KR20170051084A - Circuit protection device - Google Patents

Circuit protection device Download PDF

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Publication number
KR20170051084A
KR20170051084A KR1020150153445A KR20150153445A KR20170051084A KR 20170051084 A KR20170051084 A KR 20170051084A KR 1020150153445 A KR1020150153445 A KR 1020150153445A KR 20150153445 A KR20150153445 A KR 20150153445A KR 20170051084 A KR20170051084 A KR 20170051084A
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KR
South Korea
Prior art keywords
electrode
electric shock
static electricity
shock protection
electronic device
Prior art date
Application number
KR1020150153445A
Other languages
Korean (ko)
Inventor
임병국
최윤석
황윤호
최재우
박규환
Original Assignee
주식회사 아모텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 주식회사 아모텍 filed Critical 주식회사 아모텍
Priority to KR1020150153445A priority Critical patent/KR20170051084A/en
Publication of KR20170051084A publication Critical patent/KR20170051084A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Abstract

The present invention provides an electric shock prevention device capable of protecting a user and/or an internal circuit from static electricity or leakage current due to an external power source. According to one embodiment of the present invention, the device is disposed between a conductor capable of being touched by a human body and an internal circuit part of an electronic device, and comprises: an element; and an electric shock prevention unit including first and second electrodes disposed in the element by being spaced apart at a predetermined interval, and a cavity formed in a region in which the first and second electrodes face each other. A facing surface area of the first and second electrodes is larger than a cross section of the first and second electrodes. To pass static electricity without a dielectric breakdown when the static electricity flows through the conductor and to block leakage current of an external power flowing from the earth of a circuit part, the electric shock prevention unit satisfies Vbr > Vin, wherein Vbr is the breakdown voltage of the electric shock prevention device and Vin is the rating voltage of the external power for the electronic device.

Description

[0001] The present invention relates to a circuit protection device,

The present invention relates to an electric shock protection device, and more particularly, to an electric shock protection device in which discharged static electricity can flow efficiently to a circuit part.

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 leakage current.

In this case, it is required to take measures to simultaneously solve the problem of electric shock protection and static electricity protection. In this case, it is necessary to develop a device that takes into account the elements that can satisfy the electrical characteristics corresponding to the signals having different characteristics. to be.

Korean Registered Patent No. 0573364 (Registration date April 17, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric shock protection device capable of protecting an internal circuit and / or a user from a leakage current caused by static electricity or an external power source.

Another object of the present invention is to provide an electric shock protection device capable of enlarging a surface area where a pair of inner electrodes face each other to allow discharged static electricity to flow efficiently to a circuit portion.

According to an aspect of the present invention, there is provided an electric shock protection device disposed between a body contactable conductor of an electronic device and a built-in circuit, comprising: a body; And an electric shock protection unit including first and second electrodes spaced apart from each other at a predetermined interval in the body, and a gap formed in a region where the first and second electrodes face each other; Wherein the surface area of the first electrode and the second electrode is larger than the cross-sectional area of the first electrode and the second electrode, and the electric shock protection device And shielding the leakage current of the external power supply flowing from the ground of the circuit part.

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.

In addition, the first electrode and the second electrode may be formed in a sawtooth shape.

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 can do.

Further, the elementary body may be made of an insulator having a dielectric constant.

The first electrode and the second electrode may include at least one of Ag, Au, Pt, Pd, Ni, and Cu.

According to the present invention, since the surface area of the region where the first electrode and the second electrode face each other is enlarged, the discharged static electricity can flow efficiently to the circuit portion.

Further, in the portable electronic device in which the conductor such as the metal case is exposed to the outside, the user and the internal circuit can be protected from the leakage current and the static electricity caused by the external power source by providing the electric shock protection element connecting the conductor and the circuit portion.

