CN217385788U - Broken wire detection circuit - Google Patents
Broken wire detection circuit Download PDFInfo
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- CN217385788U CN217385788U CN202220897721.7U CN202220897721U CN217385788U CN 217385788 U CN217385788 U CN 217385788U CN 202220897721 U CN202220897721 U CN 202220897721U CN 217385788 U CN217385788 U CN 217385788U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model relates to a disconnection detection circuit, external input switch S1 links to each other with input 2 of opto-isolator U1 after establishing ties with disconnection switch S3, external input switch S1 links to each other with input 1 of opto-isolator U1 and opto-isolator U2 through diode D3 respectively after establishing ties with disconnection switch S3, output 4 of opto-isolator U1 links to each other with the A input of oscilloscope, input 2 of opto-isolator U2 links to each other with the input of diode D4, the output of diode D4 is earthed through parallelly connected resistance R1 and resistance R4, output 4 of opto-isolator U2 links to each other with the B input of oscilloscope, output 4 of opto-isolator U1 links to each other with one end of resistance R2, the other end of resistance R2 links to each other with one end of resistance R3, meanwhile, the other end of the resistor R3 is connected with an output end 4 of the optical coupler isolator U1. The utility model discloses can realize the automatic checkout of the detection of switching value signal and broken string simultaneously.
Description
Technical Field
The utility model relates to a broken string detection circuitry belongs to digital industrial control technical field.
Background
The switching value signal refers to logic signals of 0 and 1. In the field of automation, many occasions need to detect the switching value signal, but various problems often occur in a detection circuit of the switching value signal, so that detection errors of the switching value signal are caused. The input part of the circuit for detecting the disconnection is shown in fig. 1, a resistor R5 is connected in parallel at two ends of the input signal of the relay, and the end a and the end B are input ends of the circuit for detecting the disconnection. Therefore, it is necessary for those skilled in the art to provide a reliable switching value signal detection circuit, which can accurately detect the switching value signal and can detect whether the detection circuit has a fault.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a broken string detection circuitry, can realize the detection of switching value signal and the automated inspection of broken string simultaneously.
The utility model discloses a disconnection detection circuit, including pulse signal input V2, still include external input switch S1 and disconnection switch S3, external input switch S1 links to each other with input 2 of opto-isolator U1 after establishing ties with disconnection switch S3, external input switch S1 links to each other with input 1 of opto-isolator U1 and opto-isolator U2 respectively through diode D3 after establishing ties with disconnection switch S3, output 4 of opto-isolator U1 links to each other with the A input of oscilloscope, input 2 of opto-isolator U2 links to each other with the input of diode D4, the output of diode D4 is through parallelly connected resistance R1 and resistance R4 ground connection, output 4 of opto-isolator U2 links to each other with the B input of oscilloscope, output 4 of opto-isolator U1 links to each other with one end of resistance R539R 2, the other end of resistance R2 links to each other with one end of resistance R3, and the other end of the resistor R3 is connected with an output end 4 of the optical coupler isolator U1.
Further, the input end 1 of the optical coupler isolator U1 and the optical coupler isolator U2 is connected with a power supply VCC through a resistor R6.
Further, the resistance of the resistor R2 is 20k Ω, the resistance of the resistor R3 is 100k Ω, the resistances of the resistors R1 and R4 are both 8.2k Ω, and the resistance of the resistor R7 is 4.7k Ω.
Further, the voltage value of the power supply VCC is 24V, and the resistor R6 is 30k Ω.
Further, the model of the diode D3 is 1N4004G, and the model of the diode D4 is 1N 4149.
Further, the light coupling isolator U1 and the light coupling isolator U2 are PS2501 in model.
Furthermore, the pulse signal output by the pulse signal input end V2 is a 3.3V-0V, 5Hz pulse signal.
The utility model has the advantages that: the system adopts V2 to input 5Hz pulse signals to provide pull-up signals for an optical coupler, the circuit adopts an oscilloscope to detect output signals of the optical coupler, the optical coupler detection signals are respectively input to the A end and the B end of the oscilloscope as shown in figure 2, and the 5Hz pulse signals are used for preventing external interference signals from influencing the circuit and improving the reliability and the stability of signal detection.
