KR20170047726A - Circuit protection device and mobile electronic device with the same - Google Patents

Circuit protection device and mobile electronic device with the same Download PDF

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Publication number
KR20170047726A
KR20170047726A KR1020150148158A KR20150148158A KR20170047726A KR 20170047726 A KR20170047726 A KR 20170047726A KR 1020150148158 A KR1020150148158 A KR 1020150148158A KR 20150148158 A KR20150148158 A KR 20150148158A KR 20170047726 A KR20170047726 A KR 20170047726A
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KR
South Korea
Prior art keywords
electric shock
shock protection
electronic device
static electricity
conductor
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KR1020150148158A
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Korean (ko)
Inventor
김동기
Original Assignee
주식회사 아모텍
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Priority to KR1020150148158A priority Critical patent/KR20170047726A/en
Publication of KR20170047726A publication Critical patent/KR20170047726A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/0009—Casings with provisions to reduce EMI leakage through the joining parts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0067—Devices for protecting against damage from electrostatic discharge

Abstract

An electric shock protection device and a portable electronic device having the same are provided. An electric shock protection device according to an exemplary embodiment of the present invention is an electric shock protection device disposed between a body contactable conductor of an electronic device and a built-in circuit portion, wherein a plurality of sheet layers are laminated and formed, A body having a dielectric constant of 20 or more to pass through; At least a pair of internal electrodes disposed at predetermined intervals in the inside of the body; And a gap formed between the internal electrodes, wherein the static electricity passes through the static electricity without being broken when the static electricity flows from the conductor, and the leakage current of the external power source flowing from the ground of the circuit part is blocked do. Where Vbr is the breakdown voltage of the electric shock protection element and Vin is the rated voltage of the external power supply of the electronic device. According to this, it is possible to protect the user from the leakage current caused by the power source by only one element, protect the internal circuit from the external static electricity, and prevent the data loss in the communication frequency region.

Description

[0001] The present invention relates to an electric shock protection device and a portable electronic device having the same,

The present invention relates to an electric shock protection device, and more particularly, to an electric shock protection device that protects a user from leakage current caused by a power source by using only one device, protects an internal circuit from external static electricity, And a portable electronic device having the same.

Recently, the adoption of a metal-made housing has been increasing in order to improve aesthetics and robustness of portable electronic devices.

However, since the metal housing is excellent in electrical conductivity due to the nature of the material, an electrical path can be formed between the housing and the built-in circuit depending on the specific device or depending on the location. Particularly, since the metal housing and the circuit part form a loop, when a static electricity having a high voltage instantaneously flows through a conductor such as a metal housing having a large exposed surface area, the circuit part such as an IC can be damaged, Measures are required.

On the other hand, such a portable electronic device typically uses a charger to charge the battery. Such a charger rectifies an external AC power source to a DC power source and then through a transformer to a low DC power source suitable for a portable electronic device. Here, in order to enhance the electrical insulation of the transformer, a Y-CAP composed of a capacitor is provided at both ends of the transformer.

However, when the Y-CAP does not have the normal characteristics, such as a non-genuine charger, the DC power may not be sufficiently blocked by the Y-CAP, and furthermore, a leakage current may be generated by the AC power source. Can propagate along the ground of the circuit.

Such a leakage current can be transmitted to a conductor that can be contacted with a human body as in an external case of a portable electronic device. As a result, the user can give an unpleasant feeling of crushing and, in severe cases, There is a fear of wearing. Accordingly, a portable electronic device such as a cellular phone employing a metal case is required to protect the user from such a leakage current.

On the other hand, a conventional device having a function of protecting an internal circuit or a function of cutting off a leakage current in the above-mentioned high-voltage static electricity is a device in which a capacitance is increased to prevent signal delay or distortion on a data line transmitting a high- (For example, a device having a low electrostatic capacitance of less than 1 pF) has been used. However, a normal device having a significantly low capacitance remarkably increases data loss in a communication frequency band of an electronic device having the device, .

Accordingly, an electrostatic discharge preventing function prevents static electricity having an instantaneous high voltage from flowing from the outside through the conductor to destroy the internal circuit, and a leakage current preventing flow of the leakage current through the conductor, It is urgently required to develop a device capable of preventing data loss in a communication frequency band used by an electronic device in which the device is provided.

KR 0573364 B

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for protecting an internal circuit and / or a user from leakage current caused by static electricity or external power supply, An object of the present invention is to provide an electric shock protection device capable of preventing data loss in a communication frequency band and a portable electronic device having the same.

In order to solve the above-described problems, the present invention provides an electric shock protection device disposed between a human contactable conductor of an electronic device and an internal circuit portion. Wherein the electric shock protection housing is formed by stacking a plurality of sheet layers and has a dielectric constant of not less than 20 so as to pass a communication signal flowing from the electric conductor without attenuation; At least a pair of internal electrodes disposed at predetermined intervals in the inside of the body; And a gap formed between the inner electrode and the inner electrode to allow the static electricity to pass therethrough without interrupting insulation when the static electricity flows from the conductor and to prevent a leakage current of the external power source flowing from the ground of the circuit unit :

Vbr > Vin where Vbr is the breakdown voltage of the electric shock protection element, and Vin is the rated voltage of the external power supply of the electronic device.

At this time, the dielectric constant of the body may be at least 38.

In addition, the rated voltage may be a national standard rated voltage.

Further, the pair of internal electrodes may be arranged on the same plane.

The gap may be equal to or greater than the gap between the pair of inner electrodes, and the height may be equal to or greater than the thickness of the pair of inner electrodes.

In addition, the gap may be arranged in a vertical or horizontal direction about the internal electrode.

Also, the gap may be provided between the pair of inner electrodes.

The gap may include a layer of a discharge material applied to the inner wall at a predetermined thickness along the height direction.

Also, the discharge material layer may be formed of a non-conductive material or a semiconductor material including metal particles.

In addition, the layer of discharge material may include a first portion that is applied along the inner wall of the cavity, a second portion that extends outwardly from the top of the first portion, and a third portion that extends outwardly from the bottom of the first portion The second portion may be in contact with one of the pair of inner electrodes, and the third portion may be in contact with the other of the pair of inner electrodes.

