CN103698644B - Based on PCB method for detecting short circuit and the detection device of hall sensing device array - Google Patents
Based on PCB method for detecting short circuit and the detection device of hall sensing device array Download PDFInfo
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Abstract
The present invention relates to fault detection technique field, disclose the PCB method for detecting short circuit based on hall sensing device array and detection device. Its method comprises: in hall sensing device array, each sensor rotates by the cycle and collection period collection magnetic field data. Magnetic field data when magnetic field data when upper analytical engine gathers cold drawing magnetic field data, the excitation of the pcb board of normal operation respectively by the level attitude of adjustment detection platform and hall sensing device array and pcb board to be measured excitation, and carry out the synthesis process of image, obtain the Distribution of Magnetic Field matrix diagram in three kinds of situations, again Distribution of Magnetic Field matrix diagram is normalized and maps on gray-scale map, obtain position of fault magnetic field gray-scale map, finally the point on gray-scale map is made threshold difference, obtain position of fault distribution plan, with the probability judging that on pcb board, position of fault occurs. The application program can solve accurate failure judgement position time breaking down in multiple place, it is to increase the efficiency of detection, reduces costs and manufacture craft.
Description
Technical field
The present invention relates to fault detection technique field, in particular to a kind of PCB method for detecting short circuit based on hall sensing device array and detection device.
Background technology
Along with the development of large-scale integrated circuit technology, the structure of various electronics is more and more accurate complicated, and the integration degree of printed circuit board (PCB) is also more and more higher. In the process that PCB prints, the failure testing of PCB must be related to, utilize traditional mechanical probes that circuit card is carried out contact measurement, more and more it is difficult to meet actual needs, be generally difficult to rely on the sense organ of people and experience that failure factor is checked out. And the fault diagnosis technology based on Magnetic image is valued by the people gradually.
Owing to circuit card is under energising excited state, electric current on circuit and the circuit board element such as resistance, the integrated chip etc. that are magnetized all will produce electromagnetic radiation, form specific magnetic field in space. The Distribution of Magnetic Field characteristic of circuit and the current distribution characteristic of circuit, have one-to-one relationship. When circuit card components and parts or circuit break down, size and the direction of electric current must be caused to change, and the magneticstrength at any some place depends primarily on size and the distribution situation thereof of electric current in circuit card near field region, so that corresponding change also occurs in its near field magnetic field distribution simultaneously. The working order of decision circuitry plate is carried out by Distribution of Magnetic Field situation when detection circuit or system works, just can realize the Detection and diagnosis to circuit card noncontact formula, this kind is according to detection circuit near field magnetic field distribution state, thus realize the technology of the trouble diagnosis to circuit card, it is referred to as the fault diagnosis technology based on Magnetic image.
In the current fault diagnosis technology based on Magnetic image, H Field probe is adopted to coordinate the form of spectrum analyzer to realize the acquisition (adopt the cost of this kind of method higher) of Magnetic image, or the single hall sensing device that adopts having carries out the acquisition of Magnetic image, owing to hall sensing device can only measure the magneticstrength of single aspect, when detecting, testing staff needs being familiar with this detected circuit structure, detection efficiency is low, and cannot solve the problem being difficult to accurately judge position time breaking down in multiple place.
Summary of the invention
Embodiment of the present invention object is to provide the PCB method for detecting short circuit based on hall sensing device array and detection device, apply this technical scheme and can solve accurate failure judgement position time breaking down in multiple place, improve the efficiency of detection, reduce costs and manufacture craft.
