eel 5245 power electronics i lecture #5: examples pspice ...fpec.ucf.edu/teaching/eel 5245...
TRANSCRIPT
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EEL 5245 POWER ELECTRONICS I
Lecture #5: Examples
PSPICE Refresher (Dr. Chris Iannelo)
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Discussion Topics
• Exercise 2.2 and Problem 2.7 Solutions • PSPICE Overview
– PSPICE Websites • www.pspice.com • www.orcadpcb.com • www.cadencepcb.com/products/downloads/default.asp
– 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)
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Discussion Topics
• Exercise 2.2 Exact Solution
• Problem 2.7
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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
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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
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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
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Buck with no Low Pass Filter Transient Simulation
Time 0s 10us 20us 30us 40us
V(Rload:1) V(Control) 0V
10V
20V
30V
Time 0s 10us 20us 30us 40us 1 V(Rload:1) 2 V(Control)
0V
10V
20V
30V 1
0V
0.5V
1.0V 2
>>
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Buck with no Low Pass Filter FFT
Frequency 0Hz 200KHz 400KHz 502KHz
V(Rload:1) 0V
5V
10V
15V
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Buck with no Low Pass Filter Model Parameters of Sbreak
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Buck with no Low Pass Filter PSPICE Generated Files
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Buck with no Low Pass Filter Alias File
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Buck with no Low Pass Filter Circuit File
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Buck with no Low Pass Filter Library and Netlist File
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Buck with no Low Pass Filter Probe file
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Buck with no Low Pass Filter Adding a Library File
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Buck with no Low Pass Filter Adding a Symbol Library
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Buck with no Low Pass Filter The nom.lib File
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Buck with no Low Pass Filter Complex Parts in Eval *.lib files
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Homework Example 2.3 Unusual WaveShapes
Time 0s 5us 10us 15us 20us
V(R1:1) RMS(V(R1:1)) -20V
0V
20V (20.000u,6.9309)
Time 0s 20us 40us 60us
V(R1:1) -20V
0V
20V
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Homework Example 2.3 Unusual WaveShapes- Diode Implementation
Time 8.00us 12.00us 4.54us 15.97us
V(Vo_Dbreak) V(Vo_Sbreak)
0V
5.0V
10.0V 12.7V
Time 14.600us 14.800us 15.000us
V(Vo_Dbreak) V(Vo_Sbreak)
0V
125mV
250mV
375mV
-96mV
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Homework Example 2.3 Unusual WaveShapes- Diode Implementation
Time 8.00us 12.00us 4.55us 15.85us
V(Vo_Dbreak) V(Vo_Sbreak) 0V
5.0V
10.0V 12.6V
Time 14.4us 14.6us 14.8us 15.0us
V(Vo_Dbreak) V(Vo_Sbreak)
0V
200mV
400mV 506mV
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Buck Converter (Step Down) CCM Open Loop Simulation
Time 0s 5ms 10ms
V(Output) I(L1) 0
12.5
25.0
37.5
50.0
Time 9.85ms 9.86ms 9.87ms 1 I(L1) 2 V(L1:1,L1:2)
1.5A 2.0A 2.5A 3.0A 1
0V
20V
-32V
2
V(Output) 24.4313V 24.4375V 24.4438V
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Buck Converter (Step Down) CCM using Capture as Editor
+ -
+ -
S1
VOFF = 0.0VVON = 1.0V
ROFF = 1e6RON = 1p
Vpulse
PER = 10usPW = 5us
TF = .1nsTR = .1ns
+-
DbreakD1
Cf100uF
IC = 0V
RLoad10
Vin50V
+
-
L
750u
IC = 0A Output
Gate
Gate
99.88pV50.00V 49.95V
0V
VI
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Buck Converter (Step Down) CCM using Capture as Editor
• Library setup in Capture
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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
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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.
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