The Engineer’s Guide To EMI In DC-DC Converters (Part 4): Radiated Emissions

Focus:

Part 4 of this article series offers detailed discussion on radiated emissions of dc-dc converters, with a focus on EMC requirements in industrial and automotive applications. This 14-page article, explains the basic mechanisms responsible for radiated EMI, and discusses the requirements of the EMC standards (such as FCC Part 15 Subpart B, CISPR 22, CISPR 25 and UNECE Regulation 10) which apply to industrial, multimedia and automotive equipment. This article offers practical explanations of the standards requirements, including frequency ranges and emissions limits, and goes into detail on the test equipment setups required (including the antennas) to perform pre-compliance radiated emissions testing. Example test setups and measurement results are presented for two dc-dc buck converters.

What you’ll learn:

• How to perform pre-compliance radiated emissions testing for dc-dc converters intended for use in industrial and automotive applications
• How to understand the coupling mechanisms responsible for radiated emissions in switching power converters
• How to make test setups for measuring radiated emissions

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Author & Publication:

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

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