VEHICLE ELECTRICAL CIRCUIT AND CONTROL DEVICE FOR THIS CIRCUIT

摘要

An on-board power system for a vehicle has a switch (SW), a comparison device and a detection device and is capable of reliably detecting a state in which the switch is opened in an uncontrolled fashion or incorrectly has a high impedance. The switch connects the battery (BAT) to the system load (L) and to the generator (G) when the power demand in the on-board power system increases. The comparison device (VE) compares the alternating voltage component in the on-board power system with a predefined potential.