Extraction of Noise Source Impedance Under Operating Conditions Using a Two-Probe Approach

In this work, a two-probe approach is proposed to extract noise source impedance under operating conditions. The proposed two-probe method is introduced and then validated by several passive components. Compared with the previous impedance extraction methods, the proposed approach has no direct electrical contact to equipment under test (EUT). Moreover, the calibration to eliminate the influence of probes and cables is conducted without any contact to the EUT. Finally, experimental results showed EMI filter designed based on the proposed approach can effectively attenuate conducted emissions in single-phase inverter.