CN102788646A - Active-type pyroelectric infrared sensor - Google Patents
Active-type pyroelectric infrared sensor Download PDFInfo
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- CN102788646A CN102788646A CN2012103154229A CN201210315422A CN102788646A CN 102788646 A CN102788646 A CN 102788646A CN 2012103154229 A CN2012103154229 A CN 2012103154229A CN 201210315422 A CN201210315422 A CN 201210315422A CN 102788646 A CN102788646 A CN 102788646A
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Abstract
An infrared sensor is particularly relates to an active-type pyroelectric infrared sensor and comprises a pyroelectric infrared sensor probe (6). A pyroelectric infrared sensor probe window (11) is arranged at the upper end of the pyroelectric infrared sensor probe, and the active-type pyroelectric infrared sensor is characterized in that a modulation sheet (9) is arranged on the upper portion of the pyroelectric infrared sensor probe window, the modulation sheet is fixed at the upper end of a piezoelectric driving sheet (1), the lower end of the piezoelectric driving sheet penetrates through a small hole to be fixed on a support below a base plate, the pyroelectric infrared sensor probe is connected with a signal amplification detection circuit, the output end of the signal amplification detection circuit is connected with a driving circuit, the output end of the driving circuit is connected with a piezoelectric driving circuit, the output end of the signal amplification detection circuit is further connected with an oscillating circuit, the output end of the oscillating circuit is connected with the piezoelectric driving circuit, and the output end of the piezoelectric driving circuit is connected with a modulator which corresponds to infrared radiation incoming a human body. The active-type pyroelectric infrared sensor is long in service life, low in consumption, low in cost, stable and reliable in work and capable of detecting the human body in dynamic and static states.
Description
Technical field
The present invention relates to a kind of infrared sensor, particularly a kind of active pyroelectric infrared sensor.
Background technology
Existing pyroelectric infrared sensor is owing to the reason of its structure and principle of work; Can only detect mobile human infrared radiation; In order to detect the static human body infrared radiation, the designer uses motor as power source on this basis, has adopted various modulation systems; But used modulation system exists all that volume is big, noise is big, cost is high, maintenance is complicated, the life-span is short and the high fatal shortcoming that consumes energy, and their application is restricted.Though the pyroelectric infrared sensor that exists at present provides solution route preferably for the infrared radiation that detects movement human; But the active pyroelectric infrared sensor to detecting the static human body radiation does not provide good technical solution, never obtains practicality.
Summary of the invention
According to the deficiency of above prior art, the technical matters that the present invention will solve is: provide that a kind of long service life, power consumption are extremely low, volume is little, response is fast, cost is low, easy to maintenance, working stability reliable, use flexibly, can detect the active pyroelectric infrared sensor of dynamic and static human body.
The technical solution adopted for the present invention to solve the technical problems is: a kind of active pyroelectric infrared sensor; Comprise the pyroelectric infrared sensor probe, pyroelectric infrared sensor probe upper end is provided with the pyroelectric infrared sensor probe window, it is characterized in that: the pyroelectric infrared sensor probe is installed on the substrate; Substrate is provided with aperture; Support is installed below the substrate, and piezoelectric driving plate passes aperture, and the piezoelectric driving plate lower end is fixed on the support; Piezoelectric driving plate upper end fixed modulation sheet; The modulation sheet is arranged on pyroelectric infrared sensor probe window top, and the semisphere Fresnel Lenses is set on the substrate, and Fresnel Lenses and substrate constitute an obturator; Pyroelectric infrared sensor probe lower end is provided with the pyroelectric infrared sensor probe electrode, and piezoelectric driving plate connects the Piezoelectric Driving plate electrode through the piezoelectric driving plate contact conductor;
Described pyroelectric infrared sensor probe connects the signal amplification detection circuit through the pyroelectric infrared sensor probe electrode; Signal amplification detection circuit output terminal connects driving circuit, and the driving circuit output terminal connects piezoelectric driving circuit, and signal amplification detection circuit output terminal also connects oscillatory circuit; Output end of oscillating circuit connects piezoelectric driving circuit; The piezoelectric driving circuit output terminal connects modulator, and modulator is corresponding with the incident human infrared radiation, and driving circuit connects controlled load;
Described piezoelectric driving plate connects piezoelectric driving circuit through the Piezoelectric Driving plate electrode.
