CN111257620A - Current detection device and method - Google Patents
Current detection device and method Download PDFInfo
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- CN111257620A CN111257620A CN202010127940.2A CN202010127940A CN111257620A CN 111257620 A CN111257620 A CN 111257620A CN 202010127940 A CN202010127940 A CN 202010127940A CN 111257620 A CN111257620 A CN 111257620A
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Abstract
The invention provides a current detection device and a method, wherein the current detection device is used for detecting a target current signal of a target current and comprises the following steps: at least two sensing units, each of which includes a tunneling magneto-resistance TMR; the detection unit is configured to generate a detection signal by the TMR induction magnetic field; a processing unit configured to acquire the detection signal generated by each of the detection units and determine the target current signal according to a plurality of the detection signals; the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located. The invention can solve the problem that the current detection process is greatly influenced by the external magnetic field in the related technology, thereby effectively reducing the influence of the external magnetic field in the current detection process and further improving the current detection precision.
Description
Technical Field
The invention relates to the field of electronics, in particular to a current detection device and a current detection method.
Background
The current sensor is different according to the measurement principle, and can be mainly divided into: shunts, electromagnetic current transformers, electronic current transformers, etc.; the electronic current transformer comprises a Hall current sensor, a Rogowski current sensor and an AnyWay variable frequency power sensor.
At present, the hall current sensor is widely applied, but the hall current sensor is easily interfered by an external magnetic field in the current measuring process, and has the problem of poor temperature characteristics. Aiming at the defects of the Hall current sensor, a current sensor based on a tunneling magneto-resistance (TMR) effect is developed, and the current sensor has obvious improvement in the aspects of sensitivity, resolution, power consumption, temperature characteristics and the like compared with the traditional Hall sensor. However, the current sensor based on the TMR effect in the related art still has a phenomenon that it is greatly affected by an external magnetic field.
In view of the above problem in the related art that the current detection process is greatly affected by the external magnetic field, no effective solution has been proposed in the related art.
Disclosure of Invention
The embodiment of the invention provides a current detection device and a current detection method, which are used for at least solving the problem that the current detection process in the related art is greatly influenced by an external magnetic field.
According to an embodiment of the present invention, there is provided a current detection apparatus for detecting a target current signal of a target current, the apparatus including:
at least two sensing units, each of which includes a tunneling magneto-resistance TMR; the detection unit is configured to generate a detection signal by the TMR induction magnetic field;
a processing unit configured to acquire the detection signal generated by each of the detection units and determine the target current signal according to a plurality of the detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
According to another embodiment of the present invention, there is also provided a current detection method for detecting a target current signal of a target current, the method including:
generating a detection signal by at least two detection units, wherein each detection unit comprises a tunneling magneto-resistance TMR; the detection signal is generated by the TMR induction magnetic field;
acquiring the detection signal generated by each detection unit, and determining the target current signal according to a plurality of detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
According to another embodiment of the present invention, there is also provided a current detection apparatus for detecting a target current signal of a target current, the apparatus including:
the detection module is used for generating detection signals through at least two detection units, wherein each detection unit comprises a tunneling magneto-resistance TMR; the detection signal is generated by the TMR induction magnetic field;
a determining module, configured to obtain the detection signal generated by each of the detecting units, and determine the target current signal according to a plurality of the detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
According to another embodiment of the present invention, a computer-readable storage medium is also provided, in which a computer program is stored, wherein the computer program is configured to perform the steps of any of the above-described method embodiments when executed.
According to another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, in the process of detecting the target current signal of the target current, the current detection device can respectively generate detection signals through the tunnel magneto-resistance TMR induction magnetic fields included by at least two detection units; further, acquiring a detection signal generated by each detection unit through a processing unit, and determining a target current signal according to a plurality of detection signals; the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located. Therefore, the invention can solve the problem that the current detection process is greatly influenced by the external magnetic field in the related technology, so as to effectively reduce the influence of the external magnetic field in the current detection process and further improve the current detection precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a functional schematic diagram of a current sensing device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a distribution of detecting units provided according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a detecting unit provided according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram (I) of a current detection device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram (two) of a current detection device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a magnetism collecting ring provided according to an embodiment of the present invention;
FIG. 7 is a flow chart of a current detection method provided according to an embodiment of the invention;
fig. 8 is a block diagram of a current detection apparatus according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
Fig. 1 is a functional schematic diagram of a current detection apparatus according to an embodiment of the present invention, as shown in fig. 1, the current detection apparatus in this embodiment includes:
at least two sense cells 102, each including a tunneling magneto-resistance TMR; the detection unit is configured to induce a magnetic field by the TMR to generate a detection signal;
a processing unit 104 configured to acquire the detection signal generated by each detection unit and determine a target current signal according to a plurality of detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
In the current detection device in this embodiment, the TMR in each detection unit can induce a magnetic field to generate a resistance change, and the current detection device in this embodiment can realize current detection of a target current according to a detection signal obtained by the TMR in different detection units inducing a magnetic field to generate a resistance change.
