JP3329173B2 - Multilayer transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated transformer using a laminated coil used for various electronic devices.

[0002]

2. Description of the Related Art In recent years, in order to meet the technical needs of higher frequency, smaller size, thinner, and higher performance transformers, printed coil laminated transformers using print etching technology, punched coils formed by punching copper plates. Transformers with a laminated configuration, transformers with a spiral coil laminated configuration in which electric wires are formed in a spiral shape, and the like have been developed.

[0003] Further, demands for thinner, higher performance, and lower cost are also increasing in equipment such as a power supply device using the above-mentioned laminated transformer, and a transformer is a key part of differentiating these electronic equipment. It is not an exaggeration to say.

[0004] In order to provide a thin transformer at low cost, it is necessary to determine what kind of laminated coil and how to construct it. However, a printed coil formed by an etching method requires a large current capacity in terms of cost increase and thick film. Considering the cost and versatility of the transformer due to the limitation of the transformer, a transformer having a spiral coil laminated structure in which a coil or an electric wire is formed in a spiral shape by a punching method is generally used.

[0005] Hereinafter, the layer transformer will be described with reference to FIGS. 8-9 using a conventional spiral coil.

FIG. 8 is a sectional view of a conventional thin laminated transformer, and FIG. 9 is an exploded perspective view of the same. In the figure, 1
Is a magnetic core, 2 is a spiral coil, 2a is a lead wire of the spiral coil 2, 3 is insulating paper, 4 is a coil base having a center core guide wall 4b through which a magnetic leg of the magnetic core 1 passes in the center, and 5 is a coil. The holding cover 6 is a step portion of the spiral coil caused by the thickness of the lead wire.

Next, the assembling procedure will be described. The spiral coil 2 formed by spirally winding an electric wire alone and the insulating paper 3 are alternately laminated on the coil base 4, and then the spiral coil 2 is formed from the upper surface. And a coil holding cover 5 having a surface opposed to the above, the laminated coil is completed, and the magnetic core 1 constituting a closed magnetic path is assembled from the direction in which the coils are laminated to complete a thin laminated transformer main body.

In the above-mentioned prior art, the spiral coils 2 are alternately stacked.
Is used as the primary winding of the multilayer transformer, and if any of the secondary windings is used as the secondary winding, the multilayer transformer is configured. Therefore, it is sufficient that two or more spiral coils 2 are provided.

[0009]

However, in the above configuration, since the spiral coil 2 has the lead wires 2a drawn out on the inner and outer peripheral portions, the spiral coil 2 has a spiral shape depending on the thickness of the lead wires 2a when the coils 2 are stacked. A step 6 occurs on the coil surface. The step 6 changes the thickness in the stacking direction between the spiral coils 2 and causes a change in coupling between the windings. When incorporated into a power supply device, variations in input / output regulation characteristics and the like occur. The number of layers of the spiral coil 2 is limited.

The present invention has been made to solve the above-mentioned problems. Even when windings using spiral coils are stacked, an adverse effect due to a change in the stacking thickness due to the thickness of the lead wire is improved, and the electrical performance is stabilized. It is intended to provide a thin laminated transformer.

[0011]

In order to solve the above-mentioned problems, a laminated transformer according to the present invention comprises a central core through which a magnetic core passes through a central portion.
A coil base having an id wall, and
Pull out the lead wires from the inner and outer peripheral parts and insulate them
Spiral coil wound in two or more layers via paper
And the coil pusher over the stacked spiral coil
Even forming a laminated coil with the cover and pulling it out
The lead wire at the bottom of the laminated coil, at least
Connect to either side and at least
Touch the coil holding cover or the coil base
Of the above-mentioned lead wire provided at the
A lead wiring portion comprising a concave portion having a depth corresponding to the thickness,
Thin the outer part of the part where this lead wire wiring part is not
At least the coil holding cover or the
From the top and bottom with the step formed on one of the
And a magnetic core forming a closed magnetic circuit .

[0012] According to the above configuration, since the step portion generated by the influence of the thickness of the lead wire is filled, the thickness of the spiral coil in the laminating direction does not change, the coil lamination thickness is stabilized, and the laminated transformer has stable electric performance. Can be provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
Coil base with central core guide wall for passing magnetic core through center
And lead out from the inner and outer circumferences on this coil base
Spiral with two or more layers drawn out and laminated via insulating paper
Spiral coil and the laminated spiral coil
A laminated coil is formed with the coil holding cover placed on the
The lead wire to the bottom of the laminated coil
Layer and / or top layer.
Coil press cover that contacts the above-mentioned lead wire
Or any of the above coil bases
Or a recess with a depth equivalent to the thickness of the lead wire
And the lead wiring section
Thin the outer part of the part that is not
Formed on the holding cover or any of the above coil bases
And a magnetic core that constitutes a closed magnetic circuit from above and below
And the thickness of the step
Stacking transformer for the depth of the recess corresponding to the thickness of the lead wire
Can be made thinner.

