CN111736003A - Current sampling device, system and current sampling method - Google Patents
Current sampling device, system and current sampling method Download PDFInfo
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- CN111736003A CN111736003A CN202010574857.XA CN202010574857A CN111736003A CN 111736003 A CN111736003 A CN 111736003A CN 202010574857 A CN202010574857 A CN 202010574857A CN 111736003 A CN111736003 A CN 111736003A
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Abstract
The application relates to a current sampling device, a system and a current sampling method, wherein the current sampling device comprises: the current collection device comprises a plurality of current collectors which are sequentially connected in series, and the current collection device is connected in series in a working circuit. When the current in the working line is too small, the partial pressure of the current acquisition equipment is increased through the internal resistances of the current collectors, then the working voltages at the two ends of the current acquisition equipment are detected through the voltage acquisition equipment, and finally the current of the working line can be calculated only by calculating the ratio between the working voltage and the total internal resistances of the current collectors through the processing equipment. The current sampling device provided by the embodiment of the application solves the technical problem that the current in the light-load working line can not be sampled in the prior art, and achieves the technical effect of conveniently and effectively collecting the current in the light-load working line.
Description
Technical Field
The present application relates to the field of electrical equipment technologies, and in particular, to a current sampling device, a current sampling system, and a current sampling method.
Background
Current sampling is a commonly used technical means in circuits and electrical equipment, and in a power grid system, current sampling in a circuit is mainly performed by using a measuring device such as an ammeter, for example, a method of connecting a single resistor in series, a hall sensor, and the like. Although the existing current sampling method can meet the sampling requirement of current in a larger numerical range, the current in a light-load working line is very weak, and when the current is small enough, the current is no longer located in the acquisition range of the current acquisition equipment, and the current in the working line cannot be acquired, so that the current in the light-load working line cannot be sampled.
Disclosure of Invention
In view of the above, it is necessary to provide a current sampling device, a system and a current sampling method for solving the problem that the current in the light-load working line cannot be sampled.
A current sampling device for sampling current of a working line, the current sampling device comprising:
the current collecting device is connected in the working circuit in series and comprises a plurality of current collectors which are connected in series;
the voltage acquisition equipment is connected with the current acquisition equipment in parallel and is used for acquiring working voltages at two ends of the current acquisition equipment;
and the processing equipment is in signal connection with the voltage acquisition equipment and is used for determining the current of the working line according to the internal resistances of the plurality of current collectors and the working voltage.
In one embodiment, the voltage collecting device comprises a plurality of voltage collecting components, the number of the voltage collecting components is the same as that of the current collectors, and one voltage collecting component is connected with one current collector in parallel; and the voltage acquisition assemblies are respectively in signal connection with the processing equipment.
In one embodiment, the voltage acquisition equipment comprises a plurality of voltage acquisition components, the number of the voltage acquisition components is less than that of the current collectors, one voltage acquisition component is connected with M adjacent current collectors in parallel, wherein M is a positive integer not less than 1; and the voltage acquisition assemblies are respectively in signal connection with the processing equipment.
In one embodiment, the method further comprises the following steps:
the input end of the operational amplification device is in signal connection with the voltage acquisition assemblies respectively, the output end of the operational amplification device is in signal connection with the processing device, and the processing device is used for determining the current of the working line according to the amplification factor of the operational amplification device, the internal resistances of the current acquisition devices and the working voltage.
In one embodiment, the method further comprises the following steps:
the input end of the filtering device is in signal connection with the input end of the operational amplification device, and the output end of the filtering device is in signal connection with the processing device.
In one embodiment, the operational amplification device includes a plurality of operational amplification components, the number of the operational amplification components is the same as the number of the voltage acquisition components, one operational amplification component is in signal connection with one voltage acquisition component, and the plurality of operational amplification components are in signal connection with the processing device respectively.
In one embodiment, the method further comprises the following steps:
the input end of the analog-to-digital conversion equipment is in signal connection with the voltage acquisition equipment, and the output end of the analog-to-digital conversion equipment is in signal connection with the processing equipment.
A current sampling system, comprising:
the current sampling device as described above;
and the current collecting equipment is connected in series in the working circuit.
