CN105608846A - High precision wireless natural gas detector based on notch filter circuit - Google Patents
High precision wireless natural gas detector based on notch filter circuit Download PDFInfo
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- CN105608846A CN105608846A CN201510964061.4A CN201510964061A CN105608846A CN 105608846 A CN105608846 A CN 105608846A CN 201510964061 A CN201510964061 A CN 201510964061A CN 105608846 A CN105608846 A CN 105608846A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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Abstract
The invention discloses a high precision wireless natural gas detector based on a notch filter circuit, the detector is formed by a microcontroller, an air sensor, a power supply, a display device, an alarm device, a storage device, a self-gain amplification circuit, a wireless receiving circuit, an A/D conversion chip and a wireless transmitting circuit; wherein the power supply, the display device, the alarm device, the storage device and the self-gain amplification circuit are separately connected with the microcontroller, the wireless receiving circuit is connected with the self-gain amplification circuit, the A/D conversion chip is connected with the air sensor, the wireless transmitting circuit is connected with the A/D conversion chip, and the wireless transmitting circuit is connected with the wireless receiving circuit through a wireless network; and the detector is characterized in that the notch filter circuit is connected between the gain amplification circuit and the microcontroller in series. The detector can transmit the signal through the wireless network, detection staffs can detect if the natural gas leaks without attending by themselves, so that the security guarantee of the detection staffs is provided. The notch filter circuit is arranged on the detector, the notch filter circuit can filter interference signal of signals, and the influence caused by the interference signal for the detection precision of the detector is avoided.
Description
Technical field
The present invention relates to a kind of detector, specifically refer to a kind of high precision wireless sky based on notch filter circuitCombustion gas detector.
Background technology
Along with natural gas is more and more universal, people also more and more pay attention to the use safety of natural gas. People nowConventionally whether have leakage if detecting natural gas with portable natural gas detector, but natural gas itself existsThe features such as rapid, the easy blast of diffusion, after micro-natural gas leaks, in wind-force, environment temperature etc.Under the acting in conjunction of external condition, leakage point can expand rapidly, will shape within the extremely short time of the scene of the accidentBecome large-area disaster hazardous area, be tested with a day combustion when people use traditional portable natural gas detectorWhen revealing, gas as testing staff cannot withdraw at short notice, easily cause Site Detection personnel to occur poisoningSituation.
Summary of the invention
The object of the invention is to overcome traditional natural gas detector can only use at Test Field, gives and detectsPersonnel bring the defect of personal safety hidden danger, and a kind of high precision wireless sky combustion based on notch filter circuit is providedGas detector.
Object of the present invention is achieved through the following technical solutions: a kind of high accuracy based on notch filter circuit withoutLine natural gas detector, mainly by microcontroller, gas sensor, the electricity being connected with microcontroller respectivelySource, display, alarm, holder and from gain amplifying circuit, and be connected from gain amplifying circuitWireless receiving circuit, the A/D conversion chip being connected with gas sensor, and with A/D conversion chip phaseThe radio transmitter composition connecting; Described radio transmitter is by wireless network and wireless receiving circuit phaseConnect; In order better to implement the present invention, the present invention is also going here and there between gain amplifying circuit and microcontrollerBe connected to notch filter circuit.
Further, described notch filter electricity routing amplifier P5, amplifier P4, triode VT7, positive poleAfter diode D6, be connected with the negative pole of amplifier P5, negative pole after resistance R 18 with amplifier P4The capacitor C 10 that is connected of output, anodal in turn after resistance R 16 and resistance R 17 with capacitor C 10The capacitor C 9 that positive pole is connected, negative pole is connected with the output of amplifier P4 after diode D5, stringBe connected on the resistance R 20 between positive pole and the output of amplifier P5, the colelctor electrode phase of the P utmost point and triode VT7The diode D7 connect, the N utmost point being connected with the output of amplifier P4 after resistance R 19, Yi JizhengThe capacitor C 11 that the utmost point is connected with the positive pole of amplifier P4, negative pole is connected with the base stage of triode VT7Composition; The positive pole of described amplifier P4 is connected with the tie point of resistance R 17 with resistance R 16, and its negative pole connectsGround; The emitter stage of described triode VT7 forms this trap filter when being connected with the output of amplifier P5The output of wave circuit is also connected with microcontroller; The positive pole of described capacitor C 9 forms this notch filter electricityThe input on road is also connected with the output from gain amplifying circuit.
