KR101059988B1 - Stacked common mode filter with impedance matching - Google Patents

Abstract

The present invention relates to a stacked common mode filter capable of impedance matching, and more particularly, to the design of matching of coil lines with respect to the difference in length of conductors and central magnetic flux generated in coils in a common mode filter. Perfectly implements matching between coils that has not been overcome in the prior art, effectively controlling the residual impedance components remaining in normal mode, eliminating the difference in impedance between coils, and miniaturizing magnetic flux. The present invention relates to a stacked type common mode filter capable of impedance matching capable of shifting the SRF (magnetic resonance frequency) of impedance up to a high frequency by forming a?

According to the present invention, it is possible to match the coil lines with respect to the center magnetic flux and the length difference of the conductors generated between the coils in the common mode filter, thereby perfecting the matching between coils that has not been overcome in the prior art. In this way, it is possible to effectively control the residual impedance components remaining in the normal mode and to eliminate the impedance difference between coils.

 Common mode filter, ferrite, heterogeneous composite material, nonmagnetic material, magnetic material.

Description

Common Mode Filter possible Impedance matching.

The present invention relates to a stacked common mode filter capable of impedance matching, and more particularly, to the design of matching of coil lines with respect to the difference in length of conductors and central magnetic flux generated in coils in a common mode filter. Perfectly implements matching between coils that has not been overcome in the prior art, effectively controlling the residual impedance components remaining in normal mode, eliminating the difference in impedance between coils, and miniaturizing magnetic flux. The present invention relates to a stacked type common mode filter capable of impedance matching capable of shifting the SRF (magnetic resonance frequency) of impedance up to a high frequency by forming a?

In coil parts such as common mode choke coils or transformers, it is important to increase the electromagnetic coupling between the primary coil and the secondary coil in order to improve the electrical characteristics of the coil component. In order to increase the degree, the distance between the two coils should be reduced or a magnetic path should be formed to prevent leakage magnetic flux.

However, the terminal for mounting is biased at each corner side in the SMD type, and therefore, the terminal cannot be formed to form a matching relationship between coils.

As shown in FIG. 1, when the terminal is formed at the edge side, a difference in coil rotation of at least 0.5 turns between coil formations in the central gyro structure is inevitably generated.

In other words, the difference in the terminal distance occurs, so the difference in impedance value, the length of the lead wire, and the difference in the number of turns (revolutions) of the magnetic core (center magnetic path) must occur. It cannot be formed.

Therefore, each manufacturer uses various methods to compensate for the coil rotation speed between coils, but does not form a perfect matching relationship.

In other words, in the spiral coil shown in FIG. 2, the spiral coil is similarly compensated for the difference in impedance between terminals by forming the coil starting position to one side as shown in the photo of FIG. There will be at least 8% impedance difference.

In addition, as a compensation method of Innochips Korea shown in FIG. 3, the central magnetic path (self core) is also biased from the center, and the coil is also designed to be biased to one side, so that the side leading to the coil from the terminal part is designed far from the magnetic core (magnetic core). In this case, at least 5% of the impedance difference between coils is generated.

In addition, the compensation of the Taiwan Infect shown in Figure 4 to the center magnetic path (magnetic core) to one side, and compensated by adjusting the distance between the coil and the central magnetic path (magnetic core).

In addition, although the method of compensating the number of rotations of one coil in the coil configuration is used as the compensation method of Ceratech of Korea shown in FIG. 5, this also causes a difference in impedance between coils of at least 4%.

As described above, in the conventional central magnetic path (magnetic core) structure, perfect matching between two coils cannot be achieved, and thus a matching method is selected for each manufacturer.

Such coil mismatch structure is considered to be inevitable in the stacked type, and there is no progress on the coil formation method anymore, so the mismatch of impedance could not be solved.

Specifically, the reason for this will be described with reference to FIGS. 6 to 7. When two coils are configured in a central magnetic path (magnetic core) structure, the difference between the rotational speed of the coil and the length of the conductive wire is inevitably generated.

The two coils rotating the central magnetic core of FIG. 7 in the same direction are present in the central nonmagnetic material. However, a path difference may be generated in order to connect to the position of the terminal.

