CN2172503Y - Passive human body infrared alarming device - Google Patents

Abstract

The utility model relates to an alarm, which is composed of a human body infrared probe and a multifunctional alarm. Infrared ray with 0.3-10Hz which is sent out when a person moves is received by optical focusing, the infrared ray passes through a pre-amplifier (3), passive band-pass filter network (4), an active band-pass filter (5), an adjustable amplifier (6), a window comparator (7), etc., the multifunctional alarm is started and alarm signals are sent out by the preset mode. The utility model is easy to extend. The utility model can be connected with other devices, such as a voice recorder, a video recorder, a telephone, etc., and can also be used as one unit of a centralized monitoring system by adopting a few common elements whose cost is low. The utility model has the advantages of high reliability, easy manufacture, and low cost.

Description

Passive human body infrared alarming device

The utility model relates to a kind of warning device.

Before the eighties, all kinds of security protection electronic equipments on the international market are nearly all based on technology such as ultrasound wave, active infrared line, microwaves.After the eighties, adopted electrothermic type passive infrared sensing technology in the external advanced security protection electronic equipment.This technology is owing to adopt passive acceptance human body infrared, has flexible for installationly, and good concealment can be differentiated advantages such as human body and other object.Two kinds of typical circuit structures of passive type infrared eye in " electronics newspaper " 90 year the 16 phase " passive type infrared anti-theft alarm device " literary composition and " electronics newspaper " 90 year the 48 phase " U.S.'s Passive Infrared Detector analysis " literary composition, have been introduced.This class detector key link has optical focusing system, sensor, active power filtering, amplifier, comparator circuit.The major defect that adopts this structure is the interference that can not get rid of stronger high frequency-infrared signal, because active filter is based on amplifying signal, signal beyond the passband is not amplified, but also unattenuated, can produce misoperation when for example near detector, daylight lamp glow starting being arranged.In " electronics newspaper " 91 year 20 phase " the infrared little structure assembly of half-open pyroelectricity human body " literary composition, introduced another kind of passive type human body infrared detector, its major defect is that faint human body infrared induction signal is subjected to the decay of passive filter too big, sensitivity can not get guaranteeing circuit instability when the gain of active filter is excessive.In addition, above-mentioned detector sensitivity is non-adjustable, the multiple supervision of incompatibility place.Alarm of the prior art is mainly reported to the police with sound, light dual mode, and adopts relay to carry out actuation of an alarm more, function singleness, and power consumption is big, the cost height.

The purpose of this utility model is the defective at above-mentioned infrared eye, designs a kind ofly can get rid of that strong high frequency-infrared disturbs, and the adjustable passive type infrared eye of monitoring sensitivity.Multifunction alarm device of the present utility model also should have the memory of warning, warning timing, the functions such as audible alarm, warning locking of delay time/not delaying time except that having the sound and light alarm mode.And in topworks, save relay, thereby play the effect that reduces power consumption and cost.

The utility model is made up of human body infrared detector and multifunction alarm device.To achieve these goals, between the sensor of existing human body infrared detector and active filter, a prime amplifier ［ a 3 ］ (see figure 1) and a passive bandpass filters ［ 4 ］ are set, existing amplifier are changed into the amplifier ［ 6 ］ of adjustable gain.The 0.3--10Hz infrared ray that movement human sends is focused on the human-body infrared sensing device ［ 2 ］ by optical focusing system ［ 1 ］, produce faint fluctuation level, prime amplifier ［ 3 ］ through the cascade that matches amplifies, select the signal of 0.3--10Hz then by the passive filter ［ 4 ］ of cascade, the signal beyond this frequency band is decayed significantly.Further filtering and the signal of 0.3--10Hz is amplified to a certain degree of the active filter ［ 5 ］ that the signal of passive filter ［ 4 ］ output is delivered to cascade with it again, realize sensitivity control through the adjustable amplifier ［ 6 ］ of cascade then, at last by the window comparator of cascade this signal level relatively, alert signal is put in output.

