ELECTRICAL APPLIANCE, IN PARTICULAR INVERTERS OR CONVERTERS

Description

[0001] The invention relates to an electrical device, in particular an inverter or converter.

[0002] It is generally known that electrical connectors have contact pins that must be inserted into corresponding connection devices when connecting.

[0003] From the US 2014 / 098498 A1 The closest state of the art is an electrical device.

[0004] From the DE 10 2015 202197 A1 a frequency converter is known.

[0005] The invention is therefore based on the object of ensuring a secure connection.

[0006] According to the invention, the object is achieved in the electrical device according to the features specified in claim 1.

[0007] Important features of the invention in the electrical device, in particular inverter or converter, are that the electrical device has a first and a second circuit board, wherein the first circuit board has protruding tab regions, wherein a respective tab region protrudes into a respective recess of the second circuit board, wherein contact pins, in particular of one or more connector parts, protrude into holes of the second circuit board.

[0008] The advantage here is that the tab areas act as guides when the contact pins are inserted into the holes. In addition, mechanical protection for the contact pins can be achieved by means of the tab areas because they protrude further from the first circuit board than the contact pins and thus protect them when placed on the second circuit board. The contact pins can only reach the second circuit board if the tab areas are countersunk into the recesses. In addition, reverse polarity protection is easy to implement by ensuring that the at least three tab areas arranged in a line are irregularly spaced from one another. This means that even if the first circuit board is rotated by 180°, all of the tab areas cannot be countersunk, especially if all of the tab areas are shaped identically, i.e. each tab area would fit into every recess.Because of the different distances, the plug connection can only be carried out in the intended manner.

[0009] In an advantageous embodiment, the first and second circuit boards are connected to a heat sink of the electrical device. Advantageously, a power module can be mounted on the first circuit board. This power module has at least one controllable semiconductor switch and generates heat during operation, and is thermally connected to the heat sink.

[0010] In an advantageous embodiment, the holes are plated through, and the respective contact pins are soldered and / or plugged into the respective holes. The advantage here is that implementing the plug-in connection requires minimal effort, since only contact pins are required on the first circuit board and holes in the second circuit board. The tab areas, together with the recesses, provide a pre-guiding feature, meaning no additional mechanical protection for the contact pins is necessary.

[0011] In an advantageous embodiment, the first circuit board is aligned perpendicularly to the second circuit board, in particular wherein the first circuit board is arranged in a first plane, in particular the circuit board plane, and the second circuit board, in particular the circuit board plane, is arranged in a second plane, wherein the first plane is aligned perpendicularly to the second plane. It is advantageous that the tab regions of the first circuit board can be inserted into recesses in the second circuit board.

[0012] In an advantageous embodiment, the first circuit board with its tab regions is manufactured by milling and / or breaking out material from a substantially rectangular circuit board. This is advantageous in that the tab regions are easy to manufacture and have a rectangular cross-section that conforms to the straight edge regions of one of the recesses.

[0013] In an advantageous embodiment, the first printed circuit board with its tab areas is formed integrally, in particular as a single piece. This is advantageous because no additional parts are required to form the pre-hole, which is created by the tab areas.

[0014] In an advantageous embodiment, the second circuit board with its tab areas is manufactured by milling and / or breaking out material from a substantially rectangular circuit board. This allows for simple, cost-effective production.

[0015] In an advantageous embodiment, the second circuit board with its tab areas is formed in one piece, particularly in a single piece. This is advantageous because no additional parts are required; the tab areas can be formed simply by machining.

[0016] In an advantageous embodiment, the cross-section of the respective recess lying in the circuit board plane of the second circuit board has four straight edge sections which are connected via semicircular edge sections, in particular wherein a first edge section is aligned parallel to a second edge section and wherein a third edge section is aligned parallel to a fourth edge section and wherein the first edge section is aligned perpendicular to the third edge section, in particular wherein the first edge section is connected to the third edge section via a first semicircular edge section, in particular wherein the third edge section is connected to the second edge section via a second semicircular edge section, in particular wherein the second edge section is connected to the fourth edge section via a third semicircular edge section, in particular wherein the fourth edge section is connected to the first edge section via a fourth semicircular edge section.The advantage here is that the four straight edge sections can be easily produced with a drill or milling cutter, creating the semicircular edge sections in the process. Thus, the semicircular edge sections reduce the stress concentration and space the straight edge sections apart. The tab area rests against the four straight edge sections with little or no play, providing guidance when inserting the contact pins.

