JP6753164B2 - Noise suppression parts and noise suppression modules - Google Patents

Description

The present invention relates to a noise suppression component including a common mode choke coil and a noise suppression module.

Conventionally, for example, a common mode choke coil having a pair of coils wound in the same direction has been used in order to suppress common mode noise that has entered a differential transmission line that transmits a signal. Since the common mode choke coil has a high common mode impedance and a low differential mode (normal mode) impedance, the common mode noise is removed and the differential mode signal is passed through.

For example, in Patent Document 1, a pulse transformer and an auto transformer are provided in the same package in addition to the common mode choke coil, and the pulse transformer is connected to one side (signal generation processing side) of the common mode choke coil. A transformer module in which an auto transformer is connected to the other side (transmission line side) of the choke coil is disclosed.

Japanese Unexamined Patent Publication No. 2003-188020

By the way, the common mode choke coil may convert a differential mode component (for example, a differential mode signal, a differential mode noise) into a common mode component depending on the mode conversion characteristic (for example, depending on the mounting position of the common mode choke coil). Mode conversion may occur in the frequency band), which may increase common mode mode noise. In the transformer module disclosed in Patent Document 1, when a differential mode component is input to the common mode choke coil from the signal generation processing side, even if this differential mode component is mode-converted to common mode noise by the common mode choke coil, this mode Common mode noise due to conversion can be suppressed by an auto transformer.

However, in the transformer module disclosed in Patent Document 1, when a differential mode component is input to the common mode choke coil from the transmission line side, the differential mode component is mode-converted to common mode noise by the common mode choke coil. Common mode noise due to mode conversion cannot be suppressed.

The present invention has been made to solve the above problems, and it is possible to suppress common mode noise due to mode conversion and intrude even when a differential mode component is input from any side of the common mode choke coil. It is an object of the present invention to provide a noise suppression component and a noise suppression module capable of improving the suppression effect of common mode noise.

The noise countermeasure component according to the present invention includes a common mode choke coil having a first coil and a second coil, a first auto transformer having a coil and an intermediate tap provided in the middle portion of the coil, and a coil. Then, the second auto transformer provided with an intermediate tap in the middle part of the coil and one end of the first coil of the common mode choke coil are electrically connected, and one end of the coil of the first auto transformer is electrically connected. The second external electrode is electrically connected to one end of the second coil of the common mode choke coil, and the other end of the coil of the first auto transformer is electrically connected. The electrode, the third external electrode to which the other end of the first coil of the common mode choke coil is electrically connected and one end of the coil of the second auto transformer are electrically connected, and the common mode choke coil. The fourth external electrode, which is electrically connected to the other end of the second coil and the other end of the coil of the second auto transformer, is electrically connected to the intermediate tap of the first auto transformer. It is characterized by including a fifth external electrode to be formed and a sixth external electrode to which the intermediate tap of the second auto transformer is electrically connected.

The noise countermeasure component according to the present invention connects a first auto transformer between one end of the first coil of the common mode choke coil and one end of the second coil, and also connects the other end of the first coil of the common mode choke coil. By connecting a second auto transformer between the other ends of the second coil, auto transformers are provided on both sides of the common mode choke coil. Therefore, when the differential mode component is input from one side (first auto transformer side) of the noise suppression component, even if the differential mode component is mode-converted to the common mode noise by the common mode choke coil, this common mode noise is converted to the common mode noise. 2 It can be suppressed by an auto transformer. Further, when the differential mode component is input from the other side (second auto transformer side) of the noise suppression component, even if the differential mode component is mode-converted to the common mode noise by the common mode choke coil, this common mode noise is converted to the common mode noise. It can be suppressed by 1 auto transformer. As described above, according to the noise suppression component according to the present invention, it is possible to suppress the common mode noise due to the mode conversion even when the differential mode component is input from any side of the common mode choke coil. Further, according to the noise suppression component according to the present invention, since two auto transformers are provided in addition to the common mode choke coil, two auto transformers are provided in addition to the common mode choke coil when common mode noise invades. The common mode noise can be removed by the auto transformer, and the effect of suppressing the common mode noise can be improved.

Further, according to the noise suppression component according to the present invention, since it has a symmetrical structure in which auto transformers are provided on both sides of the common mode choke coil, it can be mounted without considering the directionality of the component and has excellent mountability. ing. Further, according to the noise suppression component according to the present invention, since one common mode choke coil and two auto transformers are integrated as a composite component, the size can be reduced.

In the noise suppression component according to the present invention, the common mode choke coil includes a first magnetic core composed of a first winding core portion and a first flange portion and a second flange portion provided at both ends of the first winding core portion. , The first winding wound around the first winding core, the second winding wound around the first winding core in the same winding direction as the first winding, and the top surface of the first flange. The first auto transformer is composed of a second winding core portion and a first top plate erected between the top surfaces of the second winding core portion, and the first coil portion provided at both ends of the second winding core portion and the second winding core portion. A second magnetic core composed of a third flange portion, a third winding wound around the second winding core portion, and a winding core portion wound around the second winding core portion in a winding direction opposite to that of the third winding. The second auto transformer is composed of a fourth winding and a second top plate erected between the top surface of the first flange portion and the top surface of the third flange portion, and the second auto transformer is the third winding core portion and the first. A third magnetic core composed of a second flange portion and a fourth flange portion provided at both ends of the third winding core portion, a fifth winding wound around the third winding core portion, and a third winding core portion. It is composed of a sixth winding that is wound in the winding direction opposite to that of the fifth winding, and a third top plate that is erected between the top surface of the second flange and the top surface of the fourth flange. The first external electrode is provided on the bottom surface of the first flange portion, one end of the first winding is electrically connected and one end of the third winding is electrically connected, and the second external electrode is , One end of the second winding is electrically connected and one end of the fourth winding is electrically connected, and the third external electrode is the second flange. The other end of the first winding is electrically connected and one end of the fifth winding is electrically connected, and the fourth external electrode is provided on the bottom surface of the second flange. The other end of the second winding is electrically connected and one end of the sixth winding is electrically connected, and the fifth external electrode is provided on the bottom surface of the third flange. The other end of the winding is electrically connected and the other end of the fourth winding is electrically connected, and the sixth external electrode is provided on the bottom surface of the fourth flange of the fifth winding. It is preferable that the other end is electrically connected and the other end of the sixth winding is electrically connected.

With such a structure, it is possible to configure a winding type noise suppression component in which auto transformers are provided on both sides of the common mode choke coil. In the case of the winding type, the high frequency characteristics of the noise suppression component are excellent, and the effect of suppressing common mode noise in the high frequency band can be improved.

In the noise suppression component according to the present invention, the first top plate and the second top plate are arranged at a predetermined interval on the top surface of the first flange portion, and the first top plate and the third top plate are It is preferable that they are arranged at predetermined intervals on the top surface of the second flange portion. With such a structure, since there are gaps between the first top plate and the second top plate and between the first top plate and the third top plate, magnetic coupling between the common mode choke coil and each auto transformer is performed. Can be suppressed.

In the noise suppression component according to the present invention, the first winding, the third winding, and the fifth winding are composed of the same wire, and the second winding, the fourth winding, and the sixth winding are the same. It is preferably composed of wires. With such a structure, it is easy to manufacture a winding type noise suppression component, and productivity can be improved.

In the noise suppression component according to the present invention, the common mode choke coil includes a first non-magnetic layer, a pair of first coil patterns and a second coil pattern laminated with the first non-magnetic layer sandwiched between them, and the pair. The first autotransformer is composed of a pair of a first magnetic layer and a second magnetic layer laminated with the first coil pattern and the second coil pattern interposed therebetween, and the first auto transformer has a second non-magnetic layer and the second non-magnetic layer. By the pair of the third coil pattern and the fourth coil pattern laminated with the third coil pattern and the fourth coil pattern, and the pair of the third magnetic layer and the fourth magnetic layer laminated with the pair of the third coil pattern and the fourth coil pattern interposed therebetween. The second auto transformer is configured, and includes a third non-magnetic layer, a pair of fifth coil patterns and a sixth coil pattern laminated with the third non-magnetic layer interposed therebetween, and the pair of fifth coil patterns and the third coil pattern. The first external electrode is composed of a pair of a fifth magnetic layer and a sixth magnetic layer that are laminated with the six coil patterns interposed therebetween, and one end of the first coil pattern is electrically connected and the third coil pattern is formed. One end of the second external electrode is electrically connected, and one end of the second coil pattern is electrically connected and the other end of the fourth coil pattern is electrically connected to the second external electrode. The other end of the first coil pattern is electrically connected and one end of the fifth coil pattern is electrically connected, and the other end of the second coil pattern of the fourth external electrode is electrically connected. At the same time as being connected, the other end of the 6th coil pattern is electrically connected, and the other end of the 3rd coil pattern is electrically connected to the 5th external electrode and one end of the 4th coil pattern is electrically connected. It is preferable that the other end of the fifth coil pattern is electrically connected and one end of the sixth coil pattern is electrically connected to the sixth external electrode.

