Current sensor and current measuring system
By storing identification and correction parameters in the current sensor, free pairing and precise calibration of the current measuring unit and the instrument body are achieved, solving the problems of complexity and high hardware cost of the current sensor pairing, and improving accuracy and flexibility.
Patent Information
- Application Number
- CN202420872776.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-24
AI Technical Summary
When the number of existing current sensors increases, the pairing and calibration complexity increases, resulting in problems such as under-meeting accuracy and high hardware costs.
By storing identification and correction parameters in the connection part of the current sensor or the instrument body, the current measuring part and the instrument body can be freely paired and accurately calibrated, simplifying the use process, and integrating the integrator and signal conditioning part into the instrument body to avoid As the number of current measuring units increases, the demand for corresponding circuits is increased.
It realizes intelligent pairing and precise calibration of current sensors, reduces operational difficulty and hardware costs, improves measurement accuracy and flexibility, and adapts to a variety of application scenarios.
Smart Images
Figure CN222280726U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of signal measurement, and in particular to a current sensor and a current measurement system. Background Art
[0002] The traditional Rogowski coil current sensor consists of a Rogowski coil, a closed connection part, an integrator and a signal conditioning part, and an instrument body.
[0003] In the prior art, the Rogowski coil and the closed connection part are usually combined into one piece; the integrator and the signal conditioning part are either independent, integrated into the closed connection part, or integrated into the instrument body; each part is connected by a soft signal line of a certain length. The paired use of the Rogowski coil, the integrator and the signal conditioning part often requires strict comprehensive calibration before leaving the factory to ensure the overall accuracy.
[0004] However, with the increase in the specifications, types and number of Rogowski coils equipped inside the equipment, the complexity of this pairing and calibration also increases accordingly. The existing problems mainly include: when the integrator and signal conditioning unit exist independently or are integrated into the instrument body, the Rogowski coil and the closed connection part need to be paired with other parts when used, which is a one-to-one relationship. When multiple sets of Rogowski coils and closed connection parts exist at the same time, they cannot be used in combination with other parts at will, otherwise the accuracy will not reach the level after calibration; when the integrator and signal conditioning unit are integrated into the closed connection part, the integrator and signal conditioning unit and the Rogowski coil also become one. At this time, the integrated component and the instrument body may be able to be combined arbitrarily, but the cost is that the number of integrators and signal conditioning units is consistent with the number of Rogowski coils. When there are multiple sets of Rogowski coils, there must also be multiple sets of integrators and signal conditioning parts, which makes the hardware cost very high. Utility Model Content
[0005] In view of the above-mentioned problems existing in the prior art, the present application provides a current sensor, in which a connecting part or an instrument body of the current sensor stores the identification of the instrument body or connecting part paired with it and the corresponding correction parameters between the connecting part and the instrument body. In this way, when a connecting part is used in pair with an instrument body, the electrical signal sensed by the current measuring part can be corrected according to the corresponding correction parameters, and the current measuring part and the instrument body can be freely paired and accurately calibrated, which greatly simplifies the use process of the current sensor.
[0006] According to a first aspect of the present application, there is provided a current sensor, characterized in that it comprises:
[0007] One or more current measuring parts, used for sensing the current signal in the measured wire;
[0008] One or more connecting parts, which are connected to the one or more current measuring parts in a one-to-one correspondence, and any one of the one or more connecting parts includes a signal acquisition unit and a memory, wherein the signal acquisition unit is used to collect the electrical signal induced by the current measuring part and transmit the collected electrical signal, and the memory is used to store the identification of the connecting part;
[0009] One or more instrument bodies, each of which is connected to one of the one or more connecting parts, for receiving an electrical signal transmitted by the connecting part and converting the electrical signal into a digital signal, and correcting the digital signal according to a correction parameter corresponding to an identification of the connecting part connected to the instrument body and / or an identification of the instrument body.
[0010] According to a second aspect of the present application, a current measurement system is provided, characterized in that it includes:
[0011] The current sensor according to the first aspect; and
[0012] External hosts, including:
[0013] a second transmission module, configured to receive the corrected digital signal from the current sensor; and
[0014] An electric parameter calculation unit is connected to the second transmission module and is used to perform electric parameter calculation according to the corrected digital signal.