First aspect, embodiments provides the PCB method for detecting short circuit based on hall sensing device array, comprising:
A, PCB working properly is fixed on detection device detection platform on, by hall sensing device array be directed at described PCB working properly, the position recording described hall sensing device array current is starting position;
B, open described hall sensing device array, in described hall sensing device array, each sensor rotates according to the default cycle and gathers magnetic field data, by adjusting described detection platform and the level attitude of described hall sensing device array, and the magnetic field data according to described collection, obtain unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew, the Distribution of Magnetic Field matrix diagram of the 3rd skew successively;
The Distribution of Magnetic Field matrix diagram of the Distribution of Magnetic Field matrix diagram of C, the superposition described unmigrated Distribution of Magnetic Field matrix diagram of synthesis, described first skew, the Distribution of Magnetic Field matrix diagram of described 2nd skew and described 3rd skew, obtains the first Distribution of Magnetic Field matrix diagram;
D, to described PCB working properly add actuation signal, repeating step B to C, obtain the 2nd Distribution of Magnetic Field matrix diagram;
E, PCB to be measured is fixed on the detection platform of detection device, and adds described actuation signal, more described hall sensing device array is returned to described starting position, repeating step B to C, obtain the 3rd Distribution of Magnetic Field matrix diagram;
F, described 2nd Distribution of Magnetic Field matrix diagram is subtracted described first Distribution of Magnetic Field matrix diagram, obtain the 4th Distribution of Magnetic Field matrix diagram, described 4th Distribution of Magnetic Field matrix diagram is normalized and maps on gray-scale map, obtain the first Distribution of Magnetic Field gray-scale map;
G, described 3rd Distribution of Magnetic Field matrix diagram is subtracted described first Distribution of Magnetic Field matrix diagram, obtain the 5th Distribution of Magnetic Field matrix diagram, described 5th Distribution of Magnetic Field matrix diagram is normalized and maps on gray-scale map, acquisition the 2nd Distribution of Magnetic Field gray-scale map;
H, the 2nd Distribution of Magnetic Field gray-scale map is subtracted the first Distribution of Magnetic Field gray scale, obtain the fault magnetic field gray-scale map of described PCB to be measured, each point on the gray-scale map of described fault magnetic field is made threshold difference, obtain position of fault distribution plan, so that testing staff is according to described position of fault distribution plan, obtain the detected result of described PCB to be measured.
Further, step B specifically comprises: B1, open described hall sensing device array, and in described hall sensing device array, each described sensor rotates according to the default cycle and collection period gathers magnetic field data, obtains described unmigrated Distribution of Magnetic Field matrix diagram;
B2, the described hall sensing device array that resets, to described starting position, by described hall sensing device array in the horizontal direction, to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described first skew;
B3, the described hall sensing device array that resets are to described starting position, and by described hall sensing device array in the horizontal direction, pan-down described unit length, gathers current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described 2nd skew;
B4, the described hall sensing device array that resets are to described starting position, by described hall sensing device array in the horizontal direction, pan-down described unit length, again to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described 3rd skew.
Further step C specifically comprises: unmigrated Distribution of Magnetic Field matrix diagram described in superposition, the Distribution of Magnetic Field matrix diagram of described first skew, the Distribution of Magnetic Field matrix diagram of described 2nd skew and the Distribution of Magnetic Field matrix diagram of the 3rd skew, when superposition, described hall sensing device array central authorities are not collected the place of data, according to the described central authorities data that around four data collection points collect, carry out the interpolation processing of arithmetical av, to the point being in position, border, according to around border three data that data collection point collects, carry out the interpolation processing of arithmetical av, thus obtain described first Distribution of Magnetic Field matrix diagram. second aspect, embodiments provides a kind of PCB short-circuit detecting device based on hall sensing device array, comprising: for the detection platform of fixing PCB, for the Huo Er array retaining plate of fixing hall sensing device array, described Huo Er array retaining plate is provided with multiple grid, each described grid intersection point all fixes the rotation wheel that is connected into a line by travelling belt, and wherein said rotation is taken turns for rotating a hall sensing device fixed thereon, for driving described travelling belt, so that driving the described stepper-motor rotating wheel and rotating, described stepper-motor is connected with described travelling belt, is fixed on described Huo Er array retaining plate, for, in default collection period, controlling described hall sensing device array and gather magnetic field data, and described magnetic field data are processed the final upper analytical engine obtaining position of fault distribution plan, for emitting radio frequency signal and import to produce magnetic field in PCB so that Hall sensor array can receive the actuation signal source generator of PCB Distribution of Magnetic Field information,
Wherein, described detection platform and described Huo Er array retaining plate are connected by fixing support, and in described upper analytical engine and described hall sensing device array, each described hall sensing device communicates to connect, and described actuation signal source generator is connected with described detection platform.
Further, described stepper-motor is four phase step motor.
Further, described PCB short-circuit detecting device, also comprise: for being directed at the position of described Huo Er array retaining plate and described detection platform and confirm the laser positioning device of described Huo Er array retaining plate position, described laser positioning device is connected with described Huo Er array retaining plate.
Further, described laser positioning device is at least 4 laser pens, and described laser positioning device is connected with described Huo Er array retaining plate, specifically comprises: each described laser pen is separately fixed at four summits of described Huo Er array retaining plate.
Further, described hall sensing device array comprises: for gathering multiple hall sensing devices of magnetic field data.
