KR101701940B1

KR101701940B1 - Three phase transformer which can function as inductor

Info

Publication number: KR101701940B1
Application number: KR1020150074953A
Authority: KR
Inventors: 정대택
Original assignee: 주식회사 피앤이솔루션
Priority date: 2015-05-28
Filing date: 2015-05-28
Publication date: 2017-02-02
Also published as: KR20160139662A

Abstract

A three-phase transformer having the function of an inductor is disclosed. A three-phase transformer having an inductor function includes a primary core portion having an EI core shape; A secondary core portion disposed parallel to the primary core portion so as to face each other and having an EI core shape; A first coil part arranged to surround the first outer leg of the primary core part; A second coil portion arranged to surround the center leg of the primary core portion; A third coil portion arranged to surround the second outer leg of the primary core portion; A fourth coil portion arranged to surround the first coil portion and the first outer leg of the secondary core portion; A fifth coil part arranged to surround the second coil part and the center leg of the secondary core part; And a sixth coil portion arranged to surround the third coil portion and the second outer leg of the secondary core portion.

Description

[0001] THREE PHASE TRANSFORMER WHICH CAN FUNCTION AS INDUCTOR [0002]

The present invention relates to a three-phase transformer, and more particularly to a three-phase transformer having the function of an inductor.

The transformer is a device for converting the magnitude of an AC voltage using electromagnetic induction phenomenon. It is composed mainly of a coil and a core of a magnetic body, and the coil is wound around the core of the magnetic body. After winding the coils on both sides of the core, the magnitude of the magnetic field changes as the current supplied from one power supply changes with time. At this time, the magnetic field is transmitted through the core, and the intensity of the magnetic field passing through the opposite coil also changes with time. In the opposite coil, induction electromotive force is generated due to electromagnetic induction phenomenon, and an induction current flows to induce an alternating current. In this case, the magnitude of the voltage can be changed according to the winding ratio of the coil. Also, since the transformer is not connected to the primary side (input side) coil of the voltage and the secondary side (output side) coil, the transformer also performs the insulation function because it transfers the electric power by the electromagnetic induction.

In the case of a power conversion apparatus including an existing transformer, since an inductor is required in the power conversion apparatus due to the structure of the circuit, the transformer and the inductor for voltage conversion are installed, respectively, There is a problem that the weight is heavy.

Therefore, the inventor of the present invention has developed a transformer capable of exhibiting the function of an inductor without separately installing an inductor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-phase transformer capable of performing voltage conversion and simultaneously performing an inductor function.

According to an aspect of the present invention, there is provided a three-phase transformer having an inductor function, including: a primary core unit having an EI core shape; A secondary core portion disposed parallel to the primary core portion so as to face each other and having an EI core shape; A first coil part arranged to surround the first outer leg of the primary core part; A second coil portion arranged to surround the center leg of the primary core portion; A third coil portion arranged to surround the second outer leg of the primary core portion; A fourth coil portion arranged to surround the first coil portion and the first outer leg of the secondary core portion; A fifth coil part arranged to surround the second coil part and the center leg of the secondary core part; And a sixth coil portion arranged to surround the third coil portion and the second outer leg of the secondary core portion.

The shape of the core used in the transformer is not a donut type or a donut type but an annular one with a circular cross section and a `EI` core having a shape in which a letter E and an letter I are one group. The primary core portion and the secondary core portion have the shape of an EI core.

The primary core portion may have three legs having the same shape, and the leg located on the left side is referred to as a first outer leg, the leg located in the middle is referred to as a center leg, and the leg located on the right side is referred to as a second outer leg. This designation applies equally to the secondary core portion.

In one embodiment, the first coil portion to the third coil portion each have a different one phase selected from an R phase, an S phase, and a T phase, and the first coil portion, the first coil portion, The coil portion, the fifth coil portion, and the third coil portion and the sixth coil portion may have the same phase, respectively.

The present invention has the effect of simultaneously performing voltage conversion and also functioning as an inductor.

The present invention can eliminate the inductors included in the conventional power conversion apparatus, thereby reducing the volume and weight of the power conversion apparatus.

Since the inductor of the power conversion device can be removed, space and cost for installing the power conversion device can be saved.

1 is a perspective view of a three-phase transformer having an inductor function according to an embodiment of the present invention.
FIG. 2 is a perspective view of the primary core portion and the secondary core portion of FIG. 1 in a transparent manner. FIG.
3 is a bottom view of a three-phase transformer having the function of an inductor according to an embodiment of the present invention.
Fig. 4 is a bottom view of the primary core portion and the secondary core portion of Fig. 3 in a transparent manner.

The present invention is a result of research carried out with support from the Ministry of Land, Infrastructure and Transport Science and Technology Promotion Agency of Japan, "Railroad Technology Research Project".

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Wherein like reference numerals refer to like elements throughout.

FIG. 1 is a perspective view of a three-phase transformer having a function of an inductor according to an embodiment of the present invention. FIG. 2 is a perspective view of a primary core portion and a secondary core portion of FIG. 3 is a bottom view of a three-phase transformer having the function of an inductor according to an embodiment of the present invention, and FIG. 4 is a bottom view of a primary core portion and a secondary core portion of FIG.

