CN111983520B - Circuit breaking monitoring device - Google Patents
Circuit breaking monitoring device Download PDFInfo
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- CN111983520B CN111983520B CN202010737719.9A CN202010737719A CN111983520B CN 111983520 B CN111983520 B CN 111983520B CN 202010737719 A CN202010737719 A CN 202010737719A CN 111983520 B CN111983520 B CN 111983520B
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- connector
- circuit
- monitoring device
- resistance network
- photoelectric
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides a circuit disconnection monitoring device, which comprises a monitoring end, a first connector and a second connector, wherein the first connector and the second connector can be matched and butted; the photoelectric receiving unit encapsulated by the first connector is used for receiving the optical signal of the photoelectric emitting unit in the second connector and transmitting the optical signal to the input end of the counter, and the output end of the counter is connected with the address end of the analog switch; the first resistance network comprises a plurality of resistances which are respectively connected with the switch action ends of the analog switches; the resistance network connecting circuit is used for connecting the first resistance network to the input end of the measuring circuit, and the output of the measuring circuit is connected to the input end of the control unit through the signal conversion circuit; the control unit comprises equivalent resistance sequence tables corresponding to different analog switch addresses. The invention can perform monotone increasing counting according to the measured resistance change, and the uniqueness of the counting result ensures the accuracy and the safety of the line disconnection monitoring.
Description
Technical Field
The invention relates to the field of line monitoring, in particular to a line disconnection monitoring device.
Background
The line is normally connected with the communication security of the customs and the production security of enterprises, in particular to important equipment related to safe production. For the part production or temporary detection personnel, one of the production risks facing enterprises is realized by temporarily disconnecting a detection line or reducing necessary operation procedures; the wiring of some equipment protection devices is removed and not discovered in time, which may expose production personnel to significant safety hazards; in addition, in order to avoid information leakage, it is necessary for enterprises to prevent the risk of tapping or switching an important line after the important line is pulled out halfway. Although some existing communication modules can identify connection of on-off of a line, the existing communication modules are only applied to communication lines, are poor in concealment, and are difficult to identify the situation of reconnection after short-time disconnection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a circuit disconnection monitoring device which solves the problem that the circuit disconnection is difficult to monitor at present.
According to an embodiment of the invention, a circuit disconnection monitoring device comprises a monitoring end, a first connector and a second connector, wherein the first connector and the second connector can be matched and butted; the first connector is packaged with a photoelectric receiving unit, an edge-triggered counter, an analog switch, a first resistance network and a first power circuit for providing power needed by the first connector; the second connector is packaged with a photoelectric emission unit and a resistance network connecting circuit; the monitoring end comprises a second power supply circuit, a measuring circuit, a signal conversion circuit, a control unit and an alarm unit; the photoelectric receiving unit is used for receiving the optical signal of the photoelectric transmitting unit and transmitting the optical signal to the input end of the counter, and the output of the counter is connected with the address end of the analog switch; the first resistance network comprises a plurality of resistances which are respectively connected with the switch action ends of the analog switches, so that the address signals of different analog switches trigger equivalent output resistances which are uniquely corresponding to the first resistance network; the resistance network connecting circuit is used for connecting the first resistance network to the input end of the measuring circuit, and the output of the measuring circuit is connected to the input end of the control unit through the signal conversion circuit; the control unit comprises equivalent resistance sequence tables corresponding to different analog switch addresses; the second power supply circuit provides electricity needed by the measuring circuit, the control unit and the second connector.
Furthermore, a second resistor network is packaged in the second connector, and an equivalent resistor output end of the second resistor network is connected with an input end of the measuring circuit to be used as a comparison reference for measuring the first resistor network.
Furthermore, the first connector further comprises a first communication end, and correspondingly, the second connector comprises a second communication end to be connected with the first communication end in a matching manner; the second communication terminal is in communication connection with the control unit.
Further, the photoelectric emission unit is an infrared photoelectric emission unit, and correspondingly, the photoelectric receiving unit is an infrared photoelectric receiving unit.
