CN111474410B - Detection method of electric connector - Google Patents

Detection method of electric connector Download PDF

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CN111474410B
CN111474410B CN202010264358.0A CN202010264358A CN111474410B CN 111474410 B CN111474410 B CN 111474410B CN 202010264358 A CN202010264358 A CN 202010264358A CN 111474410 B CN111474410 B CN 111474410B
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contact resistance
state
electrical connector
electric connector
detection time
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CN111474410A (en
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毛任重
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Ningbo Zhongqiang Electronic Appliance Co ltd
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Ningbo Zhongqiang Electronic Appliance Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The embodiment of the invention provides a detection method of an electric connector, which specifically comprises the following steps: step S1, detecting the contact resistance of the electric connector to obtain the nth detectionContact resistance R corresponding to measuring time n (ii) a Step S2, the contact resistance is preprocessed to obtain the optimal contact resistance y at the nth detection time n (ii) a Step S3, constructing a state detection model of the electric connector; step S4, according to the state detection model and the optimal contact resistance y n And judging whether the electric connector is in an effective connection state or a poor connection state. The invention can accurately detect the state of the electric connector and realize accurate judgment of the state of the electric connector.

Description

Detection method of electric connector
Technical Field
The invention relates to the technical field of electric connectors, in particular to a detection method of an electric connector.
Background
An electrical connector serves as a basic element for the transmission and control of electrical signals and the electrical connection between electronic and electrical devices. The method is widely applied in the industries of aerospace, electronics, communication and the like, and has considerable quantity and important position. The electrical connector is required to reliably open a circuit, transmit information, and realize specific functions in various harsh environments and various harsh conditions, and the reliability of the electrical connector directly affects whether the equipment can reliably operate, and system failure is sometimes caused by the failure of the electrical connector. Methods of detecting electrical connections have been of great interest. Despite the various preventive maintenance measures adopted in power systems and the guidance provided by a number of standards/specifications, problems with system reliability remain common.
Aiming at the prior art, firstly, the calculation method of the contact resistance of the electric connector is not accurate enough; secondly, because the contact resistance is related to many factors such as contact position materials, surface roughness, space environment and the like, the calculation value of the contact resistance of the electric connector has low accuracy; then, at present, no effective state detection model of the electrical connector exists, and the state of the electrical connector cannot be accurately detected.
Disclosure of Invention
The present invention is proposed in view of the above problems, so as to provide a method for detecting an electrical connector, which can accurately detect the state of the electrical connector, and realize accurate judgment of the state of the electrical connector.
The method comprises the following steps:
step S1, detecting the contact resistance of the electric connector to obtain the contact resistance R corresponding to the nth detection time n ；
Step S2, the contact resistance is preprocessed to obtain the optimal contact resistance y at the nth detection time n ；
Step S3, constructing a state detection model of the electric connector;
step S4, according to the state detection model and the optimal contact resistance y n Judging whether the electric connector is in an effective connection state or a poor connection state;
the step S2 specifically comprises steps S21-S23;
step S21: sequentially obtaining the contact resistances of the four continuous detection times n-3, n-2, n-1 and n to obtain a signal f n ：
Figure GDA0003564827270000021
Step S22: definition of y 1 、y 2 、y 3 Are each equal to R 1 、R 2 、R 3 To the signal f n The following treatments were carried out:
Figure GDA0003564827270000022
wherein e is n Is a signal f n Optimum contact resistance y with the n-1 detection time n-1 Error value of, Δ e n Is e n And e n-1 A, beta is a proportionality coefficient, delta n Is the nth detection time e n Correction amount of δ n For the nth detection of the time-of-day signal f n The correction amount of (1);
step S23: when R is n ≥f n And then the optimal contact resistance at the nth detection time is as follows:
Figure GDA0003564827270000023
when R is n ＜f n And then, the optimal contact resistance at the nth detection time is as follows:
Figure GDA0003564827270000024
the step S3 specifically includes:
in step S2, the optimum contact resistance of the electrical connector is obtained, and is denoted as R ═ y 1 ，y 2 ，……，y n Define the objective function as:
Figure GDA0003564827270000025
and:
Figure GDA0003564827270000026
wherein u is ij Probability value for the jth optimum contact resistance belonging to the ith state set, c i C is the number of state sets, and m is a preset constant, as a desired amount of the ith state set corresponding to the optimal contact resistance.
To ensure that the objective function can be solved, a new objective function is defined
Figure GDA0003564827270000027
Wherein, γ j Are indeterminate coefficients.
For u is paired ij 、c i The derivative is taken and made zero, and u, which minimizes the new objective function, is obtained ij 、c i ：
Figure GDA0003564827270000031
Figure GDA0003564827270000032
According to the given state set number c, the ending threshold value epsilon and the maximum iteration number, c corresponding to each state set is obtained i 、u ij ；
The step S4 specifically includes:
when the electric connector is detected, two state sets, namely a connection effective state and a connection poor state, are adopted, a state detection model is adopted, c1 and c2 corresponding to the connection good state and the connection poor state respectively are solved, and then corresponding probability values are obtained
Figure GDA0003564827270000033
Wherein u is effect Probability value of connection validity for the optimum contact resistance to be detected, d effect For the difference between the optimum contact resistance to be detected and the expected value of the effective connection state, d fail And the difference value of the optimal contact resistance to be detected and the poor connection state is obtained.
