An insulation detection device based on matrix switching

Abstract

This invention discloses an insulation testing device based on matrix switching, comprising a host controller, an insulation testing unit, and a line switching matrix unit. The host controller is used to edit and issue testing tasks and receive testing results. The insulation testing unit is used to output rated voltage, quantify and collect data from the connected testing lines, and report the testing results. The insulation testing unit is equipped with a high-voltage output terminal, sampling points, and a control bus. The line switching matrix unit completes control information decoding, high-voltage distribution, and connects the line under test to the sampling point of the insulation resistance testing unit. It controls a relay matrix to distribute high voltage to the electrically connected high-voltage output terminal and controls the insulation testing unit to complete the insulation test function through the control bus. The host controller is electrically connected to the line switching matrix unit through a GPIO interface and to the insulation resistance testing unit through a CAN interface, which can achieve the beneficial effects of automatic detection and improved detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of insulation resistance testing technology, and in particular to an insulation testing device based on matrix switching. Background Technology

[0002] Various types of cables are widely used in aircraft, primarily for short-distance power transmission and the transmission of various control signals. Due to the harsh operating environment, cables are inevitably susceptible to various failures during use due to factors such as ablation, corrosion, humidity, high and low temperatures, vibration, and friction. Insulation testing devices, as important testing instruments, are widely used in various fields such as aviation, aerospace, and military industries.

[0003] In existing technologies, manual testing of cable performance is technically challenging, time-consuming, environmentally restrictive, computationally complex, and requires manual recording. As a result, the accuracy and evaluation conclusions of the tests largely depend on the technical level and experience of the testing personnel, leading to a lack of objectivity, timeliness, and accuracy in the final test results.

[0004] Patent No. "201710403902.3" entitled "An Insulation Resistance Detection System" discloses a technology that uses a voltage sampling circuit to transmit the collected voltage value to the host computer in real time via a microprocessor, and promptly reports any degradation in the device's insulation performance to ground to the host computer. The problem with this existing technology is:

[0005] 1) Unable to automatically switch to multi-channel testing, especially insulation testing of multiple wire harnesses;

[0006] 2) A single high-voltage circuit cannot be used for multi-circuit testing;

[0007] 3) It is impossible to improve testing efficiency through planning and design; Summary of the Invention

[0008] To address the aforementioned problems, this invention proposes an insulation detection device based on rectangular switching to overcome the shortcomings of existing technologies.

[0009] The technical solution adopted in this invention is:

[0010] An insulation detection device based on matrix switching includes a host controller, an insulation detection unit, and a line switching matrix unit.

[0011] The host computer is used to edit and issue detection tasks and receive detection results;

[0012] The insulation detection unit is used to output the rated voltage, perform quantitative data acquisition on the line under test, and report the test results. The insulation detection unit is equipped with a high-voltage output terminal, sampling points, and a control bus.

[0013] The line switching matrix unit is used to complete the functions of decoding control information, high voltage distribution, connecting the line under test to the sampling point through the relay matrix, controlling the relay matrix to distribute high voltage to the electrically connected high voltage output terminal, and controlling the insulation detection unit to complete the insulation test through the control bus.

[0014] The host controller is electrically connected to the line switching matrix unit via the GPIO interface and to the insulation detection unit via the CAN interface.

[0015] Furthermore, the line switching matrix unit includes a decoding board, a high-voltage distribution board, a set of first relay boards, and a set of second relay boards. The decoding board receives GPIO signals, which are then decoded by the decoding board and transmitted to the control bus of the high-voltage distribution board, the first relay board, the second relay board, and the insulation detection unit. The high-voltage output terminal of the insulation detection unit is electrically connected to a first relay board after being selected by the high-voltage distribution board, and the sampling point of the insulation detection unit is electrically connected to a set of second relay boards.

[0016] Furthermore, the decoding board includes a first relay array, a first power drive circuit, a first decoding circuit, and a second decoding circuit. The GPIO signals are functionally divided into a first output, a second output, a third output, a fourth output, and an enable output. The first output controls one end of the electromagnet of the first relay array through the first power drive circuit, and the other end of the electromagnet is electrically connected to +5V. The normally open terminals of the first relay array are electrically connected to the control bus of the corresponding insulation detection unit. The second output outputs a first decoding signal to the high-voltage distribution board through the first decoding circuit. The third output outputs a second decoding signal to the second relay board through the second decoding circuit. The fourth output is electrically connected to the first relay board. The enable output controls the enable terminals of the first power drive circuit, the first decoding circuit, and the second decoding circuit through a NOT gate.

