CN113253157A - Connector fault detection device and method - Google Patents
Connector fault detection device and method Download PDFInfo
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- CN113253157A CN113253157A CN202110513291.4A CN202110513291A CN113253157A CN 113253157 A CN113253157 A CN 113253157A CN 202110513291 A CN202110513291 A CN 202110513291A CN 113253157 A CN113253157 A CN 113253157A
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
Abstract
The invention provides a connector fault detection device and a method, wherein the device comprises: the resistance detection module is electrically connected with the timing module and used for determining the contact resistance measured value of the connector to be detected based on the voltage measured values at the two ends of the connector to be detected when constant current passes through the connector to be detected; the timing module is electrically connected with the open circuit detection module and used for determining the maintenance time of the contact resistance measured value which is more than or equal to the preset open circuit resistance value; and the open circuit detection module determines the open circuit fault type of the connector to be detected based on the maintaining time. The device and the method provided by the invention realize the detection of the instant open circuit fault of the connector, improve the accuracy of the fault detection of the connector, realize the automation of the fault detection of the connector and improve the fault detection efficiency of the connector.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a connector fault detection device and method.
Background
With the rapid development of engineering machinery, various intelligent products are applied to the engineering machinery more and more widely, and particularly, the quantity of various electrical connectors is more and more on an excavator and a mobile machine.
These connectors are flexible in design and easy to maintain, bring great convenience to communication and control between devices, greatly improve the performance of products, but also bring problems. The reliability of the electrical system, which is an important aspect of the reliability of the connector, greatly affects the reliability of the construction machine. It is therefore important to assess the reliability of electrical connectors and detect failures.
The existing connector fault detection mostly adopts a manual mode, utilizes a universal meter to carry out simple measurement, stops at the stage of wrong wiring and line break detection, cannot detect instant open circuit, and cannot realize connector fault detection automation.
Disclosure of Invention
The invention provides a connector fault detection device and method, which are used for solving the technical problems that the connector fault detection in the prior art cannot detect instant open circuit and cannot realize the automation of the connector fault detection.
The invention provides a connector fault detection device, comprising:
the resistance detection module is electrically connected with the timing module and used for determining the contact resistance measured value of the connector to be detected based on the voltage measured values at the two ends of the connector to be detected when constant current passes through the connector to be detected;
the timing module is electrically connected with the open circuit detection module and used for determining the maintenance time of the contact resistance measured value which is more than or equal to the preset open circuit resistance value;
and the open circuit detection module determines the open circuit fault type of the connector to be detected based on the maintaining time.
According to the connector fault detection device provided by the invention, the disconnection detection module is specifically used for:
if the maintaining time is within the preset time range, determining that the type of the open circuit fault of the connector to be detected is an instant open circuit;
the preset duration range is determined according to the requirements of the circuit where the connector to be detected is located on the power supply interruption time and/or the signal interruption time.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the clock module is electrically connected with the timing module and used for providing timing pulse signals for the timing module.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the self-checking module is electrically connected with the clock module and used for determining the self-checking pulse with the preset time length and determining the working state of the clock module based on the number of timing pulse signals in the process that the self-checking pulse passes through the pulse gate of the clock module.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the miswiring checking module is used for applying high level to each terminal on any side of the connector to be detected one by one, and determining the wiring results on two sides of the connector to be detected based on the high level detection result of each terminal on the opposite side of the connector to be detected.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the excitation module is used for generating a frequency sweep signal, and the frequency sweep signal is used for exciting the vibration table where the connector to be detected is located to generate vibration according to the frequency of the frequency sweep signal.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the constant current source module is used for providing a constant-size direct current power supply for the detection connector.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the communication module is electrically connected with each module in the connector fault detection device and is used for transmitting data of each module.
According to the connector fault detection device provided by the invention, the connector fault detection device further comprises:
and the upper computer is electrically connected with the communication module and is used for displaying and/or setting parameters in each module in the connector fault detection device.
The invention provides a connector fault detection method, which comprises the following steps:
determining a contact resistance measured value of the connector to be detected based on voltage measured values at two ends of the connector to be detected and a constant current passing through the connector to be detected;
determining the maintaining time of the contact resistance measurement value which is more than or equal to the preset breaking resistance value;
and determining the open circuit fault type of the connector to be detected based on the maintaining time.
