Energy on-board network for the supply of a high-power consumer with increased availability requirements

摘要

On-board power supply for supplying a high-performance consumer with increased availability requirements, with - a generator (5), - a main battery (1) connected to the generator via the on-board network (3), - a large number of consumers (V1, V2 ), of which at least one is a high-performance consumer (15a, 15b), wherein - the high-performance consumer is connected to a backup battery (2) which is connected to the vehicle electrical system (3) via a controllable charging and disconnecting unit (16), - the High-performance consumer (15a, 15b) is a high-performance consumer with increased availability requirements, - the controllable charging and disconnection unit (16) has a first switching unit (S1) via which the main battery (1) can be connected to the high-performance consumer, - the controllable Charging and disconnecting unit (16) has a second switching unit (S2), via which the backup battery (2) can be connected to the high-performance consumer , and - the controllable charging and disconnecting unit (16) has a third switching unit (S3) via which the backup battery (2) can be connected to the on-board network (3), and - an electrical energy management system (12) which is used to generate control signals (s1, s2, s3) is provided for the switching units (S1, S2, S3), characterized in that - it can be operated in a buffer mode and the electrical energy management (12) is designed in such a way that in this buffer mode it receives the control signals for the switching units are generated in such a way that the first switching unit (S1) is closed, the second switching unit (S2) is closed and the third switching unit (S3) is open, - the electrical energy management (2) has means for quick detection of the presence of an undervoltage, which in Are implemented in the form of an analog comparator and in the event of a sudden loss of performance of the main battery (1), which is caused by a battery status detection (18) n icht can not be forecast and is not reflected in an increasing internal resistance of the main battery (1), the second switching unit (S2) to initiate a temporary buffer operation in the conductive state, and that - a charging phase of the backup battery (2) is initiated if the open circuit voltage of the backup battery (2) falls below a predetermined, application-dependent threshold value, which is set so that the state of charge of the backup battery (2) always has a value sufficient to supply the high-power consumers (15a, 15b).