Inverter system

Abstract

Converter system with connector, wherein the connector is provided for connecting the intermediate circuits of converters, wherein the connector has at least two interfaces for connection to busbars (20, 22), wherein the connector has at least one further interface for connection to a cable, wherein the further interface includes an eyelet, wherein the connector comprises a first busbar (24) and a second busbar (23), between which an electrically insulating material is provided as insulating foil (21), wherein the first busbar (24) is screw-connectable at both of its end regions to a busbar (20) of a rectifier, inverter (1) and / or converter, which is connected to the upper intermediate circuit potential, wherein the second busbar (23) is screw-connectable at both of its end regions to a busbar (22) of a rectifier, inverter (1) and / or converter.which is connected to the lower intermediate circuit potential, wherein elongated holes are provided in the end regions of the busbars (20, 22, 23, 24), wherein the longer side of the elongated holes is aligned in the direction of the connection direction of the busbars (20, 22) of the two converters connected via the connector, wherein connecting screws (25) are provided for connecting the busbars (20, 22, 23, 24), which are passed through recesses in the end regions of the busbars (20, 22, 23, 24), wherein the busbars (20, 22) of the rectifier, inverter (1), converter and / or the connector are extended perpendicular to the connection direction by means of an intermediate circuit connector and are provided with a recess so that a connecting screw can be passed through, with which a part encompassing the eyelet can be attached, to which electrical conductors of the round cable can be soldered,wherein a first electrical conductor is connected to the upper intermediate circuit potential of an inverter (1) and a second electrical conductor is connected to the lower intermediate circuit potential of the inverter (1), in particular wherein this inverter (1) has a smaller maximum power output than the inverter (1) comprising busbars (20, 22), wherein the busbars (20, 22, 23, 24) are plate-shaped.

