DEVICE AND METHOD FOR DETECTING A POLARITY REVERSAL ON A LOW-VOLTAGE SIDE OF A DC/DC CONVERTER IN A DUAL-VOLTAGE ONBOARD POWER SUPPLY SYSTEM

摘要

The invention relates to a device and method for detecting a polarity reversal on a low-voltage side of a DC/DC converter (6) in a dual-voltage onboard power supply system, in particular in a motor vehicle. The current flow in a connecting line on the low-voltage side of the DC/DC converter (6) is released by a controllable switching element (10), a current in a connecting line on the low-voltage side of the DC/DC converter (6) is detected by means of current sensors, the current direction of the detected current is evaluated by an evaluation unit, and a polarity reversal is detected when the current direction of the detected current deviates from an anticipated current direction.