TWI450642B - Circuit protection device - Google Patents

Description

Circuit protection device

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a circuit protection device and, more particularly, to a common mode noise filter and an electrostatic static discharge (hereinafter, referred to as "ESD"). The protective device is laminated to form a circuit protection device of a composite device.

Recently, electronic devices such as mobile phones, home appliances, PCs, PDAs, LCDs, and navigators have gradually digitized and operated at higher speeds. Such electronic devices are sensitive to external stimuli, and when small abnormal voltages and high frequency noise are introduced from the outside into the internal circuits of the electronic device, the circuits of the electronic devices may be damaged or the signals may be distorted.

The switching voltage generated in the circuit, the power noise contained in the power supply voltage, unnecessary electromagnetic signals, electromagnetic noise, and the like cause such abnormal voltage and noise. Filters are used to prevent such abnormal voltages and high frequency noise from being introduced into the components of the circuit.

In general differential signaling systems, passive components such as diodes and varistors should be used separately to prevent possible generation at the input/output terminals, in addition to common mode noise filters for eliminating common mode noise. ESD. If a separate passive component is used at the input/output terminal to solve the ESD, the mounting area is widened, the manufacturing cost is increased, and signal distortion or the like is generated.

For example, in order to use a varistor to prevent ESD, the varistor One end is connected to the input/output terminal, and the other end of the varistor is connected to the ground terminal to protect the electronic components in the electronic device. However, in the normal operating state of the electronic device, the varistor acts as a capacitor and a transient voltage is not applied to the capacitor. Since the capacitance of the capacitor changes at a higher frequency, when a varistor is used at a high frequency or high speed data input/output terminal or the like, signal distortion or the like may occur.

In addition, a rectangular hexahedron assembly is fabricated by laminating a common mode noise filter and a varistor. In this case, an external electrode connected to the common mode noise filter is formed on the first side surface of the rectangular hexahedron assembly and the second side surface opposite thereto. Further, an external electrode connected to the varistor is formed on the third side surface of the rectangular hexahedron assembly and the fourth side surface opposite thereto to be connected to the ground terminal. However, since the external electrode connected to the varistor is formed on the side surface of the rectangular hexahedral component, a parasitic capacitance of 1 picofarad or larger is generated between the common mode noise filter and the external electrode. Signals transmitted through a common mode noise filter may be distorted due to the parasitic capacitance.

It is an object of the present invention to provide a circuit protection device in which a common mode noise filter and an ESD protection device are implemented as a composite device.

Another object of the present invention is to provide a circuit protection device implemented as a composite device by laminating and compressing a common mode noise filter and an ESD protection device, the ESD protection device forming a predetermined hole on the insulating sheet And the hole is formed by filling the hole with an ESD protection material.

It is still another object of the present invention to provide a circuit protection device in which an external electrode connected to an ESD protection device is formed on a bottom surface of the composite device to be connected to a ground terminal, thereby reducing parasitic capacitance.

According to an aspect of the present invention, there is provided a circuit protection device comprising: a laminate laminated with a common mode noise filter and an ESD protection device; a first external electrode and a second external electrode, respectively formed in the One side surface and the other side surface of the laminate; and a third outer electrode formed on the top or bottom surface of the laminate.

The common mode noise filter may include a plurality of sheets, selectively forming internal electrodes exposed to the outside, coil patterns, and holes filled with a conductive material on the plurality of sheets.

A hole filled with a magnetic material may be selectively formed on each of the plurality of sheets.

The circuit protection device may further include at least one magnetic sheet formed on the common mode noise filter and between the common mode noise filter and the ESD protection device.

The ESD protection device may include a plurality of sheets, selectively forming internal electrodes exposed to the outside, holes filled with a conductive material, and holes filled with an ESD protection material on the plurality of sheets.

The ESD protective material may be formed of a mixture in which the organic material is mixed with at least one electrically conductive material selected from the group consisting of RuO ₂ , Pt, Pd, Ag, Au, Ni, Cr, and W.

Mixed with the mixture by a varistor material or an insulating ceramic material To get ESD protection materials.

The first external electrode can be connected to the common mode noise filter and the ESD protection device, the second external electrode can be connected to the common mode noise filter, and the third external electrode can be connected to the ESD protection device.

The first external electrode and the second external electrode may be connected to the input/output terminal and the circuit, and the third external electrode may be connected to the ground terminal.

The first external electrode may be connected to the internal electrode exposed at one side of the common mode noise filter and the internal electrode of the ESD protection device, and the second external electrode may be connected to be exposed on the other side of the common mode noise filter Internal electrode.

The third outer electrode can be connected to a hole of the ESD protection device, wherein the hole is filled with a conductive material.

The ESD protection device may include: a first sheet having a plurality of first holes filled with an ESD protection material, and a plurality of first internal electrodes connected to the first holes and exposed to an outer side thereof; a second sheet having a plurality of holes filled with a conductive material, and a plurality of internal electrodes connected to the plurality of holes and the holes of the first sheet; and a third sheet having a shape corresponding to the second sheet a plurality of holes at positions of the plurality of holes, wherein the holes are filled with a conductive material; and a fourth sheet having a third external electrode formed at a position corresponding to the plurality of holes of the third sheet, wherein The third external electrode is formed by filling a hole with a conductive material.

The first sheet may further include: forming a plurality of second holes spaced apart from the plurality of first holes, wherein the second holes are filled with an ESD protection material; and a plurality of second internal electrodes connected to the plurality of second Hole and exposed to the other Outside.

The fourth sheet may be a magnetic sheet.

The third external electrode may include one or more third external electrodes.

The parasitic capacitance between the common mode noise filter and the ESD protection device can be less than 1 picofarad.

According to the present invention, the circuit protection device is formed as a device by a common mode noise filter and an ESD protection device stack, and the circuit protection device is disposed at an input/output terminal of the circuit and the electronic device of the electronic device. In the meantime, a single-chip device can be used to simultaneously prevent common mode noise and ESD of the electronic device. Therefore, the circuit protection device is manufactured in a single-wafer form with a tight configuration compared to the conventional technique of using a discrete device to prevent common mode noise and ESD, so that the size of the electronic device can be prevented from increasing, and the installation area can be remarkable. It is reduced, and the reliability of the electronic device can be enhanced by using a low-capacity ESD protection device to prevent input/output signal distortion.

In addition, an external electrode connected to the ESD protection device is formed on the bottom surface of the composite device to lengthen the distance between the common mode noise filter and the ESD protection device, thereby reducing parasitic capacitance. Therefore, distortion of the signal can be prevented, thereby enhancing reliability.

The above described features and advantages of the present invention will be more apparent from the following description.

Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. Example. However, the invention is not limited to the embodiments disclosed below, but may be embodied in different forms. These embodiments are provided for illustrative purposes only and are intended to provide a comprehensive understanding of the scope of the invention. In the drawings, the thickness of layers and regions are inferred, and the same reference numerals are used throughout the description and the drawings. In addition, the expression of an element such as a layer, region, substrate, or plate placed on or over another element refers not only to the case where the element is placed directly on or over the other element, but also A further element is inserted between the element and the other element.

1 is a top perspective view showing an assembled state of a circuit protection device according to the present invention, FIG. 2 is a bottom perspective view showing an assembled state of the circuit protection device, and FIG. 3 is an exploded perspective view of the circuit protection device. And FIG. 4 is an equivalent circuit diagram of the circuit protection device.