[0015] According to the current sensor and current measurement system provided by the present application, by storing the identification of the instrument body or the connection part matched with it and the corresponding correction parameters between the connection part and the instrument body in the connection part or the instrument body of the current sensor, more than one instrument body and more than one connection part of the current sensor can be freely paired, and the corresponding correction parameters after pairing are used to correct the electrical signal induced by the current measurement part, so that the intelligent pairing and accurate calibration of the current measurement part and the instrument body can be realized, the use process of the current sensor can be simplified, the operation difficulty is reduced, and the overall accuracy is improved. In addition, since the functions of the integrator and the signal conditioning part are integrated in the instrument body, the circuit corresponding to the integrator and the signal conditioning part will not be increased as the number of current measurement parts increases, and the memory for storing the identification of the instrument body, the identification of the connection part and the correction parameters is low in cost and small in size, so as not to increase the overall hardware cost of the current sensor. In addition, the current sensor is flexible in design, can work independently to meet the basic current measurement requirements, and can cooperate with external devices wirelessly or wired to build a measurement system. This diversified design method enables the current sensor to adapt to various application scenarios and provide users with flexible and efficient solutions. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present application.
[0017] Figure 1 is a schematic diagram of a current sensor according to an embodiment of the present application.
[0018] Figure 2 It is a schematic diagram of the circuit structure of the instrument body according to one embodiment of the present application.
[0019] Figure 3 It is a schematic diagram of the circuit structure of the instrument body according to another embodiment of the present application.
[0020] Figure 4 It is a schematic diagram of the circuit structure of the instrument body according to another embodiment of the present application.
[0021] Figure 5 is a schematic diagram of a current measurement system according to an embodiment of the present application.
[0022] Figure 6 is a flow chart of a method for measuring current according to an embodiment of the present application.
[0023] Figure 7 is a flow chart of a method for calibrating a current sensor according to an embodiment of the present application. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0025] Figure 1 FIG. 1 is a schematic diagram of a current sensor according to an embodiment of the present application. Figure 1 As shown in FIG. 1 , the current sensor includes a current measuring part, a connecting part and an instrument body. Figure 1 The number of current measuring parts, connecting parts and instrument bodies shown in the figure is one. In fact, in a set of current sensors, the number of current measuring parts, connecting parts and instrument bodies can be multiple, wherein the current measuring parts and connecting parts are connected one-to-one, that is, the number of current measuring parts and connecting parts is the same.
[0026] According to one embodiment, the current measuring unit is used to sense the current signal in the conductor under test, sense the change of the current signal in the conductor, and thus obtain the electrical signal. The current measuring unit is used to measure the current signal in the conductor under test, and adapt to different application scenarios and measurement requirements. For example, the current measuring unit can not only measure AC current and DC current, but also has the ability to accurately measure high-frequency current signals and tiny currents in AC current. When measuring AC signals or high-frequency currents, the current measuring part can use a Rogowski coil, which is directly put on the conductor under test to capture the current signal. When the AC current flowing through the conductor generates an alternating magnetic field around the conductor, the magnetic field will induce an AC voltage signal in the coil that changes proportionally to the rate of change of the current.
[0027] exist Figure 1 In the embodiment, the connection part includes a signal acquisition unit and a memory, wherein the signal acquisition unit is used to acquire the electrical signal induced by the current measuring part and transmit the acquired electrical signal, and the memory is used to store the identification of the connection part. According to one embodiment, the memory may be an ID chip. The ID chip has a unique identification code, which can identify the identification information of the connection part or the current measuring part, and transmit it to the instrument body so that the instrument body can identify and manage it. According to one embodiment, the signal acquisition unit includes a plurality of test lines and may also include related components, which acquire the electrical signal induced in the current measuring part and transmit the electrical signal to the instrument body as a transmission medium.
[0028] Each instrument body is connected to one of the more than one connecting parts, and is used to receive the electrical signal transmitted by the connecting part and convert the electrical signal into a digital signal, and correct the digital signal according to the correction parameter corresponding to the identification of the connecting part connected to the instrument body and / or the identification of the instrument body. According to one embodiment, an electrical connection is adopted between the connecting part and the instrument body, which can be a soft signal line connection or a hard connection (such as a plug and a socket, a probe and a contact, a probe and a probe hole). Among them, after obtaining the correction parameter, the instrument body can use various means existing in the prior art to correct the digital signal.
