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A novel signal conditioning scheme for magneto-resistive angle sensors

机译:磁阻角度传感器的新型信号调理方案

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摘要

A new, simple and efficient electronic scheme suitable for magneto-resistive angle sensors with 0–360° range is presented in this paper. Most of the existing magneto-resistive angle sensors have a sine/cosine relationship between the output and sensing angle but a linear characteristic is highly useful. The proposed Signal Conditioning (SC) method accepts and processes output signal from the sensor that is sine/cosine in-nature and provides an output directly proportional to the sensing angle. Accuracy of the final output depends mainly on a dc reference voltage and a reference sinusoidal signal. A prototype of the proposed SC circuit has been built and tested to verify the practicality of the scheme. Output of the prototype circuit was linear across 0 to 360° and worst-case error was less than 0.08%. An angle sensor assembly using a magneto-resistive sensing element has been built for further tests. This unit provides two output signals. The SC circuit is an optimized scheme for best accuracy when operating with these signals. The sensor unit has been interfaced with the SC circuit and tested. As expected, the output was found to be linear for the full-circle range.
机译:本文提出了一种适用于0–360°范围的磁阻角度传感器的新的,简单而有效的电子方案。现有的大多数磁阻角度传感器在输出和感测角度之间具有正弦/余弦关系,但是线性特性非常有用。所提出的信号调节(SC)方法接收并处理来自传感器的正弦/余弦性质的输出信号,并提供与传感角成正比的输出。最终输出的精度主要取决于直流参考电压和参考正弦信号。已经构建了所提出的SC电路的原型并进行了测试,以验证该方案的实用性。原型电路的输出在0至360°之间呈线性,最坏情况的误差小于0.08%。已经建立了使用磁阻感测元件的角度传感器组件以进行进一步测试。本机提供两个输出信号。 SC电路是优化的方案,可在使用这些信号时获得最佳精度。传感器单元已与SC电路连接并经过测试。正如预期的那样,发现整个圆范围内的输出都是线性的。

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