CN103293280A - Gas measuring apparatus, voltage stabilizing circuit and gas calibrating device - Google Patents
Gas measuring apparatus, voltage stabilizing circuit and gas calibrating device Download PDFInfo
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- CN103293280A CN103293280A CN2013102426818A CN201310242681A CN103293280A CN 103293280 A CN103293280 A CN 103293280A CN 2013102426818 A CN2013102426818 A CN 2013102426818A CN 201310242681 A CN201310242681 A CN 201310242681A CN 103293280 A CN103293280 A CN 103293280A
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Abstract
The invention relates to a gas measuring apparatus, which comprises an infrared methane sensor, an infrared carbon dioxide sensor, an electrochemical oxygen sensor, an electrochemical carbon oxide sensor, a CPU (central processing unit) control circuit, an alarming device, a battery, a voltage stabilizing circuit and an infrared receiving circuit, wherein an electric signal collected by the sensor device is transmitted to the CPU control circuit to be processed, and the alarming device is triggered when the processing result shows the existence of a safety potential danger. The invention also provides a voltage stabilizing circuit and a gas calibrating device. By adopting the technical scheme, the measuring range of the gas can be enlarged; the battery voltage can provide power supply source power for the measuring apparatus in any state that the battery stage is higher than, lower than or equal to the output voltage, even when the storage battery is almost completely discharged, the stable output voltage still can be guaranteed; and the control data is transmitted by utilizing the infrared remote controller to control the calibrating process of the measuring apparatus, and a sealed container which is fulfilled with the toxic gas is unnecessary to open, the contact of toxic gas can be efficiently avoided, and the leakage of the toxic gas can be efficiently prevented.
Description
Technical field
Patent of the present invention relates to a kind of apparatus for determination of gas, particularly, relates to a kind of multi-functional portable high range multiparameter gas determinator, and with its can matching used mu balanced circuit and gas caliberating device.
Background technology
Multiparameter gas determinator is continuous detecting CH simultaneously
4, O
2, CO, CO
2The concentration of totally 4 kinds of gases, but and overload alarm.Generally speaking, analyzer adopts 8 8-digit microcontrollers as control module, adopts the high precision detecting element, and is highly sensitive, response speed is fast, and screen adopts the liquid crystal of wide temperature range.When the concentration that detects gas to be measured in the environment is at or above or below when presetting alarming value, analyzer sends sound and light alarm immediately.
For example, application number is that the Chinese utility model patent of CN:200920106184.4 discloses a kind of multi-detector, this multi-detector can carry out the detection of harmful gas concentration and environment temperature, as carbon dioxide, sulfuretted hydrogen, temperature etc., avoided carrying multiple checkout equipment to the underground work personnel bring constant.And can send alerting signal.As: light, sound and vibration.
Application number is: the Chinese utility model patent of CN200620148809.X has been mentioned a kind of Detection of Air Quality instrument, this Detection of Air Quality instrument is except possessing the function that detects the down-hole harmful gas, can detect the air quality in the coal mine environment, provide the detection foundation for improving working environment.The advantage of its collection infrared sensor and electrochemical sensor has temperature sensor and pressure transducer, and gas detection kind can be expanded.
At present, the portable instrument range that can detect multiple harmful gas simultaneously is not high, have only part pure gas high concentration measuring instrument, need carry two or more professional high concentration gas test instruments in order to detect multiple high concentration harmful gas simultaneously, bring very big inconvenience to the operator; And existing apparatus for determination of gas all is subject to explosive-proof grade ExibI, can only use in lower 1 district and 2 districts of damp hazardous area hazard level in GB50058-92, can't use in 0 the highest district of hazard level, causing 0 district's gas concentration to detect becomes the blind area.
