阅读说明：本技术 线圈架、电感部件和用于调节电感的方法 (Coil former, inductive component and method for adjusting inductance ) 是由 O·福尔萨 J·弗雷 S·韦伯 于 2020-05-27 设计创作，主要内容包括：本发明涉及一种用于电感部件(7)的线圈架(1)包括基体(2),所述基体的一些区域用电绝缘箔(3)包裹。一种电感部件(7)包括线圈架(1)和围绕其卷绕的绕线(8),使得箔(3)设置在基体(2)与绕线(8)之间。在用于调节电感的方法中,根据电感的目标值来选择箔(3)的长度。(The invention relates to a coil former (1) for an inductive component (7), comprising a base body (2), some areas of which are wrapped with an electrically insulating foil (3). An inductive component (7) comprises a coil former (1) and a winding (8) wound therearound such that a foil (3) is arranged between a base body (2) and the winding (8). In a method for adjusting the inductance, the length of the foil (3) is selected in accordance with a target value of the inductance.)

1. A coil former for an inductive component,

wherein the coil former (1) is designed as a carrier for a wound wire (8), wherein the coil former (1) comprises a base body (2), wherein regions of the base body (2) are covered with an electrically insulating foil (3).

2. A coil former according to claim 1,

wherein the substrate (2) is made of a non-magnetic material.

3. Coil former according to one of the preceding claims,

wherein the foil (3) is made of a non-magnetic material.

4. Coil former according to one of the preceding claims,

wherein the foil (3) has a maximum thickness of 100 μm.

5. Coil former according to one of the preceding claims,

wherein the foil (3) extends over at most two thirds of the length of the substrate (2).

6. Coil former according to one of the preceding claims,

comprises a recess (4), wherein the foil (2) is arranged in the recess (4).

7. A coil former according to claim 6,

wherein the recess (4) is helical and comprises at least two turns.

8. An inductive component comprising a coil former according to any one of the preceding claims,

and comprising a winding wire (8) wound around the coil former (1) such that the foil (3) is arranged between the winding wire (8) and the base body (2).

9. Inductive component according to claim 8, wherein the number of turns (k) of the foil (3) is at most two thirds of the number of turns (m) of the winding (8).

10. The inductance assembly according to any one of claims 8 or 9, wherein the coil former (1) comprises a recess (4), wherein the foil (3) and the winding wire (8) are arranged in the recess (4).

11. Method for adjusting the inductance value of an inductive component, wherein at least some regions of a base body (2) of a coil former (1) are wrapped with a foil (3), wherein the length of the foil (3) is selected in accordance with a target value of the inductance, and the coil former (1) is then wrapped with a winding (8) such that the foil (3) is arranged between the winding (8) and the base body (2) at least in some regions.

12. The method of claim 11, wherein the first and second light sources are selected from the group consisting of,

wherein the inductance of the component (7) is measured after wrapping with the winding (8), and the length of the foil (3) for another inductive component (7) is changed depending on the deviation of the measured value from a target value.

13. The method of claim 12, wherein the first and second light sources are selected from the group consisting of,

wherein the length (l) of the foil (3) varies in steps smaller than one turn of the foil (3) around the coil former (1).

14. A coil former for an inductive component,

wherein the coil former (1) comprises a restriction (5, 6) for positioning a winding (8), wherein the restriction (5, 6) is configured to position a section of the winding (8) in a central region of a winding (9).

15. A coil former according to claim 14,

wherein the restriction (5, 6) extends helically and comprises at least two turns.

16. Inductive component with a coil former according to one of claims 14 or 15 and a winding (8) which is positioned at least in sections along the restriction (5, 6).

Technical Field

The present invention relates to a coil former for an inductive component and to an inductive component comprising a coil former with a wire winding. This may be an air-core coil, i.e. a coil without a magnetic core. Inductive components are used in stereoscopic systems and the like.

Background

For many applications, it is desirable to precisely adjust the inductance value of a component over at least a statistical average of a set of inductances (batches). Resonant applications require in particular a highly accurate adjustment of the inductance.

The geometry strongly influences the inductance of the electrical components, in particular in the case of air coils. Highly accurate inductance values can only be generated within certain physical limits and require precise control of the geometry. For inductances with or without ferrite cores, variations in material properties and operating temperature also lead to variations in inductance values. Correcting for deviations in the inductance value of the finished part from the desired target value is referred to as "tuning" or "tuning".

