CN114487570A - Method and system for removing interference of fusing current test level of gold bonding wire welding equipment - Google Patents
Method and system for removing interference of fusing current test level of gold bonding wire welding equipment Download PDFInfo
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- CN114487570A CN114487570A CN202210342813.3A CN202210342813A CN114487570A CN 114487570 A CN114487570 A CN 114487570A CN 202210342813 A CN202210342813 A CN 202210342813A CN 114487570 A CN114487570 A CN 114487570A
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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Abstract
The invention relates to the technical field of Internet of things, in particular to a method and a system for removing interference of a fusing current test level of gold bonding wire welding equipment, wherein the method comprises the steps of obtaining the level of an RS485 bus pin and judging whether the interference exists or not, and if so, inhibiting the level interference; if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level; and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level. The method provided by the invention firstly suppresses the level interference of the pins, then adjusts the differential level, finally adjusts the common mode level, and processes the interference of three forms according to the sequence, thereby ensuring the stability and effectiveness of the transmitted data and improving the accuracy of the test.
Description
Technical Field
The invention relates to the technical field of Internet of things, in particular to a method and a system for removing interference of a fusing current test level of gold bonding wire welding equipment.
Background
The bonding gold wire is also called as a ball bonding gold wire because the end of the gold wire is burned into a small ball by flame during welding and then is ball bonded with a chip electrode.
The spherical shape of the gold wire directly affects the bonding quality. Generally, the higher the purity of the gold wire, the better the roundness and uniformity of the formed gold ball. 99.999% Au can form a perfect sphere, but the bonding strength is not good. The addition of trace elements can increase the strength of the welding part, but has adverse effect on gold wire balling. Therefore, the amount of the added elements is small in practice, the high purity of the gold is ensured as much as possible, and the purity of the gold is required to be more than 99.99%.
The quality of gold wire welding is related to the characteristics of the gold wire and the fusing current of welding equipment, and the melting balling of the gold wire can be influenced by too large or too small current. Therefore, during the production or use of gold bonding wire welding equipment, the fusing current of the welding equipment needs to be tested. The test adopts a melting current tester, and in the test process, signal transmission between welding equipment and the tester is involved, and an RS485 bus is generally adopted to connect the welding equipment and the tester in production. Level interference is frequently encountered in the signal transmission process, and because the control requirement on welding current of welding equipment during working is very high, the acceptable degree of the level interference during testing is very low, and the requirement is very strict. How to suppress the level interference during the test is a problem to be solved.
Disclosure of Invention
Based on this, the embodiment of the present invention provides a method for removing interference of a fuse current test level of a gold bonding wire welding device, which aims to solve at least one problem in the background art.
The embodiment of the invention is realized in such a way that the method for removing the interference of the fusing current test level of the gold bonding wire welding equipment comprises the following steps:
acquiring the level of an RS485 bus pin and judging whether interference exists, if so, suppressing the level interference;
if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level;
and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level.
In one embodiment, the present invention further provides a fuse current test level interference removing system for a gold bonding wire welding device, where the fuse current test level interference removing system for a gold bonding wire welding device includes:
welding equipment; and
a tester in communication with the welding device, the tester configured to perform the method for fuse current test level interference cancellation for gold bond wire welding devices according to any one of the embodiments of the present invention.
The method provided by the invention firstly suppresses the level interference of the pins, then adjusts the differential level, finally adjusts the common mode level, and processes the interference of three forms according to the sequence, thereby ensuring the stability and effectiveness of the transmitted data and improving the accuracy of the test. More specifically, for different forms of level interference, the invention provides different stabilizing methods, and the final realization of the methods is ensured by hardware, the reliability is high, the hardware stabilizing level is not easily influenced by data fluctuation, and the stability is good.
Drawings
FIG. 1 is a flowchart of a method for removing a fuse test level disturbance of a gold wire bonding device according to an embodiment;
FIG. 2 is a block diagram of the internal structure of the tester in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of the present application.
As shown in fig. 1, in an embodiment, a method for removing interference of a fusing current test level of a gold bond wire bonding device is provided, which specifically includes the following steps:
acquiring the level of an RS485 bus pin and judging whether interference exists, if so, suppressing the level interference;
if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level;
and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level.
In this embodiment, firstly, the level of a single bus pin is respectively stabilized, the level interference is often related to a specific pin, is not the interference of the whole signal, and may be caused by poor contact of a certain pin, or the electric signal caused by the fault of a single communication line is damaged or increased, at this moment, the level of each pin needs to be respectively detected and processed, the mode is detected through the pin, the problem of wiring itself does not need to be analyzed, the problem can be simplified, and the problem is processed from a receiving end or a sending end.