Therefore, application the present embodiment technical scheme, PCB working properly is fixed on detection platform, by the level attitude of adjustment detection platform and hall sensing device array, open the magnetic field data that hall sensing device array gathers this PCB, obtain the Distribution of Magnetic Field matrix diagram of unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew and the 3rd skew respectively. The Distribution of Magnetic Field matrix diagram obtained is carried out the image procossing of superposition synthesis by upper analytical engine, obtains the first Distribution of Magnetic Field matrix diagram. Pcb board working properly is added actuation signal, repeats aforesaid method and obtain the 2nd Distribution of Magnetic Field matrix diagram. Change the circuit card on detection platform into PCB to be measured, repeat aforesaid method and obtain the 3rd Distribution of Magnetic Field matrix diagram. After the first, second, third Distribution of Magnetic Field matrix diagram obtained is carried out image procossing by upper analytical engine, obtaining the first Distribution of Magnetic Field gray-scale map and the 2nd Distribution of Magnetic Field gray-scale map respectively, what its distribution was corresponding is the Distribution of Magnetic Field gray-scale map of PCB working properly and the Distribution of Magnetic Field gray-scale map of PCB to be measured. Upper analytical engine continues first, second Distribution of Magnetic Field gray-scale map is carried out image procossing, obtain the fault magnetic field gray-scale map of this PCB to be measured, each point on this fault magnetic field gray-scale map is made threshold difference, obtain position of fault distribution plan, testing staff can according to the numerical value on position of fault distribution plan, the position of fault probability distribution obtaining PCB to be measured directly perceived, thus obtain detected result. Visible, the circuit structure being detected need to be familiar with compared to testing staff in prior art, the situation that detection efficiency is low, adopt technical solution of the present invention, testing staff intuitively can obtain position of fault probability distribution in position of fault distribution plan, the more big fault probability of numerical value is more high, it is to increase detection efficiency, and can effectively judge position of fault when breaking down in multiple place. In addition, the technical program need not very accurately obtain the complete magnetic field situation of PCB, while carrying out the method acquisition high precision of Images uniting after utilizing grid to offset, can reduce costs and manufacture craft difficulty.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the PCB method for detecting short circuit based on hall sensing device array that Fig. 1 provides for the embodiment of the present invention 1;
The Distribution of Magnetic Field synthesis schematic diagram that Fig. 2 provides for the embodiment of the present invention 1;
Fig. 3 is the structural representation that the embodiment of the present invention 2 provides the PCB short-circuit detecting device based on hall sensing device array;
Fig. 4 is another kind of optional structural representation that the embodiment of the present invention 2 provides this detection device;
Fig. 5 is the preferred perspective view that the embodiment of the present invention 2 provides this detection device.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
See Fig. 1, present embodiments providing a kind of PCB method for detecting short circuit based on hall sensing device array, be applicable to the short trouble detection of PCB, its key step and principle of work are as follows:
Steps A: PCB working properly be fixed on the detection platform of detection device, hall sensing device array is directed at this PCB working properly, the position recording hall sensing device array current is starting position.
In the present embodiment, hall sensing device array can be, but not limited to adopt the form of grid to arrange, the size of grid can be, but not limited to adopt typical case value 3cm*3cm, and the distance of hall sensing device array and PCB can be, but not limited to adopt typical case value 5cm. Each grid intersection point all fixes the rotation wheel that is connected into a line by travelling belt, rotates and is fixed with hall sensing device on wheel. Travelling belt provides power by stepper-motor, and this stepper-motor can be, but not limited to as four phase step motor, to improve control accuracy, it is to increase moment so that it is can drive travelling belt, and during work, typical case's rotating speed is every rotation completing a week for 10 seconds.
In the present embodiment, hall sensing device array is directed at the PCB on detection platform by laser positioning device. This laser status device can for being fixed on four laser pens on hall sensing device array four summits, and it is positioned alignment by the region being made up of four laser pens. Record the current position of hall sensing device array in the registered, and to define this position be starting position.
Step B: open hall sensing device array, in hall sensing device array, each sensor rotates according to the default cycle and gathers magnetic field data, by the level attitude of adjustment detection platform and hall sensing device array, and the magnetic field data according to this collection, obtain the Distribution of Magnetic Field matrix diagram of unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew and the 3rd skew successively.
In the present embodiment, opening hall sensing device array, each sensor rotates according to the default cycle and gathers magnetic field data so that it is can send this magnetic field data to upper computer analytical engine. Via being connected to, the four phase step motor being sent to controls each hall sensing device on Hall sensor array, it is worth every rotation completing a week for 10 seconds with typical case, within every second, complete the data sampling of 10 times, and the magneticstrength maximum value collected by hall sensing device on each node of network is transferred to upper computer, thus obtaining Distribution of Magnetic Field matrix diagram, the element value in matrix diagram can just can be born. This rotation cycle and collection period can be, but not limited to as typical case's value, for example utilize the stepper-motor of more phase place, and taking 20 seconds as a measuring period, for each hall sensing device, altogether gather the data of 200 times, finally obtain ideal result.
