A multi-channel line inspection apparatus and method

Abstract

The application provides a kind of multi-channel line inspection device and method, after device initialization, pass-on inspection signal is output by CPU control unit, pass-on loop is changed by display control circuit, voltage determination on-off condition is output sampling port corresponding to LED display array, LED displays current loop state, in line sequence inspection, consistency of CPU control unit port number and output sampling port is compared to determine, current loop state is displayed by LED.In floating inspection, AD floating sampling circuit port sampling voltage is compared with threshold voltage, and alarm unit prompts alarm to current loop when exceeding threshold voltage range.The application determines line floating inspection by voltage division sampling mode, with higher sensitivity, at the same time, the device can check line on-off, line sequence and line floating state at one time, improve line inspection efficiency and increase inspection accuracy.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of line state inspection, and particularly relates to a multi-channel line inspection device and method, which is suitable for single-time inspection of multiple projects of line conduction, line sequence and floating. BACKGROUND

[0002] At present, various electronic lines need to be inspected before installation, so as to ensure good operation of communication and power supply of devices at all levels after installation, including conduction inspection of connecting lines, correctness of line sequence, floating inspection and the like. The current line inspection experimental device is difficult to consider multiple forms of inspection, and the inspection method is single. In the production and manufacturing process, due to the large number of line joints, it is difficult to quickly and accurately complete the multi-project inspection of the on-off state of the wire harness, the line sequence and the terminal floating state at one time. The line detection method is complicated, the process is more, and the production efficiency is low. At the same time, the connecting cable is easy to cause the loosening of the terminal, the poor contact, the wear and breakage of the connecting cable, and the incorrect connection of the line sequence during installation on site. Due to the complicated test method, the line is easy to find problems, which affects the subsequent process.

[0003] Generally, the inspection method of line on-off is to confirm the conduction condition by connecting the line with a multimeter, and it is necessary to confirm one line by one line. The floating and line sequence inspection cannot be completed at one time, and the line sequence and floating confirmation need to be separately performed. For example, the utility model with the publication number CN202649365U can only perform line on-off inspection. In the inspection of line floating, for example, the invention with the publication number CN101629987A cannot determine the line sequence and line conduction condition, and the accuracy of line floating is not enough. SUMMARY

[0004] In order to solve the problem that the existing device cannot perform multi-project inspection of multiple line heads at one time, the present application provides a multi-channel line inspection device and method, which can complete multi-project inspection including line on-off inspection, line sequence inspection and line floating inspection at one time, and simplifies the operation steps of line inspection.

[0005] The technical scheme adopted by the present application to solve the technical problem is: a multi-channel line inspection device, comprising: a CPU control unit, a connection port, an LED display array, a display control circuit, a power supply unit, an alarm unit, an AD floating sampling circuit and a port sampling circuit; wherein the connection port comprises an IN connection port and an OUT connection port.

[0006] One end of the line to be detected is connected with the IN connection port, and the other end is connected with the OUT connection port; the IN connection port is connected with the display control circuit and the power supply unit, and the IN connection port is marked with a serial number; the display control circuit is connected with the CPU control unit, the power supply unit and the LED display array; the OUT connection port is connected with the LED display array, and the OUT connection port is marked with a serial number; the alarm unit is connected with the CPU control unit; the AD floating sampling circuit is connected with the CPU control unit and the LED display array, and the port sampling circuit is connected with the CPU control unit and the LED display array; the power supply unit is further connected with the CPU control unit, the LED display array, the alarm unit, the AD floating sampling circuit and the port sampling circuit respectively.

[0007] Further, the IN connection port and the OUT connection port adopt a composite wiring terminal.

[0008] Further, the display control circuit presents a high resistance state and a very small leakage current when it is not in action.

[0009] Further, the power supply unit is a rechargeable battery.

[0010] Further, the AD floating sampling circuit adopts a high-precision sampling chip resistor.

