JPH0786059A - Converter transformer - Google Patents

Abstract

PURPOSE:To provide a converter transformer, which has little leakage magnetic flux, is good in winding properties, is high in efficiency, is small-sized and is thin, in high quality and at low cost. CONSTITUTION:Multi-parallel conductor wires, which are wholly covered with a singular number or a plurality of insulating layers 4, are used as a primary coil 2, whereby as excess insulation among strands of the multi-parallel conductor wires is removed, a converter transformer, which reduces the material cost for the conductor wires, improves the space factor of the conductor wires in the coils, decreases a leakage magnetic flux, eliminates a disarranged winding of the conductor wires, increases a coupling of making a winding execute easily, is high in efficiency, is small-sized and is thin, is provided in high quality and at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter transformer used in various video equipment, industrial equipment and the like.

[0002]

2. Description of the Related Art In recent years, there has been an active trend toward miniaturization of electronic equipment, and among them, there is a strong demand for miniaturization and thinning of a power source portion which occupies a large volume. One of the adverse effects is the insulation distance between the primary and secondary sides in the converter transformer. Therefore, the insulation distance is alleviated by using a three-layer insulated conductor or performing resin casting.

A conventional converter transformer using a three-layer insulated conductor will be described below. FIG. 6 is a sectional view showing the structure of a conventional converter transformer. In FIG. 6, 1 is a closed magnetic circuit core, 1a is a central magnetic leg, 2 is a primary coil, 3
Is a secondary coil. The structure will be described below. A primary coil 2 formed by winding three three-layer insulated conductors on the same plane.
The secondary coil 3 is incorporated in the central magnetic leg 1a of the closed magnetic circuit magnetic core 1.

The converter transformer configured as described above has the advantage that the insulating tape and the insulating space required for the safety standard can be eliminated because the primary coil 2 uses the three-layer insulated conducting wire. Have

[0005]

However, in the above-mentioned conventional configuration, excessive insulation is provided between the wires of the primary coil 2, and (1) there is a large amount of leakage magnetic flux. (2) The material cost of the conductor is high. (3) The space factor of the conductor in the coil is low. There is also a problem that the winding property is deteriorated or winding is difficult due to winding a large number of conductor wires in parallel.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to provide a high-efficiency, small-sized, thin-type converter transformer having a small magnetic flux leakage, a good winding property, a high quality, and a low cost. To do.

[0007]

In order to achieve this object, the converter transformer of the present invention uses, as at least one coil, a plurality of parallel conductor wires which are entirely covered with an insulating layer or layers. This is a structure in which a magnetic core is incorporated in a coil portion composed of a coil.

[0008]

With this structure, the insulation required for the safety standard is not formed on each strand of the multiple parallel conductors, but the insulation required for the safety standard is formed for the entire multiple parallel conductors. , The material cost of the conductor is reduced because the excess insulation between the strands of the multiple parallel conductors is removed without impairing the conventional advantages, the space factor of the conductor in the coil is improved, and further Since the average distance is shortened, the leakage magnetic flux is reduced. In addition, since the conductors are bundled on the same plane by the insulating layer, winding is not disturbed and winding is easy. Therefore, it is possible to provide a high-quality, low-cost converter transformer with high coupling, high efficiency, small size, and thin shape.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a structure of a converter transformer according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conductor wire used for a primary coil 2 in the embodiment. In FIG. 1, basically, the same components as those in the conventional example shown in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted. In FIGS. 2A to 2C, 4 is an insulating layer, 5 is a conductor, and an example of a conductor wire in which a large number of conductors 5 are connected in parallel on the same plane and the whole is covered with a single or a plurality of insulating layers 4 is shown. Shows. The configuration will be described below with reference to FIG. 1, which is different from the conventional example shown in FIG. 6 in that the primary coil 2 is constructed by using multiple parallel conductor wires whose whole is covered with one or more insulating layers as shown in FIG. It is a point.

