CN109900743A - A kind of circuit board soaks detection system - Google Patents
A kind of circuit board soaks detection system Download PDFInfo
- Publication number
- CN109900743A CN109900743A CN201711310579.1A CN201711310579A CN109900743A CN 109900743 A CN109900743 A CN 109900743A CN 201711310579 A CN201711310579 A CN 201711310579A CN 109900743 A CN109900743 A CN 109900743A
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- China
- Prior art keywords
- conductor surface
- circuit board
- circuit
- detection system
- soaks
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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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Abstract
A kind of circuit board soaks detection system, conductor surface is covered as sensor by the insulation being arranged in pairs in the circuit board, be conducive to exclude dampening liquid to influence caused by sensor itself or destroy, to for circuit board whether be wetted or circuit board in whether provide effective judgment basis with the presence of liquid, it is characterized in that, including the sensor being set in circuit board, the sensor includes the first conductor surface and the second opposite conductor surface with interval, first conductor surface connects sensor detection circuit, second conductor surface connects ground terminal, the outer surface of first conductor surface and the outer surface of second conductor surface all have insulating coating.
Description
Technical field
The present invention relates to circuit board detecting technology, especially a kind of circuit board soaks detection system, by the circuit board
The insulation covering conductor surface being arranged in pairs as sensor, be conducive to exclude dampening liquid on being influenced caused by sensor itself or
Destroy, thus for circuit board whether be wetted or circuit board in whether provide effective judgment basis with the presence of liquid.
Background technique
The case where electronic product, which is intake, generally results in the damage of electronic product, and circuit board therein (PCB) is wetted
It is assured that not by observation, it is therefore desirable to configure detection circuit thus.Traditional detection mode is direct contact type inspection
It surveys, i.e., detection sensor directly contacts fluid to be measured, then will test result and export out.The inventors discovered that existing circuit
Plate soaks detection and has the following defects or insufficient, for example, the area of detection of sensor required for detecting is big, biggish area
It is required that will be unable to be applied in the middle of the detection of small space, meanwhile, area of detection senior general occupies biggish PCB surface product, will make
At the waste of PCB space.In addition, needing sensor conductive face directly to contact with liquid when detection liquid, liquid will be caused in this way
Electric current is had when detected to flow through, and will cause different degrees of corrosion using sensor and liquid contact surface for a long time,
Testing result and service life will be will affect.In addition, the prior art cannot achieve multiple spot detection function simultaneously, it is unable to satisfy entirety
The requirement of system detection, it is difficult to construct complicated detection system.Inventors believe that if being examined using noncontacting proximity sensor part
Survey liquid, that is to say, that induction component and soak or liquid be in isolation, be arranged in pairs in the circuit board for example, passing through
Insulation covering conductor surface can then exclude dampening liquid to influence caused by sensor itself or destroy as sensor, thus
Ensure the reliability of testing result and soaks the service life of detection system.In view of this, the present inventor's design completes this hair
It is bright.
Summary of the invention
The present invention is in view of the deficiencies in the prior art or insufficient, provides a kind of circuit board and soaks detection system, passes through
The insulation covering conductor surface being arranged in pairs in the circuit board is conducive to exclusion dampening liquid and makes to sensor itself as sensor
At influence or destruction, thus for circuit board whether be wetted or circuit board in whether with the presence of liquid provide effectively judge according to
According to.
Technical solution of the present invention is as follows:
A kind of circuit board soaks detection system, which is characterized in that including the sensor being set in circuit board, the sensing
Device includes the first conductor surface and the second opposite conductor surface with interval, and first conductor surface connects sensor detection circuit,
The outer surface of the second conductor surface connection ground terminal, the outer surface of first conductor surface and second conductor surface all has
Insulating coating.
The insulating coating is waterproof insulation clad.
The thickness of the thickness of first conductor surface and second conductor surface is 35um ± 10%, and the thickness does not wrap
Include insulating coating.
First conductor surface and second conductor surface are all made of tooth-shape structure, first conductor surface and described second
It is the gap of serpentine wire shaped between conductor surface.
