CN207007986U - Detector for electric fire protection circuit - Google Patents

Abstract

The utility model discloses detector for electric fire protection circuit, including power module, control output module, central processing arithmetic element module, signal gathering unit, human-computer dialogue unit and communication module, the residual current and overcurrent in loaded line are gathered by signal gathering unit, the processing of central processing arithmetic element module analysis is sent into after amplification filtering process of going forward side by side, and judge whether the current information of detection is abnormal, and the real time fail current information and early warning, alarm, control information for realizing electrical fire-detector are shown；And LED light and buzzer are provided with, ensures the function of sound and light alarm.

Description

Detector for electric fire protection circuit

Technical field

It the utility model is related to detector field, and in particular to detector for electric fire protection circuit.

Background technology

Background of related of the present utility model is illustrated below, but these explanations might not form this practicality newly The prior art of type.

Electrical fire monitoring device by a computer as master control upper computer, coordinate fire-proof leakage warning system terminal, Residual current detector and some breakers with shunted exciter tripping function, master control upper computer is connected to by two lines bus, by answering A complete fire-proof leakage warning system is formed with software；Main control computer has inspection, monitoring, audible alarm, printing and inquiry The multiple functions such as system, complete intelligentized management；The system uses collecting and distributing control program, and a microcomputer can monitor 512 fireproof electricity-leakage system terminals；Fireproof electricity-leakage system terminal can work independently, and can check use by system terminal scene The parameters of electricity.

But existing electrical fire monitoring device can be furnished with gas sensor for the sensing to toxic and harmful gas, match somebody with somebody There is Smoke Sensor to sense to producing smog, the speed of temperature value and temperature change is felt equipped with temperature sensor Should, it is not detected to the equipment of itself, once electrical fire monitoring device itself fail, is easy for reporting by mistake Or failing to report phenomenon, cause fire to report or occur fire by mistake and do not alarm but, heavy losses occur.

Utility model content

The purpose of this utility model is to provide detector for electric fire protection circuit, is arranged on electrical fire monitoring device In, for being detected to the equipment of itself, prevent unexpected cause damage.

In order to solve the above technical problems, the utility model is achieved through the following technical solutions：Detector for electric fire protection Circuit, including：

Power module, it is connected to loaded line and central processing arithmetic element module, letter will be supplied to after its Power convert Number collecting unit, human-computer dialogue unit and communication module electricity consumption；

Signal gathering unit, the current signal of loaded line is gathered by current transformer, then by isolation, amplification and filter Connected central processing arithmetic element module is sent into ripple processing；

Central processing arithmetic element module, the information of reception signal collecting unit module transfer and analyzed and processed and Judge, realize the real time fail current information of electrical fire-detector and early warning, alarm, control information are shown and sound and light alarm work( Energy；

Communication module, by the data transfer of central processing arithmetic element module to monitoring device, failure is found for realizing And alarm；

Human-computer dialogue unit, central processing arithmetic element module is connected to, for facilitating user to be directly viewable fire hazard monitoring Detector running status and progress parameter setting；

Output module is controlled, is arranged on shunt release and central processing computing list with the switch connection on loaded line Between element module, for exporting alarm and protection signal and dropout output signal, connected shunt release action control is driven Switch on loaded line processed.

Preferably, the power module includes load link block, protection filter circuit, AC/DC modules and DC/DC electricity Road；Second and third end of the load link block is connected to protection filter circuit, and the first end of the load link block then connects Ground wire is connected to, the protection filter circuit is then connected to the ac input end of AC/DC modules, the output end of the AC/DC modules Then it is connected to DC/DC circuits and is used for conversion electric power.

Preferably, the protection filter circuit includes fuse, piezo-resistance, thermistor, the first electric capacity, the second electric capacity With the 3rd electric capacity, one end of the fuse is connected to the 3rd end of load link block, the other end connection of the fuse To one end of piezo-resistance, the other end of the piezo-resistance is connected to the second end of load link block, the piezo-resistance One end be additionally coupled to one end of the first electric capacity, the other end of the piezo-resistance is additionally coupled to the other end of the first electric capacity, institute The one end for stating the first electric capacity connects one end of the second electric capacity, and the other end of first electric capacity is additionally coupled to the one of the 3rd electric capacity End, one end of the 3rd electric capacity are additionally coupled to the second ac input end of AC/DC modules, and one end of second electric capacity also connects One end of thermistor is connected to, the other end of the thermistor is then connected to the first ac input end of AC/DC modules, described First end, the other end of the 3rd electric capacity and the other end of the second electric capacity of load link block are all grounded.

