CN108802526A - A kind of modeling method of coaxial connector electrical contact impedance operator deterioration law - Google Patents
A kind of modeling method of coaxial connector electrical contact impedance operator deterioration law Download PDFInfo
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- CN108802526A CN108802526A CN201810580875.1A CN201810580875A CN108802526A CN 108802526 A CN108802526 A CN 108802526A CN 201810580875 A CN201810580875 A CN 201810580875A CN 108802526 A CN108802526 A CN 108802526A
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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
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Abstract
The invention discloses a kind of coaxial connector be in electrical contact impedance operator deterioration law modeling method, the method includes：(1) it proposes a kind of experimental method of coaxial connector electrical contact impedance operator deterioration law, includes mainly：1, a kind of contact degeneration accelerated test method of coaxial connector is proposed；2, a kind of testing impedance scheme of coaxial connector is proposed.(2) modeling method for proposing a set of coaxial connector impedance operator deterioration law includes mainly：1, a coaxial connector electrical contact failure impedance model is established；2, model parameter and its deterioration law under different degree of degenerations is calculated, and proves the accuracy of model from the angle of Physical Mechanism.The present invention uses the method that experiment test and theory analysis are combined, form the modeling method of a set of comprehensive analysis coaxial connector electrical contact impedance operator deterioration law, this method all kinds of coaxial connectors suitable for communication system, and new reference index can be provided for the fault verification of connector.
Description
Technical field
The present invention relates to connector design, application field and telecommunication circuit field more particularly to a kind of coaxial connectors
The experiment test and theoretical analysis method of impedance operator changing rule caused by electrical contact is degenerated.
Background technology
Coaxial connector is one kind of communications connector, is widely used in communication system, realizes the signal of intermodule
Transmission and energy transmission.One basic coaxial connector includes shell (outer conductor), insulator and connector (inner wire).Even
The mode of connecing is divided into screw connected, push-in, self-locking etc..Three component parts of connector have respectively different important works
With the failure of different parts can influence the reliability of connector.
It is found in indoor reliability detection is examined and tested to the tail of assembly producing line, the failure conditions of electric connector are main
Have several：Impurity adherency, poor contact, defective insulation, elastic parts across fall or be broken, misplug pull out, installation dimension is not inconsistent, assembles
Error etc. can also be summarized as contact failure, failure of insulation, mechanical connection failure.According to previous research, be actually engaged in it is big
It can be found that being contacted in three kinds of failure modes of connector in the customer complaint analysis generated after amount reliability test experience and delivery
Failure accounts for 45.1% always to fail.Cause the factor that connector contact fails very much, in addition to artificial maloperation, environmental pollution and corruption
The influence of erosion is the main reason for leading to its failure.
Due to influences such as manufacturing process, actual connector electrical contact surface is not ideal smooth flat, is actually connect
Contacting surface product will be much smaller than apparent contact area, and connector easily it is affected by environment cause contact surface to be degenerated, in DC case
Under be embodied in the raising of contraction protein and film layer resistance.However in frequency applications, due to Kelvin effect, closer conductive surface electricity
Current density is bigger, and therefore, in contact interface and not all contact (area) pattern is all by electric current, and Kelvin effect makes effective electricity of conductor
Resistance increases.Meanwhile electric current also has the displacement electricity by pollutant and relief area in addition to being conducted by metal contact
Stream.Due to the presence of the factors such as the roughness of contact surface and superficial film, hand capacity can be generated in contact surface.In addition,
In high frequency, since the effects such as contraction of electric current caused by the presence of electrical contact and its degradation phenomena of contact surface are also led to
The generation of inductance.Due to influences such as Kelvin effects, the contact resistance, capacitance and inductance change with the variation of frequency, each to hinder
The complicated variation of anti-parameter is the main reason for causing connector high frequency performance to be degenerated, and is that connector is caused to become communication system
In the main reason for being difficult to malfunction elimination position, these influences cannot absolutely be ignored in high frequency communication circuits.Therefore, it grinds
It is that the current communications field is paid close attention to and urgently to be resolved hurrily asked to study carefully the impedance operator changing rule in coaxial connector degenerative process
Topic, the research of the problem for the type selecting of connector, design, health forecast management and the accident analysis of entire communication system and
Investigation all has highly important application prospect and practical value.
In previous research work, every experts and scholars in the field mainly illustrate that connector connects from theory analysis angle
Get an electric shock resistance, capacitance, inductance mechanism of production, not using actual connector as research object to its theoretical progress experimental verification,
And the impedance operator changing rule of connector when not studying different degree of degenerations.In order to more comprehensively study coaxial connector
Impedance effect changing rule caused by degenerating, it is necessary to design a set of accurately experimental test procedures and comprehensive theory analysis side
Method.
