Current measuring assembly and method for installing such current measuring assembly

Abstract

The invention relates to a current measuring assembly and a method for installing such a current measuring assembly. The current measuring arrangement has a magnetic flux conductor arrangement (20) comprising at least one magnetic flux conductor (24) at least partially surrounding at least one current conductor (1), and at least one magnetic field sensor (12), the at least one magnetic field sensor is arranged on the circuit carrier (3) in an air gap (LS) of the at least one magnetic flux conductor (24) and is designed to detect magnetic field lines in the at least one magnetic flux conductor (24), said magnetic field lines being caused by a current flow in the at least one current conductor (1). A magnetic flux conductor arrangement (20) having at least one magnetic flux conductor (24) is embodied in multiple parts with a base body (20A), which is connected to the circuit carrier (3) and forms at least one receiving space (22) for the at least one current conductor (1), and with a cover part (20B), which is connected to the base body (20A) and covers the at least one receiving space (22) for the at least one current conductor (1).

Description

Technical Field

[0001] The invention relates to a current measuring arrangement for detecting a current in a current conductor and also to a method for installing such a current measuring arrangement. Background Art

[0002] A current measuring assembly for detecting a current in a current conductor is known from EP 3 370 072 B1 and EP 3 620 799 B1 as well as US 2015 / 0309080 A1. The current measuring assembly comprises a flux conductor with an air gap, which at least partially surrounds the current conductor, and a magnetic field sensor, which is arranged on a circuit carrier in the air gap of the flux conductor and is implemented for detecting magnetic field lines in at least one flux conductor of a magnetic field caused by a current flowing in the at least one current conductor. Summary of the invention

[0003] The current measuring assembly for detecting a current in a current conductor having the features of independent claim 1 has the following advantages: Due to the multi-part embodiment of the flux conductor assembly, the current conductor can be easily introduced into a corresponding receiving space of the base body of the flux conductor assembly in order to realize the current measurement. As a result, a simple installation concept of the current measuring assembly can be realized, wherein the current conductor can be inserted into the receiving space of the base body parallel to the circuit carrier and the receiving space can then be closed by a cover of the flux conductor assembly. This enables industrial and automated installation of the current measuring assembly. Furthermore, the current conductor does not have to be inserted into the receiving space from the side or be embodied in two parts.

[0004] Furthermore, the embodiment of the current measuring component allows tolerance compensation, in particular in the height of the receiving space. Furthermore, the distance tolerances between the circuit carrier or the base body of the flux conductor component and the current conductor and the cover of the flux conductor component can be minimized, so that structural space can be saved.

[0005] An embodiment of the present invention provides a current measuring component for detecting a current in at least one current conductor, the current measuring component having a flux conductor component and at least one magnetic field sensor, the flux conductor component including at least one flux conductor at least partially surrounding the at least one current conductor, the at least one magnetic field sensor being arranged on a circuit carrier in an air gap of the at least one flux conductor. The at least one magnetic field sensor is implemented to detect magnetic field lines of a magnetic field in the at least one flux conductor caused by a current flow in the at least one current conductor. In this case, the flux conductor component having the at least one flux conductor is implemented in a multi-part manner with a base body and a cover, the base body being connected to the circuit carrier and forming at least one receiving space for the at least one current conductor, the cover being connected to the base body and covering the at least one receiving space for the at least one current conductor.

[0006] In addition, a method for installing such a current measuring component for detecting a current in at least one current conductor is proposed. The method comprises the following steps: providing a circuit carrier equipped with at least one magnetic field sensor and at least one current conductor and a multi-piece magnetic flux conductor component, which comprises a base body and a cover. At least two magnetically conductive side parts are arranged in the base body, and at least one magnetically conductive bottom part is arranged in the cover. Connecting the base body of the multi-piece magnetic flux conductor component with the equipped circuit carrier. Introducing at least one current conductor into at least one receiving space of the base body of the magnetic flux conductor component, so that at least one current conductor is arranged between the magnetically conductive side parts. Connecting the cover of the multi-piece magnetic flux conductor component with the base body of the multi-piece magnetic flux conductor component, so that the cover covers at least one receiving space of the at least one current conductor, and at least one magnetically conductive bottom part of the cover and at least two magnetically conductive side parts of the base body form at least one magnetic flux conductor of the multi-piece magnetic flux conductor component.