According to the connector fault detection device and method provided by the embodiment of the invention, constant current passes through the to-be-detected connector, the contact resistance measurement value of the to-be-detected connector is determined according to the voltage measurement values at the two ends of the to-be-detected connector, the maintenance time that the contact resistance measurement value is greater than or equal to the preset open circuit resistance value is determined, and the open circuit fault type of the to-be-detected connector is further determined, so that the instant open circuit fault of the connector is detected, the accuracy of connector fault detection is improved, the automation of connector fault detection is realized, the efficiency of connector fault detection is improved, and the reliability of the connector is improved.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a connector fault detection device according to the present invention;
FIG. 2 is a second schematic structural diagram of the connector fault detection apparatus provided in the present invention;
FIG. 3 is a schematic flow chart of a connector fault detection method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The connectors are electrical components and have various failure types, such as open circuit, short circuit, instantaneous open circuit, miswiring, poor insulation, and the like. The instant open circuit refers to the phenomenon of short-term open circuit of the plug connector. The maintenance time of the instant open circuit is short, so that the detection is difficult, but the control system is easy to send out false alarm signals when the plug connector is subjected to the instant open circuit. Therefore, the detection of the instant open circuit of the plug connector is beneficial to eliminating false alarm signals of the control system and improving the reliability of the control system.
The invention provides a device for determining whether instantaneous disconnection occurs in a connector by measuring contact resistance. When a pair of contact pieces of the connector are inserted, contact resistance is formed at the contact interface of the connector, and according to the theory of electric contact, the contact resistance consists of three parts, namely concentrated resistance, film resistance and conductor resistance.
The concentrated resistance is a resistance formed by contraction or concentration of current lines when a current passes through an actual contact surface, and is also called a bundling resistance or a contraction resistance. The film resistance is the resistance formed by the contact surface film and other contaminants. From the contact surface state analysis, the surface contamination film can be divided into a firmer thin film layer and a looser impurity contamination layer. The film resistance may also be referred to as the interface resistance. The conductor resistance is dynamic contact resistance and instantaneous power-off dynamic contact resistance when the contact resistance of the contact of the electric connector is actually measured.
The contact form of the electric connector is a point contact form, a line contact form and a surface contact form. Whatever the contact type, will create an electrical resistance at the contact site. Among all factors affecting the contact resistance, the contact pressure is a main factor affecting the magnitude of the contact resistance. When the contact pressure remains unchanged or changes thereof are almost negligible, a "static contact resistance" is corresponded. In practical use, dynamic application environments such as vibration, impact, and collision affect the contact pressure at the contact portion, and the contact resistance is inevitably changed with the change of the contact pressure value, direction, and time, and the contact resistance at this time is called "dynamic contact resistance". The change is influenced by the external dynamic environment and occurs in a very short time, the contact resistance of the contact of the electric connector is reduced by extrusion, and the contact resistance of the contact of the electric connector is increased by traction, and even the connection is interrupted, thereby causing serious consequences.
Fig. 1 is a schematic structural diagram of a connector fault detection device provided in the present invention, and as shown in fig. 1, the device includes:
the resistance detection module 110 is electrically connected with the timing module 120 and is used for determining the contact resistance measured value of the connector to be detected based on the voltage measured values at the two ends of the connector to be detected when the constant current passes through the connector to be detected;
the timing module 120 is electrically connected with the disconnection detecting module 130 and is used for determining the maintenance time when the contact resistance measurement value is greater than or equal to the preset disconnection resistance value;
the open circuit detection module 130 determines the open circuit fault type of the connector to be detected based on the maintenance time.
Specifically, the types of disconnection faults of the connector to be detected include disconnection and instantaneous disconnection. The constant current can be provided for the connector, and the current magnitude is ensured to be constant when the contact resistance of the connector suddenly changes in a constant current source mode. The magnitude of the constant current can be set according to actual needs, for example, 10mA (milliamp). The voltage change values of the two ends of the connector to be detected can be measured, the contact resistance change value of the connector to be detected and the time duration of the contact resistance change value can be calculated, and whether the connector to be detected is disconnected or not and the type of the disconnected fault can be determined.
Since the magnitude of the current passing through the connector to be tested is constant, the resistance detection module 110 can determine the measured value of the contact resistance of the connector to be tested according to the measured values of the voltage at the two ends of the connector to be tested and send the measured value to the timing module 120.
