KR101936709B1 - Protection device for open mode and electric apparatus with the same - Google Patents

Abstract

An open-mode protection device and an electronic device having the same are provided. An open mode protection device according to an embodiment of the present invention is an open mode protection device connected in parallel to a load made up of a constant current source and an LED. The open mode protection device includes a constant current source and a first external electrode connected to one side of a load. A second external electrode connected to the other side of the constant current source and the load and to the ground; A protective unit for bypassing an overvoltage or an overcurrent flowing into the first external electrode to the ground through the second external electrode; And a current suppressing part connected in series with the protecting part and detecting a temperature or a current of the protecting part to reduce the current of the protecting part as the temperature or the current increases.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an open-mode protection device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an open mode protection device and an electronic device having the same, and more particularly to an open mode protection device capable of suppressing abnormal overheating of a protection device due to an open mode operation of a load and an electronic device will be.

Recently, the use of LEDs as a lighting device has become commonplace. In particular, the use of LEDs has been increasing in the fields of backlight of display devices, various lamps of automobiles, smart lighting using dimming, etc., due to efficiency of illumination and ease of control.

Such an LED illumination has a constant current type lighting circuit for providing a constant current to a load made of LED. In such a constant current system, a constant current is supplied from the constant current source in a steady state, and the LED is turned on to have a constant voltage value. For example, when the constant current source supplies a current of 400 mA and the load is composed of 10 LEDs, a voltage of 25 to 30 V is output.

Here, a protective device is provided to protect the circuit when electrostatic discharge (ESD), electrical over stress (EOS), or surge flows between the constant current source and the load. At this time, the protection device is connected to the ground at one side and bypasses the ESD, EOS or surge introduced to the ground side.

In such a constant current electronic device, if the shelter fails to sufficiently bypass the ESD, EOS or surge, any one of the LEDs loaded by ESD (static electricity), EOS or surge is broken and the load is open Often occurs. At this time, the current supplied from the constant current source flows to the protection element because the load is open. Thus, since the constant current source is provided in the constant current source, the voltage becomes a condition to rise to infinity. In other words, the protection device continuously increases its voltage until a constant current provided from the constant current source flows.

At this time, a high voltage and a high current continuously flow into the protection device, thereby raising the temperature of the protection device itself. In severe cases, the protection device itself may be broken or ignited to cause a fire. Particularly, in the case where materials easily ignited such as a white sheet on which LEDs are arranged in a TV backlight are adjacent to each other, there is a great possibility of occurrence of fire.

Therefore, there is an urgent need to develop a technology capable of preventing ESD, EOS, or surge from being overheated by an open mode of the load, as well as protecting the LED load from overheating.

KR 1005199 B (December 24, 2010 Enrollment)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an open mode protection device capable of suppressing abnormal overheating of a protection device due to a constant current source when the load is in an open mode and an electronic device having the same. There is a purpose.

In order to solve the above-described problems, the present invention provides an open mode protection device connected in parallel with a load made up of a constant current source and an LED. Wherein the open mode protection device comprises: a first external electrode connected to one side of the constant current source and the load; A second external electrode connected to the other side of the constant current source and the load and the ground; A protection unit for bypassing an overvoltage or an overcurrent flowing into the first external electrode to the ground through the second external electrode; And a current suppression unit connected in series with the protection unit and sensing a temperature or current of the protection unit to reduce the current of the protection unit as the temperature or the current increases.

According to a preferred embodiment of the present invention, the body of the protection part is made of a varistor material, and the body of the current suppressing part is made of a PPTC material or a PTC material.

At this time, each of the protective portion and the current suppressing portion may be connected to any one of the first external electrode and the second external electrode.

As an example, each of the protection unit and the current suppression unit may be a single body.

As another example, the protective portion may include a plurality of sheet layers, a first inner electrode and a second inner electrode spaced apart from each other by a predetermined distance, and a connection electrode connected to the second inner electrode, And the connection electrode may be disposed in contact with a part of the current suppressing portion.

At this time, the first internal electrode may be connected to any one of the first external electrode and the second external electrode.

As another example, the current suppressing portion may be formed of two and connected to the first external electrode and the second external electrode, respectively, and the protecting portion may be disposed between the two current suppressing portions.

At this time, the protection unit may include first and second internal electrodes on both sides, and the first internal electrode and the second internal electrode may be disposed in contact with a part of the current suppressing unit.

