JP2016006830A - Inductor array - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductor array in which inductance values of a plurality of inductors can be matched.SOLUTION: A lead-out part 13b2 of an inductor 13 is positioned in the center of a magnetic substance 14, and a lead-out part 12b2 of an inductor 12 is positioned in the end. Therefore, inductance values L1 and L2 of the inductors 12 and 13 are different. The inductance values L1 and L2 of the two inductors 12 and 13 are then matched by making different a magnetic permeability μ of a material of the magnetic substance 14 in a peripheral region 16 of the lead-out part 13b2 of the inductor 13 presenting the different inductance value. In one embodiment, the inductor 13 presents the inductance value L2 greater than the inductance value L1 presented by the inductor 12, such that the magnetic permeability μ of the material of the magnetic substance 14 in the peripheral region 16 of the lead-out part 13b2 of the inductor 13 is set low.

Description

  The present invention relates to an inductor array in which a plurality of inductors are arranged inside a magnetic body.

  Conventionally, as this type of inductor array, for example, there is a multilayer ceramic electronic component disclosed in Patent Document 1. This multilayer ceramic electronic component is configured by vertically laminating two coil conductors in a ceramic sintered body. There is also a multilayer filter array disclosed in Patent Document 2. This multilayer filter array includes a coil portion including a plurality of coils and a capacitor portion including a plurality of capacitors. The coil portion is formed by laminating a plurality of insulator layers in which a plurality of conductor patterns are arranged in the horizontal direction, and a plurality of coils are arranged in the insulator in the horizontal direction. There is also an inductor array chip disclosed in Patent Document 3. This inductor array chip is formed by arranging a plurality of coil-shaped conductors between a plurality of magnetic layers, and a plurality of coils are arranged in a horizontal direction in the magnetic material.

JP 2003-234212 A JP 2010-268120 A JP2013-222841A

  However, in the inductor array configured by arranging a plurality of coils in the horizontal direction disclosed in the above-described conventional Patent Document 2 and Patent Document 3, there are coils having different inductance values, There was a problem that the inductance values were not uniform between the coils.

  For example, in the inductor array 1 showing a cross-sectional view in FIG. 1A, a plan view in FIG. 1B, and an equivalent circuit diagram in FIG. 1C, an inductance value L1, between two inductors 2 and 3 is shown. L2 is different. The two inductors 2 and 3 have coil conductors 2a and 3a wound in the same manner, generate magnetic fluxes φ1 and φ2 in parallel in the same direction, and are arranged side by side in a magnetic body 4 made of ferrite. Yes. In the array structure in which the inductors 2 and 3 are arranged side by side in this way, the left and right target structures are not centered on the center line c as in the plan view of the lead layer portion shown in FIG. The lead portions 2b and 3b that lead the winding ends of the conductors 2a and 3a to the external electrode always have an asymmetric pattern.

  In the structure shown in the figure, the lead portion 2b of the inductor 2 formed on the left side of the magnetic body 4 passes through almost the center of the magnetic body 4, but the lead portion 3b of the inductor 3 formed on the right side of the magnetic body 4 is magnetic. It passes through the end of the body 4. For this reason, since the magnetic flux generated by the lead portion 2b of the left inductor 2 passes through the magnetic body 4, the inductance acquisition efficiency in the lead portion 2b increases. On the other hand, since the region where the magnetic flux generated by the lead portion 3b of the right inductor 3 is distributed in the magnetic body 4 is narrow, the inductance acquisition efficiency in the lead portion 3b is low. As a result, the inductance value L1 of the left inductor 2 is about 10% larger than the inductance value L2 of the right inductor 3.

The present invention has been made to solve such problems,
In an inductor array in which a plurality of inductors in which conductors are wound in the same manner and generate magnetic flux in the same direction are arranged side by side inside the magnetic body,
The magnetic material has different magnetic permeability around some or all of the conductors forming the inductor that exhibits different inductance values among the multiple inductors, and the inductance values of the multiple inductors are aligned. It is characterized by.

  According to this configuration, part or all of the conductors can be obtained by changing the magnetic permeability of the magnetic material around a part or all of the conductors forming the inductors having different inductance values among the plurality of inductors. The inductance acquired by the magnetic flux generated in is adjusted by the magnetic permeability of the magnetic material through which the magnetic flux passes. And by this adjustment of the acquired inductance, the inductance values of the plurality of inductors are aligned.

