CN101788467A - Methane detection circuit - Google Patents
Methane detection circuit Download PDFInfo
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- CN101788467A CN101788467A CN 201010101413 CN201010101413A CN101788467A CN 101788467 A CN101788467 A CN 101788467A CN 201010101413 CN201010101413 CN 201010101413 CN 201010101413 A CN201010101413 A CN 201010101413A CN 101788467 A CN101788467 A CN 101788467A
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Abstract
The invention provides a methane detection circuit, comprising a single-chip circuit, a power supply circuit, a reference voltage circuit, an infrared light source, an infrared light source monitoring circuit, a methane infrared sensor, a sensor temperature amplifying circuit, a three-way low-pass filter amplifying circuit, a three-way high-pass filter amplifying circuit, a methane inhalation air pump, an air pump start/stop monitoring circuit, a keyboard circuit and a display circuit, wherein the single-chip circuit is connected with the infrared light source monitoring circuit and the air pump start/stop monitoring circuit; the methane infrared sensor is respectively connected with the sensor temperature amplifying circuit and the signal input end of the three-way low-pass filter amplifying circuit; the signal output end of the three-way low-pass filter amplifying circuit is respectively connected with the signal input end of the three-way high-pass filter amplifying circuit; the sensor temperature amplifying circuit and the signal output end of the three-way high-pass filter amplifying circuit are respectively connected with the single-chip circuit. The detection circuit provided by the invention has the advantages of complete function, real-time monitoring, multi-gas detection, high detection precision and stable circuit performance.
Description
Technical field
The present invention relates to a kind of testing circuit, specifically, relate to a kind of methane detection circuit.
Background technology
According to " national production and use of marsh gas engineering construction planning (2006-2010) " and " national production and use of marsh gas service system construction scheme (trying) ", national requirements is set up a biogas technology service network according to 400 family biogas users, and requires each site to be equipped with a biogas composition detection instrument; At present, the method that biogas detects mainly contains catalysis process and chemical absorption method, but this class methods accuracy of detection is low, and the life-span is short, and mainly measures CH4, and can not CO2 be detected; In addition, biogas production is actual to be a sweat, and in whole fermentation process, natural pond liquid pH value and natural pond liquid temp are the indexs of a particular importance, and, in actual applications, in order to improve the production efficiency of biogas, need usually to adopt sun power to heat for natural pond liquid, therefore, pH value and the temperature value of gathering natural pond liquid also are very important monitor control indexs, yet existing checkout equipment does not but have natural pond liquid PH to detect and natural pond liquid temp measuring ability.
For this reason, people are seeking a kind of desirable technical solution always.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of practical, perfect in shape and function, monitoring in real time, many gas detection, accuracy of detection height, the stable methane detection circuit of circuit performance are provided.
The technical solution adopted in the present invention is as follows: a kind of methane detection circuit comprises that single chip circuit, power circuit, reference voltage circuit, infrared light supply, infrared light supply supervisory circuit, biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, biogas suck air pump, air pump start and stop supervisory circuit, keyboard circuit and display circuit;
Wherein, described single chip circuit connects described infrared light supply supervisory circuit, and described infrared light supply supervisory circuit connects the current supply circuit of described infrared light supply; Described biogas infrared sensor connects the signal input part of described sensor temperature amplifying circuit, and the signal output part of described sensor temperature amplifying circuit connects described single chip circuit; Described biogas infrared sensor connects the signal input part of three tunnel low-pass filtering amplifying circuits respectively, the signal output part of three tunnel low-pass filtering amplifying circuits connects the signal input part of three tunnel high-pass filtering amplifying circuits respectively, and the signal output part of three tunnel high-pass filtering amplifying circuits connects described single chip circuit respectively; Described single chip circuit connects described air pump start and stop supervisory circuit, and described air pump start and stop supervisory circuit connects the current supply circuit that described biogas sucks air pump;
Described keyboard circuit is connected described single chip circuit respectively with described display circuit; Described power circuit connects single chip circuit, reference voltage circuit, infrared light supply supervisory circuit, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, air pump start and stop supervisory circuit, keyboard circuit and display circuit respectively so that working power to be provided; The reference voltage output end of described reference voltage circuit connects biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits and three tunnel high-pass filtering amplifying circuits respectively.
