JP2006186210A - Common-mode choke coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a common-mode choke coil component capable of suppressing a distortion of a signal waveform caused by energization. <P>SOLUTION: The common-mode choke coil component comprises a construction with a plurality of electrodes for external connection provided on the side of a laminated body which is laminated by a conductive pattern M for forming the coil and a magnetic layer alternately laminated. Outgoing conductive patterns 3b, 3c (3i, 3j) for respectively connecting the both end parts of the common-mode choke coil comprising the conductive pattern M for forming the coil to the predetermined electrodes for external connection of the other side are provided within the laminated body. At least one side of the outgoing conductive patterns 3b, 3c (3i, 3j) of the both ends of the common-mode choke coil has a thinner conductive pattern width than that of the conductive pattern M for forming the coil and has an inductance for suppressing a generation of the signal waveform distortion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a common mode choke coil component that removes common mode noise flowing in a differential line.

  As shown in FIG. 7, the differential line 32 including the paired lines 30 and 31 arranged in parallel with each other with a gap has common mode noise that causes electromagnetic noise radiation due to various causes. It will flow. For this reason, the common mode is often removed by providing the common line choke coil 33 in the differential line 32. An example of a common mode choke coil component is shown in a schematic external perspective view in FIG. 6A, and a schematic exploded view of the common mode choke coil component in FIG. 6A is shown in FIG. 6B. (For example, refer to Patent Document 1).

  The common mode choke coil component 1 shown in FIG. 6A has a magnetic layer 2 (2a to 2k) and a conductive layer 3 (3b, 3c, 3e to 3j) alternately laminated on the side surface of the laminate K. The external connection electrodes 4 (4A, 4B) and 5 (5A, 5B) are formed. In the common mode choke coil component 1, the conductor patterns 3e and 3g are electrically connected via the via holes 6 formed in the magnetic layers 2f and 2g to form a first coil. The conductor patterns 3f and 3h are electrically connected through via holes 7 formed in the magnetic layers 2g and 2h to form a second coil. The first coil composed of the conductor patterns 3e and 3g and the second coil composed of the conductor patterns 3f and 3h form a pair to constitute the common mode choke coil 8.

  One end side (end portion on the conductor pattern 3e side) of the first coil is connected to the conductor pattern 3b through a via hole 10 formed in the magnetic layers 2c, 2d, and 2e, and the conductor pattern 3b is connected to the outside. It is electrically connected to the connection electrode 4B. Further, the other end side (end portion on the conductor pattern 3g side) of the first coil is connected to the conductor pattern 3i through the via hole 11 formed in the magnetic layers 2h and 2i, and the conductor pattern 3i It is electrically connected to the external connection electrode 4A.

  One end side (the end portion on the conductor pattern 3f side) of the second coil is connected to the conductor pattern 3c through the via hole 12 formed in the magnetic layers 2d, 2e, and 2f, and the conductor pattern 3c is used to externally connect the second coil. It is electrically connected to the connection electrode 5B. The other end side (end portion on the conductor pattern 3h side) of the second coil is connected to the conductor pattern 3j through the via hole 13 formed in the magnetic layers 2i and 2j. It is electrically connected to the external connection electrode 5A.

  The common mode choke coil component 1 shown in FIG. 6 is configured as described above. The common mode choke coil component 1 includes, for example, a pair of lines 30 and 31 as shown in FIG. The differential line 32 is provided. In other words, each of the lines 30 and 31 of the differential line 32 is provided with a dividing portion at the common mode choke coil component disposition portion, and externally connected to the left end side of the dividing portion of the line 30 shown in FIG. The electrode 5A for connection is connected, and the external connection electrode 5B is connected to the right end side of the dividing portion of the line 30. Further, the external connection electrode 4A is connected to the left end side of the dividing portion of the line 31, and the external connection electrode 4B is connected to the right end side of the dividing portion of the line 31.

  The energizing current of the line 31 of the differential line 32 flows, for example, from the external connection electrode 4A into the first coil inside the common mode choke coil component 1, and from the first coil to the line 31 via the external connection electrode 4B. Flows out. The energization current of the line 30 flows from the external connection electrode 5B into the second coil inside the common mode choke coil component 1, for example, and flows out from the second coil to the line 32 through the external connection electrode 5A. As described above, the energizing currents of the lines 30 and 31 energize the first coil or the second coil of the common mode choke coil component 1, respectively, and energize the first coil or the second coil. The common mode noise of the differential line 32 is removed.