In the present embodiment, the concrete acquisition step of each Distribution of Magnetic Field matrix diagram can be, but not limited to as: B1, opens hall sensing device array, hall sensing device array is in starting position, each sensor rotates according to the default cycle and gathers current magnetic field data, obtains unmigrated Distribution of Magnetic Field matrix diagram; B2, hall sensing device array is reset to starting position, by hall sensing device array in the horizontal direction, to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of the first skew; B3, hall sensing device array being reset to starting position, by hall sensing device array in the horizontal direction, pan-down default unit length, gathers current magnetic field data, obtains the Distribution of Magnetic Field matrix diagram of the 2nd skew; B4, the described hall sensing device array that resets are to described starting position, by described hall sensing device array in the horizontal direction, pan-down described unit length, again to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described 3rd skew.
In the present embodiment, owing to adopting the grid of typical case's value, therefore this default unit length can be half Gridding length, i.e. 1.5cm.
As a kind of citing of the present embodiment, the offset direction of this first bias magnetic field distribution moment system of battle formations can be, but not limited to the right or to the left. The offset direction of the 2nd bias magnetic field distribution moment system of battle formations can be, but not limited to downward or upward. In step B3, this hall sensing device array can be, but not limited to reset to starting position, but directly moves down a unit length, can obtain the 2nd bias magnetic field distribution moment system of battle formations equally. Example Distribution of Magnetic Field synthesis schematic diagram as shown in Figure 2, the magnetic field matrix diagram of this collection is non-bias magnetic field matrix diagram 201, the right bias magnetic field matrix diagram 202 offseting a default unit to the right respectively, do not return to the bottom right bias magnetic field matrix diagram 203 that starting position directly offsets downward a default unit, reset to starting position then offset downward a default unit the lower each matrix diagram of bias magnetic field matrix diagram 204 synthesize time consistent with the direction of this skew.
Step C: unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew and the Distribution of Magnetic Field matrix diagram of the 2nd skew are synthesized in superposition, obtain the first Distribution of Magnetic Field matrix diagram.
In the present embodiment, unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew and the Distribution of Magnetic Field matrix diagram of the 2nd skew are synthesized in superposition, when superposition, hall sensing device array central authorities are not collected the place of data, according to around central authorities four data that data collection point collects, carry out the interpolation processing of arithmetical av, to the point being in position, border, according to around border three data that data collection point collects, carry out the interpolation processing of arithmetical av, thus obtain described first Distribution of Magnetic Field matrix diagram. This first Distribution of Magnetic Field matrix diagram is the cold drawing Distribution of Magnetic Field matrix diagram of the PCB of normal operation.
In the present embodiment, the direction of this matrix diagram superposition synthesis is consistent with the direction of skew in step B.
Step D: this PCB working properly is added actuation signal, repeating step B to C, obtains the 2nd Distribution of Magnetic Field matrix diagram.
In the present embodiment, the PCB on detection platform is added actuation signal by exciting signal source, is specially: exciting signal source is launched actuation signal and imported PCB to produce magnetic field. Owing to the sensor in hall sensing device array gathers the magneticstrength of PCB, when sensor rotation, obtaining the magneticstrength send in all directions to upper analytical engine, this maximum direction of magneticstrength and this numerical value value as this sensor chosen by upper analytical engine. For the place of the non-image data of grid central authorities, according to around central authorities four data collected, carry out the interpolation processing of arithmetical av, thus obtain the 2nd Distribution of Magnetic Field matrix diagram. 2nd Distribution of Magnetic Field matrix diagram be normal operation PCB encourage time Distribution of Magnetic Field matrix diagram.
Step e: PCB to be measured be fixed on the detection platform of detection device, and add actuation signal, then hall sensing device array is returned to described starting position, repeating step B to C, obtains the 3rd Distribution of Magnetic Field matrix diagram.
In the present embodiment, the PCB of this normal operation is unloaded, change PCB to be measured, add actuation signal, repeating step B to C, obtain the 3rd Distribution of Magnetic Field matrix diagram. 3rd Distribution of Magnetic Field matrix diagram is the Distribution of Magnetic Field matrix diagram of PCB to be measured when encouraging.
Step F: the 2nd Distribution of Magnetic Field matrix diagram is subtracted the first Distribution of Magnetic Field matrix diagram, obtains the 4th Distribution of Magnetic Field matrix diagram, is normalized by the 4th Distribution of Magnetic Field matrix diagram and maps on gray-scale map, obtain the first Distribution of Magnetic Field gray-scale map.
