Electrically driven civil engineering machine and method for electrically driving civil engineering machine

Abstract

The invention relates to an electrically driven civil engineering machine. The invention relates to a civil engineering machine having a mobile carrier device, at least one power consumption unit, at least one internal rechargeable battery unit for storing and supplying electrical energy, at least one supply device for supplying electrical energy from an external energy source, and a circuit device for supplying electrical energy to and discharging electrical energy from the at least one power consuming unit as required, the circuit device being configured to distribute electrical energy between the at least one power consuming unit and the supply device by means of an intermediate circuit. According to the invention, it is provided that the circuit arrangement comprises a first intermediate circuit and a second intermediate circuit, and that the first intermediate circuit can be operated at a first voltage level and the second intermediate circuit can be operated at a second voltage level different from the first voltage level.

Description

Technical Field

[0001] The present invention relates to an electrically driven civil engineering machine according to the preamble of claim 1, the civil engineering machine having a mobile load-bearing device, at least one power-consuming unit, at least one internal rechargeable battery unit for storing and supplying electrical energy, at least one supply device for supplying electrical energy from an external energy source, and a circuit device for supplying electrical energy to and releasing electrical energy from the at least one power-consuming unit as needed, wherein the circuit device is configured to distribute electrical energy between the at least one power-consuming unit and the supply device by means of an intermediate circuit.

[0002] The present invention also relates to a method for electrically operating civil engineering machinery according to the preamble of claim 10, the civil engineering machinery having a mobile load-bearing device, at least one power-consuming unit, at least one internal rechargeable battery unit for storing and supplying electrical energy, at least one supply device for supplying electrical energy from an external energy source, and a circuit device for supplying electrical energy to and releasing electrical energy from the at least one power-consuming unit as needed, wherein the circuit device distributes electrical energy between the at least one power-consuming unit and the supply device by means of an intermediate circuit. Background Technology

[0003] Electric-powered civil engineering machinery has been known for a long time and is used particularly in work locations where noise, vibration, and exhaust fumes are undesirable, as these are increasingly found in internal combustion engine-driven civil engineering machinery. Due to the high energy demands of this type of electrically powered civil engineering machinery, it requires a power supply system for drawing electricity from an external power source, particularly the power grid. This necessitates the provision of appropriate cables.

[0004] In addition, electrically driven civil engineering machinery is equipped with rechargeable battery units, which are used in particular to supply sufficient electrical energy to mobile civil engineering machinery during movement or travel, when cable connections are frequently disconnected.

[0005] Storing electrical energy in the internal battery cells also allows for the extraction of additional electrical energy from the internal battery cells to meet the peak energy demands of civil engineering machinery that cannot be fully met by conventional energy supply from the connected external power grid via a supply device.

[0006] For the efficient operation of civil engineering machinery, the most important aspect is controlling and distributing energy to the machinery as needed. EP4245923B1 describes an electrically driven civil engineering machine having an intermediate circuit and a supply device. The intermediate circuit is configured as an electrical conductor to which power-consuming units (particularly battery units and electric motors) are connected. Here, electrical energy can be supplied from the intermediate circuit to the electric motor via an inverter unit, wherein the inverter unit is configured to return energy to the intermediate circuit in the regenerative mode of the electric motor. For efficient energy distribution, the voltage of the intermediate circuit is controlled according to the voltage in the intermediate circuit by means of control components allocated to each power-consuming unit. Summary of the Invention

[0007] The present invention achieves the following objectives: to provide an electrically driven civil engineering machine and a method for operating the civil engineering machine, which enables particularly economical and efficient operation of the civil engineering machine.

[0008] This objective is achieved, on the one hand, by civil engineering machinery having the features of claim 1, and on the other hand, by a method having the features of claim 10. Preferred embodiments are proposed in the corresponding dependent claims.

