Power conversion techniques for automotive emissions requirements

Learn about EMI mitigation techniques used in automotive power converters to comply with emissions requirements.

Comité International Spécial des Perturbations Radioélectriques (CISPR) 25 is the typical starting point for evaluating conducted and radiated emissions in automotive systems. This topic addresses the unique challenges of designing power converters to pass CISPR 25 requirements, including background information on the CISPR 25 standard and test setups. We explain common noise sources in power converters and various techniques to reduce conducted and radiated emissions, including input filter design, frequency selection, mode selection, snubber design, shielding and layout. Measured results from a 13.5-V input to a 3.3-V, 5-A output converter case study demonstrate the relative effectiveness of electromagnetic interference (EMI) mitigation techniques and the path to passing CISPR 25 Class 5 conducted emission limits.

Why should I take this training?

  • The techniques used to reduce EMI can also solve other problems that may occur
  • EMI is one of the biggest design challenges that can crop up in almost any system

What will I learn?

  • Sources of EMI in power converters
  • Tricks and techniques to reduce EMI
  • EMI measurement and test procedures
  • Apple to apples comparison of reduction techniques


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