JP2000182849A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure sufficient insulation between an outgoing line of one kind of winding formed at two or more positions of a bobbin and a wire of another kind of winding in a transformer. SOLUTION: A transformer includes two or more windings to be insulated electrically, and a bobbin 1 with a winding part 10 in which a magnetic core is partly inserted, is provided. The winding part 10 of the bobbin 1 has individual winding positions 15. One kind of winding from among two or more windings is turned on by at least two or more winding positions 15 at the winding part 10 in the bobbin 1. In this case, the bobbin 1 has an insulating wire storing hole 16 for storing an outgoing line of one kind of winding with a length between two or more winding positions 15, on which one kind of winding is turned, and a wire-passing groove 17 is joined with respect to the insulating storing hole 16 on a groove-bottom side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a transformer used as a converter transformer or a power supply transformer in various electric appliances.

[0002]

2. Description of the Related Art Converter transformers and power supply transformers used for various types of electric equipment are configured from the viewpoint of meeting the required electrical performance and improving the electrical performance of the transformer. The winding part in the bobbin body is divided into several winding points, and the primary side winding or the secondary side winding, or the secondary side, so as to cover two or more of the winding points. Feedback voltage or drive voltage to make the output voltage of IC constant
There is a device which is configured by applying a drive winding acting on a control element such as the above. (A bobbin body in which the winding portion constituting such a transformer is divided into a plurality of winding locations is generally called a section bobbin.)

[0003]

However, in the case where one kind of winding is applied so as to cover two or more winding points among the plurality of winding points formed on the bobbin body in this manner, the one type of winding is applied. Between a part of one type of winding and one applied winding and another part of the one type of winding between another applied part The electric wire drawn from the one type of winding is located. From the viewpoint of stably ensuring the performance of the transformer, it is desired to ensure as much electrical insulation between the one type of winding and the other type of winding as possible. In particular, a winding between one winding location where a part of the one kind of winding is applied and another one winding location where another part of the one kind of winding is applied In the case where another type of winding is applied to the location, the electrical connection between the electric wire drawn from the one type of winding and the other type of winding applied to the winding location located between the wires. Insulating properties are more likely to be impaired. A method of securing such insulation by separately wrapping an insulating tape, etc. is also adopted, but such a method requires a process of winding the insulating tape and makes it difficult to downsize the entire transformer. there were.

Accordingly, the present invention is applied to two or more winding points among a plurality of winding points in a bobbin body constituting a transformer without complicating the structure of the transformer. It is an object of the present invention to provide a transformer having a structure capable of sufficiently securing electrical insulation between a lead wire positioned between the two or more winding portions of a type of winding and another type of winding. .

[0005]

In order to achieve the above-mentioned object, according to the present invention, a transformer comprises:
The configuration (3) was provided. (1) A bobbin body including two or more windings that are required to be electrically insulated from each other, and having a winding part in which at least a part of a magnetic core is inserted inside, and A transformer provided with a plurality of winding sections divided in a winding section of the bobbin body, and (2) at least two or more winding sections among the plurality of winding sections in the winding section of the bobbin body. And (3) the bobbin body includes the one type of winding among the plurality of winding locations. An insulating storage hole for an electric wire drawn out from the one type of winding having a length extending between two or more winding locations provided, and the electric wire communicated with the insulating storage hole on one side of a groove bottom side And an introduction groove.

According to this configuration, one of the two or more windings is applied to at least two or more of the plurality of winding locations in the winding portion of the bobbin body. An electric wire (hereinafter, this electric wire is referred to as a lead wire) drawn out from the one type of winding positioned between the two or more winding locations in the winding of (i) is stored in the insulating storage hole through the introduction groove. Therefore, electrical insulation between the lead wire and another type of winding can be improved.

[0007] Since the insulating storage hole communicates with the introduction groove on one side of the groove bottom of the introduction groove, the lead wire once guided into the insulating storage hole from the introduction groove again becomes the insulating storage hole. It is difficult for the lead wire to escape from the introduction groove, and the electrical insulation between the lead wire and another type of winding can be stably maintained.

[0008] The two or more windings that are required to be electrically insulated from each other in the transformer are a primary winding, a secondary winding, and a drive winding. .

[0009] In general, the winding portion in the winding portion of the bobbin body is divided by an outer collar surrounding the winding portion. When the winding location is divided by such an outer flange, a cutout portion communicating with the introduction groove may be formed in the outer flange.

