CN108919032A - A kind of Mesh line test circuit and test method - Google Patents
A kind of Mesh line test circuit and test method Download PDFInfo
- Publication number
- CN108919032A CN108919032A CN201810837973.9A CN201810837973A CN108919032A CN 108919032 A CN108919032 A CN 108919032A CN 201810837973 A CN201810837973 A CN 201810837973A CN 108919032 A CN108919032 A CN 108919032A
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- Prior art keywords
- tie point
- resistance
- circuit
- variable resistance
- test
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of Mesh line test circuits and test method, the test circuit to include：Resistance bridge circuit, voltage comparator circuit and warning circuit；Mesh route is connect with the resistance bridge circuit, and the resistance bridge circuit is connect with the voltage comparator circuit input terminal, and the voltage comparator circuit output end is connect with the warning circuit；Test method is to measure the variation of voltage in circuit by changing test circuit to judge whether Mesh line has the situation of short circuit.Beneficial effects of the present invention are：By the way that the tamper Mesh route of touch-control display product is drawn by jig and is connected on test circuit of the present invention, Mesh line can accurately be tested is shorted with each other situation two-by-two, and what can intuitively be provided will test result, test operation is simple, is convenient for determining, instead of the mode of operation of manual multimeter, human error can also be prevented and cause test inaccurate and reduce the risk of damage of product and scratch.
Description
Technical field
The present invention relates to the test method of touch display screen and field of circuit technology, in particular to a kind of band Mesh
The Mesh line test circuit and test method of the anti-touching display screen taken out stitches.
Background technique
Financial field has become the common means of payment using POS machine bankcard consumption with the development of payment technology.Cause
This, provide a kind of POS machine Anti-dismounting structure becomes to be highly desirable to reach safe bankcard consumption.It needs with tamper safety
High product and each components wherein needs design to have tamper mesh route on touching display screen, tamper route is 4 under normal circumstances
Root lead, lead guide to the silver paste route of product from one end circuit board interface of product, finally draw from the other end of product.?
After touch-control shows product installation, the mesh line at both ends is connect with mainboard, and mainboard can identify whether product has normal access, such as
Fruit disassembles product, will destroy mesh line, mainboard, which can detecte, identifies and alarm or stop related work, or " tears open to reach
The function of machine self-destruction ".
Mesh route, due to the possibility for opening short circuit of silver paste, needs relevant detection technique, particularly in product processing procedure
The short-circuit test of Mesh route, 4 Mesh lines there may be it is short-circuit two-by-two a possibility that, current detection method can pass through visitor
The mainboard at family measures to detect, or by tools such as multimeters.But no matter all deposited using client's mainboard or multimeter detection
In low efficiency, costly problem is easy to determine fault, and need certain professional knowledge personnel can just accomplish.
Summary of the invention
It, can be with to solve the above problems, the purpose of the present invention is to provide a kind of Mesh line test circuit and test method
It solves the problems, such as that Mesh line short testing efficiency is low, costly, makes test that there is the feasibility of batch jobs, convenient for operation.
The present invention provides a kind of Mesh lines to test circuit, which includes：Resistance bridge circuit, voltage comparator circuit and report
Alert circuit；Mesh route is connect with the resistance bridge circuit, and the resistance bridge circuit and the voltage comparator circuit input terminal connect
It connects, the voltage comparator circuit output end is connect with the warning circuit.
The resistance bridge circuit includes：Respectively with four points of connection A, B, C and D of Mesh connection, the tie point A
It connect, is grounded after the tie point D series resistor R2, and be parallel with capacitor C1, the company on the resistance R2 with voltage VREF
Contact A is connected with the tie point B by variable resistance VR1, and passing through between the tie point A and the tie point C can power transformation
VR3 connection is hindered, the tie point B is connected with the tie point C by variable resistance VR5, the tie point B and the tie point
It is connected between D by variable resistance VR2, is connected between the tie point C and the tie point D by variable resistance VR4, it is described
Equivalent resistance between tie point A and the tie point B is Rab, the equivalent electricity between the tie point A and the tie point C
Resistance is Rac, and the equivalent resistance between the tie point B and the tie point C is Rbc, the tie point B and the tie point D
Between equivalent resistance be Rbd, equivalent resistance between the tie point C and the tie point D is Rcd；
The voltage comparator circuit includes operational amplifier IC1, the input terminal 3 of the operational amplifier IC1 and the company
Contact D connection, the input terminal 2 of the operational amplifier IC1 are connect by resistance R1 with voltage VREF, the resistance R1 and described
It is connected to variable resistance VR6 and capacitor C2, the variable resistance VR6 and the capacitor C2 in parallel between input terminal 2 to be grounded, institute
The output end 6 for stating operational amplifier IC1 is grounded by capacitor C3；
The warning circuit includes：Sequentially connected resistance R3 and warning device D1, the one end the resistance R3 with it is described defeated
Outlet 6 connects, and the other end of the resistance R3 is connect with the warning device D1 input terminal, the warning device D1 output termination
Ground.
