WO2024068113A1 - Dispositif convertisseur cc-cc, système d'alimentation électrique et procédé de décharge d'un condensateur de liaison cc - Google Patents

Dispositif convertisseur cc-cc, système d'alimentation électrique et procédé de décharge d'un condensateur de liaison cc Download PDF

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Publication number
WO2024068113A1
WO2024068113A1 PCT/EP2023/072020 EP2023072020W WO2024068113A1 WO 2024068113 A1 WO2024068113 A1 WO 2024068113A1 EP 2023072020 W EP2023072020 W EP 2023072020W WO 2024068113 A1 WO2024068113 A1 WO 2024068113A1
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WO
WIPO (PCT)
Prior art keywords
converter
voltage
network
voltage network
connection
Prior art date
Application number
PCT/EP2023/072020
Other languages
German (de)
English (en)
Inventor
Roland Scheuerer
Julian Veitengruber
Wolfgang Haas
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2024068113A1 publication Critical patent/WO2024068113A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering

Definitions

  • DC-DC converter device power supply system and method for discharging an intermediate circuit capacitor
  • the present invention relates to a DC-DC converter device, in particular a DC-DC converter device for discharging an intermediate circuit capacitor, and a method for discharging an intermediate circuit capacitor.
  • the present invention further relates to a power supply system for an electric vehicle with such a DC-DC converter device.
  • Vehicles that are fully or at least partially electrically powered usually have at least two voltage levels.
  • a low-voltage network in the range of, for example, approx. 12 V is provided, which feeds consumers with lower power.
  • a high-voltage network in the range of a few hundred volts is provided, which feeds an electric drive system and usually also includes a so-called traction battery.
  • the publication DE 10 2009 055 053 A1 describes a method and a device for discharging an energy storage device, in particular an intermediate circuit capacitor, in a high-voltage network of a motor vehicle.
  • Disclosure of the invention discloses a DC-DC converter device, a power supply system and methods for discharging an intermediate circuit capacitor with the features of the independent claims. Further advantageous embodiments are the subject of the dependent claims.
  • a DC-DC converter device with a first DC-DC converter and at least one second DC-DC converter.
  • the first DC-DC converter is designed to be coupled to a first DC voltage network at a first connection.
  • the first DC-DC converter is designed to be coupled to a second DC voltage network at a second connection.
  • the second DC-DC converter is designed to be coupled to the first DC voltage network at a first connection.
  • the second DC-DC converter is designed to be coupled to the second DC voltage network at a second connection.
  • the first DC-DC converter is designed to transmit electrical energy from the first connection to the second connection of the first DC-DC converter.
  • the second DC-DC converter is designed to simultaneously transmit electrical energy from the second connection to the first connection of the second DC-DC converter.
  • a power supply system for an electric vehicle with a high-voltage network and a low-voltage network and a DC-DC converter device according to the invention is provided in the high-voltage network.
  • the first connections of the first DC-DC converter and the second DC-DC converter are electrically coupled to the high-voltage network.
  • the second connections of the first DC-DC converter and the second DC-DC converter are electrically coupled to the low-voltage vehicle electrical system.
  • a method for discharging an intermediate circuit capacitor provided in a first direct current network is coupled to a second direct current network by means of a direct current converter device, in particular the aforementioned direct current converter device according to the invention.
  • the direct current converter device comprises at least two direct current converters.
  • a first direct current converter is coupled to the first direct current network at a first connection and to a second direct current network at a second connection.
  • a second direct current converter is coupled to the first direct current network at a first connection and to the second direct current network at a second connection.
  • the following two steps are carried out simultaneously.
  • electrical energy is transmitted from the first connection to the second connection of the first direct current converter by means of the first direct current converter.
  • electrical energy is transmitted from the second connection to the first connection of the second direct current converter by means of the second direct current converter.
  • Electric drive systems such as those used in electric vehicles, are usually powered by a direct current in the range of several hundred volts.
  • Capacitors particularly so-called intermediate circuit capacitors, are usually provided to stabilize this direct current. These capacitors must be able to be controlled and discharged quickly in the event of a fault, among other things. If this is implemented using a separate, additional circuit, this requires additional effort in terms of costs and installation space.