Description

The invention relates to a converter system.Converter systems comprise a mains-fed rectifier, the unipolar output voltage of which is also referred to as intermediate circuit voltage. From this, an inverter is supplied, which supplies an electric motor. In the generator mode, energy is fed from the motor via the inverter into the intermediate circuit. Excess energy of the intermediate circuit is destroyed via a brake resistor or fed back into the network by means of a complicated feed-back.DE 103 39 876 A1 discloses a device for coupling two busbars made of flat strip material as the closest prior art.US 2001 / 0039133 A1 discloses an electrical power distribution system.DE 297 19 226 U1 discloses a busbar for connecting two electrical modules.DE 15 63 270 B2 discloses a semiconductor power converter.A switching circuit is known from DE 102 26 387 A1.DE 101 53 748 A1 discloses a converter unit of modular construction.DE 38 02 593 A1 discloses a converter with a DC link.U.S. Pat. No. 3,189,680 A discloses a busbar bus.DE 70 31 014 U discloses a separator for busbars.U.S. Pat. No. 3,476,871 A discloses laminated electrical busbars.DE 88 13 533 U1 discloses an insulated busbar package.A busbar package is known from DE 93 03 886 U1.A connecting device is known from DE 196 22 895 A1.The invention is therefore based on the object of developing a converter system, wherein the environmental protection is to be improved.According to the invention, the object is achieved in the converter system according to the features specified in claim 1.This has the advantage that environmental protection is improved. This is because, by means of the connection, i.e. parallel connection, of intermediate circuits of a plurality of converters, energy fed into the intermediate circuit, for example, during motor operation of an electric motor can be consumed by another electric motor supplied from the intermediate circuit via inverters. This is because the busbars of a first converter can be connected to at least busbars of the intermediate circuit of a further converter. Further busbars can be connected by means of further connectors and therefore further converters, so that an energy compensation between the converters is made possible. In this way, costly and thus environmentally polluting regenerations during production and disposal or, during their operation, environmentally polluting braking resistances can be avoided because of the energy dissipation.According to the invention, elongated holes are provided in the end regions of the busbars. It is advantageous here that a length compensation is conceivable. If the position of the converters to be connected thus deviates somewhat from the planned position, a compensation of this desired-actual deviation is made possible.According to the invention, the longer side of the slots is oriented in the direction of the connection direction of the busbars of the two converters connected via the connector. It is advantageous here that the compensationable tolerance is provided in the connecting direction.According to the invention, connecting screws are provided for connecting the busbars, which are passed through the recesses in the end regions of the busbars. It is advantageous here that these connecting screws can be guided through holes in the normal direction of the plate-shaped busbars and an electrically conductive and mechanically load-bearing connection can thus be produced.According to the invention, the busbars of the rectifiers, inverters, converters and / or of the connector are extended perpendicular to the connection direction by means of intermediate circuit connectors and provided with a recess, so that a connection screw can be passed through, with which a part comprising an eyelet can be fastened, to which electrical lines of the round cable can be soldered. It is advantageous here that not only converters having busbars in the intermediate circuit, but also converters of smaller sizes, i.e. with smaller output power, can be connected, the electrical intermediate circuit connection of which can be implemented by means of flexible cables, in particular stranded cables or round cables.According to the invention, a first electrical line is connected to the upper intermediate circuit potential of an inverter and a second electrical line is connected to the lower intermediate circuit potential of the inverter, in particular wherein this inverter has a smaller maximum power that can be generated than the inverter comprising busbars. It is advantageous here that converters of different power classes, i.e. construction sizes, can be connected.According to the invention, the busbars are designed to be plate-shaped. It is advantageous here that high current intensities can be conducted through, wherein a high mechanical strength can be achieved.Important features in the converter system with connectors are that the connector is provided for connecting the intermediate circuits of converters.It is advantageous here that connectors of different sizes can be coupled to one another via their intermediate circuit and thus an energy exchange between motor and generator drives is made possible via the intermediate circuit. Smaller drives can also be coupled to larger ones, so that different line guiding techniques, such as busbars, i.e. rigid structures, and power cables, i.e. more elastic structures than busbars, can be connected. This connection is achieved by means of the connector and its execution.According to the invention, the connector is constructed in the manner described above.According to the invention, the connector has at least two interfaces for connection to busbars. It is advantageous here that converters having busbars can be coupled, that is to say rigid power lines.According to the invention, the connector has at least one further interface for connection to a cable, in particular wherein the further interface comprises an eyelet. It is advantageous here that a converter with a more flexible, elastically deformable power line can be used in contrast to busbars.Further advantages are evident from the dependent claims.The invention will now be explained in more detail with reference to the drawings:FIG. 1 shows a converter of a converter system according to the invention.FIG. 2 shows an intermediate circuit connector for connecting the intermediate circuits of inverters 1 and / or converters.In the converter system, intermediate circuits of different sizes can be connected to one another. In this case, the intermediate circuit comprises an upper and a lower intermediate circuit potential, wherein the unipolar voltage prevailing between these potentials, in particular DC voltage, can be used to supply an inverter stage comprising respective half bridges of drivable power semiconductors, which inverter stage is provided for generating one or polyphase AC voltage from which an electric motor can be supplied.The unipolar voltage is generated in motor operation from a mains-fed rectifier. During the generator operation of the motor, energy is conducted from this energy to the intermediate circuit.By means of the connection of the intermediate circuits of different converters, energy compensation is now made possible. In this case, in the case of first converters, the intermediate circuit is realized by means of busbars.Second converters, which belong to a smaller structural size and can thus provide a lower maximum output power that can be generated, likewise have an intermediate circuit to which further converters can be connected. However, no busbars but simple round cables are used here for the upper and likewise for the lower intermediate circuit potential.For connecting the intermediate circuits of the first converters, a connector is thus provided, which has a busbar for the upper and lower intermediate circuit potentials. Each of these busbars can thus be connected, in particular screw-connectable to connecting screws 25, to corresponding busbars which are provided in the first converter and protrude at the recess 2. Between the busbars (23, 24), an insulating film 21 is provided, which increases the electrical insulating distance and thus the critical voltage value, at the crossing of which breakdown occurs.The further first converter to be connected in turn has the same recess 2 at which the connector can be connected by means of its busbars.For the passage of the connecting screws 25, elongated holes are provided in the busbars ( 20, 22, 23, 24), in particular elongated holes whose longer side is provided in the direction of the connecting direction defined by the connector. In this way, a length compensation is made possible.In FIG. 20, the busbars (20, 22) have a bend in order to form a plane when connected to the busbars (23, 24) as seen from the outside.In further exemplary embodiments according to the invention, the busbars ( 20, 22) do not have a bend, but are of planar design. The busbars (23, 24) of the connector are then preferably provided with a corresponding bend in order to form a plane again.For connection to the round cables of the further second converters, the busbars ( 20, 22) are extended perpendicularly to the connection direction by means of intermediate circuit connectors and are provided with a recess, so that a connecting screw can be passed through, with which an eyelet can be fastened, to which the electrical lines of the round cable can be soldered.Converters of smaller sizes can thus be provided in a simple manner below the converters with busbars, that is to say the converters of larger size.In FIG. 3, a connecting part 30, which can also be designated as a connecting block, is shown as an eyelet. The electrical lines of the round cable are soldered to this cable. It is advantageous here that the eyelet is configured downwards, i.e. not in the direction of the connector, but perpendicular to the direction of the connector, i.e. perpendicular to the connection direction of the converters and / or perpendicular to the direction of the busbars of the first converters.In further exemplary embodiments according to the invention, the connector is designed with a section of insulating film in such a way that it represents a unit that can be stored on its own.List of reference characters1 Inverter 2 Recess in the housing of the inverter 1 20 Busbar for upper intermediate circuit potential 21 Insulating film 22 Busbar for lower intermediate circuit potential 23 Rail piece with elongated holes 24 Rail piece with elongated holes 25 Connecting screws 30 Connecting part

