CN115524635A

CN115524635A - Inductance coil short circuit detection system, method and storage medium

Info

Publication number: CN115524635A
Application number: CN202211079364.4A
Authority: CN
Inventors: 邝植勤; 谢新; 刘艳
Original assignee: Heshan Shian Electronic Technology Co ltd
Current assignee: Heshan Shian Electronic Technology Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2022-12-27

Abstract

The invention discloses an inductance coil short circuit detection system, a method and a storage medium, wherein a local controller can operate a test device to open or close under the control of a main control device so as to adjust, fix and place a PCB to be tested, then an LCR tester is operated to measure a built-in inductance coil in the PCB to be tested so as to obtain the inductance value, the quality factor and the impedance value of the built-in inductance coil, and the actually measured comprehensive factor is defined and calculated according to the relationship between the three parameters and the coil short circuit. When the actually measured comprehensive factor does not belong to the comprehensive factor judgment interval, the fact that the inductance value, the quality factor and the impedance value of the built-in inductance coil are greatly different from the qualified inductance value, quality factor and impedance value is indicated, so that the built-in inductance coil of the PCB to be tested is determined to have a short circuit, and otherwise, the fact that the PCB to be tested is qualified is indicated.

Description

Inductance coil short circuit detection system, method and storage medium

Technical Field

The invention relates to the technical field of PCB detection, in particular to a system and a method for detecting short circuit of an inductance coil and a storage medium.

Background

With the rapid development of the internet of things, electronic products tend to be miniaturized, multifunctional and interconnected increasingly, and the application number of the electronic products is also increased exponentially. In the past, many functional elements in electronic devices were manufactured separately and only at the assembly stage were mounted on the PCB by means of patches, inserts, etc. In order to deal with the increasingly dense circuit design of electronic equipment, the industry develops an advanced packaging technology with an inductor, a capacitor and a resistor built in during the manufacturing of the PCB. The typical application facing consumer electronics is a wireless charging function of a mobile phone, and the basic principle is that a circuit formed by etching is adopted on a PCB to replace a discrete inductance coil element, so that the size of an inductor can be reduced, and wiring of other functions can be realized in an inductance area on the PCB.

The PCB product with micro short circuit between inductance lines is applied to a terminal product to generate potential fault risk, the problems of low efficiency, serious heating, power consumption increase and the like of the product during working can be caused, and therefore the PCB with the built-in inductance coil has the problem of short circuit detection which always troubles the PCB industry. The resistance variation caused by micro short circuit generated by fine etching residual copper between lines is in milliohm magnitude, the whole resistance of the inductance coil is in ohm magnitude, and the resistance difference caused by micro short circuit is very small. The common electric measuring machine and even the four-wire electric measuring machine only measure the resistance value to judge the open and short circuit of the circuit, so the qualification condition of the product is difficult to accurately judge due to the limitation of the precision of the resistance value.

In recent years, the detection method for the induction coil PCB product mainly adopts an Optical detection method, including using Automatic Optical Inspection (AOI) for detection, but the method is limited by the limitation of AOI Optical depth of field, frequent missed detection is caused, and the missed detection phenomenon is more serious especially for thick copper coils; and an appearance Inspection machine (AVI) is used for detection in the Final Quality Control (FQC) process, but the method is easily affected by the color and thickness of the solder resist layer, and detection omission often occurs.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an inductance coil short circuit detection system, which solves the problem that short circuit detection of a PCB with a built-in inductance coil is difficult to realize.

The invention also provides a method for detecting the short circuit of the inductance coil and a computer readable storage medium.

According to the embodiment of the first aspect of the invention, the inductance coil short-circuit detection system comprises:

the testing device is provided with a testing end and a placing platform, the placing platform is used for placing the PCB to be tested, and the testing end is at least used for obtaining the resonant frequency of an inductance coil built in the PCB to be tested;

the local controller is electrically connected with the testing equipment and used for adjusting the distance between the testing end and the PCB to be tested;

the LCR tester is electrically connected with the testing equipment and is used for measuring the inductance value, the quality factor and the impedance value of the built-in inductance coil in the PCB to be tested;

the main control equipment is electrically connected with the local controller and the LCR tester respectively, and is used for judging a result according to the inductance value, the quality factor and the impedance value of the built-in inductance coil, and the short-circuit judgment result represents the short-circuit state of the built-in inductance coil in the PCB to be tested.

