EMI For Wisdom Seekers (Part 3): Differential Mode Noise Versus Common Mode Noise

by Patrice Lethellier, Noizgon, Salt Lake City, Utah, How2Power Today, Jan 15 2018

Focus:
Having explained why designers of power supply packaging need an understanding of electromagnetic interference (EMI) and introduced the topic in the parts 1 and 2, this part 3 explains the concepts of differential-mode (DM) noise and common-mode (CM) noise—their different causes and different treatments. Tips for reducing CM noise such as reducing voltage swings and limiting parasitic capacitance in power transformers and heatsinks are discussed. Author uses Gimpy, a cartoon character to help explain the concepts. Focus is mostly on CM noise.

What you’ll learn:

• How to understand causes of differential-mode and common-mode noise in high-power power supplies
• How to reduce CM noise in high-power power supplies through package design and other means

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