It should be further noted that the detection signal may be a voltage signal or a current signal; the above-mentioned process of TMR induction by a magnetic field generated by a current according to its TMR effect is known in the art, and therefore, it is not described herein.
It should be further noted that the first magnetic field is a magnetic field generated when the target current flows; the second magnetic field, that is, the interference magnetic field existing in the working space in which the current detection apparatus in this embodiment is located during application, specifically, the second magnetic field may be geomagnetism in the working space, or may be an external magnetic field existing in addition to the first magnetic field and the geomagnetism, that is, any magnetic field except for the magnetic field generated by the target current, all of which belong to the range covered by the second magnetic field.
It should be further described that, in the current detection apparatus of the present embodiment, both the detection unit and the processing unit may be mounted on the PCB to implement circuit configuration, and the processing unit may be formed by a microcontroller.
With the current detection device in this embodiment, since the current detection device can generate the detection signals respectively by the tunneling magneto-resistance TMR induction magnetic fields included in at least two detection units in the process of detecting the target current signal of the target current; further, acquiring a detection signal generated by each detection unit through a processing unit, and determining a target current signal according to a plurality of detection signals; the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located. Therefore, the current detection device in the embodiment can solve the problem that the current detection process is greatly influenced by the external magnetic field in the related art, so that the influence of the external magnetic field in the current detection process is effectively reduced, and the current detection precision is improved.
Specifically, the current detection device in the present embodiment obtains a plurality of detection signals by the induction of the magnetic field by the TMR in the plurality of detection cells to determine the target current signal of the target current. Because the plurality of detection units or the TMR devices in the detection units have difference among spatial positions in the setting process, the induction of the second magnetic field by the TMR in different detection units also has difference in the aspects of magnetic field direction and the like; based on this, in the process of determining the target current signal of the target current based on the multiple detection signals, the current detection apparatus in this embodiment may reduce the influence of the second magnetic field in the target current determination according to the difference of the second magnetic field in the detection signals corresponding to the different detection units, and further make the target current signal of the target current obtained by the processing unit be the current signal capable of reducing the external magnetic field interference to the greatest extent, so as to significantly improve the accuracy of the current detection.
It should be further noted that the current detection device in this embodiment is applicable to detection of direct current and also applicable to detection of alternating current, that is, the target current may be direct current or alternating current, which is not limited in this respect.
In an alternative embodiment, the processing unit 104 is further configured to,
acquiring a detection signal generated by each detection unit, and determining a first current signal according to a plurality of detection signals and a preset first processing model;
determining a second processing model according to the current value of the first current signal;
determining a second current signal according to the plurality of detection signals and the second processing model, and taking the second current signal as a target current signal;
the first processing model is used for indicating the relation between a current signal and a detection signal in a preset range, the second processing model is used for indicating the relation between a current signal and a detection signal in a sub-range, and the preset range is composed of a plurality of sub-ranges.
It should be further noted that, in the above alternative embodiment, the preset measuring range is the measuring range preset by the current detecting device in this embodiment, and the plurality of sub-ranges are consecutive segmented measuring ranges in the preset measuring range, for example, the preset measuring range is 0 to 200A, and the plurality of sub-ranges are 0 to 20A, 20 to 40A, and 40 to 80A … … 180 to 200A. Correspondingly, the first processing model is suitable for the relationship between the current signal and the detection signal within the preset range, for example, the relationship between the current signal and the detection signal within the current range of 0 to 200A; the second processing model is suitable for the relationship between the current signal and the detection signal in different sub-ranges of the preset range, for example, the relationship between the current signal and the detection signal in the current range of 20-40A, wherein each sub-range has the corresponding second processing model.
