WO2017135566A1 - Composite protection element and electronic device having same - Google Patents

Abstract

The present invention provides a composite protection element comprising: a laminate; a plurality of inner electrodes formed in the laminate; a dielectric layer arranged between at least two inner electrodes in the laminate; and outer electrodes formed on two opposite side surfaces of the laminate and connected to the inner electrodes, wherein the dielectric layer has dielectric permittivity higher than that of the laminate.

Description

Composite protection device and electronic device having same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite protection device, and more particularly, to a composite protection device capable of protecting an electronic device or a user from voltage and current.

The use of mobile communication terminal has evolved from the center of voice call to the convenience service of smartphone based life through data communication service. In addition, various frequency bands are used according to the multifunctionalization of smart phones and the like. That is, a plurality of functions using different frequency bands, such as wireless LAN, Bluetooth, and GPS, are adopted in one smartphone. In addition, due to the high integration of electronic devices, the internal circuit density in a limited space is increased, and noise interference between the internal circuits is inevitably generated. In order to suppress noise of various frequencies of a portable electronic device and to suppress noise between internal circuits, a plurality of circuit protection elements are used. For example, a capacitor, a chip bead, a common mode filter, and the like, which remove noise in different frequency bands, are used.

On the other hand, in recent years, with the emphasis on luxury image and durability of smart phones, the spread of terminals using metal materials is increasing. In other words, the spread of smart phones, which are made of metal with the edges or with the case made of metal other than the front screen display unit, is increasing.

However, using a smartphone during charging using a non-genuine charger in a smartphone using a metal case may cause an electric shock accident. That is, a shock current is generated by charging using a non-genuine charger or a poor charger using a low-quality device without built-in overcurrent protection circuit, and the shock current is conducted to the ground terminal of the smartphone, and again, a metal case The user who is in contact with the metal case may be electrocuted.

Varistors may be used to prevent such electric shocks. Varistors have a very high nonlinear current-voltage characteristic, which protects the circuit in the event of transient voltages. Varistors used as complex protection devices require breakdown voltages to be lower than the ESD voltage and higher than the electric shock voltage to protect the circuit from ESD voltages. That is, the breakdown voltage of the varistor must be lower than the ESD voltage and higher than the electric shock voltage, thereby blocking the electric shock voltage and bypassing the ESD voltage.

On the other hand, in order to realize the high breakdown voltage of the varistor, the thickness of the laminate sheet must be increased, in which case the capacitance is lowered. However, when the metal case of the electronic device is used as an antenna, the use of the composite protection device having a low capacitance may interfere with the RF signal, thereby reducing antenna sensitivity. In addition, the commercial varistor composition (Bi-based, Pr-based) has a low dielectric constant of the material, it is difficult to implement a varistor for a composite protection device without high breakdown voltage and RF signal interference.

(Prior art document)

Korea Patent Registration No. 10-0876206

The present invention provides a composite protection device that is provided in an electronic device such as a smart phone and can prevent the electric shock of the user by the electric shock voltage input from the charger.

The present invention provides a composite protective device using a varistor.

The present invention provides a composite protection device capable of increasing the breakdown voltage and at the same time increasing the capacitance.

A composite protective device according to an aspect of the present invention includes a laminate in which at least one sheet is laminated; A plurality of internal electrodes formed in the stack; A dielectric layer provided between at least two internal electrodes in the stack; And an external electrode formed on two opposite sides of the laminate and connected to the internal electrode, wherein the dielectric constant of the dielectric layer is higher than that of the laminate.

The dielectric constant of the dielectric layer is 2 to 300 times higher than that of the laminate.

The dielectric constant of the laminate is 20 to 600, and the dielectric constant of the dielectric layer is 100 to 3000.

The laminate is formed of a varistor material.

The dielectric layer is formed by printing on a selected sheet or formed into blocks.

An opening is formed in a selected sheet of the laminate and the dielectric layer is formed in the opening.

The dielectric layer and an inner electrode in contact with the dielectric layer form a capacitor portion, and an ESD protection portion is formed between the inner electrode of the capacitor portion and an inner electrode spaced therefrom.

The ESD protection part has a breakdown voltage higher than the electric shock voltage and lower than the ESD voltage.

The plurality of internal electrodes are formed to be spaced apart from each other by a predetermined interval in the thickness direction of the stack, and each of the internal electrodes is formed by alternately connecting one region with the first and second external electrodes and spaced from the other region.

And first, second, and third internal electrodes spaced apart from each other, wherein the dielectric layer is partially exposed between the second and third internal electrodes, and a distance between the first and second internal electrodes is greater than the dielectric layer. The distance between the second and third internal electrodes along the surface of is shorter, and the distance between the first and second internal electrodes is shorter than the distance between the first internal electrode and the external electrode spaced apart.

A first to fourth internal electrodes spaced apart from each other, the dielectric layer is formed between the third and fourth internal electrodes, an ESD protection part is formed between the first and second internal electrodes, and the first and second internal electrodes are formed. The distance between the second internal electrodes is shorter than the distance between the third and fourth internal electrodes along the surface of the dielectric layer, and the distance between the first and second internal electrodes is spaced apart from the first and second internal electrodes. Shorter than the distance between the external electrodes.