[0007] In the present case, a magnetic field sensor can be understood as a Hall sensor, which detects the magnetic field lines of a magnetic field in a flux conductor, which magnetic field is caused by the current flow to be measured in the current conductor. The flux conductor preferably has a U-shape and a C-shape in order to form an air gap in which the magnetic field sensor is arranged.

[0008] The current measuring arrangement for detecting a current in a current conductor specified in independent claim 1 and the method for installing such a current measuring arrangement specified in independent claim 10 can be advantageously improved by the measures and developments listed in the dependent claims.

[0009] It is particularly advantageous that, in order to form at least one receiving space for at least one corresponding current conductor, the base body of the multi-part flux conductor assembly can respectively include two mutually parallel magnetically conductive side parts of at least one corresponding flux conductor, which are respectively at least partially covered by an electrically insulating sheath and connected to each other via an electrically insulating connecting plate. Preferably, the connecting plate can connect the two parallel magnetically conductive side parts to each other, so that the two side parts protrude from the connecting plate on two sides. In this case, the end of the magnetically conductive side part facing the circuit carrier can preferably be free of a sheath, and the end of the magnetically conductive side part facing away from the circuit carrier can be covered by a sheath. Preferably, the connecting plate and the sheath of the magnetically conductive side part can be made of plastic in a common injection molding process, wherein the magnetically conductive side part can be inserted into the injection molding tool as an insert. In order to connect the base body to the circuit carrier, suitable first fixing elements, such as latching elements, clips, press-in pins, etc., can be arranged on the connecting plate or formed on the connecting plate, and the first fixing elements can interact with matching second fixing elements of the circuit carrier, such as latching recesses, fixing openings, etc. In a further variant, the base body can be designed in such a way that it can be soldered to the circuit carrier.

[0010] In an advantageous embodiment of the current measuring assembly, in order to cover at least one receiving space for at least one corresponding current conductor, the cover of the multi-part flux conductor assembly can respectively include at least one magnetically conductive bottom part of the corresponding flux conductor, which is at least partially covered by an electrically insulating sheath. Preferably, the sheath of the magnetically conductive bottom part can be produced from plastic in an injection molding process, wherein the magnetically conductive bottom part can be inserted into the injection molding tool as an insert. In order to connect the cover to the base body, suitable first fixing elements, such as latching elements, clips, press-in pins, etc., can be arranged or formed on the cover, which first fixing elements can interact with matching second fixing elements of the base body, such as latching recesses, fixing openings, etc.

[0011] In another advantageous design of the current measuring component, the cover can be connected to the base so that the magnetic bottom portion extends perpendicularly to the two parallel arranged magnetic side portions and at least partially covers these magnetic side portions, so that the magnetic bottom portion and the two magnetic side portions can form a corresponding magnetic flux conductor with an air gap.

[0012] In another advantageous embodiment of the current measuring assembly, in order to form a plurality of accommodation spaces for a plurality of current conductors, the base of the multi-piece flux conductor assembly can respectively include two parallel magnetically conductive side portions of the corresponding flux conductor, the magnetically conductive side portions are respectively at least partially covered by an electrically insulating sheath and are connected to each other by an electrically insulating connecting plate. The cover of the multi-piece flux conductor assembly can respectively include at least one magnetically conductive bottom portion of the corresponding flux conductor for each of the plurality of accommodation spaces for the plurality of current conductors, the magnetically conductive bottom portion being at least partially covered by an electrically insulating sheath. For example, for current measurement in three current conductors of a three-phase drive, three accommodation spaces can be arranged side by side, the accommodation spaces respectively including flux conductors. Thus, three magnetic field sensors can be arranged on the circuit carrier at intervals from each other, the magnetic field sensors respectively detecting magnetic field lines of the magnetic field caused by the current flow through the current conductor in the corresponding flux conductor. Each accommodation space respectively includes two magnetically conductive side portions and a magnetically conductive bottom portion for forming a flux conductor. Here, the magnetically conductive side portions arranged side by side of the three accommodation spaces can be connected to each other by a common electrically insulating connecting plate. The three magnetically conductive bottom parts can be arranged in a common cover.