Referring to Figures 1, 2 and 3, a circuit protection device 10 according to an embodiment of the present invention includes a common mode noise filter 100 and an ESD protection device 200 which are constructed by laminating a plurality of sheets. The circuit protection device 10 further includes an upper cover layer 300 mounted on top of the common mode noise filter 100. The circuit protection device 10 may further include: a plurality of first external electrodes 500 (510, 520, 530, and 540) formed on one side of the circuit protection device 10 to be connected to one side of the common mode noise filter 100 Internal electrodes and internal electrodes of the ESD protection device 200; a plurality of second external electrodes 600 (610, 620, 630, and 640) formed on the other side of the circuit protection device 10 to be connected to the common mode noise filter An internal electrode at the other side of 100; and a plurality of third external electrodes 700 (710, 720, 730) And 740) formed to be exposed to a bottom surface of the circuit protection device 10. Here, the third external electrode 700 may be formed as part of the ESD protection device 200.

The common mode noise filter 100 is composed by laminating a plurality of sheets 110, 120, 130, 140, 150, 160, 170, and 180 on which internal electrodes, coil patterns, and holes are selectively formed. The plurality of sheets 110, 120, 130, 140, 150, 160, 170, and 180 are formed in a rectangular shape, for example, having two long sides and two short sides. A first insulating sheet 410 and a first magnetic sheet 420 may be provided between the upper cover layer 300 and the first sheet 110; a second magnetic sheet 430 and a second insulating sheet may be provided between the fourth sheet 140 and the fifth sheet 150. 440 and a third magnetic sheet 450; and a fourth magnetic sheet 460 may be provided under the eighth sheet 180.

The hole 111 and the internal electrode 112 are formed on the top surface of the first sheet 110. The hole 111 is formed near the center of the first sheet 110. For example, the aperture 111 is formed on a centerline that defines the imaginary line that is parallel to the long side and connects the centers of the opposite short sides. Moreover, a hole 111 is formed on the center line to be spaced apart from the first short side of the first sheet 110 by a predetermined distance. For example, the hole 111 is formed on the center line at a point one-fifth from the first short side of the first sheet 110. In addition, the internal electrode 112 is formed to extend from the hole 111 to be exposed at a predetermined position of the first long side of the first sheet 110. For example, the inner electrode 112 is formed to be exposed on the first long side from the first short side of the first sheet 110 to one eighth of the second short side.

The internal electrode 122 and the coil pattern 123 are formed on the second sheet 120 On the top surface. The inner electrode 122 is formed to be exposed at a second long side of the second sheet 120 opposite the first long side of the first sheet 110 where the inner electrode 112 of the first sheet 110 is exposed. For example, the inner electrode 122 is formed to be exposed on the second long side from the first short side of the first sheet 120 to an eighth point of the second short side. That is, the internal electrode 122 on the second sheet 120 is formed with respect to the internal electrode 112 on the first sheet 110. The coil pattern 123 is connected to the internal electrode 122, and is formed in a spiral shape to extend upward to a position corresponding to the hole 111 of the first sheet 110. The coil pattern 123 of the second sheet 120 is connected to the internal electrode 112 of the first sheet 110 through the hole 111 of the first sheet 110. Therefore, the internal electrode 112 of the first sheet 110 is connected to the coil pattern 123 and the internal electrode 122 of the second sheet 120 through the hole 111 of the first sheet 110.

The internal electrode 132 and the coil pattern 133 are formed on the bottom surface of the third sheet 130. The internal electrode 132 is formed to be exposed at a second long side corresponding to the second long side of the internal electrode 122 on which the second sheet 120 is formed. For example, the inner electrode 132 is formed to be exposed on the second long side from the first short side of the third sheet 130 to three-eighths of the second short side. The coil pattern 133 is connected to the internal electrode 132, and is formed in a spiral shape to extend upward to a position corresponding to the hole 111 of the first sheet 110.

The hole 141 and the inner electrode 142 are formed on the bottom surface of the fourth sheet 140. A hole 141 is formed at a region corresponding to the hole 111 of the first sheet 110. That is, the hole 141 is formed on the center line, which is defined as a line parallel to the long side and connecting the centers of the opposite short sides. For example, the hole 141 is formed on the center line and starts from the first short side of the first sheet 140. One point. The inner electrode 142 is formed to extend from the hole 141 to be exposed at a predetermined position of the first long side of the fourth sheet 140. For example, the inner electrode 142 is formed to be exposed on the first long side from the first short side of the fourth sheet 140 to three-eighths of the second short side. That is, the inner electrode 142 of the fourth sheet 140 is formed on the first long side of the fourth sheet 140 opposite to the position corresponding to the inner electrode 132 of the third sheet 130. The coil pattern 133 of the third sheet 130 is connected to the internal electrode 142 of the fourth sheet 140 through the hole 141 of the fourth sheet 140. Therefore, the internal electrode 142 of the fourth sheet 140 is connected to the coil pattern 133 and the internal electrode 132 of the third sheet 130 through the hole 141 of the fourth sheet 140.

A hole 151 and an internal electrode 152 are formed on the top surface of the fifth sheet 150. A hole 151 is formed near the center of the fifth sheet 150. For example, the aperture 151 is formed on the centerline, defining the centerline as an imaginary line that is parallel to the long side and connects the centers of the opposing short sides. Moreover, a hole 151 is formed on the center line to be spaced apart from the second short side of the fifth sheet 150 by a predetermined distance. For example, the aperture 151 is formed on the centerline at a one-fifth point from the second short side of the first sheet 150. In addition, the internal electrode 152 is formed to extend from the hole 151 to be exposed at a predetermined position of the second long side of the fifth sheet 150. For example, the inner electrode 152 is formed to be exposed on the second long side from the second short side of the fifth sheet 150 to one eighth of the first short side.

The inner electrode 162 and the coil pattern 163 are formed on the top surface of the sixth sheet 160. The inner electrode 162 is formed to be exposed at a first long side of the sixth sheet 160 opposite to the first long side of the fifth sheet 150 where the inner electrode 152 of the fifth sheet 150 is exposed. For example, internal electrode 162 It is formed to be exposed on the first long side from the second short side of the sixth sheet 160 to one eighth of the first short side. That is, the internal electrode 162 on the sixth sheet 160 is formed with respect to the internal electrode 152 on the fifth sheet 150. The coil pattern 163 is connected to the internal electrode 162, and is formed in a spiral shape to extend upward to a position corresponding to the hole 151 of the fifth sheet 150. The coil pattern 163 of the sixth sheet 160 is connected to the internal electrode 152 of the fifth sheet 150 through the hole 151 of the fifth sheet 150. Therefore, the internal electrode 152 of the fifth sheet 150 is connected to the coil pattern 163 and the internal electrode 162 of the sixth sheet 160 through the hole 151 of the fifth sheet 150.

The internal electrode 172 and the coil pattern 173 are formed on the bottom surface of the seventh sheet 170. The internal electrode 172 is formed to be exposed at a first long side corresponding to the first long side of the internal electrode 162 on which the sixth sheet 160 is formed. For example, the inner electrode 172 is formed to be exposed on the first long side from the second short side of the seventh sheet 170 to three-eighths of the first short side. The coil pattern 173 is connected to the internal electrode 172, and is formed in a spiral shape to extend upward to a position corresponding to the hole 151 of the fifth sheet 150.