A first to fourth internal electrode spaced apart from each other, the first internal electrode including first and second internal electrodes having one end connected to the first and second external electrodes and the other end spaced apart from each other, and The dielectric layer is formed between the third and fourth internal electrodes, an ESD protection part is formed between the first and second internal electrodes, and the distance between each of the first and first internal electrodes and the second internal electrode. The sum is shorter than the distance between the first and first internal electrodes, and the distance beam between the second internal electrode and the third and fourth internal electrodes is short.

At least one dielectric layer is formed between the at least two internal electrodes, and at least one conductive layer is formed between the internal electrode and the dielectric layer.

The distance to the conductive layer along the surface of the dielectric layer is longer than the distance between the internal electrodes.

At least a portion of the external electrode is formed by mixing glass and metal powder.

The inner electrode is formed to a thickness of 1㎛ 10㎛, the outer electrode is formed to a thickness of 2㎛ 100㎛.

The external electrode further includes a Ni plating layer and a Sn plating layer, wherein the Ni plating layer is formed to a thickness of 1 μm to 10 μm, and the Sn plating layer is formed to a thickness of 2 μm to 10 μm.

An electronic device according to another aspect of the present invention is an electronic device including a conductor and an internal circuit that can be contacted by a user, the electronic device including a composite protection device provided between the conductor and the internal circuit, wherein the composite protection device is at least one A laminate in which sheets are stacked; A plurality of internal electrodes formed in the stack; A capacitor unit including a dielectric layer formed between at least two internal electrodes; And an ESD protection unit provided between the internal electrode of the capacitor unit and at least one internal electrode spaced apart from the internal electrode, wherein the dielectric constant of the dielectric layer is higher than the dielectric constant of the laminate, and the ESD protection unit is higher than the electric shock voltage and lower than the ESD voltage. A breakdown voltage is provided between the internal circuit of the electronic device and the metal case to block the electric shock voltage and bypass the ESD voltage.

In the composite protection device according to the embodiments of the present invention, a dielectric layer having a second dielectric constant higher than the first dielectric constant is formed in the laminate having the first dielectric constant. Therefore, it is possible to increase the capacitance while increasing the breakdown voltage of the composite protective element. That is, in the composite protection device of the present invention, the capacitance does not decrease even when the breakdown voltage is increased, thereby blocking the electric shock voltage and bypassing the ESD voltage without interfering with the RF signal.

1 is a perspective view of a composite protective device according to a first embodiment of the present invention.

2 and 3 are cross-sectional views of the composite protective device according to the first embodiment of the present invention.

4 to 9 are cross-sectional views of the composite protective device according to the second to seventh embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.

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

1 to 3, the composite protection device according to the first embodiment of the present invention includes a laminate 100 having a first dielectric constant, and a plurality of internal electrodes 210, 220, provided in the laminate 100. 230; 200, a dielectric layer 300 provided inside the laminate 100 and having a second dielectric constant higher than a first dielectric constant, and an external electrode provided outside the laminate 100 and connected to the internal electrode 200. 410, 420, and 400. Here, the ESD protection unit 1000 may be formed between at least two internal electrodes in the stack 100, for example, between the first and second internal electrodes 210 and 220, and the dielectric layer 300 may be interposed therebetween. At least two internal electrodes, for example, the second and third internal electrodes 220 and 230 may form the capacitor unit 2000. That is, the composite protection device according to an embodiment of the present invention includes an ESD protection part 1000 and a capacitor part 2000 having a higher dielectric constant than the ESD protection part 1000, and accordingly the capacitance ( capacitance) may increase. Such a composite protective element of the present invention is provided, for example, between a metal case of an electronic device and an internal circuit. Therefore, the electric shock voltage transmitted through the internal circuit to the metal case can be cut off and the ESD voltage transmitted from the outside to the internal circuit through the metal case can be bypassed. That is, the composite protection device of the present invention functions as an electric shock prevention device provided in an electronic device to block an electric shock voltage, and functions as a circuit protection device for bypassing an ESD voltage.

The laminate 100 may be formed by stacking a plurality of sheets. The sheet may have a substantially rectangular shape and may be provided in a plate shape having a predetermined thickness, and a plurality of such sheets may be stacked to form the laminate 100. Accordingly, the laminate 100 may have a hexahedral shape, and as shown in FIG. 1, the length of one direction (for example, the X direction) is greater than the length of the other direction (for example, the Y direction) orthogonal thereto. Long, the height in the Z direction is shorter than the length in the X direction and may be produced in the shape of a cube that is shorter, equal to or longer than the length in the Y direction. On the other hand, the plurality of sheets forming the laminate 100 may each have the same dielectric constant, for example, may have a dielectric constant of 10 to 600. Of course, the plurality of sheets may have different dielectric constants, and each sheet may have 10 to 600 even when having different dielectric constants. Here, the sheet may be made of a material having varistor properties. For example, the sheet may be manufactured using Pr-based, Bi-based, or ST-based ceramic materials. The laminate 100 may be formed using a material having diode characteristics. That is, the laminate 100 may be formed of a material having varistor characteristics or diode characteristics so that a current flows through the laminate 100 when a voltage equal to or higher than the breakdown voltage is applied. In addition, the laminate 100 may have an outer surface coated with an insulating material, for example, a glassy material. In this case, even when an insulating material is coated on the outside of the stack 100, the internal electrode 200 inside the stack 100 may be electrically connected to the external electrode 400.

