CN203224971U

CN203224971U - Residual-current-type electrical fire detector

Info

Publication number: CN203224971U
Application number: CN 201320233839
Authority: CN
Inventors: 傅加发
Original assignee: FUJIAN JUNHAO ELECTRONICS Co Ltd
Current assignee: FUJIAN JUNHAO ELECTRONICS Co Ltd
Priority date: 2013-05-03
Filing date: 2013-05-03
Publication date: 2013-10-02
Anticipated expiration: 2023-05-03

Abstract

The utility model relates to a residual-current-type electrical fire detector. The fire detector comprises a residual current signal collection circuit and a single-chip microcomputer control circuit. An output signal of the residual current signal collection circuit is transmitted to an A/D data conversion circuit through a signal amplification and rectification circuit. An output signal of the A/D data conversion circuit is transmitted to the single-chip microcomputer control circuit. Output signals of the single-chip microcomputer control circuit are transmitted to a Zigbee wireless module circuit, an LCD display circuit and a voice alarm circuit respectively. If a leakage fault occurs in a circuit to be protected, the single-chip microcomputer control circuit performs judgment, the fault current is displayed on the LCD, an acousto-optic alarm is given, the Zigbee wireless module circuit transmits signals, and a data alarm center receives the alarm signals, and displays alarm information, such as alarm address and location. The residual-current-type electrical fire detector is simple in networking, and capable of performing remote monitoring, preventing electrical fires caused by high temperature as section joints are loosening.

Description

The residual-current electrical fire detector

Technical field

The utility model relates to a kind of detector, particularly be a kind of residual-current electrical fire detector.

Background technology

Residual current is commonly called as leakage current, is mainly used in isolating switch or earth leakage protective device protection equipment, the fire that protection causes owing to leak current fault; And the fire that electric leakage causes accounts for more than 40% of fire ratio, brings serious threat for people's the security of the lives and property.

The utility model content

The purpose of this utility model is to provide a kind of residual-current electrical fire detector.

The technical scheme that its technical matters that solves the utility model adopts is: the residual-current electrical fire detector, include residual current signal acquisition circuit and single chip machine controlling circuit, the output signal of described residual current signal acquisition circuit is amplified rectification circuit through signal and is transferred to the A/D data converting circuit, the output signal of described A/D data converting circuit is sent to single chip machine controlling circuit, and the output signal of described single chip machine controlling circuit is sent to Zigbee wireless module circuit, LCD display circuit and voice alarm circuit respectively.

Preferably,Described residual current signal acquisition circuit adopts circuit mutual inductor LN to gather signal.

Preferably,Described signal amplifies the small induced voltage signal of rectified current routing circuit mutual inductor LN generation through resistance R 1 current limliting, after the potentiometer R2 dividing potential drop, signal behind diode D1, D2 amplitude limit is input to AD623 operational amplifier IC2 again, by the d. c. voltage signal that the output signal of AD623 operational amplifier IC2 is rectified into through diode D3, the linear voltage of after resistance R 4 current limlitings, resistance R 5 dividing potential drops, capacitor C 2 filtering, exporting.

Preferably,Described Zigbee wireless module circuit adopts ZM2410 wireless module IC4.

By adopting above-mentioned technical scheme; the beneficial effects of the utility model are: when protected circuit generation leak current fault; the utility model judges that through single chip machine controlling circuit LCD shows current fault current, and sends sound and light alarm; by ZigBee wireless module circuit sending signal; when the data alarm center receives alerting signal, warning messages such as orientation, display alarm address, it is simple to have a networking; remote monitoring is avoided producing high temperature because section header is loosening and is caused electrical fire.

Description of drawings

Fig. 1 is frame structure synoptic diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1 and Figure 2, residual-current electrical fire detector of the present utility model, include residual current signal acquisition circuit 1 and single chip machine controlling circuit 2, the output signal of described residual current signal acquisition circuit 1 is amplified rectification circuit 11 through signal and is transferred to A/D data converting circuit 12, the output signal of described A/D data converting circuit 12 is sent to single chip machine controlling circuit 2, and the output signal of described single chip machine controlling circuit 2 is sent to Zigbee wireless module circuit 21, LCD display circuit 22 and voice alarm circuit 23 respectively.