In addition, the conductor may perform a communication function between the electronic device and an external device.

Also, the internal electrode may include at least one of Ag, Au, Pt, Pd, Ni, and Cu.

The internal electrodes may be polygonal, circular, elliptical, spiral, or a combination thereof.

The interval between the internal electrodes may be 10 to 100 mu m.

The thickness of the internal electrode may be 2 to 10 mu m.

In addition, the volume of the gap may be 1-15% of the total volume of the electric shock protection device.

In addition, the communication signal may have a wireless communication frequency band.

In addition, the discharge start voltage due to the static electricity of the internal electrode may be 1 to 15 kV.

On the other hand, the present invention provides a human body contactable conductor; Circuitry; And an electric shock protection element disposed between the conductor and the circuit portion. Here, the electric shock protection housing is formed by stacking a plurality of sheet layers and has a dielectric constant of not less than 20 so as to pass a communication signal flowing from the electric conductor without attenuation; At least a pair of internal electrodes disposed at predetermined intervals in the inside of the body; And a gap formed between the inner electrode and the inner electrode to allow the static electricity to pass therethrough without interrupting insulation when the static electricity flows from the conductor and to prevent a leakage current of the external power source flowing from the ground of the circuit unit :

Vbr> Vin

Where Vbr is the breakdown voltage of the electric shock protection element and Vin is the rated voltage of the external power supply of the electronic device.

In addition, the conductor may include at least one of an antenna, a metal case, and conductive ornaments for communication between the electronic device and an external device.

In addition, the metal case may be provided to partially surround or entirely surround the side of the housing of the electronic device.

In addition, the metal case may be provided to surround the camera, which is exposed to the outside on the front surface or the rear surface of the housing of the electronic device.

In addition, the dielectric constant of the body may satisfy 38 or more.

Hereinafter, terms used in the present invention will be described.

The term dielectric constant, which is used in the present invention, means a dielectric constant that represents the ratio of the dielectric constant of a material to the dielectric constant in a vacuum state.

According to an embodiment of the present invention, there is provided an electric shock protection device and a portable electronic device including the electric shock protection device. In the portable electronic device in which a conductor such as a metal case is exposed to the outside, There is an advantage that the user and the internal circuit can be protected from the leakage current and the static electricity due to the leakage current. In addition, the data loss at the communication frequency used by the portable electronic device equipped with the electric shock protection device can be remarkably reduced.

1 is an overall perspective view of an electric shock protection device according to an embodiment of the present invention;
Fig. 2 is an exploded perspective view showing the lamination relationship of the plurality of sheet layers shown in Fig. 1,
Fig. 3 is a longitudinal sectional view of Fig. 1,
4A to 4E are conceptual diagrams showing an application example of an electric shock protection device according to an embodiment of the present invention,
5A to 5C are schematic equivalent circuit diagrams for explaining operation of (a) leakage current, (b) static electricity (ESD), and (c) communication signal of the electric shock protection device according to the embodiment of the present invention,
6A to 6E are views showing various forms of internal electrodes in an electric shock protection device according to an embodiment of the present invention,
7 is an overall perspective view showing another example of an electric shock protection device according to an embodiment of the present invention,
Fig. 8 is a longitudinal sectional view of Fig. 7,
9A and 9B are views showing various forms of voids in another example of an electric shock protection device according to an embodiment of the present invention,
10A to 10D are views showing various forms of internal electrodes in another example of the electric shock protection device according to the embodiment of the present invention,
11 is a longitudinal sectional view showing still another example of the electric shock protection device according to the embodiment of the present invention, and Fig.
12A to 12E are views showing various forms of internal electrodes in another example of an electric shock protection device according to an embodiment of the present invention.

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.

The electric shock protection device 100 according to an embodiment of the present invention includes a body 110, internal electrodes 111a and 112a and a gap forming member 124 as shown in Figs. 1 to 3, For example, it can be a prepressor.

The electric shock protection element 100 is disposed between the human-contactable conductor of the electronic device and the internal circuit part, passes the static electricity without being broken down in insulation when the static electricity flows from the electric conductor, and the leakage current The following conditions can be satisfied for this purpose:

Vbr> Vin

Here, Vbr is a breakdown voltage of the electric shock protection element,

Vin is the rated voltage of the external power supply of the electronic device.

At this time, the rated voltage may be a standard rated voltage for each country, for example, 240V, 110V, 220V, 120V, 110V, and 100V.

At this time, the body 110 has at least one pair of sheet layers 111, 112 and 120 sequentially stacked, and the internal electrodes 111a and 112a provided on one surface thereof are arranged to be opposed to each other. .

The body 110 satisfies a dielectric constant of 20 or more to prevent data loss in the communication frequency range. Specifically, an electric shock protection device realized through a substantially low-permittivity element can be easily implemented to realize a low-capacitance electric shock protection device. A low-capacitance electric shock protection device is a device in which a low- There is a problem of accelerating data loss in a communication frequency band used by an electronic device having the electronic device. Therefore, an electronic device having frequent data communication with an external device is not suitable for a low electrostatic capacity can do. In order to solve the problem of data loss due to such an electric shock protection device, it is possible to assume that the electrostatic capacity of the electric shock protection device is increased to a certain value or more. For this purpose, a method of increasing the surface area of the body of the electric shock protection device, A method of reducing the distance between the internal electrodes provided in the internal electrode and / or a method of increasing the overlapping area between the internal electrodes may be considered. However, it is not desirable to increase the overlap area between the internal electrodes or to increase the surface area of the body in consideration of the tendency to implement electronic devices such as portable devices which are small and light in recent years. In addition, reducing the distance between the internal electrodes provided inside the body may weaken resistance to static electricity and fail to achieve a level for which leakage current interruption is desired. Therefore, in order to satisfy the basic physical property of protecting the user from electric shock due to the circuit protection from the static electricity and the leakage current that the electric shock protection device must express, and to prevent communication data loss, the distance between the internal electrodes, And porosity should be considered together with the dielectric constant of the body. If the dielectric constant of the body satisfies 20 or more, preferably 38 or more, the advantages . If the dielectric constant of the body is less than 20, there is a problem that the data communication efficiency and the communication distance of the electronic device can be remarkably reduced even when there is no problem in the electrostatic shielding of the electric shock protection element and the physical property of the leakage current shielding.

