CN110726869B - Wireless networking type current non-contact measuring device and method for magnetic sensing unit - Google Patents
Wireless networking type current non-contact measuring device and method for magnetic sensing unit Download PDFInfo
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Abstract
The invention discloses a wireless networking type current non-contact measuring device and method for a magnetic sensing unit, and the device comprises a flexible fixing support, the magnetic sensing unit and a collecting and receiving unit, wherein the magnetic sensing unit is arranged on the flexible fixing support, the magnetic sensing unit is connected through the collecting and receiving unit to form a closed loop, and the magnetic sensing unit is in communication connection with the collecting and receiving unit. When the device is used, the flexible fixing support carrying the magnetic sensing units is wound on a conductor to be detected and is connected through the collecting and receiving unit, so that a closed loop for detection is formed, a magnetic field exists around the conductor to be detected according to the ampere loop theorem, and the current in the conductor to be detected can be detected through numerical integration calculation of the measured value of each magnetic sensing unit in the closed loop. The design does not contain iron cores, the magnetic induction equipment has strong anti-interference capability and large detection range, and is not influenced by the shape of a detected conductor.
Description
Technical Field
The invention relates to the technical field of current measurement sensors, in particular to a wireless networking type current non-contact measurement device and method for a magnetic sensing unit.
Background
With the aggravation of the industrial electrification process, the demand of the current measurement technology is no longer limited in the power industry, and besides accurate measurement, different demands of various industries in the aspects of working environment, application convenience, volume and weight and the like are also required to be met. On the other hand, with the technology of MENS sensor chip integration, edge calculation, low-power wireless communication and the like becoming mature, the combination degree of the Internet of things and big data with various industrial productions is increasingly tight, and the functions of the Internet of things and big data are more and more prominent in the process of improving the industrial production efficiency and guaranteeing the reliability of key equipment. This also requires that the current measurement technology at the bottom layer of the internet of things has the characteristics of sensor, digitization, wireless communication and the like.
In the aspect of current measurement, the most applied devices are current transformers at present, but current transformers with different principles face application problems, for example, an electromagnetic current transformer has an iron core structure, the volume and weight are not acceptable in application occasions such as portable equipment, and ferromagnetic resonance, iron core magnetization and the like are caused; the Rogowski coil measurement principle cannot measure direct current signals and is easily influenced by external interference; the optical measurement principle has poor stability, and the technology cannot be developed and matured all the time. In addition, the current transformer needs to use current transformers with different designs for different measuring conductors and measuring currents, and the universality is poor. Finally, the measurement signal of the current transformer often needs to be additionally provided with a digital-to-analog conversion device to realize digitization, so that the measurement signal is difficult to play a role in the technology of the internet of things.
Based on the reasons, the broadband measurement can be realized, the device has the characteristics of flexible installation and plug and play, is suitable for various application environments, realizes the novel current measurement device with on-site digitization and wireless communication, and has wide application prospect in the background of the development of the internet of things.
Disclosure of Invention
The invention provides a wireless networking type current non-contact measuring device and method of a magnetic sensing unit, aiming at the defects in the prior art, the magnetic sensor is flexibly networked through a wireless technology, the detection of conductor currents in different environments and different shapes is realized, only a non-closed flexible measuring device is needed to be closed, a measured conductor penetrates through a closed loop formed by the measuring device, and the current measurement can be realized without considering the influences of installation conditions such as interference, core deviation and the like.
A wireless networking type current non-contact measuring device of a magnetic sensing unit comprises a flexible fixing support, the magnetic sensing unit and a collecting and receiving unit, wherein the magnetic sensing unit is arranged on the flexible fixing support, the magnetic sensing unit is connected through the collecting and receiving unit to form a closed loop, and the magnetic sensing unit is in communication connection with the collecting and receiving unit.
