The Engineer’s Guide To EMI In DC-DC Converters (Part 13): Predicting the Common-Mode Conducted Noise Spectrum

by Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Jun 15 2020

Focus:
Part 12 of this series reviewed the DM noise spectrum and streamlined models to predict it, at least from a low-frequency standpoint as it pertains to DM filter design. The analysis considered the converter and passive EMI filter stage as well as the measurement equipment, specifically the line impedance stabilization network (LISN) and the EMI test receiver. Part 13 now takes a similar approach for the CM conducted noise spectrum, again referring to the behaviors of the converter, the passive EMI filter and the LISN. However, one difference in simulating the CN noise spectrum is that the converter CM noise source is modeled as a voltage source rather than as a current source as used to predict the DM noise spectrum.

What you’ll learn:

• How to predict the common-mode conducted EMI spectrum produced by dc-dc converters
• How to model dc-dc converters, passive EMI filters, LISNs and EMI test receivers to predict differential-mode noise produced by the converters
• How to model a dc-dc converter as a CM noise source

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