The Engineer’s Guide To EMI In DC-DC Converters (Part 2): Noise Propagation And Filtering

Focus:

Understanding the EMI characteristics of high-frequency power converters is essential since the EMI filters required for regulatory compliance typically occupy a significant portion of space within the system. This part 2 article offers insight into dc-dc converter conducted EMI behavior by explaining sources and propagation paths for differential mode (DM) and common mode (CM) conducted emissions and how passive filtering is used to attenuate these noise components. Use of passive and active circuitry for DM and CM noise separation from the total noise measurement is described, and a boost converter example is used to highlight the main CM noise conduction paths in an automotive application.

What you’ll learn:

• How to understand how differential-mode and common-mode EMI noise signals are generated and propagated in dc-dc converters
• How to model, measure and troubleshoot DM and CM EMI noise sources in dc-dc converters

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Author & Publication:

Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Jan 15 2018

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