[0013] In a further advantageous embodiment of the current measuring arrangement, the electrically insulating connecting plate of the base body can extend partially parallel to the first side surface of the circuit carrier and perpendicular to the two parallel, magnetically conductive side surfaces and be connected to the circuit carrier.

[0014] In a further advantageous embodiment of the current measuring assembly, the free, uncovered ends of the magnetically conductive side parts can protrude from the electrically insulating connection plate in the direction of the circuit carrier and respectively pass through an introduction opening introduced into the circuit carrier. The introduction openings can preferably be introduced into the circuit carrier as slots, between which the magnetic field sensors are arranged on the circuit carrier.

[0015] In a further advantageous embodiment of the current measuring arrangement, at least one current conductor can be connected to the base body or the cover. This allows a particularly simple arrangement of the current conductor in the corresponding receiving space.

[0016] In a further advantageous embodiment of the current measuring assembly, the cover can be connected to a housing part of the current measuring assembly, so that the corresponding receiving space can be covered by placing the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Embodiments of the present invention are shown in the drawings and explained in more detail in the following description.In the drawings, the same reference numerals represent components or elements that perform the same or similar functions.

[0018] Figure 1A schematic sectional view shows a fragment of a circuit carrier and an exemplary embodiment of a current measuring arrangement according to the invention for detecting a current in a current conductor,

[0019] Figure 2 Shows Figure 1 A schematic top view of a current measuring assembly according to the invention,

[0020] Figure 3 Shown for installation Figure 1 and Figure 2 A schematic flow chart of an embodiment of the method according to the invention of a current measuring assembly,

[0021] Figure 4 Shown is the method for executing Figure 3 The installation method according to the present invention Figure 1 and Figure 2 Schematic cross-sectional view of provided components of a current measuring assembly according to the invention. DETAILED DESCRIPTION

[0022] As from Figure 1 , 2 As can be seen in Figures 4 and 5, the illustrated embodiment of the current measuring assembly 10 according to the invention for detecting a current in at least one current conductor 1 comprises a flux conductor assembly 20, which comprises at least one flux conductor 24 at least partially surrounding the at least one current conductor 1, and at least one magnetic field sensor 12, which is arranged on the circuit carrier 3 in the air gap LS of the at least one flux conductor 24 and detects magnetic field lines of a magnetic field in the at least one flux conductor 24 caused by the current flow in the at least one current conductor 1. In this case, the flux conductor assembly 20 with the at least one flux conductor 24 is embodied in multiple parts with a base body 20A, which is connected to the circuit carrier 3 and forms at least one receiving space 22 for the at least one current conductor 1, and a cover 20B, which is connected to the base body 20A and covers the at least one receiving space 22 for the at least one current conductor 1.

[0023] In the exemplary embodiment shown, the current measuring component 10 comprises only a magnetic field sensor 12 designed as a Hall sensor, which is arranged on the upper side of the circuit carrier 3. A magnetic flux conductor component 20 with a magnetic flux conductor 24 is arranged on the lower side of the circuit carrier. In this case, the current conductor 1 is arranged parallel to the magnetic field sensor 12 in a receiving space 22, which is formed by a base body 20A of the magnetic flux conductor component 20 and is covered by a cover 20B of the magnetic flux conductor component 20.

