CN104236594B - Safety edge state detection circuit - Google Patents
Safety edge state detection circuit Download PDFInfo
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- CN104236594B CN104236594B CN201410500137.3A CN201410500137A CN104236594B CN 104236594 B CN104236594 B CN 104236594B CN 201410500137 A CN201410500137 A CN 201410500137A CN 104236594 B CN104236594 B CN 104236594B
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Abstract
The invention discloses a safety edge state detection circuit which comprises a voltage follower, a first comparator, a second comparator, a matching resistor, a first voltage-dividing and current-limiting resistor, a first current-limiting resistor, a second current-limiting resistor, a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor. The non-inverting input end of the voltage follower is used for being connected with the output positive end of a safety edge sensor, the non-inverting input end of the first comparator is connected to the output negative end of the safety edge sensor through the third voltage-dividing resistor, the inverting input end of the first comparator is connected to the output end of the voltage follower through the first current-limiting resistor, and the non-inverting input end of the second comparator is connected to the inverting input end of the voltage follower and the output end of the voltage follower through the second current-limiting resistor. The safety edge sensor is used while a special controller is no longer necessary, so that equipment cost is lowered; whether the safety edge sensor is squeezed or not can be judged, and self break line fault of the safety edge sensor can be judged; a main controller receives status signals of the safety edge sensor directly, signal transmission delay is reduced, and whether security incidents happen or not can be detected in real time.
Description
Technical field
The invention belongs to safe touch side detection technique field, more particularly, to a kind of safe touch side state detection circuit.
Background technology
Safe touch side sensor is typically mounted at machinery equipment edge, can export when by human body or the extruding of other objects
One status signal, realizes safeguard protection.Application：Mobile door, the edge of moving cart, package packing machine, press, pressure
Power machinery, automobile manufacturing field, iron and steel metallurgical industry, make-up machinery etc..
Due to concerning personal safety, therefore controller seems to the accuracy of sensor signal detection, rapidity, reliability
Particularly important.
Generally two wires of safe touch side sensor states signal are drawn, and current detection scheme is all provided using producer
Nonshared control unit, when safe touch side sensor is squeezed, status contacts close, and nonshared control unit receives sensor states
After this signal, process through calculating or hardware logic, export a passive switch contact close signal；When safe touch side sensing
When device is not affected by extruding, contacts status disconnect, but there is a fixed resistance value, generally 10k Ω, nonshared control unit between contact
After receiving this signal of sensor states, process through calculating or hardware logic, be output as a passive switch contact and disconnect letter
Number.
There is following defect in prior art：On the one hand, using safe touch side sensor must join again one corresponding special
Controller, increases equipment cost；On the other hand, because output is only a switch state signal, can only judge that safe touch side passes
Whether sensor is squeezed it is impossible to judge safe touch side sensor faults itself, such as breaks；3rd, the letter that master controller receives
Number it is the contact signal that nonshared control unit provides, increase signal transmission time delay first；Secondly, when nonshared control unit fault, main
Controller will be unable to accurately receive the status signal of safe touch side sensor, increased potential safety hazard.
Content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of safe touch side state detection circuit it is intended to
Solve the problems, such as safe touch side detection rapidity, economy, safety.
The invention provides a kind of safe touch side state detection circuit, including voltage follower U1A, first comparator U2C,
Second comparator U2D, build-out resistor R1, the first current-limiting resistor voltage divider R2, the first current-limiting resistance R3, the second current-limiting resistance R4,
One divider resistance R5, the second divider resistance R6 and the 3rd divider resistance R7；The normal phase input end of described voltage follower U1A is used for
Attachment security touches the output plus terminal of side sensor, and the normal phase input end of described first comparator U2C is by described 3rd partial pressure electricity
Resistance R7 connects to the output negative terminal of described safe touch side sensor, the output negativing ending grounding of described safe touch side sensor；Described
The inverting input of first comparator U2C is connected to the output of described voltage follower U1A by described first current-limiting resistance R3
End, the normal phase input end of described second comparator U2D is connected to described voltage follower U1A by described second current-limiting resistance R4
Inverting input and described voltage follower U1A outfan；One end of described build-out resistor R1 be connected to described voltage with
With the connection end of the output plus terminal of normal phase input end and the described safe touch side sensor of device U1A, the other end of described resistance R1
Ground connection；One end of described first current-limiting resistor voltage divider R2 connects to power supply VCC, the other end of described first current-limiting resistor voltage divider R2
It is connected to the connection end of the normal phase input end of described voltage follower U1A and the output plus terminal of described safe touch side sensor；Institute
State the second divider resistance R6 and be connected to the normal phase input end of described first comparator U2C and the anti-phase of described second comparator U2D
Between input；One end of described first divider resistance R5 connects to the inverting input of described second comparator U2D, and described
The other end of one divider resistance R5 connects to described power supply VCC.
