electrical appliance

Abstract

Electrical device, in particular inverter, comprising: - a first printed circuit board (9), comprising first conductor tracks and at least one via (2, 3, 4), - a second printed circuit board (11), comprising second conductor tracks and at least one connecting element (10, 14, 16), - a power module (5), - and a connector part (12), characterized in that the power module (5) is mounted on the first printed circuit board (9) and is electrically connected to the via (2, 3, 4) by means of the first conductor tracks, wherein the connector part (12) is mounted on the second printed circuit board (11) and is electrically connected to the connecting element (10, 14, 16) by means of the second conductor tracks, wherein the via (2, 3, 4) is electrically connected to the connecting element (10, 14, 16) by means of a cable (6, 7, 8), wherein on the first The circuit board (9) is equipped with another power module (1) and another connector part (13),wherein the first circuit board (9) has further conductor tracks, wherein the further power module (1) is connected to the further connector part (13) by means of the further conductor tracks, wherein two electric motors can be supplied independently of each other by means of the electrical device, wherein an identical circuit board layout can be used for one electrical device to supply one electric motor and for one electrical device to supply two electric motors.

Description

The invention relates to an electrical device, in particular an inverter. From DE 10 2005 054 601 A1 an electrical device with connectors is known. DE 695 23 374 T2 discloses a modular inverter comprising: a voltage module, which has an input terminal plate for connection to an AC voltage source, an output terminal plate for connection to a motor to be supplied, and a voltage source plate with a socket; and a control substrate with a socket, wherein a flat cable connects the voltage source substrate and the control substrate by means of the respective socket for the transmission of control signals. DE 199 83 152 T5 discloses a power driver device comprising a main circuit board, including an input terminal block, and a converter unit, including an input section, wherein an optional filter module can be arranged between the input terminal block and the input section and can be connected by means of a wire to a receptor terminal housing which is connected to input pins of the converter unit. DE 43 33 387 A1 discloses a power converter with an interchangeable heat sink and a housing that can be connected to the heat sink, wherein a power module is arranged in the housing, and wherein the heat sink and the housing have elements for mutual alignment. US 2008 / 0 280 495 A1 discloses a connector part comprising a cable, a contact pin and a printed circuit board having a via for connecting a conductor of the cable to the contact pin by means of a conductor track of the printed circuit board. DE 10 2005 054 601 A1 discloses an electrical device comprising a housing part, a connector part mounted on a circuit board and a retaining means received in a recess of the housing part, with which the connector part can be plugged in. From DE 10 2005 062 770 A1, a system for protecting an electrical component against an impact is known as the closest prior art. A power driver device is known from DE 199 83 152 T5. From DE 101 08 767 A1 an electronic control unit with flexible wires which connect a connecting element to a printed circuit board is known. The invention is therefore based on the objective of further developing an electrical device, with the aim of improving environmental protection. According to the invention, the problem is solved in the electrical device according to the features specified in claim 1. Key features of the invention in the electrical device, in particular the inverter, comprising: - a first printed circuit board, comprising first conductor tracks and at least one via, - a second printed circuit board, comprising second conductor tracks and at least one connecting means, - a power module, - and a connector part, are that the power module is mounted on the first printed circuit board and is electrically connected to the via by means of the first conductor tracks, wherein the connector part is mounted on the second printed circuit board and is electrically connected to the connecting means by means of the second conductor tracks, wherein the via is electrically connected to the connecting means by means of a cable. An advantage of this design is that the electronic device can be made compact, as the circuit boards can be arranged at a distance from each other. The circuit boards can be spaced apart in the normal direction to a circuit board plane, for example, they can be arranged parallel to each other. The position of the connector on the electrical device can be selected independently of the position of the first circuit board in the electrical device. Advantageously, the second circuit board can be made smaller than the first circuit board. Advantageously, circuit board material can be saved. This improves environmental protection. In a preferred embodiment, one end of the cable is inserted into the via and soldered to it. The advantage here is that the cable can be securely connected to the via in a simple manner. In a preferred embodiment, the connector is mounted on the second circuit board. It is advantageous that the connector protrudes from the plane of the second circuit board, allowing the cable to be plugged onto it. Furthermore, the cable extends transversely to the normal direction of the second circuit board's plane. This prevents cable breakage in a compact electrical device and improves the device's safety. In an advantageous embodiment, the second printed circuit board has a printed circuit board plane, and the connecting element projects from the second printed circuit board perpendicular to the normal direction of the printed circuit board plane. It is advantageous that the connecting element extends further into the interior of the electrical device than the second printed circuit board. Thus, the cable can be positioned at a distance from the second printed circuit board. Advantageously, the cable extends substantially parallel to the normal direction of the printed circuit board plane. In a preferred embodiment, another end of the cable is attached to the connector. The advantage here is that the cable can be securely connected to the connector in a simple manner. Advantageously, the cable can be crimped to the connector, particularly using a crimp connector. In a preferred embodiment, the connecting element is implemented as an additional via in the second printed circuit board. The