CN2031952U - Damage-proof alarm device with signal identification - Google Patents

Abstract

The utility model belongs to the field of alarm equipment. The purpose of the utility model is providing an alarm device which can excellently discriminate the alarm and the line faults. According to the need, the utility model can also discriminate the open circuit and short-circuit condition in the faults, and has the function of anti-damage. The major technique characteristics of the utility model lie in that two resistors are added at a detecting part; one resistor is added at a controlling / communicating part; the utility model adopts four divider resistors and a voltage comparator and an exclusive or gate component. The feathers of the utility model lie in that simple circuit, less element, reliable performance, low cost without need for adjusting.

Description

Damage-proof alarm device with signal identification

The utility model belongs to the panalarm field.

Be simply or complicated warning device all form by three parts: first is a probe portion, and second portion is a hop, and third part is a control/communication part.First can be made up of fire prevention probes such as various hand control switches, all kinds autodetector such as burglar alarms such as ultrasonic, infrared, microwave, pressure, vibration probe and cigarette sense, temperature senses; The used transmission line of second portion can be with open-wire line or polycore cable, and the signal that it senses probe is delivered to control section, also needs sometimes the required power supply of probe is transmitted by control section; The signal that third part is sent transmission line here is discerned, and reports detector and the residing state of circuit in the mode of light and electricity, in the time will setting up contact with computing machine or upper level control center, then needs communication function.Usually detector all is designed to have the warning function of tamper and outage, requires line failure can send fault-signal to circuit pack.Present alarm is normally used to be the loop current detection method, has plenty of simple voltage relative method, and the signal of probe output is current potential or pulse signal, and the warning of detector and the fault of circuit are difficult to difference and come.

The purpose of this utility model provides the warning device of fine identification warning of a kind of energy and line fault, can also be discerned open circuit in the fault and short-circuit condition as needs.

Description of drawings is as follows:

Fig. 1 is the circuit diagram that can show the warning device of normal, warning, open circuit, four kinds of states of short circuit.(K is in normally off)

Fig. 2 is the circuit diagram that can show the warning device of normal, warning, three kinds of states of fault.(K is in normally off)

The purpose of this utility model is achieved in that in a warning device that is made up of probe portion, hop, control/communication part at probe portion two resistance R that are attached to detector are arranged₁、R ₂, (detector does not draw in the drawings) R₁The switch that provides with manual switch or detector is in series then and R₂Be in parallel and be connected on the transmission line; Added resistance R in control/communication part₃, power supply E passes through R₃Provide test voltage to detector, R through transmission line₃With the tie point of transmission line be test point P; In order to identify the level state of test point P, adopt three voltage comparators and four divider resistances to consist of state recognition part, four divider resistance R₁、R ₂、R ₃、R ₄Be connected in after the series connection between power positive cathode E, the O, be used for producing benchmark voltage, the positive input terminal of comparator all links to each other with test point P, and negative input end links to each other with 3 of a, b, c on the bleeder circuit respectively, and the output of comparator is respectively A, B, C; In order to show the signal of identifying, four different or doors have been adopted, their concrete connection is in two kinds of situation: for the warning device that shows four kinds of states, when K switch is normally off, their output is respectively by current limliting resistance and light emitting diode ground connection, one of two input different or door (25) connect ground connection of output C of comparator, one of input different or door (23) meets one of B and meets C, one of input different or door (24) meets one of A and meets B, and one of input different or door (26) meets one of A and passes through resistance R₁₂Meet E, when being normally open, K switch only needs output A and the C of comparator are exchanged position in the wiring of different or door, for the warning device that shows three kinds of states when K switch is normally off, connection different or door (27) is identical with connection different or door (23), different or the door (28) connection with different or the door (24), and a different or input of (29) inputs of door termination A termination C, different or (30) inputs of door termination is different or the output of door (29) another pass through resistance R₁₅Meet power supply E, its output is also by current limliting resistance and light emitting diode D₅Ground connection.

Be described in detail the course of work of the present utility model below in conjunction with Fig. 1.In Fig. 1, can set R ₂=3R ₁, R ₃=1.5R ₁R ₄=R ₅=R ₆=R ₇The reference voltage V at a place like this _a=1/4 E, the b place be V _b=2/4 E, the c place be V _c=3/4 E.We arrange K is normally off.When panalarm is in normal condition: the voltage V of check point P _N=E

