JP2000182848A - Transformer - Google Patents

Abstract

(57) [Problem] To minimize the melting of the lead coating when soldering the lead of the winding, which is a three-layer coated insulated wire, to the terminal without complicating the structure of the transformer. . SOLUTION: The bobbin body 1 has a winding part 10 which covers a part of a magnetic core 2 and is wound outside. The transformer is provided with a primary winding 3 and a secondary winding 4 wound around a winding portion 10 of a bobbin body 1, and one of them is a three-layer insulated wire 40. The bobbin body 1 is a three-layer insulated wire 4
A projecting piece portion 12 a provided with a terminal portion of the winding set to 0 on the lower surface on the distal end side is provided so as to project toward the side of the bobbin body 1. A lead portion 41 of the winding, which is formed into a three-layer coated insulated wire 40 from the winding portion, is turned to the lower surface side at least at the distal end side of the protruding piece portion 12a through the upper surface side of the protruding piece portion 12a. It is wound around the protruding piece 12a so as to be electrically connected to the terminal on the side by soldering.

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 It is required that electrical insulation is secured between a primary winding and a secondary winding in a transformer. For this reason, a technique of using one of the primary winding and the secondary winding as a three-layer coated insulated wire has been used.

[0003]

However, in this type of transformer, an electric connection between a lead portion drawn from a winding and a terminal is usually made by connecting the lead portion to the terminal. Soldering is performed by inserting the shaved part into a solder tank. For this reason, the coating is melted by heat transmitted through the coated conductive wire in such soldering, and in some cases, the coating of the lead portion is melted to a part of the electric wire constituting the winding or to the vicinity of the winding. Sometimes. In such a case, the electrical insulation between the primary side winding and the secondary side winding is in a state where it is difficult to physically secure it. A method that does not cause the coating of the lead portions of the windings to be insulated wires to melt is strongly demanded in the manufacture of this type of transformer.

Therefore, the present invention minimizes the melting of the coating of the lead portion in the soldering of the lead portion of the winding, which is a three-layer coated insulated wire, to the terminal without complicating the structure of the transformer. It is an object of the present invention to provide a transformer having a structure that can be held down to a minimum.

[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 having a magnetic core and a winding portion that covers at least a part of the magnetic core and is provided with an outer winding, and the winding portion of the bobbin body has a primary winding and a secondary winding. A transformer having a three-layer coated insulated wire, wherein one of the primary winding and the secondary winding is provided as a three-layer insulated wire; and (2) the bobbin in the transformer. The body has a protruding piece having a terminal portion of the winding, which is the three-layer-coated insulated wire, protruding from the lower surface on the distal end side so as to protrude toward the side of the bobbin body. 3) A lead portion of the winding, which is the three-layered insulated wire from the winding portion of the bobbin body, is at least at the tip side of the protruding piece portion, passes through the upper surface side of the protruding piece portion, and faces the lower side. It is turned around and the terminals on the lower surface side are electrically connected by soldering. So as to be connected to and wound on the protruding piece portion.

[0006] According to this configuration, the electrical connection of the lead portion of the winding, which is a three-layer insulated wire, to the terminal,
Even when the terminal is soldered by attaching the terminal to a solder bath in a state where the lead portion is detached, the heat generated by the soldering is absorbed by the protruding piece around which the winding is wound, and the necessary As described above, the insulation coating of the secondary winding can be prevented from melting.

Particularly, on the tip side of the protruding piece, only the foremost part of the lead of the secondary winding is located on the lower surface side of the protruding piece, so that the soldering is performed. In the case where the solder tank is attached to the solder tank, the opening edge of the solder tank can be prevented from directly touching the lead part other than the connecting part to the terminal, and the solder tank can be radiated from below. It is possible to prevent the generated heat from being easily transmitted to the lead portion other than the connection portion to the terminal.

[0008] In addition, a cooling air is blown from above onto the lead portion located on the upper surface side of the protruding piece portion so as to minimize the melting of the insulating coating of the lead portion, so that the soldering bath is inserted into the solder bath. Can be easily performed.

[0009]

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 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 with the magnetic core 2 of the transformer omitted, and FIG. 3 particularly shows a laminated winding portion on the lower end side of the bobbin body 1. FIG. Only the lead portion 41 of the secondary winding 4 applied to 15 ″ is shown. In FIG. 4, in particular, the laminated winding portion 15 ″ on the upper end side of the bobbin body 1 and the laminated portion on the lower end side Only the lead 30 of the primary winding 3 applied over the winding point 15 "is shown, and in FIG. 5 in particular the drive winding point 15 'on the bobbin body 1. Only the lead of the drive winding 5 is shown.

FIGS. 6 and 7 show a state in which the magnetic core 2 of the transformer is omitted and only the lead 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 portion 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 portion 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.