(2) The utility model discloses easily realize in engineering application, the input that a circuit realized the switching value signal detects with the automated inspection of broken string. Through engineering practical application, the method completely meets the requirements of field input detection and disconnection detection of the switching value signals, has good operation, and can realize the functions of input detection and disconnection detection of the switching value signals.
Drawings
FIG. 1 is a schematic diagram of an input circuit for line break detection;
FIG. 2 is a schematic diagram of the disconnection detection circuit of the present invention;
FIG. 3 is a diagram of the externally input pulse signal of the present invention;
fig. 4 is a pulse signal diagram when the external input switch S1 and the disconnection switch S3 are closed according to the present invention;
fig. 5 is a pulse signal diagram when the external input switch S1 turns off the disconnection switch S3 according to the present invention;
fig. 6 is a pulse signal diagram of the disconnection switch S3 according to the present invention in the disconnected state.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in FIG. 2, the disconnection detection circuit of the present invention comprises a pulse signal input terminal V2, and further comprises an external input switch S1 and a disconnection switch S3, wherein the external input switch S1 and the disconnection switch S3 are connected in series and then connected to an input terminal 2 of an opto-isolator U1, the external input switch S1 and the disconnection switch S3 are connected in series and then connected to an input terminal 1 of an opto-isolator U1 and an input terminal 1 of the opto-isolator U2 respectively through a diode D3, an output terminal 4 of the opto-isolator U1 is connected to an input terminal A of an oscilloscope, an input terminal 2 of the opto-isolator U2 is connected to an input terminal of a diode D4, an output terminal of the diode D4 is grounded through a resistor R1 and a resistor R4 which are connected in parallel, an output terminal 4 of the opto-isolator U2 is connected to an input terminal B of the oscilloscope, an output terminal 4 of the opto-isolator U1 is connected to one end of a resistor R2, the other terminal of a resistor R2 is connected to one end of a resistor R3, and the other terminal of the resistor R2 is connected to one end of the pulse signal input terminal V2, the other end of the resistor R3 is connected with the output end 4 of the optical coupler isolator U1.
And the input ends 1 of the optocoupler isolator U1 and the optocoupler isolator U2 are connected with a power supply VCC through a resistor R6. The resistance of the resistor R2 is 20k Ω, the resistance of the resistor R3 is 100k Ω, the resistances of the resistors R1 and R4 are both 8.2k Ω, and the resistance of the resistor R7 is 4.7k Ω. The voltage value of the power supply VCC is 24V, and the resistance R6 is 30k Ω. The model of the diode D3 is 1N4004G, and the model of the diode D4 is 1N 4149. The model of the optical coupler isolator U1 and the optical coupler isolator U2 is PS 2501. The pulse signal output by the pulse signal input end V2 is a 3.3V-0V, 5Hz pulse signal.
The utility model discloses use external input switch S1 simulation external input switching value signal, use disconnection switch S3 simulation external disconnection state, the circuit adopts 24V DC supply, the system uses V2 to input 5Hz pulse signal, provide the pull-up signal for the opto-coupler, the circuit adopts oscilloscope detection opto-coupler output signal, the A and the B end of oscilloscope are imported respectively to the opto-coupler detection signal shown in fig. 2, use 5Hz pulse signal in order to prevent the influence of external interference signal to the circuit, improve signal detection reliability and stability. Diode D3 protects the circuit from reverse connection and protects the optocoupler when the circuit is coupled to a very high reverse voltage. Fig. 3 shows an externally input pulse signal.
As shown in fig. 4, the resistors R6, R7, R1, and R4 are voltage dividing resistors, when the external input switch S1 and the disconnection switch S3 are closed, a current passes through the resistors R6, U1, and the external input switch S1 to GND, another current passes through the resistor R6, the optocoupler isolator U2, the diode D4, the resistors R1, and R4, the voltage U at the input end of the optocoupler isolator U1 is sufficient for the optocoupler isolator U1 to be turned on, and at this time, the optocoupler isolator U1 is turned on to output a low level signal; the optical coupler isolator U2 can not be conducted due to the fact that the voltage of the input end 1 is low, the optical coupler isolator U2 can not be conducted at the moment, and 5Hz pulse signals are output under the action of the pull-up resistor R3.
