JP2016201502A - Common noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a common noise filter that can perform well-balanced magnetical coupling among three coils.SOLUTION: A coil conductor 13a constituting a first coil 13, a coil conductor 14a constituting a second coil 14 and a coil conductor 15a constituting a third coil 15 are disposed in turn on a first insulator layer 11, and a coil conductor 14b constituting the second coil 14, a coil conductor 15b constituting the third coil 15, and a coil conductor 13b constituting the first coil 13 are arranged in turn on a second insulator layer 12. Further, with respect to both the first coil 13 and the second coil 14, both the second coil 14 and the third coil 15, and both the third coil 15 and the first coil 13 which are formed on the adjacent insulator layers 11 and 12, the coil conductors which constitute the respective both coils are overlapped with each other in a top view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small and thin common mode noise filter used in various electronic devices such as digital devices, AV devices, and information communication terminals.

  A conventional common mode noise filter of this type has a plurality of insulator layers 1 and three independent first to third coils 2 to 4 as shown in FIG. The coils 2 to 4 are formed by electrically connecting the coil conductors 2a and 2b, the coil conductors 3a and 3b, and the coil conductors 4a and 4b, respectively, and the three first to third coils 2 to 2 are formed. 4 were arranged in the stacking direction in order from the bottom.

  As a prior art document related to the invention of this application, for example, Patent Document 1 is known.

JP 2003-77727 A

  In the above-described conventional common mode noise filter, since the second coil 3 is disposed between the first coil 2 and the third coil 4, the first coil 2, the third coil 4, and the like. Thus, the first coil 2 and the third coil 4 were hardly magnetically coupled. In addition, since the first coil 2 and the second coil 3 have only one adjacent location, and the second coil 3 and the third coil 4 have only one adjacent location, the magnetic coupling is reduced. Therefore, the impedance of the common mode component cannot be increased, and as a result, the common mode noise removal characteristic is lowered.

  On the other hand, as shown in FIG. 4, the coil conductor 2a constituting the first coil 2, the coil conductor 3a constituting the second coil 3, the coil conductor 4a constituting the third coil 4, the first conductor The coil conductor 2b constituting the coil 2, the coil conductor 3b constituting the second coil 3, and the coil conductor 4b constituting the third coil 4 are laminated in this order, and the first coil 2 and the second coil 3 It is conceivable to increase the magnetic coupling by setting two locations where the two are adjacent to each other and two locations where the second coil 3 and the third coil 4 are adjacent to each other.

  However, in this case, since the first coil 2 and the third coil 4 have only one location adjacent to each other, the magnetic coupling is small compared to the other, and the magnetic coupling between the coils is poorly balanced. Have

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a common mode noise filter that can be magnetically coupled between three coils in a balanced manner.

  In order to solve the above-mentioned object, the present invention comprises first and second insulator layers stacked in order from above, and spiral coil conductors formed on the first and second insulation layers, A plurality of the coil conductors are electrically connected to form first to third coils that are independent from each other, the coil conductors constituting the first coil in the first insulator layer, the second coils The coil conductor constituting the coil and the coil conductor constituting the third coil are arranged in order, and the coil conductor constituting the second coil and the third coil are arranged on the second insulator layer. The coil conductors constituting the first coil and the coil conductors constituting the first coil are arranged in order, and the coil conductors constituting the first coil formed in the adjacent insulator layer and the second coil conductors. The coil conductor constituting the coil The coil conductor that constitutes the second coil, the coil conductor that constitutes the third coil, the coil conductor that constitutes the third coil, and the coil conductor that constitutes the first coil Each of them is configured such that at least a part thereof overlaps in a top view.

  In the common mode noise filter of the present invention, the coil conductor constituting the first coil and the coil conductor constituting the second coil are adjacent to each other in the vertical direction and the horizontal direction, and the coil conductor constituting the second coil is The coil conductor constituting the third coil is adjacent in the vertical direction and the horizontal direction, and the coil conductor constituting the third coil and the coil conductor constituting the first coil are adjacent in the vertical direction and the horizontal direction. As a result, the magnetic coupling between the three coils can be achieved in a substantially balanced manner.

