Active Low-Voltage Half-Bridge-Based CM EMI Filter for Three-Phase Motor Inverters
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2025
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Conference Paper
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Abstract
Voltage-source inverters (VSIs) provide dc-ac conversion in three-phase motor drives, e.g., operating from a common dc-bus in industry or from a battery in electric vehicles. To comply with electromagnetic interference (EMI) regulations, dc-side passive filters are needed, which can contribute up to 30% of the total converter weight/volume. Consequently, active filters (AFs) are of interest: Even though the AF effectiveness becomes limited at higher frequencies, the cutoff frequency of the remaining passive filter can be increased and its size thus substantially reduced. This paper proposes a common-mode (CM) AF for six-switch three-phase VSIs operated with standard SPWM or SVM. The AF only requires two low-voltage half bridges and a capacitive injection network. The operating principle, sensitivities, and design aspects are presented, and detailed circuit simulations of an industrial motor drive (400 V dc, 2.5 kW, IEC 61800−3 EMI limits, 24 V AF supply) and an EV traction inverter (800 V dc, 125 kW, CISPR 25 EMI limits, 48 V AF supply) verify the concept, indicating a reduction of the required CM filter inductance by a factor of 2 (EV) to 6 (industrial) compared to a passive filter.
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published
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2025 Energy Conversion Congress & Expo Europe (ECCE Europe)
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11238616
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IEEE
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2025 Energy Conversion Congress & Expo Europe (ECCE Europe 2025)
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02294 - Mechatronische Systeme / Mechatronic Systems