If the contact pressure of the connector to be tested changes, the contact resistance measurement value also changes. The measured value of the contact resistance suddenly becomes large, which only indicates that the connector is likely to be broken, and at the moment, the measured value of the contact resistance can be compared with the preset breaking resistance value to judge whether the connector to be detected is broken or not. The preset open-circuit resistance value can be set according to the maximum value of the contact resistance when the plug connector to be detected works normally, and can be 1 ohm, 10 ohms, 100 ohms and the like. For example, if the maximum value of the to-be-detected connector in normal operation is 100 ohms, the preset open-circuit resistance value may be 100 ohms, and if the detected contact resistance measurement value is greater than or equal to 100 ohms, it may be determined that the to-be-detected connector is open-circuit. If the contact resistance measurement is 90 ohms, it can be assumed that the connector to be tested is not open.
When the connector to be detected is broken, the time for breaking is further combined to judge whether the connector is instantly broken. Therefore, the timing module 120 can obtain the holding time of the contact resistance measurement value being greater than or equal to the preset open circuit resistance value, and send the holding time to the open circuit detection module 130. Here, the holding time refers to a time period determined by a time starting point and a time ending point, wherein the time starting point is a time when the contact resistance measurement value increases to be greater than or equal to a preset open circuit resistance value, and the time ending point is a time ending point when the contact resistance measurement value decreases to be less than the preset open circuit resistance value, in the process of continuously detecting the contact resistance measurement value by the resistance detection module 110.
The open circuit detection module 130 determines the open circuit fault type of the connector to be tested according to the holding time sent by the timing module 120. For example, if the holding time is less than the set value, it is considered that instantaneous disconnection has occurred, and if the holding time is equal to or greater than the set value, it is considered that disconnection has occurred.
According to the connector fault detection device provided by the embodiment of the invention, constant current passes through the to-be-detected connector, the contact resistance measurement value of the to-be-detected connector is determined according to the voltage measurement values at the two ends of the to-be-detected connector, the maintenance time that the contact resistance measurement value is greater than or equal to the preset open circuit resistance value is determined, and then the open circuit fault type of the to-be-detected connector is determined, so that the instant open circuit fault of the connector is detected, the accuracy of connector fault detection is improved, the automation of connector fault detection is realized, the efficiency of connector fault detection is improved, and the reliability of the connector is improved.
Based on the above embodiments, the disconnection detecting module 130 is specifically configured to:
if the maintaining time is within the preset time length range, determining that the type of the open circuit fault of the connector to be detected is instantaneous open circuit;
the preset duration range is determined according to the requirements of the circuit where the connector to be detected is located on the power supply interruption time and/or the signal interruption time.
Specifically, for example, some circuits require power to be interrupted for no more than 9 microseconds, and thus the preset duration range may be [1, 9] microseconds (uS). When the maintaining time is less than 1 microsecond, the connector is considered to be broken, but the breaking time is too short, so that the operation of each component in the circuit is not influenced, and the situation of instantaneous breaking is not existed; when the holding time is longer than 9 microseconds, it is considered that the connector is disconnected, and the disconnection time is relatively long, which is not the case of instantaneous disconnection.
For some electrical components, the instant disconnection does not affect the electrical components, such as a common switch, a lamp and the like; however, for an electrical component with high power quality requirement, such as a power switching device or a circuit with a time control function, the control function may not be realized due to instantaneous disconnection.
In addition, if the holding time reaches the set value, the type of the open-circuit fault of the connector to be detected can be considered as instantaneous open circuit, and the set value can be an upper limit value of a preset duration range.
Based on any embodiment above, the apparatus further comprises:
and the clock module is electrically connected with the timing module 120 and is used for providing a timing pulse signal for the timing module 120.
Specifically, the clock module may use a passive crystal oscillator as an oscillation starting device, or may use an active crystal oscillator as an oscillation starting device, so as to provide a timing pulse signal for the timing module 120.
