Means for filtering at least one signal

Abstract

A device (20) for filtering at least one signal comprises a first magnetic core (60) and at least one first coil (31), the first coil (31) having a first coil terminal (43), a second coil terminal (44), a first sub-coil (41), a second sub-coil (42) and a connecting section (45), the first coil terminal (43) being electrically connected to the second coil terminal (44) via the first sub-coil (41), the connecting section (45) and the second sub-coil (42), the first sub-coil (41) having a first coil axis (47) and the second sub-coil (42) having a second coil axis (48), the first coil axis (47) and the second coil axis (48) being arranged parallel to and spaced apart from each other, and the first magnetic core (60) extending through the first sub-coil (41) and extending through the second sub-coil (42).

Description

Technical Field

[0001] The invention relates to a device for filtering at least one signal. Background Art

[0002] JP 2012-59967 A, JP 2000-200723 A, and JP 2000-195725 A disclose a device having a double coil.

[0003] US 2017 / 0309395 A1, US 2012 / 0223797 A1, DE 198 29 424 A1 and JP 2007-305833 A disclose components with coils.

[0004] In the classic arrangement of at least three filter coils on a perfectly circular ring core, at least some of the filter coil inputs are always located near the outputs of adjacent filter coils, which can lead to undesired radiation coupling. Summary of the invention

[0005] Therefore, the object of the present invention is to provide a novel device for filtering at least one signal.

[0006] This object is achieved by the subject matter of claim 1 .

[0007] A device for filtering at least one signal has a first magnetic core and at least one first coil, the first coil having a first coil terminal, a second coil terminal, a first sub-coil, a second sub-coil and a connecting section, the first coil terminal is electrically connected to the second coil terminal through the first sub-coil, the connecting section and the second sub-coil, the first sub-coil has a first coil axis and the second sub-coil has a second coil axis, the first coil axis and the second coil axis are arranged to be parallel to and spaced apart from each other, and the first magnetic core extends through the first sub-coil and the second sub-coil.

[0008] By such a design of the first coil, the input side and the output side can be spatially separated from each other, and undesirable influences due to radiation coupling between the first coil terminal and the second coil terminal can be reduced.

[0009] According to a preferred embodiment, the first sub-coil and the second sub-coil are wound in opposite directions so that when a predetermined current passes through the first coil, induction is caused in the first direction in the axis of the first coil and induction is caused in the second direction in the axis of the second coil, the second direction being opposite to the first direction. By winding in opposite directions, the magnetic flux transmitted through the magnetic core can enhance the output signal. In the case of the same direction, attenuation may occur due to the magnetic flux.

[0010] According to a preferred embodiment, the first coil axis and the second coil axis define a first plane. The first plane is defined by two parallel coil axes and is helpful for other definitions.

[0011] According to a preferred embodiment, the first coil terminal and the second coil terminal are arranged on a first side of a first plane and point away from the first plane. The arrangement on the same side of the first plane enables the coil terminals to be connected to a common carrier (for example, a printed circuit board). By pointing the coil terminals away from the first plane, they can be easily connected to the carrier on the first side.

[0012] According to a preferred embodiment, the first coil terminal and the second coil terminal are oriented perpendicularly away from the first plane. As a result, the coil can be fixed to the carrier in a lying position.

[0013] According to a preferred embodiment, the second plane is defined in such a way that the second plane is perpendicular to the first plane and the first coil axis is contained in the second plane, and the third plane is defined in such a way that the third plane is perpendicular to the first plane and the second coil axis is contained in the third plane, the first coil terminal is arranged on the side of the second plane facing away from the second coil axis, and the second coil terminal is arranged on the side of the third plane facing away from the first coil axis. This arrangement arranges the first coil terminal and the second coil terminal relatively far from each other, and reduces the risk of radiation coupling.