As another example, the body of the open mode protection element may be formed of a plurality of sheet layers, and the protective portion may include a first internal electrode and a common electrode disposed opposite to the first internal electrode at a certain distance, The suppression portion includes a second internal electrode disposed opposite to the common electrode at a certain distance from the common electrode. The first internal electrode and the second external electrode are formed on both sides of the sheet layer, And an insulating member.

At this time, each of the first internal electrode and the second internal electrode may be connected to any one of the first external electrode and the second external electrode.

The current suppressing unit may be any one of a bimetal, a fuse, a polymeric positive temperature coefficient (PPTC) device, and a positive temperature coefficient (PTC) device.

The protection unit may be a varistor, a suppressor, a gas discharge tube (GDT), or a diode.

On the other hand, the present invention relates to a constant current source; A load consisting of an LED driven by the constant current source; A ground terminal to which the constant current source and one side of the load are connected; And an open mode protection element connected in parallel to the constant current source and the load, respectively, and having one side connected to the ground terminal.

According to a preferred embodiment of the present invention, the constant current source may be any one of a constant current driving unit and a constant current power source.

According to the present invention, by forming the current suppressing portion composed of the PTC element or the PPTC element integrally with the protecting portion, by detecting the overcurrent or abnormal temperature rise of the protecting portion due to the open mode operation of the load, It is possible to prevent breakage of the protection device itself due to abnormal overheating.

Further, the present invention suppresses abnormal overheating of the protection device itself, thereby preventing damage to adjacent circuit components and preventing a fire due to ignition of the protection device.

Further, since the current suppressing portion and the protecting portion are provided as a single body, it is not necessary to provide the internal electrode, so that the production efficiency can be improved by a simple structure and the production can be made at low cost.

In addition, according to the present invention, since the protective portion is disposed between the two current-suppressing portions, the protection portion can be made thin and the operating voltage can be lowered, so that the protection function against overvoltage or overcurrent can be improved.

1 is a cross-sectional view of an example of an open mode protection device according to an embodiment of the present invention,
FIG. 2 is an equivalent circuit diagram of the open mode protection device of FIG. 1,
FIG. 3 is a graph showing temperature characteristics of the open mode protection device of FIG. 1,
FIGS. 4 and 5 are cross-sectional views of another example of an open-mode protection device according to an embodiment of the present invention and an exploded perspective view showing a stacking relationship of a plurality of sheet layers in the protection portion,
6 and 7 are a cross-sectional view and an exploded perspective view of still another example of an open mode protection device according to an embodiment of the present invention,
8 and 9 are cross-sectional views of another example of an open-mode protection device according to an embodiment of the present invention and an exploded perspective view showing a stacking relationship of a plurality of sheet layers,
10 is a schematic diagram of an electronic device having an open mode protection device according to an embodiment of the present invention.
11 is a view for explaining a normal operation of a load in the electronic apparatus of Fig. 10,
12 is a diagram for explaining the open mode operation of the load in the electronic device of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1, an open mode protection device 100 according to an embodiment of the present invention includes a first external electrode 101, a second external electrode 102, a protection portion 110, (120).

This open mode protection element 100 is used in an electronic device. By connecting the ESD, EOS, or surge current, which is connected in parallel to the load consisting of the constant current source and the LED respectively, by bypassing the ground, the circuit including the constant current source and the load is protected.

The first external electrode 101 is connected to one side of the constant current source and the load of the electronic device. That is, the first external electrode 101 may be connected to one end of the constant current source and one end of the load.

The second external electrode 102 is connected to the other side of the constant current source and the load of the electronic device. That is, the second external electrode 102 may be connected to the other end of the constant current source and the other end of the load. Here, the other side of the constant current source and the other side of the load are connected to the ground, whereby the second outer electrode 102 is also connected to the ground.

The first external electrode 101 and the second external electrode 102 may be disposed on both sides of the open mode protection element 100, respectively.

The protection unit 110 bypasses an overvoltage or an overcurrent flowing into the first external electrode 101 through the second external electrode 102 to the ground of the electronic device.

The protective portion 110 may be formed of a single body 110a and the body 110a may be formed of a varistor material. As another example, the body 110a may be made of a body. Wherein the body comprises at least one of ZnO, BaTiO ₃ , and SrTiO ₃ and at least one of Pr, Bi, Ni, Mn, Cr, Co, Sb, Nd, Si, Ca, La, Mg, Y may be contained as a dopant.

The protection unit 110 may function as a varistor for bypassing overvoltage or overcurrent to ground.

