A Novel Single-Probe Setup for Multifrequency Simultaneous Measurement of In-Circuit Impedance

The single-probe setup (SPS) based on the inductive coupling approach is a promising candidate for in-circuit impedance measurement of an energized electrical system due to its noncontact characteristics and simple configuration. However, the conventional SPS performs the measurement with a frequenc...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2023-09, Vol.70 (9), p.9538-9549
Main Authors: Weerasinghe, Arjuna, Zhao, Zhenyu, Sun, Quqin, Fan, Fei, Tu, Pengfei, Wang, Wensong, See, Kye Yak
Format: Article
Language:English
Subjects:
Algorithms
Circuits
Couplings
Electric contacts
Electric variables measurement
Excitation
Fourier transforms
Impedance
Impedance measurement
In-circuit impedance
Inductive coupling
Measuring instruments
multifrequency simultaneous measurement
multisine excitation
Probes
short-time Fourier transform (STFT)
single-probe setup (SPS)
Time measurement
Time-domain analysis
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Summary:The single-probe setup (SPS) based on the inductive coupling approach is a promising candidate for in-circuit impedance measurement of an energized electrical system due to its noncontact characteristics and simple configuration. However, the conventional SPS performs the measurement with a frequency-domain measuring instrument via stepped swept-sine excitation. It measures in-circuit impedance at only single frequency at a time while sweeping across frequencies of interest, which is not only inefficient but also not fast enough to capture in-circuit impedance with time-variant characteristics. To overcome these limitations, this article proposes a novel SPS with a time-domain measuring instrument via multisine excitation. The proposed SPS can perform multifrequency simultaneous measurement of in-circuit impedance without direct electrical contact. By combining it with a short-time Fourier transform algorithm, in-circuit impedance with time-variant characteristics can be captured. Experimental case studies validate the capability and accuracy of the proposed SPS.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2022.3210577