Electromagnetic information acquisition filtering device

Abstract

The utility model relates to the field of electromagnetic information acquisition devices, in particular to an electromagnetic information acquisition filtering device. Comprising a data acquisition and processing unit, the data acquisition and processing unit comprises a master control module, the output end of the master control module is connected with an electromagnetic environment detection software platform through the Ethernet, and the input end of the master control module is connected with an electric field acquisition and processing module, a magnetic field acquisition and processing module, a peak voltage acquisition and processing module and an alternating current and direct current acquisition and processing module. The electric field acquisition and processing module is connected with the electric field sensor, the magnetic field acquisition and processing module is connected with the magnetic field sensor, the peak voltage acquisition and processing module is connected with the alternating-current power grid conduction emission device through the 50Hz filtering module, and the input end of the alternating-direct current acquisition and processing module is connected with the alternating-current power grid conduction emission device and the direct-current power grid conduction emission device. According to the utility model, electromagnetic interference signals in an environment to be detected can be acquired and then uploaded to a software platform, and electromagnetic interference information in the environment to be detected can be accurately detected.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic information acquisition devices, and particularly relates to an electromagnetic information acquisition and filtering device. Background Art

[0002] In the existing power industry, filters are commonly used. Filters can filter interference bidirectionally. However, in some usage scenarios, it is not only necessary to filter interference, but also to measure the interference signals in the device or the detection space, and use the measured interference data for further analysis. Therefore, there is a lack of relevant equipment for accurately measuring and uploading the interference signals in the space or device to be detected to the software platform. Since the environmental electromagnetic signals sensed by the electric field and magnetic field probes are weak, it poses high requirements on the performance of the analog signal conditioning circuit. While ensuring a certain amplification ability, it must also have a high signal-to-noise ratio, otherwise the system cannot detect weak electromagnetic field signals. The electric field sensor can detect and rectify the received electric field signal into direct current, which requires the sensor to have a certain frequency response flatness in the range of 10 kHz to 400 MHz to ensure accurate detection results. At the same time, since the electric field signal is weak, it is required that the background noise of the relevant processing circuit of the sensor must be controlled within a certain range, making it much smaller than the useful signal. These requirements all pose high requirements on the design of the interference signal acquisition device. Summary of the Utility Model

[0003] The problem to be solved by the utility model is to provide a device that can accurately detect the electromagnetic interference information in the environment to be measured.

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the utility model to solve its technical problems is: an electromagnetic information acquisition and filtering device. It includes a data acquisition and processing unit, and the data acquisition and processing unit includes a main control module. The output end of the main control module is connected to the electromagnetic environment detection software platform through Ethernet. The input end of the main control module is connected to an electric field acquisition and processing module, a magnetic field acquisition and processing module, a spike voltage acquisition and processing module, and an AC / DC current acquisition and processing module. The electric field acquisition and processing module is connected to an electric field sensor, the magnetic field acquisition and processing module is connected to a magnetic field sensor, the spike voltage acquisition and processing module is connected to the AC power grid conducted emission device through a 50 Hz filtering module, and the input end of the AC / DC current acquisition and processing module is connected to the AC power grid conducted emission device and the DC power grid conducted emission device.

[0005] Preferably, the magnetic field sensor is a toroidal magnetic field antenna, which includes a toroidal copper tube. The outer shell is sleeved at the lower end of the toroidal copper tube, and a magnetic field connector is provided on the outer shell. An enameled wire is wound inside the toroidal copper tube, and the enameled wire is concentrically arranged with the toroidal copper tube.

[0006] Preferably, the DC power grid conduction emission device includes four chambers, which are, from left to right, the input terminal wiring area, the power grid conduction measurement functional area, the DC power grid filtering functional area, and the output terminal wiring area. The power grid conduction measurement functional area includes a current probe and a DC connector, and the current probe and the DC connector are connected by a radio frequency coaxial cable. The DC power grid filtering functional area includes capacitor one, capacitor two, and a discharge resistor. Capacitor one and capacitor two are connected in series, and the discharge resistor is connected in parallel with capacitor one and capacitor two.

[0007] Preferably, the 50Hz filtering module is a multi-stage LC high-pass filter with a high-voltage attenuation circuit.

[0008] The beneficial effects of the present utility model are as follows: The electromagnetic information acquisition and filtering device collects the electric field interference intensity, magnetic field interference intensity, AC power grid conduction interference and spike interference intensity, and DC power grid conduction interference intensity in the space through the electric field sensor, magnetic field sensor, AC power grid conduction emission device, and DC power grid conduction emission device. The data acquisition and processing unit processes the collected interference intensity and transmits it to the industrial control computer through Ethernet. The electromagnetic environment detection software is used to display and record the data in real time, and the data can be queried through the log at the same time. By analyzing the collected interference data and the recorded data, the reasons for the electromagnetic environment interference are analyzed, providing data support for better taking targeted electromagnetic interference solution measures. Description of the Drawings

[0009] Figure 1 The hardware structure block diagram of the present utility model.