[0011] A multi-channel line inspection method using the above device is used to complete line on-off inspection, line sequence inspection and line floating inspection at a time;

[0012] The line on-off inspection: after the line to be detected is connected through the IN connection port and the OUT connection port, the device is powered on, the CPU control unit port outputs high level from low level in turn, and the display control circuit forms a path between the connection port 1-n and the LED display array in turn, and the line on-off is judged by the LED lighting condition, the LED lighting is the line conduction, at this time, the output sampling port of the port sampling circuit corresponding to the LED display array is high level, the LED extinguishing is the line disconnection, and the specific line is judged according to the serial number on the device;

[0013] The line sequence inspection: the CPU control unit processes the connection port 1-n in turn by the display control circuit, the LED display array extinguishes in turn, and the output sampling port corresponding to the LED display array should output low level; if the connection port pulled down by the display control circuit and the output sampling port are consistent and low level, it is indicated that the line sequence of the line to be detected is correct, and if they are inconsistent, it is indicated that the line sequence of the line to be detected is incorrect, the CPU control unit sends a signal to the alarm unit to alarm, and the LED display array displays the current problem position and lights up;

[0014] The line floating inspection: at this time, the LED display array is all in the light-out state, the CPU control unit port outputs a floating inspection signal, the AD floating sampling circuit port carries out voltage sampling, the CPU control unit compares the sampling voltage, if the AD floating sampling circuit port sampling voltage is obviously less than the set threshold, it is determined that the floating is, the CPU control unit sends a signal to the alarm unit, and the alarm unit alarms.

[0015] Further, the power supply unit provides two voltage, one is used for separately supplying power for the display control circuit and the LED display array, and the other is used for supplying power for other unit modules.

[0016] Further, the line on-off inspection, the line sequence inspection and the line floating inspection are not fixed in sequence, and one, two or three of them can be inspected.

[0017] The beneficial effects of the present application include: the operation steps of the line inspection are simplified, the line can be inspected in on-off, sequence and floating at one time and quickly. Meanwhile, the floating inspection method is innovatively proposed by the accurate sampling of the sampling resistor in the device, and the accuracy and reliability of the floating inspection are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall block diagram of the device of the present application;

[0019] Figure 2 It is the overall method flow chart of the present application;

[0020] Figure 3 It is the circuit principle diagram of the present application.

[0021] In the figure: 1, CPU control unit, 2, IN connection port, 3, OUT connection port, 4, LED display array, 5, display control circuit, 6, power supply unit, 7, alarm unit, 8, AD floating sampling circuit, 9, port sampling circuit;

[0022] 10, CPU control signal input port, 11, floating AD sampling port, 12, output sampling port, 13, display input end, 14, AD floating sampling output end, 15, control signal input end, 16, sampling signal output end. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] The application provides a multi-channel line inspection device and method Figure 1 The device comprises a CPU control unit 1, an IN connection port 2, an OUT connection port 3, an LED display array 4, a display control circuit 5, a power supply unit 6, an alarm unit 7, an AD floating sampling circuit 8, a port sampling circuit 9, and can perform multi-channel, multi-item, one-time and fast line on-off inspection, line sequence inspection and line floating inspection.

[0025] One end of the line to be detected is connected to the IN connection port 2, and the other end is connected to the OUT connection port 3; the IN connection port 2 and the OUT connection port 3 adopt a composite wiring terminal, which can meet various connection modes;

[0026] The IN connection port 2 is connected with the display control circuit 5 and the power supply unit 6, and the IN connection port 2 is marked with a sequence number;

[0027] The display control circuit 5 is connected with the CPU control unit 1, the power supply unit 6 and the LED display array 4, and is used for controlling the LED display array 4; the display control circuit 5 presents a high resistance state and a very small leakage current when not in action;

[0028] The OUT connection port 3 is connected with the LED display array 4, and the OUT connection port 3 is marked with a sequence number;

