Nonlinear lumped-circuit model for s.c.r.

A nonlinear s.c.r. circuit model made up of 6 lumped-circuit elements (3 nonlinear capacitors and 3 nonlinear voltage-controlled current sources) is presented. The model can be used for simulating arbitrary s.c.r. circuits under all operating conditions. In particular, it is capable of predicting all important dynamic effects such as turn-on and turn-off transients, dV/dt triggering, and the minimum commutation-time phenomenon. Computer-simulation results show that the model will correctly simulate all well-known triggering modes and turn-off mechanisms. The model is based entirely upon the device´s physical operating principles. Each element in the circuit model corresponds to an actual current component. In particular, carrier currents due to both diffusion and generation-recombination are included, in addition to the usual displacementcurrent components across the 3 depletion layers