[0010] Figure 2 The schematic structural diagram of the data acquisition and processing unit related to the present utility model.

[0011] Figure 3 The schematic structural diagram of the electric field sensor related to the present utility model.

[0012] Figure 4 The schematic structural diagram of the magnetic field sensor related to the present utility model.

[0013] Figure 5 The schematic structural diagram of the AC power grid conduction emission and spike pulse acquisition device related to the present utility model.

[0014] Figure 6 The schematic structural diagram of the DC power grid conduction emission measurement device related to the present utility model.

[0015] Figure 7 The schematic circuit structure diagram of the DC power grid conduction emission measurement device related to the present utility model.

[0016] Description of the reference numerals in the drawings: 1. Data acquisition and processing unit; 11. Main control module; 12. Input end of the electric field acquisition and processing module; 13. Input end of the magnetic field acquisition and processing module; 14. Input end; 15. AC input end; 16. DC input end; 17. 50Hz filtering module; 2. Electric field sensor; 21. Electric field connector; 3. Magnetic field sensor; 31. Magnetic field connector; 32. Annular copper tube; 33. Outer shell; 4. AC power grid conducted emission device; 41. Output end one; 42. Output end two; 5. DC power grid conducted emission device; 51. DC connector; 52. Current probe; 53. Capacitor one; 54. Capacitor two; 55. Bleeder resistor. Detailed implementation manners

[0017] The present utility model will be further described in detail below in conjunction with the drawings and the detailed implementation manners. The embodiments of the present utility model are given for the purpose of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

[0018] As shown in the figure, an electromagnetic information acquisition and filtering device includes a data acquisition and processing unit 1. The data acquisition and processing unit 1 includes a main control module 11. The output end of the main control module 11 is connected to the electromagnetic environment detection software platform through Ethernet. The input end of the main control module 11 is connected to the output ends of an electric field acquisition and processing module, a magnetic field acquisition and processing module, a peak voltage acquisition and processing module, and an AC / DC current acquisition and processing module. The corresponding input ends of the electric field acquisition and processing module, the magnetic field acquisition and processing module, the peak voltage acquisition and processing module, and the AC / DC current acquisition and processing module are all arranged on the outer shell of the data acquisition and processing unit 1, which are respectively the input end 12 of the electric field acquisition and processing module, the input end 13 of the magnetic field acquisition and processing module, the input end of the peak voltage acquisition and processing module is connected to the 50Hz filtering module 17 and then is the input end 14 on the outer shell of the data acquisition and processing unit 1, the input end of the AC / DC current acquisition and processing module is the AC input end 15 and the DC input end 16. The input end 12 of the electric field acquisition and processing module is connected to the electric field sensor 2, the input end 13 of the magnetic field acquisition and processing module is connected to the magnetic field sensor 3, the input end 14 is connected to the AC power grid conducted emission device 4, the AC input end 15 is connected to the AC power grid conducted emission device 4, and the DC input end 16 is connected to the DC power grid conducted emission device 5.

[0019] As Figure 3Shown is the electric field sensor 2. The electric field sensor 2 is used to collect the electric field interference intensity in the surrounding space and transmit the collected data to the data acquisition and processing unit 1. After data processing, the electric field interference data can be displayed on the industrial control computer. The electric field sensor 2 is connected to the input end 12 of the electric field acquisition and processing module through the electric field connector 21. Fixing parts are provided at the four corners of the electric field sensor 2 for fixing the electric field sensor 2.

[0020] As Figure 4 Shown is the magnetic field sensor 3. The magnetic field sensor 3 is used to collect the magnetic field interference intensity in the surrounding space and transmit the collected data to the data acquisition and processing unit. After data processing, the magnetic field interference data can be displayed on the industrial control computer. The magnetic field sensor 3 is a ring-shaped magnetic field antenna. The magnetic field sensor 3 is connected to the input end 13 of the magnetic field acquisition and processing module through the magnetic field connector 31. The magnetic field sensor 3 includes a ring-shaped copper tube 32. The outer shell 33 is sleeved at the lower end of the ring-shaped copper tube 32. The magnetic field connector 31 is located at the center of the outer shell 33. An enameled wire is wound inside the ring-shaped copper tube 32, and the enameled wire is concentric with the ring-shaped copper tube 32.

[0021] As Figure 5 Shown is the AC power grid conducted emission device 4. The AC power grid conducted emission device 4 is used to collect the conducted interference and spike interference intensities on the AC power grid and transmit the collected data to the data acquisition and processing unit. After data processing, the conducted interference and spike interference data on the AC power grid can be displayed on the industrial control computer. The two output ends of the AC power grid conducted emission device 4 are respectively the output end one 41 and the output end two 42. The output end one 41 is connected to the spike voltage acquisition and processing module through the 50Hz filtering module 17, that is, the output end one 41 is connected to the input end 14; the output end two 42 is connected to the AC input end 15.

