CN203644148U

CN203644148U - Burglar alarm

Info

Publication number: CN203644148U
Application number: CN201420030625.8U
Authority: CN
Inventors: 张谢群
Original assignee: Heilongjiang Institute of Technology
Current assignee: Heilongjiang Institute of Technology
Priority date: 2014-01-17
Filing date: 2014-01-17
Publication date: 2014-06-11
Anticipated expiration: 2024-01-17

Abstract

A burglar alarm is disclosed in the utility model and belongs to the electrical control field. The burglar alarm is disclosed to solve the problem that a burglar alarm of the prior art is high in cost, complex in structure and single in antitheft mode. The burglar alarm comprises a sensing trigger circuit, a monostable triggering device, a voice circuit, an amplification circuit, a loudspeaker BL, n concealed conducting wires S1, S2,..., Sn and n trigger circuits, wherein n is a positive integer greater than or equal to 2, the output end of the sensing trigger circuit is connected with the input end of the monostable triggering device, the output end of the monostable triggering device is connected with the input end of the voice circuit, the output end of the voice circuit is connected with the enabling end of the loudspeaker BL, a KD-9561 chip is adopted as a main control chip in the voice circuit, the output end of each concealed conducting wire S1, S2,..., Sn is connected with the input end of a triggering circuit, the output end of each triggering circuit is connected with the input end of the amplification circuit, and the output end of the amplification circuit is connected with the enabling end of the loudspeaker BL.

Description

Burglar alarm

Technical field

The utility model relates to burglar alarm, belongs to electrical control field.

Background technology

Along with the raising of people's living standard, people's antitheft consciousness is also more and more higher, and the raising of science and technology is also the antitheft possibility that provides.On existing market, exist panoramic alarm.As infrared ray, temperature sense and remote sensing etc.But all there is following shortcoming in them: 1, complex structure, though above-mentioned any be all high-tech product, therefore their inner structure is all very complicated, and the result that complex structure the causes high and daily servicing inconvenience that is failure rate; 2, this height, high-tech is always closely connected with expensive, and expensive result is the not ubiquity of promoting the use of; 3, power consumption, total yes the consumption electric energy of burglar alarm of electricity consumption work.4, no matter be infrared ray, temperature sense or remote sensing, mostly cannot be by various ways combination, and mode is single, can not be more rationally antitheft.

Summary of the invention

The utility model object is that existing burglar alarm cost is high in order to solve, complex structure, problem that antitheft mode is single, and a kind of burglar alarm is provided.

Burglar alarm described in the utility model, it comprises sensing trigger circuit, monostable trigger, sound circuit, amplifying circuit, loudspeaker BL, n bar hidden conductor S1, S2 ..., a Sn and n trigger circuit; N is more than or equal to 2 positive integer;

The output terminal of sensing trigger circuit is connected with the input end of monostable trigger;

The output terminal of monostable trigger is connected with the input end of sound circuit;

The output terminal of sound circuit is connected with the Enable Pin of loudspeaker BL;

It is main control chip that sound circuit adopts KD-9561 chip;

Every hidden conductor S1, S2 ..., the output terminal of Sn is all connected with the input end of trigger circuit;

The output terminal of each trigger circuit is all connected with an input end of amplifying circuit;

The output terminal of amplifying circuit is connected with the Enable Pin of loudspeaker BL.

Advantage of the present utility model: burglar alarm described in the utility model is simple in structure; do not need programmable logic device (PLD); stable performance; with low cost; and theftproof performance is good; existing generally antitheft; there is again emphasis antitheft; many hidden conductors are arranged in everywhere, can in universal significance, carry out large-area antitheftly, also can lay special stress on protecting the article that emphasis is antitheft; metal touch sheet is connected with the antitheft article of focused protection; in the time that people contacts this metal touch sheet, will report to the police, this alarm can be accomplished omnibearing protection.

Accompanying drawing explanation

Fig. 1 is the theory diagram of burglar alarm described in the utility model;

Fig. 2 is the physical circuit figure of burglar alarm described in the utility model.

Embodiment

Embodiment one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, burglar alarm described in present embodiment, it comprises sensing trigger circuit 1, monostable trigger 2, sound circuit 3, amplifying circuit 5, loudspeaker BL, n bar hidden conductor S1, S2, ..., a Sn and n trigger circuit 4; N is more than or equal to 2 positive integer;

The output terminal of sensing trigger circuit 1 is connected with the input end of monostable trigger 2;

The output terminal of monostable trigger 2 is connected with the input end of sound circuit 3;

The output terminal of sound circuit 3 is connected with the Enable Pin of loudspeaker BL;

It is main control chip that sound circuit 3 adopts KD-9561 chip;

Every hidden conductor S1, S2 ..., the output terminal of Sn is all connected with the input end of trigger circuit 4;

The output terminal of each trigger circuit 4 is all connected with an input end of amplifying circuit 5;

The output terminal of amplifying circuit 5 is connected with the Enable Pin of loudspeaker BL.

