KR20160060545A - Circuit protection device and mobile electronic device with the same - Google Patents

Abstract

An electric shock protection device which may protect a user from leakage current due to power, and a mobile electronic device having the same are provided. According to an embodiment of the present invention, the electric shock protection device disposed between a human contact-enabled conductor and an embedded circuit unit of an electronic device comprises: an electric shock protection unit including at least two varistor material layers in which a first varistor material layer and a second varistor material layer are stacked, a plurality of first internal electrodes spaced apart from each other at regular intervals (L) on the first varistor material layer, and a plurality of second internal electrodes spaced apart from each other at regular intervals (L) on the second varistor material layer; and at least one capacitor layer passing a communication signal inputted from the conductor. The electric shock protection device passes static electricity without dielectric breakdown when the static electricity flows from the conductor thereto, blocks the leakage current of an external power source inputted from a ground of the circuit unit, and satisfies the following inequality (Vbr > Vin) to pass the communication signal inputted from the conductor, Here, Vbr is the sum of breakdown voltages respectively formed between the first internal electrodes and the second internal electrodes closest to each other, and Vin is a rated voltage of the external power source of the electronic device.

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 a portable electronic device having the same, and more particularly, to an electric shock protection device that protects a user from a leakage current by a power source, protects an internal circuit from external static electricity, minimizes attenuation of a communication signal, 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.

Meanwhile, the portable electronic device having the metal-made housing has a plurality of antennas according to function, and at least a part of the antennas is an internal antenna. The portable electronic device is disposed in the external housing of the portable electronic device, It is a tendency to use it as an antenna.

In such a case, the antenna and the internal circuit of the portable electronic device must be connected. At this time, the communication signal must be smoothly transmitted to the internal circuit without attenuation.

However, as described above, when the capacitance of a corresponding device is increased to effectively transmit a communication signal, there is a problem that the device is destroyed by external static electricity and thus the device is damaged.

Furthermore, as described above, it is difficult to realize the implementation of a high breakdown voltage for interrupting the leakage current due to the external power supply and the implementation of the high capacity capacitance for transmitting the communication signal, because of the opposite effect. Therefore, there is a demand for a protection against static electricity, a prevention of leakage current, and a high capacitance at the same time.

KR 0573364 B

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and provides an electric shock protection device capable of protecting an internal circuit and / It is an object to provide an electronic device.

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. The electric shock protection device includes at least two varistor material layers in which a first varistor material layer and a second varistor material layer are stacked, a plurality of first internal electrodes spaced apart by a predetermined distance L on the first varistor material layer, An electric shock protection unit comprising a plurality of second internal electrodes spaced apart by a predetermined distance L on the second varistor material layer; And at least one capacitor layer through which a communication signal flowing from the conductor is passed, wherein the static electricity is passed through the conductor without causing insulation breakdown when the static electricity flows into the conductor, and the leakage current of the external power source And allows a communication signal flowing from the conductor to pass therethrough.

Vbr> Vin

Here, Vbr denotes a total sum of unit breakdown voltages formed between the first internal electrode and the second internal electrode adjacent to each other,

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

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

Also, Vcp > Vbr, where Vcp may be the dielectric breakdown voltage of the capacitor layer.

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

In addition, the capacitor layer may be electrically connected in parallel with the electric shock protection portion.

The distance between the capacitor layer and the electric shock protection unit is larger than the sum of the shortest distance d1 between the first inner electrode and the second inner electrode and the shortest distance d2 between the adjacent second inner electrodes .

In addition, the distance between the capacitor layer and the electric shock protection portion may be 15-100 mu m.

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

Also, the interval between the capacitor electrodes of the capacitor layer may be 15 to 100 mu m.

The capacitor layer is formed of a plurality of sheet layers, at least a part of the sheet layer is made of a first ceramic material, the remaining sheet layer is made of a second ceramic material, and the first ceramic material and the second ceramic material The material may be a heterogeneous ceramic material.

In addition, the ceramic material is a metal-oxide compounds, the metal-based oxide compound is selected from _{Er 2 O 3, Dy 2 O} 3, Ho 2 O 3, V 2 O 5, CoO, MoO 3, SnO 2, BaTiO 3 1 jong Or more.