In the multifunction alarm device of the present utility model, be provided with a register ［ 9 ］ and a working storage ［ 10 ］, its input end all links to each other with control circuit ［ 8 ］, is used for the alert signal of putting that storage control circuit sends here.Put alert signal, the control of the controlled level CON of control circuit ［ 8 ］ by what control circuit ［ 8 ］ received that the human body pyroscan sends.The output terminal of register ［ 9 ］ links to each other with warning memory circuit ［ 11 ］, warning timing circuit ［ 12 ］, warning output circuit ［ 13 ］ and warning and delaying circuit ［ 18 ］ respectively, finishes various warning functions.The output terminal of working storage ［ 10 ］ directly links to each other with a trigger end of timing audible alarm circuit ［ 14 ］, and regularly another trigger end of audible alarm circuit links to each other with warning and delaying circuit ［ 18 ］, finishes the audible alarm function.Regularly the reset signal of audible alarm circuit ［ 14 ］ generation links to each other with a reset terminal of working storage ［ 10 ］ by the delay circuit that resets ［ 17 ］, finishes repeatedly warning function.In addition, another reset terminal of the reset terminal of register ［ 9 ］ and working storage ［ 10 ］ all links to each other with the output terminal of locking/reset circuit ［ 15 ］ with start delay circuit ［ 16 ］, finishes locking/reset function and start delay function.

When multifunction alarm device has the control end CON that puts alert signal input and control circuit ［ 8 ］ to be in enable level, this puts alert signal and is deposited in register ［ 9 ］ and working storage ［ 10 ］ respectively, and finish following action: 1. drive warning memory circuit ［ 11 ］, produce warning memory signal (as driving blinking light) by the alert signal of putting that register ［ 9 ］ is deposited.2. start warning timing circuit ［ 12 ］, record is reported to the police and is taken place constantly.3. drive output circuit ［ 13 ］, produce output signal, start various antitheft actuating units,, or be sent to the Centralized Monitoring chamber as the video etc. of recording.4. deliver to regularly audible alarm circuit ［ 14 ］ after will putting alert signal lag by warning and delaying circuit ［ 18 ］.Working storage ［ 10 ］ is deposited puts alert signal, directly is sent to regularly audible alarm circuit ［ 14 ］, regularly audible alarm circuit receive at the same time from register ［ 9 ］ and working storage ［ 10 ］ put alert signal the time, the startup audible alarm sends chimes of doom.Simultaneously, regularly audible alarm circuit ［ 14 ］ sends reset level, by the delay circuit that resets ［ 17 ］ working storage ［ 10 ］ is resetted, for next audible alarm is got ready.After chimes of doom sent five minutes (this time can be set), regularly audible alarm circuit ［ 14 ］ was closed automatically.But report to the police memory circuit ［ 11 ］ with display alarm situation always this moment; Warning timing circuit ［ 12 ］ has write down reports to the police constantly; Output circuit is exported alerting signal; The alert signal of putting that is sent by register ［ 9 ］ maintains a regularly input end of audible alarm circuit ［ 14 ］.If the invador enters in the scope that human body infrared detector monitors once more, put alert signal and will through control circuit ［ 8 ］ working storage ［ 10 ］ be deposited in once more to put alert signal by what human body infrared detector produced, and be sent to regularly audible alarm circuit ［ 14 ］, audible alarm sounds once more, is repeatedly reported to the police by inferior the realization.

Implement control for the duty to alarm, the utility model also is provided with following control circuit: 1. the delay circuit ［ 16 ］ of starting shooting.Started shooting one minute in, this circuit sends reset level, makes register ［ 9 ］ and working storage ［ 10 ］ be in reset mode, and alert signal is put in rejection, establishes alert personnel and has grace time to withdraw from monitoring section thereby make.After one minute, reset level disappears, and device enters the guard state.2. locking/reset circuit ［ 15 ］.When the set switch of this circuit that closes, this circuit produces reset level, and register ［ 9 ］ and working storage ［ 10 ］ are resetted.And by register ［ 9 ］ memory of will reporting to the police, warning timing, output circuit and the alert signal removal of putting of delivering to regularly audible alarm circuit ［ 14 ］.If switch closes always, to put alert signal and can't deposit register ［ 9 ］ and working storage ［ 10 ］ in, alarm is in blocking, can make things convenient for the interim access detection of household district.And after the switch opens, alarm recovers the guard state.3. control circuit ［ 8 ］.If the set control end CON of this circuit imports not enable level, then to put alert signal and can not pass through control circuit ［ 8 ］, this moment, warning device was in blocking.Can realize many-one control by this control end, also it can be linked to each other with door lock, or by centralized control room input control level.

