CN2152255Y - Passive infrared safety alarm indicating board - Google Patents

Abstract

The utility model provides a passive safety alarm indicating board, which is composed of a mark board and a circuit, wherein, the mark board is provided with the grating-shaped window of a sensor, a character flashing and displaying window, and a loud-speaker window for alarming with speech; the circuit comprises a thermoelectric infrared sensor, a voltage amplifying circuit for amplifying sensor signals, a voltage comparing circuit, a delay circuit, an electronic switching circuit, a character displaying circuit which is driven by a multi-resonant oscillating circuit, and/or a speech alarm circuit. The utility model has the advantages of high sensitivity, high anti-interference power, and wide control range. The utility model can effectively identify organisms and non organisms, and can generate character flashing and displaying signals and speech alarm signals at the same time.

Description

Passive infrared safety alarm indicating board

The utility model belongs to safety alarm device, is specifically related to a kind of security alarm direction board that the infra-red heat electric transducer carries out detection alarm of using.

At present, when power supply department interruption maintenance high-tension line or factory's interruption maintenance visual plant, cause the accidents such as damage of personal injury and equipment for preventing false switching, the general practice is that the district hangs label in that the power supply disconnecting link is other or Keep Clear-High Voltage.But this label can not cause people's attention sometimes, and accidents such as personal injury and device damage happen occasionally.For this reason, also the someone has designed the safety alarm device that adopts active infra-red line or other electronic technology to make, but these devices all can not be differentiated biosome and other inorganic matter of motion, and also inconvenience is flowed and laid.

The purpose of this utility model is to provide a kind of can differentiate biosome and inorganic matter effectively, the text-to-speech security alarm direction board that can flow and lay.

Passive type security alarm direction board of the present utility model is made of label and circuit two parts, the voltage amplifier circuit that the literal flicker window that the grid shape window of sensor is arranged on the described label and be made of light-emitting component and the loudspeaker window of audio alert, described circuit comprise pyroelectric infrared sensor, amplify sensor signal, voltage comparator circuit, delay circuit, electronic switching circuit, the literal flicker display circuit and/or the voice alarm circuit that drive by multi-resonant oscillating circuit.

Described literal flicker display circuit can adopt light emitting diode or neon bulb to make light-emitting component.

Adopt the designed the utility model security alarm direction board of up-to-date passive type infra-red heat electric transducer, have highly sensitive, strong interference immunity, the advantage that range of control is big, can in the 2-3 rice radius of 110 degree sector regions, differentiate biosome and inorganic matter effectively, and can produce literal flicker demonstration and audio alert signal simultaneously, the generation of accidents such as personal injury and device damage is avoided in the great attention of submitting passerby to.This direction board can arbitrarily be placed or hang, thereby can be applicable to the place that all need carry out security alarm.

Embodiment of the present utility model is described in detail by accompanying drawing given below.

The infrared security alarm direction board of the passive type circuit block diagram that Fig. 1 the utility model proposes for basis.

Fig. 2 is circuit theory diagrams.

Fig. 3 is an outside drawing.

Shown in Figure 2 as Fig. 1, circuit of the present utility model comprises sensor circuit 1, voltage amplifier circuit 2, double-limit comparator circuit 3, delay circuit 4, electronic switch control circuit 5, multi-resonant oscillating circuit 6, literal flicker display circuit 7 and sound circuit 8.The core component of this circuit is a pyroelectric infrared sensor, and it is the optical filtering wafer of 7-10 μ m that this sensor has a cutoff wavelength, corresponding with human body infrared centre wavelength 9-10 μ m, plays the bandpass filtering effect, thereby human body and other object areas are separated.It can detect the infrared ray change energy that gives off with the noncontact form from human body, and it can be become electric signal output.Therefore, it does not need infrared emitter and various active contact-making switch, just can realize heat-electricity conversion.This circuit is work like this: when the people is movable in the security area, thermoelectric pickup 1 is just exported a faint voltage signal, this signal is directly coupled to the voltage amplifier circuit 2 that is made of low frequency operational amplifier integrated package, and two-stage is amplified after capacitor C is sent to the dual-electricity-limiting pressure ratio and carried out current potential relatively than circuit 3.This circuit is provided with two reference voltages, whether the signal voltage that can be used to judge input is between two appointed threshold current potentials, when the voltage signal of input exceeds the appointed threshold current potential, comparator circuit output high level is (during static state, be output as low level), full conducting, the triggering delay circuit 4 output high level of closing of BG1.Delay circuit is the monostable time delay circuit that is made of integrated package, controlled by comparator circuit, when the comparator circuit output low level, this circuit is output low level also, when comparator circuit output high level, this circuit output high level makes electronic switch control circuit 5 work that are made of BG2, BG3, three transistors of BG4.BG2, BG3, BG4 are cut-off state when static state, above-mentioned crystal is guaranteed adequate food and is closed conducting when delay circuit output high level, the multi-resonant oscillating circuit 6 that direct supply is added to constitute by time base circuit and peripheral cell, the multi-resonant oscillating circuit starting of oscillation, drive makes the literal flicker, simultaneously by literal flicker display circuit 7 work that light emitting diode or neon bulb constitute, power supply is added to sound circuit 8 after by R1 and R2 dividing potential drop, with and the identical language or the music alarm of literal of flicker.Literal flicker display circuit and voice alarm circuit can adopt simultaneously, also can select for use respectively, as only reporting to the police with audio alert or literal flicker, then as long as electronic switch control circuit is only connect voice alarm circuit or literal flicker display circuit can be realized.Above-mentioned each circuit unit provides direct-current working volts by power supply 9.

Circuit part of the present utility model sensor when specific design can be selected for use from the pyroelectric infrared sensor of U.S.'s import, and voltage amplifier circuit, comparator circuit, delay circuit and multi-resonant oscillating circuit all can adopt commercially available integrated package such as LM393, LM358, LM555 etc. to constitute foregoing circuit.Light-emitting component in the literal flicker display circuit can also can be selected neon bulb for use with light emitting diode.Sound circuit can adopt three seconds language circuit in up-to-date release user language is solidificated in, and also can use commercially available various music or sound circuit piece, and foregoing circuit is connected output alarm voice behind the loudspeaker.Circuit part is encapsulated in the label the inside, and the profile of label has sensor window 10 as shown in Figure 3 on it, literal flicker display window 11 and alarm speaker window 12.Label can be used plastic production.

Claims (2)

1, a kind of passive type security alarm direction board, constitute by label and circuit two parts, it is characterized in that having on the described label grid shape window, the literal flicker display window of sensor and the loudspeaker window of audio alert, the voltage amplifier circuit 2 that described circuit comprises pyroelectric infrared sensor 1, amplify sensor signal, voltage comparator circuit 3, delay circuit 4, electronic switching circuit 5, the literal flicker display circuit 7 and/or the voice alarm circuit 8 that drive by multi-resonant oscillating circuit 6.

2, Police Alarm as claimed in claim 1 is characterized in that the light-emitting component in the described literal display circuit can be light emitting diode or neon bulb.

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