KR20160032540A

KR20160032540A - Surge protect device

Info

Publication number: KR20160032540A
Application number: KR1020140122808A
Authority: KR
Inventors: 한상철; 심재원; 최동훈
Original assignee: 엘지전자 주식회사
Priority date: 2014-09-16
Filing date: 2014-09-16
Publication date: 2016-03-24

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge protection device, and more particularly, to a surge protection device that can be used in connection with a lighting device. According to the present invention, in a surge protection device, a surge voltage input from an AC power source is connected in parallel to an input line for inputting an AC power source, so that at least either one of a live wire and a ground wire, May be provided so that the varistor and arrestor operate together.

Description

[0001] Surge protect device [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge protection device, and more particularly, to a surge protection device that can be used in connection with a lighting device.

Surge refers to excessive waveforms of current, voltage, or power that propagate along a circuit line and have the characteristics of steeply increasing and slowly decreasing.

It is estimated that about 88% of failures due to unknown causes of computer, communication equipment, and lighting are caused by power surges and their transients induced by signal lines and power lines.

Such types of surge include surges by nature, surges by opening and closing and maneuver, surges by static electricity, and surges by nucleus.

Among them, natural surge is lightning strike directly to structure, equipment, electric power line, etc., and directstrike that generates voltage of over 20KV and over-current of several to 200KA or more, transmission line, (Ground fault) caused by grounding potential disconnection due to high voltage and high current flowing through conductor such as power line, communication line, metal pipe embedded in the ground near the lightning point, And discharges that can lead to damage to the equipment, such as electric charges induced by discharges between clouds, flowing into power lines, metallic bodies, or indicators. Among these surges by nature, indirect freckles occur most frequently.

When a surge caused by a lightning stroke occurs in a large city, a rural area, or the like, a high voltage due to a surge in various communication or electric equipment may be induced to cause serious damage such as insulation breakdown. In the past, a surge absorber And a surge protection circuit was constructed to protect various communication and electric devices.

In recent years, light emitting diodes (LEDs), which have advantages such as efficiency, color diversity, and design autonomy, have been attracting attention as a light source of illumination. .

Such a light emitting diode refers to a device that emits light by recombining the minority carriers (electrons or holes) injected using the p-n junction structure of a compound semiconductor. Such a light emitting diode has low power consumption, long life, and can be installed in a narrow space. Therefore, the light emitting diode is used as a display element and a backlight.

The light emitting diode used in such a lighting device is made of a semiconductor and may be vulnerable to the above-mentioned surge.

Therefore, measures for lightning protection are required in the place where the lighting apparatus is installed, and in particular, protection measures against the case where the lighting apparatus is installed in the area where the traffic light, the electric signboard, the streetlight, etc. are installed are desperately required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a surge protection device capable of effectively protecting an electronic device from a surge.

In particular, it is intended to provide a surge protection device that can protect a lighting device using a surge-resistant LED from a surge.

It is also intended to provide a surge protection device in which the life of the surge protection circuit is improved and the surge is not accumulated in the circuit.

According to a first aspect of the present invention, there is provided a surge protection device, which is connected in parallel to an input line for inputting an AC power source to limit a surge voltage input from the AC power source, And at least either one of the neutral line and the ground line may be provided so that the varistor and the arrestor operate together.

Here, the varistor and the arrestor may be connected in series between the live wire and the ground wire, or between at least one of the neutral wire and the ground wire.

In addition, a fuse may be further provided between the live wire and the varistor, and between the neutral wire and the varistor.

At this time, the fuse may be connected to two fuses in parallel.

Meanwhile, an arrestor connected between the live line and the neutral line may be further included.

At this time, the varistor may be connected in parallel with an arrestor connected between the live wire and the neutral wire.

According to a second aspect of the present invention, there is provided a surge protection device connected in parallel to an illumination circuit to limit a surge voltage input from an AC power source, the surge protection device being connected between a live line and a ground line, A varistor that operates preferentially when a surge voltage is input; And a first arrestor for dissipating the remaining voltage when a predetermined voltage is reached after the operation of the varistor.

