EMC and Circuit Protection


Filter connector inserts help pass EMC testing


EMI susceptibility and emissions are two of the major challenges companies must address before deploying a new high- reliability product. Avionics, mil-aero, automotive, and telecom are a few areas with strict emissions and susceptibility standards, as well as transient and ESD protection standards. These standards are implemented for safety and functionality reasons, and compliance is one of the last milestones companies must hit on their development path


O


ne of the toughest aspects of compliance is the fact that EMI is notoriously difficult to predict. Often, EMI problems are not apparent until


compliance testing—which can lead to a costly last-minute re-design.


To help electronics companies comply with EMC standards, Quell developed the EESeal and EESeal+ product lines of EMI filters targeting interconnects for military/defence and other high reliability applications. These products act as an add-in filter for standard connectors and are available in Europe through Powell Electronics, the supplier of connectors and more for high-rel applications including defence, aerospace and industrial. Samples can be obtained in as little as 24-48 hours, offering a cost-effective solution for production.


64 September2023 Components in Electronics


In a recent engagement with an aerospace client, an EESeal was used to eliminate a radiated emissions issue in a radio system, ultimately bringing the product into EMC qualification as determined under MIL-STD-461 testing. After excessive radiated emissions (50-200 MHz) were measured during EMC testing, the client needed a simple solution that eliminated noise in this frequency range. After direct consultation with Quell engineers, an EESeal product was proposed to provide targeted attenuation within this frequency range. The EESeal filter used in this project benefits from an electronic circuit for EMI suppression embedded inside and immediately brought the customer’s product into EMC compliance without requiring additional circuit designs, prototyping runs, simulations, or testing. In particular, it was found that


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