A current sensor calibration and test system

Abstract

The utility model discloses a current sensor calibration and test system, including the cabinet, be equipped with host computer, ethernet control server, current generating device, positive and negative current switching device, current test device and the device to be tested in the cabinet, wherein, host computer is connected with ethernet control server, current test device and the device to be tested electricity respectively, current generating device, positive and negative current switching device, current test device all are connected in parallel with ethernet control server, current generating device is used to generate excitation current signal, and the device to be tested is used to send test signal to host computer, positive and negative current switching device is used to make excitation current signal switch between positive excitation current signal and reverse excitation current signal, and current test device is used to send current signal to host computer. The utility model can improve the test efficiency, realize positive and negative current calibration and improve test precision, and guarantee current sensor product quality.

Description

Technical Field

[0001] This utility model relates to the field of power measurement and sensors, and in particular to a current sensor calibration and testing system, which is especially suitable for high-precision high-current detection and automated calibration scenarios. Background Technology

[0002] As a key measurement component in power systems, industrial automation, new energy sources (such as electric vehicles and photovoltaic inverters), and smart grids, the accuracy, stability, and reliability of current sensors directly affect the accuracy of system control, safe operation, and energy metering. Therefore, precise calibration and comprehensive performance testing are crucial steps in the manufacturing, use, maintenance, and research and development of current sensors.

[0003] However, current current sensor calibration systems generally have the following limitations: 1) The communication protocol technology is lagging behind, relying on the RS232 interface, resulting in low transmission rate and weak anti-interference ability, making it difficult to meet high real-time requirements; 2) In the actual application of current sensors, it is necessary to measure forward and reverse currents, and the measurement of reverse current also requires calibration. However, the existing current sensor calibration systems are not adaptable enough, lack reverse current calibration capability, and cannot be adapted to sensors that require bidirectional measurement; 3) For calibrated sensors, no post-calibration accuracy test is performed. If a large error occurs during the calibration process, defective products will be sent directly to customers, causing quality problems.

[0004] Therefore, there is an urgent need for a highly automated, integrated, and universal current sensor calibration and testing system that can efficiently, accurately, and in a one-stop manner complete the calibration and testing of various key performance aspects of current sensors, thereby improving testing efficiency and accuracy. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of outdated communication protocols, insufficient adaptability, and lack of verification tests in existing current sensor calibration and testing systems. This invention provides a current sensor calibration and testing system that improves testing efficiency, enables forward and reverse current calibration, enhances testing accuracy, and ensures the quality of current sensor products.

[0006] To address the aforementioned technical problems, this utility model discloses a current sensor calibration and testing system, comprising a cabinet containing a host computer, an Ethernet control server, a current generator, a forward / reverse current switching device, a current testing device, and a device under test. The host computer is electrically connected to the Ethernet control server, the current testing device, and the device under test, respectively. The device under test is used to mount the current sensor. The current generator, the forward / reverse current switching device, and the current testing device are all connected in parallel to the Ethernet control server. The current generator generates an excitation current signal, which flows sequentially through the forward / reverse current switching device, the current testing device, and the device under test. The device under test sends a test signal to the host computer based on the excitation current signal flowing through the current sensor. The forward / reverse current switching device switches the excitation current signal between a forward excitation current signal and a reverse excitation current signal. The current testing device sends a current signal to the host computer based on the excitation current signal.

[0007] By adopting the above technical solution, the embodiments of this application use an Ethernet control server instead of the RS232 interface commonly used in the prior art for communication in the current sensor calibration and testing system, which greatly improves the communication speed and anti-interference capability. Furthermore, the current sensor calibration and testing system of this application also connects a forward / reverse current switching device and a current generating device in parallel to the Ethernet control server, so that the excitation current signal flows sequentially through the forward / reverse current switching device, the current testing device, and the current sensor installed in the device under test, thereby realizing the testing of the forward and reverse current detection capabilities of the current sensor.

[0008] In other words, the current sensor calibration and testing system of this application embodiment not only realizes the calibration of the forward and reverse current of the current sensor through the forward and reverse current switching device, but also sends the excitation current signal generated by the current generator to the current sensor set in the device under test after calibration, and receives the current value fed back by the current sensor through the host computer to perform the accuracy test after calibration, so as to avoid large errors in the calibration process, which would lead to defective current sensor products flowing out and causing production quality problems.