The elementary body 110 may be used without limitation in the case of an insulator satisfying a dielectric constant of 20 or more, and a known insulator may be used. As a non-limiting example, the insulator may be made of a ceramic material and a magnetic material including low-temperature sintered ceramics (LTCC) and high-temperature sintered ceramics (HTCC). In this case, the ceramic material may be an oxide-based ceramic compound or a non-oxide-based ceramic compound, wherein the oxide-based ceramic compound is BeO, MgO, LaCrO 3, PbTiO 3, (Ba, Pb) TiO 3, ZrO 2, Er 2 O 3, Dy 2 O 3, Ho 2 O 3, V 2 O 5, CoO, MoO 3, SnO 2, BaTiO 3, Nd 2 O 3, SiO 2, TiO 2, ZnO, SrTiO 3, LiNbO 3, LiTaO 3, Mn-based oxides, Ni-based oxides, Mn-based oxides, Al 2 O 3, and solid solutions thereof. The non-oxide ceramic compound may include at least one selected from SiC, CdTe, TiC, TiN, B 4 C, Si 3 N 4 , BN, TiB 2 and AlN. In addition, the magnetic material may be a ferrite compound, and may be used without limitation in the case of conventional soft ferrite. One or more of Ni-Zn ferrite and Mn-Zn ferrite may be included.

The internal electrodes 111a and 112a are spaced apart from each other within the body 110 and may be formed of at least one pair. The first internal electrode 111a and the second internal electrode 112a may be electrically connected to external electrodes 131 and 132 provided at both ends of the body 110, respectively.

The internal electrodes 111a and 112a may include at least one of Ag, Au, Pt, Pd, Ni, and Cu. The external electrodes 131 and 132 may include at least one of Ag, Ni, can do.

At this time, the intervals between the internal electrodes 111a and 112a, the areas facing each other, or the lengths overlapping with each other may be configured to satisfy a breakdown voltage (or a trigger voltage) Vbr of the supercler 200, The interval between the electrodes 111a and 112a may be 10 to 100 占 퐉. For example, the interval between the internal electrodes 111a and 112a may be 25 占 퐉.

Here, if the interval between the first internal electrode 111a and the second internal electrode 112a is less than 10 mu m, resistance to static electricity may be weakened. If the interval between the first internal electrode 111a and the second internal electrode 112a exceeds 100 占 퐉, the discharge starting voltage (operating voltage) increases and a smooth discharge due to the static electricity is not generated, The function may be lost.

At this time, the thicknesses of the first internal electrode 111a and the second internal electrode 112a may be 2-10 탆. If the thicknesses of the first internal electrode 111a and the second internal electrode 112a are less than 2 占 퐉, they can not serve as internal electrodes. If the thickness is more than 10 占 퐉, the distance between the internal electrodes is limited , The volume of the electric shock protection device 100 increases, which may adversely affect miniaturization.

With this configuration, the discharge start voltage (operation voltage) due to the static electricity of the internal electrodes 111a and 112a can be 1 to 15 kV. Here, if the discharge starting voltage of the electric shock protection element 100 is 1 kV or less, it is difficult to secure the resistance against static electricity, and if it is 15 kV or more, it may be damaged by static electricity.

On the other hand, between the pair of electrodes 111a and 112a corresponding to each other, a protection sheet layer 120 for protecting static electricity and protecting circuit protection elements and peripheral circuits from overvoltage is disposed.

The protective sheet layer 120 is provided with at least one air gap forming member 124 formed between the pair of internal electrodes 111a and 112a. To this end, the protection sheet layer 120 may be formed with a through hole 126 at a position where the gap forming member 124 is provided.

More specifically, the body 110 includes a first sheet layer 111 having a first internal electrode 111a, a second sheet layer 111 having a protective sheet layer 120 and a second internal electrode 112a, (112) are successively laminated on one another. At this time, the first sheet layer 111, the protective sheet layer 120, and the second sheet layer 112 are sequentially stacked so that the first internal electrode 111a and the second internal electrode 112a can face each other, . The first internal electrode 111a and the second internal electrode 112a are disposed to face each other and are spaced apart from each other by the protection sheet layer 120. The first internal electrode 111a, And the second internal electrode 112a may be disposed so that one side thereof is in contact with the gap forming member 124, respectively.

Each of the sheets 111, 112, and 120 may be manufactured by press-molding a sheet-forming composition into a sheet form. The sheet-forming composition may include an insulator powder and a binder. The insulator powder may include at least one kind of the above-mentioned insulator, and the average particle diameter of the powder may be 0.1 to 5 mu m, for example, 0.1 to 1 mu m. If the average particle diameter of the insulator powder is less than 0.1 占 퐉, there may be a problem of greatly increasing the manufacturing cost. If the insulator powder is more than 1 占 퐉, if two or more types of insulator powder are mixed for controlling the sintering temperature, And there may be a problem that the sintered body does not have a proper volume shrinkage ratio after sintering.

 Accordingly, the insulator powder may be pulverized through mechanical milling or the like so as to have a desired average particle size before mixing with the binder, and then dried. The drying process may be performed at a temperature of 50 to 200 ° C for 30 minutes to 10 hours, but is not limited thereto. After the drying process, the final insulator powder may be prepared by further pulverizing the powder so as to have a desired average particle size.

The sheet-forming composition may be prepared by mixing the binder with the insulator powder prepared subsequently. The binder can be used without limitation in the case of a binder used for producing a known green sheet, and as a non-limiting example thereof, a polyvinyl butyral resin, a polyvinylacetate resin, and a polyacrylic resin And the like. The binder may be mixed in an amount of 1 to 30 parts by weight based on the total weight of the insulator powder and the binder. If the binder is contained in an amount of less than 1 part by weight, the binder strength of the insulator powder is lowered, and the mechanical strength of the body may be significantly lowered even after sintering. In addition, if the binder is contained in an amount exceeding 30 parts by weight, the air permeability of the sheet itself after being manufactured into a sheet form is not good, and an internal air trap may occur when a thick film staking method is applied. And the adhesion may be increased even with a small amount of moisture, and workability may be deteriorated, and volume shrinkage during drying of the sheet is remarkable, and there is a possibility that the sheet bends or the quality of the surface is deteriorated.

