1 / 20

INC151 Circuit Analysis by Engineering’s Software Practice

INC151 Circuit Analysis by Engineering’s Software Practice. Lecture 4 Transient Analysis. 2 Types of AC Analysis. Transient Analysis (Transient) Plot of voltage/current vs. time Questions that ask relationship between voltage/current and time Frequency Response Analysis (AC Sweep)

mills
Télécharger la présentation

INC151 Circuit Analysis by Engineering’s Software Practice

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. INC151 Circuit Analysis byEngineering’s Software Practice Lecture 4 Transient Analysis

  2. 2 Types of AC Analysis • Transient Analysis (Transient) • Plot of voltage/current vs. time • Questions that ask relationship between • voltage/current and time • Frequency Response Analysis (AC Sweep) • Plot of voltage/current vs. frequency • Questions that ask relationship between • voltage/current and frequency

  3. More AC Components • L (inductor) has 2 parameters: • value, initial condition (IC) • C (capacitor) has 2 parameters: • value, initial condition (IC) • VSIN (Transient sine voltage source) • Sinusoidal voltage source for transient analysis • has 3 parameters: • offset (VOFF), amplitude (VAMPL), frequency (FREQ)

  4. Example VSIN parameters VOFF = 0 VAMPL = 1 FREQ = 200 Transient mode: Range = 0-100ms (Final time = 100ms) ex10

  5. Choose mode “Transient ” • Graph plotting • Markers – specify which voltage to plot • Add trace – Another way to plot graph • Toggle Cursor – Show graph coordinate • Cursor Peak – Find max/min of the graph Question What is the voltage of the voltage source at t = 47ms?

  6. How PSPICE plot a graph? y = sin(0.25t) t 0 1 2 3 4 5 y 0 0.7071 1.0000 0.7071 0.0000 -0.7071 t 6 7 8 y -1.0000 -0.7071 1.0000

  7. Step Ceiling Step ceiling is the distance between 2 points When you want to read a value from a graph, Your step should be small enough but not too small. Step too big -> Read error Step too small -> Take long time to plot a graph

  8. Try changing step ceiling to 1us 0.1us Step ceiling

  9. Initial Condition (IC) L and C can store energy. They can absorb and supply the energy in form of voltage/current. L has IC in form of current C has IC in form of voltage In PSPICE, if not specify, you should put it equal to zero.

  10. Example ex11 IC = 5V Range = 0-100ms

  11. More Components • VPWL (Piecewise linear voltage source) • Programmable Voltage Source • Has 20 parameters: voltage at different time • IPWL (Piecewise linear current source) • Programmable Current Source • Has 20 parameters: current at different time

  12. Piecewise Linear Source VPWL, IPWL Specify the time and voltage according to the table. 10 values are allowed. t 0 10m 20m 50m y 0 1 2 -1

  13. Example Range 0 – 100ms

  14. Step Input fromVPWL 1v 0v 20ms 0ms Build this signal using VPWL

  15. Example Step Voltage

  16. Example: Change to C IC=0 What is the voltage across the capacitor at t= 50ms?

  17. Switches Sw_tClose switchclose at t Sw_tOpenswitch open at t

  18. Example Range 0 – 100ms

More Related