CN110780238A

CN110780238A - Multi-core cable detection device

Info

Publication number: CN110780238A
Application number: CN201911263417.6A
Authority: CN
Inventors: 涂金龙; 徐有军; 潘彩霞
Original assignee: Nanjing Communications Institute of Technology
Current assignee: Nanjing Communications Institute of Technology
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-02-11

Abstract

A multi-core cable detection device comprises a voltage stabilizing unit (1), an IC detection unit (2), a pulse distribution unit (3), a cable detection unit (4), a first indicating unit (5) and a second indicating unit (6). The LM2904 integrated circuit is used for generating square wave signals, the frequency of the square wave signals is changed by changing parameters, and the frequency-changing square wave signals can be used for detecting whether the functions of the appointed integrated circuit are normal or not and detecting whether a multi-core cable is normal or not, and judging whether the cable has the problems of wire breakage, insufficient soldering, wrong soldering and the like by judging whether an LED which is easy to observe is lightened or not. The device utilizes the LED as a light-emitting device, and has the advantages of high brightness, high response speed, convenient use, small volume, light weight, long service life and the like.

Description

Multi-core cable detection device

Technical Field

The invention relates to a circuit detection technology, in particular to an integrated circuit and multi-core cable detection technology, and belongs to the technical field of detection.

Background

With the development of electronic and control technologies, the use of multi-core cables is becoming more and more common, and in some manufacturing enterprises or scientific research units, multi-core cables with plugs and sockets are often used in experiments or products. During the production, processing and use, the cables need to be tested so as to check whether each cable has the phenomenon of wrong and missing welding or open circuit. Usually, the universal meter is used for sequentially measuring the conduction condition one by one at two ends of a cable, the measurement is more complicated and error-prone for cables with more cores, and the measurement is time-consuming and labor-consuming for cables produced in large batch.

At present, some technologies and methods for detecting multi-core cables can play a certain role in a specified scene, and have a positive role in improving production efficiency, however, for some application scenes, the effect is not ideal, for example, cross welding errors of cable cores cannot be detected, and the like, which is easy to occur when the multi-core cables are manufactured in batch, so that a simpler and more reasonable scheme is needed to solve the problem.

Disclosure of Invention

The invention aims to provide a multi-core cable detection device which can detect and indicate the wrong welding and the missing welding of a multi-core cable and can detect whether an Integrated Circuit (IC) with a specified model can work normally.

The invention is realized by the following steps: a multi-core cable detection device, comprising: the device comprises a voltage stabilizing unit (1), an IC detection unit (2), a pulse distribution unit (3), a cable detection unit (4), a first indication unit (5) and a second indication unit (6); wherein:

voltage stabilizing unit (1): the multi-core cable detection device is provided with stable working voltage and is electrically connected with the IC detection unit (2), the pulse distribution unit (3) and the cable detection unit (4);

IC detection unit (2): the integrated circuit is provided with a selector switch, the selector switch is used for detecting whether the LM2904 integrated circuit can work normally when being switched off, and a high-frequency pulse signal is provided for the pulse distribution unit when the selector switch is switched on, and is electrically connected with the voltage stabilizing unit (1), the pulse distribution unit (3) and the first indicating unit (5);

pulse allocation unit (3): the pulse signals output by the IC detection unit (2) are circularly and alternately output and are electrically connected with the voltage stabilizing unit (1), the IC detection unit (2) and the cable detection unit (4);

cable detection unit (4): the device is used for detecting the wrong welding and the missing welding of the multi-core cable and is electrically connected with the voltage stabilizing unit (1), the pulse distribution unit (3) and the second indicating unit (6);

first indicating unit (5): indicating whether the power supply and the detected IC are normal or not, and forming electrical connection with an IC detection unit (2);

second indicating unit (6): indicating whether the detected multi-core cable is normal or not, and electrically connecting with a cable detection unit (4).

The invention is formed by combining the units according to the conception, and the working principle is as follows: the LM2904 integrated circuit is used for generating a square wave signal, and the frequency of the square wave signal is changed by changing parameters: when the output is a low-frequency signal, the detection circuit is used for detecting whether the function of the LM2904 integrated circuit is normal or not; when the output is a high-frequency signal, the multi-core cable is used for detecting whether the multi-core cable is normal or not, and whether the cable has the problems of disconnection, insufficient soldering, wrong soldering and the like is judged by judging whether the LED which is easy to observe is lightened or not.

The invention has the advantages and effects that:

(1) it is easy to identify whether a cable has a problem: every heart yearn of being surveyed the cable corresponds an LED pilot lamp, and each LED all lights, shows that the cable is good, otherwise the cable has the problem, like broken string, rosin joint, wrong welding, and it has the problem to indicate the heart yearn that corresponds not to light by which LED lamp.