Sensing trigger circuit 1 adopt metal touch sheet P to realize;

Monostable trigger 2 comprises NE555 time-base integrated circuit, resistance R 1, capacitor C 3, capacitor C 4 and capacitor C 5;

Sound circuit 3 comprises KD-9561 chip, resistance R 2, resistance R 3, resistance R 4, NPN triode VT3, NPN triode VT4 and PNP triode VT5;

Metal touch sheet P connects 2 pin of NE555 time-base integrated circuit by capacitor C 3;

One end of 6 pin of NE555 time-base integrated circuit and 7 pin while contact resistance R1 and one end of capacitor C 4, another termination power+5V of resistance R 1, the other end ground connection of capacitor C 4;

4 pin and 8 pin of NE555 time-base integrated circuit meet power supply+5V;

1 pin ground connection of NE555 time-base integrated circuit;

5 pin of NE555 time-base integrated circuit are by capacitor C 5 ground connection;

3 pin of NE555 time-base integrated circuit connect the base stage of NPN triode VT3 by resistance R 2;

The grounded emitter of NPN triode VT3;

The collector of NPN triode VT3 connects 2 pin of KD-9561 chip;

4 pin of KD-9561 chip meet power supply+5V;

Resistance in series R3 between 6 pin of KD-9561 chip and 7 pin;

3 pin of KD-9561 chip connect the base stage of NPN triode VT4;

The grounded emitter of NPN triode VT4;

The collector of NPN triode VT4 connects power supply+5V by resistance R 4;

The collector of NPN triode VT4 also connects the base stage of PNP triode VT5;

The emitter of PNP triode VT5 meets power supply+5V;

The collector of PNP triode VT5 connects one end of loudspeaker BL; The other end ground connection of loudspeaker BL.

Amplifying circuit 5 comprises NPN type triode VT1, positive-negative-positive triode VT2, capacitor C 1, capacitor C 3 and resistance R 5;

The structure of n trigger circuit 4 is identical, comprises n parallel resistance R11, R21 ..., Rn1; N resistance in series R12, R22 ..., Rn2; N diode D1, D2 ..., Dn; N turn-off thyristor DT1, DT2 ..., DTn; With n LED 1, LED2 ..., LEDn;

+ 5V power supply connects turn-off thyristor DT1 simultaneously, DT2 ..., the anode of DTn;

Describe as an example of the 1st trigger circuit example, a parallel resistance R11 in parallel between the gate pole of turn-off thyristor DT1 and anode, the gate pole of turn-off thyristor DT1 connects one end of hidden conductor S1, the other end ground connection of hidden conductor S1; The anode of the negative electrode while connecting luminous diode LED1 of turn-off thyristor DT1 and the anode of diode D1; The negative electrode of LED 1 connects one end of resistance in series R12, the other end ground connection of resistance in series R12;

Diode D1, D2 ..., the negative electrode while of Dn and the emitter of positive-negative-positive triode VT2;

The collector of positive-negative-positive triode VT2 connects one end of capacitor C 1 and one end of loudspeaker BL simultaneously;

The base stage of positive-negative-positive triode VT2 connects the collector of NPN type triode VT1;

Capacitor C 3 is connected in parallel between the base stage and emitter of positive-negative-positive triode VT2;

The emitter of NPN type triode VT1 connects the other end of loudspeaker BL;

Parallel resistance R5 between the base stage of NPN type triode VT1 and collector;

Between be connected in parallel on+5V of capacitor C 2 VDD-to-VSS.

Principle of work: there is the part of general warning function, at ordinary times, the turn-off thyristor DT1 on every road, DT2, ..., the trigger end (gate pole) of DTn connects together by hidden conductor and power cathode, turn-off thyristor DT1, DT2 ..., DTn is all in cut-off state.The oscillating alarming circuit being formed by NPN type triode VT1, positive-negative-positive triode VT2, capacitor C 1, capacitor C 3, resistance R 5 and loudspeaker BL because of not electricly do not work, LED 1, LED2, ..., LEDn, once there be hidden conductor to be pulled off, corresponding turn-off thyristor is with regard to conducting, loudspeaker BL ring, this road lumination of light emitting diode, informs that where out of joint security personnel is.

The warning circuit of laying special stress on protecting part is mainly made up of sensing trigger circuit 1, monostable trigger 2, sound circuit 3, is served as respectively by metal touch sheet P, NE555, KD-9561 chip.P is and door lock and other metal touch sheets that needs antitheft metal object to be connected.

As long as finger contact metal touch sheet P, the induced signal of human body adds on 2 pin of NE555 after capacitor C 3 couplings, because human body sensing voltage adds to trigger end 2 pin, make NE555 upset set, 3 pin output high level, NPN type triode VT1 saturation conduction, four sound simulation integrated circuit KD-9651 power connections, send alarm sound true to nature.

Claims

1. burglar alarm, is characterized in that, it comprises sensing trigger circuit (1), monostable trigger (2), sound circuit (3), amplifying circuit (5), loudspeaker BL, n bar hidden conductor S1, S2 ..., a Sn and n trigger circuit (4); N is more than or equal to 2 positive integer;

The output terminal of sensing trigger circuit (1) is connected with the input end of monostable trigger (2);

The output terminal of monostable trigger (2) is connected with the input end of sound circuit (3);

The output terminal of sound circuit (3) is connected with the Enable Pin of loudspeaker BL;

It is main control chip that sound circuit (3) adopts KD-9561 chip;

Every hidden conductor S1, S2 ..., the output terminal of Sn is all connected with the input end of trigger circuit (4);

The output terminal of each trigger circuit (4) is all connected with an input end of amplifying circuit (5);

The output terminal of amplifying circuit (5) is connected with the Enable Pin of loudspeaker BL.

2. burglar alarm according to claim 1, is characterized in that, sensing trigger circuit (1) adopt metal touch sheet P to realize;

Monostable trigger (2) comprises NE555 time-base integrated circuit, resistance R 1, capacitor C 3, capacitor C 4 and capacitor C 5;

Sound circuit (3) comprises KD-9561 chip, resistance R 2, resistance R 3, resistance R 4, NPN triode VT3, NPN triode VT4 and PNP triode VT5;