, and the first bulging part and the second bulging part are fitted to the abutting fixing part of the coil bobbin. A first magnetic leg and a second magnetic leg which are mounted and arranged in parallel with each other, and a first yoke portion and a second yoke which respectively connect the respective end portions of the first magnetic leg and the second magnetic leg. A first winding stop frame and a second winding stop frame in the coil bobbin. An inner wall of a b-shaped core is fitted and fixed so as to be fitted, and the b-shaped core is mounted so as to be overlapped with the T-shaped core to form a magnetic path. is there.

[0035]

In the present invention, the magnetic core mounting base material is extended from the base end portion of the winding stop frame provided at the end portion of the winding frame body to which the winding is applied, and the winding frame body and the winding stop body are provided. A coil bobbin formed by continuously forming an insertion hole in a frame and a T-shaped magnetic core having a bulge portion on one side of a magnetic core body are inserted into the insertion hole of the coil bobbin, and the T-shaped magnetic core is further inserted. A transformer is formed by mounting a mold core.

Therefore, the bulging portion of the T-shaped magnetic core inserted into the insertion hole of the coil bobbin and the winding stop frame are brought into contact with and locked to each other, whereby the T-shaped magnetic core is positioned and fixed. It

This makes it possible to prevent the T-shaped magnetic core from being pulled out from the insertion hole of the coil bobbin in the step of attaching the B-shaped magnetic core to the T-shaped magnetic core.

Further, the bulging portion of the T-shaped magnetic core suppresses the fluctuation of the B-shaped magnetic core, so that the two cores come into close contact with each other.

[0039]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an assembled state of an embodiment of a transformer according to the present invention, FIG. 2 is a perspective view showing a coil bobbin provided with a winding in the embodiment, and FIG. 3 is a T type in the embodiment. FIG. 4 is a perspective view showing a core, FIG. 4 is a perspective view showing a hollow core in the same embodiment, and FIG. 5 is a perspective view showing an appearance of a transformer in the same embodiment.

As shown in FIG. 2, a coil bobbin 50 formed by molding a synthetic resin or the like has a winding frame main body 57 of a substantially square pole shape around which a winding is wound in the center. A first bobbin stop frame 51 and a second bobbin stop frame 52, which perform a winding stop action and the like, are arranged at both ends of the bobbin frame main body 57 to form a substantially bobbin shape.

An insertion hole 60 for inserting a T-shaped core having a T-shape when viewed from the top is formed in the center of the winding frame main body 57.
However, the winding frame main body 57, the first winding stop frame 51 and the second winding stop frame 52 are opened so as to be continuously punched.

At the base end of each of the first winding stop frame 51 and the second winding stop frame 52 and each end of the winding frame main body 57, the bottom surface of the insertion hole 60 and the T-shape are formed. The first magnetic core mounting base material 53 and the second magnetic core mounting base material 54 are extended so that the mounting surfaces of the cores are on the same plane.

At this time, on the left and right end sides of the first magnetic core mounting base material 53, first b-type core support columns 63 and 63 'are provided upright, and the first b-type core support columns 63 are provided. , 63 ', a contact fixing portion 61 having a width substantially the same as that of the first winding stop frame 51 is formed.

Further, on the right and left end sides of the second magnetic core mounting base 54, second b-type core support columns 64, 64 'are provided upright, and the second b-type core support columns 64, An insertion hole extension 6 having a width substantially the same as that of the insertion hole 60 is provided in the space between 64 '.
2 is formed.

The other end faces of the first magnetic core mounting base material 53 and the second magnetic core mounting base material 54 are generally formed by molding copper or the like into a substantially flat S-shape and plating tin or the like. A first frame terminal 55 and a second frame terminal 56 are provided for electrical connection with an external electronic circuit and mounting of the transformer body.

Coil bobbin 50 formed as described above
In the winding frame main body 57, a winding 58, which is an enamel-coated conductor obtained by baking enamel or the like of a heat-drying varnish on a fine wire of copper or the like having excellent electrical conductivity, is provided on the primary side for exhibiting a transformer function, for example. And the winding part 59 is wound around the secondary side and the secondary side.
Is composed.

The winding start portion, winding end portion, intermediate lead-out portion and the like on the primary side and the secondary side are respectively provided at the planted base end portions of the first frame terminal 55 and the second frame terminal 56. And is soldered if necessary (not shown).

On the other hand, the T-shaped core 70 formed of a magnetic material such as ferrite, as shown in FIG. 3, has a magnetic core main body 73 having a flat and substantially square pole shape, and both front end portions of the magnetic core main body 73. It has a first bulge 71 and a second bulge 72 that bulge more in the left-right direction, and has a T-shaped top view shape.

