CN117496680A - Electric fire monitoring detector circuit - Google Patents
Electric fire monitoring detector circuit Download PDFInfo
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- CN117496680A CN117496680A CN202311559091.8A CN202311559091A CN117496680A CN 117496680 A CN117496680 A CN 117496680A CN 202311559091 A CN202311559091 A CN 202311559091A CN 117496680 A CN117496680 A CN 117496680A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000012545 processing Methods 0.000 claims abstract description 43
- 238000004891 communication Methods 0.000 claims abstract description 32
- 230000000007 visual effect Effects 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 230000003993 interaction Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 128
- 238000002955 isolation Methods 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012905 input function Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/04—Monitoring of the detection circuits
- G08B29/043—Monitoring of the detection circuits of fire detection circuits
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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Abstract
The invention discloses an electric fire monitoring detector circuit which comprises a power supply module, a control output module, a central processing unit module, a signal acquisition unit, a man-machine interaction unit and a communication module, wherein the signal acquisition unit is used for acquiring residual current and overcurrent in a load circuit, amplifying and filtering the residual current and the overcurrent, sending the residual current and the overcurrent into the central processing unit module for analysis and processing, judging whether detected current information is abnormal, and realizing real-time fault current information and early warning, alarm and control information display of the electric fire detector; and the LED indicator lamp and the buzzer are arranged, so that the function of audible and visual alarm is guaranteed.
Description
The application is a divisional application of a patent application named as an electric fire monitoring detector circuit, and the application date of the original application is 2017, 07 and 25, and the application number is 201710611435.3.
Technical Field
The invention relates to the field of detectors, in particular to an electric fire monitoring detector circuit.
Background
The following description is given of the background of the invention, but these descriptions do not necessarily constitute the prior art of the invention.
The electric fire monitoring equipment is characterized in that the electric fire monitoring equipment is formed by taking a computer as a main control upper computer, matching with a fireproof leakage alarming system terminal, a residual current detector and a plurality of circuit breakers with shunt tripping functions, connecting the electric fire monitoring equipment to the main control upper computer through two buses, and forming a complete fireproof leakage alarming system through application software; the main control computer has various functions of inspection, monitoring, sound alarm, printing, inquiry system and the like, and intelligent management is completed; the system adopts a distributed control scheme, and a microcomputer can monitor 512 fireproof electric leakage system terminals; the fireproof electric leakage system terminal can work independently, and various parameters of electricity consumption can be checked on site through the system terminal.
However, the existing electrical fire monitoring equipment is provided with a gas sensor for sensing toxic and harmful gases, a smoke sensor for sensing generated smoke, and a temperature sensor for sensing a temperature value and a temperature change rate, so that the electrical fire monitoring equipment does not detect the equipment, and once the electrical fire monitoring equipment fails, false alarm or missing alarm occurs easily, so that fire misalarm or fire occurrence does not occur, and serious loss occurs.
Disclosure of Invention
The invention aims to provide an electric fire monitoring detector circuit which is arranged in electric fire monitoring equipment and used for detecting the equipment and preventing the loss caused by accidents.
In order to solve the technical problems, the invention is realized by the following technical scheme: an electrical fire monitoring detector circuit comprising:
the power supply module is connected to the load circuit, converts the power supply of the power supply module and provides the power supply for the central processing unit module, the signal acquisition unit, the man-machine interaction unit and the communication module to use electricity;
the signal acquisition unit acquires a current signal of the load circuit through a current transformer, and sends the current signal to the central processing unit module connected with the signal acquisition unit through isolation, amplification and filtering treatment;
the central processing operation unit module is used for receiving the information transmitted by the signal acquisition unit module, analyzing, processing and judging the information, and realizing the functions of real-time fault current information, early warning, control information display and audible and visual warning of the electric fire detector;
the communication module is used for transmitting the data of the central processing unit module to the monitoring equipment and realizing timely alarm for finding faults;
the man-machine dialogue unit is connected to the central processing unit module and is used for facilitating a user to directly check the operation state of the fire monitoring detector and set parameters;
the control output module is arranged between the shunt release connected with the switch on the load line and the central processing unit module and is used for outputting an alarm protection signal and a release output signal and driving the shunt release connected with the control output module to act to control the switch on the load line;
the communication module comprises a signal sending circuit, a sending and receiving processing circuit and an anti-surge protection circuit; the anti-surge protection circuit comprises an upper computer connection module (J2), a bidirectional surge diode (TVS 1), a twelfth resistor (R12) and a rectifier bridge (DD 1); the upper computer connecting module (J2) is connected with one end of a twelfth resistor (R12) through a first communication bus (L1), the upper computer connecting module (J2) is connected with the other end of the bidirectional surge diode (TVS 1) through a second communication bus (L2), and one end of the twelfth resistor (R12) is connected with one end of the bidirectional surge diode (TVS 1); one end of the bidirectional surge diode (TVS 1) is also connected to a first input end of the rectifier bridge (DD 1), the other end of the bidirectional surge diode is connected to a second input end of the rectifier bridge (DD 1), a third output end of the rectifier bridge (DD 1) is connected with a VL-power supply, and a fourth output end of the rectifier bridge (DD 1) is connected with a VL+ power supply; the anti-surge protection circuit performs anti-surge protection through a bidirectional surge diode TVS1, the communication module is provided with a first optocoupler UP1, a second optocoupler UP2, a third optocoupler UP3 and a third optocoupler UP4 to form optocoupler isolation, and the upper computer sends a second communication 24V level control signal.