[0024] As from Figure 1 , 2As can also be seen in Figures 4, the base body 20A of the multi-part flux conductor assembly 20 comprises two mutually parallel magnetically conductive side parts 24A of the flux conductor 24 for forming a receiving space 22 for the current conductor 1, which are each at least partially covered by an electrically insulating sheath 26 and are connected to each other via an electrically insulating connecting plate 27. In the illustrated embodiment of the base body 20A, the ends of the two magnetically conductive side parts 24A facing the circuit carrier 3 are not covered by the sheath 26. The ends of the two magnetically conductive side parts 24A facing away from the circuit carrier 3 are each covered by the sheath 26. In this case, the electrically insulating connecting plate 27 and the sheaths 26 of the two magnetically conductive side parts 24A are produced in a common plastic injection molding process.

[0025] The cover 20B of the multi-piece flux conductor assembly 20 comprises a magnetically conductive bottom part 24B of at least one corresponding flux conductor 24 for covering the receiving space 22 for the current conductor 1, which is at least partially covered by an electrically insulating sheath 26. In the embodiment shown, the magnetically conductive bottom part 24B is completely covered by the sheath 26. In the embodiment shown, the flux conductor 24 has a U-shape in order to form an air gap LS, in which the magnetic field sensor 12 is arranged. In an alternative embodiment not shown, the flux conductor 24 has a C-shape.

[0026] Especially from Figure 1 As can also be seen in the figure, the cover 20B is connected to the base 20A so that the magnetically conductive bottom part 24B extends perpendicularly to the two magnetically conductive side parts 24A arranged in parallel and at least partially covers these magnetically conductive side parts, so that the magnetically conductive bottom part 24B and the two magnetically conductive side parts 24A form a magnetic flux conductor 24 with an air gap LS. In the embodiment shown, in order to connect the cover 20B to the base 20A, a first fixing element 29 designed as a locking element is formed on the cover 20B, which interacts with a matching second fixing element of the base 20A, and the second fixing element is introduced into the jacket 26 of the magnetically conductive side part 24A as a locking recess. The electrically insulating connecting plate 27 of the base 20A extends parallel to the first side, here on the bottom side of the circuit carrier 3, and extends perpendicularly to the two magnetically conductive side parts 24A arranged parallel to each other and is connected to the circuit carrier 3. In the illustrated embodiment, in order to connect the base body 20A to the circuit carrier 3, a first fixing element 28 implemented as a press-in pin is formed on the connecting plate 27, and the first fixing element interacts with a second fixing element implemented as a fixing opening 3.2 of the circuit carrier 3. Of course, other suitable fixing elements can also be used to connect the base body 20A to the circuit carrier 3 and to connect the cover 20B to the base body 20A.

[0027] As from Figure 1 and Figure 2As can also be seen, the free, uncovered ends of the magnetically conductive side parts 24A protrude from the electrically insulating connecting plate 27 in the direction of the circuit carrier 3 and respectively pass through an introduction opening 3.1 introduced into the circuit carrier 3. In the illustrated embodiment, the introduction opening 3.1 is introduced into the circuit carrier as a gap. Since the free, uncovered ends of the two magnetically conductive side parts 24A protrude beyond the upper side of the circuit carrier 3, an air gap LS of the magnetic flux conductor 24 is formed on the upper side of the circuit carrier 3 between the two magnetically conductive side parts 24A, in which the magnetic field sensor 12 is arranged.

[0028] In the illustrated embodiment of the current measuring assembly 10, the current conductor 1 is arranged in the receiving space 22 without being connected to the base body 20A or the cover 20B of the magnetic flux conductor assembly 20. In an alternative, not illustrated, embodiment of the current measuring assembly 10, the current conductor 1 is connected to the base body 20A or the cover 20B of the magnetic flux conductor assembly 20. Furthermore, the cover 20B may be connected to a housing part of the current measuring assembly 10 that is not illustrated.

