Multiple fault diagnosis in analogue circuits

The paper deals with multiple fault diagnosis in analogue AC or DC circuits with limited accessible terminals for excitation and measurement and brings an algorithm for identifying faulty elements and evaluating their parameters. The main achievement is a method enabling us to efficiently identify faulty elements. For this purpose some testing equations are derived playing a key role in identification of possibly faulty elements which are next verified using a test of acceptance. The proposed approach is described in detail for two fault diagnosis. Also extension to three fault diagnosis is given. Although the method pertains to linear circuits, some aspects of multiple fault diagnosis of nonlinear circuits can be also performed using the small signal approach. A numerical example illustrates the proposed method and shows its efficiency.