Preferably, the power supply module comprises a load connection module, a protection filter circuit, an AC/DC module and a DC/DC circuit; the second end and the three ends of the load connection module are connected to a protection filter circuit, the first end of the load connection module is connected to a ground wire, the protection filter circuit is connected to the alternating current input end of the AC/DC module, and the output end of the AC/DC module is connected to the DC/DC circuit for converting power.
Preferably, the protection filter circuit comprises a fuse, a piezoresistor, a thermistor, a first capacitor, a second capacitor and a third capacitor, wherein one end of the fuse is connected to the third end of the load connection module, the other end of the fuse is connected to one end of the piezoresistor, the other end of the piezoresistor is connected to the second end of the load connection module, one end of the piezoresistor is further connected to one end of the first capacitor, the other end of the piezoresistor is further connected to the other end of the first capacitor, one end of the first capacitor is connected to one end of the second capacitor, the other end of the first capacitor is further connected to one end of the third capacitor, one end of the third capacitor is further connected to the second alternating current input end of the AC/DC module, one end of the second capacitor is further connected to one end of the thermistor, the other end of the thermistor is connected to the first alternating current input end of the AC/DC module, and the first end of the load connection module, the other end of the third capacitor and the other end of the second capacitor are all grounded.
Preferably, the DC/DC circuit includes a first diode, a first inductor, a voltage stabilizing chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; one end of the fourth capacitor is connected to the VCC output end of the AC/DC module, the other end of the fourth capacitor is connected to the GND end of the AC/DC module, one end of the fourth capacitor is further connected to the negative electrode of the first diode, the negative electrode of the first diode is further connected to the first port of the first inductor, the second port of the first inductor is connected to one end of the fifth capacitor, the third port of the first inductor is connected to one end of the sixth capacitor, one end of the sixth capacitor is further connected with a +5V power supply, one end of the sixth capacitor is further connected to one end of the seventh capacitor, one end of the seventh capacitor is further connected to the input end of the voltage stabilizing chip, one end of the voltage stabilizing chip is further connected to one end of the eighth capacitor, one end of the eighth capacitor is further connected to the VDD power supply, and the other end of the fourth capacitor, the positive electrode of the first diode, the other end of the fifth capacitor, the other end of the sixth capacitor, the other end of the seventh capacitor, the GND end of the voltage stabilizing chip and the other end of the eighth capacitor are all connected to the GND.
Preferably, the signal acquisition unit comprises a current transformer, at least one isolation protection circuit and a current sampling module connected with the isolation protection circuit; the isolation protection circuit comprises a third resistor, a third optocoupler, a first resistor, a second resistor, a ninth capacitor and a first clamping diode; the current transformer samples residual current and overcurrent which are connected to a load circuit and is connected to one end of a third resistor, the other end of the third resistor is connected to the second end of a third optocoupler, the first end of the third optocoupler is connected with a VDD power supply, the fourth end of the third optocoupler is connected with a VCC power supply, the third end of the third optocoupler is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor, one end of the second resistor is also connected with one end of a ninth capacitor, the other end of the second resistor is also connected to the other end of a ninth capacitor, one end of the ninth capacitor is also connected to one end of a first clamping diode, and the other end of the ninth capacitor is connected to the other end of the first clamping diode; and two ends of the first clamping diode are connected to the current sampling module.
