CN212379466U - Zero-magnetic-flux TMR current detection sensor with rapid demagnetization capability - Google Patents
Zero-magnetic-flux TMR current detection sensor with rapid demagnetization capability Download PDFInfo
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- CN212379466U CN212379466U CN202020486846.1U CN202020486846U CN212379466U CN 212379466 U CN212379466 U CN 212379466U CN 202020486846 U CN202020486846 U CN 202020486846U CN 212379466 U CN212379466 U CN 212379466U
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000005347 demagnetization Effects 0.000 title claims abstract description 16
- 230000003321 amplification Effects 0.000 claims abstract description 33
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 33
- 238000005070 sampling Methods 0.000 claims abstract description 16
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Abstract
The utility model relates to a zero magnetic flux TMR current detection sensor with rapid degaussing capability, which comprises a round opening magnetic ring, a TMR chip, a differential amplifying circuit, a power amplifying circuit, a low pass filter module, an AD sampling module, a main control unit, a feedback circuit, a power supply, a degaussing circuit and a magnetic gathering ring, wherein the TMR chip is positioned in an air gap opening of the round opening magnetic ring, the TMR chip receives a magnetic signal of a current of a wire to be tested, converts the magnetic signal into a voltage signal and then sends the voltage signal to the differential amplification circuit, the differential amplification circuit outputs a signal to the power amplification circuit, the power amplification circuit outputs a signal to the low-pass filtering module, the low-pass filtering module outputs a signal to the feedback circuit and the AD sampling module respectively, the feedback circuit sends a feedback signal to the TMR chip, the AD sampling module is connected with the main control unit, the power supply is used for supplying power, and the demagnetization circuit is used for demagnetizing the magnetic gathering ring. The device has the advantages of large measuring range, high precision, low cost, small volume and convenient maintenance and installation.
Description
Technical Field
The utility model relates to a sensor current measurement field especially relates to a zero magnetic flux TMR (Tunnel magnetic resistance) current detection sensor with quick demagnetization ability.
Background
The current detection sensor is an important device for providing current signals for electric energy metering, monitoring, controlling, protecting and the like of a power system, and the non-contact current detection sensor has important significance for monitoring and controlling a power grid.
Because of the existence of the magnetism gathering coil, the magnetic induction type current detection sensor has residual magnetism in the coil after the current measurement is completed every time, and the residual magnetism can influence the current measurement result next time. Therefore, it is necessary to demagnetize these remanence.
In addition, the existing current detection sensor has the defects of incapability of measuring direct current, easy saturation under large fault current, large volume, heavy weight and the like, and is difficult to meet the new development requirements of online detection, high-precision fault diagnosis and the like of a new generation of power system.
Disclosure of Invention
An object of the utility model is to overcome the problem that prior art exists, provide a zero magnetic flux TMR current detection sensor with quick demagnetization ability.
The utility model provides a its technical problem realize through following technical scheme:
a zero-flux TMR current detection sensor with rapid demagnetization capability is characterized in that: the magnetic circuit comprises a circular opening magnetic ring, a TMR chip, a differential amplification circuit, a power amplification circuit, a low-pass filter module, an AD sampling module, a main control unit, a feedback circuit, a power supply, a degaussing circuit and a magnetic gathering ring, wherein the TMR chip is positioned in an air gap opening of the circular opening magnetic ring, the output end of the TMR chip is connected with the input end of the differential amplification circuit and is used for receiving a magnetic signal of the current of a lead to be tested and converting the magnetic signal into a voltage signal and then sending the voltage signal to the differential amplification circuit, the output end of the differential amplification circuit is connected with the input end of the power amplification circuit and is used for outputting the voltage signal to the power amplification circuit, the output end of the power amplification circuit is connected with the input end of the low-pass filter module and is used for outputting the voltage signal to the low, the output end of the AD sampling module is connected with the input end of the TMR chip, the power supply supplies power to the TMR chip, the differential amplification circuit, the power amplification circuit and the low-pass filter module, the demagnetization circuit is charged, and the output end of the demagnetization circuit is connected with the input end of the magnetic flux collecting ring and used for demagnetizing the magnetic flux collecting ring.
Further, the differential amplifier circuit is used to amplify the output voltage of the TMR sensor and reduce zero drift.
Moreover, the model of the TMR chip is as follows: TMR 2705.