[0009] The civil engineering machinery according to the invention is configured such that: the circuitry includes a first intermediate circuit and a second intermediate circuit, and the first intermediate circuit can operate at a first voltage level, and the second intermediate circuit can operate at a second voltage level different from the first voltage level.

[0010] The basic idea of ​​this invention is to eliminate a single central intermediate circuit in the onboard power supply system of electrically driven civil engineering machinery. This is achieved by providing a circuit device with two intermediate circuits carrying two different voltage levels. Different power-consuming units for different operating ranges are assigned to different intermediate circuits. Depending on energy and power consumption, the corresponding power-consuming units can be connected to the intermediate circuits as needed, thereby eliminating the need for additional converters. The different voltage levels make the system highly flexible in its overall application. Depending on the operating mode of the construction machinery, the intermediate circuits can be powered in various ways from the local power grid and directly from battery cells using the supply device. This ensures that when the civil engineering machinery is adjusted or moved, certain power-consuming units can also be operated without a power connection to the local power grid.

[0011] A preferred embodiment of the invention provides at least two intermediate circuits. Therefore, it is advantageous that each intermediate circuit has a different voltage level, which is suitable for the operation of certain power-consuming devices, for example, to avoid the need for additional converter units. Particularly advantageous is that the intermediate circuits are redundantly configured to compensate for possible failures. This ensures particularly safe operation.

[0012] In principle, intermediate circuits can be configured as needed. A particularly advantageous embodiment of the invention is implemented such that the intermediate circuits can be operated independently of each other as closed circuits, and at least two intermediate circuits can be connected to the main circuit by means of switching devices, especially disconnecting devices. The switching devices can be configured, in particular, as protective switches for disconnecting and connecting the intermediate circuits. The switching devices can also be configured as converter units for establishing electrical connections. By connecting the two intermediate circuits to the switching devices, electrical energy can be transferred from one intermediate circuit to the other as needed. Particularly advantageously, the first intermediate circuit is connected to the second intermediate circuit via a DC / DC controller, wherein the battery cell is configured to compensate for load peaks. This allows the battery cell to immediately compensate for power peaks that occur during operation. Conversely, when the civil engineering machinery according to the invention operates using a power supply network, excess energy can be fed from the first intermediate circuit to the second intermediate circuit to charge the battery cell. According to a further development of the invention, it is also useful that the first intermediate circuit can be connected to the second intermediate circuit, wherein the first and second intermediate circuits have the same voltage level. Here, the battery cell can be provided to compensate for power peaks.

[0013] The switching device can be equipped with a safety device to disconnect the connection between the first and second intermediate circuits in the event of a sudden power surge. Usefully, the switching device can be controlled by a control unit, allowing, for example, the intermediate circuits to be disconnected or connected via operator input based on the operating status of the civil engineering machinery.

[0014] Another advantageous configuration of the invention is that the intermediate circuit is configured to supply and release electrical energy to and from the battery cells, wherein the battery cells are configured to control the voltage level to compensate for power peaks in the intermediate circuit. By appropriately designing the voltage level of the intermediate circuit, the battery cells can preferably be connected to the intermediate circuit without an additional converter unit. Here, the voltage level of the intermediate circuit can, for example, be between about 400 volts and 800 volts. Therefore, the voltage level is centrally controlled according to the state of charge of the battery cells.

[0015] A particularly useful improvement of the invention is that at least one power-consuming unit includes a DC / DC controller. This allows a large number of peripheral devices (e.g., cooling and heating devices) to be connected to the circuitry in a particularly efficient manner. The DC / DC controller can be configured separately from the power-consuming unit or configured as a unit with the power-consuming unit. It is useful that the DC / DC controller is configured for bidirectional power supply. Particularly advantageously, the DC / DC controller is connected to an onboard low-voltage electrical system, preferably a 12-volt, 24-volt, and / or 48-volt onboard electrical system with at least one intermediate circuit. The DC / DC controller can convert the DC voltage supplied to the input into a DC voltage with a higher, lower, or inverted voltage level. Such a DC controller is particularly a self-controlled current converter.