  In addition, the present invention provides an inductor exhibiting different inductance values, for example, an inductor in which the lead-out portion for drawing the winding end portion of the conductor to the external electrode is not located at the end portion of the magnetic material is larger than the inductance value exhibited by other inductors. An inductance value is exhibited, and the magnetic permeability of the magnetic material around a part or all of the conductor is set low.

  According to this configuration, the magnetic flux generated in a part or all of the conductor is set by setting the magnetic permeability of the magnetic material around a part or all of the conductor forming the inductor exhibiting a large inductance value to be low. The inductance obtained by is adjusted small. And by this adjustment of the acquired inductance, the inductance value of the inductor exhibiting a large inductance value is matched with the inductance value exhibited by other inductors.

  Further, the present invention provides an inductor having different inductance values, for example, an inductor in which a lead-out portion that draws the winding end portion of the conductor to the external electrode is positioned at the end portion of the magnetic body is smaller than the inductance value that other inductors exhibit. It exhibits an inductance value, and the magnetic permeability of the magnetic material around a part or all of the conductor is set high.

  According to this configuration, the magnetic flux generated in a part or all of the conductor is set by setting the magnetic permeability of the magnetic material around the part or all of the conductor forming the inductor exhibiting a small inductance value to be high. The inductance obtained by is greatly adjusted. And by this adjustment of the acquired inductance, the inductance value of the inductor exhibiting a small inductance value is matched with the inductance value exhibited by other inductors.

  Further, the present invention is characterized in that a part of the conductor is a lead-out portion that pulls out a winding end portion of an inductor exhibiting a different inductance value to an external electrode, or a winding intermediate portion of an inductor exhibiting a different inductance value. .

  According to this configuration, the magnetic permeability of the magnetic material around the lead-out portion that draws out the winding end portion of the inductor exhibiting different inductance values to the external electrode or the conductor in the middle of winding of the inductor exhibiting different inductance values is different. By doing so, the inductance acquired by the magnetic flux generated in the lead portion or the conductor portion in the middle of winding is adjusted, and the inductance values of the plurality of inductors are aligned.

  In addition, the present invention provides an inductor exhibiting different inductance values so that the lead-out portion that pulls out the winding end portion of the conductor to the external electrode does not intersect the magnetic core region surrounded by the conductor in the winding middle portion of the inductor, It is drawn out to an external electrode.

  According to this configuration, since the lead portion does not intersect the magnetic core region of the magnetic material, the magnetic flux passing through the magnetic core region is not blocked by the lead portion. For this reason, the magnitude | size of the magnetic flux which passes a magnetic core area | region can be ensured, and it can arrange | equalize each inductance value of a several inductor, without impairing the direct current superimposition characteristic of the inductor which exhibits a different inductance value.

  Further, the present invention is characterized in that the magnetic permeability of the magnetic core region surrounded by the conductors forming the inductors having different inductance values is not changed.

  According to this configuration, since the magnetic permeability of the magnetic core region of the magnetic material is not changed, the magnitude of the magnetic flux passing through the magnetic core region can be ensured. For this reason, even with this configuration, the inductance values of a plurality of inductors can be made uniform without impairing the DC superimposition characteristics of inductors exhibiting different inductance values.

  According to the present invention, it is possible to provide an inductor array in which the inductance values of a plurality of inductors are aligned.

(A) is sectional drawing of the conventional inductor array, (b) is a top view, (c) is an equivalent circuit schematic. (A) is a top view of the inductor array by one Embodiment of this invention, (b) is sectional drawing. FIG. 3 is an exploded plan view of the inductor array according to the embodiment shown in FIG. 2. (A) is a top view of the inductor array by the 1st modification of one Embodiment, (b) is sectional drawing. (A) is sectional drawing of the inductor array by the 2nd modification of one Embodiment, (b) is sectional drawing of the inductor array by the 3rd modification, (c) is the inductor array by the 4th modification. It is sectional drawing.

  Next, the form for implementing the inductor array of this invention is demonstrated.

  FIG. 2A is a plan view of the inductor array 11 according to the embodiment of the present invention, and FIG.

