Data acquisition and processing device of mobile AC / DC electric appliance

Abstract

The invention relates to a data acquisition and processing device of a mobile AC / DC electric appliance. The device comprises an acquisition module (1), a lower computer (2) and an upper computer (3) which are connected in sequence, the input end of the acquisition module (1) is connected with tested equipment; the acquisition module (1) is used for acquiring a direct current voltage or an alternating current voltage generated when a tested device works, converting the direct current voltage or the alternating current voltage into a voltage digital signal and transmitting the voltage digital signal to the lower computer (2); the lower computer (2) comprises an acquisition board card and is used for converting the voltage digital signal into an analog signal and transmitting the analog signal to the upper computer (3); and the upper computer (3) is used for processing the analog signal. Compared with the prior art, the system has the advantages of simultaneously supporting acquisition and processing of multi-channel direct current and alternating current, being high in precision, wide in measuring range, movable, wide in application range, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of electrical measurement and control, and in particular to a data acquisition and processing device for a mobile AC / DC electrical appliance. Background Art

[0002] Graphical data acquisition and measurement systems are currently the most widely used testing instruments in testing departments to determine the quality of electrical appliances. However, most are fixed, imported models. Fixed waveform acquisition instruments are often a luxury due to their immobility. Comparable foreign products are generally not compatible with both AC and DC, and the testing equipment is fixed to a single device. Chip prices are prohibitively expensive, and maintenance costs and cycles are prohibitively long, making them immobile. Alternatively, mobile digital displays, such as multimeters, only display numbers, but are incapable of waveform analysis or transient measurement. These limitations make it impossible to accurately determine faulty circuits.

[0003] Low-voltage data acquisition and measurement Low-voltage electrical appliance test data acquisition and processing system is a scientific instrument used in the fields of power and electrical engineering, electronics and communication technology, and the digital acquisition system effectively provides a more intuitive and simpler experience.

[0004] Currently, there are digital acquisition and processing systems that can only acquire and process DC or AC power, but lack corresponding systems for acquiring and processing both DC and AC power simultaneously. As a result, it is impossible to measure the AC distorted waves that appear in the DC waves, which may burn out the equipment.

[0005] After searching, Chinese utility model patent publication number CN 206710499 U discloses a Rogowski coil-based current data acquisition device, belonging to the field of current acquisition devices. The Rogowski coil-based current data acquisition device includes an MCU processing unit for receiving and collecting data and calculating electric energy parameters, a voltage acquisition unit for collecting voltage data, a Rogowski coil current acquisition unit for collecting current data, and a clock processing unit for recording a perpetual calendar. The voltage acquisition unit and the Rogowski coil current acquisition unit are both electrically connected to the MCU processing unit. This existing patent has problems such as not collecting AC data, not imaging the collected data, and low time processing accuracy.

[0006] After searching, Chinese invention patent publication number CN 107870274 A discloses a low-voltage electrical product testing and inspection device and method, comprising a power supply module, a signal processing module, a display module, a data storage and transmission module, a data acquisition module, a warning module, and a protection module. The power supply module includes an input power supply for supplying power to the low-voltage electrical product under test; the data acquisition module includes a voltage acquisition module and a current acquisition module for collecting test data from the low-voltage electrical product under test; the data acquisition module is electrically coupled to the signal processing module via the data storage and transmission module; the protection module is electrically coupled to the signal processing module; the power output module is electrically coupled to the protection module; and the warning module is electrically coupled to the signal processing module. This existing patent suffers from the failure to collect DC data, the lack of imaging of the collected data, and low time processing accuracy.

[0007] After searching, the international application number PCT / CN2019 / 120488 discloses a DC power supply intelligent integrated monitoring instrument, including a signal acquisition circuit, a central processing unit, a human-machine interface and a storage unit. The signal acquisition circuit is connected to the DC power supply, and the signal acquisition circuit is used to collect the voltage data and current data of the DC power supply in real time: the central processing unit is connected to the signal acquisition circuit, and the central processing unit is used to calculate the electric quantity data based on the voltage data and current data and to judge whether the data is abnormal, and output an alarm signal when the data is abnormal: the human-machine interface is connected to the central processing unit and is used to cyclically display the voltage data, current data and electric quantity data: the storage unit is connected to the central processing unit, and the storage unit is used to store voltage data, current data and electric quantity data. The existing patent has the problems of not collecting AC data, not imaging and displaying the collected data, and low time processing accuracy.