In the present embodiment, the 2nd Distribution of Magnetic Field matrix diagram that upper analytical engine obtains normal operation pcb board subtracts the first Distribution of Magnetic Field matrix diagram, obtain the 4th Distribution of Magnetic Field matrix diagram, and after the 4th Distribution of Magnetic Field matrix diagram is normalized, map on gray-scale map, thus obtain the first Distribution of Magnetic Field gray scale, i.e. the gray-scale map of normal operation PCB. Its magnetic field minimum value corresponding grey scale 0 is mainly got in this mapping, maximum value corresponding grey scale 255.
Step G: the 3rd Distribution of Magnetic Field matrix diagram is subtracted the first Distribution of Magnetic Field matrix diagram, obtains the 5th Distribution of Magnetic Field matrix diagram, is normalized by the 5th Distribution of Magnetic Field matrix diagram and maps on gray-scale map, obtains the 2nd Distribution of Magnetic Field gray-scale map.
Step H: the 2nd Distribution of Magnetic Field gray-scale map is subtracted the first Distribution of Magnetic Field gray scale, obtain the fault magnetic field gray-scale map of PCB to be measured, each point on the gray-scale map of fault magnetic field is made threshold difference, obtain position of fault distribution plan, so that testing staff is according to position of fault distribution plan, obtain the detected result of PCB to be measured.
In the present embodiment, each point on gray-scale map, according to fault reference Distribution of Magnetic Field gray-scale map, is made threshold difference by upper analytical engine, and namely the gray scale on each point subtracts same threshold value, if typical case's value is 10, generates final position of fault distribution plan. And according to the numerical values recited on position of fault distribution plan, draw the probability distribution that position of fault produces. If more big at the numerical value of fault reference location map, then represent this place and occur that the probability of short trouble is more big.
Therefore, application the present embodiment technical scheme, PCB working properly is fixed on detection platform, by the level attitude of adjustment detection platform and hall sensing device array, open the magnetic field data that hall sensing device array gathers this PCB, obtain the Distribution of Magnetic Field matrix diagram of unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew and the 3rd skew respectively. The Distribution of Magnetic Field matrix diagram obtained is carried out the image procossing of superposition synthesis by upper analytical engine, obtains the first Distribution of Magnetic Field matrix diagram. Pcb board working properly is added actuation signal, repeats aforesaid method and obtain the 2nd Distribution of Magnetic Field matrix diagram. Change the circuit card on detection platform into PCB to be measured, repeat aforesaid method and obtain the 3rd Distribution of Magnetic Field matrix diagram. After the first, second, third Distribution of Magnetic Field matrix diagram obtained is carried out image procossing by upper analytical engine, obtaining the first Distribution of Magnetic Field gray-scale map and the 2nd Distribution of Magnetic Field gray-scale map respectively, what its distribution was corresponding is the Distribution of Magnetic Field gray-scale map of PCB working properly and the Distribution of Magnetic Field gray-scale map of PCB to be measured. Upper analytical engine continues first, second Distribution of Magnetic Field gray-scale map is carried out image procossing, obtain the fault magnetic field gray-scale map of this PCB to be measured, each point on this fault magnetic field gray-scale map is made threshold difference, obtain position of fault distribution plan, testing staff can according to the numerical value on position of fault distribution plan, the position of fault probability distribution obtaining PCB to be measured directly perceived, thus obtain detected result. Visible, the circuit structure being detected need to be familiar with compared to testing staff in prior art, the situation that detection efficiency is low, adopt technical solution of the present invention, testing staff intuitively can obtain position of fault probability distribution in position of fault distribution plan, the more big fault probability of numerical value is more high, it is to increase detection efficiency, and can effectively judge position of fault when breaking down in multiple place. In addition, the technical program need not very accurately obtain the complete magnetic field situation of PCB, while carrying out the method acquisition high precision of Images uniting after utilizing grid to offset, can reduce costs and manufacture craft difficulty.
Further, in the testing process of reality, different PCB may need the actuation signal of different frequency, adopts technical solution of the present invention after regulating exciting signal frequency, do not affect actual detected result, improve efficiency and the accuracy of detection further.
Embodiment 2
See Fig. 3, present embodiments provide a kind of PCB short-circuit detecting device based on hall sensing device array, the short-circuit detecting device being applicable to PCB, it mainly comprises: detection platform 301, Huo Er array retaining plate 302, multiple hall sensing device 303, rotation wheel 304, stepper-motor 305, upper analytical engine 306, actuation signal generator 307. Wherein, detect platform 301 to be connected by fixing support 308 with Huo Er array retaining plate 302. Wheel 304 is fixed on Huo Er array retaining plate 302 hall sensing device 303 with rotating. Stepper-motor 305 is connected with travelling belt, is fixed on Huo Er array retaining plate 302. Upper analytical engine 306 communicates to connect with each hall sensing device 303 in hall sensing array. Actuation signal source generator 307 is connected with detection platform 301.