[0016] According to another embodiment of the invention, it is advantageous that the intermediate circuit is configured to conduct and distribute direct current.

[0017] Another particularly advantageous configuration of the invention is that at least one power-consuming unit is configured as an electric motor, wherein the electric motor is supplied with an inverter unit configured to convert direct current (DC) to alternating current (AC). The inverter unit particularly includes a rectifier or inverter capable of converting current in both directions. In this way, on the one hand, DC power from the intermediate circuit can be supplied to the electric motor as AC power, while on the other hand, electrical energy generated in the regenerative mode of the electric motor can be converted from AC to DC power for delivery to the intermediate circuit.

[0018] A particularly advantageous improvement of the invention is achieved in which a first supply device is configured to supply and convert electrical energy, particularly AC voltage, from a first power supply network having a first voltage, and a second supply device is configured to supply and convert electrical energy, particularly AC voltage, from a second power supply network having a second voltage, which is different from the first voltage. By forming two supply devices, the civil engineering machinery according to the invention can be supplied with electrical energy in a particularly versatile and flexible manner depending on the operating state. The second supply device is preferably configured to charge the battery cells and / or for limited operation of the civil engineering machinery when the first supply device is not supplied with electrical energy. The generally possible operating modes of the civil engineering machinery according to the invention are explained in more detail and by example in the following description of the accompanying drawings.

[0019] Advantageously, the first supply device is configured to supply at least 100 kVA, preferably several 100 kVA units of electrical power. Particularly useful is that the voltage level supplied by the first supply device is greater than or equal to the voltage level supplied by the second supply device. Specifically, a voltage level of 690V AC can be provided for the first supply device. In particular, 400V AC can be provided as the voltage level supplied by the second supply device. It is also particularly useful that the first voltage level supplied by the first supply device corresponds to the second voltage level supplied by the second supply device.

[0020] In principle, both the first and second power supply units can be connected to a first or second power supply network, for example, having 690 volts or 400 volts, and can include at least one converter unit. The converter unit can preferably be configured as a rectifier or converter for converting the AC voltage from the power source. The electrically operated civil engineering machinery can have: a first power supply unit as the primary power source for supplying electrical energy for routine operation; and a second power supply unit as a secondary power source for supplying energy to peripheral power-consuming units and battery units.

[0021] According to a further development of the invention, it may be useful that the second supply device is allocated to the converter unit, and the second supply device is configured to supply and convert electrical energy from a first power supply network having a first voltage. This means that electrical energy from the first power supply network can be supplied to both the first and second intermediate circuits. Thus, for example, electric civil engineering machinery can be connected to the local power supply network during stationary operation and can therefore be operated entirely electrically, wherein the battery unit can also be charged. This ensures particularly environmentally friendly operation of the civil engineering machinery in urban environments. As an alternative or supplement, electric civil engineering machinery can be operated using the battery unit separately from the power source. This means that pure battery operation can be provided, especially for regulation or mobility. It is useful for this purpose to connect the battery unit to the local power source via the second supply device, so that the battery unit is charged independently of the first supply device.

[0022] Civil engineering machinery may have cantilever or mast, on which are mounted drilling drivers, diaphragm wall cutters, diaphragm wall clamps, vibrators or pile drivers with drilling tools.

[0023] The method according to the invention is characterized in that the circuit device includes a first intermediate circuit and a second intermediate circuit, wherein the first intermediate circuit operates at a first voltage level and the second intermediate circuit operates at a second voltage level different from the first voltage level.

[0024] This method is particularly applicable to the civil engineering machinery described above according to the invention. In this case, the aforementioned advantages can be achieved.