For example, the clock module may use a passive crystal oscillator as an oscillation starting device to provide a timing pulse signal with a frequency of 20MHz to the detection circuit. The timing method for the time length of the instant open circuit of the electric connector adopts a pulse counting method, namely, the circuit is determined to be open circuit when the detection circuit detects that the contact resistance measurement value of the connector is greater than or equal to the preset open circuit resistance value, the circuit automatically opens a pulse counting gate to allow a timing pulse signal of 20MHz to pass through the gate, then a counter counts the number of pulses, and the obtained number of pulses is multiplied by 0.05 microseconds to obtain the holding time and the time length of the instant open circuit. The measured maintaining time reaches the specified duration, the detection circuit determines that the connector is instantaneously disconnected, and data can be sent to a single chip microcomputer or other processors connected externally in an interruption mode.
The pulse counting method is a measure of the time of the dynamic contact resistance change of the connector, and for example, the combination of the measurement of the contact resistance and the duration thereof can be achieved by controlling the high-frequency pulse gate and the counter by the RS flip-flop. When the RS trigger measures the contact resistance with sudden change and maintains the contact resistance for a period of time, and the sudden change value and the maintaining time of the resistance reach specified values, the RS trigger locks the data and informs the detection singlechip of receiving the data and carrying out related processing in an interruption mode. And after the singlechip receives the data, the self-locking of the RS trigger is released, and a new instant open circuit is waited to be captured. Meanwhile, the single chip microcomputer sends the data to the upper computer through the serial port according to a self-defined data transmission protocol after processing the data. Or the data is displayed on the nixie tube and the sound-light alarm is started in a single machine state. Because the signal frequency adopted by the pulse counting method is higher, in order to improve the measurement precision, the number of pulse gates related to 20MHz signals and the number of chips before the pulse signals are sent to the counter are more and more preferable, so that the influence generated by chip delay is reduced, and the measurement result is closer to the true value.
Based on any embodiment above, the apparatus further comprises:
and the self-checking module is electrically connected with the clock module and used for determining the self-checking pulse with the preset time length and determining the working state of the clock module based on the number of timing pulse signals in the process that the self-checking pulse passes through the pulse gate of the clock module.
Specifically, the accuracy of the timing module 120 determines whether the detection result of the connector fault detection device is accurate. The timing pulse information signal provided by the clock module has a large influence on the timing module 120. Therefore, it needs to be checked by the self-checking module to determine whether it is in a normal operating state.
The main working principle of the self-checking module is to generate a self-checking pulse, namely a positive pulse with a preset time length, by using a monostable delay circuit. And enabling the self-checking pulse to pass through a pulse gate of the clock module, counting the number of timing pulse signals in the process that the self-checking pulse passes through the pulse gate of the clock module, calculating the length measurement value of the self-checking pulse, comparing the length measurement value with a preset time length, if the length measurement value is consistent with the preset time length, indicating that the working state of the clock module is normal, and if the length measurement value is inconsistent with the preset time length, indicating that the working state of the clock module is abnormal. The length measurement value of the self-checking pulse is the product of the time length of a single timing pulse signal and the number of the timing pulse signals in the process that the self-checking pulse passes through the pulse gate of the clock module.
For example, the self-checking pulse may be a positive pulse with a preset time length of 3 microseconds, when the positive pulse passes through a pulse gate of the clock module, the pulse gate is in an open state, and a timing pulse signal of 20MHz can reach the counter through the gate. After the self-checking pulse passes through the pulse gate, the pulse gate is in a closed state, and the timing pulse signal cannot reach the counter through the gate. Therefore, the length measurement of the self-test pulse is obtained by multiplying the counting result of the counter by 0.05 microseconds. If the length measurement value is 3 microseconds, the working state of the clock module is normal. If the length measurement value is not 3 microseconds, the working state of the clock module is abnormal.
If the self-checking module is connected with the nixie tube, the counting result of the counter can be directly displayed on the nixie tube so as to compare numerical values to judge whether the system is normal. In an online state, the counting result of a counter in the self-checking module can also be directly sent to an upper computer, the upper computer converts the counting result into a length measurement value, compares the length measurement value with the self-checking pulse, and then gives an automatic judgment result to indicate whether the connector fault detection device is in a normal working state or not.
In addition, before the clock module is checked, the self-checking pulse of the self-checking module is firstly measured to judge whether the length value of the monostable delay positive pulse generated by the self-checking module is consistent with the preset time length. Because the measuring condition is limited, the length of the self-checking monostable delay positive pulse cannot be directly read by an instrument, so a series of positive pulses can be obtained by adopting a continuous triggering mode, and then the length of a single positive pulse is measured by an oscilloscope. The one-stable time delay circuit can be continuously triggered by a rectangular wave with the period longer than 2 times of the self-checking positive pulse length, so that the rectangular wave with a certain period is generated.