A plurality of internal electrodes 210, 220, 230; 200 may be formed in the stack 100. For example, the first to third internal electrodes 210, 220, and 230 may be formed to be spaced apart from each other by the lower side of the stack 100. The plurality of internal electrodes 200 may be formed of a conductive material. For example, the plurality of internal electrodes 200 may be formed of a metal or a metal alloy including at least one of Ag, Au, Pt, Pd, Ni, and Cu. In addition, the internal electrode 200 may be formed to a thickness of 1㎛ 10㎛. Here, one side of the first internal electrode 210 is connected to the first external electrode 410 and the other side is spaced apart from the second external electrode 420, and the second internal electrode 220 has one side of the second external electrode ( 420, the other side of which is spaced apart from the first external electrode 410, and the third internal electrode 230 has one side connected to the first external electrode 410 and the other side spaced apart from the second external electrode 420. Can be. That is, the plurality of internal electrodes 200 may be alternately connected to the first and second external electrodes 410 and 420 in the vertical direction and spaced apart from the external electrodes 400 in the other side. The distance between the first and second internal electrodes 210 and 220 may be greater than the distance between the second and third internal electrodes 220 and 230. That is, at least one distance between the plurality of internal electrodes 200 may be different from at least one other. An ESD protection part 1000 is formed between the first and second internal electrodes 210 and 220, and a dielectric layer 300 is provided between the second and third internal electrodes 220 and 230 to provide the capacitor part 2000. Can be formed. In addition, the length in the horizontal direction of the first internal electrode 210 of the first and second external electrodes 410 and 420 is longer than the length in the horizontal direction of the second and third internal electrodes 220 and 230, and the first The width of the internal electrode 210 may be greater than or equal to the width of the second and third internal electrodes 220 and 230. Accordingly, an area of the first internal electrode 210 may be larger than that 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 and second internal electrodes 210 and 220. In this case, the first internal electrode 210 may be formed to have a length connected to the external electrode 400 while overlapping the dielectric layer 300. That is, the dielectric layer 300 is spaced apart from the external electrode 400 and is formed to have a predetermined length in the stack 100. The first internal electrode 210 overlaps all the regions of the dielectric layer 300 and one side thereof is the first. It may be formed to a length connected to the external electrode 410. Meanwhile, the second and third internal electrodes 220 and 230 may be formed to be spaced apart from each other with the dielectric layer 300 interposed therebetween, and may be formed so that at least a portion thereof does not overlap the dielectric layer 300. That is, the second internal electrode 220 is connected to the second external electrode 420 to be formed in the direction of the first external electrode 410, that is, in the X direction, with a part overlapping the dielectric layer 300 and the other part of the dielectric layer ( It may not overlap with 300). In addition, the third internal electrode 230 is connected to the first external electrode 410 and is formed in the direction of the second external electrode 420, that is, in the X direction, with a portion overlapping the dielectric layer 300 and a portion of the dielectric layer ( It may not overlap with 300). Thus, the lower side of the dielectric layer 300 may be exposed by the second external electrode 220, the upper side thereof may be exposed by the third external electrode 230, and different regions may be exposed. In addition, the exposed region of the dielectric layer 300 may be formed to have the same width on the second and third external electrodes 220 and 230. In this case, a length of a region that does not overlap the dielectric layers 300 of the second and third internal electrodes 220 and 230, that is, between the second and third internal electrodes 220 and 230 through the exposed dielectric layer 300, may be used. The shortest distance may be adjusted according to the distance between the first and second internal electrodes 210 and 220, and the distance between the first and second internal electrodes 210 and 220 may correspond to the second and third internal electrodes 220 and 220. It is formed to be shorter than the length of the region that does not overlap with the dielectric layer 300 of 230. That is, as shown in FIG. 2, the distance B between the first internal electrode 210 and the second internal electrode 220 passes through the dielectric layer 300 from the end of the third internal electrode 230 and passes through the second interior. The distance A1 to the electrode 220 and the distance A2 from the end of the second internal electrode 220 to the third internal electrode 230 through the dielectric layer 300 may be shorter. In addition, the widths of the second and third internal electrodes 220 and 230 may be smaller than the width of the dielectric layer 300. That is, as shown in FIG. 3, the second and third internal electrodes 220 and 230 are formed smaller than the width of the dielectric layer 300 at the center of the dielectric layer 300. In this case, as shown in FIG. 3, the distance B between the first internal electrode 210 and the second internal electrode 220 passes through the dielectric layer 300 from one end of the third internal electrode 230 and passes through the dielectric layer 300. Shorter than the distance A3 to one end of the internal electrode 220 and the distance A4 from the other end of the third internal electrode 230 to the other end of the second internal electrode 220 through the dielectric layer 300. Can be. That is, the ESD protection unit 1000 between the second internal electrode 220 and the first internal electrode 210 is not transmitted through the second and third internal electrodes 220 and 230 of the capacitor unit 2000. B may be formed shorter than A1 and A2 and A3 and A4 so as to be bypassed through). In addition, the distance (C) from the end of the first internal electrode 210 to the external electrode 400 should be longer than B. This is to prevent the ESD voltage from being transferred from the external electrode 400 through the first internal electrode 210. In the end, B should be shorter than A1, A2, A3, A4 and C. That is, since the ESD voltage is transmitted through the short conductive path, the distance between the ESD protection part 1000 and the capacitor part 2000 is equal to the dielectric layer of the capacitor part 2000 so that the ESD voltage is bypassed through the ESD protection part 1000. It should be shorter than the surface distance between 300 and internal electrodes 220, 230. On the other hand, when the outer surface of the laminate 100 is coated with an insulating material, the interval between the first inner electrode 210 and the outer electrode 400 may be shorter than B, 50㎛ or less, for example 10㎛-50 It may be formed in a micrometer.

