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Noise separators have been wildly used in separating the common mode and differential mode signals in conducted EMI measurements. The high frequency performance of a single phase noise separator is improved in this paper. It is realized by a detailed calculation of the impedance characterization of the transmission line transformer. Then an impedance matching capacitance is added at the output terminal...
This paper presents a novel hybrid output filter topology for inverter-motor system. It is composed of a conventional LC filter cascaded with an active motor CM impedance regulator. The active circuit, utilizing an integrated high-voltage op-amp, is very efficient in decreasing the motor CM equivalent capacitance as well as damping the high common voltage on the motor terminal. Therefore, the motor...
Most of the many reported compensation schemes for active EMI filters (AEFs) use either voltage canceling or current canceling to deal with high frequency electromagnetic interference noise. The purpose of this paper is to investigate the compensation characteristics of these two kinds of AEFs under different type of noise source, i.e., common mode (CM) and differential mode (DM) noise source. This...
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