With such a structure, it is possible to configure a laminated noise suppression component in which auto transformers are provided on both sides of the common mode choke coil. In the case of the laminated type, the noise suppression component can be miniaturized.

In the noise suppression component according to the present invention, the first auto transformer is laminated on the upper side of the common mode choke coil in the stacking direction, and the second auto transformer is laminated on the lower side of the coil mode choke coil in the stacking direction. The laminated body is formed, a first external electrode, a second external electrode and a fifth external electrode are provided on one side surface of the laminated body, and a third external electrode is provided on the other side surface facing one side surface of the laminated body. It is preferable that the fourth external electrode and the sixth external electrode are provided. With such a structure, the noise suppression component can be further miniaturized.

The noise suppression module according to the present invention has a common mode choke coil having a first coil and a second coil, a first auto transformer having a coil and an intermediate tap provided in the middle portion of the coil, and a coil. A second auto transformer with an intermediate tap provided in the middle of the coil is provided, and one end of the first coil of the common mode choke coil and one end of the coil of the first auto transformer are electrically connected. Then, one end of the second coil of the common mode choke coil and the other end of the coil of the first auto transformer are electrically connected, and the other end of the first coil of the common mode choke coil and the other end of the second auto transformer are connected. One end of the coil is electrically connected, and the other end of the second coil of the common mode choke coil and the other end of the coil of the second auto transformer are electrically connected.

According to the noise suppression module according to the present invention, similarly to the noise suppression component described above, the differential mode component is generated from either side of the common mode choke coil by the two auto transformers provided on both sides of the common mode choke coil. Even when it is input, common mode noise due to mode conversion can be suppressed. Further, according to the noise suppression module according to the present invention, as with the noise suppression components described above, two auto transformers are provided in addition to the common mode choke coil, so that the effect of suppressing invading common mode noise is also obtained. Can be improved. Further, according to the noise suppression module according to the present invention, since it has a symmetrical structure in which auto transformers are provided on both sides of the common mode choke coil, it can be mounted without considering the directionality of the module and is excellent in mountability. ing.

The noise suppression module according to the present invention includes a first capacitor and a second capacitor, the first capacitor is electrically connected to the intermediate tap of the first auto transformer, and the second capacitor is intermediate between the second auto transformer. It is preferably electrically connected to the tap. With this configuration, common mode noise can flow from the intermediate tap of the first auto transformer to the ground via the first capacitor, and common mode noise from the intermediate tap of the second auto transformer via the second capacitor. Can be flushed to the ground.

According to the present invention, even when the differential mode component is input from any side of the common mode choke coil, the common mode noise due to the mode conversion can be suppressed and the effect of suppressing the invading common mode noise can be improved. It will be possible.

It is a figure which shows the equivalent circuit of the noise suppression component which concerns on embodiment. It is a circuit diagram in the case where the noise suppression component which concerns on embodiment is mounted. It is a figure which shows the comparative example of the mode conversion characteristic Scd12 of the noise suppression component which concerns on embodiment. It is a figure which shows the comparative example of the mode conversion characteristic Scd21 of the noise suppression component which concerns on embodiment. It is a figure which shows the comparative example of the transmission characteristic Scc21 of the noise suppression component which concerns on embodiment. It is a perspective view of the winding type noise suppression component which concerns on 1st Example. It is a noise countermeasure component shown in FIG. 6, (a) is a bottom view, and (b) is a side view. It is a perspective view of the laminated type noise suppression component which concerns on 2nd Example. It is an exploded perspective view of the common mode choke coil of the noise countermeasure component shown in FIG. It is an exploded perspective view of the 1st auto transformer of the noise suppression component shown in FIG. It is an exploded perspective view of the 2nd auto transformer of the noise suppression component shown in FIG. It is an exploded perspective view of the noise suppression component shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the same reference numerals are used for the same or corresponding parts. Further, in each figure, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

First, the noise countermeasure component 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an equivalent circuit of the noise suppression component 1 according to the embodiment.

The noise suppression component 1 is a component provided on the differential transmission line and suppresses noise propagating in the differential transmission line. The noise includes differential mode (normal mode) noise in which noise flows in the opposite direction on a pair of transmission lines of the differential transmission line, and common mode noise in which noise flows in the same direction on the pair of transmission lines. The noise suppression component 1 suppresses common mode noise.

The noise suppression component 1 is a composite component in which the common mode choke coil 10, the first auto transformer 11, and the second auto transformer 12 are integrated. The noise suppression component 1 includes six external electrodes 13 to 18. The noise suppression component 1 is provided with a first auto transformer 11 on one side of the common mode choke coil 10 and a second auto transformer 12 on the other side of the common mode choke coil 10.

The common mode choke coil 10 is a filter that removes common mode noise propagating in the differential transmission line. The common mode choke coil 10 has a pair of a first coil 10a and a second coil 10b, and the two coils 10a and 10b are magnetically coupled.

The common mode choke coil 10 may convert a differential mode component (for example, a differential mode signal or a differential mode noise) into a common mode component depending on the mode conversion characteristic. For example, depending on the position where the common mode choke coil 10 is mounted, the mode may be converted in a specific frequency band (for example, a high frequency band). Therefore, when a differential mode signal (differential signal) is input to the common mode choke coil 10, common mode noise may be increased due to the mode conversion characteristic of the common mode choke coil 10. Therefore, the noise countermeasure component 1 is provided with auto transformers 11 and 12 on both sides of the common mode choke coil 10 in order to suppress the common mode noise due to this mode conversion.

The first auto transformer 11 has a coil 11a, and an intermediate tap 11b is provided in an intermediate portion of the coil 11a. One end 11c of the coil 11a is electrically connected to one end 10c of the first coil 10a of the common mode choke coil 10. The other end 11d of the coil 11a is electrically connected to one end 10d of the second coil 10b of the common mode choke coil 10. In this way, the first auto transformer 11 is connected between one end 10c of the first coil 10a and the one end 10d of the second coil 10b of the common mode choke coil 10. In the first auto transformer 11, the entire coil 11a from one end 11c to the other end 11d is a primary coil, and a part of the coil 11a from the intermediate tap 11b to the other end 11d is a secondary coil.

The second auto transformer 12 has a coil 12a, and an intermediate tap 12b is provided in an intermediate portion of the coil 12a. One end 12c of the coil 12a is electrically connected to the other end 10e of the first coil 10a of the common mode choke coil 10. The other end 12d of the coil 12a is electrically connected to the other end 10f of the second coil 10b of the common mode choke coil 10. In this way, the second auto transformer 12 is connected between the other end 10e of the first coil 10a of the common mode choke coil 10 and the other end 10f of the second coil 10b. In the second auto transformer 12, the entire coil 12a from one end 12c to the other end 12d is the primary coil, and a part of the coil 12a from the intermediate tap 12b to the other end 12d is the secondary coil.

One end 10c of the first coil 10a of the common mode choke coil 10 is electrically connected to the first external electrode 13. Further, one end 11c of the coil 11a of the first auto transformer 11 is electrically connected to the first external electrode 13.

One end 10d of the second coil 10b of the common mode choke coil 10 is electrically connected to the second external electrode 14. Further, the other end 11d of the coil 11a of the first auto transformer 11 is electrically connected to the second external electrode 14.

The other end 10e of the first coil 10a of the common mode choke coil 10 is electrically connected to the third external electrode 15. Further, one end 12c of the coil 12a of the second auto transformer 12 is electrically connected to the third external electrode 15.

The other end 10f of the second coil 10b of the common mode choke coil 10 is electrically connected to the fourth external electrode 16. Further, the other end 12d of the coil 12a of the second auto transformer 12 is connected to the fourth external electrode 16.

An intermediate tap 11b of the first auto transformer 11 is connected to the fifth external electrode 17. An intermediate tap 12b of the second auto transformer 12 is connected to the sixth external electrode 18.

The first external electrode 13, the second external electrode 14, and the fifth external electrode 17 are external electrodes on one side (first auto transformer 11 side) of the common mode choke coil 10, and the third external electrode 15, the fourth external electrode 16 and the sixth external electrode 18 are external electrodes on the other side (second auto transformer 12 side) of the common mode choke coil 10. Further, the first external electrode 13 and the third external electrode 15 are external electrodes connected to one (D +) transmission line of the differential transmission line, and the second external electrode 14 and the fourth external electrode 16 are differential transmission. It is an external electrode connected to the transmission line on the other side (D−) of the line, and the fifth external electrode 17 and the sixth external electrode 18 are, for example, external electrodes connected to the ground via a capacitor.

