KR100556784B1 - A dielectric substance for discharge tube - Google Patents

Abstract

The present invention relates to a high voltage distributor for lighting one or more discharge tubes, and more particularly, by molding an epoxy resin in a case containing a plurality of dielectrics and extending the surface distance between electrodes attached to both ends of the dielectric. The present invention relates to a dielectric for a discharge tube that prevents corona discharge and increases the bursting extreme voltage to maintain a constant illuminance without flickering of neon signs.

The discharge tube dielectric according to the present invention for achieving the above object is a corona discharge generated in the dielectric when a high voltage is applied to the dielectric by arranging a plurality of dielectrics in the case, by embedding the epoxy resin in the case and molding Characterized in that to prevent.

Neon tube, neon sign, distributor, dielectric, discharge tube, corona discharge, burst extreme voltage, surface corona

Description

A dielectric substance for discharge tube

1 is a view for schematically showing a dielectric for a discharge tube according to the present invention.

Figure 2 is a perspective view for comparison of the dielectric of the prior art and the present invention.

Figure 3 is a front view of the dielectric for discharge tube according to the present invention.

4 is a plan view of a plurality of dielectrics arranged in a case according to the present invention;

5 is a perspective view of a case of a dielectric for discharge tube according to the present invention;

6 is a sectional view of a dielectric for a discharge tube according to the present invention;

7 is a view showing the position and the surface area of the electrode of the dielectric for discharge vessel according to the present invention.

Explanation of symbols on main parts of drawing

1000: distributor for discharge tube

10: case 12: epoxy resin

14: support jaw 16: fixed jaw

50: high voltage transformer

100: dielectric 102: first step

104: second step 110: first electrode

112: second electrode

120: first margin 130: second margin

200: common electrode leader line 300: individual electrode leader line

400: discharge tube

The present invention relates to a high voltage distributor for lighting one or more discharge tubes, and more particularly, by molding an epoxy resin in a case containing a plurality of dielectrics and extending the surface distance between electrodes attached to both ends of the dielectric. The present invention relates to a dielectric for a discharge tube that prevents corona discharge and increases the bursting extreme voltage to maintain a constant illuminance without flickering of neon signs.

In general, a neon lamp or neon sign used for lighting and advertisement is installed with a cold cathode electrode at both ends of a glass tube having a diameter of about 1 cm in which argon (Ar) or neon (Ne) gas of low pressure is enclosed. By using a driving device called a neon transformer to the both electrodes, a sinusoidal alternating current high voltage of 20 to 50 kW cycles and a maximum voltage of 3 to 30 kV is applied to generate a discharge in the glass tube, and is discharged from the both electrodes. Discharge is maintained by the secondary electrons, in which visible light is directly obtained from the plasma formed in the glass tube (red neon lamp), or ultraviolet rays generated from a small amount of mercury vapor encapsulated in the glass tube are coated on the inner surface of the tube. To get visible light (other colored neon lights).

In the conventional neon transformer, the AC 220V current is input to the rectifier to rectify the DC current, and the current is switched to a frequency waveform of several tens of kHz at the switching unit, or LC resonance is performed at the LC resonance unit, and the boost transformer is used. It was composed of a circuit for boosting the output to a high voltage of 3 ~ 30kV.

The rated output voltage of the neon transformer depends on the total length of the tubes or the number of tubes used. Conventionally, when driving a plurality of neon tubes at the same time, a neon transformer is used that connects the tubes in series and outputs a high voltage in proportion to the number of tubes. However, two problems have been pointed out in the driving method of the series neon tube as described above.

Iii) Short life due to sputtering of electrodes. That is, since metal electrodes are installed at both ends of the tube, when the metal is sputtered by the collision of high energy ions and the discharge of secondary electrons during discharge, the valence of the material is strongly imparted to the material. Protruding phenomenon) Blackening occurs when the metal atoms that have been torn apart are combined with the oxidizing material in the tube and adhere to the tube wall around the electrode.

In addition, the electrode itself is gradually oxidized in combination with the oxidizing gas and the material remaining in the tube, thereby gradually increasing the discharge start voltage. Due to these two causes, the life of the tube is reduced. The blackening problem of the discharge tube is a common problem of most internal electrode type discharge tubes as well as neon tubes.

Ii) The danger of high voltage due to series operation. Neon tubes are converted into resistive loads by forming a capacitive load before discharge or by forming a plasma inside the tube where direct current can flow during discharge. Therefore, as the capacitive load is changed into the resistive load, a large voltage drop occurs in the driving circuit, and the neon transformer is 30 to 40% lower than the voltage of the output terminal during no operation.

