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Evaluation of a Digitizer Designed to Interface a Non-Intrusive AC Voltage Measurement Probe by Shenil, P. S.; George, Boby is a Engineering article available to read on EtoBox.

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A low-cost yet efficient digitizer, suitable for a capacitive type non-contact ac voltage probe is presented. The existing measurement scheme for such a probe requires an interfacing circuit, an analog-to-digital converter followed by a processor to compute fast Fourier transform (FFT) to obtain an output. It will be beneficial and less complex if an analog to digital converter can be developed that can directly interface with the probe and get the final output without FFT computation. Such a scheme that operates based on the dual-slope analog-to-digital conversion technique is presented in this paper. Its output is directly proportional to the fundamental component of the unknown ac voltage. Output has negligible sensitivity to the variations in the probeto-wire capacitance. The proposed scheme has a new and simple compensation approach to accurately obtain the fundamental of the unknown voltage, even if it has significant 3 rd harmonics. A detailed analysis of various sources of errors affecting the performance of the scheme is conducted and the details are presented in the paper. A prototype of the proposed scheme has been designed, developed and interfaced with a laboratory-mad

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Author

Shenil, P. S.; George, Boby

Publisher

IEEE; Institute of Electrical and Electronics Engineers; Institute of Electrical and Electronics Engineers (IEEE) (ISSN 1530-437X)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)