The sheet-forming composition may be formed into a sheet shape through pressure molding. The press molding may be carried out using a general press molding method used in the art. For example, the granules are put into a molding mold having a diameter of 7.0 to 10.0 mm, and a pressure of 800 to 1,200 kg / cm < 3 & A press molded product to be manufactured can be produced.

Internal electrodes 111a and 112a may be formed on one surface of the sheet formed by press molding such as a first sheet layer 111 and a second sheet layer 112. The internal electrodes 111a and 112a may be formed, May be formed by known methods. The present invention is not limited to this method. For example, the internal electrode forming material may be applied, deposited, or printed. Also, in the case of the protective sheet layer 120, the piercing hole 126 may be formed, and the pore forming member 124 may be further formed after the piercing. Meanwhile, the through hole 126 may be formed with a dissolving member (not shown) at a position of a sheet to be formed with a through hole, and then the dissolving member may be removed in a sintering process to be described later to form the through hole 126.

As shown in FIG. 3, at least one through hole 126 is formed in the protective sheet layer 120 disposed between the first sheet layer 111 and the second sheet layer 112. The through holes 126 are formed so that the first internal electrode 111a and the second internal electrode 112a, which are disposed on the upper and lower sides of the protective sheet layer 120, The sheets 111, 112, and 120 may be stacked such that the through holes 126 formed therein and / or formed are located in regions where the first internal electrode 111a and the second internal electrode 112a overlap with each other.

When the gap forming member 124 is provided in the through hole 126, the gap forming member 124 is disposed between the internal electrodes 111a and 112a, and the gap between the internal electrodes 111a and 112a, (124a, 124b, 124c).

Alternatively, if the gap forming member 124 is not provided separately, the layer of the discharge material may be applied to the inner wall of the through hole 126 with a predetermined thickness along the height direction.

Here, the gap forming member 124 or the layer of the discharge material coated thereon is provided such that its upper end is in contact with the second inner electrode 112a and its lower end is in contact with the first inner electrode 111a.

An air gap 126 may be formed between the pair of inner electrodes 111a and 112a by the gap forming member 124. [ The static electricity introduced from the outside by the gap 126 can be discharged between the internal electrodes 111a and 112a. At this time, the electrical resistance between the internal electrodes 111a and 112a is lowered, and the voltage difference between both ends of the electric shock protection device 100 can be reduced to a certain value or less. Therefore, the electric shock protection element 100 can pass the static electricity without being broken.

Here, the discharge material constituting the discharge material layers 124a, 124b and 124c must have a low dielectric constant, no conductivity, and no short circuit when an overvoltage is applied.

To this end, the discharge material may be made of a nonconductive material including at least one kind of metal particles, and may be made of a semiconductor material containing SiC or a silicon-based component. In addition, the discharge material may be formed by mixing at least one material selected from SiC, carbon, graphite, and ZnO and at least one material selected from Ag, Pd, Pt, Au, Cu, Ni, It is possible.

For example, when the first internal electrode 111a and the second internal electrode 112a include an Ag component, the discharge material may include a SiC-ZnO-based component. The SiC (Silicon Carbide) component has excellent thermal stability, excellent stability in an oxidizing atmosphere, constant conductivity and heat conductivity, and low dielectric constant.

The ZnO component has excellent nonlinear resistance characteristics and discharge characteristics.

SiC and ZnO are both conductive when used separately, but when they are mixed and fired, ZnO is bonded to the surface of the SiC particles to form an insulating layer.

In such an insulating layer, SiC completely reacts to form a SiC-ZnO reaction layer on the surface of the SiC particles. Accordingly, the insulation layer blocks the Ag path to provide a further higher insulation property to the discharge material and improves resistance to static electricity, thereby solving the DC short phenomenon when the electric shock protection device 100 is mounted on the electronic part .

Here, it is described that the discharge material includes a SiC-ZnO-based material. However, the discharge material is not limited to the SiC-ZnO based material, and the discharge material may include a component constituting the first internal electrode 111a and the second internal electrode 112a A non-conductive material including a semiconductor material or metal particles may be used

At this time, the discharge material layers 124a, 124b, and 124c applied to the inner wall of the gap forming member 124 include a first portion 124a coated along the inner wall of the gap forming member 124, A second portion 124b extending from the top of the first portion 124a in contact with and facing the first internal electrode 111a along the top surface of the protective sheet layer 120 and a second portion 124b extending from the bottom of the first portion 124a, And a third portion 124c extending in contact with and facing the second internal electrode 112a along the lower surface of the sheet layer 120. [

As a result, the discharge material layers 124a, 124b and 124c are formed not only from the inner wall of the gap forming member 124 but also from the upper and lower ends of the gap forming member 124, The first internal electrode 111a and the second internal electrode 112a are extended to extend the contact area with the first internal electrode 111a and the second internal electrode 112a.

According to this configuration, even if a part of the discharge material layers 124a, 124b and 124c is damaged as a part of the constituents of the discharge material layers 124a, 124b and 124c is vaporized by the electrostatic spark, 124a, 124b, and 124c can perform their functions, resistance to static electricity can be improved.

Meanwhile, the protective sheet layer 120 may be provided with a plurality of void forming members 124. As described above, when the number of the gap forming members 124 is increased, the discharge path of the static electricity is increased, so that resistance to static electricity can be improved.

The protective sheet layer 120 disposed between the first sheet layer 111 and the second sheet layer 112 is formed to have the same area as the first sheet layer 111 and the second sheet layer 112 The first internal electrode 111a and the second internal electrode 112a may be overlapped with each other and may have a smaller area than the first and second sheet layers 111 and 112 .

