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Zeitschriftenartikel:

M. Hartmann, J. Biela, H. Ertl, J.W. Kolar:
"Wideband Current Transducer for Measuring AC Signals With Limited DC Offset";
IEEE Transactions on Power Electronics, Volume 24 (2009), 7,8,; S. 1776 - 1787.



Kurzfassung englisch:
In many applications, a current measurement that
can measure ac currents with dc offset is required. This is not
possible using conventional current transformers (CTs) due to the
core saturation because of the dc offset. In this paper, a new sensor
concept is presented, which consists of a wideband CT and a
demagnetizing circuit. The sensor concept is capable of measuring
ac currents with dc offset, which have periodic zero crossings, as
given in power-factor-corrected (PFC) circuits. Using the demagnetization
circuit, the core is actively reset during the zero crossing
intervals. The operation principle and design equations are discussed
in detail in this paper. For validating the presented concept,
three sensors have been built using different core materials, and
measurements of the transfer functions as well as operation in a
PFC system are presented. A bandwidth fromdc up to 20MHz has
been achieved.
Index Terms-Current measurement, current transformer (CT),
nanocrystalline material


Elektronische Version der Publikation:
http://publik.tuwien.ac.at/files/PubDat_177577.tif


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.