[0014] According to a preferred embodiment, the second plane is defined in such a way that the second plane is perpendicular to the first plane and the first coil axis is contained in the second plane, and the third plane is defined in such a way that the third plane is perpendicular to the first plane and the second coil axis is contained in the third plane, the first coil terminal is arranged on the side of the second plane facing the second coil axis, and the second coil terminal is arranged on the side of the third plane facing away from the first coil axis. This arrangement simplifies manufacturing.

[0015] According to a preferred embodiment, the device has a circuit board, and the first coil terminal and the second coil terminal are electrically and mechanically connected to the conductor board. The first coil can be easily arranged on the circuit board.

[0016] According to a preferred embodiment, the first coil axis and the second coil axis are arranged parallel to the circuit board. This allows good cooling of the first coil on the side of the circuit board and on the side facing away from the circuit board. In addition, this arrangement saves space because the first coil is oriented lying down instead of standing upright.

[0017] According to a preferred embodiment, the first coil axis and the second coil axis are at an equal distance from the circuit board, which saves space.

[0018] According to a preferred embodiment, the device has a housing part, which extends parallel to the circuit board in the region of the first coil, wherein the first coil is arranged between the housing part and the circuit board. Such a housing part can be positioned close to the first coil and can also be used for heat dissipation / cooling.

[0019] According to a preferred embodiment, the housing part is formed at least partially from aluminum or an aluminum alloy. This reduces the weight and allows good cooling of the first coil via the housing part.

[0020] According to a preferred embodiment, the device has at least two first coils, preferably at least four first coils, and particularly preferably at least five first coils, through which the first magnetic core extends. In the case of multiple first coils, an extended embodiment of the first coils is advantageous because the input side can be spatially separated from the output side.

[0021] According to a preferred embodiment, the first sub-coils of at least two first coils are arranged coaxially relative to each other, and the second sub-coils of at least two first coils are arranged coaxially relative to each other. This enables good separation between the first coil terminals and the second coil terminals of different first coils.

[0022] According to a preferred embodiment, the device is connected to a circuit component which has a power supply connection. The device can thus be used to filter the phase and / or neutral conductor.

[0023] According to a preferred embodiment, the first coil terminals are each connected to a power supply terminal via a circuit component in order to provide a filtered signal at the second coil terminals. The filtered signal is thus all located on one side of the device and is spatially separated from the unfiltered signal.

[0024] According to a preferred embodiment, the first coils include a first first coil, a second first coil, a third first coil, a fourth first coil and a fifth first coil, and the device is connected via a circuit component such that the first first coil, the third first coil and the fifth first coil are provided for filtering the respectively assigned phases, the second first coil and the fourth first coil are provided for filtering the neutral conductor, the second first coil is provided between the first first coil and the third first coil, and the fourth first coil is provided between the third first coil and the fifth first coil. With this arrangement, a neutral conductor coil is provided between two phase coils, and thus a magnetic field in the magnetic core can be well established.

[0025] According to a preferred embodiment, the first winding terminal or the second winding terminal has a first curvature at least partially, and the associated first sub-coil or the second sub-coil has a second curvature, wherein the first curvature and the second curvature have opposite signs. The opposite curvatures can form the two coil terminals at predetermined sides of the first coil and even so still place them relatively far apart from each other.

[0026] According to a preferred embodiment, the first coil is formed by a flat wire.

[0027] According to a preferred embodiment, a charging device for a traction battery has such a device for filtering at least one signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Further details and advantageous improvements of the invention are derived from the exemplary embodiments described below and shown in the drawings, which are not to be understood as limiting the invention in any way, and from the dependent claims. It goes without saying that the features mentioned above and those still to be described below can be used not only in the respectively given combination, but also in other combinations or alone without departing from the scope of the invention. In the drawings:

[0029] Figure 1 A schematic diagram showing an embodiment of a circuit assembly having a device for filtering,

[0030] Figure 2 Shown in top view Figure 1 An embodiment of a device for filtering,