The relative prior art of the present invention has outstanding substantive distinguishing features and marked improvement, specifically, this methane detection circuit adopts the second amplifying circuit of precision height, stable performance according to the characteristic of sensor, makes it have practical, perfect in shape and function, monitoring in real time, many gas detection, accuracy of detection height, the stable advantage of circuit performance.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the circuit theory diagrams of described single chip circuit;
Fig. 3 is the circuit theory diagrams of described biogas signal acquisition circuit;
Fig. 4 is the circuit theory diagrams of described natural pond liquid signal acquisition circuit;
Fig. 5 is the circuit theory diagrams of described infrared light supply supervisory circuit;
Fig. 6 is the circuit theory diagrams of described air pump start and stop supervisory circuit;
Fig. 7 is the circuit theory diagrams of described keyboard circuit;
Fig. 8 is the circuit theory diagrams of described caution warning circuit;
Fig. 9 is the circuit theory diagrams of described display circuit;
Figure 10 is the circuit theory diagrams of described reference voltage circuit;
Figure 11 is the circuit theory diagrams of described power circuit.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of methane detection circuit comprises that single chip circuit, power circuit, reference voltage circuit, infrared light supply, infrared light supply supervisory circuit, biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, biogas suck air pump, air pump start and stop supervisory circuit, natural pond liquid PH and temperature sensor, signal amplification circuit, keyboard circuit and display circuit; Wherein, described single chip circuit connects described infrared light supply supervisory circuit, and described infrared light supply supervisory circuit connects the current supply circuit of described infrared light supply; Described biogas infrared sensor connects the signal input part of described sensor temperature amplifying circuit, and the signal output part of described sensor temperature amplifying circuit connects described single chip circuit; Described biogas infrared sensor connects the signal input part of three tunnel low-pass filtering amplifying circuits respectively, the signal output part of three tunnel low-pass filtering amplifying circuits connects the signal input part of three tunnel high-pass filtering amplifying circuits respectively, and the signal output part of three tunnel high-pass filtering amplifying circuits connects described single chip circuit respectively; Described single chip circuit connects described air pump start and stop supervisory circuit, and described air pump start and stop supervisory circuit connects the current supply circuit that described biogas sucks air pump; Described natural pond liquid PH and temperature sensor connect the signal input part of described signal amplification circuit, and the signal output part of described signal amplification circuit connects described single chip circuit; Described keyboard circuit is connected described single chip circuit respectively with described display circuit; Described power circuit connects single chip circuit, reference voltage circuit, infrared light supply supervisory circuit, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, air pump start and stop supervisory circuit, signal amplification circuit, keyboard circuit and display circuit respectively so that working power to be provided; The reference voltage output end of described reference voltage circuit connects the zero potential incoming end of biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, signal amplification circuit respectively, so that raise the voltage of zero potential incoming end, be beneficial to the stable of circuit performance, be more conducive to the serviceability of the accurate and amplifying circuit of signals collecting.
Based on above-mentioned, as shown in Figure 2, single chip circuit comprises single-chip microcomputer MSP1 and is connected crystal oscillator Y1, capacitor C 38, capacitor C 165, resistance R 37, resistance R 38, the storage chip U7 of SCM peripheral.