In this embodiment, after the level interference of a single wire is processed, the differential level needs to be adjusted to ensure that the interference of the differential level is not caused by the interference of a single pin.
In this embodiment, further, the common mode level is processed, and based on the processing result of the level of the single pin and the processing result of the differential level, it can be ensured that the interference of the common mode level only comes from the level difference between the ground wires at the two ends, so that the stabilizing process in the previous step reduces variables for processing the common mode level, so that the common mode level adjustment is more targeted, and the effectiveness of the common mode level adjustment is improved.
The method provided by the invention firstly suppresses the level interference of the pins, then adjusts the differential level, finally adjusts the common mode level, and processes the interference of three forms according to the sequence, thereby ensuring the stability and effectiveness of the transmitted data and improving the accuracy of the test. More specifically, for different forms of level interference, the invention provides different stabilizing methods, and the final realization of the methods is ensured by hardware, the reliability is high, the hardware stabilizing level is not easily influenced by data fluctuation, and the stability is good.
In an embodiment of the present invention, the acquiring the level of the RS485 bus pin and determining whether there is interference includes:
collecting N values of high level of RS485 bus pin, and recording as X1、X2…Xn；
Calculating X1、X2…XnMean value of (A) Xa；
Obtaining the current high level value of RS485 bus pin, recording as XiCalculating the high level deviation Xd=（Xi-Xa）/Xa*100%；
If XdIf the interference is larger than or equal to the set threshold value, judging that high-level interference exists;
collecting N values of low level of RS485 bus pin and recording as Y1、Y2…Yn；
Calculating Y1、Y2…YnMean value of (Y)a；
Obtaining the current low level value of the RS485 bus pin and recording as YiCalculating a low level deviation Yd=（Yi-Ya）/Ya*100%；
If Y isdAnd if the interference is larger than or equal to the set threshold value, judging that low-level interference exists.
In this embodiment, for a single pin, including two specific forms of high-level interference and low-level interference, the present invention provides a specific method for determining level interference, which combines a level value in an electrical near-running state to determine a reference for determining interference. The set threshold value can be 0.7-0.85, the range can effectively identify interference, common interference can be ignored, and the accuracy is high in practice. It should be noted that, for both high level and low level, the absolute value thereof may be used for calculation, that is, all the values mentioned above in the present embodiment may be used as the value for calculation.
In one embodiment of the invention, the acquisition of the N values of the high level or the low level of the RS485 bus pin is carried out in the following manner:
reading level value of pin to obtain X1Or Y1；
After a set time interval t0Post-read level value to X2Or Y2；
From X1/X2*t0Or Y1/Y2*t0To obtain t1Passing through t1Reading level values after a time interval to obtain X3Or Y3；
Repeating the above steps, updating the time interval and reading the level value.
In this embodiment, the acquired time interval is dynamically adjusted by calculating the conditions of the data acquired twice before and after, so that the change of tracking interference of the acquisition action dynamics can be realized, and when the change is large, the time interval is reduced, so that more accurate sampling is realized. In general, it will be appreciated that the time interval tn= Xn/Xn+1*tn-1Or tn=Yn/Yn+1*tn-1N in this case<N is a positive integer.
In an embodiment of the present invention, the suppressing the level interference includes:
if the high level interference exists, connecting the pin of the RS485 bus in series with a high wave amplitude limiting circuit;
if the low level interference exists, the pin of the RS485 bus is connected with a low wave amplitude limiting circuit in series.
In this embodiment, after the level interference of the pin is detected, the amplitude limiting circuit on the communication line is controlled to access the loop to realize amplitude limiting adjustment; the present invention does not relate to the improvement of the clipping hardware, and is not described herein; it should be noted that the present invention provides a control mode in which the limiter circuit is controlled to be connected to the bus loop or bypassed from the bus loop through the controllable switch.
In an embodiment of the present invention, the acquiring a differential level between two communication lines of the RS485 bus includes:
acquiring a threshold level of a tester;
reading the differential level between two communication lines of the RS485 bus at set time intervals in the idle state of the RS485 bus;
comparing the magnitude of each read differential level with the threshold level respectively;
and if one differential level is smaller than the threshold level, adjusting the differential level.