[0029] In a further, not shown, embodiment of the current measuring assembly 10, the base body 20A of the multi-part flux conductor assembly 20 comprises two parallel, magnetically conductive side parts 24A of a corresponding flux conductor 24, for forming a plurality of receiving spaces 22 for a plurality of current conductors 1, the magnetically conductive side parts being at least partially covered by an electrically insulating sheath 26 and connected to one another via electrically insulating connecting plates 27. The cover 20B of the multi-part flux conductor assembly 20 comprises, for each of the plurality of receiving spaces 22 for a plurality of current conductors 1, at least one magnetically conductive bottom part 24B of a corresponding flux conductor 24, which is at least partially covered by an electrically insulating sheath 26. For current measurement in three current conductors 1 of a three-phase drive, three receiving spaces 22 are arranged side by side, each containing a flux conductor 24. Thus, three magnetic field sensors 12 are arranged on the circuit carrier 3 at a distance from one another, which magnetic field sensors each detect magnetic field lines of a magnetic field in a corresponding flux conductor 24 caused by the current flow through the current conductor 1. Each accommodating space 22 includes two magnetic conductive side portions 24A and a magnetic conductive bottom portion 24B, respectively, for forming a magnetic flux conductor 24. The magnetic conductive side portions 24A arranged side by side of the three accommodating spaces 22 are connected to each other via a common electrically insulating connecting plate 27. The three magnetic conductive bottom portions 24B are arranged in a common cover 20B.

[0030] As from Figure 3 and Figure 4As can also be seen in the figure, the illustrated embodiment of the method 100 according to the invention for mounting a current measuring component 10 according to the invention for detecting a current in at least one current conductor 1 comprises a step S100, in which a circuit carrier 3 equipped with at least one magnetic field sensor 12 and at least one current conductor 1 as well as a multi-part flux conductor component 20 are provided, which comprises a base body 20A and a cover 20B. In this case, at least two magnetically conductive side parts 24A are arranged in the base body 20A and at least one magnetically conductive bottom part 22 is arranged in the cover 20B. In step S110, the base body 20A of the multi-part flux conductor component 20 is connected to the equipped circuit carrier 3. In step S120, at least one current conductor 1 is introduced into at least one receiving space 22 of the base body 20A of the flux conductor component 20, so that the at least one current conductor 1 is arranged between the magnetically conductive side parts 24A. In step S130, the cover 20B of the multi-piece magnetic flux conductor component 20 is connected to the base 20A of the multi-piece magnetic flux conductor component 20, so that the cover 20B covers at least one accommodating space 22 of at least one current conductor 1, and at least one magnetic conductive bottom portion 22 of the cover 20B and at least two magnetic conductive side portions 24A of the base 20A form at least one magnetic flux conductor 24 of the multi-piece magnetic flux conductor component 20.

Claims

1. A current measuring component (10) for detecting a current in at least one current conductor (1), the current measuring component comprising a flux conductor component (20) and at least one magnetic field sensor (12), the flux conductor component comprising at least one flux conductor (24) at least partially surrounding the at least one current conductor (1), the at least one magnetic field sensor being arranged on a circuit carrier (3) in an air gap (LS) of the at least one flux conductor (24) and being implemented for detecting magnetic field lines of a magnetic field in the at least one flux conductor (24) caused by a current flowing in the at least one current conductor (1), wherein the flux conductor component (20) having the at least one flux conductor (24) is implemented in multiple parts with a base body (20A) and a cover (20B), the base body being connected to the circuit carrier (3) and forming at least one receiving space (22) for the at least one current conductor (1), and the cover being connected to the base body (20A) and covering the at least one receiving space (22) for the at least one current conductor (1).

2. The current measuring assembly (10) according to claim 1, characterized in that In order to form the at least one accommodating space (22) for at least one corresponding current conductor (1), the base body (20A) of the multi-piece flux conductor assembly (20) respectively comprises two mutually parallel arranged magnetically conductive side parts (24A) of the at least one corresponding flux conductor (24), the magnetically conductive side parts respectively being at least partially covered by an electrically insulating sheath (26) and connected to each other via an electrically insulating connecting plate (27).