In one embodiment, the number of the working lines, the number of the current collecting devices and the number of the voltage collecting devices are all the same;
each working line is connected with one current collecting device in series, one voltage collecting device is connected with one current collecting device in parallel, and the current collecting devices and the voltage collecting devices are in signal connection with the processing device respectively.
A current sampling method applied to the current sampling system as described above, the current sampling method comprising:
obtaining internal resistances of a plurality of current collectors to obtain a plurality of internal resistances;
acquiring voltages at two ends of the current acquisition equipment to obtain a working voltage;
and determining the current of the working line according to the working voltage and the internal resistances.
In one embodiment, the determining the current of the working line according to the working voltage and the plurality of internal resistances comprises:
calculating the sum of the internal resistances to obtain the internal resistance sum;
and calculating the ratio of the working voltage to the internal resistance sum to obtain the current of the working circuit.
In one embodiment, the method further comprises the following steps:
obtaining voltages at two ends of the current collecting equipment for multiple times to obtain multiple initial voltages;
denoising the plurality of initial voltages according to a preset model to obtain a plurality of working voltages;
determining the sum of the internal resistances to obtain the internal resistance sum;
obtaining a plurality of working currents according to the sum of the plurality of working voltages and the internal resistance;
and calculating the average value of the plurality of working currents to obtain the current of the working line.
The embodiment of the application provides a current sampling device, includes: the current collection device comprises a plurality of current collectors which are sequentially connected in series, and the current collection device is connected in series in the working circuit. When the current in the working line is too small, the partial pressure of the current collecting equipment is increased through the internal resistances of the current collectors, then the working voltages at two ends of the current collecting equipment are detected through the voltage collecting equipment, and finally the current of the working line can be calculated only by calculating the ratio between the working voltage and the total internal resistances of the current collectors through the processing equipment. This application embodiment through be provided with a plurality of current collectors with voltage acquisition equipment, no matter how little the electric current in the working line, also can realize right the collection of electric current in the working line. The embodiment of the application provides current sampling device has solved the technical problem that exists can't carry out the sampling to the electric current in the light load working line among the prior art, has reached the technological effect that can make things convenient for the electric current in the effectual collection light load working line.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a current sampling apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a voltage acquisition device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a current sampling apparatus according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a partial structure of a current sampling apparatus according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a current sampling system according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a current sampling method according to an embodiment of the present application;
FIG. 7 is a schematic flow chart of a current sampling method according to an embodiment of the present application;
fig. 8 is a schematic flow chart of a current sampling method according to an embodiment of the present application.
Description of reference numerals:
10. a current sampling device; 100. a current collection device; 110. a current collector; 200. a voltage acquisition device; 210. a voltage acquisition component; 300. a processing device; 400. an operational amplification device; 410. an operational amplification component; 500. a filtering device; 600. an analog-to-digital conversion device; 20. a current sampling system; 21. and (4) working circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, a current sampling apparatus, a current sampling system and a current sampling method of the present application are further described in detail by embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The embodiment of the application provides a current sampling device 10, can be applied to and be used for gathering in arbitrary working circuit 21 current in the working circuit 21, working circuit 21 can be high voltage distribution network, low voltage distribution network, transformer substation or the arbitrary working circuit of user. The following embodiment specifically illustrates the application of the current sampling device 10 to the working line 21 of the low-voltage distribution network.
Referring to fig. 1, an embodiment of the present application provides a current sampling apparatus 10 for acquiring a current of a working line 21, where the current sampling apparatus 10 includes: a current collection device 100, a voltage collection device 200, and a processing device 300.