Based on above-mentioned, as shown in Figure 3, described low-pass filtering amplifying circuit comprises gain resistor, gain amplifier resistance, building-out capacitor, operational amplifier, build-out resistor, filter capacitor and wave filter, wherein, described gain resistor one end connects described gain amplifier resistance one end, described gain amplifier resistance is connected in parallel between the negative input end and output terminal of described operational amplifier, described building-out capacitor is connected in parallel on described gain amplifier resistance two ends, described build-out resistor one end connects the signal input part of described filter capacitor one end and described wave filter respectively, and the signal output part of described wave filter connects the positive input terminal of described operational amplifier; Described build-out resistor is used to connect described biogas infrared sensor, the zero potential incoming end of the described gain resistor other end, the described filter capacitor other end and described wave filter is respectively applied for the reference voltage output end that is connected described reference voltage circuit, the feeder ear of described operational amplifier is used to connect described power circuit, and the output terminal of described operational amplifier is as the signal output part of low-pass filtering amplifying circuit;
Described high-pass filtering amplifying circuit comprises adjusts gain resistor, adjustment gain amplifier resistance, lead compensation electric capacity, computing amplification chip, resistance and electric capacity, wherein, described adjustment gain resistor one end connects described adjustment gain amplifier resistance one end, described adjustment gain amplifier resistance is connected in parallel on described computing and amplifies between the negative input end and output terminal of chip, described lead compensation electric capacity is connected in parallel on described adjustment gain amplifier resistance two ends, and described electric capacity one end connects the positive input terminal of described resistance one end and described computing amplification chip respectively; Described electric capacity is used to connect the signal output part of described low-pass filtering amplifying circuit, the described adjustment gain resistor other end is respectively applied for the reference voltage output end that is connected described reference voltage circuit with the described resistance other end, the feeder ear that chip is amplified in described computing is used to connect described power circuit, and the output terminal of described computing amplification chip is used for the signal output part of high-pass filtering amplifying circuit;
Specifically, first via low-pass filtering amplifying circuit and first via high-pass filtering amplifying circuit are to be used for CO
2The signal amplification circuit of gas, wherein, form first via low-pass filtering amplifying circuit by gain resistor R1, gain amplifier resistance R 9, building-out capacitor C1, operational amplifier U1D, build-out resistor R2, filter capacitor C16 and wave filter N1, form first via high-pass filtering amplifying circuit by adjusting gain resistor R10, adjustment gain amplifier resistance R 16, lead compensation capacitor C 6, computing amplification chip U2C, resistance R 13 and capacitor C 13; The second tunnel low-pass filtering amplifying circuit and the second tunnel high-pass filtering amplifying circuit are to be used for CH
4The signal amplification circuit of gas, wherein, form the second tunnel low-pass filtering amplifying circuit by gain resistor R3, gain amplifier resistance R 8, building-out capacitor C3, operational amplifier U1B, build-out resistor R4, filter capacitor C17 and wave filter N2, form the second tunnel high-pass filtering amplifying circuit by adjusting gain resistor R11, adjustment gain amplifier resistance R 17, lead compensation capacitor C 8, computing amplification chip U2A, resistance R 14 and capacitor C 14; Third Road low-pass filtering amplifying circuit and Third Road high-pass filtering amplifying circuit are the reference signal amplifying circuits that is used for the biogas infrared sensor, wherein, form Third Road low-pass filtering amplifying circuit by gain resistor R5, gain amplifier resistance R 7, building-out capacitor C4, operational amplifier U1A, build-out resistor R6, filter capacitor C18 and wave filter N3, form Third Road high-pass filtering amplifying circuit by adjusting gain resistor R12, adjustment gain amplifier resistance R 18, lead compensation capacitor C 9, computing amplification chip U2B, resistance R 15 and capacitor C 15.
Based on above-mentioned, as shown in Figure 3, described sensor temperature amplifying circuit comprises resistance R 19, capacitor C 5 and operational amplifier U1C, wherein, described resistance R 19 1 ends connect the positive input terminal of described capacitor C 5 one ends and described operational amplifier U1C respectively, and the negative input end of described operational amplifier U1C connects the output terminal of described operational amplifier U1C; Described resistance R 19 1 ends are used to connect described biogas infrared sensor NDIR, described resistance R 19 other ends are used to connect described power circuit, described capacitor C 5 other ends are used to connect the reference voltage output end of described reference voltage circuit, and the output terminal of described operational amplifier U1C is as the signal output part of sensor temperature amplifying circuit; Resistance R 19, capacitor C 5 and operational amplifier U1C composition are followed operation amplifier circuit;
Wherein, biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits and three tunnel high-pass filtering amplifying circuits are formed the biogas signal acquisition circuit.
