DE102016217059A1 - Electronic assembly for detecting an electrical quantity in an electrical conductor - Google Patents

Abstract

An electronic assembly (10) for detecting an electrical quantity in an electrical conductor (24) is proposed. This comprises a printed circuit board (20) having a first side (21) and a second side (22) facing away from the first side (21), wherein an electrical component (30) is arranged on the first side (21). Furthermore, the electronic assembly (10) comprises a ferromagnetic ring (40) which has a first recess (45), wherein the electrical component (30) is arranged at least partially in the first recess (45), wherein at least a first sub-segment (41 ) of the ring (40) on the first side (21) and arranged at least a second sub-segment (42) on the second side (22) of the ring (40), wherein the electrical conductor (24) through the ring opening (490) is guided. It is provided that the ring (40) has at least one further recess (46), so that the ring (40) formed in two parts and the circuit board (20) is at least partially disposed in the at least one further recess (46).

Description

The present invention relates to an electronic assembly for detecting an electrical quantity in an electrical conductor having the features of independent claim 1, and to a manufacturing method for such an assembly.

State of the art

The EP 2 333 567 B1 discloses an apparatus for measuring a current flowing through a current conductor, comprising a ring concentrator of ferromagnetic material having an air gap, the ring concentrator extending in a plane substantially perpendicular to the conductor, and wherein a thickness of the ring concentric measured perpendicular to the plane is at least one factor 10 is less than an in-plane measured width of the ring concentrator. Furthermore, a magnetic field sensor is provided with a semiconductor chip and a magnetic element mounted on the semiconductor chip, wherein the magnetic field sensor is arranged below or above the air gap of the ring concentrator and bridges the air gap, and wherein a first end portion of the magnetic element and a first end portion of the ring concentrator and a second end portion of the magnetic element and a second end portion of the ring concentrator overlap, and a shield which partially encloses the ring concentrator in the plane defined by the ring concentrator.

Disclosure of the invention

According to the invention, an electronic assembly for detecting an electrical variable in an electrical conductor is proposed. This comprises a printed circuit board with a first side and a second side facing away from the first side, wherein an electrical component is arranged on the first side. Furthermore, the electronic assembly comprises a ferromagnetic ring having a first recess, wherein the electrical component is at least partially disposed in the first recess, wherein at least a first sub-segment of the ring arranged on the first side and at least a second sub-segment on the second side of Is arranged ring, wherein the electrical conductor is guided through the ring opening. In this case, the ring has at least one further recess, so that the ring is formed in two parts and the circuit board is at least partially disposed in the at least one further recess.

An electrical variable in the present invention can be understood, for example, to mean a current or a voltage. Furthermore, this can also be understood as meaning variables derived from the current intensity and / or the voltage, such as a magnetic field strength or a magnetic excitation.

Advantages of the invention

The two-part design of the ring leads to a production advantage, since such a design allows easy attachment of the two sub-segments on both sides of the circuit board. This eliminates a tedious threading of the circuit board in the recess. Furthermore, a flexible arrangement of the ring on the circuit board is possible because it does not necessarily have to be arranged on the edge of the circuit board due to the further recess. Due to its ferromagnetic properties, the ring also bundles magnetic field lines particularly well. These are thus performed concentrated by the electrical component, whereby the electronic assembly is altogether suitable for a field-robust measurement of the current. In this case, the physical effect is used that form around a current-carrying conductor around circular magnetic field lines, which can be measured on the one hand and allow a quantitative inference to the current.

Further advantageous embodiments and modifications of the invention are made possible by the features specified in the subclaims.

Particularly advantageously, the electrical conductor is designed as a conductor track of the printed circuit board. This avoids the use of one or more cables, which take up additional space and cause costs, and it is also possible to measure a current even if the conductor is not directly accessible but is part of the printed circuit board. Furthermore, the current of the conductor track can be measured even if further current-carrying conductors are located in the vicinity of the electronic module.

