Passive Electrotechnical Components

Abstract

The present invention relates to a passive electrical component for attenuating common mode and differential mode noise on at least two electrical conductors leading to the passive electrical component, the passive electrical component having two toroidal cores with at least two windings disposed on each toroidal core, with both windings wound and / or connected on the first toroidal core to provide high attenuation of common mode signals on the electrical conductors, and with a winding wound and / or connected on the second toroidal core to provide high attenuation of differential mode noise on the electrical conductors.

Description

[Technical Field]

[0001] The present invention relates to passive electrotechnical components. [Background technology]

[0002] From DE 10 05 04 14 A1 a separating element for an annular core choke is known, which is constructed in two parts, the first part being telescopingable within the second part.

[0003] From the abstract of US Pat. No. 5,949,549 a common mode choke is known.

[0004] Another common mode choke is known from US Pat. No. 5,629,999. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] German Patent Application Publication No. 10201206171 [Patent Document 2] Japanese Patent Application Publication No. 03-062506 [Patent Document 3] US Patent Application Publication No. 2008 / 0129438 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to improve passive electrotechnical components. [Means for solving the problem]

[0007] According to the invention there is provided for this a passive electrotechnical component having the features of claim 1. Preferred developments of the invention are set out in the subclaims.

[0008] The passive electrotechnical component according to the present invention is provided for attenuating common-mode and differential-mode noise on at least two electrical conductors leading to the component and comprises two toroidal cores with at least two windings disposed on each of the toroidal cores, the two windings on the first toroidal core being wound and / or connected to provide high attenuation of common-mode signals on the electrical conductors, and the windings on the second toroidal core being wound and / or connected to provide high attenuation of differential-mode noise on the electrical conductors.

[0009] Common-mode noise is noise that has substantially equal signal levels on at least two conductors that also carry a useful signal. Therefore, common-mode noise cannot be measured between the two conductors. Differential-mode noise is also known. Differential-mode noise has different voltage levels on at least two conductors that also carry a useful signal. Therefore, differential-mode noise can be measured between two conductors that also carry a useful signal. Both common-mode and differential-mode noise impair the quality and usefulness of the useful signal. The passive electrotechnical component of the present invention allows for simultaneous attenuation of common-mode and differential-mode noise. The electrotechnical component of the present invention combines a common-mode choke with a differential-mode choke. The common-mode choke has a first annular core on which two windings are arranged. The differential-mode choke has a second annular core on which two windings are also arranged. The windings on the first toroidal core of the common-mode choke are wound and / or connected so that the magnetic fluxes caused by common-mode noise on different conductors and therefore different windings add up within the toroidal core, thereby attenuating the common-mode noise. In contrast, the magnetic fluxes generated by the useful signal on the first toroidal core cancel each other out, resulting in virtually no attenuation of the useful signal. In the second toroidal core of the differential mode choke, the differential noise on different conductors and therefore different windings generates magnetic fluxes that add up. This attenuates the differential noise in the second toroidal core of the differential choke. The material of the second toroidal core is selected so that it reaches saturation later to avoid saturation of the second toroidal core during normal operation. The inductance of the differential choke must be selected so that the useful signal is not strongly attenuated, and only the differential noise is attenuated. This is possible because the differential noise and the useful signal are in different frequency ranges.

[0010] In a development of the invention, the first annular core is made from ferrite, in particular from manganese-zinc-ferrite.

[0011] This allows for high common mode attenuation within the common mode choke.

[0012] In a development of the invention, the second annular core is made from iron, in particular from iron powder.

[0013] A toroidal core made of iron or iron powder has high saturation, which avoids saturation of the differential mode choke in normal operation, so that the inductance is large enough for attenuation of the differential mode signal.

[0014] In a development of the invention, the two annular cores are arranged on a common base.

[0015] This allows for a very compact arrangement.