[0014] The second aspect of the present invention is the first aspect.
In addition to the configuration described, the product
Spiral caused by thickness of lead wire pulling out layer coil
The thickness in the height direction of the above-mentioned lead wire at the step of the coil
A height adjustment spacer with a thickness almost equal to the thickness is inserted
Where the lead wire section is used.
Since no adjusting spacer is required, the coil lamination thickness is low.
The electrical performance is stable and the
It can be made thinner.

[0015] The invention according to claim 3 of the present invention is claimed in claim 1
In addition to the configuration described, a coil base and coil
The magnetic core back only on the lower side of the outer surface of the
It incorporates a flat magnetic core with
The back of the magnetic core is the coil base and coil holding cover.
Because it is provided only on the lower surface side of the outer surface ,
A laminated transformer can be provided.

[0016] Figure 1 for an embodiment of the following Shitahon invention
It will be described with reference to FIG. The same parts as in the prior art are denoted by the same reference numerals, and description thereof will be omitted.

Embodiment 1 FIG. 1 is a sectional view of a laminated transformer according to an embodiment of the present invention.
FIG. 2 is a spiral coil for explaining the configuration of the laminated transformer .
Fig. 3 is an exploded perspective view of the laminated transformer excluding the
It is a perspective view of a height adjustment spacer.

In FIG . 1, reference numeral 8a denotes a coil base 4;
A concave portion provided on the inner surface of the oil holding cover 5;
Pull out the lead wire 2a from the part and coil the wire
Spiral coil 2 formed in a spiral shape by itself and height adjustment
A core for passing the magnetic core 1 through the center of the spacer 7 and the insulating paper 3
Alternately laminated on a coil base 4 having an id wall
Then, a coil having a surface facing the spiral coil 2 from the upper surface
Complete the laminated coil with the cover 5
Incorporating the magnetic core 1 that constitutes a closed magnetic circuit from the lamination direction
This completes the laminated transformer.

Differences between the above laminated transformer and the prior art
Means that the lead wire 2a is connected to the lowermost layer,
Wiring to the layer, the coil base 4 and the coil holding cover 5
Pull out to the part where the lead wire 2a on the inner surface is wired
A recess 8a having a depth corresponding to the thickness of the lead wire 2a is provided.
And the outer surface without the concave portion 8a formed on the inner surface.
Is pulled out to the outer surface having the concave portion 8a formed on the inner surface.
It will be lower by a thickness almost equal to the thickness of the lead wire 2a.
Step h to the coil base 4 and coil holding cover 5
It is a point provided.

The height of the lead wire 2a is
Pull out the height adjustment spacer 7 with a thickness almost equal to the thickness
Step of spiral coil 2 caused by thickness of lead wire 2a
That is, it is inserted into the part 6. This height adjustment spacer 7
Is a U-shape or horseshoe shape as shown in FIGS. 3 (a) and 3 (b).
When inserted above or below the spiral coil 2, the spiral coil
2 by pulling out the lead wire 2a from the inside.
This is to fill in the stepped portion 6 caused by this.

According to the above embodiment, the lowermost layer, the uppermost layer
At a depth corresponding to the thickness of the lead wire 2a of the layer,
A recess 8a is formed in a portion where the lead wire 2a is wired.
Is provided, the lead wire 2a is connected to the recess 8 thereof.
a. Also, by providing a recess 8a
The outer surface that is not formed is formed lower by the step h and incorporates the magnetic core 1
Therefore, the length of the magnetic leg of the magnetic core 1 can be shortened by twice the length h.
And the height H of the entire laminated transformer is (2 × h)
Only lower. In other words, the bottom layer, the top layer
Twice the thickness that is almost equal to the thickness of the lead wire 2a
Only the laminated transformer can be made thinner, and the spiral coil
Thickness of the lead wire 2a, which is a problem when two are stacked
In other words, it is possible to improve the adverse effect on the thickness reduction due to the thickness.

Further , the height adjusting spacer 7
The step 6 caused by the thickness of the lead wire 2a is
Because of the filling, the change in thickness in the stacking direction between the spiral coils 2
And the coil lamination thickness becomes stable,
Stable winding connection as transformer and built into power supply
Of input / output regulation performance
Can be reduced.

Further, here, it is not shown in detail.
Has a comb-shaped protrusion on at least one end of the coil base 4 of FIG.
The raised portion 4a is formed, and the lead portion is drawn between the comb-shaped protrusion portions 4a.
Stacking the spiral coil 2 while laying out the wire 2a
Therefore, the positioning of the lead portion of the lead wire 2a is determined.
And positioning of the spiral coil 2 in the rotational direction.
Can be pulled out from the inside of the spiral coil 2
The position of the lead wire 2a does not move,
Bulge due to overlap between the sensor 7 and the lead wire 2a
Has a new effect that can be prevented.