The current collecting device 100 is connected in series in the working line 21, the current collecting device 100 includes a plurality of current collectors 110, and the plurality of current collectors 110 are connected in series. The current collecting device 100 is connected in series in the working line 21, that is, the working line 21 is divided into two sections in the measuring process, for example, a first section and a second section, one end of the current collecting device 100 is electrically connected with the first end, the other end of the current collecting device 100 is electrically connected with the second end, the current collecting device 100 is connected in series between the first end and the second end, collects the current in the working line 21, and simultaneously provides a resistance for the working line 21, that is, the internal resistance of the current collecting device 100. When the current in the working line 21 is large, for example, the current is within the measurable range of the current collector 110, the current of the working line 21 can be directly obtained by the current collecting device 100. However, when the load in the working line 21 is too light, the current in the working line 21 is too small and is much smaller than the measurable range of the current collector 110, the current collector 110 cannot collect the current in the working line 21, and an accurate current measurement value cannot be obtained. However, if the current collectors 110 have internal resistances, a voltage must exist on each current collector 110, and if only one current collector 110 exists on the working line 21, the divided voltage on one current collector 110 is equal to the product of the internal resistance of the current collector 110 and the current on the working line 21, and the value is small and is likely to be much smaller than the minimum processable voltage of a subsequent processing device. In this embodiment, the number of the current collectors 110 is multiple, and the total voltage division of the current collectors 110 is multiple times of the voltage division of each current collector 110, so that the number of the current collectors 110, that is, the working voltage of the current collecting device 100, is greatly increased. The current collector 110 in this embodiment may be an ammeter, a current sensor, a resistor, or the like, and this embodiment is not limited specifically, and only needs to implement a function of increasing the voltage division of the current collecting device 100.
The voltage collecting device 200 is connected in parallel with the current collecting device 100, and is configured to collect the working voltage at two ends of the current collecting device 100, that is, to collect the voltage division of the devices in the working circuit 21. The voltage collecting device 200 may be one or a plurality of voltage collecting devices 200, and when the voltage collecting device 200 is a plurality of voltage collecting devices 200, the plurality of voltage collecting devices 200 may be connected in parallel to each individual current collector 110, or may be connected in parallel to a plurality of adjacent current collectors 110, and the voltages at the two ends of the current collecting device may be obtained by adding a plurality of voltage values. The voltage acquisition device 200 may be a voltmeter, a voltage transformer, or a single chip loaded with an ADC module, and the single chip loaded with the ADC module has a function of detecting voltage within a certain range. In this embodiment, the voltage collecting device 200 is not specifically limited, and may be specifically selected according to actual conditions, and only the function of measuring the voltages at the two ends of the voltage collecting device 200 may be required to be satisfied.
The processing device 300 is in signal connection with the voltage collecting device 200, and the processing device 300 is configured to determine the current of the working line 21 according to the internal resistances of the plurality of current collectors 110 and the working voltage. The processing device 300 and the voltage collecting device 200 may be connected wirelessly or by wire, and this embodiment is not limited specifically. After the current collectors 110 determine, the internal resistances of the current collectors 110 or the total internal resistance data of the current collectors 110 may be stored in the processing device 300 in advance, and after the voltage collecting device 200 transmits the collected working voltages at the two ends of the current collecting device 100 to the processing device 300, the processing device 300 may obtain the current of the working line 21 by calculating the ratio of the working voltages to the total internal resistances of the current collectors 110, so as to achieve the purpose of collecting the current of the working line 21. The processing device 300 may be a computer, a server, a PLC chip, a single chip, or the like. It should be noted that, when the voltage collecting device 200 is a single chip microcomputer loaded with an ADC module, the ADC module may be loaded into the server, a PLC chip, a single chip microcomputer or other chips with simple data processing functions, and a processing device is utilized to simultaneously perform two functions of detecting the voltage at two ends of the current collecting device 100 and determining the current of the working line 21 according to the internal resistances of the plurality of current collectors 110 and the working voltage. In this embodiment, the processing device 300 is not limited at all, and may be specifically selected according to actual situations, and only needs to satisfy the function of determining the current of the working line 21 according to the internal resistances of the plurality of current collectors 110 and the working voltage.
The working principle of the current sampling device 10 provided by the embodiment is as follows:
the embodiment of the application provides current sampling device 10 includes current collection equipment 100, voltage collection equipment 200 and processing apparatus 300, current collection equipment 100 concatenates in working line 21, current collection equipment 100 includes a plurality of that establish ties in proper order current collector 110. When the current in the working line 21 is large, the current collecting apparatus 100 can directly collect the current in the working line 21. When the current in the working line 21 is too small due to the reason that the load is too light, etc., the plurality of current collectors 110 have internal resistance, and each current collector 110 has a divided voltage. The voltage collecting device 200 is connected in parallel with the current collecting device 100, and the voltage collecting device 200 can collect the voltage across the current collecting device 100, that is, the total voltage of the plurality of current collectors 110. The working voltage at the two ends of the current collection device 100 collected by the voltage collection device 200, the processing device 300 is in signal connection with the voltage collection device 200, and the current of the working circuit 21 can be obtained by calculating the ratio between the working voltage and the total internal resistance of the plurality of current collectors 110.
