SIMPLIS Multi-step Parameter Analysis

A half-wave rectifier circuit taken from the SIMPLIS Reference Manual provides an example of multi-step parameter analysis. To set up the system to repeat the analysis three times while varying the load resistor, R3, follow these steps:

1. Open the schematic example1.sxsch.
2. To define the value of R3 as an expression relating to a parameter, select and right click on R3 and from the pop-up menu, select Edit/Add Properties.
3. In the Edit Properties dialog box, double click VALUE and change the current value to the following:

   {r3_value}

   Note: You could also use R3.
4. Click Ok twice to return to the schematic.
5. From the menu bar, select Simulator > Setup Multi-step....
6. Enter the following values as shown below:
   • Parameter name = r3_value
   • Step Type = Linear
   • Start value = 20
   • Stop value = 100
   • Number of steps = 3
   
7. Click Run.
   Result: Three simulations are run using the simulation directives setup defined in the Choose Analysis dialog. Each simulation uses a different resistance value for R3. The resistance values are defined as a linear sweep from 20 to 100 with 3 steps. The waveform viewer opens and displays the output curves:
   
   Note: The analysis is repeated three times for the specified values of r3_value: 20, 60 and 100. The resistor value R3 is defined in terms of r3_value which steps R3 through that range.

   In most cases, you will step just one part in a similar manner as described above, but you can also use the parameter value to define any number of part values or model values.

   If you now run a normal single analysis, you will find that SIMPLIS reports an error because it is unable to resolve the value for R3. This can be overcome by specifying the value using a .VAR control.

8. In the F11 window, add the following line to define the value of R3 when a normal single step analysis is run:

   .VAR r3_value=100