[0008] How to realize data collection and processing of mobile AC and DC electrical appliances has become a technical problem that needs to be solved. Summary of the Invention

[0009] The purpose of the present invention is to provide a data acquisition and processing device for a mobile AC / DC electrical appliance in order to overcome the above-mentioned defects in the prior art.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] According to one aspect of the present invention, a data acquisition and processing device for a mobile AC / DC electrical appliance is provided, the device comprising an acquisition module, a slave computer, and a host computer connected in sequence, wherein an input end of the acquisition module is connected to a device under test;

[0012] The acquisition module is used to collect the DC current and voltage and / or AC current and voltage generated by the device under test during operation, and convert them into voltage digital signals, which are then transmitted to the lower computer;

[0013] The lower computer includes an acquisition board for converting the voltage digital signal into an analog signal and transmitting it to the upper computer;

[0014] The host computer is used to process the received analog signal.

[0015] Preferably, the acquisition module includes a voltage signal unit and a current signal unit connected in parallel, and the number of acquisition channels of the acquisition module is m.

[0016] Preferably, the lower computer further includes a power supply unit and a box; the box is a rectangular parallelepiped; the acquisition board and the power supply unit are fixed inside the box; one side of the box is provided with a power lock switch, a network cable interface, and a channel interface, and the other side opposite thereto is provided with a power cord socket, a status indicator light, a USB interface, and a channel interface; the acquisition board is respectively connected to the power lock switch, the network cable interface, the channel interface, the status indicator light, the USB interface, and the power cord socket;

[0017] The network cable interface is fixed to the box with screws;

[0018] The power lock switch has a keyhole;

[0019] A handle is provided on one side of the box, and heat dissipation holes are provided on the other sides;

[0020] The acquisition board includes an analog signal input board, an analog signal output board, a digital signal input board and a digital signal output board.

[0021] More preferably, the voltage signal unit is used to convert the collected DC or AC voltage signal into a voltage digital signal and transmit it to the lower computer;

[0022] The voltage signal unit includes a voltage sensor and a box;

[0023] The voltage sensor is fixed inside the box;

[0024] The box is a rectangular parallelepiped, with a power switch and an output interface on one side of the box, a power cord socket and an input interface on the other side opposite thereto, and heat dissipation holes on the other sides; the voltage sensor is connected to the power switch, input interface, and output interface respectively;

[0025] A handle is provided on one side of the box body, and heat dissipation holes are provided on the other sides.

[0026] More preferably, the current signal unit includes a Rogowski coil and an integrating amplifier connected in sequence, the Rogowski coil collects the working DC current signal and / or AC current signal of the device under test and sends it to the integrating amplifier; the integrating amplifier is connected to the lower computer via a network cable;

[0027] The current signal unit is used to convert the collected DC or AC current into a voltage digital signal and transmit it to the lower computer through a network cable.

[0028] More preferably, the amplifier has n control ranges for controlling the accuracy of current, and the n control ranges are interlocked.

[0029] Preferably, the lower computer and the upper computer are connected via a USB cable.

[0030] Preferably, the current detection range of the device is 1-100KA, the voltage detection range depends on the voltage range of the voltage sensor, the frequency of waveform acquisition is one hundred thousandth of a second, and the time is calculated based on the sampling Hertz number and the number of sampling points.

[0031] Preferably, the processing of the received analog signal includes: processing the analog signal includes converting the analog signal into a graphic image, outputting a waveform diagram of current and voltage, measuring the graphical voltage, current and time, calculating the current and voltage values, automatically generating an analysis report, saving the measurement data, and printing the measurement data.

[0032] More preferably, the waveform diagrams of the current and voltage include instantaneous waveforms, rising edge waveforms, falling edge waveforms, and distorted waves; the calculation of the current and voltage values includes the peak value, valley value, effective value, peak-to-peak value, power factor and power-on time of the current and voltage.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The device of the present invention supports the acquisition of multi-channel direct current and alternating current, and supports the acquisition and processing of current, voltage and time, including waveform imaging display, which facilitates detection.

[0035] 2. The minimum monitoring time of the device of the present invention is 1 / 100,000 of a second, and it can achieve 24-hour real-time monitoring. The error of detecting the entire band is within 0.9%, and within 0.5% for certain bands. The current measurable range is 1A~100KA, and the voltage measurable range changes with the upgrade of the voltage sensor. The time is calculated according to the sampling Hz number and the number of sampling points, with a wide range and high accuracy.

[0036] 3. The device of the present invention has modular design of each component, which is easy to replace, and has strong upgrade space in both software and hardware, which facilitates the evolution of equipment technology.

