CN106324040B - Detection early warning device and method - Google Patents
Detection early warning device and method Download PDFInfo
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- CN106324040B CN106324040B CN201610863977.5A CN201610863977A CN106324040B CN 106324040 B CN106324040 B CN 106324040B CN 201610863977 A CN201610863977 A CN 201610863977A CN 106324040 B CN106324040 B CN 106324040B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/028—Circuits therefor
Abstract
The invention provides a brand-new concentric ring-shaped bonding pad, wherein the concentric ring-shaped bonding pads form a concentric ring-shaped bonding pad array, the bonding pad spacing of the concentric ring-shaped bonding pads can be flexibly set, and a detection blind area which is caused by no growth in a specific direction and causes creeping corrosion can be avoided; the invention adopts a controllable periodic power supply device, namely a discontinuous measurement mode, so that the influence of the problems of electromigration and the like caused by long-term energization on the measurement of the insulation impedance of the concentric ring-shaped bonding pad is avoided; the insulation impedance of the concentric ring-shaped bonding pad is measured by adopting an insulation impedance detection network capable of measuring in a grading way, so that insulation impedance change with larger dynamic range is measured and recorded, and the continuous detection of the severity of crawling corrosion of the printed circuit board is realized; because the pad spacing can be flexibly set, concentric ring-shaped pad groups with different pad spacing can be measured, and the creeping distance of creeping corrosion can be measured.
Description
Technical Field
The invention relates to the technical field of crawling corrosion of printed circuit boards, in particular to a detection early warning device and a detection early warning method.
Background
Along with the continuous development of science and technology, electronic products are widely applied to the fields of daily life, work, industry and the like of people at present, and become an indispensable part of life of people.
However, under the environment that the humidity of the printed circuit board of the electronic product is higher (generally more than 60%) and the environment contains sulfur gas or dust, the creep corrosion on the printed circuit board is caused with higher probability, wherein the creep corrosion refers to the process that corrosion products migrate and grow from the surface of the copper pad of the printed circuit board along with the increase of the corrosion severity in the environment that an electric field is not needed, and the phenomenon can lead to the decrease of insulation resistance between adjacent circuits of the printed circuit board and finally cause the short circuit failure between the circuits.
At present, the judgment of the crawling corrosion of the printed circuit board mainly comprises two means, namely, the method is used for deducing whether the crawling corrosion is possible or not by measuring pollutants in the air, and the main means are chemical analysis and reaction detection, but the method cannot directly give out a direct indication of whether the pollution level is serious enough to cause the crawling corrosion or not; secondly, by utilizing the silver-immersed comb-shaped bonding pad with fixed size treated by the soldering flux, whether the field environment has pollutants which cause crawling corrosion or not is detected, but the method only judges the pollutant level of the field environment, and the crawling distance and the severity of crawling corrosion cannot be continuously measured.
Disclosure of Invention
In order to solve the problems, the invention provides a detection and early warning device and a detection and early warning method, which are applied to detection of crawling corrosion of a printed circuit board.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a detection early warning device for detection of creep corrosion of a printed circuit board, the detection early warning device comprising:
a concentric ring-shaped pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
the concentric annular bonding pad array is formed by connecting concentric annular bonding pads with the same bonding pad spacing in parallel to form concentric annular bonding pad groups, and grouping and arranging the concentric annular bonding pad groups with the same bonding pad spacing;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
the concentric ring-shaped pad array, the controllable period power supply device and the insulation impedance detection network capable of measuring in a grading manner are connected in series; the controllable periodic power supply device controls the insulation impedance detection network capable of carrying out step measurement, and the concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array are sequentially measured.
Preferably, in the detection and early warning device, the concentric ring-shaped pad is a concentric ring-shaped pad made of a copper-containing material.
Preferably, in the above detection and early warning device, the concentric ring-shaped pad group includes 3 to 5 concentric ring-shaped pads having the same pad pitch.
Preferably, in the detection early warning device, the insulation resistance detection network capable of step measurement includes:
an insulation impedance detection circuit and a singlechip; the insulation impedance detection circuit is connected with the concentric ring-shaped pad array and the controllable period power supply device in series; one end of the singlechip is connected with the insulation impedance detection circuit; the other end of the singlechip is connected with the controllable period power supply device.