1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention. The disassembled perspective view of the common mode noise filter in Embodiment 2 of this invention Exploded perspective view of a conventional common mode noise filter An exploded perspective view showing another example of the common mode noise filter

(Embodiment 1)
FIG. 1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the common mode noise filter according to the first exemplary embodiment of the present invention includes a first insulator layer 11, a second insulator layer 12, and the first insulator that are sequentially stacked from the top. A spiral first coil conductor 13a, a second coil conductor 14a, a third coil conductor 15a formed on the layer 11, and a spiral fourth coil conductor formed on the second insulator layer 12 13b, a fifth coil conductor 14b, a sixth coil conductor 15b, a first coil conductor 13a, a fourth coil conductor 13b, a second coil conductor 14a, a fifth coil conductor 14b, and a third coil conductor 13b. The coil conductor 15a and the sixth coil conductor 15b are electrically connected to each other to form the first coil 13, the second coil 14, and the third coil 15 that are independent from each other.

  In the above-described configuration, the first and second insulator layers 11 and 12 are stacked so as to be adjacent to each other via the via electrode insulator layer 16. The first and second insulator layers 11 and 12 and the via electrode insulator layer 16 are made of a non-magnetic material such as Cu-Zn ferrite, glass ceramic or Ni-Cu-Zn ferrite formed in a sheet shape. It is made of magnetic material. The second insulator layer 12 is located below the first insulator layer 11.

  The first coil conductor 13a, the second coil conductor 14a, and the third coil conductor 15a are respectively formed on the first insulator layer 11, and the fourth coil conductor 13b and the fifth coil conductor 15a are formed. One coil conductor 14b and one sixth coil conductor 15b are formed on the second insulator layer 12 one by one. Furthermore, by plating or printing a conductive material such as silver on the first and second insulator layers 11 and 12 in a spiral shape of one turn or more or less than one turn, the first to sixth coil conductors 13a, 13b, 14a, 14b, 15a, 15b are configured.

  The first coil 13 includes a first coil conductor 13a and a fourth coil conductor 13b, and the second coil 14 includes a second coil conductor 14a and a fifth coil conductor 14b. The third coil 15 includes a third coil conductor 15a and a sixth coil conductor 15b.

  Further, the first coil conductor 13a and the fourth coil conductor 13b constituting the first coil 13 include a via electrode 13c formed in the first insulator layer 11 and the via electrode insulator layer 16, and a via They are electrically connected via a routing conductor 13d formed in the electrode insulator layer 16. Similarly, the second coil conductor 14a and the fifth coil conductor 14b constituting the second coil 14 include a via electrode 14c formed on the first insulator layer 11 and the via electrode insulator layer 16, and They are electrically connected via a routing conductor 14d formed in the via electrode insulator layer 16. The third coil conductor 15a and the sixth coil conductor 15b constituting the third coil 15 include a via electrode 15c formed in the first insulator layer 11 and the via electrode insulator layer 16, and a via They are electrically connected via a routing conductor 15d formed in the electrode insulator layer 16.

  With such a configuration, three independent first coil 13, second coil 14, and third coil 15 are provided, and first coil 13, second coil 14, second coil 14, and second coil 14 are provided. The third coil 15, the third coil 15, and the first coil 13 are magnetically coupled to each other.

  At this time, the routing conductors 13d, 14d, and 15d constitute part of the first to third coils 13, 14, and 15, respectively. The via electrode insulator layer 16 may be formed on the upper surface of the first insulator layer 11.

  In the first insulator layer 11, the first coil conductor 13 a, the second coil conductor 14 a, and the third coil conductor 15 a are connected to one end in the longitudinal direction of the first and second insulator layers 11 and 12. Are arranged in order from the section toward the other end section (in order from the left side of the page), and are provided so as not to short-circuit each other. That is, no other coil conductor is arranged inside one coil conductor. The spiral direction is the same for each conductor in a top view.

  Similarly, in the second insulator layer 12, the fifth coil conductor 14b, the sixth coil conductor 15b, and the fourth coil conductor 13b are arranged in the longitudinal direction of the first and second insulator layers 11 and 12, respectively. Are arranged in order from one end portion to the other end portion (in order from the left side of the drawing), and are provided so as not to short-circuit each other. That is, no other coil conductor is arranged inside one coil conductor. The spiral direction is the same for each conductor in a top view.

  With the above configuration, the first coil conductor 13 a formed on the first insulator layer 11 and the fifth coil conductor 14 b formed on the second insulator layer 12 are formed on the first insulator layer 11. The formed second coil conductor 14a and the sixth coil conductor 15b formed on the second insulator layer 12 are connected to the third coil conductor 15a formed on the first insulator layer 11 and the second coil conductor 15b. In the fourth coil conductor 13b formed on the insulator layer 12, at least a part of the main part excluding the lead part overlaps in a top view.