On the other hand, existing portable gas analyzer is to adopt storage battery power supply, because the operating voltage of accumulator all changes within the specific limits, in order to guarantee battery pack output constant voltage, usually all insert voltage stabilizer at the electric battery output terminal, traditional analyzer system adopts linear voltage regulator or adjusting and voltage-reduction switch stabilized voltage supply.These two kinds of power supplys all require cell voltage to be higher than the 3.3V that system adopts, and obviously require too harshness for the lithium battery of 3.7V, have reduced the power-on time of battery.In addition, common linear voltage regulator all requires input voltage specific output voltage to exceed more than 2v ~ 3V as the chip of 78xx series, and 3.7v changes 3.3v, and the pressure reduction of input and output has only 0.4v, does not obviously satisfy condition.Improved LDO low pressure difference linear voltage regulator only needs input voltage specific output voltage to exceed 200mV; the same with the adjusting and voltage-reduction switch stabilized voltage supply; can satisfy the driving arrangement requirement; but its voltage all requires to be higher than the 3.3v of system; 90 percent of the last discharge energy of battery does not use; greatly reduce the power-on time of battery; and LDO low pressure difference linear voltage regulator oneself power consumption is big; quick heating; need radiating condition good; easily protection and close output quits work equipment when using under hot conditions.
Yet, do not have integrated a plurality of high-range sensor in the existing apparatus for determination of gas (comprising CN:200920106184.4 and CN200620148809.X), can't use in 0 the highest district of colliery hazard level, also can't be applied to the detection of general concentration mine and high concentration gas mine simultaneously; Do not relate to technical matterss such as apparatus for determination of gas power protection, mu balanced circuit yet, can't be under the situation of battery electric quantity deficiency also can operate as normal; Gas demarcation mode is operated dangerous, analyzer carries out the gas timing signal at present, need put it in the container of a transparent sealing that is full of toxic gas, in the demarcation, need open the container of sealing, emit the risk that contacts toxic gas and leakage thereof, the button on the time-and-motion study device, carry out information interaction with analyzer, so very easily cause personnel's personal safety.
Summary of the invention
The objective of the invention is to solve that existing portable gas analyzer can not detect multiple high concentration harmful gas simultaneously, can't use in 0 high district of hazard level, the accumulator service efficiency of power supply is not high and analyzer easily endangers the series of technical such as deficiency of personal safety in demarcating.
In order to solve the problems of the technologies described above, the present invention at first provides a kind of portable high range multiparameter gas determinator that can detect multiple gases simultaneously, comprises that analyzer shell, sensing put device, battery, control circuit, hand-held remote controller; Described sensor device comprises infrared methane sensor, its resolution 0.1%, sensing range (0.0～100.0) %CH
4The infrared carbon dioxide sensor, its resolution 0.01%, sensing range (0.00 ~ 5.00) %CO
2The electrochemistry oxygen gas sensor, its resolution 0.1%, sensing range (0～25.0) %O
2The galvanochemistry carbon monoxide transducer, its resolution 1 * 10
-6, sensing range (0 ~ 10000) * 10
-6CO.
Particularly, eudiometry device provided by the invention comprises sensor device, cpu control circuit, warning device, battery, mu balanced circuit; It is characterized in that: the electric signal of described sensor device collection sends to cpu control circuit, and the electric signal of the described collection of cpu control circuit is handled, and triggers described warning device when result shows when having potential safety hazard; Described battery is connected with cpu control circuit, is used for the power supply to cpu control circuit; Described battery is connected with sensor device, is used for the power supply to sensor device; Described mu balanced circuit is between battery and sensor device.
Without limitation, described sensor device comprises infrared methane sensor, infrared carbon dioxide sensor, electrochemistry oxygen gas sensor, galvanochemistry carbon monoxide transducer, and described electric signal is represented gas concentration information.
Further, described eudiometry device also comprises a signal amplifier, an A/D change-over circuit, the electric signal of described sensor device collection is input to the A/D change-over circuit and carries out analog/digital conversion after signal amplification circuit amplifies, the digital signal after the conversion is input to cpu control circuit.
