Electrical configuration with choke coil

Abstract

An electrical configuration (1) is proposed that includes a circuit board (2) having a plurality of terminal clamps (3) and a choke coil (4) having conductors (5) with stripped terminals (6), each of the stripped terminals (6) being held by one of the plurality of terminal clamps (3).

Description

[Technical field]

[0001] The present invention relates to an electrical configuration including a choke coil and a circuit board, and in particular to an electrical configuration for controlling a traction machine of an electrically drivable vehicle. [Background technology]

[0002] Ring-core chokes are used in filter units of electric vehicles for the electrical attenuation of interference frequencies. Here, a closed geometry is the electrically preferred design. However, the use of closed chokes in the construction of the filter unit requires that the conductor must be inserted through the choke and electrically connected again at the rear. From an electrical point of view, a double passage of the conductor proves to be very advantageous, since the attenuation involves the square of the number of turns. Conducting wires in the choke passages are very difficult to cool and can therefore lead to heating of the choke core. A damping concept with two current passes with simple assembly is needed. Summary of the Invention [Means for solving the problem]

[0003] The invention relates to an electrical arrangement comprising a circuit board and a choke coil with a conductor. The choke coil is arranged on the circuit board in such a way that the stripped terminals of the conductor are accommodated in respective terminal clamps, each of the stripped terminals being held in one of a number of terminal clamps. In other words, the terminal clamps are fixed (for example glued, riveted, soldered) to the circuit board, which has a particularly elastic retention mechanism for the stripped terminals of the choke coil conductor. Here, the terminal clamps may be elastically deflected upon insertion of the stripped terminals and may be cut off after a certain distance through the terminal clamps. In other words, the stripped conductor ends are snapped or engaged into the terminal clamps and are fixed against accidental removal from the terminal clamps. A suitable geometrical form of the terminal clamps can ensure a large contact area with the respective stripped terminals of the conductor. In particular, the surface of the stripped terminals can partially correspond to the terminal clamps in order to ensure a planar abutment of the terminal clamps on the stripped terminals. In particular, the stripped terminals may have an essentially cylindrical conductor shape (e.g. in the manner of copper wires) and the terminal clamps have opposing jaws with cylindrical concave surfaces. In the installed state, the surfaces of the terminal clamps thus form a partial circumferential surface for the stripped terminals. In this way, assembly is simplified compared to the arrangements known in the prior art, and the positioning of the stripped terminals in the terminal clamps is (at least initially) reversible, so that correction of stripped terminals that have been initially installed in the wrong terminal clamps is easily possible.

[0004] The dependent claims indicate preferred developments of the invention. Preferably, the terminal clamps are electrically connected to the respective conductive paths on the circuit board. In other words, the terminal clamps are electrically connected to the respective conductive paths on the circuit board, and electrically connect the choke coil to the periphery surrounding it. The terminal clamps may be, for example, soldered, welded, riveted, or conductively bonded to the conductive paths.

[0005] Preferably, the stripped terminals may be welded to the terminal clamps. In other words, the terminal clamps may be contacted from the outside by one or two electrodes after insertion of the stripped terminals, and when a voltage is applied, a welding current generated by the terminal clamps and the stripped terminals results in a material connection between the terminals and the terminal clamps. In particular, in this connection, welding of the terminal clamps to the circuit board (e.g. with the respective conductive paths) may also be performed. This prevents the choke coil from being mechanically and electrically disconnected from the circuit board.

[0006] For example, the holding clamp and the choke coil may be located entirely on one side of the circuit board. In this configuration, all components of the choke coil (such as the core assembly and electrical conductors) are located on the same side of the circuit board as the terminal clamps. At least, the center of gravity of the choke coil is on the same side of the circuit board as the terminal clamps. Alternatively, the choke coil or its center of gravity may be located on the side of the circuit board opposite the clamps, with only the electrical conductors partially guided to the opposite side of the circuit board and the stripped terminals located on the side of the terminal clamps, with the stripped terminals located within the terminal clamps. This configuration allows the design to remain flat against the respective surface of the circuit board.

[0007] The terminal clamp may have a base with a flat surface (assembly surface) for example for a planar and stable connection with the circuit board. Alternatively or additionally, holding lugs may be provided on both sides of the base, which are curved above the base, for receiving the stripped terminals. In this case, the terminal clamp may be made in one piece (bent) from sheet metal material. Due to the holding lugs being curved above the planar base, a spring deflection for setting a suitable predefined prestress of the holding lugs can be ensured. In this way, the stripped terminals can be held particularly firmly and the contact of the holding lugs by the welding electrode can be preferably and reliably performed next to the stripped terminals.

[0008] In particular, the retaining lugs can have a depth smaller than the depth of the base: in other words, the terminal clamp made from a sheet metal strip has, on the one hand, a sufficiently large width / depth at the location where the planar abutment of the base with the circuit board occurs, and the smaller width / depth of the retaining lugs curving above the base can ensure that the prestress on the stripped terminals is not too great, so that the stripped terminals can be reliably inserted into the terminal clamp without risk to surrounding components.