In an advantageous embodiment, the electrical component is designed as a magnetic field sensor. This shows the advantage that without additional meters within the circuit, a measurement of the current is possible, which allows a non-contact measurement of the current-carrying conductor. As already described, this shows in the physical effect that a current-carrying conductor forms circular magnetic field lines and these are guided in bundled fashion by the magnetic field sensor.

Particularly advantageously, the electronic module has a further component, in particular an electrical sensor designed as a magnetic field sensor Component, on, wherein the further component is at least partially disposed in the further recess. The use of a further magnetic field sensor has the particularly advantageous effect that on the one hand two independent measurements can be carried out, whereby results can be compared with each other and a redundant measuring system is provided. This makes it easy to detect errors. On the other hand, thereby a symmetrical structure of the two ring segments is possible, which allows a particularly easy attachment of the two ring segments on the circuit board. Due to the symmetry individual ring segments can be advantageously easily replaced.

In an advantageous embodiment, the ring has an axial direction, which is arranged substantially parallel to the electrical conductor. This advantageously improves the measurement accuracy, since the magnetic field lines run in a circle around the conductor and thus the best possible concentration of the magnetic field lines within the ferromagnetic ring is possible. Substantially parallel in the sense of the disclosed subject matter means that in this case certain manufacturing tolerances are to be considered, which are also to be understood here as being parallel. For example, these can amount to up to 5% deviation from mathematical exact parallelism.

Particularly advantageously, the ring comprises at least partially a ferritic phase. A material with ferritic phase allows for a best possible bundling of the magnetic field lines within the ring and on the other hand a particularly good shielding of the magnetic field lines to be measured against external influences. Such external influences can be, for example, magnetic fields of other electrical conductors.

In a particularly advantageous embodiment, the first sub-segment has a first end face, the first end face defining the first recess and facing the electrical component. The second sub-segment has a second end face, wherein the second end face defines the first recess opposite to the first end face. As a result, the first end face and the second end face overlap at least partially. The first sub-segment has a third end face, the third end face defining the further recess and facing the printed circuit board. The second sub-segment has a fourth end face, wherein the fourth end face delimits the further recess opposite the third end face, wherein the third end face and the fourth end face overlap at least partially. Due to the arrangement of the two sub-segments of the ring, in which the faces face each other and overlap, is ensured in an advantageous manner that the magnetic field lines are forwarded from the first sub-segment of the ring in the second sub-segment, which results for example, the current measurement, for example with respect to accuracy and sensitivity of the current measurement, greatly improved.

Particularly advantageously, a first radial center axis of the first subsegment of the ring and / or a second radial center axis of the second subsegment of the ring are arranged on the electrical conductor. This has the advantage that the magnetic field lines - due to their circular arrangement around the conductor - can best be absorbed by the ring and thus be focused by the magnetic field sensor. This advantageously increases the measurement accuracy.

Particularly advantageously, the first sub-segment and / or the second sub-segment are at least partially annular, which advantageously corresponds to the annular formation of the magnetic field lines around the electrical conductor. As a result, the magnetic field lines can be concentrated and bundled as best as possible by the ferromagnetic ring.

In an advantageous embodiment, the first sub-segment and / or the second sub-segment by means of at least one connecting means, in particular a double adhesive tape or an adhesive or a solder attached to the circuit board. As a result, the entire electronic assembly is particularly stable to external influences and disruptive effects. Furthermore, by means of the connecting means, for example, a compensating layer can be formed between the components of the assembly, which compensates for different thermal expansion coefficients of the components.

Also advantageous is a method for producing an electronic assembly, in particular for detecting an electrical variable in an electrical conductor, the method comprising a step of first providing a printed circuit board with a first side and a second side facing away from the first side, a step of the second Providing an electrical component and a step of thirdly providing a ferromagnetic ring having a first recess and at least one further recess, the ring having at least a first sub-segment and at least a second sub-segment. Furthermore, the method comprises a step of first arranging the electrical component on the first side of the printed circuit board and a step of secondly arranging the at least one first partial segment of the ring on the first side of the printed circuit board Circuit board, such that the electrical component is at least partially disposed in the first recess, and the at least one second sub-segment on the second side, such that the electrical conductor is guided through the annular opening.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it

1a . 1b and 1c a ring consisting of two sub-segments;

2 a cross section through a first embodiment of the electronic assembly according to the invention;

3 a cross section through a second embodiment of the electronic assembly according to the invention; and

4 a cross section through a third embodiment of the electronic module according to the invention.

