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Introduction to Electromagnetic Interference and Compatibility (EMI/EMC) and Best Practices

November 16, 2020 - November 19, 2020

Course Overview

Learn about Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC), including best practices and a building-block approach with application-specific examples.

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Who Should Attend?

  • Electrical engineers
  • Mechanical design engineers
  • System engineers
  • Project engineers
  • System integrators
  • Program managers
  • Technical leaders

Course Outline

Introduction – Examples of EMI/EMC Considerations

  • Power electronic circuits (inverters and DC/DC converters)
  • Hybrid electric vehicles and plug-in electric vehicles
  • Appliances and computers

EMI/EMC Background

  • Emissions and susceptibility
  • Important electromagnetic laws

EMI Specifications and Standards

  • Emission regulations (DO 160, FCC, CISPR)
  • Susceptibility regulations (DO 160, IEC)

Path of Lowest Impedance

  • Examples of high frequency current flow
  • Review of current paths

Noise Coupling Mechanisms

  • Four types of noise coupling

Common Impedance Coupling

  • Circuits sharing electrical connections

Magnetic Coupling

  • Meaning of Faraday’s Law
  • Understanding magnetic fields
  • Equivalent circuit of magnetic coupling

Electric Field Coupling

  • Electric and magnetic field comparison
  • Equivalent circuit for electric field coupling

System and Board Layout Issues

  • Power bus decoupling
  • Return (ground) planes
  • Board layout priorities and board level concerns
  • Common susceptibility problems

Electromagnetic Coupling (Radiation)

  • Characteristics of radiation
  • Dipole antenna characteristics
  • Characteristics of unintentional radiators


  • H-field shielding and skin depth
  • Electric field shielding


  • Seam bonding and faying surfaces
  • Bonding methods


  • Signal grounds
  • Single and multiple point grounds, hybrid grounds
  • Signal reference subsystem
  • Equipment and facility grounding


  • Specification
  • Test methods
  • Indirect and direct effects


  • Models
  • Common mode filtering, differential mode filtering
  • Low-pass, high-pass, band-pass filtering
  • Signal filter design techniques
  • Filter damping

Shielding Practical Considerations

  • Cabinet and enclosure design
  • Cables and connectors
  • EMI gaskets
  • Slots and seams

Antennas for EMC

  • Antennas for emissions and for susceptibility
  • Monopole and biconical antennas for EMI tests

Best Practices to Pass EMI Tests

  • Design practices for passing EMI qualification tests
  • Conducted and radiated emissions and susceptibility

System Issues Excited by AC Drive CM and DM voltages

  • Motor over-voltages
  • Bearing damage

Effect of High Frequency CM and DM on Application Hardware

  • Sensors
  • Plant equipment/protection
  • Mitigation

Effect of High Frequency CM and DM on Control/Protection Components

  • Drive sensor characteristics
  • Current sensing

Influence of High Frequency on Power Device Switching Dynamics

  • IGBT behavior and performance
  • Voltage measurement/observers
  • Mitigation


November 16, 2020
November 19, 2020
Event Category:


Madison, WI United States + Google Map


Prof. Bulent Sarlioglu