Design and Optimization of EMC Filtering Strategies for DC-DC Converters in Electric Vehicles Applications

Authors

Soufiane Lghazi
Zakaria M'barki
Youssef Mejdoub
Kaoutar Senhaji Rhazi
Ali Ait Salih
DOI: https://doi.org/10.52549/ijeei.v14i1.7394
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Published: 14-02-2026 • Issue: Vol. 14 No. 1: March 2026 • Section: Regular paper

Abstract

The rapid electrification of vehicles intensifies electromagnetic interference (EMI) challenges in DC–DC converters, particularly isolated topologies used for high-voltage to low-voltage energy transfer. High-frequency switching generates common-mode (CM) and differential-mode (DM) conducted noise that threatens compliance with stringent CISPR 25 Class 5 standards. This paper proposes the design, modeling, and evaluation of a compact electromagnetic compatibility (EMC) filter capable of simultaneously suppressing CM and DM emissions in an isolated DC–DC converter for electric vehicle applications. The proposed passive filter combines a CM choke with Y-capacitors, a DM Ï€-filter using X-capacitors and series inductors, and an RC damping branch to avoid resonances. The converter and filter were modeled in LTspice, and conducted emission spectra were evaluated using a Line Impedance Stabilization Network (LISN) with Fast Fourier Transform (FFT) analysis. Simulation results demonstrate that conducted emissions are reduced by about 40 dBµV, ensuring full compliance with CISPR 25 Class 5 limits. The proposed solution offers a cost-effective and practical approach to improve EMC margins and reliability in automotive DC–DC converters. The results presented in this study are based on circuit-level simulations, and experimental validation will be addressed in future work.
Keywords: Electric vehicles; DC-DC converter; Electromagnetic compatibility; Electromagnetic interference; Common-mode and differential-mode noise

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How to Cite

[1]
S. Lghazi, Z. M'barki, Y. Mejdoub, K. Senhaji Rhazi, and A. Ait Salih, “Design and Optimization of EMC Filtering Strategies for DC-DC Converters in Electric Vehicles Applications”, IJEEI, vol. 14, no. 1, pp. 31–43, Feb. 2026, doi: 10.52549/ijeei.v14i1.7394.