[0016] In a development of the invention, the two annular cores are arranged parallel to each other and with their through holes aligned.

[0017] This also results in a very compact and space-saving arrangement.

[0018] In a development of the invention, the two toroidal cores have the same geometric dimensions, the diameter and material of the winding wire used for all windings are equal and / or the number of turns of all windings is the same.

[0019] In this way, passive electrotechnical components according to the invention can be produced automatically in high numbers and at favorable costs.

[0020] In a development of the invention, a passive electrotechnical component has two toroidal cores and a base, on which the toroidal cores are arranged, and on each toroidal core two spatially separated windings are arranged, so that on each toroidal core a first winding is arranged on a first angular region of the toroidal core and a second winding is arranged on a second angular region of the toroidal core, the first and second angular regions being different from each other and not overlapping, and a holding and separating element is provided, which is connected on the one hand to the base and on the other hand fits into the internal space of each toroidal core, in which case the holding and separating element is formed integrally, and the holding and separating element does not separate the two separating elements. the first separating section abuts against the inner circumference of the first annular core at at least two spaced apart contact locations, thereby separating a first angular region for the first winding on the first annular core from a second angular region for the second winding on the first annular core from each other on the inner circumference of the first annular core, and the second separating section abuts against the inner circumference of the second annular core at at least two spaced apart contact locations, thereby separating a first angular region for the first winding on the second annular core from a second angular region for the second winding on the second annular core from each other on the inner circumference of the second annular core.

[0021] A single retaining and separating element can be used to hold the two toroidal cores in place on the base and separate the two windings on the first toroidal core from each other. Furthermore, a retaining and separating element can also be used to separate the two windings on the second toroidal core from each other. This makes the passive electrotechnical component suitable for network applications with voltages of, for example, 250 V. This is because the separation of the two windings on the first toroidal core from the two windings on the second toroidal core reliably prevents short circuits between the two windings on the first toroidal core and the two windings on the second toroidal core. This also applies when the passive component is subjected to significant acceleration or vibration.

[0022] In a development of the present invention, the two annular cores are arranged parallel to each other, and in this case, an attachment section of the holding and separating member is arranged between a first side surface of the first annular core and a second side surface of the second annular core facing the first side surface of the first annular core, and the first side surface of the first annular core and the second side surface of the second annular core are attached to the attachment section.

[0023] By using the retaining and separating member, the two annular cores can be held at a precisely defined distance from each other, since both the first annular core and the second annular core are attached to the attachment section of the retaining and separating member.

[0024] In a development of the invention, the holding and separating member is formed in the shape of a plate.

[0025] In this way, the retaining and separating members can be produced at favorable cost, and the elastic properties of the retaining and separating members can be determined by the cutouts or notches in the retaining and separating members.

[0026] In a development of the invention, at least the separating section of the holding and separating member is made elastically deformable.

[0027] In this way, the separation section can be introduced into the annular core, for example, by compressing it. After the external force is removed, the separation section elastically returns and thereby firmly presses against the inner circumference of the annular core at the first and second contact points. For example, the separation section can be fitted into the inner space of the annular core.

[0028] In a development of the invention, the separation sections each have at least one notch, which extends from the edge of the holding and separating member into the separation section.

[0029] In this way, the elasticity of the separating sections can be adjusted depending on the length of the respective cuts.

[0030] In a development of the invention, the two separation sections are joined to one another and the elongated notch / through hole extends from the first separation section into the second separation section.

[0031] In this way too, the elastic deformability of the two separate sections can be adjusted.

[0032] In a development of the present invention, two notches are provided in each separation section, which extend straight from the edge of the separation section into the separation section in opposite directions, and the elongated notch / through hole is arranged parallel to the two notches.

[0033] In this way, two elastically deformable locking arms are formed in each separation section, which are first elastically compressed when sliding into the inner space of the annular core, and can elastically expand again after reaching a predetermined final position.

