JPH06231983A - Small-sized transformer - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost by decreasing the number of processes while maintaining high insulation without damaging a bonding characteristic between coils of a small-sized transformer. CONSTITUTION:Out of a plurality of coils 1, 2, 3, 4, ..., the coil 1 is divided into two coils. One coil 1a of the two-divided coil 1 is put on a bobbin 5. A collar 9 of the coil 6 is constituted of a thick part 9a at the inner diameter side and a thin part 9b at the outer diameter side. The coils 3 and 4 are wound in this order in a narrow space 10a of the bobbin 6, with a first intercoil insulating layer 11 placed between the coils 3 and 4. On the coil 3 and 4, a second intercoil insulating layer 12 is formed in full width of a wide space 10b of the bobbin 6. Then, the other coil 1b of the two-divided coil 1 is wound in multilayers on the insulating layer 12 through a layer insulating layer 13. The winding width W1 of the coil 1b is equal to or small than the winding width W3 of the coils 3 and 4. Inner iron section 7a.8a of a magnetic core 7.8 is set right in the bobbin 5 and the bobbin 5 is set right in the bobbin 6 and thus, the magnetic core and the bobbins 5 and 6 are assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small transformer used as a power source for electronic equipment.

[0002]

2. Description of the Related Art In the prior art, there is a small transformer for a power supply of electronic equipment, which is constructed as follows, for example, as shown in FIG. That is, the plurality of windings 1, 2, 3, 4, ...
, A plurality of winding frames 5 and 6 around which the windings 1, 2, 3 and 4 are wound, and a pair of windings that surround the windings 1, 2, 3 and 4 and are combined with each other to form a closed magnetic circuit. It consists of magnetic cores 7 and 8. The winding frame 5 is formed so that the inner iron portions 7a and 8a of the pair of magnetic cores 7 and 8 can be inserted and fitted, and the winding frame 6 is formed so that the winding frame 5 can be inserted and fitted. Constitute. Reference numeral 20 is a terminal portion 21 formed integrally with the reel 5.
Is a lead-out connection terminal provided in the. In the above transformer, the windings requiring high insulation among the plurality of windings 1, 2, 3, 4, ... Are separated into the plurality of winding frames 5 and 6, respectively,
For example, the winding 1 is wound around the winding frame 5, and the windings 2, 3, 4, ... Are wound around the winding frame 6. Further, if necessary, the number of outer winding frames into which the winding frame 6 can be inserted and fitted can be increased, and the necessary windings of the windings 2, 3, 4, ... Can be separately wound on the outer winding frame. is there.

[0003]

The above-mentioned conventional techniques have the following problems. The winding 1 and the windings 2, 3, 4, ...
And the winding frame 6 are separately wound, so that the windings having a large thickness separate the windings from each other, so that the winding 1 and the windings 2, 3, 4, ... Are insulated from each other. Although the performance is good, the coupling coefficient between the windings may be small and the expected characteristics may not be obtained. In order to achieve both the insulation and the coupling coefficient between the windings, the combination of the winding frame 5 and the winding frame 6 is stopped, and the windings and the insulating layers are alternately superposed and wound. Although a line structure can be adopted, this method requires a lot of man-hours and increases the manufacturing cost. The present invention seeks to achieve both insulation and coupling coefficient between the high-insulation windings of a small-sized transformer, maintaining the required creepage distance between the windings, reducing man-hours without impairing characteristics, and reducing manufacturing costs. The challenge is to reduce it.

[0004]

