CN104236594A - Safety edge state detection circuit - Google Patents
Safety edge state detection circuit Download PDFInfo
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- CN104236594A CN104236594A CN201410500137.3A CN201410500137A CN104236594A CN 104236594 A CN104236594 A CN 104236594A CN 201410500137 A CN201410500137 A CN 201410500137A CN 104236594 A CN104236594 A CN 104236594A
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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 specifically, relate to a kind of safe touch side state detection circuit.
Background technology
Safe touch side sensor is generally arranged on machinery and equipment edge, can export a status signal, realizing safeguard protection when being subject to human body or the extruding of other objects.Application: moving door, the edge of travelling car, package packing machine, press, press, automobile manufacturing field, iron and steel metallurgical industry, make-up machinery etc.
Due to concerning personal safety, therefore controller seems particularly important to the accuracy of sensor signal detection, rapidity, reliability.
Safe touch side sensor states signal is generally two wires and draws, the nonshared control unit that current detection scheme all uses producer to provide, when safe touch side sensor is squeezed, status contacts closes, after nonshared control unit receives this signal of sensor states, through calculating or hardware logic process, export a passive switch contact close signal; When safe touch side sensor is not squeezed, contacts status disconnects, but there is a fixed resistance value between contact, be generally 10k Ω, after nonshared control unit receives this signal of sensor states, through calculating or hardware logic process, output is a passive switch contact cut-off signal.
There is following defect in prior art: on the one hand, and use safety touches limit sensor must join a corresponding nonshared control unit again, increases equipment cost; On the other hand, be only a switch state signal owing to exporting, can only judge whether safe touch side sensor is squeezed, safe touch side sensor faults itself cannot be judged, as broken string; 3rd, the signal that master controller receives is the contact signal that nonshared control unit provides, and first increases Signal transmissions time delay; Secondly, when nonshared control unit fault, master controller accurately cannot receive the status signal of safe touch side sensor, add potential safety hazard.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of safe touch side state detection circuit, be intended to the problem of the rapidity of solution safe touch side detection, economy, security.
The invention provides a kind of safe touch side state detection circuit, comprise voltage follower U1A, the first comparer U2C, the second comparer 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, the 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 for connecting the output plus terminal of safe touch side sensor, the normal phase input end of described first comparer U2C is connected to the output negative terminal of described safe touch side sensor, the output negativing ending grounding of described safe touch side sensor by described 3rd divider resistance R7; The inverting input of described first comparer U2C is connected to the output terminal of described voltage follower U1A by described first current-limiting resistance R3, the normal phase input end of described second comparer U2D is connected to the inverting input of described voltage follower U1A and the output terminal of described voltage follower U1A by described second current-limiting resistance R4; One end of described build-out resistor R1 is connected to the link of the normal phase input end of described voltage follower U1A and the output plus terminal of described safe touch side sensor, the other end ground connection of described resistance R1; One end of described first current-limiting resistor voltage divider R2 is connected to power supply VCC, and the other end of described first current-limiting resistor voltage divider R2 is connected to the link 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 between the normal phase input end of described first comparer U2C and the inverting input of described second comparer U2D; One end of described first divider resistance R5 is connected to the inverting input of described second comparer U2D, and the other end of described first divider resistance R5 is connected to described power supply VCC.
Wherein, during work, when the normal phase input end voltage V3 of described first comparer U2C is greater than the output end voltage V1 of described voltage follower U1A, the output end voltage Vout1 of described first comparer U2C is high level; When the normal phase input end voltage V3 of described first comparer U2C is less than the output end voltage V1 of described voltage follower U1A, the output end voltage Vout1 of described first comparer U2C is low level; When the output end voltage V1 of described voltage follower U1A is greater than the anti-phase input terminal voltage V2 of described second comparer U2D, the output end voltage Vout2 of described second comparer U2D is high level; When the output end voltage V1 of described voltage follower U1A is less than the anti-phase input terminal voltage V2 of described second comparer U2D, the output end voltage Vout2 of described second comparer U2D is low level.
Wherein, when the output end voltage Vout1 of described first comparer U2C is high level and the output end voltage Vout2 of described second comparer U2D is low level, there is extruding in the described full limit sensor that touches; When the output end voltage Vout1 of described first comparer U2C is low level and the output end voltage Vout2 of described second comparer U2D is low level, the described full limit sensor that touches is not squeezed; When the output end voltage Vout1 of described first comparer U2C is low level and the output end voltage Vout2 of described second comparer U2D is high level, described safe touch side sensor self breaks.
