CN106093774A - A kind of switch detection circuit - Google Patents
A kind of switch detection circuit Download PDFInfo
- Publication number
- CN106093774A CN106093774A CN201610773817.1A CN201610773817A CN106093774A CN 106093774 A CN106093774 A CN 106093774A CN 201610773817 A CN201610773817 A CN 201610773817A CN 106093774 A CN106093774 A CN 106093774A
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- CN
- China
- Prior art keywords
- operational amplifier
- circuit
- switch
- connects
- outfan
- Prior art date
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Keying Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of switch detection circuit, switch to be detected accesses operational amplification circuit after connecting reduction voltage circuit, the inverting input of concatenation operation amplifier A, the normal phase input end of operational amplifier B and the inverting input of operational amplifier C respectively, the outfan of operational amplifier A and operational amplifier B connects two inputs of AND circuit, and the outfan of AND circuit connects connects signal generator；The outfan of operational amplifier C connects cut-off signal generator.By this testing circuit, can detect whether the connection resistance of switch and open circuit resistance are in a default scope, improve the accuracy of detection.
Description
Technical field
The present invention relates to the testing circuit of a kind of switch.
Background technology
Past, K was product switch, and R is current-limiting resistance, then connects to the detection method of switch contact break-make as shown in figure
Display lamp, more in addition suitably DC voltage in whole loop, when K connects, display lamp is lighted, on the contrary extinguishing, by lamp
Light on and off judge the quality of switch contact K.Detection mode in figure one has a lot of drawback, and shortcoming is that the on off operating mode of K does not has
Obtaining program monitoring, the contact resistance of K is not under control.The quality of switch can only use eye-observation, alarm free device, easily
Carelessness, such as when switch contact normal open or normally closed in the case of, although artificially in operating switch but true contact not operating, this
The switch fault of sample is easily neglected；The contact resistance when connecting of normal switch contact, close to zero Europe, should be infinite during disconnection
Greatly, but to defective switch it is possible that switch this most really occur that contact resistance has in tens Europe to the most thousand of
Between Europe, such state can cause the same connection signal that can receive switch of terminal unit or display fault, but to this
Plant detection method None-identified in fault graph one；Defective switch may reach more than hundreds of Europe, so by contact resistance when connecting
And the also None-identified of the detection mode in figure one, the underproof situation of contact resistance cannot be discovered by artificial observation.
Summary of the invention
The technical problem to be solved in the present invention: the problems referred to above existed for the detection of existing switch contact break-make, it is provided that
A kind of new switch contact break-make testing circuit.
Technical solution of the present invention:
A kind of switch detection circuit, by accessing operational amplification circuit after switch to be detected and earth resistance parallel connection, connects fortune respectively
Calculating the inverting input of amplifier A, the normal phase input end of operational amplifier B and the inverting input of operational amplifier C, computing is put
The outfan of big device A and operational amplifier B connects two inputs of AND circuit, and the outfan of AND circuit connects connects letter
Number generator；The outfan of operational amplifier C connects cut-off signal generator.
The outfan of AND circuit connects one and connects display lamp.
The input of each operational amplifier is all in series with protective resistance.
The forward phase input input voltage V2 of operational amplifier A, the inverting input input voltage of operational amplifier B
The normal phase input end input voltage V4 of V3, operational amplifier C, switchs front end input voltage V1, wherein V2 ＞ V1 ＞ V3 ＞ V4.
Beneficial effects of the present invention:
By this testing circuit, can detect whether the connection resistance of switch and open circuit resistance are a default scope
In, improve the accuracy of detection.
Accompanying drawing illustrates:
Fig. 1 is existing testing circuit.
Fig. 2 is the testing circuit of the present invention.
Detailed description of the invention:
Embodiment: such as figure, switch to be detected and earth resistance R1 are connected and forms reduction voltage circuit, then by both lines
Point A point access operational amplification circuit, A point distinguish the inverting input of concatenation operation amplifier A, operational amplifier B positive defeated
Entering the inverting input of end and operational amplifier C, the outfan of operational amplifier A and operational amplifier B connects AND circuit
Two inputs, the outfan of AND circuit connects to be connected signal generator and connects display lamp, connects signal generator output
Connect signal X1；The outfan of operational amplifier C connects cut-off signal generator, cut-off signal generator output cut-off signal
X2.The input of each operational amplifier is all in series with protective resistance.The forward phase input input voltage of operational amplifier A
V2, the normal phase input end input voltage V4 of inverting input input voltage V3, operational amplifier C of operational amplifier B, before switch
End input voltage V1, wherein V2 ＞ V1 ＞ V3 ＞ V4.