In the case of the coil indicated in blue in FIG. 7, the number of turns of the coil is 3.75 turns due to the terminal position, but in the case of the coil marked in red, 3.25 turns are formed.

Therefore, in the central magnetic core structure, a difference in the rotational speed of at least 0.5 turns occurs, and in the case of the coil shown in blue, the length of the conductor was inevitably longer than that shown in red in order to connect with the terminal part.

Therefore, the present invention has been proposed in view of the problems of the prior art as described above, and an object of the present invention is to have two magnetic cores in the center to form a coil around the magnetic core, so that the two coils are accurately matched to each other. The purpose is to form the same length and turn.

Another object of the present invention is to have two magnetic cores to form more rotational speeds in the same laminated layer than the central magnetic core structure in the stack design.

Another object of the present invention is that the SRF of the impedance is moved to the high frequency because the internal diameter of the magnetic core is made smaller than the central magnetic core structure to form a small magnetic core diameter so that the characteristics of the high frequency characteristics can be improved to provide It is.

In order to achieve the problem to be solved by the present invention,

According to an embodiment of the present invention, a multilayer common mode filter capable of impedance matching may include:

In the stacked common mode filter,

An upper ferrite cover layer 100 formed of a magnetic material on the upper side;

The non-magnetic material is formed on the lower side of the upper ferrite cover layer, and the central non-magnetic material layer 200 in which two holes 250 are formed so that the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are formed in a central portion thereof. )and;

A first ferrite magnetic core 300a and a second ferrite magnetic core 300b respectively formed in two holes of the central nonmagnetic layer;

A lower ferrite cover layer 400 formed of a magnetic material under the central nonmagnetic material layer;

And a first coil 500a and a second coil 500b which are formed in the central nonmagnetic layer and are formed to rotate on the first ferrite magnetic core 300a and the second ferrite magnetic core 300b. The problem of this invention is solved.

According to the present invention, the stacked common mode filter capable of impedance matching according to the present invention having the above-described configuration and functions can match coil lines with respect to the center magnetic flux and the length difference of the conductors generated between coils in the common mode filter. Perfectly implements matching between coils, which has not been overcome in the prior art, and effectively controls the residual impedance components remaining in the normal mode, as well as eliminating the difference in impedance between coils. Done.

In addition, it is configured to have two magnetic cores to provide an effect of forming more rotational speed in the same laminated layer than the central magnetic core structure in the stack design.

In addition, since the SRF of the impedance is moved toward the high frequency because the internal diameter of the magnetic core is smaller than the central magnetic core structure, the magnetic core inner diameter is formed to be small, thereby providing the effect of improving the high frequency characteristics.

In order to achieve the above object, a stacked common mode filter capable of impedance matching according to an embodiment of the present invention,

In the stacked common mode filter,

An upper ferrite cover layer 100 formed of a magnetic material on the upper side;

The central non-magnetic layer 200 is formed of a nonmagnetic material on the lower side of the upper ferrite cover layer, and the two holes 250 are formed so that the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are formed in the central portion. )and;

A first ferrite magnetic core 300a and a second ferrite magnetic core 300b respectively formed in two holes of the central nonmagnetic layer;

A lower ferrite cover layer 400 formed of a magnetic material under the central nonmagnetic material layer;

And a first coil 500a and a second coil 500b which are formed in the central nonmagnetic layer and are formed to rotate on the first ferrite magnetic core 300a and the second ferrite magnetic core 300b. It features.

At this time, the first coil 500a and the second coil 500b,

When the second ferrite magnetic core 300b is formed in the counterclockwise or clockwise direction, the first ferrite magnetic core 300a is formed in the clockwise or counterclockwise direction.

At this time, the first coil 500a and the second coil 500b,

The number of rotations and the lengths formed in the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are symmetrically formed.

In this case, the central nonmagnetic layer 200,

Via holes 600 formed around the first ferrite magnetic core 300a and the second ferrite magnetic core 300b, respectively,

A print pattern 700 for connecting each via hole is formed.