The ceramic material may also be low temperature co-fired ceramic (LTCC) or high temperature co-fired ceramic (HTCC).

Further, the ceramic material may be ferrite.

In addition, it may further include at least one buffer layer disposed between the electric shock protection part and the capacitor layer.

The first internal electrode and the second internal electrode may be arranged so that at least a part thereof overlaps each other.

The first internal electrode and the second internal electrode may be arranged so as not to overlap each other.

The distance L between the first internal electrode and the second internal electrode may be set to be the shortest distance d1 between the first internal electrode and the second internal electrode, (d2).

In addition, a plurality of the first varistor material layer and the second varistor material layer may be alternately stacked.

The first varistor material layer and the second varistor material layer may be either a semiconductive material containing at least one of ZnO, SrTiO ₃ , BaTiO ₃ and SiC, or a Pr and Bi-based material.

In addition, the thickness of the internal electrode may be 2-10 탆.

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 device includes at least two varistor material layers in which a first varistor material layer and a second varistor material layer are stacked, a plurality of first internal electrodes And a plurality of second internal electrodes spaced apart by a predetermined distance L on the second varistor material layer; And at least one capacitor layer for passing a communication signal flowing from the conductor, wherein the static electricity is passed through the conductor without insulation breakdown when the static electricity flows from the conductor, and the leakage current of the external power source, And allows the communication signal flowing from the conductor to pass therethrough.

Vbr> Vin, Vcp> Vbr

Here, Vbr denotes a total sum of unit breakdown voltages formed between the first internal electrode and the second internal electrode adjacent to each other,

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

Vcp is the dielectric breakdown voltage of the capacitor layer.

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.

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, It is possible to minimize the attenuation of the communication signal and to deliver the high capacitance by protecting the user and the internal circuit from the leakage current and static electricity caused by the leakage current and the static electricity.

1 is an overall perspective view illustrating 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 in Fig. 1;
Fig. 3 is a longitudinal sectional view of Fig. 1; Fig.
4A and 4B are views showing various forms of the electric shock protection unit in the electric shock protection device according to the embodiment of the present invention.
5A to 5E are conceptual diagrams illustrating application examples of an electric shock protection device according to an embodiment of the present invention.
6A to 6C 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.
FIGS. 7A and 7B are graphs showing simulation results of the pass frequency band according to the capacitance.
8A and 8B are views showing various arrangements of an electric shock protection unit and a capacitor layer in an electric shock protection device according to an embodiment of the present invention.
9A to 9E are views showing various forms of a capacitor layer made of dissimilar materials in 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.

1 to 3, an electric shock protection device 100 according to an embodiment of the present invention includes an electric shock protection unit 110 and at least one capacitor layer 120a and 120b, (110) may be a varistor.

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 And for passing a communication signal coming from the conductor. To this end, the following conditions can be satisfied:

 Vbr> Vin, Vcp> Vbr

Here, Vbr is the sum of the breakdown voltages formed between the first adjacent first inner electrode and the second inner electrode,

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

Vcp is the dielectric breakdown voltage of the capacitor layer.

At this time, external electrodes (not shown) at both ends of the electric shock protection device 100 may be electrically connected to the body-contactable conductor of the electronic device and the internal circuit portion, respectively.

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

At this time, the electric shock protection unit 110 includes varistor material layers 112 and 114 and a plurality of internal electrodes 116, 116 ', and 118.

At this time, the varistor material layer may include at least two layers of the first varistor material layer 112 and the second varistor material layer 114 alternately. Here, the first varistor material layer 112 and the second varistor material layer 114 may be any one of a semiconductive material containing at least one of ZnO, SrTiO3, BaTiO3, and SiC, or a Pr and Bi-based material have. In addition, the varistor material layer may be formed such that the diameter of the varistor material satisfies the breakdown voltage Vbr. .

The internal electrodes are spaced apart from the first varistor material layer 112 by a predetermined distance L on the plurality of first internal electrodes 112 and 112 'and the second varistor material layer 114 spaced apart by a predetermined distance L from the first varistor material layer 112 And a plurality of second internal electrodes 122,

Here, the breakdown voltage Vbr of the electric shock protection device 100 may be the sum of the unit breakdown voltages formed between the first internal electrodes 112 and 112 'and the second internal electrodes 122 closest to each other. In other words, the breakdown voltage Vbr of the electric shock protection element 100 is determined by the unit breakdown voltage formed between the first internal electrodes 112 and 112 'and the second internal electrodes 122, (112, 112 ') and the number of the second internal electrodes (122).

