A Non-Invasive Thermal Drift Compensation Technique Applied to a Spin-Valve Magnetoresistive Current Sensor

Sensors

Jaime Sánchez Moreno¹  Diego Ramírez Muñoz¹  Susana Cardoso²  Silvia Casans Berga¹  Asunción Edith Navarro Antón¹ 

[1] Department of Electronic Engineering, University of Valencia, C/Doctor Moliner, 50, 46100-Burjassot, Spain; E-Mails:;Instituto de Sistemas e Computadores—Microsistemas e Nanotecnologias (INESC-MN) and Institute for Nanosciences and Nanotechnologies, R. Alves Redol 9, 1000-029 Lisbon, Portugal; E-Mails:

关键词: electrical current measurement;    magnetoresistance sensor;    spin-valve sensor;    temperature compensation;   

DOI  :  10.3390/s110302447

来源: mdpi

【 摘 要 】

A compensation method for the sensitivity drift of a magnetoresistive (MR) Wheatstone bridge current sensor is proposed. The technique was carried out by placing a ruthenium temperature sensor and the MR sensor to be compensated inside a generalized impedance converter circuit (GIC). No internal modification of the sensor bridge arms is required so that the circuit is capable of compensating practical industrial sensors. The method is based on the temperature modulation of the current supplied to the bridge, which improves previous solutions based on constant current compensation. Experimental results are shown using a microfabricated spin-valve MR current sensor. The temperature compensation has been solved in the interval from 0 °C to 70 °C measuring currents from −10 A to +10 A.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.