Summary of the invention
It is an object of the invention to solve existing infrared anti-theft alarm system stability the highest, be susceptible to false alarm existingThe defect of elephant, it is provided that a kind of pulse adjusting type infrared anti-theft alarm system.
The purpose of the present invention is by following technical proposals reality: a kind of pulse adjusting type infrared anti-theft alarm system, mainlyBy alarm BL, photoelectrical coupler U, audion VT3, audion VT4, audion VT5, audion VT7, it is serially connected in audionResistance R6, P pole between emitter stage and second input of photoelectrical coupler U of VT3 is connected with the base stage of audion VT3, NThe diode D3 that pole is connected with second input of photoelectrical coupler U, is serially connected in colelctor electrode and the audion of audion VT4Resistance R7, P pole between the colelctor electrode of VT3 is connected with first outfan of photoelectrical coupler U, N pole connects the diode of power supplyD4, the resistance R9 being serially connected between the N pole of diode D4 and the base stage of audion VT5, be serially connected in audion VT5 colelctor electrode andResistance R10, P pole between the N pole of diode D4 is connected with the emitter stage of audion VT5, the current collection of N pole and audion VT7The diode D5 that pole is connected, positive pole is connected with second outfan of photoelectrical coupler U, the base stage of negative pole and audion VT7The electric capacity C5 being connected, one end is connected with second outfan of photoelectrical coupler U, the other end after resistance R11 with audionThe resistance R8 that the emitter stage of VT7 is connected, positive pole is connected with the N pole of diode D4, the electric capacity C7 of minus earth, with diodeThe bias amplifier that the P pole of D5 is connected, simultaneously with the second input, the base stage of audion VT3 and the collection of photoelectrical coupler UThe triggering circuit that the base stage of electrode and audion VT4 is connected, the phase adjusting circuit being connected with triggering circuit, andThe infrared electro control circuit composition being simultaneously connected with phase adjusting circuit and triggering circuit；Described resistance R8 and resistance R11Junction point be connected with alarm BL；Described alarm BL is connected with bias amplifier.
Described phase adjusting circuit is by audion VT9, audion VT10, audion VT11, and audion VT12, positive pole is through electricityBe connected with the colelctor electrode of audion VT9 after resistance R16, electricity that negative pole base stage with audion VT11 after resistance R19 is connectedHolding C9, negative pole is connected with the emitter stage of audion VT10, positive pole base stage with audion VT9 after resistance R17 is connectedTwo poles that electric capacity C10, N pole is connected with the positive pole of electric capacity C10, P pole base stage with audion VT12 after resistance R21 is connectedThe diode D10 that pipe D9, P pole is connected with the negative pole of electric capacity C9, N pole negative pole with electric capacity C10 after resistance R18 is connected,The emitter stage of the resistance R20 being serially connected between the colelctor electrode of audion VT11 and the positive pole of electric capacity C9, positive pole and audion VT11Be connected, electric capacity C11, N pole that negative pole is connected with the negative pole of electric capacity C10 is connected with the base stage of audion VT12, P pole and electricityDiode D11, the P pole that is connected of negative pole holding C11 is connected with the colelctor electrode of audion VT12, N pole and the positive pole of electric capacity C9The diode D12 being connected, positive pole is connected with the N pole of diode D12, negative pole after resistance R22 with audion VT12 send outThe electric capacity C12 composition that emitter-base bandgap grading is connected；The colelctor electrode of described audion VT10 is connected with the emitter stage of audion VT9, base stageAs the input of this phase adjusting circuit and it is connected with infrared electro control circuit；The negative pole of described electric capacity C12 is as thisThe outfan of infrared electro control circuit is also connected with triggering circuit.
