EEL 5245 POWER ELECTRONICS I Lecture #5: Examples PSPICE Refresher (Dr. Chris Iannelo)

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1 EEL 5245 POWER ELECTRONICS I Lecture #5: Examples PSPICE Refresher (Dr. Chris Iannelo)

2 Discussion Topics Exercise 2.2 and Problem 2.7 Solutions PSPICE Overview PSPICE Websites Any special libraries needed (if there are any) will be posted to the WebCT website PSPICE File types *.SCH, *.LIB, *.SLB, *.CIR (SCHEMATICS EDITOR) *.OPJ, *.LIB, *.OLB, *.CIR (CAPTURE EDITOR)

3 Discussion Topics Exercise 2.2 Exact Solution Problem 2.7

Discussion Topics Schematic Definition done in one of two editors provided: Schematics or Capture In class examples use Schematics editor (you can use either Schematics or Capture as your editor of

4 Discussion Topics Schematic Definition done in one of two editors provided: Schematics or Capture In class examples use Schematics editor (you can use either Schematics or Capture as your editor of choice) Schematics often easier to use Capture editor has more built in functions Both create similar but slightly different text files (netlists and *.cir files) for pass off to the PSPICE A/D Engine. PSPICE Engine has integrated display called PROBE for results viewing

Discussion Topics Schematics Front end Overview of Simulation Types Transient, Bias Point, AC Model Parameters (Model Editor and Attributes entry) Library

5 Discussion Topics Schematics Front end Overview of Simulation Types Transient, Bias Point, AC Model Parameters (Model Editor and Attributes entry) Library Configuration (Symbol, Model, Include) Cut and Past Operations from PSPICE for Submission and/or presentation Parts of Interest Diode Options SBreak DBreak Sources VPulse

6 Discussion Topics Ideal Switch Sw_tclose, Sw_topen, SBreak ABM Parts GValue, GTable, EValue, ETable Real World Parts in Eval Library Diode Implementation Marker Types Polarity in Schematics Append Functions in Probe Probe Setup Options Convergence Tips and Tricks Virtual Snubber reltol=.01

7 Buck with no Low Pass Filter Transient Simulation 30V 20V 10V 0V 0s 10us 20us 30us 40us V(Rload:1) V(Control) Time 1 30V 2 1.0V 20V 10V 0.5V 0V >> 0V 0s 10us 20us 30us 40us 1 V(Rload:1) 2 V(Control) Time

8 Buck with no Low Pass Filter FFT 15V 10V 5V 0V 0Hz 200KHz 400KHz 502KHz V(Rload:1) Frequency

9 Buck with no Low Pass Filter Model Parameters of Sbreak

10 Buck with no Low Pass Filter PSPICE Generated Files

11 Buck with no Low Pass Filter Alias File

12 Buck with no Low Pass Filter Circuit File

13 Buck with no Low Pass Filter Library and Netlist File

14 Buck with no Low Pass Filter Probe file

15 Buck with no Low Pass Filter Adding a Library File

16 Buck with no Low Pass Filter Adding a Symbol Library

17 Buck with no Low Pass Filter The nom.lib File

18 Buck with no Low Pass Filter Complex Parts in Eval *.lib files

19 Homework Example 2.3 Unusual WaveShapes 20V 0V -20V 0s 20us 40us 60us V(R1:1) Time 20V (20.000u,6.9309) 0V -20V 0s 5us 10us 15us 20us V(R1:1) RMS(V(R1:1)) Time

20 Homework Example 2.3 Unusual WaveShapes- Diode Implementation 12.7V 10.0V 5.0V 0V 4.54us 8.00us 12.00us V(Vo_Dbreak) V(Vo_Sbreak) Time 15.97us 375mV 250mV 125mV 0V -96mV us us us V(Vo_Dbreak) V(Vo_Sbreak)

21 Homework Example 2.3 Unusual WaveShapes- Diode Implementation 12.6V 10.0V 5.0V 0V 4.55us 8.00us 12.00us V(Vo_Dbreak) V(Vo_Sbreak) Time 15.85us 506mV 400mV 200mV 0V 14.4us 14.6us 14.8us 15.0us V(Vo_Dbreak) V(Vo_Sbreak) Time

22 Buck Converter (Step Down) CCM Open Loop Simulation s 5ms 10ms V(Output) I(L1) Time V V 1 3.0A 2.5A 2.0A 1.5A V V(Output) 2 20V 0V -32V 9.85ms 9.86ms 9.87ms 1 I(L1) 2 V(L1:1,L1:2) Time

23 Buck Converter (Step Down) CCM using Capture as Editor S1 I V L IC = 0A Output Vin 50V - + Gate Dbreak D1 750u Cf 100uF IC = 0V RLoad 10 VON = 1.0V VOFF = 0.0V ROFF = 1e6 RON = 1p Gate + - Vpulse 50.00V 49.95V PW = 5us PER = 10us0V TF =.1ns TR =.1ns

24 Buck Converter (Step Down) CCM using Capture as Editor Library setup in Capture

$ini file from Schematics (often in C: \windows directory) Can often use an ini that s not the original but requires user to$

25 Project Conversion Schematic files to Capture Files Requires some effort Need original *.ini file from Schematics (often in C: \windows directory) Can often use an ini that s not the original but requires user to modify the pspice.ini for the new front-end

26 PSPICE Case Study: Hubble Telescope Design Attached is excellent example of how PSPICE can do both electronics level and system level simulations Note how the authors use time scaling such that Simulation time 596 seconds on PC PSPICE Time Span 1.8 seconds Physical Time Span 1.8*10000 seconds=5 hours To improve the Pspice simulator convergence for multiple orbit runs, time is divided by 10000, resulting in a 96 minute orbit equal to 576 milliseconds, and a 60 minute daytime duration of 360 milliseconds.

EXPERIMENT 9 Problem Solving: First-order Transient Circuits

EXPERIMENT 9 Problem Solving: First-order Transient Circuits I. Introduction In transient analyses, we determine voltages and currents as functions of time. Typically, the time dependence is demonstrated