The inductance coil short circuit detection system provided by the embodiment of the invention at least has the following beneficial effects:

under the control of the main control device, the local controller can operate the test device to open or close so as to adjust, fix and place the PCB to be tested, then operate the LCR tester to measure the built-in inductance coil in the PCB to be tested so as to obtain the inductance value, the quality factor and the impedance value of the PCB to be tested, and define and calculate the actually measured comprehensive factor according to the relationship between the three parameters and the short circuit of the coil. When the actually measured comprehensive factor does not belong to the comprehensive factor judgment interval, the fact that the inductance value, the quality factor and the impedance value of the built-in inductance coil are greatly different from the qualified inductance value, quality factor and impedance value is indicated, so that the built-in inductance coil of the PCB to be tested is determined to be short-circuited, and otherwise, the fact that the PCB to be tested is qualified is indicated. Therefore, the inductance coil short-circuit detection system can accurately detect the PCB with the built-in inductance coil having the short-circuit defect, thereby preventing potential fault risks caused by application of the PCB product to a terminal product, and solving the problems of low efficiency, serious heating, increased power consumption and the like of the product during working.

According to some embodiments of the invention, the test apparatus comprises:

the needle bed jig is used for placing the PCB to be tested;

and the PCB electric measuring machine is at least used for acquiring the resonant frequency of the built-in inductance coil in the PCB to be tested.

According to some embodiments of the invention, the material of the needle bed jig is made of an anti-interference shielding material.

According to some embodiments of the present invention, the mobile terminal further comprises a printing device, wherein the printing device is electrically connected to the main control device, and the printing device is configured to print out a short-circuit determination result.

The method for detecting the short circuit of the inductance coil according to the embodiment of the second aspect of the invention is applied to the system for detecting the short circuit of the inductance coil according to any one of the embodiments of the first aspect of the invention, and comprises the following steps:

obtaining an inductance value, a quality factor and an impedance value of a built-in inductance coil in the PCB to be tested, wherein the inductance value, the quality factor and the impedance value are measured by the LCR tester;

determining an actually measured comprehensive factor corresponding to a built-in inductance coil in the PCB to be tested according to the inductance value, the quality factor and the impedance value;

and obtaining a short circuit judgment result according to a pre-obtained comprehensive factor judgment interval and the actually measured comprehensive factor, wherein the short circuit judgment result represents the short circuit state of the built-in inductance coil in the PCB to be tested.

The inductance coil short circuit detection method provided by the embodiment of the invention at least has the following beneficial effects:

the inductance coil short-circuit detection method is applied to the inductance coil short-circuit detection system of the embodiment of the invention, so that the local controller can operate the test equipment to open or close under the control of the main control equipment to adjust, fix and place the PCB to be tested, then operate the LCR tester to measure the built-in inductance coil in the PCB to be tested to obtain the inductance value, the quality factor and the impedance value of the built-in inductance coil, and define and calculate the measured comprehensive factor according to the relationship between the three parameters and the coil short-circuit. When the actually measured comprehensive factor does not belong to the comprehensive factor judgment interval, the fact that the inductance value, the quality factor and the impedance value of the built-in inductance coil are greatly different from the qualified inductance value, quality factor and impedance value is indicated, so that the built-in inductance coil of the PCB to be tested is determined to have a short circuit, and otherwise, the fact that the PCB to be tested is qualified is indicated. Therefore, the inductance coil short-circuit detection system can accurately detect the PCB with the built-in inductance coil having the short-circuit defect, thereby preventing potential fault risks caused by application of the PCB product to a terminal product, and solving the problems of low efficiency, serious heating, increased power consumption and the like of the product during working.