The embodiment of the present application provides a current sampling device 10, including: current collection equipment 100, voltage collection equipment 200 and processing apparatus 300, current collection equipment 100 includes a plurality of that a plurality of series connection in proper order current collector 110, current collection equipment 100 concatenates in working line 21. When the current in the working line 21 is too small, the divided voltage of the current collection device 100 is increased through the internal resistances of the current collectors 110, then the working voltages at the two ends of the current collection device 100 are detected through the voltage collection device 200, and finally the current of the working line 21 can be calculated only by calculating the ratio between the working voltage and the total internal resistances of the current collectors 110 through the processing device 300. By arranging the plurality of current collectors 110 and the voltage collecting device 200, the current in the working line 21 can be collected, and the current in the working line 21 can be collected. The embodiment of the application provides current sampling device 10 is provided with a plurality of that establish ties in proper order current collector 110 can gather simultaneously heavy current in the working line 21 also can gather the undercurrent, and the acquisition scope is wider, and adaptability is wider. The embodiment of the application provides current sampling device 10 has solved the technical problem that exists among the prior art can't carry out the sampling to the electric current in light load working line 21, has reached the technological effect that can make things convenient for the electric current in effectual collection light load working line 21.
Referring to fig. 2, in an embodiment, the voltage collecting device 200 includes a plurality of voltage collecting components 210, the number of the voltage collecting components 210 is the same as that of the current collectors 110, one voltage collecting component 210 is connected in parallel with one current collector 110, and the voltage collecting components 210 are respectively in signal connection with the processing device 300, so as to adjust the number of the voltage collecting components 210 according to actual conditions such as a voltage collecting range, and adapt to different collecting ranges. That is, one voltage collecting component 210 collects voltages at two ends of one current collector 110 to obtain a plurality of initial voltages, and the processing device 300 calculates the sum of the voltages of the plurality of initial voltages to obtain the working voltage at two ends of the current collecting device 100. Meanwhile, the voltage collecting device 200 may include a plurality of voltage collecting components 210, the number of the voltage collecting components 210 is less than the number of the current collectors 220, one voltage collecting component 210 is connected in parallel with M adjacent current collectors 110, where M is a positive integer not less than 1; the voltage acquisition components 210 are respectively in signal connection with the processing device 300.
The voltage acquisition component 210 may be a voltmeter, a voltage transformer, or a single chip with an ADC module. It should be noted that, when the voltage acquisition component 210 is a single chip microcomputer loaded with an ADC module, etc., the ADC module may be loaded on the single chip microcomputer or a chip or a server thereof with a processing function, so as to simultaneously implement the functions of the voltage acquisition component 210 and the processing device 300. The voltage acquisition component 210 is not limited in this embodiment, and may be specifically selected according to actual conditions, and only needs to satisfy the function of measuring the voltage at the two ends of the voltage acquisition device 200.
Referring to fig. 3, in an embodiment, the current sampling apparatus 10 further includes: operational amplification apparatus 400, filtering apparatus 500 and analog-to-digital conversion apparatus 600.
The input end of the operational amplification device 400 is in signal connection with the plurality of voltage acquisition components 210, the output end of the operational amplification device 400 is in signal connection with the processing device 300, and the processing device 300 is configured to determine the current of the working line 21 according to the amplification factor of the operational amplification device 400, the internal resistance of the plurality of current acquisition devices 110, and the working voltage. The operational amplifier device 400 may be an operational amplifier, an operational amplifier circuit, or the like, and the operational amplifier device 400 is configured to amplify the voltage signals at two ends of the current collecting device 100, so as to facilitate processing of the voltage signals by subsequent devices. The operational amplifier device 400 has a fixed amplification factor, and the processing device 300 is connected to the output end of the operational amplifier device 400, so that the voltage signal received by the processing device 300 is necessarily the voltage signal amplified by the operational amplifier. Therefore, the processing device 300 needs to divide by the amplification factor of the operation amplification device 400 when performing the current calculation. Referring to fig. 4, in an embodiment, the operational amplifier device 400 includes a plurality of operational amplifier devices 410, the number of the operational amplifier devices 410 is the same as the number of the voltage acquisition devices 210, one operational amplifier device 410 is in signal connection with one voltage acquisition device 210, and the plurality of operational amplifier devices 410 are in signal connection with the processing device 300 respectively. When the number of the operational amplification components 410 is plural, the number of the operational amplification components 410 can be conveniently adjusted according to actual situations such as the number of the current collectors 110 connected in series in the working line 21, so as to improve the measurement flexibility of the current collecting device 100.
