Department of Electronic Engineering, University of Valencia, C/Doctor Moliner, 50, 46100-Burjassot, Spain.
Sensors (Basel). 2011;11(3):2447-58. doi: 10.3390/s110302447. Epub 2011 Feb 25.
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.
提出了一种用于补偿磁电阻（MR）惠斯通电桥电流传感器灵敏度漂移的补偿方法。该技术通过将钌温度传感器和待补偿的 MR 传感器放置在广义阻抗转换器电路（GIC）中来实现。不需要对传感器桥臂进行内部修改，因此该电路能够补偿实际的工业传感器。该方法基于对桥路供电电流的温度调制，改进了以前基于恒流补偿的解决方案。使用微制造的自旋阀 MR 电流传感器展示了实验结果。已经解决了从-10 A 到+10 A 的测量电流在 0°C 到 70°C 之间的温度补偿问题。