[0025] A preferred variation of the invention involves the intermediate circuits operating independently as closed circuits, and, if necessary, connected to the main circuit via switching devices, particularly DC / DC controllers, wherein electrical energy is distributed between the two intermediate circuits as needed. In particular, when a load peak occurs in one intermediate circuit, electrical energy can be supplied from one intermediate circuit to the other to balance the load. Advantageously, the voltage levels of the respective intermediate circuits are configured for the power demands of the power-consuming units, particularly milling machines and electric motors, to reduce cable cross-section and thus weight. The two different voltage levels also eliminate the need for additional converter devices, significantly improving energy efficiency. In principle, a failure of one supply device can be compensated for by creating a complete circuit and designing several supply devices. Particularly advantageously, the intermediate circuits are connected to the main circuit, and the power-consuming units of the first and second intermediate circuits, or other intermediate circuits, operate at the same voltage level.

[0026] Advantageously, the first intermediate circuit is provided as a power section, particularly as an onboard high-performance electrical system with a voltage level of approximately 800 volts up to 1500 volts, especially 1100 volts. The second intermediate circuit can preferably be provided as a peripheral section, particularly as a low-power onboard network with a lower voltage level, especially between 600 volts and 800 volts, or even between 300 volts and 400 volts. Alternatively, both intermediate circuits can have the same voltage level, especially a lower voltage level between 300V and 800V. This reduces the complexity of the switching device.

[0027] According to the invention, another particularly advantageous variation lies in the fact that, by means of a first supply device, electrical energy, especially alternating current voltage, is supplied from and, in particular, converted from a first power supply network having a first voltage, and by means of a second supply device, electrical energy, especially alternating current voltage, is supplied from and, in particular, converted from a second power supply network having a second voltage, which is different from the first voltage. In other words, according to the method of the invention, civil engineering machinery can be operated using electrical energy from the first power supply network and / or from the second power supply network. If needed, energy can be supplied from both the first and / or second power supply networks to both the first and second intermediate circuits. Here, energy can be supplied to the respective intermediate circuits either via the supply device or via a switching device. This enables reliable and rapid energy distribution. Attached Figure Description

[0028] The invention will now be further explained with reference to preferred exemplary embodiments, which are schematically illustrated in the accompanying drawings. The drawings show: Figure 1 This is a side view of the civil engineering machinery according to the present invention; Figure 2 This is a schematic diagram of a circuit device according to the present invention, the circuit device having two intermediate circuits and possible components; Figure 3 This is a schematic diagram of the circuit device according to the present invention based on the additional operation mode of civil engineering machinery; Figure 4 This is a schematic diagram of the circuit device according to the present invention based on the additional operation mode of civil engineering machinery; Figure 5 This is a schematic diagram of the circuit device according to the present invention based on the additional operation mode of civil engineering machinery; Figure 6 This is a schematic diagram of a circuit device according to the present invention based on an additional operating mode of civil engineering machinery; and Figure 7 This is a schematic diagram of a circuit device according to the present invention, which has two intermediate circuits and supplementary possible components. Detailed Implementation

[0029] exist Figure 1 The diagram illustrates a civil engineering machine 10 according to the invention, which has a carrying device 12. The carrying device 12 may preferably include tracks as a chassis 14, on which a superstructure 16 may be mounted, particularly in a rotatable manner. A control system 60 for the civil engineering machine 10 may be located in the operating compartment of the superstructure 16. Specifically, a beam-shaped mechanical component (specifically, a mast 20 shown here) may be mounted on the superstructure 16 in a preferably adjustable manner via a linkage mechanism 18 to form a lifting device. The mast 20 may preferably be configured as a guide 21 having a linear guide 24 along the mast 20 and may have a substantially vertical position during operation. The beam-shaped mechanical component (especially the mast 20) may also be directly connected to the superstructure 16 via a joint (not shown) and one or more actuating cylinders (not shown), the joint being located in the lower region of the beam-shaped mechanical component. Furthermore, according to the present invention, it is also possible that the beam-shaped mechanical component is a cantilever replacing the mast 20, the cantilever being angled and not shown, and the cantilever being adjustablely mounted on the superstructure 16.