The first sheet layer 111, the protective sheet layer 120 and the second sheet layer 112 which are sequentially stacked as described above can be realized as the body 110 through the sintering process. The sintering process may be performed through electric sintering using silver (Ag) electrodes, and the sintering process may be performed at 850 to 950 ° C, preferably 880 to 940 ° C. If the temperature is lower than 850, sintering may not occur smoothly. If the temperature is higher than 950, the internal electrode material of the sintering unit may be changed to a silver-palladium (Ag-Pd) alloy electrode at the silver (Ag) The sintering process may be carried out at the above temperature. However, the sintering process may be performed in accordance with the kind of the insulator powder contained in the sheet, the kind of the binder, and the material of the internal electrode formed on one surface of the sheet. It is not.

Such an electric shock protection element 100 may be disposed between the conductor 12 and the circuit portion 14, such as an external metal case, in the portable electronic device 10, as shown in FIG. 4A.

Here, the portable electronic device 10 may be in the form of a portable electronic device that is portable and portable. For example, the portable electronic device may be a portable terminal such as a smart phone, a cellular phone, and the like, and may be a smart watch, a digital camera, a DMB, an electronic book, a netbook, a tablet PC, Such electronic devices may comprise any suitable electronic components including antenna structures for communication with external devices. In addition, it may be a device using local area network communication such as Wi-Fi and Bluetooth.

Such a portable electronic device 10 may be made of conductive materials such as metal (aluminum, stainless steel, etc.) or carbon-fiber composite materials or other fiber-based composites, glass, ceramics, plastic, . ≪ / RTI >

At this time, the housing of the portable electronic device 10 may include a conductor 12 made of metal and exposed to the outside. Here, the conductor 12 may include at least one of an antenna for communication between the electronic device and an external device, a metal case, and conductive ornaments. In this case, when the conductor 12 performs a function for communication, the electric shock protection device 100 according to an embodiment of the present invention includes the conductor 12 and the circuit part, preferably the communication function, May be disposed between the associated circuitry, thereby not degrading the sensitivity of the RF signal. If the electric shock absorber without regard to the dielectric constant of the body of the electric element is disposed between the conductor and the conductor performing the communication function, the sensitivity of the RF signal can be remarkably reduced.

Meanwhile, the metal case may be provided to partially surround or entirely surround the side portion of the housing of the portable electronic device 10. In addition, the metal case may be provided to surround the camera, which is exposed to the outside on the front surface or the rear surface of the housing of the electronic device.

At this time, the electric shock protection element 100 may be disposed between the human contactable conductor 12 of the portable electronic device 10 and the circuit portion 14 in order to protect the internal circuit from leakage current and static electricity. The anti-shock device 100 may be provided in various ways as appropriate according to the number and function of the metal case provided in the housing of the portable electronic device 10. For example, when a plurality of metal cases are provided, each of the metal cases 12a, 12b, 12c, and 12d may be embedded in the housing of the portable electronic device 10 such that the anti- .

The electric shock protection device 100 included in the portable electronic device 10 according to the embodiment of the present invention considers the function of the metal case of the conductor 12 and the function of the circuit portion 14 connected to the conductor 12 And may be implemented with a body 110 having mutually different dielectric constants.

Specifically, when each of the conductors 12a, 12b, 12c, and 12d has a three-piece structure, such as a metal case surrounding the side of the housing of the portable electronic device 10 as shown in FIG. 4A, The portable electronic device 10 can be protected from the leakage current and the static electricity by connecting the portable device 10 with the electric shock prevention device 100. For example, When the electric shock preventing device 100 is applied to the conductor 12d surrounding the camera, the electric shock preventing device 100 may be provided in such a form as to block the leakage current and protect the internal circuit from static electricity . However, if the conductor 12d does not function as an antenna, the anti-electrostatic device 100 may be provided with an anti-electrostatic device having a body dielectric constant of less than 20.

In addition, when the metal case 12b serves as a ground, the anti-shock device 100 may be connected to the metal case 12b to shield the leakage current and protect the internal circuit from static electricity .

In addition, as shown in FIG. 4B, the electric shock protection device 100 may be disposed between the metal case 12 'and the circuit board 14'. At this time, since the electric shock protection element 100 is for passing static electricity without damaging itself, the circuit board 14 'may have a separate protection element 16 for bypassing the static electricity to the ground. Here, the protection element 16 may be a suppressor or a varistor.

4C, the electric shock protection device 100 is disposed between the metal case 12 'and the FFM (front end module) 14a through a matching circuit (for example, R and L components) . Here, the metal case 12 'may be an antenna. At this time, the electric shock protection device 100 is for blocking static electricity from the metal case 12 'and leakage current flowing from the ground through the matching circuit, but it is also very important to pass the communication signal without attenuation . However, since a normal electric shock protection device is difficult to pass communication signals without attenuation, a separate element or device capable of raising the RF reception sensitivity is required. However, since the electric shock protection housing according to an embodiment of the present invention satisfies the dielectric constant of 20 or more, it is advantageous in that the RF signal reception sensitivity can be maintained by preventing the attenuation of the communication signal without any additional device or device.

4D, the electric shock protection device 100 may be disposed between the metal case 12 'having the antenna and the IC 14c implementing the communication function through the antenna, The electric shock protection device according to the present invention having a dielectric constant of 20 or more can simultaneously perform leakage current interruption, protection against static electricity, and prevention of attenuation of a communication signal. Here, the corresponding communication function may be NFC communication. At this time, since the electric shock protection element 100 is for passing the static electricity without damaging itself, it may be provided with a separate protection element 16 for bypassing the static electricity to the ground. Here, the protection element 16 may be a suppressor or a varistor.

4E, the electric shock protection element 100 may be disposed between the short pin 22 of the PIFA (Planar Inverted F Antenna) antenna 20 and the matching circuit. At this time, the electric shock protection element 100 is to pass the communication signal without attenuation, to pass the static electricity from the metal case 12 ', and to block the leakage current flowing from the ground through the matching circuit.

Such an electric shock protection device 100 may have different functions depending on the leakage current due to the external power source and the static electricity flowing from the conductor 12, as shown in Figs. 5A to 5C.