[0022] As Figure 6 Shown is the DC power grid conducted emission device 5. The DC power grid conducted emission device 5 is used to collect the conducted interference on the DC power grid and transmit the collected data to the data acquisition and processing unit. After data processing, the conducted interference data on the DC power grid can be displayed on the industrial control computer. A DC connector 51 is provided on the DC power grid conducted emission device 5. The DC connector 51 is connected to the DC input end 16. The DC power grid conducted emission device 5 includes four chambers, which are, from left to right, the input terminal wiring area, the power grid conduction measurement function area, the DC power grid filtering function area, and the output terminal wiring area. The power grid conduction measurement function area includes a current probe 52 and the DC connector 51. The current probe 52 and the DC connector 51 are connected through a radio frequency coaxial cable; the DC power grid filtering function area includes a capacitor one 53, a capacitor two 54, and a discharge resistor 55. The capacitor one 53 and the capacitor two 54 are connected in series, and the discharge resistor 55 is connected in parallel with the capacitor one 53 and the capacitor two 54.

[0023] The 50Hz filter module 17 is a multi-stage LC high-pass filter with a high-voltage attenuation circuit. The multi-stage high-pass filter can increase the attenuation slope of the low-frequency signal of the filter, increase the attenuation of the 50Hz AC signal, better filter out the 50Hz AC component, and does not attenuate the spike pulse signal. The high-voltage attenuation circuit is at the back end of the high-pass filter circuit, which plays a role in attenuating the spike voltage. The attenuation circuit attenuates the spike signal by 100 times, so that the maximum voltage of 1000V to the data acquisition board is not greater than 10V. Finally, the attenuation coefficient is corrected by the internal software. After the spike voltage input signal filters out the 50Hz AC signal through the multi-stage high-pass filter, it is sent to the signal conditioning circuit through the input buffer circuit; the signal conditioning circuit performs low-pass filtering and amplification on the input analog signal to make its amplitude meet the requirements of the input signal of the AD converter. The signal is sampled, quantized, and encoded by the AD converter, and then transformed into a digital signal and sent to the main control module 11 for temporary storage and arithmetic processing. The three-phase AC signal is processed by parallel synchronous sampling of three channels of AD and is processed by real-time arithmetic of the main control module 11 to complete the detection and determination of the inter-phase spike pulse signal.

[0024] The electromagnetic environment detection software platform receives, analyzes, and processes the electromagnetic environment status information, including electric field strength, magnetic field strength, conducted emission current, and spike pulse voltage; displays the electromagnetic environment status; has the function of parameter over-limit or abnormality reminder, and has the function of setting over-limit alarm parameters; provides the function of recording over-limit information and the main operation log of the operator, and provides the functions of querying and displaying log information.

Claims

1. An electromagnetic information collection and filtering device, characterized in that: The data acquisition and processing unit (1) comprises a main control module (11), the output end of the main control module (11) is connected to an electromagnetic environment detection software platform via Ethernet, the input end of the main control module (11) is connected to an electric field acquisition and processing module, a magnetic field acquisition and processing module, a peak voltage acquisition and processing module and an AC / DC current acquisition and processing module, the electric field acquisition and processing module is connected to an electric field sensor (2), the magnetic field acquisition and processing module is connected to a magnetic field sensor (3), the peak voltage acquisition and processing module is connected to an AC power grid conduction and emission device (4) via a 50 Hz filter module (17), and the input end of the AC / DC current acquisition and processing module is connected to the AC power grid conduction and emission device (4) and the DC power grid conduction and emission device (5).

2. The electromagnetic information collection and filtering device according to claim 1, characterized in that: The magnetic field sensor (3) is a ring-shaped magnetic field antenna, comprising a ring-shaped copper tube (32), a housing (33) sleeved on the lower end of the ring-shaped copper tube (32), a magnetic field connector (31) provided on the housing (33), an enameled wire surrounding the inside of the ring-shaped copper tube (32), and the enameled wire and the ring-shaped copper tube (32) being arranged cocentrically.

3. The electromagnetic information collection and filtering device according to claim 1, characterized in that: The DC grid conduction and transmission device (5) includes four chambers, which are, from left to right, an input terminal connection area, a grid conduction measurement functional area, a DC grid filtering functional area and an output terminal connection area. The grid conduction measurement functional area includes a current probe (52) and a DC connector (51), and the current probe (52) and the DC connector (51) are connected via a radio frequency coaxial cable; the DC grid filtering functional area includes a capacitor 1 (53), a capacitor 2 (54) and a discharge resistor (55), the capacitor 1 (53) and the capacitor 2 (54) are connected in series, and the discharge resistor (55) is connected in parallel with the capacitor 1 (53) and the capacitor 2 (54).

4. The electromagnetic information collection and filtering device according to claim 3, characterized in that: The 50 Hz filter module (17) is a multi-stage LC high-pass filter including a high-voltage attenuation circuit.

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