SIMPLORER User Manual V6.0 - FER-a

9
294 Modeling Tools
Component Outputs
Description [Unit] Parameter Name Data Type
Value of the Junction Capacitance VAL real
Polynom of 2nd Order (parabolic)
>>Basics>Tools>Characteristics
V limit stands for the intersection of forward and reverse characteristics and is calculated by the
program itself. The parabolic function is characterized by a very favorable convergence behavior
and thus is well suited for modeling frequently switched systems. There are approximations
which show a good coincidence between model and real components using all three
parameters, a, b and c. In obtaining these parameters, however, special care must be taken
so that only sensible combinations are specified. Parameters a, b and c are freely definable
coefficients. Experience has proven that one should follow these guidelines in determining
the parabolic parameters:
it () A B v() t Cvt ( () ) 2 = + ⋅ + for v() t ≥ Vlimit it ()
vt ()
=
--------- for v() t < V
RR
limit
A = 0 B
Dialog Settings
«Reverse Resistance [Ohm]»
Defines the coefficient reverse resistance. Common parameter type. Enter a numerical value,
a variable, or an expression in the text box.
«Coefficient A/B/C»
Defines the coefficient A, B and C. Common parameter types. Enter a numerical value, a variable,
or an expression in the text box.
Component Parameters
Description [Unit] Parameter Name Data Type
Reverse Resistance [Ohm] RR real
Coefficient A/B/C A/B/C real
Component Outputs
I fav
1
= ------- C
RR
( ) 2
= -------------------- R = 100kΩ
VI fav
Description [Unit] Parameter Name Data Type
Value of the Polynom VAL real