Power supply device used in motor vehicles, has a voltage divider that divides the voltage across a capacitor or a derived voltage, if the voltage across capacitor or the derived voltage is less than the predetermined reference voltage

摘要

The power supply device has an input terminal through which input voltage (UV) is supplied, the output terminals for generating output voltages (U1,U2), a capacitor (C1), and a circuit device for discharging capacitor over a controllable switching element (T1), if the voltage at further capacitor (C2) is smaller than that of the resistors (R1,R2) with respect to first reference voltage. A voltage divider divides the voltage across the capacitor (C2) or the derived voltage, if the voltage across the capacitor (C2) or the derived voltage is less than the second reference voltage.