Passive electrotechnical component

Abstract

The invention relates to a passive electrotechnical component for attenuating common-mode interference and differential-mode interference on at least two electrical lines leading to the component, comprising two toroidal cores, wherein: on each toroidal core, at least two windings are provided; the two windings on the first toroidal core are wound and / or connected such that high attenuation of common-mode signals on the electrical lines is achieved; and the windings on the second toroidal core are wound and / or connected such that high attenuation of differential-mode interference on the electrical lines is achieved.

Description

[0001] Passive electrical component

[0002] The invention relates to a passive electrotechnical component

[0003] A separator for a toroidal core choke is known from German patent application DE 10 201 206 171 A1. The separator consists of two parts, and the first part can be snapped into the second part.

[0004] A common mode choke is known from the Japanese patent abstract JP 03062506 A.

[0005] Another common mode choke is known from the US publication US 2008 / 0129438 A1.

[0006] The invention aims to improve a passive electrical component.

[0007] According to the invention, a passive electrotechnical component with the features of claim 1 is provided for this purpose. Advantageous developments of the invention are mentioned in the subclaims.

[0008] A passive electrical component according to the invention is provided for attenuating common-mode and differential-mode interference on at least two electrical lines leading to the component and comprises two toroidal cores, with at least two windings arranged on each toroidal core. The two windings on the first toroidal core are wound and / or connected in such a way that high attenuation of common-mode signals on the electrical lines is achieved. The windings on the second toroidal core are wound and / or connected in such a way that high attenuation of differential-mode interference on the electrical lines is achieved.

[0009] Common-mode interference refers to interference that has essentially the same signal level on at least two lines that also carry a wanted signal. As a result, common-mode interference cannot be measured between the two lines. Differential-mode interference is also known. Differential-mode interference has a different voltage level on at least two lines that also carry a wanted signal. As a result, differential-mode interference can be measured between the two lines that also carry the wanted signal. Both common-mode interference and differential-mode interference impair the quality and usability of the wanted signal. The passive electrical component according to the invention enables the simultaneous attenuation of differential-mode and common-mode interference. The electrical component according to the invention combines a common-mode choke with a differential-mode choke.The common-mode choke has a first toroidal core on which two windings are arranged. The differential-mode choke has a second toroidal core, which also has two windings. The windings on the first toroidal core of the common-mode choke are wound and / or connected in such a way that the magnetic fluxes caused by the common-mode interference on the different lines and thus on the different windings add up in the toroidal core, thereby dampening the common-mode interference. The magnetic fluxes generated on the first toroidal core by the wanted signal, on the other hand, cancel each other out, so that practically no attenuation of the wanted signal is caused. In the second toroidal core of the differential-mode choke, the differential-mode interference on the different lines and thus on the different windings generate magnetic fluxes that add up to each other.This dampens the differential-mode noise at the second toroidal core of the differential-mode choke. The material of the second toroidal core is selected so that it saturates late, preventing saturation of the second toroidal core during normal operation. The inductances of the differential-mode choke must be selected so that the desired signal is not excessively attenuated, but only the differential-mode noise. This is possible because the differential-mode noise and the desired signal lie in a different frequency range.

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

[0011] This allows a high common-mode attenuation to be achieved in the common-mode choke.

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

[0013] A toroidal core made of iron or iron powder exhibits high saturation. This prevents the differential-mode choke from saturating during normal operation, ensuring that the inductance is large enough to attenuate the differential-mode interference signal.

[0014] In a further development of the invention, the two toroidal cores are arranged on a common base. This enables a very compact arrangement.

[0015] In a further development of the invention, the two toroidal cores are arranged parallel to each other and so that their through openings are aligned.

[0016] This also results in a very compact and space-saving arrangement.

[0017] In a further 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 the same and / or the number of turns of all windings is the same.

[0018] In this way, the passive electrotechnical component according to the invention can be manufactured cost-effectively in large quantities in an automated manner.