advantage here is that the additional via can be manufactured in a single operation along with the second conductor track on the second printed circuit board. This reduces the workload and improves environmental protection. In a preferred embodiment, a further end section of the cable is inserted into the connector and soldered to it. The advantage here is that the cable can be securely connected to the connector in a simple manner. According to the invention, a further power module and a further connector component are mounted on the first printed circuit board (PCB). The first PCB has additional conductor tracks, and the further power module is connected to the further connector component by means of these additional conductor tracks. Two electric motors can be powered independently of each other by the electrical device. An identical PCB layout can be used for one electrical device to power one electric motor and for one electrical device to power two electric motors. This allows for a modular inverter system with a reduced number of parts and improves environmental protection. In an advantageous embodiment, the electrical device has a single DC intermediate circuit to which the power module and the other power module are electrically connected, and from which the power modules are supplied. It is advantageous that each power module can supply an electric motor. Advantageously, electrical energy generated by one electric motor can be fed into the other electric motor. Thus, an energy circuit is established, and environmental protection is improved. In a preferred design, the DC link has a single capacitor. The advantage here is that electrical components can be reduced, thus improving environmental protection. In an advantageous embodiment, the electrical device has at least one housing part, wherein the housing part has at least one recess, and the connector part is at least partially guided through the recess. It is advantageous that the connector part can be easily connected to the housing part, in particular by clipping. In an advantageous embodiment, the additional connector part is at least partially guided through the recess or a further recess. It is advantageous that the additional connector part can be easily connected to the housing part, in particular by clipping. In a further advantageous embodiment, the second circuit board is detachably connected to the housing part. The advantage here is that the second circuit board can be easily replaced. In an advantageous embodiment, a retaining element is arranged on the housing part, in particular positively connected to the housing part, especially riveted, wherein the second circuit board is detachably connected to the retaining element, in particular by means of a screw connection. It is advantageous that the second circuit board can be easily connected to the housing part by means of the retaining element. Advantageously, the housing part spans a plane, whereby this plane can be arranged at a non-zero angle to the printed circuit board plane of the second printed circuit board. Advantageously, the connecting element and / or the cable can be spaced apart from the housing part by means of the retaining part. Advantageously, the retaining part can be manufactured as a stamped and bent part, in particular a stamped and bent sheet metal part. In an advantageous embodiment, the second circuit board, in particular a further conductor track of the second circuit board, is electrically connected to the housing part by means of the retaining part and the screw part. It is advantageous that the second circuit board can be grounded via the grounded housing part. In an advantageous embodiment, the housing part has recesses for ventilation, particularly for ventilating the electrical device. It is advantageous that electrical components mounted on the first circuit board can be cooled convectively or by means of a fan. This improves safety. In an advantageous embodiment, the housing part is designed as a sheet metal part, in particular a stamped and bent sheet metal part, wherein the ventilation openings and the opening and / or the further opening are designed as cutouts in the sheet metal part. An advantage of this is that the housing part can be manufactured in a simple manner. Further advantages arise from the subclaims. Meaningful combinations of claims and / or individual figures, in particular from the problem statement and / or the state of the art, emerge from comparison with the current state of the art. The invention will now be explained in more detail with reference to the illustrations: Fig. 1 shows an electrical device according to the invention in an oblique view. Fig. 2 shows a sectional view of the electrical device according to the invention. Fig. 3 shows a populated circuit board of the electrical device according to the invention. The electrical device according to the invention, preferably a converter, has a first circuit board 9, in particular a printed circuit board made of epoxy resin with metallic conductor tracks, on which a power module 5 and a further power module 1 are mounted. In this context, a populated component is understood to be a component whose wire connections are routed through the respective printed circuit board and soldered to the respective conductor tracks on the respective printed circuit board, or a surface-mounted component (SMD) whose contact pads are soldered directly onto the respective printed circuit board. Each power module (1, 5) includes an inverter, comprehensively controllable semiconductor power switches, in particular IGBTs. The electrical device includes a rectifier mounted on the first circuit board 9 and a DC link powered by this rectifier. Preferably, both power modules (1, 5) are powered by a single common DC link. The power module 5 is connected to the first circuit board 9 via three vias (2, 3, 4) by means of the first conductor tracks. The power module 5 also has electrical contacts that are soldered to the first conductor tracks. The vias (2, 3, 4) are electrically connected to each cable (6, 7, 8). For this purpose, the first end of each cable (6, 7, 8) is inserted into the respective via (2, 3, 4) and soldered to the respective via (2, 3, 4). A second end region of each cable (6, 7, 8) is electrically connected to a respective connector (10, 14, 16). The connectors (10, 14, 16) are arranged, and in particular mounted, on a second printed circuit board 11, in particular a printed circuit board made of epoxy resin with metallic conductor tracks. A connector part 12 is mounted on the second printed circuit board 11. The connectors (10, 14, 16) are electrically connected to the connector part 12 by means of second conductor tracks on the