The sensor detection circuit includes electric current output driving circuit and transducing signal receives circuit, the electric current output
Driving circuit and transducing signal receive circuit and are all connected with first conductor surface.
The electric current output driving circuit includes current source, and the output end of the current source is connected by Current-source matching resistance
First conductor surface is connect, it includes first comparator and the second comparator that the transducing signal, which receives circuit, and described first compares
The positive input terminal of device negative input end and second comparator is all connected with first conductor surface, the output of the first comparator
The first input end of end connection AND gate circuit, the output end of second comparator connect the second input of the AND gate circuit
End, the output end of the AND gate circuit connect the electric current output feedback ontrol end of the current source.
The first comparator positive input terminal connects high threshold voltage end, and the negative input end connection of second comparator is low
The output end at threshold voltage end, the AND gate circuit connects voltage value high-low threshold transformation period counting circuit end.
The voltage value high-low threshold transformation period counting circuit records the voltage change time between high-low threshold
Come.
The voltage change time record includes that liquid is not present between first conductor surface and second conductor surface
When, electricity that the current source converts between first conductor surface and from second conductor surface to the sensor Injection Current
Pressure value the first high-low threshold transformation period, and there are liquid when being accused of between first conductor surface and second conductor surface
When, the second high-low threshold transformation period is recorded, when the second high-low threshold transformation period and first high-low threshold change
Between between difference be judge be detected liquid existing for foundation.
First conductor surface and second conductor surface are all satisfied the mode for applying copper using PCB completely, manufacture and flow in PCB
Other wirings of Cheng Shangyu PCB are completed together.
The technology of the present invention effect is as follows: a kind of circuit board of the invention soaks detection system, can make detection device and biography
Sensor is in narrow space, and detection sensor will not directly contact detected liquid, is conducive to exclude dampening liquid to biography
Influence caused by sensor itself destroys.The present invention can be realized multiple spot while detect, and sensor can separately exist in
Different spatial is conducive to the complicated detection system of building.Detection sensor can provide in detection zone with the presence or absence of liquid
The detection characteristic information of body.Detection sensor conductor surface can satisfy completely using PCB apply copper mode, on manufacturing process with
Other wirings of PCB are completed together, so monolayer wiring method can be used in detection sensor, or in top layer, or in bottom.
Detailed description of the invention
Fig. 1 is the structural schematic diagram implemented a kind of circuit board of the present invention and soak detection system.
Appended drawing reference lists as follows: 1- sensor detection circuit；2- electric current output driving circuit；The first conductor surface of 3-；4-
Sensor or conductor surface sensor；The second conductor surface of 5-；6- ground terminal；7- first comparator；8- first input end；9- and door electricity
Road；The second comparator of 10-；The second input terminal of 11-；12- transducing signal receives circuit；13- electric current output feedback ontrol circuit；
14- current source；15- electric current output feedback ontrol end；16- current source output；17- voltage value high-low threshold transformation period calculates
Circuit end.
IOUTCurrent source exports electric current or current source output current value；RLResistance；Vhref- high threshold voltage or high threshold
Voltage value or high threshold voltage end；Vlref- low threshold voltage or low threshold voltage value or low threshold voltage end.
Specific embodiment
With reference to the accompanying drawing (Fig. 1) the present invention will be described.
Fig. 1 is the structural schematic diagram implemented a kind of circuit board of the present invention and soak detection system.As shown in Figure 1, a kind of circuit
Plate soaks detection system, including the sensor 4 being set in circuit board, the sensor 4 include the first conductor surface 3 and with therebetween
Every the second opposite conductor surface 5, first conductor surface 3 connects sensor detection circuit 1, and second conductor surface 5 connects
The outer surface of ground terminal 6, the outer surface of first conductor surface 3 and second conductor surface 5 all has insulating coating.It is described exhausted
Edge clad is waterproof insulation clad.The thickness of the thickness of first conductor surface 3 and second conductor surface 5 is 35um
± 10%, the thickness does not include insulating coating.First conductor surface 3 and second conductor surface 5 are all made of tooth form knot
Structure is the gap of serpentine wire shaped between first conductor surface 3 and second conductor surface 5.