[0009] The retaining lugs may have distal ends which are oriented in a direction perpendicular to the surface of the circuit board during insertion of the stripped terminals and which first come into contact with the stripped terminals in the course of assembling the choke coil. These distal ends may have a contact surface to the stripped terminals which is essentially perpendicular to the surface of the circuit board. Here, the two opposing distal ends clamp the stripped terminals of the conductors of the choke coil between them. For this, the distal ends may have a gap which tapers in the direction of the surface of the circuit board to facilitate the insertion of the stripped terminals and at the same time ensure a sufficiently large prestress in the final position of the stripped terminals. For this, the distal ends in the region of the final position of the stripped terminals may have a widened distance relative to each other, so that when the stripped terminals are removed in a direction perpendicular to the surface of the circuit board, they necessarily first spread apart again and then spring-narrow again after the stripped terminals have (completely) exited. The distal end is therefore oriented perpendicular to the surface of the circuit board relative to the area of ​​the retention lug adjacent the distal end.

[0010] The choke coil may have a core assembly with a through hole (bore) through which the conductor is threaded. For example, three or four conductors may be threaded through the through hole and returned to the outside of the core assembly. To simplify the accurate and predetermined positioning of the conductor during the assembly of the choke coil, a positioning aid / positioning structure may be provided on the through hole and / or on the front surface of the core assembly and / or on the side surface of the core assembly. The positioning structures may include, for example, webs and / or grooves. They may extend radially on the front surface and / or coaxially with the through hole on the side surface. In particular, if the core assembly has an elastic surface (made, for example, of a suitable plastic), the conductor can be fitted, in particular pressed, into the groove, and the holding force of the positioning structure prevents accidental loosening or (partial) bending back of the conductor towards its initial shape.

[0011] The core assembly may further preferably have a positioning aid mechanism that promotes / facilitates positioning of the choke coil on the circuit board, in particular where a predetermined structure of the core assembly may engage with a corresponding recess in the circuit board, thus enabling positioning of the choke coil relative to the circuit board without twisting.

[0012] In particular, the coding of the rotational position about the longitudinal axis through the through-hole of the choke coil is performed during the assembly process, so that only one rotational position of the choke coil relative to the circuit board is permitted. In this way, an electrically incorrect assignment of the conductors to the terminal clamps can be effectively prevented.

[0013] More preferably, the choke coil or core assembly may have a mechanical stop which cooperates with a corresponding structure of the circuit board (e.g. an edge / flange around the cut-out). In other words, in this way the choke coil can only be inserted into the cut-out to a certain predetermined depth through the circuit board until the stop abuts (particularly planarly) against the surface of the circuit board. This flange surface may be glued to the circuit board. The flange prevents vibrations of the choke coil relative to the circuit board or tilting of the choke coil relative to the circuit board. In particular it can be ensured that the structural height of the choke coil relative to the surface of the circuit board has particularly small tolerances.

[0014] The stripped terminals of the choke coils may be drawn out radially from the coils in a star shape in a common plane. In other words, the stripped terminals are gathered in a common plane parallel to the surface of the circuit board. In this way, the terminal clamps may also have the same design and / or the same height from the surface of the circuit board. In this way, the design of the electrical configuration is further reduced. Here, the stripped terminals or terminal clamps may be arranged in particular equidistant from each other. In other words, the terminal clamps adjacent to each other may each have the same angle with respect to each other. In particular, the stripped terminals may have an angle of 45° with respect to each other.

[0015] The electrical configuration disclosed herein can be prefabricated with simple conductor strips, where the dimensions of the components can be adapted to the current carrying capacity and damping characteristics. Subsequent assembly can be performed on standard carriers (circuit boards, printed circuit boards, pre-molded stamped parts, etc.) with positioning, eliminating threading assembly with intermediate connection processes. In the final assembly, choke coils may be added to the pot structure for cooling and shielding. The component is thus in its own EMC zone, which favors damping.

[0016] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of a choke coil for use in an electrical arrangement according to the present invention; [Diagram 2] 2 is a perspective view of the choke coil shown in FIG. 1 as seen from below. [Diagram 3] 3 shows the configuration shown in FIG. 2 after the conductors guided through the through holes of the coil core have been radially aligned. FIG. [Figure 4] 4 shows a cross-sectional view of the circuit board and the choke coil according to FIG. 3 in relation to the circuit board for assembling the choke coil on both sides. [Diagram 5] FIG. 5 is a perspective view of the components shown in FIG. 4 and additionally shows the placement of stripped conductor ends in terminal clamps. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] 1 shows a choke coil 4 with four electrical conductors 5 with stripped terminals 6 on either side. The conductors 5 are inserted into positioning structures 9 arranged on the front side of a core assembly 8. The positioning structures 9 are configured as paired parallel webs on either side of a radially extending portion of the conductors 5. Two positioning aids 10 are further arranged on the core assembly 8, which engage with cutouts (not shown) in a circuit board (not shown) to prevent twisting of the choke coil 4 relative to the circuit board.

