KR100581872B1 - Transformer for plasma display apparatus having noise decreasing structure - Google Patents

Abstract

An object of the present invention is to provide a transformer for a plasma display device having a structure which prevents the shaking of the transformer and the collision with surrounding components. To achieve this object, the present invention provides three E-shaped transformers. A first core formed in parallel with each other and having a predetermined gap therebetween, and a core part having a second core, a first center convex part located in the center of the first core, and a first of the second cores A bobbin fitted to the core portion to enclose the second central convex portion corresponding to the central convex portion, a coil portion having a primary coil and a secondary coil wound on an outer surface of the bobbin, an insulating material for embedding the bobbin wound with the coil portion, and Provided is a transformer for a plasma display device comprising a noise preventing material filling a gap between an insulating material and a core part and a gap between a first core and a second core.

Description

 Transformer for plasma display apparatus having noise reduction structure

1 is a block diagram showing a schematic configuration of a power supply device of a conventional plasma display device;

Figure 2 is an exploded perspective view showing the components of a conventional transformer for plasma display device,

3 is a front view showing the front of the transformer of FIG.

4 is an exploded perspective view illustrating components of a transformer for a plasma display device according to an exemplary embodiment of the present invention.

FIG. 5 is a front view illustrating the front of the transformer of FIG. 4.

Explanation of symbols on the main parts of the drawings

100: transformer for plasma display device 150: core part

151: first core 151b: first central convex portion

152: second core 152b: second middle convex portion

161: bobbin 171: coil

181: Insulation material 190: Noise control material

C: gap G1, G2, G3: gap

The present invention relates to a transformer, and more particularly, to a transformer for a plasma display device having a structure in which noise is prevented.

Plasma display panels, which are recently attracting attention as replacing conventional cathode ray tube display devices, have a discharge voltage applied after discharge gas is filled between two substrates on which a plurality of electrodes are formed. Therefore, the phosphor formed in a predetermined pattern is excited by ultraviolet rays generated from the discharge gas, thereby obtaining a desired image.

In order to display an image on the plasma display panel, a conventional plasma display apparatus provides an image unit for providing an image signal in addition to the plasma display panel, and a control signal for controlling a necessary power supply voltage to be provided to the driver in accordance with the image signal. And a driving unit for directly driving a panel by applying a power supply voltage by a control signal of the logic unit, and a power supply unit providing a power supply voltage to the driving unit. As such, the plasma display panel is combined with a power driving unit for driving the same, and a chassis base to form a plasma display apparatus.

In particular, various types of high voltages required for plasma discharge of the plasma display panel are supplied to the driving circuit by the power supply device, and other circuit parts of the plasma display device, that is, image processing part, control circuit part, fan, and audio part (audio) are provided. Low voltage is supplied.

1 is a block diagram showing a schematic configuration of a power supply apparatus of a conventional plasma display panel. As shown, the power supply device 20 of a conventional plasma display panel includes an oscillation circuit 21, a PWM control circuit 22, a switch circuit 23, a filter 24, and a reference voltage circuit 25. Doing.

The power supply device 20 of the plasma display panel having such a configuration operates as follows. First, oscillation occurs at a constant frequency in the oscillation circuit 21 and is input to the PWM (Pulse Width Modulation) control circuit 22. At the same time, the reference voltage signal of the reference voltage circuit 25 and the output voltage of the final stage filter 24 It is input to the PWM control circuit 22. The PWM control circuit 22 compares the reference voltage signal of the reference voltage circuit 25 with the output voltage of the filter 24. In order to correct the difference between the reference voltage signal and the output voltage, the PWM control circuit 22 performs pulse width modulation with ON-OFF only using the oscillation signal and transmits the pulse width modulation to the switch circuit 23. At this time, when the output voltage is lower than the reference voltage, the output voltage is increased by lengthening the ON period, and when the output voltage is higher than the reference voltage, the output voltage is increased by decreasing the output voltage. The switch circuit 23 only serves to turn ON / OFF only the current according to the input signal.

The output voltage passing through the switch circuit 23 contains very much noise. The filter 24 is used to output only direct current. Accordingly, a voltage is transmitted from the power supply device 20 to the driver 30 by a control signal of a logic unit (not shown), and an image is displayed on the plasma display panel 40 by the driver 30.

The power supply device 20 of the plasma display panel performing such an operation is a switching mode power supply (SMPS), and the output voltage of the filter 24 is provided by the reference voltage circuit 25. If it is lower or higher, compare the reference voltage with the actual output voltage and feedback this comparison so that the actual output voltage becomes the reference voltage. The switching mode power supply having the structure and function as described above requires a plurality of transformers.

As shown in FIGS. 2 and 3, a typical transformer 10 used in a plasma display device includes a core portion 50, a bobbin 61, and a coil portion 71. The core part 50 is provided with the 1st core 51 normally in E-shape, and the 2nd core 52 formed so that the said 1st core 51 may be opposed. In the first core 51, the first left convex portion 51a, the first middle convex portion 51b, and the first right convex portion 51c are formed from the left side as shown in the drawing. In the second core 52 disposed to face the first core 51, a second left convex portion 52a, a second middle convex portion 52b, and a second right convex portion 52c are formed in parallel. do.

