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Practical EMI Control in a Power Component Design Space

David Bourner

Abstract
The control of electromagnetic interference (EMI) within switched-mode power systems is a perennial topic. This article attempts to address the notion of control of conducted emissions in the context of applying Vicor Power Components in a customer application. Vicor has developed quasi-resonant topologies that mitigate noise to a great extent by design. Although there are significant noise reductions to be had using resonant topologies in SMPS, no converter is ever noise-free. Applying power modules in a way to assure compliance with CE engineering standards can often prevent unforeseen, costly delays in bringing products to market.

Managing conducted emissions from concept through implementation

Introduction
Conducted emissions control must be a consideration at the outset of a power system design, made well before final integration with other parts of a complete application. The noise mitigation schemes used must be developed alongside the power and signal processing pathways. The implementation of the system should be routinely subject to a series of pre-qualification tests, which although subjective, quickly bear results which indicate whether or not the final product will be adequately arranged for successful qualification outcomes. We look for minimal emissions that are below those levels that represent adequate performance.

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