According to some embodiments of the invention, obtaining the integrated factor determination interval comprises:

respectively obtaining resonance frequencies of built-in inductance coils in a plurality of qualified PCBs, and determining a test frequency according to the resonance frequencies, wherein each resonance frequency is obtained by measuring at a test end;

obtaining an inductance value, a quality factor and an impedance value of a built-in inductance coil in each qualified PCB, wherein each inductance value, quality factor and impedance value are measured by the LCR tester at the test frequency;

determining each qualified comprehensive factor corresponding to the built-in inductance coil in the qualified PCB according to each inductance value, the quality factor and the impedance value;

and determining a comprehensive factor judgment interval according to the qualified comprehensive factors.

According to some embodiments of the present invention, the determining a measured comprehensive factor corresponding to a built-in inductor coil in the PCB to be tested according to the inductance value, the quality factor and the impedance value comprises:

and obtaining the product of the inductance value, the quality factor and the impedance value to obtain the measured comprehensive factor.

According to some embodiments of the invention, said determining a test frequency from a plurality of said resonant frequencies comprises the steps of:

calculating an average of a plurality of the resonant frequencies to obtain the test frequency.

According to some embodiments of the invention, said determining a synthesis factor decision interval from a plurality of said qualified synthesis factors comprises the steps of:

determining a minimum value and a maximum value of a plurality of qualified synthesis factors;

and respectively taking the minimum value and the maximum value in the qualified comprehensive factors as the minimum value and the maximum value of the interval to determine a continuous real number interval, thereby obtaining the judgment interval of the comprehensive factors.

A computer-readable storage medium according to an embodiment of the third aspect of the present invention stores computer-executable instructions for causing a computer to execute the inductance coil short-circuit detection method as described above.

It is to be understood that the advantageous effects of the third aspect compared with the related art are the same as the advantageous effects of the second aspect compared with the related art, and reference may be made to the related description in the second aspect, which is not repeated herein.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is an equivalent circuit diagram of a built-in inductor PCB according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a PCB short circuit detection system with an inductor coil built in according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method for detecting a short circuit of a PCB with an internal inductor according to an embodiment of the present invention;

fig. 4 is a flowchart of a method for obtaining an integrated factor determination interval according to an embodiment of the present invention.

Reference numerals:

a test apparatus 100; a local controller 200; an LCR tester 300; a master device 400; the printing apparatus 500.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly defined, terms such as setup, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the detailed contents of the technical solutions.

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the embodiments described below are some, but not all embodiments of the present invention.

It should be noted that, according to theoretical analysis of physical devices and circuits for testing the PCB built-in inductor, an equivalent circuit diagram can be obtained, specifically referring to fig. 1. Through the analysis of the equivalent circuit diagram, the testing system is essentially an LC parallel oscillating circuit, so that the factor for judging the short circuit of the inductance coil can be found out only by measuring, calculating and analyzing the physical quantity on the LC parallel oscillating circuit, and the following mathematical model is established according to the theoretical formula of the physics dynamic circuit:

L＝Ut/I′(t)＝NΦ′(t)/i′(t)，

wherein, L is inductance value, N is coil turn number, phi '(t) is magnetic flux derivative, i' (t) is current derivative;

Q＝WL/R＝1/WRC＝WRC＝[(2πf)*(NΦ′(t)/i′(t))]/R，

wherein Q is an inductance quality factor, W is a resonance angular frequency, f is a resonance period frequency, N is the number of turns of the coil, and R is an effective resistance of the coil;

wherein, f ₀ Is the resonant frequency, L is the inductance value, C is the capacitance value;

Z＝(R+jwL)/[1+jwc(R+jwL)]，

Z ₀ ＝L/RC，

wherein Z represents the impedance function of the LC parallel circuit, Z ₀ The maximum impedance at the resonant frequency, R is the resistance, C is the capacitance, and L is the inductance.