Described from gain amplifying circuit by amplifier P1, amplifier P2, amplifier P3, triode VT5,Triode VT6, is serially connected in the resistance R 11 between the negative pole of amplifier P1 and the positive pole of amplifier P2, justThe utmost point is connected with the negative pole of amplifier P1 after resistance R 13, negative pole after resistance R 14 with amplifier P3The capacitor C 8 that is connected of positive pole, be serially connected between the positive pole of amplifier P3 and the emitter stage of triode VT6Resistance R 15, be serially connected in the inductance L 3 between the negative pole of amplifier P3 and the colelctor electrode of triode VT5,And the resistance R 12 being serially connected between the positive pole of amplifier P2 and the base stage of triode VT5 forms; DescribedThe minus earth of amplifier P2, its output is connected with emitter stage with the base stage of triode VT5 simultaneously;The base stage of described triode VT6 is connected with the colelctor electrode of triode VT5, its grounded collector; Described puttingThe output of large device P3 form this from the output of gain amplifying circuit and with the input of notch filter circuitBe connected; The output of described amplifier P1 is connected with the positive pole of capacitor C 8, and its positive pole forms this certainlyThe input of gain amplifying circuit is also connected with the signal output part of wireless receiving circuit.
Described radio transmitter is by mixting circuit, the common emitter amplifying circuit being connected with mixting circuit, withAnd the radiating circuit being connected with common emitter amplifying circuit composition.
Described mixting circuit is by transformer T, triode VT1, triode VT2, one end and transformer T'sThe resistance R 1 that the Same Name of Ends of former limit inductance coil is connected, the other end connects 5V voltage, is serially connected in transformer TThe Same Name of Ends of former limit inductance coil and the base stage of triode VT1 between resistance R 2, positive pole and triodeThe electric capacity that the colelctor electrode of VT1 is connected, negative pole is connected with the base stage of triode VT1 after inductance L 1C2, when the N utmost point is connected with the negative pole of capacitor C 2 ground connection, the P utmost point after capacitor C 1 with triode VT1The diode D1 that is connected of base stage, with the resistance R 3 that inductance L 1 is in parallel, anodal and transformer T's is formerThe Same Name of Ends of limit inductance coil is connected, the capacitor C of minus earth 3, is serially connected in the anodal of capacitor C 3 and becomesResistance R 4 between the centre tap of the secondary inductance coil of depressor T, the secondary inductance of the N utmost point and transformer TThe diode D2 that the non-same polarity of coil is connected, the P utmost point is connected with the base stage of triode VT2, the P utmost pointBe connected with the Same Name of Ends of the secondary inductance coil of transformer T, the N utmost point is connected with the base stage of triode VT2The diode D3 connecing, and one end is connected with the base stage of triode VT2 after resistance R 5, the other endThe resistance R 6 being connected with A/D conversion chip forms; The emitter stage of described triode VT1 and transformer TThe non-same polarity of former limit inductance coil be connected; The base stage of described triode VT2 and colelctor electrode are all and cascodeUtmost point amplifying circuit is connected, and its emitter stage is connected with the positive pole of capacitor C 3.
Described common emitter amplifying circuit is by amplifier P, triode VT3, and FET MOS, is serially connected in and putsResistance R 7 between the large output of device P and the base stage of triode VT3, the output of the N utmost point and amplifier PThe diode D4 be connected, the P utmost point being connected with the grid of FET MOS, anodal and amplifier PThe capacitor C 4 that negative pole is connected, negative pole is connected with the P utmost point of diode D4, and anodal and three utmost pointsThe colelctor electrode of pipe VT3 is connected, the capacitor C 6 of minus earth forms; The positive pole of described amplifier P and threeThe base stage of utmost point pipe VT2 is connected, and its negative pole is connected with the source electrode of FET MOS, its outputBe connected with radiating circuit with the colelctor electrode of while triode VT2; The drain electrode of described FET MOSGround connection; The emitter stage of described triode VT3 is connected with radiating circuit.
