A temperature compensator for giant magnetoresistance effect current sensor

Abstract

The invention relates to a temperature compensator for a giant magneto-resistance effect current sensor, belonging to the technical field of electric power system measurement. A reversed-phase input terminal of an operational amplifier in the temperature compensator is connected with an positive electrode of a direct current voltage source; one terminal of a negative temperature coefficient thermistor is connected in series with one terminal of a first high precision low temperature coefficient resistance; the other terminal of the negative temperature coefficient thermistor is connected withthe in-phase input terminal of the operational amplifier; the other terminal of the first high precision low temperature coefficient resistance is earthed; a second high precision low temperature coefficient resistance is connected in parallel between the in-phase input terminal and output terminal of the operational amplifier; and the output terminal of the operational amplifier is connected with a power supply terminal of the giant magneto-resistance effect current sensor. According to the invention, the temperature compensator p has the advantages of low cost and good stability and the like and is suitable for applying to the temperature compensation of the giant magneto-resistance effect current sensor; the precision of the giant magneto-resistance effect current sensor is greatly increased; moreover, a circuit with a simple structure, low cost and stable performance is used so that the compensation effect is very obvious.

Description

technical field [0001] The invention relates to a temperature compensator for a giant magnetoresistance effect current sensor, belonging to the technical field of power system measurement. Background technique [0002] The giant magnetoresistance effect current sensor is a sensor for AC and DC current measurement based on the giant magnetoresistance effect magnetic field measurement technology. It has the characteristics of wide frequency response, small size, low cost, and high sensitivity. [0003] The giant magnetoresistance effect device is a kind of magnetic sensitive device, which also has certain sensitivity to temperature. In the case of voltage source power supply, the output response of the giant magnetoresistance effect device gradually decays as the temperature rises, which has a great impact on the measurement performance of the giant magnetoresistance effect device, so it is necessary to take corresponding temperature compensation for the giant magnetoresistanc...

AI Technical Summary

Problems solved by technology

[0005] The intrusive temperature compensation method is technically difficult, the process is complicated, and it is difficult to realize

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