This is an ideal semiconductor which is
open (off), if it is reversed biased (voltage drop
less than 0)
closed (on), if it is conducting (current >
0).
This is the behaviour if all parameters are exactly zero.
Note, there are circuits, where this ideal description with zero
resistance and zero conductance is not possible. In order to
prevent singularities during switching, the opened semiconductor
has a small conductance Gon and the closed semiconductor
has a low resistance Roff which is default.
The parameter Vknee which is the forward threshold
voltage, allows to displace the knee point
along the Gon-characteristic until v =
Vknee.
Please note: In case of useHeatPort=true the
temperature dependence of the electrical behavior is
not modelled.