In this embodiment, the differential level is the level difference between two communication lines, and the tester can only recognize signals when the level difference reaches a certain value, so the threshold level is determined by the specific hardware design of the tester, and can be set between 3.7V and 12V according to the range of the tested fusing current.
In one embodiment of the present invention, performing differential level adjustment includes:
calculating the difference value between the minimum differential level and the threshold level, and calculating the ratio w of the level difference value to the threshold level;
according to R = R0(1-w) adjusting the resistance value of the variable resistor, wherein R is the adjusted resistance value of the variable resistor, and R0The resistance value before the variable resistor is adjusted.
In the embodiment, the adjustment of the differential level is realized by controlling the variable resistor connected into the loop, and the adjustment belongs to the hardware adjustment in the loop, so that the reliability is good, and the influence from the outside is small. Specifically, the voltage-dependent resistor can be used for realizing the voltage-dependent resistor, and the resistance value of the voltage-dependent resistor connected into a loop can be controlled by applying different voltages to the voltage-dependent resistor, so that the purpose of adjusting the differential level is achieved.
In an embodiment of the present invention, the obtaining a common mode level of an RS485 bus between the welding device and the tester includes:
obtaining the common mode level to the ground of the welding equipment, and recording as V1；
Obtaining the level difference between the ground wire of the welding equipment and the ground wire of the tester, and recordingIs a V2；
The common mode level V of the RS485 bus between the welding equipment and the tester3= V1+ V2。
In this embodiment, limiting the common mode level can ensure the consistency of the two communication buses and suppress the common mode interference.
In an embodiment of the present invention, the determining whether the common mode level is within a preset range includes:
and judging whether the common mode level is smaller than-7V or larger than 12V, if so, exceeding a preset range.
In this embodiment, a range of acceptable common mode interference is given, beyond which common mode interference rejection is required.
In one embodiment of the present invention, adjusting the common mode level comprises:
and outputting a control signal to drive the switch to connect the ground wire of the welding equipment with the ground wire of the tester.
In this embodiment, the common mode interference is suppressed by connecting the ground lines of the two devices. The connection is realized by controlling the conduction of the corresponding ground wire connection switch, and is not manual field connection.
The embodiment of the invention also provides a system for removing the interference of the fusing current test level of the gold bonding wire welding equipment, which comprises the following components:
welding equipment; and
the tester is communicated with the welding equipment and is used for executing the method for removing the fusing current test level interference of the gold bonding wire welding equipment according to the embodiment of the invention.
In this embodiment, the system for removing the fuse current test level interference of the gold bonding wire welding equipment firstly suppresses the level interference of the pin, then adjusts the differential level, and finally adjusts the common mode level to process the interference of the three forms according to the sequence, so that the stability and effectiveness of transmitted data can be ensured, and the test accuracy is improved. More specifically, for different forms of level interference, the invention provides different stabilizing methods, and the final realization of the methods is ensured by hardware, the reliability is high, the hardware stabilizing level is not easily influenced by data fluctuation, and the stability is good.
FIG. 2 shows an internal block diagram of the tester in one embodiment. As shown in fig. 2, the tester includes a processor, a memory, a network interface, an input device, and a display screen connected by a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The nonvolatile storage medium of the tester stores an operating system and also stores a computer program, and when the computer program is executed by a processor, the computer program can enable the processor to realize the method for removing the fusing current test level interference of the gold bonding wire welding equipment provided by the embodiment of the invention. The internal memory may also store a computer program, and when the computer program is executed by the processor, the computer program may enable the processor to execute the method for removing the fuse current test level interference of the gold bond wire bonding device according to the embodiment of the present invention. The display screen of the tester can be a liquid crystal display screen or an electronic ink display screen, and the input device of the tester can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the tester, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the configuration shown in fig. 2 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the test meter to which the present application is applied, and that a particular test meter may include more or fewer components than those shown, or some components may be combined, or have a different arrangement of components.
In one embodiment, a tester is provided, the tester comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
acquiring the level of an RS485 bus pin and judging whether interference exists, if so, suppressing the level interference;
if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level;
and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which, when executed by a processor, causes the processor to perform the steps of:
acquiring the level of an RS485 bus pin and judging whether interference exists, if so, suppressing the level interference;
if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level;
and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in various embodiments may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A method for removing interference of a fusing current test level of gold bonding wire welding equipment is characterized by comprising the following steps:
acquiring the level of an RS485 bus pin and judging whether interference exists, if so, suppressing the level interference;
if not, or after the suppression processing, acquiring a differential level between two communication lines of the RS485 bus, judging whether the differential level reaches a threshold level, and if not, adjusting the differential level;
and if so, obtaining the common mode level of the RS485 bus between the welding equipment and the tester, judging whether the common mode level is in a preset range, and if not, adjusting the common mode level.
