CN105606835A - Novel traceable alcometer based on low-pass filter circuit - Google Patents
Novel traceable alcometer based on low-pass filter circuit Download PDFInfo
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Abstract
The invention discloses a novel traceable alcometer based on a low-pass filter circuit. The novel traceable alcometer mainly comprises a central processing unit, as well as a displayer, a GPS (global positioning system) positioning module, a storage, a wireless sensing circuit, an alarm, a switching circuit and the like, which are connected with the central processing unit respectively. The novel traceable alcometer is arranged in an automobile cab and used for detecting the alcohol content of a driver; if the driver drives drunkly, the alcometer geographically positions a drunkly driven automobile in real time by the GPS positioning module and sends the geographic position of the drunkly driven automobile to a traffic command and monitoring center by a wireless transmission circuit, so that traffic control personnel conveniently trace and process the drunkly driven automobile, and the traffic offence of drunk driving is fundamentally eradicated. The novel traceable alcometer is provided with the low-pass filter circuit, thereby being capable of performing filtering processing on voltage signals and preventing interference signals from affecting the detection precision of the alcometer.
Description
Technical field
The present invention relates to a kind of detector, specifically refer to a kind of novel traceable wine based on low-pass filter circuitEssence detector.
Background technology
In recent years, China's automobile pollution is in continuous increase, meanwhile, and by the caused people that drives when intoxicatedThe traffic accident incidence of member's injures and deaths and property loss is also constantly soaring. In order to stop the generation of this existing picture,Domestic some conventional methods of common use detect drunk driving behavior, with the test of hand-held expiration alcohol andThe inspection of headspace gas chromatography instrument blood alcohol. But two kinds of above-mentioned methods can only be established card by traffic monitoring personnelImplement, detect and bring very large inconvenience to drunk driving, can not fundamentally stop the act of violating regulations of driving when intoxicated.
Summary of the invention
The object of the invention is to overcome traditional drunk driving detection method and detect and bring very large inconvenience to drunk driving,Can not fundamentally stop the act of violating regulations defect of driving when intoxicated, provide a kind of based on low-pass filter circuitNovel traceable alcohol content tester.
Object of the present invention is achieved through the following technical solutions: a kind ofly chase after based on the novel of low-pass filter circuitTrack alcohol content tester, mainly by central processing unit, the display, the GPS that are connected with central processing unit respectivelyLocating module, holder, wireless sensing circuit, alarm and change-over circuit, and be connected with change-over circuitThe alcohol sensor composition connecing; In order better to implement the present invention, the present invention processes at change-over circuit and central authoritiesBetween device, be also serially connected with low-pass filter circuit, described wireless transmission circuit is by amplifier P1, triode VT6,Triode VT7, triode VT8, negative pole is connected with the base stage of triode VT6, positive pole forms this nothingThe capacitor C 8 of the signal input part of line transmission circuit, negative pole is connected with 12V voltage, positive pole with triodeThe capacitor C 9 that the emitter stage of VT6 is connected, be serially connected in the negative pole of capacitor C 9 and the base stage of triode VT6 itBetween resistance R 8, be serially connected in the resistance R 12 between the emitter stage of triode VT8 and the negative pole of capacitor C 9,Be serially connected in the resistance R 9 between the colelctor electrode of triode VT6 and the base stage of triode VT7, anodal and three utmost pointsThe capacitor C that base stage is connected, negative pole is connected with the negative pole of capacitor C 9 after inductance L 2 10 of pipe VT7,Be serially connected in the resistance R 11 between positive pole and the output of amplifier P1, be serially connected in amplifier P1 negative pole andResistance R 10 between the base stage of triode VT7, the N utmost point is connected with the colelctor electrode of triode VT8, the P utmost pointThe diode D8 of ground connection, and positive pole is connected with the colelctor electrode of triode VT8, negative pole is connected with antennaThe capacitor C 11 connecing forms; The positive pole of described amplifier P1 is connected with the emitter stage of triode VT6, itOutput is connected with the base stage of triode VT8; The emitter stage of described triode VT7 and triode VT8Colelctor electrode be connected, its colelctor electrode is connected with the P utmost point of diode D8; Described wireless transmission circuitSignal input part is connected with central processing unit.