[0019] Figure 2 shows the choke coil 4 shown in Figure 1 upside down. On the opposite front side, positioning structures 9 in the form of webs are also provided for the ends of the conductors 5 which are still coaxially aligned in the configuration shown.

[0020] Figure 3 shows the choke coil 4 shown in Figure 2 after the conductors 5 protruding from the through holes 14 of the core assembly 8 have been bent into the grooves provided by the webs 9, thus radially aligned, with the stripped conductor terminals 6 all now lying in a plane extending perpendicular to an axis passing through the through holes 14 of the core assembly 8.

[0021] FIG. 4 shows a perspective view of the circuit board 2, which has two cutouts 11 corresponding to the protruding positioning aids 10 (FIG. 2). The choke coil, which also has a stopper 16 shown in a cross-sectional view, can therefore only be positioned in one rotational orientation. Furthermore, the cutout 12 has a bay for the part of the conductor 5 that extends outside the core assembly 8. This ensures that the conductor 5 is fixed to the circuit board 2 after insertion of the choke coil 4 into the cutout 12. The joining geometry of the circuit board 2 (the totality of the cutouts 11, 12 and the bay 15) therefore determines the position and alignment of the choke coil 4 in the final position. In the final position, the stopper 16 may be glued with a surface of the circuit board 2. Alternatively, latch lugs may be placed on the core assembly 8, which allow for a (temporary or final) fixation of the choke coil 4 in the circuit board 2.

[0022] FIG. 5 shows the components shown in FIG. 4 after assembly, with the stripped terminals 6 held in the terminal clamps 3. The terminal clamps 3 have respective bases 32 with a first (larger) depth T to which respective retaining lugs 36 are connected at opposite ends. The retaining lugs 36 have distal ends 35 that are essentially perpendicular to the surface of the circuit board 2. The retaining lugs 36 have a depth t that is smaller than the depth T of the bases 32. The retaining lugs 36 are first bent upwards of their respective bases 32, and the distal ends 35 of the retaining lugs 36 are bent upwards in the opposite direction to clamp the stripped terminals 6. The three terminal clamps 3 are connected with the exemplary conductive paths 7 of the circuit board 2. The electrical contact resistance between the stripped terminals 6 and the terminal clamps 3 can be further reduced by placing a welding electrode on the retaining lugs 36 (and / or attaching to the distal ends 35) and a welding current connecting the components together with a material joint.

Claims

1. A circuit board (2) having a plurality of terminal clamps (3); A choke coil (4) having a conductor (5) with a terminal (6) whose coating is removed; An electrical configuration (1) comprising: Each of the stripped terminals (6) is held in one of the terminal clamps (3); In the electrical configuration (1), The choke coil (4) has a core assembly (8) having a through hole (14) through which the conductor (5) is passed, the core assembly (8) has a positioning structure (9), and the conductor (5) is inserted into the positioning structure (9). Electrical configuration (1).

2. The electrical configuration (1) described in claim 1, characterized in that the core assembly (8) has a positioning structure (9) on the front and / or side.

3. The electrical configuration described in claim 1, characterized in that a conductor (5) is pressed into the positioning structure (9).

4. An electrical configuration (1) as described in any one of claims 1 to 3, wherein the core assembly (8) has a protruding positioning assistance mechanism (10) that engages with a corresponding cut-out portion (11) of the circuit board (2).

5. The electrical configuration (1) according to any one of claims 1 to 3, wherein the plurality of terminal clamps (3) are electrically connected to respective conductive paths (7) on the circuit board (2).

6. The electrical arrangement (1) according to any one of claims 1 to 3, wherein the stripped terminals (6) are welded to the terminal clamps (3).

7. The terminal clamp (3) and the choke coil (4) are located entirely on one side of the circuit board (2); or The terminal clamp (3) and the center of gravity of the core assembly (8) of the choke coil (4) are disposed on different sides of the circuit board (2). An electrical arrangement (1) according to any one of the preceding claims.

8. The terminal clamp (3) A planar base (32) that abuts against the circuit board (2), and / or Retaining lugs (36) curved upwardly of the base (32) on opposite sides of the base (32). The electrical arrangement (1) according to any one of claims 1 to 3, having

9. The retaining lug (36) has a depth (t) that is smaller than the depth (T) of said base (32); and / or having a distal end (35) oriented essentially perpendicular to said base (32); 9. Electrical arrangement (1) according to claim 8.

10. The electrical configuration (1) according to any one of claims 1 to 3, wherein the choke coil (4) is guided through a cut-out portion (12) of the circuit board (2) on the side opposite the terminal clamp (3) with respect to the circuit board (2), and the core assembly (8) has a stopper (16) that abuts against the surface of the circuit board (2) on the side of the terminal clamp (3).

11. An electrical arrangement according to any one of claims 1 to 3, wherein the stripped terminals (6) are brought out in a radial star configuration in a common plane.

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