[0030] According to the exemplary embodiment shown, the mast 20 may preferably be configured as a guide 21, having a linear guide 24 on its front side. For example, a work carriage 38 with a rotary drilling drive 36 may be mounted vertically along the linear guide 24. This allows the civil engineering machinery 10 to be configured as a drilling rig. The figures show an example of the center position of the rotary drilling drive 36 and the lower position indicated by dashed lines.

[0031] A cable 40 may be guided on a mast head 22 at the upper end of the mast 20, at one end of which a preferably retractable prismatic drill rod 32 with an exemplary auger 34 may be mounted to form a deep-digging tool 30. The prismatic drill rod 32 may be guided by a sleeve-shaped drive wheel of a rotary drilling drive 36 on a work carriage 38, such that torque may be transmitted from the rotary drilling drive 36 to the prismatic drill rod 32 via a drive bar (not shown). An auger 34 for forming a borehole in the ground may be mounted at the lower end of the prismatic drill rod 32. The drilling tool may be configured in any manner and may in particular include an auger 34 or a drill bucket.

[0032] The cable 40 can be guided from the screed 32 along the mast 20 via the deflection roller 26 on the mast head 22 to the cable winch 46 in the superstructure 16. The cable winch 46 is driven by an electric motor 50, which can also operate in regenerative mode. The screed 32 with the drill bit 34 can be raised and lowered by means of the cable 40 via the cable winch 46. During lowering, potential energy can be converted into electrical energy by the electric motor 50 and supplied to the intermediate circuit, which will be described in more detail below.

[0033] The working carriage 38 with the rotary drilling drive 36 can be pulled upward via another control cable 29 by means of an actuator 28 having a winch on the mast 20. The working carriage 38 with the rotary drilling drive 36 can also be lowered by appropriately driving the actuator 28 in the opposite direction. Similarly, the working carriage 38 can be pulled downward by the actuator 28. The rotary drilling drive 36 can be formed by a top drive having at least one additional electric motor. The actuator 28 can also be equipped with an electric motor (not shown), which can also operate in regenerative mode. The working carriage 38 with the rotary drilling drive 36 can also be considered part of the mining tool 30.

[0034] The control system 60 controls at least one electric motor 50 for operating the cable winch 46, and preferably also controls another electric motor for operating the actuator 28 configured as the winch.

[0035] Figure 2A circuit arrangement 70 according to the invention is schematically shown, the circuit arrangement having a first intermediate circuit 74 and a second intermediate circuit 76, wherein the first intermediate circuit 74 can be configured, in particular, as a DC link powered by a DC supply having a defined voltage of, for example, 1100 volts. The second intermediate circuit 76 can preferably operate at a defined voltage of 600 to 800 volts, but can also operate at a lower voltage of about 400 volts, or can operate with DC power.

[0036] The first intermediate circuit 74 can be configured to connect to a first supply device 86, which has an external energy source 82 for use as the primary energy supply. The energy source 82 can, in particular, be an AC power supply network. For example, the AC voltage can be 690 volts. The supply device 86 can preferably include a connector or terminal and a converter unit. Therefore, connection to the first supply device 86 can preferably be achieved using a detachable first plug connection 81 on the civil engineering machinery 10.

[0037] Energy can be transferred from energy source 82 to intermediate circuit 74, particularly via isolation converter 95 and converter device for converting alternating current to direct current. It is particularly advantageous that supply device 86 is configured to convert alternating current voltage to direct current voltage.

[0038] For further energy supply, the second intermediate circuit 76 may also have a second supply device 88 for connecting the circuit device 70 to a second power supply network 92. The second power supply network 92 may, for example, carry an AC voltage of about 400 volts. The supply device 88 may in particular include a converter unit (preferably an onboard charger 93) and a detachable second plug connection 83.