The modulation sheet is a kind of infrared ray shielding plate, and the modulation sheet should be selected the lower material of emissivity for use, in order to avoid the heat radiation of modulation sheet self produces unnecessary interference.Modulate sheet to-and-fro movement under the drive of piezoelectric driving plate, periodically block two sensitive elements of pyroelectric infrared transducer in turn, pyroelectric infrared transducer adopts common pyroelectric infrared sensor; Piezoelectric driving plate adopts the piezoelectric bimorph or the single-chip of the horizontal effect of piezoelectricity, preferred piezoelectric bimorph, and driving sensitivity is high; Piezoelectric driving plate contact conductor electric conductivity and pliability are good, the bottom that is connected of lead-in wire and piezoelectric driving plate near piezoelectric driving plate, and amount of exercise is little; Mutual influence is less, and Fresnel Lenses can form visible range and blind area on pyroelectric infrared transducer, also has focussing force; Enlarged investigative range,, made inner member not receive extraneous interference with obturator of the common composition of substrate; The rigidity of support is strong, and is not yielding, the fixed support piezoelectric driving plate; During work, support is fixed, and the installation modulation sheet end of piezoelectric driving plate is reciprocating.Pyroelectric infrared transducer receives human infrared radiation output signal; Signal entering input amplification detection circuit amplifies and detects; According to delay time of setting and working method output two paths of signals; One road input driving circuit, one tunnel input oscillatory circuit, the output delay time computing formula of integrated circuit is:
TX=49152R
13C
13
Active mode was advisable with about 2 seconds, triggered blocking time to be:
Ti=24R
14C
14
Oscillatory circuit is selected NE555P for use; Piezoelectric driving plate can equivalence be an electric capacity when design; Because charging and discharging loop time constant has bigger difference; So the output signal dutyfactor of this oscillatory circuit can not adopt 1:2, oscillation frequency confirms that according to the LF-response of the pyroelectric infrared transducer of selecting for use and the output delay time of setting computing formula is as follows:
TWH=0.7（R
16+R
17）C
15
TWL=0.7R
17C
15
Wherein, TWH is the output high level time, and TWL is the output low level time.
Described piezoelectric driving circuit comprises commutation diode D1-D4; Capacitor C 1, capacitor C 2, resistance R 1-R6, switching tube Q1; Piezoelectric driving plate JZ; Commutation diode is connected live wire and zero line two ends, and capacitor C 1, capacitor C 2 two ends connect the commutation diode two ends, connect with resistance R 4, switching tube Q1, resistance R 5, resistance R 6 back branch road and be connected in the two ends of capacitor C 2 of resistance R 1-R3 series connection back branch road; Piezoelectric driving plate JZ one end connects the common port of resistance R 1 and resistance R 2, and the other end connects the common port of switching tube Q1 and resistance R 5.The 220V civil power carries out rectification through diode; After capacitor C 1, C2 filtering, produce the tributary voltage of nearly 300V, R4 is a current-limiting resistance, prevents that switching tube Q1 overcurrent damages in any case; Piezoelectric driving plate JZ branch road is not provided with any switch, in order to avoid memory effect influences system's operate as normal.