1 is a perspective view illustrating an electric shock protection device according to an embodiment of the present invention,
FIG. 2 is a sectional view taken along line A-A 'of FIG. 1,
3A to 3D are views showing various forms of a first electrode and a second electrode in an electric shock protection device according to an embodiment of the present invention,
4A and 4B are conceptual diagrams showing an application example of an electric shock protection device according to an embodiment of the present invention, and FIGS.
FIGS. 5A and 5B are schematic equivalent circuit diagrams for explaining operation of (a) leakage current and (b) static electricity 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 or similar components are denoted by the same reference numerals throughout the specification.

In the description of the electric shock protection device with reference to the drawings, the X axis is defined in the longitudinal direction of the elementary body 110 in the electric shock protection element 100, the Y axis is defined in the width direction of the elementary body 110, The direction of the height of the substrate 110 will be described.

The electric shock protection device 100 according to an embodiment of the present invention is disposed between a metal case forming an outer shape of an electronic device and a circuit portion incorporated in the electronic device to protect the static electricity flowing through the metal case, To prevent the leakage current flowing into the metal case from flowing. To this end, the following conditions can be satisfied.

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 and 100V.

The electric shock protection device 100 includes a body 110, an electric shock protection unit 120, and a pair of external electrodes 130.

The body 110 has a plurality of sheet layers sequentially stacked, and an electric shock protection unit 120 is disposed inside the body 110, and then integrally formed through a pressing and firing process.

In addition, a pair of external electrodes 130 are provided outside the body 110, and the pair of external electrodes connect the electric shock protection part to the metal case and the circuit part.

Such a body 110 may be made of an insulator having a dielectric constant. Here, the insulator may be formed of a ceramic material, a low temperature sintered ceramics (LTCC), a high temperature sintered ceramics (HTCC), and a magnetic material. At this time, the ceramic material is a metal-based oxide compound, and the metal-based oxide compound may include at least one selected from Er2O3, Dy2O3, V2O5, CoO, MoO3, SnO2, BaTiO3 and Nd2O3.

The electric shock protection unit 120 includes a gap formed between a pair of internal electrodes and a pair of internal electrodes.

The pair of internal electrodes includes a first electrode 121 and a second electrode 122. The first electrode 121 and the second electrode 122 are arranged on the same plane And spaced apart horizontally (see Figs. 1 and 2).

At this time, at least a part of the first electrode 121 and the second electrode 122 are arranged so that the lengths of the first electrode 121 and the second electrode 122 overlap each other. More specifically, the end sides of the first and second electrodes 121, Are arranged so as to overlap with each other.

The surface area of the first electrode 121 and the second electrode 122 may be greater than the height of the first electrode 121 and the second electrode 122 .

That is, the end portions of the first electrode 121 and the second electrode 122 are each formed as a surface having a curved shape rather than a flat surface, so that the distance between the first electrode 121 and the second electrode 122 And may have a length wider than the length in the height direction. Accordingly, if the surface area of the pair of inner electrodes facing each other is wide, the discharged static electricity can efficiently flow to the circuit portion.

The facing surface shapes of the first electrode 121 and the second electrode 122 are described below with reference to FIGS. 3A to 3D.

Also, The first electrode 121 and the second electrode 122 may be configured to satisfy a breakdown voltage Vbr of the electric shock protection device between the first electrode 121 and the second electrode 122, The distance between the electrodes 122 may be 10 to 100 mu m. For example, the gap between the first electrode 121 and the second electrode 122 may be 25 占 퐉.

If the distance between the first electrode 121 and the second electrode 122 is less than 10 mu m, resistance to static electricity may be weakened. If the distance between the first electrode 121 and the second electrode 122 exceeds 100 mu m, the discharge starting voltage (operating voltage) increases and the discharge of the static electricity is not smoothly discharged. .

The discharge start voltage (operating voltage) of the first electrode 121 and the second electrode 122 due to static electricity may be 1 to 15 kV. Here, if the discharge start 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, the first electrode and the second electrode disposed opposite to each other may be provided in various shapes and patterns such as a polygonal shape, a circular shape, an elliptical shape, a non-linear shape, and a combination thereof. The first and second electrodes facing each other may be provided in the same pattern and shape, or may have different patterns and shapes.