  The inductor array 11 includes two inductors 12 and 13 arranged side by side inside a magnetic body 14 made of ferrite. The outer dimensions of the inductor array 11 are 2520 sizes (long side 2.5 mm × short side 2.0 mm), and thickness T = 1.0 mm. In the inductors 12 and 13, the coil conductors 12a and 13a are wound in the same manner, and magnetic fluxes φ1 and φ2 are generated in parallel in the same direction.

  The inductor array 11 is a laminated ferrite inductor array, and is formed by laminating the magnetic layers 14a constituting the magnetic body 14 as shown in the exploded plan view of FIG. Conductor patterns 12a1 and 13a1 are formed on the lowermost magnetic layer 14a, and first lead portions 12b1 and 13b1 are extended from the conductor patterns 12a1 and 13a1. Above the lowermost magnetic layer 14a, magnetic layers 14a on which the conductor patterns 12a2 and 13a2 are formed and magnetic layers 14a on which the conductor patterns 12a1 and 13a1 are formed are alternately stacked. Second lead portions 12b2 and 13b2 are formed on the uppermost magnetic layer 14a. Each conductor pattern 12a1, 12a2, 13a1, 13a2 and each lead-out part 12b1, 12b2, 13b1, 13b2 are made of a conductive material such as Ag.

  Each of the conductor patterns 12a1, 12a2 and the lead-out part 12b2 constitutes the coil conductor 12a by laminating the respective magnetic layers 14a and spirally connecting via via-hole conductors 15a indicated by alternate long and short dash lines. One winding end of the coil conductor 12a is connected to an external electrode (not shown) via a first lead portion 12b1 and the other winding end portion is connected to a second lead portion 12b2. In addition, each conductor pattern 13a1, 13a2 and lead portion 13b2 constitutes a coil conductor 13a by laminating each magnetic layer 14a and spirally connecting via via-hole conductors 15b indicated by alternate long and short dash lines. One winding end of the coil conductor 13a is connected to an external electrode (not shown) via a first lead portion 13b1 and the other winding end portion is connected to a second lead portion 13b2.

  In the present embodiment, the lead portion 13b2 of the inductor 13 is located at the center of the magnetic body 14, and the lead portion 12b2 of the inductor 12 is located at the end of the magnetic body 14. Therefore, the inductance values L1 and L2 of the inductors 12 and 13 are L1 when the coil conductors 12a and 13a and the lead portions 12b1, 12b2, 13b1, and 13b2 are all in the magnetic body 14 having the same permeability μ. = 0.524 μH and L2 = 0.582 μH, which are different. That is, the inductance value L2 of the inductor 13 is about 10% larger than the inductance value L1 of the inductor 12. However, in the present embodiment, the magnetic permeability μ of the material of the magnetic body 14 in the peripheral region 16 of the lead-out portion 13b2 of the inductor 13 that exhibits different inductance values between the two inductors 12 and 13 is made different. The inductance values L1 and L2 of the inductors 12 and 13 are aligned. In the present embodiment, as described above, the inductor 13 exhibits an inductance value L2 that is larger than the inductance value L1 exhibited by the inductor 12, and therefore, the permeability of the material of the magnetic body 14 in the peripheral region 16 of the lead portion 13b2 of the inductor 13. Magnetic susceptibility μ is set low.

Table 1 below shows the inductance values L1 and L2 of the inductors 12 and 13 when the dimensions of the height H and width W (see FIG. 2B) of the rectangular region 16 are changed. Yes.

  In the case where the height H and width W of the region 16 are both 0 mm shown in the uppermost part of the above table, the coil conductors 12a and 13a and the lead portions 12b1, 12b2, 13b1 and 13b2 all have the same magnetic permeability μ. A conventional inductor array in the magnetic body 14. In this case, the difference between the inductance values L1 and L2 of the inductors 12 and 13 is 10.0%. Further, the inductor 12 in which the coil conductor 12a and each of the lead portions 12b1 and 12b2 are all in the magnetic body 14 having the same magnetic permeability μ has an inductance value regardless of changes in the height H and width W of the region 16. L1 maintains a constant value. However, in the inductor 13 in which the magnetic permeability μ of the material of the magnetic body 14 in the peripheral region 16 of the lead portion 13b2 is set to be low, the inductance value increases as the height H and width W of the region 16 increase. L2 becomes smaller. The inductance value L2 of the inductor 13 is almost the same as the inductance value L1 of the inductor 12 with the height of the lowermost stage being 0.15 mm and the width of 0.5 mm, and the difference between the two becomes 0.2%. , 13 are equal in inductance value L1, L2.