[0034] In a development of the invention, at least one locking lug is provided at each free end of the separating sections for gripping the rear side of the respective annular core.

[0035] In this way, the holding and separating member can be locked onto the inner periphery of the annular core.

[0036] In a development of the invention, two opposing locking lugs are provided at the free end of each separation section for gripping the rear side of the respective annular core at two opposing points.

[0037] In this way, to introduce each separation section into the annular core, it can be simply compressed to a dimension such that the distance between the two opposing locking tabs is slightly smaller than the inner diameter of the annular core. After insertion and when the locking tabs have completely traversed the inner space of the annular core, they can again be elastically spread radially outward, thereby securely fixing the separation section in the annular core.

[0038] In a development of the invention, the base section of the holding and separating member is inserted into a notch in the base.

[0039] This allows the holding and separating element to be fastened to the base in a very simple manner.

[0040] In a development of the invention, the holding section is made elastically deformable.

[0041] This allows the holding and separating element to be reversibly fastened to the base in a very simple manner: for example, two annular cores are fastened onto the separating sections of the holding and separating element in the wound state, and then the base sections of the holding and separating element are fastened to the base, in each case without tools and possibly fully automatically.

[0042] In a development of the invention, the holding section has at least one notch, which extends from an edge of the holding and separating member into the holding section.

[0043] In this way, elastic deformability of the holding section can be ensured, particularly in plate-shaped holding and separating elements.

[0044] In a development of the invention, the holding and separating member is formed as a plastic injection-molded part.

[0045] In this way, cost-effective production in large quantities is possible without any problems.The plastics used must have the desired electrical insulating properties.

[0046] In a development of the invention, the base is provided with cutouts starting from the sides of the base in order to guide the wound wire underneath the base.

[0047] In this way, the winding wires do not have to extend beyond the contour of the base, which makes the passive electrotechnical component according to the invention easier to handle and in particular the winding wires are arranged in a protected manner.

[0048] In a development of the invention, the base is provided on its underside, facing away from the annular core, with contact surfaces or contact pins.

[0049] For example, contact surfaces can be provided on the underside of the base and configured as SMD components. The winding wires are then guided to the contact surfaces and electrically connected to them. Alternatively, contact pins can be provided on the underside of the base, which are also connected to the winding wires.

[0050] Other features and advantages of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention in conjunction with the drawings in which: [Brief explanation of the drawings]

[0051] [Figure 1] FIG. 1 shows diagrammatically the electrical structure of a passive component according to the invention. [Figure 2] FIG. 2 is a view showing the passive component according to the present invention from diagonally above. [Figure 3] FIG. 3 is a first cross-sectional view of the component of FIG. [Figure 4] FIG. 4 is a second cross-sectional view of the component of FIG. [Figure 5] FIG. 5 is a perspective view showing the passive component holding and separating member according to the present invention shown in FIG. 2 from diagonally above. [Figure 6] FIG. 6 shows a front view of the holding and separating member of FIG. [Figure 7] FIG. 7 is a view showing the passive component of FIG. 2 from diagonally below. DETAILED DESCRIPTION OF THE INVENTION

[0052] 1 shows a schematic diagram of the electrical structure of a passive component according to the present invention. The component according to the present invention comprises a common mode choke (CMC) and a differential mode choke (DMC). The common mode choke (CMC) attenuates common mode signals on the electrical conductors 1 and 2 leading to the passive component 10 according to the present invention. The two conductors can be further guided at connection ends 3 and 4.

[0053] Common mode noise on two conductors 1, 2 refers to a signal that has substantially the same voltage on the two conductors 1, 2. Common mode noise is caused, for example, by the two conductors 1, 2 acting as antennas when viewed from their own perspective. Common mode noise on conductors 1, 2 cannot be determined by measurements between the two conductors 1, 2, because the common mode noise has substantially the same voltage or potential on the two conductors 1, 2.