Preferably, the current sampling module comprises a first operational amplifier, a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a tenth capacitor; one end of the first clamping diode is connected to the in-phase input end of the second operational amplifier, the other end of the first clamping diode is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the inverting input end of the second operational amplifier, one end of the seventh resistor is connected to one end of the sixth resistor, one end of the sixth resistor is connected to the other end of the tenth capacitor, the inverting input end of the second operational amplifier is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected to the in-phase input end of the first operational amplifier, the other end of the sixth resistor is connected to the inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the output end of the first operational amplifier, the output end of the first operational amplifier is connected to one end of the tenth capacitor, and one end of the tenth capacitor is connected to the central processing operation unit module.
Preferably, the central processing unit module adopts a 24FJ32GA002 singlechip, which is a 16-bit singlechip of PIC24 series, and is provided with 16 programmable I/O ports, programFlash Memory 32KB and RAMsizer K; the man-machine conversation unit is provided with a display for detecting current operation parameters of a controlled loop in real time, a keyboard for realizing an input function of man-machine conversation, an LED indicator lamp for indicating the operation state of the electric fire monitoring and detecting device and a buzzer for prompting the alarm state of the electric fire monitoring and detecting device.
Preferably, the receiving processing circuit includes a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a fourth optocoupler, a fifth optocoupler, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a first triode, a second triode, and a third triode; the positive electrode of the second diode is connected with a VL+ power supply, the other end of the eleventh capacitor is connected with a VL-power supply, the negative electrode of the second diode is connected with one end of a thirteenth resistor, the other end of the thirteenth resistor is connected with one end of the eleventh capacitor, the other end of the thirteenth resistor is connected with one end of a fourteenth resistor, one end of the fourteenth resistor is also connected with a collector electrode of a first triode, the other end of the fourteenth resistor is connected with a base electrode of the first triode, the other end of the fourteenth resistor is also connected with one end of a twelfth capacitor, the base electrode of the first triode is also connected with the negative electrode of a third diode, the other end of the twelfth capacitor is also connected with the other end of the eleventh capacitor and the positive electrode of the third diode respectively, the positive electrode of the third diode is also connected with the other end of the thirteenth capacitor, one end of the thirteenth capacitor is further connected to the emitter of the first triode, the emitter of the first triode is further connected to one end of a seventeenth resistor, the positive electrode of the second diode is further connected to one end of a fifteenth resistor, the other end of the fifteenth resistor is further connected to the positive electrode of a sixth diode, the negative electrode of the sixth diode is further connected to the base of the third triode, one end of the fifteenth resistor is further connected to the positive electrode of a fourth diode, the negative electrode of the fourth diode is connected to the negative electrode of a fifth diode, the negative electrode of the fifth diode is connected to one end of a sixteenth resistor, the other end of the sixteenth resistor is connected to a VL-power supply, the positive electrode of the fifth diode is connected to the other end of the seventeenth resistor, the other end of the seventeenth resistor is further connected to the base of the second triode, the emitter of the second triode is further connected with one end of a seventeenth resistor, the collector of the second triode is connected with one end of a nineteenth resistor, the other end of the nineteenth resistor is connected with the first end of a fourth optocoupler, the collector of the third triode is connected with one end of an eighteenth resistor, the other end of the eighteenth resistor is connected with the negative electrode of a seventh diode, the negative electrode of the seventh diode is further connected with the second end of the fourth optocoupler, the emitter of the third triode is connected with the first end of the fifth optocoupler, the other end of the thirteenth capacitor is further connected with the positive electrode of a seventh diode, and the positive electrodes of the thirteenth capacitor and the seventh diode are connected with the second end of the fifth optocoupler; the fourth end of the fourth optical coupler is connected with one end of a twentieth resistor, the other end of the twentieth resistor is connected with a VDD power supply, one end of the twentieth resistor is also connected with one end of a fourteenth capacitor, the other end of the fourteenth capacitor and the third end of the fourth optical coupler are both grounded, and one end of the fourteenth capacitor is also connected with the central processing unit module; the fourth end of the fifth optocoupler is connected with a VDD power supply, the third end of the fifth optocoupler is connected with one end of a twenty-first resistor, one end of the twenty-first resistor is also connected with one end of a fifteenth capacitor, and the other end of the fifteenth capacitor and the other end of the twenty-first resistor are grounded; one end of the fifteenth capacitor is also connected to the central processing unit module.