Furthermore, when driving multiple neon tubes, there is a problem in that the length of the neon tubes is limited because the tubes must be connected in series and the output voltage higher than the voltage drop of each tube must be output from the neon transformer.

For the same reason as above, the neon sign device carries various risks due to high voltage. Specifically, since high voltage is applied to the final terminal during operation, high-energy electromagnetic waves are radiated to the surroundings, causing harm, and there is a risk of safety accidents due to terminal short-circuit and short circuit, etc. Since the power efficiency is different, there was a problem in the construction difficult.

The prior art for solving the above problems is well represented in the "electronic neon tube lighting circuit" of Republic of Korea Utility Model Publication No. 20-0196774.

The technique shown in the Republic of Korea Utility Model Publication No. 20-0196774 is a high-frequency signal by converting a DC voltage to a high-frequency signal to turn on a low voltage to minimize power consumption, by connecting several neon tubes in parallel to turn on any of the neon tubes Even if one is not lit, the other neon tube is lit, so that the advertisement function of the sign is stably performed, but there were the following problems.

In the prior art as described above, when the neon tubes are operated in parallel, the internal resistance of each neon tube configured in parallel is slightly different, so that the current flows intensively into the neon tube with a small internal resistance, thereby shortening the life of the neon tube. There was a problem letting.

In addition, when the distributor required for parallel operation of neon tubes is used in the air, there is a problem that partial breakdown of insulation occurs due to corona discharge, weakening the output of the distributor, darkening the illuminance of the neon discharge tube, and partially flickering.

The present invention has been proposed to solve the above problems, the potential hardness of the corona discharge is initiated by blocking the electrode and the air attached to both ends of the dielectric by molding by incorporating a molding process with an epoxy resin in a case containing a plurality of dielectrics And to increase the voltage.

In addition, by molding a case in which a plurality of dielectrics are housed with an epoxy resin and molding, the inside of the case is sealed to maintain the weather coefficient of the electrode of the dielectric and the surface state of the conductor at an optimum value, thereby maintaining a high rupture limit voltage. This is to prevent current leakage by corona discharge.

In addition, an electric field is formed around the lead line of the dielectric material upon application of a high voltage, in order to prevent surface corona, which is a phenomenon occurring on the surface between the electrode and the electrode of the dielectric as the particles and molecules of air are ionized in the electric field. It is an object to extend the surface distance between electrodes in each dielectric.

It is also an object to fix the lead wire of the dielectric and the case by the epoxy molding case.

The discharge tube dielectric according to the present invention for achieving the above object is a corona discharge generated in the dielectric when a high voltage is applied to the dielectric by arranging a plurality of dielectrics in the case, by embedding the epoxy resin in the case and molding Characterized in that to prevent.

Referring to the term used continuously in this specification, when a voltage is applied to each of the two electrodes attached to both ends of the dielectric, an electric field is formed, and by this principle, dielectric polarization occurs in the dielectric according to Coulomb's law. . Due to the dielectric polarization, -charge is excessive on one electrode, + charge is excessive on the other electrode, and when their electric fields are changed with each other, the polarization phenomenon is reversed to generate a displacement current.

Therefore, the "dielectric" is an insulator having a very high dielectric constant, and no current flows through the dielectric, but a displacement current caused by electric force lines is generated by the dielectric polarization phenomenon so that the alternating current becomes a current.

On the other hand, "corona discharge" refers to a phenomenon in which only a strong electric field emits light when a high voltage is applied between two electrodes. Corona loss is caused by the corona discharge.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 1, the discharge tube distributor 1000 according to the present invention includes a plurality of dielectrics 100 having high voltage transformer 50, a case 10, and first and second electrodes 110 and 112 attached to both ends thereof, respectively. ), The common electrode leader line 200, the individual electrode leader line 300, and the discharge tube 400.

As shown in Fig. 1 to Fig. 4, the case 10 accommodates a plurality of dielectrics 100, and is composed of a tetrahedron resin.

Since the dielectric 100 in the case 10 has a slim compact type for use, a streamer corona phenomenon occurs between terminals of each dielectric 100 element when a high voltage is applied.

As a result, the streamer corona develops into sparks, resulting in a large loss of electrical energy. In this process, the temperature of ions emitted is similar to that of the atmosphere or the temperature of electrons is high, so the low temperature plasma phenomenon (Non- Thermal Plasma) causes the temperature of the surface of the dielectric to rise, accelerating the degradation of the output.