The dielectric layer 300 may be formed to have a dielectric constant higher than that of the sheet of the laminate 100. For example, the dielectric layer 300 may have a dielectric constant 5 to 300 times higher than that of the sheet of the laminate 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, or after the predetermined region of the at least one sheet is removed, the dielectric layer 300 may be formed in a block shape. The dielectric layer 300 may be formed by printing a material having a higher dielectric constant than the laminate 100 in the form of a paste. For example, the dielectric layer 300 is formed of a material including at least one of a dielectric material powder such as MLCC, BaTiO ₃ , BaCO ₃ , TiO ₂ , Nd ₂ O ₃ , Bi ₂ O ₃ , Zn0, Al ₂ O ₃ Can be. In addition, when the dielectric layer 300 is inserted into a block, an opening having a predetermined size may be formed in the stack 100, and a block having a size corresponding to the opening may be formed and inserted into the opening. In this case, the block may be formed by cutting the sheet to a predetermined thickness. Meanwhile, the dielectric layer 300 may be formed to a thickness of 1 μm or more, for example, may be formed to a thickness of 0.5% to 50% of the thickness of the laminate 100. When the dielectric layer 300 is formed to be the same as or thicker than the thickness of one sheet constituting the laminate 100, the dielectric layer 300 may be formed by forming an opening having a predetermined size in at least one sheet and then printing a dielectric paste in the opening. It may be. 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 opening is formed in at least one sheet. In addition, the dielectric layer 300 may be formed in an area of 25% to 85% of the area of the stack 100 in the horizontal direction of the stack 100. In this case, when the dielectric layer 300 is formed using a material having a high dielectric constant, the thickness may be increased or the area may be reduced to increase the capacitance. When the dielectric layer 300 is formed using a material having a low dielectric constant, the dielectric layer 300 may have a thin thickness or an area. Can be formed to increase the capacitance. When the dielectric layer 300 is formed to have a thickness greater than or equal to the maximum value or less than the minimum value, the capacitance increase effect of the composite protection device may be insignificant, and when the dielectric layer 300 is formed to a thickness less than the minimum value, the capacitor portion 2000 of the composite protection device is formed. ) Is too thin to reduce the effect of blocking the short voltage, and if formed to exceed the maximum value of the area may cause a process failure such as cracks or delamination.

The external electrodes 410, 420 and 400 are provided on two opposite sides of the stack 100 to be selectively connected to the plurality of internal electrodes 200. That is, the external electrode 400 may include first and second external electrodes 410 and 420 formed on two side surfaces of the laminate 100 that face each other in the X direction. The external electrode 400 may be formed of at least one layer. The external electrode 400 may be formed of a metal layer such as Ag, and at least one plating layer may be formed on the metal layer. For example, the external electrode 400 may be formed by laminating a copper layer, a Ni plating layer, and a Sn plating layer. In addition, the external electrode 400 may be formed by mixing, for example, glass frit having a multi-component glass frit containing 0.5% to 20% of Bi ₂ O ₃ or SiO ₂ as a main component. In this case, the mixture of the glass frit and the metal powder may be prepared in a paste form and applied to two surfaces of the laminate 100. As the glass frit is included in the external electrode 400, the adhesion between the external electrode 400 and the stack 100 may be improved, and the contact reaction between the internal electrode 200 and the external electrode 400 may be improved. . In addition, after the conductive paste containing glass is applied, at least one plating layer may be formed on the upper portion thereof to form the external electrode 400. That is, the metal layer including the glass and at least one plating layer formed thereon may be formed to form the external electrode 400. For example, the external electrode 400 may sequentially form a Ni plating layer and a Sn plating layer through electrolytic or electroless plating after forming a layer including glass frit and at least one of Ag and Cu. In this case, the Sn plating layer may be formed to the same or thicker thickness than the Ni plating layer. Meanwhile, the external electrode 400 may be formed to a thickness of 2 μm to 100 μm, the Ni plating layer may be formed to a thickness of 1 μm to 10 μm, and the Sn plating layer may be formed to a thickness of 2 μm to 10 μm. .