Principle of work and the workflow of each parts are as follows:
Detection platform 301 is for fixing PCB, and this PCB can be (without short circuit or open circuit) working properly or PCB to be detected.
Huo Er array retaining plate 302 is for fixing hall sensing device array, Huo Er array retaining plate 302 is provided with multiple grid, each grid intersection point all fixes the rotation wheel 304 that is connected into a line by travelling belt, wherein rotates wheel 304 for rotating a hall sensing device 303 fixed thereon. This hall sensing device array comprises: for gathering multiple hall sensing devices 303 of magnetic field data
Hall sensing device 303 rotates for driving to rotate wheel 304.
Stepper-motor 305 is for driving travelling belt, so that driven rotary takes turns rotation. This stepper-motor is connected with travelling belt, is fixed on Huo Er array retaining plate 302. During work, stepper-motor starts to rotate drive travelling belt, travelling belt driven rotary wheel 304 rotation, thus makes to be fixed on the hall sensing device 303 rotated on wheel 304 and rotate.
In the present embodiment, in order to improve control accuracy, can adopting four phase motors, in order to improve moment, the stepper-motor that rotating speed can be selected slower so that it is can drive travelling belt, during work, typical case's rotating speed is every rotation completing a week for 10 seconds.
Upper analytical engine 306, for, in default collection period, control hall sensing device array gathers magnetic field data, and these magnetic field data is processed, finally obtains position of fault distribution plan. Upper analytical engine 306 can load various analysis software, and the detection improving the present invention further is precisely spent.
The more detailed workflow of this device and principle of work can be, but not limited to record accordingly see in embodiment 1.
Actuation signal generator 307 is for emitting radio frequency signal and imports to produce magnetic field in PCB, so that Hall sensor array can receive PCB Distribution of Magnetic Field information.
In the present embodiment, the fixing support 308 of this fixed test platform 301 and Huo Er array retaining plate 302 can be fixed link with a scale, for regulating the detection vertical distance of platform 301 with Huo Er array retaining plate 302.
As a kind of citing of the present embodiment, see Fig. 4, this device also comprises for being directed at the position of Huo Er array retaining plate 302 with detection platform 301 and confirm the laser positioning device 409 of Huo Er array retaining plate 302 position, and laser positioning device 409 is connected with Huo Er array retaining plate 302. In addition, one block of dismountable grid plate 310 can be increased between Hall sensor array and PCB retaining plate, when locating, laser positioning device 409 can be utilized, alignment grid plate on grid after carry out the dismounting of grid plate again and measure PCB Distribution of Magnetic Field, to be measured complete after, before needing the Distribution of Magnetic Field after measuring skew, again grid plate 310 is installed, utilize laser positioning device 409, grid plate obtains measurement once on just carrying out after offseting accurately.
In order to this detection device is better described, see Fig. 5, Fig. 5 is the simple schematic perspective view of this device preferred embodiment, as shown in the figure, comprise respectively: detect platform 301, Huo Er array retaining plate 302, multiple hall sensing device 303, stepper-motor 305, fixing support 308, laser pen 309, grid plate 310 can be dismantled, also comprise rotation wheel 304 not shown in the diagram, upper analytical engine 306, actuation signal source generator 307. In this citing, laser positioning device 409 is at least 4 laser pens 309, and each laser pen 309 is separately fixed at four summits of Huo Er array retaining plate 302. Gridding length in schematic diagram be highly typical case's value, user can regulate according to actual needs.
The more detailed workflow of this device and principle of work can be, but not limited to record accordingly see in embodiment 1.