Preferably, in the detection and early warning device, the insulation resistance detection circuit includes:
detecting a resistor selection switch; the detection resistor selection switch is used for selecting different detection resistors for detection.
Preferably, in the detection and early warning device, the pad pitch is 4mil or 8mil or 12mil or 16mil or 20mil.
The invention also provides a detection and early warning method applied to detection of crawling corrosion of the printed circuit board, which comprises the following steps:
providing a concentric annular pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
connecting the concentric ring-shaped bonding pads with the same bonding pad spacing in parallel to form a concentric ring-shaped bonding pad group, and forming the concentric ring-shaped bonding pad group with the same bonding pad spacing into a concentric ring-shaped bonding pad array;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
connecting the concentric ring-shaped pad array, the controllable periodic power supply device and the insulation impedance detection network capable of measuring in a grading manner in series;
during measurement, the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading mode to sequentially measure concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array.
Preferably, in the above method, the controllable periodic power supply device is configured to supply power when in operation, and stop supplying power when not in operation; and the controllable periodic power supply device is used for selectively supplying power to the concentric annular bonding pad groups with different bonding pad pitches.
Preferably, in the above method, in the measuring, the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in steps to sequentially measure concentric annular pad groups with different pad pitches in the concentric annular pad array, including:
the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading manner to sequentially perform periodic measurement on concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array, records the insulation impedance of a measurement result, judges the severity of crawling corrosion of the printed circuit board according to the reduction degree of the insulation impedance of the measurement result, and judges the growth trend of crawling corrosion according to data analysis.
As can be seen from the above description, the detection and early warning device provided by the present invention is applied to detection of creep corrosion of a printed circuit board, and the detection and early warning device includes: a concentric ring-shaped pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring; defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches; the concentric annular bonding pad array is formed by connecting concentric annular bonding pads with the same bonding pad spacing in parallel to form concentric annular bonding pad groups, and grouping and arranging the concentric annular bonding pad groups with the same bonding pad spacing;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
the concentric ring-shaped pad array, the controllable period power supply device and the insulation impedance detection network capable of measuring in a grading manner are connected in series; the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading mode to sequentially measure concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array.
In combination with the background technology, at present, two main means are used for judging the crawling corrosion of the printed circuit board, namely, whether the crawling corrosion is possible or not is inferred by measuring pollutants in the air, and the main means are chemical analysis and reaction detection, but the method cannot directly give a direct indication of whether the pollution level is serious enough to cause the crawling corrosion or not; secondly, by utilizing the silver-immersed comb-shaped bonding pad with fixed size treated by the soldering flux, whether the field environment has pollutants which cause crawling corrosion or not is detected, but the method only judges the pollutant level of the field environment, and the crawling distance and the severity of crawling corrosion cannot be continuously measured.
The invention provides a brand-new concentric ring-shaped bonding pad, wherein the concentric ring-shaped bonding pads form a concentric ring-shaped bonding pad array, and the bonding pad spacing of the concentric ring-shaped bonding pads can be flexibly set, so that a detection blind area which is caused by no growth in a specific direction and causes creeping corrosion can be avoided; the invention adopts a controllable periodic power supply device, namely a discontinuous measurement mode, so that the problems of electromigration and the like caused by long-term power on are avoided, and the insulation resistance of the concentric ring-shaped bonding pad is further measured; and the insulation impedance of the concentric ring-shaped bonding pad is measured by adopting an insulation impedance detection network capable of measuring in a grading way, so that insulation impedance change with a larger dynamic range is measured and recorded, and the continuous detection of the severity of crawling corrosion of the printed circuit board is realized. Because the pad spacing can be flexibly set, the concentric annular pad groups with different pad spacing can be measured, and the crawling distance of crawling corrosion can be measured through data analysis.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a concentric ring pad according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a concentric ring-shaped pad group according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a concentric ring pad array according to an embodiment of the present disclosure;
FIG. 4 is a system frame diagram of a device for detecting and warning creep corrosion of a printed circuit board according to an embodiment of the present application;
FIG. 5 is a system frame diagram of another apparatus for detecting and warning creep corrosion of a printed circuit board according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an insulation resistance detection circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the background technology, at present, two main means are available for judging the crawling corrosion of the printed circuit board, namely, whether the crawling corrosion is possible or not is inferred by measuring pollutants in the air, and the main means are chemical analysis and reaction detection, but the method cannot directly give a direct indication of whether the pollution level is serious enough to cause the crawling corrosion or not; secondly, by utilizing the silver-immersed comb-shaped bonding pad with fixed size treated by the soldering flux, whether the field environment has pollutants which cause crawling corrosion or not is detected, but the method only judges the pollutant level of the field environment, and the crawling distance and the severity of crawling corrosion cannot be continuously measured.
