TWI614771B - Complex protection device and electronic device having the same - Google Patents

Abstract

The invention provides a composite protection device, which comprises: a stacked body; a plurality of internal electrodes disposed in the stacked body; and a dielectric layer disposed between two internal electrodes in the stacked body; And external electrodes disposed on two side surfaces of the stacked body facing each other and connected to the plurality of internal electrodes. The dielectric constant of the dielectric layer is larger than the dielectric constant of the stacked body.

Description

Composite protection device and electronic device having the same

The present invention relates to a composite protection device, and more specifically, to a composite protection device provided in various electronic devices to protect the electronic device or a user from touching voltage and current.

The main purpose of mobile communication terminals has changed from voice communication to data communication services, and then evolved into smart-based convenience services for life. In addition, as smartphones become more versatile, various frequency bands are being used. That is, various functions using different frequency bands (such as a wireless local area network (LAN), Bluetooth, and Global Positioning System (GPS)) in one smart phone have been adopted. In addition, as electronic devices are highly integrated, the density of internal circuits in a limited space increases, and noise interference will inevitably occur between the internal circuits. Multiple circuit protection devices are currently used to suppress noise at various frequencies of portable electronic devices and noise between internal circuits. For example, a capacitor, a chip bead, a common mode filter, etc. are currently used to remove noise in different frequency bands.

In recent years, due to the emphasis on the elegant image and durability of smart phones, Therefore, the supply of terminals using metallic materials is increasing. That is, the supply of smart phones using metal to make borders or other housings except for the front image display section to use metal is increasing.

However, when a smartphone is used while charging a smartphone using a metal case using a non-genuine charger, an electric shock accident may occur. That is, since an overcurrent protection circuit is not established or charging is performed using a non-original charger or a faulty charger using low-quality components, an electric shock current may occur, and thus the electric shock current may be applied to a ground terminal of a smart phone (ground terminal) and then applied to the metal case causing an electric shock to a user who contacts the metal case.

To prevent electric shock, a rheostat can be used. Because the varistor has a very high non-linear current-voltage behavior, the varistor can still provide circuit protection despite overvoltage. In a varistor used as a composite protection device, in order to protect a circuit from an electrostatic discharge (ESD) voltage, a breakdown voltage must be lower than the electrostatic discharge voltage and higher than an electric shock voltage. That is, the breakdown voltage of the varistor must be lower than the electrostatic discharge voltage and higher than the electric shock voltage, and thus the varistor can block the electric shock voltage and bypass the electrostatic discharge voltage.

In order to achieve a high breakdown voltage of the varistor, the sheet of the stacked body must be increased in thickness, and in this case, the capacitance may be reduced. However, in the case of using a metal case of an electronic device as an antenna, if a composite protection device having a low capacitance is used, the metal case may interfere with a radio frequency (RF) signal to reduce the sensitivity of the antenna. In addition, commercial varistor compositions (bismuth series varistor composition, actinide series varistor group In the product), because of the low dielectric constant of the material, it is difficult to achieve a varistor of a composite protection device with a high breakdown voltage and which does not interfere with radio frequency signals.

(Prior technical literature)

Korean Patent Registration No. 10-0876206

The invention provides a composite protection device provided in an electronic device such as a smart phone to prevent a user from being shocked by an electric shock voltage input from a charger.

The invention also provides a composite protection device using a rheostat.

The invention also provides a composite protection device capable of increasing the breakdown voltage and simultaneously increasing the capacitance.

According to an exemplary embodiment, a composite protection device includes: a stacked body in which at least one sheet is stacked; a plurality of internal electrodes disposed in the stacked body; and a dielectric layer disposed in the plurality of On at least a portion between internal electrodes; and an external electrode disposed on two side surfaces of the stacked body facing each other and connected to the plurality of internal electrodes, wherein a dielectric constant of the dielectric layer ( The dielectric constant is larger than the dielectric constant of the stacked body.

The dielectric constant of the dielectric layer may be 2 to 300 times larger than the dielectric constant of the stacked body.

The stacked body may have a dielectric constant of 20 to 600, and the dielectric layer may have a dielectric constant of 100 to 3000.

The stacked body may be formed by using a varistor material.

The dielectric layer may be formed by printing on a selected sheet or forming a block shape.

An opening may be formed in a selected sheet of the stacked body, and the dielectric layer may be disposed within the opening.

The dielectric layer and the internal electrode in contact with the dielectric layer may constitute a capacitor portion, and may be spaced apart from the internal electrode of the capacitor portion and the internal electrode of the capacitor portion. An electrostatic discharge protection portion is formed between the internal electrodes.

The electrostatic discharge protection portion may have a breakdown voltage higher than an electric shock voltage and lower than an electrostatic discharge voltage.

The composite protection device may further include a first external electrode and a second external electrode disposed on two side surfaces of the stacked body, wherein the plurality of internal electrodes may be spaced apart from each other in a thickness direction of the stacked body. The predetermined distance is apart, and the internal electrodes may have some regions alternately connected to the first and second external electrodes and other regions spaced apart from each other.

The composite protection device may further include a first internal electrode, a second internal electrode, and a third internal electrode spaced apart from each other, wherein the dielectric layer may be partially exposed to the second internal electrode and the third internal electrode. Between the electrodes, and the distance between the first internal electrode and the second internal electrode along the surface of the dielectric layer may be smaller than the distance between the second internal electrode and the third internal electrode along the A distance of the surface of the dielectric layer, and the distance between the first internal electrode and the second internal electrode may be smaller than a distance between the external electrodes spaced from the first internal electrode from.

The composite protection device may further include first to fourth internal electrodes spaced apart from each other, wherein the dielectric layer may be disposed between the third and fourth internal electrodes, and may be disposed between An electrostatic discharge protection layer is disposed between the first internal electrode and the second internal electrode, and a distance between the first internal electrode and the second internal electrode along a surface of the dielectric layer may be less than A distance between the third internal electrode and the fourth internal electrode along the surface of the dielectric layer, and the distance between the first internal electrode and the second internal electrode may be less than A distance between the external electrodes spaced from the first internal electrode and the second internal electrode.