[0017] Furthermore, the first power drive circuit includes a first AND gate and a first power control chip. The first AND gate is configured as a two-input AND gate group. One input terminal of each two-input AND gate is electrically connected to the first output, and the other input terminal is connected in parallel to serve as the enable terminal of the first power drive circuit.

[0018] Furthermore, the high-voltage distribution board includes a second relay array and a second power drive circuit. The high-voltage distribution board receives the first decoding signal from the decoding board and connects one end of the electromagnet of the second relay array to the second relay array electromagnet via the second power drive circuit. The other end of the electromagnet of the second relay array is connected to +5V. The normally open terminals of the second relay array are connected to the first relay board. The common terminal of the second relay array is connected in parallel and then connected to the high-voltage output terminal of the insulation detection unit.

[0019] Furthermore, the second power drive circuit includes a NOT gate group, a two-input AND gate, and a power drive chip. The first decoded signal is respectively passed through two NOT gates to the two-input AND gate. The output of the two-input AND gate is sent to the power drive chip. The output of the power drive chip is respectively electrically connected to one end of the electromagnet of the second relay array.

[0020] Furthermore, the first relay board includes a decoding circuit assembly, a normally open relay array, and a power drive circuit assembly. The first relay board receives a fourth output and is electrically connected to the corresponding power drive circuit assembly through the decoding circuit assembly. The power drive circuit assembly is electrically connected to one end of the normally open relay array electromagnet, and the other end of the normally open relay array electromagnet is electrically connected to +5V. The normally open terminals of the normally open relay array are electrically connected to the test interface, and the common terminal of the normally open relay array is connected in parallel to the normally open terminal of one of the relays in the second relay array.

[0021] Furthermore, the second relay board includes a normally closed relay array, the normally closed terminals of the normally closed relay array are electrically connected to the test interface, and the common terminals of the normally closed relays are connected in parallel and then electrically connected to the sampling point of the insulation detection unit.

[0022] Furthermore, the number of relays in the second relay array is set to 4, the decoder of the decoding circuit combination is set to 2, the driver of the power drive circuit combination is set to 4, and the number of relays in the normally open relay array and the normally closed relay array is 32.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The use of layered relay control can achieve a maximum of 128 measurement acquisition channels, which effectively improves detection efficiency and reduces the terminal connection process during measurement.

[0025] 2) The host controller adopts a GPIO control matrix switching unit, which is convenient and flexible, and improves the flexibility of the host controller.

[0026] 3) Integrating the insulation detection unit and the matrix switching unit together improves the integration of the equipment and reduces external interfaces.

[0027] 4) It adopts a set of normally open relay arrays, a set of normally closed relay arrays, and decoding circuits, which has a high degree of integration. It controls a large relay array with very few control terminals and automatically completes the testing of multiple cables at one time. Through the line switching matrix, it can expand the original single-cable testing to a multiple extent and automatically execute the system's automated testing process, making the testing process simpler and more efficient. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an insulation detection device based on matrix switching according to the present invention;

[0030] Figure 2 This is a circuit diagram of the decoding board in this invention;

[0031] Figure 3 This is a circuit diagram of the high-voltage distribution board in this invention;

[0032] Figure 4 , Figure 5 This is a circuit diagram of the first relay board in this invention;

[0033] Figure 6 This is a schematic diagram of insulation testing. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that similar labels 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.

[0037] In the description of this invention, it should be noted that the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 invention based on the specific circumstances.

[0039] Reference Figures 1-6 As shown, the present invention specifically discloses an insulation detection device based on matrix switching, including a host controller, an insulation detection unit, and a line switching matrix unit;

[0040] The host computer is used to edit and issue detection tasks and receive detection results;

[0041] The insulation detection unit is used to output the rated voltage, perform quantitative data acquisition on the connected detection line, and report the detection results. The insulation detection unit is equipped with a high-voltage output terminal, sampling points, and a control bus.

