Variable DC Circuits (Pspice Student Version 9.1) Juan C. Luna

Variable DC Circuits (PSpice Student Version 9.1) Juan C. Luna

Step 0: Open the Program

Select: <Start<Programs<PSpice Student<PSpice Design manager>

In the Design Manager screen select the option: <Tools< Schematics>

This option will open the screen where the user can draw a circuit and perform a simulation

Step 1: Draw the elements of the circuit

If the final circuit is:

DC Voltage varies from -10V to +10V

the user needs to load some libraries to start drawing the elements of the circuit.

Select the Icon <Get New Part>

Select the option <Advanced>.This option will display an enhanced window to load component libraries

The libraries to load will be:

We select the following components:VDC, R and GND_EARTH

All the selected components will appear in a dropdown box

The operations with the components are available in the drop down menu of EDIT

Select the Draw Wire Tool to complete the circuit

Select the View option : <Fit>

Double-Click in any element opens the Attribute window.

The user needs to change the attributes of each element to obtain the final PSpice circuit:

Step 2: Simulation of the Circuit

Select the option: <Analysis<Setup>

Choose the option <DC Sweep> to perform a DC Analysis

Select the range of the DC sweep

Select option: <Simulate>

Step 3: Simulation Plots

The program Schematics transfer control to PSpice A/D, the screen is

To understand how PSpice simulates the circuit open the output file using: <View<Output File>

The output file shows the list of nodes that PSpice uses as a reference for its calculations.

Identify the PSpice nodes of your circuit

Once the variables of interest are identified, the option Trace <Add Trace> will activate the program Probe

The option <Add Trace> asks for the variable to be plotted against the DC Sweep.

Once the variable has been selected, the program Probe will plot the variable against the DC Sweep.

References:

PSpice for Linear Circuits. 2nd Ed. James A. Svoboda

1