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EMC Modeling of IGBT Motor Controller

EMC Modeling of IGBT Motor Controller. University of Missouri-Rolla & Rose-Hulman Institute of Technology Departments of Electrical and Computer Engineering. RHIT Daniel Baker Andrew Gawlik Gareth Shields Chris Valenta Dr. Ed Wheeler. UMR Matt Halligan Igor Izyumin Clint Patton

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EMC Modeling of IGBT Motor Controller

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  1. EMC Modeling of IGBT Motor Controller University of Missouri-Rolla & Rose-Hulman Institute of Technology Departments of Electrical and Computer Engineering RHIT Daniel Baker Andrew Gawlik Gareth Shields Chris Valenta Dr. Ed Wheeler UMR Matt Halligan Igor Izyumin Clint Patton Jason Phillips Dr. Jim Drewniak

  2. The Problem • IGBT motor drive has fast switching and a PCB coupling path to the cables and motor. • EMI challenges due to the fast switching and various coupling paths need to be addressed.

  3. Objectives and Benefits • Technical • Determine EMI coupling paths • PSpice model IGBT • Cable and motor model with and without ferrites • EMI mitigation possibilities • Knowledge transfer • EMI diagnostic procedures • Numerical modeling for EMC purposes

  4. Model Paradigm

  5. IGBT Module Switch Mode Power Supply PCB Coupling Path to Cables & Enclosure IGBT Model & Parasitics Motor and Cables RHIT Gareth Shields Chris Valenta UMR Igor Izyumin Jason Phillips UMR Clint Patton RHIT Daniel Baker Andrew Gawlik UMR Matt Halligan Team Organization

  6. Work Flow

  7. IGBT Characterization • IGBT module • Main source of EMI • Parameters of interest • Substrate permittivity • Area fill capacitance to heatsink • Area-to-area capacitance negligible • Loop inductance

  8. IGBT Substrate Properties • Prepared material sample • Measurements • Capacitance • Plate area • Thickness • Computed εr estimate for use in simulations

  9. Area Fill Measurements • Sample with bond wires removed • Capacitance measured with impedance analyzer

  10. Area Fill Measurements Capacitance: 58.8 pF

  11. Area Fill Simulations • CST Microwave Studio • Recreated area fills from measurements • Used previously measured material properties • Neglecting silicone gel • Fringing fields included Port Calculated C: 58.7 pF

  12. Measured vs. Simulated Values PRELIMINARY DATA

  13. Loop Inductance • Work in progress • Process • Extract current loops • Measure inductance values • Perform simulations Port Shorted

  14. Next Steps • Area fill capacitance • Verify measurements • Create parasitic model • Loop inductance for critical current paths • Simulation in CST Microwave Studio • Measurement • Build circuit model of IGBT module with parasitics

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