  Therefore, the first coil conductor 13 a constituting the first coil 13 and the fifth coil conductor 14 b constituting the second coil 14 are adjacent in the vertical direction, and the second coil constituting the second coil 14. The conductor 14a and the sixth coil conductor 15b constituting the third coil 15 are adjacent in the vertical direction, and the third coil conductor 15a constituting the third coil 15 and the fourth coil constituting the first coil 13 are arranged. The coil conductors 13b are adjacent in the vertical direction.

  That is, in the longitudinal direction of the first and second insulator layers 11 and 12, the first coil 13 and the second coil 14 are vertically adjacent to each other at one end portion side, and the second coil 14 and the second coil 14 are adjacent to each other at the center portion. The third coil 15 is adjacent to the upper and lower sides, and the third coil 15 and the first coil 13 are adjacent to each other on the other end side.

  Further, an insulator layer 17 for the lead conductor is formed below the second insulator layer 12, and the fourth to sixth coil conductors 13b, 14b, 15b formed on the second insulator layer 12; Lead conductors 13e, 14e, and 15e connected via via electrodes 13c, 14c, and 15c, respectively, are provided. At this time, the lead conductors 13e, 14e, and 15e constitute part of the first to third coils 13, 14, and 15, respectively.

  If necessary, another insulator layer is laminated on the upper and lower surfaces of the first insulator layer 11 and the lead conductor insulator layer 17, and a laminate (not shown) is formed by these configurations. The Further, six external electrodes (not shown) connected to the end portions of the first to third coil conductors 13a, 14a, 15a and the end portions of the lead conductors 13e, 14e, 15e are provided on both end faces of the laminate. Is provided.

  Further, the first and second insulator layers 11 and 12, the via electrode insulator layer 16, and the lead conductor insulator layer 17 may all be made of a nonmagnetic material or a magnetic material. Or a combination thereof.

  As described above, in the common mode noise filter according to the first exemplary embodiment of the present invention, the first and fourth coil conductors 13a and 13b constituting the first coil 13 and the second and second coils 14 constituting the second coil 14 are provided. The fifth coil conductors 14a and 14b are adjacent to each other at two locations in the vertical direction (stacking direction) and the horizontal direction, and the second and fifth coil conductors 14a and 14b and the third coil constituting the second coil 14 are arranged. The third and sixth coil conductors 15a and 15b constituting the third coil 15 are adjacent to each other in three places in the vertical direction and two lateral directions, and the third and sixth coil conductors 15a constituting the third coil 15 are adjacent to each other. 15b and the first and fourth coil conductors 13a and 13b constituting the first coil 13 are adjacent to each other at two locations in the vertical direction and the horizontal direction. To let One in which the effect is obtained that the kill.

  Here, since the coupling between the coil conductors adjacent in the vertical direction is larger than the coupling between the coil conductors adjacent in the horizontal direction, the substantial magnetic coupling between the three coils is substantially equal.

  Further, it is preferable that the conductor lengths of the first to third coils 13, 14, 15 are substantially equal. For this purpose, the lengths of the routing conductors 13 d, 14 d, 15 d, the lead conductors 13 e, 14 e, 15 e May be adjusted as appropriate.

(Embodiment 2)
FIG. 2 is an exploded perspective view of the common mode noise filter according to Embodiment 2 of the present invention. In the second embodiment of the present invention, components having the same configurations as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 2, the second embodiment of the present invention differs from the first embodiment of the present invention in that there is a third gap between the second insulator layer 12 and the insulator layer 17 for the lead conductor. The third insulator layer 18 further includes a ninth coil conductor 15f constituting the third coil 15, a seventh coil conductor 13f constituting the first coil 13, and a second coil conductor 13f. This is that the eighth coil conductor 14 f constituting the coil 14 is arranged in order from one end portion in the longitudinal direction of the third insulator layer 18 toward the other end portion (in order from the left in the drawing). In the third insulator layer 18 as well, no other coil conductor is disposed inside one coil conductor, and the spiral direction of each conductor is the same in a top view.

  At this time, the fifth coil conductor 14b formed on the second insulator layer 12 and the ninth coil conductor 15f formed on the third insulator layer 18 are formed on the second insulator layer 12. The sixth coil conductor 15b and the seventh coil conductor 13f formed on the third insulator layer 18 are replaced with the fourth coil conductor 13b and the third insulator formed on the second insulator layer 12, respectively. The eighth coil conductors 14f formed on the layer 18 are overlapped with main portions excluding the lead portions in a top view.