On the other hand, in the composite protective element of the present invention, the length L in one direction, that is, the X direction is 0.3 mm to 1.1 mm, and the width W in the other direction or the Y direction, orthogonal thereto, is 0.15 mm to 0.55 mm. That is, the thickness in the Z direction may be 0.15 mm to 0.55 mm. For example, the composite protection element may have a length, a width, and a thickness of 0.9 mm to 1.1 mm, 0.45 mm to 0.55 mm, and 0.45 mm to 0.55 mm, respectively, 0.55 mm to 0.65 mm, 0.25 mm to 0.35 mm, and 0.25 mm, respectively. 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 protective element 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 × 0.5 mm × 0.5 mm, 0.6 mm × 0.3 mm × 0.3 mm, and 0.4 mm × 0.2 mm × 0.2 mm. That is, the composite protection element may have a length: width: thickness ratio of 2: 1: 1. The dimensions of these devices follow typical device specifications for SMT. In addition, the composite protective element of the present invention may have a capacitance of 2 to 150 mA.

As described above, in the composite protection device according to the exemplary embodiment, the dielectric layer 300 having a higher dielectric constant than the laminate 100 is formed in the laminate 100 formed of the varistor material. Thus, the overall capacitance can be increased while realizing the high breakdown voltage of the composite protection element. In this case, the rated voltage of the composite protection device may be, for example, 100V to 240V, and the breakdown voltage may be, for example, 320V or more. In addition, the electric shock voltage may be equal to or higher than the operating voltage of the circuit, and the ESD voltage generated by external static electricity may be higher than the breakdown voltage. Therefore, in the composite protection device of the present invention, current does not flow between the first and second external electrodes 410 and 420 at a rated voltage and an electric shock voltage, and a current is passed through the ESD protection unit 1000 at an ESD voltage higher than the breakdown voltage. Flows and is bypassed. Therefore, the ESD voltage applied from the outside to the internal circuit through the metal case is bypassed through the composite protection element, and the electric shock voltage applied from the internal circuit to the metal case is blocked through the composite protection element. At this time, the RF signal flows through the capacitor unit 2000. In addition, in the composite protection device according to the exemplary embodiment, the thickness of the ESD protection part 1000 is smaller than the distance between the internal electrodes 220 and 230 and the dielectric layer 300 of the capacitor part 2000. That is, the short current according to the electric shock voltage flows through a short portion of the conductive layer in the composite protection device, and the thickness of the ESD protection part 1000 is greater than that of the internal electrodes 220 and 230 of the capacitor part 2000 and the dielectric layer ( The short current flows to the ESD protection part 1000 because it is shorter than the distance between 300. As a result, the present invention can implement a high breakdown voltage without lowering the capacitance, and can function as a normal complex protection device by allowing the ESD voltage to be bypassed through the ESD protection unit 1000 even if the capacitance is increased. That is, the insulation resistance state can be maintained so that a leakage current does not flow when an electric shock voltage to the metal case is introduced from the internal circuit by the defective charger, and the ESD protection unit 1000 bypasses an ESD voltage higher than the electric shock voltage. High insulation resistance can be maintained without breakage. Therefore, it is possible to continuously prevent the electric shock voltage provided in the defective charger provided to the user through the metal case of the electronic device to be provided in the electronic device having the metal case and not be destroyed by the ESD voltage.

Meanwhile, the composite protection device of the present invention may be modified in various embodiments, and various embodiments of the present invention will be described below. In the following description, the content duplicated with the previous description will be omitted.

4 is a cross-sectional view of a composite protection device according to a second embodiment of the present invention.

Referring to FIG. 4, the composite protection device according to the second embodiment of the present invention may include a stack 100 having a first dielectric constant and a plurality of internal electrodes 210, 220, 230; 200 provided in the stack 100. ), A dielectric layer 300 provided inside the laminate 100 and having a second dielectric constant higher than a first dielectric constant, and external electrodes 410 provided outside the laminate 100 and connected to the internal electrodes 200. 420; 400). Here, the dielectric layer 300 may be formed as a whole in the length direction of the first and second external electrodes 410 and 420. That is, the dielectric layer 300 may have one end connected to the first external electrode 410 and the other end connected to the second external electrode 420. In addition, the dielectric layer 300 may be formed to the same size as the sheet constituting the laminate 100. That is, the dielectric layer 300 may be formed to have the same length as the laminate 100 in the X direction, and may be formed to have the same width or a different width as the laminate 100 in the Y direction. In this case, at least a portion of the dielectric layer 300 may not overlap the second and third internal electrodes 220 and 230. That is, the lower side of the dielectric layer 300 is in contact with one region of the stack 100 by the second internal electrode 220, and the upper side of the dielectric layer 300 is connected to the stack 100 by the third internal electrode 230. Contact with other areas of The composite protection device according to the second exemplary embodiment includes the distance A1 and the second internal electrode 220 from the end of the third internal electrode 230 to the second external electrode 420 along the surface of the dielectric layer 300. The distance A2 from the end of to the first external electrode 410 along the surface of the dielectric layer 300 is longer than the distance B between the first and second internal electrodes 210, 220. In addition, the distance B between the first and second internal electrodes 210 and 220 is shorter than the distance C between the end of the first internal electrode 210 and the second external electrode 420. Of course, when the outer surface of the laminate 100 is coated with an insulating material, the distance C between the first inner electrode 210 and the outer electrode 400 may be shorter than B, and may be 50 μm or less, for example, 10. It may be formed to a micrometer to 50㎛.