As shown in fig. 5, when the external input switch S1 turns off the disconnection switch S3 to be turned on, a current passes through the resistor R6, the opto-isolator U1, and the resistor R7 to GND, and another current passes through the resistor R6, the opto-isolator U2, the diode D4, the resistor R1, and the resistor R4, so that the voltage of the resistor at the input end of the opto-isolator U1 is divided enough for the opto-isolator U1 to be turned on, and at this time, the opto-isolator U1 is turned on to output a low level; the voltage of the input end 1 of the optical coupler isolator U2 is the enough conduction of the optical coupler isolator U2 of the divided voltage of the resistor R6 and the resistor R7, and the optical coupler isolator U2 conducts a low-level signal at the moment.
As shown in fig. 6, when the disconnect switch S3 is turned off, current passes through the resistor R6, the optocoupler isolator U2, the diode D4, the resistors R1 and R4, the ground of the optocoupler isolator U1 is disconnected, and the U1 cannot be turned on to output a 5Hz pulse signal under the action of the pull-up resistor R2; the voltage of the input end 1 of the optical coupler isolator U2 is the enough conduction of the optical coupler isolator U2 of the divided voltage of the resistor R6 and the resistor R7, and the optical coupler isolator U2 conducts a low-level signal at the moment.
The above description is only one embodiment of the present invention, and although the present invention is disclosed as above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A disconnection detection circuit is characterized by comprising an external input switch S1 and a disconnection switch S3, wherein the external input switch S1 and the disconnection switch S3 are connected in series and then connected with an input end 2 of an optical coupling isolator U1, the external input switch S1 and the disconnection switch S3 are connected in series and then respectively connected with an input end 1 of the optical coupling isolator U1 and an input end 1 of an optical coupling isolator U2 through a diode D3, an output end 4 of the optical coupling isolator U1 is connected with an input end A of an oscilloscope, an input end 2 of the optical coupling isolator U2 is connected with an input end of the diode D4, an output end of the diode D4 is grounded through a resistor R1 and a resistor R4 which are connected in parallel, an output end 4 of the optical coupling isolator U2 is connected with an input end B of the oscilloscope, an output end 4 of the optical coupling isolator U1 is connected with one end of a resistor R2, the other end of a resistor 539R 2 is connected with one end of a resistor R3 and an output end of a pulse signal V2, the other end of the resistor R3 is connected with the output end 4 of the optocoupler isolator U1.
2. The disconnection detection circuit of claim 1, wherein an input terminal 1 of the optocoupler U1 and optocoupler U2 is connected to a power supply VCC through a resistor R6.
3. The disconnection detection circuit of claim 1, wherein the resistance of the resistor R2 is Ω 20k, the resistance of the resistor R3 is Ω 100k, the resistances of the resistors R1 and R4 are Ω 8.2k, and the resistance of the resistor R7 is Ω 4.7 k.
4. The disconnection detection circuit of claim 2, wherein the voltage of the power source VCC is 24V, and the resistor R6 is 30 Ω.
5. The disconnection detection circuit of claim 1, wherein the diode D3 has a model number of 1N4004G, and the diode D4 has a model number of 1N 4149.
6. The disconnection detection circuit of claim 1, wherein said opto-isolator U1 and opto-isolator U2 are of type PS 2501.
7. The disconnection detecting circuit of claim 1, wherein the pulse signal output from the pulse signal input terminal V2 is a 3.3V-0V, 5Hz pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220897721.7U CN217385788U (en) | 2022-04-19 | 2022-04-19 | Broken wire detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220897721.7U CN217385788U (en) | 2022-04-19 | 2022-04-19 | Broken wire detection circuit |
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| CN217385788U true CN217385788U (en) | 2022-09-06 |
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| CN202220897721.7U Active CN217385788U (en) | 2022-04-19 | 2022-04-19 | Broken wire detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115865062A (en) * | 2023-02-20 | 2023-03-28 | 浙江国利信安科技有限公司 | Digital quantity output module |
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- 2022-04-19 CN CN202220897721.7U patent/CN217385788U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115865062A (en) * | 2023-02-20 | 2023-03-28 | 浙江国利信安科技有限公司 | Digital quantity output module |
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