[0009] Therefore, compared with the prior art, the embodiments of this application optimize the structure of the current sensor calibration and testing system, add a forward and reverse current switching device, enhance the adaptability of the current sensor calibration and testing system, and improve the testing efficiency and accuracy of the current sensor calibration and testing system by adopting an Ethernet control server, thus ensuring the quality of current sensor products.

[0010] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system. The current sensor calibration and testing system further includes a first conducting device, which is connected in series between the forward and reverse current switching device and the current testing device, and is electrically connected to the Ethernet control server for conducting or disconnecting the excitation current signal.

[0011] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, the current sensor calibration and testing system further includes a voltage generating device and a second conducting device: the voltage generating device is electrically connected to the Ethernet control server and is used to generate an excitation voltage signal, the excitation voltage signal flows sequentially through the voltage generating device, the second conducting device and the device under test, the second conducting device is electrically connected to the Ethernet control server and is used to conduct or disconnect the excitation voltage signal.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, the current sensor calibration and testing system further includes a temperature sensor, the temperature sensor being electrically connected to the host computer and used to send a temperature signal to the host computer.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, the current sensor calibration and testing system further includes an identification device, the identification device being electrically connected to the host computer and used to send an identification signal to the host computer.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, the current sensor calibration and testing system further includes a human interaction device, the human interaction device being electrically connected to the host computer, and used to display the test information of the device under test.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, wherein the current sensor calibration and testing system further includes a cloud server, the cloud server being electrically connected to the host computer and used to store the test data of the current sensor calibration and testing system.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, wherein the cabinet has a constant temperature control device, and the constant temperature control device is used to regulate the temperature inside the cabinet.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, the current sensor calibration and testing system further includes a power protection device, which is disposed in the cabinet, and the power protection device is electrically connected to the host computer, the Ethernet control server, the current generator and the voltage generator respectively.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a current sensor calibration and testing system, wherein the host computer is an industrial control computer, the forward and reverse current switching device is a programmable switching circuit for forward and reverse current flow direction, the current generating device is a constant current power supply, the current testing device is a current tester, the first conducting device and the second conducting device are both switch control circuits, the voltage generating device is a constant voltage power supply, the identification device is a barcode scanner, the human interaction device is a display, and the power protection device is an uninterruptible power supply group. Attached Figure Description

[0019] Figure 1 A schematic diagram of a current sensor calibration and testing system is shown.

[0020] Figure 2 A schematic diagram of the human-machine interface of a current sensor calibration and testing system is shown. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0022] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0024] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0027] This application provides a current sensor calibration and testing system. This system is used to calibrate and test current sensors, which can improve the testing efficiency of current sensors, achieve forward and reverse current calibration, and improve testing accuracy.

[0028] Figure 1 This diagram illustrates the structure of the current sensor calibration and testing system provided in an embodiment of this application.

[0029] refer to Figure 1 The current sensor calibration and testing system 100 provided in this application embodiment includes a cabinet 101 (not shown in the figure). The cabinet 101 houses a host computer 110, an Ethernet control server 120, a current generator 130, a forward and reverse current switching device 140, a current testing device 150, and a device under test 200. Exemplarily, the host computer 110 in this application embodiment is an industrial control computer, and the current generator 130 is a constant current power supply, but this is not a limitation, and this application does not specifically limit these aspects.

[0030] For example, the cabinet 101 in this embodiment of the application also has a constant temperature control device 1011. The constant temperature control device 1011 can detect the internal temperature of the cabinet 101 and connect the inside of the cabinet 101 with the outside to adjust the internal temperature of the cabinet 101 and control the internal temperature of the cabinet 101 (i.e. the system temperature of the current sensor calibration and testing system 100) to a better working temperature (e.g., 25°C to 30°C), thereby improving the calibration and testing accuracy of the current sensor calibration and testing system 100.

[0031] For example, the current sensor calibration and testing system 100 of this application embodiment also includes a power protection device 1012. The power protection device 1012 is located in the cabinet 101 and is electrically connected to the host computer 110, the Ethernet control server 120, and other modules, so as to ensure the stable operation of the current sensor calibration and testing system 100 when the external power supply is unexpectedly disconnected, and to avoid damage to the test data of the current sensor calibration and testing system 100. For example, the power protection device 102 is an uninterruptible power supply (UPS), but it is not limited to this, and this application does not make specific limitations.

