General
The high-voltage on-board electrical system makes it possible to operate the electric machine for the electric drive. In addition, the high-voltage on-board electrical system supplies electrical energy to consumers with high energy demands, e. g. the refrigerant compressor or the PTC heater. In certain driving situations, the electric machine is used in generator mode for generating electrical energy (recuperation). The high-voltage on-board electrical system supplies the 12 V on-board electrical system with electrical energy from the high-voltage battery via a DC/DC converter.
Schematic diagram of high-voltage on-board electrical system (hybrid vehicle) |
1 | High-voltage battery (saves and supplies energy) |
2 | Battery management system control unit (energy management) |
3 | DC charger (direct current charge management) |
4 | AC charger (alternating current charge management) |
5 | Power electronics with DC/DC converter (control of electric machine (6) (depending on model), energy transfer to 12 V on-board electrical system) |
6 | Electric machine (generates energy (both generator mode and for driving)) |
7 | High voltage consumers (e.g. electric refrigerant compressor) |
8 | High voltage consumers (e.g. high voltage PTC heater) |
9 | Vehicle socket (connection to external charging station) |
P47.70-A028-76
The power electronics with DC/DC converter (5) and the high-voltage battery (1) as well as all high-voltage consumers are connected to each other through the high-voltage power distributor. The high-voltage consumers are protected by a fuse on the DC high-voltage power distributor.
The power electronics with DC/DC converter (5) and the electric machine (6) are connected to each other through the AC high-voltage power distributor.
P47.70-A027-79
Schematic diagram of high-voltage on-board electrical system (electric vehicle) |
1 | High-voltage battery (saves and supplies energy) | 10 | Front power electronics with DC/AC converter (control of front electric machine (11)) | |
2 | Battery management system control unit (energy management) | 11 | Front electric machine (generates energy when driving (in both generator mode and traction drive)) | |
3 | DC charger (direct current charge management) | 12 | Rear power electronics with DC/AC converter (control of rear electric machine (12)) | |
4 | AC charger (alternating current charge management) | 13 | Rear electric machine (generates energy when driving (in both generator mode and traction drive)) | |
7 | High voltage consumers (e.g. electric refrigerant compressor) | 14 | High-voltage power distributor with fuses | |
8 | High voltage consumers (e.g. high voltage PTC heater) | 15 | DC/DC converter (energy transfer to 12 V on-board electrical system) | |
9 | Vehicle socket (connection to external charging station) |
An electric vehicle can have one or two electric machines.
The high-voltage power distributor is equipped with 3 fuses that can be replaced.