KR100952498B1 - Inverter with Two-in-One Transformer - Google Patents

Abstract

An inverter using a two-in-one transformer, wherein the primary coil is electrically connected to each other by at least one load and two adjacent rods, and the secondary coil is connected in series to the primary coil. At least one two-in-one transformer for performing current balancing control of the load connected to the first main transformer, a first main transformer electrically connected to the primary coil of the two-in-one transformer, and applying a current; It may be configured to include a second main transformer electrically connected to apply a current.

Inverter, Transformer, Coil, Rod

Description

Inverter For Using 2 In 1 Transformer

The present invention relates to an inverter, and more particularly to an inverter using a two-in-one transformer.

In general, an inverter refers to a DC / AC converter used in an LCD backlight unit.

For example, the inverter is electrically connected to a plurality of Cold Cathode Fluorescent Lamps (CCFLs) in the LCD backlight unit, converts DC power to AC power, and generates a high voltage using a transformer. It may also serve to drive a cathode fluorescent lamp.

1 is a view showing an inverter circuit using a one-in-one transformer according to the prior art.

As shown in FIG. 1, a conventional inverter includes a plurality of loads 10, a plurality of 1 in 1 transformers 20, first and second main transformers ( 30, 40).

Here, the rod 10 is a place that consumes the output energy, it means a lamp or the like.

In addition, the one-in-one transformer 20 is electrically connected to one side of each of the 24 rods 10 in a one-to-one correspondence.

Subsequently, the first and second main transformers 30 and 40 convert the input of the primary side into a high voltage to drive the load 10.

Next, the 1-in-1 transformer 20 is electrically connected between the first main transformer 30 and the rod 10, and is closed by connecting the secondary side in series for the current balancing control of the primary side (lamp side). Construct a loop.

FIG. 2 is a diagram for describing an operation of an inverter according to the prior art. As shown in FIG. 2, in the 1-in-1 transformer 20, the number of turns Np of the primary coil connected to the rod is 920 turns. When the number of turns Ns of the secondary-side coil grounded is 23 turns, the output current Is of 1 transformer 20, which is 1, is 320 mA, and the current Ip applied to the load 10 is 8 mA.

At this time, it can be seen that the magnetomotive force F is F = Np × Ip = Ns × Is.

In this type of inverter, due to the reliable and well-coupled current transformer, the current drawn by each connected coil is exactly the opposite of the turn ratio.

In addition, such an inverter generates an electromotive force causing a secondary lamp current for balancing with the first current, thereby having an advantage of excellent variation in current balancing.

However, the prior art inverter using a one-in-one transformer has a problem in that the specific cost of the material cost is high in the manufacturing cost because one one-in-one transformer is used per individual rod.

In addition, since the inverter of the prior art requires a large number of 1-in-1 transformers, electromagnetic interference (EMI) occurs between them, which causes the characteristics of the inverter to be deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inverter using a two-in-one transformer that can reduce manufacturing costs by simplifying a circuit configuration using a two-in-one transformer.

Another object of the present invention to provide an inverter using a two-in-one transformer that can improve the characteristics by reducing the electromagnetic interference (EMI) using a two-in-one transformer.

Inverter using a two-in-one transformer according to the present invention, at least one load (corresponding to each other), and each of the two adjacent rods corresponding to the primary coil is electrically connected, the secondary coil is connected in series 1 At least one two-in-one transformer for performing current balancing control of a load connected to the secondary coil, a first main transformer electrically connected to the primary coil of the two-in-one transformer to apply current; And a second main transformer electrically connected to the load to apply a current.

Here, the primary coil of the two-in-one transformer includes a first coil having an input terminal connected to the primary coil of the first main transformer and an output terminal connected to one rod, and an input terminal connected to the input terminal of the first coil. It may be composed of a second coil having an output terminal connected to the other rod.

The primary coil of the two-in-one transformer includes a first coil having an input terminal connected to the primary side first coil of the first main transformer and an output terminal connected to one rod, and a primary side second of the first main transformer. It may also consist of a second coil having an input connected to the coil and an output connected to the other adjacent rod.

In addition, the first main transformer may include a primary side first coil and a primary side second coil, and only the primary side first coil may be connected to the primary side coil of the two-in-one transformer.

The first main transformer is composed of a primary side first coil and a primary side second coil, the primary side first coil is connected to the primary side first coil of the two-in-one transformer, and the primary side second coil is two-in. It may also be connected to the primary coil of the primary transformer.

Next, the second main transformer consists of a primary side first coil and a primary side second coil, and only the primary side first coil can be connected to the rod, or the primary side first coil is connected to the odd numbered rod of the rod. The primary second coil may be connected to an even numbered rod among the rods.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

An inverter using a two-in-one transformer according to the present invention has the following effects.