In order to solve the above problems, an embodiment of the present invention provides a detection and early warning device applied to detection of creep corrosion of a printed circuit board, the detection and early warning device includes:
a concentric ring-shaped pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
the concentric annular bonding pad array is formed by connecting concentric annular bonding pads with the same bonding pad spacing in parallel to form concentric annular bonding pad groups, and grouping and arranging the concentric annular bonding pad groups with the same bonding pad spacing;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
the concentric ring-shaped pad array, the controllable period power supply device and the insulation impedance detection network capable of measuring in a grading manner are connected in series; the controllable periodic power supply device controls the insulation impedance detection network capable of carrying out step measurement, and the concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array are sequentially measured.
As can be seen from the above description, the present invention provides a new concentric ring-shaped bonding pad, where the concentric ring-shaped bonding pads form a concentric ring-shaped bonding pad array, and the bonding pad pitches of the concentric ring-shaped bonding pads can be flexibly set, so that a detection blind area that no specific direction grows to cause creeping corrosion can be avoided; the invention adopts a controllable periodic power supply device, namely a discontinuous measurement mode, so that the problems of electromigration and the like caused by long-term power on are avoided, and the insulation resistance of the concentric ring-shaped bonding pad is further measured; and the insulation impedance of the concentric ring-shaped bonding pad is measured by adopting an insulation impedance detection network capable of measuring in a grading way, so that insulation impedance change with a larger dynamic range is measured and recorded, and the continuous detection of the severity of crawling corrosion of the printed circuit board is realized. Because the pad spacing can be flexibly set, the concentric annular pad groups with different pad spacing can be measured, and the crawling distance of crawling corrosion can be measured through data analysis.
For a more detailed description of embodiments of the present invention, reference is made to the accompanying drawings.
Referring to fig. 1, fig. 2 and fig. 3, an embodiment of the present invention provides a detection and early warning device applied to detection of creep corrosion of a printed circuit board, the detection and early warning device includes:
a concentric ring-shaped pad array 31; the concentric annular pad array 31 is composed of the concentric annular pads 11; the concentric ring pad 11 includes: an inner ring 12, an intermediate ring 13 and an outer ring 14; the distance between the inner ring 12 and the intermediate ring 13 is equal to the distance between the intermediate ring 13 and the outer ring 14;
in the concentric ring pad 11, the widths of the inner ring 12, the intermediate ring 13 and the outer ring 14 are 20mil, but the widths may be set according to practical situations. The concentric ring-shaped pad 11 is a concentric ring-shaped pad made of a copper-containing material.
Defining a distance between the inner ring 12 and the intermediate ring 13 and a distance between the intermediate ring 13 and the outer ring 14 as a pad pitch 15;
in the present application, the pad pitch 15 is 4mil or 8mil or 12mil or 16mil or 20mil, but is not limited, and the pad pitch 15 may be set according to practical situations, so that a detection blind area that no growth in a specific direction causes creeping corrosion may be avoided.
Referring to fig. 3, the concentric ring-shaped pad array 31 connects in parallel the concentric ring-shaped pads 11 of the same pad pitch 15 as the concentric ring-shaped pad group 21, and arranges the concentric ring-shaped pad groups 21 of the same pad pitch 15 in groups;
that is, referring to fig. 2, fig. 2 shows the concentric annular land group 21, and in the embodiment of the present application, the concentric annular land group 21 includes, but is not limited to, 3 to 5 concentric annular lands 11 having the same land pitch 15. The concentric annular pads 11 in the concentric annular pad group 21 are connected in parallel.
