CN112666509A - Compensation system and method suitable for magnetic-sensing current sensor - Google Patents
Compensation system and method suitable for magnetic-sensing current sensor Download PDFInfo
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Abstract
本发明公开了一种适用于磁敏电流传感器的补偿系统：激励信号生成回路包括基准信号源和激励回路，基准信号源用于生成激励电流；多个激励回路均匀对称地安装于测量线圈，将激励电流和一次电流生成的磁场进行叠加后通过电阻接地；测量回路包括测量线圈和放大电路，测量线圈测量由一次电流和激励电流叠加后生成的磁场，并输出电信号至放大电路；通过放大电路将电信号进行放大，并将放大后的电信号转换为数字信号；信号处理单元包括分解单元和处理单元，分解单元用于通过计算将接收到的数字信号分离为激励信号和一次信号；处理单元基于激励信号和一次信号确定磁敏电阻芯片的实时误差数据，基于误差数据，确定调节电流输入的补偿绕组。
The invention discloses a compensation system suitable for a magneto-sensitive current sensor: an excitation signal generating circuit includes a reference signal source and an excitation circuit, and the reference signal source is used to generate excitation current; a plurality of excitation circuits are evenly and symmetrically installed on the measuring coil, and the The magnetic field generated by the excitation current and the primary current is superimposed and grounded through the resistance; the measurement circuit includes a measurement coil and an amplifier circuit, the measurement coil measures the magnetic field generated by the superposition of the primary current and the excitation current, and outputs an electrical signal to the amplifier circuit; through the amplifier circuit Amplify the electrical signal and convert the amplified electrical signal into a digital signal; the signal processing unit includes a decomposition unit and a processing unit, and the decomposition unit is used to separate the received digital signal into an excitation signal and a primary signal through calculation; the processing unit The real-time error data of the magnetoresistor chip is determined based on the excitation signal and the primary signal, and the compensation winding for adjusting the current input is determined based on the error data.
Description
Technical Field
The invention relates to the technical field of current measurement, in particular to a compensation system and method suitable for a magnetic-sensing current sensor.
Background
Current measurement is one of the most important basic supporting technologies of an electric power system, and is directly related to systems for control, protection, metering and the like of electric facilities. Common current measuring devices include hall current sensors, tunnel magnetoresistive current sensors, and the like, which calculate a primary current by measuring a magnetic field generated by a current carrying conductor. However, as the sensor is used, the magnetoresistance may age, which affects the measurement result, and therefore, an aging compensation unit needs to be designed in the magnetic resistance current sensor to improve the accuracy and stability of the current measurement. The current measuring device with the aging compensation unit has more excellent measurement performance in principle, and is suitable for application scenes of direct-current power distribution networks, direct-current charging piles of electric vehicles, ships and airplanes and the like.
Therefore, a technique is needed to achieve aging compensation for a magnetosensitive current sensor.
Disclosure of Invention
The technical scheme of the invention provides a compensation system and method for a magnetic-sensitive current sensor, which aim to solve the problem of aging compensation of the magnetic-sensitive current sensor.
In order to solve the above problems, the present invention provides a compensation system suitable for a magnetosensitive current sensor, the compensation system including: the device comprises an excitation signal generating circuit, a measuring circuit, a signal processing unit and a compensation winding;
the excitation signal generating circuit comprises a reference signal source and an excitation circuit, wherein the reference signal source is used for generating an excitation current; the excitation loops are uniformly and symmetrically arranged on the measuring coil, the magnetic fields generated by the excitation current and the primary current are superposed, and the electric signals generated by superposition are grounded through the excitation loops;
the measuring loop comprises a measuring coil and an amplifying circuit, the measuring coil measures a magnetic field generated by superposition of primary current and the exciting current in the measuring coil, and outputs an electric signal to the amplifying circuit; amplifying the electric signal through the amplifying circuit, and converting the amplified electric signal into a digital signal;
the signal processing unit comprises a decomposition unit and a processing unit, wherein the decomposition unit is used for separating the received digital signal into an excitation signal and a primary signal through calculation; the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that regulates current input based on the error data.