Described signal amplification detection circuit adopts BISS0001 or OT0001 signal processing integrated circuit U4, and the S utmost point of pyroelectric infrared sensor probe electrode connects 14 pin of signal processing integrated circuit U4, and 2 pin of signal processing integrated circuit U4 connect control Driver Circuit and working method configuration switch SA4; The D utmost point of pyroelectric infrared sensor probe electrode connects 9 pin of signal processing integrated circuit U4, and the G utmost point ground connection of pyroelectric infrared sensor probe electrode connects capacitor C 8 and resistance R 7 between the S utmost point and the G utmost point; Capacitor C 8 and resistance R 7 parallel connections; 16 pin of signal processing integrated circuit U4 are connected 12 pin after series capacitance C9, resistance R 9 and the resistance R 10 successively, and 13 pin connect the common port of resistance R 9 and resistance R 10, and capacitor C 10 is connected the two ends of resistance R 10; 15 pin are connected to 16 pin through resistance R 11; Resistance R 11 two ends connect capacitor C 11,15 pin series connection R12 and capacitor C 12 back ground connection, and 6 pin and 3 pin are resistance in series R14, capacitor C 14 and resistance R 13, capacitor C 13 back ground connection respectively; 5 pin connect capacitor C 14 back ground connection; 7 pin ground connection, 4 pin connect capacitor C 13 and are connected working method configuration switch SA3 with 8 pin with resistance R 13,1 pin; 11 pin are connected working method configuration switch SA4 with 8 pin one tunnel; Another road is through 3 pin of resistance R 15 with D8 access oscillatory circuit integrated timer, and 11 pin and 8 pin are through capacitor C 17 ground connection, and 11 pin are connected the integrated stabilivolt U3 of three ends with 8 pin.The BISS0001 or the OT0001 signal processing integrated circuit that adopt have independently high input impedance operational amplifier; Can mate with multiple sensors, carry out signal Processing, can effectively suppress to disturb; In establish timer and blocking time timer time delay; Novel structure, reliable and stable, range of adjustment is wide.
Described oscillatory circuit adopts NE555P, comprises 555 integrated timer U5, resistance R 16 and resistance R 17, capacitor C 15 and capacitor C 16; Be connected 6 pin after the 5 pin series capacitance C16 of 555 integrated timer U5 and the capacitor C 15; Be connected 6 pin after 8 pin resistance in series R16 and the resistance R 17,7 pin connect the common port of resistance R 16 and resistance R 17, and 2 pin connect the common port of capacitor C 15 and 6 pin; 1 pin ground connection; 8 pin connect 8 pin and 11 pin of signal processing integrated circuit U4, and 4 pin connect working method configuration switch SA4, and 3 pin connect the grid of switching tube Q1.Employing NE555P oscillatory circuit is simple in structure, expansion is convenient, and is variable flexibly, only need prepare suitable Resistor-Capacitor Unit and wiring during use and get final product.
Described control Driver Circuit comprises resistance R 18-R21; Triode Q2, triode Q3, light emitting diode D9, diode D7 and relay K A; 2 pin of signal processing integrated circuit U4 connect the base stage of triode Q2 through resistance R 19; The collector of Q2 connects working method configuration switch SA4 through resistance R 18, and triode Q2 emitter connects the base stage of triode Q3, and the base stage of triode Q3 is through resistance R 20 ground connection; Triode Q3 grounded emitter; Collector connects light emitting diode D9 and resistance R 21, and diode D7 and relay K A are connected in parallel on resistance D9 and resistance R 21 two ends respectively, and the common port of resistance R 21, diode D7 and relay K A is connected three end integrated stable voltage circuit U2.Work of control Driver Circuit drive load and driven modulator work, driving highly sensitive, light emitting diode indicating circuit duty.
The input end end of described three end integrated stable voltage circuit U2 connects rectifier bridge heap U1, and rectifier bridge heap U1 connects the 220V civil power through transformer T, and the output terminal of three end integrated stable voltage circuit U2 connects three end integrated stable voltage circuit U3.Three end integrated stable voltage circuit U2 and three end integrated stable voltage circuit U3 are 78M12 and the integrated stabilivolt of 78,L05 three ends, and loss is less relatively, save power.