The current suppressing unit 120 is connected in series with the protecting unit 110 and senses the temperature or current of the protecting unit 110 and detects the current of the protecting unit 110 as the temperature or the current increases due to abnormal overheating or overcurrent. .

The current suppressing portion 120 may be formed of a single body 120a and the body 120a may be formed of a PPTC material or a PTC material. That is, the current suppressing unit 120 may be a PPCT element or a PTC element.

For example, in the case of a PPTC device, the current suppressing portion 120 may include a polymer in which a conductive filler is dispersed. That is, the body 120a of the current suppressing part 120 may be made of a polymer. Here, the conductive filler may be made of a carbon black material.

The open mode protection element 100 is configured such that the protective portion 110 and the current suppression portion 120 formed of a single body are connected to the connection portion 103 between the first external electrode 101 and the second external electrode 102 So that it is not necessary to provide a separate internal electrode.

More specifically, one side of the protection unit 110 is connected to the first external electrode 101, and the current suppression unit 120 connected to the second external electrode 102 has a low resistance at room temperature, The second external electrode 102 can function as the other electrode of the protection unit 110 through the suppression unit 120. [ That is, the first external electrode 101 and the second external electrode 102 can function as the electrodes of the varistor in the protection unit 110.

Accordingly, since it is not necessary to provide the internal electrode, the structure is very simple, the production process can be simplified, the production efficiency can be improved, and furthermore, the open mode protection device 100 can be produced at low cost.

Here, each of the protection unit 110 and the current suppression unit 120 may be connected to any one of the first external electrode 101 and the second external electrode 102. For example, the protection unit 110 may be connected to the first external electrode 101, and the current suppression unit 120 may be connected to the second external electrode 102. As another example, the protection unit 110 may be connected to the second external electrode 102, and the current suppression unit 120 may be connected to the first external electrode 101.

As shown in FIG. 2, the open-mode protection device 100 may be represented by an equivalent circuit in which a protective portion 110 such as a varistor and a current suppressing portion 120 such as a PPTC device or a PTC device are connected in series.

That is, in the open mode protection device 100, each of the protection unit 110 and the current suppression unit 120 is connected to one of the first external electrode 101 and the second external electrode 102, and the connection unit 103 The protective portion 110 and the current suppressing portion 120 may be connected in series between the first external electrode 101 and the second external electrode 102. [

3, the current suppressing part 120 of the open mode protection device 100 according to the embodiment of the present invention has a low resistance value at an ordinary temperature of 80 to 120 DEG C ((a ) Area). At this time, the open mode protection element 100 functions as a protective element such as a varistor to protect the circuit by bypassing the EOS or the surge introduced into the static electricity or the load to the ground.

On the other hand, when the load made of LED is opened from the outside by ESD, EOS or surge, the current and voltage flowing to the open mode protection element 100 continuously increase and the protection unit 110 is overheated. That is, when the load is opened because the power source of the load is a constant current source, all the constant currents provided in the constant current source flow to the open mode protection element 100. At this time, a substantial load of the constant current source is the open mode protection element 100, and in this case, the constant current flows from the constant current source to the open mode protection element 100, and the voltage is increased to infinity.

For example, when the load is in the open state, the open-mode protection element 100, in particular, the protective portion (not shown) may be activated as the voltage across the open-mode protection element 100, 120 are overheated.

At this time, if the open mode protection element 100 is overheated at a temperature of 150 ° C to 200 ° C, the open mode protection element 100 can prevent the amount of current flowing in the open mode protection element 100 The voltage across both ends of the protection portion 110 can be reduced to reduce the temperature, so that heat generation can be suppressed (see the region (b)). Accordingly, self-breakage of the open mode protection element 100 due to overheating of the protection part 110 can be prevented.

1 and 2, the protection unit 110 is a varistor and the current suppression unit 120 is a PPTC device or a PTC device. However, the protection unit 110 and the current suppression unit 120 ) Can be made in various forms.

For example, the protection unit 110 may be any one of a suppressor, a gas discharge tube (GDT), and a diode, but is not limited thereto. The protection unit 110 may include an element capable of bypassing an overvoltage or an overcurrent have.

The current suppressing unit 120 may be a bimetal that completely cuts off the current path to the protection unit 110 according to the temperature of the protection unit 110 or may be a fuse that is cut off according to the current of the protection unit 110, And may include a device that can cut off the current path to the protection unit 110 or reduce the current when the protection unit 110 abnormally overheats or the overcurrent flows.

Hereinafter, various modifications of the open mode protection device 100 according to an embodiment of the present invention will be described with reference to FIGS.