Described residual current signal acquisition circuit 1 adopts circuit mutual inductor LN to gather signal, described signal amplifies small induced voltage signal that rectification circuit 11 produces by circuit mutual inductor LN through resistance R 1 current limliting, after the potentiometer R2 dividing potential drop, again through diode D1, signal behind the D2 amplitude limit is input to AD623 operational amplifier IC2, the d. c. voltage signal that is rectified into through diode D3 by the output signal of AD623 operational amplifier IC2, through resistance R 4 current limlitings, resistance R 5 dividing potential drops, the linear voltage of exporting after capacitor C 2 filtering, when phase line has the earth leakage fault, circuit mutual inductor LN magnetic flux and no longer equalling zero, it produces small induced voltage signal, this signal is through resistance R 1 current limliting, after the potentiometer R2 dividing potential drop, again through diode D1, signal behind the D2 amplitude limit is input to the 3rd pin of AD623 operational amplifier IC2, after the inner amplification of AD623 operational amplifier IC2, change resistance R 3 and can regulate enlargement factor, the d. c. voltage signal that is rectified into through diode D3 by the 6th pin output signal of AD623 operational amplifier IC2, through resistance R 4 current limlitings, resistance R 5 dividing potential drops, the linear voltage of exporting after capacitor C 2 filtering, the linear voltage of output is input to the 2nd pin input end of A/D data-switching chip IC 3 again, after the A/D conversion, signal is input to the 36th of single-chip microcomputer IC1,37,38 pin, read the data of A/D data-switching chip IC 3 through single-chip microcomputer IC1 after, when handling judgement above the electric leakage setting value by single-chip microcomputer IC1 internal processes, divide three the tunnel to send control signal, first via output, by the 7th of ZM2410 wireless module IC4, the 10th of 6 ends and single-chip microcomputer IC1,11 ends are formed Zigbee wireless module circuit 21, ZM2410 wireless module IC4 is the embedded serial ports transparent transmission of the Zigbee of built-in 2.4GHZ (some multiple spot and point-to-multipoint) communications protocol, support aerial upgrade firmware or configuration far module information, up to the output of the power of 7dBm and-receiving sensitivity of 100dBm, can satisfy telecommunication, send the AT instruction by single-chip microcomputer IC1 ZM2410 wireless module IC4 is realized wireless data transceiving, switch pin with the RS-485 direction, send current warning message to data center, realize the honeycomb fashion networking, it is simple to have networking, wireless transmission is saved construction costs; Another road output by the 28th pin output low level signal of single-chip microcomputer IC1, makes news Chinese percussion instrument Y send alarm sound, expression cable section header temperature over-range.Third Road output is sent data drive signal by single-chip microcomputer IC1 to LCD display IC, and LCD display IC shows current leak current fault current value, is convenient to the Operation and Maintenance personnel, and leak current fault is overhauled.

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. residual-current electrical fire detector, it is characterized in that: include residual current signal acquisition circuit (1) and single chip machine controlling circuit (2), the output signal of described residual current signal acquisition circuit (1) is amplified rectification circuit (11) through signal and is transferred to A/D data converting circuit (12), the output signal of described A/D data converting circuit (12) is sent to single chip machine controlling circuit (2), and the output signal of described single chip machine controlling circuit (2) is sent to Zigbee wireless module circuit (21) respectively, LCD display circuit (22) and voice alarm circuit (23).

2. residual-current electrical fire detector according to claim 1 is characterized in that: described residual current signal acquisition circuit (1) employing circuit mutual inductor LN collection signal.

3. residual-current electrical fire detector according to claim 1 and 2, it is characterized in that: described signal amplifies small induced voltage signal that rectification circuit (11) produces by circuit mutual inductor LN through resistance R 1 current limliting, after the potentiometer R2 dividing potential drop, signal behind diode D1, D2 amplitude limit is input to AD623 operational amplifier IC2 again, by the d. c. voltage signal that the output signal of AD623 operational amplifier IC2 is rectified into through diode D3, the linear voltage of after resistance R 4 current limlitings, resistance R 5 dividing potential drops, capacitor C 2 filtering, exporting.

4. residual-current electrical fire detector according to claim 1 and 2 is characterized in that: described Zigbee wireless module circuit (21) employing ZM2410 wireless module IC4.