Based on above-mentioned, as shown in Figure 4, described signal amplification circuit comprises natural pond liquid temp signal amplification circuit and natural pond liquid PH signal amplification circuit; Wherein, described natural pond liquid PH signal amplification circuit comprises high resistant computing amplification chip U4, the high resistant computing is amplified chip and is followed resistance R 20, resistance 21, resistance 22, resistance 23, resistance 24 and operational amplifier U2D, wherein, described resistance 23 1 ends connect described resistance 24 1 ends, described resistance 23 other end ground connection, described resistance 24 two ends are connected in parallel between the negative input end and output terminal of described operational amplifier U2D, described resistance 21 1 ends, described resistance 22 1 ends connect the positive input terminal of described operational amplifier U2D respectively, and the signal output part that chip U4 is amplified in described high resistant computing connects described resistance 21 other ends; Described resistance 22 other ends are used to connect the reference voltage output end of described reference voltage circuit, the feeder ear that chip U4 and described operational amplifier U2D are amplified in described high resistant computing is used to be connected described power circuit, the signal input part that chip U4 is amplified in described high resistant computing is used to connect described natural pond liquid PH and temperature sensor PHNTC, and the output terminal of described operational amplifier U2D connects single chip circuit with output natural pond liquid PH signal; Wherein, chip U4 is amplified in the high resistant computing and high resistant computing amplification chip is followed resistance R 20 composition PH one-level amplifying circuits, and resistance 21, resistance 22, resistance 23, resistance 24 and operational amplifier U2D form PH secondary differential amplifier circuit;
Described natural pond liquid temp signal amplification circuit comprises filter capacitor C69, filter capacitor C49, divider resistance R43, resistance R 44 and capacitor C 68, wherein, described filter capacitor C69 one end connects described divider resistance R43, filter capacitor C49 and described resistance R 44 1 ends respectively, described resistance R 44 other ends connect described capacitor C 68 1 ends, the other end ground connection of described filter capacitor C69, filter capacitor C49 and described capacitor C 68; The described divider resistance R43 other end is used to connect the reference voltage output end of described reference voltage circuit, described resistance R 44 other ends connect described single chip circuit with output natural pond liquid temp signal, and the described filter capacitor C69 other end is used to connect described natural pond liquid PH and temperature sensor PHNTC;
Described natural pond liquid PH signal amplification circuit also comprises: the voltage reversal circuit of being made up of capacitor C 20, capacitor C 21 and voltage reversal chip U3, and the RC filtering circuit of being made up of resistance R 47 and capacitor C 70; Reversal voltage is exported to the high resistant computing and is amplified chip U4 after the filtering of RC filtering circuit;
Wherein, natural pond liquid PH and temperature sensor, natural pond liquid temp signal amplification circuit and natural pond liquid PH signal amplification circuit are formed natural pond liquid signal acquisition circuit.
In the present invention, operational amplifier U1A, operational amplifier U1B, operational amplifier U1C, operational amplifier U1D are No. four integrated operational amplifier chip U1 that adopt, and chip U2A, computing amplification chip U2B are amplified in computing, No. four integrated operational amplifier chip U2 that chip U2C, operational amplifier U2D are employings are amplified in computing.
Based on above-mentioned, as shown in Figure 5, described infrared light supply supervisory circuit comprises power management chip U11, discharges resistance R 65, filter capacitor C29, resistance R 41, resistance R 42, capacitor C 40, capacitor C 45 and light emitting diode D13; Wherein, described release resistance R 65 1 ends connect the signal input end of described power management chip U11, described release resistance R 65 other end ground connection; The voltage output end of described power management chip U11 connects described filter capacitor C29, resistance R 41, resistance R 42 1 ends respectively, described filter capacitor C29 other end ground connection; Ground connection behind described resistance R 41 other ends connection light emitting diode D13, described resistance R 42 other ends connect capacitor C 40, capacitor C 45 back ground connection respectively; The voltage output end of described power management chip U11 is used to connect described infrared light supply GY one end, described infrared light supply GY other end ground connection; The signal input end of described power management chip U11 connects described single chip circuit to obtain control signal, and the voltage input end of described power management chip U11 connects described power circuit to obtain working power.
Based on above-mentioned, as shown in Figure 6, described air pump start and stop supervisory circuit comprises power management chip U8, discharges resistance R 67, filter capacitor C30, filter capacitor C42, sample resistance R32, diode D1, resistance R 33 and capacitor C 35; Wherein, described release resistance R 67 1 ends connect the signal input end of described power management chip U8, described release resistance R 67 other end ground connection; The voltage output end of described power management chip U8 connects described filter capacitor C30 and described filter capacitor C42 one end respectively, described filter capacitor C30 and filter capacitor C42 other end ground connection; Described sample resistance R32 one end connects described resistance R 33 1 ends, described resistance R 33 other ends connect described capacitor C 35 1 ends, the described sample resistance R32 other end and described capacitor C 35 other ends are ground connection respectively, and wherein, resistance R 33 and capacitor C 35 are formed the RC filtering circuit; The voltage output end of described power management chip U8 is used to connect power supply one end that described biogas sucks air pump, described sample resistance R32 one end is used to connect the power supply other end that described biogas sucks air pump, and diode D1 is connected in parallel on the power supply two ends that biogas sucks air pump motor MOTOR; Described resistance R 33 other ends connect described single chip circuit with the output monitoring signal, the signal input end of described power management chip U8 connects described single chip circuit to obtain control signal, and the voltage input end of described power management chip U8 connects described power circuit to obtain working power.