Further, cpu control circuit connects a warning device and/or display device, cpu control circuit is analyzed and is handled the data of detected expression gas concentration, when result shows when having potential safety hazard, cpu control circuit during with alerting signal, time of fire alarming and warning gas concentration value output to LCD and show.
Preferably, describedly show when having potential safety hazard when result, triggering described warning device comprises: when detected oxygen density value is lower than the certain lower limit value of setting, when perhaps one or more gas concentrations in methane, carbon dioxide, the carbon monoxide are higher than the higher limit of setting, cpu control circuit produces alerting signal, by warning circuit the indication of reporting to the police takes place.
The present invention also provides a kind of mu balanced circuit, comprises a power conversion chip, decoupling capacitor C1, capacitor C 2, capacitor C 5, resistance R 1, resistance R 2, resistance R 3, resistance R
T, inductance L 1 is characterized in that: described power conversion chip model is LTC3440; Anodal 7,8 pins that connect power conversion chip of power supply input, negative pole connects the 5th pin; Connect decoupling capacitor C1 between battery input positive pole and the negative pole; Connect inductance L 1 between 3,4 pins of power conversion chip LTC3440; 9 pins of power conversion chip connect resistance R 1, and resistance R 1 is connected to 6 pins of power conversion chip, and draws output end of pressure-stabilizing V
Out10 pins of power conversion chip connect capacitor C 5, and capacitor C 5 is connected to resistance R 3, and resistance R 3 is connected to 9 pins of power conversion chip; 9 pins of power conversion chip connect resistance R 2 over the ground; 1 pin of power conversion chip connects resistance R over the ground
TOutput end of pressure-stabilizing V
OutConnect capacitor C 2 over the ground; 5 pins of power conversion chip and battery 4 input minus earths.Described power supply is lithium battery, and the operating voltage of lithium battery is 3.7V, and lithium battery anode is connected to Vin+, and negative pole is connected to Vin-.
On the other hand, the present invention also provides a kind of gas caliberating device, comprises an infrared receiving circuit, and described infrared receiving circuit is infrared decoding chip U7 and infrared joint IR1, and the control chip of a cpu control circuit; It is characterized in that: infrared joint IR1 connects infrared decoding chip U7, and infrared decoding chip U7 connects the control chip of cpu control circuit; Described infrared decoding chip U7 model is BC7210A, and the control chip of cpu control circuit is PIC18LF6620.17 pin IRSW of the control chip of cpu control circuit connect a resistance R 16, the other end of resistance R 16 connects the base stage of triode Q4, the emitter of triode Q4 is connected to positive supply DVCC, the collector of triode Q4 is connected to 2,8 pins and the resistance R 20 of infrared decoding chip U7, the other end of resistance R 20 is connected to 2 pins of infrared joint IR1 and the positive pole of capacitor C 21, the 3 pin ground connection of the negative pole of capacitor C 21 and infrared joint IR1; 1 pin of infrared decoding chip U7 connects 27 pin ACT of the control chip of cpu control circuit.The switch control chip that also comprises a cpu control circuit, its model are TS5A3160; 6 pins of infrared decoding chip U7 connect 1 pin IRCODE of the switch control chip of cpu control circuit; 7 pins of infrared decoding chip U7 are connected to 1 pin of infrared joint IR1; The 4 pin ground connection of infrared decoding chip U7.
The beneficial effect of patent of the present invention is: provide a good solution and instrument for detecting multiple high concentration gas simultaneously, reduced inconvenience and trouble that the operator carries a plurality of equipment; Provide a kind of and can detect the safer apparatus for determination of gas that uses in 0 the highest district of hazard level, stopped gas concentration and detected the blind area; Improved single-unit lithium battery power supply service efficiency, make cell voltage to provide power supply power for analyzer at any state that is higher than, is less than or equal to output voltage, and conversion efficiency is up to 96%, even during near discharge off, still can guarantee to export burning voltage at accumulator; This device meets the requirement of explosion proof of national standard ExiaI grade, is applicable to the 0 the highest district of hazard level, damp hazardous area among the GB50058-92, does not light even can not cause under the most abominable situation; Infrared remote control is demarcated the process that analyzer is demarcated does not need to open the airtight container that is full of toxic gas, has effectively avoided the contact toxic gas and has prevented it to leak, and has avoided toxic gas to leak the personnel that cause and has endangered.