Described radiating circuit is by triode VT4, be anodally connected with the output of amplifier P, negative pole withThe capacitor C 5 that the base stage of triode VT4 is connected, is serially connected in base stage and the triode VT3 of triode VT4Emitter stage between resistance R 8, be serially connected in the colelctor electrode of triode VT4 and the emitter stage of triode VT3Between resistance R 10, one end is connected with the base stage of triode VT4, the other end after inductance L 2 with threeThe resistance R 9 that the emitter stage of utmost point pipe VT4 is connected, and positive pole is connected with the emitter stage of triode VT4,The capacitor C 7 that negative pole connects antenna forms; The tie point of described resistance R 9 and inductance L 2 connects 12V voltage.
The present invention compares compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is transmitted signal by wireless network, and testing staff does not need body to face Test FieldCan detect and whether have natural gas to reveal, thereby provide safety guarantee to testing staff.
(2) the present invention is transmitted signal by radio transmitter, and it can be processed signal,Make signal more stable in the process of long Distance Transmission, thereby make the distance of signal transmission of the present invention farther.
(3) the present invention is provided with from gain amplifying circuit, and being somebody's turn to do can be to digital electric signal from gain amplifying circuitCarry out distortionless amplification, thereby compensating signal is because of the signal attenuation that long Distance Transmission produces, and makes microcontrollerThe received signal of device is more clear, has improved accuracy of detection of the present invention.
(4) the present invention is provided with notch filter circuit, and this notch filter circuit can filter out doing in signalDisturb signal, avoid interference effect of signals 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 radio transmitter of the present invention.
Fig. 3 is the structural representation from gain amplifying circuit of the present invention.
Fig. 4 is the structural representation of notch 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, the high precision wireless natural gas detector based on notch filter circuit of the present invention, mainWill be by microcontroller, gas sensor, the power supply being connected with microcontroller respectively, display, alarm,Holder and notch filter circuit, be connected with notch filter circuit from gain amplifying circuit, with certainly gainThe wireless receiving circuit that amplifying circuit is connected, the A/D conversion chip being connected with gas sensor, andThe radio transmitter composition being connected with A/D conversion chip; Described radio transmitter passes through wireless networkBe connected with wireless receiving circuit.
Wherein, gas sensor adopts the MD61 type natural gas that Shanghai Mei Si Electronic Science and Technology Co., Ltd. producesSensor, the sensor of natural gas of this model is highly sensitive, the life-span long, with low cost. This A/D conversion coreSheet is for being converted to digital electric signal the analog signal of gas sensor output, and it preferentially adopts ADC0809Type A/D conversion chip, the EOC pin of this ADC0809 type A/D conversion chip and gas sensor defeatedGo out end and be connected, its ALE pin is connected with the signal input part of radio transmitter. This wireless transmissionCircuit is for processing rear and send to by wireless network the digital electric signal of A/D conversion chip outputWireless receiving circuit. As shown in Figure 2, this radio transmitter, by mixting circuit, is connected with mixting circuitCommon emitter amplifying circuit, and the radiating circuit being connected with common emitter amplifying circuit composition.
Wherein, described mixting circuit is by transformer T, triode VT1, and triode VT2, resistance R 1,Resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, inductance L 1, capacitor C 1, capacitor C 2,Capacitor C 3, diode D1, diode D2 and diode D3 composition.