[0032] Specifically, such as Figure 1 As shown, the host computer 110 is electrically connected to the Ethernet control server 120, the current testing device 150, and the device under test 200, respectively. During testing, a current sensor (not shown) is installed on the device under test 200. Exemplarily, the current testing device 150 in this embodiment is a current meter, but it is not limited thereto. The current testing device 150 only needs to be able to detect the current value; this application does not impose specific limitations on it.

[0033] Continue to refer to Figure 1 The current generating device 130, the forward / reverse current switching device 140, and the current testing device 150 are all connected in parallel to the Ethernet control server 120, and the current generating device 130, the forward / reverse current switching device 140, the current testing device 150, and the device under test 200 are connected in series and electrically connected to each other. The Ethernet control server 120 is electrically connected to the current generating device 130 so that, at the start of testing, the current sensor calibration and testing system 100 of this embodiment can send a power supply signal to the current generating device 130 through the host computer 110 and the Ethernet control server 120, so that the current generating device 130 generates an excitation current signal. Exemplarily, the forward / reverse current switching device 140 of this embodiment is a programmable switching circuit for forward and reverse current flow, but it is not limited thereto, and this application does not specifically limit it.

[0034] Subsequently, since the current generating device 130, the forward and reverse current switching device 140, the current testing device 150 and the device under test 200 are connected in series, the excitation current signal generated by the current generating device 130 flows sequentially through the forward and reverse current switching device 140, the current testing device 150 and the current sensor installed in the device under test 200, so that the device under test 200 can send a test signal to the host computer 110 according to the excitation current signal flowing through the current sensor, and realize feedback of the test current value detected by the current sensor to the host computer 110.

[0035] The Ethernet control server 120 is electrically connected to the current testing device 150 so that when the test begins, the current sensor calibration and testing system 100 of this application embodiment can send a detection signal to the current testing device 150 through the host computer 110 and the Ethernet control server 120, so that the current testing device 150 sends a current signal to the host computer 110 according to the excitation current signal, thereby realizing feedback of the actual current value detected by the current testing device 150 to the host computer 110.

[0036] Therefore, the current sensor calibration and testing system 100 of this application embodiment can perform calculations on the host computer 110 using the actual current value detected by the current testing device 150 and the test current value detected by the current sensor, so as to calibrate and test the current sensor.

[0037] Furthermore, the aforementioned Ethernet control server 120 is electrically connected to the forward and reverse current switching device 140 so that when the test begins, the current sensor calibration and testing system 100 of this application embodiment can send a switching signal to the forward and reverse current switching device 140 through the host computer 110 and the Ethernet control server 120, so that the excitation current signal switches between the forward excitation current signal and the reverse excitation current signal.

[0038] Furthermore, the current sensor calibration and testing system 100 of this application embodiment can use the forward and reverse current switching device 140 to allow the forward excitation current signal to flow through the current testing device 150 and the current sensor provided in the device under test 200, or the reverse excitation current signal to flow through the current testing device 150 and the current sensor provided in the device under test 200, thereby realizing the calibration and detection of the forward and reverse current of the current sensor, and enhancing the adaptability of the current sensor calibration and testing system 100 of this application embodiment.

[0039] In summary, the difference between the current sensor calibration and testing system 100 of this application and existing current sensor calibration methods is as follows:

[0040] In this embodiment, the current sensor calibration and testing system 100 uses an Ethernet control server 120 instead of the RS232 interface commonly used in the prior art for communication, greatly improving the communication speed and anti-interference capability. Furthermore, the current sensor calibration and testing system 100 in this embodiment also uses a forward / reverse current switching device 140 to test the forward and reverse current detection capabilities of the current sensor.

[0041] In other words, the current sensor calibration and testing system 100 of this application embodiment not only realizes the calibration of the forward and reverse current of the current sensor through the forward and reverse current switching device 140, but also enables the excitation current signal generated by the current generating device 130 to be transmitted to the current sensor installed in the device under test 200 through the host computer 110 and the Ethernet control server 120 after calibration. The host computer 110 receives the current value fed back by the current sensor to perform the accuracy test after calibration, avoiding large errors during the calibration process, which could lead to defective current sensor products being shipped out and causing production quality problems.

