Unified relaxation-pseudocircuit approach for analogue-digital fault diagnosis

A unified frequency-domain relaxation-pseudocircuit approach is proposed and the associated solvability conditions are derived for the fault diagnosis of both the analogue and the analogue-digital circuits. Each component in the pseudocircuit containing both nonlinear analogue elements and digital elements is described by the associated relaxation model and the solution is obtained iteratively by the phasor technique. Consequently, both the development of theory and the implementation for practical application are made easier. In addition both the order of the pseudocircuit and the number of measurements are reduced. Two circuits are illustrated to show the efficiency of this approach