Preferably, the DC/DC circuits include the first diode, the first inductance, voltage stabilizing chip, the 4th electric capacity, the 5th electricity Appearance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity；One end of 4th electric capacity is connected to the VCC output ends of AC/DC modules, institute The other end for stating the 4th electric capacity is then connected to the GND ends of AC/DC modules, and one end of the 4th electric capacity is also connected with the first diode Negative pole, the negative pole of first diode is additionally coupled to the first port of the first inductance, the second port of first inductance Then it is connected to one end of the 5th electric capacity, the 3rd port of first inductance is then connected to one end of the 6th electric capacity, and the described 6th One end of electric capacity is also associated with+5V power supplys, and one end of the 6th electric capacity is also connected with one end of the 7th electric capacity, the 7th electric capacity One end be additionally coupled to the input of voltage stabilizing chip, the output end of the voltage stabilizing chip then connects one end of the 8th electric capacity, described One end of 8th electric capacity is additionally coupled to VDD power supplys, the other end of the 4th electric capacity, positive pole, the 5th electric capacity of the first diode The other end, the other end of the 6th electric capacity, the other end of the 7th electric capacity, the other end of the GND ends of voltage stabilizing chip and the 8th electric capacity All meet GND.

Preferably, the signal gathering unit includes current transformer, at least one isolation protective circuit and protected with isolating The current sample module of protection circuit connection；The isolation protective circuit includes 3rd resistor, the 3rd optocoupler, first resistor, second Resistance, the 9th electric capacity, the first clamp diode；The current transformer sampling is connected to loaded line and samples its residual current And overcurrent, and one end of 3rd resistor is connected to, the other end of the 3rd resistor is then connected to the second end of the 3rd optocoupler, The first end of 3rd optocoupler then connects VDD power supplys, and the 4th end of the 3rd optocoupler then connects VCC power supplys, and the described 3rd 3rd end of optocoupler then connects one end of first resistor, and the other end of the first resistor then connects one end of second resistance, institute The one end for stating second resistance is also connected with one end of the 9th electric capacity, and the other end of the second resistance is additionally coupled to the another of the 9th electric capacity One end, one end of the 9th electric capacity are additionally coupled to one end of the first clamp diode, and the other end of the 9th electric capacity then connects It is connected to the other end of the first clamp diode；The both ends of first clamp diode are then connected to current sample module.

Preferably, the current sample module includes the first amplifier, the second amplifier, the 4th resistance, the 5th resistance, the 6th electricity Resistance, the 7th resistance and the tenth electric capacity；One end of first clamp diode is connected to the in-phase input end of the second amplifier, described The other end of first clamp diode is then connected to one end of the 7th resistance, and the other end of the 7th resistance is then connected to second The inverting input of amplifier, one end of the 7th resistance are additionally coupled to one end of the 6th resistance, one end of the 6th resistance It is additionally coupled to the other end of the tenth electric capacity, the inverting input of second amplifier is also connected with one end of the 5th resistance, and described The other end of five resistance is additionally coupled to the output end of the second amplifier, and the output end of second amplifier is connected to the same of the first amplifier Phase input, the other end of the 6th resistance are additionally coupled to the inverting input of the first amplifier, first amplifier it is anti-phase Input is also connected with one end of the 4th resistance, and the other end of the 4th resistance is connected to the output end of the first amplifier, and described The output end of one amplifier is connected to one end of the tenth electric capacity, and one end of the tenth electric capacity is additionally coupled to central processing arithmetic element Module.

Preferably, the central processing arithmetic element module uses 24FJ32GA002 single-chip microcomputers, and it is PIC24 series 16bit single-chip microcomputers, there are 16 programmable I/O mouths, Program Flash Memory 32KB, RAMsize8K；It is described man-machine Dialog unit sets display to be used to detect controlled loop current operational factor in real time, also sets up keyboard and is used to realize human-computer dialogue Input function, also set up LED light and be used to indicate electrical fire monitoring detection device running status, set buzzer to be used for Prompt electrical fire monitoring detection device alarm condition.