In this case, when the first coil 500a and the second coil 500b are stacked on the central non-magnetic layer 200,

The first coil formed in one layer and the second coil formed in the other layer are characterized by a 180 degree rotational symmetry structure.

On the other hand, the stacked common mode filter capable of impedance matching according to another embodiment of the present invention,

An upper ferrite cover layer formed of a magnetic material on the upper side;

A central nonmagnetic layer formed of a nonmagnetic material on the lower side of the upper ferrite cover layer and having a ferrite magnetic core formed at a central portion thereof;

A ferrite core formed on the central nonmagnetic layer;

A lower ferrite cover layer formed of a magnetic material under the central nonmagnetic material layer;

In the central non-magnetic layer, a coil formed by rotating the ferrite magnetic core; laminated type common mode filter comprising a,

Two holes 250 are formed to form a first ferrite magnetic core 300a and a second ferrite magnetic core 300b at a central portion of the central nonmagnetic layer.

The first ferrite magnetic core 300a and the second ferrite magnetic core 300b are respectively formed in the formed two holes,

The first coil 500a and the second coil 500b are formed in the central nonmagnetic layer, and the first coil 500a and the second coil 500b are rotated to form the first ferrite magnetic core 300a and the second ferrite magnetic core 300b.

At this time, the first coil 500a and the second coil 500b,

When the second ferrite magnetic core 300b is formed in the counterclockwise or clockwise direction, the first ferrite magnetic core 300a is formed in the clockwise or counterclockwise direction.

At this time, the first coil 500a and the second coil 500b,

The number of rotations and the lengths formed in the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are symmetrically formed.

At this time, the central nonmagnetic layer,

Via holes 600 formed around the first ferrite magnetic core 300a and the second ferrite magnetic core 300b, respectively,

A print pattern 700 for connecting each via hole is formed.

At this time, when the first coil 500a and the second coil 500b are stacked on the central non-magnetic layer,

The first coil formed in one layer and the second coil formed in the other layer are characterized by a 180 degree rotational symmetry structure.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the multilayer common mode filter capable of impedance matching according to the present invention.

8 is a perspective view of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

9 is an exemplary diagram showing a magnetic flux path in the case of two magnetic cores of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

FIG. 10 is a schematic diagram illustrating a multilayer common mode filter capable of impedance matching according to an embodiment of the present invention. Referring to FIG.

FIG. 11 is a schematic diagram illustrating a double stack of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

12 is a graph showing the characteristics between a stacked common mode filter capable of impedance matching and a conventional stacked common mode filter according to an embodiment of the present invention.

FIG. 13 is a graph illustrating high frequency characteristics between a stacked common mode filter capable of impedance matching and a conventional stacked common mode filter according to an embodiment of the present invention.

In more detail, as shown in FIG. 8, in order to achieve the above object, the present invention provides a multilayer type common mode filter capable of impedance matching.

In the stacked common mode filter,

An upper ferrite cover layer 100 formed of a magnetic material on the upper side;

The central non-magnetic layer 200 is formed of a nonmagnetic material on the lower side of the upper ferrite cover layer, and the two holes 250 are formed so that the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are formed in the central portion. )and;

A first ferrite magnetic core 300a and a second ferrite magnetic core 300b respectively formed in two holes of the central nonmagnetic layer;

A lower ferrite cover layer 400 formed of a magnetic material under the central nonmagnetic material layer;

And a first coil 500a and a second coil 500b which are formed in the central nonmagnetic layer and are formed to rotate on the first ferrite magnetic core 300a and the second ferrite magnetic core 300b.

As described above, a stacked common mode filter is formed and an external electrode is formed.

The most essential part of the present invention is to construct two magnetic cores instead of one central magnetic core in the central nonmagnetic layer as described above.

That is, as mentioned in the related art, when two coils are configured in the central magnetic core structure (one magnetic core), the difference between the rotational speed of the coil and the length of the conductor may occur.

In other words, the two coils rotating in the same direction of the central magnetic core exist in the nonmagnetic material. However, a path difference is inevitably generated in order to connect to the position of the terminal.

