JPS6322045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an isolated inductance device used, for example, in a switching regulator of an amplifier.

Generally, a transformer, which is a type of inductance device, consists of a core 1 made of metal or ferrite, etc., and a bobbin 2 attached to this core 1, as shown in Figure 1.
The winding 3 is wound on the bobbin 2 along the flanges 2a and 2b, and is used, for example, in a switching regulator circuit 4 as shown in FIG. The switching regulator circuit 4 shown in FIG. A transformer 10 having a primary winding 11, a secondary winding 12, and a tertiary winding 13 arranged, and the primary winding 11 and the tertiary winding 13 of this transformer 10. and a driver circuit 14 connected to each other.

By the way, the conventional transformer 10 used in such a switching regulator circuit 4 is as follows.
Generally, it has a winding structure as shown in FIG. 3, for example.

That is, the conventional transformer 10 generally has a core 1
The tertiary winding 13 is sequentially placed on the bobbin 2 mounted on the
the first winding 13a, the insulating material 14, the first divided winding 11a forming the primary winding 11, the electrostatic shielding winding 15, the insulating material 16, and the secondary winding 12. the first winding 12a, the insulating material 17, the second windings 12b of the secondary winding 12, the insulating material 18, the electrostatic shield winding 19, the second
divided winding 11b, insulating material 20, tertiary winding 13
The second winding 13b has a winding structure in which the insulating material 21 is wound overlappingly.

In addition, each of such windings 11a, 11b, 12
The first to twelfth lead wires 22 to 33, two each drawn out from the start and end ends of the wires a, 12b, 13a and 13b, are connected to respective predetermined terminals 22a to 33a in the switching regulator circuit 4.
connected to.

That is, among the first and second lead wires 22 and 23 drawn out from the first winding 11a constituting the primary winding 11, the first lead wire 22
is connected to a terminal 22a connected to the rectifier circuit 6, and the second lead wire 23 is connected to a second terminal 23a.

In addition, a second winding 11 constituting the primary winding 11
Of the first and second lead lines 24 and 25 drawn out from b, the first lead line 24
This third terminal 24a is connected to the terminal 24a of
and the above-mentioned second terminal 23a are connected in series. The second lead line 25 is connected to an NPN transistor 34 connected to the driver circuit 14.
connected to the collector side of the

On the other hand, the first winding 1 constituting the secondary winding 12
Of the first and second lead lines 26 and 27 drawn out from 2a, the first lead line 26 is
The fifth terminal 26a is connected to the output terminal 7, and the second lead line 27 is connected to the sixth terminal 27a, which is connected to the output terminal 8.

In addition, a second winding 12 constituting the secondary winding 12
Of the first and second lead lines 28 and 29 drawn out from b, the first lead line 28
The second lead wire 29 is connected to the eighth terminal 28a, and the second lead wire 29 is connected to the eighth terminal 29a.

Furthermore, the first winding 1 constituting the tertiary winding 13
Of the first and second lead lines 30 and 31 drawn out from 3a, the first lead line 30 is
Diode 35 connected to driver circuit 14
The second lead line 31 is connected to a ninth terminal 30a connected to the driver circuit 14. Further, among the first and second lead wires 32 and 33 drawn out from the second winding 13b constituting the tertiary winding 13, the first lead wire 32 is the first lead wire 32 connected to the driver circuit 14. 11 terminals 32
a, and the second lead line 33 is connected to a diode 36 in the driver circuit 14.