Measuring inductance value L, quality factor Q and impedance value Z according to a large number of short circuit defect products and qualified products ₀ The data analysis of (2) shows that for the product with the short circuit defect of the built-in coil, the three physical quantities are all smaller than the numerical value of the qualified product without the short circuit, and the difference is the largest compared with the qualified product when the resonant frequency is lower. Therefore, in order to accurately judge whether the PCB to be tested is short-circuited, the resonant frequency f of the inductance coil built in the PCB to be tested is determined firstly ₀ And using a resonant frequency of f ₀ Measuring and obtaining inductance L, quality factor Q and impedance value Z of built-in inductance coil as test signal ₀ And analyzing and judging the three physical quantities, so as to obtain the result of whether the PCB to be tested is short-circuited.

Referring to fig. 2, a schematic structural diagram of an inductance coil short-circuit detection system according to an embodiment of the present invention is shown, where the inductance coil short-circuit detection system includes: test device 100, local controller 200, LCR tester 300, master control device 400. The testing device 100 is provided with a testing end and a placing platform, wherein the placing platform is used for placing a PCB to be tested, and the testing end is at least used for acquiring the resonant frequency of an inductance coil built in the PCB to be tested; the local controller 200 is electrically connected to the test equipment 100, and is configured to adjust a distance between the test end and the PCB to be tested; the LCR tester 300 is electrically connected to the test equipment 100, and is configured to measure an inductance value, a quality factor, and an impedance value of a built-in inductor in the PCB to be tested; the main control device 400 is electrically connected to the local controller 200 and the LCR tester 300, respectively, and the main control device 400 is configured to obtain a short-circuit determination result according to an inductance value, a quality factor, and an impedance value of the built-in inductor, where the short-circuit determination result represents a short-circuit state of the built-in inductor in the PCB to be tested.

As shown in fig. 2, when short-circuit detection needs to be performed on a PCB with an inductor coil built therein, the PCB to be tested is placed on the placement platform of the testing apparatus 100, the main control apparatus 400 calls the local controller 200 to adjust a distance between a testing end of the testing apparatus 100 and the PCB to be tested, so as to ensure good contact, and after the PCB to be tested is placed, the main control apparatus 400 calls the LCR tester 300 to measure and obtain an inductance value, a quality factor, and an impedance value of the inductor coil built in the PCB to be tested. The three physical quantities obtained by measurement are transmitted back to the main control device 400 for processing, and the corresponding actually measured comprehensive factors are obtained according to the set functional relationship, and the main control device 400 judges the actually measured comprehensive factors according to the comprehensive factor judgment interval so as to finally determine whether the short circuit exists in the built-in inductance coil in the PCB to be tested.

Specifically, in some embodiments, LCR tester 300 is in the form of a day IM3536 model; the main control device 400 adopts a computer PC, and some parameters such as the measured comprehensive factors obtained by processing of the computer PC can be displayed by a display thereof; the local controller 200 adopts a PLC controller, and a computer PC can write a code program by using Visual Basic language and control and operate the PLC controller through an I/O interface; the computer PC acquires the inductance value, quality factor, and impedance value measured by the LCR tester 300 through the LAN interface.

In this embodiment, under the control of the main control device 400, the local controller 200 may operate the testing device 100 to perform an opening or closing operation to adjust and fix and place the PCB to be tested, then operate the LCR tester 300 to measure the built-in inductor in the PCB to be tested to obtain an inductance value, a quality factor, and an impedance value thereof, and define and calculate an actual measurement comprehensive factor according to a relationship between the three parameters and a short circuit of the coil. When the actually measured comprehensive factor does not belong to the comprehensive factor judgment interval, the fact that the inductance value, the quality factor and the impedance value of the built-in inductance coil are greatly different from the qualified inductance value, quality factor and impedance value is indicated, so that the built-in inductance coil of the PCB to be tested is determined to have a short circuit, and otherwise, the fact that the PCB to be tested is qualified is indicated. Therefore, the inductance coil short-circuit detection system can accurately detect the PCB with the built-in inductance coil having the short-circuit defect, thereby preventing potential fault risks caused by application of the PCB product to a terminal product, and solving the problems of low efficiency, serious heating, increased power consumption and the like of the product during working.