At this time, the first internal electrodes 112 and 112 'and the second internal electrodes 122 may have a thickness of 2 to 10 탆. If the thicknesses of the first inner electrodes 112 and 112 'and the second inner electrodes 122 are less than 2 탆, they can not serve as internal electrodes. If the thickness is more than 10 탆, Therefore, the thickness of the internal electrode or varistor material layer arranged in parallel increases, and the overall size of the electric shock protection device 100 increases, which may adversely affect miniaturization.

Each of the first internal electrodes 112 and 112 'and the second internal electrodes 122 may be disposed so that at least a part thereof is not overlapped. That is, each of the first internal electrodes 112 and 112 'and the second internal electrodes 122 may be disposed so as to be at least partially overlapped with each other, or may be disposed between the first and second internal electrodes 112 and 122 so as not to overlap each other.

At this time, the first internal electrode or the second internal electrode does not leak static electricity or leakage current to the adjacent external electrodes (not shown) of the internal electrodes 116, 116 ', 118, It is preferable that the interval is set so as to proceed normally.

For example, the spacing L between one of the first internal electrodes 112 and 112 'and the neighboring second internal electrodes 122 is greater than the spacing L between the first internal electrodes 112 and 112' (D2) between the shortest distance (d1) between the adjacent second internal electrodes (122) and the shortest distance (d2) between the neighboring second internal electrodes (122).

In addition, it is preferable that the distance between the second internal electrode 122 and the adjacent external electrode (not shown) is larger than the distance between the first internal electrode 112 and the second internal electrode 122.

Specifically, the first varistor material layer 112 may include two first inner electrodes 112 and 112 ', and the two first inner electrodes 112 and 112' may be spaced apart from each other on the same plane .

The second varistor material layer 114 may include a second internal electrode 122 on one surface thereof.

At this time, the first varistor material layer 112 and the second varistor material layer 114 are formed so that the second internal electrode 122 is spaced apart from the first internal electrodes 112 and 112 ' And are stacked in the upward and downward directions so as to be disposed.

In addition, the second internal electrode 122 may be arranged such that both end portions thereof overlap with one end side of the first internal electrodes 112 and 112 '. For this, the center of the second internal electrode 122 may be located at the center of the gap L formed between the two first internal electrodes 112 and 112 '.

Here, the first varistor material layer 112 in which the two first internal electrodes 112 and 112 'are formed may include a second varistor material layer (not shown) in which one second internal electrode 122 is formed 114 and may be laminated to the bottom of the second varistor material layer 114, as shown in Figure 4b.

4C, a plurality of unit elements formed by the first internal electrodes 116 and 116 'and the second internal electrodes 118 may be provided in parallel in the electric shock protection unit 110'. That is, The electric shock protection unit 110 'includes a first varistor material layer 112 formed with two first internal electrodes 116 and 116' and a second varistor material layer 112 formed with one second internal electrode 118 114 may be alternately stacked.

At this time, the two first varistor material layers 112 may be stacked on top and bottom of the second varistor material layer 114, respectively. The second inner electrode 118 formed on the second varistor material layer 114 includes first and second inner electrodes 116 and 116 'disposed on both ends of the first varistor material layer 114 and a second inner electrode 118 disposed on the lower portion thereof. And are arranged so as to overlap with each other at a certain region.

The first internal electrodes 116 and 116 'disposed on the second varistor material layer 114 and the first internal electrodes 116 and 116' disposed on the lower portion of the second varistor material layer 114 are formed on the upper and lower And the second internal electrode 118 may be disposed between the first internal electrodes 116 and 116 'spaced apart in the vertical direction.

At this time, the central portion of the second internal electrode 118 may be positioned at the center of the gap L formed between the two first internal electrodes 212 and 112 'disposed on the same plane.

The first varistor material layer 112 and the second varistor material layer 114 may be formed between the first inner electrodes 116 and 116 'and the second inner electrodes 118 as described above or between the spaces d1 and d2, Can be arranged in various stacking orders while satisfying the spacing L of the protrusions.