Based on any embodiment above, the apparatus further comprises:
and the wrong wiring checking module is used for applying high level to each terminal on any side of the connector to be detected one by one and determining the wiring results on the two sides of the connector to be detected based on the high level detection result of each terminal on the opposite side of the connector to be detected.
Specifically, the wiring result is a connection result of terminals on both sides of the connector to be inspected. The operation principle of the miswiring inspection module is that a high-low level discrimination method is adopted, a high level is applied to any terminal on any side of the connector to be detected, and only the terminal connected with the side on the opposite side of the connector to be detected can detect the high level. By applying a high level to each terminal on the side one by one, the result of wiring between the terminal on the opposite side and the terminal on the side is determined, thereby determining whether or not erroneous wiring occurs.
For example, a circuit high level is added to one end of the connector to be tested, only one line of the connector is added with the high level at the same time, and the other lines are added with the low level. The successive rounds are performed downwards. Then, the other end of the connector is scanned cyclically from the first line in turn to check which lines get high and which get low. If the first line at the A terminal is added with high level and the rest is low level, the second line at the B terminal obtains high level, and the other lines at the B terminal are low level, the first line at the A terminal is connected with the second line at the B terminal. Similarly, the second line at the A end is connected with the first line at the B end. Therefore, the wrong connection of the first and second wires of the connector can be detected. The inspection of short circuit and insulation failure is similar to the inspection of wrong wiring.
Based on any embodiment above, the apparatus further comprises:
and the excitation module is used for generating a frequency sweeping signal, and the frequency sweeping signal is used for exciting the vibration table where the connector to be detected is located to generate vibration according to the frequency of the frequency sweeping signal.
Specifically, in order to detect whether the connector to be detected fails under the forced vibration condition, the vibration condition of the connector to be detected can be simulated through the vibration excitation module.
The excitation module may generate a frequency sweep signal, for example a sinusoidal frequency sweep signal of 10Hz to 200 Hz. The vibration excitation module can be electrically connected with a vibration table where the connector to be detected is located, and the vibration table generates vibration according to the frequency of the sweep frequency signal, so that the external vibration environment is simulated. The frequency of the sweep signal can be set according to different external environments, such as simulation of automobile roads, simulation of sea waves, simulation of aerospace environment, simulation of earthquakes, simulation of transportation conditions, vibration simulation during the operation of rolling stock and the like.
Based on any embodiment above, the apparatus further comprises:
and the constant current source module is used for providing a constant-size direct current power supply for the detection connector.
Specifically, the constant current source module is used in the connector fault detection device to provide a basis for judging the resistance value of the contact resistor of the open circuit of the connector. For an open circuit, the resistance of a normal electrical line should be very small or even close to zero. When the resistance value in the electric circuit is suddenly increased, the connector is abnormal, namely, the increase of the contact resistance indicates that the connector circuit has poor contact, and the connector is broken when the resistance value is larger than a certain value. Depending on the situation, the resistance measurement varies greatly in accuracy, resolution and range, and generally speaking, the three cannot be optimized simultaneously. There are various methods for measuring the line resistance, including voltage compensation voltammetry, four-wire method and voltage method. The connector fault detection device provided by the invention adopts the latter, namely supplies power to the connector to be detected through the constant current source, and then measures the voltage drop at two ends of the connector.
Similarly, the constant current source can be used for supplying power to the resistor with the preset disconnection resistance value to obtain corresponding voltage, and the voltage of the resistor and the voltage can be input into the voltage comparator to be compared with each other in voltage magnitude, so that whether the contact resistance of the connector to be detected is suddenly increased or not can be known.
Based on any embodiment above, the apparatus further comprises:
and the communication module is electrically connected with each module in the connector fault detection device and is used for transmitting the data of each module.
Specifically, the communication unit may be disposed in a circuit board of the connector fault detection apparatus, and electrically connected to each module, respectively, to transmit detection data of each module to a remote device, or to obtain parameters from the remote device and send the parameters to the corresponding module.
Based on any embodiment above, the apparatus further comprises:
and the upper computer is electrically connected with the communication module and is used for displaying and/or setting parameters in each module in the plug-in fault detection device.