The sensor detection circuit 1 includes that electric current output driving circuit 2 and transducing signal receive circuit 12, the electric current
Output driving circuit 2 and transducing signal receive circuit 12 and are all connected with first conductor surface.The electric current output driving circuit 2 wraps
Current source 14 is included, the current source output 16 of the current source 14 passes through Current-source matching resistance RLConnect first conductor surface
3, it includes first comparator 7 and the second comparator 10,7 negative input end of first comparator that the transducing signal, which receives circuit 12,
The positive input terminal (+) of (-) and second comparator 10 is all connected with first conductor surface 3, the output of the first comparator 7
The first input end 8 of end connection AND gate circuit 9, the output end of second comparator 10 connect the second of the AND gate circuit 9
Input terminal 11, the electric current output feedback ontrol end 15 that the output end of the AND gate circuit 9 connects the current source 14 are (i.e. electric with door
Electric current output feedback ontrol circuit 13 is formed between road 9 and current source 14).7 positive input terminal of first comparator (+) connection is high
Threshold voltage end Vhref, negative input end (-) connection low threshold voltage end Vlref of second comparator 10, it is described electric with door
The output end on road 9 connects voltage value high-low threshold transformation period counting circuit end 17.The voltage value high-low threshold transformation period
Counting circuit records the voltage change time between high-low threshold.The voltage change time record includes described first
When liquid being not present between conductor surface 3 and second conductor surface 5, the current source 14 is to the sensor Injection Current in institute
Voltage value the first high-low threshold transformation period converted between the first conductor surface 3 and second conductor surface 5 is stated, and when described
It is accused of between first conductor surface 3 and second conductor surface 5 there are when liquid, the second high-low threshold transformation period of record is described
Difference between second high-low threshold transformation period and the first high-low threshold transformation period is to judge that being detected liquid exists
Foundation.First conductor surface 3 and second conductor surface 5 are all satisfied the mode for applying copper using PCB completely, manufacture in PCB
Other wirings are completed together with PCB in process.
It is examined regardless of positive and negative and direction, the direction in sensor conductor face by the sensor for being connected to it in sensor conductor face itself
Slowdown monitoring circuit determines.Sensor detection circuit is using a conductor surface in sensor conductor face as test side, another conductor surface
As circuit end.Sensor two conductor surfaces be isolated with liquid using PCB solder mask.
It is hereby stated that described above facilitate those skilled in the art understand that the invention, but not limit the present invention
The protection scope of creation.Any equivalent replacement described above, modification are improved without disengaging the invention substantive content
And/or delete numerous conform to the principle of simplicity and the implementation that carries out, each fall within the protection scope of the invention.
Claims (10)
1. a kind of circuit board soaks detection system, which is characterized in that including the sensor being set in circuit board, the sensor
Including the first conductor surface and the second opposite conductor surface with interval, first conductor surface connects sensor detection circuit, institute
The second conductor surface connection ground terminal is stated, the outer surface of the outer surface of first conductor surface and second conductor surface all has absolutely
Edge clad.
2. circuit board according to claim 1 soaks detection system, which is characterized in that the insulating coating is that waterproof is exhausted
Edge clad.
3. circuit board according to claim 1 soaks detection system, which is characterized in that the thickness of first conductor surface and
The thickness of second conductor surface is 35um ± 10%, and the thickness does not include insulating coating.
4. circuit board according to claim 1 soaks detection system, which is characterized in that first conductor surface and described
Two conductor surfaces are all made of tooth-shape structure, are the gap of serpentine wire shaped between first conductor surface and second conductor surface.
5. circuit board according to claim 1 soaks detection system, which is characterized in that the sensor detection circuit includes
Electric current output driving circuit and transducing signal receive circuit, and the electric current output driving circuit and transducing signal receive circuit and connect
Connect first conductor surface.
6. circuit board according to claim 5 soaks detection system, which is characterized in that the electric current output driving circuit packet
Current source is included, the output end of the current source connects first conductor surface, the transducing signal by Current-source matching resistance
Receiving circuit includes first comparator and the second comparator, and the first comparator negative input end and second comparator are just
Input terminal is all connected with first conductor surface, the first input end of the output end connection AND gate circuit of the first comparator, institute
The output end for stating the second comparator connects the second input terminal of the AND gate circuit, described in the output end connection of the AND gate circuit
The electric current output feedback ontrol end of current source.