3. The current measuring assembly (10) according to claim 1 or 2, characterized in that: In order to cover the at least one receiving space (22) for at least one corresponding current conductor (1), the cover (20B) of the multi-piece flux conductor assembly (10) respectively comprises a magnetically conductive bottom part (24B) of the at least one corresponding flux conductor (24), which is at least partially covered by an electrically insulating sheath (26).

4. The current measuring assembly (10) according to claims 2 and 3, characterized in that The cover (20B) is connected to the base (20A) so that the magnetic conductive bottom portion (24B) extends perpendicularly to the two parallel arranged magnetic conductive side portions (24A) and at least partially covers the magnetic conductive side portions, so that the magnetic conductive bottom portion (24B) and the two magnetic conductive side portions (24A) form corresponding magnetic flux conductors (24) with an air gap (LS).

5. The current measuring assembly (10) according to any one of claims 1 to 4, characterized in that: In order to form a plurality of accommodating spaces (22) for a plurality of current conductors (1), the base body (20A) of the multi-piece flux conductor assembly (20) comprises two parallel arranged magnetically conductive side parts (24A) of the corresponding flux conductor (24), the magnetically conductive side parts are at least partially covered by an electrically insulating sheath (26) and are connected to each other via an electrically insulating connecting plate (27), wherein the cover (20B) of the multi-piece flux conductor assembly (20) comprises, for each of the plurality of accommodating spaces (22) for the plurality of current conductors (1), a magnetically conductive bottom part (24B) of the at least one corresponding flux conductor (24), the magnetically conductive bottom part being at least partially covered by an electrically insulating sheath (26).

6. The current measuring assembly (10) according to any one of claims 2 to 5, characterized in that: The electrically insulating connecting plate (27) of the base body (20A) extends parallel to the first side surface of the circuit carrier (3) and perpendicular to the two parallel arranged magnetically conductive side surfaces (24A), and is connected to the circuit carrier (3).

7. The current measuring assembly (10) according to claim 6, characterized in that The free, uncovered ends of the magnetically conductive side parts (24A) protrude from the electrically insulating connection plate (27) in the direction of the circuit carrier (3) and respectively pass through introduction openings (3.1) introduced into the circuit carrier (3).

8. The current measuring assembly (10) according to any one of claims 1 to 7, characterized in that The at least one current conductor (1) is connected to the base body (20A) or the cover (20B).

9. The current measuring assembly (10) according to any one of claims 1 to 7, characterized in that The cover (20B) is connected to the housing portion of the current measuring component (10).

10. A method (100) for installing a current measuring assembly (10) for detecting a current in at least one current conductor (1) according to any one of claims 1 to 9, comprising the following steps: A circuit carrier (3) equipped with at least one magnetic field sensor (12) and at least one current conductor (1) and a multi-part magnetic flux conductor assembly (20) are provided, wherein the multi-part magnetic flux conductor assembly comprises a base (20A) and a cover (20B), wherein at least two magnetically conductive side parts (24A) are arranged in the base (20A) and at least one magnetically conductive bottom part (24B) is arranged in the cover (20B); the base (20A) of the multi-part magnetic flux conductor assembly (20) is connected to the equipped circuit carrier (3); the at least one current conductor (1) is introduced into the base (20A) of the magnetic flux conductor assembly (20); At least one accommodating space (22) is provided in the at least one current conductor (1), so that the at least one current conductor (1) is arranged between the magnetically conductive side portions (24A), and a cover (20B) of the multi-piece magnetic flux conductor assembly (20) is connected with the base (20A) of the multi-piece magnetic flux conductor assembly (20), so that the cover (20B) covers the at least one accommodating space (22) of the at least one current conductor (1), and at least one magnetically conductive bottom portion (24B) of the cover (20B) and at least two magnetically conductive side portions (24A) of the base (20A) form at least one magnetic flux conductor (24) of the multi-piece magnetic flux conductor assembly (20).

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