CN2100003U

CN2100003U - Inducted theft-proof alarm

Info

Publication number: CN2100003U
Application number: CN 91201452
Authority: CN
Inventors: 张航辅; 张侠辅
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-23
Filing date: 1991-01-23
Publication date: 1992-03-25

Abstract

The utility model discloses an anti-theft device which generates an alarm signal via the induction of a human body, comprising a neon tube Ne, a controllable silicon SCR, a resistor R-[1], an alarm load SET, etc. When some position of the human body approaches the contact point A, due to the inexistence of the capacitance of the human body, the neon tube is conducted; both ends of the R-[1] generate voltage signals to make the SCR be conducted and to make the SET send out sound / light alarm. The anti-theft device which is easy to adjust according to the requirement has the advantages of high sensitivity, large alarm power, convenient fortification, broad range high safety, wide purpose, strong practicability, very simple circuits, low cost, easy fabrication and sale.

Description

Inducted theft-proof alarm

The utility model is a kind of anti-theft device that produces alerting signal by human body sensing.

Chinese patent literature CN2062083U(notification number) a kind of human body induction type burglar alarm has been proposed, this device sensitivity is higher, but because of having adopted more electronic devices and components and having used integrated circuit, circuit is complicated, and cost is higher comparatively speaking, and owing to be direct current supply, the power and the type of reporting to the police are subjected to bigger restriction, generally can only sounding alarm, and volume can not be too big, otherwise use multistage audio amplifier circuit, cost further raises.Chinese patent literature (notification number CN2055961U) also disclosed a kind of " plain type switch alarm ", its adopts between emitter and the base stage and is connected in series into controllable silicon gate pole and negative electrode, and the transistor switching circuit that collector is connected with the controllable silicon anode, have the low characteristics of cost simple in structure, but at the bottom of its sensitivity, disconnected external transducing signal line (lametta) must be bumped and just chimes of doom can be sent, use inconvenience, because setting up defences of metal wire is limited in scope, and in case must connect good could the use once more after bumping disconnected metal wire for next.This in addition alarm also is direct current supply, can only be to report to the police than small volume.

The purpose of this utility model provides a kind of simple in structure, and is with low cost, highly sensitive, easy to use and can carry out the induction type anti-theft alarm device that sound/light is reported to the police with more high-power.

Structure of the present utility model is as follows: the anode of a controllable silicon SCR is by warning load SET(such as electric bell, a bulb etc.) and link to each other with positive pole that the ground wire or of civil power is higher than the direct supply of neon tube starting voltage and the negative electrode of SCR links to each other with the negative pole of civil power live wire or above-mentioned direct supply, also can allow the negative electrode of SCR link to each other with the negative pole of civil power live wire or above-mentioned direct supply and the anode of SCR directly links to each other with civil power ground wire or dc power anode by SET, under this external above-mentioned any situation, the negative electrode of SCR is also by a resistance R ₁And join with the end of a neon tube Ne, the control utmost point of SCR also links to each other with this end of Ne, and the other end A of Ne waits to connect.

When the utility model uses, by the user A end of Ne is used lead UNICOM with the metal object (as door lock, handle, safety cabinet or ad hoc hardware) that must set up defences, when certain position of human body (as hand) when these metal objects, owing to the electric capacity effect of human body makes the neon tube conducting, like this in resistance R ₁Thereby two ends produce a voltage signal and trigger the controllable silicon SCR conducting, and signalling alarm equipment SET powers alarm.Directly using under the situation of civil power, after the human body trigger pip disappears, because the two-way flow feature of alternating current makes SCR end, alerting signal is interrupted, if what use is direct supply (as civil power earlier through rectification), in case then SCR is triggered after the conducting, no matter whether trigger pip disappears, SCR will keep conducting state always, and alerting signal also will be constantly till power cutoff.Therefore it also can be used as the consuming device that inductive switch starts available direct current supply.