[0017] In an advantageous embodiment, the respective tab area is rectangular. Advantageously, the cross-section of the tab area is rectangular in a plane whose normal direction is aligned parallel to the plug connection direction, and thus is guided along the four straight edge areas of the respective recess.

[0018] In an advantageous embodiment, first contact pins between the first and middle tab areas form a first connector, and second contact pins between the middle and third tab areas form a second connector. This is advantageous because the distances between the respective tab areas can be unevenly spaced, especially when the connector parts are of equal length. This prevents polarity reversal or a twisted connection between the two circuit boards.

[0019] In an advantageous embodiment, the tab areas are aligned with one another, in particular spaced apart along a first straight line. This is advantageous because the tab areas can be easily inserted into the recesses.

[0020] In an advantageous embodiment, the contact pins are arranged along a second straight line, wherein the second line is parallel or identical to the first straight line. This advantageously allows a single plug-in direction, in particular the same plug-in direction, to be effective for the tab areas and the contact pins.

[0021] In an advantageous embodiment, the tab areas of the first circuit board are arranged in the plane of the first circuit board. This is advantageous because the first circuit board, including its tab areas, can be milled out of an original circuit board.

[0022] In an advantageous embodiment, the first circuit board and the second circuit board are each rigid, i.e., not flexible. This is advantageous in that plugging the two circuit boards together is easy. In contrast, with a flexible circuit board, i.e., a foil-like circuit board, no significant force can be transmitted from one edge area to the edge area of ​​the first circuit board containing the contact pins, and therefore the plug connection cannot be easily established.

[0023] In an advantageous embodiment, one of the recesses is plated through and the tab area projecting into this recess has a metallically conductive area on its outer surface, in particular a conductor track, In particular, the plated-through recess and / or the metallic region is connected to the reference potential, in particular electrically to ground, in particular, the metallically conductive region being arranged both on the top and bottom of this tab region. The advantage here is that a secure ground connection is achieved before other electrical connections are established through the contact pins with the plated-through holes, in particular.

[0024] In an advantageous embodiment, the tab areas protrude further from the first circuit board than the contact pins, in particular such that the tab areas projecting into the recesses provide a guide when inserting the contact pins into the holes. This provides mechanical protection for the contact pins.

[0025] In an advantageous embodiment, the tab areas protrude further in the direction of the normal to the plane receiving the second circuit board than the contact pins on the first circuit board, in particular in such a way that the tab areas protruding into the recesses provide a guide when inserting the contact pins into the holes. The advantage here is that advance guidance is possible. This is because in this way it is possible for the tab areas to initially protrude into the recesses when the first and second circuit boards are plugged in and, thanks to the straight edge sections, the tab areas, which are rectangular in cross-section, to each bear against it with little or no play, so that guidance is achieved during further plug-in connections, which enables the contact pins to be securely threaded into the holes of the second circuit board.

[0026] In an advantageous embodiment, the tab areas each have a chamfer, in particular a centering chamfer. This has the advantage of facilitating threading of the tab areas.

[0027] In an advantageous embodiment, at least one of the holes is plated through and connected to the electrical reference potential, in particular electrical ground. This is advantageous because, when connecting the first and second circuit boards, a ground connection is initially established, thus preventing the occurrence of overvoltage.

[0028] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0029] The invention will now be explained in more detail using schematic illustrations: In the Figure 1 a circuit board arrangement of an electrical device according to the invention is shown in an oblique view before a first circuit board 3 is connected to a second circuit board 4. In the Figure 2 The circuit board arrangement is shown in an oblique view after the two circuit boards are connected as a circuit board arrangement. Figure 3 The circuit board layout is shown in plan view. Figure 4 a schematic section through a partial area of ​​the connection area between the first circuit board 3 and the second circuit board 4 is shown.

[0030] As shown in the figures, a first circuit board 3 is attached to a heat sink 1 of the electrical device, in particular by means of screws.

[0031] In addition, a power module 2 is mounted on the first circuit board 3, which is connected to the heat sink 1 in a heat-conducting manner and is preferably pressed onto the heat sink 2 by a screw, in particular the screw head, which is screwed into a threaded hole in the heat sink.