[0029] In order to obtain the correction parameters corresponding to different connection parts and different instrument bodies, it is necessary to pair more than one connection part of the current sensor with more than one instrument body, and then calibrate to obtain the correction parameters corresponding to each pairing. The calibration process will be described in detail below. After the calibration is completed, the correction parameters can be written into the memory of the connection part involved in the calibration. When used, the instrument body reads its own identification (such as the device number) and the information stored in the memory for matching; or the correction parameters are written into the instrument body involved in the calibration. When used, the instrument body reads the identification of the connection part (such as the product number) and matches the information stored in itself.
[0030] According to some embodiments, in addition to storing its own identification, the memory of the connection part is also used to store the identification of more than one instrument body paired with the connection part and the correction parameters corresponding to the more than one instrument body paired with the connection part. In this way, the instrument body determines the corresponding correction parameters in the memory through its own identification, and corrects the digital signal according to the correction parameters. The correction parameters are stored in the memory of the connection part. When the instrument body reads the identification of the connection part (such as the product number), it also reads the correction parameter information, directly corrects the calculation, and saves the process of the instrument body looking for the correction parameter information.
[0031] According to other embodiments, the instrument body may also store the identification of one or more connection parts paired and calibrated with the instrument body and correction parameters corresponding to the one or more connection parts paired and calibrated with the instrument body, determine the corresponding correction parameters by reading the identification of the connection part currently connected to it, and correct the digital signal according to the correction parameters.
[0032] According to one embodiment, the current sensor may include 9 current measuring parts, 9 connecting parts and 3 instrument bodies, and the 9 current measuring parts and the 9 connecting parts are connected one by one, combined into one, and then connected to the 3 instrument bodies respectively. According to actual needs, each of the 3 instrument bodies can be connected to any one of the 9 current measuring part-connecting part combinations, or each of the 9 current measuring part-connecting part combinations can be connected to any one of the 3 instrument bodies. In the scheme of the present application, since the connection of any current measuring part-connecting part combination with any instrument body is calibrated, the correction parameters of each connection mode are recorded. After receiving the electrical signal transmitted by the connecting part, the instrument body can correct the electrical signal according to the correction parameters corresponding to the currently connected connecting part. Therefore, in the present application, the connecting part of the current sensor can be freely combined with the instrument body, and the measurement accuracy can reach the calibration level.
[0033] Next, according to Figures 2 to 4 , the structure of the instrument body is introduced. Figure 2 Schematic diagram of the circuit structure of the instrument body according to one embodiment of the present application. Figure 2 As shown, the instrument body includes an integration circuit module, a first analog-to-digital conversion module and a calculation module, wherein the first analog-to-digital conversion module is connected to the integration circuit module, and the calculation module is connected to the first analog-to-digital conversion module.
[0034] The integration circuit module is used to integrate the electrical signal from the signal acquisition unit to obtain the integrated signal, wherein the electrical signal may be an AC induced voltage signal, which is restored to an analog signal proportional to the current signal after integration; the first analog-to-digital conversion module is used to convert the integrated signal into a digital signal; the calculation module is used to correct the digital signal according to the correction parameter corresponding to the identification of the connection part connected to the instrument body and / or the identification of the instrument body. The calculation module accurately corrects the digital signal, eliminates the error in the signal, and ensures the accuracy and reliability of the data.
[0035] Figure 3 is a schematic diagram of the circuit structure of the instrument body according to another embodiment of the present application. Figure 2 compared to, Figure 3 The instrument body shown includes not only an integration circuit module, a first analog-to-digital conversion module and a calculation module, but also an amplification circuit module and a signal conditioning module. Figure 3 In the illustrated embodiment, the amplifying circuit module, the integrating circuit module, the signal conditioning module, the first analog-to-digital conversion module and the computing module are connected in sequence.
