KR102658850B1 - Multiple winding High Voltage Isolated Transformer - Google Patents

Abstract

The present invention relates to a multi-winding high voltage isolation transformer.
The present invention was created to achieve the object of the present invention as described above, and the present invention includes a primary winding unit 100; n (n is a natural number equal to or greater than 2) secondary winding units 200 arranged to be point symmetrical about the primary winding unit 100; Disclosed is a multi-winding high-voltage isolation transformer comprising n core parts 300 shared by the primary winding part 100 and each secondary winding part 200.

Description

{Multiple winding High Voltage Isolated Transformer}

The present invention relates to a multi-winding high voltage isolation transformer.

A typical multi-winding high-voltage insulated high-frequency transformer, as shown in FIGS. 1A and 1B, combines one core 10 or several cores 11, 12, 13, and 14, with all windings on one core 10. Use the winding method.

And the multi-winding high-voltage insulated high-frequency transformer uses a high-voltage bobbin 30 to secure insulation, and additional insulation is secured using a silicone mold or high-voltage insulating tube.

And since the existing multi-winding transformer is designed with unbalanced leakage inductance, in a converter using leakage inductance, an additional inductor is installed externally to balance the inductance.

In other words, in the existing multi-winding transformer, the leakage inductance value between each port of the transformer is not the same, so the inductance value of the additional external inductor must be designed to be different, and the size of the system increases due to the external inductor. There is.

In addition, the existing multi-winding transformer has a problem in that the imbalance in leakage inductance increases as the number of ports increases.

In addition, in the existing multi-winding transformer, it is not easy to individually design the leakage inductance because the arrangement of the windings and the distance between windings, which are directly related to the leakage inductance, are related to the electric field strength. Furthermore, existing multi-winding transformers often do not achieve equal electric fields, so there is a problem that the distance to secure dielectric strength or the thickness of the insulator is increased.

Meanwhile, the size of the leakage inductance is affected by the shape of the core, winding method, arrangement, distance, etc., as shown in FIGS. 1C and 1D. In particular, the leakage inductance value varies depending on the arrangement of the windings as well as the distance between windings.

As can be seen in the equation of FIG. 1c, distance and arrangement are important, and existing multi-winding transformers do not obtain a balanced leakage inductance because the distance and arrangement from the output winding are not uniform. In particular, since high-voltage isolation transformers must use insulators to satisfy insulation, they suffer from the problem that the size of leakage inductance for each port varies depending on the arrangement and shape of the insulator. Therefore, it is more difficult to obtain a balanced leakage inductance.

Therefore, in order to overcome this problem, the prior art design is designed to minimize the leakage inductance of the transformer itself, and then adjusts the overall inductance value by adding an external inductor to compensate for the insufficient leakage inductance.

However, due to the unbalanced inductance component generated by the transformer itself, the inductance value of the inductor that must be manufactured for each port is different, causing problems in both productivity and economic efficiency.

Another design method is to design the transformer itself with an inductance equal to the inductance required for the converter topology. However, since the size of the leakage inductance varies due to geometric factors, it is difficult to analyze the electric field and secure insulation during the balancing process, which leads to problems such as wasting unnecessary insulation distance.

(Non-patent Document 1) Transformer and Inductor Design Handbook (Colonel Wm. T. Mclyman, 2004)

The purpose of the present invention is to provide a multi-winding high-voltage isolation transformer that can achieve balance between leakage inductances of ports when constructing a multi-winding high-voltage isolation transformer.

The present invention was created to achieve the object of the present invention as described above, and the present invention includes a primary winding unit 100; n (n is a natural number equal to or greater than 2) secondary winding units 200 arranged to be point symmetrical about the primary winding unit 100; Disclosed is a multi-winding high-voltage isolation transformer comprising n core parts 300 shared by the primary winding part 100 and each secondary winding part 200.

The primary winding unit 100 includes a bobbin 110 with up and down through holes 111 formed, and a winding unit 120 wound on the bobbin 110, and the secondary winding unit 200 includes a bobbin 210 in which through holes 211 are formed up and down, and a winding part 220 wound on the bobbin 210, and each core part 300 includes the primary winding part 100. ) and may be installed through the through hole 111 of each secondary winding unit 200.

The bobbin 110 of the primary winding unit 100 may have a cylindrical shape, and the bobbin 210 of the secondary winding unit 200 may have a cylindrical or polygonal pillar shape.

The n is a natural number of 3 or more, the bobbin 110 of the primary winding unit 100 has a regular n-prismatic shape, and the bobbin 210 of the secondary winding unit 200 has a cylindrical shape or polygonal shape. It may have a prismatic shape.