Invention content
In view of the above-mentioned drawbacks of the prior art, the present invention is based on two levels of experiment test and theory analysis to propose one
The modeling method of kind coaxial connector electrical contact impedance operator deterioration law, it is intended to accurately measure coaxial connector contact surface
Impedance effect and its variation relation with frequency caused by degenerating, and its each impedance parameter (resistance, electricity is obtained by theoretical calculation
Hold, inductance) changing rule with degree of degeneration and the changing rule with frequency.The research method includes：
A kind of modeling method of coaxial connector electrical contact impedance operator deterioration law, includes the following steps：
(1) the criterion simulation for being based on " inessential factor is as much as possible avoided to influence " makes different contact degree of degenerations
Coaxial connector, using brand-new connector from the connector of different degree of degenerations as sample to be tested；
(2) test fixture is made, selects impedance analyzer to measure brand-new connector respectively coaxial under different degree of degenerations
The impedance magnitude and phase angle of connector, and its variation relation with frequency；
(3) the electrical contact failure impedance model of a coaxial connector is established；Based on electrical contact failure impedance model and step
Suddenly the experimental results of (2) obtain it is a kind of electrical contact impedance parameter computational methods, be calculated brand-new connector from it is different
The contact impedance parameter of coaxial connector under degree of degeneration, to obtain complete electrical contact failure impedance model.
Wherein, sample to be tested is selected as female and female turn of female coaxial connector of a pair of of revolution in step (1).
Wherein, the criterion simulation making difference based on " inessential factor is as much as possible avoided to influence " connects in step (1)
Touch degree of degeneration coaxial connector be specially：Mother turns the female part rubber sleeve in female connectors and revolution female connectors
It protects and winds polytetrafluoroethylene (PTFE) without accelerating degradation simulation, only male part, that is, contact pin in revolution female connectors is carried out
Accelerate to degenerate, then turns female connectors combination with corresponding mother.
Wherein, acceleration, which is degenerated, is specially：The male part of all revolution female connectors is exposed to a concentration of 69% nitre
In acid vapor, at interval of a part is taken out after a period of time, to simulate the faulty connector of different degree of degenerations.
Wherein, test fixture is made in step (2) is specially：It needs to select to press from both sides according to the size and shape of tested sample
Tool, is improved inappropriate fixture, to be suitable for tested sample, for the lead portion having more, using identical lead school
Quasi- method removes its influence.
Wherein, established in step (3) coaxial connector electrical contact failure impedance model be specially：Brand-new a pair is coaxial
Connector is equivalent to the series model of a resistance and inductance, and the coaxial connector sample after failure is equivalent in original resistance
It connects with inductance with a resistance is increased in the series circuit of inductance, then the impedance network in parallel with capacitance.
Wherein, based on impedance model and experimental results obtain it is a kind of electrical contact impedance parameter computational methods it is specific
For：Based on impedance model and experimental measurements, it is real that actual measurement impedance value is equal to according to the impedance value real part that model is calculated
The impedance value imaginary part in portion, calculating is equal to actual measurement impedance value imaginary part, obtains two equations under each frequency point, it is assumed that under adjacent two frequency point
Resistance, capacitance and inductance value it is equal, be to solve one group of resistance, capacitance and the electricity of the frequency according to the equation under adjacent two frequency point
Inductance value calculates different degree of degenerations, the equivalent resistance of different frequency lower connector, capacitance and inductance value in this way.
Compared with the prior art, the present invention has the following advantages：
1) methods of experiments of impedance effect caused by connector electrical contact is degenerated is given；
2) impedance operator changing rule carries out caused by being in electrical contact degeneration to it using actual connector as research object
Research；
3) contact impedance equivalent-circuit model is established, and gives the extracting method of impedance parameter.
Description of the drawings
Fig. 1 is the overall technology route map of the embodiment of the present invention；
Fig. 2 is that the coaxial connector of the embodiment of the present invention is in electrical contact the flow chart of degradation simulation method；
Fig. 3 is the impedance model of the failure coaxial connector of the embodiment of the present invention；
Fig. 4 is the coaxial connector impedance test device figure of the embodiment of the present invention；
Fig. 5 be the embodiment of the present invention brand-new and different degree of degeneration coaxial connector impedance magnitude and phase angle with frequency
The variation relation of rate；
Fig. 6 is the brand-new coaxial connector equivalent resistance and equivalent inductance of the embodiment of the present invention；
Fig. 7 is impedance parameter of the 9 pairs of faulty connectors of the embodiment of the present invention under different frequent points.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, below in conjunction with attached drawing and specific implementation
The present invention is described in more detail for example.
