CN201489074U

CN201489074U - Leakage fire sensing circuit

Info

Publication number: CN201489074U
Application number: CN2009201367633U
Authority: CN
Inventors: 傅俊豪
Original assignee: QUANZHOU JICHAO ELECTRONIC CO Ltd
Current assignee: QUANZHOU JICHAO ELECTRONIC CO Ltd
Priority date: 2009-02-17
Filing date: 2009-02-17
Publication date: 2010-05-26
Anticipated expiration: 2019-02-17

Abstract

The utility model relates to the electronic field of leakage detection, in particular to a leakage fire sensing circuit. The leakage fire sensing circuit comprises a leakage detection module, an amplifying module, a comparison module, a power module, a control module, a display module and a press key module. The leakage detection module has multiple circuits, the control module is inputted after the leakage detection module is connected with an analog switch, and the control module is further connected with a communication module. Because of the technical scheme, the leakage fire sensing circuit has the advantages that the leakage fire sensing circuit realizes multi-circuit detection and intelligent control, can be convenient in communication management, and has a simple and reasonable circuit system.

Description

Electric leakage fire sensing circuit

Technical field

The utility model relates to the electronic applications that electric leakage is surveyed, and relates in particular to electric leakage fire sensing circuit.

Background technology

Along with China's rapid economy development, power consumption increases greatly.Increasing large public building is as crowded places such as supermarket, market, commercial buildings, the item to manage is numerous and diverse, the owner constantly changes the item to manage, the electrical design scheme originally of giving can not meet the electricity consumption requirement, but can not cause owner's attention, cause very big electric disaster hidden-trouble, when it brings interests to people, also bring very serious security against fire problem.In fire, the ratio that always accounts for of electric leakage fire is quite high, crowded place particularly, should pay attention to electrical fire the early detection early warning, get rid of hidden danger.

Chinese patent application number is 200320122061.2 electrical fire electric leakage detection alarm device, and it is provided with: current transformer, earth detector, leakage alarm, and detector circuit is made up of wave filter, peaking circuit, amplifying circuit and warning circuit; Alarm is made up of warning circuit and display circuit.Alarm can sound and light alarm, and numeral shows the leakage current size, and the core body that current transformer is made by permeability magnetic material and the coil of coiling on it constitute.This core body is become insert group by two semicircular each core body half parts that are overlapped into by a plurality of semicircle permeability magnetic material sheets.As can be seen, this device adopts single channel to gather electric leakage signal, and does not possess Based Intelligent Control and communication management ability.

The utility model content

Based on above-mentioned situation, adopt single channel to gather electric leakage signal for overcoming the prior art scheme, and the deficiency that does not possess Based Intelligent Control and communication management ability the utility model proposes a kind of multi pass acquisition electric leakage signal and possesses Based Intelligent Control and the electric leakage fire sensor of communication management ability.This device adopts the multi pass acquisition residual current, select way by analog switch, through computing amplification, voltage comparator relatively, by single-chip microcomputer is core control part, with the various electric leakage signals that collected, through single-chip microcomputer internal processes logic analysis failure judgement type, report to the police by LCD demonstration fault type, alert acoustic-electric road, drive breaker device dropout outage, the single-chip processor i/o mouth, is sent in the PC software systems various fault-signals by bus mode.

The technical solution of the utility model is:

Electric leakage fire sensing circuit of the present utility model comprises detection of electrical leakage module, amplification module, comparison module, power module, control module, display module, key-press module.Wherein, described detection of electrical leakage module is a multichannel, and imports described control module after being connected to analog switch, and described control module also is connected with communication module.

Further, described control module is the control circuit system that peripheral cells such as single-chip microcomputer and watchdog chip, crystal oscillator constitute.Also be connected with storer on the described single-chip microcomputer.

Further, described detection of electrical leakage module is 16 the tunnel.

Further, described display module is the LCD display module.Described power module is that bridge rectifier circuit and power supply chip are formed.Described communication module is the RS485 communication module.

Further, described power supply chip is 7805 and 7812.

The utility model is owing to adopt technique scheme, has multichannel detection, Based Intelligent Control, can carry out to the aspect advantage of communication management and Circuits System advantages of simple.

Description of drawings

Fig. 1 is a circuit module connection layout of the present utility model;

Fig. 2 is the circuit theory diagrams of the utility model most preferred embodiment.

Embodiment

Existing accompanying drawings and embodiment further specify the utility model.

As shown in Figure 1, electric leakage fire sensing circuit of the present utility model comprises detection of electrical leakage module, amplification module, comparison module, power module, control module, display module, key-press module.Wherein, described detection of electrical leakage module is a multichannel, and imports described control module after being connected to analog switch, and described control module also is connected with communication module.