For example, the two second varistor material layers 114 may be stacked on top and bottom of the first varistor material layer 112, respectively.

Here, the second internal electrode 118 formed on the second varistor material layer 114 has a pair of first internal electrodes 116 and 116 ', which are disposed at upper and lower ends, .

At this time, it is preferable that the gap is set so that the static electricity or the leakage current does not leak to the external electrode (not shown) but can proceed normally to the first internal electrode 212 '. For example, it is preferable that the distance between the second internal electrode 118 and adjacent external electrodes (not shown) is larger than the distances d1 and d2 between the first internal electrodes 116 and 116 '.

As described above, by stacking a plurality of the first varistor material layers 112 and the second varistor material layers 114, the discharge path of the static electricity increases, thereby improving the resistance to static electricity.

The number of the first internal electrodes 112 and 112 'and the second internal electrodes 122 can be determined to satisfy the breakdown voltage Vbr of the electric shock protection element 100 according to the unit breakdown voltage formed therebetween . 1 to 3, the number of unit elements formed by the first internal electrodes 112 and 112 'and the second internal electrodes 122 is two. However, the present invention is not limited thereto. As shown in FIG.

For example, a first varistor material layer in which a plurality of first internal electrodes are spaced apart in parallel in a horizontal direction on the same plane, and a plurality of second internal electrodes are formed in parallel on a same plane, Layers may be stacked.

In this case, a plurality of neighboring first internal electrodes may be disposed between a plurality of second internal electrodes disposed at the upper portion or the lower portion, such that the first internal electrodes partially overlap each other.

The capacitor layers 120a and 120b may be electrically connected in parallel to the electric shock protection unit 110 to pass communication signals input from the electric conductor 12, such as an antenna, without attenuation. For example, the capacitor layers 120a and 120b may be disposed on at least one of the upper and lower portions of the electric shock protection portion 110. [

Here, each of the capacitor layers 120a and 120b may be a stack of a plurality of sheet layers. At this time, the plurality of sheet layers constituting the capacitor layers 120a and 120b may be made of an insulator having a dielectric constant, and may be made of a ceramic material.

For example, the ceramic material is made of a metal oxide compound containing at least one selected from Er ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ O ₃ , V ₂ O ₅ , CoO, MoO ₃ , SnO ₂ and BaTiO ₃ (LTCC) or high temperature co-fired ceramics (HTCC), or the like may be used. In addition, the ceramic material may be a ZnO-based varistor material, a Pr-Bi-based material, or the like, and may be made of Er ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ O ₃ , V ₂ O ₅ , CoO, MoO ₃ , SnO ₂ , BaTiO ₃ should be understood as an example and other metal-based oxide compounds not mentioned can also be used.

Meanwhile, the capacitor electrodes of the capacitor layers 120 and 120a may include any one or more of Ag, Au, Pt, Pd, Ni and Cu.

At this time, the plurality of capacitor electrodes constituting the capacitor layers 120a and 120b may be provided so that the interval between the pair of capacitor electrodes facing each other is in the range of 15 to 100 mu m, for example, Respectively.

If the distance between the capacitor electrodes is less than 15 mu m, it is difficult to ensure a sufficient capacitance for passing the communication signal of the wireless communication band without attenuation. If the distance exceeds 100 mu m, the distance between the capacitor electrodes is limited, Since the number of stacked sheet layers including the electrode is limited, it is difficult to realize a high capacity capacitor.

At this time, the thickness of each of the capacitor electrodes constituting the capacitor layers 120a and 120b may be set to be 1/10 to 1/2 of the gap between the pair of capacitor electrodes facing each other.

For example, when the interval between the pair of capacitor electrodes facing each other is 20 μm, the thickness of the capacitor electrode may be set to be in the range of 2 to 10 μm. If the thickness of the capacitor electrode is less than 2 mu m, the capacitor electrode can not function as an electrode. If the thickness exceeds 10 mu m, the thickness of the capacitor electrode becomes thick, so that the distance between the capacitor electrodes Since the number of stacked sheet layers including the capacitor electrodes is limited, it is difficult to realize a high capacity capacitor.

The shortest distance between the free ends of the capacitor electrodes that are not connected to the external electrodes and the external electrodes of the capacitor electrodes may be at least 20 μm and may be in the range of 20 to 100 μm.