It should be further noted that the first process model and the second process model can be expressed as a multi-order function. The orders of the first processing module and the second processing module are specifically related to the number of the detection units.
In the above optional embodiment, since the first processing model is suitable for the test range of the current detection device, after the processing unit obtains the plurality of detection signals, the processing unit may further determine the first current signal according to the first processing model. It should be further noted that, since the first processing model is suitable for the full range of the preset range, the accuracy of the first current signal obtained by processing the plurality of detection signals according to the first processing model is not ideal. On the basis, the sub-range to which the first current signal belongs can be further determined according to the current value of the first current signal, and a second processing model corresponding to the sub-range is selected to process the detection signals again to obtain a second current signal; since the second processing model is a processing model for the sub-range where the target current signal is located, the second current signal can be output as the target current signal.
According to the technical scheme described in the embodiment, in the process of determining the target current signal according to the plurality of detection signals, the range of the target current signal can be determined according to the first processing model, and the value of the target current signal can be further determined by pertinently adopting the second processing model, so that the interference of the external magnetic field can be reduced through the plurality of detection signals, and the accuracy of current detection can be further improved.
In an alternative embodiment, the processing unit 104 is further configured to,
acquiring a first processing model and one or more second processing models according to the plurality of sampling current signals and the corresponding plurality of sampling detection signals;
the sampling current signal is a current signal of a sampling current preset in a preset range; the sampling detection signal is a detection signal generated by the detection unit when the target current is the sampling current.
It should be further noted that, in the above optional embodiment, the first processing model corresponding to the preset range and the plurality of second processing models corresponding to the plurality of sub-ranges are all pre-established; specifically, both the first processing model and the second processing model may be determined according to the detection of the current detection device in this embodiment on the sampling current, the sampling current is a current with a known current value, and the current value is the sampling current signal in the above optional embodiment, and correspondingly, the detection signals obtained by detecting the sampling current by the plurality of detection units in the current detection device are the sampling detection signals in the above optional embodiment. The establishment of the first process model and the second process model is further described below by way of an alternative embodiment.
In an alternative embodiment, the processing unit 104 is further configured to,
acquiring a first sampling current signal set and a first sampling detection signal set; the first sampling current signal set comprises sampling current signals of a plurality of sampling currents within a preset range, and the first sampling detection signal set comprises a plurality of sampling detection signals corresponding to the sampling current signals in the first sampling current signal set;
establishing a first processing model according to a plurality of sampling current signals in the first sampling current signal set and a plurality of corresponding sampling detection signals in the first sampling detection signal set;
acquiring a plurality of second sampling current signal sets and a plurality of second sampling detection signal sets; the plurality of second sampling current signal sets correspond to the plurality of sub-ranges, and the plurality of second sampling detection signal sets correspond to the plurality of sub-ranges; each second set of sampled current signals comprises sampled current signals of a plurality of sampled currents in a corresponding sub-range; each second set of sampled sense signals includes sampled sense signals for a plurality of sampled currents in a corresponding sub-range;
and establishing a second processing model corresponding to each sub-range according to the plurality of sampled current signals in the second sampled current signal set corresponding to each sub-range and the plurality of sampled detection signals in the second sampled detection signal set corresponding to each sub-range.
It should be further noted that, in the above optional embodiment, the establishing process of the first processing model is to select the sampling current within the preset range, for example, in a case that the preset range is 0 to 200A, the sampling current is selected within a range of 0 to 200A, a current value corresponding to the selected sampling current is the sampling current signal, and a plurality of sampling current signals within the preset range form the first sampling current signal set in the above optional embodiment; correspondingly, the current detection device in this embodiment detects the sampling current within the selected preset range to obtain a detection signal, which is a sampling detection signal, and the plurality of sampling detection signals form the first sampling detection signal set in the optional embodiment. It should be noted that, for a certain sampling current, the sampling current signal is unique, and a plurality of sampling detection signals exist according to different detection units, so that the sampling current signal needs to correspond to the plurality of sampling detection signals.
It should be noted that, when the sampling current is selected in the preset range, the sampling current needs to be selected as uniformly as possible in the preset range.
