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ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 38
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ASSIGNMENTS DUE Today (Tuesday/Wednesday): Will do Computer Project #5 in Class (CP-5) Activities 38-1, 38-2 (In Class) Thursday: Experiment #9 Report Due Activities 39-1, 39-2 (In Class) Next Monday: Homework #14 Due Experiment #10 Report Due Computer Project #5 Report Due Activity 40-1, Experiment 11 (In Class)
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FINAL EXAM Wednesday, May 7 8 - 11 am Sage 3303 for All Sections 2-8 1/2 x 11 inch Crib Sheets Laplace Tables Will Be Included with the Final Exam Students with Conflict should Notify Prof. Jennings (jenniw@rpi.edu)
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REVIEW VI
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NOTES ON RESONANCE In “real” circuits, often do not have a “pure” Series or pure Parallel situation: Inductors always have R w Elements may not all be in series or parallel Will still have Resonance, but at a slightly different Resonant Frequency May have Multiple Resonances in same Circuit Define Resonance as when X (series-like circuit) or B (parallel-like circuit) => 0 Let’s do a problem => Activity 38-1
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ACTIVITY 38-1
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AC PSPICE Now want to simulate AC Circuits using PSpice: AC Sources C’s and L’s Usually want to look at behavior as a function of Frequency: AC Sweep (Schematics).ac Statement (Circuit file)
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AC PSPICE-CIRCUIT FILE AC Voltage Source: V 1 0 AC 10 AC Current Source: I 0 1 AC 3 Do Not have to designate frequency when specifying source: Do later with.ac statement
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AC PSPICE-SCHEMATICS AC Voltage Source: Use VAC Doubleclick on VAC Designate Amplitude and Phase AC Current Source with Schematics: Use IAC; Designate same as VAC Do Not have to designate frequency when specifying source: Do later with AC Sweep in Analysis
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AC PSPICE Capacitors/Inductors: C 1 0 2u L 1 0.1m Start “name” with C or L Connected between nodes 1 and 0 (+, -) C = 2 uF; L =.1mH Do Not need Initial Conditions for AC Steady State Use IC’s when doing Transient Analysis Doubleclick C and L in Schematics to set Values and IC’s
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AC PSPICE. ac Statement:. ac lin 400 10 16k Perform AC Sweep (Sweep AC frequencies) Perform a linear sweep (will do decade sweeps later) Divide frequency range into 400 points starting frequency = 10 Hz (note: f) ending frequency = 16 kHZ
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AC PSPICE In Schematics: Doubleclick Set Up Analysis Choose AC Sweep and Doubleclick Choose Type of Sweep Choose Start and End Frequencies Choose Number of Points Remember PSpice uses Frequencies in Hz
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ACTIVITY 38-2
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Similar to Activity 38-1: Not a “Pure” Parallel Resonant Circuit Inductor has Winding Resistance Want to see how this affects Resonance Let R w = 10 -9 ~ 0, 2 ohms When R w = 0, f o ~ 8 kHz, Q parallel ~ 10 See what happens when R w = 2 ohms Let’s Practice using Schematics
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COMPUTER PROJECT 5
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Circuit is both “Series-like” and “Parallel-like”: Will have both Series and Parallel Resonances Resonances occur at different frequencies Identify by Minimum or Maximum of /Z/ /Z/ is a Minimum at Series Resonance /Z/ is a Maximum at Parallel Resonance
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COMPUTER PROJECT 5 PSpice wants frequencies in Hertz: Project asks to sweep Must convert = 2 f Plot as function of = f * 6.28 Use Linear X Axis Note: Z in = V in / I in V in = Volts => Y in = I in /1 Siemons
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