[0031] Figure 3 Shown in top view Figure 1 Another embodiment of the device for filtering,

[0032] Figure 4 Along the Figure 2 The cross section along line IV-IV shows Figure 2 A device having a magnetic core and a coil,

[0033] Figure 5 In the corresponding Figure 4 The cross section shows Figure 4 Another embodiment of the device,

[0034] Figure 6 Shown in spatial diagram Figure 4 The coil, and

[0035] Figure 7 Shown in cross-sectional side view Figure 1 Another embodiment of the device. DETAILED DESCRIPTION

[0036] In the following, identical or identically acting components are provided with the same reference numerals and are generally described only once. The description is organized across the figures to avoid unnecessary repetitions.

[0037] When relative concepts such as left and right depending on the drawings are used hereinafter, these concepts refer to the corresponding drawings.

[0038] Figure 1 A circuit assembly 10 is shown, which has five conductors 51, 52, 53, 54 and 55, which are electrically connected to an energy supply terminal 22, which is connected to an energy supply device 21 (for example, to a power supply network). The conductors 51 to 55 can be connected to three phases L1, L2, L3, a neutral conductor N and a protective conductor PE via the energy supply device 21, for example. There can also be other energy supply devices, such as a single-phase energy supply device with L1, N and PE or a US split-phase energy supply device with HOT1, HOT2 and PE. The circuit assembly 10 has a device 20 for filtering signals at the conductors 51, 52, 53 and 54. Starting from the energy supply terminal 22, the conductor 51 is connected to the conductor 54 via a capacitor 71, the conductor 52 is connected to the conductor 54 via a capacitor 72, and the conductor 53 is connected to the conductor 54 via a capacitor 73. The first coils 31, 32, 33, 34 are then arranged at the conductors 51, 52, 53 and 54, respectively. After the first coils 31, 32, 33, 34, the conductor 51 is connected to the conductor 54 via a capacitor 74, the conductor 52 is connected to the conductor 54 via a capacitor 75, and the conductor 53 is connected to the conductor 54 via a capacitor 76. The conductor 51 is then connected to the conductor 55 via a capacitor 77, the conductor 52 is connected to the conductor 55 via a capacitor 78, the conductor 53 is connected to the conductor 55 via a capacitor 79, and the conductor 54 is connected to the conductor 55 via a capacitor 80. The second coils 35, 36, 37 and 38 are then arranged at the conductors 51, 52, 53 and 54, respectively. The device 20 can also be referred to as an AC filter, and the device is used, for example, as a low-pass filter to filter out high-frequency interference from the energy supply device 21. The device 20 can also be formed, for example, as a bandpass filter, and the first coils 31, 32, 33, 34 can be used for different types of filtering.

[0039] To the right of the device 20 is a schematically illustrated device 220 which cooperates with a plurality of these conductors 51, 52, 53, 54, 55. The device 220 is used, for example, to carry out compensation of leakage currents and will not be described in detail.

[0040] Arranged to the right of the device 220 is the device 23, which is preferably also used as a filter for the conductors 51, 52, 53 and 54. In the device 23, the conductor 51 is connected to the conductor 54 via a capacitor 81, the conductor 52 is connected to the conductor 54 via a capacitor 82, and the conductor 53 is connected to the conductor 54 via a capacitor 83. Then the conductor 51 is connected to the conductor 55 via a capacitor 84, the conductor 52 is connected to the conductor 55 via a capacitor 85, the conductor 53 is connected to the conductor 55 via a capacitor 86, and the conductor 54 is connected to the conductor 55 via a capacitor 87. On the right side thereof, resistors 88, 89, 90 and 91 are arranged in the conductors 51, 52, 53, 54, which resistors are provided, for example, for measuring the current in the conductors 51 to 54. On the right side of the device 23, a throttle 92 is arranged at the conductors 51, 52 and 53, which throttle is used, for example, for power factor calibration.

[0041] The described circuit region is preferably used as an input region for a charging device 95 for a traction battery.