  • the present invention is based on the knowledge that in electric vehicles, in addition to a high-voltage network with the electric drive system, another low-voltage network is usually provided.
  • the high-voltage network and the low-voltage network can be coupled to one another via a DC-DC converter device.
  • one idea of the present invention is to implement or at least support the discharge of the capacitances in the high-voltage network by means of the lossy DC-DC converter between the high-voltage network and the low-voltage network.
  • a device is used as the DC-DC converter device which comprises at least two separate DC-DC converter units.
  • a first DC-DC converter unit converts electrical energy from the high-voltage network to the low-voltage network, while in parallel a second DC-DC converter unit converts electrical energy from the low-voltage network to the high-voltage network in the opposite direction.
  • the electrical energy is transmitted in both directions simultaneously, with losses in the form of thermal energy also occurring in each DC-DC converter unit.
  • the electrical energy initially stored in the capacitors of the high-voltage network can thus be converted into thermal energy (e.g. current heat losses) during the simultaneous DC-DC conversion in the two DC-DC converter units, and the electrical energy stored in the capacitors is thus reduced without the need for additional separate circuit units.
  • DC-DC converter arrangements such as those used for coupling the high-voltage network and the low-voltage network in an electric vehicle, are in many cases designed for bidirectional operation anyway, ie for a DC-DC converter from the high-voltage network to the low-voltage network or vice versa from the low-voltage network to the high-voltage network.
  • DC-DC converter arrangements with several parallel DC-DC converter units are provided. The latter enables very good scaling, for example.
  • one or more DC-DC converter units can be activated depending on the power to be transmitted between the high-voltage network and the low-voltage network. In this way, the active DC-DC converter units can be operated very close to their optimal operating point, which can achieve a high level of efficiency.
  • a further operating mode in which some of these DC-DC converter units (at least one) are operated in such a way that electrical energy is transferred from the high-voltage network to the low-voltage network.
  • another part of the DC-DC converter units are operated in such a way that electrical energy is transferred from the low-voltage network to the high-voltage network.
  • electrical energy is transferred in a circle, so to speak.
  • all of the DC-DC converter units involved are lossy during operation, part of the energy is converted into thermal energy. In this way, the electrical energy previously stored in capacitive elements, such as the intermediate circuit capacitor, can be broken down and converted into thermal energy.
  • This thermal energy can be dissipated, for example, via a suitable cooling system. Since the process will generally only last a few seconds, the cooling system of the DC-DC converter device does not need to be expanded, or only needs to be expanded to a very small extent. Consequently, the electrical energy stored in capacities on the high-voltage network side can be reduced very quickly if required, without the need for complex additional components and measures.
  • the first connections of the first DC-DC converter and the first connections of the second DC-DC converter are each designed to be connected to an intermediate circuit capacitor.
  • the DC-DC converter device can comprise a control device. This control device can be designed to discharge the intermediate circuit capacitor, the first DC-DC converter and the to control the second DC-DC converter in the first operating mode.
  • the control device can therefore specifically control and carry out the discharging of the intermediate circuit capacitor.
  • control device is designed to set the first operating mode for discharging the intermediate circuit capacitor until an electrical voltage at the intermediate circuit capacitor falls below a predetermined threshold value. In this way, the electrical voltage can be reduced to a safe voltage level via the intermediate circuit capacitor and thus in the (deactivated) high-voltage network.
  • an electrical power that is transmitted from the first connection to the second connection of the first DC-DC converter is greater than an electrical power that is transmitted from the second connection to the first connection of the second DC-DC converter.
  • electrical energy is taken from the high-voltage network and the electrical energy storage devices present in the high-voltage network, such as the intermediate circuit capacitor.
  • an electrical power that is provided by the first DC-DC converter to the second connection of the first DC-DC converter corresponds to the electrical power that is fed in at the second connection of the second DC-DC converter.
  • the second DC-DC converter completely absorbs the electrical energy emitted by the first DC-DC converter. This means that no electrical energy is fed into the second DC voltage network.
  • a switching element for example a circuit breaker or similar, can be provided between the second connections of the first and second DC-DC converter and the second DC voltage network.
  • the second DC voltage network can be electrically isolated from the DC voltage converter and, on the other hand, the electrical energy stored in the first DC voltage network can be reduced by the electrical losses in the DC voltage converters.