As further improvement of the invention, the variable resistance VR1, the variable resistance VR2, the variable resistance
VR3, the variable resistance VR4, the variable resistance VR5 and the variable resistance VR6 adjustable Standard resistance range be 50K Ω~
500KΩ。
As further improvement of the invention, the warning device D1 is light emitting diode or buzzer.
The present invention also provides a kind of test method based on Mesh line test circuit, which includes：
Step 1, normal four Mesh routes are respectively connected to tie point A, tie point B, tie point C and tie point D
In, at this point, the equivalent resistance between the tie point A and the tie point B is Rab, the tie point A and the tie point C
Between equivalent resistance be Rac, equivalent resistance between the tie point B and the tie point C is Rbc, the tie point B and
Equivalent resistance between the tie point D is Rbd, and the equivalent resistance between the tie point C and the tie point D is Rcd, institute
State equivalent resistance between tie point A and the tie point D be variable resistance VR1, variable resistance VR2, variable resistance VR3, can
Power transformation hinders the resistance resistor bridge of VR4 and variable resistance VR5 composition；
Step 2, variable resistance VR1, variable resistance VR2, variable resistance VR3, variable resistance VR4, variable resistance VR5 are adjusted
With variable resistance VR6, it is ensured that the electricity of input terminal 2 of the voltage of the input terminal 3 of operational amplifier IC1 lower than operational amplifier IC1
The output end 6 of pressure, operational amplifier IC1 exports low level, so that the warning device D1 connecting with operational amplifier IC1 is not rung
It answers, completes Mesh line and test circuit debugging；
Step 3, by the Mesh line debugged test circuit by jig and Mesh connection to be measured, and in Mesh line
Test circuit is passed through voltage VREF, starts to test：
When short-circuit between any two of Mesh route to be measured or more, the tie point A and the tie point D it
Between resistance bridge resistance value reduce, the voltage of the input terminal 3 of operational amplifier IC1 increases, and defeated higher than operational amplifier IC1
Enter the voltage at end 2, the output end 6 of operational amplifier IC1 exports high level, so that the warning device D1 is responded.
Improved as of the invention further, the resistance value of the variable resistance VR1 multiplied by the variable resistance VR4 resistance value
Resistance value not equal to the variable resistance VR2 multiplied by the variable resistance VR3 resistance value.
Beneficial effects of the present invention are：By the way that touch-control is shown that the tamper Mesh route of product is drawn and is connected to by jig
On test circuit of the present invention, can accurately test Mesh line is shorted with each other situation two-by-two, and can intuitively provide
Will test as a result, test operation it is simple, convenient for determining, instead of the mode of operation of manual multimeter, can also prevent artificially accidentally
Difference causes test inaccurate and reduces the risk of damage of product and scratch.
Detailed description of the invention
Fig. 1 is a kind of Mesh cable architecture signal of Mesh line test circuit and test method described in the embodiment of the present invention
Figure；
Fig. 2 is a kind of circuit function module figure of the test of Mesh line circuit and test method described in the embodiment of the present invention；
Fig. 3 is a kind of test circuit diagram of the test of Mesh line circuit and test method described in the embodiment of the present invention.
In figure, 1, the substrate of product；2, silver paste or ITO lead；3, FPC or interface or spy point on pcb board；4, FPC or
Pcb board.
Specific embodiment
The present invention is described in further detail below by specific embodiment and in conjunction with attached drawing.
A kind of Mesh line test circuit, the test circuit described in the embodiment of the present invention include：Resistance bridge circuit, voltage ratio
Compared with circuit and warning circuit；Mesh route is connect with resistance bridge circuit, and resistance bridge circuit is connect with voltage comparator circuit input terminal,
Voltage comparator circuit output end is connect with warning circuit.