Description of drawings
Below in conjunction with drawings and Examples patent of the present invention is further specified.
Fig. 1 is Patent equipment schematic appearance of the present invention.
Fig. 2 is Patent equipment principle of work block diagram of the present invention.
Fig. 3 is Patent equipment mu balanced circuit fundamental diagram of the present invention.
Fig. 4 is Patent equipment infrared receiving circuit fundamental diagram of the present invention.
Embodiment
In first embodiment of the present invention, a kind of eudiometry device is provided, comprise that analyzer shell, sensing put device, battery, control circuit, hand-held remote controller.Fig. 1 is eudiometry device appearance synoptic diagram, has display window 1 on the shell, in comprise infrared receiving circuit, and button 2.
Fig. 2 is the structured flowchart of eudiometry device, realizes that as basic functions described device can only comprise sensor device, cpu control circuit, battery, warning device.
Preferably, described sensor device comprises infrared methane sensor, infrared carbon dioxide sensor, electrochemistry oxygen gas sensor, galvanochemistry carbon monoxide transducer, can detect in four kinds of gases such as methane, carbon dioxide, oxygen, carbon monoxide one or more simultaneously, especially, can detect high concentration gas.Described infrared methane sensor, its resolution 0.1%, sensing range (0.0～100.0) %CH
4The infrared carbon dioxide sensor, its resolution 0.01%, sensing range (0.00 ~ 5.00) %CO
2The electrochemistry oxygen gas sensor, its resolution 0.1%, sensing range (0～25.0) %O
2The galvanochemistry carbon monoxide transducer, its resolution 1 * 10
-6, sensing range (0 ~ 10000) * 10
-6CO; Described infrared methane sensor model is MSHia-P/CH
4/ 5/V/P, the model of described infrared carbon dioxide sensor is MSHia-P/CO
2/ 5/V/P sensor; The model of described electrochemistry oxygen gas sensor is O
2-A2, the model of described galvanochemistry carbon monoxide transducer is CO-AE.
More preferably, described eudiometry device also comprises a signal amplifier, and this signal amplifier is connected with sensor device.The electric signal that described sensor device is gathered, described electric signal is represented gas concentration information, the electric signal that collects is input to a signal amplifier, is input to an A/D change-over circuit and carries out analog/digital conversion arrival cpu control circuit after signal amplification circuit amplifies.Particularly, the electric signal of four kinds of gas sensor generations amplifies through signal amplification circuit, after the A/D change-over circuit data-switching, reaches cpu control circuit.
Described eudiometry device also comprises serial ports selection circuit, and described serial ports selects circuit to connect RS232 communication interface, infrared decoding chip respectively; It is a numerical control analog switch that described serial ports is selected circuit.Described numerical control analog switch be such work: when apparatus for determination of gas need connect external device (as: sniffing robot, computing machine etc.), the numerical control analog switch was connected with the RS232 communication interface.
When apparatus for determination of gas entered the demarcation state, serial ports was selected the numerical control analog switch is connected with infrared decoding chip.
Cpu control circuit connects a warning device and/or display device.Cpu control circuit is analyzed and is handled the data of detected expression gas concentration, the gas concentration value of correspondence is outputed to display device (for example LCD) show.When detected oxygen density value is lower than the certain lower limit value of the necessary lower limit of human survival or setting, when perhaps one or more gas concentrations in methane, carbon dioxide, the carbon monoxide are higher than the higher limit of setting, cpu control circuit produces alerting signal, by warning circuit the indication of reporting to the police takes place, gas concentration value outputed to the LCD demonstration when cpu control circuit was with alerting signal, time of fire alarming and warning simultaneously.