(2) By using the integrated circuit socket, whether the function of the integrated circuit is normal can be conveniently detected.

(3) The LED is used as a light emitting device, and has the advantages of high brightness, high response speed, low power consumption, small volume, light weight, long service life and the like.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic block diagram of the circuit of the present invention.

Fig. 2 is a schematic diagram of a voltage stabilization unit circuit connection of the embodiment.

FIG. 3 is a schematic circuit diagram of the IC detection unit and the first indication unit according to the embodiment.

Fig. 4 is a schematic diagram of the electrical connection of the pulse distribution unit, the cable detection unit and the second indicating unit of the embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and the embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

Referring to fig. 1, a multi-core cable detection apparatus includes: the device comprises a voltage stabilizing unit (1), an IC detection unit (2), a pulse distribution unit (3), a cable detection unit (4), a first indication unit (5) and a second indication unit (6); wherein: the voltage stabilizing unit (1) provides stable working voltage for the multi-core cable detection device and is electrically connected with the IC detection unit (2), the pulse distribution unit (3) and the cable detection unit (4); the IC detection unit (2) is internally provided with a selection switch, when the selection switch is switched off, the selection switch is used for detecting whether the LM2904 integrated circuit can work normally, and when the selection switch is switched on, the selection switch provides a high-frequency pulse signal for the pulse distribution unit and is electrically connected with the voltage stabilizing unit (1), the pulse distribution unit (3) and the first indicating unit (5); the pulse distribution unit (3) circularly and alternately outputs the pulse signals output by the IC detection unit (2) and is electrically connected with the voltage stabilizing unit (1), the IC detection unit (2) and the cable detection unit (4); the cable detection unit (4) is used for detecting the wrong welding and the missing welding of the multi-core cable and is electrically connected with the voltage stabilizing unit (1), the pulse distribution unit (3) and the second indication unit (6); the first indicating unit (5) is used for indicating whether the power supply and the detected IC are normal or not and is electrically connected with the IC detecting unit (2); the second indicating unit (6) is used for indicating whether the detected multi-core cable is normal or not and is electrically connected with the cable detecting unit (4).

Referring to fig. 2, the device is powered by a simple and convenient linear voltage-stabilized power supply, J1 is a dc power input socket, U1 is a voltage-stabilized integrated circuit of type LM7812, and capacitors C1, C2 and C3 are filter capacitors.

Referring to fig. 3, the IC testing unit includes an IC socket U2, resistors R1-R5, R7-R10, capacitors C4-C6, and a selection switch S1, the IC socket U2 uses an IC testing socket with a locking structure, and an IC LM2904 is mounted on the socket.

The integrated circuit socket U2 is characterized in that a resistor R10 is connected between a 1 st pin and a 2 nd pin, a capacitor C5 is connected between the 2 nd pin and GND, a resistor R7 is connected between a 3 rd pin and the 1 st pin, and the 3 rd pin is also connected with a resistor R8 to VCC and a resistor R9 to GND;

the resistor R5 is connected in series with the selection switch S1, then connected in parallel with the resistor R4, and connected between the 7 th pin and the 6 th pin of the integrated circuit socket U2, the capacitor C4 is connected between the 6 th pin and GND, the resistor R1 is connected between the 5 th pin and the 7 th pin, and the 5 th pin is also connected with the resistors R2 to VCC and the resistors R3 to GND.

The first indicating unit comprises current limiting resistors R11-R13 and light emitting diodes D11-D13, wherein D11 is used for indicating the state of a power supply, and D12 and D13 are used for indicating whether the integrated circuit works normally; when the integrated circuit is tested, the selection switch S1 is in an off state, when the integrated circuit LM2904 works normally, the light emitting diodes D12 and D13 are on and off alternately at low frequency, human eyes can recognize that the LEDs are in a flashing state, and the flashing frequency is determined by the parameters of the resistance and the capacitance of the external connection of the No. 2 pin, the No. 3 pin, the No. 5 pin and the No. 6 pin of the U2.

In the embodiment, 100k Ω is used for the resistors R1-R3, R7-R9, 2.2M Ω is used for the resistors R4 and R10, 20 k Ω is used for the resistor R5, 3 k Ω is used for the resistors R11-R13, and 0.1uF is used for the capacitors C4 and C5.

Referring to fig. 4, the pulse allocation unit is implemented by an integrated circuit U3, and is of a type CD4017, the 14 th pin of U3 is connected to the 7 th pin of U2, and functions to input a pulse signal output from the 7 th pin of U2 to the inside of the integrated circuit through the 14 th pin of U3, and the pulse signal is circularly output to ports Q0 to Q9 after being logically converted.