5 is a cross-sectional view of a composite protection device according to a third embodiment of the present invention.

Referring to FIG. 5, the composite protection device according to the third embodiment of the present invention may include a laminate 100 having a first dielectric constant, and a plurality of internal electrodes 210 and 220 formed on the inside and the surface of the laminate 100. , 230, 240; 200, a dielectric layer 300 provided on the upper side of the stack 100 and having a second dielectric constant higher than the first permittivity, and disposed outside the stack 100, and having an internal electrode 200. It may include an external electrode (410, 420; 400) to be connected. That is, in the composite protection device according to the third embodiment of the present invention, the capacitor part 2000 may be formed on one surface of the laminate 100, for example, the upper surface, in the Z direction, that is, in the thickness direction. In addition, the internal electrode 200 may include first to fourth internal electrodes 210, 220, 230, and 240. The ESD protection unit 1000 may be disposed between the first and second internal electrodes 210 and 220. The capacitor unit 2000 may be provided between the third and fourth internal electrodes 230 and 240.

The internal electrodes 210, 220, 230, and 240 may be provided in the stack 100, and a part thereof may be formed on the surface of the stack 100. That is, the first and second internal electrodes 210 and 220 are formed to be spaced apart from each other in the vertical direction by a predetermined interval in the stack 100, and are spaced apart from the second internal electrode 220 so as to form a third internal electrode on the upper portion thereof. 230 may be formed, and the fourth internal electrode 240 may be formed on the third internal electrode 230 and spaced apart from the third internal electrode 230. In this case, the fourth internal electrode 240 may be formed on the upper surface of the stack 100. Of course, a cover layer (not shown) may be further formed on the fourth internal electrode 240 so that the fourth internal electrode 240 may not be exposed to the outside. One side of the first internal electrode 210 is connected to the first external electrode 410, and the other side of the first internal electrode 210 is spaced apart from the second external electrode 420, and the second internal electrode 220 has one side of the second external electrode 410. And the other side is spaced apart from the first external electrode 420, and the third internal electrode 230 is connected at one side to the second external electrode 420 and the other side is spaced apart from the first external electrode 410. 4, the inner electrode 240 may have one side connected to the first external electrode 410 and the other side spaced apart from the second external electrode 420. Here, the ESD protection part 1000 may be formed between the first and second internal electrodes 210 and 220, and the capacitor part 2000 may be formed between the third and fourth internal electrodes 230 and 240. Can be. In addition, the distance B between the first and second internal electrodes 210 and 220 is a distance A1 from the end of the fourth internal electrode 240 to the third internal electrode 230 through the dielectric layer 300. And a distance A2 from the end of the third internal electrode 230 to the fourth internal electrode 240 through the dielectric layer 300. In addition, the distance B between the first and second internal electrodes 210 and 220 is a distance C1 between the first internal electrode 210 and the second external electrode 420 and the second internal electrode 220. It may be shorter than the separation distance C2 of the first external electrode 410. That is, A1, A2, C1 and C2 are formed longer than B. Therefore, the short current applied from the outside may flow to the ESD protection unit 2000 between the first and second internal electrodes 210 and 220. At this time, when the outer surface of the laminate 100 is coated with an insulating material, C1 and C2 may be shorter than B, for example, may be formed to 10㎛ ~ 50㎛.

Meanwhile, in the third exemplary embodiment of the present invention, like the second exemplary embodiment, the dielectric layer 300 may be formed in the longitudinal direction so as to be connected to the first and second external electrodes 410 and 420. In this case, the area of the dielectric layer 300 may be smaller than the surface area of the laminate 100.

6 is a cross-sectional view of a composite protection device according to a fourth embodiment of the present invention.