A case where the noise suppression component 1 is mounted in order to suppress the common mode noise propagating in the differential transmission line 4 will be described with reference to FIG. FIG. 2 is a circuit diagram when the noise suppression component 1 according to the embodiment is mounted.

The differential transmission line 4 is a line that transmits a differential signal (differential mode signal). The differential transmission line 4 is used, for example, as a transmission line for a LAN such as Ethernet (registered trademark). The differential transmission line 4 is composed of a pair of transmission lines 4a and 4b. The differential transmission line 4 is provided with a noise suppression component 1. The differential transmission line 4 may be provided with a pulse transformer for insulation on one side (first auto transformer 11 side) or / and the other side (second auto transformer 12 side) of the noise suppression component 1. ..

When mounting the noise suppression component 1, six external electrodes 13 to 18 are connected as shown below. The first external electrode 13 is electrically connected to one end of the line 4c on one side (first auto transformer 11 side) of one transmission line 4a. The second external electrode 14 is electrically connected to one end of the line 4d on one side of the other transmission line 4b. The other ends of the lines 4c and 4d on one side of the transmission lines 4a and 4b are electrically connected to, for example, the connector 5.

The third external electrode 15 is electrically connected to one end of the line 4e on the other side (second auto transformer 12 side) of one transmission line 4a. The fourth external electrode 16 is electrically connected to one end of the other line 4f of the other transmission line 4b. The other ends of the lines 4e and 4f on the other side of the transmission lines 4a and 4b are electrically connected to, for example, the connector 6. The illustration of other differential transmission lines other than the differential transmission line 4 connected between the connectors 5 and 6 is omitted.

One end 7a (one electrode) of the first capacitor 7 is electrically connected to the fifth external electrode 17. The other end 7b (the other electrode) of the first capacitor 7 is connected to the ground. One end 8a (one electrode) of the second capacitor 8 is connected to the sixth external electrode 18. The other end 8b (the other electrode) of the second capacitor 8 is connected to the ground.

By connecting the six external electrodes 13 to 17 in this way, the first coil 10a of the common mode choke coil 10 of the noise suppression component 1 is provided on one transmission line 4a. The second coil 10b of the common mode choke coil 10 is provided on the other transmission line 4b. The first auto transformer 11 is provided on one side between one transmission line 4a and the other transmission line 4b. The second auto transformer 12 is provided on the other side between one transmission line 4a and the other transmission line 4b. The intermediate tap 11b of the first auto transformer 11 is connected to the ground via the first capacitor 7. The intermediate tap 12b of the second auto transformer 12 is connected to the ground via the second capacitor 8.

The operation of the noise suppression component 1 mounted in this way will be described. A transmission circuit is connected to the terminal to which the differential transmission line 4 of the connector 5 is connected, a reception circuit is connected to the terminal to which the differential transmission line 4 of the connector 6 is connected, and one side of the noise suppression component 1 ( When the differential mode signal is input from the connector 5 side), the noise countermeasure component 1 may convert the differential mode signal into common mode noise by the common mode choke coil 10. In this case, in the noise suppression component 1, the mode-converted common mode noise is passed from the intermediate tap 12b of the second auto transformer 12 to the ground via the second capacitor 8.

On the other hand, the transmission circuit is connected to the terminal to which the differential transmission line 4 of the connector 6 is connected, the reception circuit is connected to the terminal to which the differential transmission line 4 of the connector 5 is connected, and the other side of the noise suppression component 1. When the differential mode signal is input from the side (connector 6 side), the noise countermeasure component 1 may convert the differential mode signal into common mode noise by the common mode choke coil 10. In this case, in the noise suppression component 1, the mode-converted common mode noise is passed from the intermediate tap 11b of the first auto transformer 11 to the ground via the first capacitor 7.

Further, when the common mode noise enters the differential transmission line 4 from the connector 5 side and the common mode noise enters from one side of the noise countermeasure component 1, the noise countermeasure component 1 has the common mode noise in the common mode choke coil 10. To remove. Further, in the noise suppression component 1, common mode noise is passed from the intermediate tap 11b of the first auto transformer 11 to the ground via the first capacitor 7, and the intermediate tap 12b of the second auto transformer 12 is passed through the second capacitor 8. Common mode noise is sent to the ground.

On the other hand, when the common mode noise enters the differential transmission line 4 from the connector 6 side and the common mode noise enters from the other side of the noise suppression component 1, the same as when the common mode noise enters from the connector 5 side. In the noise suppression component 1, the common mode choke coil 10 removes the common mode noise, and the two auto transformers 11 and 12 send the common mode noise to the ground.

The effect of the noise suppression component 1 will be described with reference to FIGS. 3 to 5. Here, the effect will be described by comparing each characteristic between the case where the noise countermeasure component 1 according to the embodiment is used as the noise countermeasure component and the case where the comparison component is used. The comparative component is a composite component composed of one common mode choke coil and one auto transformer, and the auto transformer is provided only on one side of the common mode choke coil. This comparative component is, for example, a noise suppression component without the second auto transformer 12 in the equivalent circuit shown in FIG.

The characteristics to be compared are the mode conversion characteristic Scd12, the mode conversion characteristic Scd21, and the transmission characteristic Scc21. Scd12 is a mode conversion characteristic in which the differential mode component input to the noise suppression component is output as a common mode component, and the input side is the port 2 side (for example, the second auto transformer 12 side) of the noise suppression component and is output. The side is the port 1 side (for example, the first auto transformer 11 side) of the noise suppression component. Scd21 is a mode conversion characteristic in which the differential mode component input to the noise suppression component is output as a common mode component. The input side is the port 1 side of the noise suppression component, and the output side is the port 2 side of the noise suppression component. .. Sc21 is a transmission characteristic in which a common mode component input to the noise suppression component is output as a common mode component, the input side is the port 1 side of the noise suppression component, and the output side is the port 2 side of the noise suppression component.

The smaller Scd12 and Scd21 are, the more difficult it is to convert the mode to a common mode component (it is difficult to output common mode noise). Sc21 indicates that the smaller the value, the more difficult it is for the common mode component to pass through (the more difficult it is for common mode noise to be output).

First, a comparative example of the mode conversion characteristic Scd12 will be described with reference to FIG. FIG. 3 is a diagram showing a comparative example of the mode conversion characteristic Scd12 of the noise suppression component. In FIG. 3, the horizontal axis is frequency (MHz) and the vertical axis is Scd12 (dB). In FIG. 3, the graph shown by the solid line G1 shows Scd12 of the noise suppression component 1 according to the embodiment, and the graph shown by the broken line G2 shows Scd12 of the comparative component. Comparing the graph G1 and the graph G2, the noise countermeasure component 1 and the comparison component according to the embodiment have similar values in substantially all frequency bands shown in FIG. Therefore, in the direction from the port 2 side to the port 1 side, the common mode noise due to the mode conversion is suppressed regardless of whether the noise countermeasure component 1 is used or the comparison component is used. In this case, since both the noise suppression component 1 and the comparison component have an auto transformer on the port 1 side, even if the differential mode component input from the port 2 side is converted into common mode noise by the common mode choke coil, the port 1 side Common mode noise can be suppressed by the auto transformer.

Next, a comparative example of the mode conversion characteristic Scd21 will be described with reference to FIG. FIG. 4 is a diagram showing a comparative example of the mode conversion characteristic Scd21 of the noise suppression component. In FIG. 4, the horizontal axis is frequency (MHz) and the vertical axis is Scs21 (dB). In FIG. 4, the graph shown by the solid line G3 shows the Scd21 of the noise suppression component 1 according to the embodiment, and the graph shown by the broken line G4 shows the Scd21 of the comparative component. Comparing the graph G3 and the graph G4, there is a frequency band (mainly a high frequency band of 10 MHz or more) in which the noise suppression component 1 according to the embodiment has a smaller value than the comparative component. Therefore, in the direction from the port 1 side to the port 2 side, it is better to use the noise suppression component 1 to suppress an increase in common mode noise due to mode conversion. In this case, since the noise suppression component 1 also has an auto transformer on the port 2 side, even if the differential mode component input from the port 1 side is converted into common mode noise by the common mode choke coil, the auto on the port 2 side Common mode noise can be suppressed with a transformer. On the other hand, since the comparative component does not have an auto transformer on the port 2 side, when the differential mode component input from the port 1 side is converted into common mode noise by the common mode choke coil, the common mode noise is suppressed. I can't.