[0039] Figure 2 The onboard charger 93, schematically shown, can convert the AC voltage of the second plug connection 83 into the DC voltage required by the second intermediate circuit 76.

[0040] As shown here, battery cell 58 and additional power-consuming unit 64 can be electrically connected to a second intermediate circuit 76. Electrical energy can be supplied to or removed from at least one battery cell 58 to operate power-consuming unit 64. Internal battery cell 58 can be configured to be replaceable, particularly configured as a replaceable rechargeable battery.

[0041] According to the invention, the circuit device 70 is not composed of a single intermediate circuit 72. Instead, the circuit device 70 includes at least a first intermediate circuit 74 and a second intermediate circuit 76, which can be connected to a switching device 78. This means that by actuating the switching device 78, the intermediate circuits 74 and 76 can be connected to the main circuit 79. This established electrical connection allows electrical energy to be distributed from one intermediate circuit 74 or 76 to another as needed according to power requirements and operating conditions. For example, energy can be dissipated from the battery cell 58 and fed to the electric motor 51, which is a power-consuming unit 50, via the switching device 78. The electric motor 51 can drive one or more components 49, such as a pump, especially a hydraulic pump, via a distribution gearbox 48. The switching device 78 can preferably be configured as a contactor switch, a DC / DC controller, and / or an inverter.

[0042] In principle, the power supply of the circuit device 70 according to the invention can be configured in various ways, the circuit device having a first intermediate circuit 74 and a second intermediate circuit 76. According to Figure 2 The second intermediate circuit 76 shown in the figure is advantageous in that the second supply device 88 can be configured to obtain electrical energy from the second power supply network 92 and / or from the first power supply network 90 by means of an isolation converter 95.

[0043] The second power supply device 88 may in particular include an onboard charger 93, a detachable plug connection 83, and / or at least one additional switching device 97, 98. Specifically, using the first additional switching device 97, the second power supply device 88 can be configured to selectively supply electrical energy from the first power supply network 90 to the second intermediate circuit 76. Using the second additional switching device 98, the power supply device 88 can be configured to selectively supply electrical energy from the second power supply network 92 to the second intermediate circuit 76. Figure 2 In particular, an operating mode is shown in which switching devices 78, 97, 98 are disconnected, wherein electrical energy from the first power supply network 90 is supplied to the first intermediate circuit 74 by means of the first supply device 86. The second intermediate circuit 76 can be supplied from the second power supply network 92, for example, to charge the battery unit 58 or to power the power-consuming unit 64, especially the peripheral unit and / or cooling unit.

[0044] The civil engineering machinery 10 according to the present invention can be supplied with electrical energy in various ways via a first intermediate circuit 74 and a second intermediate circuit 76. (The following is in conjunction with...) Figures 3 to 7 The described circuit device 70 can preferably be used with Figure 2 The circuit arrangement 70 is similarly configured, with similar elements assigned the same reference numerals and not described multiple times to avoid repetition.

[0045] according to Figure 3 The circuit arrangement 70 of the present invention, schematically shown, allows the first intermediate circuit 74 to be connected to the second intermediate circuit 76 via a switching device 78, particularly for travel and setting operations. Figure 3 As shown, the first power supply device 86 does not need to be connected to an external energy source, i.e., a power grid. The plug connections 81 and 83 to the external energy source can be disconnected. Instead, the energy supply for the civil engineering machinery 10 according to the invention is provided by a battery cell 58 connected to a second intermediate circuit 76. Here, the voltage levels of the first intermediate circuit 74 and the second intermediate circuit 76 preferably correspond to the voltage level of the battery cell 58. This voltage level can be, in particular, about 600 volts to 800 volts, but can also be about 300 volts to 400 volts, and can depend on the state of charge of the battery cell 58.

[0046] according to Figure 3 The operating arrangement shown indicates that the civil engineering machinery 10 according to the present invention can be operated entirely by battery power, especially for processes where the distance from the first operating position to the second operating position at the construction site is several hundred meters, or for setting operations.