Described triggering electricity routing amplifier P1, audion VT2, negative pole is connected with the positive pole of amplifier P1, positive pole is with electricHold electric capacity C2, the P pole that is connected of negative pole of the C12 negative pole with amplifier P1 after resistance R2 be connected, N pole and audion VT2The diode D2 that is connected of colelctor electrode, positive pole is connected with the colelctor electrode of audion VT2, the base stage of negative pole and audion VT3The electric capacity C4 being connected, the resistance R3 being serially connected between the base stage of audion VT10 and the outfan of amplifier P1, forward end withThe not gate A2 that the outfan of amplifier P1 is connected, backward end is connected with the base stage of audion VT4, positive pole is with amplifier P1'sThe electric capacity C3 that outfan is connected, negative pole is connected with the base stage of audion VT2, one end is connected with the base stage of audion VT2,The resistance R4 that other end emitter stage with audion VT2 after resistance R5 is connected, and forward end controls electricity with infrared electroThe not gate A1 composition that road is connected, backward end base stage with audion VT2 after diode D1 is connected；Described resistance R4 and electricityResistance R5 junction point be connected with second input of photoelectrical coupler U while ground connection；The colelctor electrode of described audion VT3 withThe base stage of audion VT10 is connected.
Described infrared electro control circuit by optical transistor VT1, and positive pole after infrarede emitting diode VL with photosensitiveThe electric capacity C1 group that the colelctor electrode of transistor VT1 is connected, negative pole emitter stage with optical transistor VT1 after resistance R1 is connectedBecome；The colelctor electrode of described optical transistor VT1 is connected with the base stage of audion TV10, the forward end of its emitter stage NAND gate A1It is connected；The positive pole of described electric capacity C1 and the colelctor electrode of optical transistor VT1 are collectively forming power input.
Described bias amplifier is by audion VT6, power amplification circuit, and P pole is connected with the base stage of audion VT6, NThe diode D6 that pole is connected with the colelctor electrode of audion VT6, and positive pole after resistance R14 with the colelctor electrode of audion VT6Be connected, electric capacity C8 composition that negative pole junction point with resistance R8 and resistance R11 after alarm BL is connected；Described audionThe emitter stage of VT6 is all connected with power amplification circuit with the negative pole of electric capacity C8；With resistance R8 while of described power amplification circuitIt is connected with the junction point of resistance R11 and the P pole of diode D5.
Described power amplification circuit by audion VT8, amplifier P2, is serially connected in the positive pole of amplifier P2 and diode D5Resistance R12, N pole between P pole is connected with the colelctor electrode of audion VT8, P pole is connected with the base stage of audion VT8 twoPole pipe D7, positive pole is connected with the emitter stage of audion VT8, negative pole is same with what the junction point of resistance R8 and resistance R11 was connectedTime ground connection two poles that electric capacity C6, P pole is connected with the outfan of amplifier P2, N pole is connected with the colelctor electrode of audion VT8Pipe D8, the resistance R13 being in parallel with diode D8, and it is serially connected in the electricity between the N pole of diode D8 and the negative pole of electric capacity C8Resistance R15 composition；The positive pole of described amplifier P2 is connected with the emitter stage of audion VT6, the current collection of its negative pole and audion VT8Pole is connected.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) present invention has stronger anti-common mode disturbances ability, it is possible to well suppress interference, and not by system selfThe impact of electromagnetic interference, compared with traditional IR alarm system, its stability is higher, relative to traditional IR alarm systemThe situation of false alarm easily occurs, the present invention can existing in the case of warning accuracy rate only has 80% by this warning accuracy rateBring up to more than 95%.
(2) present invention can improve the power of output signal such that it is able to preferably drives alarm BL work.
(3) electric voltage frequency can be adjusted by the present invention, makes electric voltage frequency more stable, it is to avoid voltage occur fluctuation andAffect the stability of the present invention.