5 a method for producing the electronic assembly according to the invention in the form of a flow chart.

To illustrate the geometric arrangements is in the 1 to 4 a Cartesian coordinate system with an x-direction x, a y-direction y and a z-direction z shown.

Embodiments of the invention

1a . 1b and 1c show an example of a ring 40 how it can be understood within the meaning of the disclosed subject matter. The ring 40 is cylindrical and two-part, consisting of a first sub-segment 41 and a second subsegment 42 , educated. At the first subsegment 41 is a first outer shell wall 410 and a first inner jacket wall 411 educated. At the second subsegment 42 is a second outer shell wall 420 and a second inner jacket wall 421 educated.

The first inner jacket wall 411 and the second inner shell wall 421 enclose the ring opening 490 ,

The first subsegment 41 includes a first footprint 412 which is the first subsegment 41 perpendicular to the y-direction and perpendicular to the first outer shell wall 410 and perpendicular to the first inner shell wall 411 concludes. Furthermore, one of the first base area 412 remote second base 413 includes, which is the first subsegment 41 opposite to the first base 412 perpendicular to the y-direction and perpendicular to the first outer shell wall 410 and perpendicular to the first inner shell wall 411 concludes.

The second subsegment 42 includes a third base 422 which is the second subsegment 42 perpendicular to the y-direction and perpendicular to the second outer shell wall 420 and perpendicular to the second inner shell wall 421 concludes. Furthermore, one of the third base 422 opposite fourth base 423 which comprises the second subsegment 42 opposite to the third base 422 perpendicular to the y-direction and perpendicular to the second outer shell wall 410 and perpendicular to the second inner shell wall 411 concludes.

The diameter d1 of the ring 40 corresponds to 1a . 1b and 1c each of the maximum extent of the first subsegment 41 and the second subsegment 42 in X direction. The diameter d2 corresponds to the diameter of the ring opening 490 ,

In 1a are the first subsegment 41 and the second subsegment 42 arranged such that both sub-segments 41 . 42 without a first recess 45 and / or a second recess 46 are arranged mirror-symmetrically to the xy plane. The xy plane thus represents the spatial separation of the first subsegment 41 from the second subsegment 42 dar. The ring opening 490 is completely from the first inner shell wall 411 and the second inner shell wall 421 enclosed.

In 1b are the first subsegment 41 and the second subsegment 42 arranged such that the two sub-segments 41 . 42 with a first recess 45 and another recess 46 are formed mirror-symmetrically to the xy plane, wherein the first sub-segment 41 by a distance s / 2 in the positive z-direction relative to the position of the first sub-segment 41 in 1a is shifted and the second subsegment 42 by the same distance s / 2 in negative z-direction with respect to the position of the second sub-segment 42 in 1a is moved. Thus, the distance in the y-direction between the first sub-segment corresponds 41 and the second subsegment 42 the route s. The distance s is less than or equal to the diameter d.

The first subsegment 41 has a first end face 43 on, with the first end face 43 the first recess 45 limited and substantially parallel to the xy plane of the xy plane faces. Furthermore, the first subsegment 41 a third face 47 on, with the third end face 47 the second recess 46 limited and substantially parallel to the xy plane of the xy plane faces. The second subsegment 42 has a second end face 44 on, with the second end face 44 the first recess 45 opposite to the first end face 43 limited and substantially parallel to the first end face 43 is. Furthermore, the second subsegment has 42 a fourth face 48 on, with the fourth end face 48 the second recess 46 opposite to the third end face 47 limited and substantially parallel to the third end face 47 is. The first face 43 and the second end face 44 as well as the third face 47 and the fourth end face 48 are arranged mirror-symmetrically to the xy plane.