Preferably, the signal transmitting circuit includes a first optocoupler, a second optocoupler, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor, which are used for isolating a VL power supply and a VDD power supply in the communication module; the first end of the first optocoupler is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with a VDD power supply, the second end of the first optocoupler and the second end of the second optocoupler are both connected to a central processing unit module, the third end of the first optocoupler and the third end of the second optocoupler are both connected with a VL-power supply, the first end of the second optocoupler is connected with one end of a ninth resistor, the other end of the ninth resistor is connected with the VDD power supply, the fourth end of the first optocoupler is connected with one end of a tenth resistor, the other end of the tenth resistor is connected with one end of an eleventh resistor, one end of the eleventh resistor is also connected with a VL+ power supply, and the other end of the eleventh resistor is connected with the fourth end of the second optocoupler.
The invention collects the residual current and the overcurrent in the load circuit through the signal collection unit, and sends the residual current and the overcurrent to the central processing unit module for analysis and treatment after amplification and filtering treatment, and judges whether the detected current information is abnormal, thereby realizing the real-time fault current information and early warning, alarming and control information display of the electric fire detector; and the LED indicator lamp and the buzzer are arranged, so that the function of audible and visual alarm is guaranteed.
Compared with the prior art, the invention has the following advantages: 1) The signal acquisition unit samples residual current and overcurrent of the load circuit, and the residual current and the overcurrent are amplified and filtered, so that the accuracy of data acquisition is enhanced; 2) The central processing unit module judges, analyzes and processes the detected and received data information, and achieves real-time fault current information and early warning, alarming and control information display of the electric fire detector; 3) The control output is used for outputting an alarm protection signal and a tripping output signal, and driving the shunt release connected with the control output to act to control a switch on a load circuit, so that the safety of the shunt release is improved; 4) The communication module transmits the arc signal data in real time in a two-bus communication mode, so that the timeliness of the alarm is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an electrical fire monitoring detector circuit of the present invention.
Fig. 2 is a schematic diagram of a power module according to the present invention.
Fig. 3 is a schematic diagram of an isolation protection circuit in a signal acquisition unit according to the present invention.
Fig. 4 is a schematic diagram of a current sampling module in the signal acquisition unit of the present invention.
Fig. 5 is a schematic diagram of a signal transmitting circuit in the communication module of the present invention.
Fig. 6 is a schematic diagram of a receiving processing circuit in the communication module of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In this embodiment, the power supply module is an AC220V/DC5V circuit, which filters the load power in the load circuit through the protection of a protection filter circuit formed by a fuse RF1, a varistor RV1, a thermistor NTC, a first capacitor C1, a second capacitor C2 and a third capacitor C3, and then enters the AC/DC module to convert the AC220V AC power of the load power into a DC5V power, where the DC5V power is used for supplying power to the acquisition unit, and the DC5V power also needs to pass through a DC/DC circuit formed by a first diode D1, a first inductor L1, a voltage stabilizing chip P1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8 to convert the DC5V power into a dc3.3v power for powering the central processing operation unit module, the man-machine conversation unit and the communication module.
In this embodiment, the signal acquisition unit samples the residual current and the overcurrent in the load circuit through the current transformer, the current information acquired by the current transformer is sent to the current sampling module through the third optocoupler UP3, the first resistor R1, the second resistor R2, the third resistor R3, the ninth capacitor C9, and the isolation protection circuit formed by the first clamp diode DS1, the current sampling module includes the operational amplifier circuit formed by the fifth resistor R5, the seventh resistor R7, and the second operational amplifier US2, and the amplifying filter circuit formed by the first operational amplifier US1, the fourth resistor R4, and the tenth capacitor C10, and the current information processed by the isolation protection circuit is amplified by the operational amplifier circuit and then enters the amplifying filter circuit for amplifying and filtering, and then is sent to the central processing unit module for analysis.
In this embodiment, the second resistor R2 is a sampling resistor, and two isolation protection circuits and two current sampling modules are disposed in the circuit.
In the implementation mode, a 24FJ32GA002 singlechip is adopted in a central processing unit module, which is a 16-bit singlechip of PIC24 series, and has 16 programmable I/O ports, program Flash Memory 32KB and RAMsizer K; the singlechip judges, analyzes and processes the detected and received information, and realizes the functions of real-time fault current information, early warning, alarming, control information display and audible and visual alarming of the electric fire detector; the singlechip receives the current information acquired and processed by the signal acquisition unit, judges whether the current is abnormal, and if so, gives out an audible and visual alarm, controls the output cutting circuit and transmits fault information to the upper computer.