[0036] Among them, the amplification circuit module is used to amplify the electrical signal from the signal acquisition unit; the integration circuit module is used to integrate the amplified electrical signal to obtain the integrated signal; the signal conditioning module is used to collect the analog signal output by the integration circuit module and perform signal conditioning, including amplification, filtering and other operations to ensure signal quality; the first analog-to-digital conversion module is used to convert the signal after signal conditioning into a digital signal; the calculation module is used to correct the digital signal according to the correction parameters corresponding to the identification of the connection part connected to the instrument body and / or the identification of the instrument body.
[0037] It should be noted that the instrument body may include one of an amplifying circuit module and a signal conditioning module, or may include both. That is, in addition to the integration circuit module, the first analog-to-digital conversion module and the calculation module, the instrument body may also include an amplifying circuit module and / or a signal conditioning module. In the present application, an electrical signal processing device is set, which includes an integration circuit module and an amplifying circuit module, or an integration circuit module and a signal conditioning module, or an integration circuit module, an amplifying circuit module and a signal conditioning module. In the case where the electrical signal processing device includes an amplifying circuit module and an integration circuit module, the connection order of the amplifying circuit module and the integration circuit module can be arbitrary, and the amplifying circuit module can be in front, or the integration circuit module can be in front; in the case where the electrical signal processing device includes a signal conditioning module and an integration circuit module, the connection order of the signal conditioning module and the integration circuit module can be arbitrary, and the signal conditioning module can be in front, or the integration circuit module can be in front. In addition, the number of the amplifying circuit module and the signal conditioning module can be one or more, respectively, and the present application does not impose any restrictions on this.
[0038] The connection relationship between the integration circuit module, the amplification circuit module and the signal conditioning module is not limited to Figure 3 The connection order shown in the figure can be connected in any order, for example, the connection order can be the amplifier circuit module, the signal conditioning module and the integration circuit module, the connection order can be the signal conditioning module, the integration circuit module and the amplifier circuit module, and so on.
[0039] Figure 4 Schematic diagram of the circuit structure of the instrument body according to another embodiment of the present application. Figure 3 compared to, Figure 4 The instrument body shown also includes a first transmission module and / or a first synchronization module. The first transmission module is connected to the calculation module and is used to send the corrected digital signal; the first synchronization module is connected to the first analog-to-digital conversion module and is used to ensure that the sampling time of the first analog-to-digital conversion module is synchronized with the external host.
[0040] According to one embodiment, the first transmission module and the first synchronization module may have a wireless transmission function and a wireless synchronization function. According to another embodiment, the first transmission module and the first synchronization module may have a wired transmission function and a wired synchronization function. The first analog-to-digital conversion module receives a time signal from the first synchronization module, and the first synchronization module ensures that the signal sampling time of the electrical signal is synchronized with the external host. The calculation module sends the corrected digital signal to the external host through the first transmission module.
[0041] The calculation module may not correct the digital signal, and the correction process of the digital signal is completed by the external host.
[0042] Figure 5 FIG. 1 is a schematic diagram of a current measurement system according to an embodiment of the present application. Figure 5 As shown, the system includes a current sensor and an external host, wherein the structure of the current sensor can refer to Figure 1 The circuit structure shown is not described in detail. The external host may include a second transmission module and an electric parameter calculation unit, wherein the second transmission module is used to receive the corrected digital signal from the current sensor; the electric parameter calculation unit is connected to the second transmission module and is used to perform electric parameter calculation according to the corrected digital signal, such as outputting a current measurement value representing the current flowing through the measured conductor.
[0043] exist Figure 5 In the shown embodiment, the external host may further include: a second analog-to-digital conversion module and / or a second synchronization module, wherein the second analog-to-digital conversion module is used to convert the received analog voltage signal into a digital voltage signal; the second synchronization module is connected to the second analog-to-digital conversion module to ensure that the sampling time of the voltage signal is synchronized with the current sensor.
[0044] According to one embodiment, the second transmission module and the second synchronization module may have a wireless transmission function and a wireless synchronization function. According to another embodiment, the second transmission module and the second synchronization module may have a wired transmission function and a wired synchronization function.
