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Proceedings Paper

Ultra-low power sensor for autonomous non-invasive voltage measurement in IoT solutions for energy efficiency
Author(s): Clemente Villani; Domenico Balsamo; Davide Brunelli; Luca Benini
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Paper Abstract

Monitoring current and voltage waveforms is fundamental to assess the power consumption of a system and to improve its energy efficiency. In this paper we present a smart meter for power consumption which does not need any electrical contact with the load or its conductors, and which can measure both current and voltage. Power metering becomes easier and safer and it is also self-sustainable because an energy harvesting module based on inductive coupling powers the entire device from the output of the current sensor. A low cost 32-bit wireless CPU architecture is used for data filtering and processing, while a wireless transceiver sends data via the IEEE 802.15.4 standard. We describe in detail the innovative contact-less voltage measurement system, which is based on capacitive coupling and on an algorithm that exploits two pre-processing channels. The system self-calibrates to perform precise measurements regardless the cable type. Experimental results demonstrate accuracy in comparison with commercial high-cost instruments, showing negligible deviations.

Paper Details

Date Published: 21 May 2015
PDF: 11 pages
Proc. SPIE 9517, Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems, 95172I (21 May 2015); doi: 10.1117/12.2181332
Show Author Affiliations
Clemente Villani, Univ. degli Studi di Bologna (Italy)
Domenico Balsamo, Univ. degli Studi di Bologna (Italy)
Davide Brunelli, Univ. degli Studi di Trento (Italy)
Luca Benini, Univ. degli Studi di Bologna (Italy)
ETHZ (Switzerland)

Published in SPIE Proceedings Vol. 9517:
Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems
José Luis Sánchez-Rojas; Riccardo Brama, Editor(s)

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