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There are two commonly used 3-phase configurations in power grid applications, the 3-phase 3-wire, and 3-phase 4-wire configurations. The 3-phase 4-wire power converter systems is necessary to supply single-phase loads but at the expense of higher output harmonics and losses, as compared to 3-phase 3-wire systems. The neutral inductor is added to reduce the neutral line harmonics and a LCL+ L filter...
Optimized common-mode (CM) filter design requires accurate knowledge of both the noise source and the termination impedances. In this paper, an in-circuit impedance extraction method is employed to determine CM impedance of a motor drive system. The CM impedance extracted allows systematic CM filter design without a trial-and-error approach.
Common mode (CM) and differential mode (DM) conducted emissions without the line impedance stabilization network (LISN) is investigated from the perspective of CM and DM impedances. Using a switched-mode power supply (SMPS) as an equipment under test (EUT), the in-circuit CM and DM impedances of the actual measurement setup with and without LISN are extracted so that the deviation of conducted emission...
To demonstrate the impact of the line impedance stabilization network (LISN) on conducted electromagnetic interference (EMI) measurement, an in-circuit impedance extraction method based on inductive coupling approach is developed to extract the common mode (CM) and the differential mode (DM) noise impedances of AC mains, LISN, and switched-mode power supply (SMPS) under operating condition. By treating...
In high-speed electrical designs, the in-circuit characteristics of the components are usually obtained from in-circuit measurements as the references for designers. The two-probe approach (TPA) is one of in-circuit measurement approaches by adopting the inductive coupling effects of the current probes, and it gains good accuracy below 30MHz. In this paper, we propose an improved two-probe approach...
Impedance matching is crucial in high-speed digital design to ensure signal integrity (SI). Accurate information of a device's output impedance allows precise selection of series resistor to match the device's output to the characteristic impedance of the connecting trace. This paper proposes an in-circuit measurement technique using two current probes to extract the output impedance information of...
This paper proposes a new approach to modeling the radio frequency (RF) electromagnetic disturbances in broadband power line communication (PLC) networks using the multi-conductor transmission line (MTL) theory. The model includes a differential-mode (DM) current propagation model and a common-mode (CM) current propagation model. The frequency range of interest is from 1 MHz to 30 MHz. Practical measurements...
A novel measurement method is proposed to evaluate the performance of a ferrite core on a power cord under actual operating condition. The proposed method allows the common-mode impedance of a ferrite core under in-circuit condition to be measured so that it provides a more realistic assessment of the noise suppression capability of the ferrite core. With a pre-measurement characterization process,...
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