FIG. 11 to FIG. 13 are cross-sectional configuration diagrams in which the magnetic core 2 of the transformer is omitted and the transformer is sectioned at different positions in a direction orthogonal to the winding axis of the winding unit 10. is there.

FIG. 14 shows a state in which the magnetic core 2 of the transformer is omitted and only the lead 30 of the primary winding 3 and the lead 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 'side.
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.

Further, in this embodiment, the winding portion 1 of the bobbin body 1 between the pair of middle collars 14, 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 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 by entanglement of the lead portion 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 portion 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. 4 of the first mounting portion 12 '. . Further, the lead portion 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 this embodiment, the lead 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 13 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 portion 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 applied with the primary winding 3 and thereafter, the lead 32 on the winding end side of the primary winding 3 applied to the laminated winding portion 15" on the upper end side 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 portion 32 on the winding end side of the primary winding 3 applied to the laminated winding portion 15 "on the lower end side is formed 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 portion 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 easy to maintain.

On the other hand, in this embodiment, one lead 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 portion 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 portion of the drive winding 5. A groove 19 is formed. (Fig. 5)

Also, in this embodiment, a part of the secondary winding 4 is applied to the primary winding 15 ″ at the upper end side of the bobbin body 1 before the primary winding is applied. 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
The one lead portion 41 of the secondary winding 4 applied to the laminated winding portion 15 ″ on the upper end side in 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 portion 41 of the winding 4 on the side is the second projecting piece portion 12 from the right constituting the second mounting portion 12 ″.
a terminal 13a. Further, the pair of middle collars 14, 14 and the first mounting portion 12 'are adapted to receive the lead portions of the secondary winding 4 applied to the laminated winding portion 15 "on the upper end side. A groove 19 is formed (FIG. 1).

In FIG. 3, one of the lead portions 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 portion 41 is electrically connected to the terminal 13 of the second projecting piece portion 12a from the left that constitutes the second attachment portion 12 ″. Is formed with a split groove 19 for accommodating the lead portion 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 lamination winding point 15 ″ on the upper end side of the bobbin body 1 and the lamination 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 portions 41 of the secondary winding 4 are wound around the protruding piece portions 12a constituting the second mounting portions 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 protrusion 1 of lead portion 41 of 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 portion 41
Is formed. Then, the lead portion 41 pulled 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 portion on the tip end side of the protruding piece portion 12a on the side opposite to the side end where the hooking recess 12e is provided is provided.

As a result, in this embodiment, the electrical connection between the lead portion 41 of the secondary-side winding 4 and the terminal 13, which is a three-layer 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. In particular, on the tip side of the protruding piece 12a, only the foremost part of the lead 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 portion 41 with the opening edge Ha of the lead portion 41 other than the tip end portion, and to prevent heat radiated upward from the solder tank H from being transmitted to the portion other than the tip end portion of the lead portion 41. Further, such a solder tank H that blows cooling air from above onto the lead portion 41 located on the upper surface 12b side of the protruding piece portion 12a to minimize the melting of the insulating coating of the lead portion 41. 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 leads 30, 41, 50 are attached to the mounting section 12 as shown in FIG. 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 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.

[0038]

According to the transformer of the present invention, the soldering of the leads of the windings, which are three-layer coated insulated wires, to the terminals can be performed without complicating the structure of the transformer. Of the coating can be minimized.

[Brief description of the drawings]

FIG. 1 is a side view of a transformer (in particular, only a lead portion 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 portion 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 portion 30 is shown.)

FIG. 5 is a side view of a transformer (in particular, only a lead portion 50 of the 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 portion 41 of a secondary winding 4 is shown).

FIG. 7 is a bottom view of a transformer (in particular, only a lead portion 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 the lead portion 50 of the drive winding 5 only. )

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 12a Protruding piece part 13 Terminal 3 Primary winding 4 Secondary winding 40 Tri-layer insulated wire 41 Lead part

Claims (1)

[Claims] 1. A bobbin body having a magnetic core and a winding portion which covers at least a part of the magnetic core and is provided with an outer winding, and a primary-side winding is provided on the winding portion of the bobbin body. And a secondary winding wound around the bobbin body of the transformer, wherein one of the primary winding and the secondary winding is a three-layer insulated wire. Has a protruding piece having a terminal portion of the winding which is the three-layer coated insulated wire protruding from the lower surface on the distal end side so as to protrude toward the side of the bobbin body, and the bobbin. A lead-out lead portion of the winding which is the three-layer coated insulated wire from the winding portion of the body is turned to the lower surface side through the upper surface side of the projecting piece portion at least at the tip side of the projecting piece portion. It is electrically connected to the terminal section on the lower surface side by soldering. As it will be trans, characterized in that the wound on the protruding piece portion.