The first electrode 121 and the second electrode 122 are electrically connected to a pair of external electrodes 131 and 132 provided at both ends of the body 110, respectively.

The first electrode 121 and the second electrode 122 may include one or more of Ag, Au, Pt, Pd, Ni, and Cu. The pair of external electrodes 131, May contain at least one of Ag, Ni, and Sn components.

The gap 140 may be formed in a region where the first electrode 121 and the second electrode 122 face each other.

Here, the gap 140 is provided at a height greater than the height of the first and second electrodes 121 and 122, so that the volume of the entire gap 140 can be enlarged.

As described above, when the volume of the air gap is enlarged, even if fine particles are generated from the first electrode and the second electrode during the discharge by the static electricity, the space between the first electrode and the second electrode is wide, Can be reduced.

At this time, it is preferable that the gap is a space in which discharge is initiated by the first electrode and the second electrode when static electricity is introduced, 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 100.

If the volume of the gap is less than 1% of the total volume of the electric shock protection device 100, a short circuit may occur between the first electrode and the second electrode, and the resistance to static electricity may deteriorate.

If the volume of the gap exceeds 15% of the total volume of the electric shock protection device 100, the total volume of the electric shock protection device 100 is increased, the mechanical strength is lowered, and distortion or depression Lt; / RTI >

Here, the volume of the gap 140 can be enlarged by enlarging the surface area of the first electrode 121 and the second electrode, and the volume of the gap 140 between the first electrode 121 and the second electrode 122 The surface area can be provided in various shapes.

For example, as shown in FIG. 3A, the end of the first electrode 121 may have a sawtooth shape, and the end of the second electrode 122, which faces the end of the first electrode 121, And may have a shape corresponding to the end of the first electrode 121.

3B, the end side of the first electrode 121 may be formed in a wave shape, and the end side of the second electrode 122, which faces the end side of the first electrode 121, And may be formed in a shape corresponding to the end side of the first electrode 121.

3C, the end of the first electrode 121 may have a concave shape, and the end of the second electrode 122, which faces the end of the first electrode 121, A protrusion having a shape corresponding to the groove formed on the end side of the first electrode 121 may be protruded.

Alternatively, as shown in FIG. 3D, a plate-shaped first extended electrode 121a extending in the height direction of the body 110 may be disposed at one end of the first electrode 121, Shaped second extended electrode 122a may be disposed at one end of the second electrode 122 facing the one end of the second electrode 121. [

That is, the facing surface area of the first electrode 121 and the second electrode 122 can be widened by the first and second extended electrodes 121a and 122a.

Here, the shape of the surface where the first electrode and the second electrode face each other is not limited to the configuration shown and described in FIGS. 3A to 3D, and the surface area of the surface on which the first electrode and the second electrode face each other It can be formed in any shape as long as the shape can be widened.

Accordingly, when static electricity flowing through the metal case flows through the gap to the second electrode facing one end of the first electrode at one end of the first electrode, the first electrode and the second electrode face each other The flow of the static electricity moving from the first electrode to the second electrode can be smooth.

A discharge material layer 150 having a predetermined thickness may be applied to at least one of the upper side and the lower side of the gap 140. The discharge material layer 150 may be formed on the first and second electrodes 121, and 122, respectively.

The discharge material layer 150 connects the first electrode 121 and the second electrode 122 to lower the discharge starting voltage (operating voltage). For this, the discharge material has a low dielectric constant, no conductivity, and no short circuit when an overvoltage is applied.

Accordingly, 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 electrode 121 and the second electrode 122 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 the resistance to static electricity, thereby solving the DC shorting phenomenon when the electric shock protection device is mounted on the electronic part.

