公开(公告)号：US20020149355A1

公开(公告)日：2002-10-17

申请号：US10172663

申请日：2002-06-14

Applicant: Honeywell Inc.

Inventor： David A. Sandquist ,  James E. Lenz ,  Dale F. Berndt

IPC: G01R033/00

CPC classification number: G01R15/205

Abstract: A magnetoresistive sensor system having resistive elements changing in ohmic value in the presence of a magnetic field of a current being measured. The variant values of the elements are amplified by some electronics that inherently add offset to the resultant values. The elements themselves also add an offset. The output of the electronics is modulated and then buffered as an output. This output is demodulated and integrated. The resultant signal is fed back to the input of the electronics to null out the offsets. The output of the buffer also goes to an inductive coil that is magnetically coupled to the resistive elements to null out the magnetic field from the current being measured. The buffer output indicates the magnitude of the current being measured. An oscillator outputs a signal to actuate the modulator and the demodulator. The oscillator signal also goes to a set/reset circuit for setting and resetting the resistive elements of the magnetoresistive sensor.

Abstract translation: 一种磁阻传感器系统，其具有在存在正被测量的电流的磁场的情况下以欧姆值变化的电阻元件。 这些元件的变体值由一些电子设备放大，固有地增加了偏移到所得到的值。 元素本身也增加了一个偏移量。 电子设备的输出被调制，然后作为输出进行缓冲。 该输出被解调和集成。 所得到的信号被反馈到电子设备的输入端以消除偏移。 缓冲器的输出也到达磁耦合到电阻元件的感应线圈，以从被测量的电流中消除磁场。 缓冲区输出指示正在测量的电流的大小。 振荡器输出一个信号来驱动调制器和解调器。 振荡器信号也到达设置/复位电路，用于设置和复位磁阻传感器的电阻元件。