Power supply system for motor vehicle, has diode element that connects second voltage tap to battery units, such that power flows to output terminal, if electrical output voltage of voltage converting unit drops below specific value

摘要

The system (1) has battery system (2) with battery units (6) having first voltage tap (3) to output first electrical output voltage, and second voltage tap (4) to output second electrical output voltage. A voltage converting unit (11) has input and output terminals (12,13) connected to respective voltage taps. The voltage tap (4) is connected to battery units by diode element (7), such that electric power flows to output terminal connected to electrical loads via diode element, when electrical output voltage of voltage converting unit drops below specific value.