As shown in FIG. 7, in the case of the coil marked in blue, the rotational speed of the coil is 3.75 turns due to the terminal position, but in the case of red, the 3.25 turns are formed.

Therefore, in the central magnetic core structure, the rotation speed difference of at least 0.5 turn occurs. In case of the coil shown in blue, the length of the conductor was inevitably longer than the case shown in red to connect with the terminal part.

In order to improve the above problems, the structure is constructed in two magnetic methods.

To this end, the central nonmagnetic layer 200 is formed of a nonmagnetic material, and two holes 250 are formed to form a first ferrite magnetic core 300a and a second ferrite magnetic core 300b in a central portion thereof.

At this time, the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are formed in two holes of the central non-magnetic layer.

In addition, the first coil 500a and the second coil 500b are formed in the central nonmagnetic layer, and the first coil 500a and the second coil 500b are rotated on the first ferrite magnetic core 300a and the second ferrite magnetic core 300b.

As shown in FIG. 9, when the first ferrite magnetic core 300a and the second ferrite magnetic core 300b are formed, a coil existing in the nonmagnetic material rotates around two magnetic cores.

That is, when the first coil 500a and the second coil 500b are formed counterclockwise or clockwise at the second ferrite magnetic core 300b, the first coil 500a and the second coil 500b are formed clockwise or counterclockwise at the first ferrite magnetic core 300a. do.

In other words, when the coil rotates clockwise at one magnetic core, the other magnetic core rotates counterclockwise.

For example, when the second ferrite magnetic core is viewed as the beginning of the coil, the coil is formed counterclockwise from the second ferrite magnetic core, and the coil is rotated clockwise in the first ferrite magnetic core so that magnetic flux can be formed as a whole. It has a coil structure.

In addition, the two coils have 3.5 turns and 3.25 turns respectively formed in the first ferrite magnetic core and the second ferrite magnetic core as shown separately on the right side, so that the total number of turns of the coil is 6.75 turns, and the blue and red coils The rotation speed and the length are formed to be symmetrical.

In addition, in the case of forming a structure having two magnetic cores, it is possible to form more rotations in the same laminated layer than the central magnetic core structure in the stack design.

As shown in FIG. 10, when two coils are actually stacked, the coils formed in spiral around the magnetic core are connected by the printed pattern 700 of another electrode layer of blue connected to the red via hole 600. It is designed to be.

The coil designs of A and B are 180 ° rotationally symmetrical, so that the coils match perfectly.

To this end, the central nonmagnetic layer 200,

Via holes 600 formed around the first ferrite magnetic core 300a and the second ferrite magnetic core 300b, respectively,

The print pattern 700 connecting the via holes is formed.

On the other hand, Figure 11 is a schematic diagram of the coil design in the case of a stacked common mode filter double, when the coil start portion is shorter when viewed from the # 3 coil and # 4 coil in the upper layer CMF, the coil end portion is supplemented by that long, so that the coil matching relationship Will remain the same.

FIG. 12 illustrates the characteristics of a common mode filter formed by a matching relationship between an impedance-matched stacked common mode filter and a conventional stacked common mode filter. The impedance difference in the design of two magnetic core structures is shown.

It shows that the impedance and common mode impedance of A and B coils have the same characteristics.

However, it can be seen that in the conventional central magnetic core structure (one magnetic core), a difference in impedance between coils occurs.

In addition, as shown in FIG. 13, the SRF of Impedance has a high frequency because the inner diameter of the magnetic core is small when the two magnetic core structures are designed in comparison with the central magnetic core structure (one magnetic core) in the case of proceeding with a perfect matching design. Since it moves toward, the effect of improving the high frequency characteristics was obtained.

In conclusion, through the above configuration, it is possible to match the coil lines with respect to the central magnetic flux and the difference in the length of the conductors generated between the coils in the common mode filter, so that the matching between coils, which has not been overcome in the prior art ( By implementing matching perfectly, it effectively controls the residual impedance component remaining in the normal mode and provides the effect of eliminating the impedance difference between coils.