[0042] The line switching matrix unit is used to complete the functions of decoding control information, high voltage distribution, connecting the line under test to the sampling point through the relay matrix, controlling the relay matrix to distribute the high voltage to the electrically connected high voltage output terminal, and controlling the insulation detection unit to complete the insulation test through the control bus.

[0043] The rated output voltage of the insulation detection unit is 500V; the measurement range is 0.0MΩ~5GΩ; the open circuit voltage is DC500V+20%,-0%; the rated current is 1mA~1.2mA under a 500KΩ load; the short circuit current is less than 2.0mA; the accuracy is 0.0MΩ~100MΩ:±(3%+5) and 100MΩ~5GΩ:±(5%+5).

[0044] The host computer performs sampling control by connecting the line switching matrix unit via GPIO and collecting sampling results by connecting the insulation detection unit via CAN interface. The host computer uses a general-purpose computer or laptop computer with sampling and control software designed as needed.

[0045] Preferably, the line switching matrix unit includes a decoding board such as Figure 2 High-voltage distribution board, such as Figure 3 , one Group 1 Relay Board (Only one relay board is shown, e.g.) Figure 4 ,like Figure 5 A set of second relay boards (similar to the first relay board, not shown) are provided. The host controller is electrically connected to the decoder board via a GPIO interface. The decoder board receives GPIO signals. The GPIO signals are decoded by the decoder board and then transmitted to the control bus of the high-voltage distribution board, the first relay board, the second relay board, and the insulation detection unit. The high-voltage output terminal of the insulation detection unit is selected by the high-voltage distribution board and then electrically connected to a first relay board. The sampling point of the insulation detection unit is electrically connected to a set of second relay boards. Here, the high-voltage output of the insulation detection unit is selected from four and output to a certain first relay board through the high-voltage distribution board.

[0046] Preferably, Figure 2 The decoding board shown includes a first relay array (RL1, RL3, RL2, RL4), a first power drive circuit, a first decoding circuit, and a second decoding circuit. The GPIO signals are functionally divided into a first output, a second output, a third output, a fourth output, and an enable output. The first output controls one end of the electromagnet in the first relay array (RL1, RL3, RL2, RL4) via the first power drive circuit. The other end of the electromagnet is electrically connected to +5V. The normally open terminals are electrically connected to the control buses (J12-J15) of the corresponding insulation detection units to control the insulation detection units. The second output outputs the first decoded signal (J2, J3, J6, J7) to the high-voltage distribution board through the first decoding circuit. The third output outputs the second decoded signal to the second relay board (J8-J11) through the second decoding circuit. The fourth output is electrically connected to the first relay board (J5). The enable output controls the enable terminals of the first power drive circuit U4, the first decoding circuit U2, and the second decoding circuit U3 through the NOT gate U1:A.

[0047] Preferably, the first power drive circuit includes a first AND gate (U5) and a first power control chip (U4). The first AND gate U5 is configured as a two-input AND gate group. One input terminal of each two-input AND gate is electrically connected to the first output, and the other input terminal is connected in parallel to serve as the enable terminal of the first power drive circuit.

[0048] Preferably, Figure 3As shown, the high-voltage distribution board includes a second relay array (RL1, RL3, RL2, RL4) and a second power drive circuit. The high-voltage distribution board receives the first decoding signal (J2, J3, J6, J7) from the decoding board and connects one end of the electromagnet of the second relay array to the second relay array electromagnet via the second power drive circuit. The other end of the electromagnet of the second relay array is connected to +5V. In this application, there are four first relay boards. The normally open terminals (GY1, GY2, GY3, GY4) of the second relay array (RL1, RL3, RL2, RL4) are connected to the first relay boards, i.e., they are connected to the four first relay boards respectively. The common terminal of the second relay array is connected in parallel, and GY is connected to the high-voltage output terminal of the insulation detection unit. The normally closed terminal of the second relay array is connected to 5V.

[0049] Preferably, the second power drive circuit includes a NOT gate group (U1), a two-input AND gate (U5), and a power drive chip (U4). The high-voltage distribution board receives the first decoding signal (J2, J3, J6, J7) from the decoding board. The first decoding signal passes through two NOT gates to the two-input AND gate. The output of the two-input AND gate is sent to the power drive chip. The output of the power drive chip is electrically connected to one end of the electromagnet of the second relay array.