[0045] Based on the above description, according to one aspect of the present application, a method for measuring current using a current sensor is provided. Figure 6 is a flow chart of a method for measuring current according to an embodiment of the present application, comprising the following steps:
[0046] Step S601, sensing a current signal in the measured conductor by any current measuring unit among the one or more current measuring units;
[0047] Step S602, collecting the sensed electrical signal through a connection part connected to the current measuring part for sensing the current signal, transmitting the collected electrical signal, and storing an identifier of the connection part in a memory of the connection part; and
[0048] Step S603, receiving the electrical signal collected by the connecting part through the instrument body connected to the connecting part, and correcting the digital signal according to the correction parameter corresponding to the identification of the connecting part and / or the identification of the instrument body.
[0049] According to some embodiments, a set of current sensors includes N connecting parts and M instrument bodies (N≥1, M≥1), the connecting parts and the current measuring part are combined into one, and any instrument body may be used in combination with the N connecting parts. The connecting parts are product-numbered when leaving the factory, for example, they may be X1-X N The identification of the connection part (such as the product number) is written into the memory of the connection part. The instrument body is numbered when it leaves the factory, for example, it can be Y1-Y M , and write the device number into the instrument body to ensure that the numbers of the connection part and the instrument body are unique.
[0050] When in use, the current measuring part senses the current signal in the measured conductor and transmits the electrical signal to the connecting part. The connecting part collects the sensed electrical signal and transmits the collected electrical signal. The instrument body receives the electrical signal collected by the connecting part and corrects the digital signal according to the correction parameters corresponding to the identification of the connecting part and / or the identification of the instrument body.
[0051] According to one embodiment, the instrument body is connected to the connection part through a communication interface, and reads the product number stored in the memory of the connection part. For example, if the product number is X3, the calculation module inside the instrument body searches for the correction parameters corresponding to the product number X3 to perform correction calculations and obtain the measurement results; or, the instrument body reads its own device number. For example, if the device number is Y5, the instrument body calls the correction parameters corresponding to the device number Y5 in the memory to perform correction calculations and obtain the measurement results; or, the instrument body reads its own device number. For example, if the device number is Y5, the instrument body calls the correction parameters corresponding to the device number Y5 in the memory and the product number X3 of the connection part to perform correction calculations and obtain the measurement results.
[0052] According to one embodiment, in order to prevent unauthorized personnel or units from counterfeiting the device or tampering with the data, when the instrument body is connected to the connection part, the instrument body will read the data in the memory and verify it. If the verification is successful, the instrument body will search for the corresponding correction parameters according to the product number in the memory to perform correction calculations and obtain the measurement results. If a communication error occurs during the pairing process, the instrument body will perform error processing, such as issuing an alarm message, prompting an error message, etc.
[0053] Based on the above description, according to another aspect of the present application, a method for calibrating a current sensor is provided. Figure 7 : is a flow chart of a method for calibrating a current sensor according to an embodiment of the present application, comprising the following steps:
[0054] Step S701, for a current connection part determined in the one or more connection parts, determining an instrument body in the one or more instrument bodies to be connected to the current connection part;
[0055] Step S702, measuring a standard signal by a current measuring part connected to the current connecting part to obtain a measurement result;
[0056] Step S703, determining the calibration parameters corresponding to the current connection part and the currently connected instrument body according to the measurement result;
[0057] Step S704, determining the next instrument body in the one or more instrument bodies to be connected to the current connection part, and returning to step S702 until all the instrument bodies in the one or more instrument bodies are traversed;
[0058] Step S705, determining the next connection part in the one or more connection parts as the current connection part, and returning to step S701 until all the connection parts in the one or more connection parts are traversed.
[0059] According to some embodiments, a set of current sensors includes N connecting parts and M instrument bodies (N≥1, M≥1), the connecting parts and the current measuring parts are combined into one, and any instrument body may be used in combination with the N connecting parts, so that the whole set of equipment can be calibrated up to N×M times.
[0060] The connectors are numbered at the factory, X1-X N The device body is numbered when it leaves the factory, for example, Y1-Y M , and write the device number into the instrument body. When leaving the factory, ensure that the numbers of the connection part and the instrument body are unique.
