CN115047318A - Method and device for identifying micro-short, computer equipment and storage medium - Google Patents

Abstract

The embodiment of the present invention discloses a micro-short identification method, device, computer equipment and storage medium. The PCB board includes a network, and the network includes a line. Gradually increase to a preset voltage value; S2, in the process of generating step S1, the electrical signal of the line changes with time curve; S3, judge whether there is a sudden change point in the electrical signal with time change curve; S4, if the electrical signal If there is a sudden change in the signal change curve, it is determined that the line is slightly short, so that whether there is a slight short in the line can be quickly and accurately identified.

Description

Micro-short identification method, device, computer equipment and storage medium

technical field

The present invention relates to the technical field of PCB testing, and in particular, to a micro-short identification method, device, computer equipment and storage medium.

Background technique

At this stage, the network test used for the PCB board is commonly known as the second-line test, which can only measure the traditional O/S (Open-ShortTest, IC open and short test). For the four-wire test of the PCB board, through the resistance value of the measuring point, it can be measured that when the copper thickness of the PCB product is stable and the board thickness is stable, the four-wire measured resistance value of each network is relatively stable, and when the copper thickness or line width is thin, the resistance value of each network is relatively stable. In this case, the resistance value will increase significantly, so as to achieve the function of measuring copper thin or circuit gap. However, in the actual PCB production process, there will also be foreign objects or tiny copper wires, commonly known as micro-short, which will form a short circuit after a long period of use. Especially the automobile series products, after being used for a long time in different environments, the short circuit will form a short circuit, resulting in abnormal occurrence.

However, existing PCB tests cannot accurately detect micro-short defects in PCB boards.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is: how to test the micro-short defects in the PCB board.

In order to solve the above problem, an embodiment of the present invention proposes a micro-short identification method. The PCB board includes a network, and the network includes a circuit. The micro-short identification method includes:

S1, gradually increase the voltage at both ends of the line to a preset voltage value;

S2, in the process of generating step S1, the electrical signal of the line changes with time curve;

S3, judging whether the change curve of the electrical signal with time has a sudden change point;

S4, if there is a sudden change in the electric signal change curve, it is determined that the line is slightly short.

A further technical solution thereof is that, in step S1, the voltage is gradually and uniformly increased.

Its further technical scheme is, step S2 comprises:

S21, in the process of step S1, record the electrical signal of the line every preset time;

S22, according to the electrical signal recorded in step S21, a curve of the electrical signal changing with time is generated by fitting.

Its further technical scheme is, step S3 comprises:

S31, judging whether there is a sudden change in the time curve of the electrical signal, wherein, at the sudden change, the change of the electrical signal exceeds a preset change threshold;

S32, if there is a sudden change in the time curve of the electrical signal, determine whether there is a sudden change in the time curve of the electrical signal.

A further technical solution thereof is that the electrical signal is a voltage signal or a current signal.

A further technical solution thereof is that the preset voltage value is 200V-300V.

A further technical solution thereof is that the preset time is 10-15us.

In a second aspect, a micro-short identification device includes a unit for the method of the first aspect.

In a third aspect, a computer device includes a memory and a processor, the memory stores a computer program, and the processor implements 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 that, when executed by a processor, can implement the method of the first aspect.

Compared with the prior art, the technical effects that the embodiments of the present invention can achieve include:

A micro-short identification method, comprising: S1, gradually increasing the voltage at both ends of a line to a preset voltage value; S2, generating a curve of the electrical signal of the line over time during step S1; S3, judging the Whether there is a sudden change in the electric signal change curve with time; S4, if there is a sudden change in the electrical signal change curve, it is determined that the line is slightly short, so that whether there is a slight short in the line can be quickly and accurately identified.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention, which are of great significance to the art For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic flowchart of a micro-short identification method proposed in an embodiment of the present invention;

FIG. 2 is a graph of the variation of detection voltage with time proposed by an embodiment of the present invention;

3 is a structural block diagram of a micro-short identification proposed in 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 ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It is to be understood that, when used in this specification and the appended claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of a number of other features, integers, steps, operations, elements, components, and/or sets thereof.

It is also to be understood that the terminology used in this specification of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise.

It should further be understood that, as used in this specification and the appended claims, the term "and/or" refers to and including 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 contextually interpreted as "when" or "once" or "in response to determining" or "in response to detecting" . Similarly, the phrases "if it is determined" or "if the [described condition or event] is detected" may be interpreted, depending on the context, to mean "once it is determined" or "in response to the determination" or "once the [described condition or event] is detected. ]" or "in response to detection of the [described condition or event]".