The distance between the capacitor layers 120a and 120b and the electric shock protection unit 110 may be set to a minimum distance between the first internal electrode 116 and the second internal electrode 118, May be greater than the sum of the shortest distance between the electrode 116 'and the second internal electrode 118.

That is, it is necessary to ensure a sufficient distance from the internal electrodes 116, 116 ', 118 so that the static electricity or leakage current flowing along the first internal electrode 116, 116' or the second internal electrode 118 does not leak to the adjacent capacitor electrode desirable. At this time, the distance between the capacitor layers 120a and 120b and the electric shock protection unit 110 may be 15 to 100 μm, and the distance between the first and second internal electrodes 116 and 116 ' Is preferably larger than twice. For example, when the distance between the first internal electrodes 116 and 116 'and the second internal electrode 118 is 10 μm, the distance between the capacitor layers 120a and 120b and the electric shock protection unit 110 is 20 Mu m or more.

As described above, the electric shock protection device 100 is provided with the capacitor layers 120a and 120b so as to pass the static electricity and to block the leakage current of the external power source, and to have a capacitance suitable for the communication band It can be easily provided. Unlike the prior art in which a separate component for increasing RF reception sensitivity is used together with a suppressor, a varistor or a zener diode for protecting the internal circuit against static electricity by the capacitor layers 124a and 124b, One device has the advantage of protecting against static electricity as well as increasing RF reception sensitivity.

Such an electric shock protection device 100 may be disposed between the electric circuit 12 and the circuit part 14, such as an external metal case, in the portable electronic device 10, as shown in Fig. 5A.

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 particular, the metal case may be provided to partially surround or entirely surround the side 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.

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 anti-electrostatic 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 12a, 12b, 12c, and 12d may be embedded in the housing of the portable electronic device 10 such that the anti- have.

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. 5A, each of the conductors 12a, 12b, 12c, and 12d All of which are connected to the anti-shock device 100, thereby protecting the circuit inside the portable electronic device 10 from leakage current and static electricity.

When the plurality of metal cases 12a, 12b, 12c, and 12d are provided, the anti-shock device 100 may be provided in various ways according to the roles of the metal cases 12a, 12b, 12c, and 12d. have.

For example, when the camera of the portable electronic device 10 is exposed to the outside, when the anti-shock device 100 is applied to the conductor 12d surrounding the camera, the anti-shock 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 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 .

Meanwhile, as shown in FIG. 5B, 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.

5C, the electric shock protection device 100 may be disposed through a matching circuit (for example, R and L components) between the metal case 12 'and the FFM (front end module) 14a have. Here, the metal case 12 'may be an antenna. 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.

As shown in FIG. 5D, 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. 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.

5E, the electric shock protection device 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.

6A to 6C, the electric shock protection device 100 may have different functions depending on a leakage current due to an external power source and a static electricity and a communication signal flowing from the electric conductor 12. [

6A, when the leakage current of the external power source flows into the conductor 12 through the circuit board of the circuit portion 14, for example, the ground, the electric shock protection element 100 is notified of the breakdown voltage (Vbr) is larger than the overvoltage due to the leakage current, it can be kept open. That is, since the total breakdown voltage Vbr of the electric shock protection device 100 is larger than the rated voltage of the external power source of the portable electronic device, the electric shock protection device 100 maintains the open state without being electrically conducted, It is possible to prevent the leakage current from being transmitted.

At this time, the capacitor layers 120a and 120b provided in the electric shock protection device 100 can block the DC component included in the leakage current, and since the leakage current has a relatively lower frequency than the radio communication band, So that the leakage current can be cut off.

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. [

Further, as shown in FIG. 6B, 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 varistor. That is, since the breakdown voltage Vbr of the electric shock protection unit 110 is smaller than the instantaneous voltage of the static electricity, the electric shock protection element 100 can be electrically conducted to pass the static electricity. As a result, since the first internal electrodes 112 and 112 'and the second internal electrodes 122 are provided in the varistor material layer, the electric shock protection device 100 can prevent the nonlinear voltage characteristics of the varistor material The electrical resistance between the first internal electrodes 112 and 112 'and the second internal electrodes 122 is lowered, so that the static electricity can be passed without being electrically broken.