When connection, one end of resistance R 1 is connected with the Same Name of Ends of the former limit inductance coil of transformer T, it is anotherOne end connects 5V voltage. Resistance R 2 is serially connected in Same Name of Ends and the triode of the former limit inductance coil of transformer TBetween the base stage of VT1. The positive pole of capacitor C 2 is connected with the colelctor electrode of triode VT1, warp of its negative poleAfter inductance L 1, be connected with the base stage of triode VT1. The N utmost point of diode D1 and the negative pole phase of capacitor C 2When connection, ground connection, its P utmost point are connected with the negative pole of capacitor C 1. The positive pole of described capacitor C 1 withThe base stage of triode VT1 is connected. Resistance R 3 is in parallel with inductance L 1. The positive pole of capacitor C 3 and transformationThe Same Name of Ends of the former limit inductance coil of device T is connected, its minus earth. Resistance R 4 is serially connected in capacitor C 3Between the centre tap of the secondary inductance coil of positive pole and transformer T. The N utmost point of diode D2 and transformer TThe non-same polarity of secondary inductance coil be connected, its P utmost point is connected with the base stage of triode VT2. TwoThe P utmost point of utmost point pipe D3 is connected with the Same Name of Ends of the secondary inductance coil of transformer T, its N utmost point with three utmost pointsThe base stage of pipe VT2 is connected. One end of resistance R 6 is connected with the base stage of triode VT2 after resistance R 5Connect, its other end forms the signal input part of this mixting circuit and with ADC0809 type A/D conversion chipALE pin is connected. The former limit inductance coil of the emitter stage of described triode VT1 and transformer T non-withName end is connected. The base stage of described triode VT2 is all connected with common emitter amplifying circuit with colelctor electrode, itsEmitter stage is connected with the positive pole of capacitor C 3.
In said structure, capacitor C 1, diode D1, capacitor C 2 and triode VT1 composition vibration electricityRoad, it can produce a local oscillation signal, when the digital electric signal of A/D conversion chip output is from this mixting circuitSignal input part input into after, mixting circuit carries out mixing digital electric signal and its local oscillation signal, andOutput radiofrequency signal is to common emitter amplifying circuit.
Described common emitter amplifying circuit is by amplifier P, triode VT3, and FET MOS, is serially connected in and putsResistance R 7 between the large output of device P and the base stage of triode VT3, the output of the N utmost point and amplifier PThe diode D4 be connected, the P utmost point being connected with the grid of FET MOS, anodal and amplifier PThe capacitor C 4 that negative pole is connected, negative pole is connected with the P utmost point of diode D4, and anodal and three utmost pointsThe colelctor electrode of pipe VT3 is connected, the capacitor C 6 of minus earth forms.
The positive pole of this amplifier P is connected with the base stage of triode VT2, its negative pole with FET MOSSource electrode be connected, its output is connected with radiating circuit with the colelctor electrode of while triode VT2. InstituteState the grounded drain of FET MOS. The emitter stage of described triode VT3 is connected with radiating circuit.
After common emitter amplifying circuit carries out distortionless amplification, input and send out from the radiofrequency signal of mixting circuit outputRadio road, radiofrequency signal is after treatment more stable.
Described radiating circuit is by triode VT4, resistance R 8, resistance R 9, resistance R 10, inductance L 2, electricityHolding C5 and capacitor C 7 forms. When connection, the positive pole of capacitor C 5 is connected with the output of amplifier P,Its negative pole is connected with the base stage of triode VT4. Resistance R 8 is serially connected in the base stage and three of triode VT4Between the emitter stage of utmost point pipe VT3. Resistance R 10 is serially connected in colelctor electrode and the triode VT3 of triode VT4Emitter stage between. One end of resistance R 9 is connected with the base stage of triode VT4, its other end is through electricityAfter sense L2, be connected with the emitter stage of triode VT4. Anodal be connected with the emitter stage of triode VT4,The capacitor C 7 that negative pole connects antenna forms. The tie point of described resistance R 9 and inductance L 2 connects 12V voltage. ShouldRadiofrequency signal sends to wireless receiving circuit by radiating circuit by wireless network.
In addition, the radiofrequency signal that wireless receiving circuit sends for receiving radio transmitter. Amplify from gainCircuit can carry out distortionless amplification to digital electric signal, thereby compensating signal produces because growing Distance TransmissionSignal attenuation, make the received signal of microcontroller more clear, as shown in Figure 3, should from gain putLarge electric routing amplifier P1, amplifier P2, amplifier P3, triode VT5, triode VT6, resistanceR11, resistance R 12, resistance R 13, resistance R 14, resistance R 15, inductance L 3 and capacitor C 8 form.
