CN115047318A - Method and device for identifying micro-short, computer equipment and storage medium - Google Patents
Method and device for identifying micro-short, computer equipment and storage medium Download PDFInfo
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- CN115047318A CN115047318A CN202210761106.8A CN202210761106A CN115047318A CN 115047318 A CN115047318 A CN 115047318A CN 202210761106 A CN202210761106 A CN 202210761106A CN 115047318 A CN115047318 A CN 115047318A
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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Abstract
The embodiment of the invention discloses a method and a device for identifying a micro-short, computer equipment and a storage medium, wherein a PCB comprises a network, the network comprises a circuit, and the method for identifying the micro-short comprises the following steps: the method comprises the following steps: s1, gradually increasing the voltage at the two ends of the line to a preset voltage value; s2, generating a time-varying curve of the electrical signal of the line in the step S1; s3, judging whether the electrical signal has a mutation point along the time variation curve; and S4, if the electric signal change curve has a catastrophe point, judging that the circuit has a short circuit, and thus, quickly and accurately identifying whether the circuit has the short circuit or not.
Description
Technical Field
The invention relates to the technical field of PCB testing, in particular to a method and a device for identifying micro-short, computer equipment and a storage medium.
Background
At present, network testing for the PCB is commonly called two-wire testing, and can only measure the conventional O/S (Open-Short Test, IC Open Short circuit Test). The four-wire test of the PCB can measure the resistance of each network by four wires under the condition that the thickness of copper and the thickness of a PCB product are stable through the resistance of the measuring points, and the resistance can be obviously increased when the thickness of copper or the width of line is thin, so that the effect of measuring the thickness of copper or line gaps is achieved. However, in the actual production process of the PCB, foreign matters or tiny copper wires, which are commonly called as tiny short, may form short circuits after long-term use. Particularly, automobile series products are used for a long time in different environments, short circuit is formed slightly, and abnormity occurs.
However, the conventional PCB test cannot accurately test the micro-short defect in the PCB.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: how to test for micro-short defects in a PCB board.
In order to solve the above problem, an embodiment of the present invention provides a method for identifying a short circuit, where a PCB includes a network, the network includes a line, and the method includes:
s1, gradually increasing the voltage at the two ends of the circuit to a preset voltage value;
s2, generating a time-varying curve of the electrical signal of the line in the step S1;
s3, judging whether the electrical signal has a mutation point along the time variation curve;
and S4, if the electric signal change curve has a catastrophe point, judging that the line has a micro-short.
In step S1, the voltage is gradually and uniformly increased.
The further technical scheme is that the step S2 includes:
s21, recording the electric signal of the line every preset time during the step S1;
and S22, fitting the electric signal recorded in the step S21 to generate a time-varying curve of the electric signal.
The further technical scheme is that the step S3 includes:
s31, judging whether the time-varying curve of the electric signal has a sudden change moment, wherein the change amount of the electric signal at the sudden change moment exceeds a preset change amount threshold;
and S32, if the time-varying curve of the electric signal has the mutation moment, judging whether the time-varying curve of the electric signal has the mutation point.
The further technical scheme is that the electric signal is a voltage signal or a current signal.
The further technical scheme is that the preset voltage value is 200-300V.
The further technical scheme is that the preset time is 10-15 us.
In a second aspect, a micro short identification device includes means for the method of the first aspect.
In a third aspect, a computer device comprises a memory having a computer program stored thereon and a processor implementing the method according to the first aspect when the processor executes the computer program.
In a third aspect, a computer-readable storage medium stores a computer program which, when executed by a processor, may implement the method according to the first aspect.
Compared with the prior art, the embodiment of the invention can achieve the following technical effects:
a method of micro-short recognition, comprising: s1, gradually increasing the voltage at the two ends of the line to a preset voltage value; s2, generating a time-varying curve of the electrical signal of the line in the step S1; s3, judging whether the electrical signal has a mutation point along the time variation curve; and S4, if the electric signal change curve has a catastrophe point, judging that the circuit has a short circuit, and thus, quickly and accurately identifying whether the circuit has the short circuit or not.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced 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 flow chart of a method for recognizing a micro short message according to an embodiment of the present invention;
FIG. 2 is a graph of the variation of the detection voltage with time according to the embodiment of the present invention;
FIG. 3 is a block diagram of a micro short message identification according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention 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.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Referring to fig. 1, an embodiment of the present invention provides a method for identifying a micro-short, which is used to detect whether a micro-short exists in a PCB. The PCB board includes a network including wires. In particular, the PCB may include a plurality of nets, which may include a plurality of wires. The method includes the following steps S1-S4.