[0042] Figure 2 A device 20 for filtering signals is shown, in the present case for filtering phases L1, L2, L3 and a neutral conductor N. The device 20 has a first magnetic core 60 and at least one first coil 31. In this embodiment, four first coils 31, 32, 33, 34 are provided. The first coils 31, 32, 33, 34 each have a first sub-coil 41 and a second sub-coil 42. The first sub-coil 41 and the second sub-coil 42 are connected to each other via a connecting section 45. The first sub-coil 41 is located on a common first coil axis 47, and the second sub-coil 41 is located on a common second coil axis 48. In other words, the first sub-coils 41 of the first coils 31, 32, 33, 34 are arranged coaxially with each other, and the second sub-coils 42 of the first coils 31, 32, 33, 34 are likewise arranged coaxially with each other.

[0043] The magnetic core 60 extends through both the first sub-coil 41 and the second sub-coil 42 .

[0044] The magnetic core 60 has a first section 61 and a second section 62, which extend parallel to each other and are spaced apart. The first sub-coil 41 is arranged around the first section 61, and the second sub-coil 42 is arranged around the second section 62. The first section 61 and the second section 62 are connected to each other on one side above the third section 63 and are connected to each other on the opposite side of the fourth section 64, so that the magnetic core 60 has an annular structure and can realize an annular magnetic flux. In this embodiment, the third section 63 and the fourth section 64 are connected to the first section 61 and the second section 62 at right angles. Alternatively, the third section 63 and the fourth section 64 can also be provided with a bend / curvature at least partially.

[0045] The first sub-coil 41 is preferably connected on the input side, for example, to the energy supply terminal 22, and the second sub-coil 42 is connected on the output side and provides a filtered signal. This is advantageous because the second sub-coil 42 is spaced apart from the first sub-coil 41 and thus reduces the risk of radiation coupling between the input and the filtered output. In this embodiment, the left side with the input signals L1, L2, L3 and N can be called the "dirty" side, and the filtered right side with the output signals L1', L2', L3' and N' can be called the "clean" side.

[0046] The first sub-coil 41 and the second sub-coil 42 are respectively wound in opposite directions so that when a predetermined current passes through the first coil 31 , induction is caused in the first coil axis 47 in a first direction 133 and induction is caused in the second coil axis 48 in a second direction 134 which is opposite to the first direction 133 .

[0047] Figure 3 Another embodiment of the device 20 is shown. A total of five first coils 31, 34, 32, 134 and 33 are provided. In the case of energy supply with a three-phase power grid, phases L1, L2 and L3 are connected to the first coils 31, 32, 33 and transmitted through them. The neutral conductor N is assigned to the second first coil 34, 134 and transmitted through them. Here, the first coil 34 is preferably arranged between the first coil 31 and the first coil 32, and the first coil 134 is arranged between the first coil 32 and the first coil 33. A parallel circuit 136 for connecting the first coil 34 and the first coil 134 in parallel is preferably provided. The mutual influence of these phases is reduced by arranging a neutral conductor N between the first coils 31, 32, 33 for these phases. The field construction in the magnetic core 60 is thereby improved.

[0048] The first coils 31 , 34 , 32 , 134 , 33 may be referred to as a first first coil 31 , a second first coil 34 , a third first coil 32 , a fourth first coil 134 , and a fifth first coil 33 .

[0049] Figure 4 Shown along Figure 2 The first coil 31 has a first coil terminal 43, a second coil terminal 44, a first sub-coil 41, a second sub-coil 42 and a connecting section 45. The first coil terminal 43 is connected to the second coil terminal 44 via the first sub-coil 41, the connecting section 45 and the second sub-coil 42. The first coil axis 47 and the second coil axis 48 are arranged to be parallel and spaced apart, and the first magnetic core 60 extends through not only the first sub-coil 41 but also the second sub-coil 42.