Those skilled in the art to which the present invention pertains as described above may understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The laminated common mode filter of the present invention capable of impedance matching,

In the common mode filter, it is possible to match the coil lines with respect to the center magnetic flux and the difference in the length of the conductors generated between the coils, thereby fully realizing the matching between coils, which was not overcome by the prior art. In addition to effectively controlling the residual impedance component remaining in the normal mode, it provides an effect of eliminating the impedance difference between coils, and thus will be widely used in the common mode filter field.

1 is an exemplary view showing a difference in coil rotation speed between coil formation according to a conventional central magnetic structure.

Figure 2 is an exemplary view showing an example of a coil design for compensating the conventional rotational speed between coils.

3 is an exemplary view showing another example of a coil design for compensating the conventional rotational speed between coils.

Figure 4 is an exemplary view showing another example of a coil design for compensating the conventional rotational speed between coils.

Figure 5 is an exemplary view showing another example of a coil design for compensating the conventional rotational speed between coils.

6 is an exemplary view showing a common mode filter of a conventional central magnetic core method.

7 is an exemplary view illustrating a magnetic flux path of a common mode filter of a conventional central magnetic core method.

8 is a perspective view of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

9 is an exemplary diagram showing a magnetic flux path in the case of two magnetic cores of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

FIG. 10 is a schematic diagram illustrating a multilayer common mode filter capable of impedance matching according to an embodiment of the present invention. Referring to FIG.

FIG. 11 is a schematic diagram illustrating a double stack of a stacked common mode filter capable of impedance matching according to an embodiment of the present invention.

12 is a graph showing the characteristics between a stacked common mode filter capable of impedance matching and a conventional stacked common mode filter according to an embodiment of the present invention.

FIG. 13 is a graph illustrating high frequency characteristics between a stacked common mode filter capable of impedance matching and a conventional stacked common mode filter according to an embodiment of the present invention.

Description of the Related Art [0002]

100: upper ferrite cover layer

200: central nonmagnetic layer

250: hole

300a: first ferrite core

300b: second ferrite core

400: lower ferrite cover layer

500: external electrode

600: via hole

700: print pattern

Claims (10)

delete delete delete delete delete An upper ferrite cover layer formed of a magnetic material on the upper side; A central nonmagnetic layer formed of a nonmagnetic material on the lower side of the upper ferrite cover layer and having a ferrite magnetic core formed at a central portion thereof; A ferrite core formed on the central nonmagnetic layer; A lower ferrite cover layer formed of a magnetic material under the central nonmagnetic material layer; In the central non-magnetic layer, a coil formed by rotating the ferrite magnetic core; laminated type common mode filter comprising a, Two holes 250 are formed to form a first ferrite magnetic core 300a and a second ferrite magnetic core 300b at a central portion of the central nonmagnetic layer. The first ferrite magnetic core 300a and the second ferrite magnetic core 300b are respectively formed in the formed two holes, Impedance matching is formed by forming a first coil 500a and a second coil 500b in the central nonmagnetic layer, and rotating the first ferrite magnetic core 300a and the second ferrite magnetic core 300b. Stackable common mode filter. The method of claim 6, The first coil 500a and the second coil 500b, When the first ferrite magnetic core 300a is formed counterclockwise or clockwise in the second ferrite magnetic core 300b, the multilayer common mode filter capable of impedance matching is formed in the clockwise or counterclockwise direction. The method of claim 6, The first coil 500a and the second coil 500b, A multilayer common mode filter capable of impedance matching, characterized in that the number of rotations and lengths formed in the first ferrite magnetic core (300a) and the second ferrite magnetic core (300b) are equally symmetrical. The method of claim 6, The central nonmagnetic layer, Via holes 600 formed around the first ferrite magnetic core 300a and the second ferrite magnetic core 300b, respectively, A stacked common mode filter capable of impedance matching, characterized in that a printed pattern (700) connecting the via holes is formed. The method of claim 6, When the first coil 500a and the second coil 500b are formed by being stacked on the central nonmagnetic layer, The first common coil formed in one layer and the second coil formed in the other layer is a multilayer common mode filter capable of impedance matching, characterized in that the rotationally symmetrical structure 180 degrees.

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