Subsequently, the concentric annular pads 11 of the same pad pitch 15 are grouped, and the concentric annular pad group 21 forms the concentric annular pad array.
Referring to fig. 4, a controllable periodic power supply, 41; the controllable period power supply device 41 is used for supplying power when in operation and stopping supplying power when not in operation; and said controllable period powering means 41 are adapted to select powering of different ones of said concentric annular pad sets 21.
The controllable periodic power supply 41 can avoid the generation of problems such as electromigration caused by long-time power supply, thus making the measurement result inaccurate.
A step-measurable insulation resistance detection network 42; the insulation resistance detection network 42 capable of measuring in steps can measure and record insulation resistance changes with larger dynamic range, and continuous detection of severity of crawling corrosion of the printed circuit board is realized.
It should be noted that fig. 4 illustrates that one of the concentric ring pads is detected, and in practical cases, the concentric ring pad array 31 is connected in a circuit. Wherein the concentric circular ring-shaped pad array 31 and the controllable-period power supply 41 are connected in series with the scalable insulation resistance detection network 42; the controllable period power supply 41 controls the insulation resistance detection network 42 capable of measuring in steps to sequentially measure different concentric ring-shaped pad groups 21 in the concentric ring-shaped pad array 31.
That is, in the present embodiment, the scalable insulation resistance test network 42 sequentially measures the concentric annular land group 21 with the land pitches 15 of 4mil,8mil,12mil,16mil,20 mil.
Since the pad pitches 15 can be flexibly set, the measurement of the concentric ring pad group 21 of different pad pitches 15 can determine the growth distance of creep corrosion.
Referring to fig. 5, the scalable insulation resistance detection network 42 includes:
an insulation resistance detection circuit 51 and a singlechip 52; the insulation resistance detection circuit 51 and the concentric ring-shaped pad array 31 are connected in series with the controllable period power supply 41; one end of the singlechip 52 is connected with the insulation impedance detection circuit 51; the other end of the singlechip 52 is connected with the controllable period power supply device 41.
Referring to fig. 6, the insulation resistance detection circuit 51 includes:
a detection resistance selection switch 61; the detection resistor selection switch 61 is used for selecting different detection resistors for detection.
The single chip microcomputer 52 is used for collecting the voltage signals on the detection resistor, processing the voltage signals and then storing and recording the voltage signals, wherein the detection resistor selects different gears to measure according to different input current, so that when the dynamic range of the impedance of the concentric ring-shaped bonding pad 11 is changed greatly, the single chip microcomputer 52 can effectively collect data, and according to the voltage signals collected by the single chip microcomputer 52, the corresponding impedance value of the concentric ring-shaped bonding pad 11 can be obtained. By recording the impedance value and the time point, the change trend and the change time of the impedance of the concentric ring-shaped bonding pad 11 under the influence of the creep corrosion can be clearly observed, so that the device can be used for detecting the occurrence of the creep corrosion.
In practical cases, the detection and early warning device is arranged in the cabinet where the system clamping piece is located when in operation, so that the consistency of surrounding environments is ensured.
For example, when the concentric ring pad receives the influence of creeping corrosion, the impedance of the concentric ring pad 11 drops to a certain value (1 gΩ), as shown in fig. 6, the singlechip 52 samples the voltage on the 5M resistor, records and stores the corresponding resistance value and time, when the impedance of the concentric ring pad 11 drops to 100mΩ, the singlechip 52 controls the detection resistor selection switch 61, the singlechip 52 samples the voltage on the resistor between 5M and 680K, records and stores the corresponding resistance value and time, and generates a corresponding early warning signal when the impedance of the concentric ring pad 11 drops to 1mΩ.
In the embodiment of the present application, it is preferable that the impedance of the concentric ring pad 11 is detected from 1gΩ to 100K, and other impedance changes may be detected, with inaccurate results.