Wherein, during work, when the normal phase input end voltage V3 of described first comparator U2C is more than described voltage follower
During the output end voltage V1 of U1A, the output end voltage Vout1 of described first comparator U2C is high level；When described first compares
When the normal phase input end voltage V3 of device U2C is less than the output end voltage V1 of described voltage follower U1A, described first comparator
The output end voltage Vout1 of U2C is low level；When the output end voltage V1 of described voltage follower U1A is more than described second ratio
During relatively anti-phase input terminal voltage V2 of device U2D, the output end voltage Vout2 of described second comparator U2D is high level；When described
When the output end voltage V1 of voltage follower U1A is less than anti-phase input terminal voltage V2 of described second comparator U2D, described second
The output end voltage Vout2 of comparator U2D is low level.
Wherein, when the output end voltage Vout1 of described first comparator U2C is high level and described second comparator U2D
Output end voltage Vout2 when being low level, there is extruding in the described side sensor of entirely touching；Defeated when described first comparator U2C
When to go out the output end voltage Vout2 that terminal voltage Vout1 is low level and described second comparator U2D be low level, described entirely touch
Side sensor is not affected by extruding；When the output end voltage Vout1 of described first comparator U2C compares for low level and described second
When the output end voltage Vout2 of device U2D is high level, described safe touch side sensor itself breaks.
Safe touch side testing circuit provided in an embodiment of the present invention has the advantage that：(1) use safe touch side sensor
It is no longer necessary to join nonshared control unit, reduce equipment cost；(2) remove and may determine that whether safe touch side sensor is squeezed, also
May determine that itself disconnection fault of safe touch side sensor；(3) master controller directly receives the state letter of safe touch side sensor
Number, reduce signal transmission time delay, real-time detection can whether there is security incident.
Brief description
Fig. 1 safe touch side sensor states testing circuit.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The present invention is to reduce safe touch side sensor signal transmission delay, reduces signal transmission link it is considered to by sensor
Signal is routed directly to master controller；Adopt suitable circuit, detection safe touch side sensor whether there is disconnection fault simultaneously.
The characteristic of safe touch side sensor provided in an embodiment of the present invention：When there is extruding, one closure contact letter of output
Number (between both threads be 0 Ω resistance), when being not affected by extruding, one fixed resistance value signal of output (is 10k between both threads
Ω resistance), when safe touch side sensor itself broken string (or internal break), output open circuit (is a nothing between both threads
Big resistance thoroughly).
Embodiments provide a kind of be applied to the simple and practical testing circuit of safe touch side sensor, directly will pacify
Entirely touch side sensor states signal and be sent to master controller it is possible to detection safe touch side sensor whether there is such as disconnection fault.
Master controller internal security touches side sensor states testing circuit as illustrated, system voltage is direct current 24V,
IN1-, IN1+ are two output lead link positions of safe touch side sensor states, and R1 is safe touch side sensor matching resistance,
R2 is current-limiting resistor voltage divider.Integrated operational amplifier U1A, as voltage follower, makes V1 voltage equal with Vin voltage.R3、R4
For current-limiting resistance, R5, R6, R7 are divider resistance, make V2 voltage be 10.4V, V3 voltage is 4.06V.U2C is operational amplifier,
Work as V3-V1>When 0, Vout1 output voltage is high level 24V, works as V3-V1<When 0, Vout1 output voltage is low level 0V.U2D
For operational amplifier, work as V1-V2>When 0, Vout2 output voltage is high level 24V, works as V1-V2<When 0, Vout2 output voltage is
Low level 0V.Vout1, Vout2 can connect the internal main control chip of controller after level conversion.