Further, described low-pass filter circuit is by amplifier P2, amplifier P3, one end and amplifier P2The resistance R 13 of the input that positive pole is connected, negative pole forms this low-pass filter circuit, be serially connected in amplifierResistance R 14 between positive pole and the output of P2, anodal be connected with the positive pole of amplifier P2, negative pole withThe capacitor C 12 that the output of amplifier P2 is connected, negative pole is connected with the output of amplifier P2, justThe capacitor C 13 of utmost point ground connection, with the resistance R 15 that capacitor C 13 is in parallel, is serially connected in the output of amplifier P2And resistance R 16 between the positive pole of amplifier P3, be anodally connected with the output of amplifier P2, negative poleThe capacitor C 14 being connected with the output of amplifier P3 after resistance R 17, negative pole and amplifier P3'sOutput is connected, the capacitor C of plus earth 15, the resistance R 18 being in parallel with capacitor C 15, and PThe diode D9 group that the utmost point is connected with the negative pole of amplifier P3, the N utmost point is connected with the positive pole of capacitor C 15Become; The minus earth of described amplifier P2; The output of described amplifier P3 forms this LPF electricityThe output on road; The input of described low-pass filter circuit is connected with the output of change-over circuit, its outputEnd is connected with central processing unit.
Described change-over circuit is by non-linear compensation circuit, the analog-to-digital conversion electricity being connected with non-linear compensation circuitRoad, and the mu balanced circuit being connected with analog to digital conversion circuit composition; The input of described non-linear compensation circuitEnd is connected with alcohol sensor, and the output of mu balanced circuit is connected with the input of low-pass filter circuit.
Described non-linear compensation circuit is by triode VT1, triode VT2, and triode VT3, the N utmost point is through electricityResistance is connected with the base stage of triode VT1 after R1, the P utmost point after capacitor C 1 with the base stage of triode VT2The diode D1 being connected, negative pole is connected with the colelctor electrode of triode VT3, positive pole is after resistance R 2The capacitor C 2 being connected with the emitter stage of triode VT1, anodal after resistance R 3 with the sending out of triode VT3The capacitor C 3 that emitter-base bandgap grading is connected, negative pole is connected with the colelctor electrode of triode VT2, the P utmost point and triodeThe diode D2 that the colelctor electrode of VT1 is connected, the N utmost point is connected with analog to digital conversion circuit, and the P utmost point withThe diode D3 that the N utmost point is connected, the N utmost point is connected with the analog to digital conversion circuit composition of diode D2; InstituteThe base stage of stating triode VT3 is connected with the base stage of triode VT2, its colelctor electrode with analog to digital conversion circuitBe connected, its emitter stage is connected with the emitter stage of triode VT2; The colelctor electrode of described triode VT2Be connected with analog to digital conversion circuit; The N utmost point of described diode D1 forms the defeated of this non-linear compensation circuitEnter end.
Analog-digital conversion circuit as described is by conversion chip U, FET MOS, the collection of anodal and triode VT3The capacitor C 4 that electrode is connected, negative pole is connected with the drain electrode of FET MOS, negative pole is through inductance L 1Be connected with the source electrode of FET MOS afterwards, the capacitor C 5 of plus earth, and the N utmost point and conversion chipThe diode D4 composition that the DIN pin of U is connected, the P utmost point is connected with the positive pole of capacitor C 4; DescribedThe VDD pin of conversion chip U is connected with the positive pole of capacitor C 4, its CS pin with diode D3The N utmost point be connected, its GND pin is simultaneously and the source electrode of FET MOS and the collection of triode VT2Electrode is connected, and its OUTA pin is all connected with mu balanced circuit with REF pin; Described capacitor C 5Negative pole is also connected with the N utmost point of diode D2.