  • care must be taken to ensure that the electrical voltage at the second connections of the DC-DC converters is within predetermined voltage ranges and, in particular, does not exceed a maximum limit value.
  • the second DC voltage network comprises a first DC voltage subnetwork and a second DC voltage subnetwork.
  • the first DC-DC converter can be designed to be coupled to the first DC-voltage sub-network of the second DC-voltage network at the second connection of the first DC-DC converter.
  • the second DC-DC converter can be designed to be coupled to the second DC-voltage sub-network of the second DC-voltage network at the second connection of the second DC-DC converter.
  • the first DC-DC converter and the second DC-DC converter are each connected to separate DC voltage sub-networks. This means that the individual DC sub-networks can be supplied with electrical energy independently of one another via separate DC-DC converters.
  • the DC-DC converter device can comprise a coupling element.
  • This coupling element is designed to electrically couple the first DC voltage subnetwork and the second DC voltage subnetwork to one another in the first operating mode.
  • electrical energy can be exchanged at the second connections of the DC-DC converters.
  • This makes it possible to feed the energy delivered by the first DC-DC converter to the second DC-DC converter into the second connection of the second voltage converter and in this way to reduce the electrical energy stored in the first DC-DC network through the electrical losses in the two DC-DC converters.
  • the first DC voltage network comprises a first sub-network and a second sub-network.
  • the first DC-DC converter can be designed to be coupled to the first sub-network of the first DC-DC voltage network at the first connection of the first DC-DC-DC converter
  • the second DC-DC converter can be designed to be coupled to the second sub-network of the first DC-DC voltage network at the first connection of the second DC-DC converter to be coupled.
  • the two DC-DC converters can each be connected to separate subnetworks of the first DC voltage network at the first connections.
  • the DC-DC converter device can comprise a coupling element. This coupling element can be designed to electrically couple the first sub-network and the second sub-network of the first DC voltage network to one another in the first operating mode.
  • the two DC-DC converters can be supplied with electrical energy from separate sub-networks during normal operation.
  • the two sub-networks can be electrically coupled to one another.
  • the first DC voltage converter and/or the second DC voltage converter is designed to alternately transmit electrical energy from the first DC voltage network to the second DC voltage network and from the second DC voltage network to the first DC voltage network.
  • the periods for changing the direction of transmission of the electrical energy can be selected to be relatively short.
  • the change can take place regularly with a period of a few milliseconds, 10 or 100 ms.
  • a maximum of as much energy can be transmitted as can be absorbed by the respective DC voltage network, in particular the second DC voltage network.
  • the electrical energy in the first DC voltage network can also be reduced by means of a single DC voltage converter, for example if one of the two DC voltage converters fails.
  • a second operating mode is provided in the DC-DC converter device.
  • the first DC-DC converter and/or the second DC-DC converter is designed to transmit electrical energy from the first connection to the second connection of the first DC-DC converter.
  • the first DC-DC converter and/or the second DC-DC converter can be designed to transmit electrical energy from the second connection to the first connection of the first DC-DC converter.
  • a further operating mode is provided in the DC-DC converter device in which the first DC-DC converter is designed to alternately transmit electrical energy from the first connection to the second connection of the first DC-DC converter and electrical energy from the second connection to the first connection of the second DC-DC converter. This also makes it possible to discharge the electrical energy stored on the high-voltage network side using just one DC-DC converter if, for example, the second DC-DC converter cannot be used due to a malfunction or the like.
  • Fig. 1 a schematic representation of a block diagram of an arrangement of a power supply network with a DC-DC converter device according to an embodiment
  • Fig. 5 a schematic representation of a block diagram of an arrangement of a power supply network with a DC-DC converter device according to another embodiment
  • Fig. 7 a flowchart as the basis for a method according to an embodiment.
  • Figure 1 shows a schematic representation of a block diagram of a DC-DC converter device 10 for coupling a high-voltage network 2 with a low-voltage network 1.
  • the high-voltage network 2 and the low-voltage network 1 could be the corresponding on-board network of an electric vehicle.
  • electrical consumers such as control units, ventilation, comfort functions, multimedia components, etc. can be supplied with electrical energy via the low-voltage network 1.
  • the electrical voltage of the low-voltage network 1 is usually a maximum of 48 V, usually around 12 or 24 V.