The cable detection unit consists of cable sockets J2 and J3, triodes V1-V20 and resistors R24-R33, when the cores of the cable are correctly connected, the light-emitting diodes D1-D10 are alternately turned on and off at high frequency, and due to the characteristic of vision persistence of human eyes, the LED lamps D1-D10 are normally on; if the cable has problems such as disconnection, insufficient soldering and wrong soldering, corresponding LED lamps are not lighted, and which LED lamp is not lighted indicates that the corresponding core wire has problems. Therefore, the device can be used for detecting the quality of the multi-core cable, and is clear, simple and convenient.

Taking the 1 st core cable as an example, the connection relationship is described as follows: a Q0 signal output by a pin 3 of the integrated circuit U3 is connected with the base of the triode V1 and one end of the resistor R24, and the other end of the R24 is connected with the base of the triode V11; the collector of the triode V1 is connected to a power supply VCC, the emitter of the V1 is connected to the resistor R14, the other end of the resistor R14 is connected with the anode of the light emitting diode D1, and the cathode of the D1 is connected to the 1 st pin of the cable socket J1; the collector of the transistor V11 is connected to pin 1 of the cable socket J3, and the emitter is connected to the power supply GND.

When the Q0 of the U3 outputs high level, if the 1 st core of the cable is correctly connected, the triodes V1 and V11 are both conducted, and the light-emitting diode D1 is lightened; if the 1 st core of the cable is disconnected or incorrectly connected, the collectors of the resistors R14, D1 and V11 cannot form an electric path, and the output levels of the other output pins Q1 to Q9 of the U3 are all low, so that the light-emitting diode D1 is extinguished, and the other light-emitting diodes D2 to D10 are also extinguished; when the ports Q0-Q9 of the U3 fast circulate to output high levels in turn, due to the characteristic of visual persistence of human eyes, the LED lamps correspondingly connected with correct cable cores are all lighted, and therefore the problem of the corresponding cable cores can be conveniently identified according to which LED lamp is not lighted.

The second indicating unit comprises current limiting resistors R14-R23 and light emitting diodes D1-D10; when the multi-core cable is tested, the selection switch S1 is in the on state, the light emitting diode D12 is alternately turned on and off at a high frequency, and the LED lamp D12 is seen to be normally on due to the characteristic of vision persistence of human eyes.

In the embodiment, 2N5551 is used for the transistors V1-V20, 680 omega is used for the resistors R14-R23, 30k omega is used for the resistors R24-R33, and phi 3 high-brightness light emitting diodes are used for the resistors D1-D10.

Claims

1. A multi-core cable detection device, comprising: the device comprises a voltage stabilizing unit (1), an IC detection unit (2), a pulse distribution unit (3), a cable detection unit (4), a first indication unit (5) and a second indication unit (6); wherein:

second indicating unit (6): indicating whether the detected multi-core cable is normal or not, and forming electrical connection with a cable detection unit (4);

when the integrated circuit is tested, the selection switch S1 is in an off state, when the integrated circuit LM2904 works normally, the light-emitting diodes D12 and D13 are alternately turned on and off at low frequency, and the LED can be identified by human vision to be in a flashing state;

when the multi-core cable is tested, the selection switch S1 is switched on, the light emitting diode D12 is alternately turned on and off at high frequency, and due to the characteristic of vision persistence of human eyes, the LED lamp D12 is normally turned on, and the LED lamps corresponding to the correct cable cores are turned on.

2. The multi-core cable detection device as claimed in claim 1, wherein the IC detection unit comprises an IC socket U2, resistors R1-R5, R7-R10, capacitors C4-C6, and a selection switch S1, the IC socket U2 uses an IC test socket with a locking structure, and an IC LM2904 is mounted on the socket;

3. The multi-core cable detection device according to claim 1, wherein the pulse distribution unit is served by an integrated circuit U3, the model is CD4017, the 14 th pin of U3 is connected to the 7 th pin of U2, the pulse signal output from the 7 th pin of U2 is input into the integrated circuit through the 14 th pin of U3, and is circularly output to ports Q0-Q9 after logic conversion.

4. The multi-core cable detection device according to claim 1, wherein the cable detection unit is composed of cable sockets J2 and J3, triodes V1-V20, and resistors R24-R33;

a Q0 signal output by a pin 3 of the integrated circuit U3 is connected with the base of the triode V1 and one end of the resistor R24, and the other end of the R24 is connected with the base of the triode V11; the collector of the triode V1 is connected to a power supply VCC, the emitter of the V1 is connected to the resistor R14, the other end of the resistor R14 is connected with the anode of the light emitting diode D1, and the cathode of the D1 is connected to the 1 st pin of the cable socket J1; the collector of the transistor V11 is connected to pin 1 of the cable socket J3, and the emitter is connected to the power supply GND.