Because the resistance of the concentric ring-shaped bonding pad 11 will change along with a certain factor, resulting in inaccurate measurement results, in order to avoid the phenomena of electromigration and the like caused by long-time power-on, the singlechip 52 is connected with the controllable periodic power supply 41, and the singlechip 52 controls the controllable periodic power supply 41 to be periodically turned on and off for working, so that the measurement results are not influenced by long-time power-on.
Alternatively, the measurement is performed once every hour, the measurement duration is 10 minutes, and the singlechip 52 controls the turn-off and turn-on of the controllable periodic power supply 41 through a timing period. When the detection is started again, the 5M resistor is selected to perform impedance measurement on the concentric ring-shaped bonding pad 11, the singlechip 52 judges the impedance value on the concentric ring-shaped bonding pad 11, and when the impedance value on the concentric ring-shaped bonding pad 11 is smaller than 100MΩ, the singlechip 52 triggers the detection resistor selection switch 61 to select the resistor between 5M and 680K to perform impedance measurement.
The controllable period power supply device 41 may also be directly controlled by a microprocessor.
The invention also provides a detection and early warning method applied to the detection of the crawling corrosion of the printed circuit board, which is characterized by comprising the following steps:
providing a concentric annular pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
connecting concentric ring-shaped bonding pads with the same bonding pad spacing in parallel to form a concentric ring-shaped bonding pad group, so as to form the concentric ring-shaped bonding pad array;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
connecting the concentric ring-shaped pad array, the controllable periodic power supply device and the insulation impedance detection network capable of measuring in a grading manner in series;
during measurement, the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading mode to sequentially measure different concentric annular bonding pad groups in the concentric annular bonding pad array.
The controllable periodic power supply device is used for supplying power when working and stopping supplying power when not working; and the controllable periodic power supply device is used for selectively supplying power to different concentric ring-shaped bonding pad groups.
When in measurement, the controllable period power supply device controls the insulation impedance detection network capable of measuring in a grading way to sequentially measure different concentric ring-shaped bonding pad groups in the concentric ring-shaped bonding pad array, and the method comprises the following steps:
the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading manner to sequentially measure the periodicity of different concentric ring-shaped bonding pad groups in the concentric ring-shaped bonding pad array, record the insulation impedance of a measurement result, judge the severity of crawling corrosion of the printed circuit board according to the reduction degree of the insulation impedance of the measurement result, and judge the growth trend of crawling corrosion according to data analysis.
Because the pad spacing can be flexibly set, the growth distance of creeping corrosion can be determined by measuring the concentric ring pad groups with different pad spacing.
It should be noted that, the detection of the creep corrosion of the printed circuit board by the insulation impedance detection network capable of being measured in steps adopted in the invention is only one preferred method, and is not limited to the method, and the insulation impedance detection circuit is also only one implementation method of the grouping detection network, and is not limited to the detection of the creep corrosion of the printed circuit board by the detection circuit, and other methods for detecting the creep corrosion of the printed circuit board are also within the protection scope of the invention.
In combination with the background technology, at present, two main means are used for judging the crawling corrosion of the printed circuit board, namely, whether the crawling corrosion is possible or not is inferred by measuring pollutants in the air, and the main means are chemical analysis and reaction detection, but the method cannot directly give a direct indication of whether the pollution level is serious enough to cause the crawling corrosion or not; secondly, by utilizing the silver-immersed comb-shaped bonding pad with fixed size treated by the soldering flux, whether the field environment has pollutants which cause crawling corrosion or not is detected, but the method only judges the pollutant level of the field environment, and the crawling distance and the severity of crawling corrosion cannot be continuously measured.