Described mu balanced circuit is by triode VT4, triode VT5, unidirectional thyristor D5, the P utmost point and triodeVoltage stabilizing two utmost points of the output that the emitter stage of VT5 is connected, the N utmost point forms this mu balanced circuit after resistance R 7Pipe D7, positive pole is connected with the N utmost point of Zener diode D7, bears through potentiometer R4 in turn after resistance R 5The capacitor C 7 that the utmost point is connected with the base stage of triode VT5 after Zener diode D6, is serially connected in triodeResistance R 6 between the OUTA pin of the base stage of VT5 and conversion chip U, and anodal and triode VT4Base stage be connected, negative pole forms with the capacitor C 6 that the OUTA pin of conversion chip U is connected; InstituteThe control end of stating unidirectional thyristor D5 is connected with the control end of potentiometer R4, its N utmost point with capacitor C 7Positive pole be connected, its P utmost point is connected with the emitter stage of triode VT4; The base of described triode VT4The utmost point is connected with the REF pin of conversion chip U, its grounded collector; The colelctor electrode of described triode VT5Ground connection.
Described conversion chip U is MAX522 integrated chip.
The present invention compares compared with prior art, has the following advantages and beneficial effect:
(1) to be arranged on car steering indoor in the present invention, detects the alcohol content of human pilot, as drive artificialThe geographical position of drunk driving vehicle is located in drunk driving in real time by GPS locating module, and passes through wireless transmission circuitThe geographical position of driving of filling a wine cup for sends to point duty Surveillance center, so that traffic monitoring personnel are to drunk drivingVehicle is followed the trail of, is processed, and fundamentally stops the act of violating regulations of driving when intoxicated.
(2) wireless transmission circuit of the present invention can be put the geographic location signal of drunk driving vehicleGreatly, the decay being occurred because of long Distance Transmission with compensating signal, thereby the transmission range that has extended signal.
(3) the present invention is provided with low-pass filter circuit, and it can carry out filtering processing to voltage signal, avoidsInterfering signal affects accuracy of detection of the present invention.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of change-over circuit of the present invention.
Fig. 3 is the structural representation of wireless transmission circuit of the present invention.
Fig. 4 is the structural representation of low-pass filter circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are notBe limited to this.
Embodiment
As shown in Figure 1, a kind of novel traceable alcohol content tester based on low-pass filter circuit of the present invention,Mainly by central processing unit, the display, GPS locating module, the storage that are connected with central processing unit respectivelyDevice, wireless sensing circuit, alarm and low-pass filter circuit, the conversion electricity being connected with low-pass filter circuitRoad, and the alcohol sensor being connected with change-over circuit composition.
The MQ303B type alcohol sensing that this alcohol sensor adopts dredging collateral Science and Technology Ltd. of Shenzhen to produceDevice, it is for detection of the alcohol content of human pilot, and transmission and the corresponding strength signal of alcohol concentration are to turningChange circuit. This change-over circuit is processed for the signal that alcohol sensor is sent, and its structure is as Fig. 2 instituteShow by by non-linear compensation circuit the analog to digital conversion circuit being connected with non-linear compensation circuit, and and mouldThe mu balanced circuit composition that number conversion circuit is connected.
Described non-linear compensation circuit is by triode VT1, triode VT2, and triode VT3, resistance R 1,Resistance R 2, resistance R 3, diode D1, diode D2, diode D3, capacitor C 1, capacitor C 2 withAnd capacitor C 3 forms.
When connection, the N utmost point of diode D1 is connected with the base stage of triode VT1 after resistance R 1, its PThe utmost point is connected with the positive pole of capacitor C 1. The negative pole of described capacitor C 1 is connected with the base stage of triode VT2Connect. The negative pole of capacitor C 2 is connected with the colelctor electrode of triode VT3, its positive pole after resistance R 2 with threeThe emitter stage of utmost point pipe VT1 is connected. The positive pole of capacitor C 3 after resistance R 3 with the transmitting of triode VT3The utmost point is connected, its negative pole is connected with the colelctor electrode of triode VT2. The P utmost point of diode D2 and three utmost pointsThe colelctor electrode of pipe VT1 is connected, its N utmost point is connected with analog to digital conversion circuit. The P utmost point of diode D3Be connected with the N utmost point of diode D2, its N utmost point is connected with analog to digital conversion circuit. Described triode VT3Base stage be connected with the base stage of triode VT2, its colelctor electrode is connected with analog to digital conversion circuit, itsEmitter-base bandgap grading is connected with the emitter stage of triode VT2. The colelctor electrode of described triode VT2 and analog-to-digital conversion electricityRoad is connected. The N utmost point of described diode D1 forms input and the alcohol of this non-linear compensation circuitSensor is connected. The signal of input can transmit by Inhibitory signal after this non-linear compensation circuit is processedDecay in journey, thus make the fidelity of signal higher.