5A, when the leakage current of the external power source is introduced into the conductor 12 through the circuit board of the circuit unit 14, for example, the ground, the electric shock protection element 100 has its breakdown voltage (Vbr) is larger than the overvoltage due to the leakage current, it can be kept open. That is, since the breakdown voltage Vbr of the electric shock protection element 100 is larger than the rated voltage of the external power source of the portable electronic device, the human body contactable conductor 12, such as a metal case, It is possible to prevent the leakage current from being transmitted. As a result, the electric shock protection device 100 can protect the user from electric shock by interrupting the leakage current to the external power source which flows from the ground of the circuit part 14. [

5B, when the static electricity flows from the outside through the conductor 12, the electric shock protection element 100 functions as an electrostatic protection element such as a suppressor. That is, since the operation voltage (discharge start voltage) of the suppressor for electrostatic discharge is smaller than the instantaneous voltage of the static electricity, the electric shock protection element 100 can pass the static electricity by the instantaneous discharge. As a result, the electric shock protection element 100 can lower the electrical resistance when the static electricity flows from the conductor 12, so that the static electricity can pass without being electrically broken.

Here, the circuit unit 14 may have a separate protection element for bypassing the static electricity to the ground. As a result, the electric shock protection element 100 can pass the static electricity without being broken by the static electricity flowing from the electric conductor 12, thereby protecting the inner circuit of the following stage.

5C, when a communication signal is inputted through the conductor 12, the electric shock protection element 100 can function as a capacitor. As the permittivity of the body is 20 or more, The communication signal can be transmitted to the circuit portion while preventing the attenuation.

The first internal electrode 311a and the second internal electrode 312a constituting the internal electrode in the element body may be provided in various shapes and patterns in the electric shock protection element 100, 311a and the second internal electrode 312a may be provided in the same pattern or may have different patterns.

For example, as shown in Fig. 6A, the ends of the pair of second internal electrodes 112a are provided on both sides of the bar-shaped first internal electrode 111a so as to overlap with each other, One in the region where the through holes 126 to which the discharge material layer 124 is applied overlap.

As shown in FIG. 6B, the first internal electrode 111a and the second internal electrode 112a are provided in a substantially Y-shape so that the two internal electrodes are overlapped with each other. The through holes 126 to which the discharge material layer 124 is applied may be respectively disposed in the overlapping areas.

In addition, as shown in FIG. 6C, the first internal electrodes 111a are provided in two bar shapes having a predetermined length, and the second internal electrodes 112a are provided in two in a substantially Y shape, And the through holes 126 to which the discharge material layer 124 is applied on the inner wall may be respectively disposed at four portions overlapping with each other.

As shown in FIG. 6D, the first internal electrode 111a and the second internal electrode 112a are formed in a bar shape having a predetermined length, and a discharge material layer 124 is formed on an inner wall of the first internal electrode 111a and the second internal electrode 112a, The two through holes 126 may be spaced apart by a predetermined distance.

In addition, as shown in FIG. 6E, the first internal electrodes 111a are provided in a single bar shape having a predetermined length, and the second internal electrodes 112a are formed in two bar shapes having a predetermined length A through hole 126 in which two discharge material layers 124 are applied may be disposed in the overlapping region so as to be partially overlapped with both ends of the first internal electrode 111a

The first internal electrode 111a and the second internal electrode 112a may be formed in various shapes and patterns. When the first internal electrode 111a and the second internal electrode 112a are stacked, It should be noted that it is not possible to arrange them to overlap each other.

Hereinafter, various embodiments of the electric shock protection device according to the embodiment of the present invention will be described in detail with reference to FIGS. 7 to 12. FIG.

The space 220 may be formed between the internal electrodes 214a and 214b without using the separate space forming member in the electric shock protection device 200. [ At this time, the sidewall of the gap 220 may include a discharge material layer 224.

The electric shock protection device 200 may include a pair of internal electrodes 214a and 214b horizontally spaced apart from each other by a predetermined distance.

At this time, the internal electrodes disposed opposite to each other may be provided in various shapes and patterns such as polygonal, circular, elliptical, spiral, and combinations thereof. The internal electrodes facing each other may be provided in the same pattern and shape, or may have different patterns and shapes.

Here, a gap 220 may be formed between the pair of inner electrodes 214a and 214b. The gap 220 may be formed to have a height greater than the height of the pair of inner electrodes 214a and 214b and may have a width larger than a gap between the pair of inner electrodes 214a and 214b. When the volume of the gap 220 is enlarged, even if fine particles are generated from the internal electrodes 214a and 214b during the discharge by the static electricity, since the space between the internal electrodes 214a and 214b is wide, The incidence of defects can be reduced. At this time, it is preferable that the gap is a space in which discharge is started by the pair of internal electrodes 214a and 214b when static electricity flows, and the volume of the gap is set so as to satisfy resistance to static electricity. For example, the volume of the gap may be 1-15% of the total volume of the electric shock protection element 200. If the volume of the gap is less than 1% of the total volume of the electric shock protection device 200, shorting may occur between the pair of internal electrodes 214a and 214b, and resistance to static electricity may be deteriorated. If the volume of the gap exceeds 15% of the total volume of the electric shock protection device 200, the total volume of the electric shock protection device 200 increases, the mechanical strength is lowered, and distortion and depression Lt; / RTI >

Specifically, the internal electrodes 214a and 214b are disposed apart from each other so as to form a gap in the inside of a small body made of at least one pair of sheet layers 211, 212, and 213. Preferably, the pair of inner electrodes 214a and 214b are spaced apart from each other in parallel directions on the same plane.

That is, the pair of inner electrodes 214a and 214b are spaced apart from each other to form a gap d on the upper surface of the first sheet layer 211. Here, the gap d between the pair of internal electrodes 214a and 214b may be 10 to 100 占 퐉. The pair of inner electrodes 214a and 214b are pattern-printed on the upper surface of the first sheet layer 211. [

Between the pair of internal electrodes 214a and 214b corresponding to each other, an air gap 220 is provided to protect the circuit protection element and the peripheral circuits from overvoltage and to block the leakage current.

These air gaps 220 are disposed between the pair of inner electrodes 214a and 214b which are arranged in parallel to each other on the same plane and are hollow so as to fill the air, The second sheet layer 212 is laminated.