Based on above-mentioned, as shown in Figure 7, described keyboard circuit comprises button S1, button S2, button S3, button S4, resistance R 29, resistance R 30, resistance R 31, resistance R 48, capacitor C 47, capacitor C 33, capacitor C 34, capacitor C 41.
Based on above-mentioned, as shown in Figure 8, this methane detection circuit also comprises the caution warning circuit, and described caution warning circuit connects described single chip circuit and described power circuit respectively; Described caution warning circuit comprises resistance R 34, resistance R 35, resistance R 36, hummer B1 and triode Q1.
Based on above-mentioned, as shown in Figure 9, described display circuit comprises LCDs J400, resistance R 72, resistance R 73, triode Q2 and backlight LED1.
Based on above-mentioned, as shown in figure 10, described reference voltage circuit comprises reference voltage chip U5 and resistance R 26, capacitor C 11 and capacitor C 19.
Based on above-mentioned, as shown in figure 11, described power circuit comprises battery BT1, battery control circuit, battery booster circuit, filtering circuit, cell voltage supervisory circuit, external power source interface circuit and electric power management circuit.
This methane detection circuit is used for detecting the CH that biogas production process produces
4, CO
2Concentration and be used to detect natural pond liquid pH value and natural pond liquid temp value; In the present invention, adopt the master element of MSP430F24X single-chip microcomputer, the infrared modulation signal of a characteristic frequency is provided for the biogas infrared sensor as circuit, simultaneously, the biogas infrared sensor produces the signal of same frequency by the irradiation of infrared light, through amplifying, send into master element again; The output signal of described natural pond liquid PH and temperature sensor is sent into master element after amplifying; Master element is by calculating and handle the signal that collects, thereby calculates CH in the current sample gas
4, CO
2Percent concentration and the temperature value of natural pond liquid pH value and current natural pond liquid, and show by display screen, simultaneously, can carry out human-computer interaction by key board; In the present invention, the mode that sample gas adopts air pump initiatively to suck is sent into the biogas infrared sensor, detects the back at the biogas infrared sensor and discharges.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (9)
1. methane detection circuit is characterized in that: this methane detection circuit comprises that single chip circuit, power circuit, reference voltage circuit, infrared light supply, infrared light supply supervisory circuit, biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, biogas suck air pump, air pump start and stop supervisory circuit, keyboard circuit and display circuit;
Wherein, described single chip circuit connects described infrared light supply supervisory circuit, and described infrared light supply supervisory circuit connects the current supply circuit of described infrared light supply; Described biogas infrared sensor connects the signal input part of described sensor temperature amplifying circuit, and the signal output part of described sensor temperature amplifying circuit connects described single chip circuit; Described biogas infrared sensor connects the signal input part of three tunnel low-pass filtering amplifying circuits respectively, the signal output part of three tunnel low-pass filtering amplifying circuits connects the signal input part of three tunnel high-pass filtering amplifying circuits respectively, and the signal output part of three tunnel high-pass filtering amplifying circuits connects described single chip circuit respectively; Described single chip circuit connects described air pump start and stop supervisory circuit, and described air pump start and stop supervisory circuit connects the current supply circuit that described biogas sucks air pump;
Described keyboard circuit is connected described single chip circuit respectively with described display circuit; Described power circuit connects single chip circuit, reference voltage circuit, infrared light supply supervisory circuit, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits, three tunnel high-pass filtering amplifying circuits, air pump start and stop supervisory circuit, keyboard circuit and display circuit respectively so that working power to be provided; The reference voltage output end of described reference voltage circuit connects biogas infrared sensor, sensor temperature amplifying circuit, three tunnel low-pass filtering amplifying circuits and three tunnel high-pass filtering amplifying circuits respectively.
2. methane detection circuit according to claim 1, it is characterized in that: this methane detection circuit also comprises natural pond liquid PH and temperature sensor and signal amplification circuit, wherein, described natural pond liquid PH and temperature sensor connect the signal input part of described signal amplification circuit, and the signal output part of described signal amplification circuit connects described single chip circuit; Described power circuit connects described signal amplification circuit so that working power to be provided, and the reference voltage output end of described reference voltage circuit connects described signal amplification circuit.