Its feature of testing circuit after improvement is that the on off operating mode of K obtains program and monitors in real time, and the contact resistance of K is permissible
Obtain control of keeping under strict control as required.X1, X2 in figure two is that in figure, every path switching signal K is processed as connecting by hardware elementary diagram
Signal X1 and cut-off signal X2, when K connects, X1 has connection signal to be input to Programmable Logic Controller, and when K disconnects, X2 has messenger
Input Programmable Logic Controller, by the break-make of programmable device pilot switch, it is ensured that the state of switch.Avoid artificial observation to bring not
Certainty factor, switch K theoretical contact resistance when disconnecting is infinitely great, is 0 Europe during connection, but true switch contact is to deposit
At contact resistance, it is the most qualified that contact resistance must control in prescribed limit, and in figure, the size of R1 just can regulate the contact electricity of K
The resistance upper limit, having connected X1 more than higher limit K also will not output signal.K either disconnect also be to turn on its in fact between contact all
There is resistance, such A point just has a voltage, upper figure principle when learning that K disconnects, A point voltage have to be lower than+V4, no
Then without X2 signal, when K connects, A point voltage must be between+V2 to+V3, otherwise without X1 signal.By figure two to switch contact
Control after not only reliably controlled switching on-off, switch contact resistance under each state is obtained strictly simultaneously
Control.
Claims (4)
1. a switch detection circuit, it is characterised in that: switch to be detected accesses operational amplification circuit after connecting reduction voltage circuit, point
Inverting input, the normal phase input end of operational amplifier B and the anti-phase input of operational amplifier C of other concatenation operation amplifier A
End, the outfan of operational amplifier A and operational amplifier B connects two inputs of AND circuit, the outfan of AND circuit
Connect and connect signal generator；The outfan of operational amplifier C connects cut-off signal generator.
Switch detection circuit the most according to claim 1, it is characterised in that: the outfan of AND circuit connects a connection
Display lamp.
Switch detection circuit the most according to claim 1, it is characterised in that: the input of each operational amplifier is all connected
Protected resistance.
Switch detection circuit the most according to claim 3, it is characterised in that: the forward phase input of operational amplifier A is defeated
Enter the normal phase input end input voltage V4 of the inverting input input voltage V3, operational amplifier C of voltage V2, operational amplifier B,
Switch front end input voltage V1, wherein V2 ＞ V1 ＞ V3 ＞ V4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610773817.1A CN106093774B (en) | 2016-08-31 | 2016-08-31 | A kind of switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610773817.1A CN106093774B (en) | 2016-08-31 | 2016-08-31 | A kind of switch detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106093774A true CN106093774A (en) | 2016-11-09 |
| CN106093774B CN106093774B (en) | 2019-08-06 |
Family
ID=57224359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610773817.1A Active CN106093774B (en) | 2016-08-31 | 2016-08-31 | A kind of switch detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106093774B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505518A (en) * | 2016-12-27 | 2017-03-15 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device |
| CN112690862A (en) * | 2019-10-23 | 2021-04-23 | 苏州英途康医疗科技有限公司 | Medical instrument and element abnormality detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5294881A (en) * | 1991-03-12 | 1994-03-15 | Valeo Equipements Electriques Moteur | Circuit for detecting the state of a switch, in particular a car key contact in a voltage regulator of an alternator |
| CN102736038A (en) * | 2012-06-29 | 2012-10-17 | 浪潮电子信息产业股份有限公司 | Abnormal power supply accurate positioning and warning device |
| CN104000582A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Lead falling detection device for electrocardiogram monitoring device |
| CN105277834A (en) * | 2014-06-18 | 2016-01-27 | 艾默生网络能源有限公司 | Detection circuit |
-
2016
- 2016-08-31 CN CN201610773817.1A patent/CN106093774B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5294881A (en) * | 1991-03-12 | 1994-03-15 | Valeo Equipements Electriques Moteur | Circuit for detecting the state of a switch, in particular a car key contact in a voltage regulator of an alternator |
| CN102736038A (en) * | 2012-06-29 | 2012-10-17 | 浪潮电子信息产业股份有限公司 | Abnormal power supply accurate positioning and warning device |
| CN104000582A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Lead falling detection device for electrocardiogram monitoring device |
| CN105277834A (en) * | 2014-06-18 | 2016-01-27 | 艾默生网络能源有限公司 | Detection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505518A (en) * | 2016-12-27 | 2017-03-15 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device |
| CN112690862A (en) * | 2019-10-23 | 2021-04-23 | 苏州英途康医疗科技有限公司 | Medical instrument and element abnormality detection method |
| CN112690862B (en) * | 2019-10-23 | 2022-07-19 | 苏州英途康医疗科技有限公司 | Medical instrument and element abnormality detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106093774B (en) | 2019-08-06 |
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