Next, a comparative example of the transmission characteristic Scc21 will be described with reference to FIG. FIG. 5 is a diagram showing a comparative example of the transmission characteristic Scc21 of the noise suppression component. In FIG. 5, the horizontal axis is frequency (MHz) and the vertical axis is Scc21 (dB). In FIG. 5, the graph shown by the solid line G5 shows the Scc21 of the noise suppression component 1 according to the embodiment, and the graph shown by the broken line G6 shows the Scc21 of the comparative component. Comparing the graph G5 and the graph G6, the noise suppression component 1 according to the embodiment has a smaller value in substantially all frequency bands shown in FIG. 5 than the comparative component. Therefore, the common mode noise is removed by using the noise suppression component 1. In this case, since the noise suppression component 1 has one more auto transformer than the comparison component, more common mode noise can be removed. In this comparative example, the transmission characteristics are obtained when the common mode noise is input from the port 1 side of the noise suppression component, but the same transmission characteristics are obtained when the common mode noise is input from the port 2 side of the noise suppression component. Be done.

As can be seen from the comparative example of the two mode conversion characteristics Scd12 and Scd21, when the noise suppression component 1 according to the embodiment is used, the common mode noise due to the mode conversion is suppressed with respect to the input of the differential mode component from both sides. can do. Further, as can be seen from the comparative example of the transmission characteristic Scc21, when the noise countermeasure component 1 according to the embodiment is used, more invading common mode noise can be removed.

According to the noise countermeasure component 1 according to the embodiment, it is possible to suppress the common mode noise due to the mode conversion even when the differential mode component is input from any side of the common mode choke coil 10. Further, according to the noise countermeasure component 1 according to the embodiment, since the two auto transformers 11 and 12 are provided in addition to the common mode choke coil 10, the effect of suppressing the invading common mode noise can be improved. ..

According to the noise suppression component 1 according to the embodiment, since the auto transformers 11 and 12 are provided on both sides of the common mode choke coil 10, it can be mounted without considering the directionality of the component. Excellent in sex. Further, according to the noise suppression component 1 according to the embodiment, since one common mode choke coil 10 and two auto transformers 11 and 12 are integrated as a composite component, the size can be reduced.

Next, with reference to FIGS. 6 and 7, a noise suppression component 2 configured as a winding type will be described as a first embodiment of the noise suppression component 1 according to the embodiment. FIG. 6 is a perspective view of the winding type noise suppression component 2 of the first embodiment. 7A and 7B are the noise suppression component 2 shown in FIG. 6, in which FIG. 7A is a bottom view and FIG. 7B is a side view.

The noise suppression component 2 is a winding type component in which the common mode choke coil 20, the first auto transformer 21, and the second auto transformer 22 are integrated. The noise suppression component 2 includes six first to sixth external electrodes 23 to 28. In the noise suppression component 2, the first auto transformer 21 is arranged on one side of the common mode choke coil 20 in the axial direction, and the second auto transformer 22 is arranged on the other side of the common mode choke coil 20 in the axial direction.

The common mode choke coil 20 is composed of a first magnetic core 40, a first winding 41, a second winding 42, and a first top plate 43. The first magnetic core 40 includes a first winding core portion 44, and a pair of first flange portions 45 and a second flange portion 46.

The first auto transformer 21 is composed of a second magnetic core 50, a third winding 51, a fourth winding 52, and a second top plate 53. The second magnetic core 50 includes a second winding core portion 54, and a pair of first flange portions 45 and a third flange portion 56. The first flange portion 45 is shared by the first auto transformer 21 and the common mode choke coil 20.

The second auto transformer 22 is composed of a third magnetic core 60, a fifth winding 61, a sixth winding 62, and a third top plate 63. The third magnetic core 60 includes a third winding core portion 64, a pair of second flange portions 46, and a fourth flange portion 66. The second flange portion 46 is shared by the second auto transformer 22 and the common mode choke coil 20.

The first to third magnetic cores 40, 50, and 60 are formed of a magnetic material, and are formed of, for example, ferrite such as Mn—Zn-based ferrite and Ni—Zn-based ferrite. The first magnetic core 40 is provided with a pair of first flange portions 45 and second flange portions 46 at both ends of the first winding core portion 44 in the axial direction. The second magnetic core 50 is provided with a pair of first flange portions 45 and third flange portions 56 at both ends of the second winding core portion 54 in the axial direction. The third magnetic core 60 is provided with a pair of second flange portions 46 and fourth flange portions 66 at both ends of the third winding core portion 64 in the axial direction.

The core portions 44, 54, 64 of the first to third windings have, for example, a cylindrical shape or a prismatic shape. The first winding core portion 44, the second winding core portion 54, and the third winding core portion 64 are arranged substantially coaxially. The second winding core portion 54 is arranged on one side in the axial direction of the first winding core portion 44 with the first flange portion 45 interposed therebetween. The third winding core portion 64 is arranged on the other side of the first winding core portion 44 in the axial direction with the second flange portion 46 interposed therebetween.

The first to fourth flange portions 45, 46, 56, 66 have the same shape, for example, a rectangular parallelepiped shape. The first to fourth flange portions 45, 46, 56, 66 are arranged in parallel. The first flange portion 45 and the second flange portion 46 are arranged to face each other, and the first winding core portion 44 is provided between the opposite side surfaces of the first collar portion 45 and the second flange portion 46. The first flange portion 45 and the third flange portion 56 are arranged to face each other, and a second winding core portion 54 is provided between the opposite side surfaces of the first flange portion 45 and the third flange portion 56. The second flange portion 46 and the fourth flange portion 66 are arranged to face each other, and the third winding core portion 64 is provided between the opposite side surfaces of the second flange portion 46 and the fourth collar portion 66.

The first to sixth windings 41, 42, 51, 52, 61, 62 are, for example, wound with a wire (electric wire) formed by coating a copper wire with an insulating film. In FIGS. 6 and 7, the first winding 41, the third winding 51, and the fifth winding 61 are drawn in white, and the second winding 42, the fourth winding 52, and the sixth winding 62 are drawn in white. Is painted in black. In FIGS. 6 and 7, the number of turns of the windings 41, 42, 51, 52, 61, 62 is reduced from the actual number to make it easier to see, and the windings are drawn at intervals, but the windings 41, 42 are actually drawn. , 51, 52, 61, 62 are tightly wound without any gaps.

The first winding 41 is wound from one side (for example, the first flange portion 45) of the first winding core portion 44 in the axial direction to the other side (for example, the second flange portion 46). The first winding 41 is the first coil of the common mode choke coil 20. One end 41a of the first winding 41 is drawn out onto the first external electrode 23. The other end 41b of the first winding 41 is pulled out onto the third external electrode 25.

The second winding 42 is wound from one side in the axial direction of the first winding core portion 44 to the other side. The second winding 42 is the second coil of the common mode choke coil 20. One end portion 42a of the second winding 42 is pulled out onto the second external electrode 24. The other end 42b of the second winding 42 is pulled out onto the fourth external electrode 26.

A first winding 41 wound from one side (for example, the first flange portion 45 side) to the other side (for example, the second flange portion 46 side) and a second winding wound from one side to the other side. The winding direction is the same as that of the winding 42. The first winding 41 and the second winding 42 have the same number of turns. The first winding 41 and the second winding 42 are wound in parallel with the first winding core portion 44.

The third winding 51 is wound from one side (for example, the first flange portion 45 side) of the second winding core portion 54 in the axial direction to the other side (for example, the third flange portion 56 side). One end 51a of the third winding 51 is pulled out onto the first external electrode 23. The other end 51b of the third winding 51 is pulled out onto the fifth external electrode 27.

The fourth winding 52 is wound from one side in the axial direction of the second winding core portion 54 to the other side. One end portion 52a of the fourth winding 52 is pulled out onto the second external electrode 24. The other end 52b of the fourth winding 52 is pulled out onto the fifth external electrode 27. The third winding 51 and the fourth winding 52, which are electrically connected by the fifth external electrode 27, are the primary coils of the first auto transformer 21. The fourth winding 52 is the secondary coil of the first auto transformer 21.

A third winding 51 wound from one side (for example, the first flange portion 45 side) to the other side (for example, the third flange portion 56 side) and a fourth winding wound from one side to the other side. The winding direction is opposite to that of the winding 52. It is preferable that the third winding 51 and the fourth winding 52 have the same number of turns. The third winding 51 and the fourth winding 52 are wound so as to cross (cross) the second winding core portion 54. When the third winding 51 and the fourth winding 52 are folded back at the fifth external electrode 27 of the third flange portion 56, the third winding is wound from one side to the other. The winding direction of 51 and the fourth winding 52 wound from the other side to one side are the same.