[0054] The common mode choke CMC has a schematic toroidal core 12 and a first winding 14 and a second winding 16 on the first toroidal core 12. The two windings 14 and 16 are wound on the toroidal core 12 so that the magnetic flux induced in the first toroidal core 12 by common mode noise on conductor 1 and the magnetic flux induced in the first toroidal core 12 by common mode noise on conductor 2 are added together. This converts the electrical energy of the common mode noise into magnetic energy, which is then attenuated in the first toroidal core 12. The first toroidal core 12 is made of ferrite. Manganese-zinc ferrite has been shown to be effective within the scope of the present invention.

[0055] The two windings 14, 16 on the first toroidal core 12 have the same number of turns and are made of the same wire having the same thickness and ohmic resistance. Because the two windings 14, 16 are wound in the same direction on the toroidal core 12, the magnetic fluxes generated through the two windings 14, 16 add up within the toroidal core 12 in the event of a common-mode signal.

[0056] Alternatively, the two windings 14, 16 can have different winding directions on the first toroidal core 12. In this case, however, the common mode choke CMC must be connected differently to the two conductors 1, 2, so that the magnetic fluxes generated by common mode noise on the two conductors 1, 2 again add up in the first toroidal core 12. This can be done, for example, by connecting conductor 1 to the top right connection end of the common mode choke CMC in Figure 1 rather than to the top left connection end of the common mode choke CMC in Figure 1.

[0057] When a useful signal is transmitted on the two conductors 1, 2, this useful signal has a potential difference between the two conductors 1, 2. The useful signal can therefore be measured between the two conductors 1, 2. When the useful signal is applied to the common mode choke CMC via the two conductors 1, 2, the magnetic fluxes generated by the useful signal in the two windings 14, 16 cancel each other out. The useful signal is therefore practically not attenuated by the common mode choke CMC.

[0058] The component 10 according to the present invention further includes a differential mode choke (DMC). The differential mode choke DMC includes a second toroidal core 18, a first winding 20 on the second toroidal core 18, and a second winding 22 on the second toroidal core 18. The windings 20 and 22 are wound on the second toroidal core 18 in the same manner as the two windings 14 and 16 on the first toroidal core 12. However, to achieve the function of the differential mode choke DMC, the output of the first winding 14 on the first toroidal core 12 (i.e., the connection point located at the top right in FIG. 1) is connected to the connection point located at the top right of the differential mode choke DMC in FIG. 1. In contrast, the lower right output of the common mode choke CMC is connected to the lower left connection terminal of the differential mode choke DMC.

[0059] In other words, the signal passing through the common mode choke CMC is guided in the opposite direction through the first winding 20 on the second toroidal core 18, whereas the signal coming from the common mode choke CMC is guided in the same direction as in the common mode choke CMC through the second winding 22 of the differential mode choke DMC. As a result, the magnetic fluxes of the differential mode signals guided through the first winding 20 and the second winding 22 on the second toroidal core 18 are added on the second toroidal core 18. This attenuates the differential mode noise on the two conductors in the differential mode choke DMC.

[0060] Differential mode noise refers to a signal that has a potential difference between the two conductors 1 and 2. This also applies to the useful signal on the two conductors 1 and 2. Therefore, the differential mode choke DMC must be dimensioned so that it primarily attenuates differential mode noise and not the useful signal. This is possible by appropriately determining the inductance of the two windings 20 and 22 on the second toroidal core 18, since differential mode noise typically has a different frequency than the useful signal. By making the second toroidal core 18 out of iron, and in particular iron powder, the material of the second toroidal core 18 only saturates when the magnetic flux is large. This avoids saturation of the second toroidal core 18 during normal operation, and the inductance is sufficiently large to attenuate differential mode noise.

[0061] The component 10 according to the invention has two conductors 3, 4 on which substantially only useful signals are present, since the common mode noise in the common mode choke CMC and the differential mode noise in the differential mode choke DMC are attenuated.