[0032] A second circuit board 4 has three or more recesses 6 which are unevenly spaced from one another and arranged one behind the other in a straight line.

[0033] Parallel to this, holes 7 are arranged on the second circuit board 7, with contact pins 8 being insertable into the holes 7. These contact pins 8 are held together as a connector part with which the first circuit board 3 is equipped.

[0034] To prevent jamming when inserting the contact pins 8 into the holes 7, protruding tab areas 5 are formed on the first circuit board 3. These are created by milling away material from the first circuit board 3.

[0035] The tab areas 5, which are preferably narrower than the connector parts, protrude further on the first circuit board 3 than the contact pins 8.

[0036] As a result, the tab areas 5 comprising the base material of the first circuit board 3 first come into contact with the second circuit board 4 and are inserted into the recesses 6. Only then do the contact pins 8 penetrate into the holes 7. However, during this penetration of the contact pins 8, a guide is already effective, which is effective by means of the tab areas 5 already located in the recesses 6.

[0037] This is because the recesses 6 each have at least partially a border which lies flatly or at least linearly against the tab area 5.

[0038] As in Figure 4 As shown, the respective tab area 5 has a rectangular cross-section. The cross-section of the recess 6, however, also has four straight edge sections, but these are connected by semicircular edge sections.

[0039] The tab areas 5 are each essentially cuboid-shaped. The recesses 6 can be created with a tool, such as a drill or milling cutter, whose axis of rotation is aligned parallel to the normal of the circuit board plane of the second circuit board 4. This is because the milling cutter only needs to be moved along a straight line to create the recesses 6. Figure 4 upper horizontal line, and then perpendicular to it to create the Figure 4 left vertical line, creating the two semicircles on the left half of the image. The tool can then be moved vertically again to create the Figure 4 lower horizontal line, and then perpendicular to it again to create the Figure 4 to create a vertical line.

[0040] The tab area 5 already rests against the four straight edge areas while the contact pins 8 are threaded in. Thus, the threading is guided by the tab areas 5 and prevents the connector part from becoming jammed.

[0041] The irregular spacing of the tab areas 5 from each other prevents twisted assembly of the circuit boards 3 and 4.

[0042] As in Figure 3 As can be seen, the distance from the first tab area 5 to the middle tab area is smaller than the distance from the last tab area 5 to the middle tab area 5. Thus, a connection of the two circuit boards (3, 4) is not possible when the first circuit board 3 is rotated by 180°, since the three tab areas 5 cannot be inserted into the recesses.

[0043] The protruding tab areas 5 also provide protection for the contact pins 8 during transport or the like.

[0044] The contact pins 8 of the first connector part are arranged between the first tab area 5 and the middle tab area 5.

[0045] The contact pins 8 of the second connector part are arranged between the third tab area 5 and the middle tab area 5.

[0046] By making one of the recesses and / or one of the holes through-plated, it is possible, when plugging together the two circuit boards 3 and 4, to first transfer the reference potential and only then to close the other electrical connections, in particular between the contact pins and further through-platings of the holes.

[0047] Printed circuit boards 3 and 4 are designed to be rigid, i.e., not flexible and bendable. The base material of printed circuit boards 3 and 4 preferably comprises an epoxy resin. Printed circuit boards 3 and 4 are considered here as plate-shaped, quasi-two-dimensional parts. Thus, each of printed circuit boards 3 and 4 is arranged in a respective printed circuit board plane. The directions of the two normals of the printed circuit board planes are aligned perpendicular to each other.

[0048] In further embodiments according to the invention, the tab region is formed with a conductor track that is connected to the reference potential, in particular electrical ground. In addition, the recess 6 is then plated through, so that grounding is established when the recess 6 is touched by the tab region 5. Alternatively or additionally, at least one of the holes can also be plated through, which is connected to the reference potential, in particular electrical ground. This ensures that the connection to the reference potential can be established directly when threading the contact pins 8. List of reference symbols

[0049] 1 Heat sink 2 Power module 3 First circuit board 4 Second circuit board 5 Tab area 6 Recess 7 Hole 8 Contact pin

Claims

1. Electrical device, in particular an inverter or a converter, wherein the electrical device comprises a first and a second printed circuit board (3, 4), wherein the first printed circuit board (3) comprises protruding tab regions (5), wherein a respective tab region (5) protrudes into a respective cutout (6) in the second printed circuit board (4), wherein contact pins (8), in particular one or more plug-in connector parts, mounted in the first printed circuit board (3) protrude into holes in the second printed circuit board (4), characterized in that the cross-section of the respective cutout (6), which cross-section is located in the printed circuit board plane of the second printed circuit board (4), has four straight edge portions which are connected via semicircular edge portions.

