Anti-interference leakage current detection device

Abstract

The utility model discloses an anti -interference leakage current detection device, including leakage current detection instrument, BNC adapter plate, relay board, connector adapter plate and control panel, wherein, leakage current detection instrument is used for gathering leakage current data, BNC adapter plate connects leakage current detection instrument, is used for with 1 way BNC divides into multichannel BNC, relay board connects BNC adapter plate and connector adapter plate, is used for controlling the multichannel BNC output of BNC adapter plate to connector adapter plate, the conversion between multichannel BNC and serial port for connector adapter plate, and serial port is used for connecting the product of measuring, and control panel connects relay board, and can according to the each pass switch of relay board of external host computer control signal control, realizes the combination of multiple pass. The utility model discloses through realizing the signal free combination of each pass, effectively weakens the influence of electromagnetic interference signal to the detection process, avoids the deviation of detection result due to interference.

Description

Technical Field

[0001] This invention proposes a detection device, and more particularly an anti-interference leakage current detection device. Background Technology

[0002] With the continued expansion of the medical and automotive industries, the use of cable wires in manufacturing has also increased significantly. After the welding process, leakage current testing becomes an indispensable quality control step. However, current leakage current detection systems have significant shortcomings: facing complex and variable electromagnetic environments, the detection systems have weak anti-interference capabilities and are highly susceptible to various electromagnetic interference signals, leading to distorted test data and frequent misjudgments. These defects severely restrict the application effectiveness of existing leakage current detection systems in actual production and fail to provide a reliable barrier for the safe and stable operation of power systems. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide an anti-interference leakage current detection device.

[0004] To achieve the above objectives, the anti-interference leakage current detection device provided by this utility model includes a leakage current detection instrument, a BNC adapter board, a relay board, a connector adapter board, and a control board: wherein, The leakage current detection instrument is used to detect leakage current data; The BNC adapter board is connected to the leakage current detection instrument and is used to divide one BNC into multiple BNCs. The relay board connects the BNC adapter board and the connector adapter board, and is used to control the multiple BNC outputs of the BNC adapter board to the connector adapter board; The connector adapter board is used for conversion between multiple BNC and serial ports, and the serial port is used to connect the product under test. The control board is connected to the relay board and can control the switching of each channel of the relay board according to the external host computer control signal, so as to realize the combination of multiple channels.

[0005] Furthermore, the relay board is provided with a metal shielding cover.

[0006] Furthermore, the relay on the relay board is model 9002-05-11, and some of the relay's pins are connected to the metal shield.

[0007] Furthermore, the relay board and the connector adapter board are connected via a low-noise BNC coaxial cable.

[0008] Furthermore, the low-noise BNC coaxial cable has an impedance of 50Ω, uses high-purity oxygen-free copper as the conductor, has an outer diameter of 1.6mm, an attenuation rate of ≤2.6dB / m, and a noise suppression ratio of ≥80dB.

[0009] Furthermore, the connector adapter plate is provided with a metal shield.

[0010] Furthermore, the connector adapter board has pins for connecting the metal shielding cover to the multi-channel BNC and serial port.

[0011] Furthermore, the anti-interference leakage current detection device is also provided with a metal housing; wherein the metal housing includes a first space and a second space separated from the first space; wherein the BNC adapter board, the relay board, and the connector adapter board are disposed in the first space of the metal housing, and the second space is used to place the product under test.

[0012] Furthermore, the control board includes a manual input port and an automatic input port, and the control board communicates with the host computer through the automatic input port.

[0013] Furthermore, the anti-interference leakage current detection device includes a power supply module, which provides power to the control board and provides level signals to the relay board through the control board.