Since the dielectric breakdown voltage Vcp of the capacitor layers 120a and 120b provided in the electric shock protection device 100 is larger than the breakdown voltage Vbr of the electric shock protection unit 110, the static electricity is generated in the capacitor layers 120a and 120b, 120b, and can only pass through the electric shock protection unit 110. [

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.

Further, as shown in Fig. 6C, when a communication signal is input through the conductor 12, the electric shock protection element 100 functions as a capacitor. That is, the electric shock protection device 100 is configured such that the electric shock protection unit 110 is kept open to shut off the conductor 12 and the circuit unit 14, but the internal capacitor layers 120a and 120b pass the communication signal . In this manner, the capacitor layers 120a and 120b of the electric shock protection element 100 can provide the inflow path of the communication signal.

Here, the capacitances of the capacitor layers 120a and 120b are preferably set so as to pass the communication signal of the main wireless communication band without attenuation. As shown in Figs. 7A and 7B, according to the simulation result of the pass frequency band according to the capacitance, substantially no loss is transmitted in the mobile radio communication frequency band (700 MHz to 2.6 GHz) for a capacitance of 5 pF or more And exhibits a short-circuit phenomenon electrically.

However, as shown in FIG. 7B, it can be seen that the capacitance of the capacitor layer is not influenced by the reception sensitivity at the time of the communication at a capacitance of about 30 pF or more. It is preferable to use a high capacitance of 30. Or more.

As a result, the electric shock protection device 100 can pass the communication signal flowing from the conductor 12 through the high capacitance of the capacitor layers 120a and 120b without attenuation.

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. 8 to 9. FIG.

As shown in FIG. 8A, the electric shock protection element 100 'may include a plurality of electric shock protection portions 110 in the up / down direction of one capacitor layer 120.

At this time, the internal electrodes of the electric shock protection unit 110 and the capacitor electrodes of the capacitor layer 120 may be configured to have the same gap between the electrodes facing each other, but as shown in FIG. 8B, . That is, the intervals d1 and d2 between the adjacent internal electrodes of the electric shock protection unit 110 and the interval between the adjacent capacitor electrodes of the capacitor layer 120 are the same, And the interval d3 between the capacitor electrodes of the adjacent capacitor layers 120 may be larger than the interval between the internal electrodes or the capacitor electrodes.

In addition, the number of the capacitor layer 120 and the electric shock protection unit 110 constituting the electric shock protection element 100 'is not limited and may be provided in various numbers in order to secure resistance against a desired capacitance and static electricity, It is noted that the stacking relationship of the portion 110 and the capacitor layer 120 can also be variously changed.

In another embodiment, as shown in Figs. 9A to 9E, the plurality of sheet layers constituting the capacitor layer 120 may be made of different kinds of ceramic materials.

More specifically, at least one of the plurality of sheet layers constituting the capacitor layer 120 may use the first ceramic material (A), and the remaining sheet may use the second ceramic material (B).

At this time, the first ceramic material and the second ceramic material may be heterogeneous ceramic materials. Here, the meaning of 'heterogeneous' means that the physical properties are mutually consulted even if the chemical formulas are different from each other or the chemical formulas are the same.

That is, the first ceramic material and the second ceramic material include at least one selected from Er ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ O ₃ , V ₂ O ₅ , CoO, MoO ₃ , SnO ₂ , and BaTiO ₃ Metal oxide compound, ferrite, low temperature co-fired ceramic (LTCC), high temperature co-fired ceramic (HTCC), or the like.

The first ceramic material is made of a metal oxide compound containing at least one selected from Er ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ O ₃ , V ₂ O ₅ , CoO, MoO ₃ , SnO ₂ and BaTiO ₃ The second ceramic material may be made of ferrite, the first ceramic material may be made of low temperature co-fired ceramics (LTCC), and the second ceramic material may be made of high temperature co-fired ceramics (HTCC).

The first ceramic material and the second ceramic material include at least one selected from Er ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ O ₃ , V ₂ O ₅ , CoO, MoO ₃ , SnO ₂ and BaTiO ₃ Metal-based oxide compounds, and may be made of one selected from ferrite.

That is, the first ceramic material and the second ceramic material may be formed in various forms of metal oxide compound, ferrite, low temperature co-fired ceramic (LTCC) and high temperature co-fired ceramic (HTCC) Or cured.