In the embodiment, a man-machine dialogue unit connected with a central processing unit module is arranged for facilitating a user to clearly and intuitively check the running state of the electric fire monitoring detector and set parameters, and an LCD full Chinese liquid crystal display is arranged in the system, so that the current running parameters of a controlled loop can be monitored in real time; setting a keyboard to well complete the input function of man-machine conversation; setting an LED indicator lamp to indicate the running state of the electric fire monitoring detector; setting a buzzer to prompt the alarm state of the electric fire detection device; when an alarm exists, the electric fire monitoring detector sends out a fire alarm sound signal to remind a worker of timely solving the problem, the signal can be eliminated manually, and when an alarm signal is input, the fire alarm sound signal can be started again and kept until the electric fire monitoring detector is reset.
In this embodiment, when the sampled fault current information exceeds a value set in the central processing unit module, a control output module arranged between a shunt release connected with a switch on a load line and the central processing unit module outputs an alarm protection signal and a release output signal, and drives the shunt release connected with the shunt release to act, so that the switch on the load line is released; the control output module is a switch type relay, and the contact capacity is 250V AC/5A.
In the embodiment, the communication module transmits the data such as the arc signal and the like to the electric fire monitoring equipment in real time in a self-defined two-bus communication mode; if fault current is found, timely alarm can be realized; the upper computer is connected with the upper computer connecting module J2, and is used for sending 0V and 24V level control signals through the first communication bus L1 and the second communication bus L2, and the control signals are sent to the central processing unit module for analysis and processing after passing through the receiving and processing circuit and are used for controlling the monitoring detector.
In this embodiment, the central processing unit module transmits the data signal and processes the data signal by the signal transmitting circuit in the communication module, and communicates with the upper computer in a current manner.
In this embodiment, the anti-surge protection circuit in the communication module performs anti-surge protection through the bidirectional surge diode TVS1, and the communication module is provided with the first optocoupler UP1, the second optocoupler UP2, the third optocoupler UP3, and the third optocoupler UP4 to form optocoupler isolation, and the upper computer sends the second communication L224V level control signal, so that the communication between the detector and the host is stable in the communication mode of the 24V high voltage level, and the anti-electromagnetic interference capability is strong.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the particular embodiments described and illustrated herein, and that various changes, modifications, and improvements may be made to the exemplary embodiments by those skilled in the art without departing from the scope of the invention as defined in the appended claims.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. An electrical fire monitoring detector circuit, comprising:
the power supply module is connected to the load circuit, converts the power supply and provides the converted power supply for the central processing unit module, the signal acquisition unit, the man-machine interaction unit and the communication module to use electricity;
the signal acquisition unit acquires a current signal of the load circuit through the current transformer, and sends the current signal to the central processing unit module through isolation, amplification and filtering;
the central processing operation unit module is used for receiving the information transmitted by the signal acquisition unit, analyzing, processing and judging the information, and realizing the functions of real-time fault current information, early warning, control information display and audible and visual warning of the electric fire detector;
the communication module is used for transmitting the data of the central processing unit module to the monitoring equipment and realizing timely alarm for finding faults;
the man-machine interaction unit is connected to the central processing unit module and is used for directly checking the operation state of the fire monitoring detector and setting parameters by a user;
the control output module is arranged between the shunt release connected with the switch on the load line and the central processing unit module and is used for outputting an alarm protection signal and a release output signal and driving the shunt release connected with the control output module to act to control the switch on the load line;
the communication module comprises a signal sending circuit, a sending and receiving processing circuit and an anti-surge protection circuit; the anti-surge protection circuit comprises an upper computer connection module (J2), a bidirectional surge diode (TVS 1), a twelfth resistor (R12) and a rectifier bridge (DD 1); the upper computer connecting module (J2) is connected with one end of a twelfth resistor (R12) through a first communication bus (L1), the upper computer connecting module (J2) is connected with the other end of the bidirectional surge diode (TVS 1) through a second communication bus (L2), and one end of the twelfth resistor (R12) is connected with one end of the bidirectional surge diode (TVS 1); one end of the bidirectional surge diode (TVS 1) is also connected to a first input end of the rectifier bridge (DD 1), the other end of the bidirectional surge diode is connected to a second input end of the rectifier bridge (DD 1), a third output end of the rectifier bridge (DD 1) is connected with a VL-power supply, and a fourth output end of the rectifier bridge (DD 1) is connected with a VL+ power supply; the anti-surge protection circuit performs anti-surge protection through a bidirectional surge diode TVS1, the communication module is provided with a first optocoupler UP1, a second optocoupler UP2, a third optocoupler UP3 and a third optocoupler UP4 to form optocoupler isolation, and the upper computer sends a second communication 24V level control signal.