[0062] The two windings 20, 22 on the second toroidal core 18 have the same number of turns and are made of the same wire with the same thickness and the same ohmic resistance. In the component 10 according to the present invention, the windings 14, 16 on the first toroidal core 12 and the windings 20, 22 on the second toroidal core 18 are made of the same wound wire with the same diameter and the same ohmic resistance, and all have the same number of turns.

[0063] As will be explained further below, the windings 14, 16 on the first toroidal core 12 and the windings 20, 22 on the second toroidal core 18 are arranged spatially separated from one another on the first toroidal core 12 or the second toroidal core 18. This makes the component 10 according to the invention highly suitable for network applications with a voltage of, for example, 250 V. This is achieved by the fact that the first winding 14 is wound in a different angular region from the second winding 16 on the first toroidal core 12. The first winding 20 on the second toroidal core 18 is wound in a different angular region from the second winding 22 on the second toroidal core 18. The different angular regions do not overlap.

[0064] To ensure spatial and electrical isolation of the windings 14, 16 on the first toroidal core 12 or the windings 20, 22 on the second toroidal core 18, retention and isolation members are used, as will be further described below.

[0065] The component 10 of the present invention provides a passive electrotechnical component that attenuates both common mode and differential mode noise.

[0066] FIG. 2 shows a passive component 10 according to the present invention as viewed obliquely from above.

[0067] The passive component 10 according to the present invention comprises a common mode choke CMC and a differential mode choke DMC. The common mode choke CMC and the differential mode choke DMC are arranged side by side on a base 24. The base 24 is formed in the shape of a rectangular parallelepiped in the form of a thick plate. The base 24 has a number of notches 26 on its side edges, through which the respective winding wires are guided to the underside of the base 24. A number of contact pins 28 are arranged on the underside of the base 24, which are covered in FIG. 2, and which are also connected to the respective winding wires (see also FIG. 7).

[0068] The common mode choke CMC has a first toroidal core 12, which in the illustrated embodiment is made of ferrite. In the illustrated embodiment variant, the first toroidal core 12 is made of manganese-zinc-ferrite. A first winding 14 and a second winding 16 are wound on the first toroidal core 12. The first winding 14 and the second winding 16 are separated from each other by being wound on different angular regions of the first toroidal core 12, where these angular regions do not overlap.

[0069] The differential mode choke DMC has a second annular core 18, which is made of iron, and in the illustrated embodiment is made of iron powder. The second annular core 18 has the same geometric dimensions as the first annular core 12. The two annular cores 12, 18 are arranged on a base 24 with their central axes aligned with each other.

[0070] A first winding 20 and a second winding 22 are wound on the second annular core 18 of the differential mode choke DMC. The first winding 20 and the second winding 22 are wound in different angular regions of the second annular core 18, and these winding regions do not overlap.

[0071] By winding the wires on different angular regions, the first winding 14 and the second winding 16 on the first annular core 12 are spatially separated from each other, and the first winding 20 and the second winding 22 on the second annular core 18 are similarly spatially separated from each other. A retaining and separating member 30 is further provided to prevent the wires of the first winding 14 and the second winding 16 on the first annular core 12 from contacting each other with the wires of the first winding 20 and the second winding 22 on the second annular core 18. The retaining and separating member 30 extends into both the internal space of the first annular core 12 and the internal space of the second annular core 18 and is in contact with the inner circumference of the first annular core 12 at two opposing contact locations and the inner circumference of the second annular core 18 at two opposing contact locations. Even if the component 10 according to the invention is used, for example, in a vehicle and is subjected to high accelerations or vibrations, the windings 14, 16, 20, 22 will not slide on their respective toroidal cores 12, 18 a distance that would cause the wires of different windings to come into contact with each other, thereby making the passive component 10 suitable for network applications having voltages of, for example, 250 V or more.