3. methane detection circuit according to claim 2 is characterized in that: described signal amplification circuit comprises natural pond liquid temp signal amplification circuit and natural pond liquid PH signal amplification circuit;
Wherein, described natural pond liquid PH signal amplification circuit comprises high resistant computing amplification chip (U4), resistance (21), resistance (22), resistance (23), resistance (24) and operational amplifier (U2D), wherein, described resistance (23) one ends connect described resistance (24) one ends, described resistance (23) other end ground connection, described resistance (24) two ends are connected in parallel between the negative input end and output terminal of described operational amplifier (U2D), described resistance (21) one ends, described resistance (22) one ends connect the positive input terminal of described operational amplifier (U2D) respectively, and the signal output part that chip (U4) is amplified in described high resistant computing connects described resistance (21) other end; Described resistance (22) other end is used to connect the reference voltage output end of described reference voltage circuit, the feeder ear that chip (U4) and described operational amplifier (U2D) are amplified in described high resistant computing is used to be connected described power circuit, the signal input part that chip (U4) is amplified in described high resistant computing is used to connect described natural pond liquid PH and temperature sensor, and the output terminal of described operational amplifier (U2D) connects described single chip circuit;
Described natural pond liquid temp signal amplification circuit comprises filter capacitor (C69), divider resistance (R43), resistance (R44) and electric capacity (C68), wherein, described filter capacitor (C69) end connects described divider resistance (R43) end and described resistance (R44) end respectively, described resistance (R44) other end connects described electric capacity (C68) end, described filter capacitor (C69) other end and described electric capacity (C68) other end ground connection; Described divider resistance (R43) other end is used to connect the reference voltage output end of described reference voltage circuit, described resistance (R44) other end is used to connect described single chip circuit, and described filter capacitor (C69) other end is used to connect described natural pond liquid PH and temperature sensor.
4. methane detection circuit according to claim 1 is characterized in that: this methane detection circuit also comprises the caution warning circuit, and described caution warning circuit connects described single chip circuit and described power circuit respectively.
5. methane detection circuit according to claim 1, it is characterized in that: described low-pass filtering amplifying circuit comprises gain resistor, gain amplifier resistance, building-out capacitor, operational amplifier, build-out resistor, filter capacitor and wave filter, wherein, described gain resistor one end connects described gain amplifier resistance one end, described gain amplifier resistance is connected in parallel between the negative input end and output terminal of described operational amplifier, described building-out capacitor is connected in parallel on described gain amplifier resistance two ends, described build-out resistor one end connects the signal input part of described filter capacitor one end and described wave filter respectively, and the signal output part of described wave filter connects the positive input terminal of described operational amplifier; Described build-out resistor is used to connect described biogas infrared sensor, the zero potential incoming end of the described gain resistor other end, the described filter capacitor other end and described wave filter is respectively applied for the reference voltage output end that is connected described reference voltage circuit, the feeder ear of described operational amplifier is used to connect described power circuit, and the output terminal of described operational amplifier is as the signal output part of low-pass filtering amplifying circuit.
6. methane detection circuit according to claim 1, it is characterized in that: described high-pass filtering amplifying circuit comprises the adjustment gain resistor, adjust gain amplifier resistance, lead compensation electric capacity, chip is amplified in computing, resistance and electric capacity, wherein, described adjustment gain resistor one end connects described adjustment gain amplifier resistance one end, described adjustment gain amplifier resistance is connected in parallel on described computing and amplifies between the negative input end and output terminal of chip, described lead compensation electric capacity is connected in parallel on described adjustment gain amplifier resistance two ends, and described electric capacity one end connects the positive input terminal of described resistance one end and described computing amplification chip respectively; Described electric capacity is used to connect the signal output part of described low-pass filtering amplifying circuit, the described adjustment gain resistor other end is respectively applied for the reference voltage output end that is connected described reference voltage circuit with the described resistance other end, the feeder ear that chip is amplified in described computing is used to connect described power circuit, and the output terminal of described computing amplification chip is used for the signal output part of high-pass filtering amplifying circuit.
