Nuevo artículo publicado: “An analog front-end circuit for non-contact voltage measurements, immune to input capacitance.”
https://ieeexplore.ieee.org/document/11027587
Abstract:
This work presents a novel analog front-end circuit for the non-contact voltage measurement of power-line voltages. It introduces a voltage supply driving scheme designed to address the primary challenge of this technique: its sensitivity to the input parasitic capacitance Cin. This capacitance affects the accuracy of the measurement and demands a specific calibration procedure to mitigate its effects. The proposed circuit is insensitive to Cin, thus improving the method accuracy and not requiring an additional calibration procedure. Several tests were performed to validate the solution. Actual non-contact power-line voltage measurements were done by using two different capacitive probes with coupling capacitances CX of 3.2 pf and 86 fF, resulting in accuracies of 0.2±0.3% and 2.6±0.3% respectively. These accuracy levels are mainly determined by the uncertainties of the measurement instruments instead of the factor Cin/CX as in previous solutions that highly penalize small capacitive probes.
Published in: IEEE Transactions on Instrumentation and Measurement
Date of Publication: 06 June 2025
Autores: Marcelo Haberman y Enrique Spinelli