2. An electrical fire monitoring detector circuit as defined in claim 1 wherein: the power supply module comprises a load connection module (J1), a protection filter circuit, an AC/DC module and a DC/DC circuit; the second end and the third end of the load connection module (J1) are connected to a protection filter circuit, the first end of the load connection module (J1) is connected to a ground wire, the protection filter circuit is connected to an alternating current input end of an AC/DC module, and an output end of the AC/DC module is connected to a DC/DC circuit for converting a power supply.
3. An electrical fire monitoring detector circuit according to claim 2, characterized in that the protection filter circuit comprises a fuse (RF 1), a varistor (RV 1), a thermistor (NTC), a first capacitor (C1), a second capacitor (C2) and a third capacitor (C3), one end of the fuse (RF 1) being connected to a third end of the load connection module (J1), the other end of the fuse (RF 1) being connected to one end of the varistor (RV 1), the other end of the varistor (RV 1) being connected to a second end of the load connection module (J1), one end of the varistor (RV 1) being further connected to one end of the first capacitor (C1), the other end of the varistor (RV 1) being further connected to the other end of the first capacitor (C1), one end of the first capacitor (C1) being connected to one end of the second capacitor (C2), the other end of the first capacitor (C1) being further connected to one end of the third capacitor (C3), the other end of the third capacitor (C3) being further connected to the first end of the load connection module (DC/DC end of the second capacitor (C1), one end of the varistor (AC 1) being further connected to one end of the first capacitor (C1), the other end of the varistor (AC 1) being connected to one end of the second capacitor (C2), the other end of the third capacitor (C3) and the other end of the second capacitor (C2) are grounded.
4. An electrical fire monitoring detector circuit according to claim 3, characterized in that the DC/DC circuit comprises a first diode (D1), a first inductance (L1), a voltage regulator chip (P1), a fourth capacitance (C4), a fifth capacitance (C5), a sixth capacitance (C6), a seventh capacitance (C7), an eighth capacitance (C8); one end of a fourth capacitor (C4) is connected to the VCC output end of the AC/DC module, the other end of the fourth capacitor (C4) is connected to the GND end of the AC/DC module, one end of the fourth capacitor (C4) is further connected with the negative electrode of a first diode (D1), the negative electrode of the first diode (D1) is further connected to the first port of a first inductor (L1), the second port of the first inductor (L1) is connected to one end of a fifth capacitor (C5), the third port of the first inductor (L1) is connected to one end of a sixth capacitor (C6), one end of the sixth capacitor (C6) is further connected with a +5V power supply, one end of a seventh capacitor (C7) is further connected to one end of a voltage stabilizing chip (P1), the output end of the voltage stabilizing chip (P1) is then connected with the eighth capacitor (C8), the other end of the eighth capacitor (C8) is further connected with the other end of the fourth capacitor (C6), and the other end of the eighth capacitor (C7) is further connected with the other end of the fourth capacitor (C1), and the other end of the eighth capacitor (C6) is further connected with the other end of the fourth capacitor (C1).
5. An electrical fire monitoring detector circuit according to claim 4, wherein the signal acquisition unit comprises a current transformer, at least one isolation protection circuit and a current sampling module connected to the isolation protection circuit; the isolation protection circuit comprises a third resistor (R3), a third optocoupler (UP 3), a first resistor (R1), a second resistor (R2), a ninth capacitor (C9) and a first clamping diode (DS 1); the current transformer samples residual current and overcurrent which are connected to a load circuit and is connected to one end of a third resistor (R3), the other end of the third resistor (R3) is connected to the second end of a third optocoupler (UP 3), the first end of the third optocoupler (UP 3) is connected to a VDD power supply, the fourth end of the third optocoupler (UP 3) is connected to a VCC power supply, the third end of the third optocoupler (UP 3) is connected to one end of a first resistor (R1), the other end of the first resistor (R1) is connected to one end of a second resistor (R2), one end of the second resistor (R2) is connected to one end of a ninth capacitor (C9), the other end of the second resistor (R2) is connected to the other end of a ninth capacitor (C9), one end of the ninth capacitor (C9) is connected to one end of a first clamping diode (DS 1), and the other end of the ninth capacitor (C9) is connected to the other end of the first clamping diode (DS 1). Two ends of the first clamping diode (DS 1) are connected to the current sampling module.