The fifth winding 61 is wound from one side (for example, the second flange portion 46 side) of the third winding core portion 64 in the axial direction to the other side (for example, the fourth flange portion 66 side). One end 61a of the fifth winding 61 is pulled out onto the third electrode 25. The other end 61b of the fifth winding 61 is pulled out onto the sixth external electrode 28.

The sixth winding 62 is wound from one side in the axial direction of the third winding core portion 64 to the other side. One end 62a of the sixth winding 62 is pulled out onto the fourth external electrode 26. The other end 62b of the sixth winding 62 is pulled out onto the sixth external electrode 28. The fifth winding 61 and the sixth winding 62, which are electrically connected by the sixth external electrode 28, are the primary coils of the second auto transformer 22. The sixth winding 62 is the secondary coil of the second auto transformer 22.

A fifth winding 61 wound from one side (for example, the second flange portion 46 side) to the other side (for example, the fourth flange portion 66 side) and a sixth winding wound from one side to the other side. The winding direction is opposite to that of the winding 62. It is preferable that the fifth winding 61 and the sixth winding 62 have the same number of turns. The fifth winding 61 and the sixth winding 62 are wound so as to cross (cross) the third winding core portion 64. When the fifth winding 61 and the sixth winding 62 are folded back at the sixth external electrode 28 of the fourth flange portion 66, the fifth winding is wound from one side to the other. The winding direction of 61 and the sixth winding 62 wound from the other side to one side are the same.

The first winding 41, the third winding 51, and the fifth winding 61 may be composed of the same wire (one wire), or different wires (three wires), respectively. It may be configured. The second winding 42, the fourth winding 52, and the sixth winding 62 may be made of the same wire, or may be made of different wires, respectively. Further, all of the first to sixth windings 41, 42, 51, 52, 61, 62 may be made of the same wire.

The first to third top plates 43, 53, 63 are magnetic plates formed of a magnetic material, and are formed of ferrite such as Mn—Zn-based ferrite and Ni—Zn-based ferrite, for example. The first to third top plates 43, 53, 63 have a rectangular plate shape. The first top plate 43 is hung between the top surface (upper end surface) of the first flange portion 45 and the top surface of the second flange portion 46, and is joined to each top surface. The second top plate 53 is hung between the top surface of the first flange portion 45 and the top surface of the third flange portion 56, and is joined to each top surface. The third top plate 63 is hung between the top surface of the second flange portion 46 and the top surface of the fourth flange portion 66, and is joined to each top surface.

The first top plate 43 and the second top plate 53 are arranged at predetermined intervals on the top surface of the first flange portion 45. Therefore, there is a gap 47 between the first top plate 43 and the second top plate 53. The first top plate 43 and the third top plate 63 are arranged at predetermined intervals on the top surface of the second flange portion 46. Therefore, there is a gap 48 between the first top plate 43 and the third top plate 63.

The first to sixth external electrodes 23, 24, 25, 26, 27, 28 are formed by, for example, metal plating or baking of a metal paste. The first to sixth external electrodes 23, 24, 25, 26, 27, 28 have, for example, a rectangular shape.

The first external electrode 23 is located at one end of the bottom surface (lower end surface) of the first flange portion 45 in the width direction (direction orthogonal to the axial direction of the first to third winding core portions 44, 54, 64). It is provided. The second external electrode 24 is provided at the other end in the width direction on the bottom surface of the first flange portion 45. The third external electrode 25 is provided at one end in the width direction on the bottom surface of the second flange portion 46. The fourth external electrode 26 is provided at the other end in the width direction on the bottom surface of the second flange portion 46. The fifth external electrode 27 is provided at the center portion in the width direction on the bottom surface of the third flange portion 56. The sixth external electrode 28 is provided at the center portion in the width direction on the bottom surface of the fourth flange portion 66.

One end 41a of the first winding 41 is electrically connected to the first external electrode 23. Further, one end portion 51a of the third winding 51 is electrically connected to the first external electrode 23. Therefore, in the first external electrode 23, one end 41a of the first winding 41 of the common mode choke coil 20 and one end 51a of the third winding 51 of the first auto transformer 21 are electrically connected.

One end portion 42a of the second winding 42 is electrically connected to the second external electrode 24. Further, one end portion 52a of the fourth winding 52 is electrically connected to the second external electrode 24. Therefore, in the second external electrode 24, one end 42a of the second winding 42 of the common mode choke coil 20 and one end 52a of the fourth winding 52 of the first auto transformer 21 are electrically connected.

The other end 41b of the first winding 41 is electrically connected to the third external electrode 25. Further, one end 61a of the fifth winding 61 is electrically connected to the third external electrode 25. Therefore, in the third external electrode 25, the other end 41b of the first winding 41 of the common mode choke coil 20 and the one end 61a of the fifth winding 61 of the second auto transformer 22 are electrically connected.

The other end 42b of the second winding 42 is electrically connected to the fourth external electrode 26. Further, one end portion 62a of the sixth winding 62 is electrically connected to the fourth external electrode 26. Therefore, in the fourth external electrode 26, the other end 42b of the second winding 42 of the common mode choke coil 20 and the one end 62a of the sixth winding 62 of the second auto transformer 22 are electrically connected.

The other end 51b of the third winding 51 is electrically connected to the fifth external electrode 27. Further, the other end 52b of the fourth winding 52 is electrically connected to the fifth external electrode 27. Therefore, in the fifth external electrode 27, the other end 51b of the third winding 51 of the first auto transformer 21 and the other end 52b of the fourth winding 52 are electrically connected. The connection point between the other end 51b of the third winding 51 and the other end 52b of the fourth winding 52 serves as an intermediate tap of the first auto transformer 21.

The other end 61b of the fifth winding 61 is electrically connected to the sixth external electrode 28. Further, the other end 62b of the sixth winding 62 is electrically connected to the sixth external electrode 28. Therefore, in the sixth external electrode 28, the other end 61b of the fifth winding 61 of the second auto transformer 22 and the other end 62b of the sixth winding 62 are electrically connected. The connection point between the other end 61b of the fifth winding 61 and the other end 62b of the sixth winding 62 serves as an intermediate tap of the second auto transformer 22.

As an example, by adopting such a structure, the winding type noise suppression component 2 can be configured. In the case of the winding type, the high frequency characteristics of the noise suppression component 2 are excellent, and the effect of suppressing common mode noise in the high frequency band can be improved.

When the three windings 41, 51, 61 and the three windings 42, 52, 62 are each composed of the same wire (one wire), the noise suppression component 2 becomes easier to manufacture and improves productivity. Can be improved. Further, since the noise countermeasure component 2 is provided with gaps 46 and 47 between the first top plate 43 and the second top plate 53 and between the first top plate 43 and the third top plate 63, the noise countermeasure component 2 and the common mode choke coil 20 The magnetic coupling between the auto transformers 21 and 22 can be suppressed. Further, in the noise suppression component 2, the third winding 51 and the fourth winding 52 have the same number of turns in the first auto transformer 21, and the fifth winding 61 and the sixth winding 62 in the second auto transformer 22. When the number of turns is the same, the impedance can be suppressed, so that the common mode noise can be easily dropped to the ground in each of the auto transformers 20 and 21, and the effect of suppressing the common mode noise can be improved.

Next, with reference to FIGS. 8 to 12, a noise countermeasure component 3 configured as a laminated type (thin film type) will be described as a second embodiment of the noise countermeasure component 1 according to the embodiment. FIG. 8 is a perspective view of the laminated noise suppression component 3 of the second embodiment. FIG. 9 is an exploded perspective view of the common mode choke coil 30 of the noise suppression component 3 shown in FIG. FIG. 10 is an exploded perspective view of the first auto transformer 31 of the noise suppression component 3 shown in FIG. FIG. 11 is an exploded perspective view of the second auto transformer 32 of the noise suppression component 3 shown in FIG. FIG. 12 is an exploded perspective view of the noise suppression component 3 shown in FIG. The right view and FIG. 12 of FIGS. 9, 10 and 11 are perspective views showing the internal coil pattern.

The noise suppression component 3 is a laminated (thin film type) component in which the common mode choke coil 30, the first auto transformer 31, and the second auto transformer 32 are integrated. The noise suppression component 3 includes six first to sixth external electrodes 33 to 38. In the noise suppression component 3, the first auto transformer 31 is arranged above the common mode choke coil 30 in the vertical direction (stacking direction), and the second auto transformer 32 is arranged below the common mode choke coil 30. , Laminated body 39 is formed. The laminated body 39 has a rectangular parallelepiped shape. In the noise suppression component 3, the first external electrode 33, the second external electrode 34 and the fifth external electrode 37 are provided on the side surface 39a of the laminated body 39, and the third external electrode 35 and the fourth are provided on the side surface 39b facing the side surface 39a. An external electrode 36 and a sixth external electrode 38 are provided.

