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    Quality and System Reliability Including EMI/EMC

    D23.8 - Study of Electric and Magnetic Near-Fields from a Half-Bridge Converter and Their Impacts on Conducted Emissions in Other Devices

    Thursday, March 26, 2026
    12:00 PM - 1:45 PM CT
    Location: Poster 1
    Current radiated immunity (RI) standards for automobiles primarily address far-field (FF) radiation from external sources in the low MHz to GHz range, which can interfere with vehicle electronics. However, modern vehicles are increasingly exposed to near-field (NF) emissions from internal sources such as power electronics in electric motors, drives, and onboard chargers, operating at much lower frequencies (10s of kHz). These NF emissions often exceed RI test limits by over an order of magnitude and, unlike FF noise, can couple conductively into vehicle systems, posing significant risks. This paper examines the electric (E-) and magnetic (H-) fields generated by a half-bridge converter, identifying high-voltage power semiconductors as the primary source of E-field NF emissions. Additionally, EMI coupling and conducted emissions from a nearby DC ‘Brick’ are analyzed. Measured results highlight NF emissions as critical contributors to electromagnetic compatibility (EMC) challenges in modern automotive systems