[0047] like Figure 4 As shown, in another operating mode, electrical energy can be additionally supplied by connecting the second supply device 88 to a second power supply network 92, which in particular has an AC voltage of 400 volts. However, this is not absolutely necessary. Figure 4 As shown, the second intermediate circuit 76 can be powered from the second power supply network 92, for example, to charge the battery unit 58 or to power the power-consuming unit 64, especially the peripheral unit.

[0048] exist Figure 3 and 4 In the configuration shown, the machinery can also operate with reduced power if needed due to the lower voltage level in the first intermediate circuit 74.

[0049] according to Figure 5 The circuit device 70 can be connected to a 690-volt AC power supply, particularly for supplying power to the intermediate circuit 72 during routine mechanical operation. During routine mechanical operation, such as... Figure 5As shown, the second intermediate circuit 76 can preferably be powered from a 690-volt AC voltage grid, which serves as a first power supply network 90. ​​This first power supply network has a second supply device 88 including a closed switch 97 and an onboard charger 93, an isolation converter 95, and a converter unit 94, wherein the switch 78 is open. Here, the first intermediate circuit 74 is powered, particularly via the first supply device 86. The second intermediate circuit 76 can also preferably be powered from a 690-volt AC grid, which serves as a first power supply network 90. ​​This first power supply network has a converter unit 94, a closed switch 97, and an onboard charger 93, wherein the converter unit 94 can be configured to convert a 690V voltage level to a 400V voltage level. This allows power to be supplied not only to peripheral power consumption devices (e.g., cooling systems) but also to the battery unit 58. When the switch 78 is open, the voltage of the first intermediate circuit 74 is preferably higher than the voltage of the second intermediate circuit 76, wherein the difference is particularly between approximately 500 volts and 300 volts.

[0050] As an alternative, the civil engineering machinery 10 according to the present invention can be based on Figure 6 The circuit arrangement 70, schematically shown, operates in a restricted mechanical mode, wherein the first supply device 86 of the first intermediate circuit 74 is connected to a local 400-volt AC voltage. Here, the first intermediate circuit 74 and the second intermediate circuit 76 may preferably be connected to a closed switching device 78, wherein the resulting total voltage level may correspond to the battery voltage level of the battery cell 58.

[0051] Alternatively, the first intermediate circuit 74 and the second intermediate circuit 76 may not be electrically connected, wherein the voltage of the first intermediate circuit 74 is higher than the voltage of the second intermediate circuit 76. In this case, the energy supply to the second supply device 88 can preferably be provided from the first power supply network 90, which in particular has a voltage level of 400V.

[0052] Figure 7 The operating mode of the circuit device 70 according to the invention in conventional mechanical operation is shown. Furthermore, Figure 7 Various other possible power-consuming units are schematically illustrated as examples, each of which is assigned to an intermediate circuit. In principle, a power-consuming unit can be assigned to any intermediate circuit. According to... Figure 7The circuit arrangement 70 of the present invention shown herein, wherein the first intermediate circuit 74 may preferably be used as an electrical component for operating at least one electric motor 51, which drives components 49 (such as one or more pumps, one or more winches, one or more rotary drives, one or more drilling drives, chassis and / or one or more actuating cylinders) via a distribution gearbox 48, and as an electrical component for operating a milling machine 120, particularly for driving one or more milling wheel motors 122, one or more motor feed pumps 124, one or more flushing agent pumps 126, and / or as an electrical component for operating a low-pressure milling network 128.

[0053] Furthermore, a second intermediate circuit 76 with a lower voltage may preferably be configured to operate the battery unit 58 and peripheral power-consuming units, particularly the battery-powered air conditioning system 108, air conditioning compressor 110, heater 112, and / or fan driver 114. These power-consuming units may typically be connected to the second intermediate circuit 76 by means of a DC / DC controller (not shown) or another converter unit.