Referring to FIG. 6, the composite protection device according to the fourth exemplary embodiment may be spaced apart from the laminate 100 having the first dielectric constant in a horizontal direction (that is, in the X direction) inside the laminate 100. 1a and 1b internal electrodes 210a and 210b, and second internal electrodes 220 spaced apart from the 1a and 1b internal electrodes 210a and 210b in a vertical direction (ie, Z direction), And a third internal electrode 230 spaced apart from the second internal electrode 220 in a vertical direction, and a fourth internal electrode 240 spaced apart from the third internal electrode 230 in a vertical direction. In addition, a dielectric layer 300 having a second dielectric constant higher than the first dielectric constant is formed between the third and fourth internal electrodes 230 and 240 to form the capacitor part 2000, and to form the first and first internal electrodes 1a and 1b. An ESD protection unit 1000 is formed between the 210a and 210b and the second internal electrode 220. In this case, a portion of the fourth internal electrode 240 and the dielectric layer 300 may be formed on the surface of the stack 100. Of course, a cover layer may be further formed 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 220b spaced apart from each other may be connected to the first and second external electrodes 410 and 420, respectively, and may be formed to be spaced apart from each other at a central portion inside the stack 100. . That is, the first internal electrode 210a is connected to the first external electrode 410 and the first internal electrode 210b is connected to the second external electrode 420. In this case, the separation distance D between the first and first internal electrodes 210a and 220b may be adjusted according to the length of the second internal electrode 220. The first and first internal electrodes 210a and 220b may be adjusted. The separation distance D may be longer or shorter than the length of each of the first and first b internal electrodes 210a and 210b according to the length of the second internal electrode 220. In the composite protection device according to the fourth exemplary embodiment, the sum of the distances B1 and B2 between each of the first and first internal electrodes 210a and 210b and the second internal electrode 220 spaced apart in the horizontal direction. (B1 + B2) is shorter than the separation distance D of the first and first internal electrodes 210a and 210b, and the third internal electrode 230 is formed through the dielectric layer 300 from the end of the fourth internal electrode 240. It may be shorter than the distance A1 and the distance A2 from the end of the third internal electrode 230 to the fourth internal electrode 240 through the dielectric layer 300. That is, B1 + B2 may be smaller than D, A1, and A2. In addition, the sum B1 + B2 of the vertical distances B1 and B2 between each of the first and second internal electrodes 210a and 210b and the second internal electrode 220 spaced in the horizontal direction may correspond to the first a internal electrode ( The sum of the distance B1 between 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 distal end of the dielectric layer 300 ( B1 + F) and the third internal electrode 230 and the second internal electrode 220 corresponding to the distance B2 between the first internal electrode 210b and the second internal electrode 220 and the distal end of the dielectric layer 300. Is smaller than the sum (B2 + E) of the distances E). That is, B1 + B2 is smaller than B1 + F and B2 + E. In addition, A1 and A2 may be the same length, and the length of E and F may be shorter than A1 and A2. Therefore, an electric shock voltage such as an ESD voltage flows between the first internal electrode 210a and the second internal electrode 220.

7 is a cross-sectional view of a composite protection device according to a fifth embodiment of the present invention.

Referring to FIG. 7, the composite protection device according to the fifth embodiment of the present invention may include a stack 100 having a first dielectric constant and first and second gaps spaced apart from each other in a horizontal direction within the stack 100. 1b internal electrodes 210a and 210b, and second internal electrodes 220 disposed to be spaced apart from the first and second internal electrodes 210a and 210b in the vertical direction, and spaced apart from the second internal electrodes 220 in the vertical direction. The third internal electrode 230, the fourth internal electrode 240 provided to be spaced apart from the third internal electrode 230 in a vertical direction, and the third and fourth internal electrodes 230 and 240. It may include a dielectric layer 300 formed entirely in the longitudinal direction (ie, the X direction).

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

8 is a cross-sectional view of a composite protective device according to a sixth embodiment of the present invention.

Referring to FIG. 8, the composite protection device according to the sixth embodiment of the present invention may include a stack 100 having a first dielectric constant, a plurality of internal electrodes 210, 220, 200 provided in the stack 100, A dielectric layer 300 provided inside the laminate 100 and having a second dielectric constant higher than a first dielectric constant, and external electrodes 410 and 420 provided outside the laminate 100 and connected to the internal electrodes 200; 400, and conductive layers 510, 520; 500 provided between the internal electrodes 210 and 220 and the dielectric layer 300.

The dielectric layer 300 may be formed in a length direction between the first and second external electrodes 410 and 420, and may be formed to have a predetermined thickness. In this case, the length of the dielectric layer 300 may be greater than the thickness, or the thickness may be greater than the length. In addition, the first and second conductive layers 510 and 520 formed on and under the dielectric layer 300 may be formed to have a length shorter than the length of the dielectric layer 300. In this case, the distance B between the first and second internal electrodes 210 and 220 is a distance I from the first conductive layer 510 to the second conductive layer 520 along the surface of the dielectric layer 300. Can be shorter. That is, the length and thickness of the dielectric layer 300 may be adjusted such that the distance I between the conductive layer 500 and the dielectric layer 300 is longer than the distance B between the internal electrodes 210 and 220. In addition, the distance B between the first and second internal electrodes 210 and 220 may be a distance C1 between the first internal electrode 210 and the second external electrode 420 and the second internal electrode 220. And a distance C2 between the first external electrode 410 and the first external electrode 410.

9 is a cross-sectional view of a composite protective device according to a seventh embodiment of the present invention.

Referring to FIG. 9, the composite protection device according to the seventh embodiment of the present invention may include a laminate 100 having a first dielectric constant, a plurality of internal electrodes 210, 220; 200 provided in the laminate 100, and The dielectric layers 310, 320 and 300 provided inside the laminate 100 and having a second dielectric constant higher than the first dielectric constant and spaced apart by a predetermined interval in the horizontal direction are provided outside the laminate 100 and have internal electrodes 200. ) May include external electrodes 410, 420; 400, and conductive layers 510, 520, 530, 540; 500 provided between the internal electrodes 210, 220 and the dielectric layer 300.

The dielectric layers 310, 320; 300 may be formed in a length direction between the first and second external electrodes 410 and 420, and may be formed to have a predetermined thickness. In this case, the length of the dielectric layer 300 may be greater than the thickness. In addition, the conductive layers 510, 520, 530, and 540 formed on and under the dielectric layer 300 may have a length shorter than that of the dielectric layer 300. In this case, the distance B between the first and second internal electrodes 210 and 220 is a distance from the conductive layers 510 and 530 to the conductive layers 520 and 540 along the surfaces of the dielectric layers 310 and 320, respectively. It may be shorter than (I1, I2). In addition, the distance B between the first and second internal electrodes 210 and 220 may be a distance C1 between the first internal electrode 210 and the second external electrode 420 and the second internal electrode 220. And a distance C2 between the first external electrode 410 and the first external electrode 410.