[0050] Preferably, Figure 4 , Figure 5 The first relay board includes a decoder circuit assembly (U1, U5), a normally open relay array (RL2, RL4, RL6, RL8, RL10, RL12, RL14, RL16... only a part is shown here, the others are similar), and a power drive circuit assembly (U3, only a part is shown here, the others are similar). The first relay board receives a fourth output (J1, J2) and outputs 32 control signals through the decoder circuit assembly (U1, U5), which are electrically connected to the power drive circuit assembly (U3, U7). The power drive circuit assembly drives 32 relays respectively. Only the control process of 8 relays (J1) is shown here, the others are similar. The power drive circuit assembly is electrically connected to one end of the electromagnet of the normally open relay array (RL2, RL4, RL6, RL8, RL10, RL12, RL14, RL16), and the other end of the electromagnet of the normally open relay array is electrically connected to +5V. The normally open terminals of the normally open relay array are electrically connected to the test interface (J1…), and the common terminal GY of the normally open relay array is connected in parallel and electrically connected to… Figure 3 The normally open terminal (J12, J13, J14, or J15) of one of the relays in the second relay array (RL1, RL3, RL2, RL4) can control the high voltage output to the high voltage cable through the normally open relay array, realizing 4*32=128 channels of high voltage selection control.

[0051] Preferably, the second relay board includes a normally closed relay array, the normally closed terminals of the normally closed relay array are electrically connected to the test interface, the common terminal of the normally closed relays is connected in parallel and electrically connected to the sampling point of the insulation detection unit, one end of the electromagnet of the normally closed relay is electrically connected to the decoding board, and the other end is connected to 5V.

[0052] The second relay array contains 4 relays, the decoding circuit combination has 2 decoders, the power drive circuit combination has 4 drivers, and the normally open relay array ( Figure 5 Only a portion of the circuit is shown; the other parts are... Figure 5 (Similarly), the number of relays in the normally closed relay array is 32.

[0053] The present invention discloses an insulation detection device based on matrix switching, the working principle of which is as follows:

[0054] The decoding board distributes the high-voltage output of the insulation detection unit to one of the first relay boards via the high-voltage distribution board. It then controls the relays on the first relay board to output high voltage to one of the selected test interfaces. The insulation resistance to be tested is set at the test interface, and the high voltage flows through the insulation resistance to be tested and is connected to the test point via the second relay board for testing.

[0055] An insulation resistance detection unit and a line switching matrix unit are integrated into an insulation detection device. The host computer communicates with the line switching matrix via GPIO. The high-voltage output of the insulation resistance detection unit is connected to the line switching matrix as its selection output. The cables under test are connected to the extended output ports of the line switching matrix.

[0056] The testing personnel can operate and control the insulation testing device through the host computer human-machine interaction software to complete insulation testing and data recording. This device can control 128 testing channels and continuously test up to 128 cables under test. The human-machine interaction software can display and store the test data.

[0057] The insulation resistance detection unit is connected to the line switching matrix, which can expand the high voltage output channel. The test device can be switched by disconnecting the line switching matrix, so as to enable continuous automatic execution.

[0058] When testing is required, simply connect the cable to be tested. The software will read the imported process sheet, automatically select the matrix box connection, and send the command to the insulation resistance tester. The software interface will then display the test results. Once the test is complete, it will automatically switch to the next cable to be tested. This eliminates the need for manual plugging and unplugging and switching of cables, achieving automated testing.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. An insulation detection device based on matrix switching, comprising a host controller, characterized in that: It also includes an insulation detection unit and a line switching matrix unit; The host controller is electrically connected to the line switching matrix unit via the GPIO interface and to the insulation detection unit via the CAN interface. It is used to edit and send out detection tasks and receive detection results. The insulation detection unit is equipped with a high-voltage output terminal, sampling points and a control bus, used to output the rated voltage, and to quantitatively collect data on the line under test connected to the line switching matrix unit and report the detection results. The line switching matrix unit is used to complete the functions of decoding control information, allocating high voltage, and controlling the insulation detection unit to complete insulation testing through the control bus. The line switching matrix unit includes a decoding board, a high-voltage distribution board, a set of first relay boards, and a set of second relay boards. The decoding board distributes the high-voltage output of the insulation detection unit to one of the first relay boards through the high-voltage distribution board. Furthermore, by controlling the relays on the first relay boards, the high voltage is output to the test interface of the corresponding relay on the selected first relay board. The insulation resistance of the line under test is set at the test interface, so the high voltage flows through the insulation resistance of the line under test and is connected to the sampling point of the insulation detection unit for testing through the second relay board.