[0029] The alarm unit 7 is connected with the CPU control unit 1, and is used for prompting alarm; the alarm mode can be connected with a buzzer and other peripheral devices, and the alarm mode is not limited and is used for completing the prompting alarm function;

[0030] The AD floating sampling circuit 8 is connected with the CPU control unit 1 and the LED display array 4, and realizes floating condition judgment; the AD floating sampling circuit 8 adopts a high-precision sampling chip resistor, and judges the floating state through accurate sampling comparison;

[0031] The port sampling circuit 9 is connected with the CPU control unit 1 and the LED display array 4;

[0032] The power supply unit 6 also supplies power for the CPU control unit 1, the LED display array 4, the alarm unit 7, the AD floating sampling circuit 8 and the port sampling circuit 9 respectively; the power supply unit 6 is a rechargeable battery.

[0033] After the device is initialized, the on-off check signal is output by the CPU control unit 1, the on-off circuit is changed by the display control circuit 5, the sampling port voltage is output by the port sampling circuit 9 corresponding to the LED display array 4 to determine the on-off state, the LED displays the current circuit state, and the alarm unit 7 prompts the alarm for the current circuit when a problem occurs. In the line sequence check, the consistency of the port sequence number of the CPU control unit 1 and the sampling port of the port sampling circuit 9 is compared to determine, the current circuit state is displayed by the LED, and the alarm unit 7 prompts the alarm for the current circuit when a problem occurs. In the floating check, the port sampling voltage of the AD floating sampling circuit 8 is compared with the threshold voltage, and the alarm unit 7 prompts the alarm for the current circuit when the threshold voltage is exceeded. The present application determines the line floating check by the voltage division sampling mode, has higher sensitivity, at the same time, the device can check the line on-off, line sequence and line floating state at one time, improves the line check efficiency and increases the check accuracy.

[0034] In the device, the power supply unit 6 provides two voltage circuits, one of which is used for power supply of each unit module, and the other of which is used for power supply of the display control circuit 5 and the LED display array 4 alone, so as to realize the multi-line detection and large load capacity.

[0035] Embodiment 1

[0036] Reference Figure 2 The embodiment specifically comprises the following steps:

[0037] Step 1: The two ends of the line to be detected are connected with the IN connection port 2 and the OUT connection port 3 of the device respectively, wherein the connection port of the device comprises a plurality of connection modes for connecting different terminals of the multi-line, and the connection terminal is not limited to a certain fixed mode, but can be adjusted according to the actual line.

[0038] Step 2: After the device is powered on, the line on-off check signal is output by the CPU control signal input port 10 of the CPU control unit 1, which is low level effective, so that the MOS tube Q2 in the controlled display control circuit 5 is turned off, the Q2 is turned off and presents a high resistance state with a very small leakage current, the corresponding port of the LED display array 4 is turned on, and the LED is lighted. If the LED is not lighted, it indicates that the circuit is not turned on, the line is broken, the CPU control unit 1 sends a signal to the alarm unit 7 to prompt the alarm, and the line check is stopped. Each of the LED display array 4 is connected with a corresponding CPU control signal input port 10 and display control circuit 5 to control the display state.

[0039] Step 3: After the continuity check, the device enters the line sequence check mode, the CPU control signal input port 10 outputs the line sequence check signal in turn, which is high level active. At this time, the MOS tube Q2 in the display control circuit 5 is in the on state, the LED display array 4 corresponding line display is off, and the output sampling port 12 of the port sampling circuit 9 is low level. At this time, the line sequence is correct, and when the current port of the CPU control signal input is not low, the corresponding output sampling port 12 is not low, which means that the port does not correspond, and the line sequence is inconsistent. At this time, the CPU control unit 1 sends an alarm signal to the alarm unit 7 to prompt the alarm, and the line sequence check stops at the current check line.

