KR20190071252A - Reactor Integrated Transformer - Google Patents

Abstract

The present invention relates to a reactor-integrated transformer, comprising: a primary side winding which wraps around a transformer core and a reactor core together; and a secondary side winding which wraps around only the transformer core. Here, the primary side winding includes: a part which wraps around both the transformer core and the reactor core; and a part which wraps around only the transformer core. The number of turns of the part wrapping both the transformer core and the reactor core from among the primary side winding is determined in accordance with an inductance value of the reactor. The present invention is able to, while realizing the reactor-integrated transformer, not increase a size of an opening, to control the number of turns, and to control an inductance value of the reactor thereby. The present invention is able to reduce a leakage flux by the opening, to increase efficiency, to decrease material cost, to make the transformer in a small size and a light weight, and to meet the demands in the inverter market which require a compact size.

Description

[0001] Reactor Integrated Transformer [

The present invention relates to a reactor-integrated transformer, and more particularly, to a reactor-integrated transformer capable of adjusting a desired inductance value by adjusting the number of turns without increasing the size of the gap and increasing the output density by integrating the reactor and the transformer .

Generally, a grid-connected inverter converts a DC power output from a solar cell or a fuel cell using sunlight, which is a representative alternative energy source, to an AC power using an inverter switch and a transformer, and then converts the AC power Quot; power supply "

In general, such a grid-connected inverter is required to reduce the size and weight of the apparatus and to improve the efficiency of power conversion. In view of the performance of the apparatus, it is required to minimize the distortion of the AC-converted current waveform.

However, in the conventional grid-connected inverter, the switching speed of the inverter switch for converting the DC power source to the AC power source is increased, a separate series reactor is added, or a gap is added to the transformer to increase the leakage reactance Value is increased.

FIG. 1 shows a conventional grid-connected inverter. In FIG. 1, a DC voltage source Vdc and a DC voltage source Vdc for generating and outputting a DC voltage, such as a solar cell or a fuel cell, A capacitor Cd for reducing a surge and a ripple, a switching element S1-S4 composed of a semiconductor element for converting a DC voltage output from a DC voltage link capacitor Cd into an AC square wave voltage, (Lp) for filtering the square wave voltage output from the switching unit 11 by a sinusoidal wave and for boosting or reducing the voltage of the power source filtered by the sinusoidal wave in accordance with a preset proper ratio to be connected to the grid power supply, A transformer TR and a low-pass filter AC capacitor Cp for reducing the ripple of the current output from the transformer TR and a grid-connected reactor Lo, Achieved.

As described above, it is necessary to use the reactor Lp and the isolation transformer TR to eliminate the inverter switching frequency. However, the reactor Lp and the transformer TR are separately implemented and used It is difficult to miniaturize and lighten the entire inverter system.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a transformer in which an inductance value of a reactor can be adjusted by controlling the number of turns without increasing the size of a gap, And an object of the present invention is to provide a reactor-integrated transformer.

In order to achieve the above object, a transformer integrated type transformer according to the present invention includes: a transformer core; A reactor core spaced apart from the transformer core; A primary winding wound around the transformer core and the reactor core; And a secondary winding wound around the transformer core.

At this time, the primary winding is composed of a portion that covers both the transformer core and the reactor core, and a portion that covers only the transformer core.

The number of turns of the primary winding wound around the transformer core and the reactor core may be determined according to the inductance value of the reactor.

According to the present invention, the reactor and the transformer are integrated to realize common use of the reactor winding and the primary winding of the transformer.

At this time, since the primary winding is not detected together with the reactor core and transformer core, only a part of the primary winding is wound together with the reactor core, and the remainder is wound only to the transformer core, so that the desired inductance value can be adjusted by controlling the number of turns of the reactor core .

That is, the inductance value of the reactor can be adjusted by controlling the number of turns without increasing the size of the gap.

As a result, it is possible to reduce the leakage magnetic flux by the air gap, to increase the efficiency, to reduce the material cost, to achieve the miniaturization and the weight reduction, and to meet the demand of the inverter market which becomes more and more compact.

1 shows an example of a conventional grid-connected inverter,
2 shows an example of a reactor-integrated transformer,
Fig. 3 is a view for explaining a method of winding the primary winding and the secondary winding in the reactor-integrated transformer shown in Fig. 2,
FIG. 4 is a diagram illustrating an example in which a part of the primary winding is configured to enclose only the transformer core in the present invention,
5 is an embodiment of a reactor-integrated transformer according to the present invention.

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.

In the drawings, embodiments of the present invention are not limited to the specific forms shown and are exaggerated for clarity. Although specific terms are used herein, It is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation of the scope of the appended claims.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 2 shows an example of the reactor-integrated transformer 100, and FIG. 3 shows a method of winding the primary winding 130 and the secondary winding 140 in the form of a sectional view.