[0050] A change in the direction of curvature preferably occurs at the connecting section 45 , since the first partial coil 41 and the second partial coil 42 are wound in opposite directions to one another.

[0051] The first coil axis 47 and the second coil axis 48 define a first plane 100 .

[0052] The first coil terminal 43 and the second coil terminal 44 are arranged on a first side 101 of the first plane 100 and point away from the first plane 100. In other words, the coil terminals do not extend parallel to the first plane 100, but the ends of the coil terminals 43, 44 point away from the plane 100. Preferably, the first coil terminal 43 and the second coil terminal 44 point perpendicularly away from the first plane 100 as in this exemplary embodiment.

[0053] The second plane 103 is defined in such a way that it is perpendicular to the first plane 100 and that the first coil axis 47 is contained in the second plane.

[0054] The third plane 106 is defined in such a way that it is perpendicular to the first plane 100 and that the second coil axis 48 is contained in the third plane.

[0055] The first coil connection 43 is preferably arranged at least partially or completely on a side 104 of the second plane 103 facing away from the second coil axis 48 .

[0056] The second coil connection 44 is preferably arranged at least partially or completely on a side 108 of the third plane 106 facing away from the first coil axis 47 .

[0057] By this arrangement of the first coil terminal 43 and the second coil terminal 44, these coil terminals are arranged relatively far away from each other. This is advantageous because the signals at the first coil terminal 43 and the second coil terminal 44 are not or rarely affected by radiation coupling. The first coil 31 acts as a low-pass filter, and higher frequencies at the input end (e.g. at the first coil terminal 43) should be attenuated as much as possible at the output end (e.g. at the second coil terminal 44).

[0058] The first winding terminal 43 at least partially has a first curvature 141, and the first sub-coil 41 assigned thereto has a second curvature 142, wherein the first curvature 141 and the second curvature 142 have opposite signs. Therefore, the curve is like an "S" shape, wherein the curvature radii of the first curvature 141 and the second curvature 142 may be different. In the case of reverse connection of the first coil 31, the corresponding content also applies to the second coil terminal 44.

[0059] Figure 5Another embodiment of the device 20 is shown. The first plane 100, the second plane 103 and the third plane 106 are as shown in Figure 4 As shown and defined in .

[0060] like Figure 4 As shown, the two coil connections 43 , 44 point outward from the first plane 100 on the first side 101 .

[0061] The first coil terminal 43 is not arranged on the side 104 of the second plane 103 facing away from the second coil axis 48, but on the side 105 of the second plane 103 facing the second coil axis 48. This results in a substantially straight line from the first sub-coil 41 to the first coil terminal 43. This is simpler for manufacturing the first coil 31. However, the disadvantage is that the first coil terminal 43 is smaller than Figure 4 Closer to the second coil terminal 44.

[0062] like Figure 4 As shown in FIG. 4 , the second coil connection 44 is arranged on a side 108 of the third plane 106 facing away from the first coil axis 47 .

[0063] Figure 6 Show Figure 4 4. The first coil 31 is preferably formed by a continuous wire 49 between the first coil terminal 43 and the second coil terminal 44. The wire 49 is preferably formed as a flat wire. This results in a compact design of the first coil 31 with a small axial length. The wire 49 is preferably composed of copper or a copper alloy or another metal with good electrical conductivity. The wire 49 preferably has an insulating layer at the surface, such as a lacquer layer, so that short circuits do not occur between the windings of the sub-coils 41 and 42. Alternatively, an insulator, such as insulating paper, can be provided between the windings.

[0064] Figure 7 A further embodiment of the device 20 is shown in a schematic diagram. A circuit board 120 with a plastic carrier 121 and a conductor track 122 are provided. The first coil 31 and the first magnetic core 60 are arranged in a manner corresponding to Figure 4 The illustrated manner is cut away, and the first coil terminal 43 and the second coil terminal 44 are electrically and mechanically connected to the circuit board 120 .

