CN204990572U

CN204990572U - Burglar alarm for valuables

Info

Publication number: CN204990572U
Application number: CN201520591539.9U
Authority: CN
Inventors: 陈荣辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-01
Filing date: 2015-08-01
Publication date: 2016-01-20
Anticipated expiration: 2025-08-01

Abstract

The utility model discloses a burglar alarm for valuables, including transformer W, rectifier bridge T, electric capacity C1 and chip IC1, the both ends of 220V line voltage are connected respectively at transformer W's winding N1's both ends, rectifier bridge T's port 1 and rectifier bridge T's port 3 are connected respectively to transformer W's winding N2's both ends, rectifier bridge T's 2 pins 1 of connecting electric capacity C1 and chip IC1 of port, chip IC1's 2 other ends of connecting electric capacity C1 of pin, rectifier bridge T's port 4, battery E's negative pole, speaker B, triode V2's projecting pole and unidirectional thyristor Q1's negative pole. The utility model discloses burglar alarm adopts micro -gap switch as the source of triggering, will trigger warning circuit as long as the valuables who is protected removes, and the circuit adopts commercial power and battery duplicate supply simultaneously, can prevent effectively that the burglar from explaiing, therefore the circuit has, and simple structure, disguise are good, dual power supply's advantage.

Description

A kind of theft-proof alarm for valuable articles

Technical field

The utility model relates to a kind of alarm, specifically a kind of theft-proof alarm for valuable articles.

Background technology

Nowadays; people more and more pay attention to household safe protected working; the alarm that market occurs is varied; but most of alarm is all protect in scope; although pretective acreage is larger; but its sensitivity decreases; and easily discovered by burglar and crack; and for some valuables; as the article such as safety cabinet, notebook computer do not need alarm too on a large scale; and burglar at night, theft can disconnect electric brake often, major part uses the alarm of mains-supplied all can quit work, and robber is successfully committed a crime.

Utility model content

The purpose of this utility model is to provide a kind of structure simple, the anti-theft-proof alarm for valuable articles cracked, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of theft-proof alarm for valuable articles, comprise transformer W, rectifier bridge T, electric capacity C1 and chip IC 1, the two ends of the winding N1 of described transformer W connect the two ends of 220V line voltage respectively, the two ends of the winding N2 of transformer W connect the port one of rectifier bridge T and the port 3 of rectifier bridge T respectively, the port 2 of rectifier bridge T connects the pin 1 of electric capacity C1 and chip IC 1, the pin 2 of chip IC 1 connects the other end of electric capacity C1, the port 4 of rectifier bridge T, the negative pole of accumulator E, loudspeaker B, the emitter of triode V2 and the negative electrode of unidirectional thyristor Q1, the pin 3 of chip IC 1 connects the anode of diode D1, the negative electrode connecting valve S1 of diode D1 and the positive pole of accumulator E, the other end contact resistance R1 of switch S 1, resistance R3, the emitter of triode V1 and the pin 5 of chip IC 2, the other end of triode V1 base stage contact resistance R1 and the collector of triode V2, the base stage of triode V2 connects the pin 3 of chip IC 2, the pin 7 contact resistance R2 of chip IC 2, the other end of the pin 8 contact resistance R2 of chip IC 2, the pin 2 of chip IC 2 connects the anode of unidirectional thyristor Q1, the control pole of unidirectional thyristor Q1 connects microswitch K, the other end of the other end contact resistance R3 of microswitch K.

As preferred version of the present utility model: the model of described chip IC 1 is LM7809.

As preferred version of the present utility model: the model of described chip IC 2 is KD9561.