Here, the T-shaped core 70 is abutted when the B-shaped core is mounted on the upper surface on the side where the first bulging portion 71 and the second bulging portion 72 are bulged. A first T-shaped core abutting portion 75 and a second T-shaped core abutting portion 76 that abuts on the other end side are provided.

The thickness of the T-shaped core 70 is based on the shape of the insertion hole 60 in the coil bobbin 50. Therefore, the thickness of the T-shaped core 70 depends on the shape of the insertion hole 60 of the coil bobbin 50. It is necessary that the support pillars 64 and 64 'have substantially the same thickness or width as compared with the thickness of the support pillars 64 and 64'.

The B-shaped core 80 made of the same material has a first side magnetic leg 81, a second side magnetic leg 82, and a first side magnetic leg 82, which are arranged in parallel, as shown in FIG. It has a first yoke portion 83 and a second yoke portion 84 that connect the ends of the magnetic legs 81 and the second magnetic legs 82, respectively, and has a square-shaped top view shape. .

Here, in the B-shaped core 80, a first B-shaped core abutting portion that abuts the lower surface of the first yoke portion 83 with the first T-shaped core abutting portion 75 of the T-shaped core 70. 85 and a second bottom core contact portion 86 that contacts the second T core contact portion 76 are provided on the lower surface of the second yoke portion 84.

Incidentally, the T-shaped core 70 and the B-shaped core 80
The magnetic leg shape, the magnetic leg length, and the like of each of the above are in accordance with the shape of each part of the coil bobbin 50, and the cross-sectional area of the magnetic core main body 73 in the T-shaped core 70 is the first side magnetic leg 81 And is equal to the sum of the cross-sectional areas of the second magnetic legs 82.

Next, as shown in FIG. 1, the T-shaped core 70 is used.
Is inserted into the insertion hole 60 of the coil bobbin 50 through the abutment fixing portion 61 as shown by a horizontal arrow H, and is inserted to the insertion hole extension portion 62.

At this time, the first bulge portion 71 and the second bulge portion bulged on the front side of the magnetic core main body 73 of the T-shaped core 70.
The bulging portion 72 is a contact fixing portion 61 which is a portion between the first b-type core supporting columns 63 and 63 ′ in the coil bobbin 50.
And the first bulging portion 71 and the second bulging portion 72 are respectively brought into contact with the first winding stop frame 51. Therefore, the coil bobbin 50 has a T-shaped core. 70
Will be fixed and fixed.

In this state, the B-shaped core 80 is
As indicated by the vertical arrow V in the figure, the coil bobbin 50 is mounted on the first winding stop frame 51 and the second winding stop frame 52.

The inner wall of the hollow core 80 is adapted to be fitted on the first winding stop frame 51 and the second winding stop frame 52, so that the hollow core 80 is fixed to the coil bobbin 50. Like

At this time, the B-shaped core 80 is mounted so as to be superposed on the T-shaped core 70, and the first T-shaped core abutting portion 75 and the first B-shaped core abutting portion 85 are combined. The second T-shaped core contact portion 76 and the second B-shaped core contact portion 86 are respectively brought into contact with each other to form a magnetic path there.

After that, the T-shaped core 70 and the B-shaped core 8 are formed.
0 and the coil bobbin 50 are fixed by a fixture or the like (not shown), and a transformer 90 that develops a transformer function by transmitting and receiving electromagnetic energy through the magnetic paths formed by the cores on the primary side and the secondary side. Are formed as shown in FIG.

According to the transformer 90 described above, the first bulging portion 71 and the second bulging portion 72 are provided at the base end portion of the T-shaped core 70 inserted into the insertion hole 60 of the coil bobbin 50, and Base material 53 for mounting the first magnetic core of the coil bobbin 50
The first winding stop frame 51 and the first B-type core support columns 63, 63 '
Since the abutment fixing portion 61 is formed by the above, when the T-shaped core 70 is inserted into the insertion hole 60, the first bulging portion 71 and the second bulging portion 72 cause the first B-shaped core supporting column 63. ，
The first winding stop frame 51 is sandwiched between 63 'and
Since the T-shaped core 70 can be positioned and fixed, the T-shaped core 70 can be positioned and fixed in the step of mounting the T-shaped magnetic core on the T-shaped magnetic core. It is possible to prevent the coil bobbin from being removed from the insertion hole and rattling.

In this embodiment, the bulging width of the first bulging portion 71 and the second bulging portion 72 of the T-shaped core 70 is set to be substantially the same as the width of the first winding stop frame 51. However, the present invention is not limited to this.
And the first magnetic core mounting base material 53
The bulging portion of the T-shaped core 70 may be formed so as to have the same width.