As described above, according to this embodiment, the insulation required for the safety standard is not applied to each of the strands of the multi-parallel conductor, but the insulation required for the safety standard for the entire multi-parallel conductor. The formation of the wires eliminates the excess insulation between the strands of multiple parallel conductors without compromising the conventional advantages, thus reducing the material cost of the conductors and the space factor of the conductors in the coil. And the average distance between the coils is shortened, so that the leakage magnetic flux is reduced. In addition, since the conductors are bundled on the same plane by the insulating layer, winding is not disturbed and winding is easy. Therefore, it is possible to provide a high-quality, low-cost converter transformer with high coupling, high efficiency, small size, and thin shape.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. 3 and 4 are sectional views showing the structure of the converter transformer according to the second embodiment of the present invention. FIG. 3 shows the primary coil 2 with the central magnetic leg 1
The coil is wound in the direction perpendicular to a, and in FIG. 4, the primary coil 2 is wound in the direction horizontal to the central magnetic leg 1a. 3 and 4, the same components as those of the conventional example shown in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted. The difference from the configuration of the first embodiment shown in FIG. 1 is that a primary coil 2 is constructed by winding multiple parallel conductor wires as shown in FIG. 2 so that the wide direction is orthogonal to the winding direction. .

As described above, according to this embodiment, the first embodiment
In addition to the effects of, the following effects are obtained.

Since the winding width can be shortened, it is easy to form the primary coil 2 in a single layer, and (1) the leakage magnetic flux can be further reduced. (2) The winding is further facilitated, the bobbin-less structure and each wire ring can be separately manufactured, and the coils can be stacked to simplify the manufacturing process.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a sectional view showing the structure of the converter transformer according to the third embodiment of the present invention. In FIG. 5, reference numeral 6 denotes a shield coil, and the same components as those of the conventional example shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted here. Figure 5
3 is substantially the same as that of the second embodiment shown in FIG. 3, except that it is the most secondary coil of multiple parallel conductors used for the primary coil 2 and entirely covered with one or more insulating layers. That is, the conductor 5 close to 3 is used as the shield coil 6. However, in this case, insulation between the strands of the multiple parallel conductors is required to withstand a potential difference generated between the primary coil 2 and the shield coil 6. Therefore, the case (b) of the conducting wire used for the primary coil 2 shown in FIG. 2 cannot be used inevitably.

As described above, according to the present embodiment, the conventional problem that the deterioration tends to occur when the shield coil 6 is inserted is due to the excessive insulation between the primary coil 2 and the shield coil 6. By excluding it, the same effect as that of the first embodiment can be obtained without impairing the advantage of the shield coil 6.

The primary coil 2 is used in all the examples.
Although the three-layer insulated conducting wire is used in the above, the same effect can be obtained by using it in the secondary coil 3. In addition, it goes without saying that, in place of the shield coil 6 in the third embodiment, any coil that uses a three-layer insulated conductor such as a snubber circuit coil or a forward converter reset coil can be used. .

[0017]

As described above, in the converter transformer of the present invention, the primary coil is wound by using the multiple parallel conductors which are entirely covered with a single or a plurality of insulating layers. (1) Material cost of the conductors Is reduced. (2) The space factor of the conductive wire in the coil is improved. (3) The leakage magnetic flux is reduced. (4) There is no winding disorder and winding is easy.

Further, by winding the multiple parallel conductors so that the wide direction is orthogonal to the winding direction to form the primary coil, (5) the leakage magnetic flux can be further reduced. (6) The winding is further facilitated, the bobbin-less structure and each coil can be separately manufactured, and the coils can be stacked to simplify the manufacturing process.

Furthermore, by utilizing at least one conductor of the multiple parallel conductors as a coil different from other conductors, (7) without detracting from the advantage of the shield coil,
The same effect as (6) can be obtained.

As described above, a great effect can be obtained. Therefore, it is possible to provide a high-coupling, high-efficiency, small-sized and thin converter transformer with high quality and at low cost, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a converter transformer according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a conductive wire used for the primary coil in the example.

FIG. 3 is a sectional view showing a structure of a converter transformer according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a structure of a converter transformer according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing the structure of a converter transformer according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing a structure of a conventional converter transformer.

[Explanation of symbols]

 1 Closed magnetic circuit magnetic core 1a Central magnetic leg 2 Primary coil 3 Secondary coil 4 Insulating layer 5 Conductor 6 Shield coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Soukei Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A multi-parallel conductor wire, which is entirely covered with a single insulating layer or a plurality of insulating layers, is used as at least one coil.
A converter transformer in which a magnetic core is incorporated in a coil section composed of three or more coils. 2. The converter transformer according to claim 1, wherein the multiple parallel conductors are wound so that the wide direction is orthogonal to the winding direction. 3. The converter transformer according to claim 1, wherein at least one conductor of the multiple parallel conductors is used as a coil different from other conductors.