[0010] Among the plurality of winding portions in the winding portion of the bobbin body, a winding portion located at a lowermost stage with respect to a mounting portion provided with a connection terminal for connecting the bobbin body to a substrate or the like; When the one type of winding is applied so as to extend between some of the winding points on the upper end side of the bobbin body which is located with some of the winding points between the winding points and Is electrically connected to the terminal by providing the insulating storage hole and the introduction groove so that the insulation storage hole and the introduction groove for accommodating the lead wire are opened near the terminal on the lower surface of the mounting portion. The lead wire is guided through the introduction groove to the winding point where the one type of winding at the uppermost end of the bobbin body is applied, and the one type of winding at the uppermost end is applied. The one type of winding does not interfere with the winding location Ku subjected, it is possible to perform the one type of winding as over the two or more winding points.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view showing the overall structure of the transformer according to this embodiment so that it can be easily understood. In FIG. Only the lead wire 41 of the secondary winding 4 applied to the winding location 15 "is shown. FIG. 2 is a cross-sectional view of the transformer with the winding omitted.

FIGS. 3 to 5 are side views showing the transformer without the magnetic core 2 of the transformer. FIG. Only the lead wire 41 of the secondary winding 4 applied to 15 "is shown, and in FIG. 4, in particular, the laminated winding portion 15" on the upper end side of the bobbin body 1 and the lamination on the lower end side Only the lead wire 30 of the primary winding 3 applied over the winding point 15 ″ is shown, and in FIG. 5 in particular on the drive winding point 15 ′ in the bobbin body 1. Only the lead wire of the drive winding 5 is shown.

FIGS. 6 and 7 show a state in which the core 2 of the transformer is omitted and only the lead wire 41 of the secondary winding 4 is shown. In FIG. FIG. 7 shows the transformer when viewed from below. FIGS. 8 and 9 show a part of the second mounting portion 12 ″ to which the lead wire 41 of the secondary winding 4 is electrically connected, in a perspective view with its direction changed. 10 omits the core 2 of the transformer and sets the winding 4 on the secondary side.
In a state where only the lead wire 41 is shown,
FIG. 4 is a configuration diagram showing a state where the terminal 13 having the flared terminal 13 is attached to the solder tank H as viewed from the side.

FIGS. 11 to 13 are sectional structural views showing the transformer at different positions in a direction perpendicular to the winding axis of the winding part 10 with the magnetic core 2 of the transformer omitted. is there.

FIG. 14 shows a state where the magnetic core 2 of the transformer is omitted and only the lead wire 30 of the primary winding 3 and the lead wire 50 of the drive winding 5 are shown. Are shown from below.

FIGS. 15 to 19 show the bobbin body 1 constituting the transformer, respectively. FIG. 15 shows the bobbin body 1 viewed from the first mounting portion 12 '.
FIG. 16 shows the bobbin body 1 attached to the second mounting portion 12 ″.
FIG. 17 is a side view in which the terminals 13 of the mounting portions on the opposite sides are omitted and viewed from the side, and FIG.
15 shows the bobbin body 1 from above, FIG. 18 shows the bobbin body 1 from above, and FIG.
Is shown from below.

The transformer according to this embodiment is:
(1) A bobbin body 1 made of an insulating material having a rectangular cylindrical winding portion 10 with both ends opened, and (2) the bobbin with the middle foot portion 20 inserted inside the bobbin body 1 A magnetic core 2 to be assembled to the body 1, and (3) a primary-side winding formed and wound by winding an insulated wire around the winding portion 10 of the bobbin body 1 before the magnetic core 2 is assembled. A control IC for keeping the secondary voltage constant with the line 3, the secondary winding 4 and the primary winding 3
And a drive winding 5 for applying a feedback voltage or a drive voltage of the control element to a control element such as a hybrid IC.

The bobbin body 1 has an upper flange 11 having a rectangular outer edge on the outer side around the upper end opening 10 ', and terminals 13 on both sides of the lower end opening 10 ".
Each of the mounting portions 12 of the pair of terminals 13 is provided with a plurality of rod-shaped terminals 13 projecting downward.

In this embodiment, one of the mounting portions 12 of the pair of terminals 13 is connected to the bobbin body 1.
Are formed as four elongated plate-shaped protruding pieces 12a, 12a,... Protruding in a direction substantially perpendicular to the outer surface of the winding. Each of the protruding pieces 12a, 12a,... Protrudes at substantially equal intervals and in the same direction so as to be parallel to each other. One wide surface 12b is positioned above the bobbin body 1 and the other wide surface 12c is formed. Is directed downward of the bobbin body 1. The terminals 13 are provided one by one on the lower surface 12c on the distal end side of the protruding piece portion 12a.

