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Materials (Basel). 2017 Sep 26;10(10). pii: E1134. doi: 10.3390/ma10101134.

Electronic Energy Meter Based on a Tunnel Magnetoresistive Effect (TMR) Current Sensor.

Author information

1
Department of Electronics Engineering, University of Valencia, 46010 Valencia, Spain. engarvi@alumni.uv.es.
2
Department of Electronics Engineering, University of Valencia, 46010 Valencia, Spain. diego.ramirez@uv.es.
3
Department of Electronics Engineering, University of Valencia, 46010 Valencia, Spain. sergio.ravelo@uv.es.
4
Department of Electronics Engineering, University of Valencia, 46010 Valencia, Spain. jaime.sanchez@uv.es.
5
INESC Microsystems and Nanotechnologies (INESC-MN), Institute for Nanosciences and Nanotechnologies, 1000-029 Lisbon, Portugal. scardoso@inesc-mn.pt.
6
Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1000-029 Lisbon, Portugal. scardoso@inesc-mn.pt.
7
International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-31 Braga, Portugal. ricardo.ferreira@inl.int.
8
INESC Microsystems and Nanotechnologies (INESC-MN), Institute for Nanosciences and Nanotechnologies, 1000-029 Lisbon, Portugal. pfreitas@inesc-mn.pt.
9
Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1000-029 Lisbon, Portugal. pfreitas@inesc-mn.pt.
10
International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-31 Braga, Portugal. pfreitas@inesc-mn.pt.

Abstract

In the present work, the design and microfabrication of a tunneling magnetoresistance (TMR) electrical current sensor is presented. After its physical and electrical characterization, a wattmeter is developed to determine the active power delivered to a load from the AC 50/60 Hz mains line. Experimental results are shown up to 1000 W of power load. A relative uncertainty of less than 1.5% with resistive load and less than 1% with capacitive load was obtained. The described application is an example of how TMR sensing technology can play a relevant role in the management and control of electrical energy.

KEYWORDS:

current sensor; energy meter; internet-of-things; power measurement; tunnel magnetoresistance; wattmeter

Conflict of interest statement

The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

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