Preferably, the measuring coil measures a magnetic field generated by superposition of a primary current and the excitation current in the measuring coil, and includes: and the measuring coil measures a magnetic field generated by superposing the primary current and the excitation current in the measuring coil through a magnetic sensitive resistance chip.
Preferably, the number of the magnetic resistance chips is even, and the intervals between the adjacent magnetic resistance chips are the same.
Preferably, the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding adjusting the current input based on the error data, including:
calculating a feedback current based on the primary signal;
comparing the feedback current with the loop gain and the sensor design transformation ratio to determine real-time error data of the magnetic resistance chip;
based on the error data, a compensation winding that regulates the current input is determined.
Preferably, the compensation winding is wound on the measuring coil, receives a superimposed current of the feedback current and the regulating current, maintains a magnetic field in the measuring coil in a zero-flux state, and outputs an induced current of the magneto-dependent current sensor.
Based on another aspect of the present invention, the present invention provides a compensation method suitable for a magnetosensitive current sensor, the compensation method comprising:
establishing a compensation system, wherein the compensation system comprises an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding; the excitation signal generating circuit comprises a reference signal source and an excitation circuit; the measuring loop comprises a measuring coil and an amplifying circuit; the signal processing unit comprises a decomposition unit and a processing unit;
generating an excitation current by the reference signal source; uniformly and symmetrically installing a plurality of excitation loops on a measuring coil, superposing magnetic fields generated by the excitation current and the primary current, and grounding an electric signal generated by superposition through a resistor through the excitation loops;
measuring a magnetic field generated by superposing a primary current and the excitation current in the measuring coil through the measuring coil, and outputting an electric signal to the amplifying circuit; amplifying the electric signal through the amplifying circuit, and converting the amplified electric signal into a digital signal;
separating the received digital signal into an excitation signal and a primary signal by the decomposition unit calculation; the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that regulates current input based on the error data.
Preferably, the measuring coil measures a magnetic field generated by superposition of a primary current and the excitation current in the measuring coil, and includes: and the measuring coil measures a magnetic field generated by superposing the primary current and the excitation current in the measuring coil through a magnetic sensitive resistance chip.
Preferably, the number of the magnetic resistance chips is even, and the intervals between the adjacent magnetic resistance chips are the same.
Preferably, the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding adjusting the current input based on the error data, including:
calculating a feedback current based on the primary signal;
comparing the feedback current with the loop gain and the sensor design transformation ratio to determine real-time error data of the magnetic resistance chip;
based on the error data, a compensation winding that regulates the current input is determined.
Preferably, the compensation winding is wound on the measuring coil, receives a superimposed current of the feedback current and the regulating current, maintains a magnetic field in the measuring coil in a zero-flux state, and outputs an induced current of the magneto-dependent current sensor.