The composite protection device may further include first to fourth internal electrodes spaced apart from each other, wherein the first internal electrode may have each connected to the first external electrode and the second external electrode. One end portion of the first electrode and another end portion including each of the first external electrode and the second external electrode spaced apart from each other, the dielectric layer may be disposed on the third internal electrode And the fourth internal electrode, and an electrostatic discharge protection part may be disposed between the first internal electrode and the second internal electrode, and connected to the first internal of the first external electrode A sum of a distance between each of the electrode and the first internal electrode connected to the second external electrode and the second internal electrode may be smaller than the first electrode connected to the first external electrode. A distance between the internal electrode and the first internal electrode connected to the second external electrode, and between the second internal electrode and each of the third internal electrode and the fourth internal electrode distance.

At least one dielectric layer may be disposed between the plurality of internal electrodes, and at least one conductive layer may be disposed between the plurality of internal electrodes and the dielectric layer.

A distance between the conductive layers along a surface of the dielectric layer may be greater than a distance between the internal electrodes along the surface of the dielectric layer.

At least a part of each of the external electrodes may be formed by mixing glass and metal powder.

Each of the internal electrodes may have a thickness of 1 to 10 micrometers, and each of the external electrodes may have a thickness of 2 to 100 micrometers.

The external electrode may further include a nickel plating layer and a tin plating layer, and the nickel plating layer may have a thickness of 1 to 10 micrometers, and the tin plating layer may have a thickness of 2 to 10 micrometers.

According to another exemplary embodiment, there is provided an electronic device including a conductive body and an internal circuit capable of contacting a user, the electronic device including: a composite protection device disposed between the conductive body and the internal circuit, The composite protection device includes: a stacked body, at least one sheet of material is stacked in the stacked body; a plurality of internal electrodes are disposed in the stacked body; and a capacitor portion includes a plurality of internal electrodes disposed between the plurality of internal electrodes. A dielectric layer on at least a portion of the capacitor; and a protective portion disposed between the internal electrode of the capacitor portion and at least one internal electrode spaced from the internal electrode of the capacitor portion, wherein the dielectric The dielectric constant of the layer is larger than that of the stacked body, the protection portion has a breakdown voltage higher than the electric shock voltage and lower than the electrostatic discharge voltage, and the composite protection device is disposed in the internal circuit And the metal case of the electronic device to block the electric shock Press and bypass the electrostatic discharge voltage.

100‧‧‧ stacked body

200, 210, 210a, 210b, 220, 230, 240‧‧‧ internal electrodes

300, 310, 320‧‧‧ dielectric layers

400, 410, 420‧‧‧ external electrodes

500, 510, 520, 530, 540‧‧‧ conductive layer

1000‧‧‧ Electrostatic Discharge Protection Department

2000‧‧‧Capacitor Department

A1, A2, A3, A4, B, B1, B2, C, C1, C2, D, E, F, G, H, I, I1, I2‧‧‧ distance

X, Y, Z‧‧‧ directions

Reading the following detailed description in conjunction with the accompanying drawings, various exemplary embodiments can be understood in more detail. In the drawings: FIG. 1 is a perspective view of a composite protection device according to an exemplary embodiment.

2 and 3 are cross-sectional views of a composite protection device according to an exemplary embodiment.

4 to 9 are cross-sectional views of a composite protection device according to other exemplary embodiments.

Hereinafter, specific embodiments will be explained in detail with reference to the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments described herein. In contrast, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

FIG. 1 is a perspective view of a composite protection device according to an exemplary embodiment, and FIGS. 2 and 3 are cross-sectional views. That is, FIG. 2 is a sectional view taken along one direction (X direction) shown in FIG. 1, and FIG. 3 is a sectional view taken along another direction (Y direction) perpendicular to the one direction.

1 to 3, a composite protection device according to an exemplary embodiment may include: a stacked body 100 having a first dielectric constant; a plurality of internal electrodes 200 (internal The electrode 210, the internal electrode 220, and the internal electrode 230) are disposed in the stacked body 100; the dielectric layer 300 is disposed inside the stacked body 100 and has a second dielectric constant larger than the first dielectric constant; and the outside The electrodes 400 (the external electrode 410 and the external electrode 420) are disposed outside the stacked body 100 and connected to the internal electrode 200. Here, an electrostatic discharge protection part 1000 may be formed between at least two internal electrodes in the stacked body 100 (for example, between the first and second internal electrodes 210 and 220), and at least two electrodes (for example, the first The two internal electrodes 220 and the third internal electrode 230) may form a capacitor portion 2000 together with the dielectric layer 300 between the at least two electrodes. That is, the composite protection device according to the exemplary embodiment may include an electrostatic discharge protection part 1000 and a capacitor part 2000, wherein a dielectric constant of the capacitor part 2000 is larger than a dielectric constant of the electrostatic discharge protection part 1000, and thus the composite protection device may be Increase the capacitance. The composite protection device is provided, for example, between a metal case of an electronic device and an internal circuit. Therefore, an electric shock voltage transmitted to the metal case via the internal circuit can be blocked, and an electrostatic discharge voltage transmitted to the internal circuit via the metal case from the outside can be bypassed. That is, the composite protection device can function as an electric shock prevention device provided in an electronic device to block an electric shock voltage and a circuit protection device bypassing the electrostatic discharge voltage.

The stacked body 100 may be formed by stacking a plurality of sheets. Each of the sheets may have an approximately rectangular shape and be provided in a plate shape having a predetermined thickness, and the sheets may be stacked to form a stacked body 100. Therefore, the stacked body 100 may have a hexahedral shape, and as illustrated in FIG. 1, the stacked body 100 may be manufactured in a hexahedral shape, in which a length in one direction (for example, the X direction) is greater than The length in the other direction (Y direction) perpendicular to the one direction, and the height in the Z direction is less than the height in the X direction and less than or equal to the height in the Y direction. The plurality of sheets constituting the stacked body 100 may have the same dielectric constant, which, for example, has a dielectric constant of 10 to 600. Alternatively, the plurality of sheets may have different dielectric constants from each other, and although the sheets have different dielectric constants, each of the sheets may have a dielectric constant of 10 to 600. Dielectric constant. Here, each of the sheets may be manufactured using a material having varistor characteristics. For example, the sheet may be manufactured using a samarium-based ceramic material, a bismuth-based ceramic material, or an ST-based ceramic material. The stacked body 100 may be formed using a material having a diode characteristic. That is, the stacked body 100 may be formed of a material having a varistor characteristic or a diode characteristic such that a current flows through the stacked body 100 when a voltage higher than a breakdown voltage is applied. In addition, an outer surface of the stacked body 100 may be coated with an insulating material such as a glassy material. Here, although an insulating material is applied to the outer surface of the stacked body 100, the internal electrode 200 in the stacked body 100 may be electrically connected to the external electrode 400.