As shown in FIG. 9, the common mode choke coil 30 includes a first non-magnetic layer (first insulating layer) 70, a pair of first coil patterns 71 and a second coil pattern 72, and a pair of first magnetic layers 73. And a second magnetic layer 74.

As shown in FIG. 10, the first auto transformer 31 includes a second non-magnetic layer (second insulating layer) 80, a pair of third coil patterns 81 and a fourth coil pattern 82, and a pair of third magnetic layers 83. And a fourth magnetic layer 84.

As shown in FIG. 11, the second auto transformer 32 includes a third non-magnetic layer (third insulating layer) 90, a pair of fifth coil patterns 91 and a sixth coil pattern 92, and a pair of fifth magnetic layers 93. And the sixth magnetic layer 94.

The first to third non-magnetic layers 70, 80, 90 are formed of a non-magnetic insulating material, for example, polyimide. The first to third non-magnetic layers 70, 80, 90 have a rectangular thin plate shape.

The first to sixth coil patterns 71, 72, 81, 82, 91, 92 are conductor patterns in which conductors are wound in a spiral shape (spiral shape). The first to sixth coil patterns 71, 72, 81, 82, 91, 92 are wound clockwise, for example, from the inner peripheral end (winding start end) to the outer peripheral end (winding end). The first to sixth coil patterns 71, 72, 81, 82, 91, 92 are arranged substantially coaxially. In FIGS. 9 to 12, the first coil pattern 71, the third coil pattern 81, and the fifth coil pattern 91 are drawn in white, and the second coil pattern 72, the fourth coil pattern 82, and the sixth coil pattern 92 are drawn in white. Is drawn with a dot pattern. In FIGS. 9 to 12, the number of turns of each coil pattern 71, 72, 81, 82, 91, 92 is reduced from the actual number for easy viewing.

The first coil pattern 71 is provided on one surface (for example, the upper surface) of the first non-magnetic layer 70. The first coil pattern 71 is the first coil of the common mode choke coil 30. A drawer pattern 71b is connected to one end (inner peripheral end) of the first coil pattern 71 via a via hole 71a. The via hole 71a is a via hole that penetrates in the thickness direction to a predetermined portion inside the first magnetic layer 73. The drawer pattern 71b is one side in the left-right direction (direction orthogonal to the stacking direction) from the via hole 71a to one end surface (side surface 39a of the laminated body 39) of the first magnetic layer 73 (where the first external electrode 33 is arranged). It is a conductor pattern drawn up to. A drawer pattern 71c is connected to the other end (outer peripheral end) of the first coil pattern 71. The drawer pattern 71c is one side (third outer) in the left-right direction at the end of one surface of the first non-magnetic layer 70 (the end opposite to the drawer side of the drawer pattern 71b, the side surface 39b of the laminated body 39). It is a conductor pattern that is drawn out to the place where the electrode 35 is arranged).

The second coil pattern 72 is provided on the other surface (for example, the lower surface) of the first non-magnetic layer 70. The second coil pattern 72 faces the first coil pattern 71 with the first non-magnetic layer 70 interposed therebetween. The second coil pattern 72 is the second coil of the common mode choke coil 30. A drawer pattern 72b is connected to one end (inner peripheral end) of the second coil pattern 72 via a via hole 72a. The via hole 72a is a via hole that penetrates in the thickness direction to a predetermined portion inside the second magnetic layer 74. The drawing pattern 72b is a conductor pattern that is drawn from the via hole 72a to the other side (where the second external electrode 34 is arranged) in the left-right direction on one end surface (side surface 39a of the laminated body 39) of the second magnetic layer 74. A drawer pattern 72c is connected to the other end (outer peripheral end) of the second coil pattern 72. The drawer pattern 72c is the other side (fourth outer side) in the left-right direction at the end of the other surface of the first non-magnetic layer 70 (the end opposite to the drawer side of the drawer pattern 72b, the side surface 39b of the laminated body 39). It is a conductor pattern that is drawn out to the place where the electrode 36 is arranged).

The first coil pattern 71 and the second coil pattern 72 have the same winding direction. The first coil pattern 71 and the second coil pattern 72 have the same number of turns.

The third coil pattern 81 is provided on one surface of the second non-magnetic layer 80. A drawer pattern 81b is connected to one end (inner peripheral end) of the third coil pattern 81 via a via hole 81a. The via hole 81a is a via hole that penetrates in the thickness direction to a predetermined portion inside the third magnetic layer 83. The drawing pattern 81b is a conductor pattern that is drawn from the via hole 81a to one side in the left-right direction (a place where the first external electrode 33 is arranged) on one end surface (side surface 39a of the laminated body 39) of the third magnetic layer 83. A drawer pattern 81c is connected to the other end (outer peripheral end) of the third coil pattern 81. The drawer pattern 81c is an intermediate portion (fifth external electrode) in the left-right direction at the end of one surface of the second non-magnetic layer 80 (the end on the same side as the drawer side of the drawer pattern 81b, the side surface 39a of the laminate 39). It is a conductor pattern that is drawn out to the place where 37 is arranged).

The fourth coil pattern 82 is provided on the other surface of the second non-magnetic layer 80. The fourth coil pattern 82 faces the third coil pattern 81 with the second non-magnetic layer 80 interposed therebetween. A drawer pattern 82b is connected to one end (inner peripheral end) of the fourth coil pattern 82 via a via hole 82a. The via hole 82a is a via hole that penetrates in the thickness direction to a predetermined portion inside the fourth magnetic layer 84. The drawing pattern 82b is a conductor pattern drawn from the via hole 82a to the intermediate portion in the left-right direction (the place where the fifth external electrode 37 is arranged) on one end surface (side surface 39a of the laminated body 39) of the fourth magnetic layer 84. A drawer pattern 82c is connected to the other end (outer peripheral end) of the fourth coil pattern 82. The drawer pattern 82c is the other side (second external electrode) in the left-right direction at the end of the other surface of the second non-magnetic layer 80 (the end on the same side as the drawer side of the drawer pattern 82b, the side surface 39a of the laminate 39). It is a conductor pattern that is drawn out to the place where 34 is arranged).

The third coil pattern 81 and the fourth coil pattern 82 have the same winding direction. It is preferable that the third coil pattern 81 and the fourth coil pattern 82 have the same number of turns. The third coil pattern 81 and the fourth coil pattern 82, which are electrically connected by the fifth external electrode 37, are the primary coils of the first auto transformer 31. The fourth coil pattern 82 is the secondary coil of the first auto transformer 31.

The fifth coil pattern 91 is provided on one surface of the third non-magnetic layer 90. A drawer pattern 91b is connected to one end (inner peripheral end) of the fifth coil pattern 91 via a via hole 91a. The via hole 91a is a via hole that penetrates in the thickness direction to a predetermined portion inside the fifth magnetic layer 93. The drawing pattern 91b is a conductor pattern that is drawn from the via hole 91a to one side in the left-right direction (where the third external electrode 35 is arranged) on the other end surface (side surface 39b of the laminated body 39) of the fifth magnetic layer 93. A drawer pattern 91c is connected to the other end (outer peripheral end) of the fifth coil pattern 91. The drawer pattern 91c is an intermediate portion (sixth external electrode) in the left-right direction at the end of one surface of the third non-magnetic layer 90 (the end on the same side as the drawer side of the drawer pattern 91b, the side surface 39b of the laminated body 39). It is a conductor pattern that is drawn out to the place where 38 is arranged).

The sixth coil pattern 92 is provided on the other surface of the third non-magnetic layer 90. The sixth coil pattern 92 faces the fifth coil pattern 91 with the third non-magnetic layer 90 interposed therebetween. A drawer pattern 92b is connected to one end (inner peripheral end) of the sixth coil pattern 92 via a via hole 92a. The via hole 92a is a via hole that penetrates in the thickness direction to a predetermined portion inside the sixth magnetic layer 94. The drawing pattern 92b is a conductor pattern that is drawn from the via hole 92a to the middle portion in the left-right direction (the place where the sixth external electrode 38 is arranged) on the other end surface (side surface 39b of the laminated body 39) of the sixth magnetic layer 94. A drawer pattern 92c is connected to the other end (outer peripheral end) of the sixth coil pattern 92. The drawer pattern 92c is the other side (fourth external electrode) in the left-right direction at the end of the other surface of the third non-magnetic layer 90 (the end on the same side as the drawer side of the drawer pattern 92b, the side surface 39b of the laminated body 39). It is a conductor pattern that is drawn out to the place where 36 is arranged).