Further, the measuring circuit comprises one of an adding circuit, a subtracting circuit, a differential amplifying circuit and a proportional amplifying circuit.
Further, the signal conversion circuit comprises an analog-to-digital conversion circuit.
Further, the alarm unit comprises an audible and visual alarm.
Furthermore, the first connector and the second connector both comprise a glue-pouring packaging body.
Furthermore, a first opening is formed in the first connector, a second opening is formed in the second connector, and after the first connector is in butt joint with the second connector, the first opening and the second opening are opposite, so that the receiving area of the photoelectric receiving unit is opposite to the emitting area of the photoelectric emitting unit.
Furthermore, the first connector is further packaged with an encoder, the input of the encoder is respectively connected with the output of the counter and the redundant end of the second communication end, and the output of the encoder is connected with the address end of the analog switch.
When the device is used, the first connector and the second connector are in matched butt joint, so that the photoelectric receiving unit can receive infrared light emitted by the photoelectric emitting unit, and the infrared light is invisible and has certain concealment, when the first connector and the second connector are disconnected, or a cable connected with the second connector is integrally broken, or a second power circuit cannot provide power, the photoelectric receiving unit of the first connector jumps at least once edge of a photoelectric signal from existence to nonexistence, the counter counts correspondingly, and triggers the analog switch to act to obtain the only corresponding equivalent output resistance of the first resistance network, and the control unit can conveniently perform disconnection identification counting by combining an equivalent resistance sequence table corresponding to different analog switch addresses contained by the measuring circuit and the control unit; therefore, no matter how the counting of the counter changes or cycles, the control unit can identify the measured resistance change process and perform monotone increasing counting, and simultaneously, the problem that the line change cannot be found only through digital signal counting is avoided, and the uniqueness of the counting result ensures the accuracy and the safety of line disconnection monitoring on the basis. In order to strengthen the initiative and the accuracy of monitoring in the process of equipment maintenance or line maintenance, the control unit can input a random signal to the encoder to encode together with the output of the counter, so that the regularity of the change of the equivalent resistance of the first resistance network or illegal line reconnection based on the regularity is avoided, or false resistance connection is realized, and the safety is higher.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
FIG. 2 is a diagram of one embodiment of a first power circuit and a second power circuit.
Fig. 3 is a schematic diagram of the first resistor network module and the second resistor network module.
FIG. 4 is a diagram of one embodiment of a signal conversion circuit.
Detailed Description
The technical solution of the present invention is further described with reference to the drawings and the embodiments.
As shown in FIG. 1, the present embodiment provides a circuit disconnection monitoring device, which includes a monitoring terminal C,
The first connector A and the second connector B can be matched and butted; wherein the content of the first and second substances,
the first connector is packaged with a photoelectric receiving unit, an edge triggered counter, an encoder, a first communication end, an analog switch, a first resistance network and a first power supply circuit for supplying power required by the first connector;
the second connector is packaged with a photoelectric emission unit, a second communication end, a second resistance network and a resistance network connecting circuit; the monitoring end C comprises a second power supply circuit, a measuring circuit, a signal conversion circuit, a control unit and an alarm unit; the second communication terminal is connected with the first communication terminal in a matching manner; the second communication end is in communication connection with the control unit; the photoelectric receiving unit is used for receiving the optical signal of the photoelectric emission unit and transmitting the optical signal to the input end of the counter, and the counter can be an edge trigger or pulse trigger type counter so as to conveniently identify the change situations of the detachment and the connection of the first connector and the second connector; the output of the counter is connected with the address end of the analog switch; the first resistor network comprises a plurality of resistors respectively connected to the switch-acting terminals of the analog switches, so that the address signals of different analog switches trigger the equivalent output resistors uniquely corresponding to the first resistor network, as illustrated in fig. 3. (alternatively, a digital