second printed circuit board 11. For this purpose, the connectors (10, 14, 16) and the connector part 12 have electrical contact elements that are soldered to the second conductor tracks. The connecting elements (10, 14, 16) are designed as sheet metal parts with wire connections, which are inserted into recesses in the second printed circuit board 11 and soldered to conductor tracks of the second printed circuit board 11. Preferably, the connecting elements (10, 14, 16) are pluggable to the second printed circuit board 11, so that the connecting elements (10, 14, 16) are held in place on the second printed circuit board 11 when passing through a solder bath or oven for contacting the wire connections. Preferably the connecting means (10, 14, 16) are designed as angle bracket parts that cantilever out from the plane of the printed circuit board and / or extend beyond the second printed circuit board 11. In another embodiment not shown, the connecting means are designed as further vias in the second circuit board, which are electrically connected to the connector part 12, in particular to connecting means of the connector part 12, by means of conductor tracks of the second circuit board 11. The connector part 12 is designed for connection with a mating connector part. The mating connector part is, for example, electrically connected to an electric motor, so that the electric motor can be powered by the electrical device, in particular from the power module 5. The electrical device has at least one housing part 17. The connector part 12 is partially guided through a recess in the housing part 17 and is connected to the housing part 17 and / or the second circuit board 11, in particular by frictional connection, preferably by clamping connection. The second circuit board 11 is detachably connected to the housing part 17. For this purpose, at least one retaining part 20 is connected to the housing part 17, in particular by riveting. The retaining part 20 has at least one bore through which a screw part 15 can be passed. The second circuit board 11 has at least one bore through which the screw part 15 can be passed. By means of the screw part 15, which is passed through the bore and can be secured by a nut, the second circuit board 11 is detachably connected to the retaining part 20. The retaining element 20 is designed as a stamped and bent part, in particular a stamped and bent sheet metal part. The housing part 17 spans a plane. Preferably, the second circuit board 11 is connected to the housing part 17 such that this plane is arranged at a non-zero angle to the circuit board plane of the second circuit board 11; more preferably, the circuit board plane of the second circuit board 11 is arranged at a right angle to the plane of the housing part 17. The retaining elements 20 arranged on the second circuit board 11 are spaced apart from the housing part 17. Fig. 3 shows the assembled circuit board 9 of the electrical device according to the invention. The first circuit board 9 is equipped with the power module 5 and the further power module 1, with current measuring resistors 35 and further current measuring resistors 34, with optocouplers 32 and further optocouplers 33, with a transformer 37 and a further transformer 36 and with a brake control device 30 and a further brake control device 31, wherein the brake control devices (30, 31) each have a transistor. The optocouplers 32 are electrically connected to the transformer 37 via conductor tracks arranged on the first circuit board 9 and are powered by it. The power module 5 is controlled by the optocouplers 32. For this purpose, the optocouplers 32 are electrically connected to the power module 5 via conductor tracks arranged on the first circuit board 9. The current-sensing resistors 35 measure the output current of the power module 5. For this purpose, the current-sensing resistors 35 are electrically connected to the power module 5 via conductor tracks arranged on the first circuit board 9. The electrical device can be used to control a first brake; for this purpose, the electrical device has a brake control device 30. The additional optocouplers 33 are electrically connected to the additional transformer 36 via conductor tracks arranged on the first circuit board 9 and are powered by it. The additional power module 1 is controlled by means of the additional optocouplers 33. For this purpose, the additional optocouplers 33 are electrically connected to the additional power module 1 via conductor tracks arranged on the first circuit board 9. The additional current measuring resistors 34 measure the output current of the additional power module 1. For this purpose, the additional current measuring resistors 34 are electrically connected to the additional power module 1 by means of conductor tracks arranged on the first circuit board 9. A second brake can be controlled by means of the electrical device; for this purpose, the electrical device has a further brake control device 31. Thus, the electrical device is configured to supply and / or control two independent electric motors, each with a brake. The additional power module 1 is electrically connected to another connector part 13 via conductor tracks on the first circuit board 9. The additional connector part 13 is configured to connect to another mating connector part. For example, the mating connector part is electrically connected to another electric motor, so that the additional electric motor can be supplied by the electrical device, in particular from the additional power module 1. Through a further recess in the housing part 17, the further connector part 13 is partially passed through and connected to the housing part 17 and / or the first circuit board 9, in particular by frictional connection, preferably by clamping connection. The housing part 17 has recesses for ventilation 18. The recesses for ventilation 18 are designed for ventilation, in particular for convective cooling, of the electrical device. The housing part 17 is designed as a stamped and bent part, in particular as a stamped and bent sheet metal part. The recess, the further recess and the recesses for ventilation 18 are designed as continuous recesses. Reference symbol list 1 Power module 2 Via 3 Via 4 Via 5 Power module 6 Cable 7 Cable 8 Cable 9 Printed circuit board 10 Connecting element 11 Printed circuit board 12 Connector part 13 Connector part 14 Connecting element 15 Screw part 16 Connecting element 17 Housing part 18 Ventilation recess 20 Retaining element 30 Brake control element, in particular transistor 31 Brake control element, in particular transistor 32 Optocoupler 33 Optocoupler 34 Current-sensing resistor 35 Current-sensing resistor 36 Transformer 37 Transformer