[0072] The retention and separation member 30 holds the two annular cores 12, 18 in position relative to each other and relative to the base 24, as will be further explained below.

[0073] Figure 3 shows a cross section of the component 10 according to the invention. Since the cutting plane in Figure 2 extends between the first annular core 12 and the second annular core 18, when looking at this cutting plane shown in Figure 3, only the first annular core 12 with the first winding 14 and the second winding 16 is visible. The retention and separation member 30 is shown cut away. A retention section 32 of the retention and separation member 30 is positioned within a blind hole in the base 24. The retention section 32 fits within a blind hole 34 in the base.

[0074] In FIG. 3, two contact pins 28 can be seen on the underside of the base 24, which are connected to the wound wire.

[0075] Figure 4 shows another cross section of component 10 according to the present invention, with the cutting plane shown in Figure 4 including the central axes of first annular core 12 and second annular core 18. Thus, in this cross section of Figure 4, first annular core 12, second annular core 18 and base 24 are visible, and retaining and separating member 30 is cut in the middle parallel to its sides.

[0076] The holding section 32 of the holding and separating element 30, which is clamped in the blind hole 34 of the base 24, has already been described. The holding section 32 is fork-shaped for clamping and has two notches, which allow the two sections of the holding section 32, located to the left or right in FIG. 4, to be elastically deformed slightly inward, thereby achieving a clamping effect in the recess 34. Of course, within the scope of the present invention, the holding section 32 can also be glued in the recess 34 or welded to the wall of the recess 34 in a suitable manner. The holding and separating element 30 can be formed as a plastic injection-molded part.

[0077] 4 further shows that the holding and separating member has a T-shaped splicing section 36. The first annular core 12 or the second annular core 18 is spliced to both end faces of the cross bar of the splicing section 36. Thus, the splicing section 36 holds the two annular cores 12, 18 at a predetermined distance from each other.

[0078] A first separation section 38 of the retention and separation member 30 extends into the interior space of the first annular core 12. A second separation section 40 of the retention and separation member 30 extends into the interior space of the second annular core 18. Each of the separation sections 38, 40 is elastically deformable, such that, in the view of FIG. 4, separation section 38 is slightly compressed from top to bottom, and separation section 40 is similarly slightly compressed in the top to bottom direction.

[0079] 4, it can be seen that the upper locking arm 42 presses against the inner periphery of the first annular core 12 in the region of the separation section 38, and that the lower locking arm 44 also presses against the inner periphery of the annular core 12. The locking arm 42 has a locking protrusion 46 that extends upward in FIG. 4 and away from the base. The lower locking arm 44 in FIG. 4 has a locking protrusion 48 that extends toward the base 24, i.e., downward in FIG. 4. When the separation section 38 is inserted into the inner periphery of the first annular core 12, the two locking arms 42, 44 first move slightly toward each other until the locking protrusions 46, 48 press against the inner periphery of the first annular core 12 at their opposing contact points. In this case, the separating section 38 is inserted into the internal space of the first annular core 12 parallel to its central axis, after which the locking projections 46, 48 again leave the internal space of the first annular core 12 and move radially outward to the position shown in Figure 4. As a result, the locking arms 42, 44 open radially outward, and the annular core 12 is fixed relative to the holding and separating member 30 in the position shown in Figure 4. This is because the annular core 12 cannot move to the left in Figure 4 because this movement is prevented by the locking projections 46, 48. The first annular core 12 also cannot move to the right in Figure 4 because the annular core is prevented from moving in this direction by the splice section 36 of the holding and separating member 30.

[0080] In the same manner, the separating section 40 is moved into the internal space of the second annular core 18, finally achieving the position shown in FIG. 4. The separating section 40 is formed similarly to the separating section 38. In this position, the second annular core 18 is held against the retaining and separating member shown in FIG. 4 by the locking lugs on the locking arms of the separating section 40 preventing it from moving outward, i.e., to the right in FIG. 4, and the splicing section 36 preventing it from moving in a direction toward the first annular core, i.e., to the left in FIG. 4. The two annular cores 12, 18 are supported on the upper side of the base 24 and are prevented from moving away from the upper side of the base by the retaining and separating member 30.

