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    Power Factor Correction

    D01.14 - Dm Conducted EMI Noise Prediction for Variable-Frequency, Variable-On-Time Interleaved iTCM Totem-Pole PFC Converters

    Monday, March 23, 2026
    12:00 PM - 1:30 PM CT
    Location: Poster 1
    This paper presents a numerical modeling method based on the Short-Time Fourier Transform (STFT) for predicting the differential-mode (DM) conducted electromagnetic interference (EMI) noise of two-phase interleaved integrated triangular current mode (iTCM) totem-pole PFC converters. The proposed method incorporates the time-varying switching frequency and on-time characteristics of iTCM operation, models the drain-to-source voltages as noise sources, and uses STFT to extract their instantaneous harmonic spectra over the line cycle. Experimental results show close agreement with the predictions, with peak DM noise measured at 100.78 dBμV at 137 kHz for single-phase operation and reduced to 91.32 dBμV at 274.7 kHz under interleaving. The proposed STFT-based modeling framework offers an accurate and efficient tool for EMI prediction and DM filter pre-design over varying operating conditions.