The plurality of internal electrodes 200 (internal electrode 210, internal electrode 220, and internal electrode 230) may be disposed in the stacked body 100. For example, the first internal electrode 210, the second internal electrode 220, and the third internal electrode 230 may be spaced a predetermined distance from the lower side of the stacked body 100. The plurality of internal electrodes 200 may be formed of a conductive material such as a metal including at least one component of silver, gold, platinum, palladium, nickel, and copper or an alloy thereof. In addition, each of the internal electrodes 200 may have a thickness of 1 to 10 micrometers. Here, the first internal electrode 210 may have one end side connected to the first external electrode 410 and the other end side spaced apart from the second external electrode 420, and the second internal The electrode 220 may have one end side connected to the second external electrode 420 and the other end side spaced apart from the first external electrode 410, and the third internal electrode 230 may have one end side connected to the first external electrode 410 and be connected with The other end side of the second external electrode 420 is spaced apart. That is, the plurality of internal electrodes 200 may have one end side alternately connected to the first and second external electrodes 410 and 420 in the vertical direction and the other end side spaced apart from the external electrode 400. In addition, a distance between the first internal electrode 210 and the second internal electrode 220 may be greater than a distance between the second internal electrode 220 and the third internal electrode 230. That is, at least one distance between the internal electrodes 200 may be different from at least one of the distances between the internal electrodes 200. The electrostatic discharge protection part 1000 may be disposed between the first internal electrode 210 and the second internal electrode 220, and the dielectric layer 300 may be disposed between the second internal electrode 220 and the third internal electrode 230 to form the capacitor part 2000. In addition, the horizontal length of the first internal electrode 210 may be greater than the horizontal length of each of the second internal electrode 200 and the third internal electrode 230, and the width of the first internal electrode 210 may be greater than or equal to the second internal electrode 220. And the width of each of the third internal electrodes 230. Therefore, the area of the first internal electrode 210 may be larger than the area of each of the second and third internal electrodes 220 and 230, and the second and third internal electrodes 220 and 230 may have the same area. In addition, the length of the first internal electrode 210 may be longer than the distance between the first internal electrode 210 and the second internal electrode 220. Here, the first internal electrode 210 may overlap the dielectric layer 300 and have a length capable of being connected to the external electrode 400. That is, the dielectric layer 300 may be spaced apart from the external electrode 400 and have a predetermined length within the stacked body 100, and the first internal electrode 210 may overlap the entire area of the dielectric layer 300 and It has a length capable of being connected to one end side of the first external electrode 410. The second and third internal electrodes 220 and 230 may be spaced apart from each other by a dielectric layer 300 between the second and third internal electrodes 220 and 230. At least a portion of each of may not overlap the dielectric layer 300. That is, the second internal electrode 220 may be connected to the second external electrode 420 and formed in a direction (ie, the X direction) of the first external electrode 410, and a part of the second internal electrode 220 may overlap the dielectric layer 300. And the rest of the second internal electrode 220 may not overlap the dielectric layer 300. In addition, the third internal electrode 230 may be connected to the first external electrode 410 and formed in a direction (ie, the X direction) of the second external electrode 420, and a part of the third internal electrode 230 may overlap the dielectric layer 300 and The rest of the third internal electrode 230 may not overlap the dielectric layer 300. Therefore, a lower portion of the dielectric layer 300 may be exposed through the second internal electrode 220, and an upper portion of the dielectric layer 300 may be exposed through the third internal electrode 230, where regions different from each other may be exposed. In addition, the exposed area of the dielectric layer 300 may be formed on the second internal electrode 220 and the third internal electrode 230 to have the same width. Here, the length of a region of each of the second internal electrode 220 and the third internal electrode 230 that does not overlap with the dielectric layer 300 (that is, between the second internal electrode 220 and the third internal electrode 230 passes through The shortest distance of the exposed dielectric layer 300) can be adjusted according to the distance between the first internal electrode 210 and the second internal electrode 220, and the distance between the first internal electrode 210 and the second internal electrode 220 can be less than the second A distance of a region of each of the internal electrode 220 and the third internal electrode 230 that does not overlap the dielectric layer 300. That is, as illustrated in FIG. 2, the first internal electrode 210 and the second internal electrode 220 The distance B between them may be smaller than the distance A1 from the end of the third internal electrode 230 to the second internal electrode 220 through the dielectric layer 300 and the end of the second internal electrode 220 to the third internal electrode 230 through the dielectric layer 300. Each of the distances A2. In addition, a width of each of the second and third internal electrodes 220 and 230 may be smaller than a width of the dielectric layer 300. That is, as illustrated in FIG. 3, the width of each of the second and third internal electrodes 220 and 230 may be smaller than the width of the dielectric layer 300 at the center portion of the dielectric layer 300. Here, as illustrated in FIG. 3, a distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than a distance from one end side of the third internal electrode 230 to the second via the dielectric layer 300. The distance A3 of the end portion on one end side of the internal electrode 220 and the distance A4 from the end portion on the other end side of the second internal electrode 220 to the end portion on the other end side of the third internal electrode 230 via the dielectric layer 300. Each. That is, the distance B may be smaller than each of the distance A1 and the distance A2 and the distance A3 and the distance A4 so that the electrostatic discharge voltage is not transmitted through the second and third internal electrodes 220 and 230 of the capacitor section 2000, and It is bypassed by the ESD protection part 1000 between the second internal electrode 220 and the first internal electrode 210. Further, the distance C from the end of the first internal electrode 210 to each of the external electrodes 400 must be greater than the distance B. This is to prevent the electrostatic discharge voltage from being transmitted from the external electrode 400 through the first internal electrode 210. Therefore, the distance B must be smaller than each of the distance A1, the distance A2, the distance A3, the distance A4, and the distance C. That is, since the electrostatic discharge voltage is transmitted through a short conductive path, the distance between the electrostatic discharge protection part 1000 and the capacitor part 2000 must be smaller than the distance between the dielectric layer 300 and the internal electrodes 220 and 230 of the capacitor part 2000. The surface distance between each is such that the electrostatic discharge voltage is bypassed by the electrostatic discharge protection part 1000. When the outer surface of the stacked body 100 is coated with an insulating material, the distance between the first internal electrode 210 and each of the external electrodes 400 may be less than the distance B, and thus may be 50 micrometers or less, such as It can be in the range of 10 to 50 microns.

