Power Distribution Module: Description and Operation

Automatic Start/Stop Function, 2nd Generation

DC / DC converter

Due to the considerably more frequent occurrence of starting operations, the electrical load that occurs often leads to voltage dips in the vehicle electrical system. To guarantee the supply voltage for specific, voltage-sensitive electrical components, a DC/DC converter is used with the Automatic Start/Stop function. The DC/DC converter supplies both relays "terminal 30g_DC/DC" and "terminal 30g-f_DC/DC" with voltage that is constant even during the starting operation.

The DC/DC converter is fitted in the electronics box in the engine compartment.

The electronics use the input voltage and terminal 50 measuring cables to determine whether or not the voltage supply of the outlet is supplied via the bypass or via the DC/DC converter. In bypass mode, the vehicle voltage is not supplied via the DC/DC converter, but is transferred directly to the outlets. In the booster phase, the vehicle voltage is adapted.

With M vehicles, two DC / DC converters are installed.

For the complete information on the Automatic Start/Stop Function, please refer to the Description in Starting System. Description and Operation