The beneficial effect that the active pyroelectric infrared sensor of the present invention is had is: the modulator of said active pyroelectric infrared sensor adopts piezoelectric driving plate as power source; One end of piezoelectric driving plate is fixed; The other end is in free state and the modulation sheet is installed; The modulation sheet is installed in pyroelectric infrared sensor probe window top, is leading to low-frequency ac voltage on the piezoelectric driving plate, and then piezoelectric driving plate is done the cyclic bending motion; It is reciprocating under the drive of piezoelectric driving plate that modulate sheet this moment, thereby the infrared radiation of injecting the pyroelectric infrared sensor probe window is carried out chopping modulation.Described pyroelectric infrared sensor has no friction component, can accomplish non-maintainingly, and serviceable life is very long, and piezoelectric driving plate is a driven; It is extremely low to have power consumption, small-sized light, and response is fast, and the life-span grows up to this low advantage; And the modulation sheet can adopt papery, plastics etc. can block the ultrared thin slice of human body radiation to process, and cost is very low, and whole a series of performance index satisfy practical requirement fully; The driving circuit of piezoelectric driving plate is extremely simple, with the direct rectifying and wave-filtering of civil power alternating current 220V voltage, only accomplishes direct current to the inversion conversion that exchanges (DC-AC) with single switching tube then; Resistance R 4 is a current-limiting resistance, prevents that fault from making the electric current that flows through switch transistor T 1 excessive and burn, and adopts the considerably less circuit component of simple circuit and structure to accomplish its function; The cost of making circuit is very low, and working stability is reliable, and power consumption is very low; Particularly stop power supply during standby, its power consumption is zero, and the proper protection measure makes the life-span of circuit be able to prolong.
Description of drawings
Fig. 1 is a functional-block diagram of the present invention;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is an electrical schematic diagram of the present invention;
Fig. 4-Fig. 7 is a modulation sheet direction of motion synoptic diagram of the present invention;
Wherein: 1 (JZ); Piezoelectric driving plate 2; Piezoelectric driving plate contact conductor 3; Piezoelectric Driving plate electrode 4; Support 5; Pyroelectric infrared sensor probe electrode 6; Pyroelectric infrared sensor probe 7; Substrate 8; Fresnel Lenses 9; Modulation sheet 10; Aperture 11; Pyroelectric infrared transducer window 12; Pyroelectric infrared transducer sensitive element R1-R20; Resistance C1-C16; Electric capacity D1-D7; Diode D8-D9; Light emitting diode U1; Rectifier bridge heap U2-U3; The integrated stabilivolt circuit U 4 of three ends; Signal processing integrated circuit U5; 555 integrated timer SA1-SA4; Working method configuration switch Q1; Switching tube Q2-Q3; Triode KA; Relay T; Transformer.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are done and to be further described:
Shown in Fig. 1-7, active pyroelectric infrared sensor comprises pyroelectric infrared sensor probe 6; Pyroelectric infrared sensor 6 upper ends of popping one's head in are provided with pyroelectric infrared sensor probe window 11, and pyroelectric infrared sensor probe 6 is installed on the substrate 7, and substrate 7 is provided with aperture 10; Support 4 is installed below the substrate 7, and piezoelectric driving plate 1 passes aperture 10, and piezoelectric driving plate 1 lower end is fixed on the support 4; Piezoelectric driving plate 1 upper end fixed modulation sheet 9; Modulation sheet 9 is arranged on pyroelectric infrared sensor probe window 11 tops, and semisphere Fresnel Lenses 8 is set on the substrate, and Fresnel Lenses 8 constitutes an obturator with substrate 7; Pyroelectric infrared sensor 6 lower ends of popping one's head in are provided with pyroelectric infrared sensor probe electrode 5, and piezoelectric driving plate 1 connects Piezoelectric Driving plate electrodes 3 through piezoelectric driving plate contact conductor 2;
Described pyroelectric infrared sensor probe 6 connects the signal amplification detection circuit through pyroelectric infrared sensor probe electrode 5; Signal amplification detection circuit output terminal connects driving circuit, and the driving circuit output terminal connects piezoelectric driving circuit, and signal amplification detection circuit output terminal also connects oscillatory circuit; Output end of oscillating circuit connects piezoelectric driving circuit; The piezoelectric driving circuit output terminal connects modulator, and modulator is corresponding with the incident human infrared radiation, and driving circuit connects controlled load;
Described piezoelectric driving plate 1 connects piezoelectric driving circuit through Piezoelectric Driving plate electrode 3.