Specifically, the connector fault detection device can adopt an upper computer and lower computer scheme, an upper computer is independently arranged, and other modules are arranged into a lower computer.
For example, the upper computer may use a Windows operating system as a platform, program with VC + +6.0, operate the database, optimize the upper computer interface, and graphically detect the result.
The lower computer adopts a singlechip and a TTL basic circuit, and a seven-segment digital tube displays the measurement result. The lower computer can set the pin number of the connector, the judgment standard of the time length of the instant open circuit, the judgment standard of the open circuit resistance, the measurement and self-checking state of the detection system and the single-machine on-line state selected by the switch button and the single-system work or work in combination with the upper computer.
Based on any of the above embodiments, fig. 2 is a second schematic structural diagram of the connector fault detection device provided by the present invention, as shown in fig. 2, the device is provided with an excitation module, a self-detection module, a fault detection peripheral circuit, a connector and a PC. Except for a power supply module, a display output module, a panel input module, etc.
The PC is an upper computer and is mainly responsible for sending instructions to a lower computer, receiving, displaying and printing detection data, storing the data into a database and reading out a detection history record from the database. Relevant classification statistics can be performed on the data. And checking the current working state of the lower computer and setting working parameters of the lower computer.
The device comprises an excitation module, a self-checking module, a fault detection peripheral circuit, a power supply module, a display output module, a panel input module, a parameter setting singlechip and a detection processing singlechip. The parameter setting single chip microcomputer is responsible for setting all relevant parameters, and the detection processing single chip microcomputer is responsible for detection, data storage and data transmission of the connector.
The power module needs to supply four voltages to the circuit, including positive 12V, negative 12V, positive 5V and negative 5V. The positive and negative voltages supply power to the constant current source. The positive 5V supplies power to the basic circuit and the single chip microcomputer and serves as a reference voltage for analog-digital conversion. And negative 5V is used as the reference voltage for digital-to-analog conversion. The power module adopts an alternating current 220V power supply obtained from commercial power and adopts a linear voltage-stabilizing method to supply power to the circuit. Firstly, an alternating current 220V power supply is subjected to voltage reduction and rectification, then filtering is carried out to obtain a power supply close to direct current, and then an integrated linear voltage stabilizing module is adopted to stabilize voltage to obtain voltage. The step-down adopts a power transformer to change alternating current 220V into alternating current 18V, and the alternating current after the step-down is rectified by utilizing the unidirectional conduction characteristic of a diode so as to change the alternating current into low-voltage direct current. In an actual circuit, a single-phase bridge rectifier circuit is mostly adopted. The rectified voltage is a unidirectional pulsating voltage and is not suitable for powering electronic circuits. Generally, after rectification, in order to obtain a relatively ideal dc voltage, components with an energy storage function, such as a capacitor and an inductor, are further used to form a filter circuit, so as to convert the pulsating dc voltage into a relatively smooth dc voltage to meet the needs of electronic circuits and devices. Capacitive filtering, inductive filtering and complex filtering are commonly used. Since the current is not large and the load variation is not large, capacitive filtering is employed.
The display output part comprises data display of the detection device in a single machine state, indication of a circuit related state and data transmission to the PC machine in an online state. The input section includes obtaining test data from the base test module, obtaining set standard values from corresponding control buttons, switches, etc., and receiving control instructions and parameter value settings from the PC, etc. For nixie tube display, a three-in-one nixie tube display is adopted, and in order to save pins of a single chip microcomputer, a dynamic scanning method is adopted to display detection data. Under the working state of the single machine, the circuit detects the instantaneous interruption of the connector and immediately displays the detection data, and simultaneously reminds related personnel to record the detection result in an audible and visual alarm mode. After the clear button is pressed, the acousto-optic alarm is released, and meanwhile, the nixie tube data is cleared to wait for the next detection result to be displayed. The single panel can also set a contact resistance value standard and an open circuit time standard in a knob mode, and set single on-line work, detection and replacement of connectors and the like in a toggle switch mode. The switches in the form of buttons include zero clearing, self-checking, simulated vibration, and the like.
