CN114523921A - Electrical network in a motor vehicle - Google Patents

Electrical network in a motor vehicle Download PDF

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Publication number
CN114523921A
CN114523921A CN202111401363.2A CN202111401363A CN114523921A CN 114523921 A CN114523921 A CN 114523921A CN 202111401363 A CN202111401363 A CN 202111401363A CN 114523921 A CN114523921 A CN 114523921A
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CN
China
Prior art keywords
voltage
network
low
converter
electrical network
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Pending
Application number
CN202111401363.2A
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Chinese (zh)
Inventor
R.芬尼格维斯
S.施图茨
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Volkswagen AG
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Volkswagen AG
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Publication of CN114523921A publication Critical patent/CN114523921A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • 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
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/12—Buck converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/14—Boost converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • 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
    • H02J1/08—Three-wire systems; Systems having more than three wires

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to an electrical network (1) in a motor vehicle, wherein the electrical network (1) has at least one high-voltage network (2) and at least two low-voltage networks (3, 4), wherein the high-voltage network (2) and the at least two low-voltage networks (3, 4) are connected to one another by a galvanically isolated DC-DC converter (8), wherein the galvanically isolated DC-DC converter (8) has a primary winding (9) associated with the high-voltage network (2) and a number of secondary windings (10, 11) corresponding to the number of low-voltage networks (3, 4), which are each assigned to the low-voltage network (3, 4) associated therewith.

Description

Electrical network in a motor vehicle
Technical Field
The invention relates to an electrical network in a motor vehicle.
Background
An electric or hybrid vehicle has an electrical network comprising a high-voltage electrical network (>60V) and a low-voltage electrical network (< 60V). The high-voltage system is also referred to as the traction system and the low-voltage system is also referred to as the on-board system. In this case, it is also known to connect the two sub-networks to one another via galvanically isolated direct current-direct current converters (DC/DC converters) so that the on-board electrical system can be charged from the high-voltage battery in the high-voltage electrical system.
In particular in the case of autonomous motor vehicles, the on-board electrical system must be designed redundantly in order to ensure failsafe operation. Accordingly, two galvanically isolated dc-dc converters are required.
DE 102012203612 a1 discloses a battery charging device having a first and a second input terminal, a first and a second output terminal, and a first galvanically decoupled dc voltage converter. The direct-current voltage converter has a primary-side inverter, which is coupled to the first and second input terminals. The dc voltage converter also has a transformer having a primary side transformer winding and first and second secondary side transformer windings. The first secondary-side rectifier is arranged between the first secondary-side transformer winding and the output connection. The second secondary-side rectifier is coupled with the second secondary-side transformer winding. The battery charging device also has a second current decoupled dc voltage converter. The second current decoupled dc-to-dc converter has a primary-side inverter and a transformer with a primary-side transformer winding and a secondary-side transformer winding. Furthermore, a secondary rectifier is provided, which is arranged between the secondary transformer winding and the output connection. The battery charging device is designed to provide a first charging voltage for a first battery (high-voltage battery) at the output terminal and a second charging voltage for a second battery (vehicle electrical system battery) at the output terminal of a second secondary-side rectifier of the first galvanically decoupled direct-current voltage converter. Here, it is further disclosed that energy transfer from the first secondary side transformer winding to the second secondary side transformer winding is also made possible by using an active rectifier circuit.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the electrical system in a motor vehicle having at least one high-voltage network and at least two low-voltage networks is simplified in terms of circuit technology.
The solution to the above-mentioned technical problem is achieved by a power grid having the features according to the invention. Further advantageous embodiments of the invention result from the preferred embodiments.
For this purpose, the electrical network in the motor vehicle has at least one high-voltage network and at least two low-voltage networks, wherein the high-voltage network and the at least two low-voltage networks are connected to one another by a galvanically isolated dc-dc converter, wherein the galvanically isolated dc-dc converter has a primary winding associated with the high-voltage network and a number of secondary windings corresponding to the number of the low-voltage networks, which secondary windings are each assigned to the low-voltage network associated therewith. The number of components required is thereby reduced compared to two separate dc-dc converters, since only one primary side needs to be constructed.
In one embodiment, the dc-dc converter is designed as a bidirectional dc-dc converter. It is therefore also possible to transmit energy from both low-voltage networks into the high-voltage network, for example in order to precharge an intermediate circuit capacitor in the high-voltage network. In particular, a precharging circuit in the high-voltage network can therefore be dispensed with.
In a further embodiment, the dc-dc converter is designed such that energy can be transferred between the secondary windings. In this way, the low-voltage network can continue to operate redundantly in the event of a failure of the high-voltage network.
In another embodiment, at least one sub-grid is associated with an isolation element. The isolating element is preferably arranged between the winding and the smoothing circuit capacitor/intermediate circuit capacitor. Alternatively, the separating element can also be arranged between the smoothing circuit capacitor/intermediate circuit capacitor and the connection to the battery. By means of one or more isolating elements, for example, the partial networks can be disconnected during charging or else defective partial networks can be disconnected.
In a further embodiment, at least one sub-grid is associated with two isolation elements, so that the at least one sub-grid can be isolated on all poles.
In another embodiment, each sub-grid is associated with at least one isolation element, further preferably, each sub-grid is associated with two isolation elements.
In a further embodiment, the isolation element is designed as a relay and/or a semiconductor switch. The advantage of the relay is that the sub-grid is galvanically isolated, whereas the advantage of the semiconductor switch is that it is switched on and off more quickly. This can also be mixed in a targeted manner, so that the partial networks are switched off rapidly by means of the semiconductor switches, wherein the slow relays then isolate the partial networks at least in terms of unipolar ground currents.
A preferred field of application is in partially or fully autonomous motor vehicles.
Drawings
The invention will be explained in more detail below with reference to preferred embodiments. The single figure shows a schematic block circuit diagram of an electrical network in a motor vehicle.
Detailed Description
Fig. 1 schematically shows an electrical network 1 in a motor vehicle. The electrical network 1 has a high-voltage network 2 and a first low-voltage network 3 and a second low-voltage network 4. For the sake of clarity, only one high-voltage battery 5 and two main contactors HS1, HS2 are shown in the high-voltage network 2. Likewise, only one first onboard power grid battery 6 is shown for the first low-voltage power grid 3 and only one second onboard power grid battery 7 is shown for the second low-voltage power grid 4. A galvanically isolated dc-dc converter 8 is arranged between the high-voltage network 2 and the two low- voltage networks 3, 4. The dc-dc converter 8 has a primary winding 9, a first secondary winding 10 and a second secondary winding 11. Each winding 9-11 is associated with an active rectifier having at least four switching elements S1-S4. By means of the respective diagonal circuits of the switching elements S1-S4, it is possible either to convert the direct voltage of the associated battery 5-7 into an alternating voltage or to rectify the alternating voltage induced in the windings 9-11 into a direct voltage, depending on the energy transmission direction. Further, smoothing capacitors C are provided, respectively. Two separating elements TR1, TR2 are arranged between the smoothing capacitor C and the switching elements S1 to S4 or the windings 9 to 11, respectively. The switching elements S1 to S4 and the separating elements TR1, TR2 are controlled by at least one control device, not shown.
If the first vehicle electrical system battery 6 and/or the second vehicle electrical system battery 7 is charged by the high-voltage battery 5, an alternating voltage is generated in the primary winding 9, which then induces a voltage in the secondary windings 10, 11, which is then rectified and brings about a charging current. If one of the two vehicle electrical system batteries 6, 7 is not being charged, it is disengaged by opening the associated disconnecting element TR1, TR 2. In the case of a defective switching element S1-S4, the associated partial network can also be decoupled by the isolating elements TR1, TR2, so that it has no adverse effect.
Conversely, if the intermediate circuit capacitor of the high-voltage network 2 is pre-charged, the direct voltage of the first and/or second on-board network battery 6, 7 is converted into an alternating voltage, which induces an alternating voltage in the primary winding 9, which is then rectified and charges the intermediate circuit capacitor. Here, the high-side smoothing capacitor C may also be used as an intermediate circuit capacitor.
Furthermore, energy transfer can also take place via the two secondary windings 10, 11, so that the first on-board power grid battery 6 charges the second on-board power grid battery 7 and vice versa. This is important, for example, when a faulty high-voltage network 2 has to be disconnected. It should be understood that the principle can also be applied to more than two low- voltage networks 3, 4.
List of reference numerals
1 electric network
2 high-voltage network
3 first Low-Voltage network
4 second Low-Voltage network
5 high-voltage battery
6 first vehicle-mounted power grid battery
7 second on-board network battery
8 DC-DC converter
9 primary winding
10 first secondary winding
11 second secondary winding
S1-S4 switch element
TR1-TR2 isolation element
HS1 and HS2 main contactor
C smoothing capacitor