Documents DE 3618122 a1, DE 3926231 a1, DE 19952192 a1 and DE 102008063312 a1 describe adjustable inductive components. The adjustment is usually achieved by pushing the soft magnetic material core into or out of the interior of the winding, or by pulling or compressing the winding.

Disclosure of Invention

It is an object of the present invention to provide an improved coil former, an improved inductive component and a method for adjusting the inductance of an inductive component.

According to a first aspect of the invention, a coil former is configured as a carrier for a winding of an inductive component. The coil former comprises a base body, at least some regions of which are wrapped with an electrically insulating foil. The diameter of the former is selectively increased by wrapping with foil. Thus, the inductance can be adjusted in a targeted manner after the winding has been wound onto the former and onto at least some areas of the foil.

In one embodiment, the base of the coil former is made of a non-magnetic material. This may be a plastic material, for example. Thus, the inductive component may be configured as an air core coil, i.e. not comprising a magnetic core around which the winding is wound. The former therefore serves only as a carrier for the windings and does not guide the magnetic flux. In such an embodiment, the inductance is particularly strongly dependent on the geometry, in particular the diameter, of the coil, so that a precise fine tuning by changing the diameter is possible.

For example, the thickness of the foil is significantly less than 1 mm. The maximum thickness of the foil is, for example, 100 μm. The thickness of the foil may in particular be between 10 and 40 μm.

In an alternative embodiment, the substrate may be made of a magnetic material. This may be a ferrite core, for example.

For example, the foil is wrapped helically around the substrate. The length of the foil and, if the geometry of the wrap is fixed, the number of turns of the foil around the substrate may also be defined according to a target value of the inductance. For example, the number of turns varies between one turn and four turns.

The foil is in particular arranged in such a way that the wound windings can be arranged on the envelope of the foil. The geometry of the envelope of the foil corresponds in particular to the geometry of the winding of the wire, wherein the envelope of the foil is preferably shorter than the winding of the wire. The wire windings may cover the entire length of the foil and extend beyond the foil. The winding may also cover the entire width of the foil.

In the following, the maximum possible effective length is the length of foil where the foil is present under the entire winding. The entire winding is thus applied over the enlarged diameter.

For example, in a first step the foil is applied to half the maximum effective length possible, followed by applying the winding and measuring the inductance of the component. The length of the foil is then reduced or increased for producing other components according to the measured inductance value. The initial application of the foil over only a part (e.g. half) of the maximum possible length is intended to provide flexibility for fine-tuning the length of the foil.

The foil in the resulting component does not extend over the entire length of the base body, for example, in particular over the maximum possible effective length of the foil. For example, the foil extends over no more than two-thirds of the length of the base body or the largest possible effective length. Alternatively, the foil extends over at least one third of the length of the base body or the maximum possible effective length. The foil may also extend over the entire maximum possible effective length at the beginning or in the tuning part, or there may be no foil.

Alternatively or additionally, the diameter and thus the inductance can optionally also be adjusted by changing the thickness of the foil or the number of layers of the foil. The foil may be applied to the substrate in one layer. However, to further vary the thickness, the foil may also be applied in multiple layers. For example, to adjust the inductance, initially a certain number of foil layers are present, and then one or more layers are removed or added depending on the measured inductance value. The foils may also have different thicknesses and the thickness of the foil may be varied for fine tuning. For example, the foil always extends over a maximum effective length. Alternatively, a combination of varying the length and varying the number of layers or thickness of the foil is also possible.

In one embodiment, the foil is made of a non-magnetic material. This may be a plastic material, for example. The foil may comprise the same material as the coil former. Thus, the foil is only used to increase the diameter of the coil former and not to guide the magnetic flux.

The coil former may comprise a recess in which the foil is disposed. The recess is configured for accurate placement of the foil and/or accurate placement of the winding.

For example, the configuration of the recess is circumferential. The recess extends in particular helically around the base body. The recess may extend circumferentially in a plurality of sections only around the base body or continuously around the base body. For example, the recess comprises at least two turns, in particular a continuous turn. For example, the recesses extend at least over the entire length of the foil. The recess is preferably configured not only for placing the foil, but also for placing the winding. The recess preferably extends over a substantial length of the base body.

The recess comprises lateral restrictions such that the foil and/or the winding are guided perpendicular to its travel in the main extension direction thereof in a slip-proof manner. The lateral confinement may be formed by the material of the base. The recess may in particular be formed directly during the manufacture of the substrate, for example in an injection moulding process. It is also possible to have only one lateral limitation for positioning.

