SIMPLORER User Manual V6.0 - FER-a

13
400 Simulator
Model properties Recommended
What is the smallest controller sampling (TS min)
What is the fastest transient occurrence (TU min ) (edge changes of time
functions)
What is the time interval to be simulated (Tend)
• Select the smallest of each estimated maximum and minimum time step for your simulation
model.
• All the values recommended above are based on numeric requirements and experience
and do not guarantee a successful simulation. Please consider the algorithm as a guideline.
• In case of doubt, decrease the maximum and minimum step size by dividing by 10,
repeat the simulation and compare the results. If the second set of results (with the step
size decreased) shows conformity with the first results, then the step sizes chosen for the
first simulation were appropriate (remember that smaller values increase the simulation
time).
13.1.2 AC Simulation
The AC Simulator is used to calculate the simulation model in the frequency domain. First it
performs a DC simulation to calculate operation point values and then an AC simulation for a
given frequency range. The voltage and current information for the DC simulation and the values
for the AC simulation are saved in one .sdb file. If you open the file in the DAY Post Processor
you can choose between the two results To display gain and phase diagram use the
Bode Plot Element. See also “Bode Plot” on page 377.
Components for AC Simulation
Components for AC simulation in the «Basics» tab:
• Passive Components
• Electrical Sources (except for Fourier source)
• Switches (except for controlled switches)
• Semiconductor System Level
• Semiconductor Device Level
• Spice compatible models
• Transformers
• Continuous Blocks
• Discrete Blocks
Hmin TSmin < --------------
5
Hmax =
TS min
Hmin TUmin < ---------------
20
Hmax TEND
< ----------------
50
If the number of iterations is identical with the defined maximal value (NEWTON) during the
simulation, the model may be incorrect. The simulation monitor displays the active number
of iterations. See also 13.4.1 “Displaying Monitors” on page 412.