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Characterization and Modeling of Single-Phase Common-Mode Chokes via Finite-Element Analysis | IEEE Conference Publication | IEEE Xplore

Characterization and Modeling of Single-Phase Common-Mode Chokes via Finite-Element Analysis


Abstract:

The common-mode (CM) choke is critical integral part of an electromagnetic interference (EMI) filter. An accurate electrical model of the CM choke is crucial to simulate ...Show More

Abstract:

The common-mode (CM) choke is critical integral part of an electromagnetic interference (EMI) filter. An accurate electrical model of the CM choke is crucial to simulate and evaluate the EMI filter performance with confidence. Numerical simulation has emerged as a feasible solution to realize the above-mentioned objectives without the presence of physical products, and thus reducing the trial-and-error process and achieving the choke design speedups. This paper proposes a comprehensive process for the characterization and modeling of single-phase CM chokes based on finite-element analysis (FEA). By extracting the transmission parameters through 3-D model of choke, both impedance magnitudes and phases of its CM or differential-mode (DM) can be collected. These impedances will then be used to derive the behavioral model. The results are validated experimentally with good agreement up to 100 MHz.
Date of Conference: 16-19 October 2023
Date Added to IEEE Xplore: 16 November 2023
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Conference Location: Singapore, Singapore

I. Introduction

The advancement of power electronic devices has sparked significant interest in the field of electromagnetic interference (EMI) as well as its associated solutions [1]–[6]. The single-phase common-mode (CM) choke is a critical component in EMI filter to mitigate both conducted [7]–[9] and radiated emissions [10]–[12]. Fig. 1 shows a typical single-phase CM choke that consists of two coupled winding coils wound on a high permeability magnetic core, which imparts a high CM impedance to suppress high-frequency CM currents. Due to the leakage flux, it also induces a differential-mode (DM) inductance, aiding in DM emission attenuation. Besides the CM and DM inductances, the turn-to-turn and phase-to-phase capacitances give rise to parasitic effects that affect the high-frequency performance of choke. With the emerging trend of high switching frequency to achieve highly compact power converters, there is a need for an accurate impedance model of the choke for a wider frequency band so that the EMI filter performance can be predicted and optimized [13]–[16].

References

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