The traditional detection of the connector is mostly in a manual mode, and a multimeter is used for carrying out simple measurement. The method is mostly in the stage of wrong wiring and broken wire detection, and the method cannot detect instant broken wire and further cannot realize automation, microcomputer control, data processing and the like. In this regard, it is an object of embodiments of the present invention to provide multi-level measurement and automated detection of connector failures. The research condition mainly aims at the factory for producing the connector of the rolling stock, and aims to improve the reliability of the connector of the engineering machinery before being assembled and ensure that the electrical connector used on the rolling stock has the reliability meeting the requirement. And the microcomputer control, data storage and query, graphic display of detection results and the like are realized.
Based on any of the above embodiments, fig. 3 is a schematic flow chart of a connector fault detection method provided by the present invention, as shown in fig. 3, the method includes:
According to the connector fault detection method provided by the embodiment of the invention, constant current passes through the to-be-detected connector, the contact resistance measurement value of the to-be-detected connector is determined according to the voltage measurement values at the two ends of the to-be-detected connector, the maintenance time that the contact resistance measurement value is greater than or equal to the preset open circuit resistance value is determined, and then the open circuit fault type of the to-be-detected connector is determined, so that the instant open circuit fault of the connector is detected, the accuracy of connector fault detection is improved, the automation of connector fault detection is realized, the efficiency of connector fault detection is improved, and the reliability of the connector is improved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes commands for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A connector failure detection device, comprising:
the resistance detection module is electrically connected with the timing module and used for determining the contact resistance measured value of the connector to be detected based on the voltage measured values at the two ends of the connector to be detected when constant current passes through the connector to be detected;
the timing module is electrically connected with the open circuit detection module and used for determining the maintenance time of the contact resistance measured value which is more than or equal to the preset open circuit resistance value;
and the open circuit detection module determines the open circuit fault type of the connector to be detected based on the maintaining time.
2. The connector fault detection device of claim 1, wherein the open circuit detection module is specifically configured to:
if the maintaining time is within the preset time range, determining that the type of the open circuit fault of the connector to be detected is an instant open circuit;
the preset duration range is determined according to the requirements of the circuit where the connector to be detected is located on the power supply interruption time and/or the signal interruption time.
3. The connector fault detection device of claim 1, further comprising:
and the clock module is electrically connected with the timing module and used for providing timing pulse signals for the timing module.
4. The connector fault detection device of claim 3, further comprising:
and the self-checking module is electrically connected with the clock module and used for determining the self-checking pulse with the preset time length and determining the working state of the clock module based on the number of timing pulse signals in the process that the self-checking pulse passes through the pulse gate of the clock module.
5. The connector fault detection device of claim 1, further comprising:
and the miswiring checking module is used for applying high level to each terminal on any side of the connector to be detected one by one, and determining the wiring results on two sides of the connector to be detected based on the high level detection result of each terminal on the opposite side of the connector to be detected.
6. The connector fault detection device of claim 1, further comprising:
and the excitation module is used for generating a frequency sweep signal, and the frequency sweep signal is used for exciting the vibration table where the connector to be detected is located to generate vibration according to the frequency of the frequency sweep signal.
7. The connector fault detection device of claim 1, further comprising:
and the constant current source module is used for providing a constant-size direct current power supply for the detection connector.
8. Connector failure detection apparatus according to any of claims 1 to 7, further comprising:
and the communication module is electrically connected with each module in the connector fault detection device and is used for transmitting data of each module.
9. The connector fault detection device of claim 8, further comprising:
and the upper computer is electrically connected with the communication module and is used for displaying and/or setting parameters in each module in the connector fault detection device.
10. A connector fault detection method is characterized by comprising the following steps:
determining a contact resistance measured value of the connector to be detected based on voltage measured values at two ends of the connector to be detected and a constant current passing through the connector to be detected;
determining the maintaining time of the contact resistance measurement value which is more than or equal to the preset breaking resistance value;
and determining the open circuit fault type of the connector to be detected based on the maintaining time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110513291.4A CN113253157A (en) | 2021-05-11 | 2021-05-11 | Connector fault detection device and method |
| PCT/CN2022/082041 WO2022237324A1 (en) | 2021-05-11 | 2022-03-21 | Connector fault detection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110513291.4A CN113253157A (en) | 2021-05-11 | 2021-05-11 | Connector fault detection device and method |
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| CN113253157A true CN113253157A (en) | 2021-08-13 |
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| CN202110513291.4A Pending CN113253157A (en) | 2021-05-11 | 2021-05-11 | Connector fault detection device and method |
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| WO (1) | WO2022237324A1 (en) |
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