The technical scheme of the invention provides a compensation system and a method suitable for a magnetic-sensing current sensor, wherein the compensation system comprises: the device comprises an excitation signal generating circuit, a measuring circuit, a signal processing unit and a compensation winding; the excitation signal generating circuit comprises a reference signal source and an excitation circuit, wherein the reference signal source is used for generating an excitation current; the excitation loops are uniformly and symmetrically arranged on the measuring coil, magnetic fields generated by excitation current and primary current are superposed, and electric signals generated by superposition are grounded through the excitation loops; the measuring loop comprises a measuring coil and an amplifying circuit, the measuring coil measures a magnetic field generated by superposition of primary current and exciting current in the measuring coil and outputs an electric signal to the amplifying circuit; amplifying the electric signal through an amplifying circuit, and converting the amplified electric signal into a digital signal; the signal processing unit comprises a decomposition unit and a processing unit, wherein the decomposition unit is used for separating the received digital signal into an excitation signal and a primary signal through calculation; the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that regulates current input based on the error data. The technical scheme of the invention realizes automatic compensation of the aging error of the magnetic resistor and can improve the accuracy and stability of the current sensor.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a block diagram of a compensation system suitable for use in a magneto-sensitive current sensor, according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal processing unit according to a preferred embodiment of the present invention; and
fig. 3 is a flowchart of a compensation method for a magnetosensitive current sensor according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a block diagram of a compensation system for a magneto-dependent current sensor according to a preferred embodiment of the present invention. The embodiment of the invention is used for the magnetic resistance sensor applied to the power system, such as a Hall current sensor, a tunnel magneto-resistance current sensor and the like. The invention provides an aging compensation unit suitable for a magnetic-sensitive current sensor aiming at the defects of the existing technology of the magnetic-sensitive current sensor, wherein the aging compensation unit consists of an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding. The excitation signal generating loops are symmetrically distributed in the measuring coil and are beneficial to reducing the position error of the excitation current at the circle center of the circular ring. The measuring circuit can sense the superposed magnetic field generated by the exciting current and the primary current, digitize the measuring signal of the superposed magnetic field and is beneficial to subsequent signal processing. The signal processing unit extracts a signal component caused by the exciting current from the combined signal, and determines whether the magnetic sensitive chip generates an aging error according to the known exciting current; the compensation winding of the invention corrects the feedback current according to the error value. The invention is beneficial to maintaining good working performance of the magneto-dependent current sensor under the condition of device aging. The invention can be used for developing high-precision current sensors required in the wide fields of electric power systems, electric automobiles, precision instruments, chip manufacturing and the like. The invention realizes automatic compensation of aging error of the magnetic resistance and can improve accuracy and stability of the current sensor.
As shown in fig. 1, the present invention provides a compensation system suitable for a magneto-sensitive current sensor, the compensation system comprising: excitation signal generation circuit, measurement circuit, signal processing unit and compensation winding.
In fig. 1, 1 is a measurement coil, 2 is an even number of (8 pieces as an example) magneto-resistive chips (the distance from the center of the annular housing is the same and the distance between adjacent chips is the same) output in parallel, 3 is a compensation winding, 4 is a symmetrically installed excitation loop (4 pieces as an example), and the excitation loop is grounded through a resistor after coming out of the measurement coil.
The invention provides an aging compensation unit suitable for a magnetic-sensing current sensor, which consists of an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding.
The excitation signal generating circuit comprises a reference signal source and an excitation circuit, wherein the reference signal source is used for generating an excitation current; the excitation loops are uniformly and symmetrically arranged on the measuring coil, magnetic fields generated by the excitation current and the primary current are superposed, and electric signals generated by superposition are grounded through the excitation loops through the resistor.
The excitation signal generating loop of the invention consists of a reference signal source and an excitation loop. The reference signal source is responsible for generating low-frequency excitation current with specific waveform. A plurality of excitation loops are uniformly and symmetrically arranged in a measuring coil, excitation current generated by a reference signal source is superposed with a magnetic field generated by primary current input originally, and the excitation loops are combined and then grounded through a resistor.
The measuring loop comprises a measuring coil and an amplifying circuit, the measuring coil measures a magnetic field generated by superposition of primary current and exciting current in the measuring coil and outputs an electric signal to the amplifying circuit; the electric signal is amplified by the amplifying circuit, and the amplified electric signal is converted into a digital signal. Preferably, the measuring coil measures a magnetic field generated by superposition of the primary current and the excitation current in the measuring coil, and includes: the measuring coil measures a magnetic field generated by superposition of primary current and excitation current in the measuring coil through a magnetic sensitive resistance chip. Preferably, the number of the magnetic resistance chips is even, and the intervals between the adjacent magnetic resistance chips are the same.
The measuring loop of the invention consists of a measuring coil and an amplifying circuit. The measuring coil of the invention measures the magnetic field generated by the superposition of primary current and exciting current in the measuring coil through the magnetic sensitive resistance chip and outputs voltage. The amplifying circuit of the present invention amplifies the voltage and converts it into a corresponding digital signal.