2. The method for removing interference of the level of the fuse current test of the gold bonding wire welding device according to claim 1, wherein the obtaining the level of the RS485 bus pin and determining whether the interference exists comprises:
collecting N values of high level of RS485 bus pin, and recording as X1、X2…Xn；
Calculating X1、X2…XnMean value of (A) Xa；
Obtaining the current high level value of RS485 bus pin, and recording as XiCalculating the high level deviation Xd=（Xi-Xa）/Xa*100%；
If XdIf the interference is larger than or equal to the set threshold value, judging that high-level interference exists;
collecting N values of low level of RS485 bus pin and recording as Y1、Y2…Yn；
Calculating Y1、Y2…YnMean value of (Y)a；
Obtaining the current low level value of the RS485 bus pin and recording as YiCalculating a low level deviation Yd=（Yi-Ya）/Ya*100%；
If Y isdAnd if the interference is larger than or equal to the set threshold value, judging that low-level interference exists.
3. The method for removing the interference of the test level of the fusing current of the gold bonding wire welding device according to claim 2, wherein the N values of the high level or the low level of the pin of the RS485 bus are collected by the following method:
reading level value of pin to obtain X1Or Y1；
After a set time interval t0Post-read level value to X2Or Y2；
From X1/X2*t0Or Y1/Y2*t0To obtain t1Passing through t1Reading level values after a time interval to obtain X3Or Y3；
Repeating the above steps, updating the time interval and reading the level value.
4. The method for removing the disturbance of the fuse current test level of the gold bonding wire bonding equipment according to claim 1, wherein the suppressing the disturbance of the level comprises:
if the high level interference exists, connecting the pin of the RS485 bus in series with a high wave amplitude limiting circuit;
if the low level interference exists, the pin of the RS485 bus is connected with a low wave amplitude limiting circuit in series.
5. The method for removing the interference of the test level of the fusing current of the gold bonding wire welding device as claimed in claim 1, wherein the obtaining the differential level between the two communication lines of the RS485 bus comprises:
acquiring a threshold level of a tester;
reading the differential level between two communication lines of the RS485 bus at set time intervals in the idle state of the RS485 bus;
comparing the magnitude of each read differential level with the threshold level respectively;
and if one differential level is smaller than the threshold level, adjusting the differential level.
6. The method for removing the interference of the test level of the fusing current of the gold bonding wire welding device according to claim 5, wherein the adjusting the differential level comprises:
calculating the difference value between the minimum differential level and the threshold level, and calculating the ratio w of the level difference value to the threshold level;
according to R = R0(1-w) adjusting the resistance value of the variable resistor, wherein R is the adjusted resistance value of the variable resistor, and R0The resistance value before the variable resistor is adjusted.
7. The method for removing the interference of the test level of the fusing current of the gold bonding wire welding device according to claim 1, wherein the obtaining the common mode level of the RS485 bus between the welding device and the tester comprises:
obtaining the common mode level to ground of the welding equipment, and recording as V1；
Obtaining the level difference between the ground wire of the welding equipment and the ground wire of the tester, and recording as V2；
The common mode level V of the RS485 bus between the welding equipment and the tester3= V1+ V2。
8. The method of claim 7, wherein the determining whether the common mode level is within a predetermined range comprises:
and judging whether the common mode level is smaller than-7V or larger than 12V, if so, exceeding a preset range.
9. The method of claim 1, wherein adjusting the common mode level comprises:
and outputting a control signal to drive the switch to connect the ground wire of the welding equipment with the ground wire of the tester.
10. A system for removing the fuse current test level interference of gold bonding wire welding equipment is characterized by comprising:
welding equipment; and
a tester in communication with the welding device, the tester configured to perform the bond wire welding device fusing current test level disturbance removal method of any of claims 1-9.
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| CN116318070A (en) * | 2023-05-16 | 2023-06-23 | 深圳锐爱电子有限公司 | Method for automatically removing level interference of intelligent stirring system of Internet of things |
| CN116318070B (en) * | 2023-05-16 | 2023-07-25 | 深圳锐爱电子有限公司 | Method for automatically removing level interference of intelligent stirring system of Internet of things |
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