4 and 5, the open mode protection device 100a may include the protection unit 110 'including the internal electrodes 112 and 114 and the connection electrode 103a.

That is, the protection unit 110 'may include a first internal electrode 112 and a second internal electrode 114 which are spaced apart from each other at regular intervals. To this end, the protective portion 110 'may be formed of a plurality of sheet layers 111.

The first sheet layer 111a is disposed at the lowermost portion of the plurality of sheet layers 111 and has a first inner electrode 112 connected to the first outer electrode 101 or the second outer electrode 102 May be provided. The second sheet layer 111b may be disposed on the first sheet layer 111a and the second internal electrode 114 may be provided on the second sheet layer 111b. The third sheet layer 111c is disposed on the upper side of the second sheet layer 111b and may be disposed on the uppermost portion of the plurality of sheet layers 111. [ At this time, each of the sheet layers 111a, 111b, and 111c is illustrated as being formed to have the same thickness in the drawing, but the present invention is not limited thereto.

Each of the plurality of sheet layers 111a, 111b, and 111c may be made of a varistor material. Accordingly, the protective portion 110 'can function as a varistor having the first internal electrode 112 and the second internal electrode 114.

At this time, a connection electrode 103a connected to the second internal electrode 114 may be provided on the junction surface of the protection unit 110 'and the current suppression unit 120. That is, the connection electrode 103a may be arranged so as to be in contact with a part of the current suppressing portion 120. [

The connection electrode 103a may function as one electrode of the current suppression unit 120 and may function as a connection unit for connecting the protection unit 110 'and the current suppression unit 120. [ That is, the current restricting part 120 may be formed by both the connection electrode 103a and the second external electrode 102 at both ends.

Accordingly, the protective portion 110 'can easily adjust the operating voltage using the distance between the first internal electrode 112 and the second internal electrode 114 and the characteristics of the electrode. In addition, since the protection unit 110 'forms a lower operating voltage than the protection unit 110 of FIG. 1, the protection function against overvoltage or overcurrent can be improved.

The open mode protection device 100a is the same as the open mode protection device 100 of FIG. 1 except for the internal electrode and the connection electrode of the protection unit, and thus a detailed description thereof will be omitted.

6 and 7, the open-mode protection device 100b includes a protection unit 110 disposed between the two current suppression units 120-1 and 120-2 and the current suppression units 120-1 and 120-2, &Quot;).

That is, the two current suppressing parts 120-1 and 210-2 are connected to either the first external electrode 101 or the second external electrode 102, and the protective part 110 ' 1, respectively.

Here, the first inner electrode 112 'and the second inner electrode 114' may be provided on both sides of the protection unit 110 '. In this case, the first inner electrode 112' and the second inner electrode 114 ' (114 ') may be disposed in contact with a part of the current suppressing portion (120).

The first internal electrode 112 'and the second internal electrode 114' may function as one electrode of each of the current suppressing portions 120-1 and 120-2. That is, the current restricting part 120-1 includes the first external electrode 101 and the first internal electrode 112 'as both ends electrodes, the current restricting part 120-2 as the second internal electrode 114' And the second external electrode 102 may constitute both end electrodes.

At this time, the protective portion 110 '' and the current suppressing portions 120-1 and 120-2 may be formed of a single body 110a or 120a.

As described above, since the protection portion 110 " is disposed between the current suppressing portions 120-1 and 120-2, the current blocking portions 120-1 and 120-2 prevent the first external electrode 101 and the second external electrode & The influence of the first external electrode 101 and the second external electrode 102 can be eliminated and the thickness of the body 110a of the protective portion 110 " can be reduced .

Thereby, the open mode protection element 100b can have a lower operating voltage of the protecting portion 110 ", thereby further improving the protection function against overvoltage or overcurrent.

8 and 9, the open mode protection element 100c may be formed of a plurality of sheet layers 111 '. That is, the protective portion 110 '' and the current suppressing portion 120 'of the open mode protection element 100c may be vertically connected.

The first sheet layer 111a may have a first inner electrode 112 'connected to the first outer electrode 101 or the second outer electrode 102 on the upper surface thereof. 120a may be disposed on the lower side of the first sheet layer 111a and the common electrode 114 " may be provided on the upper surface thereof. The third sheet layer 111c is disposed on the upper side of the first sheet layer 111a and may be disposed on the uppermost portion of the plurality of sheet layers 111 '. The fourth sheet layer 111d is disposed on the lower side of the second sheet layer 120a and has a second inner electrode 122 connected to the first outer electrode 101 or the second outer electrode 102 on the upper surface thereof . At this time, each of the sheet layers 111a, 111b, 111c, and 111d is formed to have the same thickness in the drawing, but the present invention is not limited thereto.