[0037] 4. The device of the present invention is split-type, with simple connection, plug-and-play, and compact size, making the device a movable external detection device with a wide range of applications. It can be moved to any site for detection and testing, including large-scale fixed equipment on-site actual working conditions to collect parameters and issue a report on the spot.

[0038] 5. The device of the present invention mainly uses domestic accessories and supplemented by foreign accessories, which improves localization and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the structure of the device of the present invention;

[0040] Figure 2 This is a schematic diagram of irregular waveform collection in the present invention;

[0041] Figure 3 This is a schematic diagram of the instantaneous rising edge waveform acquisition in the present invention;

[0042] Figure 4 This is a schematic diagram of instantaneous falling edge waveform acquisition in the present invention;

[0043] Figure 5 This is a schematic diagram of DC waveform acquisition in the present invention;

[0044] Figure 6 This is a schematic diagram of abnormal wave collection in the present invention;

[0045] Figure 7 This is a schematic diagram of waveform acquisition for stationary point measurement in the present invention;

[0046] Figure 8 This is a front view of the lower computer in the present invention;

[0047] Figure 9 It is a rear view of the lower computer in the present invention;

[0048] Figure 10 It is a left view of the lower computer in the present invention;

[0049] Figure 11 It is a right view of the lower computer in the present invention;

[0050] Figure 12 This is a front view of the voltage signal unit in the present invention;

[0051] Figure 13 It is a rear view of the voltage signal unit in the present invention;

[0052] Figure 14 It is a left side view of the voltage signal unit in the present invention;

[0053] Figure 15It is a right side view of the voltage signal unit in the present invention;

[0054] In the accompanying drawings, 1 is the acquisition module, 2 is the lower computer, 3 is the upper computer, 11 is the voltage signal unit, 12 is the current signal unit, 121 is the Rogowski coil, 122 is the integrating amplifier, 21 is the box, 212 is the power lock switch, 213 is the status indicator light, 214 is the channel interface, 215 is the network cable interface, 218 is the screw, 219 is the support foot, 210 is the handle, 221 is the USB interface, 222 is the power cord socket, 223 is the heat dissipation hole, 311 is the power switch, 312 is the output interface, and 313 is the input interface. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0056] This invention relates to a mobile data acquisition and imaging device for AC / DC electrical appliances. This device offers precise data, supports multi-channel sampling, and supports simultaneous graphical acquisition of current, voltage, and time. It can collect parameters and generate reports on-site during actual operating conditions of large, fixed equipment. Both the software and hardware offer significant room for improvement. Continuous upgrades are underway in practical applications, and diffraction equipment based on this device is being developed.

[0057] This embodiment relates to a data acquisition and processing device for a mobile AC / DC electrical appliance, such as Figure 1 As shown, it includes an acquisition module 1, a slave computer 2 and a host computer 3 connected in sequence. The acquisition module 1 includes a voltage signal unit 11 and a current signal unit 12 connected in parallel. The host computer 3 includes a display screen, a processor and a memory.

[0058] like Figures 8 to 11 As shown, the lower computer 2 includes a 24V power supply and an acquisition board. The lower computer 2 is a rectangular box 21, with the acquisition board fixed inside. One side of the box 21 is equipped with a power lock switch 212, a network cable interface 215, and a channel interface 214. The other side opposite the box is equipped with a power cord jack 222, a status indicator 213, a USB interface 221, and a channel interface 214. The acquisition board is connected to the power lock switch 212, the network cable interface 215, the channel interface 214, the status indicator 213, the USB interface 221, and the power cord jack 222, respectively.

[0059] The function of the slave computer 2 is to convert the digital signals input through the integrating amplifier 122 and the voltage signal unit 11 into analog signals and transmit them to the master computer 3 via the USB interface. The slave computer 2 also converts analog signal instructions from the master computer 3 into digital signal instructions and transmits them to the integrating amplifier 122 via the network cable interface 215. Each network cable interface 215 is fixed to the housing 21 with a pair of screws 218. The power lock switch 212 has a keyhole; turning the key turns on the power.

[0060] A handle 210 is provided on one surface of the housing 21 of the lower computer 2 , and heat dissipation holes 223 are provided on the other surfaces.

[0061] like Figures 12 to 15 As shown, the voltage signal unit 11 includes a 24V power supply, four voltage sensors, and a plug-in interface. The voltage signal unit 11 proportionally reduces the actual collected voltage to 0-10V and transmits it to the lower computer 2. The voltage signal unit 11 also includes a housing 21. The housing 21 is a rectangular parallelepiped. One side of the housing 21 is provided with a power switch 311 and an output interface 312. The other side opposite the housing 21 is provided with a power cord jack 222 and an input interface 313. Other sides are provided with heat dissipation holes 223. The voltage sensors are fixed inside the housing 21 and are connected to the power switch 311, input interface 313, and output interface 312, respectively. The output end of the voltage signal unit 11 is connected to the lower computer 2 via a network cable.