In 1c are the first subsegment 41 and the second subsegment 42 arranged such that - starting from the in 1a illustrated ring - a part of the ring 40 is missing by a section with the width s is substantially parallel to the xy plane removed. The missing segments correspond to the first recess 45 and the second recess 46 , The first subsegment 41 points - similar to the representation of the ring 40 in 1b - a first face 43 on, with the first end face 43 the first recess 45 limited and substantially parallel to the xy plane of the xy plane faces. Furthermore, the first subsegment 41 a third face 47 on, with the third end face 47 the second recess 46 limited and substantially parallel to the xy plane of the xy plane faces. The second subsegment 42 has a second end face 44 on, with the second end face 44 the first recess 45 opposite to the first end face 43 limited and substantially parallel to the first end face 43 is. Furthermore, the second subsegment has 42 a fourth face 48 on, with the fourth end face 48 the second recess 46 opposite to the third end face 47 limited and substantially parallel to the third end face 47 is. The first face 43 and the second end face 44 as well as the third face 47 and the fourth end face 48 are arranged mirror-symmetrically to the xy plane.

The distance between the first subsegment 41 and the second subsegment 42 also corresponds to the distance s, where the distance s must be less than or equal to the diameter d1.

The ring 40 according to 1a . 1b and 1c is shown as an ideal ring. Basically, the ring 40 be formed in a deviating from the shapes shown form. It is crucial that the ring 40 is formed such that the first sub-segment 41 and the second subsegment 42 on the circuit board 20 are mounted so that the of a current-carrying conductor 25 the circuit board 20 outgoing magnetic field lines 500 bundled and by an electrical and / or electronic component 30 , in particular a magnetic field sensor, are conducted. Here, the shape of the ring 40 for example, oval or square.

2 shows a cross section through a first embodiment of the electronic assembly according to the invention 10 which in particular for detecting an electrical variable in an electrical conductor 24 is trained. The electronic assembly 10 includes a printed circuit board 20 with a first page 21 and one from the first page 21 remote second side 22 ,

In this embodiment, the circuit board 20 for example, a printed circuit board in FR4 design or higher, so for example, a printed circuit board made of glass fiber reinforced epoxy resin as a carrier material of printed conductors. The circuit board 20 but it can also be an HDI circuit board (High Density Interconnect PCB), a LTCC (Low Temperature Cofired Ceramics) or another suitable rigid or flexible circuit board. On the circuit board 20 may be one or more, interconnected by interconnects, electrical and / or electronic components 30 , such as resistors, coils, capacitors, etc. may be arranged.

In the in 2 illustrated embodiment is an electronic module 10 with a circuit board 20 and with an electrical and / or electronic component 30 shown here, which is exemplified by a magnetic field sensor 31 , So a sensory device for measuring magnetic flux densities 500 , acts. This may, for example, be a so-called SQUID (Superconducting Quantum Interference Device), an XMR (X-Magneto Resistive) sensor, a Hall sensor, a coil or any other element suitable for measuring the magnetic field.

In this embodiment, the circuit board 20 an electrical conductor 24 on, which as a conductor track 25 the circuit board 20 is trained. The conductor track 25 is, for example, in one piece from electrically conductive metal - such as copper - made. The circuit board 20 can of course also a variety of tracks 25 and in particular also be designed as a multilayer printed circuit board. Furthermore, the electrical conductor 24 also be designed as a cable, for example, on the circuit board 20 is arranged and through the ring opening 490 is guided.

At the first page 21 the circuit board 20 is the first subsegment 41 of the ring 40 arranged. On the second page 22 the guide plate 20 is the first subsegment 41 opposite the second subsegment 42 arranged such that the circuit board 20 in the first recess 45 and the second recess 46 is arranged and the electronic and / or electrical component 30 which is on the first page 21 the circuit board 20 is arranged, at least partially in the first recess 45 between the circuit board 20 and the first subsegment 41 is arranged. The second subsegment 42 is so on the second page 22 the circuit board 20 arranged that the first end face 43 and the second end face 44 as well as the third face 47 and the fourth end face 48 at least partially overlap. In this case, the respective end surfaces advantageously overlap at least in such a way that the magnetic field lines 500 on the one hand bundled by the electrical and / or electronic component 30 and the other part of the first subsegment 41 in the second subsegment 42 and vice versa. For the purposes of the invention is characterized a ring 40 given.