[0040] Step 4: After the line sequence check, the device enters the floating check mode. The CPU control signal input port 10 of the CPU control unit 1 outputs the floating check signal, and the MOS tube Q2 in the display control circuit 5 is in the high resistance state with a small leakage current. The LED of the LED display array 4 is lit in turn. The CPU control unit 1 compares the sampling voltage of the floating AD sampling port 11 of the AD floating sampling circuit 8 with the threshold voltage to determine the floating state of the connection line. If the port sampling voltage is significantly less than the set threshold, it is determined that the line is floating, and the CPU control unit 1 sends a signal to the alarm unit 7 to alarm.

[0041] Example 2

[0042] For example, a connection mode of a line to be detected is taken as an example, and reference is made to Figure 3 which includes: the equivalent resistance R and R4 of the line to be detected, the display control circuit Q1, Q2, Q3, R2, R3, the LED display array D1, D2, D3~Dn, the protection circuit R5, R6, the AD floating sampling circuit Rs11~n, the port sampling circuit Rs21~n, and other peripheral circuits.

[0043] One end of the line to be detected is connected with VCC2, and the other end is connected with D1 of the display control circuit 5 and the LED display array 4, and the corresponding sampling circuits Rs11 and Rs21 are matched. After the line to be detected is connected with the connection port, the line continuity check is performed, the CPU control signal input port 10 outputs a low control signal, at this time Q1 connected with VCC1 is cut off, Q3 is turned on, and Q2 is turned off. The current flows from VCC2 through the line to be detected into D1 and the sampling circuit Rs21 to GND, the circuit is turned on, and D1 is lit. If the line is broken, it cannot form a loop, D1 is not lit, which means that the line is broken. The sampling signal output end 16 of the sampling circuit Rs21 outputs low level, the CPU control unit 1 sends an alarm signal to the alarm unit 7 to alarm, and the line check stops at the current position.

[0044] After the continuity check is completed, the device enters the line sequence check, and the CPU control signal input port 10 outputs a high level, at this time Q1 connected by VCC1 is turned on, Q3 is turned off, and a high level is given to Q2, Q2 is turned on, the current flows from VCC2 through the line to be detected to Q2 and the protection circuit R6 to GND, forming a loop, at this time D1 is extinguished, if the sampling signal output end 16 of the sampling circuit Rs21 outputs a low level, the line sequence is normal, if D1 continues to light after the CPU control signal input port 10 outputs a high level, the sampling signal output end 16 outputs a high level, indicating that the line sequence is inconsistent, the CPU control unit 1 sends an alarm signal to the alarm unit 7 to alarm, and the line check is stopped at the current position.

[0045] After the line sequence check is completed, the device enters the line floating check, and the CPU control signal input port 10 outputs a low level, at this time Q1 connected by VCC1 is turned off, Q3 is turned on, and a low level is given to Q2, Q2 is turned off, the current flows from VCC2 through the line to be detected to D1 and the sampling circuit Rs11 to GND, at this time D1 is extinguished, and the sampling circuit Rs11 divides the voltage to the floating AD sampling port 11, when the voltage is within the threshold voltage range, it indicates that the line is normal, if the threshold voltage is exceeded, it is determined that the line is floating, the CPU control unit 1 sends an alarm signal to the alarm unit 7 to alarm, and the line check is stopped at the current position.

[0046] It should be noted that in the above embodiment, the line check of one line to be detected is described, and the multi-line check mode is the same as described above, and the check of multiple lines can be completed according to the needs, and the number of lines to be checked is not limited.

[0047] The supply voltages provided by VCC1 and VCC2 can be adjusted according to the actual load test, VCC1 is used to consider the driving ability of the line to be detected, and VCC2 considers the voltage withstand ability of the line to be detected and the sensitivity of the sampling AD.

[0048] The threshold voltage can be set by different check lines, generally taking the minimum value of the normal connection state of the line, and being set according to the actual circuit.

[0049] In the line check, the sequence is not fixed, after the device is initialized, only one item, two items, or three items can be checked, and the next check only needs to initialize the device before checking.