Wherein, resistance R 11 is serially connected between the negative pole of amplifier P1 and the positive pole of amplifier P2. Capacitor C 8Positive pole after resistance R 13, be connected with the negative pole of amplifier P1, its negative pole after resistance R 14 with amplificationThe positive pole of device P3 is connected. Resistance R 15 is serially connected in the positive pole of amplifier P3 and the emitter stage of triode VT6Between. Inductance L 3 is serially connected between the negative pole of amplifier P3 and the colelctor electrode of triode VT5. Resistance R 12Be serially connected between the positive pole of amplifier P2 and the base stage of triode VT5. The minus earth of described amplifier P2,Its output is connected with emitter stage with the base stage of triode VT5 simultaneously. The base stage of described triode VT6Be connected with the colelctor electrode of triode VT5, its grounded collector; The output of described amplifier P3 formsShould be connected from the output of gain amplifying circuit and with the input of notch filter circuit. Described amplifier P1Output be connected with the positive pole of capacitor C 8, its positive pole forms this input from gain amplifying circuit alsoBe connected with the signal output part of wireless receiving circuit.
This amplifier P1 and amplifier P2 composition first order amplifying circuit, and amplifier P3, triode VT5And triode VT6 forms second level amplifying circuit, digital electric signal is through first order amplifying circuit and secondAfter amplifying, level amplifying circuit exports to microcontroller.
Notch filter circuit can filter out the interfering signal in signal, avoids interference effect of signals of the present inventionAccuracy of detection. As shown in Figure 4, this notch filter electricity routing amplifier P5, amplifier P4, triode VT7,Resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, capacitor C 9, capacitor C 10,Capacitor C 11, diode D5, diode D6 and diode D7 composition.
Wherein, the positive pole of capacitor C 10 is connected with the P utmost point of diode D6, its negative pole is through resistance R 18Be connected with the output of amplifier P4 afterwards. The N utmost point of described diode D6 and the negative pole phase of amplifier P5Connect. The positive pole of capacitor C 9 in turn through resistance R 16 be connected with the positive pole of capacitor C 10 after resistance R 17,Its negative pole is connected with the P utmost point of diode D5. The N utmost point of described diode D5 is with amplifier P4'sOutput is connected. Resistance R 20 is serially connected between the positive pole and output of amplifier P5; Diode D7'sThe P utmost point is connected with the colelctor electrode of triode VT7, defeated with amplifier P4 after resistance R 19 of its N utmost pointGoing out end is connected. The positive pole of capacitor C 11 is connected with the positive pole of amplifier P4, its negative pole with triodeThe base stage of VT7 is connected.
Meanwhile, the positive pole of described amplifier P4 is connected with the tie point of resistance R 17 with resistance R 16, and it is negativeUtmost point ground connection. The emitter stage of described triode VT7 forms this and falls into when being connected with the output of amplifier P5The output of ripple filter circuit is also connected with microcontroller. The positive pole of described capacitor C 9 forms this trap filterThe input of wave circuit is also connected with the output from gain amplifying circuit. After signal is inputted into by falling intoRipple filter circuit filters the interfering signal in signal, and this notch filter circuit is exported numeral clearlyThe signal of telecommunication is to microcontroller.
Microcontroller is as control centre of the present invention, and it preferentially adopts MAX716 type micro-chip processor,The B1 pin of this MAX716 type micro-chip processor is connected with the output of notch filter circuit, its UCCPin connects power supply, and its B7 pin connects display, and B5 pin is device taking alarm. This power supply is used for to microcontrollerDevice provides working power, and display is for showing the concentration value of natural gas, and alarm is for detectingWhile having natural gas to reveal, sound the alarm, this holder is for storing the concentration value of natural gas. This wireless interfaceReceiving circuit uses prior art to realize.