[0042] Therefore, compared with the prior art, the embodiments of this application optimize the structure of the current sensor calibration and testing system 100, add a forward and reverse current switching device 140, enhance the adaptability of the current sensor calibration and testing system 100, and use an Ethernet control server 120 to improve the testing efficiency and accuracy of the current sensor calibration and testing system 100, thus ensuring the quality of current sensor products.

[0043] For example, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes a first conduction device 131.

[0044] Specifically, such as Figure 1 As shown, the first conducting device 131 is connected in series between the forward / reverse current switching device 140 and the current testing device 150. The first conducting device 131 has a conduction control circuit, which can conduct and interrupt the circuit between the forward / reverse current switching device 140 and the current testing device 150. Thus, the Ethernet control server 120 is electrically connected to the first conducting device 131 to send a conduction signal or an interruption signal to the first conducting device 131 during the test, so as to conduct the excitation current signal flowing through the circuit between the forward / reverse current switching device 140 and the current testing device 150, enabling the excitation current signal to be transmitted to the current sensor installed in the device under test 200, or to disconnect the circuit between the forward / reverse current switching device 140 and the current testing device 150.

[0045] For example, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes a voltage generating device 210 and a second conducting device 211.

[0046] Specifically, the voltage generator 210 is used to generate an excitation voltage signal. Since the product being tested is a current sensor, an excitation voltage signal from outside the product is required to power the current sensor, enabling it to feed back the test current value to the host computer 110 after receiving the excitation current signal. The Ethernet control server 120 is electrically connected to the voltage generator 210 to send a power-on signal (e.g., a power supply signal) to the voltage generator 210 during the test, causing the voltage generator 210 to generate the excitation voltage signal.

[0047] Since the voltage generating device 210, the second conducting device 211, and the device under test 200 are connected in series, the excitation voltage signal can flow from the voltage generating device 210 through the second conducting device 211 and the device under test 200 in sequence. The second conducting device 211 has a conduction control circuit that can turn on and off the circuit between the voltage generating device 210 and the device under test 200. Therefore, the Ethernet control server 120 is electrically connected to the second conducting device 211 to send a conduction signal or an interruption signal to the second conducting device 211 during the test, so as to turn on the excitation voltage signal between the voltage generating device 210 and the device under test 200, or to disconnect the circuit between the voltage generating device 210 and the device under test 200.

[0048] For example, the voltage generating device 210 in this application embodiment is a constant voltage power supply, and the first conducting device 131 and the second conducting device 211 are both switch control circuits, but are not limited thereto. This application does not make specific limitations on this. The first conducting device 131 and the second conducting device 211 can also be other forms of high current switches, such as relays.

[0049] Exemplary, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes a temperature sensor 160. Specifically, the temperature sensor 160 is electrically connected to the host computer 110 and is used to send a temperature signal to the host computer 110. The temperature signal includes the temperature value of the current sensor set in the device under test 200 detected by the temperature sensor. However, it is not limited to this. In other possible implementations, a magnetic field sensor may also be included, so that the detected temperature signal and magnetic field signal of the device under test 200 can be fed back to the host computer 110 to dynamically supplement temperature drift and electromagnetic interference in the parameters of the calibrated current sensor, thereby further improving the testing accuracy of the current sensor calibration and testing system 100.

[0050] Exemplarily, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes an identification device 170. Specifically, the identification device 170 is electrically connected to the host computer 110 and is used to send an identification signal to the host computer 110. Exemplarily, the identification device 170 of this application embodiment includes a barcode scanner, wherein the identification signal includes the serial number of the current sensor installed in the device under test 200 read by the barcode scanner, thereby determining the model of the current sensor, so that the testing system in the host computer 110 can automatically switch to a calibration mode matching the model of the current sensor. However, this is not limited to this. The specific configuration of the identification device 170 in this application embodiment is not limited, as long as it can be used to identify the model of the current sensor installed in the device under test 200.