=1/3 E, obviously V _a＜V _N＜V _b＜V _c, the output terminals A of comparer this moment (20) is 1, and the output terminal B of comparer (21) is 0, the output terminal C of comparer (22) is 0, concerning XOR gate (25) thus two input ends because be connected on C, 2 be 0,0, thereby output terminal is 0, light emitting diode D ₃Can not work; Concerning XOR gate (23) thus this moment two input ends because being connected on B, C at 2 is 0,0, thereby output terminal is 0, light emitting diode D ₁Can not work; Concerning XOR gate (26), this moment, two input ends were because be connected on A and pass through resistance R ₁₂Go up and to be 1,1 so be connected on power supply E, thereby output terminal also is 0, light emitting diode D ₄Can not work; Have only its input end of XOR gate (24) to be connected on A, the B and think 1,0, thereby output terminal is 1, cause light emitting diode D ₂Work shows luminous (with green).Analyze thus and find out normal condition and D ₂Luminous one-tenth one-to-one relationship.When K switch is in open mode when panalarm is in alarm condition, the voltage V of check point P _A=E (R ₂)/(R ₂+ R ₃)=2/3 E, obviously V _a＜V _b＜V _A＜V _c, the output terminals A of comparer is 1, and B is 1, and C is 0.To XOR gate (25) input end is (0,0), and output terminal is 0, D ₃Not luminous; Is 0 to XOR gate (24) input end for (1,1) output terminal, D ₂Not luminous; Is 0 to XOR gate (26) input end for (1,1) output terminal, D ₄Not luminous; Having only XOR gate (23) input termination B, C is 1 for (1,0) output terminal, D ₁Work shows luminous (with red).Analyze alarm condition and D thus ₁Glow into one-to-one relationship.In like manner also can analyze circuit open-circuit condition and D ₃Luminous (commonly used yellow) becomes one-to-one relationship, line short state and D ₄Luminous (apricot commonly used) becomes one-to-one relationship.The output terminal S of XOR gate (24) also joins such as acoustics circuit with the next stage circuit, another input termination power of acoustics circuit E, and acoustics circuit mainly adds resistance R by phase inverter (31) (32) and IC556 ₁₇And capacitor C ₁, loudspeaker forms, because normal condition S is ordered and is output as 1, through phase inverter (31) (32) d point also is 1 output, being input as of IC556 (1,1) like this, loudspeaker can not be worked, and its excess-three kind state S point is all 0 output, and the d point also is 0 output, being input as of IC556 (1,0) like this, speaker operation represents that situation is unusual.For circuit shown in Figure 2, its principle of work, the course of work are roughly same as described above, repeat no more.When K switch is normally open, for Fig. 1 and Fig. 2, only need wiring A and C are exchanged, this can add the short circuit selector switch realizes that its principle of work and process also repeat no more.

Voltage comparator can adopt LM339, and XOR gate can adopt 74LS86, resistance R ₁-R ₇Can be at hundreds of ohms to value between thousands of ohms.

Most preferred embodiment: power supply E is 5 volts, R ₁=2K, R ₂=6K, R ₃=3K, R ₄=R ₅=R ₆=R ₇=2K, current-limiting resistance R ₀=100 ohm, above resistance power consumption is 1/4 W or 1/2 W, R ₁₅=R ₁₂=R ₁₇=10K, C ₁=100 μ F, comparer LM339, XOR gate 74LS86, phase inverter MC1413.

The utility model has been distinguished normally well, warning, three kinds of states of fault (when adopting Fig. 2 circuit), fault further can also be distinguished as open circuit and short circuit two states (when adopting Fig. 1 circuit), all can send respectively warning and fault-signal to the artificial destruction of detector and circuit, used element, device are all commonly used, and cost is low. So should novel can yet be regarded as of practicality be the warning device that having of economy, dependable performance is tamper-proof and signal is identified.

Claims (3)

1, a kind of warning device with the identification of tamper-proof and signal, this device is made of probe portion, hop, control/communication part, and the resistance R that probe portion has a K switch that provides with hand switch or detector to be in series is provided ₁And and R ₁The resistance R that is in parallel ₂, and R ₂=3R ₁In control/communication part a resistance R that is connected between power supply E and the check point P is arranged ₃, and R ₃=1.5R ₁, the state recognition part is by three voltage comparators and divider resistance R ₄, R ₅, R ₆, R ₇Constitute and R ₄=R ₅=R ₆=R ₇The positive input terminal of three voltage comparators all links to each other with the P point, their negative input end links to each other with a, b, c on the bleeder circuit respectively, adopt four XOR gate in order to show the signal discerned: when showing that four kinds of states and K switch are normal not busy state, one of two input end of XOR gate (25) connect ground connection of output terminal C of comparer, one of the input end of XOR gate (23) meets one of B and meets C, one of the input end of XOR gate (24) meets one of A and meets B, and one of the input end of XOR gate (26) meets one of A and passes through resistance R ₁₂Meet E, when showing that three kinds of states and K switch are normally off, the same XOR gate of connection (23) of XOR gate (27), the same XOR gate of connection (24) of XOR gate (28), one of its input end of XOR gate (29) meets one of A and meets C, and one of the input end that one of the input end of XOR gate (30) connects XOR gate (29) passes through resistance R ₁₅Meet power supply E, only need in the above-mentioned wiring when K switch is in normally open the output A of comparer and C are exchanged a upper/lower positions.

2, device as claimed in claim 1 is characterized in that voltage comparator adopts the LM339 XOR gate to use 74LS86, R ₁--R ₇Span be that hundreds of ohm is to thousands of ohms.

3, as claim 1,2 described devices, it is characterized in that R ₁=2K, R ₂=6K, R ₃=3K, R ₄=R ₅=R ₆=R ₇=2K.

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