The design adopts a mode that a flexible fixing support carries a magnetic sensing unit to detect the current of a conductor, when in use, the flexible fixing support carrying the magnetic sensing unit is wound on a detected conductor and is connected through a collecting and receiving unit, so that a closed loop for detection is formed, a magnetic field exists around the detected conductor according to the ampere loop theorem, and the current in the detected conductor can be measured by carrying out numerical integration calculation on the measured value of each magnetic sensing unit in the closed loop. The existing measurement technology has the problems of measurement range, interference resistance, convenience, device size, weight and the like, the design does not contain an iron core, the magnetic induction equipment has strong interference resistance, the detection range is large, and the influence of the shape of a measured conductor is avoided.
Furthermore, the flexible fixing support is provided with a plurality of magnetic sensing units, the magnetic sensing units are arranged along the central axis of the flexible fixing support at equal intervals, the flexible fixing support is used for fixing the magnetic sensing units, the distance between every two magnetic sensing units is the same, and when all the magnetic sensing units form a closed loop, the distance between every two magnetic sensing units is also the same.
Further, the magnetic sensing unit includes a magnetic field sensor, a proximity sensor A, AD conversion module and a wireless communication module a, and the magnetic sensing unit is provided with a corresponding number, wherein:
the magnetic field sensor is used for detecting the magnetic field intensity of a space and outputting an analog signal corresponding to the magnetic field intensity;
the AD conversion module is used for converting the analog signal into a digital signal;
the proximity sensor A is used for detecting and judging the position of the collecting and receiving unit;
the wireless communication module A is used for sending the digital signals and the corresponding numbers to the collecting and receiving unit.
The magnetic field sensor, the proximity sensor A, AD conversion module, and the wireless communication module a are all in the prior art, the corresponding numbers set by the magnetic sensing units are codes that represent the sequence of each magnetic sensing unit, that is, the corresponding numbers are natural numbers or codes that can represent the sequence, and the corresponding numbers are stored in any storage module in the magnetic sensing units, for example, a storage module carried by the magnetic field sensor.
Further, the magnetic sensing unit further includes a temperature sensor, the temperature sensor is configured to detect a space temperature and perform temperature compensation on the magnetic field sensor, and the temperature sensor is in the prior art.
Further, the collection receiving unit includes a proximity sensor B, a wireless communication module B, and a processor, wherein:
the proximity sensor B is used for detecting and judging the position of the magnetic sensing unit;
the processor is used for calculating current value data according to the digital signals and the corresponding numbers and outputting the current value data;
the wireless communication module B is used for receiving the digital signals and the corresponding numbers and wirelessly transmitting and outputting the current value data.
Further, in order to adapt to various data transmission environments, the collecting and receiving unit further comprises a photoelectric conversion module and a DA conversion module, wherein:
the photoelectric conversion module is used for converting the current value data into an optical signal;
the DA conversion module is used for converting the current value data into an analog signal.
Preferably, the measuring sensitive shaft of the magnetic sensing unit is consistent with the central axis direction of the flexible fixing support, and the measuring sensitive shaft is the optimal sensing axis of the magnetic sensing unit in space.
Further, the collecting and receiving unit comprises a locking structure for fixing any two magnetic sensing units and forming a closed loop, the locking structure fixes the magnetic sensing units by connecting and locking the flexible fixing bracket, and the number of the locking structures can be multiple, and the connection mode is determined according to the number or the shape of the conductors to be detected.
Furthermore, in order to provide a plurality of measuring modes, a plurality of flexible fixing supports are arranged in series or in parallel, and can adapt to different testing environments or testing objects.
A wireless networking type current non-contact measuring method of a magnetic sensing unit is based on a wireless networking type current non-contact measuring device of the magnetic sensing unit, and comprises the following steps:
s1, fixing the magnetic sensing unit (2) and the collecting and receiving unit (3) around the tested conductor (4), and sending the corresponding serial number to the collecting and receiving unit (3) when the magnetic sensing unit (2) is triggered;
s2, the collection receiving unit judges and analyzes the topological structure of the closed path according to the received corresponding number, and sends a wake-up signal to the magnetic sensing unit in the closed path;
s3, the magnetic sensing unit which receives the wake-up signal starts to detect the magnetic field intensity of the space, converts the detected data into a digital sampling value sequence and sends the digital sampling value sequence to the collection receiving unit;
and S4, the collection receiving unit calculates a current value according to the closed path topological structure and the digital sampling value sequence.