When work, if natural gas is not revealed, the present invention can not send alarm signal. When there being natural gasWhen leakage, gas sensor detects in air and has fuel gas, and the electrical conductivity of gas sensor is with skyThe increase of combustable gas concentration in gas and increasing, gas sensor is converted to the variation of electrical conductivity and this simultaneouslyThe analog signal that combustable gas concentration is corresponding is also exported to A/D change-over circuit. This A/D change-over circuit is mouldAnalog signal sends through radio transmitter after being converted to digital electric signal. This radio transmitter is to digital telecommunicationAfter number processing, send to wireless receiving circuit by wireless network, wireless receiving circuit is digital telecommunicationNumber send to from gain amplifying circuit, from gain amplifying circuit, digital electric signal is carried out after distortionless amplificationSend to notch filter circuit, notch filter circuit carried out the interfering signal being entrained in digital electric signalAfter filter, send to microcontroller. Natural gas is identified and be converted to microcontroller to the digital electric signal of inputAfter concentration signal, send to respectively display, holder and alarm, it is dense that this display demonstrates fuel gasDegree value, holder stores this natural gas concentration value, and alarm sounds the alarm simultaneously.
As mentioned above, just can well realize the present invention.
Claims (7)
1. the high precision wireless natural gas detector based on notch filter circuit, mainly by microcontroller,Gas sensor, the power supply being connected with microcontroller respectively, display, alarm, holder and increasing certainlyBenefit amplifying circuit, with the wireless receiving circuit being connected from gain amplifying circuit, is connected with gas sensorA/D conversion chip, and the radio transmitter being connected with A/D conversion chip composition; Described wirelessRadiating circuit is connected with wireless receiving circuit by wireless network; It is characterized in that, at the amplification electricity that certainly gainsBetween road and microcontroller, be also serially connected with notch filter circuit.
2. a kind of high precision wireless natural gas based on notch filter circuit according to claim 1 detectsInstrument, is characterized in that: described notch filter electricity routing amplifier P5, and amplifier P4, triode VT7, justThe utmost point is connected with the negative pole of amplifier P5 after diode D6, negative pole after resistance R 18 with amplifier P4The capacitor C 10 that is connected of output, anodal in turn after resistance R 16 and resistance R 17 with capacitor C 10The capacitor C 9 that positive pole is connected, negative pole is connected with the output of amplifier P4 after diode D5, stringBe connected on the resistance R 20 between positive pole and the output of amplifier P5, the colelctor electrode phase of the P utmost point and triode VT7The diode D7 connect, the N utmost point being connected with the output of amplifier P4 after resistance R 19, Yi JizhengThe capacitor C 11 that the utmost point is connected with the positive pole of amplifier P4, negative pole is connected with the base stage of triode VT7Composition; The positive pole of described amplifier P4 is connected with the tie point of resistance R 17 with resistance R 16, and its negative pole connectsGround; The emitter stage of described triode VT7 forms this trap filter when being connected with the output of amplifier P5The output of wave circuit is also connected with microcontroller; The positive pole of described capacitor C 9 forms this notch filter electricityThe input on road is also connected with the output from gain amplifying circuit.
3. a kind of high precision wireless natural gas based on notch filter circuit according to claim 2 detectsInstrument, is characterized in that: described from gain amplifying circuit by amplifier P1, amplifier P2, amplifier P3,Triode VT5, triode VT6, is serially connected between the negative pole of amplifier P1 and the positive pole of amplifier P2Resistance R 11 anodal is connected with the negative pole of amplifier P1, negative pole is through resistance R 14 after resistance R 13The capacitor C 8 being connected with the positive pole of amplifier P3 afterwards, is serially connected in positive pole and the triode VT6 of amplifier P3Emitter stage between resistance R 15, be serially connected between the negative pole of amplifier P3 and the colelctor electrode of triode VT5Inductance L 3, and be serially connected in the resistance R 12 between the positive pole of amplifier P2 and the base stage of triode VT5Composition; The minus earth of described amplifier P2, its output simultaneously with base stage and the transmitting of triode VT5The utmost point is connected; The base stage of described triode VT6 is connected with the colelctor electrode of triode VT5, and its colelctor electrode connectsGround; The output of described amplifier P3 form this from the output of gain amplifying circuit and with notch filter electricityThe input on road is connected; The output of described amplifier P1 is connected with the positive pole of capacitor C 8, its positive poleForming this is connected from the input of gain amplifying circuit and with the signal output part of wireless receiving circuit.