Therefore, in order to prevent this and maximize the lighting efficiency of the discharge tube 400, an insulator having an insulation strength of 3000 V or more per 1 mm thickness by injecting and curing a resin having flame retardancy, excellent mechanical properties, excellent electrical properties, and excellent chemical resistance to microcavities (epoxy ) Is provided on the inner wall of the case 10.

In addition, as shown in FIG. 5, the case 10 includes a common electrode lead line 200 and an individual electrode lead line 300 connected to the first and second electrodes 110 and 112 of the dielectric 100, respectively. Maintaining a distance of about 1mm to solder to serve to fix the case 10.

After soldering and fixing as described above, the epoxy resin 12 is embedded into the case 10 to be molded and cured by radiant heat at 45 ° C. for about 4 hours.

The epoxy resin 12 is a low-viscosity liquid, and thus, has a good filling property of microcavities, good chemical resistance, and good mechanical properties. The epoxy resin 12 can be made compact and lightweight, and economical. There is a characteristic that can be stabilized electrically.

In addition, after the molding, the inside of the case is maintained in a vacuum state by pumping using a vacuum chamber to remove moisture or air remaining between the electrode and the electrode.

Therefore, the cured solid epoxy resin 12 is a high insulator, thereby increasing electrical insulation between the dielectrics 100 to prevent surface corona and streamer corona and sparks between the two poles.

2 to 3, the dielectric 100 has a predetermined volume and is arranged in parallel in the case 10. The present invention is implemented using a tetrahedral dielectric 100. However, it may be any shape such as a tetrahedron or a cylinder.

The dielectric material 100 must satisfy the conditions of the relative dielectric constant to satisfy the condition that the high-voltage transformer 50 and the discharge tube 400 to be matched, easy to install, and miniaturized.

Therefore, the dielectric material 100 is an insulator having an insulation resistance close to infinity at a number of 1000 MΩ, and should be a dielectric having a high relative dielectric constant. A mixture of TiO2 and ceramics, a mixture of TiO2 + MgO and a ceramic, a mixture of TiO2 and BaO and a ceramic, a mixture of BaTiO3 alone or a mixture of at least one or more are used.

As described above, the dielectric 100 manufactured as described above is made of a hexahedron, as shown in FIGS. 112 is attached, one side is formed with a first step 102 for extending the bottom surface distance between the first electrode and the second electrode in the corner in contact with the bottom.

The other side surface is formed with a second step 104 at an angle opposed to the first step 102, and the second step 104 has an upper portion between the first electrode 110 and the second electrode 112. In order to extend the surface distance, the upper side and the other side are formed at the corners in contact with each other.

In addition, the first electrode 110 is attached to the one side surface to the left side of the one side.

The second electrode 112 is alternately attached to the other side of the second electrode 112 to face the first electrode 110, and the second electrode 112 is biased to have a second margin 130 on the left side of the other side. Attached.

The first electrode 110 has a surface area of 1/2 or more of the total area of one side, but preferably has a surface area of 3/4 of the total area of one side, and the first and second margins 120 and 130. Is formed in about 1/4 of the width of the one side and the other side.

That is, the first electrode 110 is attached to one side of one side of the bias, so that the distance between the first electrode 110 and the second electrode 112 is extended by the first margin to suppress the surface corona phenomenon. do.

In addition, since the second electrode 112 is also attached to one side of the other side, the distance between the first electrode 110 and the second electrode 112 is extended by the second margin 130 so that the surface corona phenomenon can be extended. Will be suppressed.

In addition, the volume of the space formed by the first and second steps 102 and 104 is formed in about 1/16 of the volume of the entire dielectric.

The distance extension between the first and second electrodes 110 and 112 by the first and second margins will be described in more detail in an embodiment to be described later.

Meanwhile, the common electrode leader line 200 is electrically connected between the first electrodes 110 of the dielectric 100 to receive power from the outside, and each of the second electrodes 112 of the dielectric 300. The individual electrode leader line 300 is drawn out to be electrically connected to the discharge tube 400.

The dielectric material 100 receives power from the outside by using the common electrode lead line 200. An AC input unit of AC 220V, a rectifying unit providing a direct current of 310V, an alternating current and direct current are applied, and a half bridge switching unit. And a pulse generator for providing a two-gate signal with a 1/4 LC resonant period, a half bridge switching unit for recovering zero voltage switching and reactive power, and a high voltage transformer for voltage boosting.