The reason for adopting such a winding structure is to increase the degree of coupling between the primary winding 11 and the secondary winding 12. According to such a winding structure,
Each of the first and second windings 12a of the secondary winding 12,
12b, that is, outside the first and second windings 12a, 12b, the first and second divided windings 11a, 12b of the high potential primary winding 11,
11b, there is a drawback that noise from the primary winding 11 is easily transmitted to the secondary winding 12. Therefore, as shown in FIG. 3, between the first divided winding 11a of the primary winding 11 and the first winding 12a of the secondary winding 12, A winding 1 for electrostatic shielding is connected between the second divided winding 11b and the second winding 12b of the secondary winding 12.
5 and 19 are arranged to prevent noise from being transmitted from the primary winding 11 to the secondary winding 12. However, intervening the shield windings 15 and 19 inevitably increases the number of windings by the number of windings of the shield windings 15 and 19. In order to secure the lead parts drawn out from the windings 15 and 19 to the flange of the bobbin, it is extremely necessary to attach a shielding pin and to solder the lead part to the shielding pin. It was a hassle.

In addition, each winding 1 on the primary side, secondary side and tertiary side
1, 12, and 13 are constructed by winding a rod-shaped winding X in a single layer or in multiple layers as shown in FIG. 6. For example, as shown in FIG.
Even if you try to roll the second layer 9 times in the same way,
In order to wind the winding X in a stable state, it may be necessary to wind it in the recess between the adjacent windings X at the bottom, so only the last winding X should be wound in the third layer. There are times when you have to. In such a case, it is not possible to wrap the insulating material Y and other windings Z around this winding X in an orderly manner and with a high density without any gaps, and therefore it is not possible to achieve miniaturization, stabilization, etc. It was not possible to provide an inductance device.

The present invention has been devised in view of these conventional drawbacks.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is an enlarged view of a main part of an embodiment of an insulated inductance device according to the present invention.

As shown in FIG. 4, the insulated inductance device according to the present invention has a multilayer structure in which windings are sequentially wound in layers on the outer peripheral surface of a bobbin 51 as a winding frame having a core 50 made of metal or ferrite. are doing.

That is, on the bobbin 51, one first divided winding (hereinafter referred to as the first divided winding for primary winding) 52a, which is configured by sequentially dividing the primary winding into two,
The first winding (hereinafter referred to as
A first winding forming one of the secondary windings (hereinafter referred to as the first winding for secondary windings) 54a, a secondary winding (referred to as the first winding for the secondary winding) 53a, The second winding that constitutes the other side of the wire (hereinafter referred to as the second winding for secondary winding)
A second winding (hereinafter referred to as a second winding for tertiary winding) 53b, which constitutes the other side of the tertiary winding (hereinafter referred to as a second winding for tertiary winding) 53b, is constructed by dividing the primary winding into two. The other second divided winding (hereinafter referred to as the second divided winding for the primary winding)
(referred to as divided windings) 52b, and each of these windings 52a, 53a, 54a, 54
It has a winding structure in which insulating layers 55 to 60 are interposed and wound between b, 53b, and 52b and on the outermost periphery, respectively.

Each of the above-mentioned windings, that is, the first and second windings 52a and 52b for the primary winding, the first and second windings 53a and 53b for the tertiary winding, and the secondary winding At the starting end and the ending end of each of the first and second windings 54a and 54b, there are two first and second windings, respectively.
Each lead line 61 to 72 is drawn out, and each of these lead lines 61 to 72 connects to the switching regulator circuit 4 shown in FIG.
Each of the first to twelfth terminals 22a to 33a in
It is connected to the.

Each of these windings 52a, 52b, 53a, 53
b, 54a, and 54b are each made by winding a rod-shaped winding X many times to form a single layer or multiple layers, and among these, the first and second windings for the tertiary side winding
Each winding 54a, 54b has a structure as shown in FIG.

That is, as shown in FIG. 5, the first winding 54a for the tertiary winding has, for example, 9 turns in the first layer, 8 turns in the second layer, and the last layer of the second layer on top of the second layer. Foil material 7 electrically connected to the winding corresponding to the ninth winding
It consists of 3 wrapped around each other. In addition, the foil material 73
A lead wire 70 drawn out to the outside is connected to the tenth terminal 31a in the switching regulator 4 and connected to the ground on the primary side. Although not shown, the second winding 54b for the tertiary winding has a similar structure, and the lead wire 71 from the foil material is connected to the eleventh terminal 3 in the switching regulator 4.
2a and to the ground on the primary side.