7. circuit board according to claim 6 soaks detection system, which is characterized in that the first comparator positive input terminal
High threshold voltage end is connected, the negative input end of second comparator connects low threshold voltage end, the output of the AND gate circuit
End connection voltage value high-low threshold transformation period counting circuit end.
8. circuit board according to claim 7 soaks detection system, which is characterized in that the voltage value high-low threshold variation
Time calculation circuit records the voltage change time between high-low threshold.
9. circuit board according to claim 8 soaks detection system, which is characterized in that the voltage change time record packet
It includes there is no when liquid between first conductor surface and second conductor surface, the current source injects electricity to the sensor
Voltage value the first high-low threshold transformation period converted between first conductor surface and second conductor surface is flowed, and is worked as
It is accused of recording the second high-low threshold transformation period, institute there are when liquid between first conductor surface and second conductor surface
The difference between the second high-low threshold transformation period and the first high-low threshold transformation period is stated to judge to be detected liquid and depositing
Foundation.
10. circuit board according to claim 1 soaks detection system, which is characterized in that first conductor surface and described
Second conductor surface is all satisfied the mode for applying copper using PCB completely, other wirings are completed together with PCB on PCB manufacturing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310579.1A CN109900743A (en) | 2017-12-11 | 2017-12-11 | A kind of circuit board soaks detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310579.1A CN109900743A (en) | 2017-12-11 | 2017-12-11 | A kind of circuit board soaks detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109900743A true CN109900743A (en) | 2019-06-18 |
Family
ID=66942680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711310579.1A Pending CN109900743A (en) | 2017-12-11 | 2017-12-11 | A kind of circuit board soaks detection system |
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| Country | Link |
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| CN (1) | CN109900743A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873927A (en) * | 1973-11-05 | 1975-03-25 | Surface Systems | System for detecting wet and icy surface conditions |
| JPS5513885A (en) * | 1978-07-17 | 1980-01-31 | Matsushita Electric Ind Co Ltd | Humidity detection circuit |
| US4522060A (en) * | 1982-03-24 | 1985-06-11 | Murata Manufacturing Co., Ltd. | Dry/dew/frost sensor |
| CN104374421A (en) * | 2013-08-16 | 2015-02-25 | 深圳市深安旭传感技术有限公司 | Transducer for measuring tiny water in oil and method for on-line real-time monitoring of temperature and humidity in oil |
| CN105301659A (en) * | 2014-05-29 | 2016-02-03 | 苹果公司 | Moisture ingress sensors |
| CN205749380U (en) * | 2016-05-20 | 2016-11-30 | 南京信息工程大学 | The water content measuring probe of Based PC B and marginal effect of electric field |
-
2017
- 2017-12-11 CN CN201711310579.1A patent/CN109900743A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873927A (en) * | 1973-11-05 | 1975-03-25 | Surface Systems | System for detecting wet and icy surface conditions |
| JPS5513885A (en) * | 1978-07-17 | 1980-01-31 | Matsushita Electric Ind Co Ltd | Humidity detection circuit |
| US4522060A (en) * | 1982-03-24 | 1985-06-11 | Murata Manufacturing Co., Ltd. | Dry/dew/frost sensor |
| CN104374421A (en) * | 2013-08-16 | 2015-02-25 | 深圳市深安旭传感技术有限公司 | Transducer for measuring tiny water in oil and method for on-line real-time monitoring of temperature and humidity in oil |
| CN105301659A (en) * | 2014-05-29 | 2016-02-03 | 苹果公司 | Moisture ingress sensors |
| CN205749380U (en) * | 2016-05-20 | 2016-11-30 | 南京信息工程大学 | The water content measuring probe of Based PC B and marginal effect of electric field |
Non-Patent Citations (1)
| Title |
|---|
| 元增民: "《电工技术 电工学》", 31 August 2011, 国防科技大学出版社 * |
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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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190618 |
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| RJ01 | Rejection of invention patent application after publication |