JPH05217771A - Transformer - Google Patents

Abstract

PURPOSE:To reduce the sizes and weight of a transformer while increasing the transformation ratio or the current transformation ratio, reduce the sizes and weight of a high-frequency device, etc., which uses the transformer and provide the transformer suitable for mounting the high-frequency heating device, etc., on manipulator devices. CONSTITUTION:A primary side is permitted to be a coil 1 and a secondary side is permitted to be a plate 2. To be concrete, the secondary side plate 2 is formed in tube-shape along the inner circumference of the primary side coil 1 permitting the leg 3a of an iron core 3 to be inserted into the inner circumference of the plate 2 and a slit 2b is provided. The primary side coil 1 is surrounded by the extending part of the secondary side plate 2 (a side wall 20, a bottom 21, a cover 2) and an output terminal member 4 is arranged on the extending part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a transformer used in a high frequency heating device or the like.

[0002]

2. Description of the Related Art As is well known, a transformer is used for obtaining a voltage difference or a current difference between a primary side and a secondary side. For this reason, in the conventional transformer, it is necessary to increase the ratio of the number of turns of the coil on the primary side to the number of turns of the coil on the secondary side as much as possible.

However, if the ratio of the number of turns between the two becomes extremely large, for example, a large amount of heat will be generated in the secondary coil, and in order to deal with overheating of the secondary coil due to this heat generation. Therefore, it is necessary to increase the diameter of the secondary coil.

On the other hand, if the diameter of the coil on the secondary side is increased, it is necessary to increase the diameter of the coil on the primary side accordingly. As a result, in the conventional transformer, the transformer ratio or the current transformation is changed. If the ratio is set to be as large as possible, it tends to cause an increase in overall weight and an increase in overall size, which makes it difficult to reduce the weight and reduce the size.

Further, when a large amount of heat is generated in the secondary coil, it is necessary to provide a cooling means to cope with this heat generation. Conventionally, the entire coil including the primary coil is immersed in oil. It is said that the coil is put in a state or the coil is water-cooled from the inside, which also makes it difficult to reduce the weight and the size of the conventional transformer.

Therefore, according to the above-mentioned conventional transformer, it is not possible to reduce the weight and size of the transformer while increasing the transformation ratio or the current transformation ratio. Therefore, this type of transformer is used, for example, a high frequency heating device or the like. However, in reality, it is impossible to mount the high-frequency heating device and the like on manipulator devices, for example.

The present invention was devised in view of the above-mentioned circumstances, and an object thereof is to make it possible to reduce the size and weight while increasing the transformation ratio or the current transformation ratio. A transformer that uses a transformer, for example, realizes a reduction in size and weight of a high-frequency heating device, and further, provides a new optimum transformer that enables the high-frequency heating device and the like to be mounted in, for example, manipulator devices. Is to provide.

[0008]

In order to achieve the above object, the structure of the transformer according to the present invention is such that the primary side is a coil and the secondary side is a plate. In addition, the secondary side plate is formed in a tubular shape along the inner circumference of the primary side coil to allow insertion of the iron core leg on the inner peripheral side and has a split. Further, the coil on the primary side is surrounded by the extension of the plate on the secondary side, and the output terminal member is disposed on the extension.

[0009]

Therefore, a predetermined magnetic field is generated between the coil on the primary side and the plate on the secondary side.

In this case, since the secondary side plate is arranged along the inner circumference of the primary side coil, leakage of magnetic flux on the inner circumference side of the primary side coil is eliminated, and in particular, the secondary side When the side plate surrounds the primary side coil, leakage of magnetic flux on the outer peripheral side of the primary side coil is also eliminated.

Further, since the secondary side is a plate, the heat resistance is improved and the heat dissipation effect is excellent. Particularly, when the secondary side plate surrounds the primary side coil, the secondary side is used. The heat radiation area on the side is further increased, and the heat radiation effect is enhanced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

As shown in FIG. 1, a transformer according to an embodiment of the present invention includes a coil 1 on the primary side and a plate 2 on the secondary side.
As a general rule, it has a pair of iron cores 3 and a pair of output terminal members 4.

The coil 1 on the primary side is formed by winding an arbitrary number of times like the coil on the primary side in a conventional transformer, and is electrically connected to two input terminals (not shown). It has terminal connection parts 1u and 1v.

In the illustrated example, the coil 1 on the primary side is wound so as to have an elliptical planar shape, but instead of this, it is substantially circular as in a conventional transformer. It may be formed by winding so as to exhibit a planar shape of.

On the other hand, in this embodiment, the secondary side plate 2 is formed in a cylindrical shape having a rectangular plane shape along the inner circumference of the primary side coil 1, and its The legs 3a of the iron core 3 can be inserted into the inner peripheral side.

The plate 2 on the secondary side has a front face portion 2 of its peripheral wall.
It is assumed that a has a split 2b extending in the vertical direction, and by having the split 2b, an output terminal can be formed.