The fifth coil pattern 91 and the sixth coil pattern 92 have the same winding direction. It is preferable that the fifth coil pattern 91 and the sixth coil pattern 92 have the same number of turns. The fifth coil pattern 91 and the sixth coil pattern 92, which are electrically connected by the sixth external electrode 38, are the primary coils of the second auto transformer 32. The sixth coil pattern 92 is the secondary coil of the second auto transformer 32.

The first to sixth magnetic layers 73, 74, 83, 84, 93, 94 are magnetic substrates formed of a magnetic material, and are formed of, for example, ferrite. The first to sixth magnetic layers 73, 74, 83, 84, 93, 94 have a rectangular thin plate shape.

The pair of the first magnetic layer 73 and the second magnetic layer 74 face each other with the pair of the first coil pattern 71 and the second coil pattern 72 interposed therebetween. The first magnetic layer 73 is arranged above the first coil pattern 71 in the stacking direction. The second magnetic layer 74 is arranged below the second coil pattern 72 in the stacking direction.

The pair of the third magnetic layer 83 and the fourth magnetic layer 84 face each other with the pair of the third coil pattern 81 and the fourth coil pattern 82 interposed therebetween. The third magnetic layer 83 is arranged above the third coil pattern 81 in the stacking direction. The fourth magnetic layer 84 is arranged below the fourth coil pattern 82 in the stacking direction. The fourth magnetic layer 84 of the first auto transformer 31 is arranged above the first magnetic layer 73 of the common mode choke coil 30 in the stacking direction.

The pair of the fifth magnetic layer 93 and the sixth magnetic layer 94 face each other with the pair of the fifth coil pattern 91 and the sixth coil pattern 92 interposed therebetween. The fifth magnetic layer 93 is arranged above the fifth coil pattern 91 in the stacking direction. The fifth magnetic layer 93 of the second auto transformer 32 is arranged below the second magnetic layer 74 of the common mode choke coil 30 in the stacking direction. The sixth magnetic layer 94 is arranged below the sixth coil pattern 92 in the stacking direction.

With this configuration, the laminated body 39 has the sixth magnetic layer 94, the sixth coil pattern 92, the third non-magnetic layer 90, the fifth coil pattern 91, the fifth magnetic layer 93, and the fifth magnetic layer 93 in this order from the bottom. 2 magnetic layer 74, 2nd coil pattern 72, 1st non-magnetic layer 70, 1st coil pattern 71, 1st magnetic layer 73, 4th magnetic layer 84, 4th coil pattern 82, 2nd non-magnetic layer 80, 1st The three coil patterns 81 and the third magnetic layer 83 are laminated.

The first external electrode 33 is provided on one side of the side surface 39a of the laminated body 39 in the left-right direction. The second external electrode 34 is provided on the other side of the side surface 39a of the laminated body 39 in the left-right direction. The third external electrode 35 is provided on one side of the side surface 39b of the laminated body 39 in the left-right direction and faces the first external electrode 33. The fourth external electrode 36 is provided on the other side of the side surface 39b of the laminated body 39 in the left-right direction and faces the second external electrode 34. The fifth external electrode 37 is provided at the central portion (between the first external electrode 33 and the second external electrode 34) of the side surface 39a of the laminated body 39. The sixth external electrode 38 is provided at the central portion (between the third external electrode 35 and the fourth external electrode 36) of the side surface 39b of the laminated body 39, and faces the fifth external electrode 37.

The first to sixth external electrodes 33 to 38 are provided from the upper end to the lower end of the side surfaces 39a and 39b of the laminated body 39. Further, the first to sixth external electrodes 33 to 38 are provided from the upper ends of the side surfaces 39a and 39b of the laminate 39 to a part of the upper surface 39c of the laminate 39 and from the lower ends of the side surfaces 39a and 39b of the laminate 39. A part of the lower surface 39d of the laminated body 39 is provided. Therefore, the cross-sectional shapes of the first to sixth external electrodes 33 to 38 are substantially U-shaped.

A drawer pattern 71b connected to one end of the first coil pattern 71 via a via hole 71a is electrically connected to the first external electrode 33. Further, a drawer pattern 81b connected to one end of the third coil pattern 81 via a via hole 81a is electrically connected to the first external electrode 33. Therefore, in the first external electrode 33, one end of the first coil pattern 71 of the common mode choke coil 30 and one end of the third coil pattern 81 of the first auto transformer 31 are electrically connected.

A drawer pattern 72b connected to one end of the second coil pattern 72 via a via hole 72a is electrically connected to the second external electrode 34. Further, a drawer pattern 82c connected to the other end of the fourth coil pattern 82 is electrically connected to the second external electrode 34. Therefore, in the second external electrode 34, one end of the second coil pattern 72 of the common mode choke coil 30 and the other end of the fourth coil pattern 82 of the first auto transformer 31 are electrically connected.

A drawer pattern 71c connected to the other end of the first coil pattern 71 is electrically connected to the third external electrode 35. Further, a drawer pattern 91b connected to one end of the fifth coil pattern 91 via a via hole 91a is electrically connected to the third external electrode 35. Therefore, in the third external electrode 35, the other end of the first coil pattern 71 of the common mode choke coil 30 and one end of the fifth coil pattern 91 of the second auto transformer 32 are electrically connected.

A drawer pattern 72c connected to the other end of the second coil pattern 72 is electrically connected to the fourth external electrode 36. Further, a drawer pattern 92c connected to the other end of the sixth coil pattern 92 is electrically connected to the fourth external electrode 36. Therefore, in the fourth external electrode 36, the other end of the second coil pattern 72 of the common mode choke coil 30 and the other end of the sixth coil pattern 92 of the second auto transformer 32 are electrically connected.

A drawer pattern 81c connected to the other end of the third coil pattern 81 is electrically connected to the fifth external electrode 37. Further, a drawer pattern 82b connected to one end of the fourth coil pattern 82 via a via hole 82a is electrically connected to the fifth external electrode 37. Therefore, at the fifth external electrode 37, the other end of the third coil pattern 81 of the first auto transformer 31 and one end of the fourth coil pattern 82 are electrically connected. The connection point between the other end of the third coil pattern 81 and one end of the fourth coil pattern 82 serves as an intermediate tap of the first auto transformer 31.

A drawer pattern 91c connected to the other end of the fifth coil pattern 91 is electrically connected to the sixth external electrode 38. Further, a drawer pattern 92b connected to one end of the sixth coil pattern 92 via a via hole 92a is electrically connected to the sixth external electrode 38. Therefore, in the sixth external electrode 38, the other end of the fifth coil pattern 91 of the second auto transformer 32 and one end of the sixth coil pattern 92 are electrically connected. The connection point between the other end of the fifth coil pattern 91 and one end of the sixth coil pattern 92 serves as an intermediate tap of the second auto transformer 32.

As an example, with such a structure, a laminated type (thin film type) noise countermeasure component 3 can be configured. In the case of the laminated type, the noise suppression component 3 can be miniaturized. In particular, since the auto transformers 31 and 32 are stacked on the top and bottom of the common mode choke coil 30, the noise suppression component 3 can be further miniaturized.

The noise countermeasure component 3 is for the first magnetic layer 73 and the second magnetic layer 74 for the common mode choke coil 30 and the auto transformers 31 and 32 at the portions where the common mode choke coil 30 and the auto transformers 31 and 32 are in contact with each other. Since the fourth magnetic layer 84 and the fifth magnetic layer 93 are provided separately, magnetic coupling between the common mode choke coil 30 and the auto transformers 31 and 32 can be suppressed. Further, in the noise suppression component 3, the third coil pattern 81 and the fourth coil pattern 82 have the same number of turns in the first auto transformer 31, and the fifth coil pattern 91 and the sixth coil pattern 92 in the second auto transformer 32. When the number of turns is the same, the impedance can be suppressed, so that the common mode noise can be easily dropped to the ground in each of the auto transformers 30 and 31, and the effect of suppressing the common mode noise can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified in various ways. For example, in the above embodiment, it is applied to the noise suppression component 1 configured as a composite component in which one common mode choke coil 10 and two auto transformers 11 and 12 are integrated, but it may be applied to a noise suppression module. .. This noise suppression module includes, for example, three components of one common mode choke coil and two auto transformers, and these three components are mounted on a board and shown in the equivalent circuit of FIG. It is a module built in the package in the state of being connected to. Further, it may be applied to a noise suppression module including two capacitors. In this noise suppression module, for example, two capacitors are also mounted on the same board, and one end (one electrode) of each capacitor and an intermediate tap of each auto transformer are connected as shown in the circuit diagram shown in FIG. It is a module built into the package in the state.

In the first embodiment, the first to third top plates 43, 53, 63 are made of separate members to form noise suppression components 2 having gaps 47 and 48, but the first to third top plates are integrated. It may be a noise countermeasure component provided with one magnetic plate.