[0065] The second coil 35 is constructed in the same manner as the first coil 31 and is arranged on the second magnetic core 65. The second coil is connected to the circuit board 120 in the same manner. The first magnetic core 60 and the second magnetic core 65 and the coils 31, 32, 33, 34 and 134 are connected to the circuit board 120 in the same manner. Figure 2 or Figure 3 are formed in the same way.

[0066] Also shown as an example Figure 1The capacitors 71, 74, 77 are connected to the circuit board 120. Figure 1 All components of the device 20 can be connected to the circuit board 120. By forming the first coil 31, 32, 33, 34 and the second coil 35, 36, 37, 38, the signal at the conductor 51 to 54 can be Figure 7 The left side of the diagram is conducted to the right side, and the input side on the left is spatially separated from the output side on the right. This reduces interference radiation.

[0067] The first coil axis 47 and the second coil axis 48 are arranged parallel to the circuit board 120. In other words, the first coil 31 is arranged lying on the circuit board 120. The circuit board 120 is at least partially flat, in particular in the area where the first coils 31, 35 are arranged.

[0068] The first coil axis 47 and the second coil axis 48 have an equal distance D from the circuit board 120 .

[0069] The device 20 has a housing part 125, which extends parallel to the printed circuit board 120 in the region of the first coil 31, wherein the first coil 31 is arranged between the housing part 125 and the printed circuit board 120. This allows a compact arrangement and, in addition, a relatively large-area proximity between the first coil 31, 32, 33, 34 or the second coil 35, 36, 37, 38 and the housing part 125. As a result, the housing part 125 can be used well as a cooling element. Contact can also be provided between the first coil and the housing part 125, for example directly or via a (not shown) well-conducting contact element.

[0070] The housing part 125 is preferably formed at least partially from aluminum or an aluminum alloy. This reduces weight on the one hand, and aluminum is well suited for transmitting heat and facilitates good cooling on the other hand. Instead of aluminum or an aluminum alloy, other metals with good heat conduction can also be used.

[0071] Besides the first coils 31 , 32 , 33 , 34 or besides the second coils 35 , 36 , 37 , 38 designed in the same way, the device 20 can of course also have coils designed in a different way (not shown).

[0072] The first coil terminals 43 are each connected to the energy supply terminals 22 via the circuit assembly 10 and provide a filtered signal at the second coil terminals 44. This results in a good separation between the unfiltered input (coil terminals 43) and the filtered output (coil terminals 44).

[0073] When parallel or perpendicular or equal distances are mentioned in this application, these concepts are not conceived in a purely mathematical sense. Rather, it is clear to a person skilled in the art that there are manufacturing tolerances and that, for example, completely exact parallelism cannot be achieved, especially in small embodiments. Such minor deviations are not critical to the operation of the device.

[0074] Of course, various changes and modifications are possible within the scope of the invention.

[0075] Figure 1 The circuit has a combination of L(31-34), C(77-80), L(35-38), C(84-87) to obtain a favorable filtering action. For a simple solution, a simpler combination of L and C can be used.

Claims

1. A device (20) for filtering at least one signal, the device (20) comprising a first magnetic core (60) and at least five first coils, the first magnetic core (60) extending through the first coils, The first coil comprises a first coil terminal (43), a second coil terminal (44), a first sub-coil (41), a second sub-coil (42) and a connecting section (45); the first coil terminal (43) is electrically connected to the second coil terminal (44) via the first sub-coil (41), the connecting section (45) and the second sub-coil (42); The first sub-coil (41) has a first coil axis (47) and the second sub-coil (42) has a second coil axis (48), The first coil axis (47) and the second coil axis (48) are arranged parallel to and spaced apart from each other, and the first magnetic core (60) extends through the first sub-coil (41) and the second sub-coil (42), The device (20) is connected to a circuit component (10), and the circuit component (10) has an energy supply terminal (22). The at least five first coils include a first first coil (31), a second first coil (34), a third first coil (32), a fourth first coil and a fifth first coil (33), and the device (20) is connected via a circuit component (10) as follows: the first first coil (31), the third first coil (32) and the fifth first coil (33) are configured to filter the respectively assigned phases (L1, L2, L3), the second first coil (34) and the fourth first coil are configured to filter the neutral conductor (N), the second first coil (34) is arranged between the first first coil (31) and the third first coil (32), and the fourth first coil is arranged between the third first coil (32) and the fifth first coil (33).

