A temperature compensator for giant magnetoresistance effect current sensor

A technology of current sensor and temperature compensator, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., can solve the problems of high technical difficulty, difficult to realize, complex process, etc., and achieve obvious improvement, accuracy and temperature characteristics. Effect

Active Publication Date: 2011-12-21
TSINGHUA UNIV
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Problems solved by technology

[0005] The intrusive temperature compensation method is technically

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  • A temperature compensator for giant magnetoresistance effect current sensor
  • A temperature compensator for giant magnetoresistance effect current sensor
  • A temperature compensator for giant magnetoresistance effect current sensor

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Embodiment Construction

[0016] The temperature compensator for giant magnetoresistance effect current sensor that the present invention proposes, its structure is as follows figure 1 shown, including: DC voltage source, operational amplifier, negative temperature coefficient thermistor R T , the first high precision low temperature coefficient resistor R C1 and a second high precision low temperature coefficient resistor R C2 ; The inverting input terminal of the operational amplifier is connected to the positive pole of the DC voltage source, and one end of the negative temperature coefficient thermistor is connected to the first high precision low temperature coefficient resistor R C1 One end of the first high precision low temperature coefficient resistor is connected in series, the other end of the negative temperature coefficient thermistor is connected to the non-inverting input end of the operational amplifier, and the other end of the first high precision low temperature coefficient resistor...

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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...

Claims

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Application Information

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IPC IPC(8): G01R19/32
Inventor 何金良欧阳勇胡军嵇士杰曾嵘张波
Owner TSINGHUA UNIV
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