The Engineer’s Guide To EMI In DC-DC Converters (Part 12): Predicting The Differential-Mode Conducted Noise Spectrum

Focus:

Custom-designed passive filtering at the input of a dc-dc regulator is the most common approach for mitigating EMI. To this end, part 12 of this article series predicts the differential-mode (DM) noise produced by the dc-dc converter by modeling the converter, the passive EMI filter and measurement equipment which includes the line impedance stabilizing network (LISN) and the EMI test receiver. In so doing, the goal is to streamline and better predict the effectiveness of the DM filter design. The converter input current is modeled as a current source and its harmonic content is estimated by Fourier analysis.

What you’ll learn:

• How to predict the differential-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 dc-dc converter input current in the frequency spectrum using Fourier analysis

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Author & Publication:

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

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