Each of the core parts 300 may have a circular ring or square ring shape.

The through hole 111 of the bobbin 110 of the primary winding unit 100 is connected to the bobbin of the primary winding unit 100 in the empty space 410 formed by the outer peripheral surfaces of the core units 300. In order to fix the core parts 300 within the through hole 111 of 110, a fixing member having a shape corresponding to the shape of the empty space 410 may be additionally installed.

The winding unit 120 of the primary winding unit 100 may include a pair of coil windings arranged in the vertical direction of the bobbin 110 and having separate ports.

The winding unit 220 of each secondary winding unit 200 may include a pair of coil windings arranged in the vertical direction of the bobbin 210 and having separate ports.

The multi-winding high-voltage isolation transformer according to the present invention symmetrically arranges n, for example, three secondary windings with respect to one primary winding to prevent leakage of the ports of the secondary windings when constructing the multi-winding high-voltage isolation transformer. There is an advantage in being able to achieve balance between inductances.

The multi-winding high-voltage isolation transformer according to the present invention uses a UU core to wind an individual input winding (secondary winding) around one leg of each core, and the remaining legs are gathered to wind the output winding (primary winding).

The effect of the multi-winding high-voltage isolation transformer according to the present invention will be explained separately in terms of magnetic and electric fields. First, in terms of magnetic field, unlike a general transformer type, all cores do not share the magnetic flux induced at each port, It is a structure in which magnetic flux induced from individual ports is combined at the output stage.

In particular, because the geometrically symmetrical structure has the same distance between the output winding and the input winding, a balanced leakage inductance can be secured. In addition, by changing the width of the core window, the leakage inductance can be adjusted to the user's desired value.

Meanwhile, the multi-winding high-voltage isolation transformer according to the present invention can be used in most multi-input-single-output or single-input-multi-output converters that require high-voltage insulation and use leakage inductance.

In addition, the multi-winding high-voltage isolation transformer according to the present invention can place leakage inductance inside the transformer, thereby reducing the size of the system and ensuring economic efficiency.

In addition, the multi-winding high-voltage isolation transformer according to the present invention can secure a balanced leakage inductance and can be manufactured by setting an arbitrary inductance, so reliability and stability can be secured in the control and operation of the converter.

1A and 1B are perspective views showing the structure of a conventional transformer.
1C and 1D are conceptual diagrams showing an example of the structure of a conventional transformer and a formula for calculating leakage inductance according to the example.
Figure 2 is a perspective view showing a transformer according to the present invention.
FIG. 3 is a cross-sectional view seen from the III-III direction in FIG. 2.
FIG. 4 is a top view of the transformer of FIG. 2.
FIG. 5 is a circuit diagram showing the circuit configuration of the transformer of FIG. 2.
Figure 6 is a perspective view showing an example of the bobbin of the primary winding part of the transformer of Figure 2.
Figure 7 is a perspective view showing an example of the bobbin of the secondary winding part of the transformer of Figure 2.
FIG. 8 is a cross-sectional view showing an example of the core of the transformer of FIG. 2.

Hereinafter, the multi-winding high-voltage isolation transformer according to the present invention will be described with reference to the attached drawings.

As shown in FIGS. 2 to 6, the multi-winding high-voltage isolation transformer according to the present invention includes a primary winding portion 100; n (n is a natural number equal to or greater than 2) secondary winding units 200 arranged to be point symmetrical about the primary winding unit 100; It includes n core units 300 shared by the primary winding unit 100 and each secondary winding unit 200.

The primary winding section 100 is a winding section that forms the primary winding section of a transformer, and can have various configurations.

For example, the primary winding unit 100 may include a bobbin 110 in which through-holes 111 are formed at the top and bottom, and a winding unit 120 wound on the bobbin 110.

The bobbin 110 is made of an insulating material, has through holes 111 formed at the top and bottom so that the core part 300, which will be described later, can be inserted, and has a winding part 120 wound thereon, so various configurations are possible.

For example, the bobbin 110 is a configuration in which the coil of the winding unit 120 is wound, and flanges 112 are formed at both ends to ensure stable winding and insulation of the coil, and n secondary winding units to be described later. For symmetrical arrangement of (200), it may have a cylindrical shape, a regular polygonal prism, or especially a regular n polygonal prism shape.

The winding unit 120 is a coil wound around the bobbin 110 and can have various configurations, such as having a pair of terminals for connection to the outside.

The secondary winding unit 200 is a winding unit that is wound around the bobbin 210 to form the secondary winding unit of the transformer, and various configurations are possible.

