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© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
EMI/EMC Design Applications
Mark ChristiniLead Application EngineerANSYS Inc
Juliano Fujioka MologniLead Application EngineerESSS - Brazil
© 2010 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary
Outline
Introduction
ANSYS Technology for EMI/EMC
Case Study 1 “Simulating EMI/EMC Effects for High Power Inverter Systems”
Case Study 2 “EMI Modeling and Characterization of the Rhino SMPS”
Case Study 3 “Car EMI Interference Cases” by FIAT Brazil
© 2010 ANSYS, Inc. All rights reserved. 3 ANSYS, Inc. Proprietary
Introduction
• EMI/EMC– Magnetic Field– Electric Field– Conducted Fields– Radiated Fields– Testing and solutions– Simulation is solving EMI/EMC problems both
quantitatively and qualitatively
“Electronics is outpacing the basic construction of these boards . . . we’re going to have to change how we do things.” - Paul Huray, Ph.D.
Professor of Electrical Engineering, University of South Carolina
© 2010 ANSYS, Inc. All rights reserved. 4 ANSYS, Inc. Proprietary
ANSYS Technology for EMI/EMC
• EM physical design• Parasitic extraction• Conducted EMI• Radiated Emissions• System Simulation
ElectronicsElectromechanical
© 2010 ANSYS, Inc. All rights reserved. 5 ANSYS, Inc. Proprietary
Alstom High Power Inverter
Case Study #1
© 2010 ANSYS, Inc. All rights reserved. 6 ANSYS, Inc. Proprietary
• Excerpts from Ansoft Workshop, Inspiring Engineering- “Simulating EMI/EMC Effects for High Power Inverter
Systems”- Emmanuel Batista; Alstom Pearl, Vincent Delafosse, Ryan
Magargle; Ansoft Corporation
• The physical quantities in the inverter that need accurate simulation are:
- Quantity of current going through the conductors- Frequency dependent parasitics (RLC) between
conductors - IGBT characterization curves- Power dissipation- Emitted fields
Alstom High Power Inverter Case Study #1
© 2010 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary
IGBT Module Pack 3D accurate model
Parameters Extraction
Electromagnetic (EM) study
Design and Couplings Model
IGBT Model
• Tridimensional IGBT pack model and EM study
• Parasitic model extraction
• IGBT circuit model
Far Field Study
• Far Field Study for Electric Field EM
System Configuration
© 2010 ANSYS, Inc. All rights reserved. 8 ANSYS, Inc. Proprietary
Different modeling techniques are integrated
• Tridimensional IGBT pack model and EM study
• Parasitic model extraction
• IGBT circuit model
• Far Field Study for Electric Field EM
Finite Element Method
Finite ElementMethod
FEA / BoundaryElement Method System Simulation
Analysis Methodology
© 2010 ANSYS, Inc. All rights reserved. 9 ANSYS, Inc. Proprietary
SheetScan
IGBT Charaterization
© 2010 ANSYS, Inc. All rights reserved. 10 ANSYS, Inc. Proprietary
E-field @ 100 MHz, Power = 10kW
Simplorer / HFSS Simulation
© 2010 ANSYS, Inc. All rights reserved. 11 ANSYS, Inc. Proprietary
Rockwell SMPS Conducted EMI
Case Study #2
© 2010 ANSYS, Inc. All rights reserved. 12 ANSYS, Inc. Proprietary
Rockwell SMPS Conducted EMICase Study #2
• Excerpts from presentation at Ansoft Workshop, Leading Insight– “EMI Modeling and Characterization of the Rhino SMPS” – Carson Baisden, Rangarajan M. Tallam, Gary L. Skibinski:
Rockwell Automation
• Goal: Characterize and reduce EMI emissions from Flyback SMPS– Model SMPS– Determine critical components in system– Determine noise attenuating techniques
• Procedure– Model: Actives and Passives (discrete components and interconnects)– Use simulations to find critical paths– Focus attention on these paths to mitigate noise
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 13 ANSYS, Inc. Proprietary
Modeling Process
• Model all passive components including transformer with shields
• Model active components from datasheet
• Create geometric model in Q3D and solve
• Create and solve transient model in Simplorer with LISN
• Perform FFT to verify
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 14 ANSYS, Inc. Proprietary
• Create geometric model in Q3D– Import using interface tool
• Define materials• Define boundary conditions
– Conductors (Nets) to solve the capacitance between
– Terminals (Sources/Sink) solve resistance and inductance
• Solve (C, R, L)• Post Processing
– Export lumped parameters– Matrix Reductions– Field plots
Parasitic Extraction
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 15 ANSYS, Inc. Proprietary
Parasitic Extraction
• Capacitance Matrix(30 min)
– 1 >10pF– 11 5-10pF– 24 1-5pF– 428 <1pF
• Inductance Matrix: R,L,M(30 min)
– 63 Paths (23 Pri & 40 Sec)– 31 Paths (16 Pri & 25 Sec)
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 16 ANSYS, Inc. Proprietary
Transformer Shielding
• Where/how to physically place shield
• Where to electrically connect shield
• Size and cost of shield
Add Shield
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 17 ANSYS, Inc. Proprietary
• Blue elements are input from Q3D and are turned on/off
• 2ns step, 4ms end time• Obtain time domain
solution, voltages in LISN
• Perform FFT for common mode and differential mode EMI
System Simulation
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 18 ANSYS, Inc. Proprietary
Simulated vs Measured Voltage
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
SimulatedMeasured
SimulatedMeasured
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Reduction of Conducted EMI
Copyright © 2006 Rockwell Automation, Inc. All rights reserved.