  As described above, according to the inductor array 11 of the present embodiment, the magnetic permeability μ of the material of the magnetic body 14 in the peripheral region 16 of the lead portion 13b2 that forms the inductor 13 exhibiting a different inductance value between the two inductors 12 and 13. Is appropriately varied, the inductance acquired by the magnetic flux generated by the lead portion 13b2 is adjusted by the magnetic permeability μ of the magnetic body 14 in the region 16 through which the magnetic flux passes. Then, by adjusting the acquired inductance, the inductance values L1 and L2 of the two inductors 12 and 13 are aligned. In the present embodiment, as described above, the permeability μ of the material of the magnetic body 14 in the peripheral region 16 of the lead portion 13b2 that forms the inductor 13 exhibiting the large inductance value L2 is set low, so that the lead portion 13b2 The inductance obtained by the magnetic flux generated in is adjusted to be small. And by this adjustment of the acquired inductance, the inductance value L2 of the inductor 13 exhibiting a large inductance value is matched with the inductance value L1 exhibited by the other inductors 12.

  Further, in the inductor array 11 of the present embodiment, the lead portion 13b2 of the inductor 13 does not intersect the magnetic core region 17 (see FIG. 2) of the magnetic body 14 surrounded by the conductor patterns 13a1 and 13a2 in the winding middle portion of the inductor 13. Thus, the magnetic flux φ2 passing through the magnetic core region 17 is not blocked by the lead portion 13b2. For this reason, the magnitude | size of magnetic flux (phi) 2 which passes the magnetic core area | region 17 can be ensured, and each inductance value L1, L2 of the two inductors 12 and 13 can be arrange | equalized, without impairing the direct current | flow superimposition characteristic of the inductor 13. .

  In the above embodiment, the case where the peripheral region 16 of the lead portion 13b2 of the inductor 13 protrudes from the magnetic core region 17 has been described. However, as in the first modification shown in FIG. 4, the region 16 a that does not protrude from the magnetic core region 17 is set around the lead portion 13 b 2, and the permeability μ of the magnetic core region 17 of the magnetic body 14 is not changed. With the configuration, the magnitude of the magnetic flux φ2 that passes through the magnetic core region 17 can be secured. In the figure, the same or corresponding parts as those in FIG. For this reason, even with this configuration, the inductance values L1 and L2 of the two inductors 12 and 13 can be made uniform without impairing the DC superposition characteristics of the inductor 13.

  In the above-described embodiment, a case has been described in which part of the conductor forming the inductor 13 is the lead portion 13b2, and the magnetic permeability μ of the material of the magnetic body 14 in the peripheral region 16 of the lead portion 13b2 is varied. However, a part of the conductor forming the inductor 13 is a region 18 around the coil conductor 13a in the middle of winding of the inductor 13, as shown in the cross-sectional view of the second modification shown in FIG. Also good. Further, as shown in the cross-sectional view of the third modification shown in FIG. 4B, the entire peripheral region 19 of the coil conductor 13a and the lead portions 13b1 and 13b2 of the inductor 13 may be used. 5 that are the same as or correspond to those in FIG. 2B are assigned the same reference numerals, and descriptions thereof are omitted.

  According to this configuration, the magnetic permeability μ of the material of the magnetic body 14 in the conductor peripheral region 18 in the middle of winding of the inductor 13 exhibiting different inductance values or in all the conductor peripheral regions 19 of the inductor 13 exhibiting different inductance values is obtained. By making it different, the inductance acquired by the magnetic flux generated in the winding middle part of the inductor 13 or all the conductor parts is adjusted, and the inductance values L1 and L2 of the two inductors 12 and 13 are made uniform.

  Further, in the above-described embodiment, the inductor having a different inductance value exhibits an inductance value larger than that of the inductor 12 because the lead portion 13b2 is positioned at the center portion of the magnetic body 14 and not at the end portion of the magnetic body 14. The case of the inductor 13 has been described. However, the inductor that exhibits a different inductance value may be the inductor 12 that exhibits the inductance value smaller than that of the inductor 13 with the lead portion 12b2 positioned at the end of the magnetic body 14.