1 to 4, a three-phase transformer 1000 having an inductor function according to an embodiment of the present invention includes a primary core unit 100, a first coil unit 110, a second coil unit 120 The third coil part 130, the second core part 200, the fourth coil part 210, the fifth coil part 220 and the sixth coil part 230. [

The primary core portion 100 and the secondary core portion 200 may each have an EI core shape and may have the same shape and size. In addition, the primary core portion 100 and the secondary core portion 200 may be arranged in parallel. For example, parallel to the primary core portion 100 so as to face each other.

The first coil part 110 may be arranged to surround the first outer leg of the primary core part 100. For example, the first coil part 110 may be formed of a conductive coil. The first coil part 110 may be formed by winding the conductive coil on the first outer leg of the primary core part 100 a plurality of times. For example, the first coil part 110 may have a square pillar shape with a hollow, and each corner of the square pillar may have a rounded shape.

The second coil part 120 may be arranged to surround the center leg of the primary core part 100. For example, the second coil portion 120 may be formed of a conductive coil. The second coil part 120 can be formed by winding the conductive coil on the center leg of the primary core part 100 multiple times. For example, the second coil part 120 may have a square pillar shape with a hollow, and each corner of the square pillar may have a rounded shape.

The third coil part 130 may be arranged to surround the second outer leg of the primary core part 100. For example, the third coil part 130 may be formed of a conductive coil. The third coil part 130 can be formed by winding the conductive coil on the second outer leg of the primary core part 100 a plurality of times. For example, the third coil part 130 may have a square pillar shape with a hollow, and each corner of the square pillar may have a rounded shape.

The number of times that the conductive coil is wound on the first coil part 110, the second coil part 120, and the third coil part 130 may be equal to each other. Further, the first coil part 110 to the third coil part 130 may have different phases, respectively, selected from R phase, S phase and T phase.

The fourth coil part 210 may be arranged to surround the first coil part 110 and the first outer leg of the secondary core part 200. For example, the fourth coil part 210 may be made of a conductive coil, and may have the same phase as the first coil part 110. The fourth coil part 110 can be formed by winding the conductive coil on the first coil part 110 and the first outer leg of the secondary core part 200 a plurality of times.

The fifth coil part 220 may be arranged to surround the second core part 120 and the center leg of the secondary core part 200. For example, the fifth coil portion 220 may be made of a conductive coil and may have the same phase as the second coil portion 120. The fifth coil part 220 may be formed by winding the conductive coil on the center legs of the second coil part 120 and the secondary core part 200 a plurality of times.

The sixth coil portion 230 may be disposed to surround the third coil portion 130 and the second outer leg of the secondary core portion 200. For example, the sixth coil portion 230 may be made of a conductive coil and may have the same phase as the third coil portion 130. The sixth coil part 230 may be formed by winding the conductive coil on the third coil part 130 and the second outer leg of the secondary core part 200 a plurality of times.

The number of times that the conductive coil is wound on the fourth coil part 210, the fifth coil part 220 and the sixth coil part 230 may be equal to each other.

The magnetic fluxes formed in the first coil part 110

) And the number of times the conductive coil is wound on the first coil part 110 (

) To calculate the primary voltage (

), The following equation (1) is obtained.

The magnetic flux generated in the fourth coil part 210 inductively coupling with the first coil part 110

And the number of times the conductive coil is wound on the fourth coil part 210

) To calculate the secondary voltage (

) Can be obtained by the following equations (2) and (3).

Using the above equations (1) and (3), the equations can be summarized as Equation (4) below.

The first term of the right side of Equation (4) is the same as the voltage formula of the transformer, and the second term of the right side of Equation (4) is the same as the voltage formula of the inductor. Accordingly, it can be seen that the three-phase transformer 1000 having the inductor function can perform the function of the inductor according to the embodiment of the present invention.

In a conventional power converter structure using one core and two coils used in a transformer, one core used in the inductor and one coil, that is, two cores and three coils, the function of the inductor according to the embodiment of the present invention The inductor can be removed. Therefore, it is possible to reduce the volume and space of the power inverter while exhibiting the same function as the conventional one.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

1000: a three-phase transformer having the function of an inductor 100:
110: first coil part 120: second coil part
130: third coil part 200: secondary core part
210: fourth coil part 220: fifth coil part
230: sixth coil portion

Claims

A primary core portion having an EI core shape;
A secondary core portion disposed parallel to the primary core portion so as to face each other and having an EI core shape;
A first coil part arranged to surround the first outer leg of the primary core part;
A second coil portion arranged to surround the center leg of the primary core portion;
A third coil portion arranged to surround the second outer leg of the primary core portion;
A fourth coil portion arranged to surround the first coil portion and the first outer leg of the secondary core portion;
A fifth coil part arranged to surround the second coil part and the center leg of the secondary core part; And
And a sixth coil portion arranged to surround the third coil portion and the second outer leg of the secondary core portion.

The method according to claim 1,
Wherein the first coil portion to the third coil portion each have one phase selected from the R phase, the S phase, and the T phase,
Wherein the first coil part and the fourth coil part, the second coil part and the fifth coil part, and the third coil part and the sixth coil part have the same phase with each other, .