The signal processing unit comprises a decomposition unit and a processing unit, wherein the decomposition unit is used for separating the received digital signal into an excitation signal and a primary signal through calculation; the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that regulates current input based on the error data.
Preferably, the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that adjusts the current input based on the error data, including:
calculating a feedback current based on the primary signal;
comparing the feedback current with the loop gain and the sensor design transformation ratio to determine real-time error data of the magnetic resistance chip;
based on the error data, a compensation winding is determined that regulates the current input.
Preferably, the compensation winding is wound on the measuring coil, receives a superimposed current of the feedback current and the regulating current, maintains the magnetic field in the measuring coil in a zero-flux state, and outputs an induced current of the magnetosensitive current sensor.
The compensation winding is wound on the measuring coil, receives the superposed current of the feedback current and the regulating current, maintains the magnetic field in the measuring coil in a zero magnetic flux state, and outputs corresponding current as the output of the magnetic-sensitive current sensor.
The signal processing unit of the invention is composed of a decomposition unit and a processing unit. The decomposition unit of the invention separates the excitation signal and the primary signal by calculation. The processing unit of the invention uses the excitation signal part to calculate the integral gain of the measuring loop of the magneto-dependent sensor, and the primary signal part to calculate the feedback current, and compares the loop gain with the preset transformation ratio of the sensor, thereby determining the real-time error of the magneto-dependent resistor chip. Based on this error data, a corresponding regulated current input compensation winding can be calculated. As shown in fig. 2.
The invention provides an aging compensation unit suitable for a magnetic-sensing current sensor, which consists of an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding. The excitation signal generating loops are symmetrically distributed in the measuring coil for a plurality of excitation loops, so that the position error of the excitation current at the circle center of the circular ring is reduced; the measuring circuit can sense the superposed magnetic field generated by the exciting current and the primary current, and digitize the measuring signal of the superposed magnetic field, thereby being beneficial to subsequent signal processing; the signal processing unit extracts a signal component caused by the exciting current from the combined signal, and determines whether the magnetic sensitive chip generates an aging error according to the known exciting current; the compensation winding of the invention corrects the feedback current according to the error value. The invention is beneficial to maintaining good working performance of the magneto-dependent current sensor under the condition of device aging. The invention can be used for developing high-precision current sensors required in the wide fields of electric power systems, electric automobiles, precision instruments, chip manufacturing and the like.
When the magneto-dependent current sensor of the aging compensation system is used for measuring current, the following steps are adopted:
step 1: a current is passed through a current-carrying conductor to be measured as shown in fig. 1, and the current to be measured generates a magnetic field in a direction of winding the axis of the conductor;
step 2: the reference current source shown in fig. 1 generates low-frequency excitation current with a specific waveform, and through 4 excitation loops uniformly distributed in the measuring coil, a reference current production magnetic field is superposed with a magnetic field produced by current to be measured, and then the excitation loops are grounded through a resistor. The position error of the reference current can be reduced by the excitation loops which are uniformly and symmetrically distributed;
and step 3: as shown in fig. 1, 8 uniformly distributed magnetic resistance chips installed in the measuring coil sense a magnetic field, output a measuring voltage, and amplify and convert the measuring voltage into a digital signal through an amplifying circuit;
and 4, step 4: the signal processing unit shown in fig. 2 receives the measurement signal and the decomposition unit separates the excitation signal portion and the primary signal portion by calculation. The processing unit uses the excitation signal part to calculate the integral gain of the measuring loop of the magneto-dependent sensor, the primary signal part is used to calculate the feedback current, and the real-time aging error of the magneto-dependent resistor chip can be determined by comparing the loop gain with the preset transformation ratio of the sensor. Based on this error data, a corresponding regulated current input compensation winding can be calculated;
and 5: the compensation winding shown in fig. 1 is fed with a certain feedback current, and the feedback current generates a magnetic field in the compensation winding, which is opposite to the direction of the magnetic field of the current to be measured, so that the measurement coil is in a zero-flux environment. The compensation current flowing through the compensation winding is measured through the measuring resistor, and the current flowing through the current-carrying conductor to be measured can be calculated.