[0019] In a further development of the invention, the passive electrical component has two toroidal cores and a base on which the toroidal cores are arranged, wherein two spatially separated windings are arranged on each toroidal core, so that on each toroidal core a first winding is arranged on a first angular range of the toroidal core and a second winding is arranged on a second angular range of the toroidal core, wherein the first and the second angular range are different from each other and do not overlap, wherein a holding and separating element is provided which is connected on the one hand to the base and on the other hand engages in the interior of each toroidal core, wherein the holding and separating element is formed in one piece, wherein the holding and separating element has two separating sections,wherein a first separating section bears against at least two spaced-apart contact points on the inner circumference of the first toroidal core and thereby separates the first angular range for the first winding on the first toroidal core and the second angular range for the second winding on the first toroidal core on the inner circumference of the first toroidal core, and wherein a second separating section bears against at least two spaced-apart contact points on the inner circumference of the second toroidal core and thereby separates the first angular range for the first winding on the second toroidal core and the second angular range for the second winding on the second toroidal core on the inner circumference of the second toroidal core.

[0020] By means of a single holding and separating element, the two toroidal cores can be held in position on the base and the two windings on the first toroidal core can be separated from one another. Furthermore, the two windings on the second toroidal core can also be separated from one another using the holding and separating element. The passive electrical component according to the invention is therefore also suitable for mains applications with a voltage of, for example, 250 V. This is because the separation of the two windings on the first toroidal core and the separation of the two windings on the second toroidal core reliably prevents a short circuit between the two windings on the first toroidal core and the two windings on the second toroidal core. This also applies when the component is exposed to strong acceleration or vibrations.

[0021] In a further development of the invention, the two toroidal cores are arranged parallel to one another, wherein a contact section of the holding and separating element is arranged between a first side surface of the first toroidal core and a second side surface of the second toroidal core, which faces the first side surface of the first toroidal core, and wherein the first side surface of the first toroidal core and the second side surface of the second toroidal core bear against the contact section.

[0022] By means of the holding and separating element, the two toroidal cores can be held at a precisely defined distance from each other, since both the first toroidal core and the second toroidal core rest on the contact section of the holding and separating element.

[0023] In a further development of the invention, the holding and separating element is plate-shaped.

[0024] In this way, the holding and separating element can be manufactured cost-effectively and the elastic properties of the holding and separating element can be determined by simple incisions or recesses in the holding and separating element.

[0025] In a further development of the invention, at least the separating sections of the holding and separating element are designed to be elastically deformable.

[0026] In this way, the separators can be pressed together and inserted into the toroidal cores, for example. Once released, the separators spring back into place, thereby securely contacting a first contact point and a second contact point on the inner circumference of the toroidal core. For example, the separators can be clipped into the interior of the toroidal core.

[0027] In a further development of the invention, the separating sections are each provided with at least one incision which extends from an edge of the holding and separating element into the separating section. 1 In this way, the elasticity of the cutting section can be adjusted depending on the length of the incision.

[0028] In a further development of the invention, the two separating sections are connected to one another and an elongated recess / through opening extends from the first separating section into the second separating section.

[0029] The elastic deformability of the two separating sections can also be adjusted in this way.

[0030] In a further development of the invention, each separating section is provided with two incisions which extend from one edge of the separating section in a straight line in the direction of the opposite separating section into the separating section and the elongated recess / through opening is arranged parallel to the two incisions.

[0031] In this way, two spring-loaded locking arms are formed at each separating section, which then initially compress when inserted into the interior of a toroidal core and can then spring back up again once the intended end position has been reached.

[0032] In a further development of the invention, a free end of the separating sections is provided with at least one locking lug in order to engage behind a side surface of the respective toroidal core.

[0033] In this way, the holding and separating element can be snapped into the inner circumference of a toroidal core.

[0034] In a further development of the invention, the free end of each separating section is provided with two opposing locking lugs in order to engage behind the side surface of the respective toroidal core at two opposite points.

[0035] In this way, each separating section can be simply compressed for insertion into a toroidal core until the distance between the two opposing locking lugs is slightly smaller than the inner diameter of the toroidal core. After insertion and when the locking lugs have completely traversed the interior of the toroidal core, the locking lugs can spring back radially outward, thereby securely fixing the separating section in the toroidal core. In a further development of the invention, the holding and separating element is inserted with a foot section into a recess in the base.

[0036] This allows the holding and separating element to be fixed to the base very easily.

[0037] In a further development of the invention, the holding section is designed to be elastically deformable.

[0038] The holding and separating element can thus be attached to the base very easily and reversibly. For example, the two toroidal cores are snapped onto the separating sections of the holding and separating element in the fully wound state, and then the holding and separating element is attached to the base with its foot section. This can be done tool-free and, if necessary, fully automated.