The utility model compared with prior art has tangible advantage and practical function.Because adopt preposition amplification and passive, active two-stage filtering, making the existing higher sensitivity of the utility model has stronger antijamming capability again, reliability is higher.Sensitivity is adjustable, makes the utility model can be applicable to the different places that monitor.The utlity model has the warning memory function, help in time finding thievery; Have the warning clocking capability, help providing detection burglar clue; Have time-delay audible alarm function, help the scene and arrest the robber; Audible alarm is repetitive operation repeatedly, follows the tracks of the robber and report to the police, thereby stop the robber to commit a crime to such an extent that be; Have the locking reset function, strengthened control, normal personnel can freely be active in be monitored the place and not produce wrong report warning device.Have control, output interface, be easy to expanded function,, also can be used as a unit of centralized monitoring system as control door lock, video recording equipment etc.Owing to do not adopt relay, reduce cost in the alarm, reduced power consumption.

The utility model has following accompanying drawing:

Fig. 1 is the electrical principle block scheme of the human body infrared multifunctional warning device of passive type.Wherein A partly is a human body pyroscan electrical principle block scheme, and B partly is a multifunction alarm device electrical principle block scheme.In the drawings:

［ 1 ］---optical focusing system ［ 2 ］---current pyroelectric infrared sensor ［ 3 ］---preamplifier ［ 4 ］---passive bandpass filters ［ 5 ］---active band-pass filter ［ 6 ］---adjustable amplifier ［ 7 ］---window comparator ［ 8 ］---control circuit ［ 9 ］---register ［ 10 ］---buffer ［ 11 ］---warning memory circuit ［ 12 ］---alarm timer circuit ［ 13 ］---output circuit ［ 14 ］---timing-sound warning circuit ［ 15 ］---locking/reset circuit ［ 16 ］---start delay circuit ［ 17 ］---reset delay circuit ［ 18 ］---warning and delaying circuit CON---control end OUT---output

Fig. 2 is the human body infrared detector electrical schematic diagram.In the drawings:

L---Fresnel Lenses S---electrothermic type infrared sensing element.

Fig. 3 is the multifunction alarm device electrical schematic diagram

D7---locking/homing light D8------warning memory indicator IN---input end OUT---output terminal CON---control end T---the physical culture electronic watch of establishing alert pilot lamp D9

Fig. 4 is a DC-AC two-use power sourced electric schematic diagram

D16---AC power pilot lamp

Be embodiment of the present utility model below, and in conjunction with the accompanying drawings the utility model done further detail explanation:

The 0.3-10Hz infrared ray that movement human sends is focused on ［ 2 ］ thermoelectric infrared sensing element S by ［ 1 ］ the Fresnel Lenses L in the human body infrared detector shown in Fig. 2 electrical schematic diagram, induce faint fluctuation level, through T1 is that the prime amplifier ［ 3 ］ that core is formed amplifies, deliver to then by C3, C4, R5, the passive bandpass filters ［ 4 ］ that R6 forms is carried out filtering, the passband of this wave filter ［ 4 ］ is set to 0.3-10Hz, with the neighbourhood noise elimination beyond the passband, at this moment, because passive filter ［ 4 ］ has bigger decay to signal, need to amplify once more.With A1 is that the centre frequency that core constitutes is the active band-pass filter ［ 5 ］ of 5Hz, on the one hand to signal filtering once more, and certain gain that other aspect obtains signal.Because the cause of stability, this gain per stage should not be provided with too big.Further amplifying by A2 is that the adjustable amplifier ［ 6 ］ that core constitutes realizes that this level is provided with the third gear negative feedback resistor, switches the sensitivity of control detector by K switch 1.Sensitivity is the highest when K1 places 1, owing to select R16 greater than R17, switch places sensitivity in 3 o'clock minimum.By A3, A4, and D1, D2, constitute window comparator ［ 7 ］, the signal of A2 output is carried out the out-of-limit comparison of upper and lower limit, its bound level depends on the intrinsic standoff ratio of R18, R19 and R21, R20.The O end is high level when the output level of A2 is out-of-limit.Because the sensitivity meeting at temperature thermoelectric infrared sensing element during near body temperature descends, therefore be provided with the thermo-sensitive resistor R9 of negative temperature coefficient, when temperature raises at the negative terminal of A1, the R9 resistance descends, the A1 negative feedback weakens, and gain improves, thereby guarantees detector sensitivity.

