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ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 38

ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 38. 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

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ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 38

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  1. ELECTRIC CIRCUITSECSE-2010Spring 2003Class 38

  2. 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)

  3. 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)

  4. REVIEW V I

  5. REVIEW

  6. NOTES ON RESONANCE • In “real” circuits, often do not have a “pure” Series or pure Parallel situation: • Inductors always have Rw • 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

  7. ACTIVITY 38-1

  8. ACTIVITY 38-1a

  9. ACTIVITY 38-1a

  10. ACTIVITY 38-1a

  11. ACTIVITY 38-1a

  12. ACTIVITY 38-1b

  13. ACTIVITY 38-1b

  14. ACTIVITY 38-1b

  15. ACTIVITY 38-1c

  16. 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)

  17. 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

  18. 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

  19. 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

  20. AC PSPICE • .acStatement: .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

  21. 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

  22. ACTIVITY 38-2

  23. ACTIVITY 38-2 • Similar to Activity 38-1: • Not a “Pure” Parallel Resonant Circuit • Inductor has Winding Resistance • Want to see how this affects Resonance • Let Rw = 10-9 ~ 0, 2 ohms • When Rw = 0, fo ~ 8 kHz, Qparallel ~ 10 • See what happens when Rw = 2 ohms • Let’s Practice using Schematics

  24. ACTIVITY 38-2

  25. ACTIVITY 38-2 • Need to Set X Axis to Linear: • Probe automatically uses a Log scale • Go to Plot, X Axis Settings, Linear • To Look at Amplitude/Magnitude: • Plot Vm(1)@1 or Im(C)@1 • Amplitude/Magnitude of the Voltage at Node 1 for Case 1 (Rw = 10-9 ohms) • To Look at Angle/Phase: • Plot Vp(1)@2 or Ip(C)@1 • Angle/Phase of the Voltage at Node 1 for Case 2 (Rw = 2 ohms)

  26. ACTIVITY 38-2 • With RW = 10-9 Ohms: • f0=7.985 kHz • iC,max = 10 Amps • Qparallel = 10 • With RW = 2 Ohms: • f0 = 8.225 kHZ • iC,max = 3.47 Amps • Qparallel = 3.47 • Change f0 a little • Reduce Qparallel a lot:

  27. COMPUTER PROJECT 5

  28. COMPUTER PROJECT 5 • 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

  29. 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: Zin = Vin / Iin • Vin = Volts • => Yin = Iin /1 Siemons

  30. COMPUTER PROJECT 5

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