Moreover, the model of the main control unit is as follows: PIC16C5
The utility model discloses an advantage and beneficial effect do:
1. the TMR current detection sensor has the advantages of rapid demagnetization and high measurement accuracy. The utility model discloses an use the demagnetization circuit to handle the back to the coil, can eliminate remanence, improve measurement accuracy. By adopting a negative feedback structure, the feedback magnetic field compensates the magnetic field generated by the measured current, so that the synthetic magnetic field in the magnetic gathering ring is reduced, the output voltage of the TMR chip is reduced, the feedback current is reduced until the final feedback magnetic field and the main magnetic field are in dynamic balance, the current sensor works in a zero magnetic flux state, the purpose of quick demagnetization is realized, and the measurement precision of the current is improved.
TMR magnetic induction chip, for the fourth generation magnetic induction technique, its sensitivity, resolution ratio, power consumption, temperature characteristic all have more than 10 times promotion than the last generation product, and full chip level process control can provide reliable quality and reasonable price. Therefore, the utility model discloses an on using the TMR chip to the current detection sensor, can effectively promote modern power system current monitoring's precision. Meanwhile, due to the superior performance of the TMR chip, the whole sensor can realize the measurement of direct current and has the characteristics of low possibility of saturation, small volume and light weight.
2. This zero magnetic flow TMR current detection sensor with quick demagnetization ability, except that gather the magnetic ring all integrated on the circuit board, be convenient for dismouting, maintenance.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Description of reference numerals:
1-circular opening magnetic ring, 2-feedback coil, 3-current lead, 4-TMR chip, 5-sampling resistor.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
A zero-flux TMR current detection sensor with rapid demagnetization capability is characterized in that: the magnetic field measurement device comprises a circular opening magnetic ring 1, a TMR chip 4, a differential amplification circuit, a power amplification circuit, a low-pass filter module, an AD sampling module, a main control unit, a feedback circuit, a power supply, a degaussing circuit and a magnetic gathering ring, wherein the TMR chip is positioned in an air gap opening of the circular opening magnetic ring, the TMR chip receives a magnetic signal of current of a lead to be measured, converts the magnetic signal into a voltage signal and sends the voltage signal to the differential amplification circuit, the differential amplification circuit outputs the voltage signal to the power amplification circuit, the power amplification circuit outputs the voltage signal to the low-pass filter module, the low-pass filter module outputs the signal to a feedback circuit and the AD sampling module respectively, the feedback circuit sends the feedback signal to the TMR chip, the AD sampling module is connected with the main control unit, the power supply supplies power to the TMR chip, the differential amplification circuit, the, the demagnetizing circuit is used for demagnetizing the magnetic gathering ring connected with the demagnetizing circuit.
The current to be measured penetrates through the circular opening magnetic ring through the current lead 3, the TMR current sensor chip is positioned in an air gap opening of the circular opening magnetic ring, and a magnetic signal of the current to be measured is converted into a voltage signal, so that non-contact measurement of the current is realized. The amplifying circuit module is mainly composed of an operational amplifier and mainly used for amplifying the output voltage of the TMR chip and reducing zero drift. When the TMR current sensor works in a zero magnetic flux working state, the feedback coil 2 and the sampling resistor 5 need to be driven, and a power amplification circuit needs to be added to enable the feedback loop to work normally. In the closed-loop TMR current sensor, an enameled wire is wound on a magnetic gathering ring to form a feedback coil, and the coil has two functions, wherein one function is to generate a feedback signal to enable the TMR current sensor to work in a zero-magnetic-flux state. And secondly, demagnetizing the poly-magnetic ring. And finally, converting the digital signals into digital signals through an AD sampling module, and performing digital processing and signal characteristic extraction through a main control chip.
The current to be measured passes through the current lead from the center of the magnetic gathering ring, the magnetic field generated by the current lead is gathered by the magnetic gathering ring and then applied to the TMR chip, the TMR chip outputs a differential voltage, the voltage is amplified through the differential amplifying circuit, but the power in the voltage signal at the moment is small, the feedback coil in the feedback circuit cannot be driven, the current of the output signal needs to be amplified through a power amplifying circuit, the amplified feedback current flows into the feedback coil reversely wound on the magnetic gathering ring, and therefore the feedback magnetic field is generated. The feedback magnetic field compensates the magnetic field generated by the measured current, so that the synthetic magnetic field in the magnetic gathering ring is reduced, the output voltage of the TMR chip is reduced, and the feedback current is reduced until the feedback magnetic field and the main magnetic field are dynamically balanced. The whole negative feedback process is very short in time, so that the zero-flux TMR current sensor can have high response speed and high accuracy. And converting the voltage output value on the sampling resistor according to a certain proportion to obtain the measured current value.