For example, the foil is only slightly wider than the recess. The foil may also have the same width as the recesses or be slightly wider than the recesses. In this case, the foil may be fixed in the recess by clamping.

According to another aspect of the present invention, an inductive component includes the bobbin described previously and a wire wound around the bobbin. The foil is arranged between the winding and the base body at least in some areas, in particular over the area of the length of the winding. Thus, at least some area of the outer diameter of the coil former and hence of the inner diameter of the winding is increased. This results in an increase in the inductance of the component.

For example, the winding wire is configured as a flat wire. The winding can alternatively also be configured as a round wire. It may be a copper wire.

The inductance of the component is for example between 1 and 1000 nH. For example, by varying the length of the foil, the inductance can be adjusted in steps of 0.1% in a range up to 10% of the inductance, depending on the design.

The winding preferably extends over the entire length of the foil and, for example, also exceeds the length of the foil. The foil and the winding are in particular constructed as two uniform windings positioned on top of each other. The wound winding is preferably longer than the foil. Thus, the winding only covers a part of the foil in the main extension direction of the foil. For example, the ends of the winding extend beyond the foil on both sides.

The winding preferably comprises more windings than the foil. For example, the number of foil turns is at most two-thirds of the number of turns of the wire. For example, the wire comprises eight turns and the foil comprises five turns. Thus, there is sufficient flexibility to fine tune the inductance.

Thus, the diameter of the windings of the wire may be different in different regions. The diameter is particularly larger where the winding is provided on the foil.

According to one embodiment, the inductive component comprises a coil former having a recess, wherein at least some areas of the foil and the winding are arranged within the recess. The recess may be configured as described above for the coil former in particular. The recess may in particular be helical and comprise at least two turns. The windings may be slightly narrower than the recesses. The winding may also have the same width as the recess or be slightly wider than the recess. In this case, the winding can be fixed in the recess by clamping.

The foil may alternatively be glued to the base body. For example, the foil is self-adhesive. The foil may also be attached to the substrate by an applied adhesive. The windings may also be glued to the base. It is also possible to attach the foil to the winding first, for example by gluing the foil to the winding, and then to arrange and attach the winding together with the foil to the substrate.

The wire wrap and/or foil may alternatively be attached to the base by heat staking. In this process, after placing the foil and the winding in the recess, pressure and heat may be used to enlarge the radially protruding area of the restriction such that the foil and the winding are at least partially surrounded by the restriction in the radial direction. Here, it is also possible to attach the foil first by gluing and then to attach the winding by hot riveting.

According to another aspect of the present invention, a method for adjusting an inductance value of an inductive component is provided. In this case, at least some regions of the matrix of the coil former are wrapped with foil. The length of the foil is selected in accordance with a target value of the inductance. For a fixed geometry, the length corresponds to the number of turns of the foil.

The coil former is then wrapped with a winding such that the foil is disposed between the base and the winding at least in some regions, in particular along the region of the winding. The bobbin and the inductive component are constructed, for example, as described above.

For example, to adjust the length of the foil, the inductance of an inductive component of the same design is measured. The inductance can also be measured indirectly, i.e. as a different parameter of the measure of the inductance. The length of the foil for the further inductive component can then be changed depending on the deviation of the measured value from the target value.

For example, the length is gradually increased or decreased until a desired target value is reached. For example, the number of turns may vary from 1.00 to 4.00 turns. For example, the increment of the length change is less than one turn, e.g., 0.01 turn.

According to another aspect of the present invention, a bobbin for an inductance component includes a restriction portion for positioning a winding wire.

The restriction is in particular configured to guide a section of the winding in a central region of the winding; i.e. this is a section adjoining on both sides at least one further turn of the winding. This is therefore not an edge section of the winding. For example, the section is guided on both sides by two restrictions. The restriction thus forms a recess for accommodating at least one section of the winding.

The restriction or recess extends in particular helically around the base body of the coil former. For example, the restriction or recess comprises at least two turns. The recess can be formed in the base body of the coil carrier. The recess may also be configured for positioning a foil as described above. However, the coil former may also not comprise a foil. Otherwise, the bobbin may be constructed as described above.

According to another aspect of the present invention, an inductance component includes such a bobbin having a recess in which a winding wire is disposed. For example, the winding wire is configured as a flat wire. The foil may be arranged between the winding and the base of the former. Such a foil may also be absent. The inductive component may be otherwise configured as described above. The wire wrap is attached to the base as described above (e.g., by clamping, gluing, or heat staking).