[0014] The anti-interference leakage current detection device provided by this utility model optimizes the circuit layout. It uses a BNC adapter board to divide the BNC signal into multiple paths and uses relays to control each path of the signal separately. The connector adapter board converts the multiple BNC signals into serial port signals, and then transmits command signals to the relay board through the control board. The signals of multiple channels can be freely combined, which effectively reduces the influence of electromagnetic interference signals on the detection process and avoids deviations in the detection results due to interference. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-interference leakage current detection device provided by this utility model;

[0016] Figure 2 This is a circuit diagram of a relay in one embodiment of the present invention;

[0017] Figure 3 This is a circuit diagram of the connector adapter board in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the metal shell in one embodiment of the present invention. Detailed Implementation

[0019] like Figure 1As shown, this utility model provides an anti-interference leakage current detection device, including a leakage current detection instrument 11, a BNC adapter board 12, a relay board 13, a connector adapter board 14, and a control board 15.

[0020] The leakage current detection instrument 11 employs a high-precision leakage current detector. As the data acquisition source, it can accurately capture current signals, providing reliable raw data for subsequent detection and analysis, ensuring the accuracy and effectiveness of data acquisition. Its testing accuracy is extremely high, capable of accurately capturing leakage current data at the pA level. For example... Figure 2 As shown in one embodiment of this utility model, the leakage current detection instrument 11 uses a Hioki SM7110 high-resistance meter. Of course, other models of instruments can also be selected, and there is no limitation here.

[0021] The BNC adapter board 12 connects to the leakage current detection instrument 11 and is used to divide one BNC channel into multiple BNC channels. For example, 1 to 4 or 1 to 5. By increasing the number of channels, it is convenient for relays to control each channel individually.

[0022] Relay board 13 connects BNC adapter board 12 and connector adapter board 14, and is used to control the multiple BNC outputs of BNC adapter board 12 to connector adapter board 14. Furthermore, to further enhance anti-interference capabilities, the relays on relay board 13 preferably use model number 9002-05-11. These relays are equipped with metal shielding to effectively suppress electromagnetic interference. Their insulation resistance is as high as 10¹²Ω (1000GΩ), ensuring reliable signal isolation. The coil drive power consumption is ≤0.36W, supporting long-term stable operation with shielding. Figure 2 The circuit diagram of the relay shown is as follows: pins 1 and 4 are control terminals, pin 2 is a signal terminal, pin 3 is connected to ground, and pins 5 and 6 are cable shield terminals, which are connected to a metal shield. The metal shield is grounded to suppress electromagnetic interference (EMI).

[0023] Connector adapter board 14 is used for conversion between multiple BNC and serial ports, with the serial port used to connect the product under test. Connector adapter board 14 also has a metal shielding cover, which is fixed to the connector adapter board 14 by a snap-fit ​​mechanism. For example... Figure 3 The circuit diagram of the converter connection board shown illustrates a flexible combination of 10 channels via a serial port. Pins 1 to 4 of each BNC signal (U1~U10) are connected to a metal shielding layer between themselves and the input of the serial port chip. The USB chip of the serial port also has pins (13 and 14) for connecting to the metal shielding layer. A Type-C interface is preferred for the serial port. This invention achieves flexible combination of 10 channels via a serial port. This design effectively reduces the impact of electromagnetic interference signals on the detection process, avoiding deviations in detection results due to interference.

[0024] Furthermore, the relay board 13 and the connector adapter board 14 are connected via a low-noise BNC coaxial cable. The low-noise BNC coaxial cable has an impedance of 50Ω, uses high-purity oxygen-free copper as the conductor, has an outer diameter of 1.6mm, an attenuation rate of ≤2.6dB / meter, and a noise suppression ratio of ≥80dB, effectively reducing the impact of environmental electromagnetic interference on weak signals. It complies with the MIL-C-17G military specification standard and is suitable for an operating temperature range of -40℃ to +85℃.

[0025] The control board 15 is connected to the relay board 13 and controls the switching of various channels of the relay board 13 according to the external host computer control signals, realizing the combination of multiple channels. The control board 15 includes a manual input port and an automatic input port. The automatic input port of the control board 15 communicates with the host computer through the communication module 16. The communication module uses an RS485 chip, enabling RS485 communication between the control board 15 and the host computer.

[0026] Furthermore, the anti-interference leakage current detection device includes a power supply module 17, which provides a 12V power supply to the control board 15 and provides a 5V level signal to the relay board 13 through the control board 15.