[0062] The current signal unit 12 includes a Rogowski coil 121 and an integrating amplifier 122 , and converts the collected actual current into a digital signal.

[0063] Acquisition module 1 samples the current and voltage of the device under test. The operating current is collected by Rogowski coil 121 and converted into a 0-10V digital voltage signal by integrating amplifier 122, which is then transmitted to slave computer 2. The operating voltage is converted into a 0-10V digital voltage signal by voltage signal unit 11, which is then transmitted to slave computer 2. Slave computer 2 converts the digital signal into an analog signal via an acquisition board and transmits it to master computer 3. Master computer 3 converts the analog signal into a graphic image and displays it on the display.

[0064] Because integrating amplifier 122 must maintain maximum current accuracy, it has five adjustable ranges: off, 0A-100A, 100A-1000A, 1000A-10kA, and 10kA-100kA. Host computer 3 transmits commands to the acquisition board in slave computer 2, which generates digital output signals that are transmitted via a network cable to integrating amplifier 122 to control the five ranges. These five ranges are interlocked, allowing only a single selection at a time to avoid conflicts caused by selecting multiple simultaneously.

[0065] The upper computer 3 and the lower computer 2 are connected with a USB cable, and the lower computer 2 is connected with the integrating amplifier 122 and the voltage signal unit 11 with a network cable.

[0066] The host computer 3 receives the analog signal and images the analog signal as a current and voltage waveform diagram. It can measure and calculate the graphical voltage, current and time (including the peak and valley values of current and voltage, the effective value of current and voltage, the power factor of current and voltage, the power-on time of current and voltage, the state diagram when current and voltage are distorted, and the magnification and reduction of the same time period of 7-channel current and voltage for comparison), save the data, and print the data.

[0067] The most accurate calculation method is to calculate the effective value from the waveform. The effective value is considered from the perspective of the work done by the current. After accumulating the work done by each instantaneous value of the current, the average value of the current within one cycle is calculated.

[0068] The device's time is calculated based on the sampling Hz and the number of sampling points. For example, at 50 Hz, 5,000 sampling points are collected per second, and collecting 5,000 sampling points equals one second. The sampling trigger requirements for power-on life are relatively low, supporting both rising and falling edge triggering, and capturing instantaneous waveforms with an accuracy of one hundred-thousandth of a second.

[0069] This device supports both AC and DC sampling, waveform imaging, high-precision data storage, retrieval, and printing, and real-time measurement. Components primarily utilize domestically produced components, supplemented by foreign ones, to reduce costs and increase localization. The device is pluggable and assembled in separate parts, combining the advantages of multiple acquisition devices. Its compact size and modular design make it a portable, external testing device. Suitable for testing and inspection at any site, it can collect parameters under actual operating conditions on large, fixed equipment and generate on-site reports. It can be moved to power stations, mountains, plains, deserts, and anywhere else, for on-site testing.

[0070] The rising edge waveform is as follows Figure 2 As shown, the falling edge waveform is as follows Figure 3 As shown, the irregular waveform is as Figure 4 shown.

[0071] DC waveform such as Figure 5 As shown, the state diagram when current and voltage are distorted is collected as follows Figure 6 As shown, the stationary point measurement waveform is collected as follows Figure 7 shown.

[0072] This device supports both AC and DC sampling, waveform imaging, high-precision data storage, retrieval, and printing, and real-time measurement. Components primarily utilize domestically produced components, supplemented by foreign ones, to reduce costs and increase localization. The device is pluggable and assembled in separate parts, combining the advantages of multiple acquisition devices. Its compact size and modular design make it a portable, external testing device. Suitable for testing and inspection at any site, it can collect parameters under actual operating conditions on large, fixed equipment and generate on-site reports. It can be moved to power stations, mountains, plains, deserts, and anywhere else, for on-site testing.

[0073] The device features seven acquisition channels, capable of simultaneously monitoring seven circuits. Three control lines control the switching of the external current transformer. The current measurement range is 1A to 100kA, depending on the parameters of the Rogowski coil. The voltage measurement range depends on the parameters of the voltage sensor, such as 0.583V to 1kV, 1kV to 2kV, or even higher. The minimum monitoring time is 100,000th of a second, enabling 24-hour monitoring. Testing by STIEE, ilac-MRA, and CNAS has revealed an error of less than 0.9% across all bands, and within 0.5% in some bands. This ensures a wide range and high accuracy.