The bobbin body 1 has a winding 10
At the center in the winding axis direction, a pair of middle collars 14, 14 surrounding the winding part 10 are provided in two stages, upper and lower, at intervals. Are divided into three winding locations 15, 15,.... The pair of middle collars 14, 14 are also configured so that the contour of the outer edge is square.

In this embodiment, the winding portion 1 of the bobbin body 1 between the pair of middle flanges 14 is provided.
0 is a drive winding point 15 'of the drive winding 5, and winding points 15, 15 on both sides of the drive winding point 15' are windings on the primary side. This is a laminated winding point 15 ″ where the wire 3 is applied and the secondary winding 4 is superimposed on the outer surface of the previously applied primary winding 3.

In this embodiment, the drive winding 5 and the primary winding 3 are electric wires having a single insulation coating. The secondary winding 4 is a three-layer insulated wire 40.

The drive winding 5 and the primary winding 3 are connected to the mounting portion 12 of the terminal 13 which is not constituted by the protruding piece 12a (hereinafter referred to as the first mounting portion 1).
2 '. ) Is connected to the lead wire 3
0 and 50, and the secondary winding 4 is connected to the mounting portion 12 of the terminal 13 formed by the protruding piece portion 12a (hereinafter referred to as the second mounting portion 12). ) Is electrically connected to the terminal 13 via the lead wire 41.

More specifically, in this embodiment, the primary winding 3 is applied to the winding section 10 first. In this embodiment, after a part of the primary winding 3 is applied to the laminated winding portion 15 ″ on the upper end side of the bobbin body 1, the bobbin body 1
The other part of the primary winding 3 is applied to the laminated winding part 15 ″ on the lower end side in FIG.

The lead wire 31 on the winding start side of the primary winding 3 is electrically connected to the terminal 13 located at the second position from the right in FIG. . Further, the lead wire 32 on the winding end side of the primary winding 3 is electrically connected to the terminal 13 located at the third position from the right in FIG.

In the present embodiment, the lead wire 31 on the winding start side of the primary winding 3 is located on the upper end side of the bobbin body 1 from the base side of the terminal 13 to which the lead wire 31 is electrically connected. An insulating housing hole 16 of an electric wire having a length reaching the laminated winding point 15 "is formed with an opening 16a at the lower surface of the first mounting portion 12 'and the other end at the upper end side of the bobbin body 1. Laminated winding point 1 located in
5 ”, the bobbin body 1
It is formed within the thickness. In addition, an electric wire introduction groove 17 is provided on the outer surface of the bobbin body 1 so as to be located along the insulation accommodation hole 16 and on the side of the insulation accommodation hole 16. On one side 17a on the groove bottom side, the insulating storage hole 16 and the introduction groove 17 are configured to communicate with each other in the length direction of the insulating storage hole 16. Further, the first mounting portion 12 'and the pair of middle collars 14, 1
4 is provided with a cutout portion 18 communicating with the introduction groove 17. In this embodiment, the bobbin is held in a state where the lead wire 31 on the winding start side of the primary winding 3 is housed in the insulating housing hole 16 through the introduction groove 17. Laminated winding point 1 on the upper end side of body 1
5 "is wound with the primary winding 3 and then the lead wire 32 at the end of winding of the primary winding 3 applied to the laminated winding portion 15" at the upper end is connected to the drive winding. Point 1
The primary winding 3 is further applied to the laminated winding point 15 "at the lower end side of the bobbin body 1 through the split groove 19 formed at 5 'and drawn into the laminated winding point 15" at the lower end side of the bobbin body 1. The lead wire 32 on the winding end side of the primary winding 3 applied to the laminated winding portion 15 "on the lower end side is passed through the split groove 19 formed in the first mounting portion 12 '. It is configured to be drawn out to the lower surface side of one mounting portion 12 'and electrically connected to the terminal 13 (FIG. 4).
In this embodiment, in particular, the electrical insulation between the lead wire 31 on the winding start side of the primary winding 3 and the drive winding 5 is ensured to be high, and the transformer has a predetermined performance. It is said to be easy to maintain.

On the other hand, in this embodiment, one lead wire 50 of the drive winding 5 is
The first terminal 1 from the left in the first mounting portion 12 '
3 and the other lead wire 50 of the drive winding 5 is electrically connected to the second terminal 13 from the left in the first mounting portion 12 '. Further, of the pair of middle flanges 14, 14, the middle flange 14 located at the lower end side of the bobbin body 1 and the first mounting portion 12 'are provided with a split for accommodating the lead wire of the drive winding 5. A groove 19 is formed. (Fig. 5)

Also, in this embodiment, a part of the secondary winding 4 is formed on the primary winding portion 15 ″ at the upper end of the bobbin body 1 at the primary winding portion 15 ″. Outside of the winding 3 and another part of the secondary winding 4
At the laminated winding point 15 "on the lower end side of the bobbin body 1, the winding is applied outside the primary winding 3 previously applied (FIG. 1).