The plurality of sheet layers 111 'may be made of different materials.

For example, the first sheet layer 111a disposed between the first internal electrode 112 '' and the common electrode 114 '' is made of a varistor material, and the common electrode 114 '' and the second internal electrode 122 ' The third sheet layer 111c and the fourth sheet layer 111d may be formed of a PPTC material or a PTC material in the same manner as the first sheet layer 111a It may be made of a varistor material or a ceramic material.

At this time, since the resistance of the second sheet layer 120a made of the PPTC material or the PTC material is low at room temperature, the first external electrode 101 and the second external electrode 102 must be electrically disconnected. For this, the second sheet layer 120a may be provided with insulating members 124 on both sides connected to the first external electrode 101 and the second external electrode 102.

The protective portion 110 '' 'may include a first inner electrode 112' ', a common electrode 114' 'and a first sheet layer 111a. May include a common electrode 114 " that is spaced apart from the electrode 112 " and the first internal electrode 112 "

The current suppressing portion 120 'may include a common electrode 114 ", a second internal electrode 122 and a second sheet layer 120a. The current suppressing portion 120' And a second internal electrode 122 disposed opposite to the common electrode 114 " at a distance from the common electrode 114 ".

As described above, the common electrode 114 " functions as one electrode of each of the protective portion 110 " and the current restricting portion 120 ', through which the protective portion 110 " May be connected in series between the first external electrode 101 and the second external electrode 102.

Here, the protective portion 110 " 'is illustrated as being stacked on top of the current suppressing portion 120', but the present invention is not limited thereto, and the current blocking portion 120 ' .

The open mode protection devices 100 and 100a to 100c according to the embodiment of the present invention can be used in an electronic device having a load made up of a constant current source and an LED.

10, the electronic device 1 may include a constant current source 10, an LED load 12, a ground terminal, and an open mode protection element 100.

Here, the electronic device 1 is an apparatus having an LED as a load, and may be any one of a backlight (BLU) of a display device such as a TV, a lamp of an automobile, and smart lighting using dimming.

The constant current source 10 can supply a current of a predetermined magnitude to the LED load 12. The constant current source 10 may be any one of a constant current power source and a constant current driver. That is, the constant current source 10 is not limited to a particular type, and may be a source for supplying current in a constant current mode, for example, a power source for supplying power to the electronic device 1 or an LED load 12 And may be a driving unit for driving.

The LED load 12 may be composed of a plurality of LEDs. Here, the LED load 12 may be a plurality of LEDs connected in series, but is not limited thereto. For example, the LED load 12 may include a plurality of LEDs connected in series, a plurality of LEDs connected in series may be connected in parallel, a plurality of LEDs may be connected in parallel, and a plurality of LEDs connected in parallel may be connected in series .

The LED load 12 is supplied with a current of a predetermined magnitude from the constant current source 10, so that the LED may be turned on to have a constant voltage value. For example, when the constant current source 10 supplies a current of 400 mA and the LED load 12 is composed of ten LEDs, a voltage of approximately 25 to 30 V can be outputted to both ends of the load.

Here, one side of the constant current source 10 and the LED load 12 is connected to the ground terminal. That is, the cathode side of the constant current source 10 and the load 12 can be connected to the ground terminal. These grounding terminals can be connected to a common ground formed on the circuit board of the electronic device 1. [

The open-mode protection element 100 may be connected in parallel to the constant current source 10 and the LED load 12, respectively. That is, one side of the open mode protection element 100 is connected to one side of the constant current source 10 and the LED load 12, and the other side thereof can be connected to the other side of the constant current source 10 and the LED load 12 . At this time, one side of the open mode protection element 100 may be connected to the ground terminal.

As described above, when the ESD, EOS, or surge flows from the outside into the LED load 12 while the LED load 12 is in a normal operating state, 100 or the ESD, EOS or surge current (i _ESD ) flows and consequently bypasses the ground terminal, the LED load 12 can be protected from ESD, EOS or surge.

That is, since the resistance of the current suppressing portion 120 such as the PPTC element or the PTC element is very small, the open mode protection element 100 is substantially protected by ESD protection element 110 such as ESD, EOS, .