The dielectric constant of the dielectric layer 300 may be larger than the dielectric constant of each of the sheets of the stacked body 100. For example, the dielectric constant of the dielectric layer 300 may be 5 to 300 times greater than the dielectric constant of each of the sheets of the stacked body 100. For example, the dielectric layer 300 may have a dielectric constant of 200 to 3000. The dielectric layer 300 may be formed by a printing method after the predetermined area of the at least one sheet is removed, or by burying the dielectric layer 300 in a block shape. The dielectric layer 300 may be formed by a printing method after manufacturing a material having a larger dielectric constant than the stacked body 100 into a paste shape. For example, the dielectric layer 300 may be made of a material including at least one of dielectric material powders such as MLCC, BaTiO ₃ , BaCO ₃ , TiO ₂ , Nd ₂ O ₃ , Bi ₂ O ₃ , ZnO, and Al ₂ O ₃ . form. In addition, when the dielectric layer 300 is inserted in a block shape, an opening having a predetermined size may be formed in the stacked body 100, and a block having a size corresponding to the size of the opening may be formed, and then the The block is inserted into the opening. Here, the block may be formed by cutting a sheet having a predetermined thickness. The dielectric layer 300 may have a thickness of 1 micrometer or more, such as a thickness corresponding to 0.5% to 50% of the thickness of the stacked body 100. When the dielectric layer 300 has a thickness equal to or greater than the thickness of one sheet constituting the stacked body 100, an opening having a predetermined size may be formed in at least one sheet, and then a dielectric paste may be printed in the opening. Body to form a dielectric layer 300. That is, the dielectric layer 300 may be printed on the surface of the sheet, or the dielectric layer 300 may be printed after the openings are formed in at least one sheet. In addition, the dielectric layer 300 may be formed in the horizontal direction of the stacked body 100 with an area corresponding to 25% to 85% of the area of the stacked body 100. Here, when the dielectric layer 300 is formed using a material having a high dielectric constant, the thickness of the dielectric layer 300 can be increased or the area of the dielectric layer 300 can be reduced to increase the capacitance, and when the dielectric layer 300 is used When a material with a low dielectric constant is formed, the thickness of the dielectric layer 300 can be reduced or the area of the dielectric layer 300 can be increased to increase the capacitance. When the dielectric layer 300 is formed to have a thickness larger than the maximum thickness or a smaller area than the smallest area, the effect of increasing the capacitance of the composite protection device may become weaker. When the dielectric layer 300 is formed smaller than the minimum thickness, The thickness of the capacitor portion 2000 of the composite protection device may be too thin to deteriorate the short voltage blocking effect, and when the dielectric layer 300 is formed to a thickness exceeding the maximum thickness, cracks or separation may occur, for example. Layer and other process defects.

The external electrode 400 (the external electrode 410 and the external electrode 420) may be disposed on two side surfaces of the stacked body 100 facing each other, and selectively connected to the plurality of internal electrodes 200. That is, the external electrode 400 may include a first external electrode 410 and a second external electrode 420 disposed on two side surfaces of the stacked body 100 facing each other in the X direction. Each of the external electrodes 400 may be provided as at least one layer. The external electrode 400 may be formed of a metal layer such as silver, and at least one plating layer may be disposed on the metal layer. For example, each of the external electrodes 400 may be formed by stacking a copper layer, a nickel plating layer, and a tin or tin / silver plating layer. In addition, the external electrode 400 may be formed by mixing a multi-component glass frit using, for example, 0.5% to 20% Bi ₂ O ₃ or SiO ₂ as a main component, and a metal powder. Here, the mixture of the glass frit and the metal powder may be prepared in a paste form and applied to both surfaces of the stacked body 100. As described above, since the frit is contained in the external electrode 400, the adhesion between the external electrode 400 and the stacked body 100 can be improved, and the contact reaction between the internal electrode 200 and the external electrode 400 can be improved. In addition, after the conductive paste containing glass is applied, at least one plating layer may be disposed on the conductive paste to form the external electrode 400. That is, a metal layer containing glass may be provided, and the at least one plating layer may be disposed on the metal layer to form the external electrode 400. For example, in the external electrode 400, after forming the layer containing a glass frit and at least one of silver and copper, electroplating or electroless plating may be performed to sequentially form a nickel plating layer and a tin plating layer. Here, the thickness of the tin plating layer may be equal to or greater than the thickness of the nickel plating layer. The external electrode 400 may have a thickness of 2 to 100 micrometers, the nickel plating layer may have a thickness of 1 to 10 micrometers, and the tin plating layer may have a thickness of 2 to 10 micrometers.

The composite protection device has a length L of 0.3 mm to 1.1 mm in one direction (ie, the X direction) and a width W of 0.15 mm to 0.55 mm in the other direction (ie, the Y direction) perpendicular to the one direction And has a thickness of 0.15 mm to 0.55 mm in the Z direction. For example, the composite protection device may be 0.9 mm to 1.1 mm, 0.45 mm to 0.55 mm, and 0.45 mm to 0.55 mm; 0.55 mm to 0.65 mm, 0.25 mm to 0.35 mm, and 0.25 mm to 0.35 mm; or 0.35 mm to 0.45 mm, 0.15 mm to 0.25 mm, and 0.15 mm to 0.25 mm. That is, the composite protection device may have a length: width: thickness ratio of 2 to 3: 1 to 2: 1 to 2. Preferably, the length × width × thickness may be 1.0 mm X 0.5 mm x 0.5 mm, 0.6 mm x 0.3 mm x 0.3 mm, and 0.4 mm x 0.2 mm x 0.2 mm. That is, the composite protection device may have a length: width: thickness ratio of 2: 1: 1. The dimensions of the device may be based on the standards of a typical surface mounting technology (SMT) device. In addition, the composite protection device may have a capacitance of 2 pico method (pF) to 150 pico method.