In this way, in the present invention, between the first divided winding 52a for the primary winding and the first winding 54a for the secondary winding, and between the second winding 54b for the secondary winding and the primary First and second windings 53a, 53b for tertiary windings are interposed between the second divided winding 52b for side windings, and these windings 53a, 53
The outermost circumference or the innermost circumference of b (in this example, 2
Each of the first and second windings 54a, 54 for the next winding
Since at least one turn of the winding located on the b side) is made of foil material 73, 73, this foil material 73, 73 serves as the first divided winding 52a for the primary winding and the first divided winding 52a for the secondary winding. This acts to provide electrostatic shielding between the first winding 54a and between the second winding 54b for the secondary winding and the second divided winding 52b for the primary winding. For this reason, the first and second divided windings 52a, 5 for the primary winding have a high potential with respect to the first and second windings 54a, 54b for the secondary winding.
Noise from 2b is not transmitted to each of the first and second windings 54a and 54b for the secondary winding, and therefore an inductance device with stable characteristics can be ensured.

Further, in the present invention, the first and second windings for the tertiary winding
One turn of the winding located at the outermost or innermost of the windings 53a and 53b is connected to the flat foil material 7.
3 and 73, and the foil materials 73 and 73 are wound around the outer peripheral surface of the bobbin 51, so that it is possible to prevent the winding X from becoming loose, and
The winding X can be wound in multiple layers in an orderly and high-density state.

Although this embodiment shows an example in which the foil material 73 is used only for the tertiary winding 13, the foil material 73 is not limited to this example. The structure may be similar to that shown in FIG. 5 described above using the material 73.

As is clear from the above description, the present invention has the following features:
A tertiary winding is interposed between the next winding and the secondary winding, and at least one turn of the tertiary winding is located at the outermost or innermost periphery of the tertiary winding. Since the wire is made of foil material, this foil material can provide electrostatic shielding between the primary winding and the secondary winding, and therefore the secondary winding from the primary winding can be shielded from electricity. It is possible to prevent noise from being transmitted to.

Further, in the present invention, since one turn of the winding located at the outermost or innermost periphery of the tertiary winding is made of foil material, the winding can be wound in multiple layers in a high-density state.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a conventional inductance device, and FIG. 2 is a circuit diagram showing an example of a commonly used switching regulator circuit.
FIG. 3 is an enlarged sectional view showing the main part of the winding structure of a conventional inductance device. FIG. 4 is an enlarged cross-sectional view of a main part showing the winding structure of the inductance device of the present invention, FIG. 5 is a cross-sectional view further showing an enlarged main part of the winding structure of each winding, and FIG. FIG. 2 is an enlarged cross-sectional view showing a main part of a wire winding structure. 50...Core, 51...Bobbin, 52a, 52
b...First and second windings for the primary winding, 54
a, 54b...First and second windings for the secondary winding, 53a, 53b...First and second windings for the tertiary winding, 73...Foil material.

Claims (1)

[Scope of Claims] 1. A bobbin in which primary, secondary and tertiary windings each having first and second divided windings are wound, wherein the primary winding between the first divided winding for the secondary winding and the first divided winding for the secondary winding, and between the second divided winding for the secondary winding and the second divided winding for the primary winding. The first and second divided windings for the tertiary winding are respectively disposed in the tertiary windings, and at least one winding located at the outermost or innermost circumference of each of the tertiary divided windings. is used as a foil material, and this foil material allows the connection between the first divided winding for the primary winding and the first divided winding for the secondary winding, and between the second divided winding for the secondary winding and the first divided winding for the secondary winding. An inductance device characterized in that electrostatic shielding is provided between each of the second divided windings for the next winding.