In some embodiments, the test apparatus 100 includes: needle bed tool, PCB electricity survey machine. The needle bed jig is used for placing a PCB to be tested; the PCB electric measuring machine is at least used for obtaining the resonant frequency of the built-in inductance coil in the PCB to be tested.

Specifically, for the testing device 100 in the embodiment of the present invention, a common and common PCB electrical measuring machine is adopted, and a neilsbed fixture is provided to assist in controlling the action or position, it can be understood that the PCB electrical measuring machine itself can complete some testing tasks of related parameters of the PCB, and the resonant frequency of the inductor coil built in the PCB can be obtained by providing the PCB electrical measuring machine with related devices such as a spectrum analyzer, and the resonant frequency is used for enabling the LCR tester 300 to perform measurement at a corresponding frequency to make the reliability of the measurement data result stronger, and ensure the accuracy of the final short circuit determination result.

In some embodiments, the material of the needle bed jig adopts an anti-interference shielding material.

It can be understood that the needle bed jig is made of anti-interference shielding materials, so that the interference of high-frequency signals can be resisted, and the accuracy of acquiring the physical quantity data to be acquired can be ensured.

In some embodiments, the induction coil short-circuit detection system further includes a printing device 500, the printing device 500 is electrically connected to the main control device 400, and the printing device 500 is configured to print out the short-circuit determination result.

Specifically, referring to fig. 2, the short-circuit determination result obtained after being processed by the main control device 400 may be displayed on the display of the computer PC, on the one hand, and may be printed by the printing device 500, on the other hand.

Referring to fig. 3, a method for detecting a short circuit of an inductor according to an embodiment of the present invention is applied to a system for detecting a short circuit of an inductor according to any embodiment of the present invention, and includes the following steps:

obtaining the inductance value, the quality factor and the impedance value of an inductance coil built in a PCB to be tested, wherein the inductance value, the quality factor and the impedance value are measured by an LCR tester 300;

determining an actual measurement comprehensive factor corresponding to an inductance coil built in the PCB to be tested according to the inductance value, the quality factor and the impedance value;

and obtaining a short circuit judgment result according to the pre-obtained comprehensive factor judgment interval and the actually measured comprehensive factor, wherein the short circuit judgment result represents the short circuit state of the built-in inductance coil in the PCB to be tested.

Specifically, referring to fig. 3, a flowchart of an inductance coil short circuit detection method according to an embodiment of the present invention is shown. Referring to fig. 2, when short-circuit detection needs to be performed on a PCB with an inductor coil built therein, the PCB to be tested is placed on the placement platform of the testing device 100, the main control device 400 calls the local controller 200 to adjust a distance between a testing end of the testing device 100 and the PCB to be tested, so as to ensure good contact, and after the PCB to be tested is placed, the main control device 400 calls the LCR tester 300 to measure and obtain an inductance value, a quality factor, and an impedance value of the inductor coil built in the PCB to be tested. The three physical quantities obtained by measurement are transmitted back to the main control device 400 for processing, and corresponding actually measured comprehensive factors are obtained according to the set functional relationship, and the main control device 400 judges the actually measured comprehensive factors according to the comprehensive factor judgment interval so as to finally determine whether the built-in inductance coil in the PCB to be tested has a short circuit.

In some embodiments, the method of inductive coil short detection further comprises the steps of: the main control apparatus 400 operates the printing apparatus 500 to print out the obtained short circuit determination result.