[0061] When calibrating a certain connection part, first connect any instrument body to the connection part through the communication interface, use the standard source to generate n standard signals (n≥1), and then use the current sensor to measure these n standard signals. Each standard signal can be measured m times (m≥1) to obtain n×m measurement results. The error model is introduced to correct the measurement results so that the corrected measurement results are as close as possible to the original standard signal value. This process obtains the corresponding calibration parameters of the connection part. The main function of this process is to perform signal correction on the current measurement part, integration circuit module, signal conditioning module, amplifier circuit module, and analog-to-digital conversion module to eliminate or reduce the impact of system errors.
[0062] After completing the calibration, the correction parameters can be written into the memory of the connection part for calibration. When in use, the instrument body reads its own identification (such as the device number) and matches it with the information stored in the memory; or the correction parameters can be written into the instrument body with which it is calibrated. When in use, the instrument body reads the identification of the connection part (such as the product number) and matches it with the information stored in itself.
[0063] According to one embodiment, for a set of current sensors including 9 current measuring parts, 9 connecting parts and 3 instrument bodies, each of the 9 connecting parts is calibrated with the 3 instrument bodies respectively, so a total of 27 calibrations are required. After each calibration, the correction parameters are stored. If the correction parameters are stored in the memory of the connecting part, then each connecting part stores not only its own identification but also the correction parameters corresponding to the 3 instrument bodies respectively; if the correction parameters are stored in the instrument body, then each instrument body stores not only its own identification but also the correction parameters corresponding to the 9 connecting parts respectively.
[0064] so, Figure 7 The method shown may also include:
[0065] storing the calibration parameters corresponding to the current connection part and the currently connected instrument body in the memory of the current connection part; or
[0066] The calibration parameters corresponding to the current connection part and the currently connected instrument body are stored in the instrument body connected to the current connection part.
[0067] According to some embodiments, the entire factory calibration process can be to calibrate first, and then write all relevant information into the memory of the connection part and / or the instrument body; or, write part of the information before calibration and write another part of the information after calibration. For example, the information to be written includes the identification of the connection part, the identification of the instrument body, the correction parameters and the key parameters such as the range of the current measurement part and mechanical properties. Among them, the identification of the connection part, the identification of the instrument body and the key parameters such as the range of the current measurement part and mechanical properties can be written before calibration or after calibration, and one part can be written before calibration and the other part can be written after calibration; the correction parameters can be written once when a connection part and an instrument body are calibrated, or they can be written once when all the equipment is calibrated. As long as it can be ensured that the information to be written can be stored in a suitable location, this application does not impose any restrictions on the writing process of these information to be written.
[0068] According to some embodiments, in order to prevent unauthorized personnel or units from counterfeiting the device or tampering with the data, an encryption algorithm and an encryption key are further embedded in the memory during factory calibration, and a verification program is written in the instrument body. When the instrument body is connected to the connection part, the instrument body will read the data in the connection part memory and verify it. After the verification is passed, the device is matched or calibrated.
[0069] According to the current sensor and current measurement system provided by the present application, by storing the identification of the instrument body or the connection part matched with it and the corresponding correction parameters between the connection part and the instrument body in the connection part or the instrument body of the current sensor, more than one instrument body and more than one connection part of the current sensor can be freely paired, and the corresponding correction parameters after pairing are used to correct the electrical signal induced by the current measurement part, so that the intelligent pairing and accurate calibration of the current measurement part and the instrument body can be realized, the use process of the current sensor can be simplified, the operation difficulty is reduced, and the overall accuracy is improved. In addition, since the functions of the integrator and the signal conditioning part are integrated in the instrument body, the circuit corresponding to the integrator and the signal conditioning part will not be increased as the number of current measurement parts increases, and the memory for storing the identification of the instrument body, the identification of the connection part and the correction parameters is low in cost and small in size, so as not to increase the overall hardware cost of the current sensor. In addition, the current sensor is flexible in design, can work independently to meet the basic current measurement requirements, and can cooperate with external devices wirelessly or wired to build a measurement system. This diversified design method enables the current sensor to adapt to various application scenarios and provide users with flexible and efficient solutions.
[0070] Furthermore, the factory calibration method of the present application significantly improves the measurement accuracy and reliability of the current sensor. Through precise calibration and information writing, it effectively eliminates system errors, improves the accuracy of the measuring equipment, and ensures that the current sensor reaches the best working state when leaving the factory. At the same time, this method simplifies the calibration process in subsequent use and improves work efficiency.