A hole 181 and an internal electrode 182 are formed on the bottom surface of the eighth sheet 180. A hole 181 is formed at a region corresponding to the hole 151 of the fifth sheet 150. That is, the hole 181 is formed on the center line, which is defined as a line parallel to the long side and connecting the centers of the opposite short sides. For example, the aperture 181 is formed on the centerline at a fifth of the point from the second short side of the eighth sheet 180. The inner electrode 182 is formed to extend from the hole 181 to be exposed at a predetermined position of the second long side of the eighth sheet 180. For example, the inner electrode 182 is formed to be on the second long side from the eighth sheet 180 The short side is exposed to three-eighths of the first short side. That is, the inner electrode 182 of the eighth sheet 180 is formed on the second long side of the eighth sheet 180 opposite to the position corresponding to the inner electrode 172 of the seventh sheet 170. The coil pattern 173 of the seventh sheet 170 is connected to the internal electrode 182 of the eighth sheet 180 through the hole 181 of the eighth sheet 180. Therefore, the internal electrode 182 of the eighth sheet 180 is connected to the coil pattern 173 and the internal electrode 172 of the seventh sheet 170 through the hole 181 of the eighth sheet 180.

Here, the holes 111, 141, 151, and 181 are filled with a conductive paste. The internal electrodes 112, 122, 132, 142, 152, 162, 172, and 182 and the coil patterns 123, 133, 163, and 173 are formed of a conductive paste by screen printing, sputtering, evaporation, or sol-gel coating methods.

a first insulating sheet 410 and a first magnetic sheet 420 disposed between the upper cover layer 300 and the first sheet 110, and a second magnetic sheet 430 and a second insulating sheet disposed between the fourth sheet 140 and the fifth sheet 150 Each of the 440 and the third magnetic sheets 450 and the fourth magnetic sheets 460 disposed under the eighth sheet 180 may be thicker than the first sheet to the fourth layer selectively forming the holes, the internal electrodes, and the coil patterns The sum of the thicknesses of the sheets 110, 120, 130, and 140, or the sum of the thicknesses of the fifth to eighth sheets 150, 160, 170, and 180.

The ESD protection device 200 is composed by laminating the first to fourth sheets 210, 220, 230, and 240 on which the internal electrodes and the holes are selectively formed.

The first to fourth holes 211, 212, 213, and 214 and the first to fourth internal electrodes 215, 216, 217, and 218 are formed in the first thin On the top surface of the sheet 210. The first to fourth holes 211, 212, 213, and 214 are formed at the central portion of the first sheet 210 and are spaced apart from each other by a predetermined distance. The first to fourth holes 211, 212, 213, and 214 are formed to have a width of several micrometers (um) to several hundred micrometers. For example, the first to fourth holes 211, 212, 213, and 214 are respectively formed at an eighth point, eight points on a line connecting the quarter points on the relatively short sides of the first sheet 210. Three points, five-eighths and seven-eighths. The first to fourth internal electrodes 215, 216, 217, and 218 are formed to be exposed at the second long side of the first sheet 210. The first to fourth inner electrodes 215, 216, 217, and 218 are formed in a shape having a straight line of a predetermined width to be connected to the first to fourth holes 211, 212, 213, and 214, respectively.

The first to fourth holes 221, 222, 223, and 224 and the first to fourth internal electrodes 225, 226, 227, and 228 are formed on the top surface of the second sheet 220. The first to fourth holes 221, 222, 223, and 224 are respectively formed at one-eighth, three-eighth, five-eighth, and eight of the lines connecting the centers of the relatively short sides of the second sheet 220. At seven points. In addition, the first to fourth inner electrodes 225, 226, 227, and 228 are formed to be spaced apart from the second long side of the second sheet 220 by a predetermined distance so as not to be exposed at the second long side of the second sheet 220. For example, the first to fourth internal electrodes 225, 226, 227, and 228 are formed to extend from positions corresponding to the first to fourth holes 211, 212, 213, and 214 of the first sheet 210 to Connected to the first to fourth holes 221, 222, 223, and 224, respectively. Here, the first hole to the fourth hole 211, 212, 213 and 214 of the first sheet 210 and the first hole of the second sheet 220 to the first The four holes 221, 222, 223, and 224 are not formed at the same position, but are formed to be offset from each other.

The first to fourth holes 231, 232, 233, and 234 are formed on the third sheet 230. The first and fourth holes 231, 232, 233, and 234 are formed at positions corresponding to the first to fourth holes 221, 222, 223, and 224 of the second sheet 220, respectively. The first to fourth holes 231, 232, 233, and 234 may be formed to have the same size.

The first to fourth holes 241, 242, 243, and 244 are respectively formed on the fourth sheet 240 at positions corresponding to the first to fourth holes 231, 232, 233, and 234 of the third sheet 230 to have equal Or a size larger than the size of the first to fourth holes 231, 232, 233, and 234. Each of the first to fourth holes 241, 242, 243, and 244 is filled with a conductive paste serving as the third external electrodes 710, 720, 730, and 740 to be connected to the ground terminal. The fourth sheet 240 may be formed to be thicker than the sum of the thicknesses of the first to third sheets 210, 220, and 230. The fourth sheet 240 may be formed of a magnetic material.

Here, the holes 211, 212, 213, and 214 of the first sheet 210 are filled with an ESD protection material. The ESD protective material may comprise a mixture in which an organic material such as polyvinyl alcohol (PVA) or polyvinyl butyral (PVB) is combined with RuO ₂ , Pt, Pd, Ag, Au. At least one electrically conductive material of Ni, Cr, W, and the like is mixed. In addition, the ESD protection material can be obtained by further mixing a varistor material such as ZnO or an insulating ceramic material such as Al ₂ O ₃ with the mixture. Further, the holes 221, 222, 223, and 224 of the second sheet 220, the holes 231, 232, 233, and 234 of the third sheet 230, and the holes 241, 242, 243, and 244 of the fourth sheet 240 are filled with a conductive paste. The internal electrodes 215, 216, 217 and 218 of the first sheet 210 and the internal electrodes 225, 226, 227 and 228 of the second sheet 220 are electrically conductive by screen printing, sputtering, evaporation or sol-gel coating methods. The cream is formed. The first to fourth internal electrodes 215, 216, 217, and 218 of the first sheet 210 are formed to cover the first to fourth holes 211, 212, 213, and 214 filled with the ESD protection material.

As described above, in the common mode noise filter 100 of the circuit protection device according to the present invention, the magnetic sheets 420, 430, 440, 450, and 460 are formed on the first sheet 110, the fourth sheet 140, and the fifth, respectively. Between the sheets 150 and under the eighth sheet 180, leakage of magnetic flux is prevented. The third external electrode 700 of the ESD protection device 200 is formed on the bottom surface of the circuit protection device 10 to be connected to the internal electrode exposed to the bottom surface of the circuit protection device 10, so that the external electrode 700 of the ESD protection device is formed in the circuit protection. Compared to the case on the side surface of the device 10, the parasitic capacitance can be significantly reduced, thereby enhancing reliability. That is, as the distance between the coil pattern of the common mode noise filter 100 and the external electrodes of the ESD protection device 200 increases, the parasitic capacitance decreases. In the present invention, the coil pattern of the common mode noise filter 100 and the ESD protection device 200 are compared with the case where the external electrode 700 of the ESD protection device 200 is formed from one side surface of the circuit protection device 10 to the other side surface. The distance between the external electrodes is long. Therefore, in the circuit protection device, the capacitance does not change at the input/output terminal using the higher frequency, or the signal caused by the capacitance change Distortion does not occur.

As described above, in the circuit protection device 10 implemented as a composite device of the common mode noise filter 100 and the ESD protection device 200 according to an embodiment of the present invention, the first external electrode 500 and the second external electrode 600 are connected to the system. And a dual channel input/output terminal (which is used in an electronic device), and the third external electrode 700 is connected to the ground terminal, so that the circuit protection device can remove the common mode noise and allow static electricity introduced into the input/output terminal Flow into the ground terminal as shown in the equivalent circuit of Figure 4.

That is, the common mode noise filter 100 acts as an inductor to prevent common mode noise. If an undesired voltage higher than a predetermined value is applied to both ends of the circuit protection device 10, a discharge is generated between the conductive particles of the ESD protection material, and a current flows into the ground terminal, thereby reducing the corresponding circuit protection device 10. The voltage difference between the two ends. At this time, since both ends of the circuit protection device 10 are not electrically connected to each other, the input signal is transmitted to the input/output terminal as it is without distortion. That is, even when static electricity is generated, the corresponding electrostatic discharge is discharged to the ground terminal by the corresponding protection circuit device, so that the circuit protection device 10 protects the circuit and allows the signal received and transmitted by the system to remain intact.

In addition, a circuit protection device can be used to prevent common mode noise and ESD input through many channels (although the number of channels is increased), so that the number of circuit protection devices can be reduced, and thus, the size of the electronic device can be reduced. .

In addition, since the parasitic capacitance between the common mode noise filter 100 and the ESD protection device 200 can be significantly reduced, it is prevented from passing through the common mode. The distortion of the signal transmitted by the noise filter 100 enhances reliability.

Hereinafter, a method of manufacturing the aforementioned circuit protection device formed by laminating a common mode noise filter and an ESD protection device according to an embodiment of the present invention will be described with reference to FIG.

S110: preparing a plurality of rectangular sheets in which a non-magnetic material is mixed and a plurality of rectangular sheets in which a magnetic material is mixed. In order to form a sheet in which a non-magnetic material is mixed, a non-magnetic material (including a glass based on B ₂ O ₃ -SiO ₂ , based on Al ₂ O ₃ -) having a coefficient of thermal expansion similar to that of ferrite iron (including B ₂ O ₃ -SiO ₂ - The SiO ₂ glass and other ceramic materials are mixed with a composition containing Al ₂ O ₃ , glass frit, and the like, and the mixture is subjected to ball milling for 24 hours with a solvent such as ethanol to prepare a raw material powder. Moreover, in order to form a sheet in which a magnetic material is mixed, by using, for example, ferrite iron, a material based on Ni, a material based on Ni-Zn, and a material based on Ni-Zn-Cu, and containing Al ₂ O ₃ , glass frit and The composition of the analog is mixed, and the mixture is subjected to ball milling with a solvent such as ethanol for 24 hours to prepare a raw material powder. Next, by measuring about 6 weight percent of the organic binder relative to the raw material powder as an additive, dissolving the organic binder in a solvent based on toluene/ethanol, inputting the additive into the raw material powder, and using A pellet mill was used to grind and mix the raw material powder with the additive for 24 hours to prepare a slurry. Thereafter, a sheet having a desired thickness is produced, for example, by a doctor blade method or the like.

S120: forming a hole at a predetermined region selected from a sheet mixed with a non-magnetic material. That is, the holes 111, 141, 151, and 181 are formed in the first sheet 110, the fourth sheet 140, and the fifth of the common mode noise filter 100, respectively. On the sheet 150 and the eighth sheet 180, a plurality of holes are formed in the first to fourth sheets 210, 220, 230, and 240 of the ESD protection device 200. These holes are formed in a number of micrometers (um) using a laser or mechanical perforation method.

S130: holes 111, 141, 151, and 181 respectively formed on the first sheet 110, the fourth sheet 140, the fifth sheet 150, and the eighth sheet 180 for the common mode noise filter 100, and are formed for The holes on the second to fourth sheets 220, 230, and 240 of the ESD protection device 200 are filled with a conductive paste such as Pd, Ag/Pd, or Ag. The holes formed in the first sheet 210 for the ESD protection device 200 are filled with an ESD protection material. The ESD protective material may be formed of a material containing an organic material such as polyvinyl alcohol (PVA) or polyvinyl butyral (PVB) and such as RuO ₂ , Pt, Pd, Ag, Au, Ni, At least one electrically conductive material of Cr, W, and the like is mixed. Meanwhile, the ESD protection material can be obtained by further mixing with the mixture using a varistor material such as ZnO or an insulating ceramic material such as Al ₂ O ₃ . Alternatively, various ESD protection materials can be used.

S140: Forming internal electrodes and coil patterns on the sheets selected to form the common mode noise filter 100, and forming internal electrodes on the sheets selected to constitute the ESD protection device 200. That is, in order to form the common mode noise filter 100, internal electrodes are formed on the first sheet 110, the fourth sheet 140, the fifth sheet 150, and the eighth sheet 180, and internal electrodes and coil patterns are formed on the second sheet 120. On the third sheet 130, the sixth sheet 160, and the seventh sheet 170. In order to constitute the ESD protection device 200, The partial electrodes are formed on the first sheet 210 and the second sheet 220. These internal electrodes and coil patterns are printed with a conductive paste such as Pd, Ag/Pd or Ag by a screen printing method or the like.

S150: manufacturing a rectangular hexahedron laminate by laminating a magnetic sheet, an insulating sheet, and a sheet having predetermined internal electrodes, coil patterns and holes formed thereon; compressing at a pressure of 200 to 700 kgf/cm 2 The laminated sheet; and then the laminate is cut into unit wafers of the desired size.

S160: Subsequently, the sheet laminate is fired in an oven at a temperature of 230 ° C to 350 ° C for 20 to 40 hours to remove the binder component, and then at a temperature of 700 ° C to 900 ° C Sintering for 20 to 40 hours.

S170: forming a first external electrode 500 and a second external electrode 600 on one outer surface and the other outer surface of the sheet laminate sintered in the furnace, and then sintering the first external electrode at a temperature of 600 ° C to 800 ° C The 500 and the second external electrode 600 last for 30 minutes to 2 hours to complete the circuit protection device according to an embodiment of the present invention. Here, the first external electrode 500 is formed to be connected to the internal electrodes 122, 132, 152, and 182 of the common mode noise filter 100 and the internal electrodes 215, 216, 217, and 218 of the ESD protection device 200. The second external electrode 600 is formed to be connected to the internal electrodes 121, 124, 152, and 172 of the common mode noise filter 100. In addition, a conductive material for filling the holes of the fourth sheet 240 of the ESD protection device 200 can be used for the third external electrode 700. Alternatively, an external electrode may be further formed on the conductive material.

Figure 6 is an exploded perspective view showing a first modification of the common mode noise filter of the circuit protection device according to the present invention.

Referring to Fig. 6, the common mode noise filter 100 is configured by laminating the first to third sheets 110, 120, and 130 on which the internal electrodes, the coil patterns, and the holes are selectively formed. Magnetic sheets are used for the first to third sheets 110, 120, and 130.

The holes 111 and 116, the internal electrodes 112 and 117, and the coil patterns 113 and 118 are formed on the first sheet 110. The holes 111 and 116 are respectively formed in predetermined regions near the center of the first sheet 110 to be spaced apart from each other by a predetermined distance. The holes 111 and 116 are filled with a conductive paste. The internal electrodes 112 and 117 can be formed by extending the coil patterns 113 and 118, respectively. The internal electrodes 112 and 117 are respectively exposed at predetermined positions in the first long side of the first sheet 110 to be spaced apart from each other by a predetermined distance. The coil patterns 113 and 118 are formed in a spiral shape to extend from the inner electrodes 112 and 117 to the holes 111 and 116, respectively. The coil patterns 113 and 118 are formed to be spaced apart from each other so as not to overlap each other.

The holes 121, 124, 126, and 129; the internal electrodes 122 and 127, and the coil patterns 123 and 128 are formed on the second sheet 120. The hole 121 is formed at a predetermined position of the second sheet 120 corresponding to the hole 111 of the first sheet 110, and the hole 124 is formed to be spaced apart from the hole 121 by a predetermined distance. A hole 126 is formed at a predetermined position of the second sheet 120 corresponding to the hole 116 of the first sheet 110, and the hole 129 is formed to be spaced apart from the hole 126 by a predetermined distance. The internal electrodes 122 and 127 can be formed by extending the coil patterns 123 and 128, respectively. Internal electrodes 122 and 127 are formed to be in the second sheet 120 The predetermined positions in the first long sides are partially exposed to be spaced apart from each other by a predetermined distance. The coil pattern 123 is formed in a spiral shape to extend from the internal electrode 122 to the hole 124, and the coil pattern 128 is formed in a spiral shape to extend from the internal electrode 127 to the hole 129. The coil patterns 123 and 128 are formed to be spaced apart from each other so as not to overlap each other.

Internal electrodes 131, 132, 133, and 134 are formed on the third sheet 130. The internal electrodes 131, 132, 133 and 134 are formed to extend to a second long side of the third sheet 130, the second long side being opposite the first long side of the third sheet 130, the first long side corresponding to The first long sides of the inner electrodes 112, 117, 122, and 127 of the first sheet 110 and the second sheet 120 are exposed. The internal electrode 131 is formed in a linear shape to extend from a predetermined position of the third sheet 130 corresponding to the holes 111 and 121 to be exposed at the second long side of the third sheet 130, and the internal electrode 132 is formed in a linear shape to A predetermined position corresponding to the hole 124 of the third sheet 130 is extended to be exposed at the second long side of the third sheet 130. The internal electrode 133 is formed in a linear shape to extend from a predetermined position of the third sheet 130 corresponding to the holes 116 and 126 to be exposed at the second long side of the third sheet 130, and the internal electrode 134 is formed in a linear shape to The third sheet 130 extends at a predetermined position corresponding to the hole 129 to be exposed at the second long side of the third sheet 130.

Each of the internal electrode and the coil pattern is formed of a conductive paste by screen printing, sputtering, evaporation, or sol-gel coating. The holes are filled with a conductive paste. The coil pattern 113 is connected to the internal electrode 131 through the holes 111 and 121, and the coil pattern 123 is connected to the internal electrode 132 through the hole 124. The coil pattern 118 is connected to the internal electrode 133 through the holes 116 and 126, and the coil pattern Case 128 is coupled to internal electrode 134 through aperture 129.

At the same time, magnetic sheets may be provided on the first sheet 110 and under the third sheet 130, respectively.

As described above, the common mode noise filter 100 of the circuit protection device according to the first modification of the present invention is manufactured using a magnetic sheet, and a coil pattern and internal electrodes are formed on the magnetic sheet. Accordingly, the common mode noise filter 100 is fabricated such that the coils are formed on the top and bottom surfaces of the first sheet 110. Since the magnetic sheets are respectively formed on the top surface and the bottom surface of the first sheet 110, the leakage of the magnetic flux can be prevented. Therefore, since a magnetic sheet is used, it is not necessary to form a separate magnetic core. Therefore, the structure and manufacturing process of the common mode noise filter can be simplified.

Figure 7 is an exploded perspective view showing a second modification of the common mode noise filter of the circuit protection device according to the present invention.

The common mode noise filter is configured by laminating a plurality of sheets 110, 120, 130, and 140 on which the internal electrodes, the coil patterns, the holes filled with the magnetic paste, and the holes filled with the conductive paste are selectively formed. 100.

The holes 110a and 110b are formed at predetermined positions, preferably in a central region on the first sheet 110, spaced apart from each other. The holes 110a and 110b are filled with a magnetic paste. The magnetic paste contains ferrite iron, a material based on Ni, a material based on Ni-Zn, and a material based on Ni-Zn-Cu and the like.

A plurality of holes 120a, 120b, 121, and 126; a plurality of internal electrodes 122 and 127 and a plurality of coil patterns 123 and 128 are formed on the second sheet 120. The holes 120a and 120b are formed in the central portion of the second sheet 120 corresponding to the holes 110a and 110b formed on the first sheet 110. Hole 120a And 120b is filled with a magnetic paste. The holes 121 and 126 are formed to be spaced apart from the holes 120a and 120b by a predetermined distance, respectively. The holes 121 and 126 are filled with a conductive paste. The internal electrodes 122 and 127 are formed by extending from the coil patterns 123 and 128, respectively. The internal electrodes 122 and 127 are formed to be exposed at predetermined positions in the first long side of the second sheet 120, and are spaced apart from each other. The coil patterns 123 and 128 are formed in a spiral shape to extend from the internal electrodes 122 and 127 to the holes 121 and 126, respectively. The coil patterns 123 and 128 are spaced apart from each other so as not to overlap each other.

A plurality of holes 130a, 130b, 131, 134, 136, and 139; a plurality of internal electrodes 132 and 137 and a plurality of coil patterns 133 and 138 are formed on the third sheet 130. The holes 130a and 130b are formed in the third sheet 130 corresponding to the central regions of the holes 110a and 110b and the holes 120a and 120b formed on the first sheet 110 and the second sheet 120, respectively. The holes 130a and 130b are filled with a magnetic paste. The holes 131 and 134 are spaced apart from the holes 130a by a predetermined distance to be symmetrical with respect to the holes 130a. The holes 131 and 134 are filled with a conductive paste. The holes 136 and 139 are spaced apart from the holes 130b by a predetermined distance to be symmetrical with respect to the holes 130b. The holes 136 and 139 are filled with a conductive paste. Obviously, the holes 130a, 130b, 131, 134, 136, and 139 are spaced apart from each other by a predetermined distance. The internal electrodes 132 and 137 are formed to extend from the coil patterns 133 and 138, respectively. The internal electrodes 132 and 137 are formed to be exposed at predetermined positions in the first long side of the third sheet 130 while being spaced apart from each other by a predetermined distance. The coil patterns 133 and 138 are formed in a spiral shape to extend from the inner electrodes 132 and 137 to the holes 134 and 139, respectively. The coil patterns 133 and 138 are spaced apart from each other so as not to overlap each other.

A plurality of internal electrodes 141, 142, 143, and 144 and a plurality of holes 140a and 140b are formed on the fourth sheet 140. The holes 140a and 140b are formed in the central regions of the fourth sheet 140 corresponding to the holes 110a and 110b, the holes 120a and 120b, and the holes 130a and 130b formed in the first to third sheets 110, 120 and 130, respectively. The holes 140a and 140b are filled with a magnetic paste such as ferrite iron, a material based on Ni, a material based on Ni-Zn, and a material based on Ni-Zn-Cu and the like. A plurality of internal electrodes 141, 142, 143 and 144 are formed to extend to a second long side of the fourth sheet 140, the second long side being opposite the first long side of the fourth sheet 140, the first long side Corresponding to the first long sides of the inner electrodes 122 and 127 of the second sheet 120 and the third sheet 130 and the inner electrodes 132 and 137 respectively exposed. The inner electrode 141 is formed in a linear shape to extend from a predetermined position of the fourth sheet 140 corresponding to the holes 121 and 131 to be exposed at the second long side of the fourth sheet 140. The inner electrode 142 is formed to extend from a predetermined position of the fourth sheet 140 corresponding to the hole 134 to be exposed at the second long side of the fourth sheet 140, and the inner electrode 143 is formed in a linear shape from the fourth sheet 140 The predetermined positions corresponding to the holes 126 and 136 extend to be exposed at the second long side of the fourth sheet 140. The inner electrode 144 is formed to extend at a predetermined position of the fourth sheet 140 corresponding to the hole 139 to be exposed at the second long side of the fourth sheet 140.

The plurality of internal electrodes 112, 117, 122, 127, 132, and 137 and the plurality of coil patterns 212, 217, 223, and 227 are formed of a conductive paste by screen printing, sputtering, evaporation, or sol-gel coating. Each of the holes 110a, 110b, 120a, 120b, 130a, 130b, 140a, and 140b is filled There is a magnetic paste, and each of the plurality of holes 121, 126, 131, 134, 136, and 139 is filled with a conductive paste. Therefore, the coil pattern 123 is connected to the internal electrode 141 through the holes 121 and 131, and the coil pattern 133 is connected to the internal electrode 142 through the hole 134. The coil pattern 128 is connected to the internal electrode 143 through the holes 126 and 136, and the coil pattern 138 is connected to the internal electrode 144 through the hole 139. Therefore, a double solenoid type common mode noise filter having coils wound around the magnetic poles is formed.

Meanwhile, magnetic sheets may be provided on the top and bottom surfaces of the first sheet 110 and the fourth sheet 140, respectively.

As described above, the common mode noise filter according to the second modification of the present invention is manufactured in a solenoid type in which a coil formed of a conductive pattern is wound around a magnetic core made of a magnetic paste, The magnetic paste fills the holes that are drilled vertically through the plurality of laminated sheets.

Figure 8 is an exploded perspective view showing a first modification of the ESD protection device of the circuit protection device according to the present invention, and Figure 9 is a bottom perspective view showing the assembled state of the circuit protection device according to the present invention. .

The ESD protection device 200 is configured by laminating the first to fourth sheets 210, 220, 230, and 240 on which the internal electrodes and the holes are selectively formed. Since the configurations of the first sheet 210, the second sheet 220, and the third sheet 230 are the same as those described in FIG. 3, the description thereof will be omitted.

The first split portion 245 and the second split portion 246 are formed on the fourth sheet 240 to be spaced apart from each other. The first split portion 245 is formed in correspondence In a region of the first hole 231 and the second hole 232 of the third sheet 230, the first hole 231 and the second hole 232 are exposed through the first split portion 245. The second cut-away portion 246 is formed in a region corresponding to the third hole 233 and the fourth hole 234 of the third sheet 230 such that the third hole 233 and the fourth hole 234 are exposed through the second split portion 246. Each of the cut-away portions 245 or 246 is filled with a conductive paste, and the conductive paste serves as a third external electrode 710 or 720 connected to the ground terminal.

A top perspective view of the assembled state of the circuit protection device is the same as that shown in FIG. 1, and a bottom perspective view of the assembled state of the circuit protection device is shown in FIG.

Figure 10 is an exploded perspective view showing a second modification of the ESD protection device of the circuit protection device according to the present invention, and Figure 11 is a bottom perspective view showing the assembled state of the circuit protection device according to the second modification of the present invention. .

The ESD protection device 200 is configured by laminating the first to fourth sheets 210, 220, 230, and 240 on which the internal electrodes and the holes are selectively formed. Since the configurations of the first sheet 210, the second sheet 220, and the third sheet 230 are the same as those described in FIG. 3, the description thereof will be omitted.

A split portion 245 is formed on the fourth sheet 240. The cut-away portion 245 is formed in a region corresponding to the first to fourth holes 231, 232, 233, and 234 of the third sheet 230 such that the first to fourth holes 231, 232, 233, and 234 are cut through Part 245 is exposed. The cut-away portion is filled with a conductive paste, and the conductive paste serves as a third external electrode 700 connected to the ground terminal.

A top perspective view of the assembled state of the circuit protection device is the same as that shown in FIG. 1, and a bottom perspective view of the assembled state of the circuit protection device is shown in FIG.

Figure 12 is an exploded perspective view showing a third modification of the ESD protection device of the circuit protection device according to the present invention.

The ESD protection device 200 is configured by laminating the first to fourth sheets 210, 220, 230, and 240 on which the internal electrodes and the holes are selectively formed. Since the configurations of the third sheet 230 and the fourth sheet 240 are the same as those described in the embodiment of the present invention, the description thereof will be omitted. The configuration of the first sheet 210 and the second sheet 220 will be described as follows.

First to fourth holes 211a, 212a, 213a, and 214a are formed on the top surface of the first sheet 210; fifth to eighth holes 211b, 212b, 213b, and 214b; first to fourth internal electrodes 215a 216a, 217a, and 218a and fifth to eighth internal electrodes 215b, 216b, 217b, and 218b. The first to fourth holes 211a, 212a, 213a, and 214a are formed to be spaced apart from the second long side of the first sheet 210 by a predetermined distance. The fifth to eighth holes 211b, 212b, 213b, and 214b are formed to be spaced apart from the first long side of the first sheet 210 by a predetermined distance. The first to fourth inner electrodes 215a, 216a, 217a, and 218a are exposed at the second long side of the first sheet 210, and are connected to the first to fourth holes 211a, 212a, 213a, and 214a while being spaced apart from each other open. The fifth to eighth inner electrodes 215b, 216b, 217b, and 218b are exposed at the first long side of the first sheet 210, and are connected to the fifth to eighth holes 211b, 212b, 213b, and 214b while being spaced apart from each other open. First to fourth holes 211a, 212a, 213a, and 214a and fifth to eighth holes 211b, 212b, 213b, and 214b are formed at positions opposing each other. For example, the first to fourth holes 211a, 212a, 213a, and 214a are respectively formed at one-eighth, three-eighth, five-eighth, and seven-eighth of the line on the straight line. The straight line is formed by connecting the opposite long sides from the second long side of the first sheet 210 to a quarter point of the first long side. The fifth to eighth holes 211b, 212b, 213b, and 214b are formed with respect to the first to fourth holes 211a, 212a, 213a, and 214a to be spaced apart from each other by one-half of the length of the first short side. The first to fourth internal electrodes 215a, 216a, 217a, and 218a are formed to be exposed at the second long side of the first sheet 210. Each of the first to fourth inner electrodes 215a, 216a, 217a, and 218a is formed in a linear shape having a predetermined width to be connected to the first to fourth holes 211a, 212a, 213a, and 214a Each. The fifth to eighth inner electrodes 215b, 216b, 217b, and 218b are formed to be exposed at the first long side of the first sheet 210. Each of the fifth to eighth inner electrodes 215b, 216b, 217b, and 218b is formed in a linear shape having a predetermined width to be connected to the fifth to eighth holes 211b, 212b, 213b, and 214b. Each.

The first to fourth holes 221, 222, 223, and 224 and the first to inner electrode fourth inner electrodes 225, 226, 227, and 228 are formed on the top surface of the second sheet 220. The first to fourth holes 221, 222, 223 and 224 are respectively formed at one-eighth point, three-eighth point, five-eighth point and seven-eighth point on the straight line, and the straight line is connected by The center point of the opposite short side of the second sheet 220 is formed. First to fourth internal electrodes 225, 226, 227, and 228 are spaced apart from the first long side and the second long side of the second sheet 220 by a predetermined distance so as not to be exposed at the first long side and the second long side of the second sheet 220. Each of the first to fourth inner electrodes 225, 226, 227, and 228 is formed in a linear shape having a predetermined width such that one side thereof is connected to the first to fourth holes 211a, 212a, 213a, respectively. And 214a, and the other side thereof is connected to the fifth to eighth holes 211b, 212b, 213b, and 214b, respectively. For example, the first to fourth internal electrodes 225, 226, 227, and 228 are formed to pass through the first to fourth holes 221, 222, 223, and 224, respectively, from the first corresponding to the first sheet 210. The positions of the holes to the fourth holes 211a, 212a, 213a, and 214a extend to positions corresponding to the fifth to eighth holes 211b, 212b, 213b, and 214b of the first sheet 210.

Here, the holes 211a, 212a, 213a, 214a, 211b, 212b, 213b, and 214b of the first sheet 210 are filled with an ESD protection material. The ESD protective material may comprise a mixture of organic materials such as polyvinyl alcohol (PVA) or polyvinyl butyral (PVB) with RuO ₂ , Pt, Pd, Ag, Au, Ni, Cr, W and At least one electrically conductive material of the analog is mixed. In addition, an ESD protection material may be further obtained by mixing a varistor material such as ZnO or an insulating ceramic material such as Al ₂ O ₃ with the mixture. In addition, the holes 221, 222, 223 and 224 of the second sheet 220 are filled with a conductive paste, and the internal electrodes 215a, 216a, 217a, 218a, 215b, 216b, 217b and 218b of the first sheet 210 and the inside of the second sheet 220 are filled. The electrodes 225, 226, 227, and 228 are formed of a conductive paste by screen printing, sputtering, evaporation, or sol-gel coating methods.

Figure 13 is an exploded view of a fourth modification of the ESD protection device of the circuit protection device according to the present invention. The configuration of the first sheet 210 and the second sheet 220 is the same as that of the third modification described in FIG. 12, and the configuration of the third sheet 230 and the fourth sheet 240 is the same as the group of the first modification described in FIG. The state is the same.

Figure 14 is an exploded view of a fifth modification of the ESD protection device of the circuit protection device according to the present invention. The configuration of the first sheet 210 and the second sheet 220 is the same as that of the third modification described in FIG. 12, and the configuration of the third sheet 230 and the fourth sheet 240 is the same as that of the first modification described in FIG. The state is the same.

Figure 15 is an exploded view of a sixth modification of the ESD protection device of the circuit protection device according to the present invention. Two split portions 221a and 222a and two split portions 231a and 232a are formed on the second sheet 220 and the third sheet 230, respectively. That is, although in the second modification, a plurality of holes (for example, four holes) are formed on each of the second sheet 220 and the third sheet 230, in the sixth modification, the section 221a is cut away. And 222a and the cut-away portions 231a and 232a are formed at positions corresponding to the cut-away portions 245 and 246 formed on the fourth sheet 240, respectively, in the second sheet 220 and the third sheet 230. Here, the cut-away portions 221a and 222a formed on the second sheet 220 and the cut-away portions 231a and 232a formed on the third sheet 230 may be formed to have a smaller than the cut-away portion 245 formed on the fourth sheet 240. And the size of 246. The sixth modification can be used not only in the second modification but also as a configuration of the holes formed in the second and third sheets of the ESD protection device described in the present invention.

Figure 16 is an exploded perspective view showing a seventh modification of the ESD protection device of the circuit protection device according to the present invention. The cut-away portions 221a and 231a are formed on the second sheet 220 and the third sheet 230, respectively. That is, although in the second modification, a plurality of holes (for example, four holes) are formed on each of the second sheet 220 and the third sheet 230, in the seventh modification, the second sheet 220 The cut-away portion 221a and the cut-away portion 231a of the third sheet 230 are formed in positions corresponding to the cut-away portions 245 formed on the fourth sheet 240. Here, the cut-away portion 221a formed on the second sheet 220 and the cut-away portion 231a formed on the third sheet 230 may be formed to have a size smaller than the cut-away portion 245 formed on the fourth sheet 240. The seventh modification can be used not only in the second modification but also as a configuration of the holes formed in the second and third sheets of the ESD protection device described in the present invention.

Figure 17 is an exploded perspective view showing an eighth modification of the ESD protection device of the circuit protection device according to the present invention. The holes 211, 212, 213, and 214 of the first sheet 210 are formed in the central portion of the first sheet 210. The holes 211, 212, 213 and 214 are filled with an ESD protection material. Internal electrodes 215, 216, 217, and 218 are formed to cover the holes 211, 212, 213, and 214 filled with the ESD protection material. Accordingly, the holes 221, 222, 223, and 224 are respectively formed at positions of the second sheet 220 corresponding to the holes 211, 212, 213, and 214 of the first sheet 210. The internal electrodes described in the previous embodiments are not formed on the second sheet 220.

18 is a graph showing the variation of the parasitic capacitance according to the shape of the third external electrode of the circuit protection device according to the present invention, wherein the present invention In the case, and in the case where the external electrode is connected to a conventional circuit protection device of an ESD protection device formed on the side surface thereof, the variation of the parasitic capacitance is measured. Here, "A" indicates a parasitic capacitance when an external electrode is formed on a side surface of a conventional circuit protection device; "B" indicates when four third external electrodes are formed on a bottom surface of the circuit protection device (FIG. 2) Parasitic capacitance when shown in ). "C" indicates a parasitic capacitance when two third external electrodes are formed on the bottom surface of the circuit protection device (as shown in FIG. 9), and "D" indicates when a single third external electrode is formed in the circuit protection device Parasitic capacitance on the bottom surface (as shown in Figure 11). The parasitic capacitance generated between the common mode noise filter and the third external electrode is measured. As the distance between the coil pattern of the common mode noise filter and the third external electrode becomes longer and the overlapping area becomes narrower, the parasitic capacitance decreases. As can be seen from the graph, in conventional circuit protection devices, the parasitic capacitance is 1 picofarad or greater. In this case, the signal that is transferred through the common noise filter may be distorted. However, in the present invention, the parasitic capacitance in all cases is 0.8 picofarad or less, but as the number of the third external electrodes increases, the parasitic capacitance decreases.

Since the parasitic capacitance is less than 1 picofarad, specifically 0.8 picofarad or less, the capacitance does not change at the input/output terminals using higher frequencies, and therefore, the signal does not become distorted. Therefore, the reliability of the circuit can be enhanced.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. this The scope of the invention is defined by the scope of the appended claims.

10‧‧‧Circuit protection device

100‧‧‧Common mode noise filter

110‧‧‧Sheet

110a‧‧ hole

110b‧‧‧ hole

111‧‧‧ hole

112‧‧‧Internal electrodes

113‧‧‧ coil pattern

116‧‧‧ hole

117‧‧‧Internal electrodes

118‧‧‧ coil pattern

120‧‧‧Sheet

120a‧‧ hole

120b‧‧‧ hole

121‧‧‧ hole

122‧‧‧Internal electrodes

123‧‧‧ coil pattern

124‧‧‧Internal electrodes

126‧‧‧ hole

127‧‧‧Internal electrodes

128‧‧‧ coil pattern

129‧‧‧ hole

130‧‧‧Sheet

130a‧‧ hole

130b‧‧‧ hole

131‧‧‧ hole

132‧‧‧Internal electrodes

133‧‧‧ coil pattern

134‧‧‧ hole

136‧‧‧ hole

137‧‧‧Internal electrodes

138‧‧‧ coil pattern

139‧‧‧ hole

140‧‧‧Sheet

140a‧‧ hole

140b‧‧‧ hole

141‧‧‧ hole

142‧‧‧Internal electrodes

143‧‧‧Internal electrodes

144‧‧‧Internal electrodes

150‧‧‧Sheet

151‧‧‧ hole

152‧‧‧Internal electrodes

160‧‧‧Sheet

162‧‧‧Internal electrodes

163‧‧‧ coil pattern

170‧‧‧Sheet

172‧‧‧Internal electrodes

173‧‧‧ coil pattern

180‧‧‧Sheet

181‧‧‧ hole

182‧‧‧Internal electrodes

200‧‧‧Electrostatic discharge protection device

210‧‧‧ first sheet

211‧‧‧ first hole

211a‧‧‧ first hole

211b‧‧‧ fifth hole

212‧‧‧second hole

212a‧‧‧second hole

212b‧‧‧ sixth hole

213‧‧‧ third hole

213a‧‧‧ third hole

213b‧‧‧ seventh hole

214‧‧‧ fourth hole

214a‧‧‧ fourth hole

214b‧‧‧8th hole

215‧‧‧First internal electrode

215a‧‧‧First internal electrode

215b‧‧‧ fifth internal electrode

216‧‧‧Second internal electrode

216a‧‧‧Second internal electrode

216b‧‧‧ sixth internal electrode

217‧‧‧ Third internal electrode

217a‧‧‧3rd internal electrode

217b‧‧‧ seventh internal electrode

218‧‧‧fourth internal electrode

218a‧‧‧fourth internal electrode

218b‧‧‧8th internal electrode

220‧‧‧Second sheet

221‧‧‧ first hole

221a‧‧‧ Cutaway

222‧‧‧ second hole

222a‧‧‧ Cutaway

223‧‧‧ third hole

224‧‧‧ fourth hole

225‧‧‧First internal electrode

226‧‧‧Second internal electrode

227‧‧‧ Third internal electrode

228‧‧‧fourth internal electrode

230‧‧‧ third sheet

231‧‧‧ first hole

231a‧‧‧ Cutaway

232‧‧‧second hole

233‧‧‧ third hole

234‧‧‧ fourth hole

240‧‧‧fourth sheet

241‧‧‧ first hole

242‧‧‧ second hole

243‧‧‧ third hole

244‧‧‧ fourth hole

245‧‧‧ first section

246‧‧‧Second section

300‧‧‧Upper cover

410‧‧‧First insulating sheet

420‧‧‧First magnetic sheet

430‧‧‧Second magnetic sheet

440‧‧‧Second insulation sheet

450‧‧‧ Third magnetic sheet

460‧‧‧fourth magnetic sheet

500‧‧‧First external electrode

510‧‧‧First external electrode

520‧‧‧First external electrode

530‧‧‧First external electrode

540‧‧‧First external electrode

600‧‧‧Second external electrode

610‧‧‧Second external electrode

620‧‧‧Second external electrode

630‧‧‧Second external electrode

640‧‧‧Second external electrode

700‧‧‧ Third external electrode

710‧‧‧ Third external electrode

720‧‧‧ Third external electrode

730‧‧‧ Third external electrode

740‧‧‧ Third external electrode

A, B, C, D‧‧‧ parasitic capacitance

S110~S170‧‧‧Steps

1 is a top perspective view of an assembled circuit protection device in accordance with the present invention.

2 is a bottom perspective view showing the assembled state of the circuit protection device in accordance with the present invention.

Figure 3 is an exploded perspective view of the circuit protection device in accordance with the present invention.

4 is an equivalent circuit diagram of a circuit protection device in accordance with the present invention.

Figure 5 is a flow chart illustrating a method of fabricating a circuit protection device in accordance with the present invention.

Figure 6 is an exploded perspective view of a first modification of the common mode noise filter of the circuit protection device in accordance with the present invention.

Figure 7 is an exploded perspective view of a second modification of the common mode noise filter of the circuit protection device in accordance with the present invention.

Figure 8 is an exploded perspective view showing a first modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 9 is a bottom perspective view showing the assembled state of the first modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 10 is an exploded perspective view showing a second modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 11 is a bottom perspective view showing an assembled state of a second modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 12 is an exploded perspective view showing a third modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 13 is an ESD protection device for a circuit protection device according to the present invention An exploded perspective view of the fourth modification.

Figure 14 is an exploded perspective view showing a fifth modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 15 is an exploded perspective view showing a sixth modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 16 is an exploded perspective view showing a seventh modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 17 is an exploded perspective view showing an eighth modification of the ESD protection device of the circuit protection device according to the present invention.

Figure 18 is a graph showing changes in parasitic capacitance depending on the shape of the third external electrode of the circuit protection device according to the present invention.

100‧‧‧Common mode noise filter

200‧‧‧Electrostatic discharge protection device

300‧‧‧Upper cover

500‧‧‧First external electrode

510‧‧‧First external electrode

520‧‧‧First external electrode

530‧‧‧First external electrode

540‧‧‧First external electrode

600‧‧‧Second external electrode

610‧‧‧Second external electrode

620‧‧‧Second external electrode

630‧‧‧Second external electrode

640‧‧‧Second external electrode

700‧‧‧ Third external electrode

710‧‧‧ Third external electrode

720‧‧‧ Third external electrode

730‧‧‧ Third external electrode

740‧‧‧ Third external electrode

Claims (16)

A circuit protection device comprising: a laminate having a laminated common mode noise filter and an electrostatic discharge (ESD) protection device; a first external electrode and a second external electrode respectively formed on the laminate One side surface and the other side surface of the article; and a third outer electrode formed on the top or bottom surface of the laminate. The circuit protection device of claim 1, wherein the common mode noise filter comprises a plurality of sheets on which internal electrodes, coil patterns and fillings exposed to the outside are selectively formed A hole with a conductive material. The circuit protection device of claim 2, wherein the hole filled with the magnetic material is more selectively formed on each of the plurality of sheets. The circuit protection device of claim 1, further comprising at least one magnetic sheet formed on the common mode noise filter and between the common mode noise filter and the ESD protection device. The circuit protection device of claim 1, wherein the ESD protection device comprises a plurality of sheets on which an internal electrode exposed to the outside, a hole filled with a conductive material, and A hole filled with an ESD protection material. The circuit protection device of claim 5, wherein the ESD protection material is formed of a mixture of an organic material selected from the group consisting of RuO ₂ , Pt, Pd, Ag, Au, Ni, Cr, and W At least one electrically conductive material is mixed. The circuit protection device of claim 6, wherein the ESD protection material is further mixed with the mixture using a varistor material or an insulating ceramic material. The circuit protection device of claim 1, wherein the first external electrode is connected to the common mode noise filter and the ESD protection device, and the second external electrode is connected to the common mode A noise filter, and the third external electrode is connected to the ESD protection device. The circuit protection device of claim 1, wherein the first external electrode and the second external electrode are connected to an input/output terminal and a circuit, and the third external electrode is connected to a ground terminal. The circuit protection device of claim 2, wherein the first external electrode is connected to the internal electrode exposed at one side of the common mode noise filter and the ESD The internal electrode of the device is protected, and the second external electrode is coupled to the internal electrode exposed at the other side of the common mode noise filter. The circuit protection device of claim 5, wherein the third external electrode is connected to the hole of the ESD protection device, the hole being filled with a conductive material. The circuit protection device of claim 1, wherein the ESD protection device comprises: a first sheet having a plurality of first filled with ESD protection material a hole, and a plurality of first internal electrodes connected to the first hole and exposed to an outer side thereof; a second sheet having a plurality of holes filled with a conductive material, and a plurality of connected to the plurality of holes and An internal electrode of the hole of the first sheet; a third sheet having a plurality of holes formed at positions corresponding to the plurality of holes of the second sheet, the holes being filled with a conductive material; a fourth sheet having a third external electrode formed at a position corresponding to the plurality of holes of the third sheet, the third external electrode being formed by filling a hole with a conductive material. The circuit protection device of claim 12, wherein the first sheet further comprises: a plurality of second holes formed to be spaced apart from the plurality of first holes, the second holes being filled There is an ESD protection material; and a plurality of second internal electrodes connected to the plurality of second holes and exposed to the other outer side thereof. The circuit protection device of claim 12, wherein the fourth sheet is a magnetic sheet. The circuit protection device of claim 12, wherein the third external electrode comprises one or more third external electrodes. The circuit protection device of claim 1, wherein the parasitic capacitance between the common mode noise filter and the ESD protection device is less than 1 picofarad.