Giant magnetoresistive effect current sensor using amorphous alloy magnetic ring structure

A current sensor, amorphous alloy technology, applied in the measurement of current/voltage, instrument, measurement of electrical variables and other directions, can solve the problems of high insulation requirements, difficult installation, bulky and other problems, to achieve wide frequency response, good stability, Sensitive effect

CN102323467AInactive Publication Date: 2012-01-18TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-01-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a giant magnetoresistive effect current sensor using an amorphous alloy magnetic ring structure, and belongs to the technical field of power system measurement. In the current sensor, a wire to be measured passes through an amorphous alloy magnetic ring; and a direct current magnetic biasing coil is wound on the amorphous alloy magnetic ring and is powered by a direct current constant current source. A plurality of layers of giant magnetoresistive effect chips are arranged in an air gap of the amorphous alloy magnetic ring. Positive output ends and negative output ends of the chips are connected with the in-phase input end and the inverted input end of an instrument amplifier respectively; and an output end of the instrument amplifier is connected with an in-phase input end of an operational amplifier. A voltage following resistor is connected in parallel between an inverted input end and an output end of the operational amplifier; the output end of the operational amplifier is connected with an input end of an analog / digital converter; and an output end of the analog / digital converter is connected with a nixie tube display. The current sensor has the advantages of small size, low cost, low energy consumption, wide frequency response, high sensitivity, stabile characteristic and the like, and meets the requirements of environmental friendliness, energy conservation and large-scale distributed monitoring in a novel intelligent power grid.
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Description

technical field

[0001] The invention relates to a giant magnetoresistance effect current sensor adopting an amorphous alloy magnetic ring structure, which belongs to the technical field of power system measurement. Background technique

[0002] At present, there are mainly three kinds of known current sensors used for power system measurement: traditional electromagnetic current transformers, fiber optic current sensors, and Hall effect current sensors.

[0003] The traditional electromagnetic current transformer is based on the coil principle, and the current is measured through the induction of the coil. This type of electromagnetic current transformer is bulky, expensive, and difficult to install. The primary side and secondary side of the measurement cannot be electrically isolated, and the insulation requirements are high. They can only measure AC current and cannot be used for large-scale distributed monitoring. . The cost of fiber optic current sensor is too high, a...

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Embodiment Construction

[0013] The giant magnetoresistance effect current sensor that adopts amorphous alloy magnetic ring structure that the present invention proposes, its structure is as follows figure 1 As shown, it includes amorphous alloy magnetic ring 2, DC constant current source DC, DC bias coil 3, multilayer film giant magnetoresistance effect chip GMR, instrumentation amplifier A, operational amplifier AMP, voltage following resistor R, and analog-to-digital converter A / D and Nixie tube display LED. The DC bias coil is wound on the amorphous alloy magnetic ring, and the DC constant current source supplies power to the DC bias coil; the measured wire 1 passes through the amorphous alloy magnetic ring 2, and the amorphous alloy magnetic ring 2 has an air gap . The multilayer film giant magnetoresistance effect chip GMR is placed in the air gap of the amorphous alloy magnetic ring. The positive output terminal and the negative output terminal of the multilayer film giant magnetoresistance e...