Resistance R ₁Preferably use variable resistor, thereby make the sensitivity of this device, i.e. induction between human body and the contact triggers distance can pass through R within the specific limits ₁Regulate control.

Preferably be connected in series a resistance R between neon tube A end and the metal object of setting up defences (contact) or at the other end of neon tube ₂, be used for limiting the electric current that passes through when human body is run into the contact.

Compare with prior art, advantage of the present utility model and good effect are:

1, human body near or run into the contact and can trigger warning, be quick on the draw, reliably, and be easy to make sensitivity can regulate as required.

2, warning power can be very big.

3, can connect multiple conducting wires from the A point, the contact is arranged at many places, the scope of setting up defences is wide.The contact can utilize original metal parts (but must insulate with the earth) of house or protected object, thereby is difficult for by other people identification and simple.No matter whether human body all can trigger warning circuit with the earth insulation, nothing safe in utilization is got an electric shock dangerous.

4, circuit is simple, cost is low, be easy to producing and selling.

The utility model is of many uses, and is practical.As can be used for the apartment of many resident families, the unit dormitory burglar alarm that especially is provided with duty room (can be arranged at signalling alarm equipment in the duty room during use.Power switch is arranged at outdoor shelter); Can be used for the resident family that room and other room partitionings open or inhabit ground floor or the resident family of attic to the burglar alarm at night of balcony door and window passage; Also can be used for door and window, safety cabinet, file cabinet and the shop of storehouse, office, the burglar alarm of exhibition center's exhibit; The touch challenge switch that also can be used as patient is used for hospital ward (because of it is more sensitiveer and convenient than common bell switch); Or the like.

Fig. 1 is the electrical schematic diagram of embodiment 1.

Fig. 2 is the electrical schematic diagram of embodiment 2.

Fig. 3 is the electrical schematic diagram of embodiment 3.

Embodiment 1: see Fig. 1, the anode of controllable silicon SCR and warning load SET join, and K switch can be turn-offed civil power live wire, R ₁Be variable resistor, neon tube Ne is connected to current-limiting resistance R ₂SCR is the 1A400V one-way SCR, R ₁Be 50K adjustable resistance, R ₂Be 220K, Ne is the electroprobe neon tube, and SET is common electric bell of 220V or 100W bulb.

Embodiment 2: see Fig. 2, for increase a light emitting diode (or a neon tube) LED and resistance R in the circuit of embodiment 1 ₂, use as the energising of this device indication.R ₃Resistance is 100K.

Embodiment 3: see Fig. 3, by diode D ₁～D ₄The bridge rectifier circuit and the filter capacitor C that form become alternating current into unidirectional Rectified alternating current.D ₁～D ₄Model is 1N5407, and C is 10 μ F450V.All the other elements are identical with embodiment 1.

Claims

1, a kind of inductive theft-proof alarm, it is characterized in that: the anode of a controllable silicon SCR links to each other with the positive pole that the ground wire or of civil power is higher than the direct supply of neon tube starting voltage by warning load SET and the negative electrode of SCR links to each other with the negative pole of civil power live wire or above-mentioned direct supply, also can allow the negative electrode of SCR link to each other with the negative pole of civil power live wire or above-mentioned direct supply and the anode of SCR directly links to each other with civil power ground wire or dc power anode by SET, under this external above-mentioned any situation, the negative electrode of SCR is also by a resistance R ₁And join with the end of a neon tube Ne, the control utmost point of SCR also links to each other with this end of Ne, and the other end A of Ne waits to connect.

2, burglar alarm as claimed in claim 1 is characterized in that R ₁Be variable resistor, a neon tube Ne and a current-limiting resistance R ₂Serial connection.

3, burglar alarm as claimed in claim 2 is characterized in that being connected to the LED that usefulness is indicated in an energising.

4, burglar alarm as claimed in claim 3 is characterized in that used direct supply is for being got by rectification by civil power.