As shown in figure 2, when in use, the TMR chip is placed at the gap position of the circular magnetic ring, the current straight lead passes through the circular magnetic ring, the generated magnetic field is gathered by the magnetic ring and then is applied to the TMR chip, and the TMR chip is connected with the amplifying circuit. The coil is wound on the circular magnetic gathering ring, one end of the circular magnetic gathering ring is connected with the feedback current, and the other end of the circular magnetic gathering ring is connected with the sampling resistor. And converting the voltage output value on the sampling resistor according to a certain proportion to obtain the measured current value.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (4)
1. A zero-flux TMR current detection sensor with rapid demagnetization capability is characterized in that: the magnetic circuit comprises a circular opening magnetic ring, a TMR chip, a differential amplification circuit, a power amplification circuit, a low-pass filter module, an AD sampling module, a main control unit, a feedback circuit, a power supply, a degaussing circuit and a magnetic gathering ring, wherein the TMR chip is positioned in an air gap opening of the circular opening magnetic ring, the output end of the TMR chip is connected with the input end of the differential amplification circuit and is used for receiving a magnetic signal of the current of a lead to be tested and converting the magnetic signal into a voltage signal and then sending the voltage signal to the differential amplification circuit, the output end of the differential amplification circuit is connected with the input end of the power amplification circuit and is used for outputting the voltage signal to the power amplification circuit, the output end of the power amplification circuit is connected with the input end of the low-pass filter module and is used for outputting the voltage signal to the low, the output end of the AD sampling module is connected with the input end of the TMR chip, the power supply supplies power to the TMR chip, the differential amplification circuit, the power amplification circuit and the low-pass filter module, the demagnetization circuit is charged, and the output end of the demagnetization circuit is connected with the input end of the magnetic flux collecting ring and used for demagnetizing the magnetic flux collecting ring.
2. The TMR current detection sensor with fast degaussing capability of claim 1, wherein: the differential amplification circuit is used for amplifying the output voltage of the TMR sensor and reducing zero drift.
3. The TMR current detection sensor with fast degaussing capability of claim 1, wherein: the model of TMR chip is: TMR 2705.
4. The TMR current detection sensor with fast degaussing capability of claim 1, wherein: the model of the main control unit is as follows: PIC16C 5.
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| CN202020486846.1U CN212379466U (en) | 2020-04-07 | 2020-04-07 | Zero-magnetic-flux TMR current detection sensor with rapid demagnetization capability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709370A (en) * | 2019-03-06 | 2019-05-03 | 宁波泰丰源电气有限公司 | A kind of anti-external magnetic field mutual inductor of electrical energy meter electricity minor |
| CN114487560A (en) * | 2022-04-06 | 2022-05-13 | 南方电网数字电网研究院有限公司 | Wide-range current measuring method and device based on closed-loop feedback type and current sensor |
| CN115327202A (en) * | 2022-07-08 | 2022-11-11 | 珠海多创科技有限公司 | TMR current sensor |
-
2020
- 2020-04-07 CN CN202020486846.1U patent/CN212379466U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709370A (en) * | 2019-03-06 | 2019-05-03 | 宁波泰丰源电气有限公司 | A kind of anti-external magnetic field mutual inductor of electrical energy meter electricity minor |
| CN114487560A (en) * | 2022-04-06 | 2022-05-13 | 南方电网数字电网研究院有限公司 | Wide-range current measuring method and device based on closed-loop feedback type and current sensor |
| CN114487560B (en) * | 2022-04-06 | 2022-07-12 | 南方电网数字电网研究院有限公司 | Wide-range current measuring method and device based on closed-loop feedback type and current sensor |
| CN115327202A (en) * | 2022-07-08 | 2022-11-11 | 珠海多创科技有限公司 | TMR current sensor |
| CN115327202B (en) * | 2022-07-08 | 2023-11-14 | 珠海多创科技有限公司 | TMR current sensor |
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