JP 7-37734 A JP-A-8-79190

  By the way, since signals of various frequencies are passed through the differential line 32, the characteristic impedance of the common mode choke coil component 1 is constant over a preset frequency range including the frequencies of the signals, The characteristic impedance is preferably the same value as the characteristic impedance of the differential line 32 in order to achieve impedance matching with the differential line 32. However, the common mode choke coil component 1 as shown in FIG. 6 has an impedance characteristic that the characteristic impedance deviates from the value of the characteristic impedance of the differential line 32 on the higher frequency side in the set frequency range. Sometimes. For this reason, impedance mismatch between the common mode choke coil component 1 and the differential line 32 occurs with respect to a signal on the higher frequency side in the set frequency range, thereby passing through the common mode choke coil component 1. The problem arises that the waveform of the generated signal is distorted.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a common mode choke coil component that can suppress the occurrence of signal waveform distortion due to energization of the common mode choke coil component. There is.

  In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the present invention is a common mode choke coil component having a configuration in which a plurality of electrodes for external connection are provided on the side surface of a laminated body in which coil-forming conductor patterns and magnetic layers are alternately laminated. In the laminated body, lead conductor patterns for connecting both end portions of the common mode choke coil constituted by the coil forming conductor patterns to predetermined external connection electrodes are provided. And at least one of the lead conductor patterns on both ends of the common mode choke coil has a narrower conductor pattern width than the coil forming conductor pattern, and signals caused by energization of the common mode choke coil components The conductor pattern for preventing signal waveform distortion has an inductance to suppress the occurrence of waveform distortion. It is a symptom.

  The present invention also provides a common mode choke coil component having a configuration in which a plurality of external connection electrodes are provided on a side surface of a laminate in which a coil forming conductor pattern and a magnetic layer are alternately laminated. The laminated body includes a coil connecting conductor pattern for connecting a plurality of common mode choke coils configured in series with a coil forming conductor pattern, and both ends of a series connection circuit of the common mode choke coils. And a lead conductor pattern for connecting each part to a predetermined external connection electrode for connection, at least one of the lead conductor patterns on both ends of the common mode choke coil, and a coil connection Each conductor pattern is a narrower conductor pattern than the coil-forming conductor pattern. It is characterized also in that the signal waveform distortion prevents conductor pattern having an inductance for suppressing the generation of a signal waveform distortion due to energization mode choke coil component.

  Furthermore, the present invention is characterized in that the signal waveform distortion preventing conductor pattern is formed in a shape having at least one bent portion or is in a spiral shape.

  According to the present invention, inside the common mode choke coil component, the lead conductor pattern for connecting the end of the common mode choke coil and the external connection electrode is provided with inductance, and the lead conductor pattern is used as a signal. It has a configuration as a conductor pattern for preventing waveform distortion. That is, it is desirable that the characteristic impedance of the common mode choke coil is constant to a set value based on the characteristic impedance of the differential line to be incorporated over the entire range of the predetermined frequency range. On the higher frequency side, the characteristic impedance of the common mode choke coil may deviate from the set value. In such a case, in the present invention, since the lead conductor pattern is provided with an inductance, the inductance can be corrected so as to reduce or eliminate the deviation from the set value of the characteristic impedance of the common mode choke coil. As a result, when the entire common mode choke coil component is viewed, the set value for matching the characteristic impedance of the common mode choke coil component with the differential line over the entire range of the set frequency range, or It can be set to a value within an allowable range for the set value. For this reason, since the common mode choke coil component can suppress impedance mismatching with the differential line, generation of signal waveform distortion caused by energizing the common mode choke coil component can be suppressed to a small level. .

  Further, according to the present invention, since the width of the conductor pattern is made narrower than that of the coil forming conductor pattern so that the lead conductor pattern has inductance, the area required for forming the lead conductor pattern is increased. Without this, the lead conductor pattern can have an inductance. That is, it is possible to provide a common mode choke coil component that can prevent the occurrence of the signal waveform distortion as described above while avoiding an increase in size of the common mode choke coil component.

  Further, when it is desired to provide the lead conductor pattern with a larger inductance, the lead conductor pattern is formed to be thinner than the coil forming conductor pattern, and the shape thereof is changed to a shape having one or more bent portions, or a spiral shape. By adopting the shape, the lead conductor pattern can have a larger inductance while avoiding an increase in size of the common mode choke coil component.

  Furthermore, a plurality of common mode choke coils are connected in series via the coil connecting conductor pattern inside the common mode choke coil component, and the coil connecting conductor pattern and the common mode choke coil in a series connection circuit are connected. Even if the lead conductor pattern on at least one of both end sides is made thinner than the coil forming conductor pattern and has an inductance, the common mode choke coil component is similar to the above. The common mode choke coil component can be impedance-matched to the differential line over the entire frequency range set in advance while avoiding an increase in size, thereby energizing the common mode choke coil component. It is possible to suppress the distortion of the signal waveform due to.