The description of the objects provided herein is not limited to the specific embodiments. Rather, the features of the various embodiments can be combined with one another within technically reasonable limits.

Drawings

The object described here will be explained in more detail below on the basis of an exemplary design example.

The figures show:

figure 1 shows an embodiment of a coil former in a side view,

figure 2 shows an embodiment of the inductive component in a side view,

fig. 3A to 3E show a method for adjusting the inductance in schematic diagrams.

Detailed Description

In the following figures, identical reference numerals preferably refer to functionally or structurally equivalent parts of the various embodiments.

Fig. 1 shows a coil former 1 for an inductive component. The coil former 1 is designed as a wound carrier.

The coil former 1 is constructed in particular for air-core coils, i.e. coils in which there is no magnetic core. The coil former 1 is non-magnetic. The coil former 1 may comprise a base body 2 made of plastic. The coil former 1 is manufactured, for example, in an injection molding process. The inductance of an air core coil depends to a large extent on the geometry of the winding.

In an alternative embodiment, the coil former 1 can also be designed as a magnetic core, for example a ferrite core, or there can be a magnetic core in the coil former 1.

The base body 2 has in the present case a cylindrical shape. The substrate 2 may also have a different shape, for example a rectangular parallelepiped shape. The base body 2 may also be part of a larger body, for example a ring-shaped body. The base body 2 can be designed as a hollow body.

Some areas of the substrate 2 are wrapped with foil 3. The foil 3 is used to selectively increase the diameter of the substrate 2.

The foil 3 is thin, which allows to fine-tune the diameter of the substrate 2 and thus the inductance of the component after winding the winding on the foil 3. The thickness of the foil 3 is for example between 10 μm and 40 μm. The thickness of the foil 3 is for example 25 μm. In the present case, the foil 3 is applied in one layer.

The foil 3 comprises a non-magnetic material. The foil 3 may comprise or be made of a plastic material. The coil former 1 and the foil 3 may for example be made of the same material. In other embodiments, the foil 3 may comprise a magnetic material.

By selectively varying the length of the foil 3 corresponding to the number of turns k, the area of increased diameter can be selectively adjusted, thus allowing tuning of the inductance of the resulting component. In the present case, the foil 3 extends over 2.00 turns. For example, the number of turns of the foil 3 varies in the range of 1.00 to 4.00 turns. This change is made, for example, in 0.01 turn increments.

The coil former 1 further comprises recesses 4 which are configured for a precise positioning of the foil 3 and/or the winding wire 8. The foil 3 and/or the winding 8 can be positioned more accurately on the coil form 1 and the inductance of the component can be adjusted more accurately.

The recess 4 extends circumferentially around the base body 2. The recess 4 extends in particular helically around the base body 2 of the coil former 1. The recess 4 is delimited on both sides perpendicular to the circumferential direction by restrictions 5, 6. The restrictions 5, 6 likewise extend around the base body 2. Thus, the recess 4 is configured as a circumferential guiding groove/channel. In other words, the recess 4 is configured as a thread and the restrictions 5, 6 are configured as flanks.

The foil 3 is placed in the recess 4. The width of the foil 3 is similar to the width of the recesses 4. The foil 3 may be slightly narrower than the recess 4. The foil 3 may also be the same or slightly wider than the width of the recess 4 and be fixed in the recess 4 by clamping or gluing.

The winding 8 (see fig. 2) may also have a width similar to the width of the recess 4. For example, the width B of the recess 4 is at most 25% larger than the width B of the winding.

The recess 4 comprises n turns, whereby n in the present case is 8. Fewer or more than eight turns are also possible. The recess preferably comprises at least two turns.

In an alternative embodiment, the coil former 1 does not have a recess 4 for positioning the winding, but has a foil 3.

In a further alternative embodiment the coil former 1 does not have a foil for increasing the diameter, but has a recess 4 for accurately positioning the winding.

Fig. 2 shows an inductive component 7 comprising a coil former 1 and a winding wire 8 wound therearound, forming a winding 9. The coil former 1 can be designed according to fig. 1.

In the present case, the winding wire 8 is configured as a flat wire. The main surface of the winding 8 rests on the base body 2 of the coil former 1. The winding 8 may alternatively also be configured as a round wire. This is, for example, a copper wire.

In the present case, the winding wire 8 includes 7.50 turns. The maximum possible effective length of the foil 3 is thus likewise 7.50 turns. The winding 8 may also have more or fewer turns.