First, since the present invention uses one two-in-one transformer for every two rods, the number of transformers can be reduced than before, thereby simplifying circuit configuration and reducing manufacturing costs.

Second, since the present invention uses a smaller number of transformers, the present invention has an effect of improving electrical characteristics by reducing electromagnetic interference (EMI).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing an inverter circuit using a two-in-one transformer according to the first embodiment of the present invention.

As shown in FIG. 3, the first embodiment of the present invention includes a plurality of loads 100, a 2 in 1 transformer 200, a first main transformer, and a second main transformer. (300, 400).
In the present invention, the two-in-one transformer means a transformer in which two coils are installed at one side of the bobbin and one coil is installed at the other side of the bobbin.
Here, the rod 100 is a place consuming the output energy, it means a lamp or the like.

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Here, the lamp used as the rod 100 may be other lamps such as cold cathode fluorescent lamps, external electrode fluorescent lamps, but is not limited.

The one-in-one transformer 200 is electrically connected to one side of the rod 100, and the second main transformer 400 is electrically connected to the other side of the rod 100.

In addition, the first main transformer 300 is electrically connected to the two-in-one transformer 200.

The two-in-one transformer 200 connected to one side of the rod 100 corresponds to one of two rods adjacent to each other so that the primary coils are electrically connected to each other, and the secondary coils are connected in series so that the secondary coils are connected to the primary coils. Perform current balancing control.

Here, the primary coil of the two-in-one transformer 200 is composed of a first coil 200a and a second coil 200b.

In this case, the first coil has an input terminal (a) connected to the primary side first coil (300a) of the first main transformer 300 and an output terminal (b) connected to one rod (100).

The second coil 200b is connected to the input terminal a of the first coil 200a and the first terminal 300a of the first main transformer 300 together with the other terminal adjacent to the input terminal c. It has an output terminal (d) connected to the rod 100 of.

Subsequently, the first main transformer 300 has a primary side first coil 300a and a primary side second coil 300b. Only the primary side first coil 300a has a primary side agent of the two-in-one transformer 200. The first coil 200a is connected to the primary coil 200b and is not connected to the two-in-one transformer 200.

Here, the first main transformer 300 applies a reverse current to the primary side first coil 200a of the two-in-one transformer 200.

Next, the second main transformer 400 has a primary side first coil 400a and a primary side second coil 400b. Only the primary side first coil 400a is connected to the rod 100 and the primary side agent. The two coils 400b are not connected to the rod 100.

Here, the second main transformer 400 applies a constant current to the load 100.

As described above, the first embodiment of the present invention is a synchronous type, and the balance of the current applied to the load can be equally controlled by using a two-in-one transformer.

Therefore, the use of transformers can be cut in half compared to the conventional method, which simplifies the circuit configuration of the inverter.

In addition, since the present invention uses a two-in-one transformer in which two boosting coils (primary and secondary) are wound and a core that performs self-compensation, the two-in-one transformer can reduce the voltage deviation of the two output terminals. In addition, since the core performs the self-compensation role between the two bobbins, it is possible to improve the electrical properties by reducing the noise phenomenon, which is electromagnetic interference (EMI) between the two bobbins.

4 is a view showing an inverter circuit using a two-in-one transformer according to a second embodiment of the present invention.

As shown in FIG. 4, the second embodiment of the present invention relates to the electrical connection relationship between the first main transformer 300 and the two-in-one transformer 200, and the second main transformer 400 and the rod 100. In the electrical connection relationship, there is a difference from the first embodiment of the present invention.

That is, the primary side first coil 200a of the two-in-one transformer 200 is connected to the input terminal a and the rod 100 connected to the primary side first coil 300a of the first main transformer 300. It has an output stage (b) connected.

In addition, the primary side second coil 200b of the two-in-one transformer 200 has an input terminal c connected to the primary side second coil 300b of the first main transformer 300 and the other adjacent rod ( It has an output terminal (d) connected to 100).

Subsequently, the first main transformer 300 has a primary side first coil 300a and a primary side second coil 300b, wherein the primary side first coil 300a is a primary side agent of the two-in-one transformer 200. It is connected to the first coil (200a), the primary side second coil (300b) is connected to the primary side second coil (200b) of the two-in-one transformer (200).

Here, the first main transformer 300 applies a reverse current to the primary side first coil 200a of the two-in-one transformer 200 and to the primary side second coil 200b of the two-in-one transformer 200. Apply a constant current.

Next, the second main transformer 400 has a primary side first coil 400a and a primary side second coil 400b, and the primary side first coil 400a has an odd number of rods among the plurality of rods 100. The second side coil 400b is connected to an even numbered rod among the plurality of rods 100.