potentiometer can be selected to replace the analog switch and the first resistor network, but the digital potentiometer can easily know the parameter specification and the change rule); the resistance network connecting circuit is used for connecting the first resistance network to the input end of the measuring circuit, and if the first resistance network only has 2 joints for output as shown in figure 3, the resistance network connecting circuit only needs to be connected with two corresponding joints; the output of the measuring circuit is connected to the input end of the control unit through the signal conversion circuit; the control unit comprises an equivalent resistance sequence table or an equivalent resistance interval sequence table corresponding to different analog switch addresses, such as 1K corresponding to address 00, 5K corresponding to address 01, 10K corresponding to address 10 and the like; the equivalent resistance output of the second resistance network is connected to the input of the measuring circuit for use as a reference for measuring the first resistance network. In general, the resistance of the cable is low, but the accumulated resistance of the longer cable cannot be ignored, and in order to avoid errors caused by the accumulated resistance, the influence of the accumulated resistance can be eliminated under the contrast reference of the second resistance network, so that the control unit can more accurately know the equivalent output resistance of the first resistance network; the second power supply circuit provides electricity needed by the measuring circuit, the control unit and the second connector. It should be noted that, the first power circuit and the second power circuit may be powered by a battery, or may be powered by ac to dc; fig. 2 shows one of the methods of converting ac to dc, in which after the inputs of the first power circuit and the second power circuit are connected to the L input and the N input of the utility power, the power voltage is converted by the rc voltage reducing module, the rectifying and filtering module, and the switching power module to be the dc output for each electrical component.
The photoelectric emission unit is an infrared photoelectric emission unit, and correspondingly, the photoelectric receiving unit is an infrared photoelectric receiving unit. Because the infrared light is invisible light, the signal transmission of the first connector and the second connector has strong concealment.
The measuring circuit comprises one of an adding circuit, a subtracting circuit, a differential amplifying circuit and a proportional amplifying circuit, and the hardware logic of the measuring circuit needs to be correspondingly reacted in the control unit by program logic so as to realize the correspondence between the hardware measurement and the coding control.
The signal conversion circuit includes an analog-to-digital conversion circuit. Taking a proportional amplifying circuit as an example, the input voltages u1 and u2 are supplied by the second power circuit, and the resistors R8 to R11 are all resistors with known resistance values of the monitoring terminal C, and are not affected by the long cable between the monitoring terminal C and the second connection terminal B, as shown in fig. 4, after both ends of R8 are connected to the first resistor network through the connector connection line, then R8 is connected in parallel with an equivalent resistor of the first resistor network correspondingly, and R9 is connected in parallel with an equivalent resistor of the second resistor network, in order to eliminate the influence of the cable length, an electronic control switch S7 may be added to be connected to the second resistor network to the access terminal of the measuring circuit, and the control terminal of the electronic control switch is connected to the output of the control unit, so that the control unit can know the equivalent resistance value or the distinct resistance value interval of the first resistor network according to the amplification formula of the proportional amplifying circuit and the parameter fed back by the measuring circuit, and can select a suitable resistance parameter, and the control unit can know the distinct address code of the equivalent resistor sequence table or the analog address code sequence table corresponding to the input by the equivalent resistor sequence table.
The alarm unit comprises an audible and visual alarm.
The first connector and the second connector both comprise glue pouring packaging bodies. Through the encapsulating, carry out the sealed back with electrical component, greatly increased the change of connector connect the degree of difficulty, the security has obtained the enhancement.
The first connector is provided with a first opening, the second connector is provided with a second opening, and after the first connector is in butt joint with the second connector, the first opening is opposite to the second opening, so that the receiving area of the photoelectric receiving unit is opposite to the emitting area of the photoelectric emitting unit. Therefore, the influence of external light can be avoided, the anti-interference performance is stronger, and the concealment and the safety are better.
