Understanding how to manage and reduce emissions is crucial to the performance of your design. This paper examines the fundamentals of electromagnetic interference (EMI) emissions, highlighting requirements and industry standards as they relate to implementation in an isolated DC/DC converter.

EMI challenges in power supply design • EMI is a challenge for nearly all electronic systems • EMI source →coupling path →receptor •Conducted path through cabling •Radiated EMI path through air • Conducted EMI: EN55022 covers frequencies from 150kHz to 30MHz • Radiated EMI: EN55022 covers frequencies from 30 MHz to 1 GHz

Numerous governing bodies regulate the permis-sible levels of conducted and radiated emissions generated by an end product in order to maintain electromagnetic compatibility (EMC). The focus of this white paper is on EMI standards for conducted emissions, particularly those relevant to automotive, communications and industrial applications.

The Engineer’s Guide To EMI In DC-DC Converters (Part 7): Common-Mode Noise Of A Flyback by Timothy Hegarty, Texas Instruments, Phoenix, Ariz. Parts 5 and 6 of this article series[1-6] offered practical guidelines and examples to mitigate conducted and radiated electromagnetic interference (EMI) for nonisolated dc-dc regulator circuits.

In systems where the DC/DC circuit must be placed very close to the connector, effective shielding must be considered early in the design process. Thermally necessary heatsinks can sometimes be utilized for shielding. Ideally, the inductor, the DC/DC IC with power MOSFETs, and its decoupling capacitors are all located under the shield.

The first is medical and research instruments themselves; MRI?s and NMR?s emit extremely high, and occasionally ramping, DC fields, creating Quasi-DC fields. In addition, research campuses are being built in urban areas, near public transportation.

Sep 12, 2019 · MPS Senior FAE Christian Kueck returns to discuss sources of EMI on PCB layouts, EMI issues with DC-DC power supply performance, impact of switching frequency, how passive components affect conducted/radiated EMI, and module vs. discrete solutions.

Jan 20, 2024 · Absolutely, including varistors in DC motors can be an effective strategy for reducing Electromagnetic Interference (EMI). Varistors, specifically metal oxide varistors (MOVs), are voltage-dependent resistors that can absorb high-voltage surges and transient spikes.

Therefore the power designer must focus on system EMI noise reduction and mitigation to design dc-dc converters that meet electromagnetic compliance (EMC) standards. Part 1 in this article series reviews the EMC standards for industrial and automotive end equipment and describes how to measure conducted EMI in pre-compliance testing.

Apr 3, 2020 · Selecting the right switching DC-DC step-down regulator while minimizing EMI can feel like a balancing act. In this article, we'll discuss what EMI is and how to reduce EMI in power management circuits using Analog Device's new integrated regulator as a use case.