The invention has the beneficial effects that:
1. the invention adopts a measuring mode of combining ampere's theorem with numerical integration, and the measuring result is only related to the current in the measured conductor, thus having strong anti-interference performance and stability;
2. the invention is non-contact measurement, does not directly act with the measured object, and does not affect the electrical continuity and safe operation of the measured object;
3. the invention belongs to space magnetic field measurement, and has the characteristics of wide screen band and low delay of the space magnetic field measurement;
4. the invention adopts the networking mode of the magnetic sensing units, and has the characteristics of flexibility, plug and use;
5. the invention has the capability of edge calculation and wireless communication, and can adapt to the development of the technology of the Internet of things.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an embodiment of the present invention;
FIG. 3 is a schematic view of another embodiment of the present invention.
In the attached figure, 1 is a flexible fixed support, 2 is a magnetic sensing unit, 3 is a collecting receiving unit, and 4 is a conductor to be detected.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
As shown in FIG. 1, the wireless networking type current non-contact measuring device of the magnetic sensing unit comprises a flexible fixing support 1, the magnetic sensing unit 2 and a collecting and receiving unit 3, wherein the magnetic sensing unit 2 is arranged on the flexible fixing support 1, the magnetic sensing unit 2 is connected through the collecting and receiving unit 3 to form a closed loop, and the magnetic sensing unit 2 is in communication connection with the collecting and receiving unit 3. The collecting and receiving unit 3 includes a locking structure for fixing any two of the magnetic sensing units 2 and forming a closed loop, the locking structure fixes the magnetic sensing units 2 by connecting and locking the flexible fixing bracket 1, and the number of the locking structures can be multiple, and the connection mode is determined according to the number or the shape of the conductor 4 to be detected.
When the current measuring device is used, the collecting and receiving unit 3 is an independent component, any two magnetic sensing units 2 on the flexible fixing support 1 are fixedly connected through the locking structure, the two fixed magnetic sensing units 2 are used as heads and tails, and the magnetic sensing units 2 penetrate through the space between the two fixed magnetic sensing units 2 to form a closed loop, so that the current measuring device can realize the function of adjusting the size and the shape at will. The collecting and receiving unit 3 can ensure that the distance between the two fixed magnetic sensing units 2 is equal to the distance between other adjacent sensors after locking.
The flexible fixing support 1 is provided with a plurality of magnetic sensing units 2, the magnetic sensing units 2 are arranged along the central axis of the flexible fixing support 1 at equal intervals, the flexible fixing support 1 is used for fixing the magnetic sensing units 2, the distance between every two magnetic sensing units 2 is the same, and when all the magnetic sensing units 2 form a closed loop, the distance between every two magnetic sensing units is also the same.
The magnetic sensing unit 2 comprises a magnetic field sensor, a proximity sensor A, AD conversion module and a wireless communication module a, the magnetic sensing unit 2 is provided with corresponding numbers, wherein: the magnetic field sensor is used for detecting the magnetic field intensity of a space and outputting an analog signal corresponding to the magnetic field intensity; the AD conversion module is used for converting the analog signal into a digital signal; the proximity sensor A is used for detecting and judging the position of the collecting and receiving unit 3; the wireless communication module a is configured to send the digital signal and the corresponding number to the collecting and receiving unit 3.
The magnetic field sensor, the proximity sensor A, AD conversion module, and the wireless communication module a are all in the prior art, the corresponding numbers set for the magnetic sensing units 2 are codes that represent the sequence of each magnetic sensing unit 2, that is, the corresponding numbers are natural numbers or codes that can represent the sequence, and the corresponding numbers are stored in any storage module in the magnetic sensing units 2, for example, a storage module carried by the magnetic field sensor. The magnetic sensing unit 2 further comprises a temperature sensor, the temperature sensor is used for detecting the space temperature and performing temperature compensation on the magnetic field sensor, and the temperature sensor is in the prior art.
The receiving unit 3 comprises a proximity sensor B, a wireless communication module B and a processor, wherein: the proximity sensor B is used to detect and determine the position of the magnetic sensing unit 2; the processor is used for calculating current value data according to the digital signals and the corresponding numbers and outputting the current value data; the wireless communication module B is used for receiving the digital signals and the corresponding numbers and wirelessly transmitting and outputting the current value data.