Here, the second arrestor may further include a second arrestor connected between the live line and the neutral line.

At this time, the second arrestor may be connected in parallel with the varistor.

The varistor may include: a first varistor connected to the live wire; And a second varistor connected to the neutral line side.

At this time, the first arrestor may be connected between the first varistor and the second varistor.

Here, a fuse may be further included in at least one of the live wire and the varistor, and between the neutral wire and the varistor.

The present invention has the following effects.

First, the surge protection device of the present invention effectively dissipates the surge voltage, so that the damage to the circuit connected to the rear end is not accumulated and the use time of the component (varistor) can be greatly increased. That is, it can have a long lifetime even with a high surge voltage of 10 KV or more in total.

Moreover, such a surge protection device can be significantly reduced in cost compared to surge protection performance because the circuit implementation is simple, fewer components are used, and the varistor has a long life.

In addition, if the capacity of the fuse used is changed, it can be used for surge voltages up to 20KV.

Thus, the life of the surge protection device is greatly improved, and the cumulative damage can be removed from the connected circuit.

1 is a circuit diagram showing an example of a surge protection device.
2 is a waveform diagram showing the operating characteristics of the varistor.
3 is a circuit diagram showing another example of the surge protection device.
Fig. 4 is a waveform diagram showing operational characteristics when the varistor and the arrestor operate together. Fig.
5 is a circuit diagram showing an example in which a surge protection device is used in an illumination circuit.
Figs. 6 to 10 are waveform diagrams showing the surge voltage reducing effect when the surge protection device is used in an illumination circuit. Fig.

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

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. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between .

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and / or regions, such elements, components, regions, layers and / And should not be limited by these terms.

1 is a circuit diagram showing an example of a surge protection device.

1, such a surge protection device may be constructed by connecting a plurality of varistors V1, V2, V3 and V4 between a live line L, a neutral line N and a ground line FG .

That is, the varistors V1, V2, V3, and V4 may be provided between the live line L and the neutral line N, between the live line L and the ground line FG, and between the neutral line N and the ground line FG, have.

At this time, two varistors (V1, V2) may be provided between the live line (L) and the neutral line (N).

Such a surge protection device can protect a circuit connected to the rear end when an overvoltage or a surge voltage is applied by using a plurality of varisters (V1, V2, V3, V4).

2 is a waveform diagram showing the operating characteristics of the varistor.

As shown, the varistor has an output voltage waveform B having a portion of the residual voltage waveform (b) attenuated with respect to the input surge voltage waveform (A).

As described above, the varistor can attenuate the surge voltage. However, as shown in Fig. 2, the residual voltage (b) may have a disadvantage in that it lasts for a relatively long period of time. The damage can be accumulated in the area. That is, the voltage / current applied to the power supply element connected to the rear end is relatively large, so that secondary burnout may occur.

Moreover, such a varistor has a one-time life due to its life-time limit. For example, the life of a 20 pi (varistor) varistor is only about 10KV twice. That is, a voltage of 10 KV can be applied twice.

3 is a circuit diagram showing another example of the surge protection device.

3, the surge protection device of the present embodiment includes varistors VA1 and VA2 and an arrestor (not shown) disposed on at least one side between the live line L and the ground line FG and between the neutral line N and the ground line FG. arrestor (SA3) may be provided to operate together.

In this way, the varistor and the arrestor are operated together to be connected in parallel to the input line for inputting the AC power, so that the surge voltage input from the AC power can be attenuated.

3 shows the configuration in which the varistors VA1 and VA2 and the arrestor SA3 are connected between the live line L and the ground line FG and between the neutral line N and the ground line FG, Only one of the varistor and the arrester may be provided to operate.