It can be understood that, the method for detecting short circuit of an inductor according to the embodiment of the present invention is applied to the system for detecting short circuit of an inductor according to the embodiment of the present invention, so that under the control of the main control device 400, the local controller 200 can operate the testing device 100 to perform opening or closing actions to adjust, fix and place the PCB to be tested, then operate the LCR tester 300 to measure the built-in inductor in the PCB to be tested to obtain the inductance, quality factor, and impedance value thereof, and define and calculate the measured comprehensive factor according to the relationship between the three parameters and the short circuit of the inductor. When the actually measured comprehensive factor does not belong to the comprehensive factor judgment interval, the fact that the inductance value, the quality factor and the impedance value of the built-in inductance coil are greatly different from the qualified inductance value, quality factor and impedance value is indicated, so that the built-in inductance coil of the PCB to be tested is determined to be short-circuited, and otherwise, the fact that the PCB to be tested is qualified is indicated. Therefore, the inductance coil short-circuit detection system can accurately detect the PCB with the built-in inductance coil having the short-circuit defect, thereby preventing potential fault risks caused by application of the PCB product to a terminal product, and solving the problems of low efficiency, serious heating, increased power consumption and the like of the product during working.

In some embodiments, referring to fig. 4, obtaining the comprehensive factor determination interval includes the following steps:

obtaining the inductance value, the quality factor and the impedance value of the built-in inductance coil in each qualified PCB, wherein each inductance value, quality factor and impedance value are measured by the LCR tester 300 at the test frequency;

determining each qualified comprehensive factor corresponding to the built-in inductance coil in the qualified PCB according to each inductance value, quality factor and impedance value;

Referring to fig. 4, it can be understood that, for determining whether there is a short circuit condition in the built-in inductor of the PCB to be tested, the relevant parameters of the qualified PCB are used as a reference. Therefore, in some embodiments, 10 qualified PCBs with built-in inductor coils are selected and placed in the testing apparatus 100 to perform a spectrum scan to obtain the resonant frequencies of the 10 PCBs, and a testing frequency can be finally determined according to the 10 resonant frequencies. The 10 qualified PCBs are measured by the LCR tester 300 at the test frequency to obtain 10 sets of corresponding inductance, quality factors, and impedance values, and 10 qualified comprehensive factors are obtained by corresponding calculation. And finally, determining a comprehensive factor judgment interval according to the 10 qualified comprehensive factors to be used for judging the actually measured comprehensive factor obtained by measurement and calculation of the PCB to be tested.

It can be understood that the qualified comprehensive factor and the actually measured comprehensive factor are comprehensive factors under the same definition, that is, the qualified comprehensive factor represents a comprehensive factor calculated by using qualified PCB measurement, and the actually measured comprehensive factor represents a comprehensive factor calculated by measuring the PCB to be tested.

In some embodiments, determining a measured comprehensive factor corresponding to an inductance coil built in a PCB to be tested according to an inductance value, a quality factor and an impedance value includes the following steps:

and (4) obtaining the product of the inductance value, the quality factor and the impedance value to obtain the actually measured comprehensive factor.

It is understood that the measured integral factor is a function dependent variable with respect to the inductance, quality and impedance values as independent variables, and can define a mathematical expression as:

K＝F(L,Q,Z ₀ ),

wherein K is the actual measurement comprehensive factor, L is the inductance value, f is the quality factor, Z ₀ Is the impedance value.

Due to the PCB product with the short-circuit defect of the built-in inductance coil, the three physical quantities are smaller than those of a qualified PCB product without the short circuit, and the three physical quantities are at the resonant frequency f ₀ The difference between time and acceptable PCBs is greatest. Therefore, in order to accurately and more easily determine whether the built-in inductor in the PCB is short-circuited, it is first clear that the functional expression K of the actually measured integrated factor needs to be respectively connected to L, Q, Z ₀ In order to make the difference between qualified and unqualified PCBs larger in quantitative form, and therefore, the functional expression of a specific actually measured comprehensive factor can be determined as follows:

K＝L*Q*Z ₀ ，

the measured comprehensive factor is equal to the product of the inductance value, the quality factor and the impedance value, so that the difference between the measured comprehensive factors of qualified PCBs and unqualified PCBs is obvious, and whether the PCBs are short-circuited or not can be easily determined when the measured comprehensive factors are finally judged. It should be understood that, for the qualified integrated factor, the definition thereof should be the same as that of the actually measured integrated factor, that is, for the integrated factor determination interval to be obtained, the qualified integrated factor also needs to be calculated according to the same functional relation as described above.

