Component Description For DC/DC Converter Control Unit - GF54.10-P-3006LFH
Model 222.163 with engine 276
Model 222.173 with engine 276
Shown: Model 222.163
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 onboard 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 high voltage on-board electrical system assembly parts 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 to the vehicle CAN network via the hybrid CAN (CAN L) and exchanges data with 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 rear pre-fuse box (F33) | - | - |
| 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) | Output factors 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 (N129/1) | Power electronics control unit (N129/1) | - |
| Wiring diagram for DC/DC converter control unit | PE54.10-P-2105-97SEA |