The first subsegment 41 and the second subsegment 42 are here by way of example by means of a connecting means 60 with the circuit board 20 and / or the electrical and / or electronic component 30 connected. This can be, for example, double-sided adhesive tape. This advantageously also allows attachment of the sub-segments 41 . 42 over head, as the adhesion between the circuit board 20 and the sub-segments 41 . 42 directly enters. Furthermore, it may be in the connecting means 60 also be a liquid adhesive or an adhesive tape. Furthermore, the sub-segments 41 . 42 also be soldered. It is advantageous that the arrangement is particularly stable. Furthermore, the solder material is usually metallic, which has a distributive effect on the bundling of the magnetic field lines. Furthermore, the two sub-segments 41 . 42 also be attached by pressing.

This shows the advantage over the other connection possibilities that no further work step is necessary because the sub-segments 41 . 42 directly on the circuit board 20 be pressed. This can be done for example by the sub-segments 41 . 42 be pressed into provided recesses on the circuit board, which are not shown in the figures.

The first subsegment 41 and the first second subsegment 42 can thereby by means of the connecting means 60 be arranged such that, for example, the first end face 43 directly on the electrical and / or electronic component 30 is arranged and the third end face 47 with the first page 21 the circuit board 20 does not close directly. Furthermore, the first subsegment 41 also in such a way by means of the connecting means 60 on the circuit board 20 be arranged that - as in 2 shown - both the first end face 43 as well as the third front page 47 not with the circuit board 20 concludes. The same applies to the attachment of the second subsegment 42 on the second page 22 the circuit board 20 by means of the connecting means 60 ,

3 shows a cross section through a second embodiment of the electronic assembly according to the invention, which is designed in particular for detecting an electrical variable in an electrical conductor.

The assembly differs here 10 opposite to the 2 disclosed assembly 10 in that another component 31 which, for example, as a magnetic field sensor 32 may be formed, located in the second recess, wherein the further component 31 also on the first page 21 the circuit board 20 or on the second page 22 the circuit board 20 is appropriate. The other component 31 but may for example be a spacer.

4 shows a cross section through a third embodiment of the electronic assembly according to the invention, which is designed in particular for detecting an electrical variable in an electrical conductor. The assembly differs here 10 opposite to the 2 disclosed assembly 10 in that the first subsegment 41 such on the circuit board 20 is arranged that the third end face 47 directly with the circuit board 20 optionally also using a thin layer of bonding agent 60 as a liner. This is the first subsegment 41 formed such that the second recess 46 in the z-direction is smaller by the distance in z-direction between the third end face 47 and the fourth end face 48 For example, to the extent of the electrical and / or electronic component 30 in the z-direction - is smaller than the distance in the z-direction between the first end face 43 and the second end face 44 ,

5 shows by way of example with reference to a flow chart a manufacturing method 600 for a possible production of the electrical assembly according to the invention 10 ,

In step 601 the procedure begins 600 ,

In step 610 becomes a circuit board 20 with a first page 21 and one from the first page 21 remote second side 22 provided.

In step 620 becomes an electrical component 30 provided.

In step 630 becomes a ferromagnetic ring 40 which is a first recess 45 and at least one more recess 46 provided. This shows the ring 40 at least one first subsegment 41 and at least a second subsegment 42 on.

In step 640 becomes the electrical component 30 on the first page 21 arranged. In step 650 this will be at least a first subsegment 41 of the ring 40 on the first page 21 arranged such that the electrical component 30 at least partially in the first recess 45 is arranged. Furthermore, this becomes at least a second subsegment 42 on the second page 22 such that the electrical conductor 24 through the ring opening 40 is guided, arranged.

