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Low-cost rectifier for measuring of AC voltage or current frequency compensation proposal

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dc.title Low-cost rectifier for measuring of AC voltage or current frequency compensation proposal en
dc.contributor.author Pospíšilík, Martin
dc.contributor.author Vařacha, Pavel
dc.contributor.author Adámek, Milan
dc.relation.ispartof International Journal of Circuits, Systems and Signal Processing
dc.identifier.issn 1998-4464 OCLC, Ulrich, Sherpa/RoMEO, JCR
dc.date.issued 2012
utb.relation.volume 6
utb.relation.issue 6
dc.citation.spage 394
dc.citation.epage 401
dc.type article
dc.language.iso en
dc.publisher North Atlantic University Union (NAUN) en
dc.relation.uri http://www.naun.org/multimedia/NAUN/circuitssystemssignal/16-632.pdf
dc.subject Frequency dependence en
dc.subject Mean value measurement en
dc.subject Rectifier en
dc.subject Successive approximation en
dc.subject Voltmeters en
dc.description.abstract Usually the rectifiers are the most problematic devices of the low-cost measurement instruments. The features of a simple full wave rectifier construction with an operational amplifier are usually determined by the rectifying diodes and the slew rate of the operational amplifier and unfortunately, they suffer from the dependence on the amplitude of the measured signal. Of course, special topologies as well as current-mode operating devices can be used, but this paper considers the possibility of how the frequency range of a cheap conventional rectifier can be broadened. It is supposed that the rectifier operates on a single signal level at which it can be well frequency compensated. The measurement is processed indirectly by a microcontroller that changes the amplification factor of a preamplifier in order the target level was achieved. Subsequently the measured value is computed from the amplification factor required to achieve the target level. However, this approach, although it looks simple, can result in very time consuming processing if the frequency of the measured signal is too low. Therefore several approaches and proposals are discussed. The authors believe that the proposed solution, although quite complex, can bring satisfactory results when used in multimeters equipped with a microcontroller that employ a three digit display and are capable of operation up to 100 kHz or 1 MHz in dependence on the construction of its internal circuits. en
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1003228
utb.identifier.rivid RIV/70883521:28140/12:43868725!RIV13-MSM-28140___
utb.identifier.obdid 43868904
utb.identifier.scopus 2-s2.0-84876906299
utb.source j-scopus
dc.date.accessioned 2013-05-22T11:53:01Z
dc.date.available 2013-05-22T11:53:01Z
utb.contributor.internalauthor Pospíšilík, Martin
utb.contributor.internalauthor Vařacha, Pavel
utb.contributor.internalauthor Adámek, Milan
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