  Embodiments according to the present invention will be described below with reference to the drawings. In the description of the embodiment described below, the same components as those of the common mode choke coil component 1 shown in FIG. 6 are denoted by the same reference numerals, and redundant description of the common portions is omitted.

  The common mode choke coil component 1 of the first embodiment has a configuration substantially similar to that of the common mode choke coil component shown in FIGS. 6A and 6B, and the magnetic layer 2 (2a to 2k) and A plurality of external connection electrodes 4 (4A, 4B), 5 (5A, 5B) are formed on the side surface of the laminate K in which the conductor patterns 3 (3b, 3c, 3e-3j) are alternately laminated. Yes. In the common mode choke coil component 1, the conductor patterns 3e to 3h are coil forming conductor patterns for forming the common mode choke coil 8, and the remaining conductor patterns 3b, 3c, 3i, and 3j are lead conductor patterns. . In the first embodiment, each of the lead conductor patterns 3b, 3c, 3i, 3j has a length of 0.1 mm or more.

  In the first embodiment, the lead conductor patterns 3i and 3j provided on one end side of the common mode choke coil 8, and the lead conductor patterns 3b and 3c provided on the other end side of the common mode choke coil 8 are provided. As shown in the image diagram of FIG. 1 (a), at least one side is formed narrower than the coil forming conductor pattern M (3e to 3h) and has an inductance. For this reason, in the equivalent circuit of the common mode choke coil component 1 of the first embodiment, only the lead conductor patterns 3i and 3j (or 3b and 3c) on one end side of the common mode choke coil 8 have inductance. For example, when the circuit shown in FIG. 2A is provided and the lead conductor patterns 3b, 3c, 3i, and 3j on both ends of the common mode choke coil 8 have inductances, respectively, The circuit is as shown in FIG.

  In the first embodiment, the lead conductor pattern having inductance is a signal waveform distortion preventing conductor pattern, and the inductance of the signal waveform distortion preventing conductor pattern is the characteristic impedance of the common mode choke coil component 1 as a whole. Is a characteristic impedance of the differential line to be incorporated over the entire range of the predetermined frequency range, or a value (for example, a range of 0.5 nH to 4.0 nH) that is within an allowable range for the impedance. Is set to a very small inductance value). Thereby, since impedance matching between the common mode choke coil component 1 and the differential line can be improved, it is possible to suppress the occurrence of distortion of the signal waveform due to energization of the common mode choke coil component 1.

  This has been confirmed by the inventors' experiments. FIG. 3 shows the experimental results. The graph of FIG. 3 shows the relationship between the characteristic impedance of the common mode choke coil component 1 and the signal frequency obtained by experiment. The solid line A is a signal waveform distortion preventing conductor peculiar to the first embodiment. Regarding the common mode choke coil component 1 having a pattern, the dotted line B relates to the common mode choke coil component 1 having no conductor waveform for preventing signal waveform distortion. This experiment is performed under the same conditions except for the presence / absence of formation of a signal waveform distortion preventing conductor pattern, and the common mode choke coil 8 of the common mode choke coil component 1 is based on one of the differential transmission standards. The characteristic impedance is designed to be 100Ω, and the allowable range is up to ± 20Ω with respect to the characteristic impedance (100Ω).

  As shown in the graph of FIG. 3, by forming a signal waveform distortion preventing conductor pattern, a common mode choke over the entire frequency range (for example, 500 MHz to 2.5 GHz) set in advance. The characteristic impedance of the coil component 1 can be within an allowable range.

  In addition, the inventor has obtained an eye pattern of a signal energizing a differential line that has passed through the common mode choke coil component 1 by experiment, and the experimental result is shown in FIGS. 4 (a) and 4 (b). Has been. FIG. 4A relates to a common mode choke coil component 1 having a conventional configuration in which no signal waveform distortion preventing conductor pattern is provided, and FIG. 4B illustrates signal waveform distortion prevention peculiar to the first embodiment. The present invention relates to a common mode choke coil component 1 provided with a conductive pattern. As can be seen from the comparison between FIGS. 4A and 4B, the eye pattern is improved by providing the signal waveform distortion preventing conductor pattern. This also suppresses the distortion of the signal waveform. I understand that

  In the example of FIG. 1A, the signal waveform distortion preventing conductor pattern is provided with inductance only by making the conductor pattern width narrower than the coil forming conductor pattern. When it is desired to give the signal waveform distortion preventing conductor pattern a larger inductance while suppressing an increase in the size of the choke coil component 1, for example, as shown in FIG. In addition to narrowing the width, the signal waveform distortion preventing conductor pattern may have a shape having at least one bent portion, or may have a spiral shape as shown in FIG. The shape of the conductor pattern for use is not limited to a linear shape, and can take an appropriate shape. When the signal waveform distortion preventing conductor pattern is formed in a spiral shape as shown in FIG. 1C, the signal waveform distortion preventing conductor pattern includes a plurality of conductors formed over a plurality of layers. A pattern and via holes for connecting the conductor patterns are provided.