As described above, in the composite protection device according to the exemplary embodiment, the dielectric layer 300 having a dielectric constant larger than that of the stacked body 100 may be disposed within the stacked body 100 formed of a varistor material. Therefore, a high breakdown voltage of the composite protection device can be achieved, and at the same time, the total capacitance of the composite protection device can be increased. Here, the rated voltage of the composite protection device may be, for example, 100 volts to 240 volts, and the breakdown voltage may be, for example, 320 volts or more. In addition, the electric shock voltage may be equal to or higher than the operating voltage of the circuit, and the electrostatic discharge voltage generated by external static electricity may be higher than the breakdown voltage. Therefore, in the composite protection device, the current does not flow between the external electrode 410 and the external electrode 420 under the rated voltage and the electric shock voltage, but the current flows through the electrostatic discharge protection part 1000 under an electrostatic discharge voltage having a higher breakdown voltage so that The electrostatic discharge voltage can be bypassed. Therefore, the composite protection device can bypass the electrostatic discharge voltage applied to the internal circuit from the outside through the metal case, and the composite protection device can block the electric shock voltage applied from the internal circuit to the metal case. Here, the RF signal can flow through the capacitor section 2000. Further, in the composite protection device according to the exemplary embodiment, the thickness of the electrostatic discharge protection portion 1000 is smaller than the distance between each of the internal electrodes 220 and 230 of the capacitor portion 2000 and the dielectric layer 300 of the capacitor portion 2000. . That is, the short-circuit current caused by the electric shock voltage can flow through the The short-circuit portion of the conductive layer, and since the thickness of the electrostatic discharge protection portion 1000 is smaller than the distance between each of the internal electrodes 220 and 230 of the capacitor portion 2000 and the dielectric layer 300 of the capacitor portion 2000, a short-circuit current can flow To the electrostatic discharge protection part 1000. Therefore, a high breakdown voltage can be achieved without reducing the capacitance, and although the capacitance is increased, the electrostatic discharge voltage can be bypassed by the electrostatic discharge protection part 1000 to function as a normal composite protection device. That is, when the faulty charger introduces the electric shock voltage from the internal circuit into the metal case, the insulation resistance state can be maintained so that no leakage current flows, and the electrostatic discharge protection part 1000 can bypass static electricity that is larger than the electric shock voltage. The voltage is discharged to maintain a high insulation resistance state without damaging the device. Therefore, the electrostatic discharge protection part 1000 may be disposed in an electronic device including a metal case to continuously prevent an electric shock generated in a faulty charger from being transmitted to a user through the metal case of the electronic device without a dielectric breakdown. And, in addition, insulation breakdown due to electrostatic discharge voltage does not occur.

The composite protection device can be modified according to various embodiments, and various embodiments can be described below. The description overlapping with the foregoing embodiment will be omitted below.

FIG. 4 is a cross-sectional view of a composite protection device according to another exemplary embodiment.

Referring to FIG. 4, a composite protection device according to another exemplary embodiment may include: a stacked body 100 having a first dielectric constant; and a plurality of internal electrodes 200 (internal electrode 210, internal electrode 220, and internal electrode 230) disposed at In the stacked body 100, a dielectric layer 300 is disposed inside the stacked body 100 and has a second dielectric constant larger than the first dielectric constant; and an external electrode 400 (external electrode 410 and external electrode 420) is disposed in the stacked body 100 is external and connected to the internal electrode 200. Here, the dielectric layer 300 may be completely disposed in the longitudinal direction of the first external electrode 410 and the second external electrode 420. That is, the dielectric layer 300 may have one end portion connected to the first external electrode and the other end portion connected to the second external electrode 420. In addition, the dielectric layer 300 may have the same size as a sheet constituting the stacked body 100. That is, the dielectric layer 300 may have the same length as the stacked body 100 in the X direction and the same width as the stacked body 100 in the Y direction or a width different from the width of the stacked body 100. Here, at least a part of the dielectric layer 300 may not overlap the second and third internal electrodes 220 and 230. That is, a lower portion of the dielectric layer 300 may contact one region of the stacked body 100 through the second internal electrode 220, and an upper portion of the dielectric layer 300 may contact another region of the stacked body 100 through the third internal electrode 230. . In a composite protection device according to another exemplary embodiment, a distance A1 from an end portion of the third internal electrode 230 along the surface of the dielectric layer 300 to the second external electrode 420 and an edge portion from the end of the second internal electrode 220 Each of the distances A2 from the surface of the dielectric layer 300 to the first external electrode 410 may be greater than the distance B between the first and second internal electrodes 210 and 220. In addition, a distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than a distance C between an end of the first internal electrode 210 and the second external electrode 420. When the outer surface of the stacked body 100 is coated with an insulating material, the distance C between the first internal electrode 210 and each of the internal electrodes 400 may be less than the distance B, and thus may be 50 micrometers or less than 50 micrometers, for example It can be in the range of 10 microns to 50 microns.

FIG. 5 is a cross-sectional view of a composite protection device according to still another exemplary embodiment.

Referring to FIG. 5, a composite protection device according to still another exemplary embodiment may include: The stacked body 100 has a first dielectric constant; a plurality of internal electrodes 200 (internal electrode 210, internal electrode 220, internal electrode 230, and internal electrode 240) are disposed in the stacked body 100 and located on a surface of the stacked body 100; The electrical layer 300 is disposed on the stacked body 100 and has a second dielectric constant larger than the first dielectric constant; and an external electrode 400 (external electrode 410 and external electrode 420) is disposed outside the stacked body 100 and is connected to Internal electrode 200. That is, in the composite protection device according to still another exemplary embodiment, the capacitor portion 2000 may be disposed on one surface of the stacked body 100 in the Z direction (ie, its thickness direction), for example, on the top of the stacked body 100. On the surface. In addition, the internal electrode 200 may include a first internal electrode 210, a second internal electrode 220, a third internal electrode 230, and a fourth internal electrode 240. An electrostatic discharge may be provided between the first internal electrode 210 and the second internal electrode 220. The protection portion 1000 may include a capacitor portion 2000 between the third internal electrode 230 and the fourth internal electrode 240.