Obtaining c corresponding to each state set according to the given state set number c, the ending threshold epsilon and the maximum iteration number i 、u ij The method comprises the following specific steps:
(1) for u to u ij Performing initial assignment;
(2) according to c i Of calculation formula c i ；
(3) If c is i If the variation of (2) is less than or equal to the ending threshold value epsilon, or the iteration number reaches the maximum iteration number, stopping the calculation; otherwise, use U ij Formula (c) calculates new u ij And (5) returning to the step (2).
The invention has the beneficial effects that:
(1) the invention provides a method for calculating the contact resistance of an electric connector, which can accurately calculate the contact resistance of the electric connector.
(2) The invention provides a pretreatment method of the contact resistance of the electric connector, which can effectively remove external interference and further improve the calculated value of the contact resistance of the electric connector.
(3) The invention provides an effective state detection model of an electric connector, which can realize accurate judgment of the state of the electric connector and improve the accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for inspecting an electrical connector according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a" and "an" typically include at least two, but do not exclude the presence of at least one.
The invention is further described with reference to the following figures and specific examples.
Fig. 1 illustrates a method for inspecting an electrical connector according to the present invention.
As shown in fig. 1, the present invention provides a method for inspecting an electrical connector, the method comprising:
and step S1, detecting the contact resistance of the electric connector to obtain the contact resistance Rn corresponding to the nth detection time.
Step S2, the contact resistance is preprocessed to obtain the optimal contact resistance y at the nth detection time n 。
Step S3, a status detection model of the electrical connector is constructed.
Step S4, according to the state detection model and the optimal contact resistance y n And judging whether the electric connector is in an effective connection state or a poor connection state.
Further, the step S1 includes:
step S11: using A/D chip to conduct instantaneous current I through electric connector t And instantaneous voltage U across the electrical connector t Detecting to obtain a current detection signal I at the nth detection time n Voltage detection signal U n 。
Step S12: calculating the contact resistance R corresponding to the nth detection time n 。
Current I t Voltage U t The relationship of (1) is:
Figure GDA0003564827270000051
wherein R is t L correspond to the instantaneous contact resistance and the equivalent inductance of the electrical connector at time t, respectively, the equivalent inductance L being obtainable from the data manual of the electrical connector.
Discretizing and converting the formula (1) to obtain the contact resistance
Figure GDA0003564827270000052
Where Δ t is the detection period.
Further, the step S2 includes:
step S21: sequentially acquiring contact resistances of four continuous detection times n-3, n-2, n-1 and n, and processing according to a formula (3) to obtain a signal f n And is used for enhancing the detected contact resistance which is too small and limiting the detected contact resistance which is too large.
Figure GDA0003564827270000053
Step S22: for signal f n The following treatments were carried out:
Figure GDA0003564827270000054
wherein e is n Is a signal f n Optimum contact resistance y with the n-1 detection time n-1 Error value of, Δ e n Is e n And e n-1 A, beta is a proportionality coefficient, delta n Is the nth detection time e n Correction amount of δ n For the nth detection of the time-of-day signal f n And y1, y2 and y3 are respectively equal to R1, R2 and R3.
Step S23: when R is n When the current value is more than or equal to fn, the optimal contact resistance at the nth detection time is as follows:
Figure GDA0003564827270000061
when R is n If the current value is less than fn, the optimal contact resistance at the nth detection time is as follows:
Figure GDA0003564827270000062
further, the step S3 includes:
in step S2, the optimum contact resistance of the electrical connector is obtained, and is denoted as R ═ y 1 ，y 2 ，……，y n Define the objective function as:
Figure GDA0003564827270000063
and:
Figure GDA0003564827270000064
wherein u is ij Probability value for the jth optimum contact resistance belonging to the ith state set, c i C is the number of state sets, and m is a preset constant, as a desired amount of the ith state set corresponding to the optimal contact resistance.
To ensure that the objective function can be solved, a new objective function is defined
Figure GDA0003564827270000065
Wherein, γ j Are indeterminate coefficients.
For u in formula (8) ij 、c i The derivative is taken to zero, and u, which minimizes the new objective function, is obtained ij 、c i ：
Figure GDA0003564827270000066
Figure GDA0003564827270000067
Given the number c of state sets, the ending threshold epsilon and the maximum iteration number, solving the equations (8) - (10) to obtain c corresponding to each state set i 、u ij The method comprises the following specific steps:
(1) for u is paired ij Carrying out initial assignment to enable the initial assignment to meet the constraint condition of a formula (7);
(2) according to c i Formula (c) calculation i ；
(3) If c is i If the variation of the iteration number is less than or equal to the ending threshold epsilon or the iteration number reaches the maximum iteration number, stopping the calculation; otherwise, utilize U ij Formula (c) calculates new u ij And (5) returning to the step (2).
