CN2137380Y

CN2137380Y - Fully integrated anti-theft alarm

Info

Publication number: CN2137380Y
Application number: CN 92235023
Authority: CN
Inventors: 陈国华
Original assignee: OLIN ELECTRONIC TECHNOLOGY INST OF SHAOYANG NORMAL TRAINING SCHOOL
Current assignee: OLIN ELECTRONIC TECHNOLOGY INST OF SHAOYANG NORMAL TRAINING SCHOOL
Priority date: 1992-10-07
Filing date: 1992-10-07
Publication date: 1993-06-30
Anticipated expiration: 2002-10-07

Abstract

The utility model relates to a fully integrated anti-theft alarm, which comprises power supply, a sensing switch, a signal identifying and judging circuit, a monostable triggering delay circuit, an alarm signal generating circuit, an audio signal amplifier, and a loudspeaker. The utility model not only has the advantage of the original common anti-theft alarm, but also has the advantages of good reliability, automatic recognition and judgement, open circuit protection, short circuit protection, damage protection, and complete function.

Description

Fully integrated anti-theft alarm

The utility model belongs to a kind of burglar alarm.

The situation is tense for current social security, and the theft crime happens occasionally, and technological prevention is the strong assistant that manpower is taken precautions against, though original popular burglar alarm has many advantages, also have poor reliability, can not discern defective such as automatic stop, thereby result of use is not good.

The purpose of this utility model is original popular burglar alarm is sublated, and designs a kind of reliability height, intellectuality, and has the fully integrated burglar alarm of anti-open circuit, anti-short circuit, tamper-proof function.

The purpose of this utility model realizes by following technological approaches: a kind of fully integrated burglar alarm, comprise power supply, loudspeaker, and it also has sensitive switch AG, signal identification decision circuitry IC simultaneously ₁, monostable triggers delay circuit IC ₂, alerting signal generation circuit, audio power amplifier IC ₅, sensitive switch AG series resistor R ₀After be connected to signal identification decision circuitry IC ₁Input end, signal identification decision circuitry IC ₁Output terminal by triggering delay circuit IC with monostable behind phase inverter ₂An input end join, monostable trigger other input end of delay circuit with by R ₅, C ₃The mid point of the time-delay branch road of forming joins, and the output terminal of monostable triggering delay circuit is connected in the input end of alerting signal generation circuit, and the alerting signal that alerting signal generation circuit produces is by audio power amplifier IC ₅Deliver to loudspeaker SP after the amplification and send corresponding alerting signal.

Principle of work of the present utility model is as follows:

Closed and and the resistance R of sensitive switch AG at ordinary times ₀Series connection causes signal identification decision circuitry IC ₁Be output as low level, late-class circuit is not worked, in case sensitive switch AG open circuit or by sensitive switch AG and resistance R ₀The branch road that constitutes all will be caused signal identification decision circuitry IC by short circuit ₁The level of each input end changes, signal identification this moment decision circuitry IC ₁The output high level makes monostable trigger delay circuit IC thereby this high level becomes low level behind phase inverter ₂Output terminal upset be high level, this high level signal is delivered to alerting signal generation circuit input end, makes its work produce alerting signal, this alerting signal is through audio power amplifier IC ₅Make loudspeaker SP send corresponding alerting signal after the amplification.

After sensitive switch AG recloses, signal identification decision circuitry IC ₁Output terminal become low level again, monostable triggers delay circuit IC ₂An input end become high level immediately, but this moment, monostable triggered delay circuit IC ₂Can't reset at once, continue so report to the police.As time goes on, power supply is by being resistance R ₅To capacitor C ₃Capacitor C is worked as in charging ₃When both end voltage rose to 2/3 supply voltage, monostable triggered delay circuit IC ₂Output terminal revert to low level automatically, chimes of doom stops automatically.Reporting to the police the duration can be by formula t=1.1R ₅C ₃Numerical value determine.If sensitive switch AG does not restore always, it is more than then to discern automatically and report to the police.

The utlity model has the advantage of original popular burglar alarm, and reliable operation, can discern automatically, also possess anti-open circuit, anti-short circuit, vandal-proof advantage simultaneously.

Accompanying drawing provides the utility model an embodiment:

Fig. 1 is fully integrated burglar alarm electrical schematic diagram;

The embodiment that provides below in conjunction with accompanying drawing is further described the utility model:

A kind of fully integrated burglar alarm is by power supply, sensitive switch AG, signal identification decision circuitry IC ₁, monostable triggers delay circuit IC ₂, alerting signal generation circuit, audio signal amplifier IC ₅Form with loudspeaker SP, existing as follows to the each several part division:

1, power supply: power supply of the present utility model can adopt the dual-purpose form of AC and DC, alternating current after step-down, rectification, filtering again through integrated package of pressure-stabilizing IC ₆(can select 7812 types for use) voltage stabilizing power supply is when no alternating current, by direct supply X ₂Directly power supply.

