Uniaxial tunnel magnetoresistive current measuring method

Abstract

The invention provides a uniaxial tunnel magnetoresistive current measuring method, and relates to the technical field of electrics. The measuring method comprises the steps: arranging a non-uniformly distributed circular tunnel magnetoresistive sensor array, determining the position and sensitive axis direction of each tunnel magnetoresistive sensor on a circular path based on an integral node of a Gaussian numerical integral formula, and taking the circular path corresponding to the array as a closed magnetic induction intensity integral path; and calculating a numerical integral value corresponding to the integral path based on the Gaussian numerical integral formula and the measurement data of the tunnel magnetoresistive sensor corresponding to each integral node, taking the numerical integral value as a linear integral value of the magnetic induction intensity on the circular path, and further solving the magnitude of the current to be measured. The current measuring method has the performance of shielding an external interference magnetic field of the array, and is suitable for being applied to a scene with a complex electromagnetic environment.

Description

technical field [0001] The invention belongs to the field of electrical technology and relates to a method for measuring uniaxial tunnel magnetoresistance current. Background technique [0002] The construction of smart grid requires real-time monitoring of the current parameters of the power system. The amplitude, frequency range and accuracy requirements of the monitoring current in different scenarios of the power system are different. Both traditional Rogowski coils and new fiber optic current sensors have certain limitations. For example, the Rogowski coil needs to go through the integration link in the process of signal processing, and the leakage of the integrator capacitor caused by long-term use will cause the problem of baseline drift; the stability and manufacturing cost of the fiber-optic current sensor make it difficult to apply on a large scale. [0003] At present, it is an emerging current measurement method to arrange several magnetic sensors around the co...

AI Technical Summary

Problems solved by technology

[0006] 1. The bandwidth of the Hall element is below 1MHz, which cannot meet the measurement of high-frequency current

[0007] 2. If the current to be measured deviates from the center of the circle, a relatively large measurement error will occur

[0009] However, this measurement method still has the following disadvantages: the method is based on Biot Savart's law, and the measurement method based on Biot Savart's law cannot effectively suppress the interfering magnetic field. large measurement error

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