The winding 8 comprises two ends 10, 11. The end portions 10, 11 continue to connect, for example, the component 7 to contact terminals (not shown) or are provided with further contact connections (not shown).

Some areas of the winding 8 are arranged on the foil 3. The foil 3 is thus arranged between the base body 2 of the coil former 1 and the winding 8. In the area where the winding 8 is arranged on the foil 3, the diameter of the winding 9 increases. Thus, the winding 8 is arranged on the foil 3 in some areas, and in some areas directly on the base body 2, depending on the length or number of turns k of the foil 3. The diameter D of the winding 9 is thus increased only in some areas. The inductance of the component 7 increases in dependence on the size of the area with increasing diameter.

The winding wire 8 is arranged in the recess 4 for accurate positioning. The width B of the winding 8 may be only slightly smaller than the width B of the recess 4. The position of the winding 8 is thus precisely determined by the recess 4. The width B of the wire 8 may also be slightly larger than the width B of the recess 2, so that the wire 8 is fixed between the restrictions 5, 6 by clamping. The winding wire 8 may also be fixed in the recess 2 by heat staking. The radial end regions of the restrictions 5, 6 are widened, in particular by hot riveting, so that the winding 8 is at least partially surrounded radially outward by the end regions.

In one embodiment, the inductive component 6 does not have a recess in the bobbin 1 for positioning the winding 8, but a foil, as shown in fig. 1.

In the present case, the winding wire 8 is wound in one layer onto the coil former 1. In other embodiments, the winding wire 8 may also be wound onto the bobbin 1 in multiple layers.

In an alternative embodiment the inductive component 7 has no foil between the base body 2 and the winding 8, but has a recess 4 for accurate positioning of the winding 8. In this case, the diameter D of the winding 9 is uniform. Instead of a recess 4 with two restrictions 5, 6, there may also be only one restriction 5, 6 for positioning on one side. The recess 4 or the restrictions 5, 6 may also be constructed only in a plurality of sections.

Fig. 3A to 3E show method steps for adjusting the inductance of an inductive component.

According to fig. 3A, a coil former 1 is provided. The coil former 1 may be constructed as the coil former 1 of fig. 1. The coil former 1 may, but need not, comprise a recess 4.

According to fig. 3B, the length l of the foil 3 is defined, for example, according to a target value, based on an input measurement value "M". This information can be obtained by measuring the inductance of the same inductive component. If the measured inductance is smaller than the desired target value, a foil 3 is selected having a length l longer than the measured component. If the measured inductance is smaller than the desired target value, a foil 3 is selected having a shorter length l than the measured component.

The length l of the foil 3 corresponds to the number of turns k for a given coil former 1 and a given winding geometry. For example, the number of turns k varies in increments of 0.01 turn. For example, the number of turns is adjusted in the range of 1.00 to 4.00 turns.

According to fig. 3C, the foil 3 is wrapped around the substrate 2. In the present case, the number of turns is set to about 2.05. The foil 3 may also be first wrapped and then cut to the desired length l. For accurate positioning, the coil former 1 may comprise a spiral-shaped recess 4 (see fig. 1) and the foil 3 may be placed into the recess 4.

According to fig. 3D, the winding wire 8 is wound around the coil former 1 such that a winding 9 is formed. The foil 3 selectively increases the diameter D of the winding 9, as schematically shown here. The diameter of the section 7 varies depending on the thickness of the foil 3, in particular in the μm range. In the present case, the winding 8 is much longer than the foil 3. The winding 8 comprises at least one more turn than the foil 3. For example, the turns of the winding 8 are at least one third greater than the number of turns k of the foil 3. This allows a large degree of freedom in adjusting the inductance.

According to fig. 3E, a measured value M of the inductance is determined after the application of the winding 9. The length l of the foil 3 is defined for a set of components if the inductance is close enough to the target value. If the target value has not been reached, the length l of the foil 3 is further changed on the basis of the measured value M.

By adjusting the number of turns of the foil 3, a high precision adjustment of the inductance of the component 7 can be achieved. For example, depending on the design, the inductance can be very accurately adjusted in 0.1% increments in a range up to 10%. For example, the target value of the inductance is between 1 and 1000 nH.

List of reference numerals

1 coil rack

2 base body

3 foil

4 concave part

5 restriction part

6 restriction part

7 inductance component

8 winding

9 winding

10 ends of the winding

11 end of the winding

b width of the recess

Width of B winding

Number of turns of k foil

n number of turns of concave portion

m number of turns of winding

Diameter of the D winding

M measured value