  • the high-voltage network 2 can, for example, comprise an electrical drive system with an electrical machine 23.
  • a direct voltage of the high-voltage network 2 can be converted by means of an electrical power converter 22 into a single-phase or multi-phase alternating voltage, which is suitable for controlling the electrical machine 23 according to setpoint specifications.
  • an intermediate circuit capacitor 21 can be provided, for example.
  • the electrical voltage in the high-voltage network 2 can be several hundred volts.
  • the electrical voltage in the high-voltage network 2 can be in the range between 350 and 400 V or 800 V.
  • an electrical energy storage device for example a traction battery 30, can be provided in the high-voltage network 2, which is coupled to the high-voltage network 2 via a disconnector 31.
  • the low-voltage network 1 and the high-voltage network 2 can be electrically coupled to one another by means of a DC-DC converter device 10.
  • the DC-DC converter device 10 can be a device that enables bidirectional DC-DC conversion between the low-voltage network 1 and the high-voltage network 2.
  • the DC-DC converter device 10 can transfer electrical energy from the high-voltage network 2 to the low-voltage network 1, as well as electrical energy from the low-voltage network 1 to the high-voltage network 2.
  • the DC-DC converter device 10 can comprise several units with DC-DC converters 11, 12.
  • the number of two DC-DC converters 11, 12 shown here is only an example. to explain the basic principle of the invention and is not intended to limit the present invention. In addition, three or more units of DC-DC converters are also possible.
  • the individual DC-DC converters 11, 12 can be designed the same or at least similar. Alternatively, it is also possible for the individual DC-DC converters 11, 12 to be designed differently, and in particular to be designed for a different maximum power transmission. By using several parallel DC-DC converters 11, 12, for example, the number of active DC-DC converters can be adjusted depending on the electrical power to be transmitted. In this way, the DC-DC converters can be operated as close as possible to their optimal operating point. This allows the efficiency of the DC-DC converters to be increased.
  • FIG. 2 shows a schematic representation of the energy flow in an operating mode in which, for example, electrical energy is provided by the traction battery 30.
  • the isolating switch 31 between the traction battery 30 and the high-voltage network 2 is closed.
  • the electrical energy can be used, on the one hand, to control the electrical machine 23 via the power converter 22.
  • electrical energy provided by the traction battery 30 can also be transferred to the low-voltage network 1 by means of the DC-DC converter device 10 in order to supply electrical consumers in the low-voltage network 1 with energy and/or to charge a battery in the low-voltage network 1.
  • one or more DC-DC converters 11, 12 can actively carry out a DC voltage conversion from the high-voltage network 2 to the low-voltage network 1.
  • Figure 3 shows a schematic representation of the energy flow in a further operating mode, in which, for example, electrical energy is transferred from an energy storage in the low-voltage network 1 to the high-voltage network 2.
  • the isolating switch 31 between the traction battery 30 and the high-voltage network 2 is open.
  • the electrical voltage in the high-voltage network 2 can thus be adjusted to the electrical voltage at the traction battery 30.
  • the circuit breaker 31 can then be closed without a significant current flowing at the time of closing. In this way, sparks or the like can be avoided when the isolating switch 31 is closed.
  • FIG 4 shows a schematic representation of the energy flow in a further operating mode according to the invention.
  • the isolating switch 31 between the traction battery 30 and the high-voltage network 2 is open.
  • the intermediate circuit capacitor 21 is still charged.
  • at least one DC-DC converter 11, 12 of the DC-DC converter device 10 can transfer electrical energy from the high-voltage network and thus from the intermediate circuit capacitor 21 into the low-voltage network 1. If the electrical energy transferred in this way cannot be completely absorbed or consumed in the low-voltage network 1, at least one further DC-DC converter 11, 12 can convert electrical energy from the low-voltage network 1 towards the high-voltage network 2.
  • electrical energy is simultaneously transferred from the high-voltage network 2 to the low-voltage network 1 using a first part of the DC-DC converters 11, 12, and electrical energy is simultaneously transferred from the low-voltage network 1 to the high-voltage network 2 using a further part of the DC-DC converters 11, 12.
