Implementing the IGBT Model into a
Circuit Simulator
Usually a netlist is employed in a circuit simulator such as
Saber to describe an electrical circuit. Each component of the
circuit is defined by a model template with the component
terminal connection and the model parameters values. While
The IGBT circuit model is generated by defining the
currents between terminal nodes as a nonlinear function of
component variables and their rate of change. An IGBT circuit
model is shown in Fig. 7.17. Compared to Fig. 7.16 the bipolar
transistor is replaced by the two base and collector-current
sources. There is a distributed voltage drop due to diffusion
and drift in the base regions. The drift terms in the ambipolar
diffusion equation depend on base and collector currents.
Therefore, both of these currents generate the resistive voltage
drop Vae and Rb is placed at the emitter terminal in the IGBT