Through the first sampling current signal set and the first sampling detection signal set, a plurality of sampling current signals within a preset range and a plurality of sampling detection signals corresponding to each sampling current signal can be obtained. Based on this, a fitting manner, such as a least squares fitting manner, may be further adopted to determine the relationship between the sampled current signal and the plurality of sampled detection signals, i.e., to establish the first processing model in the above-mentioned alternative embodiment.
Similarly, in the above optional embodiment, the establishing process of the second processing model is to select a plurality of sampling currents in the sub-range corresponding to the second processing model, for example, in the case that the preset range is 0 to 200A, for the sub-range 40 to 80A, the sampling current is selected in the range of 40 to 80A, the current value corresponding to the selected sampling current is the sampling current signal, and the plurality of sampling current signals in the sub-range form a second sampling current signal set in the above optional embodiment. And performing the above processing on different sub-ranges in the preset range to obtain a second sampling current signal set corresponding to each sub-range. Correspondingly, the current detection device in this embodiment detects the selected sampling current to obtain a detection signal, which is a sampling detection signal, and the multiple sampling detection signals in the sub-range form the second sampling detection signal set in the optional embodiment. And performing the above processing on different sub-ranges in the preset range to obtain a second sampling detection signal set corresponding to the second sampling current signal set corresponding to each sub-range. It should be noted that, for a certain sampling current, the sampling current signal is unique, and a plurality of sampling detection signals exist according to different detection units, so that the sampling current signal needs to correspond to the plurality of sampling detection signals.
It should be noted that when the sampling current is selected in the above-mentioned predetermined range, the sampling current is selected as uniformly as possible in the corresponding sub-range, such as 40 to 80A.
Through the second sampling current signal set and the second sampling detection signal set corresponding to the certain sub-range, a plurality of second sampling current signals and a plurality of second sampling detection signals corresponding to each second sampling current signal can be obtained. Based on this, a fitting, such as a least squares fitting, may be further adopted to determine a relationship between the second sampled current signal and the plurality of second sampled detected signals in the sub-range, i.e., to establish a second processing model corresponding to the sub-range.
And processing each sub-range in the preset range to obtain a second processing model corresponding to each sub-range.
For example, for a current detection device with a preset range of 0 to 200A, a function model between a preset target current signal and a detection signal is I-B0 + B1V 1+ B2V 2, where I is the target current signal, V1 and V2 are the detection signals, the above-mentioned B0, B1 and B2 are coefficients of a processing model, and B0, B1 and B2 are collectively referred to as a coefficient B hereinafter. It should be further noted that the difference between the first processing model and the second processing model is represented by the difference of the coefficient B.
Sampling currents are selected within the range of 0 to 200A, for example, 1A is selected as an interval, 201 sampling currents with sampling current values of 0A, 1A, 2A … … 199A and 200A are selected, detection signals corresponding to each sampling current, namely 0A-V1/V2 and 1A-V1/V2 … … 200A-V1/V2, are respectively obtained through a current detection device, and therefore least square fitting is carried out through the 201-group corresponding relation to establish a first processing model so as to obtain a coefficient B1 in the first processing model.
Taking a sub-range of 20 to 40A in the preset range as an example, sampling currents are selected in a range of 20 to 40A, for example, 1A is taken as an interval, 21 sampling currents with sampling current values of 20A and 21A … … 40A are selected, and a detection signal corresponding to each sampling current, namely 20A-V1/V2 and 21A-V1/V2 … … 40A-V1/V2, is respectively obtained through a current detection device, so that a second processing model corresponding to 20 to 40A is established by fitting through the 21-group corresponding relationship, and a coefficient B2 in the second processing model is obtained. By performing the above operation on each sub-range in the preset range, the second processing model corresponding to each sub-range can be obtained.
Through the technical scheme described in the optional embodiment, on one hand, the first processing model and the second processing model can be accurately established respectively aiming at the preset measuring range and the sub-measuring range in a fitting mode, so that the accuracy of current detection is improved; on the other hand, in the above alternative embodiment, the first processing model and the second processing model are established by fitting, and are not limited by the strict assembly or position relationship between the detection signals generated by the plurality of detection units; therefore, in the actual detection process of the current detection apparatus in this embodiment, the pre-established first processing model and the second processing model can obtain the corresponding target current signal according to the plurality of detection signals, so as to avoid that the detection signals generated by the current detection apparatus due to the assembly errors among the plurality of detection units cannot effectively reduce the influence of external geomagnetism in the calculation process. Therefore, the assembly cost in the production and manufacturing process can be reduced and the detection precision in the current detection process can be improved through the technical scheme described in the optional embodiment.