Referring to FIG. 1 , an embodiment of the present invention proposes a method for identifying micro-shorts, which is used to detect whether micro-shorts exist in a PCB board. The PCB board includes a network that includes wiring. Specifically, the PCB may include multiple nets, and the nets may include multiple lines. The method includes the following steps S1-S4.

S1, gradually increase the voltage at both ends of the line to a preset voltage value.

In the specific implementation, the line refers to each line of the PCB board, that is, steps S1-S4 are respectively performed for each line of the PCB board to determine whether there is a slight short.

By connecting a voltage probe to the contacts on both ends of the line and gradually boosting the voltage to a preset voltage value. Specifically, the voltage can be controlled to increase uniformly to avoid sudden changes in voltage from affecting the test results.

S2, in the process of generating step S1, the electrical signal of the line changes with time curve.

In a specific implementation, the data of the electrical signal of the line in the process of step S1 is recorded, and a curve of the electrical signal changing with time is generated.

For example, in an embodiment, step S2 specifically includes: S21-S22.

S21, in the process of step S1, the electrical signal of the line is recorded every preset time interval.

In a specific implementation, the preset time is 10-15us, for example, in this embodiment, the preset time is 13us.

Further, the electrical signal may be a voltage signal or a current signal, for example, in this embodiment, the electrical signal is a voltage signal

S22, according to the electrical signal recorded in step S21, a curve of the electrical signal changing with time is generated by fitting.

In a specific implementation, the collected data points are first drawn in a preset coordinate system, and the curve of the electrical signal over time can be obtained only by connecting the data points through a smooth curve.

S3, judging whether there is a sudden change point in the curve of the electrical signal changing with time.

In a specific implementation, the mutation point refers to the point where the value of the electrical signal changes instantaneously with time.

Specifically, in an embodiment, the above step S3 includes the following steps S31-S32.

S31. Determine whether there is a sudden change in the time-dependent curve of the electrical signal, wherein, at the sudden change, the change of the electrical signal exceeds a preset change threshold.

In a specific implementation, at the moment of sudden change, the change amount of the electrical signal exceeds the preset change amount threshold, which is manifested as an instantaneous sudden change of the curve and a breakpoint occurs.

In this embodiment, the electrical signal is a voltage signal, and the threshold value of the change amount is set to 30V. That is, if the voltage value at a certain point of the electric signal changing curve with time instantaneously changes by more than 30V, it is determined that the time corresponding to the change point is a sudden change time.

S32, if there is a sudden change in the time curve of the electrical signal, determine whether there is a sudden change in the time curve of the electrical signal.

In a specific implementation, if there is a sudden change in the time curve of the electrical signal, it is determined whether there is a sudden change in the time curve of the electrical signal. The point corresponding to the mutation moment is the mutation point.

S4, if there is a sudden change in the electric signal change curve, it is determined that the line is slightly short.

In a specific implementation, if there is a sudden change in the change curve of the electrical signal, it is determined that the line is slightly short.

The principle of the present invention is: after high voltage is applied, the original foreign matter or tiny copper wire may change or burn, and sparks are generated. At this time, the current/voltage will fluctuate suddenly.

Specifically, when there are small foreign objects or copper wires between the lines (that is, slightly short), these small foreign objects or copper wires will decompose a part of the current (for example, 10pA) when a constant current is continuously input according to U= IR, when the voltage continues to increase, the actual foreign matter or copper slag will decompose a part of the voltage, resulting in a short-term drop in the actual voltage.

Referring to FIG. 2 , in an embodiment, when the time-dependent change of the detected voltage reaches time t, the voltage drops by ΔV, and if ΔV is greater than 30V, it is determined that there is a slight short.

An embodiment of the present invention provides a method for detecting PCB board defects, which at least includes a continuity test, a short circuit test, a leakage test, a four-wire test, and the micro-short identification method proposed in the above embodiments.

Continuity test: Check whether each segment of the same network is connected.

Short-circuit test: Detects whether there is a short-circuit connection between lines of different networks.

Leakage test: Detect whether there are bad connections between the lines of different networks, such as sundries, ion pollution, electron migration, etc.

Four-wire test: Detect the actual resistance value of the same network, and detect minor quality anomalies such as broken holes, small holes, and thin wires by comparing with the set upper limit.