2. The device (20) according to claim 1, wherein: The first sub-coil (41) and the second sub-coil (42) are wound in opposite directions so that when a predetermined current passes through the at least five first coils, induction is caused in a first direction (133) in the first coil axis (47) and induction is caused in a second direction (134) in the second coil axis (48), the second direction (134) being opposite to the first direction (133).

3. The device (20) according to claim 1 or 2, wherein: The first coil axis (47) and the second coil axis (48) define a first plane (100).

4. The device according to claim 3, wherein: The first coil terminal (43) and the second coil terminal (44) are arranged on a first side (101) of the first plane (100) and point away from the first plane (100).

5. The device (20) according to claim 3, wherein: The first coil terminal (43) and the second coil terminal (44) are oriented vertically away from the first plane (100).

6. The device (20) according to claim 3, wherein: A second plane (103) is defined in such a way that the second plane is perpendicular to the first plane (100) and the first coil axis (47) is contained in the second plane, wherein a third plane (106) is defined in such a way that the third plane is perpendicular to the first plane (100) and the second coil axis (48) is contained in the third plane, The first coil terminal (43) is arranged on a side surface (104) of the second plane (103) that faces away from the second coil axis (48). The second coil connection (44) is arranged on a side (108) of the third plane (106) facing away from the first coil axis (47).

7. The device (20) according to claim 3, wherein: A second plane (103) is defined in such a way that the second plane is perpendicular to the first plane (100) and the first coil axis (47) is contained in the second plane, wherein a third plane (106) is defined in such a way that the third plane is perpendicular to the first plane (100) and the second coil axis (48) is contained in the third plane, The first coil terminal (43) is arranged on a side surface (105) of the second plane (103) facing the second coil axis (48), The second coil terminal (44) is arranged on a side (108) of the third plane (106) facing away from the first coil axis (47).

8. The device (20) according to claim 1 or 2, comprising a circuit board (120), wherein: The first coil terminal (43) and the second coil terminal (44) are electrically and mechanically connected to the circuit board (120).

9. The device (20) according to claim 8, wherein: The first coil axis (47) and the second coil axis (48) are arranged parallel to the circuit board (120).

10. The device (20) according to claim 8, wherein: The first coil axis (47) and the second coil axis (48) have an equal distance (D) from the circuit board (120).

11. The device (20) according to claim 8, comprising a housing part (125) which extends parallel to the printed circuit board (120) in the region of the at least five first coils, wherein: The at least five first coils are arranged between the housing component (125) and the circuit board (120).

12. The device (20) according to claim 11, wherein: The housing part (125) is formed at least partially from aluminum or an aluminum alloy.

13. The device (20) according to claim 1 or 2, wherein: The first sub-coils (41) of the at least five first coils are arranged coaxially relative to one another, and the second sub-coils (42) of the at least five first coils are arranged coaxially relative to one another.

14. The device (20) according to claim 1 or 2, wherein: The first coil terminals (43) are connected to the power supply terminals (22) via the circuit components (10) respectively, so as to provide filtered signals (L1', L2', L3', N') at the second coil terminals (44).

15. The device (20) according to claim 1 or 2, wherein: The first coil terminal (43) or the second coil terminal (44) has a first curvature (141) at least partially, and the associated first sub-coil (41) or the second sub-coil (42) has a second curvature (142), wherein the first curvature (141) and the second curvature (142) have opposite signs.

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