Fig. 3 is a flowchart of a compensation method for a magnetosensitive current sensor according to a preferred embodiment of the present invention. As shown in fig. 3, the present invention provides a compensation method suitable for a magneto-dependent current sensor, the compensation method comprising:
step 301: establishing a compensation system, wherein the compensation system comprises an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding; the excitation signal generating circuit comprises a reference signal source and an excitation circuit; the measuring circuit comprises a measuring coil and an amplifying circuit; the signal processing unit includes a decomposition unit and a processing unit.
The invention provides an aging compensation unit suitable for a magnetic-sensing current sensor, which consists of an excitation signal generation circuit, a measurement circuit, a signal processing unit and a compensation winding.
Step 302: generating an excitation current through a reference signal source; a plurality of excitation loops are uniformly and symmetrically arranged on a measuring coil, magnetic fields generated by excitation current and primary current are superposed, and electric signals generated by superposition are grounded through resistors through the excitation loops.
The excitation signal generating loop of the invention consists of a reference signal source and an excitation loop. The reference signal source is responsible for generating low-frequency excitation current with specific waveform. A plurality of excitation loops are uniformly and symmetrically arranged in a measuring coil, excitation current generated by a reference signal source is superposed with a magnetic field generated by primary current input originally, and the excitation loops are combined and then grounded through a resistor.
Step 303: measuring a magnetic field generated by superposing the primary current and the excitation current in the measuring coil through the measuring coil, and outputting an electric signal to the amplifying circuit; amplifying the electric signal through an amplifying circuit, and converting the amplified electric signal into a digital signal; preferably, the measuring coil measures a magnetic field generated by superposition of the primary current and the excitation current in the measuring coil, and includes: the measuring coil measures a magnetic field generated by superposition of primary current and excitation current in the measuring coil through a magnetic sensitive resistance chip. Preferably, the number of the magnetic resistance chips is even, and the intervals between the adjacent magnetic resistance chips are the same.
The measuring loop of the invention consists of a measuring coil and an amplifying circuit. The measuring coil of the invention measures the magnetic field generated by the superposition of primary current and exciting current in the measuring coil through the magnetic sensitive resistance chip and outputs voltage. The amplifying circuit of the present invention amplifies the voltage and converts it into a corresponding digital signal.
Step 304: separating the received digital signal into an excitation signal and a primary signal by calculation of a decomposition unit; the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that regulates current input based on the error data.
Preferably, the processing unit determines real-time error data of the magneto-resistive chip based on the excitation signal and the primary signal, and determines a compensation winding that adjusts the current input based on the error data, including:
calculating a feedback current based on the primary signal;
comparing the feedback current with the loop gain and the sensor design transformation ratio to determine real-time error data of the magnetic resistance chip;
based on the error data, a compensation winding is determined that regulates the current input.
Preferably, the compensation winding is wound on the measuring coil, receives a superimposed current of the feedback current and the regulating current, maintains the magnetic field in the measuring coil in a zero-flux state, and outputs an induced current of the magnetosensitive current sensor.
The compensation winding is wound on the measuring coil, receives the superposed current of the feedback current and the regulating current, maintains the magnetic field in the measuring coil in a zero magnetic flux state, and outputs corresponding current as the output of the magnetic-sensitive current sensor.
The signal processing unit of the invention is composed of a decomposition unit and a processing unit. The decomposition unit of the invention separates the excitation signal and the primary signal by calculation. The processing unit of the invention uses the excitation signal part to calculate the integral gain of the measuring loop of the magneto-dependent sensor, and the primary signal part to calculate the feedback current, and compares the loop gain with the preset transformation ratio of the sensor, thereby determining the real-time error of the magneto-dependent resistor chip. Based on this error data, a corresponding regulated current input compensation winding can be calculated.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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| WO2025000680A1 (en) * | 2023-06-26 | 2025-01-02 | 中国电力科学研究院有限公司 | Alternating current/direct current multi-air-gap magnetoresistive current sensor and current measurement method |
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