Shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor

Abstract

The invention discloses a shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor which comprises a sensor shell, and a U-shaped wire, tunneling magnetoresistors and a silicon steel sheet which are arranged in the sensor shell, wherein two sides of the U-shaped wire respectively serve as a to-be-detected current input end and a to-be-detected current output end; the tunneling magnetoresistors are respectively arranged under the two sides of the U-shaped wire; a parallel magnetic field parallel to the tunneling magnetoresistors is arranged in the induction direction of each tunneling magnetoresistor; the two tunneling magnetoresistors respectively induce a magnetic field generated by current in different directions on the two sides in the U-shaped wire, and two voltage signals are output; the silicon steel sheet is embedded in the sensor shell and is used for shielding external magnetic disturbance. According to the shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor, the influence of temperature on the current sensor output is improved, the capacity of adapting a complex working environment through a current sensor is improved, the output accuracy of the current sensor is greatly improved in a whole temperature range, and the temperature characteristics are 7 times that of a traditional identical sensor.

Description

technical field [0001] The invention relates to a magnetic sensor, in particular to a shielded open-loop tunnel magnetoresistive sensor without a magnet gathering ring. Background technique [0002] Traditional open-loop current sensors are based on the principle of the Hall effect, a phenomenon discovered by American physicist Hall in 1897 when he was studying the mechanism of metal conduction. When the current passes through the conductor perpendicular to the external magnetic field, a potential will appear between the two end faces of the conductor perpendicular to the magnetic field and the current direction. The traditional Hall open-loop current sensor generates the current flowing through the measured conductor through the magnetic gathering ring. The magnetic field is gathered in the magnetic ring with a gap, and the Hall sensing chip is placed in the gap of the magnetic gathering ring. The magnetic field in the gap passes through the Hall sensing chip vertically, an...

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Problems solved by technology

When the current passes through the conductor perpendicular to the external magnetic field, a potential will appear between the two end faces of the conductor perpendicular to the magnetic field and the current direction. The traditional Hall open-loop current sensor generates the current flowing through the measured conductor through the magnetic gathering ring. The magnetic field is gathered in the magnetic ring with a gap, and the Hall sensing chip is placed in the gap of the magnetic gathering ring. The magnetic field in the gap passes through the Hall sensing chip vertically, and a Hall potential difference is generated at both ends of the sensing chip. Through subsequent amplification The circuit increases the induction signal, and the output signal changes linearly when the current c

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