As shown in Figure 3, described piezoelectric driving circuit comprises commutation diode D1-D4, capacitor C 1, capacitor C 2; Resistance R 1-R6; Switching tube Q1, piezoelectric driving plate JZ, commutation diode are connected live wire and zero line two ends; Capacitor C 1, capacitor C 2 two ends connect the commutation diode two ends; Connect with resistance R 4, switching tube Q1, resistance R 5, resistance R 6 back branch road and be connected in the two ends of capacitor C 2 of resistance R 1-R3 series connection back branch road, piezoelectric driving plate JZ one end connects the common port of resistance R 1 and resistance R 2, the common port of other end connection switching tube Q1 and resistance R 5.
Described signal amplification detection circuit adopts BISS0001 or OT0001 signal processing integrated circuit U4, and the S utmost point of pyroelectric infrared sensor probe electrode 5 connects 14 pin of signal processing integrated circuit U4, and 2 pin of signal processing integrated circuit U4 connect control Driver Circuit and working method configuration switch SA4; The D utmost point of pyroelectric infrared sensor probe electrode 5 connects 9 pin of signal processing integrated circuit U4, and the G utmost point ground connection of pyroelectric infrared sensor probe electrode 5 connects capacitor C 8 and resistance R 7 between the S utmost point and the G utmost point; Capacitor C 8 and resistance R 7 parallel connections; 16 pin of signal processing integrated circuit U4 are connected 12 pin after series capacitance C9, resistance R 9 and the resistance R 10 successively, and 13 pin connect the common port of resistance R 9 and resistance R 10, and capacitor C 10 is connected the two ends of resistance R 10; 15 pin are connected to 16 pin through resistance R 11; Resistance R 11 two ends connect capacitor C 11,15 pin series connection R12 and capacitor C 12 back ground connection, and 6 pin and 3 pin are resistance in series R14, capacitor C 14 and resistance R 13, capacitor C 13 back ground connection respectively; 5 pin connect capacitor C 14 back ground connection; 7 pin ground connection, 4 pin connect capacitor C 13 and are connected working method configuration switch SA3 with 8 pin with resistance R 13,1 pin; 11 pin are connected working method configuration switch SA4 with 8 pin one tunnel; Another road is through 3 pin of resistance R 15 with D8 access oscillatory circuit integrated timer, and 11 pin and 8 pin are through capacitor C 17 ground connection, and 11 pin are connected the integrated stabilivolt U3 of three ends with 8 pin.
Described oscillatory circuit adopts NE555P, comprises 555 integrated timer U5, resistance R 16 and resistance R 17, capacitor C 15 and capacitor C 16; Be connected 6 pin after 5 pin series capacitance C16 of 555 integrated timers and the capacitor C 15; Be connected 6 pin after 8 pin resistance in series R16 and the resistance R 17,7 pin connect the common port of resistance R 16 and resistance R 17, and 2 pin connect the common port of capacitor C 15 and 6 pin; 1 pin ground connection; 8 pin connect 8 pin and 11 pin of signal processing integrated circuit U4, and 4 pin connect working method configuration switch SA4, and 3 pin connect the grid of switching tube Q1.
Described control Driver Circuit comprises resistance R 18-R21; Triode Q2, triode Q3, light emitting diode D9, diode D7 and relay K A; 2 pin of signal processing integrated circuit U4 connect the base stage of triode Q2 through resistance R 19; The collector of Q2 connects working method configuration switch SA4 through resistance R 18, and triode Q2 emitter connects the base stage of triode Q3, and the base stage of triode Q3 is through resistance R 20 ground connection; Triode Q3 grounded emitter; Collector connects light emitting diode D9 and resistance R 21, and diode D7 and relay K A are connected in parallel on resistance D9 and resistance R 21 two ends respectively, and the common port of resistance R 21, diode D7 and relay K A is connected three end integrated stable voltage circuit U2.
The input end end of described three end integrated stable voltage circuit U2 connects rectifier bridge heap U1, and the rectifier bridge heap connects the 220V civil power through transformer T, and the output terminal of three end integrated stable voltage circuit U2 connects three end integrated stable voltage circuit U3.