The reactor-integrated transformer 100 may include a transformer core 110, a secondary winding 140, a reactor core 120, and a primary winding 130.

The transformer core 110 may be configured in an E-shape and a secondary winding 140 of the transformer is formed along the periphery of the bridge.

The reactor core 120 may also be formed in an E-shape having the same shape as that of the transformer core 110.

The reactor core 120 is spaced apart from the transformer core 110 and disposed parallel to the transformer core 110.

The primary winding 130 is configured to enclose the transformer core 110 and the reactor core 120 together. The primary winding 130 also functions as a reactor winding. Particularly, all of the primary winding 130 surrounds the transformer core 110 and the reactor core 120 together.

The reactor core 120 is for carrying out the heating of the series reactor and the magnetic flux linking the cross-sectional area of the reactor core 120 among the magnetic fluxes generated in the primary winding 130 increases the series reactance of the primary side of the transformer.

In other words, when constructing the reactor and the transformer separately, it is necessary to construct components such as (reactor core) + (reactor winding) + (transformer core) + (transformer primary winding) + (transformer secondary winding).

However, when the reactor-integrated transformer 100 is constructed as in the example shown in Fig. 2, since the reactor winding and the primary winding of the transformer are commonly used, (reactor core) + (transformer core) + (transformer primary winding) + (Secondary winding of the transformer), the same performance can be achieved.

On the other hand, if the winding is wound in the form of the example shown in FIG. 2 and FIG. 3, the number of turns of the primary winding 130 directly affects the reactor inductance value.

Since the inductance value can be obtained by the following equation (1).

Where N is the number of turns of the primary winding, R is the magnetoresistance of the reactor, μ is the permeability, A is the cross-sectional area of the reactor, and 1 is the length of the reactor.

To adjust the inductance value of the reactor, the magnetoresistance value of the reactor should be changed while the number of turns is fixed. This cavity size can be adjusted by providing a cavity in the reactor core 120 in a suitable manner. In this case, if the number of turns of the primary winding 130 is large, the length of the gap should be increased.

However, increasing the gap increases the leakage rate, which leads to an increase in loss and deterioration of the overall efficiency.

In order to solve such a problem, the reactor-integrated transformer according to the present invention basically includes the primary winding 130 to surround the transformer core 110 and the reactor core 120, but a part of the primary winding 130 So as to enclose only the transformer core 110.

Referring to FIG. 4, a reactor-integrated transformer according to the present invention includes a transformer core 110 and a reactor core 120, 130 are configured to enclose only the transformer core 110. [0053]

Thus, a portion 130-1 of the primary winding 130 surrounds the transformer core 110 and the reactor core 120 together, and the remaining portion 130-2 of the primary winding 130 is connected to the transformer core 110 may be configured in various ways.

FIG. 5 shows an embodiment of a reactor-integrated transformer 200 according to the present invention, which includes a transformer core 110, a reactor core 120 spaced apart from the transformer core 110, a transformer core 110, Side winding 130 surrounding the transformer core 120 and a secondary winding 140 surrounding the transformer core 110 only.

The primary winding 130 includes a transformer core 110 and a reactor core 120 and a transformer core 110. The primary winding 130 includes a transformer core 110 and a transformer core 110,

The reactor core 120 and the transformer core 110 are wound around the transformer core 120 and the transformer core 110. Since the primary winding 130 does not sense the reactor core 120 and uses only a part of the transformer core 110, The desired inductance value can be made by the number of turns of the inductor.

That is, the number of turns of the portion 130-1 surrounding the transformer core 110 and the reactor core 120 among the primary windings 130 can be determined according to the inductance value of the reactor.

The turns of the windings surrounding the reactor core 120 when the primary winding 130 is wound are longer than those when the transformer core 110 alone is wound, resulting in an increase in the winding resistance.

Therefore, by using the method of winding only the necessary number of turns on the reactor core 120 and winding the remainder on the transformer core 110, it is possible to eliminate the primary winding portion unnecessarily wound around the reactor core 120, Thereby preventing the increase in the amount of the water.

As a result, both the transformer and the reactor function as well as reducing the loss and voltage drop in the windings, thereby enhancing the performance.

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.

100, 200: reactor-integrated transformer
110: transformer core 120: reactor core
130: Primary winding 140: Secondary winding

Claims (2)

Transformer core;
A reactor core spaced apart from the transformer core;
A primary winding wound around the transformer core and the reactor core; And
And a secondary winding wound around the transformer core only,
Wherein the primary winding comprises a portion surrounding both the transformer core and the reactor core, and a portion surrounding only the transformer core. The method according to claim 1,
Wherein the number of turns of a portion of the primary winding that surrounds both the transformer core and the reactor core is determined according to an inductance value of the reactor.

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