As can be seen from the above description, the present invention provides a new concentric ring-shaped bonding pad, where the concentric ring-shaped bonding pads form a concentric ring-shaped bonding pad array, and the bonding pad pitches of the concentric ring-shaped bonding pads can be flexibly set, so that a detection blind area that no specific direction grows to cause creeping corrosion can be avoided; the invention adopts a controllable periodic power supply device, namely a discontinuous measurement mode, so that the problems of electromigration and the like caused by long-term power on are avoided, and the insulation resistance of the concentric ring-shaped bonding pad is further measured; and the insulation impedance of the concentric ring-shaped bonding pad is measured by adopting an insulation impedance detection network capable of measuring in a grading way, so that insulation impedance change with a larger dynamic range is measured and recorded, and the continuous detection of the severity of crawling corrosion of the printed circuit board is realized. Because the pad spacing can be flexibly set, the concentric annular pad groups with different pad spacing can be measured, and the crawling distance of crawling corrosion can be measured through data analysis.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a detect early warning device, is applied to the detection of printed circuit board creep corrosion, a serial communication port, detect early warning device includes:
a concentric ring-shaped pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
the concentric annular bonding pad array is formed by connecting concentric annular bonding pads with the same bonding pad spacing in parallel to form concentric annular bonding pad groups, and grouping and arranging the concentric annular bonding pad groups with the same bonding pad spacing;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
the concentric ring-shaped pad array, the controllable period power supply device and the insulation impedance detection network capable of measuring in a grading manner are connected in series; the controllable periodic power supply device controls the insulation impedance detection network capable of carrying out step measurement, and the concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array are sequentially measured.
2. The detection and early warning device according to claim 1, wherein the concentric ring-shaped pad is a concentric ring-shaped pad made of a copper-containing material.
3. The inspection and pre-warning device according to claim 1, wherein the concentric ring-shaped pad group includes 3 to 5 concentric ring-shaped pads of the same pad pitch.
4. The detection and early warning device according to claim 1, characterized in that the insulation resistance detection network capable of step-measuring comprises:
an insulation impedance detection circuit and a singlechip; the insulation impedance detection circuit is connected with the concentric ring-shaped pad array and the controllable period power supply device in series; one end of the singlechip is connected with the insulation impedance detection circuit; the other end of the singlechip is connected with the controllable period power supply device.
5. The detection and early warning device according to claim 4, wherein the insulation resistance detection circuit includes:
detecting a resistor selection switch; the detection resistor selection switch is used for selecting different detection resistors for detection.
6. The detection and early warning device according to claim 1, wherein the pad pitch is 4mil or 8mil or 12mil or 16mil or 20mil.
7. The method for detecting and early warning is applied to detection of crawling corrosion of a printed circuit board, and is characterized by comprising the following steps:
providing a concentric annular pad array; the concentric ring-shaped bonding pad array consists of the concentric ring-shaped bonding pads; the concentric ring pad includes: an inner ring, an intermediate ring, and an outer ring; the distance between the inner ring and the middle ring is equal to the distance between the middle ring and the outer ring;
defining a distance between the inner ring and the intermediate ring and a distance between the intermediate ring and the outer ring as pad pitches;
connecting the concentric ring-shaped bonding pads with the same bonding pad spacing in parallel to form a concentric ring-shaped bonding pad group, and forming the concentric ring-shaped bonding pad group with the same bonding pad spacing into a concentric ring-shaped bonding pad array;
a controllable periodic power supply;
an insulation resistance detection network capable of being measured in steps;
connecting the concentric ring-shaped pad array, the controllable periodic power supply device and the insulation impedance detection network capable of measuring in a grading manner in series;
during measurement, the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading mode to sequentially measure concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array.
8. The method of claim 7, wherein the controllable periodic power supply is configured to provide power during operation and to cease power during non-operation; and the controllable periodic power supply device is used for selectively supplying power to the concentric annular bonding pad groups with different bonding pad pitches.
9. The method of claim 7, wherein the controllable periodic power supply controlling the step-wise measurable insulation resistance test network to sequentially measure concentric annular land groups of different land pitches in the concentric annular land array comprises:
the controllable periodic power supply device controls the insulation impedance detection network capable of measuring in a grading manner to sequentially perform periodic measurement on concentric annular bonding pad groups with different bonding pad pitches in the concentric annular bonding pad array, records the insulation impedance of a measurement result, judges the severity of crawling corrosion of the printed circuit board according to the reduction degree of the insulation impedance of the measurement result, and judges the growth trend of crawling corrosion according to data analysis.
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| CN201610863977.5A CN106324040B (en) | 2016-09-29 | 2016-09-29 | Detection early warning device and method |
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