Compared with prior art; the beneficial effects of the utility model are: the utility model burglar alarm adopts microswitch as trigger source; will trigger alarm circuit as long as protected valuables move; circuit adopts civil power and accumulator duplicate supply simultaneously; can effectively prevent burglar from cracking, therefore circuit has that structure is simple, the advantage of good concealment, dual power supply.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of theft-proof alarm for valuable articles.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, a kind of theft-proof alarm for valuable articles, comprise transformer W, rectifier bridge T, electric capacity C1 and chip IC 1, the two ends of the winding N1 of described transformer W connect the two ends of 220V line voltage respectively, the two ends of the winding N2 of transformer W connect the port one of rectifier bridge T and the port 3 of rectifier bridge T respectively, the port 2 of rectifier bridge T connects the pin 1 of electric capacity C1 and chip IC 1, the pin 2 of chip IC 1 connects the other end of electric capacity C1, the port 4 of rectifier bridge T, the negative pole of accumulator E, loudspeaker B, the emitter of triode V2 and the negative electrode of unidirectional thyristor Q1, the pin 3 of chip IC 1 connects the anode of diode D1, the negative electrode connecting valve S1 of diode D1 and the positive pole of accumulator E, the other end contact resistance R1 of switch S 1, resistance R3, the emitter of triode V1 and the pin 5 of chip IC 2, the other end of triode V1 base stage contact resistance R1 and the collector of triode V2, the base stage of triode V2 connects the pin 3 of chip IC 2, the pin 7 contact resistance R2 of chip IC 2, the other end of the pin 8 contact resistance R2 of chip IC 2, the pin 2 of chip IC 2 connects the anode of unidirectional thyristor Q1, the control pole of unidirectional thyristor Q1 connects microswitch K, the other end of the other end contact resistance R3 of microswitch K.

The model of chip IC 1 is LM7809.The model of chip IC 2 is KD9561.

Principle of work of the present utility model is: 220V line voltage becomes 9V galvanic current after transformer W step-down, rectifier bridge T rectification, electric capacity C1 filtering and three terminal regulator IC1 voltage stabilizing, 9V direct current accumulators E after diode D1 charges, when the voltage of accumulator E is elevated to 9V, stop charging, one-way SCR Q1, resistance R3 and microswitch K form control machines on-off circuit; IC1, R2, V1, V2 and B form warning circuit.Microswitch K is arranged on the bottom of valuables, and at ordinary times, K is subject to the compressing of valuables, and its two normally closed contact is disconnected, Q1 Triggerless and blocking, and alarm does not work.When valuables have been removed or be mobile, K two contact has closed automatically, and the trigger end of Q1 obtains trigger pip through R3 from positive source, Q1 conducting, IC1 is energized work, and the police whistle sound electric signal that its output terminal exports, through V1, V2 power amplification, promotes loudspeaker B and sends loud and clear chimes of doom.Now, even if replaced by household electrical appliances or destroy K, also chimes of doom cannot be stoped.Only have owner to open to be installed together with alarm and other people are difficult to the switch S 1 that finds for the moment; warning could be removed; circuit adopts microswitch as trigger source; will trigger alarm circuit as long as protected valuables move; circuit adopts civil power and accumulator duplicate supply simultaneously; can effectively prevent burglar from cracking, therefore circuit has that structure is simple, the advantage of good concealment, dual power supply.

Claims

1. a theft-proof alarm for valuable articles, comprise transformer W, rectifier bridge T, electric capacity C1 and chip IC 1, it is characterized in that, the two ends of the winding N1 of described transformer W connect the two ends of 220V line voltage respectively, the two ends of the winding N2 of transformer W connect the port one of rectifier bridge T and the port 3 of rectifier bridge T respectively, the port 2 of rectifier bridge T connects the pin 1 of electric capacity C1 and chip IC 1, the pin 2 of chip IC 1 connects the other end of electric capacity C1, the port 4 of rectifier bridge T, the negative pole of accumulator E, loudspeaker B, the emitter of triode V2 and the negative electrode of unidirectional thyristor Q1, the pin 3 of chip IC 1 connects the anode of diode D1, the negative electrode connecting valve S1 of diode D1 and the positive pole of accumulator E, the other end contact resistance R1 of switch S 1, resistance R3, the emitter of triode V1 and the pin 5 of chip IC 2, the other end of triode V1 base stage contact resistance R1 and the collector of triode V2, the base stage of triode V2 connects the pin 3 of chip IC 2, the pin 7 contact resistance R2 of chip IC 2, the other end of the pin 8 contact resistance R2 of chip IC 2, the pin 2 of chip IC 2 connects the anode of unidirectional thyristor Q1, the control pole of unidirectional thyristor Q1 connects microswitch K, the other end of the other end contact resistance R3 of microswitch K.

2. a kind of theft-proof alarm for valuable articles according to claim 1, is characterized in that, the model of described chip IC 1 is LM7809.

3. a kind of theft-proof alarm for valuable articles according to claim 1, is characterized in that, the model of described chip IC 2 is KD9561.