6. An electrical fire monitoring detector circuit according to claim 5, wherein the current sampling module comprises a first operational amplifier (US 1), a second operational amplifier (US 2), a fourth resistor (R5), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and a tenth capacitor (C10); one end of the first clamping diode (DS 1) is connected to the non-inverting input end of the second operational amplifier (US 2), the other end of the first clamping diode (DS 1) is connected to one end of a seventh resistor (R7), the other end of the seventh resistor (R7) is connected to the inverting input end of the second operational amplifier (US 2), one end of the seventh resistor (R7) is further connected to one end of a sixth resistor (R6), one end of the sixth resistor (R6) is further connected to the other end of a tenth capacitor (C10), the inverting input end of the second operational amplifier (US 2) is further connected to one end of a fifth resistor (R5), the other end of the fifth resistor (R5) is further connected to the output end of the second operational amplifier (US 2), the output end of the second operational amplifier (US 2) is further connected to the non-inverting input end of the first operational amplifier (US 1), the other end of the sixth resistor (R6) is further connected to the inverting input end of the first operational amplifier (US 1), the inverting input end of the second operational amplifier (US 1) is further connected to the inverting input end of the fourth operational amplifier (US 1), and the inverting input end of the fourth operational amplifier (US 1) is further connected to the inverting input end of the fourth operational amplifier (US 1).
7. An electrical fire monitoring detector circuit as defined in claim 6 wherein: the central processing unit module adopts a 24FJ32GA002 singlechip, which is a 16bit singlechip of PIC24 series, and is provided with 16 programmable I/O ports, program Flash Memory 32KB and RAMsize8K; the man-machine conversation unit is provided with a display for detecting current operation parameters of a controlled loop in real time, a keyboard for realizing an input function of man-machine conversation, an LED indicator lamp for indicating the operation state of the electric fire monitoring and detecting device and a buzzer for prompting the alarm state of the electric fire monitoring and detecting device.
8. The circuit of claim 7, wherein the receive processing circuit comprises a second diode (D2), a third diode (D3), a fourth diode (D4), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), an eleventh capacitor (C11), a twelfth capacitor (C12), a thirteenth capacitor (C13), a fourteenth capacitor (C14), a fifteenth capacitor (C15), a fourth optocoupler (UP 4), a fifth optocoupler (UP 5), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), a sixteenth resistor (R16), a seventeenth resistor (R17), an eighteenth resistor (R18), a nineteenth resistor (R19), a twentieth resistor (R20), a twenty-first resistor (R21), a first triode (Q1), a second triode (Q2), and a third triode (Q3); the positive electrode of the second diode (D2) is connected with a VL+ power supply, the other end of the eleventh capacitor (C11) is connected with a VL-power supply, the negative electrode of the second diode (D2) is connected with one end of a thirteenth capacitor (R13), the other end of the thirteenth resistor (R13) is connected with one end of the eleventh capacitor (C11), the other end of the thirteenth resistor (R13) is connected with one end of a fourteenth resistor (R14), one end of the fourteenth resistor (R14) is further connected with a collector of a first triode (Q1), the other end of the fourteenth resistor (R14) is further connected with a base of a first triode (Q1), the other end of the fourteenth resistor (R14) is further connected with one end of a twelfth capacitor (C12), the base of the first triode (Q1) is further connected with the negative electrode of a third diode (D3), the other end of the twelfth capacitor (C12) is further connected with the other end of the eleventh capacitor (C11) and one end of the third diode (D3), one end of the thirteenth resistor (R1) is further connected with the emitter of the thirteenth capacitor (C3), the other end of the thirteenth resistor (C1) is further connected with the thirteenth diode (C1), the other end of the thirteenth resistor (C3) is further connected with the emitter of the thirteenth resistor (C1), the other end of the fifteenth resistor (R15) is connected to the positive electrode of a sixth diode (D6), the negative electrode of the sixth diode (D6) is connected to the base electrode of a third triode (Q3), one end of the fifteenth resistor (R15) is also connected to the positive electrode of a fourth diode (D4), the negative electrode of the fourth diode (D4) is connected to the negative electrode of a fifth diode (D5), the negative electrode of the fifth diode (D5) is connected to one end of a