  • the DC-DC converters 11, 12 are lossy modules, losses occur during the DC-DC conversion. Electrical energy is converted into thermal energy. Consequently, during the simultaneous voltage conversion from the high-voltage network 2 into the low-voltage network 1 and back into the high-voltage network 2, electrical energy is continuously converted into thermal energy. Thus, the electrical energy stored in the high-voltage network 2, for example the electrical energy in the intermediate circuit capacitor 21, is gradually reduced and converted into thermal energy. This thermal energy can be dissipated to the DC-DC converter 11, 12 using appropriate cooling devices. The electrical energy in the high-voltage network 2 can therefore be reduced even if no or only little electrical energy can be absorbed by the low-voltage network 1.
  • the low-voltage network 1 can absorb some of the electrical energy from the high-voltage network 2, additional electrical energy can be removed from the high-voltage network 2 through the simultaneous voltage conversion from the high-voltage network 2 to the low-voltage network 1 and vice versa from the low-voltage network 1 to the high-voltage network 2.
  • This allows the electrical energy stored in the high-voltage network 2 to be discharged quickly.
  • This process for actively discharging the high-voltage network 2 or the capacitances in the high-voltage network 2 will usually take place within a few seconds.
  • the process for removing the electrical energy from the high-voltage network 2 can be carried out until the electrical voltage in the high-voltage network 2 falls below a predetermined threshold value.
  • a control device 13 can be provided to control the DC-DC converters 11, 12 in the operating model described above.
  • This control device 13 can, for example, specify target values for the direction of the voltage converters and the level of the output voltage at the individual DC-DC converters 11, 12, depending on the operating mode.
  • FIG. 5 shows a schematic representation of a block diagram of a DC-DC converter device 10 according to a further embodiment.
  • the DC-DC converter device 10 of this embodiment differs from the previously described embodiments in particular in that an additional separating element 16, for example a circuit breaker or the like, can be provided between the DC-DC converter device 10 and the low-voltage network 1.
  • the low-voltage network 1 can be electrically connected or separated from the DC-DC converter device 10 by means of this separating element 16.
  • All statements made previously in connection with the DC-DC converter device 10 apply.
  • the electrical connection between the DC-DC converter device 10 and the low-voltage network 1 is interrupted.
  • this can occur due to a cable break, a torn-off plug or similar.
  • the high-voltage network 2 can be discharged in a similar way to the procedure when the trend device 16 is open.
  • the electrical energy output by one DC-DC converter 11 on the low-voltage side must be completely absorbed by the other DC-DC converter 12.
  • care must be taken to ensure that the electrical voltage on the low-voltage network 1 side is within a permissible value range.
  • the DC-DC converters 11, 12 must be regulated in such a way that the electrical voltage output does not exceed a maximum permissible value.
  • FIG. 6 shows a schematic representation of a block diagram of a DC-DC converter device 10 according to yet another embodiment.
  • the DC-DC converter device 10 of this embodiment differs from the previously described embodiments in particular in that the DC-DC converters 11, 12 on the high-voltage network side and/or the low-voltage side can each be connected to separate high-voltage network sub-networks 2a, 2b or low-voltage network sub-networks la, lb.
  • the respective high-voltage network sub-networks 2a, 2b preferably have at least approximately the same electrical voltage level, and the respective low-voltage network sub-networks la, lb also preferably have at least approximately the same electrical voltage level.
  • this embodiment provides coupling elements 14, 15 which can electrically connect the sub-networks 2a, , 2b or la, lb on the low-voltage side or the high-voltage side. If, for example, several sub-networks la, lb are provided on the low-voltage side, these sub-networks la, lb can be electrically connected to one another by means of the coupling element 14. Similarly, several sub-networks 2a, 2b on the high-voltage side can be electrically connected to one another by means of a coupling element 15.
  • the respective sub-networks la, lb or 2a, 2b can be electrically connected to one another when electrical energy is to be dissipated in the high-voltage network 2 or one of the sub-networks 2a, 2b on the high-voltage side, as has already been explained in connection with the previous exemplary embodiments.
  • the coupling element 15 between the sub-networks 2a, 2b on the high-voltage side can, for example, comprise a 400/800V battery switch, as is used, for example, in 800V high-voltage on-board networks for charging at 400V DC charging stations.
  • modules of the traction battery 30 are changed from serial to parallel connection. This corresponds to a connection of the high-voltage sub-networks 2a, 2b analogous to a closed coupling element 15.
