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"EMI Shielding for Automotive Application Solution Guide"

EMI Shielding for Automotive Application Solution Guide

The growing trend in electrification is presenting engineers with challenges from EMI. Government initiatives for alternatives to the internal combustion engine are driving a boost in the electrification of vehicles — from personal vehicles to long-haul trucks, delivery vans, farming equipment, and aircraft.

By design, the electric vehicle represents a large amount of electrical content confined to a space. The battery in an electric vehicle is one potential source of EMI. The all-electric vehicle has electromagnetic fields between the two battery packs (traction and auxiliary), the DC/DC converter, and other system components. Other types of electric vehicles — hybrid electric, plug-in hybrid electric, and fuel cell electric — have an auxiliary battery, making them EMI susceptible as well.

When considering EMI shielding for electric vehicles, the engineer must also keep in mind the heat and flammability associated with the battery. As with an increasing number of non-electric vehicles, electric vehicles may house navigation systems and safety applications, such as advanced driver assistance systems, that also rely on uninterrupted RF signals, representing additional areas for EMI.

Beyond the electric vehicle itself are related EMI concerns. Electric charging stations (ECS) represent a source of EMI due to the presence of AC and DC magnetic fields. The onboard electronics of the ECS require shielding from EMI as well. Additionally, the electric vehicle is susceptible to external sources of EMI ranging from common household items like garage door openers and cell phones to less frequently encountered sources like solar storms and high voltage power lines.

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