Resistance bridge circuit includes four points of connection A, B, C and D with Mesh connection respectively, tie point A and voltage
VREF connection is grounded after tie point D series resistor R2, and is parallel with capacitor C1 on resistance R2, and tie point A and tie point B pass through
Variable resistance VR1 connection, is connected between tie point A and tie point C by variable resistance VR3, and tie point B and tie point C pass through
Variable resistance VR5 connection, is connected between tie point B and tie point D by variable resistance VR2, between tie point C and tie point D
It is connected by variable resistance VR4, the equivalent resistance between tie point A and tie point B is Rab, between tie point A and tie point C
Equivalent resistance be Rac, equivalent resistance between tie point B and tie point C is Rbc, between tie point B and tie point D etc.
Effect resistance is Rbd, and the equivalent resistance between tie point C and tie point D is Rcd.
Voltage comparator circuit includes operational amplifier IC1, and the input terminal 3 of operational amplifier IC1 is connect with tie point D, fortune
The input terminal 2 for calculating amplifier IC1 is connect by resistance R1 with voltage VREF, the input terminal 2 of resistance R1 and operational amplifier IC1 it
Between be connected in parallel variable resistance VR6 and capacitor C2, variable resistance VR6 and capacitor C2 are grounded, the output of operational amplifier IC1
End 6 is grounded by capacitor C3；C1, which is parallel on R2, plays pressure stabilization function, and C2, which is parallel on VR6, plays voltage regulation filtering, and C3 plays filtering
The effect of pressure stabilizing；When the voltage of the input terminal 3 of operational amplifier IC1 is higher than the voltage of input terminal 2, operational amplifier IC1's
Output end 6 can export high level.
Warning circuit includes：Sequentially connected resistance R3 and warning device D1, the one end resistance R3 are connect with output end 6, electricity
The other end of resistance R3 is connect with warning device D1 input terminal, warning device D1 output end ground connection；High level drives light emitting diode
It shines or buzzer responds.
Further, the variable resistance VR1, the variable resistance VR2, the variable resistance VR3, the variable resistance
The adjustable Standard resistance range of VR4, the variable resistance VR5 and the variable resistance VR6 are 50K Ω~500K Ω.
Further, warning device D1 is light emitting diode or buzzer；It can according to the actual situation, in different environment
Use different warning devices.
The present invention also provides a kind of test method based on Mesh line test circuit, which includes：
Step 1, normal four Mesh routes are respectively connected to tie point A, tie point B, tie point C and tie point D
In, at this point, the equivalent resistance between tie point A and tie point B is Rab, the equivalent resistance between tie point A and tie point C is
Rac, the equivalent resistance between tie point B and tie point C are Rbc, and the equivalent resistance between tie point B and tie point D is Rbd,
Equivalent resistance between tie point C and tie point D is Rcd, and the equivalent resistance between tie point A and tie point D is variable resistance
The resistance resistor bridge of VR1, variable resistance VR2, variable resistance VR3, variable resistance VR4 and variable resistance VR5 composition；
Step 2, variable resistance VR1, variable resistance VR2, variable resistance VR3, variable resistance VR4, variable resistance VR5 are adjusted
With variable resistance VR6, it is ensured that the electricity of input terminal 2 of the voltage of the input terminal 3 of operational amplifier IC1 lower than operational amplifier IC1
The output end 6 of pressure, operational amplifier IC1 exports low level, so that the warning device D1 connecting with operational amplifier IC1 is not rung
It answers, completes Mesh line and test circuit debugging；
Step 3, by the Mesh line debugged test circuit by jig and Mesh connection to be measured, and in Mesh line
Test circuit is passed through voltage VREF, starts to test：
When short-circuit between any two of Mesh route to be measured or more, the tie point A and the tie point D it
Between resistance bridge resistance value reduce, the voltage of the input terminal 3 of operational amplifier IC1 increases, and defeated higher than operational amplifier IC1
Enter the voltage at end 2, the output end 6 of operational amplifier IC1 exports high level, so that the warning device D1 is responded；When Mesh line
When without short circuit, voltage value does not change, and warning device D1 is not responding to.
Further, the resistance value of variable resistance VR1 is not equal to the resistance of variable resistance VR2 multiplied by the resistance value of variable resistance VR4
It is worth the resistance value multiplied by variable resistance VR3.
When specific test：
A kind of touch-control as shown in Figure 1 shows the tamper Mesh route of product, including：The substrate 1 of product has on substrate 1
Silver paste or ITO lead 2；Two FPC or the pcb board 4 being connected on substrate 1；And interface or spy point on FPC or pcb board 4
3.A, B, C, D represent 4 Mesh routes, and A, B, C, D are independent from each other, normal tetra- Mesh lines of product A, B, C, D itself
The connection between two FPC or pcb board 4 is needed, but cannot be shorted with each other between any two.