Consult shown in Figure 2, multichannel detection of electrical leakage control circuit principle of the present utility model is that live wire and zero line pass zero sequence current mutual inductor LA1 simultaneously, size of current equates, direction is opposite, when phase line has earth fault, size of current is no longer equal, direction is identical, at this moment current transformer LA1 produces small ac voltage signal, this signal is through resistance R 1 current limliting, resistance R 4 dividing potential drops, capacitor C 1 filtering, diode D1, diode D2 forms forward and reverse clamped circuit, be input to analog switching circuit U1 the 13rd pin, by the inner switching controls of analog switch U1, by analog switch U1 the 3rd pin signal is exported, be input to amplifier U5 the 3rd pin again, after internal arithmetic is amplified through amplifier U5, export by 6 pin, transformation resistance R7 resistance can be adjusted the enlargement factor of amplifier U5, after diode D7 rectification, resistance R 9 current limlitings, resistance R 10 dividing potential drops, capacitor C 14 low frequency filterings, simultaneously this signal is input to amplifier U6 the 2nd pin and the 6th pin respectively, the comparator circuit of forming 2 grades of different magnitudes of voltage, one: by amplifier U6, resistance R 17 current limlitings, resistance R 11 dividing potential drops are formed one group of setting voltage, as electric leakage early warning comparator circuit, when the voltage of amplifier U6 the 2nd pin input during greater than amplifier U6 the 3rd pin, amplifier U6 the 1st pin will be exported a voltage, make analog switch U2 the 3rd pin I/O end be low level, while analog switch U2 the 27th, the output of 28 pin driven in series, be added to chip for driving U8 the 14th pin, built-in 8 bit serial I/O of chip for driving U8 or parallel Output Shift Register, has high resistant off state function, directly shinny through 1 flicker of resistance R 36 dividing potential drop driving LED, do not send alert sound this moment, another road is output as analog switch U2 (33) pin and becomes low level by original high level then, make triode T7 conducting through resistance R 14 current limliting dividing potential drops, relay J 2 adhesives, exporting one often opens or normally closed some signal, its two: by amplifier U6, resistance R 18 current limlitings, resistance R 57 dividing potential drops are formed one group of setting voltage, as the leakage-current alarm comparator circuit, when the voltage of amplifier U6 the 4th pin input during greater than amplifier U6 the 5th pin, amplifier U6 the 7th pin will be exported a voltage, make analog switch U2 the 2nd pin I/O end be low level, analog switch U2 is with time-divisions 3 tunnel output, the 1 the tunnel, by analog switch U2 the 27th, the output of 28 pin driven in series, be added to chip for driving U8 the 14th pin, directly shinny through 1 flicker of resistance R 36 dividing potential drop driving LED, do not send alert sound this moment, the 2nd route analog switch U2 the 12nd, 13,14 pin serials output drives LCD display and shows " the 1 road leak current fault " printed words, simultaneously, transfer low level by analog switch U2 the 17th pin to by original high level, make optocoupler U12 conducting through resistance R 16 current limlitings, make triode T5 become high level by low level, import music integrated circuit U11 the 1st pin simultaneously and U10 the 6th pin provides power supply, music integrated circuit U11 the 2nd pin output audio signal, be added to audio frequency amplifier U10 the 3rd pin, after the internal audio frequency signal amplifies, send alarm sound through loudspeaker Y by the output of the 5th pin.Another road is output as analog switch U2 the 32nd pin and becomes low level by original high level then, makes triode T6 conducting through resistance R 15 current limliting dividing potential drops, and relay J 1 adhesive is exported one and often opened or normally closed some signal.Described herein is 1 tunnel detection of electrical leakage control principle wherein, and other ways are identical with 1 the tunnel, no longer repeats here.

By 15 pin of resistance R 32, resistance R 33, resistance R 34, K switch 1-K9, analog switch U2, the keyboard control circuit that 16 pin are formed, can be to alert sound setting, self check, button operation such as reset.

Rs485 level conversion of the present utility model realizes that circuit for remotely controlling is by resistance R 30, optocoupler U13, triode T3, resistance R 27, resistance R 25 and resistance R 26, optocoupler U14, resistance R 28, resistance R 29, the high-low level change-over circuit that resistance R 19 is formed, when 15 pin of analog switch U2 are exported high level, make triode T2 conducting through resistance R 19 current limlitings, optocoupler U14 output low level, 15 pin of both circuit and analog switch U2,36 pin form the closed loop current driving circuit, logical 75176 special-purpose RS485 integrated circuit carry out level conversion, be added to PC by com port, special-purpose configuration software is installed, can lead to Long-distance Control to two groups of high-low level change-over circuits and the inner I/O mouth of analog switch U2, realize operations such as " remote regulating; remote measurement; remote control; distant news ", and can write down the warning current state by software, print fault form etc.

Power circuit of the present utility model has the two-way independent current source to supply with, and guarantees the trigger circuit reliably working.The bridge rectifier circuit of forming by diode 1D1-1D4, through capacitor C 9, capacitor C 8 low-and high-frequency filtering, be input to the 1st pin of power supply chip U16, through inner voltage stabilizing, DC voltage by the 3rd pin output 5V, through capacitor C 6, capacitor C 7 low-and high-frequency filtering, provide+direct-current working volts of 5V to the utility model.The bridge rectifier circuit of forming by diode 1D5-1D8, through capacitor C 10, capacitor C 11 filtering, be input to the 1st pin of power supply chip U17, through inner voltage stabilizing, DC voltage by the 3rd pin output 12V, through capacitor C 12, capacitor C 13 low-and high-frequency filtering, provide+direct-current working volts of 12V to the utility model.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection domain of the present utility model.

Claims

1. electric leakage fire sensing circuit, comprise detection of electrical leakage module, amplification module, comparison module, power module, control module, display module, key-press module, it is characterized in that: described detection of electrical leakage module is a multichannel, and import described control module after being connected to analog switch, described control module also is connected with communication module.

2. electric leakage fire sensing circuit as claimed in claim 1 is characterized in that: described control module is the control circuit system that peripheral cells such as single-chip microcomputer and watchdog chip, crystal oscillator constitute, and also is connected with storer on the described single-chip microcomputer.

3. electric leakage fire sensing circuit as claimed in claim 1 is characterized in that: described detection of electrical leakage module is 16 the tunnel.

4. electric leakage fire sensing circuit as claimed in claim 1 is characterized in that: described display module is the LCD display module; Described power module is that bridge rectifier circuit and power supply chip are formed; Described communication module is the RS485 communication module.

5. electric leakage fire alarm protection system as claimed in claim 4 is characterized in that: described power supply chip is 7805 integrated chips and 7812 integrated chips.