The first connector is also packaged with a coder, the second communication end is provided with a redundant end so as to be connected with the output of the counter and the redundant end of the second communication end at the input of one coder respectively, and the output of the coder is connected with the address end of the analog switch; the control unit codes together with the output of the counter through the second communication end so as to avoid the regularity of the equivalent resistance change of the first resistance network, or illegal line reconnection based on the regularity, or false resistance connection, and ensure higher safety. For example, the output of the counter is 0100, the control unit outputs a signal with a larger bit width, such as 10000, and the signal is transmitted to the input of the encoder through the second communication terminal and the first communication terminal, the output of the encoder is 10100, the analog switch is correspondingly switched to connect the corresponding resistors, and the 10000 output is actively transmitted by the control unit, so that the control unit can reversely check the corresponding resistor counting condition according to the sequence by combining the information fed back by the measurement circuit. And under the condition of external malicious code input setting, the control unit does not start corresponding code comparison logic, so that the control unit can easily find that the information fed back by the measurement does not correspond to the information fed back by the measurement, and can become an alarm triggering condition to start alarm. The control unit includes one or more of an add-bit output logic (in the above example, an add-bit output logic, that is, an output signal bit width is greater than a counter bit width, but remains 0 at a low bit equal to the counter bit width), a full code output logic (that is, 1 or 0 which is the same as the counter bit width is output and is used for a check test), a repeat output logic (that is, a corresponding encoding signal is output according to a signal fed back by a last measurement module, and is input into the encoding unit after being subjected to exclusive-nor logic and exclusive-or logic calculation according to the bit number with the counter output, for example, 1001 and 1010 are subjected to exclusive-nor logic, and then the output is switched to a corresponding address 1110), and a random number logic (that the control unit generates a random number signal output by a program, but keeps storing the random number for comparison), when the control unit adopts a plurality of logics, a selection logic may be set, that is, that the control unit is switched to a specific logic according to conditions such as time and input selection of the control unit, thereby increasing the difficulty of external bypass monitoring on software and hardware, and improving security.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention/utility model and not for limiting, although the present invention/utility model is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention/utility model can be modified or substituted equally without departing from the spirit and scope of the technical solutions of the present invention/utility model, and they should be covered within the scope of the claims of the present invention/utility model.
Claims (10)
1. A circuit disconnection monitoring device is characterized in that: the connector comprises a monitoring end, a first connector and a second connector which can be matched and butted; the first connector is packaged with a photoelectric receiving unit, an edge-triggered counter, an analog switch, a first resistance network and a first power supply circuit for supplying power required by the first connector; the second connector is packaged with a photoelectric emission unit and a resistance network connecting circuit; the monitoring end comprises a second power supply circuit, a measuring circuit, a signal conversion circuit, a control unit and an alarm unit; the photoelectric receiving unit is used for receiving the optical signal of the photoelectric transmitting unit and transmitting the optical signal to the input end of the counter, and the counter is triggered and connected with the address end of the analog switch; the first resistance network comprises a plurality of resistances respectively connected with the switch action ends of the analog switches, so that address signals of different analog switches trigger equivalent output resistances uniquely corresponding to the first resistance network; the resistance network connecting circuit is used for connecting the first resistance network to the input end of the measuring circuit, and the output of the measuring circuit is connected to the input end of the control unit through the signal conversion circuit; the control unit comprises equivalent resistance sequence tables corresponding to different analog switch addresses; the second power supply circuit provides electricity needed by the measuring circuit, the control unit and the second connector.
2. A line break monitoring device as claimed in claim 1, characterized in that: and the second connector is further packaged with a second resistance network, and the equivalent resistance output end of the second resistance network is connected with the input end of the measuring circuit so as to be used as a comparison reference for measuring the first resistance network.
3. A line break monitoring device as claimed in claim 1, wherein: the first connector also comprises a first communication end, and correspondingly, the second connector comprises a second communication end to be connected with the first communication end in a matching way; the second communication terminal is in communication connection with the control unit.
4. A line break monitoring device as claimed in claim 1, characterized in that: the photoelectric emission unit is an infrared photoelectric emission unit, and correspondingly, the photoelectric receiving unit is an infrared photoelectric receiving unit.
5. A line break monitoring device as claimed in claim 1, characterized in that: the measuring circuit comprises one of an adding circuit, a subtracting circuit, a differential amplifying circuit and a proportional amplifying circuit.