The input end of the filtering device 500 is in signal connection with the input end of the operational amplifier device 400, the output end of the filtering device 500 is in signal connection with the processing device 300, and the working line 21 and the voltage acquisition device 200 can generate various different signals when acquiring the voltages at the two ends of the current acquisition device 100. Or when the current in the working line 21 is greater than a certain value, the current in the working line 21 can be directly obtained through the current collector 110, so that the subsequent voltage collecting device 200 and the like are not required to perform signal conversion and processing. Therefore, a voltage acquisition range can be preset, and the filtering device 500 filters the voltage or other signals in the working line 21 which exceed the preset range in advance, and only the voltage within the preset range is reserved, so that the data calculation amount of the processing device 300 and the calculation amount of data analysis processing are reduced. The filtering device 500 may be any one of a filter and a filtering circuit, and the type of the filtering device 500 and the filtering band and the like are not specifically limited in this embodiment and may be specifically selected according to actual situations.
The input end of the analog-to-digital conversion device 600 is in signal connection with the voltage acquisition device 200, the output end of the analog-to-digital conversion device 600 is in signal connection with the processing device 300, once the working line 21 is started to work, the voltage at two ends of the voltage acquisition device 200 is a stable analog signal, and the analog-to-digital conversion device 600 is used for converting the analog signal of the voltage at two ends of the current acquisition device 100 acquired by the voltage acquisition device 200 into a digital signal which is easy to process and analyze. The analog-to-digital conversion device 600 may be an analog-to-digital converter, an analog-to-digital conversion circuit, or the like, and this embodiment is not limited at all, and may be specifically selected according to actual situations, and only needs to satisfy the function of converting an analog signal into a digital signal.
Referring to fig. 5, an embodiment of the present application provides a current sampling system 20, including: current sampling means 10 and a working line 21.
The beneficial effects of the current sampling apparatus 10 have been described in detail in the above embodiments, and are not described in detail herein.
The working line 21 may be a working line 21 in any power distribution system or local area network, and only the current collecting device 100 needs to be connected in series in the working line 21 for immediate use.
In one embodiment, the number of the working lines 21, the number of the current collecting devices 100, and the number of the voltage collecting devices 200 are all multiple, and the number of the working lines 21, the number of the current collecting devices 100, and the number of the voltage collecting devices 200 are all the same. Each working line 21 is connected in series with one current collection device 100, one voltage collection device 200 is connected in parallel with one current collection device 100, and a plurality of current collection devices 100 and a plurality of voltage collection devices 200 are respectively connected with the processing device 300 through signals. For example, the number of the working lines 21 is three, and the working lines are a phase, a phase b phase and a phase c phase in the same line, each phase of the working line may be provided with one current sampling device 10, or each phase of the working line 21 may be provided with a plurality of the current collectors 110 and a plurality of the voltage collecting devices 200, and the voltage collecting devices 200 of each phase are in signal connection with the processing device 300, that is, the phase a, the phase b and the phase c share one processing device 300, so that the maximization of resource utilization is realized, and the cost of the processing device 300 is reduced.
Referring to fig. 6, an embodiment of the present application provides a current sampling method applied to the current sampling system 20 as described above, where the current sampling method includes the following steps:
s100, obtaining internal resistances of the current collectors to obtain a plurality of internal resistances.
The plurality of current collectors 110 are connected in series and are all connected in the working line 21 in series, the internal resistances of the plurality of current collectors 110 may be the same or different, but it should be noted that the internal resistance of the current collector 110 is a fixed value, and the internal resistances of the plurality of current collectors 110 also have a plurality of internal resistance values. The internal resistance may be obtained by a resistance measuring instrument, may also be obtained by measurement of a common measuring circuit, and may also be directly obtained by factory parameters of the current collector 110, and the like.