Meanwhile, in the electric shock protection device 100 "according to the embodiment of the present invention, the capacitor layer 120 made of a different kind of ceramic material is different from the first and second ceramic materials, As shown in FIG.

9A, the capacitor layer 120 bonded to the upper part or the lower part of the electric shock protection part 110 is made of the first ceramic material A, and the capacitor located at the uppermost layer and the lowermost layer of the electric shock protection element 100 " The layer 120 may be comprised of a second ceramic material (B).

Hereinafter, for convenience of description, it is assumed that the second ceramic material is a heterogeneous material.

9A to 9D show various arrangement relationships of the first ceramic material and the second ceramic material. The non-hatched portion (A) means that the sheet is made of the first ceramic material, and the hatched portion (B) in the figure means that the sheet is made of the second ceramic material. Namely, in FIGS. 9a to 9d, reference numerals A and B refer to the material of the sheet.

More specifically, as shown in FIG. 9B, the entire plurality of sheet layers constituting the capacitor layer 120 may be made of one of the first ceramic material A and the second ceramic material B.

9C and 9D, a portion of the plurality of sheets constituting the capacitor layer 120 is made of the first ceramic material A, and among the plurality of sheets constituting the capacitor layer 120, And the remaining sheet may be made of a different second ceramic material (B).

As described above, in the electric shock protection device 100 '' according to the embodiment of the present invention, the first ceramic material A and the second ceramic material B are selected and the first ceramic material A, which is a different type of ceramic material, The capacitor layers 120a and 120b can be formed of a material having high dielectric constant by arranging them at appropriate positions so that desired characteristics can be realized and the characteristics can be freely changed according to required characteristics.

For example, when a second ceramic material, which is a different kind of ceramic material, is disposed in the capacitor layers 120a and 120b as shown in Figs. 9A to 9D, the sheet constituting the capacitor layers 120a and 120b may be made of a high- The more desirable characteristics can be realized in forming the capacitance.

9E, at least one intermediate sheet layer 130 may be disposed between the electric shock protection unit 110 and the capacitor layer 120, and the intermediate sheet layer 130 may include a capacitor layer 120, And a second ceramic material (B) identical to the first ceramic material (B). Here, the intermediate sheet layer 130 may be a separate sheet layer, or may be a buffer layer.

With this configuration, the electric shock protection element 100 " can provide a variety of capacitances suitable for the communication signal of the wireless communication band corresponding to the object to be used.

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, 200:
110, 120, 112, 114: varistor material layer
112, 112 ', 122, 116, 116', 212 ", 118, 118 ', 118"

Claims (25)