4. a kind of high precision wireless natural gas based on notch filter circuit according to claim 3 detectsInstrument, is characterized in that: described radio transmitter is by mixting circuit, the common emitter being connected with mixting circuitAmplifying circuit, and the radiating circuit being connected with common emitter amplifying circuit composition.
5. a kind of high precision wireless natural gas based on notch filter circuit according to claim 4 detectsInstrument, is characterized in that: described mixting circuit is by transformer T, triode VT1, triode VT2, one endWith the resistance R 1 that Same Name of Ends is connected, the other end connects 5V voltage of the former limit inductance coil of transformer T,Be serially connected in the resistance R 2 between the Same Name of Ends of former limit inductance coil and the base stage of triode VT1 of transformer T,Anodal be connected with the colelctor electrode of triode VT1, negative pole after inductance L 1 with the base stage of triode VT1The capacitor C 2 being connected, when the N utmost point is connected with the negative pole of capacitor C 2, ground connection, the P utmost point are through capacitor C 1The diode D1 being connected with the base stage of triode VT1 afterwards, with the resistance R 3 that inductance L 1 is in parallel, positive poleBe connected with the Same Name of Ends of the former limit inductance coil of transformer T, the capacitor C 3 of minus earth, be serially connected in electric capacityResistance R 4 between the centre tap of the secondary inductance coil of the positive pole of C3 and transformer T, the N utmost point and transformerThe non-same polarity of the secondary inductance coil of T is connected, the P utmost point is connected with the base stage of triode VT2 twoUtmost point pipe D2, the P utmost point is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the N utmost point with triode VT2The diode D3 that is connected of base stage, and one end is connected with the base stage of triode VT2 after resistance R 5,The resistance R 6 that the other end is connected with A/D conversion chip forms; The emitter stage of described triode VT1 withThe non-same polarity of the former limit inductance coil of transformer T is connected; The base stage of described triode VT2 and colelctor electrodeAll be connected with common emitter amplifying circuit, its emitter stage is connected with the positive pole of capacitor C 3.
6. a kind of high precision wireless natural gas based on notch filter circuit according to claim 5 detectsInstrument, is characterized in that: described common emitter amplifying circuit is by amplifier P, triode VT3, and FET MOS,Be serially connected in the resistance R 7 between the output of amplifier P and the base stage of triode VT3, the N utmost point and amplifier PThe diode D4 that output is connected, the P utmost point is connected with the grid of FET MOS, anodal withThe capacitor C 4 that the negative pole of amplifier P is connected, negative pole is connected with the P utmost point of diode D4, Yi JizhengThe utmost point is connected with the colelctor electrode of triode VT3, the capacitor C 6 of minus earth forms; Described amplifier P'sPositive pole is connected with the base stage of triode VT2, and its negative pole is connected with the source electrode of FET MOS,Its output is connected with radiating circuit with the colelctor electrode of while triode VT2; Described FET MOSGrounded drain; The emitter stage of described triode VT3 is connected with radiating circuit.
7. a kind of high precision wireless natural gas based on notch filter circuit according to claim 6 detectsInstrument, is characterized in that: described radiating circuit is by triode VT4, and positive pole is connected with the output of amplifier PThe capacitor C 5 connect, negative pole being connected with the base stage of triode VT4, is serially connected in the base stage of triode VT4And resistance R 8 between the emitter stage of triode VT3, be serially connected in colelctor electrode and the triode of triode VT4Resistance R 10 between the emitter stage of VT3, one end is connected with the base stage of triode VT4, warp of the other endThe resistance R 9 being connected with the emitter stage of triode VT4 after inductance L 2, and anodal and triode VT4The capacitor C 7 that emitter stage is connected, negative pole connects antenna forms; The tie point of described resistance R 9 and inductance L 2Connect 12V voltage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111596254A (en) * | 2020-06-12 | 2020-08-28 | 杭州万高科技股份有限公司 | Anomaly detection method, device, equipment and medium for energy metering chip |
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| CN111596254B (en) * | 2020-06-12 | 2021-11-09 | 杭州万高科技股份有限公司 | Anomaly detection method, device, equipment and medium for energy metering chip |
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