[0039] In a further development of the invention, the holding section is provided with at least one incision which extends from an edge of the holding and separating element into the holding section.

[0040] In this way, elastic deformability of the holding section can be ensured, particularly in the case of a plate-shaped holding and separating element.

[0041] In a further development of the invention, the holding and separating element is designed as a plastic injection-molded part.

[0042] This makes cost-effective, large-scale production easily possible. The plastic used should have the desired electrically insulating properties.

[0043] In a further development of the invention, the base is provided with cuts extending from side surfaces of the base in order to guide winding wires to an underside of the base.

[0044] In this way, the winding wires do not have to protrude beyond the outline of the base. This facilitates handling of the passive component according to the invention and, in particular, the winding wires are arranged in a protected manner.

[0045] In a further development of the invention, an underside of the base facing away from the toroidal cores is provided with contact surfaces or contact pins. For example, an underside of the base is provided with contact surfaces and designed as an SMD component. The winding wires are then routed to the contact surfaces and electrically connected to them. Alternatively, contact pins can also be provided on the underside of the base, which are then also electrically connected to the winding wires.

[0046] Further features and advantages of the invention will become apparent from the claims and the following description of a preferred embodiment of the invention in conjunction with the drawings. In the drawings:

[0047] Fig. 1 shows the schematic electrical structure of the passive component according to the invention,

[0048] Fig. 2 is a view of the passive component according to the invention from above,

[0049] Fig. 3 is a first sectional view of the component of Fig. 2,

[0050] Fig. 4 is a second sectional view of the component of Fig. 2,

[0051] Fig. 5 is a front view of the holding and separating element of the passive component according to the invention of Fig. 2,

[0052] Fig. 6 is a front view of the holding and separating element of Fig. 5 and

[0053] Fig. 7 is a view of the passive electrical component of Fig. 2 from below.

[0054] Fig. 1 shows the schematic electrical structure of the passive component according to the invention. The component according to the invention comprises a common-mode choke (CMC) and a differential-mode choke (DMC). The common-mode choke (CMC) is provided for attenuating common-mode signals on the electrical lines 1, 2 leading to the passive component 10 according to the invention. The two lines can then be routed further at the terminals 3, 4.

[0055] Common-mode interference on the two lines 1, 2 refers to signals that have essentially the same voltage on both lines 1, 2. Common-mode interference arises, for example, because the two lines 1, 2 each act as an antenna. Common-mode interference on the lines 1, 2 cannot be detected by a measurement between the two lines 1, 2, since they have essentially the same voltage or potential on both lines 1, 2.

[0056] The common-mode choke CMC has a schematically illustrated toroidal core 12 and a first winding 14 and a second winding 16 on the first toroidal core 12. The two windings 14, 16 are wound on the toroidal core 12 in such a way that the magnetic flux caused by the common-mode interference on line 1 in the first toroidal core 12 and the magnetic flux caused by the common-mode interference on line 2 in the first toroidal core 12 add up. As a result, the electrical energy of the common-mode interference is converted into magnetic energy and then attenuated in the first toroidal core 12. The first toroidal core 12 is made of ferrite. Manganese-zinc ferrite has proven advantageous within the scope of the invention.

[0057] The two windings 14, 16 on the first toroidal core 12 have the same number of turns and are also made of the same wire with the same thickness and the same ohmic resistance. The two windings 14, 16 are wound on the toroidal core 12 with the same winding direction, so that for common-mode signals, the magnetic fluxes generated by the two windings 14, 16 in the toroidal core 12 add up.

[0058] Alternatively, the two windings 14, 16 on the first toroidal core 12 can also have a different winding sense. In this case, however, the common-mode choke CMC must be connected differently to the two lines 1, 2 in order to ensure that the magnetic flux generated by the common-mode interference on the two lines 1, 2 is added together in the first toroidal core 12. This could be achieved, for example, by connecting line 1 not to the upper left terminal of the common-mode choke CMC in Fig. 1, but to the upper right terminal of the common-mode choke CMC in Fig. 1.