In order to adapt to various data transmission environments, the collecting and receiving unit 3 further includes a photoelectric conversion module and a DA conversion module, wherein: the photoelectric conversion module is used for converting the current value data into an optical signal; the DA conversion module is used for converting the current value data into an analog signal. The measuring sensitive shaft of the magnetic sensing unit 2 is consistent with the central axis direction of the flexible fixing support 1, and the measuring sensitive shaft is the optimal sensing axis of the magnetic sensing unit 2 in the space.
The power supply mode of the device is battery power supply and external power supply, the battery power supply can be used during temporary measurement, and the external power supply can be used during long-time measurement.
As shown in fig. 2, a wireless networking type current non-contact measurement method for a magnetic sensing unit is based on a wireless networking type current non-contact measurement device for a magnetic sensing unit, and comprises the following steps:
s1, fixing the magnetic sensing unit (2) and the collecting and receiving unit (3) around the tested conductor (4), and sending the corresponding serial number to the collecting and receiving unit (3) when the magnetic sensing unit (2) is triggered;
s2, the collection receiving unit 3 judges and analyzes the topological structure of the closed path according to the received corresponding number, and sends a wake-up signal to the magnetic sensing unit 2 in the closed path;
s3, the magnetic sensing unit 2 which receives the wake-up signal starts to detect the magnetic field intensity of the space, converts the detected data into a digital sampling value sequence and sends the digital sampling value sequence to the collection receiving unit 3;
and S4, the collection receiving unit 3 calculates a current value according to the closed path topology and the digital sampling value sequence.
The calculation of the current value signal used by the collecting and receiving unit 3 is performed according to the ampere loop theorem between the magnetic field and the current, which is as follows:
l is any closed path in space, B (r) is magnetic induction intensity at any point on the path, the sum of currents in a plane enclosed by l is i, and the line integral value of the magnetic induction intensity B (r) on the closed path l is the sum of currents i:
the specific method comprises the following steps:
the magnetic field value output by each magnetic sensing unit 2 is Bn, the integral path l formed by the flexible fixing support 1 fixed by the collecting and receiving unit 3 is discrete, the Bn is the magnetic field component on the integral path because the sensitivity direction of the magnetic sensing unit 2 is consistent with the direction of the axial central line of the flexible fixing support 1, and the magnetic field value output by each magnetic sensing unit 2 is integrated by adopting a numerical integration algorithm, so that the measured current value can be calculated.
In general, a compound trapezoidal formula or a compound simpson formula (for example, without limitation to the two formulas, the numerical integration formula is many, and the two formulas are the most widely used numerical integration formulas),
the calculation result of applying the composite trapezoidal formula is as follows:
the calculation result of the composite simpson formula is:
in the above two equations, l is the integration path length, m (or 2m) is the number of measurement points, and i is the corresponding number of the magnetic sensing unit 2.
Example 2
According to the wireless networking type current non-contact measuring device and method for the magnetic sensing units in the embodiment 1, when a plurality of conductors 4 to be measured are provided, the magnetic sensing units 2 are respectively surrounded by the flexible fixing support 1 and are fixed by using the locking structure of one or more collecting and receiving units 3, each collecting and receiving unit 3 can detect the current value in a closed loop or a path in communication connection with the collecting and receiving unit, as shown in fig. 3, two closed loops in a ring shape are formed on two conductors 4 to be measured, one collecting and receiving unit 3 can be fixed at the intersection point of the two ring shapes, at this time, 4 magnetic sensing units 2 are triggered, and the head and tail magnetic sensing units 2 in the two ring shapes can be determined by the corresponding numbers of the magnetic sensing units 2, so that the respective current values are respectively calculated.