2, sensitive switch AG: sensitive switch AG can select magnetic switch, infrared probe, microwave probe or dynamo-electric probe etc., the resistance R of connecting simultaneously for use thereon ₀(R ₀Can select 150K for use).

3, signal identification decision circuitry IC ₁: signal identification decision circuitry IC ₁Can select CD4011 type integrated package for use, its input end with by sensitive switch AG and resistance R ₀The branch road that series connection constitutes connects, and its output terminal (11 pin) joins with phase inverter.

4, phase inverter: phase inverter can adopt triode V ₁(9013 type), triode V ₁Base stage meet signal identification decision circuitry IC ₁Output terminal, its collector order stable state triggers delay circuit IC ₂An input end (2 pin).

5, monostable triggers delay circuit IC ₂: monostable triggers delay circuit IC ₂Can select NE555 type integrated package for use, its in addition two input ends (6 pin and 7 pin) with by R ₅, C ₃The mid point of the time-delay branch road that constitutes joins, and its output terminal and alerting signal generation circuit join.For improving the reliability of circuit working, can be at IC ₂Stabilivolt DW of output termination, for improving the antijamming capability of circuit, in circuit, be provided with simultaneously by capacitor C ₂, C ₄, C ₅, resistance R ₆With diode VD ₁The anti-interference network that constitutes.

6, alerting signal generation circuit: this circuit can be Chinese language alarm generator IC ₃(LQ46 type), sound generator IC ₄The two combination of (KD9561 type) or its if adopt its two combination, then utilizes a switch S ₂Select alerting signal flexibly.

7, audio power amplifier IC ₅: IC ₅Can select integrated operational amplifier TDA2002 for use.

For constituting huge warning system, realize centralized management and control, include sensitive switch AG and resistance R in the system ₀Series arm is discerned decision circuitry IC at interior by signal ₁Triggering the way of the branch road of delay circuit series connection formation can expand arbitrarily with monostable, and simultaneity factor also can be equipped with external speaker jack.

Claims

1, a kind of fully integrated burglar alarm comprises power supply, loudspeaker, it is characterized in that it also has sensitive switch AG, signal identification decision circuitry IC ₁, monostable triggers delay circuit IC ₂, alerting signal generation circuit, audio power amplifier IC ₅, sensitive switch AG series resistor R ₀After be connected to signal identification decision circuitry IC ₁Input end, signal identification decision circuitry IC ₁Output terminal by triggering delay circuit IC with monostable behind phase inverter ₂An input end join, monostable triggers delay circuit IC ₂Other input end with by R ₅, C ₃The mid point of the time-delay branch road of forming joins, and the output terminal of monostable triggering delay circuit is connected in the input end of alerting signal generation circuit, and the alerting signal that alerting signal generation circuit produces is by audio power amplifier IC ₅Deliver to loudspeaker SP after the amplification and send corresponding alerting signal.

2, burglar alarm according to claim 1 is characterized in that monostable triggers delay circuit IC ₂Output terminal connected a stabilivolt DW, monostable triggers delay circuit IC ₂The high level signal of output is delivered to the input end of alerting signal generation circuit after stabilivolt DW voltage stabilizing.

3, burglar alarm according to claim 1 and 2 is characterized in that described alerting signal generation circuit is Chinese language alarm generator IC ₃

4, burglar alarm according to claim 1 and 2 is characterized in that described alerting signal generation circuit is sound generator IC ₄

5, burglar alarm according to claim 1 and 2 is characterized in that described alerting signal generation circuit is by Chinese language alarm generator IC ₃, sound generator IC ₄With switch S ₂Form.

6, burglar alarm according to claim 1 is characterized in that described sensitive switch AG is magnetic switch or infrared probe, microwave probe, dynamo-electric probe.

7, burglar alarm according to claim 1 and 2, it is characterized in that having at least in the system one comprise sensitive switch AG interior by signal identification decision circuitry IC ₁Trigger delay circuit IC with monostable ₂The branch road that series connection constitutes, the way of this branch road can be expanded arbitrarily.

8, burglar alarm according to claim 3, it is characterized in that having at least in the system one comprise sensitive switch AG interior by signal identification decision circuitry IC ₁Trigger delay circuit IC with monostable ₂The branch road that series connection constitutes, the way of this branch road can be expanded arbitrarily.

9, burglar alarm according to claim 4, it is characterized in that having at least in the system one comprise sensitive switch AG interior by signal identification decision circuitry IC ₁Trigger delay circuit IC with monostable ₂The branch road that series connection constitutes, the way of this branch road can be expanded arbitrarily.

10, burglar alarm according to claim 5, it is characterized in that having at least in the system one comprise sensitive switch AG interior by signal identification decision circuitry IC ₁Trigger delay circuit IC with monostable ₂The branch road that series connection constitutes, the way of this branch road can be expanded arbitrarily.

11, burglar alarm according to claim 1 is characterized in that described phase inverter is triode V ₁