A gap is formed between the first core 51 and the second core 52. The gap is formed with a gap of G1, G2, G3 from the left side, as shown in the figure, the size of the gap is determined by the capacity of the transformer 10. A bobbin 61 is inserted into a central convex portion of the first core 51 and the second core 52, and a coil part composed of a primary coil and a secondary coil on an outer circumferential surface of the bobbin 61. (71) is wound.

However, the plasma display device requires a high capacity voltage and has a large load fluctuation range. Therefore, when a high capacity voltage is required, a large amount of current moves through the gaps G1, G2, and G3, which causes a vibration phenomenon in the core part 50 itself and a collision with peripheral components. There is a problem that the noise is generated in the transformer.

In order to solve this problem, the bobbin 61 formed in the convex portions 51b and 52b located in the center of the first core and the second core is impregnated in the insulating material 81, thereby reducing the shaking of the core portion. 3, there is still a gap C between the first core 51 and the second core 52 and between the insulating material 81 and the core portion 50, There is a limit to remove the mechanical noise due to the tremor below the appropriate level.

The present invention is to solve the various problems, including the above problems, and to provide a transformer for a plasma display device having a structure that prevents the shaking of the transformer itself or the collision between the transformer and the peripheral components. do.

In order to achieve the above object, the present invention is:

Three convex portions formed to be parallel to each other to have an E shape, a core portion having a first core and a second core formed to face each other with a predetermined gap;

A bobbin fitted to enclose a first middle convex portion positioned in the middle of the convex portions of the first core, and a second middle convex portion corresponding to the first middle convex portion;

A coil part wound around the bobbin outer circumferential surface;

An insulation material for embedding the bobbin wound around the coil; And

It provides a transformer for a plasma display device comprising a; noise prevention material for filling a gap between the insulating material and the core portion, and a gap between the first core and the second core.

It is preferable that the noise preventing material includes a polyamine component.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals as in Fig. 2 denote the same members having the same structure and the same function.

As shown in FIGS. 4 and 5, the transformer 100 (hereinafter, referred to as a transformer) for a plasma display device according to an exemplary embodiment of the present invention includes a core part 150, a bobbin 161, a coil part 171, An insulating material 181, and an anti-noise material 190.

The core part 150 is usually made of a silicon steel sheet, permalloy or ferrite, and includes a first core 151 and a second core 152. The first core 151 and the second core 152 have three convex portions, namely, first and second left convex portions 151a and 152a, first and second middle convex portions, respectively, to have an E shape. 151b and 152b, and the 1st and 2nd right convex parts 151c and 152c are formed in parallel. It has a predetermined gap (G1, G2, G3) between the convex portions (151a, 151b, 151c) formed in the first core 151 and the convex portions (152a, 152b, 153c) formed in the second core, The first core 151 and the second core 152 are formed to face each other. Here, the gaps G1, G2, and G3 are determined according to the capacity of the transformer.

The bobbin 161 is fitted into the first middle convex portion 151b positioned in the center of the first core 151 and the second middle convex portion 152b positioned in the middle of the second core 152. Therefore, the bobbin 161 has a shape surrounding the first and second middle convex portions 151b and 152b.

The coil portion 171 is wound around the outer circumferential surface of the bobbin 161. The coil unit 171 may include a primary coil having a voltage flowing into the transformer (not shown), and a secondary coil for generating an induced current by generating current by the primary coil so as to drain the boosted or reduced voltage. Not shown).

The bobbin 161 on which the coil part 171 is wound is impregnated with the insulating material 181 and then buried by the insulating material 181.

Noise prevention material to fill a gap (C) existing between the bobbin 161 and the core portion 150 and the first core 151 and the second core 152 buried by the insulating material 181. Is formed. As a result, the mechanical noise due to the shaking phenomenon or the like caused by the gap is eliminated or at least reduced.

Preferably, the anti-noise material includes a polyamine component, because the polyamine has excellent mechanical properties such as durability and abrasion resistance. This is because a vibration phenomenon of the gap C existing between the first core 151 and the second core 152 and noise due to a collision between peripheral components can be prevented.

 In the present invention having the above configuration, the gap formed between the core portion and the bobbin, and between the first core and the second core does not occur, so that vibration of the core does not occur and consequently there is no mechanical noise. Is reduced, at least.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and any person skilled in the art to which the present invention pertains may have various modifications and equivalent other embodiments. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (2)

Three convex portions formed to be parallel to each other to have an E shape, a core portion having a first core and a second core formed to face each other with a predetermined gap; A bobbin fitted to the core portion to surround a first center convex portion positioned in the center of the first core and a second center convex portion corresponding to the first middle convex portion of the second core; A coil unit having a primary coil and a secondary coil wound on the outer surface of the bobbin; An insulating material for embedding the bobbin in which the coil part is wound; And And a noise preventing material filling a gap between the bobbin in which the insulating material is embedded and the core part, and a gap between the first core and the second core. The method of claim 1, The noise preventing material is a transformer for a plasma display device, characterized in that it comprises a polyamine component.

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