This analog to digital conversion circuit is by conversion chip U, FET MOS, capacitor C 4, capacitor C 5, inductanceL1 and diode D4 composition. Wherein, the positive pole of capacitor C 4 be connected with the colelctor electrode of triode VT3,Its negative pole is connected with the drain electrode of FET MOS. The negative pole of capacitor C 5 is imitated with field after inductance L 1The source electrode that should manage MOS is connected, its plus earth. The N utmost point of diode D4 and the DIN of conversion chip UPin is connected, its P utmost point is connected with the positive pole of capacitor C 4.
Meanwhile, the VDD pin of described conversion chip U is connected with the positive pole of capacitor C 4, its CS pinBe connected with the N utmost point of diode D3, its GND pin simultaneously with the source electrode of FET MOS andThe colelctor electrode of triode VT2 is connected, and its OUTA pin is all connected with mu balanced circuit with REF pin.The negative pole of described capacitor C 5 is also connected with the N utmost point of diode D2.
The signal of this non-linear compensation circuit output is converted to voltage signal so that centre through analog to digital conversion circuitThe identification of reason device and processing. In order to improve conversion efficiency, described conversion chip U preferably adopts MAX522 integratedChip is realized.
Described mu balanced circuit is by triode VT4, triode VT5, and unidirectional thyristor D5, potentiometer R4,Resistance R 5, resistance R 6, resistance R 7, Zener diode D6, Zener diode D7, capacitor C 6 and electricityHold C7 composition.
When connection, the P utmost point of Zener diode D7 is connected with the emitter stage of triode VT5, its N utmost pointAfter resistance R 7, form the output of this mu balanced circuit and be connected with the input of low-pass filter circuit. Electric capacityThe positive pole of C7 in turn through potentiometer R4 be connected with the N utmost point of Zener diode D7 after resistance R 5, it is negativeThe utmost point is connected with the N utmost point of Zener diode D6. The P utmost point of described Zener diode D6 with triodeThe base stage of VT5 is connected. Resistance R 6 is serially connected in the base stage of triode VT5 and the OUTA of conversion chip UBetween pin. The positive pole of capacitor C 6 is connected with the base stage of triode VT4, its negative pole with conversion chip UOUTA pin be connected.
The control end of described unidirectional thyristor D5 is connected with the control end of potentiometer R4, its N utmost point with electricityThe positive pole that holds C7 is connected, and its P utmost point is connected with the emitter stage of triode VT4. Described triode VT4Base stage be connected with the REF pin of conversion chip U, its grounded collector. The collection of described triode VT5Electrode grounding. Voltage signal through analog to digital conversion circuit output carries out voltage stabilizing processing by mu balanced circuit, thereby keeps awayExempt from voltage pulsation and affect accuracy of detection of the present invention.
This low-pass filter circuit, for voltage signal is carried out to filtering processing, avoids interference effect of signals the present inventionAccuracy of detection, as shown in Figure 4, it is by amplifier P2, amplifier P3, resistance R 13, resistance R 14,Resistance R 15, resistance R 16, resistance R 17, resistance R 18, capacitor C 12, capacitor C 13, capacitor C 14,Capacitor C 15 and diode D9 composition.
When connection, one end of resistance R 13 is connected with the positive pole of amplifier P2, its negative pole forms this low passThe input of filter circuit is also connected with the output of change-over circuit. Resistance R 14 is serially connected in amplifier P2'sBetween positive pole and output. The positive pole of capacitor C 12 is connected with the positive pole of amplifier P2, its negative pole with putThe output of large device P2 is connected. The negative pole of capacitor C 13 is connected with the output of amplifier P2, its justUtmost point ground connection. Resistance R 15 is in parallel with capacitor C 13. Resistance R 16 be serially connected in amplifier P2 output andBetween the positive pole of amplifier P3. The positive pole of capacitor C 14 is connected with the output of amplifier P2, its negative poleAfter resistance R 17, be connected with the output of amplifier P3. The negative pole of capacitor C 15 and amplifier P3'sOutput is connected, its plus earth. Resistance R 18 is in parallel with capacitor C 15. The P utmost point of diode D9Be connected with the negative pole of amplifier P3, its N utmost point is connected with the positive pole of capacitor C 15.