In the second embodiment, the noise suppression component 3 in which the first auto transformer 31 and the second auto transformer 32 are stacked above and below the common mode choke coil 30 is used as the noise suppression component 3, but the noise suppression component of another form of the laminated type (thin film type) is used. For example, the first auto transformer 31 and the second auto transformer 32 may be arranged on the left and right sides of the common mode choke coil 30 as noise suppression components.

In the second embodiment, the first magnetic layer 73 for the common mode choke coil 30 and the second magnetic layer 74 and the auto transformers 31 and 32 are used at the portions where the common mode choke coil 30 and the auto transformers 31 and 32 are in contact with each other. Although the noise countermeasure component 3 is provided with the fourth magnetic layer 84 and the fifth magnetic layer 93 separately, the common mode choke coil 30 and each auto are in contact with the common mode choke coil 30 and the auto transformers 31 and 32. It may be a noise countermeasure component provided with a common magnetic layer in the transformers 31 and 32. In this case, the first magnetic layer 73 and the fourth magnetic layer 84 serve as a common magnetic layer, and the second magnetic layer 74 and the fifth magnetic layer 93 serve as a common magnetic layer.

1,2,3 Noise countermeasure parts 4 Differential transmission line 7 1st capacitor 8 2nd capacitor 10, 20, 30 Common mode choke coil 10a 1st coil 10b 2nd coil 10c, 10d One end 10e, 10f The other end 11 , 21, 31 1st auto transformer 11a coil 11b intermediate tap 11c one end 11d other end 12, 22, 32 2nd auto transformer 12a coil 12b intermediate tap 12c one end 12d other end 13, 23, 33 1st external electrode 14,24,34 2nd external electrode 15,25,35 3rd external electrode 16,26,36 4th external electrode 17,27,37 5th external electrode 18,28,38 6th external electrode 40,50,60 1st to 3rd magnetic cores 41, 42, 51, 52, 61, 62 1st to 6th windings 43, 53, 63 1st to 3rd top plates 44, 54, 64 1st to 3rd winding cores 45,46,56,66 1st to 4th flanges 47,48 Gap 70,80,90 1st to 3rd non-magnetic layers 71,72,81,82,91,92 1st to 6th coil patterns 73 , 74, 83, 84, 93, 94 1st to 6th magnetic layers

Claims (5)

A common mode choke coil having a first coil and a second coil,
A first auto transformer having a coil and an intermediate tap provided in the middle of the coil,
A second auto transformer that has a coil and has an intermediate tap in the middle of the coil.
A first external electrode to which one end of the first coil of the common mode choke coil is electrically connected and one end of the coil of the first auto transformer is electrically connected.
A second external electrode to which one end of the second coil of the common mode choke coil is electrically connected and the other end of the coil of the first auto transformer is electrically connected.
A third external electrode to which the other end of the first coil of the common mode choke coil is electrically connected and one end of the coil of the second auto transformer is electrically connected.
A fourth external electrode to which the other end of the second coil of the common mode choke coil is electrically connected and the other end of the coil of the second auto transformer is electrically connected.
With the fifth external electrode to which the intermediate tap of the first auto transformer is electrically connected,
With the sixth external electrode to which the intermediate tap of the second auto transformer is electrically connected,
With
The common mode choke coil is formed on a first magnetic core composed of a first winding core portion and a first flange portion and a second flange portion provided at both ends of the first winding core portion, and the first winding core portion. The first winding to be wound, the second winding wound around the first winding core in the same winding direction as the first winding, the top surface of the first flange portion, and the second winding. It is composed of a first top plate erected between the top surfaces of the collar.
The first auto transformer includes a second magnetic core composed of a second winding core portion and the first flange portion and the third flange portion provided at both ends of the second winding core portion, and the second winding core portion. A third winding wound around the second winding core portion, a fourth winding wound around the second winding core portion in a winding direction opposite to that of the third winding, the top surface of the first flange portion, and the above. It is composed of a second top plate erected between the top surfaces of the third brim.
The second auto transformer includes a third magnetic core composed of a third winding core portion and the second flange portion and the fourth flange portion provided at both ends of the third winding core portion, and the third winding core portion. A fifth winding wound around the third winding core portion, a sixth winding wound around the third winding core portion in a winding direction opposite to that of the fifth winding, the top surface of the second flange portion, and the above. It is composed of a third top plate erected between the top surfaces of the fourth brim.
The first external electrode is provided on the bottom surface of the first flange portion, and one end of the first winding is electrically connected and one end of the third winding is electrically connected.
The second external electrode is provided on the bottom surface of the first flange portion, and one end of the second winding is electrically connected and one end of the fourth winding is electrically connected.
The third external electrode is provided on the bottom surface of the second flange portion, the other end of the first winding is electrically connected, and one end of the fifth winding is electrically connected.
The fourth external electrode is provided on the bottom surface of the second flange portion, the other end of the second winding is electrically connected, and one end of the sixth winding is electrically connected.
The fifth external electrode is provided on the bottom surface of the third flange portion, the other end of the third winding is electrically connected, and the other end of the fourth winding is electrically connected. ,
The sixth external electrode is provided on the bottom surface of the fourth flange portion, and the other end of the fifth winding is electrically connected and the other end of the sixth winding is electrically connected. noise-reducing components shall be the feature of the Rukoto. The first top plate and the second top plate are arranged at a predetermined interval on the top surface of the first flange portion.
The noise countermeasure component according to claim 1 , wherein the first top plate and the third top plate are arranged at a predetermined interval on the top surface of the second flange portion. The first winding, the third winding, and the fifth winding are made of the same wire.
Wherein the second winding said the fourth winding and the sixth winding, noise suppression component according to claim 1 or claim 2, characterized in that it is constituted by the same wire. A common mode choke coil having a first coil and a second coil,
A first auto transformer having a coil and an intermediate tap provided in the middle of the coil,
A second auto transformer that has a coil and has an intermediate tap in the middle of the coil.
A first external electrode to which one end of the first coil of the common mode choke coil is electrically connected and one end of the coil of the first auto transformer is electrically connected.
A second external electrode to which one end of the second coil of the common mode choke coil is electrically connected and the other end of the coil of the first auto transformer is electrically connected.
A third external electrode to which the other end of the first coil of the common mode choke coil is electrically connected and one end of the coil of the second auto transformer is electrically connected.
A fourth external electrode to which the other end of the second coil of the common mode choke coil is electrically connected and the other end of the coil of the second auto transformer is electrically connected.
With the fifth external electrode to which the intermediate tap of the first auto transformer is electrically connected,
With the sixth external electrode to which the intermediate tap of the second auto transformer is electrically connected,
With
The common mode choke coil, across a first nonmagnetic layer, the first coil pattern and the second coil pattern that will be stacked across the first nonmagnetic layer, the person first coil pattern and the second coil pattern in is constituted by a first magnetic layer and the second magnetic layer Ru are stacked,
The first autotransformer, sandwiching the second nonmagnetic layer, and a third coil pattern and the fourth coil patterns that will be stacked across the second nonmagnetic layer, an equivalent third coil pattern and the fourth coil pattern in is constituted by the third magnetic layer and the fourth magnetic layer Ru are stacked,
Said second autotransformer, sandwiching a third non-magnetic layer, and said third fifth coil pattern and a sixth coil patterns that will be laminated to sandwich the non-magnetic layer, a skilled fifth coil pattern and the sixth coil pattern in it is constituted by a fifth magnetic layer and the sixth magnetic layer Ru are stacked,
In the first external electrode, one end of the first coil pattern is electrically connected and one end of the third coil pattern is electrically connected.
In the second external electrode, one end of the second coil pattern is electrically connected and the other end of the fourth coil pattern is electrically connected.
In the third external electrode, the other end of the first coil pattern is electrically connected and one end of the fifth coil pattern is electrically connected.
In the fourth external electrode, the other end of the second coil pattern is electrically connected and the other end of the sixth coil pattern is electrically connected.
In the fifth external electrode, the other end of the third coil pattern is electrically connected and one end of the fourth coil pattern is electrically connected.
The sixth external electrodes, noise suppression components other end of the fifth coil pattern you characterized in that one end of the sixth coil pattern is electrically connected are electrically connected. The laminated body is formed by stacking the first auto transformer on the upper side of the common mode choke coil in the stacking direction and stacking the second auto transformer on the lower side of the coil mode choke coil in the stacking direction. Being done
The first external electrode, the second external electrode, and the fifth external electrode are provided on one side surface of the laminate.
The noise suppression component according to claim 4 , wherein the third external electrode, the fourth external electrode, and the sixth external electrode are provided on the other side surface of the laminated body facing the one side surface.

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