3, the case where the varistors VA1 and VA2 and the arrestor SA3 are connected between the live line L and the ground line FG and between the neutral line N and the ground line FG will be described .

The varistors VA1 and VA2 and the arrestor SA3 may be connected in series between the live line L and the ground line FG and between the neutral line N and the ground line FG.

That is, an arrestor SA3 connected to the ground line FG is connected between the first varistor VA1 connected to the live wire L and the second varistor VA2 connected to the neutral wire N side.

The first varistor VA1 and the arrestor SA3 are connected in series between the live line L and the ground line FG and the second varistor VA2 is connected between the neutral line N and the ground line FG. And an arrestor SA3 are connected in series.

On the other hand, arrestors SA1 and SA2 may be further provided between the live line L and the neutral line N. [ Hereinafter, an arrestor indicated by SA3 is referred to as a first arrestor SA3, and an arrestor connected between a live line L and a neutral line N is referred to as a second arrestor SA1 or SA2.

The first varistor VA1 and the second varistor VA2 may be connected in parallel with the second arrestors SA1 and SA2 connected between the live line L and the neutral line N, respectively.

Here, although the second arrestor shows a configuration in which two arrestors SA1 and SA2 are connected, it is needless to say that a single arrestor may be provided.

Fuses F1, F2, F3 and F4 may be further provided on at least one of the live wire L and the first varistor VA1 and between the neutral wire N and the second varistor VA2.

At this time, as shown in the figure, the fuses of the two fuses (F1 / F2, F3 / F4) can be connected to each other in parallel. In some cases, a fuse may be provided between the live wire L and the first varistor VA1, and between the neutral wire N and the second varistor VA2.

Fig. 4 is a waveform diagram showing operational characteristics when the varistor and the arrestor operate together. Fig.

As shown in the waveform diagram of FIG. 4, since the varistor has a very high operating characteristic, the first varistor VA1 and the second varistor VA2, which are respectively positioned between the live line L and the ground line FG, the neutral line N and the ground line FG, 2 The varistor VA2 first operates on the surge voltage to cancel out the surge voltage like the waveform of C.

Thereafter, when the canceled voltage reaches a certain voltage, the first arrestor SA3 operates to destroy the remaining residual voltage like the D waveform. This first arrestor SA3 operates so that only a short residual voltage waveform d remains, and this waveform d immediately disappears.

Therefore, since the surge voltage effectively dissipates, no damage is accumulated in the circuit connected to the subsequent stage, and the use time of the varistors VA1 and VA2 can be greatly increased.

The second arrestors SA1 and SA2 directly connected between the live line L and the neutral line N can minimize the residual voltage for a surge voltage of about 3 KV or more between the live line L and the neutral line N have.

Therefore, such a surge protection device can have a long life even for a surge voltage higher than 10 KB in total.

Moreover, such surge protection devices can be significantly reduced in cost compared to surge protection because the circuit implementation is simple, fewer components are used, and the varistors have a long life.

Further, if the capacities of the fuses F1, F2, F3 and F4 to be used are changed, they can be used for surge voltages up to 20K.

5 is a circuit diagram showing an example in which a surge protection device is used in an illumination circuit.

As shown, the surge protective device 100 as described above can be used in connection with the illumination circuit 200. [

The surge protector 100 may remove a surge voltage that may be applied to a switching power supply (not shown) included in the illumination circuit 200. In addition, when used together with the surge protection circuit included in the switching power source unit, the semiconductor device included in the switching power source unit can be effectively protected.

5, the surge protector 100 may be connected in parallel with the illumination circuit 200. [ The circuit shown in Fig. 5 may have substantially the same configuration as the circuit of Fig.

However, the live line L may be connected to the illumination circuit 200 through a separate fuse F5. The neutral line N is connected to the illumination circuit 200 and the components of the surge protection device 100 may be connected in parallel to the portion where the neutral line N and the illumination circuit 200 are connected.

The same elements as those described with reference to Fig. 3 can be applied to other parts not described.