And S200, obtaining the voltage at two ends of the current collecting equipment to obtain the working voltage.
The working voltage refers to voltages at two ends of the current collecting device 100, that is, voltages at two ends of the plurality of current collectors 110, the working voltage may be obtained through the voltage collecting device 200, and the voltage collecting device 200 may be a voltmeter, a voltage transformer, or a single chip microcomputer with an ADC module. The voltage collecting apparatus 200 may include a plurality of voltage collecting components 210, the number of the voltage collecting components 210 is the same as that of the current collectors 110, and one voltage collecting component 210 is connected in parallel to one current collector 110. The step S200 may include steps S210 and S220. And S210, obtaining the voltage at two ends of each current collector 110 to obtain a plurality of first voltages. The first voltage refers to a voltage across each of the current collectors 110. And S220, calculating the sum of the plurality of first voltages to obtain the working voltage.
And S300, determining the current of the working line according to the working voltage and the internal resistances.
The processing device 300 obtains the working voltage and the internal resistances, and according to a formula: the current of the working line 21 can be calculated by voltage/resistance, so as to achieve the purpose of collecting the current of the working line 21. Wherein the current refers to the current of the working line 21, the voltage refers to the working voltage across the current collecting device 100, and the resistance refers to the sum of the internal resistances.
Referring to fig. 7, in one embodiment, step S300 includes:
and S310, calculating the sum of the internal resistances to obtain the internal resistance sum.
The internal resistance refers to the internal resistance of the current collector 110, and the sum of the internal resistances of the plurality of current collectors 110 connected in series in sequence, and the processing device 300 may obtain the sum of the internal resistances only by adding the internal resistances of the plurality of current collectors 110.
And S320, calculating the ratio of the working voltage to the sum of the internal resistances to obtain the current of the working line.
The calculation formula of the current is as follows: the current refers to the current of the working line 21, the voltage refers to the working voltage across the current collection device 100, and the resistance refers to the sum of the internal resistances of the plurality of current collectors 110, that is, the sum of the internal resistances. Even if the current in the working line 21 cannot reach the measurement threshold of the current collector 110, the current of the working line 21 can be determined only by the calculation formula of the current by acquiring the internal resistances of the current collectors 110 and the working voltages at the two ends of the current collecting device 100, so that the problem of limitation of the collection threshold of the current collector 110 is avoided.
Referring to fig. 8, in an embodiment, the current sampling method may perform multiple times of collection on the voltage across the current collection device 100 to improve the accuracy of the current of the working line 21, and the current sampling method includes:
and S400, obtaining the voltages at the two ends of the current collecting equipment for multiple times to obtain multiple initial voltages.
The initial voltage refers to the voltage across the current collecting device 100, and the method for collecting the voltage across the current collecting device 100 each time is the same as the method for acquiring the voltage across the current collecting device 100 in step S200, and is not described herein again.
S500, denoising the plurality of initial voltages according to a preset model to obtain a plurality of working voltages.
The denoising is to perform preliminary processing on the voltages at the two ends of the current collecting device 100, for example, to determine whether each initial voltage exceeds the range of the voltage collecting device 200 or the operational amplifier device 400, and if the initial voltage exceeds the range, the initial voltage exceeding the range is rejected, so as to avoid the problem that the current of the working line 21 cannot be obtained because part of the initial voltage exceeds the range, thereby improving the accuracy of the working voltage.
S600, determining the sum of the internal resistances to obtain the internal resistance sum.
The internal resistance refers to the internal resistance of the current collector 110, and the sum of the internal resistances of the plurality of current collectors 110 connected in series in sequence, and the processing device 300 may obtain the sum of the internal resistances only by adding the internal resistances of the plurality of current collectors 110.
And S700, obtaining a plurality of working currents according to the sum of the working voltages and the internal resistances.
The calculation formula of the current is as follows: the current refers to the current of the working line 21, the voltage refers to the working voltage across the current collection device 100, and the resistance refers to the sum of the internal resistances of the plurality of current collectors 110, that is, the sum of the internal resistances. The internal resistance sums are fixed, the working voltages comprise a plurality of working voltages, and the ratio of each working voltage to the internal resistance sum is calculated respectively to obtain the working currents.