[0027] like Figure 4 As shown, the anti-interference leakage current detection device of this utility model also has a metal shell; wherein, the metal shell includes a first space 17 and a second space 18 separated from the first space 17; wherein, the BNC adapter board 12, the relay board 13, and the connector adapter board 14 are disposed in the first space 17 of the metal shell, and the second space 18 is used to place the product to be tested. The first space 17 is cuboid in shape and has a door at the top, which can be used to open and close the first space 17. The second space 18 is adjacent to the first space 17, and its side is roughly triangular, presenting a side-opening door, which facilitates the placement and removal of the product. Other components, such as the control board 15, the power supply, and the leakage current detection instrument 11, are located outside the metal shell, so that the transmission path inside the metal shell is not affected by external components. The metal shell is made of a high-conductivity, high-strength alloy material and is precision machined. Each side of the device is grounded to ensure effective grounding, achieve effective shielding against electromagnetic interference, and improve the stability and safety of the device during use.

[0028] Based on the above, the novel anti-interference leakage current detection device provided by this utility model has the following advantages: it can achieve flexible combination of 10 channels through a serial port, effectively reducing the influence of electromagnetic interference signals on the detection process and avoiding deviations in detection results due to interference. By selecting electronic components and optimizing the circuit layout, it achieves preliminary suppression of external electromagnetic interference, efficiently filters out various interference signals, and makes the data to be processed highly pure. In terms of channel control and signal transmission, the external control board accurately transmits command signals to the internal relay board of the device, realizing the function of free combination of channels; the metal shell is reliably grounded, further enhancing the electromagnetic shielding effect and ensuring stable signal transmission, thereby significantly improving the accuracy and reliability of leakage current detection.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. An anti-interference leakage current detection device, characterized in that, This includes leakage current detection instruments, BNC adapter boards, relay boards, connector adapter boards, and control boards: among which, The leakage current detection instrument is used to detect leakage current data; The BNC adapter board is connected to the leakage current detection instrument and is used to divide one BNC into multiple BNCs. The relay board connects the BNC adapter board and the connector adapter board, and is used to control the multiple BNC outputs of the BNC adapter board to the connector adapter board; The connector adapter board is used for conversion between multiple BNC and serial ports, and the serial port is used to connect the product under test. The control board is connected to the relay board and is used to control the switching of each channel of the relay board according to the external host computer control signal, so as to realize the combination of multiple channels.

2. The anti-interference leakage current detection device according to claim 1, characterized in that, The relay board is equipped with a metal shielding cover.

3. The anti-interference leakage current detection device according to claim 2, characterized in that, The relay on the relay board is model 9002-05-11, and some of the relay's pins are connected to the metal shield.

4. The anti-interference leakage current detection device according to claim 1, characterized in that, The relay board and the connector adapter board are connected by a low-noise BNC coaxial cable.

5. The anti-interference leakage current detection device according to claim 4, characterized in that, The low-noise BNC coaxial cable has an impedance of 50Ω, uses high-purity oxygen-free copper as the conductor, has an outer diameter of 1.6mm, an attenuation rate of ≤2.6dB / meter, and a noise suppression ratio of ≥80dB.

6. The anti-interference leakage current detection device according to claim 1, characterized in that, The connector adapter board is equipped with a metal shield.

7. The anti-interference leakage current detection device according to claim 6, characterized in that, The connector adapter board has pins for connecting the metal shielding cover to the multi-channel BNC and serial port.

8. The anti-interference leakage current detection device according to claim 1, characterized in that, The anti-interference leakage current detection device is further provided with a metal housing; wherein, the metal housing includes a first space and a second space separated from the first space; wherein, the BNC adapter board, the relay board, and the connector adapter board are disposed in the first space of the metal housing, and the second space is used to place the product under test.

9. The anti-interference leakage current detection device according to claim 1, characterized in that, The control board includes a manual input port and an automatic input port, and the control board communicates with the host computer through the automatic input port.

10. The anti-interference leakage current detection device according to claim 1, characterized in that, The anti-interference leakage current detection device includes a power supply module, which provides power to the control board and provides level signals to the relay board through the control board.

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