In addition, the method of determining the target current signal by the pre-established first processing model and the pre-established second processing model can limit the position arrangement mode among the plurality of detection units on the basis, and meanwhile, the interference mode of the external magnetic field is not limited, so that the applicability of the current detection unit in the embodiment is improved.
In an alternative embodiment, fig. 2 is a schematic distribution diagram of the detecting units according to an embodiment of the present invention, and as shown in fig. 2, the detecting unit 102 includes a first detecting unit 1022 and a second detecting unit 1024; wherein, the magnetic sensitivity direction of the first detecting unit 1022 and the magnetic sensitivity direction of the second detecting unit 1024 are parallel and opposite to each other.
As shown in fig. 2, the connection terminal 106 is used for conducting a target current, the first detection unit and the second detection unit are respectively disposed above and below the connection terminal 106, and the first detection unit and the second detection unit are symmetrically disposed; based on the position setting, the first detection unit and the second detection unit can respectively induce the first magnetic field generated by the target current in the process of detecting the target current flowing through the wiring terminal, and simultaneously form symmetrical induction results for external magnetic fields, such as geomagnetism and the like, of the position where the wiring terminal is located, so that the influence of the geomagnetism can be more effectively reduced in the process of determining the target current signal by the processing unit according to detection signals generated by the first detection unit and the second detection unit.
In an alternative embodiment, fig. 3 is a schematic structural diagram of a detecting unit according to an embodiment of the present invention, and as shown in fig. 3, the detecting unit 102 adopts a wheatstone bridge structure composed of four resistors (Ra, Rb, Rc, Ru), where the resistor Ru is TMR.
In an alternative embodiment, the detection signal 102 is a differential voltage signal across a wheatstone bridge.
It should be further noted that, in the above alternative embodiment, the TMR in the wheatstone bridge may induce the magnetic field including the first magnetic field and the second magnetic field to generate the resistance value change, so as to change the differential voltage across the wheatstone bridge, i.e. the voltage between Vo-and Vo + shown in fig. 3; the variation of the differential voltage across the wheatstone bridge forms the output differential voltage signal, i.e. the detection signal.
In an alternative embodiment, fig. 4 is a schematic structural diagram (a) of a current detection apparatus provided in an embodiment of the present invention, and as shown in fig. 4, the current detection apparatus in this embodiment further includes:
at least two Printed Circuit Board (PCB) boards 106, wherein a plurality of detection units are respectively connected with corresponding PCB boards 108;
and the current-carrying copper bars 108 are arranged among the plurality of PCB boards 106, and the current-carrying copper bars 108 are configured to carry target current.
It should be further noted that, in the above alternative embodiment, the current-carrying copper bar is arranged to replace the terminal, so that the current-carrying capacity of the current detection device in this embodiment is significantly improved.
In an alternative embodiment, fig. 5 is a schematic structural diagram (ii) of a current detection apparatus provided according to an embodiment of the present invention, and as shown in fig. 5, the detection unit 102 is disposed between the PCB 106 and the current-carrying copper plate 108.
It should be further noted that, by the technical solutions described in the above optional embodiments, the detection unit is configured to form an embedded structure, so that on the basis of improving the structural stability of the detection unit, the distance between the detection unit and the target current in the current-carrying copper bar is closer than that of the external detection unit, and thus the error of current detection is further reduced.
In an optional embodiment, the current detecting apparatus in this embodiment further includes:
the magnetic flux collecting ring comprises a magnetic flux collecting ring body 110, the magnetic flux collecting ring body 110 is of an annular structure, an air gap 1102 is arranged in the magnetic flux collecting ring body 110, and the detection unit 102 is arranged in the air gap 1102.
Fig. 6 is a schematic structural diagram of a magnetic convergence ring provided in accordance with an embodiment of the present invention, as shown in fig. 6. Through the arrangement of the magnetism-gathering ring in the optional embodiment, on one hand, the interference of external geomagnetism such as the geomagnetism on the detection of the detection unit can be further reduced, and on the other hand, the arrangement of the magnetism-gathering ring can increase the value of the detection signal generated by the detection unit under the same target current, so that the sensitivity and the resolution of the current detection device in the embodiment can be improved.