2. Electrical device according to claim 1, characterized in that the first and the second printed circuit board (3, 4) are connected to a heat sink (1) of the electrical device.

3. Electrical device according to any one of the preceding claims, characterized in that the holes are plated through and the respective contact pins (8) are connected to the respective holes by way of soldering and / or are connected to the respective holes by way of a plug-in connection.

4. Electrical device according to any one of the preceding claims, characterized in that the first printed circuit board (3) is oriented perpendicular to the second printed circuit board (4), in particular wherein the first printed circuit board (3) is arranged in a first plane, in particular printed circuit board plane, and the second printed circuit board (4) is arranged in a second plane, in particular printed circuit board plane, the first plane being oriented perpendicular to the second plane.

5. Electrical device according to any one of the preceding claims, characterized in that the first printed circuit board (3) is produced with its tab regions (5) by milling out and / or breaking out material from a substantially rectangular printed circuit board, and / or in that the first printed circuit board (3) is formed integrally, in particular in one piece, with its tab regions (5).

6. Electrical device according to any one of the preceding claims, characterized in that the second printed circuit board (4) is produced with its tab regions (5) by milling out and / or breaking out material from a substantially rectangular printed circuit board, and / or in that the second printed circuit board (4) is formed integrally, in particular in one piece, with its tab regions (5).

7. Electrical device according to any one of the preceding claims, characterized in that a first edge portion is oriented parallel to a second edge portion, and wherein a third edge portion is oriented parallel to a fourth edge portion, and wherein the first edge portion is oriented perpendicular to the third edge portion, in particular wherein the first edge portion is connected to the third edge portion via a first semicircular edge portion, in particular wherein the third edge portion is connected to the second edge portion via a second semicircular edge portion, in particular wherein the second edge portion is connected to the fourth edge portion via a third semicircular edge portion, in particular wherein the fourth edge portion is connected to the first edge portion via a fourth semicircular edge portion.

8. Electrical device according to any one of the preceding claims, characterized in that the respective tab region is rectangular.

9. Electrical device according to any one of the preceding claims, characterized in that first contact pins (8) between the first and the middle tab region form a first plug-in connector, and second contact pins (8) between the middle and the third tab region (5) form a second plug-in connector.

10. Electrical device according to any one of the preceding claims, characterized in that the tab regions (5) are in alignment with one another, i.e. in particular are arranged at a distance from one another along a first straight line.

11. Electrical device according to any one of the preceding claims, characterized in that the contact pins (8) are arranged along a second straight line, wherein the second line is parallel to and / or identical to the first straight line.

12. Electrical device according to any one of the preceding claims, characterized in that the tab regions (5) of the first printed circuit board (3) are arranged in the plane of the first printed circuit board (3), and / or in that the first printed circuit board (3) and the second printed circuit board (4) are each rigid, i.e. inflexible.

13. Electrical device according to any one of the preceding claims, characterized in that one of the cutouts is plated through and the tab region (5) protruding into this cutout (6) has a metallically conductive region, in particular a conductor track, on its outer surface, in particular wherein the plated-through cutout (6) and / or the metallic region is connected to the reference potential, in particular to electrical ground, in particular wherein the metallically conductive region is arranged both on the top side and on the bottom side of this tab region.

14. Electrical device according to any one of the preceding claims, characterized in that the tab regions (5) protrude further on the first printed circuit board (3) than the contact pins (8), in particular such that a pre-guide during the insertion of the contact pins (8) into the holes is formed by means of the tab regions (5) protruding into the cutouts, and / or in that the tab regions (5) protrude further in the direction of the normal of the plane containing the second printed circuit board (4) than the contact pins (8) on the first printed circuit board (3), in particular such that a pre-guide during the insertion of the contact pins (8) into the holes is formed by means of the tab regions (5) protruding into the cutouts.

15. Electrical device according to any one of the preceding claims, characterized in that the tab regions (5) each have a chamfer, in particular a centering chamfer, and / or in that at least one of the holes is plated through and is connected to the electrical reference potential, in particular to electrical ground.