When there is extruding, safe touch side sensor exports a closure contact signal (being 0 Ω resistance between both threads),
Then V1=Vin is 0V, V3>V1 and V1<V2, Vout1 are high level 24V, and Vout2 is output as low level 0V, if represented with " 1 "
High level, represents low level with " 0 ", then status signal now is " 10 "；When being not affected by extruding, export a fixed resistance
Value signal (being 10k Ω resistance between both threads), then V1=Vin is 8V, V3<V1 and V1<V2, Vout1 are low level 0V,
Vout2 is output as low level 0V, if representing high level with " 1 ", represents low level with " 0 ", then status signal now is
“00”；When safe touch side sensor itself broken string (or internal break), output open circuit (is an infinity between both threads
Resistance), then V1=Vin be 12V, V3<V1 and V1>V2, Vout1 are low level 0V, and Vout2 is output as high level 24V, if
Represent high level with " 1 ", represent low level with " 0 ", then status signal now is " 01 "；
Signal through 7 resistance, 1 operation amplifier circuit, 2 comparator circuits process, export two quantity of states
Combination illustrate three kinds of states of safe touch side sensor, as shown in the table.
In figure indicates U1A operational amplifier, is not limited to use TL084, as long as operational amplifier；In figure mark
Show U2C, U2D comparator, be not limited to use LM324N, as long as comparator；The 24V power supply that in figure indicates, also may be used
To be replaced with power supplys such as 48V, 12V, 5V；When meeting input resistance value difference, different output state amounts can be produced and require, electricity
Resistance can arbitrarily select.
The present invention adopts this circuit structure, except may determine that whether safe touch side sensor is squeezed (with the presence or absence of peace
Total event), itself disconnection fault of safe touch side sensor can also be judged；Using this circuit structure, hardware only needs to increase by 7 electricity
, it is no longer necessary to configure nonshared control unit, master controller directly receives peace for resistance, 1 operation amplifier circuit, 2 comparator circuits
Entirely touch the status signal of side sensor, reduce signal transmission time delay, improve equipment dependability, reduce cost.
For safe touch side sensor, it is primarily present 2 kinds of states (being squeezed and not compact), adds broken string (breaking)
State, total three state (different resistance values), 3 kinds of resistance value states are carried out by this circuit structure using the combination of 2 quantity of states
Represent, be easy to digitalization operation and the process of main control chip.
This circuit structure provides a method that, for the sensor having multiple states, by modelled signal process circuit,
It is changed into the combination of multiple digital quantity states, the determination state of each combination respective sensor, controller can be convenient
Judge the state of sensor, make respective handling.For example, when sensor has 7 kinds of states it is contemplated that 2^3=8, by phase
The process circuit answered, this 7 kinds of states are indicated with 3 quantity of states, as shown in the table.
| Event | Sensor states | Process circuit output state | Remarks |
| Event 1 | State 1 | 000 | |
| Event 2 | State 2 | 001 | |
| Event 3 | State 3 | 010 | |
| Event 4 | State 4 | 011 | |
| Event 5 | State 5 | 100 | |
| Event 6 | State 6 | 101 | |
| Event 7 | State 7 | 110 | |
| / | / | 111 | Standby |
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not in order to
Limit the present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should comprise
Within protection scope of the present invention.