Example 2
The present embodiment provides a current detection method for detecting a target current signal of a target current, and fig. 6 is a flowchart of the current detection method according to the embodiment of the present invention, as shown in fig. 6, the current detection method in the embodiment includes:
s202, generating a detection signal by at least two detection units, wherein each detection unit comprises a tunneling magneto-resistance TMR; the detection signal is generated by TMR induction magnetic field;
s204, acquiring the detection signal generated by each detection unit, and determining a target current signal according to a plurality of detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
It should be further noted that other optional embodiments and technical effects of the current detection method described in this embodiment correspond to those of the current detection apparatus described in embodiment 1, and therefore are not described herein again.
In an alternative embodiment, the determining the target current signal according to the plurality of detection signals in step S204 includes:
acquiring a detection signal generated by each detection unit, and determining a first current signal according to a plurality of detection signals and a preset first processing model;
determining a second processing model according to the current value of the first current signal;
determining a second current signal according to the plurality of detection signals and the second processing model, and taking the second current signal as a target current signal;
the first processing model is used for indicating the relation between a current signal and a detection signal in a preset range, the second processing model is used for indicating the relation between a current signal and a detection signal in a sub-range, and the preset range is composed of a plurality of sub-ranges.
In an optional embodiment, before determining the target current signal according to the plurality of detection signals in step S204, the method further includes:
acquiring a first processing model and one or more second processing models according to the plurality of sampling current signals and the corresponding plurality of sampling detection signals;
the sampling current signal is a current signal of a sampling current preset in a preset range; the sampling detection signal is a detection signal generated by the detection unit when the target current is the sampling current.
In an optional embodiment, the obtaining the first processing model and the one or more second processing models according to the plurality of sampled current signals and the corresponding plurality of sampled detection signals includes:
acquiring a first sampling current signal set and a first sampling detection signal set; the first sampling current signal set comprises sampling current signals of a plurality of sampling currents within a preset range, and the first sampling detection signal set comprises a plurality of sampling detection signals corresponding to the sampling current signals in the first sampling current signal set;
establishing a first processing model according to a plurality of sampling current signals in the first sampling current signal set and a plurality of corresponding sampling detection signals in the first sampling detection signal set;
acquiring a plurality of second sampling current signal sets and a plurality of second sampling detection signal sets; the plurality of second sampling current signal sets correspond to the plurality of sub-ranges, and the plurality of second sampling detection signal sets correspond to the plurality of sub-ranges; each second set of sampled current signals comprises sampled current signals of a plurality of sampled currents in a corresponding sub-range; each second set of sampled sense signals includes sampled sense signals for a plurality of sampled currents in a corresponding sub-range;
and establishing a second processing model corresponding to each sub-range according to the plurality of sampled current signals in the second sampled current signal set corresponding to each sub-range and the plurality of sampled detection signals in the second sampled detection signal set corresponding to each sub-range.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 3
The present embodiment provides a current detection apparatus for detecting a target current signal of a target current, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and the description of the apparatus is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 3 is a block diagram of a current detection device according to an embodiment of the present invention, and as shown in fig. 3, the current detection device in the embodiment includes:
a sensing module 302 for generating a sensing signal by at least two sensing cells, wherein each sensing cell comprises a tunneling magneto-resistance TMR; the detection signal is generated by TMR induction magnetic field;
a determining module 304, configured to obtain the detection signal generated by each detection unit, and determine a target current signal according to a plurality of detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
It should be further noted that other optional embodiments and technical effects of the current detection apparatus described in this embodiment correspond to those of the current detection method described in embodiment 2, and therefore are not described herein again.
In an alternative embodiment, the determining the target current signal according to the plurality of detection signals in step S204 includes:
acquiring a detection signal generated by each detection unit, and determining a first current signal according to a plurality of detection signals and a preset first processing model;
determining a second processing model according to the current value of the first current signal;
determining a second current signal according to the plurality of detection signals and the second processing model, and taking the second current signal as a target current signal;
the first processing model is used for indicating the relation between a current signal and a detection signal in a preset range, the second processing model is used for indicating the relation between a current signal and a detection signal in a sub-range, and the preset range is composed of a plurality of sub-ranges.
