CN2314413Y

CN2314413Y - Alarm for dropping into water

Info

Publication number: CN2314413Y
Application number: CN 97247709
Authority: CN
Inventors: 王训华; 石友仁; 何山
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-05
Filing date: 1997-11-05
Publication date: 1999-04-14
Anticipated expiration: 2007-11-05

Abstract

The utility model relates to an alarm for dropping into water, which is characterized in that the utility model comprises a signal detection circuit which is composed of a humidity-sensitive fork finger, a divider resistance and a triode, wherein, one end of the humidity-sensitive fork finger is connected with a positive electrode of power supply, one path of the other end of the humidity-sensitive fork finger is connected with a negative electrode of power supply through the divider resistance, and the other path is connected with a base electrode of the triode; an electronic switch is composed of controllable silicon whose control electrode is connected with an emitter electrode of the triode; controllable silicon is connected in series with a power supply circuit of an acoustic-optic alarm circuit as an electronic switch. The utility model has the advantages of simple structure and reliable performance. The utility model can send out alarm of dropping into water for people and objects as required.

Description

A kind of drowning alarm

The utility model relates to warning device, more particularly, is a kind of drowning alarm that can carry out detection alarm to the signal that falls into water.

In the prior art,,, the warning device of falling into water was never arranged all still to thing no matter be to the people, owing to can not in time learn the situation of falling into water, thereby the loss that do not have caused.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and a kind of drowning alarm that the situation of falling into water is in time reported to the police is provided.

The purpose of this utility model is achieved through the following technical solutions.

Design feature of the present utility model is, adopts by wet quick interdigital, divider resistance and triode to constitute signal deteching circuit, and a described wet quick interdigital termination power positive pole, the other end are leaded up to divider resistance and connect power cathode, and one the tunnel connects transistor base; Constitute electronic switch by controllable silicon, transistor emitter connects the control utmost point of controllable silicon, is serially connected in the electric power loop of sound light alarming circuit as the controllable silicon of electronic switch.

The rate utility model is owing to adopt in its circuit structure with wet quick interdigital as the input probe, and with controllable silicon as electronic switch, thereby, bide one's time normal the grade, the wet quick interdigital open circuit that is, the complete machine power supply by and disconnected, not power consumption; In case there is alert to take place, after wet quick interdigital the getting wet, the resistance value of two interpolars reduces greatly, the controllable silicon conducting that is triggered, and sound and light alarm is devoted oneself to work, and is cut off until power supply.Simple in structure, the dependable performance of the utility model can be widely used in to the people or to the thing warning of falling into water, so that in time learn alert, reduces loss.

Fig. 1 is the utility model control circuit schematic diagram.

Fig. 2 is the utility model phonation unit circuit theory diagrams.

By the following examples, in conjunction with the accompanying drawings, the utility model is further described.

Embodiment:

Referring to accompanying drawing 1,

E:6V adopts 1.5V alkaline battery 4 joints

R: wet quick interdigital, directly on printed panel, print

R1, R2, R3: be the 1/8W carbon film

BG1:9014、β＞200

BG2:2A 400V one-way SCR

C:10 μ 25V electrochemical capacitor

D1, D2: high brightness LED, can adopt four parallel connections

As shown in Figure 1, adopt to constitute signal deteching circuit by wet quick interdigital R, divider resistance R1 and triode BG1, the quick interdigital R one termination power E positive pole that wets, the other end are leaded up to divider resistance R1 and are connect power supply E negative pole, and one the tunnel connects triode BG1 base stage.BG2 constitutes electronic switch by controllable silicon, and triode BG1 emitter connects the control utmost point of controllable silicon BG2, is serially connected in the electric power loop of sound light alarming circuit as the controllable silicon BG2 of electronic switch.

As shown in Figure 2, the sounding pattern that phonation unit adopts in the present embodiment be " toot ... toot ... toot, help " imitate siren three promptly earlier, about 1.5 seconds, exhale " help " then, also be 1.5 seconds, the cycle is 3.5 seconds altogether, sound source is provided by the musical film of special use.

In order to obtain enough loudness under the 6V low-voltage, power amplifier adopts integrated circuit BTL power amplifier, can obtain to be not less than the output power (8 Europe loudspeaker) of 3W.Each capacity cell all adopts the heat radiator of small size electrochemical capacitor, integrated package LA4192 to replace with the large tracts of land Copper Foil among the figure.

In the enforcement, the printed board total area is about 20cm, adopts dual platen, do not punch, wherein one side is pasted each element of weldering and wet quick interdigital, and another side is specialized in the LA4192 heat radiation, paste the weldering component side dehumidify quick interdigital outside, use the plastic cement sealing without exception, loudspeaker is selected anti-basin (non-cone gets final product) for use, and rear basin frame is hermetically sealed, as audio amplifier mediant trumpet commonly used, but its thickness is no more than 3cm, the about 10cm5cm ellipse of bore.

The course of work is as follows:

During waiting status, wet quick interdigital R presents open circuit, and triode BG1 does not have base current and ends, and controllable silicon BG2 turn-offs, not power consumption of complete machine.

Meet when falling into water the alert generation, wet quick interdigital R two electrode resistances are less than 10K, and the dividing potential drop of connecting with resistance R 1 makes triode BG1 base stage get electric and conducting, the conducting electric current is more than 5mA, this conducting current trigger controllable silicon transfers conducting to by shutoff, and immediately, sound and light alarm is devoted oneself to work.Because silicon controlled maintenance effect, sound and light alarm promptly has nothing to do with the state of hygristor R devoting oneself to work after, up to the people for till cutting off the electricity supply.

For the work of next time, should insert power supply more earlier with quick interdigital the drying of wetting, be waiting status.

Claims

1, a kind of drowning alarm, it is characterized in that, adopt to constitute the input electricity, described wet quick interdigital R one termination power positive pole by wet quick interdigital R, divider resistance R1 and triode BG1, the other end is leaded up to divider resistance R1 and is connect power cathode, and one the tunnel connects triode BG1 base stage; BG2 constitutes electronic switch by controllable silicon, and triode BG1 emitter connects the control utmost point of controllable silicon BG2, is serially connected in the electric power loop of sound light alarming circuit as the controllable silicon BG2 of electronic switch.