On the other hand, if the protection unit 110 does not have sufficient protection function against ESD, EOS or surge which is externally introduced, a part of the LED load 12 is damaged by ESD, EOS or surge, State is often generated.

At this time, as shown in FIG. 12, the current i _open of the constant current source 10 flows to the open mode protection element 100.

Accordingly, since the constant current source 10 continuously supplies a constant current, the current flowing in the open mode protection device 100 increases, and the voltage also increases greatly. As a result, the protective portion 110 of the open mode protection element 100 gradually increases in temperature due to overcurrent and overvoltage.

At this time, when the temperature of the protection unit 110 rises above a predetermined temperature, the resistance value of the current restriction unit 120 increases greatly, thereby reducing the current flowing through the protection unit 110, The rise can be suppressed.

Thus, by suppressing abnormal overheating of the open mode protection element 100, it is possible not only to prevent damage to the circuit components adjacent to the open mode protection element 100, but also to protect the adjacent elements from flammable materials, It is possible to prevent the fire due to the ignition of the protection device in advance when the white sheet is disposed on the front surface of the LED in order to improve the efficiency of light emitted from the protection device.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Electronic device 10: Constant current source
12: LED load 100, 100a to 100c: open mode protection element
101: first external electrode 102: second external electrode
103: connecting portions 111a, 111b, 111c, 111d, 120a:
110: Protection unit 120: Current suppression unit

Claims (14)

An open-mode protection element connected in parallel to a load made up of a constant current source and an LED,
A first external electrode connected to one side of the constant current source and the load;
A second external electrode connected to the other side of the constant current source and the load and the ground;
A protective unit for bypassing an overvoltage or an overcurrent flowing into the first external electrode to the ground through the second external electrode; And
The temperature of the protection unit is gradually increased by increasing the voltage of the protection unit by the current supplied from the constant current source in the open state of the load made of the LED, And a current suppressing unit for reducing a current of the protection unit,
Wherein at least a part of the body of the current suppressing portion is in face-to-face contact with the body of the protecting portion facing each other. The method according to claim 1,
Wherein the body of the protector is made of a varistor material,
Wherein the body of the current suppressing portion is made of a PPTC material or a PTC material. 3. The method of claim 2,
Wherein each of the protection unit and the current suppression unit is connected to one of the first external electrode and the second external electrode. The method of claim 3,
Wherein each of the protection unit and the current suppression unit is a single body. The method of claim 3,
Wherein the protector includes a plurality of sheet layers, first and second internal electrodes spaced apart from each other at a predetermined distance, and a connection electrode connected to the second internal electrode,
Wherein the current suppressing portion comprises a single body,
Wherein the connection electrode is disposed in contact with a part of the current suppressing portion. 6. The method of claim 5,
Wherein the first internal electrode is connected to one of the first external electrode and the second external electrode. 3. The method of claim 2,
Wherein the current suppressing portion is formed of two and connected to each of the first external electrode and the second external electrode,
And the protective portion is disposed between the two current suppressing portions. 8. The method of claim 7,
The protection unit includes a first internal electrode and a second internal electrode on both sides,
Wherein the first internal electrode and the second internal electrode are arranged so as to be in contact with a part of the current suppressing portion. The method of claim 3,
Wherein the body of the open mode protection element comprises a plurality of sheet layers,
Wherein the protection unit includes a first internal electrode and a common electrode disposed opposite to the first internal electrode by a predetermined distance,
Wherein the current suppressing portion includes a second internal electrode disposed opposite to the common electrode with a predetermined distance therebetween,
And an insulating member for blocking electrical connection between the first external electrode and the second external electrode on both sides of the sheet layer constituting the current suppressing portion. 10. The method of claim 9,
Wherein each of the first internal electrode and the second internal electrode is connected to one of the first external electrode and the second external electrode. The method according to claim 1,
Wherein the current suppressor is any one of a bimetal, a fuse, a polymeric positive temperature coefficient (PPTC) device, and a positive temperature coefficient (PTC) device. The method according to claim 1,
Wherein the protection unit is one of a varistor, a suppressor, a gas discharge tube (GDT), and a diode. Constant current source;
A load consisting of an LED driven by the constant current source;
A ground terminal to which the constant current source and one side of the load are connected; And
12. The electronic device according to any one of claims 1 to 11, wherein the open-mode protection element is connected in parallel to the constant current source and the load, and one side is connected to the ground terminal. 14. The method of claim 13,
Wherein the constant current source is any one of a constant current driving unit and a constant current type power source.

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