A plurality of such gaps 220 may be provided and spaced along the width direction of the internal electrodes 214a and 214b. As described above, when the number of the voids 220 is increased, the discharge path of the static electricity is increased, so that resistance to static electricity can be improved.

At this time, the gap 220 is formed to have a height h exceeding the height from the upper surface of the first sheet layer 211 to the upper end of the internal electrodes 214a and 214b. That is, as shown in FIG. 8, the cavity 220 according to an embodiment of the present invention is provided to have a height exceeding the total height of the internal electrodes 214a and 214b, thereby enlarging the volume of the entire cavity 220 .

Accordingly, even when fine particles are generated from the internal electrodes 214a and 214b at the time of discharging static electricity, it is possible to reduce the incidence of defects that can be caused by particles through the voids 220 having a large space.

8, the second portion 122b of the gap 220 is formed so as to extend on the upper surface of at least one of the pair of inner electrodes 214a and 214b spaced apart from each other And may extend all over the upper surface of the pair of inner electrodes 214a and 214b.

9A, the gap 220 'has a first portion 222a having the same height as the internal electrodes 214a and 214b and a second portion 222b having a predetermined height from the upper end of the first portion 222a And a second portion 222b.

9B, the gap 220 'includes a third portion that extends downward from the lower end of the first portion 222a to a predetermined height, and the third portion 222c includes a third portion And extend on the lower surface of the internal electrodes 214a and 214b.

At this time, when the third portion 222c is included in the gap 120, a separate receiving groove 211a for receiving the third portion 222c is formed on the upper surface of the first sheet layer 211, 1 sheet layer 211 may be recessed downward from the upper surface of the sheet layer 211 by a predetermined depth.

The void 220 is formed by removing the void material by the heat applied in the sintering process after the void material is pattern printed on the gap d. In order to prevent the air gap 220 from being deformed or damaged by pressure in the process of pressing the air gap material to form a body after stacking the first sheet layer 211 and the second sheet layer 212, Is used.

To this end, the cavity material is made of a material which can be decomposed by high-temperature heat, so that a plurality of sheet layers can be removed in the course of laminating and sintering. For example, the void material may be formed of a material that is decomposed at a temperature range of 200 to 2000 ° C.

At this time, the pair of internal electrodes 214a and 214b may be formed in various shapes and patterns, and they may be formed in the same pattern or may have different patterns.

For example, as shown in FIG. 10A, the pair of internal electrodes 214a and 214b may be provided in a bar shape having a rectangular cross section, and as shown in FIG. 10B, (214a ', 214b') may be provided in a substantially 'Y' shape having an end having a rectangular cross section.

As shown in FIG. 10C, the pair of inner electrodes 214a "and 214b" may be formed in a bar shape having an arc shape at the ends. As shown in FIG. 10D, 215b may be provided in a substantially 'Y' shape having an arc shape.

However, the cross-section of the electrode is not limited thereto, and the above-described four shapes may be combined with each other, or the end portions facing each other may be formed in a circular shape, a polygonal shape, a wave shape, I will reveal.

A gap d is formed between the ends of the pair of inner electrodes 214a and 214b facing each other and the gap 220 is formed in the gap d. At this time, a discharge material layer 224 coated on the inner wall of the gap 220 with a predetermined thickness along the height direction of the internal electrodes 214a and 214b is provided. At this time, it is noted that the discharge material layer 224 may be provided only on the inner wall of the gap 220, but may be coated to cover the open top of the gap 220. That is, the discharge material layer 224 may extend not only the inner wall of the gap 220 but also the open upper end of the gap 220.

The first sheet layer 211 and the second sheet layer 212 constituting the body may directly laminate the second sheet layer 212 on the first sheet layer 211, A pair of internal electrodes 214a and 214b formed on the upper surface of the sheet layer 211 and a separate buffer layer 213 corresponding to the height of the gap 220 may be stacked. The buffer layer 213 serves to eliminate the height deviation corresponding to the height of the internal electrodes 214a and 214b and the height of the gap 220. [

11 and 12, an air gap 314 may be formed between the internal electrodes 311a and 312a without using a separate air gap forming member in the electric shock protection element 300 have. At this time, the sidewall of the void 314 may have a layer of a discharge material.

That is, in the electric shock protection device 300, a protection sheet layer 313 is disposed between a pair of inner electrodes 311a and 312a facing each other, and at least one through hole (not shown) penetrating the protection sheet layer 313 314, respectively. Here, the through holes 314 are formed in a region where a pair of internal electrodes 111a and 112a, which are disposed on upper and lower sides of the protective sheet layer 113, are overlapped with each other.

Alternatively, the pair of inner electrodes may be spaced apart from each other so as to form a gap on the same surface of the protective sheet layer, and may have a through hole in a gap formed between the pair of inner electrodes. That is, the through holes are disposed between a pair of inner electrodes arranged in parallel on the same plane, and are provided in a hollow shape so that air can be filled.

11, the electric shock protection device 300 includes a first sheet layer 311 having a first internal electrode 311a on a lower surface thereof and a second sheet electrode layer 311 having a second internal electrode And a second sheet layer 312 provided with a through hole 314 between the first sheet layer 311 and the second sheet layer 312. The first sheet layer 311 and the second sheet layer 312 have a through- 313 are disposed.

A first sheet layer 311, a protective sheet layer 313 and a second sheet layer 312 are sequentially stacked so that the first internal electrode 311a and the second internal electrode 312a can face each other.

Accordingly, the first internal electrode 311a and the second internal electrode 312a are disposed to face each other and are spaced apart from each other by the protective sheet layer 313 at a predetermined interval, A hole 314 is disposed.

At this time, the through holes 314 disposed in the overlapping region of the first internal electrode 311a and the second internal electrode 312a may be provided in various forms.

For example, as shown in FIG. 12A, an end of a pair of first internal electrodes 311a is provided on the upper side of a bar-shaped second internal electrode 312a having a predetermined length, One of the first internal electrode 311a and the second internal electrode 312a may be disposed in a region where the first internal electrode 311a and the second internal electrode 312a overlap each other, and as shown in FIG. 12b, The through holes 314 may be arranged in a region where the through holes 314 overlap one another.