Meanwhile, the minus earth of described amplifier P2; The output of described amplifier P3 forms this low passThe output of filter circuit is also connected with central processing unit. Low by this from the voltage signal of change-over circuit outputPass filter circuit filters the interfering signal in voltage signal, avoids interference effect of signals inspection of the present inventionSurvey precision.
In addition, central processing unit is control centre of the present invention, and it preferentially adopts TA89C2051 type monolithicMachine is realized. The XTAL1 pin of this TA89C2051 type single-chip microcomputer connects the output of low-pass filter circuit,Its P3.2 pin device taking alarm, its P3.3 pin connects wireless transmission circuit, and P3.4 pin connects holder, itsP3.5 pin connects GPS locating module. This GPS locating module is used for locating the geographical position of drunk driving vehicle,Its preferential C3-370C type GPS locating module that adopts JCOM company of Korea S to produce, this C3-370C typeThe EN pin of GPS locating module is connected with the P3.5 pin of TA89C2051 type single-chip microcomputer.
This central processing unit is also connected with automobile power source, and in the time that automotive test starts, this central processing unit is notWork, can provide working power to central processing unit when automobile starting, and central processing unit is started working, thisPart is not here done too much and is repeated for prior art.
Display is for showing the alcohol concentration value of human pilot, and holder is for storing the wine of human pilotEssence concentration value, alarm can sound the alarm in the time of human pilot drunk driving, wireless transmission circuit forThe geographical position of driving of filling a wine cup for sends to point duty Surveillance center, and the structure of this wireless transmission circuit is as Fig. 3Shown in, it is by by amplifier P1, triode VT6, and triode VT7, triode VT8, resistance R 8,Resistance R 9, resistance R 10, resistance R 11, resistance R 12, inductance L 2, capacitor C 8, capacitor C 9, electric capacityC10, capacitor C 11 and diode D8 composition.
When connection, the negative pole of capacitor C 8 is connected with the base stage of triode VT6, its positive pole forms this nothingThe signal input part of line transmission circuit is also connected with the P3.3 pin of TA89C2051 type single-chip microcomputer. Electric capacityThe negative pole of C9 is connected with 12V voltage, its positive pole is connected with the emitter stage of triode VT6. ResistanceR8 is serially connected between the negative pole of capacitor C 9 and the base stage of triode VT6. Resistance R 12 is serially connected in triodeBetween the negative pole of the emitter stage of VT8 and capacitor C 9. Resistance R 9 is serially connected in the colelctor electrode and three of triode VT6Between the base stage of utmost point pipe VT7. The positive pole of capacitor C 10 is connected with the base stage of triode VT7, its negative poleAfter inductance L 2, be connected with the negative pole of capacitor C 9. Resistance R 11 is serially connected in the positive pole of amplifier P1 and defeatedGo out between end. Resistance R 10 is serially connected between the negative pole of amplifier P1 and the base stage of triode VT7. Two utmost pointsThe N utmost point of pipe D8 is connected with the colelctor electrode of triode VT8, its P utmost point ground connection. The positive pole of capacitor C 11 withThe colelctor electrode of triode VT8 is connected, its negative pole is connected with antenna.
Meanwhile, the positive pole of described amplifier P1 be connected with the emitter stage of triode VT6, its output withThe base stage of triode VT8 is connected. The colelctor electrode of the emitter stage of described triode VT7 and triode VT8Be connected, its colelctor electrode is connected with the P utmost point of diode D8.