  • DC-DC converter devices 10 it is also possible to arrange two or more DC-DC converter devices 10 in parallel with one another. In this way, several forward and reverse feed paths as well as separation and coupling paths can be created between the subnetworks 2a, 2b and la, lb on the low-voltage side and the high-voltage side, respectively. In this case, a total of several DC-DC converters 11, 12 can be present.
  • a further operating mode can optionally be provided in which at least one DC-DC converter 11, 12 periodically alternately transmits electrical energy first to the high-voltage network 2 in the direction of the low-voltage network 1 and from the low-voltage network 1 in the direction of the high-voltage network 2.
  • the electrical energy in the high-voltage network 2 can be reduced even if only one DC-DC converter 11 or 12 is available, for example because the additional DC-DC converter 11 or 12 has failed. This means, for example, that a type of emergency operation is possible in the event of a DC-DC converter 11 or 12 failing.
  • the individual periods for the alternating transmission of electrical energy between the high-voltage network 2 and the low-voltage network 1 should be chosen as short as possible.
  • Figure 7 shows a flowchart on which a method for discharging an intermediate circuit capacitor is based according to one embodiment.
  • the method can be carried out in particular with a DC-DC converter device 10, as previously described in connection with FIGS. 1 to 6.
  • the method can in particular include any steps, as were also previously explained in connection with FIGS. 1 to 6 for the operation of the DC-DC converter device 10.
  • the previously described DC-DC converter device 10 can also include any components that may be required to implement the method described below.
  • High-voltage network 2 into the low-voltage network 1. At least one
  • DC-DC converters 11, 12 of the DC-DC converter device 10 mentioned DC voltage conversion in front of the high-voltage network 2 into the low-voltage network 1.
  • a DC voltage conversion takes place from the low-voltage network 1 to the high-voltage network 2.
  • At least one further DC-DC converter 11, 12 of the DC-DC converter device 10 carries out the DC-voltage conversion from the low-voltage network 1 to the high-voltage network 2.
  • the described DC voltage conversions can be carried out at least until an electrical voltage in the high-voltage network 2 and thus across the intermediate circuit capacitor 21 falls below a predetermined threshold value.
  • the present invention relates to a discharge of energy storage devices in a high-voltage network.
  • a DC-DC converter device with at least two DC-DC converters is provided, with at least one DC-DC converter carrying out energy transfer from the high-voltage network to a low-voltage network and, in parallel, at least one further DC-DC converter carrying out energy transfer from the low-voltage network to the high-voltage network.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne la décharge d'accumulateurs d'énergie tels que, par exemple, des condensateurs de liaison CC dans un système haute tension, en particulier un système haute tension d'un véhicule électrique. A cet effet, l'invention concerne un dispositif convertisseur CC-CC comprenant au moins deux convertisseurs CC-CC, au moins un convertisseur CC-CC transmettant la puissance du système haute tension à un système basse tension et, en parallèle avec celui-ci, au moins un autre convertisseur CC-CC transmettant la puissance du système basse tension au système haute tension.
PCT/EP2023/072020 2022-09-27 2023-08-09 Dispositif convertisseur cc-cc, système d'alimentation électrique et procédé de décharge d'un condensateur de liaison cc WO2024068113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022210192.8 2022-09-27
DE102022210192.8A DE102022210192A1 (de) 2022-09-27 2022-09-27 Gleichspannungswandlervorrichtung, Energieversorgungssystem und Verfahren zum Entladen eines Zwischenkreiskondensators

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WO2024068113A1 true WO2024068113A1 (fr) 2024-04-04

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DE (1) DE102022210192A1 (fr)
WO (1) WO2024068113A1 (fr)

Citations (6)

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DE10230384A1 (de) * 2002-07-05 2004-01-29 Siemens Ag Schaltungsanordnung und Verfahren zum Betreiben dieser Schaltungsanordnung
DE102009055053A1 (de) 2009-12-21 2011-06-22 Robert Bosch GmbH, 70469 Verfahren und Vorrichtung zur Entladung eines Energiespeichers in einem Hochspannungsnetz
EP2607294A1 (fr) * 2011-12-21 2013-06-26 STILL GmbH Machine de travail mobile dotée d'un générateur de démarrage
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