The situation for whether having short circuit between the tamper Mesh line of product is shown to test above-mentioned touch-control, used as
Test circuit shown in Fig. 2, tetra- Mesh lines of A, B, C, D respectively be linked into test circuit resistance bridge circuit, resistance bridge electricity
Road is connect with voltage comparator circuit, and last voltage comparator circuit output end is connected to warning circuit.
The physical circuit connection of test circuit shown in Fig. 2 is as shown in figure 3, with jig by the interface on FPC or pcb board 4
Or it visits point 3 and draws, and connect respectively with A, B, C, D four points of connection of circuit shown in Fig. 3.When test, it is passed through to test circuit
VREF, if fruit product is that normally, mutually not short-circuit between tetra- Mesh lines of A, B, C, D, light emitting diode does not work；As A, B, C, D
There are any two or multiple short circuits between four Mesh lines, the equivalent resistance between A and D is VR1, VR2, VR3, VR4 and VR5 group
At resistance resistor bridge, resistance resistor bridge total value will reduce, increase 3 voltage of input terminal of operational amplifier IC1, increase after electricity
Comparator is pressed to export high level, high level drives lumination of light emitting diode.
Resistance can be less than 500 Ω, in order to which circuit can be worked normally when Mesh line short, it is proposed that by VR1, VR2, VR3,
The adjustable resistance range of VR4, VR5 and VR6 meet VR1 × VR4 not equal to VR2 × VR3 between 50K Ω -500K Ω.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of Mesh line tests circuit, which is characterized in that the test circuit includes：Resistance bridge circuit, voltage comparator circuit and
Warning circuit；Mesh route is connect with the resistance bridge circuit, the resistance bridge circuit and the voltage comparator circuit input terminal
Connection, the voltage comparator circuit output end are connect with the warning circuit；
The resistance bridge circuit includes four points of connection A, B, C and D with Mesh connection respectively, the tie point A and electricity
VREF connection is pressed, is grounded after the tie point D series resistor R2, and be parallel with capacitor C1 on the resistance R2, the tie point A
It is connected with the tie point B by variable resistance VR1, passes through variable resistance VR3 between the tie point A and the tie point C
Connection, the tie point B is connected with the tie point C by variable resistance VR5, between the tie point B and the tie point D
It is connected, is connected between the tie point C and the tie point D by variable resistance VR4, the connection by variable resistance VR2
Equivalent resistance between point A and the tie point B is Rab, and the equivalent resistance between the tie point A and the tie point C is
Rac, the equivalent resistance between the tie point B and the tie point C is Rbc, between the tie point B and the tie point D
Equivalent resistance be Rbd, equivalent resistance between the tie point C and the tie point D is Rcd；
The voltage comparator circuit includes operational amplifier IC1, the input terminal 3 of the operational amplifier IC1 and the tie point D
The input terminal 2 of connection, the operational amplifier IC1 is connect by resistance R1 with voltage VREF, the resistance R1 and the input
It is connected to variable resistance VR6 and capacitor C2, the variable resistance VR6 and the capacitor C2 in parallel between end 2 to be grounded, the fortune
The output end 6 for calculating amplifier IC1 is grounded by capacitor C3；
The warning circuit includes：Sequentially connected resistance R3 and warning device D1, the one end the resistance R3 and the output end 6
Connection, the other end of the resistance R3 are connect with the warning device D1 input terminal, the warning device D1 output end ground connection.
2. a kind of Mesh line according to claim 1 tests circuit, which is characterized in that the variable resistance VR1, it is described can
Power transformation hinders VR2, the variable resistance VR3, the variable resistance VR4, the variable resistance VR5 and the variable resistance VR6's
Adjustable Standard resistance range is 50K Ω~500K Ω.
3. a kind of Mesh line according to claim 1 tests circuit, which is characterized in that the warning device D1 is luminous two
Pole pipe or buzzer.