  In this case, the magnetic permeability μ of the material of the magnetic body 14 in a part of the coil conductor 12a forming the inductor 12 exhibiting a small inductance value or the conductor peripheral region of the entire inductor is set high, so that a part of the coil conductor 12a is formed. Or the inductance acquired with the magnetic flux produced | generated by the conductor of all the inductors is adjusted greatly. For example, as in the fourth modification shown in FIG. 5C, the magnetic permeability μ of the material of the magnetic body 14 in the peripheral region 20 of the lead portion 12b2 of the coil conductor 12a is set high, so that the lead portion 12b2 The inductance obtained by the magnetic flux generated at is greatly adjusted. And by this adjustment of the acquired inductance, the inductance value L1 of the inductor 12 exhibiting a small inductance value is matched with the inductance value L2 exhibited by the inductor 13.

  Moreover, the case where the inductor array 11 of the above-described embodiment is composed of two inductors 12 and 13 has been described. However, the inductor array 11 may be composed of three or more inductors. Also in this configuration, the magnetic permeability μ of the material of the magnetic body 14 in the periphery of a part or all of the conductors forming the inductors exhibiting different inductance values among the plurality of inductors is changed, so that a part of the conductors or The inductance acquired by the magnetic flux generated in total is adjusted by the magnetic permeability μ of the magnetic body 14 through which the magnetic flux passes. And by this adjustment of the acquired inductance, the inductance values of the plurality of inductors are aligned, and the same effect as the inductor array 11 according to the above-described embodiment is exhibited.

  The inductor array of the present invention is used for various inductor arrays that are required to have the same inductance value for each inductor, for example, an inductor array that forms a smoothing circuit with a capacitor in a multi-phase DC / DC converter. be able to.

DESCRIPTION OF SYMBOLS 11 ... Inductor array 12, 13 ... Inductor 12a, 13a ... Coil conductor 12a1, 12a2, 13a1, 13a2 ... Conductor pattern 12b1, 12b2, 13b1, 13b2 ... Lead-out part 14 ... Magnetic body 14a ... Magnetic body layer 15a, 15b ... Via-hole conductor 16, 16a, 18, 19, 20 ... conductor peripheral region 17 ... magnetic core region of magnetic body 14 φ1, φ2 ... magnetic flux

Claims (8)

In an inductor array in which a plurality of inductors in which conductors are wound in the same manner and generate magnetic flux in the same direction are arranged side by side inside the magnetic body,
The magnetic material has different permeability around a part or all of the conductor forming the inductor exhibiting different inductance values among the plurality of inductors, and the inductance values of the plurality of inductors are aligned. An inductor array characterized in that   The inductor exhibiting a different inductance value exhibits an inductance value larger than the inductance value exhibited by the other inductors, and the magnetic material has a low permeability around a part or all of the conductor. The inductor array according to claim 1.   3. The inductor array according to claim 2, wherein the inductor exhibiting different inductance values is an inductor in which a lead-out portion that pulls out a winding end portion of the conductor to an external electrode is not located at an end portion of the magnetic body.   The inductor exhibiting a different inductance value exhibits an inductance value smaller than the inductance value exhibited by the other inductors, and the magnetic material has a high permeability around a part or all of the conductor. The inductor array according to claim 1.   5. The inductor array according to claim 4, wherein the inductor exhibiting different inductance values is an inductor in which a lead-out portion that pulls out a winding end portion of the conductor to an external electrode is located at an end portion of the magnetic body.   The part of the conductor is a lead-out portion that pulls out a winding end portion of the inductor exhibiting a different inductance value to an external electrode, or a winding intermediate portion of the inductor exhibiting a different inductance value. The inductor array according to claim 5.   In the inductor exhibiting different inductance values, the lead-out portion that draws the winding end portion of the conductor to the external electrode does not intersect the magnetic core region of the magnetic body surrounded by the conductor in the winding middle portion of the inductor, The inductor array according to any one of claims 1 to 6, wherein the inductor array is drawn out to an external electrode.   8. The inductor array according to claim 1, wherein a magnetic permeability region of the magnetic core region surrounded by the conductor that forms the inductor exhibiting different inductance values is not changed. 9. .

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