Wherein, triode VT6, resistance R 9, resistance R 10, amplifier P1 and resistance R 11 form oneIndividual amplifying circuit, is made up of triode VT8 and capacitor C 11 after this amplifying circuit amplifies signalRadiating circuit sends to point duty Surveillance center
When work, when human pilot enters automobile cab and starts after automobile, alcohol sensor detects testedIn the gas that personnel breathe out, whether contain alcohol, if contain alcohol, this alcohol sensor sends and wineThe corresponding strength signal of essence concentration is to change-over circuit, and this signal sends corresponding voltage after change-over circuit is processedSignal is to low-pass filter circuit, and this low-pass filter circuit is sent out after the interfering signal in voltage signal is filteredSend central processing unit. Central processing unit is converted to voltage signal alcohol concentration signal and sends to respectively demonstrationDevice and holder, this display demonstrates alcohol concentration value, and holder stores alcohol concentration value.Meanwhile, central processing unit also sends command signal to alarm and GPS locating module, and this alarm sendsAlarm song, and this GPS locating module starts the real-time geographic position of positioned vehicle, and vehicle in real timeReason position feedback is to central processing unit, and central processing unit sends to wireless biography the real-time geographic position of vehicleTransmission of electricity road, sends to point duty Surveillance center by wireless transmission circuit the real-time geographic position of vehicle, withJust point duty personnel follow the trail of vehicle.
As mentioned above, just can well realize the present invention.
Claims (7)
1. the novel traceable alcohol content tester based on low-pass filter circuit, mainly by central processing unit,The display that is connected with central processing unit respectively, GPS locating module, holder, wireless sensing circuit,Alarm and change-over circuit, and the alcohol sensor being connected with change-over circuit composition; It is characterized in that,Between change-over circuit and central processing unit, be also serially connected with low-pass filter circuit; Described wireless transmission circuit is by puttingLarge device P1, triode VT6, triode VT7, triode VT8, the base stage phase of negative pole and triode VT6The capacitor C 8 connect, positive pole forming the signal input part of this wireless transmission circuit, negative pole and 12V voltage phaseConnect, the anodal capacitor C 9 being connected with the emitter stage of triode VT6, be serially connected in the negative pole of capacitor C 9And resistance R 8 between the base stage of triode VT6, be serially connected in the emitter stage of triode VT8 and capacitor C 9Resistance R 12 between negative pole, is serially connected between the colelctor electrode of triode VT6 and the base stage of triode VT7Resistance R 9, anodal be connected with the base stage of triode VT7, negative pole after inductance L 2 with capacitor C 9The capacitor C 10 that negative pole is connected, is serially connected in the resistance R 11 between positive pole and the output of amplifier P1, stringBe connected on the resistance R 10 between the negative pole of amplifier P1 and the base stage of triode VT7, the N utmost point and triode VT8Colelctor electrode be connected, the diode D8 of P utmost point ground connection, and be anodally connected with the colelctor electrode of triode VT8The capacitor C 11 connect, negative pole being connected with antenna forms; The positive pole of described amplifier P1 and triode VT6Emitter stage be connected, its output is connected with the base stage of triode VT8; Described triode VT7'sEmitter stage is connected with the colelctor electrode of triode VT8, and its colelctor electrode is connected with the P utmost point of diode D8;The signal input part of described wireless transmission circuit is connected with central processing unit.
2. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 1,It is characterized in that: described low-pass filter circuit is by amplifier P2 amplifier P3, one end and amplifier P2'sThe resistance R 13 of the input that positive pole is connected, negative pole forms this low-pass filter circuit, is serially connected in amplifierResistance R 14 between positive pole and the output of P2, anodal be connected with the positive pole of amplifier P2, negative pole withThe capacitor C 12 that the output of amplifier P2 is connected, negative pole is connected with the output of amplifier P2, justThe capacitor C 13 of utmost point ground connection, with the resistance R 15 that capacitor C 13 is in parallel, is serially connected in the output of amplifier P2And resistance R 16 between the positive pole of amplifier P3, be anodally connected with the output of amplifier P2, negative poleThe capacitor C 14 being connected with the output of amplifier P3 after resistance R 17, negative pole and amplifier P3'sOutput is connected, the capacitor C of plus earth 15, the resistance R 18 being in parallel with capacitor C 15, and PThe diode D9 group that the utmost point is connected with the negative pole of amplifier P3, the N utmost point is connected with the positive pole of capacitor C 15Become; The minus earth of described amplifier P2; The output of described amplifier P3 forms this LPF electricityThe output on road; The input of described low-pass filter circuit is connected with the output of change-over circuit, its outputEnd is connected with central processing unit.
3. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 2,It is characterized in that: described change-over circuit is by non-linear compensation circuit the mould being connected with non-linear compensation circuitNumber conversion circuit, and the mu balanced circuit being connected with analog to digital conversion circuit composition; Described nonlinear compensation electricityThe input on road is connected with alcohol sensor, the output of mu balanced circuit with the input of low-pass filter circuitEnd is connected.
4. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 3,It is characterized in that: described non-linear compensation circuit is by triode VT1, triode VT2, triode VT3,The N utmost point is connected with the base stage of triode VT1 after resistance R 1, the P utmost point after capacitor C 1 with triode VT2The diode D1 that is connected of base stage, negative pole is connected with the colelctor electrode of triode VT3, positive pole is through resistanceThe capacitor C 2 being connected with the emitter stage of triode VT1 after R2, anodal after resistance R 3 with triode VT3The capacitor C 3 that emitter stage is connected, negative pole is connected with the colelctor electrode of triode VT2, the P utmost point and three utmost pointsThe diode D2 that colelctor electrode is connected, the N utmost point is connected with analog to digital conversion circuit of pipe VT1, and PThe utmost point forms with the diode D3 that the N utmost point is connected, the N utmost point is connected with analog to digital conversion circuit of diode D2;The base stage of described triode VT3 is connected with the base stage of triode VT2, its colelctor electrode with analog-to-digital conversion electricityRoad is connected, and its emitter stage is connected with the emitter stage of triode VT2; The current collection of described triode VT2The utmost point is connected with analog to digital conversion circuit; The N utmost point of described diode D1 forms this non-linear compensation circuitInput.
5. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 4,It is characterized in that: analog-digital conversion circuit as described is by conversion chip U FET MOS, positive pole and triodeThe capacitor C 4 that the colelctor electrode of VT3 is connected, negative pole is connected with the drain electrode of FET MOS, negative poleAfter inductance L 1, be connected with the source electrode of FET MOS, the capacitor C 5 of plus earth, and the N utmost point withThe diode D4 group that the DIN pin of conversion chip U is connected, the P utmost point is connected with the positive pole of capacitor C 4Become; The VDD pin of described conversion chip U is connected with the positive pole of capacitor C 4, and its CS pin is with twoThe N utmost point of utmost point pipe D3 is connected, its GND pin simultaneously with source electrode and the triode of FET MOSThe colelctor electrode of VT2 is connected, and its OUTA pin is all connected with mu balanced circuit with REF pin; Described electricityThe negative pole that holds C5 is also connected with the N utmost point of diode D2.
6. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 5,It is characterized in that: described mu balanced circuit is by triode VT4 triode VT5, unidirectional thyristor D5, the P utmost pointThe output be connected with the emitter stage of triode VT5, the N utmost point forming this mu balanced circuit after resistance R 7Zener diode D7, anodal in turn after potentiometer R4 and resistance R 5 with the N utmost point of Zener diode D7The capacitor C 7 be connected, negative pole being connected with the base stage of triode VT5 after Zener diode D6, stringBe connected on the resistance R 6 between the base stage of triode VT5 and the OUTA pin of conversion chip U, and anodalThe electric capacity be connected with the base stage of triode VT4, negative pole being connected with the OUTA pin of conversion chip UC6 composition; The control end of described unidirectional thyristor D5 is connected with the control end of potentiometer R4, its N utmost pointBe connected with the positive pole of capacitor C 7, its P utmost point is connected with the emitter stage of triode VT4; Described threeThe base stage of utmost point pipe VT4 is connected with the REF pin of conversion chip U, its grounded collector; Described triodeThe grounded collector of VT5.
7. a kind of novel traceable alcohol content tester based on low-pass filter circuit according to claim 6,It is characterized in that: described conversion chip U is MAX522 integrated chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967080.2A CN105606835A (en) | 2015-12-21 | 2015-12-21 | Novel traceable alcometer based on low-pass filter circuit |
Applications Claiming Priority (1)
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Application publication date: 20160525 |