[0081] It can also be seen in FIG. 4 that retention and separation members 30 separate the windings on the toroidal cores 12 or 18 from one another and prevent them from contacting one another if the wound wires of the windings are moved, for example, relative to the toroidal cores 12, 18.

[0082] Figure 5 shows the holding and separating member 30 from the front at an angle. The holding section 32 is shown inserted into the notch 34 in the base 24 (see Figure 4). Also visible is the splice section 36, the crossbar of which is attached to the insides of the two annular cores 12, 18 (see Figure 4). In Figure 5, the left separating section 38 is shown to have two locking arms 42 and 44, where the locking arm 42 has a locking lug 46 pointing away from the holding section 32, and the locking arm 44 has a locking lug 48 pointing towards the holding section 32. The locking lugs 46, 48 prevent the first annular core 12 from moving away from the holding and separating member 30.

[0083] The separation section 40 is opposite to the separation section 38 and is configured symmetrically with respect to the separation section 38, with the plane of symmetry extending through the center of the splice section 36 and the holding section 32.

[0084] Between the splice section 36 and the retaining section 32, an oblong notch 50 can be seen, which notch extends into the separation sections 38 and 40. The notch 50, together with the incisions 52 extending parallel to the notch 50, ensures the elastic deformability of the separation sections 38, 40, so that the locking arms 42, 44 of the separation section 38 and the locking arms of the separation section 40 can move towards each other when inserted into the internal space of the annular core 12, 18, and then move apart again elastically after traversing the internal space (see FIG. 4).

[0085] FIG. 6 shows a top view of the retention and separation member 30 of FIG.

[0086] Figure 7 shows the passive component 10 according to the invention from below. A total of six contact pins 28 can be seen on the underside of the base 24, which can be inserted into suitable through-holes in a printed circuit board, for example. Conductors 1, 2, 3, and 4 can then be connected to these contact pins 28. To realize the circuits of the common-mode choke CMC and differential-mode choke DMC shown diagrammatically in Figure 1, the central contact pin 28 in Figure 7 is connected to the winding wires of two windings, respectively.

Claims

1. 1. A passive electrotechnical component (10) for attenuating common-mode and differential-mode noise on at least two electrical conductors (1, 2, 3, 4) leading to the component (10), the passive electrotechnical component having two toroidal cores (12, 18) with at least two windings (14, 16, 20, 22) arranged on each toroidal core (12, 18), the two windings on the first toroidal core (12) being wound and / or connected to provide high attenuation of common-mode signals on the electrical conductors (1, 2, 3, 4), and the windings (20, 22) on the second toroidal core (18) being wound and / or connected to provide high attenuation of differential-mode noise on the electrical conductors (1, 2, 3, 4).

2. 2. A passive electrotechnical component according to claim 1, characterized in that the first annular core (12) is made from ferrite, in particular from manganese-zinc-ferrite.

3. A passive electrotechnical component, characterized in that the second annular core (18) is made from iron, in particular from iron powder.

4. A passive electrotechnical component according to at least one of claims 1 to 3, characterized in that the two annular cores (12, 18) are arranged on a common base (24).

5. A passive electrotechnical component according to at least one of claims 1 to 4, characterized in that the two annular cores (12, 18) are arranged parallel to each other and with their through holes aligned.

6. 6. A passive electrotechnical component according to at least one of claims 1 to 5, characterized in that the two toroidal cores (12, 18) have identical geometric dimensions, the diameter and material of the winding wire used for all the windings (14, 16, 20, 22) are equal and / or the number of turns of the windings (14, 16, 20, 22) are equal.

