Projeto e construção de uma sonda de corrente monofásica CA/CC, compatível com os modelos de osciloscópios disponíveis nos laboratórios da UTFPR – campus Curitiba

Abstract

This work deals with the constructive aspects of a single-phase AC/DC current probe compatible with the oscilloscope models available in the laboratories of the Federal Technological University of Paraná, on Curitiba campus. The work is the result of the need to use equipment in laboratory classes, which due to the high cost of acquisition is not available for use in UTFPR laboratories. Initially, the academic work addresses the theoretical aspects for the development of each stage of the current probe design, which is composed of the following circuits: Rectifier, Flyback Converter, Measurement, Control and Signal Conditioning. In the design stage, the circuit components were dimensioned and then simulated in order to validate the designed circuit. Subsequently, the prototype construction and test stage were accomplished, in which some design errors were verified and required corrective actions. To verify the correct functioning of the prototype, proceed to the test step, which consisted of comparing the current waveforms of the current obtained by the probe built and the commercial probe. Although the result is not entirely in line with expectations, due to the high degree of noise and low signal quality, the prototype built was promising and viable, since the construction cost was lower than the cost of acquiring a commercial probe.