In order to provide a plurality of measuring modes, a plurality of flexible fixing supports 1 are arranged in series or in parallel, and can adapt to different testing environments or testing objects; for example, the tested conductor 4 is too large in volume or too large in number, and a plurality of flexible fixing supports 1 can be connected in series or in parallel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A wireless networking type current non-contact measuring device of a magnetic sensing unit is characterized in that: the device comprises a flexible fixing support (1), a magnetic sensing unit (2) and a collecting receiving unit (3), wherein the magnetic sensing unit (2) is arranged on the flexible fixing support (1), the magnetic sensing unit (2) is connected through the collecting receiving unit (3) to form a closed loop, and the magnetic sensing unit (2) is in communication connection with the collecting receiving unit (3);
the flexible fixing support (1) is provided with a plurality of magnetic sensing units (2), and the magnetic sensing units (2) are arranged at equal intervals along the central axis of the flexible fixing support (1);
magnetic sensing unit (2) include magnetic field sensor, proximity sensor A, AD conversion module and wireless communication module A, magnetic sensing unit (2) are provided with corresponding serial number, wherein:
the magnetic field sensor is used for detecting the magnetic field intensity of a space and outputting an analog signal corresponding to the magnetic field intensity;
the AD conversion module is used for converting the analog signal into a digital signal;
the proximity sensor A is used for detecting and judging the position of the collecting and receiving unit (3);
the wireless communication module A is used for sending the digital signals and the corresponding numbers to the collecting and receiving unit (3);
the collection receiving unit (3) comprises a proximity sensor B, a wireless communication module B and a processor, wherein:
the proximity sensor B is used for detecting and judging the position of the magnetic sensing unit (2);
the processor is used for calculating current value data according to the digital signals and the corresponding numbers and outputting the current value data;
the wireless communication module B is used for receiving the digital signals and the corresponding numbers and wirelessly transmitting the current value data.
2. The wireless networking type current non-contact measurement device of the magnetic sensor unit according to claim 1, wherein: the magnetic sensing unit (2) further comprises a temperature sensor, and the temperature sensor is used for detecting the space temperature and performing temperature compensation on the magnetic field sensor.
3. The wireless networking type current non-contact measurement device of the magnetic sensor unit according to claim 1, wherein: the collection receiving unit (3) further comprises a photoelectric conversion module and a DA conversion module, wherein:
the photoelectric conversion module is used for converting the current value data into an optical signal;
the DA conversion module is used for converting the current value data into an analog signal.
4. The wireless networking type current non-contact measurement device of the magnetic sensor unit according to claim 1, wherein: the measuring sensitive shaft of the magnetic sensing unit (2) is consistent with the direction of the central axis of the flexible fixing support (1).
5. The wireless networking type current non-contact measurement device of the magnetic sensor unit according to claim 1, wherein: the collecting and receiving unit (3) comprises a locking structure which is used for fixing any two magnetic sensing units (2) and forming a closed loop.
6. The wireless networking type current non-contact measurement device of the magnetic sensor unit according to claim 1, wherein: a plurality of the flexible fixing supports (1) are arranged in series or in parallel.
7. A wireless networking type current non-contact measurement method of a magnetic sensor unit, comprising the wireless networking type current non-contact measurement device of the magnetic sensor unit according to any one of claims 1 to 6, comprising the steps of:
s1, fixing the magnetic sensing unit (2) and the collecting and receiving unit (3) around the tested conductor (4), and sending the corresponding serial number to the collecting and receiving unit (3) when the magnetic sensing unit (2) is triggered;
s2, the collection receiving unit (3) judges and analyzes the topological structure of the closed path according to the received corresponding number, and sends a wake-up signal to the magnetic sensing unit (2) in the closed path;
s3, the magnetic sensing unit (2) which receives the wake-up signal starts to detect the magnetic field intensity in the space, converts the detected data into a digital sampling value sequence and sends the digital sampling value sequence to the collection receiving unit (3);
s4, the collection receiving unit (3) calculates the current value according to the closed path topological structure and the digital sampling value sequence.
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| CN113009371B (en) * | 2021-03-16 | 2022-03-04 | 安徽江淮汽车集团股份有限公司 | Battery pack voltage disorder fault judgment method, device, equipment and storage medium |
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| EP2648006A4 (en) * | 2010-12-02 | 2017-11-29 | Alps Electric Co., Ltd. | Current sensor |
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