4. a kind of based on a kind of test method of Mesh line test circuit described in claim 1, which is characterized in that the test side
Method includes：
Step 1, normal four Mesh routes are respectively connected in tie point A, tie point B, tie point C and tie point D, this
When, the equivalent resistance between the tie point A and the tie point B is Rab, between the tie point A and the tie point C
Equivalent resistance is Rac, and the equivalent resistance between the tie point B and the tie point C is Rbc, the tie point B and the company
Equivalent resistance between contact D is Rbd, and the equivalent resistance between the tie point C and the tie point D is Rcd, the connection
Equivalent resistance between point A and the tie point D is variable resistance VR1, variable resistance VR2, variable resistance VR3, variable resistance
The resistance resistor bridge of VR4 and variable resistance VR5 composition；
Step 2, variable resistance VR1, variable resistance VR2, variable resistance VR3, variable resistance VR4, variable resistance VR5 and can are adjusted
Power transformation hinders VR6, it is ensured that the voltage of input terminal 2 of the voltage of the input terminal 3 of operational amplifier IC1 lower than operational amplifier IC1, fortune
The output end 6 for calculating amplifier IC1 exports low level, so that the warning device D1 connecting with operational amplifier IC1 is not responding to, completes
Mesh line tests circuit debugging；
Step 3, it by the Mesh line debugged test circuit by jig and Mesh connection to be measured, and is tested in Mesh line
Circuit is passed through voltage VREF, starts to test：
When short-circuit between any two of Mesh route to be measured or more, between the tie point A and the tie point D
Resistance bridge resistance value reduces, and the voltage of the input terminal 3 of operational amplifier IC1 increases, and is higher than the input terminal of operational amplifier IC1
The output end 6 of 2 voltage, operational amplifier IC1 exports high level, so that the warning device D1 is responded.
5. test method according to claim 4, which is characterized in that the resistance value of the variable resistance VR1 multiplied by it is described can
Power transformation hinders resistance value of the resistance value of VR4 not equal to the variable resistance VR2 multiplied by the resistance value of the variable resistance VR3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810837973.9A CN108919032A (en) | 2018-07-26 | 2018-07-26 | A kind of Mesh line test circuit and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810837973.9A CN108919032A (en) | 2018-07-26 | 2018-07-26 | A kind of Mesh line test circuit and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108919032A true CN108919032A (en) | 2018-11-30 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810837973.9A Pending CN108919032A (en) | 2018-07-26 | 2018-07-26 | A kind of Mesh line test circuit and test method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3818330A (en) * | 1972-08-17 | 1974-06-18 | Hitachi Ltd | Device having a bridge circuit for detecting faults in an electric network |
| CN2781390Y (en) * | 2005-03-14 | 2006-05-17 | 重庆汇力汽车电子仪表有限公司 | Vehicle loading short circuit, open circuit predetection circuit |
| CN102493105A (en) * | 2011-11-30 | 2012-06-13 | 北京中纺精业机电设备有限公司 | Electronic weft selector output short circuit preventing and alarming device |
| CN104396144A (en) * | 2012-07-04 | 2015-03-04 | 罗伯特·博世有限公司 | Power output stage, method for operation |
| CN104661170A (en) * | 2015-03-09 | 2015-05-27 | 山东省计算中心（国家超级计算济南中心） | Fault detection system for multiple speakers |
| CN106716077A (en) * | 2014-09-30 | 2017-05-24 | 日立汽车系统株式会社 | Thermal air flow-rate sensor |
-
2018
- 2018-07-26 CN CN201810837973.9A patent/CN108919032A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3818330A (en) * | 1972-08-17 | 1974-06-18 | Hitachi Ltd | Device having a bridge circuit for detecting faults in an electric network |
| CN2781390Y (en) * | 2005-03-14 | 2006-05-17 | 重庆汇力汽车电子仪表有限公司 | Vehicle loading short circuit, open circuit predetection circuit |
| CN102493105A (en) * | 2011-11-30 | 2012-06-13 | 北京中纺精业机电设备有限公司 | Electronic weft selector output short circuit preventing and alarming device |
| CN104396144A (en) * | 2012-07-04 | 2015-03-04 | 罗伯特·博世有限公司 | Power output stage, method for operation |
| CN106716077A (en) * | 2014-09-30 | 2017-05-24 | 日立汽车系统株式会社 | Thermal air flow-rate sensor |
| CN104661170A (en) * | 2015-03-09 | 2015-05-27 | 山东省计算中心（国家超级计算济南中心） | Fault detection system for multiple speakers |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 410205 No. 519 Tongzipo West Road, Changsha High-tech Development Zone, Hunan Province Applicant after: Changsha City Yushun Display Technology Co., Ltd. Applicant after: Shenzhen Success Electronics Ltd. Applicant after: Changsha Yushun Touch Technology Co.,Ltd. Applicant after: Shenzhen Yushun Industrial Intelligent Technology Co. Ltd. Address before: 518057 High-tech Zone, Nanshan District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Success Electronics Ltd. Applicant before: Changsha City Yushun Display Technology Co., Ltd. Applicant before: Changsha Yushun Touch Technology Co.,Ltd. Applicant before: Shenzhen Yushun Industrial Intelligent Technology Co. Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181130 |