Further, the step S4 includes:
when the method is used for detecting the electric connector, two state sets, namely a connection effective state and a connection poor state, are adopted, a state detection model is adopted, c1 and c2 corresponding to the connection good state and the connection poor state respectively are solved, and then corresponding probability values are obtained
Figure GDA0003564827270000071
Wherein u is effect Probability value of connection validity for the optimum contact resistance to be detected, d effect Difference between the optimum contact resistance to be detected and the expected value of the effective connection state, d fail And the difference value of the optimal contact resistance to be detected and the poor connection state is obtained.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. A method of testing an electrical connector, the method comprising:
step S1, detecting the contact resistance of the electric connector to obtain the contact resistance R corresponding to the nth detection time n ；
Step S2, the contact resistance is preprocessed to obtain the optimal contact resistance y at the nth detection time n ；
Step S3, constructing a state detection model of the electric connector;
step S4, according to the state detection model and the optimal contact resistance y n Judging whether the electric connector is in an effective connection state or a poor connection state;
the step S2 specifically comprises steps S21-S23;
step S21: sequentially acquiring four continuous detection times n-3, n-2, n-1,n contact resistance to obtain signal f n ：
Figure DEST_PATH_IMAGE002
Wherein R is t The instantaneous contact resistance of the electrical connector corresponding to time t;
step S22: definition of y 1 、y 2 、y 3 Are each equal to R 1 、R 2 、R 3 To the signal f n The following treatments were carried out:
Figure DEST_PATH_IMAGE004
wherein e is n Is a signal f n Optimum contact resistance y with the n-1 detection time n-1 Error value of, Δ e n Is e n And e n-1 A, beta is a proportionality coefficient, delta n Is the nth detection time e n Correction amount of δ n For the nth detection of the time-of-day signal f n The correction amount of (1);
step S23: when R is n ≥f n And then the optimal contact resistance at the nth detection time is as follows:
Figure DEST_PATH_IMAGE006
when R is n ＜f n And then, the optimal contact resistance at the nth detection time is as follows:
Figure DEST_PATH_IMAGE008
the step S3 specifically includes:
in step S2, the optimum contact resistance of the electrical connector is obtained, denoted as R ═ y 1 ，y 2 ，……，y n Define the objective function as:
Figure DEST_PATH_IMAGE010
and:
Figure DEST_PATH_IMAGE012
0≤u ij ≤1，1≤i≤c，1≤j≤n，d ij ＝||y j -c i ||
wherein u is ij Probability value for the jth optimum contact resistance belonging to the ith state set, c i C is the number of state sets, and m is a preset constant, as the desired quantity of the ith state set corresponding to the optimal contact resistance;
to ensure that the objective function can be solved, a new objective function is defined:
Figure DEST_PATH_IMAGE014
wherein, γ j Is an indeterminate coefficient;
for u is paired ij 、c i The derivative is taken and made zero, and u, which minimizes the new objective function, is obtained ij 、c i ：
Figure DEST_PATH_IMAGE016
Figure DEST_PATH_IMAGE018
Obtaining c corresponding to each state set according to the given state set number c, the ending threshold epsilon and the maximum iteration number i 、u ij 。
2. The method of claim 1, wherein the step of inspecting the electrical connector comprises inspecting the electrical connectorThen, according to the given state set number c, the ending threshold epsilon and the maximum iteration number, c corresponding to each state set is obtained i 、u ij The method comprises the following specific steps:
(1) for u is paired ij Performing initial assignment;
(2) according to c i Of calculation formula c i ；
(3) If c is i If the variation of the iteration number is less than or equal to the ending threshold epsilon or the iteration number reaches the maximum iteration number, stopping the calculation; otherwise, utilize U ij Formula (c) calculates new u ij And (3) returning to the step (2).
3. The method for detecting an electrical connector according to claim 1, wherein the step S1 includes:
step S11: using A/D chip to conduct instantaneous current I through electric connector t And instantaneous voltage U across the electrical connector t Detecting to obtain a current detection signal I at the nth detection time n Voltage detection signal U n ；
Step S12: based on the current detection signal I n Voltage detection signal U n Calculating the contact resistance R corresponding to the nth detection time n 。
4. The method as claimed in claim 3, wherein the step S12 is specifically:
instantaneous current I t Instantaneous voltage U t The relationship of (1) is:
Figure DEST_PATH_IMAGE020
wherein L corresponds to an equivalent inductance of the electrical connector, the equivalent inductance L being obtained from a data manual of the electrical connector;
discretizing and transforming to obtain contact resistance
Figure DEST_PATH_IMAGE022
Where Δ t is the detection period.
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CN103968937B (en) * 2014-05-09 2017-12-26 国网福建晋江市供电有限公司 A kind of distribution switch mechanical state diagnostic method based on EMD Sample Entropies and FCM
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