Further, in the present embodiment, the thickness of the T-shaped core 70 depends on the thicknesses of the first and second B-shaped core supporting columns 63 and 63 'of the coil bobbin 50. Although it was configured to be approximately thick, the T
The thickness of the die core 70 is made substantially thinner than the thickness of the first B-type core support columns 63, 63 ′ and the second B-type core support columns 64, 64 ′, and the T-type core 70 and the B-type core 80 are If a gap is provided between the two, the functional specifications of the formed transformer can be arbitrarily changed.

[0064]

Since the transformer according to the present invention is constructed as described above, it has the following effects.

(1) The coil bobbin extends the magnetic core mounting substrate from the base end of the winding stop frame provided at the end of the winding frame body, and the insertion hole is connected to the winding frame body and the winding stop frame. T formed by piercing and having a bulge on one side of the magnetic core body
A transformer is formed by inserting a die core into the insertion hole of the coil bobbin, and further attaching a bottom die core to the T core.

Therefore, the T-shaped magnetic core is positioned and fixed by abutting and locking the bulging portion of the T-shaped magnetic core inserted into the insertion hole of the coil bobbin and the winding stop frame. Therefore, in the step of mounting the B-shaped magnetic core on the T-shaped magnetic core,
It is possible to prevent the T-shaped magnetic core from rattling in the insertion hole of the coil bobbin, and to prevent the T-shaped magnetic core from being pulled out. Therefore, a solid and smooth assembly process can be achieved, and a highly reliable transformer can be provided. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembled state of an embodiment of a transformer according to the present invention.

FIG. 2 is a perspective view showing a coil bobbin provided with a winding wire in the embodiment.

FIG. 3 is a perspective view showing a T-shaped core in the same embodiment.

FIG. 4 is a perspective view showing a hollow core according to the embodiment.

FIG. 5 is a perspective view showing the outer appearance of the transformer according to the embodiment.

FIG. 6 is a perspective view showing an assembled state of a conventional transformer.

FIG. 7 is a perspective view showing an assembled state of a conventional transformer.

[Explanation of symbols]

 50 coil bobbin 51 1st winding stop frame 52 2nd winding stop frame 53 1st magnetic core mounting base material 54 2nd magnetic core mounting base material 57 winding frame body 58 winding 59 winding portion 60 insertion hole 61 abutment fixing portion 62 Insertion hole extension portion 70 T-shaped core 71 First bulging portion 72 Second bulging portion 73 Magnetic core body 80 B-type core 81 First side magnetic leg 82 Second side magnetic leg 83 First yoke portion 84 Second yoke portion 87 mounting hole 90 transformer

Claims (1)

(57) [Claims] 1. A first winding stop frame and a second winding stop frame are provided at both ends of a winding frame main body of a substantially square pole shape around which a winding is wound to form a substantially bobbin shape. An insertion hole into which a T-shaped core having a T-shape when viewed from above is inserted is opened in the center of the main body so as to connect the winding frame main body to the first winding stop frame and the second winding stop frame. Further, at the base end portions of the first winding stop frame and the second winding stop frame, and at the respective end portions of the winding frame body, the bottom surface portion of the insertion hole and the mounting surface of the T-shaped core are on the same plane. The first magnetic core mounting base material and the second magnetic core mounting base material are respectively extended so that the first magnetic core mounting base material and the second magnetic core mounting base material are provided on the left and right end portions of the first magnetic core mounting base material. Abutting and fixing portions having a width substantially the same as that of the first winding stop frame are formed in a space between the first b-type core supporting columns, and the left and right end portions of the second magnetic core mounting base material are provided. The second b-type core support pillar And an insertion hole extension having a width substantially the same as that of the insertion hole is formed in the interposing portion of the second core support column, the first magnetic core mounting base material and the second magnetic core mounting base. A coil bobbin having a structure in which frame terminals are planted on the end faces of the material, a winding is wound, and each base end of the frame terminals is spliced to form a flat core. A T-shaped core having a main body, a first bulging portion bulging in the left-right direction from both front ends of the magnetic core main body, and a second bulging portion, and having a T-shaped top view shape. Is inserted into the insertion hole of the coil bobbin through the contact fixing part to the insertion hole extension part, and the first bulging part and the second bulging part are fitted to the contact fixing part of the coil bobbin, A first side magnetic leg and a second side magnetic leg arranged in the
In the coil bobbin, there is provided a lo-shaped core having a first yoke portion and a second yoke portion, which respectively connect end portions of the side magnetic leg and the second side magnetic leg, and has a square-shaped top view shape. The first winding stop frame and the second winding stop frame are mounted and fixed so that the inner wall of the B-shaped core is fitted, and the B-shaped core is mounted so as to overlap with the T-shaped core to form a magnetic path. A transformer characterized by doing.