The overall technology route of embodiment of the present invention rule as shown in Figure 1, coaxial connector electrical contact impedance operator is degenerated
The research method of rule.Specific embodiment is divided into four big steps：
Step 1) coaxial connector electrical contact degradation simulation：
The flow chart of the coaxial connector failure simulation method of the embodiment of the present invention, as shown in Fig. 2, concrete scheme is：
S101：Brand-new 5 SMA revolution female connectors and 5 matched mothers SMA are turned into female connectors by 1- respectively
5 labels are denoted as A groups；Other 9 SMA revolution female connectors and 9 matched mothers SMA are turned female connectors and marked by 1-9
Number, it is denoted as B groups.
S102：The female part of all SMA revolution female connectors of label 1-9 in B groups is put on into rubber sleeve, and is wound poly-
Tetrafluoroethene adhesive tape, all mothers SMA turn female connectors and are not processed；
S103：Upward by the SMA handled well revolution female connectors male part, it every 3 one group, is placed on culture dish；It is accurate
A standby clean glass desicator, interface smear stop-leak compound, and bottom is put into the concentrated nitric acid of 250mL a concentration of 69%, and frame is good
Connector mounted culture dish is placed on articles holding table and (pays attention to carrying out with anticorrosion gloves and glasses, mask by ceramic articles holding table
Operation)；
S104：The connector sample marked as 1-3 is taken out after 1 hour；The connector sample marked as 4-6 is taken out after 2 hours
This；The connector sample marked as 7-9 is taken out after 3 hours, and the polytetrafluoroethylene (PTFE) adhesive tape and rubber sleeve of all samples are torn open
It removes；
S105：9 connectors are put into 125 degree of sweat box and are dried 30 minutes；
S106：It places 30 minutes at room temperature, connector is made to be restored to room temperature, observation degeneration surface, wherein accelerating degeneration 1,2
The connector surface polluted membrane of hour is relatively thin, and film layer is thicker within 3 hours, almost without metal slit；
S107：The careful SMA revolution female connectors by corresponding label and mother SMA turn female connectors and combine to get to two
9 faulty connector samples of kind pollution level.
Step 2) test of coaxial connector impedance effect：
The coaxial connector impedance effect testing scheme of the embodiment of the present invention is as follows：
1. by shown in step S101 that SMA revolution is female and mother turns female connectors label, the SMA that then will correspond to label revolves round the sun
Female connectors turn female connectors with mother and combine, and obtain 5 pairs of fault-free connector samples；
2. selecting fixture according to the size of tested sample and shape, inappropriate fixture is improved, to be suitable for quilt
Test sample sheet removes its influence for the lead portion having more using identical lead calibration method.
3. method carries out impedance effect test to different samples as shown in Figure 4, by measure respectively obtain it is brand-new and not
Coaxial connector impedance magnitude and phase angle with degree of degeneration is with the variation relation of frequency, and the results are shown in Figure 5.
Step 3) establish coaxial connector electrical contact degeneration impedance model：
It is as shown in Figure 3 that coaxial connector electrical contact degeneration impedance model is established based on Electric contact theory and Circuit theory.
A pair of connectors after one male-female connector and a mother-female connectors cascade is in electrical contact failure impedance model and is specially：It is fine
New a pair of of coaxial connector is equivalent to a resistance R0With inductance L0Series model, the coaxial connector sample etc. after failure
Effect is in original R0, L0Increase a resistance R in series circuit to connect with inductance L, then the impedance network in parallel with capacitance C.
Step 4) coaxial connector electrical contact degeneration surface equiva lent impedance parameter calculating：
The coaxial connector impedance parameter of the embodiment of the present invention calculates concrete scheme：
1：5 couples of fault-free sample inner wire resistance (R in A groups are measured respectively0), inductance (L0) within the scope of frequency of use
Variation relation curve, and average, the results are shown in Figure 6；
3：Assuming that the impedance parameter (R, L, C) under adjacent two frequency point is equal, calculated separately to obtain 9 pairs of events according to impedance model
Hinder R, L, the C of sample under different frequent points, as shown in Figure 7.
4：The result of calculation of different samples is analyzed, obtains each equiva lent impedance parameter with frequency and degree of degeneration
Changing rule, and the reasonability of the interpretation result from Physical Mechanism, and then verify the accuracy of model.Each parameter is brought into
Coaxial connector is in electrical contact degeneration impedance model to obtain complete model.
The above is only a preferred embodiment of the present invention, the object, technical solutions and advantages of the present invention are carried out
It is further described, it should be understood that the foregoing is merely the preferred embodiments of the present invention, not limiting this hair
Bright, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention
Protection domain within.
