# PSPICE Transient Analysis - Engineering Circuit Analysis - Lecture Slides, Slides for Electrical Circuit Analysis. National Institute of Industrial Engineering

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These are the Lecture Slides of Engineering Circuit Analysis which includes Units of Volts and Amps, Complex Number, Resistive Component, Series
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Slide 1

PSPICE Transient Analysis

• Circuit to Simulate  TextBook Fig. 7.25

• Two New Parts

– Switch

– Capacitor

• Place Vs, GND, R

• Now Install Cap Using

– Draw

– Get New Part…

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Get Cap Part

• Place, Flip, Twist, and Set Value

NOT Case Sensitive Docsity.com

Get Switch Part

Double Click

Turn Off

Accept Defaults

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Set Cap Initial Condition (IC)

• Just as in MATLAB SimuLink, the Initial Condition MUST be Specified.

• Set the CAP Initial Voltage vc(0

−) = vc(0 +)

• PIN-Numbers and Current Directions

– Current is ASSUMED to ENTER at Pin-1 within SPICE

MUSTEnter IC

Value – To REVERSE a Current

Direction use “Rotate” Twice to Affect a 180° Twist Docsity.com

SET UP Transient Simulation

Click

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PROBE Window

• Simulate the Circuit

Time-Based Graph

Window • Simulating the Circuit

AUTOmatically Opens the PROBE Window

– See 

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Add TRACE to PROBE Graph

Turn OFF

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Add SECOND Y-Axis

• DOUBLE-Click an Axis to “Activate” it for the Addition of the next Trace

Marker for ACTIVE Axis

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Activate V(C1:1) Axis

• Activate the Primary Axis used for vC(t)

– Note change in Grid • Horizontal

GridLines apply to Active Axis which has a TRACE Associated with it

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Add ic(t) to 2 nd Axis

MUST Be Properly Filled-In

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Add ic(t) to 2 nd Axis

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Find Time Const using Cursor

   tC etv  1V10 tWhen

      V32.60.6310V 1V10 1



 evC

 Cv

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HomeWork Presentation

Time

0s 1.0ms 2.0ms 3.0ms 4.0ms 5.0ms 6.0ms 7.0ms 8.0ms

1 V(C1:1) 2 I(C1)

0V

2V

4V

6V

8V

10V 1

0A

2mA

4mA

6mA

8mA

10mA 2

>>

• Paste Result

– PasteSpecial  Enhanced MetaFile

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ReCall Copy Model to ClipBoard

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MSWord HW Example

• TWO Copy-n-Paste Operations

– Model • Mouse-Pointer Window-

Select

• Copy to Clipboard Command

• Default Paste

– Probe Simulation Plot • Copy to Clipboard

Command

• PasteSpecial  Enhanced MetaFile

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P7-95modified

2.7 Ω 2.2 Ω 2.4 Ω

1.5 H 1.2 Ω 4.7 Ω

• 10V Pulse over t = 0 →1 second

– 0V OtherWise

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P7-95  IC analysis

Circuit and Input Pulse

• At DC (t = 0−) – L is SHORT

– C is OPEN

• Then Ckt at t = 0−

By Physics of L & C

2.7 Ω 2.2 Ω 2.4 Ω

1.5 H 1.2 Ω 4.7 Ω

 0Cv +

−  0Li

   across volts0 SHORT 0 tvin

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P7-95  IC analysis

• Examine the t = 0− Circuit • Construct SPICE ckt

– Note that Isrc is SHORTED to GND, so

    A 20V 00   lC iv

 0Cv +

−  0Li

   across volts0 SHORT 0 tvin

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Set Initial Conditions (IC’s)

Cap Initial Condition

• vC(0 −) = 0 Volts

Ind Initial Condition

• iL(0 −) = 2 Amps

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Add the V-Pulse Source

• The Ckt with “Standard” Parts Connected

• Need to Locate a Voltage- Pulse SOURE

– Engage Get New Part and Libraries

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Configure the V-Pulse Source

• The Ckt with Pulse-Part

• Open VPULSE Configuration DiaLog Box with DoubleClick

– Consulting PSPICE Help on VPULSE is useful

First voltage level

2nd voltage level

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Configure the V-Pulse Source

Delay

Rise time

Rise time

Pulse Width

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Configure the V-Source Pulse

Realistic Pulse IDEAL Pulse

Time

0s 0.5s 1.0s 1.5s 2.0s 2.5s 3.0s

V(R3:1,R2:1)

0V

2V

4V

6V

8V

10V

Time

0s 0.5s 1.0s 1.5s 2.0s 2.5s 3.0s

V(R3:1,R2:1)

0V

2V

4V

6V

8V

10V

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Cool Stuff: Marker, Thick Lines

(Oscope) PROBE Markers Thick PROBE Plot-Lines

• RIGHT-Click Plot-Line

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P7-95 Solution  Final Model

• The Circuit Schematic/Model

– Note the V-Probe Marker at vo(t)

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