In step 660 the procedure ends 600 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2333567 B1 [0002]

Claims (12)

Electronic assembly ( 10 ) for detecting an electrical quantity in an electrical conductor ( 24 ), comprising a printed circuit board ( 20 ) with a first page ( 21 ) and one from the first page ( 21 ) facing away from the second side ( 22 ), whereas on the first page ( 21 ) an electrical component ( 30 ), further comprising a ferromagnetic ring ( 40 ), which has a first recess ( 45 ), wherein the electrical component ( 30 ) at least partially in the first recess ( 45 ), wherein at least a first subsegment ( 41 ) of the ring ( 40 ) on the first page ( 21 ) and at least one second subsegment ( 42 ) on the second page ( 22 ) of the ring ( 40 ), wherein the electrical conductor ( 24 ) through a ring opening ( 490 ), the ring ( 40 ) at least one further recess ( 46 ), so that the ring ( 40 ) formed in two parts and the circuit board ( 20 ) at least partially in the at least one further recess ( 46 ) is arranged. Electronic assembly ( 10 ) according to claim 1, characterized in that the electrical conductor ( 24 ) as a conductor track ( 25 ) of the printed circuit board ( 20 ) is trained. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the electrical component ( 30 ) is designed as a magnetic field sensor. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the electronic assembly ( 10 ) another component ( 31 ), in particular an electrical component designed as a magnetic field sensor ( 32 ), wherein the further component ( 31 ) at least partially in the further recess ( 46 ) is arranged. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the ring ( 40 ) has an axial direction (M40) which is substantially parallel to the electrical conductor (M40) 24 ) is arranged. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the ring ( 40 ) at least partially comprises a ferritic phase. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the first subsegment ( 41 ) a first end face ( 43 ), wherein the first end face ( 43 ) the first recess ( 45 ) and the electrical component ( 30 ), wherein the second subsegment ( 42 ) a second end face ( 44 ), wherein the second end face ( 44 ) the first recess ( 45 ) opposite the first end face ( 43 ), wherein the first end face ( 43 ) and the second end face ( 44 ) overlap at least partially, the first subsegment ( 41 ) a third end face ( 47 ), wherein the third end face ( 47 ) the further recess ( 46 ) and the printed circuit board ( 20 ) and the second subsegment ( 42 ) a fourth end face ( 48 ), wherein the fourth end face ( 48 ) the further recess ( 46 ) opposite to the third end face ( 47 ), wherein the third end face ( 47 ) the fourth end face ( 48 ) at least partially overlap. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that a first radial central axis (M41) of the first subsegment ( 41 ) of the ring ( 40 ) and / or a second radial center line (M42) of the second subsegment ( 42 ) of the ring ( 40 ) on the electrical conductor ( 24 ) are arranged. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the first subsegment ( 41 ) and / or the second subsegment ( 42 ) are at least partially circular. Electronic assembly ( 10 ) according to one of the preceding claims, characterized in that the first subsegment ( 41 ) and / or the second subsegment ( 42 ) by means of at least one connecting means ( 60 ), in particular a double adhesive tape or an adhesive or a solder, with the printed circuit board ( 20 ) are attached. Procedure ( 600 ) for producing an electronic assembly ( 10 ), in particular for detecting an electrical variable in an electrical conductor ( 24 ), the process comprising the following steps: 610 ) of a printed circuit board ( 20 ) with a first page ( 21 ) and one from the first page ( 21 ) facing away from the second side ( 22 ); • second deployment ( 620 ) of an electrical component ( 30 ); • Third Provision ( 630 ) of a ferromagnetic ring ( 40 ), which has a first recess ( 45 ) and at least one further recess ( 46 ), wherein the ring ( 40 ) at least a first subsegment ( 41 ) and at least a second subsegment ( 42 ) having; • First order ( 640 ) of the electrical component ( 30 ) on the first page ( 21 ); and second order ( 650 ) of the at least one first subsegment ( 41 ) of the ring ( 40 ) on the first page ( 21 ), - such that the electrical component ( 30 ) at least partially in the first recess ( 45 ), and the at least one second subsegment ( 42 ) on the second page ( 22 ), - such that the electrical conductor ( 24 ) through the ring opening ( 40 ) is guided. Procedure ( 600 ) according to claim 11, characterized in that the electronic assembly ( 10 ) is produced according to at least one of claims 2 to 10.

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