In the above embodiment, the drawer
The wiring 2a is connected to both the lowermost layer and the uppermost layer , and
Recesses 8 in both the file base 4 and the coil holding cover 5
a and step h are provided, but either
Even if only one of them is provided,
To the thickness of one of the lead wires 2a.
It is possible to reduce the thickness of the lead wire 2a.
Basic effect of improving the negative effect on thinning due to
Needless to say, this is obtained.

(Embodiment 2) FIG. 4 shows a product of a laminated transformer according to another embodiment of the present invention.
FIG. 5 shows a spiral coil for explaining the same configuration.
It is the disassembled perspective view which removed.

In the figure, different points from the first embodiment are shown.
To explain, a coil base 4 having a step and a coil presser
On the protruding surface 8b on the outer surface of the cover 5,
A coil having no step and having a step on the magnetic core back surface 9a of the magnetic core 9
Lower side of outer surface of base 4 and coil holding cover 5
A flat type magnetic core 9 having only 4a and 5a is incorporated.
Therefore, for the width equivalent to the thickness of the center magnetic leg,
Incorporates a flat magnetic core 9 with a wide outer leg magnetic leg width and thickness
That is.

FIGS. 6 and 7 show applications of this embodiment.
This is an example, and the concave portion 8a and the magnetic core
It is a tapered shape that connects the middle leg and the outer leg.
You.

As described above, according to the present embodiment, the projecting surface 8b
This has the effect that the height of the laminated transformer can be reduced by devising the shape of the back core so as to effectively utilize the surface avoiding the above.

[0029]

As described above, according to the present invention , the magnetic core is provided at the center.
Coil base having a core guide wall through which this coil passes, and this coil
Pull out the lead wires from the inner and outer circumferences on the base
And wound in a spiral shape with two or more layers laminated via insulating paper
Spiral coil and the laminated spiral coil
To form a laminated coil with the coil holding cover
Next, connect the lead wires to the bottom and top layers of the laminated coil.
Connect at least one of them and at least the drawer
Coil holding cover or coil above
The drawer provided in any abutment part of the base
Lead wire consisting of a concave part with a depth equivalent to the thickness of the lead wire
Outside of the wiring part and the part where this lead wire wiring part is not located
Make the side part thinner and at least the coil holding cover
Or a step formed on one of the coil bases,
It consists of a magnetic core that constitutes a closed magnetic circuit built in from above and below, and the stepped portion generated by the influence of the thickness of the lead wire is filled, so that the thickness of the spiral coil in the stacking direction does not change, and the coil stacking thickness is stable. The present invention can provide a thin laminated transformer having stable electric performance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a multilayer transformer according to the present invention.

FIG. 2 shows a state in which a spiral coil for explaining the configuration is removed.
Exploded perspective view of the state

FIG. 3 (a) is a perspective view of a height adjustment spacer which is the main part, and FIG. 3 (b) is a perspective view of another height adjustment spacer which is the main part.

FIG. 4 is a cross-sectional view of another embodiment.

FIG. 5 is a diagram showing a configuration excluding a spiral coil for explaining the same configuration;
Perspective view

FIG. 6 is a sectional view of the embodiment of the application development example.

FIG. 7 shows a state excluding a spiral coil for explaining the same configuration .
Exploded perspective view of the state

FIG. 8 is a sectional view of a conventional laminated transformer.

FIG. 9 is an exploded perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Spiral coil 2a Lead wire 3 Insulating paper 4 Coil base 4a Comb-shaped projection part 5 Coil holding cover 6 Step part 7 Height adjustment spacer 8a Depression 8b Projection surface 9 Flat magnetic core 9a, 9b Back surface of magnetic core

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 27/28 H01F 27/29 H01F 30/00

Claims (3)

(57) [Claims] 1. A center core guide wall for passing a magnetic core in a central portion.
Coil base and the inner and outer circumferences on this coil base
Pull out the lead wires and insert them through insulating paper.
A spiral coil wound in a spiral shape with at least
A coil holding cover over the spiral coil
To form a laminated coil,
Arrange at least one of the bottom layer and the top layer of the laminated coil
A coil that is in contact with at least the lead wire
Pressing cover or any of the above coil bases
Equivalent to the thickness of the lead wire provided on the
Lead wire portion consisting of a concave part having a depth of
Thin the outer part where the wiring part is not located to reduce
Both of the above coil holding cover or the above coil base
Step formed on either side and closed magnetic circuit incorporated from above and below
And a magnetic transformer. 2. It is caused by the thickness of the lead wire.
At the step of the spiral coil, the thickness of the lead wire
2. A height adjusting spacer having a substantially equal thickness is inserted.
The laminated transformer as described. 3. A coil base having a step and a coil presser.
Do not have a magnetic core back on the protruding surface of the outer surface of the cover
Wide outer leg magnet for width equivalent to the thickness of the central magnetic leg
The laminated transformer according to claim 1, wherein a flat magnetic core having a leg width thickness is incorporated .