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The in-circuit common-mode (CM) impedance at the AC input of a motor drivesystem (MDS) provides valuable inputs for evaluating and estimating the CMelectromagnetic interference (EMI) noise generated by the switching of powersemiconductor devices in the MDS. This paper introduces a single-probe setup(SPS) with frequency-domain measurement to extract the in-circuit CM impedanceof a MDS under its different operating modes. The SPS has the merits ofnon-contact measurement and simple structure.

Measurement of In-Circuit Common-Mode Impedance at the AC Input of a Motor Drive System