In some embodiments, determining the test frequency from the plurality of resonant frequencies comprises:

the plurality of resonant frequencies are averaged to obtain a test frequency.

It will be appreciated that the test frequency of LCR tester 300 may be determined for a plurality of resonant frequencies measured by the spectral sweep, particularly by averaging them. In some embodiments, a maximum and a minimum may be removed for a plurality of resonant frequencies and then averaged to some extent to avoid extreme data that would cause the final determined test frequency to be too abnormal.

In some embodiments, determining the synthesis factor decision interval based on a plurality of qualified synthesis factors comprises:

determining a minimum value and a maximum value of the plurality of qualified synthesis factors;

and respectively taking the minimum value and the maximum value in the qualified comprehensive factors as the minimum value and the maximum value of the interval to determine a continuous real number interval to obtain a comprehensive factor judgment interval.

It is understood that the minimum value and the maximum value of the plurality of qualified integrated factors are taken as the minimum value and the maximum value of the interval, thereby obtaining the integrated factor determination interval. In fact, since all the PCBs are qualified PCBs, the difference between the qualified synthesis factors is not large, and the difference may only be reflected in the error existing in the measurement. Therefore, the actual range of the comprehensive factor judging interval is not too large, and for unqualified PCBs, the actually measured comprehensive factors are obviously difficult to fall into the comprehensive factor judging interval. In some embodiments, the minimum value and the maximum value in the multiple qualified comprehensive factors can be removed to eliminate abnormal data, and the judgment accuracy of the comprehensive factor judgment interval is ensured.

Furthermore, embodiments of the present invention also provide a computer-readable storage medium, which stores computer-executable instructions, which are executed by one or more control processors, and can cause the one or more control processors to execute a method for detecting short circuit of an inductance coil in the above-described method embodiments, for example, to execute the functions of the above-described method steps in fig. 3.

Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a general hardware platform. Those skilled in the art will appreciate that all or part of the processes of the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.

One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as is well known to those skilled in the art.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. An induction coil short circuit detection system, comprising:

the testing device is provided with a testing end and a placing platform, the placing platform is used for placing a PCB to be tested, and the testing end is at least used for obtaining the resonant frequency of an inductance coil built in the PCB to be tested;

2. The induction coil short detection system of claim 1, wherein the test equipment comprises:

the needle bed jig is used for placing the PCB to be tested;

3. The system for detecting the short circuit of the inductance coil according to claim 2, wherein the needle bed jig is made of an anti-interference shielding material.

4. The system for detecting the short circuit of the inductance coil according to claim 1, further comprising a printing device, wherein the printing device is electrically connected to the main control device, and the printing device is configured to print out a short circuit determination result.

5. An inductance coil short-circuit detection method applied to the inductance coil short-circuit detection system according to any one of claims 1 to 4, characterized by comprising the following steps:

6. The method for detecting the short circuit of the inductance coil according to claim 5, wherein the step of obtaining the comprehensive factor judgment interval comprises the following steps:

determining each qualified comprehensive factor corresponding to the inductance coil built in the qualified PCB according to each inductance value, the quality factor and the impedance value;

7. The method for detecting the short circuit of the inductance coil according to claim 6, wherein the step of determining a measured comprehensive factor corresponding to the built-in inductance coil in the PCB to be tested according to the inductance value, the quality factor and the impedance value comprises the following steps:

8. The method of claim 6, wherein said determining a test frequency from a plurality of said resonant frequencies comprises the steps of:

9. The method for detecting the short circuit of the inductance coil according to claim 6, wherein the step of determining the comprehensive factor judgment section according to the qualified comprehensive factors comprises the following steps:

and respectively taking the minimum value and the maximum value in the qualified comprehensive factors as the minimum value and the maximum value of the interval to determine a continuous real number interval to obtain the judgment interval of the comprehensive factors.

10. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method of any one of claims 5 to 9.