Magnetic sensing chip, closed-loop feedback current sensor and preparation method of closed-loop feedback current sensor

A current sensor and closed-loop feedback technology, applied in the field of sensing and measurement, can solve the problems of increasing the volume and weight of the current sensor and failing to meet the application requirements of miniaturization, so as to reduce the volume and weight, reduce the volume, and control the production cost Effect

Pending Publication Date: 2020-09-11
珠海多创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of current sensor needs to wind the feedback coil winding outside the magnetic ring. Winding the feedback coil winding increases the volume and weight of the current sensor, which cannot meet the application requirements of miniaturization.

Method used

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  • Magnetic sensing chip, closed-loop feedback current sensor and preparation method of closed-loop feedback current sensor
  • Magnetic sensing chip, closed-loop feedback current sensor and preparation method of closed-loop feedback current sensor
  • Magnetic sensing chip, closed-loop feedback current sensor and preparation method of closed-loop feedback current sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to figure 1 with figure 2 The closed-loop feedback current sensor of this embodiment includes a housing 10, a magnetic sensor chip 1 and a signal processing circuit 20 disposed in the housing 10, wherein the signal processing circuit includes a magnetic balance circuit 2, a temperature compensation circuit 3 and a current sampling circuit 4 . In this embodiment, there is a circular opening in the center of the housing 10, through which the conductor 21 to be tested can pass. The magnetic sensor chip 1 and the signal processing circuit 20 are arranged on the circuit board respectively, the magnetic sensitivity direction of the magnetic sensor chip 1 (magnetic sensor unit) is perpendicular to the conductor 21 to be tested, and the signal processing circuit 20 is connected to the magnetic sensor through pins or wires. The sensor chip 1 is electrically connected. In other embodiments, no opening may be provided on the housing. In this embodiment, an opening is pro...

Embodiment 2

[0057] The difference between this embodiment and Embodiment 1 lies in that in this embodiment, the circuit with the integration link in the signal processing circuit is replaced by digital signal processing, so as to reduce the temperature drift caused by the integration circuit. The signal processing circuit 20 of this embodiment includes a first analog-to-digital converter 2-1, a push-pull emitter follower 2-2, a digital-to-analog converter 2-3, a current sampling circuit 4, a second analog-to-digital converter 2- 5. A temperature sampling circuit 2-6, a third analog-to-digital converter 2-7, and a microcontroller processor 2-8. Wherein, the push-pull emitter follower 2-2 constitutes a magnetic balance circuit, and the temperature sampling circuit 2-6 constitutes a temperature compensation circuit. The first analog-to-digital converter 2-1 is connected with the magnetic sensing unit 1-1, and collects the voltage signal V output by the magnetic sensing unit 1-1 M , and conv...

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Abstract

The invention discloses a magnetic sensing chip, a closed-loop feedback current sensor and a preparation method of the closed-loop feedback current sensor. The closed-loop feedback current sensor includes a shell; the magnetic sensing chip and the signal processing circuit are arranged in the shell, the magnetic sensing chip comprises a magnetic sensing unit composed of magneto-resistor elements and a feedback coil arranged above the magnetic sensing unit, the feedback coil is of a planar spiral line structure formed by etching a conductive material, and the spiral line plane is perpendicularto the sensitive direction of the magnetic sensing unit; the signal processing circuit comprises a magnetic balance circuit and a current sampling circuit, and the magnetic sensing chip is connected with a power supply through an input terminal and connected with the magnetic balance circuit through an output terminal; the magnetic balance circuit is connected with the feedback coil and provides current for the feedback coil, so that the feedback coil generates a feedback magnetic field; the current sampling circuit is connected with the feedback coil and collects and outputs a current signalof the feedback coil. According to the closed-loop feedback current sensor, the magneto-resistor elements and the feedback coil are integrated in the magnetic sensing chip, so that the size and the weight of the closed-loop feedback current sensor are reduced.

Description

technical field [0001] The invention belongs to the technical field of sensing and measurement, and in particular relates to a magnetic sensing chip and a closed-loop feedback current sensor. Background technique [0002] There are two types of current sensors: open-loop sensors and closed-loop sensors. The open-loop current sensor uses magnetic sensitive elements to generate an analog signal proportional to the measured current to achieve the purpose of measuring current. The open-loop current sensor has a simple structure and strong overload capacity, but the open-loop method leads to poor linearity, which affects the measurement accuracy of the current sensor. [0003] Compared with the open-loop current sensor, the closed-loop feedback current sensor has higher sensitivity and wider measurement range. The closed-loop feedback current sensor includes a magnetic modulation-based closed-loop feedback current sensor and a magnetic sensor-based closed-loop feedback current s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/32G01R15/20
CPCG01R19/32G01R15/20
Inventor 刘明关蒙萌黄豪胡忠强朱家训
Owner 珠海多创科技有限公司
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