Here, the second main transformer 400 applies a constant current to the odd-numbered rod 100 and applies a reverse current to the even-numbered rod 100.

As described above, the second embodiment of the present invention is an asynchronous type, and similarly to the first embodiment of the present invention, a two-in-one transformer can be used to control the balance of the current applied to the load.

Therefore, the use of transformers can be cut in half compared to the conventional method, which simplifies the circuit configuration of the inverter.

In addition, since the present invention uses a two-in-one transformer in which two boosting coils (primary and secondary) are wound and a core that performs self-compensation, the two-in-one transformer can reduce the voltage deviation of the two output terminals. In addition, since the core performs the self-compensation role between the two bobbins, it is possible to improve the electrical properties by reducing the noise phenomenon, which is electromagnetic interference (EMI) between the two bobbins.

5 is a view for explaining the operation of the inverter according to the present invention, as shown in Figure 5, in the two-in-one transformer 200, the number of turns Np of the primary coil connected to the rod 100 is 920 When the number of turns Ns of the secondary coil to be turned and grounded is 23 turns, the output current Is of the two-in-one transformer 200 is 320 mA, and the current Ip applied to the load 100 is 8 mA.

At this time, it can be seen that the magnetomotive force F is F = Np × Ip = Ns × Is.

In this type of inverter, due to the reliable and well-coupled current transformer, the current drawn by each connected coil is exactly the opposite of the turn ratio.

In addition, such an inverter generates an electromotive force causing a secondary lamp current for balancing with the first current, thereby having an advantage of excellent variation in current balancing.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 is a view showing an inverter circuit using a one-in-one transformer according to the prior art.

2 is a view for explaining the operation of the inverter according to the prior art

3 is a view showing an inverter circuit using a two-in-one transformer according to a first embodiment of the present invention.

4 is a view showing an inverter circuit using a two-in-one transformer according to a second embodiment of the present invention.

5 is a view for explaining the operation of the inverter according to the present invention.

Claims (12)

At least one load; At least one two-in-one transformer corresponding to each of the two adjacent rods, the primary coils being electrically connected, and the secondary coils connected in series to perform current balancing control of the rods connected to the primary coils. 2 in 1 transformer); A first main transformer electrically connected to the primary coil of the two-in-one transformer to apply a current; And, Inverter using a two-in-one transformer, characterized in that it comprises a second main transformer electrically connected to the rod for applying a current. The method of claim 1, The rod is an inverter using a two-in-one transformer, characterized in that selected from cold cathode fluorescent lamps, external electrode fluorescent lamps. The method of claim 1, The primary coil of the two-in-one transformer may include a first coil having an input terminal connected to the primary side coil of the first main transformer and an output terminal connected to the one rod; And a second coil having an input terminal connected to an input terminal of the first coil and an output terminal connected to the other adjacent rod. The method of claim 1, The primary coil of the two-in-one transformer may include a first coil having an input terminal connected to the first side first coil of the first main transformer and an output terminal connected to the one rod; And a second coil having an input terminal connected to the second secondary coil of the first main transformer and an output terminal connected to the other adjacent rod. The method of claim 1, The first main transformer is composed of a primary side first coil and a primary side second coil, wherein only the primary side first coil is connected to the primary coil of the two-in-one transformer. Used inverter. The method of claim 5, The first main transformer is an inverter using a two-in-one transformer, characterized in that for applying a reverse current to the primary coil of the two-in-one transformer. The method of claim 1, The first main transformer consists of a primary side first coil and a primary side second coil, the primary side first coil is connected to the primary side first coil of the two-in-one transformer, and the primary side second coil Inverter using a two-in-one transformer, characterized in that connected to the primary coil of the two-in-one transformer. The method of claim 7, wherein The first main transformer applies a reverse current to the first coil of the primary side of the two-in-one transformer, and applies a constant current to the second coil of the primary side of the two-in-one transformer using a two-in-one transformer inverter. The method of claim 1, The second main transformer is composed of a primary side first coil and a primary side second coil, the inverter using a two-in-one transformer, characterized in that only the primary side first coil is connected to the rod. The method of claim 9, The second main transformer is an inverter using a two-in-one transformer, characterized in that for applying a constant current to the load. The method of claim 1, The second main transformer is composed of a primary side first coil and a primary side second coil, the primary side first coil is connected to an odd numbered rod among the rods, and the primary side second coil is an even number among the rods. Inverter using a two-in-one transformer, characterized in that connected to the second load. The method of claim 11, And the second main transformer applies a constant current to the odd-numbered rods, and applies a reverse current to the even-numbered rods.

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