In an optional embodiment, before determining the target current signal according to the plurality of detection signals in step S204, the method further includes:
acquiring a first processing model and one or more second processing models according to the plurality of sampling current signals and the corresponding plurality of sampling detection signals;
the sampling current signal is a current signal of a sampling current preset in a preset range; the sampling detection signal is a detection signal generated by the detection unit when the target current is the sampling current.
In an optional embodiment, the obtaining the first processing model and the one or more second processing models according to the plurality of sampled current signals and the corresponding plurality of sampled detection signals includes:
acquiring a first sampling current signal set and a first sampling detection signal set; the first sampling current signal set comprises sampling current signals of a plurality of sampling currents within a preset range, and the first sampling detection signal set comprises a plurality of sampling detection signals corresponding to the sampling current signals in the first sampling current signal set;
establishing a first processing model according to a plurality of sampling current signals in the first sampling current signal set and a plurality of corresponding sampling detection signals in the first sampling detection signal set;
acquiring a plurality of second sampling current signal sets and a plurality of second sampling detection signal sets; the plurality of second sampling current signal sets correspond to the plurality of sub-ranges, and the plurality of second sampling detection signal sets correspond to the plurality of sub-ranges; each second set of sampled current signals comprises sampled current signals of a plurality of sampled currents in a corresponding sub-range; each second set of sampled sense signals includes sampled sense signals for a plurality of sampled currents in a corresponding sub-range;
and establishing a second processing model corresponding to each sub-range according to the plurality of sampled current signals in the second sampled current signal set corresponding to each sub-range and the plurality of sampled detection signals in the second sampled detection signal set corresponding to each sub-range.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 4
Embodiments of the present invention also provide a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to perform the steps of any of the above-mentioned method embodiments when executed.
Alternatively, in this embodiment, the computer-readable storage medium may be configured to store a computer program for executing the method steps recited in the above embodiments:
optionally, in this embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Example 5
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Alternatively, in this embodiment, the processor may be configured to execute the method steps recited in the above embodiments through a computer program.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A current sensing apparatus for sensing a target current signal of a target current, the apparatus comprising:
at least two sensing units, each of which includes a tunneling magneto-resistance TMR; the detection unit is configured to generate a detection signal by the TMR induction magnetic field;
a processing unit configured to acquire the detection signal generated by each of the detection units and determine the target current signal according to a plurality of the detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
2. The apparatus of claim 1, wherein the processing unit is further configured to,
acquiring the detection signal generated by each detection unit, and determining a first current signal according to a plurality of detection signals and a preset first processing model;
determining a second processing model according to the current value of the first current signal;
determining a second current signal according to the plurality of detection signals and the second processing model, and taking the second current signal as the target current signal;
the first processing model is used for indicating the relation between a current signal in a preset range and the detection signal, the second processing model is used for indicating the relation between a current signal in a sub-range and the detection signal, and the preset range is formed by the sub-ranges.
3. The apparatus of claim 2, wherein the processing unit is further configured to,
acquiring the first processing model and one or more second processing models according to a plurality of sampling current signals and a plurality of corresponding sampling detection signals;
the sampling current signal is a current signal of a sampling current preset in the preset measuring range; the sampling detection signal is a detection signal generated by the detection unit when the target current is the sampling current.
4. The apparatus of claim 3, wherein the processing unit is further configured to,
acquiring a first sampling current signal set and a first sampling detection signal set; wherein the first set of sampled current signals includes the sampled current signals for a plurality of the sampled currents within the preset range, and the first set of sampled detected signals includes a plurality of the sampled detected signals corresponding to a plurality of the sampled current signals in the first set of sampled current signals;
establishing a first processing model based on a plurality of the sampled current signals in the first set of sampled current signals and a corresponding plurality of the sampled sense signals in the first set of sampled sense signals;
acquiring a plurality of second sampling current signal sets and a plurality of second sampling detection signal sets; wherein the plurality of second sets of sampled current signals correspond to the plurality of sub-ranges and the plurality of second sets of sampled sense signals correspond to the plurality of sub-ranges; each of the second sets of sampled current signals comprises the sampled current signal for a plurality of the sampled currents in the corresponding sub-range; each of the second sets of sampled sense signals includes the sampled sense signal for a plurality of the sampled currents in the corresponding sub-range;
and establishing the second processing model corresponding to each sub-range according to a plurality of the sampled current signals in the second sampled current signal set corresponding to each sub-range and a plurality of the sampled detection signals in the second sampled detection signal set corresponding to each sub-range.