In order to achieve the above object, the present invention adds the following improved structure to the above prior art as shown in FIG. 1, for example. That is, the winding 1 of the plurality of windings 1, 2, 3, 4, ... Is divided into two, and one of the divided windings 1 a is wound around the winding frame 5.
Further, the collar portion 9 of the winding frame 6 is formed by a thick portion 9a on the inner diameter side and a thin portion 9b in which the inner thickness on the outer diameter side of the thick portion 9a is reduced. Then, in the narrow space 10a surrounded by the thick portion 9a of the space 10 formed by the winding frame bottom portion 6a and the flange portion 9 of the winding frame 6, the plurality of windings 1, 2, 3 ,. The windings 3, 4, ... Of the windings 4, ...
And interpose them in order to wind them. Further, in the wide space 10b surrounded by the thin portion 9b of the collar portion 9, the winding 3
-4. The second inter-wire insulating layer 12 having the wide width of the wide space 10b is interposed in the upper layer of 4 ..., and the other split winding 1b of the winding 1 is wound in multiple layers with the interlayer insulating layer 13 interposed. . Further, the winding width W1 of the other divided winding 1b is formed to be equal to or smaller than the winding width W3 of the windings 3, 4, ...
Then, the inner iron portions 7a and 8a of the pair of magnetic cores 7 and 8 are inserted and fitted into the winding frame 5, and the winding frame 5 is inserted and fitted into the winding frame 6 to be combined with each other. .

[0005]

The present invention operates as follows. The winding 1 requiring high insulation is divided into two, one of the divided windings 1a is wound on the winding frame 5, and the other divided winding 1b is connected to the winding frame bottom 6a of the winding frame 6.
In the wide space 10b surrounded by the thin wall portion 9b of the space 10 formed by the collar portion 9 and the collar portion 9, the second inter-layer insulating layer 12 that is the full width of the wide space 10b is provided above the windings 3, 4 ... In addition to the interposition, the multi-layer winding is performed while interposing the interlayer insulating layer 13. The winding width W1 of the split winding 1b is set to the winding 3
By setting the winding width W3 of 4 ... (i.e., the width of the narrow space 10a) to be equal to or less than the winding width W3, the creeping distance L between the outer edges of the windings can be secured and the insulation can be improved. Also, the winding 3
Numeral 4 is wound around the same winding frame 6 in order in the narrow space 10a surrounded by the thick portion 9a of the collar portion 9 with the first inter-wire insulating layer 11 interposed between the windings. Yes, this winding 3 ...
The second inter-wire insulating layer 12 is only interposed between the other divided winding 1b. The first wire-to-wire insulation layer 11 and the second wire-to-wire insulation layer 12 are formed of a film thinner than the winding frame, and the other split winding 1b and one split wound around the winding frame 5 are formed. Since the windings 3 and 4 are sandwiched between the winding 1a and the winding 1a, the coupling coefficient between the winding 1 and the windings 3 and 4 is sufficiently large.

[0006]

The present invention has the following effects because it is constructed and operates as described above. Winding 1 requiring high insulation
Is divided into two, and the other divided winding 1b is wound on the winding frame 6 in the upper layer of the windings 3, 4, ...
Since the winding is performed in multiple layers with the winding width W3 being equal to or less than the winding width W3, the creeping distance L between the outer edges of the windings can be secured to enhance the insulation. Further, between the windings 3, 4, ... And the other split winding 1b, the second inter-wire insulating layer 12 which is a film thinner than that of the winding frame is only interposed, and the other one. Since the windings 3, 4, ... Are sandwiched between the divided winding 1b and one divided winding 1a wound around the winding frame 5,
The coupling coefficient between the winding 1 and the windings 3, 4, ... Can be made sufficiently large. As a result, the insulation between the high-insulation windings of the small transformer and the coupling coefficient are both achieved, and the man-hours are reduced without compromising the characteristics while maintaining the required creepage distance between the windings, reducing the manufacturing cost. Can be made.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 (A) is an enlarged side view of a broken portion of a main part of a small transformer, FIG.
(B) is an assembly procedure diagram of the magnetic core and the winding of the same transformer, FIG.
(C) is an electric circuit diagram of the same transformer. In the figure, the small transformer comprises a plurality of windings 1, 2, 3, 4, ..., A plurality of winding frames 5, 6 for winding the respective windings 1, 2, 3, 4 ,. · A pair of magnetic cores 7 and 8 which surrounds 2, 3 and 4 and are combined with each other to form a closed magnetic circuit.
The winding frame 5 has the inner iron portion 7 of the pair of magnetic cores 7 and 8.
a. 8a is formed so that it can be inserted and fitted, and the winding frame 6 is formed so that the winding frame 5 can be inserted and fitted. Reference numeral 20 is a terminal portion 21 formed integrally with the reel 5.
Is a lead-out connection terminal provided in the. In the small transformer, the winding 1 requiring high insulation among the plurality of windings 1, 2, 3, 4, ... Is divided into two, and one of the divided windings 1a is wound around the winding frame 5. There is. Further, the collar portion 9 of the winding frame 6 is formed by a thick portion 9a on the inner diameter side and a thin portion 9b in which the inner thickness on the outer diameter side of the thick portion 9a is reduced. And the reel 6
Of the plurality of windings 1, 2, 3, 4, ... In a narrow space 10a surrounded by the thick portion 9a of the space 10 formed by the bottom 6a of the winding frame and the collar 9. The wires 3, 4, ... Between the respective windings, for example, the first wire insulating layer 1 such as a PET film.
1 is interposed and wound in order. Further, in the wide space 10b surrounded by the thin portion 9b of the collar portion 9, P of the width of the wide space 10b is filled in the upper layer of the windings 3, 4 ...
While interposing a second inter-layer insulating layer 12 such as an ET film, the other split winding 1b of the winding 1 is formed of, for example, PE.
It is wound in multiple layers with an interlayer insulating layer 13 such as a T-composite film interposed. Further, the winding width W1 of the other divided winding 1b is formed to be equal to or smaller than the winding width W3 of the windings 3, 4, ... Then, the inner iron portions 7a and 8a of the pair of magnetic cores 7 and 8 are inserted and fitted into the winding frame 5, and the winding frame 5 is inserted and fitted into the winding frame 6 so as to be combined with each other. There is. The winding 2 is wound on the upper layers of the windings 3, 4, ... In the same layer as the other divided winding 1b of the winding 1 in the same manner.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 (A) is an enlarged side view of a broken portion of a small transformer, FIG. 1 (B) is an assembly procedure diagram of a magnetic core and a winding of the transformer, FIG. 1C is an electric circuit diagram of the transformer.

FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

1, 2, 3, 4, ... windings, 1a, 1b, split windings, 5, 6 ...
Reel, 6a ... Reel bottom, 7.8 ... Magnetic core, 7a / 8a ... Inner iron part, 9 ... Collar part, 9a ... Thick part, 9b ... Thin part, 10 ...
Space, 10a ... Narrow space, 10b ... Wide space, 11 ... First line insulation layer, 12 ... Second line insulation layer, 13 ... Interlayer insulation layer, W1, W3 ... Winding width.

Claims (1)

[Claims] 1. A plurality of windings (1, 2, 3, 4, ...) And a plurality of reels (5, ...) For winding the respective windings (1, 2, 3, 4, ...).
6) and a pair of magnetic cores (7, 8) that surround each of the windings (1, 2, 3, 4, ...) And combine with each other to form a closed magnetic circuit. Inner iron part (7a) of the magnetic core (7.8)
8a) is formed so that it can be inserted and fitted, and
(6) is a small-sized transformer formed by inserting the winding frame (5) so that the winding (5) can be inserted and fitted, and the winding (1) of the plurality of windings (1, 2, 3, 4, ...) Is It is divided into two, and one of the divided windings (1a) is the winding frame (5).
The flange portion (9) of the winding frame (6), and the thin wall portion (9b) in which the inner wall portion on the outer diameter side of the thick wall portion (9a) and the thick wall portion (9a) is reduced.
And a narrow space surrounded by the thick portion (9a) of the space (10) formed by the bottom (6a) of the reel and the collar (9) of the reel (6).
The windings (3.4, ...) Of the plurality of windings (1, 2, 3, 4, ...) Are provided in (10a), and a first inter-wire insulation layer is provided between the windings.
A wide space (10) surrounded by the thin-walled portion (9b) of the collar portion (9) is wound in order with the (11) interposed.
In b), the wide space (1
0b) the second inter-wire insulation layer (12) having the full width is interposed, and the other divided winding (1b) of the winding (1) is wound in multiple layers with the interlayer insulation layer (13) interposed. The winding width (W1) of the other split winding (1b) is the same as that of the winding (3
.4 ...) and the same width as the winding width (W3), and the inner iron portions (7a, 8a) of the pair of magnetic cores (7, 8) are inserted and fitted into the winding frame (5). A small transformer, characterized in that the winding frame (5) is inserted and fitted into the winding frame (6) and combined with each other.