In particular, it is preferable that n (n is a natural number of 2 or more) secondary winding units 200 are arranged in point symmetry with respect to the primary winding unit 100 as the center.

In particular, the n (n is a natural number of 2 or more) secondary winding units 200 are horizontally symmetrical with respect to the center of the bobbin 110 of the primary winding unit 100 when viewed from the top - horizontal plane, 1 on the X-Y plane. It is preferable that the secondary winding unit 100 is arranged to be point symmetrical with respect to the center of the bobbin 110.

Meanwhile, the secondary winding unit 200 may include a bobbin 210 in which through holes 211 are formed at the top and bottom, and a winding unit 220 wound on the bobbin 210.

The bobbin 210 is made of an insulating material, has through holes 211 formed at the top and bottom so that the core part 300, which will be described later, can be inserted, and has a winding part 220 wound thereon, so various configurations are possible.

For example, the bobbin 210 is a configuration in which the coil of the winding unit 220 is wound, and flanges 212 are formed at both ends for stable winding of the coil, and the n secondary winding units 200 are symmetrical. For arrangement purposes, it may have a cylindrical shape, a polygonal pillar shape, especially an n-polygonal pillar shape, and preferably a rectangular shape.

In particular, when the horizontal shape of the bobbin 210 of the secondary winding unit 200 has a rectangular shape, the long side may be arranged perpendicular to the radial direction with respect to the center of the bobbin 110 of the primary winding unit 100. there is.

The winding unit 220 is a coil wound around the bobbin 210 and can have various configurations, such as having a pair of terminals for connection to the outside.

The core part 300 is installed in n pieces corresponding to the number of secondary winding parts 200 and shared with the primary winding part 100 and each secondary winding part 200 to form a transformer, and can be used in various ways. Configuration is possible.

The core portion 300 may be formed by stacking iron cores of conductive materials, and may have a circular ring or square ring shape when viewed from the side.

In particular, the shape of the core portion 300 may have a shape corresponding to the shape of the bobbin 110 of the primary winding portion 100 and the shape of the bobbin 210 of the secondary winding portion 200.

For example, the bobbin 110 of the primary winding unit 100 has a cylindrical shape, as shown in FIG. 6, and the bobbin (110) of the secondary winding unit 200, as shown in FIG. 7 When 210 has a rectangular pillar shape, the core portion 300 may have a rectangular ring shape.

And, as shown in FIG. 8, the core portion 300 includes the bobbin 110 of the primary winding portion 100 and the bobbin 210 of the secondary winding portion 200, which form an integrated structure made of an insulating material. Considering the combination, it is preferable that the rectangular ring shape is made of a UU-shaped core divided into upper and lower parts.

Meanwhile, each of the core parts 300 is installed through the through hole 111 of the primary winding part 100 and the through hole 211 of each secondary winding part 200.

At this time, at least some of the through holes 111 of the primary winding section 100 and the through holes 211 of each secondary winding section 200 are air insulated. It may form an empty space, or the member of the insulating material may be filled considering a preset inductor.

For example, the through hole 111 of the bobbin 110 of the primary winding unit 100 is located in the empty space 410 formed by the outer peripheral surfaces of the core units 300 of the primary winding unit 100. In order to fix the core parts 300 within the through hole 111 of the bobbin 110, a fixing member having a shape corresponding to the shape of the empty space 410 may be additionally installed.

Meanwhile, the technical gist of the transformer according to the present invention is not that the magnetic flux is shared and wound around one core, but that the magnetic flux of the core 300 generated at individual ports is combined at the output terminal.

That is, the symmetrical arrangement of the secondary winding unit 200 in the transformer according to the present invention allows the leakage inductance value for each port to be uniformly manufactured and can be arbitrarily individually adjusted.

Additionally, since the transformer according to the present invention uses the leakage inductance of the transformer itself, the system size can be reduced.

In particular, the transformer according to the present invention is composed of a symmetrical structure to form a relatively uniform electric field, and since the output winding is wound on a cylindrical bobbin, the electric field is prevented from being extremely biased to one side, thereby reducing the maximum electric field intensity and causing insulation breakdown. It can lower the possibility.

Accordingly, the transformer according to the present invention, as shown in FIGS. 2 to 4 and 8, uses the UU core 300 to have individual input windings (secondary windings) on one leg of each core 310 and 320. It is in the form of winding the winding part 220 of (200) and gathering the remaining legs to wind the output end winding (winding part 120 of the primary winding part 100).