Preferably, the communication module includes signal sending circuit, receiving processing circuit and anti-surge protection circuit；It is described Anti-surge protection circuit includes host computer link block, two-way surge diode, the 12nd resistance, rectifier bridge；The host computer Link block connects one end of the 12nd resistance by the first communication bus, and the host computer link block is total by the second communication Line is connected to the other end of two-way surge diode, and one end of the 12nd resistance connects one end of two-way surge diode； One end of the two-way surge diode is additionally coupled to the first input end of rectifier bridge, and its other end is then connected to the of rectifier bridge Two inputs, the 3rd output end of the rectifier bridge then connect VL- power supplys, and the 4th output end of the rectifier bridge then connects VL+ Power supply.

Preferably, the receiving processing circuit includes the second diode, the 3rd diode, the 4th diode, the five or two pole Pipe, the 6th diode, the 7th diode, the 11st electric capacity, the 12nd electric capacity, the 13rd electric capacity, the 14th electric capacity, the 15th electricity Appearance, the 4th optocoupler, the 5th optocoupler, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, 18th resistance, the 19th resistance, the 20th resistance, the 21st resistance, the first triode, the second triode, the three or three pole Pipe；The positive pole connection VL+ power supplys of second diode, the other end connection VL- power supplys of the 11st electric capacity, described second The negative pole of diode is then connected to one end of the 13rd resistance, and the other end of the 13rd resistance then connects the 11st electric capacity One end, the other end of the 13rd resistance are connected to one end of the 14th resistance, and one end of the 14th resistance is also connected with To the colelctor electrode of the first triode, the other end of the 14th resistance then connects the base stage of the first triode, and the described 14th The other end of resistance is also connected with one end of the 12nd electric capacity, and the base stage of first triode is additionally coupled to the negative of the 3rd diode Pole, the other end of the 12nd electric capacity are further connected to the positive pole of the other end and the 3rd diode of the 11st electric capacity, institute The positive pole for stating the 3rd diode is additionally coupled to the other end of the 13rd electric capacity, and one end of the 13rd electric capacity is additionally coupled to first The emitter stage of triode, the emitter stage of first triode are additionally coupled to one end of the 17th resistance, second diode Positive pole be additionally coupled to one end of the 15th resistance, the other end of the 15th resistance is then being connected to the 6th diode just Pole, the negative pole of the 6th diode are then connected to the base stage of the 3rd triode, and one end of the 15th resistance is additionally coupled to The positive pole of 4th diode, the negative pole of the 4th diode connect the negative pole of the 5th diode, and the 5th diode is born Pole then connects one end of the 16th resistance, and the other end of the 16th resistance then connects VL- power supplys, and the 5th diode is just Pole then connects the other end of the 17th resistance, and the other end of the 17th resistance is additionally coupled to the base stage of the second triode, institute The emitter stage for stating the second triode is also connected with one end of the 17th resistance, and the colelctor electrode of second triode is then connected to the tenth One end of nine resistance, the other end of the 19th resistance then connect the first end of the 4th optocoupler, the collection of the 3rd triode Electrode connects one end of the 18th resistance, and the other end of the 18th resistance then connects the negative pole of the 7th diode, and described the The negative pole of seven diodes is additionally coupled to the second end of the 4th optocoupler, and the emitter stage of the 3rd triode is connected to the 5th optocoupler First end, the other end of the 13rd electric capacity are additionally coupled to the positive pole of the 7th diode, the positive pole to the 7th diode It is connected to the second end of the 5th optocoupler；4th end of the 4th optocoupler then connects one end of the 20th resistance, and the described 20th Another termination VDD power supplys of resistance, one end of the 20th resistance are also connected with one end of the 14th electric capacity, the 14th electricity 3rd end of the other end of appearance and the 4th optocoupler is all grounded, and one end of the 14th electric capacity is additionally coupled to central processing computing list Element module；The 4th end connection VDD power supplys of 5th optocoupler, the 3rd end of the 5th optocoupler are then connected to the 21st electricity One end of resistance, one end of the 21st resistance are also connected with one end of the 15th electric capacity, the other end of the 15th electric capacity All it is grounded with the other end of the 21st resistance；One end of 15th electric capacity is additionally coupled to central processing arithmetic element mould Block.