  The second embodiment will be described below. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and overlapping description of the common portions is omitted.

  The common mode choke coil component 1 of the second embodiment has an equivalent circuit as shown in FIG. That is, in the common mode choke coil component 1 of the second embodiment, a plurality of common mode choke coils 17 (17a, 17b) including the coil forming conductor pattern 16 are arranged in the laminated body K. 18 are connected in series. Lead conductor patterns 22 (for connection to external connection electrodes 20 (20a, 20b), 21 (21a, 21b) are respectively provided at both ends of the series connection circuit of the common mode choke coils 17 (17a, 17b). 22a-22d) are provided. At least one side (both in the example of FIG. 5) of the lead conductor patterns 22a and 22b on one end side of the series connection circuit and the lead conductor patterns 22c and 22d on the other end side of the series connection circuit, and coil connection The conductor pattern 18 has an inductance and forms a signal waveform distortion preventing conductor pattern.

  Also in the second embodiment, similarly to the first embodiment, the signal waveform distortion preventing conductor pattern constituted by the lead conductor pattern 22 and the coil connecting conductor pattern 18 is the common mode choke coil component 1. Designed to have an inductance (for example, a small inductance value in the range of 0.5 nH to 4.0 nH) for impedance matching to the differential line over the entire frequency range of setting. Yes. For this reason, also in this 2nd embodiment, the same outstanding effect as a 1st embodiment can be acquired.

  In addition, this invention is not limited to the form of each 1st or 2nd embodiment, Various embodiments can be taken. For example, the lead conductor pattern is formed in a layer different from the coil forming conductor pattern. For example, when the restriction of the occupation area of the common mode choke coil component 1 on the circuit board is loose, the magnetic layer 2 The coil forming conductor pattern and the lead conductor pattern may be formed in the same layer by expanding the area.

  Of course, the number of turns and the shape of the common mode choke coil constituted by the coil forming conductor pattern are not limited to the illustrated example, but may be set as appropriate.

It is a figure for demonstrating the structure part peculiar in the common mode choke coil components of the example of 1st Embodiment. It is a circuit diagram for demonstrating the equivalent circuit of the common mode choke coil component of 1st Embodiment. It is a graph of the experimental result for demonstrating the effect acquired from the structure peculiar in the example of 1st Embodiment. FIG. 4 is a diagram for explaining the effects obtained from the unique configuration in the first embodiment together with FIG. 3. It is a circuit diagram for demonstrating the equivalent circuit of the common mode choke coil components of 2nd Embodiment. It is a model figure for demonstrating one structural example of a common mode choke coil component. It is a figure for demonstrating the example of a relationship between a differential track | line and a common mode choke coil component.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,15 Common mode choke coil components 2 Magnetic layer 3 Conductor pattern 4, 5, 20, 21 Electrode for external connection 8, 17 Common mode choke coil 18 Conductor pattern for coil connection

Claims (4)

  A common mode choke coil component having a configuration in which a plurality of external connection electrodes are provided on a side surface of a laminate in which coil-forming conductor patterns and magnetic layers are alternately laminated. Is provided with a lead conductor pattern for connecting both ends of the common mode choke coil constituted by the coil forming conductor pattern to a predetermined connection partner external connection electrode. At least one of the lead conductor patterns on both ends of the choke coil is narrower than the coil forming conductor pattern to suppress signal waveform distortion caused by energization of common mode choke coil components Common mode characterized by a conductor pattern for preventing signal waveform distortion with inductance Yokukoiru parts.   A common mode choke coil component having a configuration in which a plurality of external connection electrodes are provided on a side surface of a laminate in which coil-forming conductor patterns and magnetic layers are alternately laminated. The coil connecting conductor pattern for connecting a plurality of common mode choke coils configured in series with the coil forming conductor pattern and both ends of the common mode choke coil series connecting circuit are respectively determined in advance. A lead conductor pattern for connection to the external connection electrode of the connection partner, at least one of the lead conductor patterns on both ends of the common mode choke coil, and the coil connecting conductor pattern, Reduce the width of the conductor pattern to be smaller than that of the coil forming conductor pattern. Common mode choke coil component, characterized in that the inductance and the signal waveform distortion prevents conductor patterns having for suppressing the generation of a signal waveform distortion due to energization of Le component.   3. The common mode choke coil component according to claim 1, wherein the signal waveform distortion preventing conductor pattern has a shape having at least one bent portion.   3. The common mode choke coil component according to claim 1, wherein the signal waveform distortion preventing conductor pattern has a spiral shape.

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