[0059] If a useful signal is transported on the two lines 1, 2, this useful signal has a potential difference between the two lines 1, 2. The useful signal can therefore be measured between the two lines 1, 2. If a useful signal now arrives at the common-mode choke CMC via the two lines 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. The component 10 according to the invention further has a differential mode choke DMC (differential mode choke). The differential mode choke DMC has 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, 22 are wound on the second toroidal core 18 in the same way as the two windings 14, 16 on the first toroidal core 12.To achieve the effect of a differential-mode choke (DMC), the output of the first winding 14 on the first toroidal core 12—the top right connection point in Fig. 1—is connected to the connection point located on the top right side of the differential-mode choke (DMC) in Fig. 1. The bottom right output of the common-mode choke (CMC), on the other hand, is connected to the bottom left connection of the differential-mode choke (DMC).

[0060] In other words, the signal passing through the common-mode choke CMC is passed in the opposite direction through the first winding 20 on the second toroidal core 18, while the signal coming from the common-mode choke CMC is passed through the second winding 22 of the differential-mode choke DMC in the same direction as in the common-mode choke CMC. This results in the magnetic fluxes of a differential-mode signal passing through the first winding 20 and the second winding 22 on the second toroidal core 18 being added on the second toroidal core 18. This dampens differential-mode interference on both lines in the differential-mode choke DMC.

[0061] Normal mode interference is a signal that has a potential difference between the two lines 1, 2. Since this is also the case with the useful signal on the two lines 1, 2, the normal mode choke DMC must be dimensioned such that it is mainly the normal mode interference that is attenuated and not the useful signal. This is possible by appropriately setting the inductances of the two windings 20, 22 on the second toroidal core 18, since normal mode interference usually has a different frequency than the useful signal. Because the second toroidal core 18 is made of iron, specifically iron powder, the material of the second toroidal core 18 only saturates when there are large magnetic fluxes. This prevents saturation of the second toroidal core 18 during normal operation, so that the inductance is large enough to attenuate the normal mode interference.

[0062] The two lines 3, 4 lead away from the component 10 according to the invention. Essentially only the useful signal is present on the two lines 3, 4, since common-mode interference is attenuated in the common-mode choke CMC and differential-mode interference is attenuated in the differential-mode choke DMC. The two windings 20, 22 on the second toroidal core 18 have the same number of turns and consist of the same wire with the same thickness and the same ohmic resistance. In the component 10 according to the invention, the windings 14, 16 on the first toroidal core 12 and the windings 20, 22 on the second toroidal core 18 consist of the same winding wire with the same diameter and the same ohmic resistance and all have the same number of turns.

[0063] As will be explained 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 and the second toroidal core 18, respectively. As a result, the component 10 according to the invention is also well suited for mains applications with voltages of, for example, 250 V. This is achieved by the first winding 14 being wound on a different angular range of the first toroidal core 12 than the second winding 16. The first winding 20 on the second toroidal core 18 is wound on a different angular range of the second toroidal core 18 than the second winding 22. The different angular ranges do not overlap.

[0064] In order to ensure the spatial and electrical separation of the windings 14, 16 on the first toroidal core 12 and the windings 20, 22 on the second toroidal core 18, a holding and separating element is used, which will be explained below.

[0065] The component 10 according to the invention provides a passive electrotechnical component with which both common-mode interference and differential-mode interference can be attenuated.

[0066] Fig. 2 shows a view of the passive component 10 according to the invention in a view obliquely from above.

[0067] The passive component 10 according to the invention comprises the common-mode choke CMC and the 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 cuboid-shaped in the form of a thick plate. The base 24 is provided with a plurality of notches 26 on its side edges, through each of which a winding wire is guided to the underside of the base 24. On the underside of the base 24, which is hidden in Fig. 2, a plurality of contact pins 28 are arranged, which in turn are each connected to a winding wire (see also Fig. 7). The common-mode choke CMC comprises the first toroidal core 12, which in the illustrated embodiment is made of ferrite. In the illustrated embodiment, the first toroidal core 12 is made of manganese-zinc ferrite. The first winding 14 and the second winding 16 are wound onto the first toroidal core 12.The first winding 14 and the second winding 16 are separated from each other in that they are wound on different angular regions of the first toroidal core 12, whereby these angular regions do not overlap.

[0068] The push-pull choke DMC has the second toroidal core 18, which is made of iron, in the illustrated embodiment of iron powder. The second toroidal core 18 has the same geometric dimensions as the first toroidal core 12. The two toroidal cores 12, 18 are arranged on the base 24 such that their central axes are aligned with each other.

[0069] The first winding 20 and the second winding 22 are wound on the second toroidal core 18 of the push-pull choke DMC. The first winding 20 and the second winding 22 are wound on different angular regions of the second toroidal core 18, whereby these angular regions do not overlap.