The safe touch side testing circuit tool that the embodiment of the present invention provides has the following advantages: (1) use safety touches limit sensor no longer to be needed to join nonshared control unit, reduces equipment cost; (2) except judging whether safe touch side sensor is squeezed, self disconnection fault of safe touch side sensor can also be judged; (3) master controller directly receives the status signal of safe touch side sensor, reduces Signal transmissions time delay, can detect whether there is security incident in real time.
Accompanying drawing explanation
Fig. 1 safe touch side sensor states testing circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention, for reducing safe touch side sensor signal transmission delay, reduces Signal transmissions link, considers sensor signal to be directly sent to master controller; Adopt suitable circuit simultaneously, detect safe touch side sensor and whether there is disconnection fault.
The characteristic of the safe touch side sensor that the embodiment of the present invention provides: when there is extruding, export a closing contact signal (being 0 Ω resistance between two lines), when not being squeezed, export a fixed resistance value signal (being 10k Ω resistance between two lines), when safe touch side sensor self broken string (or internal break), export open circuit (being an infinitely-great resistance between two lines).
Embodiments provide and be a kind ofly applicable to the simple and practical testing circuit of safe touch side sensor, directly safe touch side sensor states signal is sent to master controller, and safe touch side sensor can be detected whether exist as disconnection fault.
Master controller internal security touches limit sensor states testing circuit as shown in the figure, system voltage is direct current 24V, IN1-, IN1+ are two output line link positions of safe touch side sensor states, and R1 is safe touch side sensor matching resistance, and R2 is current-limiting resistor voltage divider.Integrated operational amplifier U1A, as voltage follower, makes V1 voltage equal with Vin voltage.R3, R4 are current-limiting resistance, and R5, R6, R7 are divider resistance, and making V2 voltage be 10.4V, V3 voltage is 4.06V.U2C is operational amplifier, and as V3-V1>0, Vout1 output voltage is high level 24V, and as V3-V1<0, Vout1 output voltage is low level 0V.U2D is operational amplifier, and as V1-V2>0, Vout2 output voltage is high level 24V, and as V1-V2<0, Vout2 output voltage is low level 0V.Vout1, Vout2 can the inner main control chips of connection control device after level conversion.
When there is extruding, safe touch side sensor exports a closing contact signal (being 0 Ω resistance between two lines), then V1=Vin is 0V, V3>V1 and V1<V2, Vout1 is that high level 24V, Vout2 export as low level 0V, if represent high level with " 1 ", represent low level with " 0 ", then status signal is now " 10 "; When not being squeezed, export a fixed resistance value signal (being 10k Ω resistance between two lines), then V1=Vin is 8V, V3<V1 and V1<V2, Vout1 is that low level 0V, Vout2 export as low level 0V, if represent high level with " 1 ", represent low level with " 0 ", then status signal is now " 00 "; When safe touch side sensor self broken string (or internal break), export open circuit (being an infinitely-great resistance between two lines), then V1=Vin is 12V, V3<V1 and V1>V2, Vout1 is that low level 0V, Vout2 export as high level 24V, if represent high level with " 1 ", represent low level with " 0 ", then status signal is now " 01 ";
Signal is through the process of 7 resistance, 1 operation amplifier circuit, 2 comparator circuits, and the combination exporting two quantity of states illustrates three kinds of states of safe touch side sensor, as shown in the table.
Indicate U1A operational amplifier in figure, be not limited to use TL084, as long as operational amplifier; Indicate U2C, U2D comparer in figure, be not limited to use LM324N, as long as comparer; The 24V power supply indicated in figure, also can replace with power supplys such as 48V, 12V, 5V; When meeting input resistance value and being different, can produce different output state amount requirements, resistance value can be selected arbitrarily.
The present invention adopts this circuit structure, except judging whether safe touch side sensor is squeezed (whether there is security incident), can also judge self disconnection fault of safe touch side sensor; Adopt this circuit structure, hardware only needs increase by 7 resistance, 1 operation amplifier circuit, 2 comparator circuits, no longer needs configure dedicated controller, master controller directly receives the status signal of safe touch side sensor, reduce Signal transmissions time delay, improve equipment dependability, reduce cost.
For safe touch side sensor, mainly there are 2 kinds of states (be squeezed and be not squeezed) in it, add broken string (open circuit) state, total three state (different resistance values), 3 kinds of resistance value states use the combination of 2 quantity of states to represent by this circuit structure, are convenient to digitalization operation and the process of main control chip.