[0074] At the same time, there is ample room for improvement in both software and hardware. The measurable ranges of current and voltage have been increased with the upgrade of the Rogowski coil and voltage sensor, respectively. Practical applications are still being continuously upgraded, and diffraction equipment is being developed based on this equipment.

[0075] The device has stable data acquisition and processing capabilities and has been put into actual test and inspection systems. It has participated in multiple field operations to conduct on-site calibration of electrical switches, inspect immovable electrical equipment, and participate in on-site emergency repairs and field line surveys.

[0076] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A data acquisition and processing device for a mobile AC / DC electrical appliance, characterized in that: The device comprises an acquisition module (1), a lower computer (2) and an upper computer (3) connected in sequence, wherein the input end of the acquisition module (1) is connected to the device under test; The acquisition module (1) is used to acquire the DC current and voltage and / or AC current and voltage generated when the device under test is working, and convert them into voltage digital signals, which are then transmitted to the lower computer (2); The lower computer (2) includes an acquisition board for converting the voltage digital signal into an analog signal and transmitting it to the upper computer (3); The host computer (3) is used to process the received analog signal.

2. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 1, characterized in that: The acquisition module (1) comprises a voltage signal unit (11) and a current signal unit (12) connected in parallel, and the number of acquisition channels of the acquisition module (1) is m.

3. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 1, characterized in that: The lower computer (2) further comprises a power supply unit and a box (21); the box (21) is a rectangular parallelepiped; the acquisition board and the power supply unit are fixed inside the box (21); a power lock switch (212), a network cable interface (215) and a channel interface (214) are provided on one side of the box (21); a power line socket (222), a status indicator light (213), a USB interface (221) and a channel interface (214) are provided on the other side opposite thereto; the acquisition board is connected to the power lock switch (212), the network cable interface (215), the channel interface (214), the status indicator light (213), the USB interface (221) and the power line socket (222) respectively; The network cable interface (215) is fixed to the box (21) with screws (218); The power lock switch (212) has a key hole; A handle (210) is provided on one surface of the box body (21), and heat dissipation holes (223) are provided on the other surfaces; The acquisition board includes an analog signal input board, an analog signal output board, a digital signal input board and a digital signal output board.

4. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 2, characterized in that: The voltage signal unit (11) is used to convert the collected DC or AC voltage signal into a voltage digital signal and transmit it to the lower computer (2); The voltage signal unit (11) includes a voltage sensor and a box (21); The voltage sensor is fixed inside the box (21); The box (21) is a rectangular parallelepiped, with a power switch (311) and an output interface (312) provided on one side of the box (21), a power cord socket (222) and an input interface (313) provided on the other side opposite thereto, and heat dissipation holes (223) provided on the other sides; the voltage sensor is connected to the power switch (311), the input interface (313) and the output interface (312) respectively; A handle (210) is provided on one surface of the box body (21), and heat dissipation holes (223) are provided on the other surfaces.

5. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 2, characterized in that: The current signal unit (12) comprises a Rogowski coil (121) and an integrating amplifier (122) connected in sequence, wherein the Rogowski coil (121) collects a working DC current signal and / or AC current signal of the device under test and sends the signal to the integrating amplifier (122); the integrating amplifier (122) is connected to a lower computer (2) via a network cable; The current signal unit (11) is used to convert the collected direct current or alternating current into a voltage digital signal, and transmit the signal to the lower computer (2) via a network cable.

6. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 5, characterized in that: The amplifier (122) has n control ranges for controlling the accuracy of current, and the n control ranges are interlocked.

7. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 1, characterized in that: The lower computer (2) and the upper computer (3) are connected via a USB cable.

8. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 1, characterized in that: The current detection range of the device is 1-100KA, the voltage detection range depends on the voltage range of the voltage sensor, the frequency of the waveform acquisition is one hundred thousandth of a second, and the time is calculated based on the sampling Hertz number and the number of sampling points.

9. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 1, characterized in that: The processing of the received analog signal includes: converting the analog signal into a graphic image, outputting a waveform diagram of current and voltage, measuring the graphical voltage, current and time, calculating the current and voltage values, automatically generating an analysis report, saving the measurement data, and printing the measurement data.

10. The data acquisition and processing device for a mobile AC / DC electrical appliance according to claim 9, characterized in that: The waveform diagrams of the current and voltage include instantaneous waveforms, rising edge waveforms, falling edge waveforms, and distorted waves; the calculation of the current and voltage values includes the peak value, valley value, effective value, peak-to-peak value, power factor, and power-on time of the current and voltage.

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