[0054] As an alternative or supplement, the low-voltage circuit 100, particularly the 12-volt, 24-volt, or 48-volt airborne electrical system, can be distributed to the second intermediate circuit 76 by means of a DC / DC controller 84. Figure 7 In a variation of the embodiment shown, the low-voltage circuit 100 may include a water pump 102 and two 12V batteries 104 connected in series.

Claims

1. An electrically driven civil engineering machine, the civil engineering machine comprising: –Mobile load-bearing device; -At least one power-consuming unit; - At least one internal rechargeable battery unit for storing and supplying electrical energy; – At least one supply device for supplying electrical energy from an external energy source; and – A circuit device for supplying and releasing electrical energy from the at least one power-consuming unit as needed, wherein the circuit device is configured to distribute electrical energy between the at least one power-consuming unit and the supply device by means of an intermediate circuit. in, The circuit device includes a first intermediate circuit and a second intermediate circuit; The first intermediate circuit can operate at a first voltage level; The second intermediate circuit can operate at a second voltage level, which is different from the first voltage level.

2. The electrically operated civil engineering machinery according to claim 1, in, Provide at least two intermediate circuits.

3. The electrically operated civil engineering machinery according to claim 1, in, The intermediate circuits can operate independently of each other as closed circuits; and Two intermediate circuits can be connected to the main circuit by means of a switching device, especially a disconnecting device.

4. The electrically operated civil engineering machinery according to claim 1, in, The intermediate circuit is configured to supply electrical energy to and release electrical energy from the battery cells, wherein the battery cells are configured to control voltage levels to compensate for power peaks in the secondary circuit.

5. The electrically driven civil engineering machinery according to claim 1, in, At least one power-consuming unit includes a DC / DC controller.

6. The electrically driven civil engineering machinery according to claim 1, in, The intermediate circuit is configured to conduct and distribute direct current.

7. The electrically operated civil engineering machinery according to claim 1, in, The at least one power-consuming unit is configured as an electric motor, wherein the electric motor is assigned to an inverter unit configured to convert direct current to alternating current.

8. The electrically driven civil engineering machinery according to claim 1, in, The first supply device is configured to supply and convert electrical energy, particularly AC voltage, from a first power supply network having a first voltage. and The second supply device is configured to supply and convert electrical energy, particularly AC voltage, from a second power supply network having a second voltage, which is different from the first voltage.

9. The electrically driven civil engineering machinery according to claim 8, in, The converter unit is assigned to the second supply device, and the second supply device is configured to supply and convert electrical energy from a first power supply network having a first voltage.

10. A method for electrically operating civil engineering machinery, wherein the civil engineering machinery is particularly the civil engineering machinery according to claim 1, the civil engineering machinery comprising: –Mobile load-bearing device; -At least one power-consuming unit; - At least one internal rechargeable battery unit for storing and supplying electrical energy; – At least one supply device for supplying electrical energy from an external energy source; and – A circuit device for supplying and releasing electrical energy from the at least one power-consuming unit as needed, wherein the circuit device distributes electrical energy between the at least one power-consuming unit and the supply device by means of an intermediate circuit. in, The circuit device includes a first intermediate circuit and a second intermediate circuit; The first intermediate circuit operates at a first voltage level; and The second intermediate circuit operates at a second voltage level, which is different from the first voltage level.

11. The method according to claim 10, wherein, in, The intermediate circuits operate independently of each other as closed circuits; and If necessary, intermediate circuits are connected to the main circuit by means of switching devices, especially DC / DC controllers, where electrical energy is distributed between the two intermediate circuits as needed.

12. The method according to claim 10, in, Electrical energy, especially alternating voltage, is supplied from a first power supply network having a first voltage by means of a first supply device, and is in particular converted; and Electrical energy, particularly alternating voltage, is supplied from a second power supply network having a second voltage by means of a second supply device, and is in particular converted, wherein the second voltage is different from the first voltage.

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