Preferably, the signal sending circuit includes the first optocoupler, the second optocoupler, the 8th resistance, the 9th resistance, the tenth electricity Resistance, the 11st resistance, it is used for the VL power supplys and VDD isolated from power in communication module；The first end of first optocoupler connects Connect one end of the 8th resistance, another termination VDD power supplys of the 8th resistance, the second end of first optocoupler and the second optocoupler The second end be connected to central processing arithmetic element module, the 3rd end of first optocoupler and the 3rd end of the second optocoupler are all VL- power supplys are connect, the first end of second optocoupler connects one end of the 9th resistance, another termination VDD electricity of the 9th resistance Source, the 4th end of first optocoupler connect one end of the tenth resistance, and the other end of the tenth resistance connects the 11st resistance One end, one end of the 11st resistance is also connected with VL+ power supplys, and the other end of the 11st resistance is connected to the second optocoupler The 4th end.

The utility model gathers residual current and overcurrent in loaded line, amplification of going forward side by side by signal gathering unit The processing of central processing arithmetic element module analysis is sent into after filtering process, and judges whether the current information of detection is abnormal, realizes The real time fail current information of electrical fire-detector and early warning, alarm, control information are shown；And it is provided with LED light And buzzer, ensure the function of sound and light alarm.

Compared with prior art, it is of the present utility model to be beneficial in that：1）Signal gathering unit sampling loaded line Residual current and overcurrent, and take the accuracy of data by amplification filtering process, reinforcement；2）Central processing arithmetic element mould Block is judged, analyzed and handled to the data message for detecting and receiving, and realizes the real time fail electricity of electrical fire-detector Stream information and early warning, alarm, control information are shown；3）Control output is used to export alarm and protection signal and dropout output signal, The switch on connected shunt release action control loaded line is driven, increases its security；4）Communication module passes through Arc signal real-time data transmission is ensured the promptness of its alarm by two lines bus communication modes.

Brief description of the drawings

By that will become and the specific embodiment part provided, feature and advantage of the present utility model referring to the drawings It is easier to understand, in the accompanying drawings.

Fig. 1 is the schematic diagram of detector for electric fire protection circuit of the present utility model.

Fig. 2 is the schematic diagram of power module of the present utility model.

Fig. 3 is the schematic diagram of the isolation protective circuit in signal gathering unit of the present utility model.

Fig. 4 is the schematic diagram of the current sample module in signal gathering unit of the present utility model.

Fig. 5 is the schematic diagram of the signal sending circuit in communication module of the present utility model.

Fig. 6 is the schematic diagram of the receiving processing circuit in communication module of the present utility model.

Embodiment

Illustrative embodiments of the present utility model are described in detail with reference to the accompanying drawings；To illustrative embodiments Description merely for the sake of demonstration purpose, and be definitely not to the utility model and its application or the limitation of usage.

In present embodiment, power module is AC220V/DC5V circuits, and the load electricity consumption in loaded line is passed through guarantor by it Dangerous silk RF1, piezo-resistance RV1, thermistor NTC, the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3 compositions protection are filtered After the protection filtering of wave circuit, enter back into AC/DC modules and the AC220V alternating currents for loading electricity consumption are converted into DC5V power supplys, DC5V Power supply is used to be supplied to collecting unit electricity consumption, and DC5V power supplys are also needed by the first diode D1, the first inductance L1, voltage stabilizing chip P1, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the DC/DC circuits of the 8th electric capacity C8 compositions, will DC5V Power converts are that DC3.3V power supplys are used for central processing arithmetic element module, human-computer dialogue unit and communication module power supply.

In present embodiment, signal gathering unit sampled respectively by current transformer residual current in loaded line and Overcurrent, the current information that current transformer collects pass through the 3rd optocoupler UP3, first resistor R1, second resistance R2, the 3rd electricity Current sample module, electricity are sent into the processing for hindering the isolation protective circuit that R3, the 9th electric capacity C9, the first clamp diode DS1 are formed Flowing sampling module includes the 5th resistance R5, the 7th resistance R7, the operational amplification circuit and the first amplifier of the second amplifier US2 compositions US1, the 4th resistance R4, the filtering and amplifying circuit of the tenth electric capacity C10 compositions, the current information after isolation protective circuit is handled Filtering and amplifying circuit is entered back into after operational amplification circuit carries out signal amplification and is amplified filtering process, in being then re-fed into Centre processing arithmetic element module is analyzed and processed.

In present embodiment, second resistance R2 is sampling resistor, and two isolation protective circuits and two are provided with circuit Current sample module.