Therefore, application the present embodiment technical scheme, PCB working properly is fixed on detection platform 301, by the level attitude of adjustment detection platform 301 with hall sensing device array, upper analytical engine 306 communicates to connect with each hall sensing device 303, control and open the magnetic field data that hall sensing device array gathers this PCB, obtain the Distribution of Magnetic Field matrix diagram of unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew and the 3rd skew respectively. The Distribution of Magnetic Field matrix diagram obtained is carried out the image procossing of superposition synthesis by upper analytical engine 306, obtains the first Distribution of Magnetic Field matrix diagram. Pcb board working properly is added actuation signal by actuation signal source generator 307, repeats aforesaid method and obtains the 2nd Distribution of Magnetic Field matrix diagram. Then change the circuit card on detection platform into PCB to be measured, repeat aforesaid method and obtain the 3rd Distribution of Magnetic Field matrix diagram. After the first, second, third Distribution of Magnetic Field matrix diagram obtained is carried out image procossing by upper analytical engine 306, obtaining the first Distribution of Magnetic Field gray-scale map and the 2nd Distribution of Magnetic Field gray-scale map respectively, what its distribution was corresponding is the Distribution of Magnetic Field gray-scale map of PCB working properly and the Distribution of Magnetic Field gray-scale map of PCB to be measured. Upper analytical engine continues first, second Distribution of Magnetic Field gray-scale map is carried out image procossing, obtain the fault magnetic field gray-scale map of this PCB to be measured, each point on this fault magnetic field gray-scale map is made threshold difference, obtain position of fault distribution plan, testing staff can according to the numerical value on position of fault distribution plan, the position of fault probability distribution obtaining PCB to be measured directly perceived, thus obtain detected result. Visible, the circuit structure being detected need to be familiar with compared to testing staff in prior art, the situation that detection efficiency is low, adopt technical solution of the present invention, testing staff intuitively can obtain position of fault probability distribution in position of fault distribution plan, the more big fault probability of numerical value is more high, it is to increase detection efficiency, and can effectively judge position of fault when breaking down in multiple place. In addition, the technical program need not very accurately obtain the complete magnetic field situation of PCB, while carrying out the method acquisition high precision of Images uniting after utilizing grid to offset, can reduce costs and manufacture craft difficulty.
Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or can also be distributed on multiple NE. Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme. Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Above-described enforcement mode, does not form the restriction to this technical scheme protection domain. The amendment done within any spirit in above-mentioned enforcement mode and principle, equivalent replace and improvement etc., all should be included within the protection domain of this technical scheme.
Claims (8)
1. based on the PCB method for detecting short circuit of hall sensing device array, it is characterised in that, comprising:
A, PCB working properly is fixed on detection device detection platform on, by hall sensing device array be directed at described PCB working properly, the position recording described hall sensing device array current is starting position;
B, open described hall sensing device array, in described hall sensing device array, each sensor rotates according to the default cycle and gathers magnetic field data, by adjusting described detection platform and the level attitude of described hall sensing device array, and the magnetic field data according to described collection, obtain the Distribution of Magnetic Field matrix diagram of unmigrated Distribution of Magnetic Field matrix diagram, the Distribution of Magnetic Field matrix diagram of the first skew, the Distribution of Magnetic Field matrix diagram of the 2nd skew and the 3rd skew successively;
The Distribution of Magnetic Field matrix diagram of C, the superposition described unmigrated Distribution of Magnetic Field matrix diagram of synthesis, the described first Distribution of Magnetic Field matrix diagram offset, the 2nd bias magnetic field distribution moment system of battle formations and described 3rd skew, obtains the first Distribution of Magnetic Field matrix diagram;
D, to described PCB working properly add actuation signal, repeating step B to C, obtain the 2nd Distribution of Magnetic Field matrix diagram;
E, PCB to be measured is fixed on the detection platform of detection device, and adds described actuation signal, more described hall sensing device array is returned to described starting position, repeating step B to C, obtain the 3rd Distribution of Magnetic Field matrix diagram;
F, described 2nd Distribution of Magnetic Field matrix diagram is subtracted described first Distribution of Magnetic Field matrix diagram, obtain the 4th Distribution of Magnetic Field matrix diagram, described 4th Distribution of Magnetic Field matrix diagram is normalized and maps on gray-scale map, obtain the first Distribution of Magnetic Field gray-scale map;
G, described 3rd Distribution of Magnetic Field matrix diagram is subtracted described first Distribution of Magnetic Field matrix diagram, obtain the 5th Distribution of Magnetic Field matrix diagram, described 5th Distribution of Magnetic Field matrix diagram is normalized and maps on gray-scale map, acquisition the 2nd Distribution of Magnetic Field gray-scale map;
H, the 2nd Distribution of Magnetic Field gray-scale map is subtracted the first Distribution of Magnetic Field gray scale, obtain the fault magnetic field gray-scale map of described PCB to be measured, each point on the gray-scale map of described fault magnetic field is made threshold difference, obtain position of fault distribution plan, so that testing staff is according to described position of fault distribution plan, obtain the detected result of described PCB to be measured.