[0050] The sampling resistors Rs11-n and Rs21-n have an accuracy of more than 1%, the higher the accuracy, the smaller the device error, and the more accurate the device detection.

[0051] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A multi-channel line inspection device, characterized in that, include: The system includes a CPU control unit (1), a connection port, an LED display array (4), a display control circuit (5), a power supply unit (6), an alarm unit (7), an AD floating sampling circuit (8), and a port sampling circuit (9); the connection port includes an IN connection port (2) and an OUT connection port (3). One end of the line to be tested is connected to the IN connection port (2), and the other end is connected to the OUT connection port (3); the IN connection port (2) is connected to the display control circuit (5) and the power supply unit (6), and the IN connection port (2) is marked with a sequence number; the display control circuit (5) is connected to the CPU control unit (1), the power supply unit (6) and the LED display array (4); the OUT connection port (3) is connected to the LED display array (4), and the OUT connection port (3) is marked with a sequence number; the alarm unit (7) is connected to the CPU control unit (1); the AD floating sampling circuit (8) is connected to the CPU control unit (1) and the LED display array (4), and the port sampling circuit (9) is connected to the CPU control unit (1) and the LED display array (4); the power supply unit (6) is also connected to the CPU control unit (1), the LED display array (4), the alarm unit (7), the AD floating sampling circuit (8), and the port sampling circuit (9) respectively.

2. The multi-channel line inspection device according to claim 1, characterized in that, The IN connection port (2) and OUT connection port (3) adopt composite terminal blocks.

3. The multi-channel line inspection device according to claim 1, characterized in that, When the display control circuit (5) is not in operation, it presents a high impedance state with a very small leakage current.

4. The multi-channel line inspection device according to claim 1, characterized in that, The power supply unit (6) is a rechargeable battery.

5. The multi-channel line inspection device according to claim 1, characterized in that, The AD floating sampling circuit (8) uses a high-precision sampling chip resistor.

6. A method for inspecting multi-channel lines, using the apparatus as described in any one of claims 1-5, characterized in that, Used to complete line continuity checks, line sequence checks, and line floating connection checks in a single operation; The line continuity check: After connecting the line to be tested through the IN connection port (2) and the OUT connection port (3), the device is powered on. The CPU control unit (1) port outputs high level from low level in sequence. The display control circuit (5) sequentially forms a path between the connection ports 1 to n and the LED display array (4). The continuity of the line is judged by the LED lighting status. When the LED is lit, the line is conducting. At this time, the port sampling circuit (9) corresponding to the LED display array (4) outputs a high level at the sampling port. When the LED is off, the line is broken. The specific line is determined according to the sequence number on the device. The wiring sequence check is as follows: The CPU control unit (1) pulls the connection ports 1 to n low in sequence through the display control circuit (5), and the LED display array (4) turns off in sequence. The output sampling port of the port sampling circuit (9) corresponding to the LED display array (4) should output a low level. If the connection port pulled low by the display control circuit (5) and the output sampling port are both at a low level, it means that the wiring sequence to be tested is correct. If they are not consistent, it means that the wiring sequence to be tested is incorrect. The CPU control unit (1) sends a signal to the alarm unit (7) to trigger an alarm, and the LED display array (4) displays the current problem location with a light. The line floating check: At this time, the LED display array (4) is in the off state. The CPU control unit (1) outputs a floating check signal. The AD floating sampling circuit (8) performs voltage sampling. The CPU control unit (1) compares the sampled voltage. If the sampled voltage of the AD floating sampling circuit (8) is significantly less than the set threshold, it is determined to be floating. The CPU control unit (1) sends a signal to the alarm unit (7), and the alarm unit (7) alarms.

7. The multi-channel line inspection method according to claim 6, characterized in that, The power supply unit (6) provides two voltages: one for supplying power to the display control circuit (5) and the LED display array (4), and the other for supplying power to other unit modules.

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