Without limitation, described eudiometry device also comprises an input media, and it is connected to cpu control circuit.This input media can be keyboard, touch pad, voice-input device etc., only shows the embodiment of keyboard among Fig. 1, and cpu control circuit receives the input signal of input media.
It will be understood by those of skill in the art that the present invention allows to set high alarming value according to detecting needs, LCD shows the gas high concentration value in real time.
Eudiometry device provided by the invention also comprises a battery, and described battery is connected with cpu control circuit, is used for the power supply to cpu control circuit; Described battery also is connected with sensor device, is used for the power supply to sensor device.More preferably, comprise a mu balanced circuit between described battery and the sensor device.Described battery can connect a charging circuit, carries out AC charging by this charging circuit.
In second embodiment of the present invention, a kind of mu balanced circuit is provided, this mu balanced circuit is preferably used in the described eudiometry device, is used for the input voltage of sensor device is carried out voltage stabilizing.
Fig. 3 has described device mu balanced circuit principle of work.Described mu balanced circuit comprises a power conversion chip, and described power conversion chip can adopt HX8001, sc8001, ZCC344, LTC3440 etc.The most preferably, the inventor screens power conversion chip through test of many times, analyzes and finds to adopt the LTC3440 chip output current can reach 600mA when 3V; All possess continuous conveying function in step-down with under boosting, when cell voltage was higher than 3.3V, LTC3440 started decompression mode; Be lower than 3.3V and might continue to drop to 2.7V the time, LTC3440 compares with other buck converters just with boost mode work when cell voltage drops to, use LTC3440 battery can be prolonged serviceable life and reach 30%, be best suited for the eudiometry device.
In described mu balanced circuit, anodal 7,8 pins that connect power conversion chip (LTC3440) of battery input, negative pole connects the 5th pin; Connect decoupling capacitor (C1) between battery input positive pole and the negative pole; Connect inductance (L1) between 3,4 pins of power conversion chip (LTC3440); 9 pins of power conversion chip (LTC3440) connect resistance (R1), and resistance (R1) is connected to 6 pins of power conversion chip (LTC3440), and draws output end of pressure-stabilizing (V
Out); 10 pins of power conversion chip (LTC3440) connect electric capacity (C5), and electric capacity (C5) is connected to resistance (R3), and resistance (R3) is connected to 9 pins of power conversion chip (LTC3440); 9 pins of power conversion chip (LTC3440) connect resistance (R2) over the ground; 1 pin of power conversion chip (LTC3440) connects resistance (R over the ground
T); Output end of pressure-stabilizing (V
Out) connect electric capacity (C2) over the ground; 5 pins of power conversion chip (LTC3440) and battery (4) input minus earth.By this mu balanced circuit, the power supply lithium battery is realized the stable output conversion of voltage, reaches high-level efficiency and uses.
Preferably, the operating voltage of described power supply lithium battery is 3.7V, lithium battery anode is connected to Vin+, negative pole is connected to Vin-, by mu balanced circuit voltage transitions shown in Figure 3, Vout output voltage 3.3V, no matter lithium battery voltage is higher than, is equal to or less than 3.3V, and the Vout end has burning voltage 3.3V output.
In the 3rd embodiment of the present invention, provide a kind of gas caliberating device, described gas caliberating device adopts infrared remote-control operation.The gas caliberating device comprises hand-held remote controller.