2. the PCB method for detecting short circuit based on hall sensing device array according to claim 1, it is characterised in that, described step B specifically comprises:
B1, opening described hall sensing device array, in described hall sensing device array, each described sensor rotates according to the default cycle and collection period gathers magnetic field data, obtains described unmigrated Distribution of Magnetic Field matrix diagram;
B2, the described hall sensing device array that resets, to described starting position, by described hall sensing device array in the horizontal direction, to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described first skew;
B3, the described hall sensing device array that resets are to described starting position, and by described hall sensing device array in the horizontal direction, pan-down described unit length, gathers current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described 2nd skew;
B4, the described hall sensing device array that resets are to described starting position, by described hall sensing device array in the horizontal direction, pan-down described unit length, again to right translation default unit length, gather current magnetic field data, obtain the Distribution of Magnetic Field matrix diagram of described 3rd skew.
3. the PCB method for detecting short circuit based on hall sensing device array according to claim 1 and 2, it is characterised in that, described step C specifically comprises:
Unmigrated Distribution of Magnetic Field matrix diagram described in superposition, the Distribution of Magnetic Field matrix diagram of described first skew, the Distribution of Magnetic Field matrix diagram of described 2nd skew and the Distribution of Magnetic Field matrix diagram of the 3rd skew, when superposition, described hall sensing device array central authorities are not collected the place of data, according to the described central authorities data that around four data collection points collect, carry out the interpolation processing of arithmetical av, to the point being in position, border, according to around border three data that data collection point collects, carry out the interpolation processing of arithmetical av, thus obtain described first Distribution of Magnetic Field matrix diagram.
4. based on the PCB short-circuit detecting device of hall sensing device array, it is characterised in that, comprising:
For the detection platform of fixing PCB;
For the Huo Er array retaining plate of fixing hall sensing device array, described Huo Er array retaining plate is provided with multiple grid, each described grid intersection point all fixes the rotation wheel that is connected into a line by travelling belt, and wherein said rotation is taken turns for rotating a hall sensing device fixed thereon;
For driving described travelling belt, so that driving the described stepper-motor rotating wheel and rotating, described stepper-motor is connected with described travelling belt, is fixed on described Huo Er array retaining plate;
For, in default collection period, controlling described hall sensing device array and gather magnetic field data, and described magnetic field data are processed the final upper analytical engine obtaining position of fault distribution plan;
For emitting radio frequency signal and import to produce magnetic field in PCB so that Hall sensor array can receive the actuation signal source generator of PCB Distribution of Magnetic Field information;
Wherein, described detection platform and described Huo Er array retaining plate are connected by fixing support, and in described upper analytical engine and described hall sensing device array, each described hall sensing device communicates to connect, and described actuation signal source generator is connected with described detection platform.
5. the PCB short-circuit detecting device based on hall sensing device array according to claim 4, it is characterised in that, described stepper-motor is four phase step motor.
6. the PCB short-circuit detecting device based on hall sensing device array according to claim 4, it is characterised in that, also comprise:
For being directed at the position of described Huo Er array retaining plate and described detection platform and confirm the laser positioning device of described Huo Er array retaining plate position, described laser positioning device is connected with described Huo Er array retaining plate.
7. the PCB short-circuit detecting device based on hall sensing device array according to claim 6, it is characterized in that, described laser positioning device is at least 4 laser pens, described laser positioning device is connected with described Huo Er array retaining plate, specifically comprises: each described laser pen is separately fixed at four summits of described Huo Er array retaining plate.
8. the PCB short-circuit detecting device based on hall sensing device array according to claim 4, it is characterised in that, described hall sensing device array comprises: for gathering multiple hall sensing devices of magnetic field data.
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| CN103983887B (en) * | 2014-05-23 | 2017-05-10 | 工业和信息化部电子第五研究所 | Automatic locating method and device for open circuit of circuit |
| CN109270436B (en) * | 2018-10-24 | 2021-04-20 | 深圳市科汇龙科技有限公司 | High-efficient full-automatic quality of PCB circuit board and integrative equipment of outward appearance detection |
| CN113567761A (en) * | 2021-07-27 | 2021-10-29 | 成都通量科技有限公司 | CMOS full-integrated electromagnetic detection radio frequency front-end sensor |
| CN113671325B (en) * | 2021-08-18 | 2022-10-11 | 云南电网有限责任公司大理供电局 | Terminal partial discharge monitoring method and system based on high-frequency electric field change |
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Inventor after: Huang Shuqiang Inventor after: Ma Zhenyuan Inventor after: Zeng Jielin Inventor after: Zhou Hongchun Inventor after: Lv Shuanghuan Inventor after: Zhang Huanming Inventor before: Huang Shuqiang Inventor before: Ma Zhenyuan Inventor before: Zeng Jielin Inventor before: Zhou Chunhong Inventor before: Lv Shuanghuan Inventor before: Zhang Huanming |
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