Principle of work and use:
Because the pyroelectric infrared sensor probe only could produce the output signal under the effect that changes the input human infrared radiation; And that the infrared radiation of human body is stablized is constant; So such pyroelectric infrared sensor can only be to the infrared radiation response of the human body of relative motion, and is invalid to static human body, response arranged to static human infrared radiation; Must adopt certain lasting variable quantity; Human infrared radiation to static is modulated, and the human infrared radiation of incident is among the variation, and pyroelectric infrared sensor could continue the output signal like this.The present invention adopts piezoelectric driving plate as the power drive element, uses and modulates the chopping modulation scheme that sheet blocks sensitive element periodically in turn, makes the output signal in pyroelectric infrared transducer cycle, reaches the purpose of detection.Shown in Fig. 4-7, piezoelectric driving plate has two kinds of installation sites, and the modulation sheet has two kinds of shapes, and 4 kinds of array modes are arranged.
Pyroelectric infrared transducer receives human infrared radiation and exports signal, this signal input amplification detection circuit, and amplification detection circuit is exported two paths of signals according to delay time of setting and working method: one road input driving circuit, the work of driving circuit drive load; Another road starts oscillatory circuit; Oscillatory circuit produces cycle self-sustained oscillation signal according to the working method of setting; The work of control modulation drive circuit driven modulator; Modulator is modulated the infrared radiation of incident, makes the output signal in pyroelectric infrared transducer cycle, reaches the purpose of dynamic and static human detection.
The 220V civil power produces nearly 300V DC voltage by the diode bridge rectification through capacitor C 1, capacitor C 2 filtering, when switching tube Q1 conducting; Voltage puts on piezoelectric driving plate JZ through resistance R 4, switching tube Q1, piezoelectric driving plate JZ, resistance R 2, resistance R 3 loops; This moment, piezoelectric driving plate JZ offseted to one side, and when switching tube Q1 turn-offed, voltage oppositely put on piezoelectric driving plate JZ through resistance R 1, piezoelectric driving plate JZ, resistance R 5, resistance R 6 loops; Piezoelectric driving plate JZ is to skew in the other direction; When the cut-off loop power supply, then piezoelectric driving plate JZ discharges rapidly through the loop resistance network, gets back to initial middle position.Resistance R 4 is a current-limiting resistance, prevents that switching tube Q1 overcurrent damages in any case, and operate as normal is not had influence.Piezoelectric driving plate JZ branch road can not be provided with any switch, in order to avoid its memory effect influences system's operate as normal.
During use, each working method configuration switch is in shown position among the figure, and working method configuration switch SA1 is when closing; Then circuit is in the working method of passive startup, active monitoring, and when moving human body got into sensing range, pyroelectric infrared transducer JZ outputed signal to 14 pin of signal processing integrated circuit U4; The 2 pin output high level signal of this signal processing integrated circuit U4, control Driver Circuit makes relay K A adhesive, at this moment the piezoelectric driving circuit energized; The oscillatory circuit of 555 integrated timer U5 composition is accepted also starting oscillation of high level because of 4 pin simultaneously; This oscillator signal exports the grid of the switching tube Q1 of piezoelectric driving circuit to by 3 pin of 555 integrated timer U5, makes its conducting/shutoff periodically, makes piezoelectric driving plate JZ accept alternating voltage and reciprocating; Infrared radiation to input is modulated; Even this moment, human body was in the transfixion state, pyroelectric infrared transducer still has signal output, reaches the purpose of active monitoring.
After human body leaves, because pyroelectric infrared transducer does not receive infrared radiation, then no signal output; Signal processing integrated circuit U4 will arrive the back by 2 pin output low levels at the output delay time of setting; Relay K A dead electricity quits work, and makes controlled load and piezoelectric driving circuit lose power supply and quits work, and 4 pin of 555 integrated timer U5 are accepted low level and the failure of oscillations; By 3 pin output low levels, entire circuit is in holding state.