Claims

Converter system with connector, wherein the connector is provided for connecting the intermediate circuits of converters, wherein the connector has at least two interfaces for connecting to busbars (20, 22), wherein the connector has at least one further interface for connecting to a cable, wherein the further interface comprises an eyelet, wherein the connector comprises a first busbar (24) and a second busbar (23), between which an electrically insulating material is provided as an insulating film (21), wherein the first busbar (24) can be respectively screw-connected at its two end regions to a busbar (20) of a rectifier, inverter (1) and / or converter which is connected to an upper intermediate circuit potential, wherein the second busbar (23) can be respectively screw-connected at its two end regions to a busbar (22) of a rectifier, inverter (1) and / or converter, which is connected to a lower intermediate circuit potential, wherein elongated holes are provided in the end regions of the busbars (20, 22, 23, 24), wherein the longer side of the elongated holes is oriented in the direction of the connection direction of the busbars (20, 22) of the two converters connected via the connector, wherein connecting screws (25) are provided for connecting the busbars (20, 22, 23, 24), which are led through recesses in the end regions of the busbars (20, 22, 23, 24), wherein the busbars (20, 22) of the rectifiers, inverter (1), converters and / or of the connector are designed elongated perpendicular to the connection direction by means of intermediate circuit connectors and are provided with a recess, such that a connecting screw can be led through, with which a part comprising the eyelet can be fastened, to which electrical lines of the round cable can be soldered connected, wherein a first electrical line is connected to the upper intermediate circuit potential of an inverter (1) and a second electrical line is connected to the lower intermediate circuit potential of the inverter (1), in particular wherein this inverter (1) has a smaller maximum power that can be generated than the inverter (1) comprising busbars (20, 22), wherein the busbars (20, 22, 23, 24) are designed in the form of plates.

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