In present embodiment, 24FJ32GA002 single-chip microcomputers are used in central processing arithmetic element module, it is PIC24 systems The 16bit single-chip microcomputers of row, there are 16 programmable I/O mouths, Program Flash Memory 32KB, RAMsize8K；Monolithic The information for detecting and receiving is judged, analyzed and handled by machine, realizes the real time fail electric current letter of electrical fire-detector Breath and early warning, alarm, control information are shown and sound and light of alarm；Single-chip microcomputer is received after signal gathering unit gathers and handle Current information, judge whether electric current abnormal, if any exception, then send audible and visible alarm, control outputting cutting deenergizing, failure is believed Breath is transferred to host computer.

In present embodiment, the human-computer dialogue unit being connected with central processing arithmetic element module is set to be used to facilitate user Detector for electric fire protection running status is checked clear and intuitively and carries out parameter setting, and system is provided with LCD Chinese liquid entirely Crystal display, monitoring controlled loop current operational factor in real time can be realized；Keyboard is set to complete well interactive defeated Enter function；LED light is set to indicate detector for electric fire protection running status；Buzzer is set to prompt electrical fire detection Device alarm condition；When there is alarm, detector for electric fire protection sends fire alarm acoustical signal and reminds staff timely Solution is handled, and this signal can be eliminated manually, and when there is alarm signal input again, fire alarm acoustical signal can be again started up, and be given Keep, until electrical fire monitoring detection device resets.

In present embodiment, when sampling fault current information more than the value set in central processing arithmetic element module, The control being arranged between the shunt release of the switch connection on loaded line and central processing arithmetic element module exports Module exports alarm and protection signal and dropout output signal, drives connected shunt release to act so that loaded line On switch disengage；Described to control output module be switching mode relay, and contact capacity is 250V AC/5A.

In present embodiment, communication module is passed the data such as arc signal by customized two lines bus communication modes in real time It is sent to electrical fire monitoring device；Fault current is such as found that, achievable and alarm；Host computer connects host computer link block J2,0V, 24V level controling signal are sent by the communication communications of the first communication bus L1 and second L2, control signal is by receiving Central processing arithmetic element module analysis is re-fed into after process circuit to handle for controlling monitoring detector.

In present embodiment, central processing arithmetic element module sends data-signal and sent by the signal in communication module Processing of circuit, in a manner of electric current and upper machine communication.

In present embodiment, the anti-surge protection circuit in communication module carries out wave resistance by two-way surge diode TVS1 Protection is gushed, and the first optocoupler UP1, the second optocoupler UP2, the 3rd optocoupler UP3, the 3rd optocoupler UP4 structures are provided with communication module Into light-coupled isolation, and host computer is by sending the second communication communication L224V level controling signals, the communication of 24V high-voltage levels Mode make it that detector and host communication are stable, and anti-electromagnetic interference capability is strong.

Although the utility model is described with reference to illustrative embodiments, but it is to be understood that the utility model The embodiment be described in detail and shown in text is not limited to, in the feelings without departing from claims limited range Under condition, those skilled in the art can make various changes, the scope of protection of the utility model to the illustrative embodiments It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, is improved by claims Fall into the scope of protection of the utility model.

Claims (10)

1. detector for electric fire protection circuit, it is characterised in that：

Power module, it is connected to loaded line and central processing arithmetic element module, signal will be supplied to adopt after its Power convert Collect unit, human-computer dialogue unit and communication module electricity consumption；

Signal gathering unit, the current signal of loaded line is gathered by current transformer, then by isolating, at amplification and filtering Reason is sent into connected central processing arithmetic element module；

Central processing arithmetic element module, the information of reception signal collecting unit module transfer are simultaneously analyzed and processed and sentenced It is disconnected, realize the real time fail current information of electrical fire-detector and early warning, alarm, control information are shown and sound and light alarm work( Energy；

Communication module, by the data transfer of central processing arithmetic element module to monitoring device, for realize find failure and Alarm；

Human-computer dialogue unit, central processing arithmetic element module is connected to, for facilitating user to be directly viewable fire hazard monitoring detection Device running status and progress parameter setting；

Output module is controlled, is arranged on shunt release and central processing arithmetic element mould with the switch connection on loaded line Between block, for exporting alarm and protection signal and dropout output signal, connected shunt release action control is driven to bear Carry the switch on circuit.