If working method configuration switch SA1, SA2 close, working method configuration switch SA4 dials to connecing the high level position, and then piezoelectric driving plate JZ is in running order, and entire circuit is in pure active mode.If working method configuration switch SA1 opens, working method configuration switch SA3 dials to earthing position, and then circuit is in pure passive working method.
Claims (6)
1. active pyroelectric infrared sensor; Comprise pyroelectric infrared sensor probe (6), pyroelectric infrared sensor probe (6) upper end is provided with pyroelectric infrared sensor probe window (11), it is characterized in that: pyroelectric infrared sensor probe (6) is installed on the substrate (7); Substrate (7) is provided with aperture (10); Support (4) is installed below the substrate (7), and piezoelectric driving plate (1) passes aperture (10), and piezoelectric driving plate (1) lower end is fixed on the support (4); Piezoelectric driving plate (1) upper end fixed modulation sheet (9); Modulation sheet (9) is arranged on pyroelectric infrared sensor probe window (11) top, and semisphere Fresnel Lenses (8) is set on the substrate, and Fresnel Lenses (8) constitutes an obturator with substrate (7); Pyroelectric infrared sensor probe (6) lower end is provided with pyroelectric infrared sensor probe electrode (5), and piezoelectric driving plate (1) connects Piezoelectric Driving plate electrode (3) through piezoelectric driving plate contact conductor (2);
Described pyroelectric infrared sensor probe (6) connects the signal amplification detection circuit through pyroelectric infrared sensor probe electrode (5); Signal amplification detection circuit output terminal connects driving circuit; The driving circuit output terminal connects piezoelectric driving circuit; Signal amplification detection circuit output terminal also connects oscillatory circuit, and output end of oscillating circuit connects piezoelectric driving circuit, and the piezoelectric driving circuit output terminal connects modulator; Modulator is corresponding with the incident human infrared radiation, and driving circuit connects controlled load;
Described piezoelectric driving plate (1) connects piezoelectric driving circuit through Piezoelectric Driving plate electrode (3).
2. active pyroelectric infrared sensor according to claim 1 is characterized in that: described piezoelectric driving circuit comprises commutation diode D1-D4, capacitor C 1, capacitor C 2; Resistance R 1-R6; Switching tube Q1, piezoelectric driving plate JZ, commutation diode are connected live wire and zero line two ends; Capacitor C 1, capacitor C 2 two ends connect the commutation diode two ends; Connect with resistance R 4, switching tube Q1, resistance R 5, resistance R 6 back branch road and be connected in the two ends of capacitor C 2 of resistance R 1-R3 series connection back branch road, piezoelectric driving plate JZ-end connects the common port of resistance R 1 and resistance R 2, the common port of other end connection switching tube Q1 and resistance R 5.
3. active pyroelectric infrared sensor according to claim 1 is characterized in that: described signal amplification detection circuit adopts BISS0001 or OT0001 signal processing integrated circuit U4, and the S utmost point of pyroelectric infrared sensor probe electrode (5) connects 14 pin of signal processing integrated circuit U4; 2 pin of signal processing integrated circuit U4 connect control Driver Circuit and working method configuration switch SA4, and the D utmost point of pyroelectric infrared sensor probe electrode (5) connects 9 pin of signal processing integrated circuit U4, the G utmost point ground connection of pyroelectric infrared sensor probe electrode (5); Connect capacitor C 8 and resistance R 7 between the S utmost point and the G utmost point, capacitor C 8 and resistance R 7 parallel connections, 16 pin of signal processing integrated circuit U4 are connected 12 pin after series capacitance C9, resistance R 9 and the resistance R 10 successively; 13 pin connect the common port of resistance R 9 and resistance R 10; Capacitor C 10 is connected the two ends of resistance R 10, and 15 pin are connected to 16 pin through resistance R 11, and resistance R 11 two ends connect capacitor C 11; 15 pin series connection R12 and capacitor C 12 back ground connection; 6 pin and 3 pin are resistance in series R14, capacitor C 14 and resistance R 13, capacitor C 13 back ground connection respectively, and 5 pin connect capacitor C 14 back ground connection, 7 pin ground connection; 4 pin connect capacitor C 13 and resistance R 13; 1 pin is connected working method configuration switch SA3 with 8 pin, 11 pin are connected working method configuration switch SA4 with 8 pin one tunnel, and 3 pin of oscillatory circuit 555 integrated timer U5 are inserted on another road through resistance R 15 and D8; 11 pin and 8 pin are through capacitor C 17 ground connection, and 11 pin are connected the integrated stabilivolt U3 of three ends with 8 pin.