[0070] By winding at different angular ranges, the first winding 14 and the second winding 16 on the first toroidal core 12 are spatially separated from one another, and the first winding 20 and the second winding 22 on the second toroidal core 18 are likewise spatially separated from one another. In order to prevent the wires of the first winding 14 and the second winding 16 on the first toroidal core 12 and the wires of the first winding 20 and the second winding 22 on the second toroidal core 18 from coming into contact with one another, a holding and separating element 30 is additionally provided. The holding and separating element 30 extends both into the interior of the first toroidal core 12 and into the interior of the second toroidal core 18 and rests against two opposing contact points on the inner circumference of the first toroidal core 12 and against two opposing contact points on the inner circumference of the second toroidal core 18.Even when the component 10 according to the invention is exposed to high accelerations or vibrations, for example, when used in a vehicle, the windings 14, 16, 20, 22 cannot slip so far on the respective toroidal core 12, 18 that wires from different windings come into contact with each other. The passive component 10 is therefore also suitable for mains applications with voltages of, for example, 250 V or more.

[0071] The holding and separating element 30 also holds the two toroidal cores 12, 18 in position relative to one another and also in position relative to the base 24. This will be explained in more detail below. Fig. 3 shows a sectional view of the component 10 according to the invention. The sectional plane in Fig. 2 runs between the first toroidal core 12 and the second toroidal core 18, so that when looking at this sectional plane according to Fig. 3, only the first toroidal core 12 with the first winding 14 and the second winding 16 can be seen. The holding and separating element 30 is shown in section. A holding section 32 of the holding and separating element 30 is arranged in a blind hole in the base 24. The holding section 32 is clamped into the blind hole 34 in the base.

[0072] In the view of Fig. 3, two contact pins 28 can be seen on the underside of the base 24, which are connected to winding wires.

[0073] Fig. 4 shows a further sectional view of the component 10 according to the invention, wherein the sectional plane in the view of Fig. 4 contains the center axis of the first toroidal core 12 and the second toroidal core 18. Thus, the first toroidal core 12, the second toroidal core 18, and the base 24 can be seen in the sectional view of Fig. 4, and the holding and separating element 30 is cut through in the center parallel to its side surfaces.

[0074] The holding section 32 of the holding and separating element 30, which is clamped into the blind hole 34 of the base 24, has already been explained. For this purpose, the holding section 32 is fork-shaped and has two notches. The two sections of the holding section 32 arranged on the left and right in Fig. 4 can thus be elastically deformed slightly inward. This achieves the clamping effect in the recess 34. Within the scope of the invention, the holding section 32 can of course also be glued into the recess 34 or welded to the wall of the recess 34 in a suitable manner. The holding and separating element 30 can be designed as a plastic injection-molded part.

[0075] Fig. 4 further shows that the holding and separating element has a T-shaped contact section 36. The first toroidal core 12 and the second toroidal core 18 rest against the two end faces of the crossbar of the contact section 36. The contact section 36 thus holds the two toroidal cores 12, 18 at a defined distance from each other.

[0076] A first separating section 38 of the holding and separating element extends into the interior of the first toroidal core 12. A second separating section 40 of the holding and separating element 30 extends into the interior of the second toroidal core 18. Each of the separating sections 38, 40 is elastically deformable such that, in the illustration in Fig. 4, the separating section 38 can be compressed slightly from top to bottom, and the separating section 40 can also be compressed slightly from top to bottom.

[0077] It can be seen in Fig. 4 that in the area of ​​the separating section 38, an upper locking arm 42 rests on the inner circumference of the first toroidal core 12 and a lower locking arm 44 also rests on the inner circumference of the toroidal core 12. The locking arm 42 has a locking lug 46 extending upwards in Fig. 4, away from the base. The locking arm 44, which is located at the bottom in Fig. 4, has a locking lug 48 extending in the direction of the base 24, i.e. downwards in Fig. 4. If the separating section 38 is pushed into the inner circumference of the first toroidal core 12, the two locking arms 42, 44 are first moved slightly towards one another until the locking lugs 46, 48 rest on opposite contact points on the inner circumference of the first toroidal core 12. The separating section 38 is then pushed parallel to the central axis of the first toroidal core 12 into its interior until the locking lugs 46, 48 leave the interior of the first toroidal core 12 again and move radially outwards into the position shown in Fig.4. The locking arms 42, 44 consequently snap radially outward, and the toroidal core 12 is then fixed in the position shown in Fig. 4 relative to the holding and separating element 30. This is because the toroidal core 12 cannot move to the left in Fig. 4, since this movement is prevented by the locking lugs 46, 48. The first toroidal core 12 cannot move to the right in Fig. 4 either, since it is prevented from moving in this direction by the contact section 36 of the holding and separating element 30.