2. circuit according to claim 1, it is characterised in that：The power module includes load link block（J1）, protect Protect filter circuit, AC/DC modules and DC/DC circuits；The load link block（J1）Second and third end be connected to protection filtering Circuit, the load link block（J1）First end be then connected to ground wire, the protection filter circuit is then connected to AC/DC moulds The ac input end of block, the output end of the AC/DC modules are then connected to DC/DC circuits and are used for conversion electric power.

3. circuit according to claim 2, it is characterised in that：The protection filter circuit includes fuse（RF1）, it is pressure-sensitive Resistance（RV1）, thermistor（NTC）, the first electric capacity（C1）, the second electric capacity（C2）With the 3rd electric capacity（C3）, the fuse （RF1）One end be connected to load link block（J1）The 3rd end, the fuse（RF1）The other end be connected to pressure-sensitive electricity Resistance（RV1）One end, the piezo-resistance（RV1）The other end be connected to load link block（J1）The second end, the pressure Quick resistance（RV1）One end be additionally coupled to the first electric capacity（C1）One end, the piezo-resistance（RV1）The other end be additionally coupled to First electric capacity（C1）The other end, first electric capacity（C1）One end connect the second electric capacity（C2）One end, it is described first electricity Hold（C1）The other end be additionally coupled to the 3rd electric capacity（C3）One end, the 3rd electric capacity（C3）One end be additionally coupled to AC/DC Second ac input end of module, second electric capacity（C2）One end be additionally coupled to thermistor（NTC）One end, the heat Quick resistance（NTC）The other end be then connected to the first ac input end of AC/DC modules, the load link block（J1） One end, the 3rd electric capacity（C3）The other end and the second electric capacity（C2）The other end be all grounded.

4. circuit according to claim 3, it is characterised in that：The DC/DC circuits include the first diode（D1）, first Inductance（L1）, voltage stabilizing chip（P1）, the 4th electric capacity（C4）, the 5th electric capacity（C5）, the 6th electric capacity（C6）, the 7th electric capacity（C7）, Eight electric capacity（C8）；4th electric capacity（C4）One end be connected to the VCC output ends of AC/DC modules, the 4th electric capacity（C4） The other end be then connected to the GND ends of AC/DC modules, the 4th electric capacity（C4）One end be also connected with the first diode（D1）'s Negative pole, first diode（D1）Negative pole be additionally coupled to the first inductance（L1）First port, first inductance（L1） Second port be then connected to the 5th electric capacity（C5）One end, first inductance（L1）The 3rd port be then connected to the 6th electricity Hold（C6）One end, the 6th electric capacity（C6）One end be also associated with+5V power supplys, the 6th electric capacity（C6）One end also connect Connect the 7th electric capacity（C7）One end, the 7th electric capacity（C7）One end be additionally coupled to voltage stabilizing chip（P1）Input, it is described Voltage stabilizing chip（P1）Output end then connect the 8th electric capacity（C8）One end, the 8th electric capacity（C8）One end be additionally coupled to VDD power supplys, the 4th electric capacity（C4）The other end, the first diode（D1）Positive pole, the 5th electric capacity（C5）The other end, Six electric capacity（C6）The other end, the 7th electric capacity（C7）The other end, voltage stabilizing chip（P1）GND ends and the 8th electric capacity（C8）It is another One end all meets GND.

5. circuit according to claim 4, it is characterised in that：The signal gathering unit includes current transformer, at least One isolation protective circuit and the current sample module being connected with isolation protective circuit；The isolation protective circuit includes the 3rd electricity Resistance（R3）, the 3rd optocoupler（UP3）, first resistor（R1）, second resistance（R2）, the 9th electric capacity（C9）, the first clamp diode （DS1）；The current transformer sampling is connected to loaded line and samples its residual current and overcurrent, and is connected to the 3rd electricity Resistance（R3）One end, the 3rd resistor（R3）The other end be then connected to the 3rd optocoupler（UP3）The second end, the 3rd light Coupling（UP3）First end then connect VDD power supplys, the 3rd optocoupler（UP3）The 4th end then connect VCC power supplys, the described 3rd Optocoupler（UP3）The 3rd end then connect first resistor（R1）One end, the first resistor（R1）The other end then connect second Resistance（R2）One end, the second resistance（R2）One end be also connected with the 9th electric capacity（C9）One end, the second resistance （R2）The other end be additionally coupled to the 9th electric capacity（C9）The other end, the 9th electric capacity（C9）One end be additionally coupled to the first pincers Position diode（DS1）One end, the 9th electric capacity（C9）The other end be then connected to the first clamp diode（DS1）It is another End；First clamp diode（DS1）Both ends be then connected to current sample module.