Claims (7)
1. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law, which is characterized in that include the following steps：
(1) the criterion simulation for being based on " inessential factor is as much as possible avoided to influence " makes the coaxial of different contact degree of degenerations
Connector, using brand-new connector from the connector of different degree of degenerations as sample to be tested；
(2) test fixture is made, selects impedance analyzer to measure brand-new connector respectively coaxially connected under different degree of degenerations
The impedance magnitude and phase angle and impedance magnitude and phase angle of device with frequency variation relation；
(3) the electrical contact failure impedance model of coaxial connector is established；Reality based on electrical contact failure impedance model and step (2)
Test test result obtains the computational methods of electrical contact impedance parameter, and it is coaxial under different degree of degenerations that brand-new connector is calculated
The contact impedance parameter of connector, to obtain complete electrical contact failure impedance model.
2. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as described in claim 1, feature
It is, sample to be tested is selected as female and female turn of female coaxial connector of a pair of of revolution in step (1).
3. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as claimed in claim 2, feature
It is, the different contact degeneration journeys of criterion simulation making based on " inessential factor is as much as possible avoided to influence " in step (1)
The coaxial connector of degree is specially：Female part rubber sleeve during mother turns female connectors and the female connectors that revolve round the sun is protected and is twined
Around polytetrafluoroethylene (PTFE) without accelerating degradation simulation, only male part, that is, contact pin in revolution female connectors is carried out accelerating to move back
Change, then turns female connectors combination with corresponding mother.
4. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as claimed in claim 3, feature
It is, accelerating to degenerate is specially：The male part of all revolution female connectors is exposed in a concentration of 69% nitric acid vapor,
At interval of a part is taken out after a period of time, to simulate the faulty connector of different degree of degenerations.
5. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as described in claim 1, feature
It is, test fixture is made in step (2) is specially：Fixture is selected according to the size of tested sample and shape, to inappropriate
Fixture is improved, and to be suitable for tested sample, for the lead portion having more, its shadow is removed using identical lead calibration method
It rings.
6. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as described in claim 1, feature
It is, the electrical contact failure impedance model that coaxial connector is established in step (3) is specially：Brand-new a pair of of coaxial connector etc.
Effect is the series model of a resistance and inductance, and the coaxial connector after failure is equivalent to connecting in original resistance and inductance
Increase a resistance in circuit to connect with inductance, then the impedance network in parallel with capacitance.
7. a kind of modeling method of coaxial connector electrical contact impedance operator deterioration law as described in claim 1, feature
It is, the computational methods that electrical contact impedance parameter is obtained based on electrical contact failure impedance model and experimental results are specially：
Based on electrical contact failure impedance model and experimental measurements, actual measurement is equal to according to the impedance value real part that model is calculated and is hindered
The impedance value imaginary part of anti-value real part, calculating is equal to actual measurement impedance value imaginary part, obtains two equations under each frequency point, it is assumed that adjacent two
Resistance, capacitance and inductance value under frequency point is equal, is one group of resistance, electricity for solving the frequency according to the equation under adjacent two frequency point
Hold and inductance value, calculate in this way the equivalent resistance of coaxial connector under different degree of degenerations, different frequency, capacitance and
Inductance value.
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Cited By (4)
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| CN109540400A (en) * | 2018-11-29 | 2019-03-29 | 东莞市卓越鑫汽车电子科技有限公司 | The waterproof detection method of coaxial connector and the waterproof detection system of coaxial connector |
| CN111460697A (en) * | 2020-01-13 | 2020-07-28 | 北京邮电大学 | Coaxial connector passive intermodulation prediction method with different corrosion degrees |
| CN113589078A (en) * | 2021-07-28 | 2021-11-02 | 北京邮电大学 | High-frequency performance prediction method for medium degradation connector in humid environment |
| CN113625200A (en) * | 2021-08-16 | 2021-11-09 | 哈尔滨工业大学 | In-situ detection method and detection device for performance degradation of coaxial connector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109540400A (en) * | 2018-11-29 | 2019-03-29 | 东莞市卓越鑫汽车电子科技有限公司 | The waterproof detection method of coaxial connector and the waterproof detection system of coaxial connector |
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| CN111460697B (en) * | 2020-01-13 | 2023-02-28 | 北京邮电大学 | Coaxial connector passive intermodulation prediction method with different corrosion degrees |
| CN113589078A (en) * | 2021-07-28 | 2021-11-02 | 北京邮电大学 | High-frequency performance prediction method for medium degradation connector in humid environment |
| CN113625200A (en) * | 2021-08-16 | 2021-11-09 | 哈尔滨工业大学 | In-situ detection method and detection device for performance degradation of coaxial connector |
| CN113625200B (en) * | 2021-08-16 | 2024-02-13 | 哈尔滨工业大学 | In-situ detection method and detection device for performance degradation of coaxial connector |
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