[0071] In addition, the usage method of the present application realizes intelligent pairing and calibration between devices, improves measurement accuracy and safety, and effectively prevents the mixing of different sets of equipment and the risk of counterfeiting and tampering by reading and verifying the connection part memory information.
[0072] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.
Claims
1. A current sensor, characterized in that: include: One or more current measuring parts, used for sensing the current signal in the measured wire; One or more connecting parts, which are connected to the one or more current measuring parts in a one-to-one correspondence, and any one of the one or more connecting parts includes a signal acquisition unit and a memory, wherein the signal acquisition unit is used to collect the electrical signal induced by the current measuring part and transmit the collected electrical signal, and the memory is used to store the identification of the connecting part; One or more instrument bodies, each of which is connected to one of the one or more connecting parts, for receiving an electrical signal transmitted by the connecting part, converting the electrical signal into a digital signal, and correcting the digital signal according to a correction parameter corresponding to an identification of the connecting part connected to the instrument body and / or an identification of the instrument body.
2. The current sensor according to claim 1, characterized in that Each of the instrument bodies comprises: An integration circuit module, used to integrate the electrical signal from the signal acquisition unit to obtain an integrated signal; A first analog-to-digital conversion module, connected to the integration circuit module, and configured to convert the integrated signal into a digital signal; and The calculation module is connected to the first analog-to-digital conversion module and is used to correct the digital signal according to the correction parameter corresponding to the identification of the connection part connected to the instrument body and / or the identification of the instrument body.
3. The current sensor according to claim 1, characterized in that Each of the instrument bodies comprises: An electrical signal processing device, used for processing the electrical signal; A first analog-to-digital conversion module, connected to the electrical signal processing device, and configured to convert the signal processed by the electrical signal processing device into a digital signal; and a calculation module connected to the first analog-to-digital conversion module, and configured to correct the digital signal according to a correction parameter corresponding to an identifier of a connection portion connected to the instrument body and / or an identifier of the instrument body; The electrical signal processing device comprises an integration circuit module and an amplification circuit module connected in any order, or an integration circuit module and a signal conditioning module connected in any order, or an integration circuit module, an amplification circuit module and a signal conditioning module connected in any order, wherein: The amplifying circuit module is used to amplify the electrical signal; The integration circuit module is used to perform integration processing on the electrical signal; The signal conditioning module is used to perform signal conditioning on the electrical signal.
4. The current sensor according to claim 2 or 3, characterized in that: The instrument body also includes: A first transmission module, connected to the calculation module, configured to send the modified digital signal; and / or The first synchronization module is connected to the first analog-to-digital conversion module and is used to ensure that the sampling time of the first analog-to-digital conversion module is synchronized with the external host.
5. The current sensor according to any one of claims 1 to 3, characterized in that: The memory is also used to store the identification of one or more instrument bodies paired with the connecting part and the correction parameters corresponding to the one or more instrument bodies paired with the connecting part. The instrument body is used to determine the corresponding correction parameters in the memory through its own identification and correct the digital signal according to the correction parameters.
6. The current sensor according to any one of claims 1 to 3, characterized in that: The instrument body is also used to store the identification of one or more connecting parts paired and calibrated with the instrument body and the correction parameters corresponding to the one or more connecting parts paired and calibrated with the instrument body, determine the corresponding correction parameters by reading the identification of the connecting part connected thereto, and correct the digital signal according to the correction parameters.
7. A current measurement system, characterized in that: include: The current sensor according to any one of claims 1 to 6; as well as External hosts, including: a second transmission module, configured to receive a corrected digital signal from the current sensor; as well as An electric parameter calculation unit is connected to the second transmission module and is used to perform electric parameter calculation according to the corrected digital signal.
8. The system according to claim 7, characterized in that The external host also includes: A second analog-to-digital conversion module, configured to convert the received analog voltage signal into a digital voltage signal; and / or The second synchronization module is connected to the second analog-to-digital conversion module and is used to ensure that the sampling time of the voltage signal is synchronized with the current sensor.