Pspice program example

AC Analysis. In the Analysis setup dialog box, click on the AC sweep button. For frequency response over a wide range of frequencies you can sweep the following type. Linear Specifies a linear variation. Octave Specifies an octal variation Decade Specifies a decade variation Logarithmic scale. The following parts called Printpoints are available for writing the simulation results to the output files:.

In all of the above Printpoints , you can specify one or more analysis type. To do this double click on the symbol, double click on the analysis type for example AC, and set its value text box to any non-blank value, such as Yes or 1. For multiple frequencies, the results can be viewed graphically using Probe to generates plots of magnitude versus frequency, or plots of phase versus frequency.

To plot the magnitude of a signal in probe, specify V expression or I expression. To plot the phase angle of a signal, specify VP expression. Use the command dB expression to plot a trace in decibels.

Alternatively, you can use special markers to mark one or more variables to be automatically plotted in the Probe. In the Schematic Window, select Markers , Mark Advanced, choose the desired markers from the following, OK, place the marker at the desired location.

Example 9 EEex9. Transforming the voltage source to the current source and writing the node-voltage equation results in. Current in R3 is b EEex9. The following results are extracted from the Output File. In order to obtain the Thevenin's voltage, a high resistance, Rinf is connected across terminal ab. From the Output File, Top of Page. Example 11 eeex11 In the following circuits a single point 60 Hz AC Analysis is set up for an open circuit and a short-circuit conditions to obtain the Thevenin's equivalent circuit.

Determine the resonant frequency. Also draw the 0. Top of Page. The plot produced on the probe is shown below. From the plots we see that the circuit changes from capacitive to inductive at the series resonance frequency where reactive power is zero. Example 3. The line feeds two balanced three-phase loads that are connected in parallel. The line is energized at the sending-end from a 3-phase balanced supply of line to neutral voltage rms , 60 Hz. The line inductance per phase is.

The Y-connected load inductance per phase is. The D -connected load capacitance per phase is. The Schematic and the Netlist are shown in the following pages.

The output files contain the following values for the magnitude and phase angle of currents. From the above results the currents are:.

Determine the magnitudes and phase angles of mesh currents in the coupled circuit shown. PSpice uses the coupling coefficient to describe the coupled coils, thus we find K from. The dot is always next to the first pin to be netlisted.

The dotted terminal is always referred to the first node of the inductor in the Netlist. So always examine the net list and if the left node is not the dotted side, rotate the inductor in the schematic until the desired dotted node is the first entry in the Netlist.

The parameters to be specified are L1, L2, … up to L6, whose values must be set to the inductors symbols. The coupling value is the coefficient of mutual coupling, which must be specified between zero and 1. The PSpice schematics is as shown. From the analysis menu select the Probe Setup, and disable the Probe. Run PSpice Analysis, Simulate. The Schematics Netlist is as follows. The output file contains the following values for the magnitude and angles of the currents.

Example 5. For the circuit shown, use PSpice and Probe to graph the magnitude and phase angle of the output voltage V o , i. Determine the frequency at which the amplitude of the output voltage V o is a maximum; find the phase angle at this frequency. Also, find the frequency at which the impedance seen by the source is purely resistive. The Schematics Netlist is as follows:.

Since the dotted terminal is always the first pin in the Netlist, L1 and L2 are rotated three times such that their corresponding nodes are entered as 2 0, and 3 0 respectively.

In probe, Add Plot from the Plot menu to create two graphs on the screen. Using Add from the Trace menu plot V 4. Select Cursor from the Tools menu, select the Display and use Peak to find the peak voltage. Use Label from the Tools menu and Mark the values at the peak position. Switch the Cursor to phase angle plot and Mark the values at the frequency corresponding to the peak value. Use Cursor and Mark to get the frequencies at 0.

The Probe result is as shown. From the lower graph, the input impedance is purely resistive at frequencies Example 6. Use PSpice and Probe to graph the magnitude of the output voltage V o as a function of frequency. Determine the frequency at which the amplitude of the output voltage V o is a maximum. If bandwidth is the frequency range within 0. Since the dotted terminal is always the first pin in the Netlist, L3 is rotated once such that the corresponding nodes for L1 and L3 are entered as 2 3, and 0 3 respectively.

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