Therefore, the common electrode leader 200 receives power from the voltage high voltage transformer 50 and is connected to the first electrode 110 of each dielectric 100 to supply power.

In addition, the individual electrode lead lines 300 drawn from the second electrode 112 of the dielectric 100 are connected to the discharge tube 400 to be described later to operate the discharge tube 400.

And the dielectric 100 is supported and fixed by at least one support in the case 10, as shown in Figure 6, the support is formed on the bottom surface inside the case.

The support part is composed of a support jaw 14 and the fixing jaw 16, the case 10 is formed on the bottom surface of the case 10 continuously as a rail like a case

The support jaw 14 supports the lower left end of the dielectric 100, and has a triangular pyramid shape so that the end is sharply formed so as to be less affected by the surface corona flowing through the surface.

The fixing jaw 16 supports the lower right corner of the dielectric 100, and a stepped jaw is formed to support the edge of the dielectric 100 so as not to be separated to the right. Therefore, the support part can maintain the gap between the dielectric material 100 and is fixed to the case 10.

The discharge tube 400 discharges in the glass tube and maintains the discharge by the secondary electrons emitted from both electrodes. At this time, the visible light is directly obtained from the plasma formed in the glass tube (red neon lamp) or the glass tube. Ultraviolet rays generated from a small amount of mercury vapor enclosed inside excite the phosphor coated on the inner surface of the tube to obtain visible light (other colored neon lamps).

Hereinafter, the electrical characteristics of the dielectric 100 according to the present invention will be described.

The dielectric material 100 has a small size and a close structure in the case 10. When a high pressure is applied, an electric field is formed around each lead line, and air particles and molecules in the electric field are ionized to clean the surface of the dielectric material 100. Riding surface corona is generated and leakage current is generated.

First, the dislocation hardness at which the corona is initiated is Ec

Ec: dislocation hardness at which corona is initiated

δ: relative air density

r: radius of conductor

It is δ that determines the value of Ec.

Therefore, by molding the case 10 containing the dielectric material 100 with an epoxy resin 12 and sealing the case, δ becomes a minimum value, and the potential hardness at which the corona is started is increased to prevent leakage current.

And ii) the voltage Vc at which the corona is initiated.

Ec: dislocation hardness at which corona is initiated

r: radius of conductor

d: distance between conductors

In this case, since r and d have a limit, the Ec value influences Vc, so that the leakage current can be prevented by increasing the value of Ec, which is the potential hardness at which the corona of vi) starts.

Disrupt) disruptive critical voltage: Vo

: 날씨에 관한 계수, 맑은 날은 1, 안개 시는 0.8

: Coefficient for weather, 1 for sunny days, 0.8 for fog

: 도체의 표면 상태 1 ∼ 0.8

: Surface state of conductor 1 to 0.8

_,

을 1로 유지하여 파열극한전압을 높게 유지시킴으로써 코로나방전에 따른 누설전류를 방지하고, 스트리머 코로나로 발전하는 것을 원천적으로 방지하게 된다.Here too, as the inside of the case 10 is molded with an epoxy resin 12

_,

By maintaining a value of 1 to keep the bursting limit voltage high, it is possible to prevent leakage current due to corona discharge and to prevent power generation into the streamer corona.

Therefore, even with the application of thousands of volts of alternating current, withstand voltages of 2 to 2.5 times higher than that of homogeneous ceramic capacitors.

In the above, the electrical characteristics of the case 10 having the dielectric 100 are molded are described. Hereinafter, the surface corona is extended by extending the surface distance between the first and second electrodes 110 and 112 of the dielectric 100. An embodiment of suppression will be described.

Referring to the shape of the conventional dielectric 1, as shown in FIG. 2, it can be seen that the distance between the first electrode and the second electrode is l ₁ and is equal to l ₂ .

However, in the dielectric 100 according to the present invention, first and second steps 102 and 104 are formed.

Here, assuming that the height and width of the first step 102 are the same, the height is b, the width is c, and the front width is a.

l ₁ = l ₂

L ₁ = a + b + c

L ₂ = a ₁ + b ₁

The surface distance between the electrodes of the dielectric material 100 of the present invention is L ₁ = L ₂ .

Where l ₁ + b (the height of the step) = L ₁ ,

l ₂ + b ₁ (length of the other side) = L _2, so

및

으로 정하면,

And

If set to,

1.25l ₁ = L ₁

1.25l ₂ = L ₂ is established.

That is, the distance between the electrodes in the same size is longer by the length "b" in the upper and lower parts, and by the length "b ₁ " in the side.