Referring to FIG. 3 , corresponding to the above micro-short identification method, the present invention further provides a micro-short identification device 20 . The micro-short identification device 20 is applied in the test equipment, and the micro-short identification device 20 includes:

The raising unit 21 is used for performing S1 to gradually raise the voltage at both ends of the line to a preset voltage value;

The generating unit 22 is configured to execute S2, and generate a curve of the electrical signal of the line over time during the process of generating step S1;

Judging unit 23, configured to execute S3, to judge whether there is a sudden change in the curve of the electrical signal with time;

The determining unit 24 is configured to execute S4, and if there is a sudden change point in the electrical signal change curve, determine that the line is slightly short.

In one embodiment, in step S1, the voltage is gradually and uniformly increased.

In one embodiment, step S2 includes:

S21, in the process of step S1, record the electrical signal of the line every preset time;

S22, according to the electrical signal recorded in step S21, a curve of the electrical signal changing with time is generated by fitting.

In one embodiment, step S3 includes:

S31, judging whether there is a sudden change in the time curve of the electrical signal, wherein, at the sudden change, the change of the electrical signal exceeds a preset change threshold;

S32, if there is a sudden change in the time curve of the electrical signal, determine whether there is a sudden change in the time curve of the electrical signal.

In one embodiment, the electrical signal is a voltage signal or a current signal.

In one embodiment, the preset voltage value is 200V-300V.

In one embodiment, the preset time is 10-15us.

It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above-mentioned micro-short identification device 20 and each unit may refer to the corresponding descriptions in the foregoing method embodiments. For the convenience and brevity of description, here No longer.

As shown in FIG. 4 , an embodiment of the present application provides a computer device including a processor 111 , a communication interface 112 , a memory 113 and a communication bus 114 , wherein the processor 111 , the communication interface 112 , and the memory 113 pass through the communication bus 114 complete communication with each other,

a memory 113 for storing computer programs;

In an embodiment of the present application, the processor 111 is configured to implement the steps in any one of the foregoing method embodiments when executing the program stored in the memory 113 .

It can be understood by those skilled in the art that all or part of the processes in the methods for implementing the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can 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 above-described method embodiments.

Therefore, 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. When the computer program is executed by the processor, the steps in any one of the foregoing method embodiments are implemented.

The storage medium is a physical, non-transitory storage medium, such as a U disk, a removable hard disk, a read-only memory (Read-Only Memory, ROM), a magnetic disk or an optical disk and other physical storage that can store program codes. medium. The computer-readable storage medium may be non-volatile or volatile.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is only a logical function division, and other division methods may be used in actual implementation. For example, multiple units 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 present invention may be adjusted, combined and deleted in sequence according to actual needs. Units in the apparatus of the embodiment of the present invention may be combined, divided, and deleted according to actual needs. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention is essentially or a part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, even if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed by the present invention. Modifications or substitutions should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. a micro-short identification method, is characterized in that, PCB board comprises network, and described network comprises line, and described micro-short identification method comprises: S1, gradually increase the voltage at both ends of the line to a preset voltage value; S2, in the process of generating step S1, the electrical signal of the line changes with time curve; S3, judging whether the change curve of the electrical signal with time has a sudden change point; S4, if there is a sudden change in the electric signal change curve, it is determined that the line is slightly short. 2 . The micro-short identification method according to claim 1 , wherein, in step S1 , the voltage gradually and uniformly increases. 3 . 3. micro-short identification method according to claim 1, is characterized in that, step S2 comprises: S21, in the process of step S1, record the electrical signal of the line every preset time; S22, according to the electrical signal recorded in step S21, a curve of the electrical signal changing with time is generated by fitting. 4. micro-short identification method according to claim 3, is characterized in that, step S3 comprises: S31, judging whether there is a sudden change in the time curve of the electrical signal, wherein, at the sudden change, the change of the electrical signal exceeds a preset change threshold; S32, if there is a sudden change in the time curve of the electrical signal, determine whether there is a sudden change in the time curve of the electrical signal. 5 . The micro-short identification method according to claim 3 , wherein the electrical signal is a voltage signal or a current signal. 6 . 6 . The micro-short identification method according to claim 1 , wherein the preset voltage value is 200V-300V. 7 . 7 . The micro-short identification method according to claim 3 , wherein the preset time is 10-15us. 8 . 8. A micro-short identification device, characterized in that it comprises a unit for executing the method according to any one of claims 1-7. 9. A computer device, characterized in that the computer device comprises a memory and a processor, a computer program is stored on the memory, and the processor implements any one of claims 1-7 when executing the computer program method described in item. 10. A computer-readable storage medium, characterized in that, the storage medium stores a computer program, and the computer program can implement the method according to any one of claims 1-7 when executed by a processor.

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