[0051] Exemplarily, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes a human interaction device 180. Specifically, refer to Figure 1 and combined Figure 2 The human-computer interaction device 180 is electrically connected to the host computer 110, thereby enabling it to send test procedures and calibration parameter setting instructions to the host computer 110 and display the test data of the current sensor returned by the host computer 110. In this embodiment, the human-computer interaction device 180 can be used to display test information (e.g., test data) of the device under test. Exemplarily, the human-computer interaction device 180 is a display; furthermore, it also includes a human-computer interaction device, such as a keyboard or touchscreen, for setting test procedures and parameters.

[0052] In addition, such as Figure 2 As shown, the human-interactive interface 181 of the human-interactive device 180 of the current sensor calibration and testing system 100 in this application embodiment can realize the real-time display of test data transmitted back by the host computer 110 during the testing process. For example, the human-interactive interface 181 of the human-interactive device 180 includes test data information such as test mode 181a, process steps 181b, serial number of the current sensor under test 181c, test result 181d, and test status 181e.

[0053] Exemplary, in some possible implementations, the current sensor calibration and testing system 100 of this application embodiment further includes a cloud server 190. Specifically, as Figure 1As shown, the cloud server 190 is electrically connected to the host computer 110 and is used to store the test data of the current sensor calibration and testing system 100, supporting remote monitoring and cross-device parameter synchronization. When after-sales problems occur with the current sensor product, analysis and investigation of the current sensor are required, which necessitates the use of the current sensor's test data. Therefore, during the testing process, the host computer 110 sends the product information and test data of the current sensor set in the device under test 200 to the cloud server 190. The cloud server 190 receives and stores the product information and test data of the current sensor, realizing intelligent management of the test data.

[0054] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A current sensor calibration and testing system, characterized in that, The system includes a server rack, which houses a host computer, an Ethernet control server, a current generator, a forward / reverse current switching device, a current testing device, and a device under test; wherein, The host computer is electrically connected to the Ethernet control server, the current testing device, and the device under test, respectively. The device under test is used to install the current sensor. The current generating device, the forward and reverse current switching device, and the current testing device are all connected in parallel with the Ethernet control server. The current generating device is used to generate an excitation current signal, which flows sequentially through the forward and reverse current switching device, the current testing device, and the device under test. The device under test is used to send a test signal to the host computer based on the excitation current signal flowing through the current sensor. The forward and reverse current switching device is used to switch the excitation current signal between a forward excitation current signal and a reverse excitation current signal. The current testing device is used to send a current signal to the host computer based on the excitation current signal.

2. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system further includes a first conduction device, which is connected in series between the forward and reverse current switching device and the current testing device, and is electrically connected to the Ethernet control server for conducting or disconnecting the excitation current signal.

3. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system also includes a voltage generator and a second conduction device: The voltage generating device is electrically connected to the Ethernet control server and is used to generate an excitation voltage signal. The excitation voltage signal flows sequentially through the voltage generating device, the second conducting device, and the device under test. The second conducting device is electrically connected to the Ethernet control server and is used to turn the excitation voltage signal on or off.

4. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system also includes a temperature sensor, which is electrically connected to the host computer and is used to send a temperature signal to the host computer.

5. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system also includes an identification device, which is electrically connected to the host computer and is used to send an identification signal to the host computer.

6. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system also includes a human interaction device, which is electrically connected to the host computer and is used to display the test information of the device under test.

7. The current sensor calibration and test system of claim 1, wherein, The current sensor calibration and testing system also includes a cloud server, which is electrically connected to the host computer and is used to store the test data of the current sensor calibration and testing system.

8. The current sensor calibration and test system of claim 1, wherein, The cabinet is equipped with a temperature control device, which is used to regulate the temperature inside the cabinet.

9. The current sensor calibration and test system of claim 3, wherein, The current sensor calibration and testing system also includes a power protection device, which is located in the cabinet. The power protection device is electrically connected to the host computer, the Ethernet control server, the current generator, and the voltage generator.

10. The current sensor calibration and test system of any one of claims 1 to 9, wherein, The host computer is an industrial control computer, the forward and reverse current switching device is a programmable circuit for switching the forward and reverse flow direction of current, the current generating device is a constant current power supply, the current testing device is a current tester, the first conducting device and the second conducting device are both switch control circuits, the voltage generating device is a constant voltage power supply, the identification device is a barcode scanner, the human interaction device is a display, and the power protection device is an uninterruptible power supply group.

Images