In this embodiment, the bobbin body 1
In FIG. 1, one lead wire 41 of the secondary winding 4 applied to the laminated winding portion 15 ″ on the upper end side of FIG.
The second mounting portion 12 "is electrically connected to the terminal 13 of the first projecting piece portion 12a from the right and constitutes the second mounting portion 12". The other lead wire 41 of the winding 4 is connected to the second projecting piece 12 from the right which constitutes the second mounting portion 12 ″.
a terminal 13a. Also, the pair of middle collars 14, 14 and the first mounting portion 12 'are provided with a split for accommodating the lead wire of the secondary winding 4 applied to the laminated winding portion 15 "on the upper end side. A groove 19 is formed (FIG. 1).

Further, one lead wire 41 of the secondary winding 4 applied to the laminated winding portion 15 ″ on the lower end side of the bobbin body 1 is connected to the second mounting portion 1 in FIG.
2 "of the secondary winding 4 electrically connected to the terminal 13 of the first projecting piece 12a from the left, and applied to the laminated winding portion 15" on the lower end side. The other lead wire 41 is electrically connected to the terminal 13 of the second projecting piece 12a from the left that constitutes the second mounting portion 12 ″. Is formed with a split groove 19 for accommodating the lead wire 41 of the secondary winding 4 applied to the laminated winding portion 15 ″ on the lower end side. (Fig. 3)

In this embodiment, the secondary winding 4 applied to the laminated winding portion 15 ″ on the upper end side of the bobbin body 1 and the laminated winding 4 on the lower end side of the bobbin body 1 The secondary winding 4 applied to the winding portion 15 "is connected to the terminal 13 of each protruding piece 12a constituting the second mounting portion 12".
Are electrically connected to each other via a pattern of a circuit board to be electrically connected to the secondary winding 4 as a whole.

In this embodiment, the lead wires 41 of the secondary winding 4 are wound around the protruding pieces 12a constituting the second mounting portion 12 ". The distal end is electrically connected to a terminal 13 provided on the protruding piece 12a.

That is, in this embodiment, the lower surface 1 of the protruding piece portion 12a on the protruding base side is used.
2c, hook 1 of the lead wire 41 of the secondary winding 4
2d, and the projecting piece 12a at a position approximately in the middle of the length of the projecting piece 12a in the longitudinal direction.
The hooking recess 12e of the lead wire 41 is
Is formed. Then, the lead wire 41 drawn out to the lower surface side of the second mounting portion 12 ″ is
After being hooked on 2d, it is hooked on the hooking recess 12e and hooked on the upper surface 12b side of the protruding piece 12a, and further on the tip side of the protruding piece 12a, the lower surface 12c of the protruding piece 12a again. And is electrically connected to a terminal 13 provided on the tip side. Further, a hooking recess 12f for positioning a lead wire at the tip end side of the protruding piece portion 12a, which is opposite to the side end on which the hooking recess 12e is provided, is provided.

As a result, in this embodiment, the electrical connection of the lead wire 41 of the secondary winding 4 to the terminal 13 as the three-layer coated insulated wire 40 is performed. Even if the terminal 13 is attached to the solder tank H in a state where the terminal coil 13 is detached, the heat generated by the attachment is absorbed by the protruding piece 12a, and the insulation coating of the secondary winding 4 is more than necessary. Can be prevented from melting. Particularly, on the tip side of the protruding piece 12a, only the foremost part of the lead wire 41 of the secondary winding 4 is located on the lower surface 12c side of the protruding piece 12a. To prevent contact of the lead wire 41 with a portion other than the leading end of the lead wire 41 with the opening edge Ha, and to prevent heat radiated upward from the solder bath H from being transmitted to portions other than the leading end of the lead wire 41. Further, such a solder bath H that blows cooling air from above onto the lead wire 41 positioned on the upper surface 12b side of the protruding piece portion 12a to minimize the melting of the insulating coating of the lead wire 41 is provided. Can be easily performed.