The internal electrodes 210, 220, 230, and 240 may be disposed inside the stacked body 100, and a part of the internal electrodes 210, 220, 230, and 240 may be disposed on a surface of the stacked body 100. That is, the first internal electrode 210 and the second internal electrode 220 may be vertically spaced apart from each other within a predetermined distance within the stacked body 100, and the third internal electrode 230 may be spaced apart from the second internal electrode 220 and then disposed on the second internal electrode. 220, and the fourth internal electrode 240 may be spaced apart from the third internal electrode 230 and then disposed on the third internal electrode 230. Here, the fourth internal electrode 240 may be disposed on a top surface of the stacked body 100. A cover layer (not shown) may be further disposed on the fourth internal electrode 240 to prevent the fourth internal electrode 240 from being exposed to the outside. the first The internal electrode may have one end side connected to the first external electrode 410 and the other end side spaced apart from the second external electrode 420, and the second internal electrode 220 may have one end side connected to the second external electrode 420 and the first electrode The other end side of an external electrode 410 spaced apart, the third internal electrode 230 may have one end side connected to the second external electrode 420 and the other end side spaced apart from the first external electrode 410, and the fourth internal electrode 240 may There is one end side connected to the first external electrode 410 and the other end side spaced from the second external electrode 420. Here, the electrostatic discharge protection part 1000 may be disposed between the first internal electrode 210 and the second internal electrode 220, and the capacitor part 2000 may be disposed between the third internal electrode 230 and the fourth internal electrode 240. In addition, the distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than the distance A1 from the end of the fourth internal electrode 240 to the third internal electrode 230 via the dielectric layer 300 and from the third internal electrode 230. Each of the end portions is at a distance A2 through the dielectric layer 300 to the fourth internal electrode 240. In addition, a distance B between the first and second internal electrodes 210 and 220 may be smaller than a distance C1 between the first and second internal electrodes 210 and 420 and between the second and second internal electrodes 220 and 410. The interval is between each of C2. That is, each of the distance A1, the distance A2, and the distance C1 may be greater than the distance B. Therefore, a short-circuit current supplied from the outside can flow to the electrostatic discharge protection portion 2000 between the first internal electrode 210 and the second internal electrode 220. Here, when the outer surface of the stacked body 100 is coated with an insulating material, each of the distances C1 and C2 may be smaller than the distance B, for example, may be in a range of 10 micrometers to 50 micrometers.

In another embodiment, as in another embodiment, the dielectric layer 300 may It is completely disposed in the longitudinal direction, and is therefore connected to the first and second external electrodes 410 and 420. Here, the area of the dielectric layer 300 may be smaller than the surface area of the stacked body 100.

FIG. 6 is a cross-sectional view of a composite protection device according to still another exemplary embodiment.

Referring to FIG. 6, a composite protection device according to still another embodiment includes: a stacked body 100 having a first dielectric constant; a first internal electrode 210 a and a first internal electrode 210 b on the stacked body 100 in a horizontal direction (X direction); Are separated from each other by a predetermined distance; the second internal electrode 220 is spaced apart from each of the first internal electrode 210a and the first internal electrode 210b in a vertical direction (i.e., the Z direction); the third internal electrode 230, in It is spaced from the second internal electrode 220 in the vertical direction; and the fourth internal electrode 240 is spaced from the third internal electrode 230 in the vertical direction. In addition, a dielectric layer 300 having a second dielectric constant larger than the first dielectric constant may be disposed between the third internal electrode 230 and the fourth internal electrode 240 to form the capacitor portion 2000, and may be located in the first internal portion. An electrostatic discharge protection part 1000 is disposed between each of the electrode 210a and the first internal electrode and the second internal electrode 220. Here, a part of the fourth internal electrode 240 and the dielectric layer 300 may be disposed on a surface of the stacked body 100. Alternatively, a cover layer may be further disposed on the fourth internal electrode 240, and thus the fourth internal electrode 240 may not be exposed.

The first and second internal electrodes 210a and 210b spaced apart from each other may be connected to the first and second external electrodes 410 and 420, respectively, and spaced a predetermined distance from a central portion within the stacked body 100. That is, the first internal electrode 210a may be connected to the first internal electrode 410, and the first internal electrode 210b may be connected to the second External electrode 420. Here, the separation distance D between the first internal electrode 210a and the first internal electrode 210b can be adjusted according to the length of the second internal electrode 220, and further, the interval between the first internal electrode 210a and the first internal electrode 210b The distance D may be larger or smaller than the length of each of the first and second internal electrodes 210a and 210b according to the length of the second internal electrode 220. In a composite protection device according to still another exemplary embodiment, the sum of the distance B1 and the distance B2 between the first internal electrode 210a and the first internal electrode 210b and the second internal electrode 220 spaced from each other in the horizontal direction ( B1 + B2) may be less than each of the following: the distance D between the first internal electrode 210a and the first internal electrode 210b, from the end of the fourth internal electrode 240 through the dielectric layer 300 to the third internal electrode The distance A1 of 230 and the distance A2 from the end of the third internal electrode 230 to the fourth internal electrode 240 via the dielectric layer 300. That is, the sum of the distance B1 and the distance B2 (B1 + B2) may be smaller than each of the distance D, the distance A1, and the distance A2. In addition, the vertical distance B1 and the vertical distance B2 (B1 + B2) of the first internal electrode 210a and the first internal electrode 210b and the second internal electrode 220 spaced apart from each other in the horizontal direction may be smaller than each of the following : The sum of the distance B1 between the first internal electrode 210a and the second internal electrode 220 and the distance F between the third internal electrode 230 and the second internal electrode 220 corresponding to the end of the dielectric layer 300 (B1 + F ); And the sum of the distance B2 between the first internal electrode 210b and the second internal electrode 220 and the distance E between the third internal electrode corresponding to the end of the dielectric layer 300 and the second internal electrode 220 (B2 + E). That is, the sum (B1 + B2) of the distance B1 and the distance B2 may be smaller than each of the sum of the distance B1 and the distance F (B1 + F) and the sum of the distance B2 and the distance E (B2 + E). In addition, distance A1 and distance A2 may be the same, and the length of each of the distance E and the distance F may be smaller than the length of each of the distance A1 and the distance A2. Therefore, an electric shock voltage such as an electrostatic discharge voltage may flow between the first internal electrode 210a and the second internal electrode 220.

FIG. 7 is a cross-sectional view of a composite protection device according to still another exemplary embodiment.