7. methane detection circuit according to claim 1, it is characterized in that: described sensor temperature amplifying circuit comprises resistance (R19), electric capacity (C5) and operational amplifier (U1C), wherein, described resistance (R19) end connects the positive input terminal of described electric capacity (C5) end and described operational amplifier (U1C) respectively, and the negative input end of described operational amplifier (U1C) connects the output terminal of described operational amplifier (U1C); Described resistance (R19) end is used to connect described biogas infrared sensor, described resistance (R19) other end is used to connect described power circuit, described electric capacity (C5) other end is used to connect the reference voltage output end of described reference voltage circuit, and the output terminal of described operational amplifier (U1C) is as the signal output part of sensor temperature amplifying circuit.
8. methane detection circuit according to claim 1, it is characterized in that: described infrared light supply supervisory circuit comprises power management chip (U11), discharges resistance (R65) and filter capacitor (C29), wherein, described release resistance (R65) end connects the signal input end of described power management chip (U11), described release resistance (R65) other end ground connection, the voltage output end of described power management chip (U11) connects described filter capacitor (C29) end, described filter capacitor (C29) other end ground connection; The voltage output end of described power management chip (U11) is used to connect described infrared light supply one end, described infrared light supply other end ground connection, the signal input end of described power management chip (U11) is used to connect described single chip circuit, and the voltage input end of described power management chip (U11) is used to connect described power circuit.
9. methane detection circuit according to claim 1, it is characterized in that: described air pump start and stop supervisory circuit comprises power management chip (U8), discharge resistance (R67), filter capacitor (C30), sample resistance (R32), resistance (R33) and electric capacity (C35), wherein, described release resistance (R67) end connects the signal input end of described power management chip (U8), described release resistance (R67) other end ground connection, the voltage output end of described power management chip (U8) connects described filter capacitor (C30) end, described filter capacitor (C30) other end ground connection, described sample resistance (R32) end connects described resistance (R33) end, described resistance (R33) other end connects described electric capacity (C35) end, and described sample resistance (R32) other end and described electric capacity (C35) other end be ground connection respectively; The voltage output end of described power management chip (U8) is used to connect power supply one end that described biogas sucks air pump, described sample resistance (R32) end is used to connect the power supply other end that described biogas sucks air pump, described resistance (R33) other end is used to connect described single chip circuit, the signal input end of described power management chip (U8) is used to connect described single chip circuit, and the voltage input end of described power management chip (U8) is used to connect described power circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010101413 CN101788467B (en) | 2010-01-27 | 2010-01-27 | Methane detection circuit |
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|---|---|---|---|
| CN 201010101413 CN101788467B (en) | 2010-01-27 | 2010-01-27 | Methane detection circuit |
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| CN101788467B CN101788467B (en) | 2012-02-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393374A (en) * | 2011-07-26 | 2012-03-28 | 秦皇岛市康泰医学系统有限公司 | Infrared measuring method and device for end expiration CO2 |
| CN104893971A (en) * | 2015-06-01 | 2015-09-09 | 张家港市天源机械制造有限公司 | Intelligent monitoring device of biogas engineering anaerobic fermentation system |
| CN108566170A (en) * | 2018-04-14 | 2018-09-21 | 芜湖拓达电子科技有限公司 | A kind of operation amplifier circuit |
| CN111121859A (en) * | 2018-10-31 | 2020-05-08 | 卉森(上海)生物科技有限公司 | Biogas slurry concentration real-time detection device |
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2010
- 2010-01-27 CN CN 201010101413 patent/CN101788467B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393374A (en) * | 2011-07-26 | 2012-03-28 | 秦皇岛市康泰医学系统有限公司 | Infrared measuring method and device for end expiration CO2 |
| CN102393374B (en) * | 2011-07-26 | 2013-06-05 | 秦皇岛市康泰医学系统有限公司 | Infrared measuring method and device for CO2 expirated in the end |
| CN104893971A (en) * | 2015-06-01 | 2015-09-09 | 张家港市天源机械制造有限公司 | Intelligent monitoring device of biogas engineering anaerobic fermentation system |
| CN108566170A (en) * | 2018-04-14 | 2018-09-21 | 芜湖拓达电子科技有限公司 | A kind of operation amplifier circuit |
| CN111121859A (en) * | 2018-10-31 | 2020-05-08 | 卉森(上海)生物科技有限公司 | Biogas slurry concentration real-time detection device |
| CN111121859B (en) * | 2018-10-31 | 2022-09-20 | 卉森(上海)生物科技有限公司 | Biogas slurry concentration real-time detection device |
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