In addition, as shown in FIG. 12C, the second internal electrodes 312a are provided in two bar shapes having a predetermined length, and the first internal electrodes 311a are provided in two in a substantially Y shape, And the through holes 314 may be disposed in four portions that are overlapped with each other.

12D, the first internal electrode 311a and the second internal electrode 312a are formed in a bar shape having a predetermined length, and through holes 314 are formed in a region where the first internal electrode 311a and the second internal electrode 312a overlap each other, .

12E, the second internal electrodes 312a are provided in a single bar shape having a predetermined length, and the first internal electrodes 311a are formed in two bar shapes having a predetermined length And two through holes 314 may be disposed in the overlapping region. [0051] As shown in FIG.

The first internal electrode 311a and the second internal electrode 312a may be formed in various shapes and patterns. When the first internal electrode 311a and the second internal electrode 312a are stacked, It should be noted that it is not possible to arrange them to overlap each other.

On the other hand, the electric shock protection device 300 may include a discharge material layer coated on the inner wall of the through hole 314 to a predetermined thickness along the height direction, and may be filled with a filling material. Here, the discharge material and the filler have a low dielectric constant, no conductivity, and no short circuit when an overvoltage is applied. For this, the discharge material layer and the filler may be made of a nonconductive material including at least one kind of metal particles, and may be made of a semiconductor material containing SiC or a silicon-based component. In addition, the discharge material 115 and the filler material 116 are made of materials having different characteristics from the plurality of sheets constituting the elementary body. Here, it is found that materials having different characteristics include not only materials but also materials having different properties such as dielectric constant and conductivity even though they are homogeneous materials

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.

10: portable electronic device 12a, 12b, 12c, 12d: conductor
14:
100, 200, 300: electric shock protection element 110:
111, 112, 211,
111a, 112a, 214a, 214b, 311a, 312a:
131, 132, 231, 232: external electrode 124:
124a, 124b, 124c, 224: a discharge material layer 126, 220:

Claims (22)

An electric shock protection element disposed between a human contactable conductor of an electronic device and an internal circuit portion,
A body having a dielectric constant of not less than 20 so that a plurality of sheet layers are stacked and formed and a communication signal flowing from the conductor is passed without attenuation;
At least a pair of internal electrodes disposed at predetermined intervals in the inside of the body; And
And a gap formed between the internal electrodes,
Wherein the static electricity is passed without passing through the insulation when the static electricity flows from the conductor, and the leakage current of the external power supply flowing from the ground of the circuit part is cut off.
Vbr> Vin
Here, Vbr is a breakdown voltage of the electric shock protection element,
Vin is the rated voltage of the external power supply of the electronic device The method according to claim 1,
Wherein the rated voltage is a national standard rated voltage. The method according to claim 1,
Wherein the pair of inner electrodes are disposed on the same plane. The method according to claim 1,
Wherein the gap is equal to or greater than the gap between the pair of inner electrodes and the height is greater than or equal to the thickness of the pair of inner electrodes. The method according to claim 1,
Wherein the gap is arranged in a vertical or horizontal direction about the internal electrode. The method according to claim 1,
Wherein the plurality of air gaps are provided between the pair of inner electrodes. The method according to claim 1,
Wherein the gap comprises a layer of a discharge material applied to the inner wall at a predetermined thickness along the height direction. 8. The method of claim 7,
Wherein the discharge material layer is made of a nonconductive material or a semiconductor material including metal particles. 8. The method of claim 7,
Wherein the layer of discharge material comprises a first portion applied along the inner wall of the cavity and a second portion extending outwardly from the top of the first portion and a third portion extending outwardly from the bottom of the first portion,
Wherein the second portion is in contact with one of the pair of inner electrodes, and the third portion is in contact with the other of the pair of inner electrodes. The method according to claim 1,
Wherein the conductor performs a communication function between the electronic device and the external device. The method according to claim 1,
Wherein the internal electrode includes at least one of Ag, Au, Pt, Pd, Ni, and Cu. The method according to claim 1,
Wherein the inner electrode is formed in a polygonal shape, a circular shape, an elliptical shape, a spiral shape, or a combination thereof. The method according to claim 1,
Wherein an interval between the inner electrodes is 10 to 100 탆 and a thickness of the inner electrodes is 2 to 10 탆. The method according to claim 1,
Wherein the communication signal has a wireless communication frequency band. The method according to claim 1,
Wherein the volume of the gap is 1-15% of the total volume of the electric shock protection element. The method according to claim 1,
And the dielectric constant of the elementary body satisfies 38 or more. The method according to claim 1,
And the discharge start voltage due to the static electricity of the internal electrode is 1 to 15 kV. Human contactable conductors;
Circuitry; And
And an electric shock protection element disposed between the conductor and the circuit portion,
The electric shock protection housing,
A body having a dielectric constant of not less than 20 so that a plurality of sheet layers are stacked and formed and a communication signal flowing from the conductor is passed without attenuation;
At least a pair of internal electrodes disposed at predetermined intervals in the inside of the body; And
And a gap formed between the internal electrodes,
Wherein the static electricity is passed without passing through the insulation from the conductor when the static electricity flows into the conductor, and the leakage current of the external power source flowing from the ground of the circuit portion is blocked.
Vbr> Vin
Here, Vbr is a breakdown voltage of the electric shock protection element,
Vin is the rated voltage of the external power supply of the electronic device 19. The method of claim 18,
Wherein the conductor has at least one of an antenna, a metal case, and a conductive ornamental for communication between the electronic device and an external device. 20. The method of claim 19,
Wherein the metal case has an electric shock protection function that partially surrounds or entirely surrounds the side of the housing of the electronic device. 20. The method of claim 19,
Wherein the metal case is provided so as to surround a camera provided to be exposed to the outside on a front surface or a rear surface of the housing of the electronic device. 19. The method of claim 18,
Wherein the dielectric constant of the body satisfies 38 or more.

KR1020150148158A 2015-10-23 2015-10-23 Circuit protection device and mobile electronic device with the same KR20170047726A (en)

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