Referring to FIG. 7, a composite protective device according to this further embodiment includes: a stacked body 100 having a first dielectric constant; a first internal electrode 210 a and a first internal electrode 210 b spaced apart from each other in the stacked body 100 in a horizontal direction; A predetermined distance; the second internal electrode 220 is spaced apart from each of the first internal electrode 210a and the first internal electrode 210b in the vertical direction; the third internal electrode 230 is spaced from the second internal electrode 220 in the vertical direction The fourth internal electrode 240 is spaced apart from the third internal electrode 230 in the vertical direction; and the dielectric layer 300 is disposed between the third internal electrode 230 and the fourth internal electrode 240 and is completely formed in the longitudinal direction (that is, , X direction).

In a composite protection device according to still another exemplary embodiment, the sum of the distance B1 and the distance B2 between the first internal electrode 210a and the first internal electrode 210b and the second internal electrode 220 spaced from each other in the horizontal direction ( B1 + B2) may be smaller than each of the following: the separation distance D between the first internal electrode 210a and the first internal electrode 210b, from the end of the fourth internal electrode 240 to the second external electrode via the dielectric layer 300 The distance A1 of 420 and the distance A2 from the end of the third internal electrode 230 to the first external electrode 410 via the dielectric layer 300. That is, the sum of the distance B1 and the distance B2 (B1 + B2) may be smaller than each of the distance D, the distance A1, and the distance A2. In addition, the first internal electrode 210a and the first internal electrode 210a spaced apart from each other in the horizontal direction. The vertical distance B1 and the sum of the vertical distance B2 (B1 + B2) between the internal electrode 210b and the second internal electrode 220 may be less than each of the following: the distance between the first internal electrode 210a and the second internal electrode 220 B1 and the sum of the vertical distance G between the third internal electrode 230 and the second internal electrode 220 (B1 + G) and the distance B2 between the first internal electrode 210b and the second internal distance 220 and the fourth internal electrode 240 and The sum (B2 + H) of the shortest distance H between the contact area between the first external electrodes 410 and the second internal electrode 220. That is, the sum (B1 + B2) of the distance B1 and the distance B2 may be smaller than each of the sum of the distance B1 and the distance G (B1 + G) and the sum of the distance B2 and the distance H (B2 + H).

FIG. 8 is a sectional view of a composite protection device according to still another exemplary embodiment.

Referring to FIG. 8, a composite protection device according to this further exemplary embodiment may include: a stacked body 100 having a first dielectric constant; a plurality of internal electrodes 200 (internal electrode 210, internal electrode 220, and internal electrode 230), provided In the stacked body 100; a dielectric layer 300 is disposed inside the stacked body 100 and has a second dielectric constant larger than the first dielectric constant; and an external electrode 400 (external electrode 410 and external electrode 420) is disposed in the stacked body 100 is external and connected to the internal electrode 200; and a conductive layer 500 (the conductive layer 510 and the conductive layer 520) is located between the internal electrode 210 and the internal electrode 220 and the dielectric layer 300.

The dielectric layer 300 may be disposed between the first external electrode 410 and the second external electrode 420 in a longitudinal direction and has a predetermined thickness. Here, the length of the dielectric layer 300 may be greater than the thickness of the dielectric layer 300, or the thickness of the dielectric layer 300 may be greater than the length of the dielectric layer 300. In addition, they are placed on the upper part and the lower part of the dielectric layer 300, respectively. The length of the first conductive layer 510 and the second conductive layer 520 on the portion may be smaller than the length of the dielectric layer 300. Here, the distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than the distance I from the first conductive layer 510 along the surface of the dielectric layer 300 to the second conductive layer 220. That is, the length and thickness of the dielectric layer 300 can be adjusted so that the distance I between the conductive layer 500 and the dielectric layer 300 is greater than the distance B between the internal electrode 210 and the internal electrode 220. In addition, a distance B between the first and second internal electrodes 210 and 220 may be smaller than a distance C1 between the first and second internal electrodes 210 and 420 and between the second and second internal electrodes 220 and 410. Each of the distances C2.

FIG. 9 is a cross-sectional view of a composite protection device according to still another exemplary embodiment.

Referring to FIG. 9, a composite protection device according to this further exemplary embodiment may include: a stacked body 100 having a first dielectric constant; a plurality of internal electrodes 200 (internal electrode 210, internal electrode 220, and internal electrode 230), provided In the stacked body 100; a dielectric layer 300 (a dielectric layer 310 and a dielectric layer 320) is disposed inside the stacked body 100, and each of the dielectric layers 300 has a second dielectric having a larger dielectric constant than the first dielectric constant. The dielectric constants 300 are spaced a predetermined distance from each other in the horizontal direction; the external electrodes 400 (the external electrodes 410 and 420) are disposed outside the stacked body 100 and connected to the internal electrodes 200; and the conductive layers 500 ( The conductive layer 510, the conductive layer 520, the conductive layer 530, and the conductive layer 540) are located between the internal electrode 210 and the internal electrode 220 and the dielectric layer 300.

The dielectric layer 300 (the dielectric layer 310 and the dielectric layer 320) may be disposed between the first external electrode 410 and the second external electrode 420 in the longitudinal direction, and the dielectric layer 300 Each of them may have a predetermined thickness. Here, the length of each of the dielectric layers 300 may be greater than its thickness. In addition, each of the conductive layer 510, the conductive layer 520, the conductive layer 530, and the conductive layer 540 disposed on the upper and lower portions of the dielectric layer 300 may be longer than each of the dielectric layers 300, respectively. The length is small. Here, the distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than the distance from the conductive layer 510 and the conductive layer 530 along the surfaces of the dielectric layer 310 and the dielectric layer 320 to the conductive layer 520 and the conductive layer 540. Distance I1 and distance I2. In addition, the distance B between the first internal electrode 210 and the second internal electrode 220 may be smaller than the distance C1 between the first internal electrode 210 and the second external electrode 420 and between the second internal electrode 220 and the first external electrode 410. The distance C2.

In the composite protection device according to the embodiment, a dielectric layer having a second dielectric constant larger than the first dielectric constant may be formed in the stacked body having the first dielectric constant. Therefore, the breakdown voltage and capacitance of the composite protection device can be increased. That is, in the composite protection device according to the embodiment, although the breakdown voltage is increased, the capacitance may not be reduced, and thus an electric shock voltage may be blocked, and an electrostatic discharge voltage may be bypassed without disturbing a radio frequency signal.