And S1, gradually increasing the voltage of the two ends of the line to a preset voltage value.
In this embodiment, the trace refers to each trace of the PCB, i.e. steps S1-S4 are performed for each trace of the PCB to determine whether there is a short trace.
By connecting a voltage probe to contacts at both ends of the line and gradually boosting to a preset voltage value. Specifically, the voltage can be controlled to rise uniformly to avoid the influence of voltage jump on the test result.
And S2, generating a time-varying curve of the electric signal of the line in the step S1.
In a specific implementation, data of the electrical signal of the line during step S1 is recorded, and a time-varying curve of the electrical signal is generated.
For example, in an embodiment, step S2 specifically includes: S21-S22.
S21, during the step S1, the electrical signal of the line is recorded every preset time.
In a specific implementation, the preset time is 10-15us, for example, in this embodiment, the preset time is 13 us.
Further, the electrical signal may be a voltage signal or a current signal, for example, in the embodiment, the electrical signal is a voltage signal
And S22, fitting the electric signal recorded in the step S21 to generate a time-varying curve of the electric signal.
In specific implementation, the collected data points are firstly drawn in a preset coordinate system, and the time-varying curve of the electric signal can be obtained only by connecting the data points through a smooth curve.
And S3, judging whether the time-varying curve of the electric signal has a mutation point.
In a specific implementation, the mutation point is a point at which the value of the curve of the electrical signal changing with time fluctuates instantaneously.
Specifically, in one embodiment, the above step S3 includes the following steps S31-S32.
And S31, judging whether the time-varying curve of the electric signal has a sudden change moment, wherein the sudden change moment is that the change of the electric signal exceeds a preset change threshold value.
In specific implementation, at the time of sudden change, the variation of the electrical signal exceeds a preset variation threshold, which is expressed as instantaneous sudden change of the curve, and a breakpoint occurs.
In this embodiment, the electrical signal is a voltage signal, and the variation threshold is set to 30V. That is, if the voltage value at a certain point of the time-varying curve of the electric signal instantaneously changes by more than 30V, it is determined that the time corresponding to the point change is the abrupt change time.
And S32, if the time-varying curve of the electric signal has the mutation moment, judging whether the time-varying curve of the electric signal has the mutation point.
In specific implementation, if the time-varying curve of the electric signal has the mutation moment, whether the time-varying curve of the electric signal has the mutation point is judged. The point corresponding to the mutation time is the mutation point.
And S4, if the electric signal change curve has a catastrophe point, judging that the line has a micro-short.
In specific implementation, if the electric signal change curve has a mutation point, the circuit is judged to have a micro-short.
The principle of the invention is as follows: after the application of high voltage, the original foreign matter or fine copper wire may be changed or blown to generate sparks, and at this time, the current/voltage may fluctuate suddenly.
Specifically, when small foreign matters or copper wires exist between the lines (i.e., are slightly short), the small foreign matters or copper wires will decompose a part of the current (e.g., 10pA) according to U ═ IR while a constant current is continuously input, and in the case that the voltage is continuously increased, the actual foreign matters or copper residues will decompose a part of the voltage, resulting in a chance of a short drop in the actual voltage.
Referring to fig. 2, in one embodiment, when the detected voltage changes with time to time t, the voltage drops by Δ V, and if Δ V is greater than 30V, it is determined that a small short exists.
The embodiment of the invention provides a PCB defect detection method, which at least comprises a conduction test, a short circuit test, a leakage test, a four-wire test and the micro-short identification method provided by the embodiment.
Conduction testing: and detecting whether each section of the line of the same network is conducted.
Short circuit test: it is detected whether a short-circuit connection exists between lines of different networks.
And (3) electric leakage test: it is detected whether there is a bad connection between the wires of different networks, e.g. impurities, ionic contamination, electro-migration, etc.
Four-wire test: the actual resistance of the same network is detected, and tiny quality abnormalities such as hole breakage, small holes, thin lines and the like are detected through comparison with a set upper limit.