This circuit structure provides a kind of method, for the sensor having multiple state, by modelled signal treatment circuit, become the combination of multiple digital quantity state, the determination state of each combination respective sensor, controller can judge the state of sensor easily, makes respective handling.Such as, when sensor has 7 kinds of states, consider 2^3=8, by corresponding treatment circuit, these 7 kinds of states 3 quantity of states are represented, as shown in the table.
| Event | Sensor states | Treatment 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 | For subsequent use |
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a safe touch side state detection circuit, it is characterized in that, comprise voltage follower U1A, the first comparer U2C, the second comparer 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, the 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 for connecting the output plus terminal of safe touch side sensor, the normal phase input end of described first comparer U2C is connected to the output negative terminal of described safe touch side sensor, the output negativing ending grounding of described safe touch side sensor by described 3rd divider resistance R7; The inverting input of described first comparer U2C is connected to the output terminal of described voltage follower U1A by described first current-limiting resistance R3, the normal phase input end of described second comparer U2D is connected to the inverting input of described voltage follower U1A and the output terminal of described voltage follower U1A by described second current-limiting resistance R4;
One end of described build-out resistor R1 is connected to the link of the normal phase input end of described voltage follower U1A and the output plus terminal of described safe touch side sensor, the other end ground connection of described resistance R1;
One end of described first current-limiting resistor voltage divider R2 is connected to power supply VCC, and the other end of described first current-limiting resistor voltage divider R2 is connected to the link 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 between the normal phase input end of described first comparer U2C and the inverting input of described second comparer U2D;
One end of described first divider resistance R5 is connected to the inverting input of described second comparer U2D, and the other end of described first divider resistance R5 is connected to described power supply VCC.
2. safe touch side state detection circuit as claimed in claim 1, it is characterized in that, during work, when the normal phase input end voltage V3 of described first comparer U2C is greater than the output end voltage V1 of described voltage follower U1A, the output end voltage Vout1 of described first comparer U2C is high level;
When the normal phase input end voltage V3 of described first comparer U2C is less than the output end voltage V1 of described voltage follower U1A, the output end voltage Vout1 of described first comparer U2C is low level;
When the output end voltage V1 of described voltage follower U1A is greater than the anti-phase input terminal voltage V2 of described second comparer U2D, the output end voltage Vout2 of described second comparer U2D is high level;
When the output end voltage V1 of described voltage follower U1A is less than the anti-phase input terminal voltage V2 of described second comparer U2D, the output end voltage Vout2 of described second comparer U2D is low level.
3. safe touch side state detection circuit as claimed in claim 2, it is characterized in that, when the output end voltage Vout1 of described first comparer U2C is high level and the output end voltage Vout2 of described second comparer U2D is low level, there is extruding in the described full limit sensor that touches;
When the output end voltage Vout1 of described first comparer U2C is low level and the output end voltage Vout2 of described second comparer U2D is low level, the described full limit sensor that touches is not squeezed;
When the output end voltage Vout1 of described first comparer U2C is low level and the output end voltage Vout2 of described second comparer U2D is high level, described safe touch side sensor self 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 |
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| CN201410500137.3A CN104236594B (en) | 2014-09-25 | 2014-09-25 | Safety edge state detection circuit |
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| CN104236594B CN104236594B (en) | 2017-02-15 |
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| CN105182149A (en) * | 2015-07-29 | 2015-12-23 | 深圳市方大自动化系统有限公司 | Line disconnection detection circuit for anti-clamping device between subway platform door and train body |
| CN110389278A (en) * | 2019-08-01 | 2019-10-29 | 珠海市运泰利自动化设备有限公司 | A kind of B2B connector device is fitted on level detecting apparatus |
| CN113129485A (en) * | 2021-04-09 | 2021-07-16 | 国网河北省电力有限公司行唐县供电分公司 | System for distribution safety |
| CN113319872A (en) * | 2021-06-18 | 2021-08-31 | 北京京东乾石科技有限公司 | Robot control device and method |
| CN113483787A (en) * | 2021-07-19 | 2021-10-08 | 浙江国自机器人技术股份有限公司 | Controlled device and state detection circuit of safe edge-touching 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 |
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| CN113319872A (en) * | 2021-06-18 | 2021-08-31 | 北京京东乾石科技有限公司 | Robot control device and method |
| CN113483787A (en) * | 2021-07-19 | 2021-10-08 | 浙江国自机器人技术股份有限公司 | Controlled device and state detection circuit of safe edge-touching sensor thereof |
| 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 |
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