The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments described herein. In contrast, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In addition, the present invention is defined only by the scope of the patent application.

100‧‧‧ stacked body

200, 210, 220, 230‧‧‧ internal electrodes

300‧‧‧ Dielectric layer

400, 410, 420‧‧‧ external electrodes

A1, A2, B, C‧‧‧ distance

1000‧‧‧ Electrostatic Discharge Protection Department

2000‧‧‧Capacitor Department

Claims (17)

A composite protection device includes: a stacked body in which a plurality of sheets are stacked; the plurality of internal electrodes are disposed in the stacked body; and a dielectric layer is disposed between the plurality of internal electrodes. At least a portion; and an external electrode disposed on two side surfaces of the stacked body facing each other, and the external electrode is connected to the plurality of internal electrodes, wherein a dielectric constant of the dielectric layer ( The dielectric constant is 2 to 300 times larger than the dielectric constant of the stacked body. The composite protection device according to item 1 of the scope of patent application, wherein the stacked body has a dielectric constant of 20 to 600, and the dielectric layer has a dielectric constant of 100 to 3000. The composite protection device according to item 1 of the patent application scope, wherein the stacked body is formed by using a varistor material. The composite protective device according to item 1 of the patent application scope, wherein the dielectric layer is formed by printing on a selected sheet or forming a block shape. The composite protection device according to item 1 of the patent application scope, wherein an opening is formed in a selected sheet of the stacked body, and the dielectric layer is disposed in the opening. The composite protection device according to item 1 of the scope of patent application, wherein the dielectric layer and the internal electrode in contact with the dielectric layer constitute a capacitor portion, and An electrostatic discharge protection portion is formed between the internal electrode of the capacitor portion and the internal electrode spaced from the internal electrode of the capacitor portion. The composite protection device according to item 6 of the scope of patent application, wherein the breakdown voltage of the electrostatic discharge protection portion is higher than the electric shock voltage and lower than the electrostatic discharge voltage. The composite protection device according to item 1 of the patent application scope, wherein the external electrodes further include a first external electrode and a second external electrode disposed on two side surfaces of the stacked body, wherein the plurality of internal electrodes The electrodes are spaced a predetermined distance from each other in the thickness direction of the stacked body, and the plurality of internal electrodes have some regions alternately connected to the first external electrode and the second external electrode and another spaced apart from each other. Some areas. The composite protection device according to item 8 of the patent application scope, wherein the internal electrode further includes a first internal electrode, a second internal electrode, and a third internal electrode spaced apart from each other, wherein the dielectric layer is partially exposed to Between the second internal electrode and the third internal electrode, and a distance between the first internal electrode and the second internal electrode is smaller than between the second internal electrode and the third internal electrode A distance along a surface of the dielectric layer, and the distance between the first internal electrode and the second internal electrode is less than a distance between the external electrodes spaced from the first internal electrode . The composite protection device according to item 8 of the scope of patent application, wherein the internal electrode further includes a first internal electrode, a second internal electrode, a first Three internal electrodes and a fourth internal electrode, wherein the dielectric layer is disposed between the third internal electrode and the fourth internal electrode, and between the first internal electrode and the second internal electrode An electrostatic discharge protection layer is disposed, and a distance between the first internal electrode and the second internal electrode is smaller than a distance between the third internal electrode and the fourth internal electrode along a surface of the dielectric layer. Distance, and the distance between the first internal electrode and the second internal electrode is smaller than the distance between the external electrode spaced from the first internal electrode and the second internal electrode. The composite protection device according to item 8 of the scope of patent application, wherein the internal electrode further includes a first internal electrode, a second internal electrode, a third internal electrode, and a fourth internal electrode spaced apart from each other, wherein the first The internal electrode has one end portion connected to each of the first external electrode and the second external electrode, and includes an electrode connected to the first external electrode and the second external electrode spaced apart from each other. At the other end of each, the dielectric layer is disposed between the third internal electrode and the fourth internal electrode, and is disposed between the first internal electrode and the second internal electrode. An electrostatic discharge protection portion, and each of the first internal electrode connected to the first external electrode and the first internal electrode connected to the second external electrode and the second internal electrode The sum of the distances between them is smaller than the distance between the first internal electrode connected to the first external electrode and the first internal electrode connected to the second external electrode. And a distance between the second internal electrode and each of the third internal electrode and the fourth internal electrode. The composite protection device according to item 8 of the scope of patent application, wherein at least one of the dielectric layers is disposed between the plurality of internal electrodes, and between the internal electrodes and the at least one dielectric layer is disposed At least one conductive layer. The composite protection device according to item 12 of the scope of the patent application, wherein a distance between the conductive layers along a surface of the dielectric layer is greater than a distance between the plurality of internal electrodes. The composite protection device according to item 1 of the scope of patent application, wherein at least a part of each of the external electrodes is formed by mixing glass and metal powder. The composite protection device according to item 1 of the patent application range, wherein each of the plurality of internal electrodes has a thickness of 1 to 10 micrometers, and each of the external electrodes has 2 to 100 micrometers Micrometer thickness. The composite protection device according to item 15 of the scope of patent application, wherein the external electrode further includes a nickel plating layer and a tin plating layer, and the nickel plating layer has a thickness of 1 to 10 microns, and the tin plating layer Has a thickness of 2 to 10 microns. An electronic device including a conductive body and an internal circuit capable of contacting a user, the electronic device includes: a composite protection device disposed between the conductive body and the internal circuit, wherein the composite protection device includes: A stacked body, in which a plurality of sheets are stacked in the stacked body; a plurality of internal electrodes are disposed in the stacked body; a capacitor portion includes a dielectric layer disposed on at least a portion between the plurality of internal electrodes And a protective portion disposed between the internal electrode of the capacitor portion and at least one internal electrode spaced from the internal electrode of the capacitor portion, wherein a dielectric constant of the dielectric layer (dielectric constant) ) Has a larger dielectric constant than the stacked body, a breakdown voltage of the protection portion is higher than an electric shock voltage and lower than an electrostatic discharge voltage, and the composite protection device is disposed on the metal of the internal circuit and the electronic device Between the housings to block the electric shock voltage and bypass the electrostatic discharge voltage.