As described above, the primary winding 3, the drive winding 5, and the secondary winding 4 are applied to the winding section 10, and their lead wires 30, 41, 50 are attached to the mounting section 12. In this embodiment, the two cores 21 having an E-shape are electrically connected to the terminals 13 of
The midfoot portion 21a of one of the cores 21 is inserted into the inside of the winding portion 10 from the upper end opening 10 'of the bobbin body 1, and the other midfoot portion 21a of the core 21 is The two cores 21 and 21 are combined so as to be inserted into the inside of the winding part 10 from the lower end opening 10 ″, and an insulating tape or the like is wound around the outer periphery of the cores 21 to maintain the combined state. The transformer is configured by this configuration.

In this embodiment, the outer surface 1 of the drive winding portion 15 'in the bobbin body 1 is provided.
The outer surface 15a of the drive winding portion 15 'is positioned such that the outer surface 15a of the drive winding portion 15' is substantially flush with the outer surface 33 of the primary winding 3 applied to the laminated winding portion 15 ". 1
It is formed outside the outer surface of 5 ".

That is, in this embodiment, the drive winding portion 1 located between the pair of middle collars 14,
5 ′, so that the outer surface 15a is located outside the outer surface of the laminated winding portion 15 ″.
The bobbin body 1 is formed so that the thickness of 5 ′ is greater than the thickness of the laminated winding portion 15 ″.

As a result, in this embodiment, the distance between the drive winding 5 applied to the drive winding portion 15 ′ and the outer surface of the magnetic core 2 inside the winding part 10, The distance between the outer surface and the secondary winding 4 can be made substantially equal, and the drive winding 5 and the secondary winding 4 are kept in a uniform state in the degree of magnetic coupling to the magnetic core 2. In this case, it is possible to more appropriately control the input / output voltage ratio to a predetermined value by the drive winding 5 and the control element.

[0040]

According to the transformer of the present invention, it is possible to cover two or more winding points among a plurality of winding points in the bobbin body constituting the transformer without complicating the structure of the transformer. In this case, it is possible to sufficiently secure electrical insulation between the lead wire positioned between the two or more winding locations of one type of winding and another type of winding.

[Brief description of the drawings]

FIG. 1 is a side view of a transformer (in particular, only a lead wire 41 of a secondary winding 4 applied to a laminated winding portion 15 ″ on the upper end side of a bobbin body 1 is shown).

FIG. 2 is a sectional configuration diagram of a transformer.

FIG. 3 is a side view of a transformer (in particular, only a lead wire 41 of a secondary winding 4 applied to a laminated winding portion 15 ″ on the lower end side of the bobbin body 1 is shown).

FIG. 4 is a side view of a transformer (particularly, a primary winding 3 provided over a laminated winding point 15 ″ on the upper end side and a laminated winding point 15 ″ on the lower end side of the bobbin body 1; (Only the lead wire 30 is shown.)

FIG. 5 is a side view of a transformer (in particular, only a lead wire 50 of a drive winding 5 applied to a drive winding portion 15 ′ in the bobbin body 1 is shown).

FIG. 6 is a plan view of a transformer (in particular, only a lead wire 41 of a secondary winding 4 is shown).

FIG. 7 is a bottom view of a transformer (in particular, only a lead wire 41 of a secondary winding 4 is shown).

FIG. 8 is a perspective view of a main part of a transformer.

FIG. 9 is a perspective view of a main part of a transformer.

FIG. 10 is a side view showing a transformer manufacturing process.

11 is a sectional view taken along line AA in FIG.

FIG. 12 is a sectional view taken along line BB in FIG. 4;

FIG. 13 is a sectional view taken along line CC in FIG. 4;

FIG. 14 is a bottom view of a transformer (particularly, a primary winding 3)
, And only the lead wire 50 of the drive winding 5. )

FIG. 15 is a side view of the bobbin body 1.

FIG. 16 is a side view of the bobbin body 1.

FIG. 17 is a side view of the bobbin body 1.

FIG. 18 is a plan view of the bobbin body 1.

FIG. 19 is a bottom view of the bobbin body 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bobbin body 10 Winding part 15 Winding point 16 Insulation accommodation hole 17 Introducing groove

Claims (1)

[Claims] 1. A bobbin body comprising two or more windings required to be electrically insulated from each other, and having a winding part into which at least a part of a magnetic core is inserted inside, A transformer provided with a plurality of winding sections divided in a winding section of the bobbin body, wherein at least two or more winding sections of the plurality of winding sections in the winding section of the bobbin body are provided. Over this, one type of winding of the two or more windings is applied, and the bobbin body is applied with the one type of winding of the plurality of winding locations. An insulating storage hole for an electric wire drawn out of the one type of winding having a length extending between two or more winding locations, and an introduction groove of the electric wire communicated with the insulating storage hole on one side of a groove bottom side. A transformer characterized by having: