KR102175234B1 - Circuit protection device - Google Patents

Abstract

A circuit protection element is provided. The circuit protection device according to the present invention includes a first sheet on which a pair of capacitor electrodes is formed; The second sheet is located above the first sheet and the first coil pattern is formed, the third sheet is located below the first sheet and the second coil pattern is formed, and the third sheet is located above the second sheet, and the third coil pattern is formed. It includes a fifth sheet located under the 4 sheet and the third sheet and having a fourth coil pattern formed therebetween, and the first coil pattern and the fourth coil pattern are connected through holes in which a conductive material formed between sheets is buried. A first inductor is formed, and a second coil pattern and a third coil pattern are connected through holes filled with a conductive material formed between sheets therebetween to form a second inductor, and a pair of capacitor electrodes and the first and At least four capacitors are formed between the second coil patterns.

Description

Circuit protection device

The present invention relates to a circuit protection element.

Recently, various frequency bands have been used in accordance with the multifunctionalization of portable electronic devices, such as smart phones. That is, a plurality of functions using different frequency bands, such as wireless LAN, Bluetooth, and GPS, have been adopted within one smartphone. Further, as electronic devices become highly integrated, the density of internal circuits in a limited space increases, and noise interference inevitably occurs between internal circuits. For example, 750MHz noise degrades the call quality of a smartphone, and 1.5㎓ noise degrades the GPS quality. And, the 2.4 GHz noise degrades the quality in the Wi-Fi band.

In this way, a plurality of circuit protection elements are used to suppress noise of various frequencies of portable electronic devices and to suppress noise between internal circuits. For example, capacitors, chip beads, common mode filters, etc. that remove noise in different frequency bands are used.

Here, the common mode filter has a structure in which two choke coils are combined into one, and can pass a signal current in a differential mode and remove only a noise current in the common mode. That is, the common mode filter can classify and remove a signal current in a differential mode, which is an AC current, and a noise current in a common mode.

By the way, it is good to suppress both 750MHz noise which degrades the call quality of smartphones, 1.5GHz noise which degrades the quality of GPS, and 2.4GHz noise, but the conventional common mode noise filter It removes only the noise and not other noise. Therefore, the quality of any one function is inevitably degraded by noise.

In addition, the common mode noise filter has excellent performance as the insertion loss value decreases, and there is a need to develop a common mode filter having a structure for reducing the insertion loss value as described above.

An embodiment of the present invention provides a circuit protection device capable of suppressing noise in two or more frequency bands.

In addition, an embodiment of the present invention provides a circuit protection device capable of reducing an insertion loss value.

According to an aspect of the present invention, a first sheet is formed with a pair of capacitor electrodes; A second sheet positioned above the first sheet and having a first coil pattern formed thereon; A third sheet positioned under the first sheet and having a second coil pattern formed thereon; A fourth sheet positioned above the second sheet and having a third coil pattern formed thereon, and a fifth sheet positioned below the third sheet and having a fourth coil pattern formed thereon, wherein the first coil pattern and the fourth coil pattern The conductive material formed between the sheets is connected through the buried holes to form a first inductor, and the second coil pattern and the third coil pattern are formed between the sheets and the conductive material is buried. A circuit protection device is provided that is connected to each other to form a second inductor, and in which at least four capacitors are formed between the pair of capacitor electrodes and the first and second coil patterns.

In this case, the pair of capacitor electrodes may be formed symmetrically with respect to the central portion of the first sheet.

In this case, the pair of capacitor electrodes may have the same shape.

In this case, each of the pair of capacitor electrodes may have a shape including a quadrangular shape, a polygonal shape including a rounded corner shape, a circular shape, an oval shape, a spiral shape, and a serpentine shape.

In this case, inductance and capacitance may be adjusted according to at least one of the number of turns of the coil pattern, the area of the capacitor electrode, and a distance between the capacitor electrode and the coil pattern.

In this case, the area of the coil pattern relative to the area of the pair of capacitor electrodes may be 1 to 100% to 100%.

In this case, the area of the coil pattern relative to the area of the pair of capacitor electrodes may be 70% or more and less than 90%.

In this case, the area of the coil pattern relative to the area of the pair of capacitor electrodes may be 25% or more and less than 45%.

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In this case, the circuit protection element further includes first lead electrodes each connected to the coil patterns and exposed to the outside of the sheets, and second lead electrodes connected to the capacitor electrode and exposed to the outside of the sheet. Can include.

In this case, the circuit protection element further includes a first external electrode connected to the first drawing electrodes and formed on side surfaces of the sheets, and a second external electrode connected to the second drawing electrode and formed on the side surfaces of the sheets. In addition, the first external electrode may be connected between an input/output terminal and a circuit, and the second external electrode may be connected to a ground terminal.

The circuit protection device according to an embodiment of the present invention can suppress noise in two or more frequency bands.

The circuit protection device according to an embodiment of the present invention can reduce an insertion loss value.

1 is a combined perspective view of a circuit protection device according to an embodiment of the present invention.
2 is an exploded perspective view of a circuit protection device according to an embodiment of the present invention.
3 is a characteristic graph comparing characteristics of a circuit protection device according to an embodiment of the present invention and a conventional circuit device.
4 is a graph of characteristics according to a ratio of a capacitor area to a pattern area of a circuit protection device according to an exemplary embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and the same reference numerals are assigned to the same or similar components throughout the specification.

Referring to FIG. 1, the circuit protection device according to an embodiment of the present invention is made of a laminate in which a plurality of insulating sheets are stacked, from above, an upper cover layer 1, a common mode noise filter 10, and a lower cover. It may include a layer (2).

In this case, a first external electrode 3 formed on the side of the stacked body and connected to the lead electrode inside the common mode noise filter 10 and a second external electrode connected to the capacitor electrode inside the common mode noise filter 10 It may further include an electrode (4).

The first external electrodes 3 may be formed on the first side and the second side opposite to the first side of the stacked body, respectively, and may be formed on the first and second side, respectively, two.

The second external electrode 4 may be formed on the third and fourth side surfaces of the stack on which the first external electrode 3 is not formed, and may be formed on the third and fourth side surfaces, respectively. The first external electrode 3 may be connected between the input terminal and the output terminal, respectively, and the second external electrode 4 may be connected to the ground terminal.

That is, the first external electrode 3 formed on one side of the circuit protection element is connected to the signal input terminal, and the first external electrode 3 formed on the other side corresponding thereto may be connected to an output terminal, for example, a system. have.

On the other hand, the upper cover layer 1 and the lower cover layer 2 may be configured by stacking a plurality of sheets, respectively, and the plurality of sheets constituting the common mode noise filter 10 are formed of a non-magnetic sheet. .

In the common mode noise filter 10, as shown in FIG. 2, a plurality of sheets 20, 30, 40, 50, 60 may be stacked, and the plurality of sheets 20, 30, 40, 50, 60 A lead electrode, a coil pattern, a hole in which a conductive material is embedded, and a capacitor electrode may be selectively formed.

The configuration of the common mode noise filter 10 will be described in more detail as follows.

A first sheet 40 is provided in the center of the common noise filter. The first sheet 40 may be formed in a substantially rectangular plate shape having a predetermined thickness. For example, the first sheet 40 may have a square or rectangular shape.

The first sheet 40 is formed with two holes 44 and 48, a pair of capacitor electrodes 42 and 46, and second lead electrodes 43 and 47.

The holes 44 and 48 may be formed to be spaced apart from each other, and may be formed to be spaced apart from each other in one direction and the other direction facing each other along a long side at a center point of the first sheet 40. The hole 44 may be spaced apart from the center point of the first sheet 40 in one direction and formed in a predetermined area.

The center point can be defined as a point where two diagonal lines meet when an imaginary line is drawn diagonally from four corners. For example, the first sheet 40 may be formed in a rectangular shape, and the hole 44 may be formed to be spaced apart from the center point of the first sheet 40 by a predetermined distance along one long side direction.

The hole 48 may be formed in a predetermined area by being spaced apart from the center point in another direction at the same distance as the distance of the hole 44 from the center point. That is, the two holes 44 and 48 are formed to be spaced apart at equal intervals in opposite directions based on the center point of the first sheet 40.

The holes 44 and 48 are filled with a conductive material, and may be filled with a metallic material paste.

The pair of capacitor electrodes 42 and 46 may be spaced apart from the holes 44 and 48 to have a predetermined area on both ends of the first sheet 40 in the long side length direction.

In this case, the pair of capacitor electrodes 42 and 46 may be formed symmetrically with respect to the center of the first sheet 40. In addition, the pair of capacitor electrodes 42 and 46 may have the same shape.

In this case, in the present embodiment, a pair of capacitor electrodes 42 and 46 are formed at both ends of the long side in the length direction, but a pair of capacitor electrodes may be formed at both ends of the short side direction.

In addition, each of the pair of capacitor electrodes 42 and 46 may be formed in various shapes such as a square, a polygon (including a rounded shape), a circle, an oval, a spiral shape, and a meander shape.

The second sheet 30 is located above the first sheet 40, and the second sheet 30 has two holes 34 and 38, a first coil pattern 32 and a first lead electrode 36 Is formed. The second sheet 30 may be formed in a substantially rectangular plate shape having a predetermined thickness.

The hole 34 may pass through the second sheet 30 and may be formed in the central region of the second sheet 30. In this case, the hole 34 may be formed at the same position as the hole 44 formed in the first sheet 40.

In addition, the hole 38 may be formed in a predetermined area by being spaced apart from the center point in another direction at the same distance as the separation distance of the hole 34 from the center point. That is, the two holes 34 and 38 are formed to be spaced apart at equal intervals in opposite directions based on the center point of the second sheet 30.

The holes 34 and 38 are filled with a conductive material, and may be filled using a metallic material paste. In addition, the holes 34 and 38 are respectively connected to the conductive material buried in the holes 44 and 48 of the first sheet 40 by a conductive material.

The first coil pattern 32 may be formed with a predetermined number of turns by rotating in one direction from the hole 34.

In this case, the first coil pattern 32 may be formed so as not to pass through the central region and the hole 38 of the second sheet 30. For example, the first coil pattern 32 may have a predetermined width and spacing, and may be formed as a rectangle that rotates clockwise outward, but the shape of the first coil pattern is not limited thereto. In addition, an end of the coil pattern 32 is connected to the first lead electrode 36.

The first lead electrode 36 is formed to have a predetermined width and is formed to be exposed to one side of the second sheet 30, for example, to one side of the long side.

A third sheet 50 is provided under the first sheet 40. Holes 54 and 58, a second coil pattern 52, and a first lead electrode 56 are formed in the third sheet 50. The third sheet 50 is formed in a substantially rectangular plate shape having a predetermined thickness, and may be formed in the same shape as the first and second sheets 40 and 30. The holes 54 and 58 may pass through the third sheet 50 and may be formed in a central region of the third sheet 50.

In this case, the hole 54 may be formed at the same position as the hole 44 formed in the first sheet 40 and the hole 34 formed in the second sheet 30. A conductive material is buried in the hole 54, for example, it may be buried using a paste of a metal material, thereby being connected to the holes 44 and 34 of the first and second sheets 40 and 30.

In addition, the hole 58 may be formed in a predetermined area by being spaced apart from the center point in another direction at the same distance as the distance of the hole 54 from the center point. That is, the hole 54 and the hole 58 are formed to be spaced apart at equal intervals in opposite directions based on the center point of the third sheet 50. In addition, the second coil pattern 52 may be formed with a predetermined number of turns by rotating in one direction from the hole 58.

In this case, the second coil pattern 52 may be formed so as not to pass through the central region and the hole 54 of the third sheet 50. For example, the second coil pattern 52 may have a predetermined width and interval, and may be formed in a rectangular shape that rotates outward in a counterclockwise direction, but the shape of the second coil pattern 52 is not limited thereto. .

That is, the second coil pattern 52 may be formed by rotating in a direction opposite to the first coil pattern 32 formed on the second sheet 30. In addition, an end of the second coil pattern 52 is connected to the first lead electrode 56. The first lead electrode 56 is formed to have a predetermined width and is formed to be exposed to one side of the third sheet 50.

In this case, the first withdrawal electrode 56 is formed to be exposed to a surface opposite to the first withdrawal electrode 36 formed on the second sheet 30. In addition, the first lead electrode 36 is formed to form a straight line with the first lead electrode 26 formed on the fourth sheet 20.

A fourth sheet 20 is positioned above the second sheet 30. A hole 28, a third coil pattern 22, and a first lead electrode 26 are formed in the fourth sheet 20. The fourth sheet 20 may be formed in a substantially rectangular plate shape having a predetermined thickness. That is, the fourth sheet 20 may have a square or rectangular shape. The hole 28 may be spaced apart from the center point of the fourth sheet 20 in one direction and formed in a predetermined area.

The hole 28 is filled with a conductive material, which may be filled using a metallic material paste. In this case, the hole 28 may be formed at the same position as the hole 38 of the second sheet 30. The hole 28 is connected to a conductive material embedded in the hole 38 of the second sheet 30.

In addition, the third coil pattern 22 may be formed with a predetermined number of turns by rotating in one direction from the hole 28.

In this case, the third coil pattern 22 may be formed so as not to pass through the central region of the fourth sheet 20. For example, the third coil pattern 22 may have a predetermined width and spacing, and may be formed in a rectangular shape that rotates clockwise outward, but the shape of the third coil pattern 22 is not limited thereto.

In this case, the line width and spacing of the third coil pattern 22 may be the same. In addition, the end of the third coil pattern 22 is connected to the first lead electrode 26. The first lead electrode 26 is formed to have a predetermined width and is formed to be exposed to one side of the fourth sheet 20. For example, the first lead electrode 26 is formed to extend in the short side direction of the fourth sheet 20.

A fifth sheet 60 is provided under the third sheet 50. A hole 64, a fourth coil pattern 62, and a first lead electrode 66 are formed in the fifth sheet 60. The fifth sheet 60 may be formed in a substantially rectangular plate shape having a predetermined thickness, and may be formed in the same shape as the first to fourth sheets 40, 30, 50, and 20. The hole 64 may be spaced apart from the center point of the fifth sheet 60 in one direction to be formed in a predetermined area. For example, the hole 64 may be formed in the same area as the hole 54 of the third sheet 50.

In addition, the fourth coil pattern 62 may be rotated in one direction from the hole 64 to be formed with a predetermined number of turns. In this case, the fourth coil pattern 62 may be formed so as not to pass through the central region of the fifth sheet 60. For example, the fourth coil pattern 62 may have a predetermined width and interval, and may be formed in a rectangle that rotates outward in a counterclockwise direction, but is not limited thereto.

In addition, the end of the fourth coil pattern 62 is connected to the first lead electrode 66. The first lead electrode 66 is formed to have a predetermined width and is formed to be exposed to one side of the fifth sheet 60. For example, the first withdrawal electrode 66 is formed extending in the short side direction of the fifth sheet 60, and is spaced apart from the first withdrawal electrode 56 formed on the third sheet 50 by a predetermined distance, and is separated from the second sheet ( It is formed to form a straight line with the first lead electrode 36 formed in 30).

In the circuit protection device according to an embodiment of the present invention as described above, the third and first coil patterns 22 and 32 are formed on the upper side with the first sheet 40 on which the capacitor electrodes 42 and 46 are formed. The fourth and second sheets 20 and 30 are formed, respectively, and the third and fifth sheets 50 and 60 are formed on the lower side of the second and fourth coil patterns 52 and 62, respectively.

In addition, the third coil pattern 22 of the fourth sheet 20 passes through the holes 38 of the second sheet 30 and the holes 48 of the first sheet 40 to the second of the third sheet 50. It is connected to the coil pattern 52, and the first coil pattern 32 of the second sheet 30 is removed through the hole 44 of the first sheet 40 and the hole 54 of the third sheet 50. 5 It is connected to the fourth coil pattern 62 of the sheet 60.

That is, the third coil pattern 22 on the upper side of the first sheet 40 is connected to the second coil pattern 52 on the lower side, and the first coil pattern 32 on the upper side of the first sheet 40 is 4 It is connected to the coil pattern 62.

In other words, two coil patterns are respectively formed on the upper and lower sides of the first sheet 40 on which a pair of capacitor electrodes are formed, and one coil pattern on the upper side is connected to one coil pattern on the lower side.

Accordingly, in the circuit protection device according to the present invention, the second coil pattern 52 connected to the third coil pattern 22 constitutes the first inductor, and the fourth coil pattern 62 connected to the first coil pattern 32 This second inductor is formed.

In addition, in the circuit protection element according to the present invention, a pair of capacitor electrodes 42 and 46 are formed between the second and third sheets 30 and 50, so that the pair of capacitor electrodes 42 and 46 and the first coil A pair, that is, two first capacitors are formed between the patterns 32, and a pair, that is, two second capacitors, are formed between the pair of capacitor electrodes 42 and 46 and the second coil pattern 52 do. Consequently, the circuit protection device according to the present invention includes two inductors and two pairs, that is, four capacitors each connected to them.

In this case, the capacitance of the circuit protection device according to the present invention may be adjusted according to the area of the pair of capacitor electrodes 42 and 46. Meanwhile, some of the capacitor electrodes 42 and 46 may be formed to be exposed to one side of the first sheet 40. For example, some of the capacitor electrodes 42 and 46 may be exposed to one side to be formed as the second lead electrodes 43 and 47, and the pair of second lead electrodes 43 and 47 is a first sheet It may be formed to be exposed to one area of both short sides of 40, respectively.

The area of the coil pattern relative to the area of the pair of capacitor electrodes 42 and 46 may be, for example, 1 to 100%.

The circuit protection device according to an embodiment of the present invention can control the inductance and capacitance by adjusting the number of turns of the coil pattern, the area of the capacitor electrode, and the spacing between the coil patterns, that is, the thickness of a plurality of sheets, and is suppressed accordingly. You can adjust the noise of the available frequency.

For example, reducing the thickness of a plurality of sheets can suppress noise in a low frequency band, and increasing the thickness can suppress noise in a high frequency band.

In this way, a circuit protection element composed of two inductors and four capacitors, that is, a common mode noise filter, can suppress noise in two frequency bands and exhibit better performance.

3 is a characteristic graph comparing characteristics of a circuit protection device according to an embodiment of the present invention and a conventional circuit device. 4 is a graph of characteristics according to a ratio of a capacitor area to a pattern area of a circuit protection device according to an embodiment of the present invention.

In FIG. 3, the red graph (A) is the case where there is no capacitor, the blue graph (B) and the green graph (D) are the case where there is a capacitor at both ends, and the black graph (C) is the case where there is only one capacitor at one end. In FIG. 4, the red graph (E) and the blue graph (B) show a case where there are capacitors at both ends. At this time, in each graph, the area of the capacitor, the area of the coil pattern, and the area of the capacitor relative to the area of the coil pattern and the insertion loss are shown in Table 1 below.

A B C D E CP area compared to pattern area 0% 82% 53% 62% 35% Insertion loss -28dB -53dB -47dB -39dB -32dB

At this time, referring to Table 1, it can be seen that the insertion loss is lower in the case of the capacitor (B, C, D) than the case of the absence of the capacitor (A), so that the performance is good.

In addition, compared to the case where there is one capacitor (C), when there is a pair of capacitor electrodes, and the area of the capacitor pattern is 70% or more, more preferably 80%, compared to the coil pattern area (B), there is one capacitor. It can be confirmed experimentally that the insertion loss is smaller than that of the case (C). In this case, the coil pattern area may be less than 90%.

On the other hand, as can be seen in FIG. 4, when the capacitor area is 35% compared to the coil pattern area (E), since the insertion loss has two peak values, a device capable of suppressing noise in two frequency bands can be provided. have. In this case, preferably, when the area of the coil pattern is 25% or more and less than 45% relative to the area of the pair of capacitor electrodes, a device capable of suppressing two or more frequency band noise may be provided.

The circuit protection device according to an embodiment of the present invention can exhibit better performance compared to the circuit protection device having one capacitor, and can suppress noise in two or more frequency bands according to the area ratio of the capacitor and the coil pattern. have.

Accordingly, the circuit protection device according to an embodiment of the present invention may be used in a portable electronic device such as a smart phone employing functions of various frequencies to improve the quality of the electronic device.

Although an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same idea. It will be possible to easily propose other embodiments by changing, deleting, adding, etc., but it will be said that this is also within the scope of the present invention.

1 upper cover layer 2 lower cover layer
10 Common mode noise filter 20 4th sheet
22 3rd coil pattern 28 34 38 44 48 54 58 64 hole
26 36 56 66 1st lead electrode 30 2nd sheet
32 1st coil pattern 40 1st sheet
42 46 Capacitor electrode 43 47 Second lead electrode
50 Third sheet 52 Second coil pattern
60 5th sheet 62 4th coil pattern

Claims (11)

A first sheet on which a pair of capacitor electrodes are formed;
A second sheet positioned above the first sheet and having a first coil pattern formed thereon;
A third sheet positioned under the first sheet and having a second coil pattern formed thereon;
A fourth sheet positioned above the second sheet and having a third coil pattern formed thereon, and
And a fifth sheet positioned under the third sheet and having a fourth coil pattern formed thereon,
The first coil pattern and the fourth coil pattern are connected through holes in which the conductive material formed in the first sheet and the third sheet is buried to form a first inductor,
The second coil pattern and the third coil pattern are connected through holes in which the second sheet and the conductive material formed in the first sheet are buried to form a second inductor,
Four capacitors are formed between the pair of capacitor electrodes and the first and second coil patterns,
The area of the first to fourth coil patterns relative to the area of the pair of capacitor electrodes is 25% or more and less than 45%,
Circuit protection device with two peak values with an insertion loss of -30dB or less in a frequency band of 1GHz or more. The method of claim 1,
The pair of capacitor electrodes are formed symmetrically with respect to a central portion of the first sheet. The method of claim 1,
The pair of capacitor electrodes are formed in the same shape as each other, circuit protection element. The method of claim 1,
Each of the pair of capacitor electrodes has a shape including a quadrangular shape, a polygonal shape including a rounded corner shape, a circular shape, an oval shape, a spiral shape, and a serpentine shape. The method of claim 1,
Inductance and capacitance are adjusted according to at least one of the number of turns of the coil pattern, the area of the capacitor electrode, and a distance between the capacitor electrode and the coil pattern. delete delete delete delete The method of claim 1,
First lead-out electrodes respectively connected to the first to fourth coil patterns and exposed to the outside of the second to fifth sheets, respectively,
The circuit protection device further comprises second lead electrodes connected to the pair of capacitor electrodes and exposed to the outside of the first sheet. The method of claim 10,
A first external electrode connected to the first withdrawal electrodes and formed on side surfaces of the first to fifth sheets, and a first external electrode connected to the second withdrawal electrode and formed on the side surfaces of the first to fifth sheets. 2 further comprising an external electrode,
The first external electrode is connected between an input/output terminal and a circuit, and the second external electrode is connected to a ground terminal.

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