EMI For Wisdom Seekers (Part 2): Keeping It Simple

by Patrice Lethellier, Noizgon, Salt Lake City, Utah, How2Power Today, Dec 15 2017

Focus:
This series, which explains electromagnetic interference (EMI) to mechanical designers of high- power power supply packaging to help them create standards-compliant designs, continues in part 2 by explaining why the shortest circuit path is not always best for EMI. This 3-page article demonstrates this point with the connection loop of a flyback converter output stage, explaining how a shorter loop can creates a larger area that emits more EMI. It also describes how poor placement of an EMI filter in an enclosure can lead to EMI being coupled onto the input line.

What you’ll learn:

• How to understand the effect of loop area on EMI in power supply circuits
• How to understand the importance of EMI filter placement

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