7. The rotor includes two annular cores (12, 18) and a base, the annular cores being disposed on the base, and two spatially separated windings (14, 16, 20, 22) being disposed on each annular core (12, 18) such that a first winding (14, 20) is disposed on a first angular region of the annular core (12, 18) and a second winding is disposed on a second angular region of the annular core (12, 18), the first angular region and the second angular region being different from each other and not overlapping, and a retaining and separating member (30) is provided, the retaining and separating member being connected to the base (24) on the one hand and fitting into an internal space of each annular core (12, 18) on the other hand, the retaining and separating member (30) being integrally formed, and the retaining and separating member (30) being divided into two separating sections (38, 40). a first separating section (38) abutting against the inner circumference of the first annular core (12) at at least two spaced apart contact locations, thereby separating the first angular area for the first winding (14) on the first annular core (12) from the second angular area for the second winding (16) on the first annular core (12) from each other on the inner circumference of the first annular core (12); and a second separating section (40) abutting against the inner circumference of the second annular core (18) at at least two spaced apart contact locations, thereby separating the first angular area for the first winding on the second annular core (18) from the second angular area for the second winding (22) on the second annular core (18) from each other on the inner circumference of the second annular core (18).

8. 8. The passive component of claim 7, wherein the two annular cores (12, 18) are arranged parallel to each other, the attachment section of the holding and separating member (30) is arranged between a first side surface of the first annular core (12) and a second side surface of the second annular core (18) facing the first side surface of the first annular core (12), and the first side surface of the first annular core (12) and the second side surface of the second annular core (18) are attached to the attachment section.

9. A passive electrotechnical component according to claim 7 or 8, characterized in that the holding and separating member (30) is formed in the shape of a plate.

10. 10. A passive component according to any one of claims 7 to 9, characterized in that at least the separating section (38, 40) of the holding and separating member (30) is made elastically deformable.

11. 11. The passive component of claim 10, wherein the separation sections (38, 40) each have at least one notch (52) extending from an edge of the retaining and separating member (30) into the separation section (38, 40).

12. 12. A passive component according to at least one of claims 7 to 11, characterized in that the two separated sections (38, 40) are connected to each other and an elongated notch / through hole (50) extends from the first separated section (38) into the second separated section (40) (elastically deformable).

13. 13. A passive component according to claim 11 or 12, characterized in that each separation section (38, 40) has two notches (52) that extend straight from the edge of the separation section (38, 40) into the separation section (38, 40) in the direction of the separation section (38, 40) that is opposite to each other, and in which the elongated notch / through hole (50) is arranged parallel to the two notches (52).

14. 14. A passive component according to claim 7, characterized in that the free ends of the separating sections (38, 40) each have at least one locking lug (46, 48) for gripping the rear side of the respective annular core (12, 18).

15. 15. A passive component according to claim 14, characterized in that the free end of each separation section (38, 40) has two opposing locking lugs (46, 48) for gripping the rear side of the respective annular core (12, 18) at two opposing points.

16. 16. A passive component according to at least one of claims 7 to 15, characterized in that the holding section (32) of the holding and separating member (30) is inserted into a notch in the base.

17. 17. A passive component according to claim 16, characterized in that the holding section (32) is formed elastically deformable.

18. 18. The passive component of claim 17, wherein the retaining section (32) has at least one notch extending from an edge of the retaining and separating member (30) into the retaining section (32).

19. Passive component according to at least one of claims 7 to 18, characterized in that the holding and separating member (30) is formed as a plastic injection-molded part.

20. 20. A passive component according to at least one of the preceding claims, characterized in that the base (24) is provided with a notch (26) starting from the side of the base (24) in order to guide the wound wire to the underside of the base (24).

21. 21. A passive component according to claim 1, characterized in that the base (24) is provided with a contact surface or contact pin (28) on its underside facing away from the annular core (12, 18).

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