5. The apparatus according to any one of claims 1 to 4, wherein the detection unit comprises a first detection unit and a second detection unit; wherein the magnetic sensitivity direction of the first detection unit and the magnetic sensitivity direction of the second detection unit are parallel and opposite to each other.
6. A current sensing method for sensing a target current signal of a target current, the method comprising:
generating a detection signal by at least two detection units, wherein each detection unit comprises a tunneling magneto-resistance TMR; the detection signal is generated by the TMR induction magnetic field;
acquiring the detection signal generated by each detection unit, and determining the target current signal according to a plurality of detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
7. The method of claim 6, wherein said determining the target current signal from a plurality of the detection signals comprises:
acquiring the detection signal generated by each detection unit, and determining a first current signal according to a plurality of detection signals and a preset first processing model;
determining a second processing model according to the current value of the first current signal;
determining a second current signal according to the plurality of detection signals and the second processing model, and taking the second current signal as the target current signal;
the first processing model is used for indicating the relation between a current signal in a preset range and the detection signal, the second processing model is used for indicating the relation between a current signal in a sub-range and the detection signal, and the preset range is formed by the sub-ranges.
8. A current sensing apparatus for sensing a target current signal of a target current, the apparatus comprising:
the detection module is used for generating detection signals through at least two detection units, wherein each detection unit comprises a tunneling magneto-resistance TMR; the detection signal is generated by the TMR induction magnetic field;
a determining module, configured to obtain the detection signal generated by each of the detecting units, and determine the target current signal according to a plurality of the detection signals;
the magnetic field comprises a first magnetic field and a second magnetic field, the first magnetic field is a magnetic field generated by the target current, and the second magnetic field is an interference magnetic field in a space where the device is located.
9. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to carry out the method of any one of claims 1 to 5 when executed.
10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 5.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435265A (en) * | 2011-09-19 | 2012-05-02 | 苏州聚元微电子有限公司 | Precision correction method for transit time ultrasonic flowmeter |
| CN103175547A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Parameter fitting method of data acquisition device |
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN106969812A (en) * | 2017-04-05 | 2017-07-21 | 深圳市美好创亿医疗科技有限公司 | Flow sensor calibration method and system |
| CN109212296A (en) * | 2018-10-23 | 2019-01-15 | 电子科技大学 | A kind of non-contact electric current measurement device monitored simultaneously suitable for three-phase current |
| CN109444510A (en) * | 2018-11-05 | 2019-03-08 | 电子科技大学 | A kind of non-contact electric current measurement device suitable for smart grid protection system |
| CN109752586A (en) * | 2019-03-13 | 2019-05-14 | 无锡乐尔科技有限公司 | Current detection means based on PCB |
| CN110045168A (en) * | 2019-04-11 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of current sensor apparatus and measurement method based on TMR tunnel magnetoresistance device |
-
2020
- 2020-02-28 CN CN202010127940.2A patent/CN111257620A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435265A (en) * | 2011-09-19 | 2012-05-02 | 苏州聚元微电子有限公司 | Precision correction method for transit time ultrasonic flowmeter |
| CN103175547A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Parameter fitting method of data acquisition device |
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN106969812A (en) * | 2017-04-05 | 2017-07-21 | 深圳市美好创亿医疗科技有限公司 | Flow sensor calibration method and system |
| CN109212296A (en) * | 2018-10-23 | 2019-01-15 | 电子科技大学 | A kind of non-contact electric current measurement device monitored simultaneously suitable for three-phase current |
| CN109444510A (en) * | 2018-11-05 | 2019-03-08 | 电子科技大学 | A kind of non-contact electric current measurement device suitable for smart grid protection system |
| CN109752586A (en) * | 2019-03-13 | 2019-05-14 | 无锡乐尔科技有限公司 | Current detection means based on PCB |
| CN110045168A (en) * | 2019-04-11 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of current sensor apparatus and measurement method based on TMR tunnel magnetoresistance device |
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