Here, the discharge material includes SiC-ZnO-based materials as an example of the discharge material. However, the present invention is not limited thereto, and the discharge material may be a material suitable for the components constituting the first electrode 121 and the second electrode 122 A non-conductive material including a semiconductor material or metal particles may be used.

The discharge material layer 150 may function even if a part of the discharge material layer 150 is damaged as a part of the discharge material layer 150 is vaporized by the electrostatic spark, The resistance to static electricity can be improved.

The electric shock protection device 100 having the above-described configuration may be disposed between the electric circuit 12 and the circuit unit 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 electrical 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 a conductive material such as a metal (aluminum, stainless steel, etc.) or an outer housing made of carbon-fiber synthetic material or other fiber-based composites, glass, ceramic, 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 particular, the metal case may be provided so as to partially surround or partially surround the side of the housing of the portable electronic device 10. In addition, the metal case may be provided to surround a camera provided to be exposed to the outside on the front surface or the rear surface of the housing of the electronic device.

As such, 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 to protect the internal circuit from leakage current and static electricity.

Such an electric shock protection device 100 may be suitably provided in accordance with the number of metal cases provided in the housing of the portable electronic device 10. [ However, when a plurality of metal cases are provided, each of the metal cases may be embedded in the housing of the portable electronic device 10 such that the electric shock protection devices 100 are individually connected.

That is, when the conductor 12 such as the metal case surrounding the side of the housing of the portable electronic device 10 is composed of three parts as shown in FIG. 4A, each of the conductors 12 is entirely covered with the anti-static device 100 So that the circuit inside the portable electronic device 10 can be protected from the leakage current and the static electricity.

In this case, when the plurality of metal cases 12a, 12b, 12c, and 12d are provided, the electric shock protection device 100 may be provided in various ways according to the roles of the metal cases 12a, 12b, 12c, and 12d. have.

For example, in the case where the camera of the portable electronic device 10 is exposed to the outside, when the electric shock protection device 100 is applied to the conductor 12d surrounding the camera, the electric shock protection device 100 May be provided in a form that blocks the leakage current and protects the internal circuit from static electricity.

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

On the other hand, 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.

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

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 down by the static electricity flowing from the electric conductor, thereby protecting the inner circuit of the rear end.

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.

100: an electric shock protection element 110:
120: internal electrode 121: first electrode
122: second electrode 130: external electrode
140: Pore 150: Discharge material layer

Claims (9)

An electric shock protection element disposed between a body contactable conductor of an electronic device and an internal circuit portion,
corpuscle; And
An electric shock protection unit including first and second electrodes spaced apart from each other at a predetermined interval in the body and a gap formed in a region where the first and second electrodes face each other; Lt; / RTI >
Wherein the surface area of the first electrode and the surface of the second electrode is larger than the cross-sectional area of the first electrode and the second electrode,
Wherein the electric shock protection device passes the static electricity without being destroyed by insulation when the static electricity flows from the electric conductor and blocks the leakage current of the external electric power supplied from the ground of the circuit part.
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 first electrode and the second electrode are formed in a concavo-convex shape. The method according to claim 1,
Wherein one end of the first electrode is formed in a wavy shape, and one end of the second electrode is formed corresponding to a shape of one end of the first electrode. The method according to claim 1,
Wherein the first electrode and the second electrode are formed in a sawtooth shape. 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. 6. The method of claim 5,
Wherein the discharge material layer is made of a nonconductive material or a semiconductor material including metal particles. 6. The method of claim 5,
Wherein the layer of discharge material comprises a first portion that is applied along an inner wall of the cavity and a second portion that extends outwardly from an upper end of the first portion and a third portion that extends outward from a lower end of the first portion, Protection device. The method according to claim 1,
Wherein said elementary body is made of an insulator having a permittivity. The method according to claim 1,
Wherein the first electrode and the second electrode comprise at least one of Ag, Au, Pt, Pd, Ni, and Cu.
KR1020150153445A 2015-11-02 2015-11-02 Circuit protection device KR20170051084A (en)

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