sixteenth resistor (R16), the other end of the sixteenth resistor (R16) is connected to a VL-power supply, the positive electrode of the fifth diode (D5) is connected to the other end of a seventeenth resistor (R17), the other end of the seventeenth resistor (R17) is also connected to the base electrode of a second triode (Q2), the emitter of the second triode (Q2) is also connected to one end of the seventeenth resistor (R17), the negative electrode of the second triode (Q2) is connected to the negative electrode of a nineteenth resistor (R19), the other end of the nineteenth resistor (Q4) is connected to the other end of the seventeenth resistor (R19), the other end of the seventeenth resistor (R4) is connected to the other end of the seventeenth resistor (R18), and the seventeenth resistor (R7) is connected to the other end of the seventeenth resistor (R4) is connected to the other end of the seventeenth resistor (R7), the emitter of the third triode (Q3) is connected to the first end of a fifth optocoupler (UP 5), the other end of the thirteenth capacitor (C13) is also connected to the positive electrode of a seventh diode (D7), and the positive electrodes of the seventh diode (D7) are connected to the second end of the fifth optocoupler (UP 5); the fourth end of the fourth optocoupler (UP 4) is connected with one end of a twentieth resistor (R20), the other end of the twentieth resistor (R20) is connected with a VDD power supply, one end of the twentieth resistor (R20) is also connected with one end of a fourteenth capacitor (C14), the other end of the fourteenth capacitor (C14) and the third end of the fourth optocoupler (UP 4) are grounded, and one end of the fourteenth capacitor (C14) is also connected with the central processing operation unit module; the fourth end of the fifth optocoupler (UP 5) is connected with a VDD power supply, the third end of the fifth optocoupler (UP 5) is connected with one end of a twenty-first resistor (R21), one end of the twenty-first resistor (R21) is also connected with one end of a fifteenth capacitor (C15), and the other end of the fifteenth capacitor (C15) and the other end of the twenty-first resistor (R21) are grounded; one end of the fifteenth capacitor (C15) is also connected to the central processing unit module.
9. An electrical fire monitoring detector circuit according to claim 8, characterized in that the signal transmission circuit comprises a first optocoupler (UP 1), a second optocoupler (UP 2), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11) for isolating the VL supply from the VDD supply in the communication module; the first end of the first optocoupler (UP 1) is connected with one end of an eighth resistor (R8), the other end of the eighth resistor (R8) is connected with a VDD power supply, the second end of the first optocoupler (UP 1) and the second end of the second optocoupler (UP 2) are both connected to a central processing operation unit module, the third end of the first optocoupler (UP 1) and the third end of the second optocoupler (UP 2) are both connected with a VL-power supply, the first end of the second optocoupler (UP 2) is connected with one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with a VDD power supply, the fourth end of the first optocoupler (UP 1) is connected with one end of a tenth resistor (R10), the other end of the tenth resistor (R10) is connected with one end of an eleventh resistor (R11), one end of the eleventh resistor (R11) is also connected with a VL-power supply, and the other end of the eleventh resistor (R11) is connected with the fourth end of the second optocoupler (UP 2).
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| CN202311559091.8A CN117496680A (en) | 2017-07-25 | 2017-07-25 | Electric fire monitoring detector circuit |
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| CN202311559091.8A CN117496680A (en) | 2017-07-25 | 2017-07-25 | Electric fire monitoring detector circuit |
| CN201710611435.3A CN107290630A (en) | 2017-07-25 | 2017-07-25 | Detector for electric fire protection circuit |
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| CN109541361B (en) * | 2018-12-28 | 2024-07-12 | 深圳供电局有限公司 | Public transformer low-voltage side branch load heavy-load early warning device and method |
| CN112180148B (en) * | 2019-07-05 | 2024-06-18 | 上海赋锦信息技术股份有限公司 | Electrical appliance fire detection system and detection method |
| CN110824220A (en) * | 2019-11-05 | 2020-02-21 | 上海置信电气股份有限公司 | Novel signal acquisition circuit of electronic sensor |
| CN112865012A (en) * | 2021-03-01 | 2021-05-28 | 合肥依科普工业设备有限公司 | Electric arc fire protection system |
| CN115311810B (en) * | 2022-08-05 | 2023-08-04 | 扎赉诺尔煤业有限责任公司 | Infrared ray fire source early warning detecting system |
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| CN207007986U (en) * | 2017-07-25 | 2018-02-13 | 浙江爱德智能科技股份有限公司 | Detector for electric fire protection circuit |
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