© 2010 ANSYS, Inc. All rights reserved. 20 ANSYS, Inc. Proprietary
FIAT Car EMI Interference
Case Study #3
© 2010 ANSYS, Inc. All rights reserved. 21 ANSYS, Inc. Proprietary
EMC/EMI Automotive Success Stories by Fiat Brazil
http://www.saebrasil.org.br/eventos/congresso2010/
© 2010 ANSYS, Inc. All rights reserved. 22 ANSYS, Inc. Proprietary
Full Vehicle EMC / EMI
Understand the emission and susceptibility for devices in cars.– Today 35% of an automobile’s cost is in electronic components.– Electromagnetic Compatibility (EMC) is a critical aspect of the automotive
design.– Predicting EMC performance via modeling and simulation allows for further
cuts in design cost and time and robust engineering.– Vehicles are large and complex and in the past automakers needed to rely on
simplified models, so the question is:
Is it possible to simulate an entire vehicle?
© 2010 ANSYS, Inc. All rights reserved. 23 ANSYS, Inc. Proprietary
Full Vehicle EMC / EMI
Spark Plug Fields on PT Cruiser
85.00 90.00 95.00 100.00 105.00 110.00Freq [MHz]
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
Volta
geA
tFM
Por
t
Ansoft Corporation HertzianDipoleXY Plot 2Curve Info
VoltageAtFMPort98MHz : FMband
Some distortion from pattern of ideal
groundplane
More distortion from pattern of ideal
groundplane
Even More distortion from pattern of ideal
groundplane
Voltage induced on FM antenna
GPS Antenna Positioning
© 2010 ANSYS, Inc. All rights reserved. 24 ANSYS, Inc. Proprietary
Wiring Harness
Cell Phone PCB
ELECTRIC FIELD PLOT DUE TO PCB
21
3
FULL VEHICLE EMC ANALYSIS (VEHICLE NOT SHOWN HERE DUE TO CONFIDENTIALITY) AND A CELL PHONE PCB EMI IS SIMULATED. THE INTERFERENCE OF THE CELL PHONE ON THE WIRING HARNESS PLACED IN THE DOOR WAS SUCESSIFULLY STUDIED.
EMC/EMI Automotive Success Customer Stories in Brazil - FiatCell Phone EMI on car doorwiring harness
© 2010 ANSYS, Inc. All rights reserved. 25 ANSYS, Inc. Proprietary
HFSS + Designer + SIwave: Shielding and EMC Analysis
Dynamically link SIwave to HFSS to plot the field strengths around the
enclosure
SIwave field solution can be used as a radiation source for HFSS
• Radiated Emissionis affected by theexternal Housing
Designer circuit excites Siwave PCB
• RadiatedEmissionfrom thePCB only
© 2010 ANSYS, Inc. All rights reserved. 26 ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved. 26 ANSYS, Inc. Proprietary
EMI between Radio and GPS locator
© 2010 ANSYS, Inc. All rights reserved. 27 ANSYS, Inc. Proprietary
Conclusion
• Simulation is an extremely effective method to predict EMI/EMC problems in power systems and will reduce costly prototyping and testing cycles
ANSYS technology provides the most comprehensive state-of-the-art EMI/EMC solution in the industry
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