If the transformer according to the present invention with the above configuration is described separately in terms of magnetic fields and electric fields, in terms of magnetic fields, it is not a method in which all cores share the magnetic flux induced in each port like a general transformer type, but individual ports. It is a structure in which the magnetic flux induced from is combined at the output stage.

And the transformer according to the present invention has a geometrically symmetrical configuration with an output winding (winding section 120 of the primary winding section 100) and an input winding (winding section 220 of the secondary winding section 200). Since the distances between them are all the same, a balanced leakage inductance can be secured.

Furthermore, by changing the window width of the core 300, the leakage inductance can be adjusted to a value desired by the user.

The transformer according to the present invention can use two types of bobbins, cylindrical and square, as shown in FIGS. 6 and 7 in order to easily wind the windings 120 and 220 in terms of electric field while also securing insulation. .

Meanwhile, as an embodiment of the transformer according to the present invention, various embodiments are possible depending on the shape of the bobbin 110 of the primary winding unit 100 and the shape of the bobbin 210 of the secondary winding unit 200.

For example, the bobbin 110 of the primary winding unit 100 may have a cylindrical shape, and the bobbin 210 of the secondary winding unit 200 may have a cylindrical or regular polygonal pillar shape.

In addition, when n is a natural number of 3 or more, the bobbin 110 of the primary winding unit 100 has a regular n-prismatic shape, and the bobbin 210 of the secondary winding unit 200 has a cylindrical shape or a polygonal pillar shape. You can have

Meanwhile, the transformer according to the present invention is characterized by a symmetrical arrangement so that the distance from each coil winding is constant, and the winding section 120 of the primary winding section 100 and the secondary winding section 200 At least one of the winding units 220 may be composed of a pair of coil windings having separate ports symmetrically arranged along the longitudinal direction of the bobbins 110 and 210.

That is, the winding unit 120 of the primary winding unit 100 is composed of a pair of coil windings, that is, two ports, with separate ports symmetrically arranged along the longitudinal direction of the bobbin 110. You can.

In addition, the winding unit 220 of the secondary winding unit 200 is a pair of coil windings having separate ports symmetrically arranged along the longitudinal direction of the bobbin 210, that is, two coil windings in each winding unit 220. It can be composed of ports.

The above is only a description of some of the preferred embodiments that can be implemented by the present invention, and therefore, as is well known, the scope of the present invention should not be construed as limited to the above embodiments, and the scope of the present invention as described above should not be construed. Both the technical idea and the technical idea underlying it will be said to be included in the scope of the present invention.

100: Primary winding part 200: Secondary winding part
300: Core part

Claims (8)

delete A primary winding unit 100;
n (n is a natural number equal to or greater than 2) secondary winding units 200 arranged to be point symmetrical about the primary winding unit 100;
It includes n core parts 300 shared by the primary winding part 100 and each secondary winding part 200,
The primary winding unit 100 includes a bobbin 110 with up and down through holes 111 formed, and a winding unit 120 wound on the bobbin 110,
The secondary winding unit 200 includes a bobbin 210 in which through holes 211 are formed at the top and bottom, and a winding unit 220 wound on the bobbin 210,
Each of the core parts 300 is installed through the through hole 111 of the primary winding part 100 and the through hole 211 of each secondary winding part 200,
The through hole 111 of the bobbin 110 of the primary winding unit 100 is,
For fixing the core parts 300 within the through hole 111 of the bobbin 110 of the primary winding part 100 in the empty space 410 formed by the outer peripheral surfaces of the core parts 300. A multi-winding high voltage isolation transformer, characterized in that a fixing member having a shape corresponding to the shape of the empty space 410 is additionally installed. In claim 2,
The bobbin 110 of the primary winding unit 100 has a cylindrical shape, and the bobbin 210 of the secondary winding unit 200 has a cylindrical or polygonal pillar shape. Transformers. In claim 2,
The n is a natural number of 3 or more,
The bobbin 110 of the primary winding unit 100 has a regular n-gonal column shape, and the bobbin 210 of the secondary winding unit 200 has a cylindrical shape or a polygonal column shape. Winding high voltage isolation transformer. In claim 2,
Each core portion 300 is a multi-winding high voltage isolation transformer, characterized in that it has a circular ring or square ring shape. delete The method of any one of claims 2 to 5,
The winding section 120 of the primary winding section 100,
A multi-winding high voltage isolation transformer comprising a pair of coil windings disposed in the vertical direction of the bobbin 110 and having separate ports. The method of any one of claims 2 to 5,
The winding section 220 of each secondary winding section 200,
A multi-winding high voltage isolation transformer comprising a pair of coil windings disposed in the vertical direction of the bobbin 210 and having separate ports.

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