[0078] In the same way, the separating section 40 is moved into the interior of the second toroidal core 18 until the position shown in Fig. 4 is reached. The separating section 40 is designed in the same way as the separating section 38. The second toroidal core 18 is held in its position relative to the holding and separating element of Fig. 4 in that the locking lugs on the locking arms of the separating section 40 prevent outward movement, i.e. to the right in Fig. 4, and the contact section 36 prevents movement of the toroidal core 18 towards the first toroidal core, i.e. to the left in Fig. 4. Both toroidal cores 12, 18 rest on the upper side of the base 24 and are prevented from moving away from the surface of the base by the holding and separating element 30.

[0079] Fig. 4 also shows that the holding and separating element 30 separates the windings on the toroidal cores 12 and 18 from each other and prevents the winding wires of the windings from touching each other, for example, when they shift relative to the toroidal cores 12, 18. Fig. 5 shows the holding and separating element 30 in an oblique front view. The holding section 32 can be seen, which is inserted into the recess 34 of the base 24, see Fig. 4. The contact section 36 can also be seen, on whose crossbars the inner sides of the two toroidal cores 12, 18 rest, see Fig. 4. The two locking arms 42 and 44 can be seen on the separating section 38 on the left in Fig. 5, wherein the locking arm 42 has the locking lug 46 directed away from the holding section 32 and the locking arm 44 has the locking lug 48 facing the holding section 32. The locking lugs 46, 48 prevent the first toroidal core 12 from moving away from the holding and separating element 30.

[0080] The separating section 40 is located opposite the separating section 38 and is constructed symmetrically to the separating section 38, wherein the plane of symmetry runs centrally through the contact section 36 and the holding section 32.

[0081] Between the contact section 36 and the holding section 32, an oval recess 50 can be seen, which extends into the separating section 38 and the separating section 40. Together with the notches 52, which run parallel to the recess 50, the recess 50 ensures elastic deformability of the separating sections 38, 40, so that the locking arms 42, 44 of the separating section 38 and the locking arms of the separating section 40 can be moved toward each other upon insertion into the interior of the toroidal cores 12, 18 and can then spring back open after passing through the interior, see Fig. 4.

[0082] Fig. 6 shows a plan view of the holding and separating element 30 of Fig. 5.

[0083] Fig. 7 shows the passive component 10 according to the invention in an oblique view from below. On the underside of the base 24, a total of six contact pins 28 can be seen, which can be inserted, for example, into suitable through-holes in a printed circuit board. The lines 1, 2, 3, and 4 (see Fig. 1) can then be connected to the contact pins 28. The winding wires of two windings each are connected to the middle contact pins 28 in Fig. 7 in order to implement the interconnection of the common-mode choke CMC and the differential-mode choke DMC shown schematically in Fig. 1.

