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Digital diaphragm-vibrating type current sensor

A current sensor, diaphragm type technology, applied in the field of digital diaphragm type current sensor, can solve problems such as inability to effectively respond to small signals and aperiodic components, reliability and stability issues, and randomness of material aging

Inactive Publication Date: 2013-08-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of temperature drift, material aging and random error of the magneto-optic current sensor are difficult to solve, which makes the working stability of the magneto-optic current sensor questionable. After more than 60 years of research and development, it has not been popularized and applied so far.
[0005] The air-core coil electronic current sensor has no iron core, so there is no magnetic saturation problem, but the disadvantage is that it cannot effectively respond to small signals and non-periodic components
The high-potential electronic circuit's demand for power also brings reliability and stability issues

Method used

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  • Digital diaphragm-vibrating type current sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] This embodiment is a permanent magnet two-terminal drive current coil film vibration mode, and its structure is as follows Figure 5 Shown: thin film [3], permanent magnet [4], current coil [5], laser light source [6], transmission fiber [7], laser collimator [8], foam shading material [9], optical mirror [10], beam expander lens [11], digital photoelectric conversion and signal control processor [12], magnetic shielding [13] are all placed in the insulator [14], [13] is used to shield the main conductor current magnetic field. The permanent magnet [4] is placed on both sides of the film [3], the current coil [5] is integrated with the film [3], the current coil [5] shunts the main wire current, and the magnetic field generated by the coil current is in the permanent magnet [4 ] The double-terminal driving of the magnetic field force drives the film [3] to vibrate (AC) or precess (DC), and its amplitude is a linear function of the current. The laser signal is transmitt...

Embodiment 2

[0023] This embodiment is a current shunt coil double-ended driving permanent magnet film vibration mode, and its structure is as follows Figure 6Shown: current shunt coil[2], thin film[3], permanent magnet[4], laser light source[6], transmission fiber[7], laser collimator[8], foam shading material[9], light reflection Mirror [10], beam expander lens [11], digital photoelectric conversion and signal control processor [12], magnetic shielding [13] are all placed in the insulator [14], [13] is used to shield the main conductor current magnetic field. Two current shunt coils are placed on both sides of the film, the permanent magnet and the film are integrated, the two current shunt coils [2] shunt the equivalent main wire current, and the magnetic field generated by the shunt coil current drives the permanent magnet to drive the film to vibrate ( AC) or precession (DC), the magnitude of which is a linear function of the current. The laser signal is transmitted from the light s...

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Abstract

The invention relates to a digital diaphragm-vibrating type current sensor. The basic principle is as follows: the mutual action based on the permanent magnetic field and the current magnetic field drives the diaphragm to vibrate, and a digital current signal is obtained by measuring vibration. The digital diaphragm-vibrating type current sensor definitely comprises a diaphragm-vibrating system and a microvibration photoelectric measurement system, wherein the diaphragm-vibrating system has two implementation modes: a mode of using the two ends of a permanent magnet to drive a current diaphragm to vibrate, and a mode of using the two ends of a current shunt coil to drive a permanent magnetic diaphragm to vibrate; and the microvibration photoelectric measurement system applies a method of modulating a linear array charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor by using the edge of laser beam to directly obtain digital current signals.

Description

technical field [0001] The invention relates to a digital diaphragm type current sensor. The basic principle is to drive a thin film to vibrate based on the interaction between a permanent magnetic field and a current magnetic field, and obtain a digital current signal by measuring the vibration. The invention includes two vibration driving modes and two digital photoelectric conversion modes, and is suitable for AC and DC current measurement in power systems. Background technique [0002] There are three types of current transformers or sensors currently used: electromagnetic, magneto-optical, and air-core coil electronic. [0003] The application of electromagnetic current transformer has a history of more than 120 years, and it is an important tool for power system measurement. However, electromagnetic current transformers have many fundamental defects, such as high insulation cost, low safety and reliability; fault current often leads to magnetic saturation of the iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 徐启峰
Owner FUZHOU UNIV