An electric shock protection element disposed between a human contactable conductor of an electronic device and an internal circuit portion,
At least two varistor material layers stacked with a first varistor material layer and a second varistor material layer, a plurality of first inner electrodes spaced a predetermined distance L on the first varistor material layer, An electric shock protection unit comprising a plurality of second internal electrodes spaced apart by a predetermined distance L on a layer; And
And at least one capacitor layer connected in parallel with the electric shock protection portion,
Wherein the static electricity is passed through the conductor without passing through the insulation when the static electricity flows from the conductor, the leakage current of the external power source flowing from the ground of the circuit part is cut off and the communication signal flowing from the conductor is passed, Protection device.
Vbr> Vin,
Here, Vbr denotes a total sum of unit breakdown voltages formed between the first internal electrode and the second internal electrode adjacent to each other,
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 any one of 240V, 110V, 220V, 120V, and 100V. The method according to claim 1,
Wherein the electric shock protection device further satisfies the following expression.
Vcp > Vbr,
Where Vcp is the breakdown voltage of the capacitor layer The method according to claim 1,
Wherein the communication signal has a wireless communication frequency band. The method according to claim 1,
Wherein the distance between the capacitor layer and the electric shock protection portion is larger than the sum of the shortest distance d1 between the first inner electrode and the second inner electrode and the shortest distance d2 between the adjacent second inner electrodes, device. 6. The method of claim 5,
Wherein the distance between the capacitor layer and the electric shock protection portion is 15 to 100 mu m. The method according to claim 1,
Wherein a thickness of the capacitor electrode of the capacitor layer is 2 to 10 占 퐉. The method according to claim 1,
Wherein an interval between the capacitor electrodes of the capacitor layer is 15 to 100 mu m. The method according to claim 1,
Wherein the capacitor layer comprises a plurality of sheet layers, at least a portion of the sheet layer is comprised of a first ceramic material, the remaining sheet layer is comprised of a second ceramic material, the first ceramic material and the second ceramic material An electric shock protection device which is a ceramic material of different kinds. 10. The method of claim 9,
Wherein the ceramic material is a metal-based oxide compound,
Electric shock protection device for the metal-based oxide compound comprises a _{Er 2 O 3, Dy 2 O} 3, Ho 2 O 3, V 2 O 5, CoO, MoO 3, SnO 2, BaTiO ₃ or more of the selected one thereof. 10. The method of claim 9,
Wherein the ceramic material is a low temperature co-fired ceramic (LTCC) or a high temperature co-fired ceramic (HTCC). 10. The method of claim 9,
Wherein the ceramic material is ferrite. The method according to claim 1,
And at least one buffer layer disposed between the electric shock protection portion and the capacitor layer. The method according to claim 1,
Wherein the first internal electrode and the second internal electrode are disposed so that at least a part thereof overlaps each other. The method according to claim 1,
Wherein the first inner electrode and the second inner electrode are disposed so as not to overlap with each other. The method according to claim 1,
The distance L between the first internal electrode and the second internal electrode is set to be the shortest distance d2 between the first internal electrode and the second internal electrode and between the shortest distance d1 between the first internal electrode and the second internal electrode, ) Is larger than the sum of the total number of the electrodes The method according to claim 1,
Wherein a plurality of the first varistor material layers and the second varistor material layers are alternately stacked. The method according to claim 1,
Wherein the first varistor material layer and the second varistor material layer are any one of a semiconductive material comprising at least one of ZnO, SrTiO ₃ , BaTiO ₃ , and SiC, or a Pr and Bi-based material. The method according to claim 1,
Wherein the thickness of the internal electrode is 2-10 占 퐉. Human contactable conductors;
Circuitry; And
A portable electronic device having an electric shock protection function comprising the electric shock protection element according to any one of claims 1 to 19 arranged between the conductor and the circuit part. 21. The method of claim 20,
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. 22. The method of claim 21,
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. 22. The method of claim 21,
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. An electric shock protection element disposed between a human contactable conductor of an electronic device and an internal circuit portion,
At least two varistor material layers stacked with a first varistor material layer and a second varistor material layer, a plurality of first inner electrodes spaced a predetermined distance L on the first varistor material layer, An electric shock protection unit comprising a plurality of second internal electrodes spaced apart by a predetermined distance L on a layer; And
At least one capacitor layer through which communication signals incoming from the conductor pass,
The first internal electrode and the second internal electrode are arranged alternately so that the distance between the first internal electrode and the second internal electrode adjacent to each other is the same,
Wherein the static electricity is passed through the conductor without passing through the insulation when the static electricity flows from the conductor, the leakage current of the external power source flowing from the ground of the circuit part is cut off and the communication signal flowing from the conductor is passed, Protection device.
Vbr> Vin,
Here, Vbr denotes a total sum of unit breakdown voltages formed between the first internal electrode and the second internal electrode adjacent to each other,
Vin is the rated voltage of the external power supply of the electronic device An electric shock protection element disposed between a human contactable conductor of an electronic device and an internal circuit portion,
At least two varistor material layers stacked with a first varistor material layer and a second varistor material layer, a plurality of first inner electrodes spaced a predetermined distance L on the first varistor material layer, An electric shock protection unit comprising a plurality of second internal electrodes spaced apart by a predetermined distance L on a layer; And
At least one capacitor layer through which communication signals incoming from the conductor pass,
The first internal electrode and the second internal electrode are alternately arranged so that a unit element is formed between the first internal electrode and the second internal electrode which are adjacent to each other,
Wherein the static electricity is passed through the conductor without passing through the insulation when the static electricity flows from the conductor, the leakage current of the external power source flowing from the ground of the circuit part is cut off and the communication signal flowing from the conductor is passed, Protection device.
Vbr> Vin,
Here, Vbr is a sum of the unit breakdown voltages,
Vin is the rated voltage of the external power supply of the electronic device

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