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

作者：Sanchez Moreno Jaime; Ramirez Munoz Diego; Cardoso Susana; Casans Berga Silvia; Navarro Anton Asuncion Edith; Peixeiro de Freitas Paulo Jorge

来源：Sensors (Switzerland), 2011, 11(3): 2447-2458.

DOI：10.3390/s110302447

• electrical current measurement
• magnetoresistance sensor
• spin-valve sensor
• temperature compensation

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 degrees C to 70 degrees C measuring currents from -10 A to +10 A.

• 出版日期2011-3