6. circuit according to claim 5, it is characterised in that：The current sample module includes the first amplifier（US1）, Two amplifiers（US2）, the 4th resistance（R5）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th resistance（R7）With the tenth electric capacity （C10）；First clamp diode（DS1）One end be connected to the second amplifier（US2）In-phase input end, it is described first pincers Position diode（DS1）The other end be then connected to the 7th resistance（R7）One end, the 7th resistance（R7）The other end then connect It is connected to the second amplifier（US2）Inverting input, the 7th resistance（R7）One end be additionally coupled to the 6th resistance（R6）One End, the 6th resistance（R6）One end be additionally coupled to the tenth electric capacity（C10）The other end, second amplifier（US2）It is anti- Phase input is also connected with the 5th resistance（R5）One end, the 5th resistance（R5）The other end be additionally coupled to the second amplifier （US2）Output end, second amplifier（US2）Output end be connected to the first amplifier（US1）In-phase input end, described Six resistance（R6）The other end be additionally coupled to the first amplifier（US1）Inverting input, first amplifier（US1）It is anti-phase defeated Enter end and be also connected with the 4th resistance（R4）One end, the 4th resistance（R4）The other end be connected to the first amplifier（US1）It is defeated Go out end, first amplifier（US1）Output end be connected to the tenth electric capacity（C10）One end, the tenth electric capacity（C10）One End is additionally coupled to central processing arithmetic element module.

7. circuit according to claim 6, it is characterised in that：The central processing arithmetic element module uses 24FJ32GA002 single-chip microcomputers, it is the 16bit single-chip microcomputers of PIC24 series, there is 16 programmable I/O mouths, Program Flash Memory 32KB, RAMsize8K；The human-computer dialogue unit sets display to be used to detect controlled loop current operation in real time Parameter, also set up keyboard and be used to realize interactive input function, also set up LED light and be used to indicate electrical fire monitoring Detection device running status, buzzer is set to be used to prompt electrical fire monitoring detection device alarm condition.

8. circuit according to claim 7, it is characterised in that：The communication module includes signal sending circuit, transmission connects Receive process circuit and anti-surge protection circuit；The anti-surge protection circuit includes host computer link block（J2）, two-way surge Diode（TVS1）, the 12nd resistance（R12）, rectifier bridge（DD1）；The host computer link block（J2）It is total by the first communication Line（L1）Connect the 12nd resistance（R12）One end, the host computer link block（J2）Pass through the second communication bus（L2）Even It is connected to two-way surge diode（TVS1）The other end, the 12nd resistance（R12）One end connect two-way surge diode （TVS1）One end；The two-way surge diode（TVS1）One end be additionally coupled to rectifier bridge（DD1）First input end, its The other end is then connected to rectifier bridge（DD1）The second input, the rectifier bridge（DD1）The 3rd output end then connect VL- electricity Source, the rectifier bridge（DD1）The 4th output end then connect VL+ power supplys.