4. active pyroelectric infrared sensor according to claim 1 is characterized in that: described oscillatory circuit adopts NE555P, comprises 555 integrated timer U5, resistance R 16 and resistance R 17; Be connected 6 pin after the 5 pin series capacitance C16 of capacitor C 15 and capacitor C 16,555 integrated timer U5 and the capacitor C 15, be connected 6 pin after 8 pin resistance in series R16 and the resistance R 17; 7 pin connect the common port of resistance R 16 and resistance R 17; 2 pin connect the common port of capacitor C 15 and 6 pin, 1 pin ground connection, and 8 pin connect 8 pin and 11 pin of signal processing integrated circuit U4; 4 pin connect working method configuration switch SA4, and 3 pin connect the grid of switching tube Q1.
5. active pyroelectric infrared sensor according to claim 1 is characterized in that: described control Driver Circuit comprises resistance R 18-R21, triode Q2, triode Q3; Light emitting diode D9; Diode D7 and relay K A, 2 pin of signal processing integrated circuit U4 are through the base stage of resistance R 19 connection triode Q2, and the collector of Q2 connects working method configuration switch SA4 through resistance R 18; Triode Q2 emitter connects the base stage of triode Q3; The base stage of triode Q3 is passed through resistance R 20 ground connection, triode Q3 grounded emitter, and collector connects light emitting diode D9 and resistance R 21; Diode D7 and relay K A are connected in parallel on resistance D9 and resistance R 21 two ends respectively, and the common port of resistance R 21, diode D7 and relay K A is connected three end integrated stable voltage circuit U2.
6. active pyroelectric infrared sensor according to claim 5; It is characterized in that: the input end end of described three end integrated stable voltage circuit U2 connects rectifier bridge heap U1; The rectifier bridge heap connects the 220V civil power through transformer T, and the output terminal of three end integrated stable voltage circuit U2 connects three end integrated stable voltage circuit U3.
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| CN201210315422.9A CN102788646B (en) | 2012-08-30 | 2012-08-30 | Active-type pyroelectric infrared sensor |
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| CN201210315422.9A CN102788646B (en) | 2012-08-30 | 2012-08-30 | Active-type pyroelectric infrared sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713652A (en) * | 2015-04-04 | 2015-06-17 | 肖国选 | Pyroelectric infrared sensor |
| CN111835324A (en) * | 2019-04-15 | 2020-10-27 | 蔡作华 | Active scanning pyroelectric infrared induction switch |
| CN111835330A (en) * | 2019-04-15 | 2020-10-27 | 蔡作华 | Existing pyroelectric infrared induction switch |
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| US20090297137A1 (en) * | 2008-04-01 | 2009-12-03 | Entis Allan C | Omni-directional camera system |
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| CN2718902Y (en) * | 2004-08-10 | 2005-08-17 | 惠州雷士工业发展有限公司 | Intelligent human body induction switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104713652A (en) * | 2015-04-04 | 2015-06-17 | 肖国选 | Pyroelectric infrared sensor |
| CN104713652B (en) * | 2015-04-04 | 2018-05-25 | 肖国选 | Pyroelectric infrared sensor |
| CN111835324A (en) * | 2019-04-15 | 2020-10-27 | 蔡作华 | Active scanning pyroelectric infrared induction switch |
| CN111835330A (en) * | 2019-04-15 | 2020-10-27 | 蔡作华 | Existing pyroelectric infrared induction switch |
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| CN102788646B (en) | 2014-07-16 |
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