In multifunction alarm device electrical schematic diagram shown in Figure 3, HF1-HF4 is the CMOS four nor gate, and F1-F6 is the CMOS hex inverter.The rest-set flip-flop that HF1, HF2 constitute is as register ［ 9 ］, and the rest-set flip-flop that HF3, HF4 constitute is as working storage ［ 10 ］.F1, R26, C16 constitute start delay circuit ［ 16 ］, and F2, F3, R30, C17 constitute warning and delaying circuit ［ 18 ］, and F4, F5, R33, C19 constitute the delay circuit ［ 17 ］ that resets.NE555 and KD9561 constitute regularly audible alarm circuit ［ 14 ］.Constitute warning timing circuit ［ 13 ］ by physical culture electronic watch T and R40, R41.

During start, by the start delay circuit ［ 16 ］ that F1, R26, C16 constitute, exported high level in one minute, make that Q1 is a low level, no matter input end has or not is put alert signal, and Q1 all is locked in low level.Simultaneously, hold through the Sb that D3 delivers to FH3, make by the high level of F1 output

Be low level, the rest-set flip-flop that makes FH3, FH4 constitute is in the triggering state of waiting for.Because the low level of Q1 is in reset mode by the anti-phase NE555 of making of two-stage, no matter whether put alert signal in this minute Q2 is changed to low level, NE555 all can not be triggered.In addition, the high level that F1 exported in a minute drives bright light emitting diode D8 through T2, and indicating circuit is in establishes alert state, establishes alert personnel and can not produce actuation of an alarm in the free activity of monitoring section.

Start shooting after one minute, the F1 output low level, D8 extinguishes, and register ［ 9 ］ and working storage ［ 10 ］ are all by opening, and from then on alarm is in the guard state.When nothing was put the input of alert signal, Q1 ' was a low level.Q2 is a high level, and NE555 is in closed condition.When putting the input of alert signal, two rest-set flip-flops upsets, opposed alert signal is deposited, and this moment, Q1 became high level, and Q2 becomes low level.Can the low level of Q2 directly acts on the trigger end of NE555, produce the reset terminal that audible alarm depends on NE555 but trigger NE555 this moment.The warning and delaying circuit ［ 18 ］ that constitutes by R30, C17, F2, F3, the time that makes Q1 become this high level that high level obtains to the reset terminal of NE555 can be selected between 0.5 second or 6 seconds, make that like this audible alarm has delay function, this function helps the scene and arrests the thief.When Q1 becomes high level, light emitting diode D9 is driven bright by T3, because the rest-set flip-flop (register ［ 9 ］) that HF1, HF2 form just no longer resets once set, D9 is driven no longer to be extinguished after bright, therefore but this lamp indicating alarm device once had actuation of an alarm, both realized memory function, simultaneously also as a kind of actuation of an alarm when long.Aspect in addition owing between Q1 and the Q1 ' there is a time difference, can be used to start physical culture electronic watch T and carries out the function that clocks: at first by Q1 the MODE of physical culture electronic watch T is placed the stopwatch time status, start timing by Q1 again.

NE555, R37, C21 form 5 minutes timing circuits, when 2 ends are low level and 4 ends when being high level, regularly start, and 3 ends output 9V voltage, this driven KD9561 produces audible alarm, and after 5 minutes, 3 ends revert to OV, close audible alarm.Because NE555 must just can close when 2 ends are high level, be provided with the delay circuit of forming with F4, F5 that resets ［ 17 ］ for this reason, when the 3 end output voltages of NE555, by this delay circuit ［ 17 ］, the rest-set flip-flop (working storage ［ 10 ］) that HF3, HF4 are constituted places the triggering state of waiting for, do not have when having only NE555 to carry out closing motion and put alert signal input, audible alarm just can stop.

The utility model also is provided with the locking/reset circuit ［ 15 ］ that constitutes with AN21, AN22 locking key and D7, R25.When AN pressed, C16 discharged into OV, and Q1 and Q1 ' are low level, and warning device can not trigger, and made the normal personnel monitoring section of can coming in and going out safely, and AN opens, and warning device starts after 1 minute once more.Output terminal OUT and control end CON that this circuit is designed can be used to constitute centralized monitoring system, and when circuit was in alarm condition, Q1 ' was through the T4 output low level.During control end CON short circuit, put register ［ 9 ］ and working storage ［ 10 ］ that alert signal can not be input to alarm.

