Component Description For DC/DC Converter Control Unit - GF54.10-P-3006RFH
Model 253.354 with engine 274.920
Model 253.954 with engine 274.920
Shown on model 253.954
DC/DC converter control unit
The DC/DC converter control unit is installed as an independent component part in the vehicle. The DC/DC converter control unit converts a high voltage direct voltage (primary voltage) into a 12 V direct voltage (secondary voltage) and transfers this between the high-voltage on-board electrical system and the 12 V on-board electrical system.
Location
The DC/DC converter is located in the trunk under the load compartment cover.
Design of DC/DC converter control unit
Task
General
The DC/DC converter control unit enables energy to be exchanged between the high voltage on-board electrical system and the 12 V on-board electrical system, by transforming the high voltage direct voltage (primary voltage) into 12 V direct voltage (secondary voltage).
Interlock circuit
The interlock circuit is used as contact protection to protect people against inadvertent contact with high-voltage components. The interlock is an anticipatory contact which opens a little before the high-voltage connection when opening a high-voltage connection. In this way timely discharging of the high voltage intermediate circuit is achieved by the control units of the high-voltage components.
In order to do this, a 12 V/88 Hz interlock signal is looped through all assembly parts of the high voltage on-board electrical system that can be removed or opened. To do this there is an electrical bridge in each removable high-voltage connection which interrupts the interlock circuit during removal of the high-voltage connection. The interlock circuit is also led switched in a series over the 12 V control units plug connection of the high-voltage components.
CAN network
The charger is connected over the hybrid CAN (CAN L) to the vehicle's CAN network and exchanges data with the other control units.
Input and output signals
- Direct input signals
- Direct output signals
- Output connectors
- CAN input signals
- CAN output signals
Input factors and output factors for the following components are read in and output over direct lines by the DC/DC converter control unit:
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Circuit 15 | - | - |
| Circuit 30c (crash signal from pyrofuse (F63) | - | - |
| Circuit 30 | - | - |
| Circuit 31 | - | - |
| Interlock circuit | Interlock circuit | - |
The following components are connected to the DC/DC converter control unit through power connections:
| Output connections + | Output connections - | Supplemental information |
|---|---|---|
| Battery management system control unit high-voltage connection (N82/2) | Battery management system control unit high-voltage connection (N82/2) | - |
Input factors and output factors for the following control units are sent or received by the DC/DC converter control unit over the CAN:
| Input factors via hybrid CAN (CAN L) | Starting data via hybrid CAN (CAN L) | Supplemental information |
|---|---|---|
| Battery management system control unit (N82/2) | Battery management system control unit (N82/2) | - |
| Charger (N83/5) | Charger (N83/5) | - |
| Powertrain control unit (N127) | Powertrain control unit (N127) | Contains signals of further control units which are connected via the CAN network. |
| Power electronics control unit (N1291/) | Power electronics control unit (N129/) | - |
| Wiring diagram for DC/DC converter control unit | PE54.10-P-2105-97FBA |