Claims (7)

1. An electrical network (1) in a motor vehicle, wherein the electrical network (1) has at least one high-voltage network (2) and at least two low-voltage networks (3, 4), wherein the high-voltage network (2) and the at least two low-voltage networks (3, 4) are connected to one another by a galvanically isolated dc-dc converter (8), wherein the galvanically isolated dc-dc converter (8) has a primary winding (9) associated with the high-voltage network (2) and has a number of secondary windings (10, 11) corresponding to the number of low-voltage networks (3, 4), which are each assigned to its associated low-voltage network (3, 4).
2. The electrical network as claimed in claim 1, characterized in that the dc-dc converter (8) is designed as a bidirectional dc-dc converter (8).
3. Electrical network according to any one of the preceding claims, characterized in that the dc-dc converter (8) is designed such that energy can be transferred between the secondary windings (10, 11).
4. The electrical network as claimed in any one of the preceding claims, characterized in that at least one sub-network (2 to 4) is associated with at least one disconnector (TR1, TR 2).
5. The electrical network according to claim 4, characterized in that at least one sub-network (2-4) is associated with two disconnectors (TR1, TR 2).
6. The electrical network according to claim 4 or 5, characterized in that each sub-network (2-4) is associated with at least one disconnector (TR1, TR 2).
7. The electrical network as claimed in any one of claims 4 to 6, characterized in that the disconnector (TR1, TR2) is designed as a relay and/or a semiconductor switch.
CN202111401363.2A 2020-11-23 2021-11-22 Electrical network in a motor vehicle Pending CN114523921A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020214699.3A DE102020214699A1 (en) 2020-11-23 2020-11-23 Electrical network in a motor vehicle
DE102020214699.3 2020-11-23

Publications (1)

Publication Number Publication Date
CN114523921A true CN114523921A (en) 2022-05-24

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DE (1) DE102020214699A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022213105A1 (en) 2022-12-06 2024-06-06 Volkswagen Aktiengesellschaft Motor vehicle with a high-voltage electrical system

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