By the way, in this embodiment, the plate 2 on the secondary side surrounds the coil 1 on the primary side.

That is, the plate 2 on the secondary side is electrically connected to the side wall 20 surrounding the side of the coil 1 on the primary side from the outer peripheral side, and the lower end of the side wall 20 and the lower end of the plate 2. A bottom portion 21 and a lid portion 22 electrically connected to the upper ends of the side wall portion 20 and the plate 2 respectively.

The side wall portion 20 is formed so as to have a square U-shape in the plan view in this embodiment so as to substantially match the plan shape of the coil 1 on the primary side. The front side, which is the so-called free end side, has the opening 2
0a to allow the pair of output terminal members 4 to be electrically connected to the opening 20.

Further, the side wall portion 20 in this embodiment has a notch 2 at the upper end of the central portion 20b which is the back side thereof.
0c, and the cutout portion 20c serves as an insertion portion of the input terminal connection portions 1u and 1v of the primary side coil 1.

The bottom portion 21 and the lid portion 22 are arranged so as to form a so-called housing for shielding the primary side coil 1 from the outside together with the side wall portion 20 and the pair of output terminal members 4. It is something.

The bottom portion 21 and the lid portion 22 secure the split 2b in the secondary side plate 2,
Each has splits 21a and 22a, and the output terminal member 4 is also arranged in a separated state so as to secure the splits 21a and 22a.

In this embodiment, the iron core 3 is an E-shaped iron core consisting of a pair of upper and lower parts, and in particular, in this embodiment, it is made of a ferrite resin.

When the iron core 3 is made of ferrite resin, the weight of the iron core 3 itself can be significantly reduced, which contributes to a significant reduction in the overall weight of the transformer.

Since the transformer according to the present invention is formed as described above, a predetermined magnetic field is generated between the coil 1 on the primary side and the plate 2 on the secondary side.

In this case, since the plate 2 on the secondary side is arranged along the inner circumference of the coil 1 on the primary side, there is no leakage of magnetic flux on the inner circumference side of the coil 1 on the primary side. As in the embodiment, the plate 2 on the secondary side is the coil 1 on the primary side.
When it is formed so as to surround the primary side coil 1, magnetic flux leakage on the outer peripheral side of the primary side coil 1 is eliminated, and a magnetic field centered on the primary side coil 1 is formed.

As a result, a stronger magnetic field can be generated as compared with the case where only the secondary side plate 2 is provided on the inner peripheral side of the primary side coil 1.

Further, since the secondary side plate 2 is formed as a so-called plate, the heat resistance is increased and the heat dissipation effect is excellent, and in particular, as in the embodiment, the secondary side plate 2 is When the coil 1 on the primary side is formed so as to surround the coil 1, the heat radiation area of the plate 2 on the secondary side is further increased, and the heat radiation effect is significantly increased.

As a result, it is sufficient to consider so-called air cooling when necessary, and it is unnecessary to have a cooling means for forcibly cooling the surface of the secondary plate 2.

[0031]

As described above, according to the present invention, since the secondary side is a plate and is arranged along the inner circumference of the coil on the primary side, the magnetic field forming function of the transformer is efficiently exhibited. In addition, the heat resistance on the secondary side is increased and the heat dissipation effect is excellent, and especially when the plate on the secondary side is formed so as to surround the coil on the primary side, a magnetic field is formed. While the function is extremely efficient,
The heat radiation area on the secondary side is further increased, and the heat radiation effect is greatly increased.

Therefore, in the formation of the transformer, the size of the transformer is not increased, and therefore there is no fear that the overall weight will be increased. Due to the cooling effect, the entire coil including the primary coil is in an oil-immersed state. In addition, when the iron core is made of a ferrite resin, the weight can be further reduced, and the overall weight can be reduced and the size can be easily realized.

As a result, it becomes possible to reduce the size and weight of the transformer while increasing the transformation ratio or the current transformation ratio.
Utilizing this type of transformer, for example, it is possible to easily realize miniaturization and weight reduction of a high-frequency heating device and the like, and to easily mount the high-frequency heating device and the like on manipulator devices. Play the advantage of.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a transformer according to the present invention.

[Explanation of symbols]

 1 primary side coil 2 secondary side plate 2b split 3 iron core 3a iron core leg 4 output terminal member 20 side wall part 21 forming extension part bottom part 22 forming extension part lid part forming extension part

Claims (3)

[Claims] 1. A transformer having a coil on the primary side and a plate on the secondary side. 2. The secondary side plate is formed in a tubular shape along the inner circumference of the primary side coil so that the iron core leg can be inserted into the inner circumference side and has a split. A transformer according to claim 1. 3. The transformer according to claim 1, wherein the coil on the primary side is surrounded by the extension of the plate on the secondary side, and the output terminal member is disposed on the extension.