Fig. 4 is a DC-AC two-use power sourced electric schematic diagram.Because the sensitivity of human body infrared detector is very high, requires power supply highly stable.Therefore adopt the two-stage voltage stabilizing, power separately by the stable 5V voltage of C end output.Two integrated packages of four nor gate in the alarm and hex inverter work in digital form, and are less demanding to power quality, adopt directly by R44 dividing potential drop power supply (B end).Consider that each light emitting diode, NE555, KD9561 power consumption under alarm condition is relatively large, adopt by the A end and directly supply with the 9V power supply.

The utility model owing to can adopt cheap a small amount of universal component, is installed easily and is produced, and functional price can be used for family separately than high, also can with the centralized monitoring system interface, use flexibly.Be easy to popularize.

Claims (5)

1, the human body infrared multifunctional warning device of a kind of passive type is made up of human body infrared detector of passive type and multifunction alarm device,

In the passive type human body infrared detector, comprise:

Optical focusing system [1] is used to assemble the infrared ray that human body sends,

Current pyroelectric infrared sensor [2] places the focus place of above-mentioned focusing system [1], finishes opto-electronic conversion,

Active band-pass filter [5], level is coupled to above-mentioned current pyroelectric infrared sensor [2], and the 0.3～10Hz infrared signal leaching that is used for human body is sent is also amplified,

Window comparator [7], level is coupled to above-mentioned active band-pass filter [5], finishes out-of-limit differentiation,

In multifunction alarm device, comprise:

Control circuit [8] is used for control and puts alert signal input,

Warning memory circuit [11], regularly audible alarm circuit [14] is used to discern alarm condition,

Output circuit [13] is used to drive burglary-resisting installation,

Of the present utility modelly be characterised in that it also comprises:

In the passive type human body infrared detector:

Prime amplifier [3] and passive bandpass filters [4] that mutual cascade is arranged between current pyroelectric infrared sensor [2] and active band-pass filter [5], described prime amplifier [3] and current pyroelectric infrared sensor [2] cascade, described passive bandpass filters [4] and active band-pass filter [5] cascade, the ultra-weak electronic signal of finishing current pyroelectric infrared sensor [2] induction amplifies, and undesired signal decayed

Adjustable amplifier [6] and their cascades are arranged between active band-pass filter [5] and window comparator [7], are used for sensitivity control,

In multifunction alarm device:

Register [9] links to each other with control circuit [8], and be used to deposit put alert signal, and drive warning memory circuit [11], warning timing circuit [12], output circuit [13], and control timing audible alarm circuit [14],

Working storage [10] links to each other with control circuit [8], and the reset signal control that produced by audible alarm circuit [14], is used for the temporary alert signal of putting, and controls regularly audible alarm circuit [14].

2, the human body infrared multifunctional warning device of passive type according to claim 1 is characterized in that the passband of the passive bandpass filters ［ 4 ］ in the human body red line detector is 0.3～10Hz.

3, the human body infrared many kinetic energy warning device of passive type according to claim 1, it is characterized in that timing audible alarm circuit ［ 14 ］ in the multifunction alarm device receive at the same time from register ［ 9 ］ and working storage ［ 10 ］ put alert signal the time just start and send the sound.Produce reset signal simultaneously by the put alert signal removal of delay circuit ［ 17 ］, and close automatically at setting-up time after regularly audible alarm circuit ［ 14 ］ sends the sound working storage ［ 10 ］.

4, the human body infrared many kinetic energy warning device of passive type according to claim 1, it is characterized in that the started shooting control of delay circuit ［ 16 ］ and locking/reset circuit ［ 15 ］ of register ［ 9 ］ in the multifunction alarm device and working storage ［ 10 ］, between the start time delay and under the locking reset mode, above-mentioned register ［ 9 ］ and working storage ［ 10 ］ refusal are deposited and are put alert signal.

5, the human body infrared multifunctional warning device of passive type according to claim 1 is characterized in that the register ［ 9 ］ in the multifunction alarm device links to each other with a warning timing circuit ［ 12 ］, has the record warning function constantly takes place.

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