  That is, the fourth coil conductor 13b constituting the first coil 13 and the eighth coil conductor 14f constituting the second coil 14 are adjacent in the vertical direction, and the fifth coil constituting the second coil 14 is formed. The conductor 14b and the ninth coil conductor 15f constituting the third coil 15 are adjacent in the vertical direction, and the sixth coil conductor 15b constituting the third coil 15 and the seventh coil constituting the first coil 13 are arranged. The coil conductors 13f are adjacent in the vertical direction.

  Further, the second and third insulator layers 12 and 18 are laminated so as to be adjacent to each other via another via electrode insulator layer 16. The other via-electrode insulator layers 16 are also provided with routing conductors 13d, 14d, and 15d that constitute parts of the first to third coils 13, 14, and 15, respectively. The other via electrode insulator layer 16 may be formed on the lower surface of the lead electrode insulator layer 17.

  Furthermore, via electrodes 13c, 14c, 15c are provided on the other via electrode insulator layer 16, and the routing conductors 13d, 14d, 15d and via electrodes 13c, 14c of the other via electrode insulator layer 16 are provided. 15, the fourth coil conductor 13 b and the seventh coil conductor 13 f constituting the first coil 13 are constituted by the fifth coil conductor 14 b and the eighth coil conductor 14 f constituting the second coil 14. The sixth coil conductor 15b and the ninth coil conductor 15f constituting the third coil 15 are electrically connected to each other.

  With the configuration as described above, the first coil 13, the second coil 14, and the third coil on one end side in the longitudinal direction of the first, second, and third insulator layers 11, 12, and 18. Arranged in order from the top, the second coil 14, the third coil 15, and the first coil 13 are arranged in the order from the top in the center, and the third coil 15, the first coil 13, The second coil 14 is arranged from the top in the order.

  With the above configuration, the first, fourth, and seventh coil conductors 13a, 13b, and 13f that constitute the first coil 13, and the second, fifth, and eighth coil conductors 14a that constitute the second coil 14. , 14b, 14f are adjacent to each other in a total of four places, two places in the vertical direction and two places in the horizontal direction, and the second, fifth, and eighth coil conductors 14a, 14b, and 14f constituting the second coil 14. The third, sixth, and ninth coil conductors 15a, 15b, and 15f constituting the third coil 15 are adjacent to each other in a total of four places, ie, two places in the vertical direction and two places in the horizontal direction. The third, sixth, and ninth coil conductors 15a, 15b, and 15f that constitute the first coil conductor 13 and the first, fourth, and seventh coil conductors 13a, 13b, and 13f that constitute the first coil 13 are two in the vertical direction. It is adjoined at a total of four places in two places in the horizontal direction. Therefore, it is possible to balance well the magnetic coupling between the three coils.

  Here, in each of the coils 13, 14, and 15, the number of coil conductors adjacent in the horizontal direction is equal to the number of coil conductors adjacent in the vertical direction, so that the magnetic coupling between the three coils is substantially equal.

  The common mode noise filter according to the present invention has an effect that it can be magnetically coupled between the three coils in a well-balanced manner, and is particularly small and thin for use in digital devices, AV devices, information communication terminals, and the like. This is useful in common mode noise filters and the like.

DESCRIPTION OF SYMBOLS 11 1st insulator layer 12 2nd insulator layer 13 1st coil 13a 1st coil conductor 13b 4th coil conductor 13f 7th coil conductor 14 2nd coil 14a 2nd coil conductor 14b 2nd 5th coil conductor 14f 8th coil conductor 15 3rd coil 15a 3rd coil conductor 15b 6th coil conductor 15f 9th coil conductor 18 3rd insulator layer

Claims (2)

A plurality of coil conductors electrically connected to each other, the first and second insulator layers stacked in order from the top; and spiral coil conductors formed on the first and second insulation layers. To form independent first to third coils, the coil conductor constituting the first coil on the first insulator layer, the coil conductor constituting the second coil, the third coil The coil conductors constituting the coil are arranged in order, the coil conductor constituting the second coil on the second insulator layer, the coil conductor constituting the third coil, the first coil The coil conductors constituting the first coil formed in the adjacent insulator layers, the coil conductors constituting the second coil, and the second coil conductors constituting the second coil. Constituting the coil of And the coil conductor constituting the third coil, and the coil conductor constituting the third coil and the coil conductor constituting the first coil are overlapped at least partially in a top view. Common mode noise filter. A third insulator layer is provided below the second insulator layer, and the coil conductor constituting the third coil and the coil conductor constituting the first coil are provided on the third insulator layer. The common mode noise filter according to claim 1, wherein the coil conductors constituting the second coil are arranged in order.

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