9. circuit according to claim 8, it is characterised in that：The receiving processing circuit includes the second diode（D2）、 3rd diode（D3）, the 4th diode（D4）, the 5th diode（D5）, the 6th diode（D6）, the 7th diode（D7）, 11 electric capacity（C11）, the 12nd electric capacity（C12）, the 13rd electric capacity（C13）, the 14th electric capacity（C14）, the 15th electric capacity （C15）, the 4th optocoupler（UP4）, the 5th optocoupler（UP5）, the 13rd resistance（R13）, the 14th resistance（R14）, the 15th resistance （R15）, the 16th resistance（R16）, the 17th resistance（R17）, the 18th resistance（R18）, the 19th resistance（R19）, the 20th Resistance（R20）, the 21st resistance（R21）, the first triode（Q1）, the second triode（Q2）, the 3rd triode（Q3）；It is described Second diode（D2）Positive pole connection VL+ power supplys, the 11st electric capacity（C11）Other end connection VL- power supplys, described the Two diodes（D2）Negative pole be then connected to the 13rd resistance（R13）One end, the 13rd resistance（R13）The other end then Connect the 11st electric capacity（C11）One end, the 13rd resistance（R13）The other end be connected to the 14th resistance（R14）'s One end, the 14th resistance（R14）One end be additionally coupled to the first triode（Q1）Colelctor electrode, the 14th resistance （R14）The other end then connect the first triode（Q1）Base stage, the 14th resistance（R14）The other end be also connected with the tenth Two electric capacity（C12）One end, first triode（Q1）Base stage be additionally coupled to the 3rd diode（D3）Negative pole, described 12 electric capacity（C12）The other end be further connected to the 11st electric capacity（C11）The other end and the 3rd diode（D3）Just Pole, the 3rd diode（D3）Positive pole be additionally coupled to the 13rd electric capacity（C13）The other end, the 13rd electric capacity （C13）One end be additionally coupled to the first triode（Q1）Emitter stage, first triode（Q1）Emitter stage be additionally coupled to 17th resistance（R17）One end, second diode（D2）Positive pole be additionally coupled to the 15th resistance（R15）One end, 15th resistance（R15）The other end be then connected to the 6th diode（D6）Positive pole, the 6th diode（D6）'s Negative pole is then connected to the 3rd triode（Q3）Base stage, the 15th resistance（R15）One end be additionally coupled to the 4th diode （D4）Positive pole, the 4th diode（D4）Negative pole connect the 5th diode（D5）Negative pole, the 5th diode （D5）Negative pole then connect the 16th resistance（R16）One end, the 16th resistance（R16）The other end then connect VL- power supplys, 5th diode（D5）Positive pole then connect the 17th resistance（R17）The other end, the 17th resistance（R17）It is another One end is additionally coupled to the second triode（Q2）Base stage, second triode（Q2）Emitter stage be also connected with the 17th resistance （R17）One end, second triode（Q2）Colelctor electrode be then connected to the 19th resistance（R19）One end, the described tenth Nine resistance（R19）The other end then connect the 4th optocoupler（UP4）First end, the 3rd triode（Q3）Colelctor electrode connection 18th resistance（R18）One end, the 18th resistance（R18）The other end then connect the 7th diode（D7）Negative pole, 7th diode（D7）Negative pole be additionally coupled to the 4th optocoupler（UP4）The second end, the 3rd triode（Q3）Hair Emitter-base bandgap grading is connected to the 5th optocoupler（UP5）First end, the 13rd electric capacity（C13）The other end be additionally coupled to the 7th diode （D7）Positive pole, it is described to the 7th diode（D7）Positive pole be connected to the 5th optocoupler（UP5）The second end；4th optocoupler （UP4）The 4th end then connect the 20th resistance（R20）One end, the 20th resistance（R20）Another termination VDD electricity Source, the 20th resistance（R20）One end be also connected with the 14th electric capacity（C14）One end, the 14th electric capacity（C14）'s The other end and the 4th optocoupler（UP4）The 3rd end be all grounded, the 14th electric capacity（C14）One end be additionally coupled to central processing Arithmetic element module；5th optocoupler（UP5）The 4th end connection VDD power supplys, the 5th optocoupler（UP5）The 3rd end then It is connected to the 21st resistance（R21）One end, the 21st resistance（R21）One end be also connected with the 15th electric capacity （C15）One end, the 15th electric capacity（C15）The other end and the 21st resistance（R21）The other end be all grounded；It is described 15th electric capacity（C15）One end be additionally coupled to central processing arithmetic element module.

10. circuit according to claim 9, it is characterised in that：The signal sending circuit includes the first optocoupler（UP1）、 Second optocoupler（UP2）, the 8th resistance（R8）, the 9th resistance（R9）, the tenth resistance（R10）, the 11st resistance（R11）, it is used for By the VL power supplys and VDD isolated from power in communication module；First optocoupler（UP1）First end connect the 8th resistance（R8）'s One end, the 8th resistance（R8）Another termination VDD power supplys, first optocoupler（UP1）The second end and the second optocoupler （UP2）The second end be connected to central processing arithmetic element module, first optocoupler（UP1）The 3rd end and the second optocoupler （UP2）The 3rd end all connect VL- power supplys, second optocoupler（UP2）First end connect the 9th resistance（R9）One end, it is described 9th resistance（R9）Another termination VDD power supplys, first optocoupler（UP1）The 4th end connect the tenth resistance（R10）One End, the tenth resistance（R10）The other end connect the 11st resistance（R11）One end, the 11st resistance（R11）One End is also connected with VL+ power supplys, the 11st resistance（R11）The other end be connected to the second optocoupler（UP2）The 4th end.