Claims

Patent claims Passive electrotechnical component (10) for attenuating common-mode and differential-mode interference on at least two electrical lines (1, 2, 3, 4) leading to the component (10), having two toroidal cores (12, 18), wherein at least two windings (14, 16, 20, 22) are arranged on each toroidal core (12, 18), wherein the two windings on the first toroidal core (12) are wound and / or connected in such a way that a high attenuation of common-mode signals on the electrical lines (1, 2, 3, 4) is achieved, and wherein the windings (20, 22) on the second toroidal core (18) are wound and / or connected in such a way that a high attenuation of differential-mode interference on the electrical lines (1, 2, 3, 4) is achieved. Passive electrotechnical component according to claim 1, characterized in that the first toroidal core (12) is formed from ferrite, in particular from manganese-zinc ferrite.A passive electrical component, characterized in that the second toroidal core (18) is made of iron, in particular of iron powder. A passive electrical component according to at least one of the preceding claims, characterized in that the two toroidal cores (12, 18) are arranged on a common base (24). A passive electrical component according to at least one of the preceding claims, characterized in that the two toroidal cores (12, 18) are arranged parallel to one another and such that their through-openings are aligned. A passive electrical component according to at least one of the preceding claims, characterized in that the two toroidal cores (12, 18) have the same geometric dimensions, that the diameter and material of the winding wire used for all windings (14, 16, 20, 22) are the same, and / or that the number of turns of all windings (14, 16, 20, 22) is the same.Passive electrotechnical component according to at least one of the preceding claims, with two toroidal cores (12, 18) and a base on which the toroidal cores are arranged, wherein two spatially separated windings (14, 16, 20, 22) are arranged on each toroidal core (12, 18), so that on each toroidal core (12, 18) a first winding (14, 20) is arranged on a first angular range of the toroidal core (12, 18) and a second winding is arranged on a second angular range of the toroidal core (12, 18), wherein the first and the second angular range are different from one another and do not overlap, wherein a holding and separating element (30) is provided which is connected on the one hand to the base (24) and on the other hand engages in the interior of each toroidal core (12, 18), wherein the holding and separating element (30) is formed in one piece, wherein the holding and separating element (30) has two separating sections (38, 40),wherein a first separating section (38) bears against at least two spaced-apart contact points on the inner circumference of the first toroidal core and thereby separates the first angular range for the first winding (14) on the first toroidal core (12) and the second angular range for the second winding (16) on the first toroidal core (12) on the inner circumference of the first toroidal core (12), and wherein a second separating section (40) bears against at least two spaced-apart contact points on the inner circumference of the second toroidal core (18) and thereby separates the first angular range for the first winding on the second toroidal core (18) and the second angular range for the second winding (22) on the second toroidal core (18) on the inner circumference of the second toroidal core (18). Passive component according to claim 7, characterized in that the two toroidal cores (12, 18) are arranged parallel to one another,wherein a contact section of the holding and separating element (30) is arranged between a first side surface of the first toroidal core (12) and a second side surface of the second toroidal core (18), which faces the first side surface of the first toroidal core (12), and wherein the first side surface of the first toroidal core (12) and the second side surface of the second toroidal core (18) bear against the contact section. Passive component according to claim 7 or 8, characterized in that the holding and separating element (30) is plate-shaped. Passive component according to one of the preceding claims 7 to 9, characterized in that at least the separating sections (38, 40) of the holding and separating element (30) are elastically deformable. Passive component according to claim 10, characterized in that the separating sections (38, 40) are each provided with at least one notch (52).which extends from an edge of the holding and separating element (30) into the separating section (38, 40). Passive component according to at least one of the preceding claims 7 to 11, characterized in that the two separating sections (38, 40) are connected to one another and in that an elongated recess / through-opening (50) extends from the first separating section (38) into the second separating section (40), (elastically deformable). Passive component according to claims 11 and 12, characterized in that each separating section (38, 40) is provided with two incisions (52) which extend from an edge of the separating section (38, 40) in a straight line in the direction of the opposite separating section (38, 40) into the separating section (38, 40), and in that the elongated recess / through-opening (50) is arranged parallel to the two incisions (52).Passive component according to at least one of the preceding claims 7 to 13, characterized in that a free end of the separating sections (38, 40) is each provided with at least one locking lug (46, 48) in order to engage behind a side surface of the respective toroidal core (12, 18). Passive component according to claim 14, characterized in that the free end of each separating section (38, 40) is provided with two opposing locking lugs (46, 48) in order to engage behind the side surface of the respective toroidal core (12, 18) at two opposite points. Passive component according to at least one of the preceding claims 7 to 15, characterized in that the holding and separating element (30) is inserted into a recess in the base with a holding section (32). Passive component according to claim 16, characterized in that the. Holding section (32) is designed to be elastically deformable. Passive component according to claim 17, characterized in that the Holding section (32) is provided with at least one incision which extends from an edge of the holding and separating element (30) into the holding section (32). Passive component according to at least one of the preceding claims 7 to 18, characterized in that the holding and separating element (30) is designed as a plastic injection-molded part. Passive component according to at least one of the preceding claims, characterized in that the base (24) is provided with incisions (26) extending from side surfaces of the base (24) in order to guide winding wires to an underside of the base (24). Passive component according to at least one of the preceding claims, characterized in that an underside of the base (24) facing away from the toroidal cores (12, 18) is provided with contact surfaces or contact pins (28).

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