Referring to fig. 3, the present invention also provides a micro-short recognition device 20 corresponding to the above micro-short recognition method. The short recognition device 20 is applied to a test apparatus, and the short recognition device 20 includes:
a boosting unit 21 for performing S1 to gradually boost the voltage across the lines to a preset voltage value;
a generating unit 22 for executing S2 to generate a time-varying curve of the electrical signal of the line during step S1;
a determining unit 23, configured to execute S3 to determine whether a discontinuity exists in the time-varying curve of the electrical signal;
and the determination unit 24 is configured to execute S4, and if there is a discontinuity in the electrical signal variation curve, determine that the line has a short circuit.
In one embodiment, in step S1, the voltage is gradually and uniformly increased.
In one embodiment, step S2 includes:
s21, recording the electric signal of the line every preset time during the step S1;
and S22, fitting the electric signal recorded in the step S21 to generate a time-varying curve of the electric signal.
In one embodiment, step S3 includes:
s31, judging whether the time-varying curve of the electric signal has a sudden change moment, wherein the change amount of the electric signal at the sudden change moment exceeds a preset change amount threshold;
and S32, if the time-varying curve of the electric signal has the mutation moment, judging whether the time-varying curve of the electric signal has the mutation point.
In one embodiment, the electrical signal is a voltage signal or a current signal.
In one embodiment, the predetermined voltage is 200V-300V.
In one embodiment, the predetermined time is 10-15 us.
It should be noted that, as can be clearly understood by those skilled in the art, the detailed implementation process of the above-mentioned micro short recognition device 20 and each unit may refer to the corresponding description in the foregoing method embodiment, and for convenience and brevity of description, no further description is provided herein.
As shown in fig. 4, the embodiment of the present application provides a computer device, which includes a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, the memory 113 complete mutual communication through the communication bus 114,
a memory 113 for storing a computer program;
in one embodiment of the present application, the processor 111, when executing the program stored in the memory 113, implements the steps of any of the method embodiments described above.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program may be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program. Which when executed by a processor performs the steps of any of the method embodiments described above.
The storage medium is an entity and non-transitory storage medium, and may be various entity storage media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk. The computer readable storage medium may be non-volatile or volatile.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partly contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to the above-described embodiments, it will be understood that the invention is not limited thereto but may be embodied with various modifications and changes.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for identifying a micro-short, wherein a PCB board comprises a network, the network comprises a line, and the method comprises the following steps:
s1, gradually increasing the voltage at the two ends of the line to a preset voltage value;
s2, generating a time-varying curve of the electrical signal of the line in the step S1;
s3, judging whether the electrical signal has a mutation point along the time variation curve;
and S4, if the electric signal change curve has a catastrophe point, judging that the line has a micro-short.
2. The method of claim 1, wherein the voltage is gradually and uniformly increased in step S1.
3. The method for recognizing micro-short according to claim 1, wherein step S2 includes:
s21, recording the electric signal of the line at intervals of a preset time during the step S1;
and S22, fitting the electric signal recorded in the step S21 to generate a time-varying curve of the electric signal.
4. The method for recognizing micro-short according to claim 3, wherein the step S3 includes:
s31, judging whether the time-varying curve of the electric signal has a sudden change moment, wherein the sudden change moment is that the variation of the electric signal exceeds a preset variation threshold;
and S32, if the time-varying curve of the electric signal has the mutation moment, judging whether the time-varying curve of the electric signal has the mutation point.
5. The method of claim 3, wherein the electrical signal is a voltage signal or a current signal.
6. The method for recognizing minute shorts according to claim 1, wherein the preset voltage value is 200V-300V.
7. The method of claim 3, wherein the predetermined time is 10-15 us.
8. A micro-short identification device, characterized in that it comprises means for performing the method according to any one of claims 1-7.
9. A computer arrangement, characterized in that the computer arrangement comprises a memory having stored thereon a computer program and a processor implementing the method according to any of claims 1-7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210761106.8A CN115047318A (en) | 2022-06-29 | 2022-06-29 | Method and device for identifying micro-short, computer equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210761106.8A CN115047318A (en) | 2022-06-29 | 2022-06-29 | Method and device for identifying micro-short, computer equipment and storage medium |
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| Publication Number | Publication Date |
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| CN115047318A true CN115047318A (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210761106.8A Pending CN115047318A (en) | 2022-06-29 | 2022-06-29 | Method and device for identifying micro-short, computer equipment and storage medium |
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| CN (1) | CN115047318A (en) |
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- 2022-06-29 CN CN202210761106.8A patent/CN115047318A/en active Pending
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