Claims (1)
1. a kind of safe touch side state detection circuit it is characterised in that include voltage follower U1A, first comparator U2C, the
Two comparator U2D, build-out resistor R1, the first current-limiting resistor voltage divider R2, the first current-limiting resistance R3, the second current-limiting resistance R4, first
Divider resistance R5, the second divider resistance R6 and the 3rd divider resistance R7；
The normal phase input end of described voltage follower U1A is used for the output plus terminal that attachment security touches side sensor, described first ratio
Normal phase input end compared with device U2C is connected to the output negative terminal of described safe touch side sensor by described 3rd divider resistance R7,
The output negativing ending grounding of described safe touch side sensor；The inverting input of described first comparator U2C limits by described first
Leakage resistance R3 connects to the outfan of described voltage follower U1A, and the normal phase input end of described second comparator U2D is by described
Second current-limiting resistance R4 connects the outfan of inverting input to described voltage follower U1A and described voltage follower U1A；
One end of described build-out resistor R1 is connected to the normal phase input end of described voltage follower U1A and described safe touch side sensing
The connection end of the output plus terminal of device, the other end ground connection of described resistance R1；
One end of described first current-limiting resistor voltage divider R2 connects to power supply VCC, the other end of described first current-limiting resistor voltage divider R2
It is connected to the connection end of the normal phase input end of described voltage follower U1A and the output plus terminal of described safe touch side sensor；
Described second divider resistance R6 is connected to the normal phase input end of described first comparator U2C and described second comparator U2D
Inverting input between；
One end of described first divider resistance R5 connects to the inverting input of described second comparator U2D, described first partial pressure
The other end of resistance R5 connects to described power supply VCC；
During work, when the normal phase input end voltage V3 of described first comparator U2C is more than the outfan of described voltage follower U1A
During voltage V1, the output end voltage Vout1 of described first comparator U2C is high level；
When the normal phase input end voltage V3 of described first comparator U2C is less than the output end voltage V1 of described voltage follower U1A
When, the output end voltage Vout1 of described first comparator U2C is low level；
When the output end voltage V1 of described voltage follower U1A is more than anti-phase input terminal voltage V2 of described second comparator U2D
When, the output end voltage Vout2 of described second comparator U2D is high level；
When the output end voltage V1 of described voltage follower U1A is less than anti-phase input terminal voltage V2 of described second comparator U2D
When, the output end voltage Vout2 of described second comparator U2D is low level；Output end voltage when described first comparator U2C
When the output end voltage Vout2 for high level and described second comparator U2D for the Vout1 is low level, described safe touch side sensing
There is extruding in device；
The outfan electricity being low level and described second comparator U2D as the output end voltage Vout1 of described first comparator U2C
When pressure Vout2 is low level, described safe touch side sensor is not affected by extruding；
The outfan electricity being low level and described second comparator U2D as the output end voltage Vout1 of described first comparator U2C
When pressure Vout2 is high level, described safe touch side sensor itself breaks.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410500137.3A CN104236594B (en) | 2014-09-25 | 2014-09-25 | Safety edge state detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410500137.3A CN104236594B (en) | 2014-09-25 | 2014-09-25 | Safety edge state detection circuit |
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| CN104236594A CN104236594A (en) | 2014-12-24 |
| CN104236594B true CN104236594B (en) | 2017-02-15 |
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| CN105182149B (en) * | 2015-07-29 | 2018-01-23 | 深圳市方大自动化系统有限公司 | Anti-pinch device break detection circuit between a kind of subway platform door and train body |
| CN110389278B (en) * | 2019-08-01 | 2024-06-14 | 珠海市运泰利自动化设备有限公司 | B2B connector assembly detection device that targets in place |
| CN113129485B (en) * | 2021-04-09 | 2022-09-27 | 国网河北省电力有限公司行唐县供电分公司 | System for distribution safety |
| CN113319872B (en) * | 2021-06-18 | 2022-12-02 | 北京京东乾石科技有限公司 | Robot control device and method |
| CN113483787B (en) * | 2021-07-19 | 2024-03-01 | 浙江国自机器人技术股份有限公司 | Controlled device and state detection circuit of safe touch edge sensor thereof |
| CN113848948A (en) * | 2021-10-20 | 2021-12-28 | 北京京东乾石科技有限公司 | Detection circuit and robot control circuit |
| CN115765078A (en) * | 2022-11-10 | 2023-03-07 | 福氏新能源技术(上海)有限公司 | Driver's built-in charger balance protection circuit and its balance protection control method |
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| JP4287070B2 (en) * | 2001-04-02 | 2009-07-01 | 矢崎総業株式会社 | Power window prevention device |
| CN101520468B (en) * | 2009-04-09 | 2011-04-20 | 中国兵器工业集团第七0研究所 | Magnetoelectric sensor adjusting circuit |
| CN102879611B (en) * | 2012-10-22 | 2013-11-13 | 瓮福（集团）有限责任公司 | Circuit for detecting breakage or short circuiting of speed sensor circuit |
| CN102937669B (en) * | 2012-11-06 | 2017-09-22 | 宁波敏实汽车零部件技术研发有限公司 | A kind of automobile electric sliding door anti-biting bar detects circuit |
| CN203462905U (en) * | 2013-08-28 | 2014-03-05 | 重庆海德世拉索系统（集团）有限公司 | Automatic back door control system for automobile |
| CN204128571U (en) * | 2014-09-25 | 2015-01-28 | 武汉华海通用电气有限公司 | A kind of safe touch side state detection circuit |
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