이 최적의 값임을 알 수 있다.Therefore, as shown in FIG. 7, if the lengths of "b" and "b ₁ " are too large, the cross-sectional area of the dielectric material 100 becomes small, and if it is too large, the efficiency of the distance between electrodes decreases, so that the values of "b" and "b ₁ " silver

It can be seen that this is the optimal value.

As a result, by extending the distance between the electrodes of the dielectric material 100 as described above, it is possible to use the high frequency, high voltage, high withstand voltage while having a very small volume by preventing the surface corona phenomenon and increasing the rupture limit voltage.

Referring to the operating state of the discharge tube distributor 1000 according to the present invention configured as described above are as follows.

As shown in FIG. 1, the discharge tube distributor 1000 according to the present invention receives a common power from the high voltage transformer 50 by using the common electrode lead wire 200, and the common electrode lead wire 200 is The first electrode 110 of the dielectric 100 is connected to each other.

Next, after the predetermined voltage to be supplied to the discharge tube 400 is distributed by the dielectric material 100, the discharge tube 400 is used by using the individual electrode lead wires 300 drawn from the second electrode 112 of the dielectric material 100, respectively. Will be connected with

Accordingly, the first and second margins 120 and 130 and the first and second steps between the dielectric 100 accommodated in the molded case 10 and the first and second electrodes 110 and 112 of the dielectric 100 are formed. By extending the surface distances of the upper, lower, and side surfaces by (102, 104), the potential hardness, voltage and burst limit voltage at which the corona is started are kept high.

Therefore, by preventing the leakage current caused by the surface corona, the streamer corona, and the spark generated from the dielectric and supplying the power to the discharge tube 400 more stably, the illumination of the discharge tube 400 is kept constant, causing flickering and extinction. To prevent this.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the following claims. Until the technical spirit of the present invention will be said.

According to the present invention having the above-described configuration, by inserting an epoxy resin into a case containing a plurality of dielectrics by molding and blocking the electrodes and air attached to both ends of the dielectric to increase the potential hardness and voltage to start the corona discharge It works.

In addition, by molding a case in which a plurality of dielectrics are housed with an epoxy resin and molding, the inside of the case is sealed to maintain the weather coefficient of the electrode of the dielectric and the surface state of the conductor at an optimum value, thereby maintaining a high rupture limit voltage. By doing so, there is an effect of preventing current leakage due to corona discharge.

In addition, by extending the surface distance between the electrode and the electrode in each dielectric, there is an effect of preventing the surface corona, which is a phenomenon occurring on the surface between the electrode and the electrode of the dielectric.

In addition, there is an effect of fixing the lead wire of the dielectric and the case by the epoxy molding case.

Claims (6)

In the dielectric for the discharge tube, A dielectric for a discharge tube, characterized in that a plurality of dielectrics are arranged in a case, and an epoxy resin is embedded in the case to cause molding to prevent corona discharge occurring in the dielectric when a high voltage is applied to the dielectric. The method of claim 1, The dielectric is made of a hexahedron, one side is attached to the first electrode and the other side is attached to the second electrode, One side surface is formed with a first step for extending the bottom surface distance between the first electrode and the second electrode in the corner in contact with the lower, On the other side, a second step is formed at an angle opposed to the first step, and the second step is formed at an edge where the top and the other side contact each other in order to extend the top surface distance between the first electrode and the second electrode. The first electrode is attached to one side so as to be biased so that a first margin is formed on the left side of the one side to extend the side surface distance between the first electrode and the second electrode. The second electrode is alternately attached to the surface opposite to the first electrode on the other side, and the second electrode has a second margin for extending the side surface distance between the first electrode and the second electrode on the left side of the other side. Discharge tube dielectric, characterized in that attached to be biased. The method of claim 2, The first and second margins, the dielectric for discharge tube, characterized in that formed in about 1/4 of the width of one side or the other side. The method of claim 2 The volume of the space formed by the first and the second step is a discharge tube dielectric, characterized in that about 1/16 of the volume of the entire dielectric. The method of claim 2, A common electrode lead line electrically connected to the first electrodes to receive power from the outside; And The dielectric for a discharge tube, characterized in that it comprises an individual electrode lead line which is drawn out from the second electrode and connected to one end of the discharge tube. The method according to any one of claims 1 to 5, Discharge tube dielectric, characterized in that at least one support is formed on the inner bottom surface of the case to maintain a gap between the dielectric and fixed to the case.

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