And S800, calculating the average value of the plurality of working currents to obtain the current of the working line.
In the working currents obtained in step S700, the processing device 300 may obtain the current of the working line 21 by averaging the working currents, that is, obtain the current of the working line 21 with higher accuracy by averaging the working currents after performing the average filtering, so as to improve the accuracy of the current sampling method provided in this embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A current sampling device for sampling current of a working line, the current sampling device comprising:
the current collecting device is connected in the working circuit in series and comprises a plurality of current collectors which are connected in series;
the voltage acquisition equipment is connected with the current acquisition equipment in parallel and is used for acquiring working voltages at two ends of the current acquisition equipment;
and the processing equipment is in signal connection with the voltage acquisition equipment and is used for determining the current of the working line according to the internal resistances of the plurality of current collectors and the working voltage.
2. The current sampling device of claim 1, wherein the voltage acquisition apparatus comprises a plurality of voltage acquisition components, the number of voltage acquisition components is the same as the number of current collectors, and one voltage acquisition component is connected in parallel with one current collector; and the voltage acquisition assemblies are respectively in signal connection with the processing equipment.
3. The current sampling device according to claim 1, wherein the voltage collecting apparatus comprises a plurality of voltage collecting components, the number of the voltage collecting components is smaller than the number of the current collectors, one voltage collecting component is connected in parallel with M adjacent current collectors, where M is a positive integer not less than 1; and the voltage acquisition assemblies are respectively in signal connection with the processing equipment.
4. The current sampling device of claim 2, further comprising:
the input end of the operational amplification device is in signal connection with the voltage acquisition assemblies respectively, the output end of the operational amplification device is in signal connection with the processing device, and the processing device is used for determining the current of the working line according to the amplification factor of the operational amplification device, the internal resistances of the current acquisition devices and the working voltage.
5. The current sampling device of claim 4, further comprising:
the input end of the filtering device is in signal connection with the input end of the operational amplification device, and the output end of the filtering device is in signal connection with the processing device.
6. The current sampling device of claim 4,
the operational amplification equipment comprises a plurality of operational amplification components, the number of the operational amplification components is the same as that of the voltage acquisition components, one operational amplification component is in signal connection with one voltage acquisition component, and the plurality of operational amplification components are in signal connection with the processing equipment respectively.
7. The current sampling device of claim 1, further comprising:
the input end of the analog-to-digital conversion equipment is in signal connection with the voltage acquisition equipment, and the output end of the analog-to-digital conversion equipment is in signal connection with the processing equipment.
8. A current sampling system, comprising:
the current sampling device of any one of claims 1-7;
and the current collecting equipment is connected in series in the working circuit.
9. The current sampling system according to claim 8, wherein the number of the working lines, the number of the current collecting devices and the number of the voltage collecting devices are all the same;
each working line is connected with one current collecting device in series, one voltage collecting device is connected with one current collecting device in parallel, and the current collecting devices and the voltage collecting devices are in signal connection with the processing device respectively.
10. A current sampling method applied to the current sampling system according to any one of claims 8 to 9, the current sampling method comprising:
obtaining internal resistances of a plurality of current collectors to obtain a plurality of internal resistances;
acquiring voltages at two ends of the current acquisition equipment to obtain a working voltage;
and determining the current of the working line according to the working voltage and the internal resistances.
11. The current sampling method of claim 10, wherein said determining the current of the working line from the working voltage and the plurality of internal resistances comprises:
calculating the sum of the internal resistances to obtain the internal resistance sum;
and calculating the ratio of the working voltage to the internal resistance sum to obtain the current of the working circuit.
12. The current sampling method of claim 10, further comprising:
obtaining voltages at two ends of the current collecting equipment for multiple times to obtain multiple initial voltages;
denoising the plurality of initial voltages according to a preset model to obtain a plurality of working voltages;
determining the sum of the internal resistances to obtain the internal resistance sum;
obtaining a plurality of working currents according to the sum of the plurality of working voltages and the internal resistance;
and calculating the average value of the plurality of working currents to obtain the current of the working line.
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