6. A line break monitoring device as claimed in claim 1, wherein: the signal conversion circuit includes an analog-to-digital conversion circuit.
7. A line break monitoring device as claimed in claim 1, characterized in that: the alarm unit comprises an audible and visual alarm.
8. A line break monitoring device as claimed in claim 1, wherein: the first connector and the second connector both comprise glue pouring packaging bodies.
9. A line break monitoring device as claimed in claim 1, characterized in that: the first connector is provided with a first opening, the second connector is provided with a second opening, and after the first connector is in butt joint with the second connector, the first opening and the second opening are opposite, so that the receiving area of the photoelectric receiving unit is opposite to the emitting area of the photoelectric emitting unit.
10. A line break monitoring device as claimed in claim 3, characterized in that: the first connector is further packaged with an encoder, the input of the encoder is respectively connected with the output of the counter and the redundant end of the second communication end, and the output of the encoder is connected with the address end of the analog switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737719.9A CN111983520B (en) | 2020-07-28 | 2020-07-28 | Circuit breaking monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737719.9A CN111983520B (en) | 2020-07-28 | 2020-07-28 | Circuit breaking monitoring device |
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| Publication Number | Publication Date |
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| CN111983520A CN111983520A (en) | 2020-11-24 |
| CN111983520B true CN111983520B (en) | 2023-02-28 |
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| CN202010737719.9A Active CN111983520B (en) | 2020-07-28 | 2020-07-28 | Circuit breaking monitoring device |
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Citations (8)
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| US20100114391A1 (en) * | 2007-03-20 | 2010-05-06 | Eduardo Pedrosa Santos | System for acquisition of data and multiplication of signalling and protection contacts in equipments of substations and electric power plants and similar |
| WO2011117168A1 (en) * | 2010-03-26 | 2011-09-29 | Robert Bosch Gmbh | Method for monitoring lines by determining the electrical resistance |
| CN105245228A (en) * | 2015-09-28 | 2016-01-13 | 威海北洋光电信息技术股份公司 | Signal collection control circuit |
| CN106526477A (en) * | 2016-12-29 | 2017-03-22 | 重庆市渝展电气有限公司 | Multi-path switch state monitoring circuit |
| CN207717915U (en) * | 2018-01-11 | 2018-08-10 | 重庆电子工程职业学院 | A kind of CPLD breakpoint of cable positioning circuit |
| CN209946349U (en) * | 2019-04-01 | 2020-01-14 | 西安仕贤科技有限公司 | High-speed high-precision instantaneous collector ring loop disconnection automatic tester circuit |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
| CN111220930A (en) * | 2018-11-23 | 2020-06-02 | 上海海拉电子有限公司 | Electric automobile contactor, and detection device and method for on-off state of fuse |
-
2020
- 2020-07-28 CN CN202010737719.9A patent/CN111983520B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100114391A1 (en) * | 2007-03-20 | 2010-05-06 | Eduardo Pedrosa Santos | System for acquisition of data and multiplication of signalling and protection contacts in equipments of substations and electric power plants and similar |
| WO2011117168A1 (en) * | 2010-03-26 | 2011-09-29 | Robert Bosch Gmbh | Method for monitoring lines by determining the electrical resistance |
| CN105245228A (en) * | 2015-09-28 | 2016-01-13 | 威海北洋光电信息技术股份公司 | Signal collection control circuit |
| CN106526477A (en) * | 2016-12-29 | 2017-03-22 | 重庆市渝展电气有限公司 | Multi-path switch state monitoring circuit |
| CN207717915U (en) * | 2018-01-11 | 2018-08-10 | 重庆电子工程职业学院 | A kind of CPLD breakpoint of cable positioning circuit |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
| CN111220930A (en) * | 2018-11-23 | 2020-06-02 | 上海海拉电子有限公司 | Electric automobile contactor, and detection device and method for on-off state of fuse |
| CN209946349U (en) * | 2019-04-01 | 2020-01-14 | 西安仕贤科技有限公司 | High-speed high-precision instantaneous collector ring loop disconnection automatic tester circuit |
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