Power supply system for a vehicle with a low voltage distribution network and a high voltage distribution network

摘要

The invention is a power supply system for a motor vehicle having a low-voltage electrical system and having a higher-voltage electrical system, in which each of the negative terminal or the positive terminal of at least the high-power consumers of the higher-voltage vehicle electrical system are connected via a central bus in each case to the minus terminal or to the plus terminal of the low-voltage onboard network, and wherein the central collecting line has a controllable switch.; Furthermore, means for measuring the voltage of the low-voltage onboard network and / or means for measuring the differential current between the current flowing on the positive lead and the current flowing on the negative line current in the higher voltage network are provided. The controllable switch is opened when the voltage of the low-voltage onboard network has exceeded a predetermined voltage threshold and / or when the differential current exceeds a predetermined current threshold.