Claims

Electrical device, in particular inverter, comprising: - a first printed circuit board (9), comprising first conductor tracks and at least one via (2, 3, 4), - a second printed circuit board (11), comprising second conductor tracks and at least one connecting element (10, 14, 16), - a power module (5), - and a connector part (12), characterized in that the power module (5) is mounted on the first printed circuit board (9) and is electrically connected to the via (2, 3, 4) by means of the first conductor tracks, wherein the connector part (12) is mounted on the second printed circuit board (11) and is electrically connected to the connecting element (10, 14, 16) by means of the second conductor tracks, wherein the via (2, 3, 4) is electrically connected to the connecting element (10, 14, 16) by means of a cable (6, 7, 8), wherein on the first circuit board (9) is fitted with another power module (1) and another connector part (13),wherein the first circuit board (9) has further conductor tracks, wherein the further power module (1) is connected to the further connector part (13) by means of the further conductor tracks, wherein two electric motors can be supplied independently of each other by means of the electrical device, wherein an identical circuit board layout can be used for one electrical device to supply one electric motor and for one electrical device to supply two electric motors. Electrical device according to claim 1, characterized in that an end region of the cable (6, 7, 8) is inserted into the via (2, 3, 4) and is soldered to the via (2, 3, 4). Electrical device according to one of the preceding claims, characterized in that the connecting means (10, 14, 16) is mounted on the second circuit board (11). Electrical device according to claim 3, characterized in that a further end area of ​​the cable (6, 7, 8) is plugged onto the connecting means (10, 14, 16). Electrical device according to claim 1 or 2, characterized in that the connecting means (10, 14, 16) is designed as a further via in the second circuit board (11). Electrical device according to one of the preceding claims, characterized in that the electrical device has a single DC intermediate circuit to which the power module (5) and the further power module (1) are electrically connected. Electrical device according to one of the preceding claims, characterized in that the electrical device has at least one housing part (17), wherein the housing part (17) has at least one recess, wherein the connector part (12) is at least partially passed through the recess, and / or wherein the further connector part (13) is at least partially passed through the recess or a further recess. Electrical device according to claim 7, characterized in that the second circuit board (11) is detachably connected to the housing part (17). Electrical device according to one of claims 7 or 8, characterized in that a retaining part (20) is arranged on the housing part (17), wherein the second circuit board (11) is detachably connected to the retaining part (20). Electrical device according to claim 9, characterized in that the second circuit board (11) is electrically connected to the housing part (17) by means of the retaining part (20) and the screw part (15). Electrical device according to one of claims 7 to 10, characterized in that the housing part (17) has recesses for ventilation (18). Electrical device according to claim 11, characterized in that the housing part (17) is designed as a sheet metal part, wherein the ventilation recesses (18) and the recess and / or the further recess are designed as punched-out sections in the sheet metal part.

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