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EMC Modeling of AC Drive Chris Valenta. Rose-Hulman Institute of Technology & Missouri University of Science & Technology Departments of Electrical and Computer Engineering. MS&T Matt Halligan Igor Izyumin Clint Patton Jason Phillips Dr. Jim Drewniak. RHIT Daniel Baker Gareth Shields

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emc modeling of ac drive chris valenta

EMC Modeling of AC DriveChris Valenta

Rose-Hulman Institute of Technology

&

Missouri University of Science & Technology

Departments of Electrical and Computer Engineering

MS&T

Matt Halligan

Igor Izyumin

Clint Patton

Jason Phillips

Dr. Jim Drewniak

RHIT

Daniel Baker

Gareth Shields

Chris Valenta

Dr. Ed Wheeler

the problem
The Problem

Electromagnetic Interference (EMI) in AC motor drive

Fast switching currents in insulated gate bi-polar transistor (IGBT) module

PCB coupling paths to the cables and motor

Causes device failure

Meet government limits

Costly to diagnose late in design cycle

COUPLING PATH

Cables

IGBT

objectives
Objectives

Create a circuit model (SPICE) of the EMI coupling paths in the drive including:

the IGBT package (L and C)

the cables and motor measurements and modeling

Shielded & unshielded cable

Ferrites

Document and demonstrate the processes involved for EMC design

Demonstrate mitigation opportunities for EMC design and discovery

slide4

IGBT Modeling

  • Intended current paths
    • Shown in schematic
  • Non-intended current paths
    • Parasitic values determined by device geometry
      • Capacitance
      • Inductance
slide5

IGBT Capacitance Modeling

  • Area fill to heat sink
    • Parallel plate capacitor model
  • Area fill to area fill
    • <10% of smallest area fill to heat sink capacitance
  • Constructed regions in CST Microwave Studio
slide6

IGBT Measurement

C = 39.4 pF

slide7

IGBT Capacitance Modeling

  • Measurements consistent with simulations
  • Error caused by additional parasitics to other regions
slide8

IGBT Inductance Modeling

  • Phase leg loop total inductance values desired
  • Simulation results to be placed in equivalent circuit
igbt inductance simulation and verification
IGBT Inductance Simulation and Verification

Simulated

13.1nH

Measured

13.3nH

slide12

Lprobe

CafA,LafA

Lb2

CafG

LafG

Lb1

CafI,LafI

IGBT Partial Inductance

slide14

Motor and Cable Measurements

  • Built test setup for measurements
    • Impedance Analyzer
    • Network Analyzer
    • Time Domain Reflectometer (TDR)
  • Determine transmission line model of cable
  • Create high frequency model of motor
  • Characterize effectiveness of ferrites
motor model
Motor Model
  • Initially modeled motor as capacitor
    • Poor data fit
  • Used high frequency model from Schinkel et. al.
    • Took common and differential mode measurements
references
References

Mohan, Undeland, and Robbins, Power Electronics: Converters, Applications and Design, New York: Wiley, 1989.

Pak, T.T., “EMI Investigation of a Hybrid Electric Vehicle Traction Drive.” Masters Thesis, University of Missouri-Rolla, 2000.

Schinkel, M., Guttowski, S., and John, W., “Efficient HF Modeling and Model Parameterization of Induction Machines for Time and Frequency Domain Simulations,” Applied Power Electronics Conference and Exposition, 2006. APEC ‘06. Twenty-First Annual IEEE, pp. 6, Mar. 2006.

questions
Questions?

Christopher Valenta – [email protected]

Daniel Baker – [email protected]

Gareth Shields – [email protected]

Dr. Ed Wheeler –[email protected]

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