Hereinafter, referring to FIGS. 6 to 10, the surge voltage suppressing effect when the surge protection device described above is used in an illumination circuit will be described as follows.

First, when a surge voltage waveform as shown in FIG. 6 is applied, a residual voltage waveform as shown in FIG. 7 can be produced through a surge protection device as described with reference to FIG. 1 or a surge protection device using a single structure of a varistor.

That is, the residual voltage having the pulse width and amplitude as shown in Fig. 7 can be applied to the illumination circuit side.

This residual voltage can be in the state shown in FIG. 8 when the internal surge protection device of the lighting circuit is turned on. That is, the amplitude of the residual voltage can be made smaller than that in FIG. 7, but the duration thereof is not greatly reduced.

In this way, even when the internal surge circuit is passed through, the residual voltage waveform such as E can affect the illumination circuit.

Therefore, such a residual voltage may act as damage to the illumination circuit side, and in this process, the varistor may be damaged, so that the life of the surge protective device may be shortened.

Fig. 9 shows the residual voltage of the surge protection device described with reference to Figs. 3 to 5. Fig.

When the surge voltage waveform as shown in Fig. 6 is applied to the surge protection device described with reference to Figs. 3 to 5, the residual voltage waveform as shown in Fig. 9 can be produced.

Thus, it can be seen that the amplitude and the pulse width of the residual voltage waveform are greatly reduced, and in particular, the pulse duration is greatly reduced.

This residual voltage can be in the state as shown in FIG. 10 when the internal surge protection device of the lighting circuit is turned on. That is, it can be seen that the residual voltage applied to the illumination circuit is significantly attenuated as indicated by F.

That is, as described above, the varistor and the arrestor may operate together to greatly reduce the amplitude and the pulse width of the residual voltage, so that the illumination circuit may be hardly damaged.

In addition, the life span can be greatly increased as compared with the surge protection device implemented using only the varistor described above, and a surge protection device capable of attenuating a high voltage of 20 KV or more can be realized.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: Surge protection device 200: Lighting circuit
F1, F2, F3, F4, F5: Fuse
VA1, VA2: Varistors SA1, SA2, SA3: Arrestors

Claims

A surge protection device comprising:
A surge voltage input from the AC power source is connected in parallel to an input line for inputting an AC power source so that at least either one of the live wire and the ground wire or between the neutral wire and the ground wire is provided so that the varistor and the arrestor operate together Wherein the surge protection device comprises:

The surge protector according to claim 1, wherein at least one of the live wire and the ground wire, and between the neutral wire and the ground wire, the varistor and the arrestor are connected in series.

The surge protection device according to claim 1, wherein a fuse is further provided between at least one of the live wire and the varistor and between the neutral wire and the varistor.

4. The surge protection device of claim 3, wherein the fuse is connected in parallel with two fuses.

The surge protection device of claim 1, further comprising an arrestor connected between the live wire and the neutral wire.

6. The surge protection device of claim 5, wherein the varistor is connected in parallel with an arrestor connected between the live wire and the neutral wire.

A surge protection device connected in parallel to an illumination circuit to limit a surge voltage input from an AC power source,
A varistor connected between the live wire and the ground wire and connected between the neutral wire and the ground wire to operate preferentially when a surge voltage is input; And
And a first arrestor for extinguishing the remaining voltage when the voltage reaches a predetermined voltage after the operation of the varistor.

The surge protection device of claim 7, further comprising a second arrestor connected between the live wire and the neutral wire.

The surge protection device according to claim 8, wherein the second arrestor is connected in parallel with the varistor.

8. The varistor according to claim 7,
A first varistor connected to the live wire side; And
And a second varistor connected to the neutral line side.

11. The surge protection device according to claim 10, wherein the first arrestor is connected between the first varistor and the second varistor.

The surge protection device according to claim 7, further comprising a fuse between at least one of the live wire and the varistor and between the neutral wire and the varistor.