2. The insulation detection device based on matrix switching according to claim 1, characterized in that, The decoding board receives GPIO signals, which are then decoded and transmitted to the control buses of the high-voltage distribution board, the first relay board, the second relay board, and the insulation detection unit. The high-voltage output terminal of the insulation detection unit is electrically connected to a first relay board after being selected by the high-voltage distribution board. The circuit under test is electrically connected to the sampling point of the insulation detection unit through a set of second relay boards.

3. The insulation detection device based on matrix switching according to claim 2, characterized in that, The decoding board includes a first relay array, a first power drive circuit, a first decoding circuit, and a second decoding circuit. The GPIO signals are functionally divided into a first output, a second output, a third output, a fourth output, and an enable output. The first output controls one end of the electromagnet of the first relay array through the first power drive circuit, and the other end of the electromagnet is electrically connected to +5V. The normally open terminals of the first relay array are electrically connected to the control bus of the corresponding insulation detection unit. The second output outputs a first decoding signal to the high-voltage distribution board through the first decoding circuit. The third output outputs a second decoding signal to the second relay board through the second decoding circuit. The fourth output is electrically connected to the first relay board. The enable output controls the enable terminals of the first power drive circuit, the first decoding circuit, and the second decoding circuit simultaneously through a NOT gate.

4. The insulation detection device based on matrix switching according to claim 3, characterized in that, The first power drive circuit includes a first AND gate and a first power control chip. The first AND gate is configured as a two-input AND gate group. One input terminal of each two-input AND gate is electrically connected to the first output, and the other input terminal is connected in parallel to serve as the enable terminal of the first power drive circuit. The output terminal of each two-input AND gate is connected to the input terminal of the first power control chip. The output terminal of the first power control chip is connected to one end of the first relay array electromagnet.

5. An insulation detection device based on matrix switching according to claim 4, characterized in that, The high-voltage distribution board includes a second relay array and a second power drive circuit. The high-voltage distribution board receives the first decoding signal from the decoding board and connects one end of the electromagnet of the second relay array to the second relay array electromagnet via the second power drive circuit. The other end of the electromagnet of the second relay array is connected to +5V. The normally open terminals of the second relay array are connected to the first relay board. The common terminal of the second relay array is connected in parallel and then connected to the high-voltage output terminal of the insulation detection unit.

6. An insulation detection device based on matrix switching according to claim 5, characterized in that, The second power drive circuit includes a NOT gate group, a two-input AND gate, and a power drive chip. The first decoded signal is passed through two NOT gates to the two-input AND gate. The output of the two-input AND gate is sent to the power drive chip. The output of the power drive chip is electrically connected to one end of the electromagnet of the second relay array.

7. An insulation detection device based on matrix switching according to claim 6, characterized in that, The first relay board includes a decoding circuit assembly, a normally open relay array, and a power drive circuit assembly. The first relay board receives a fourth output and is electrically connected to the corresponding power drive circuit assembly through the decoding circuit assembly. The power drive circuit assembly is electrically connected to one end of the electromagnet of the normally open relay array, and the other end of the electromagnet of the normally open relay array is electrically connected to +5V. The normally open terminals of the normally open relay array are electrically connected to the test interface, and the common terminal of the normally open relay array is connected in parallel to the normally open terminal of one of the relays in the second relay array.

8. An insulation detection device based on matrix switching according to claim 7, characterized in that, The second relay board includes a normally closed relay array. The normally closed terminals of the normally closed relay array are electrically connected to the test interface, and the common terminals of the normally closed relays are connected in parallel and then electrically connected to the sampling point of the insulation detection unit.

9. An insulation detection device based on matrix switching according to claim 8, characterized in that, The second relay array has 4 relays, the decoding circuit combination has 2 decoders, the power drive circuit combination has 4 drivers, and both the normally open relay array and the normally closed relay array have 32 relays.

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