Embodiment
As it is shown in figure 1, the present invention is mainly by alarm BL, photoelectrical coupler U, audion VT3, audion VT4, audionVT5, audion VT7, the resistance R6, P being serially connected between the emitter stage of audion VT3 and second input of photoelectrical coupler UThe diode D3 that pole is connected with the base stage of audion VT3, N pole is connected with second input of photoelectrical coupler U, is serially connected inResistance R7, P pole between colelctor electrode and the colelctor electrode of audion VT3 of audion VT4 and first outfan of photoelectrical coupler UBe connected, N pole meets diode D4, the resistance R9 being serially connected between the N pole of diode D4 and the base stage of audion VT5 of power supply,The emitter stage phase of resistance R10, the P pole being serially connected between the colelctor electrode of audion VT5 and the N pole of diode D4 and audion VT5The diode D5 that connection, N pole are connected with the colelctor electrode of audion VT7, positive pole is connected with second outfan of photoelectrical coupler UConnect, electric capacity C5 that negative pole is connected with the base stage of audion VT7, one end is connected, separately with second outfan of photoelectrical coupler UThe resistance R8 that one end emitter stage with audion VT7 after resistance R11 is connected, positive pole is connected with the N pole of diode D4, negativeThe electric capacity C7 of pole ground connection, the bias amplifier being connected with the P pole of diode D5, the most defeated with the second of photoelectrical coupler UEnter end, the triggering circuit that is connected with the base stage of colelctor electrode and audion VT4 of the base stage of audion VT3, and trigger circuit phaseThe phase adjusting circuit connected, and the infrared electro control circuit group being simultaneously connected with phase adjusting circuit and triggering circuitBecome.The junction point of described resistance R8 and resistance R11 is connected with alarm BL.Described alarm BL is connected with bias amplifierConnect.
Wherein, photoelectrical coupler U, audion VT3, audion VT4, diode D4, resistance R9, electric capacity C5, diode D3,Resistance R6, audion VT5 and audion VT7 form a photoelectric coupling switch circuit, and this photoelectric coupling switch circuit canWell suppress interference, and do not disturbed by system self electromagnetism and affected, so that the stability of the present invention is higher, Ke Yi greatWidth improves warning accuracy rate.
This triggering electricity routing amplifier P1, audion VT2, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C2, electricityHold C3, electric capacity C4, diode D1, diode D2, not gate A1 and not gate A2 composition.
During connection, the negative pole of electric capacity C2 is connected with the positive pole of amplifier P1, its positive pole and the output of phase adjusting circuitEnd is connected.The P pole of diode D2 negative pole with amplifier P1 after resistance R2 is connected, the colelctor electrode of N pole and audion VT2It is connected.The positive pole of electric capacity C4 is connected with the colelctor electrode of audion VT2, and negative pole is connected with the base stage of audion VT3.ResistanceR3 is serially connected between the base stage of audion VT10 and the outfan of amplifier P1.The forward end of not gate A2 and the output of amplifier P1End is connected, and backward end is connected with the base stage of audion VT4.The positive pole of electric capacity C3 is connected with the outfan of amplifier P1,Negative pole is connected with the base stage of audion VT2.One end of resistance R4 is connected with the base stage of audion VT2, and the other end is through resistanceAfter R5, the emitter stage with audion VT2 is connected.The forward end of not gate A1 is connected with infrared electro control circuit, backward end warpAfter diode D1, the base stage with audion VT2 is connected.The of the junction point of described resistance R4 and resistance R5 and photoelectrical coupler UTwo inputs be connected while ground connection.The colelctor electrode of described audion VT3 is connected with phase adjusting circuit.This triggering circuitCan according to the signal that infrared electro control circuit sends make photoelectric coupling switch circuit turn-on or by.
Described infrared electro control circuit by optical transistor VT1, and positive pole after infrarede emitting diode VL with photosensitiveThe electric capacity C1 group that the colelctor electrode of transistor VT1 is connected, negative pole emitter stage with optical transistor VT1 after resistance R1 is connectedBecome.The described colelctor electrode of optical transistor VT1 is connected with the input of phase adjusting circuit, its emitter stage NAND gate A1 justIt is connected to end；The positive pole of described electric capacity C1 and the colelctor electrode of optical transistor VT1 are collectively forming power input.Infrared electroControl circuit is for detecting whether there is people to pass through.
It addition, this bias amplifier can improve the power of output signal, thus preferably drive alarm VL, its byAudion VT6, power amplification circuit, P pole is connected with the base stage of audion VT6, N pole is connected with the colelctor electrode of audion VT6The diode D6 connect, and positive pole colelctor electrode with audion VT6 after resistance R14 is connected, negative pole after alarm BL withThe electric capacity C8 composition that the junction point of resistance R8 and resistance R11 is connected.The emitter stage of described audion VT6 and the negative pole of electric capacity C8All it is connected with power amplification circuit.Described power amplification circuit simultaneously with resistance R8 and the junction point of resistance R11 and two polesThe P pole of pipe D5 is connected.