The present invention is not limited to the above-described embodiments, but may be implemented in various forms. In other words, the above embodiments are provided to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and the scope of the present invention should be understood by the claims of the present application. .

Claims (18)

1. A laminate in which at least one sheet is laminated;

   A plurality of internal electrodes formed in the stack;

   A dielectric layer provided on at least a portion of the plurality of internal electrodes;

   It is formed on two opposite sides of the laminate and includes an external electrode connected to the internal electrode,

   And a dielectric constant of the dielectric layer is higher than that of the laminate.
2. The composite protective device of claim 1, wherein a dielectric constant of the dielectric layer is two to 300 times higher than that of the laminate.
3. The composite protective device of claim 2, wherein the laminate has a dielectric constant of 20 to 600 and a dielectric constant of 100 to 3000. 4.
4. The composite protective device of claim 1, wherein the laminate is formed of a varistor material.
5. The composite protective device of claim 1, wherein the dielectric layer is formed by printing on a selected sheet or formed as a block.
6. The composite protective element of claim 1, wherein an opening is formed in a selected sheet of the laminate and the dielectric layer is formed in the opening.
7. The composite protection device of claim 1, wherein the dielectric layer and the internal electrode in contact with the internal electrode form a capacitor portion, and the ESD protection portion is formed between the internal electrode and the internal electrode spaced apart from the capacitor portion.
8. The composite protection device of claim 7, wherein the ESD protection unit has a breakdown voltage higher than an electric shock voltage and lower than an ESD voltage.
9. The display apparatus of claim 1, further comprising first and second external electrodes provided on two side surfaces of the stack, wherein the plurality of inner electrodes are formed spaced apart from each other in a thickness direction of the stack, and each of the inner electrodes is one A composite protective device formed by alternately connecting a region to the first and second external electrodes and spacing another region.
10. The method of claim 9, further comprising first, second and third internal electrodes spaced apart from each other, wherein the dielectric layer is partially exposed between the second and third internal electrodes,

    The distance between the first and second internal electrodes is shorter than the distance between the second and third internal electrodes along the surface of the dielectric layer, and the distance between the first and second internal electrodes is equal to the first internal electrode and A composite protective element shorter than the distance between the spaced external electrodes.
11. The semiconductor device of claim 9, further comprising first to fourth internal electrodes spaced apart from each other, wherein the dielectric layer is formed between the third and fourth internal electrodes, and an ESD protection part is formed between the first and second internal electrodes. ,

    The distance between the first and second internal electrodes is shorter than the distance between the third and fourth internal electrodes along the surface of the dielectric layer, and the distance between the first and second internal electrodes is the first and second A composite protective element shorter than a distance between an inner electrode and the outer electrode spaced apart.
12. The method of claim 9, wherein the first internal electrodes include first to fourth internal electrodes spaced apart from each other, and the first internal electrodes have one end connected to the first and second external electrodes, respectively, and the other ends spaced apart from each other. An electrode, wherein the dielectric layer is formed between the third and fourth internal electrodes, an ESD protection part is formed between the first and second internal electrodes,

    The sum of the distances between each of the first internal electrodes and the first internal electrodes and the second internal electrodes is shorter than the distance between the first internal electrodes and the first internal electrodes, and between the second internal electrodes and the third and fourth internal electrodes. Composite protection element shorter than its distance.
13. The composite protective device of claim 9, wherein at least one dielectric layer is formed between the plurality of internal electrodes, and at least one conductive layer is formed between the internal electrode and the dielectric layer.
14. The composite protective device of claim 13, wherein a distance from the dielectric layer along the surface of the dielectric layer is longer than a distance between the internal electrodes.
15. The composite protective device of claim 1, wherein at least a portion of the external electrode is formed by mixing glass and a metal powder.
16. The composite protective device of claim 1, wherein the internal electrode is formed to a thickness of 1 μm to 10 μm, and the external electrode is formed to a thickness of 2 μm to 100 μm.
17. The composite protection of claim 16, wherein the external electrode further comprises a Ni plating layer and a Sn plating layer, wherein the Ni plating layer is formed to a thickness of 1 μm to 10 μm, and the Sn plating layer is formed to a thickness of 2 μm to 10 μm. device.
18. An electronic device comprising a conductor and an internal circuit that can be contacted by a user,

    Comprising a composite protection element provided between the conductor and the internal circuit,

    The composite protective element,

    A laminate in which at least one sheet is laminated;

    A plurality of internal electrodes formed in the stack;

    A capacitor part including a dielectric layer formed on at least a portion of the plurality of internal electrodes; And

    A protection part provided between the internal electrode of the capacitor part and at least one internal electrode spaced therefrom;

    The dielectric constant of the dielectric layer is higher than that of the laminate,

    The protection part has a breakdown voltage higher than the electric shock voltage and lower than the ESD voltage,

    An electronic device provided between an internal circuit of the electronic device and a metal case to block the electric shock voltage and bypass the ESD voltage.

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