Patent ID: 9658268
Date: 2017-05-23
CPC Classifications: G01R

Claim:
1. A device for diagnosing a fault in a circuit arrangement, the circuit arrangement having at least two load circuits connected in parallel with one another to a common supply line, the device comprising: a current measuring device connected in the common supply line of the at least two load circuits and configured for providing a current signal representing a current in the common supply line; a voltage measuring device for detecting and providing a node voltage of each load circuit in two switching states of a respective switching element thereof; and an evaluation device disposed to receive the current signal and the node voltages, said evaluation device being configured to convert the current signal into at least one logic current value and to convert the node voltages into logic voltage values and, based on predefined combinations of the at least one logic current value and the logic voltage values, to conclude a type and a location of the fault.