Described power amplification circuit is then by audion VT8, amplifier P2, resistance R12, resistance R13, resistance R15, diodeD7, diode D8 and electric capacity C6 form.
Wherein resistance R12 is serially connected between the positive pole of amplifier P2 and the P pole of diode D5.The N pole and three of diode D7The colelctor electrode of pole pipe VT8 is connected, and P pole is connected with the base stage of audion VT8.The positive pole of electric capacity C6 is sent out with audion VT8'sEmitter-base bandgap grading is connected, negative pole be connected with the junction point of resistance R8 and resistance R11 while ground connection.The P pole of diode D8 and amplificationThe outfan of device P2 is connected, and N pole is connected with the colelctor electrode of audion VT8.Resistance R13 is in parallel with diode D8.ResistanceR15 is serially connected between the N pole of diode D8 and the negative pole of electric capacity C8.The positive pole of described amplifier P2 and the transmitting of audion VT6Pole is connected, and its negative pole is connected with the colelctor electrode of audion VT8.
As in figure 2 it is shown, this phase adjusting circuit is by audion VT9, audion VT10, audion VT11, audion VT12,Resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, electric capacity C9, electric capacity C10, electric capacityC11, electric capacity C12, diode D9, diode D10, diode D11 and diode D12 form.
During connection, the positive pole of electric capacity C9 colelctor electrode with audion VT9 after resistance R16 is connected, and negative pole is through resistance R19Base stage with audion VT11 is connected afterwards.The negative pole of electric capacity C10 is connected with the emitter stage of audion VT10, and positive pole is through resistanceAfter R17, the base stage with audion VT9 is connected.The N pole of diode D9 is connected with the positive pole of electric capacity C10, and P pole is through resistance R21Base stage with audion VT12 is connected afterwards.The P pole of diode D10 is connected with the negative pole of electric capacity C9, and N pole is after resistance R18It is connected with the negative pole of electric capacity C10.Resistance R20 is serially connected between the colelctor electrode of audion VT11 and the positive pole of electric capacity C9.Electric capacityThe positive pole of C11 is connected with the emitter stage of audion VT11, and negative pole is connected with the negative pole of electric capacity C10.The N pole of diode D11Being connected with the base stage of audion VT12, P pole is connected with the negative pole of electric capacity C11.The P pole of diode D12 and audion VT12Colelctor electrode be connected, N pole is connected with the positive pole of electric capacity C9.
The positive pole of electric capacity C12 is connected with the N pole of diode D12, negative pole after resistance R22 with the transmitting of audion VT12Pole is connected.The colelctor electrode of described audion VT10 is connected with the emitter stage of audion VT9, and base stage adjusts electricity as this pulseThe input on road is also connected with the colelctor electrode of optical transistor VT1.The negative pole of described electric capacity C12 controls as this infrared electroThe outfan of circuit is also connected with the positive pole of electric capacity C2.The base stage of described audion VT10 and the colelctor electrode phase of audion VT3Connect.The voltage of optical transistor VT1 output can be processed by this phase adjusting circuit, and the frequency making voltage is more steadyFixed, it is to avoid voltage occurs that fluctuation affects the stability of the present invention.
When no one passes through, the infrared light that infrarede emitting diode VL launches is received by optical transistor VT1, photosensitive crystalPipe VT1 exports high level, the forward of not gate A2 extremely high level, reversed pole output low level, at this moment audion VT4 cut-off, lightElectric coupler U is not turned on, and alarm BL does not send sound.When there being people to pass through, the infrared light that infrarede emitting diode VL launchesBeing interdicted by moment, optical transistor VT1 output low level, not gate A1 and not gate A2 all exports high level, and at this moment audion VT4 leadsLogical, so that photoelectrical coupler U is also switched on, audion VT5 and audion VT7 also must conduct, and signal then inputs to two-stage and putsBig processing of circuit rear drive alarm BL reports to the police.
As it has been described above, just can well realize the present invention.