As shown in Figure 4, Fig. 4 has described apparatus of the present invention infrared receiving circuit fundamental diagram, described gas caliberating device further comprises an infrared receiving circuit, and described infrared receiving circuit comprises infrared decoding chip U7 and infrared joint IR1, and the control chip of a cpu control circuit.Preferably, described infrared decoding chip model is BC7210A, and the control chip of cpu control circuit is preferably PIC18LF6620.The 17 pin IRSW of PIC18LF6620 connect a resistance (R16), the other end of resistance (R16) connects the base stage of triode (Q4), the emitter of triode (Q4) is connected to positive supply (DVCC), the collector of triode (Q4) is connected to 2,8 pins and the resistance (R20) of infrared decoding chip (U7), the other end of resistance (R20) is connected to 2 pins of infrared joint (IR1) and the positive pole of electric capacity (C21), 3 pin ground connection of the negative pole of electric capacity (C21) and infrared joint (IR1); 1 pin of infrared decoding chip (U7) connects 27 pin ACT of the control chip (PIC18LF6620) of cpu control circuit; 6 pins of infrared decoding chip (U7) connect 1 pin IRCODE of the numerical control analog switch of cpu control circuit; 7 pins of infrared decoding chip (U7) are connected to 1 pin of infrared joint (IR1); 4 pin ground connection of infrared decoding chip (U7).
As shown in Figure 1 and Figure 4, can trigger the work of gas caliberating device by one or one group of input signal.This device gas timing signal for example, at first long by on this device ▲ combination in any of one or three button in three buttons of ▼ ■, 17 pin IRSW of the control chip of cpu control circuit (PIC18LF6620) send control signal, carrying out serial ports selects, start infrared decoding chip (U7) and infrared joint (IR1), enter the gas calibration mode, then this device is put into airtight container, next set gas concentration by one or one group of input signal, for example operate Infrared remote controller ▲ ▼ button, set gas concentration, press OK and determine.Hand-held remote controller sends to data the infrared joint (IR1) of infrared receiving circuit through the infrared radio mode, infrared joint (IR1) receives the data that telepilot is sent, it is sent into infrared decoding chip (U7) decoding handles, 6 pins of infrared decoding chip (U7) send decoded data to cpu control circuit, pass to the control chip (PIC18LF6620) of cpu control circuit after infrared decoding chip (U7) deal with data again through the internal circuit board circuit, information is presented on the LCD, and stores the data in the EEPROM; The finish control chip (PIC18LF6620) of cpu control circuit of demarcation is read the parameter of demarcating in the storer in EEPROM, feeding corresponding gas begins to demarcate, after the demonstration of LCD data is stable, can presses OK by Infrared remote controller and determine to finish to demarcate, the demarcation of analyzer gas finishes.The finish control chip (PIC18LF6620) of cpu control circuit of demarcation is read the parameter of demarcating in the storer in EEPROM, carry out calculating and the detection of gas concentration, replace traditional method that airtight container direct control analyzer is demarcated control of opening.
The beneficial effect of patent of the present invention is: provide a good solution and instrument for detecting multiple high concentration gas simultaneously, reduced inconvenience and trouble that the operator carries a plurality of equipment; Provide a kind of and can detect the safer apparatus for determination of gas that uses in 0 the highest district of hazard level, stopped gas concentration and detected the blind area; Improved single-unit lithium battery power supply service efficiency, make cell voltage to provide power supply power for analyzer at any state that is higher than, is less than or equal to output voltage, and conversion efficiency is up to 96%, even during near discharge off, still can guarantee to export burning voltage at accumulator; This device meets the requirement of explosion proof of national standard ExiaI grade, is applicable to the 0 the highest district of hazard level, damp hazardous area among the GB50058-92, does not light even can not cause under the most abominable situation; Infrared remote control is demarcated the process that analyzer is demarcated does not need to open the airtight container that is full of toxic gas, has effectively avoided the contact toxic gas and has prevented it to leak, and has avoided toxic gas to leak the personnel that cause and has endangered.
Claims (10)
1. an eudiometry device comprises sensor device, cpu control circuit, warning device, battery, mu balanced circuit; It is characterized in that: the electric signal of described sensor device collection sends to cpu control circuit, and the electric signal of the described collection of cpu control circuit is handled, and triggers described warning device when result shows when having potential safety hazard; Described battery is connected with cpu control circuit, is used for the power supply to cpu control circuit; Described battery is connected with sensor device, is used for the power supply to sensor device; Described mu balanced circuit is between battery and sensor device.
2. eudiometry device as claimed in claim 1, it is characterized in that: described sensor device comprises infrared methane sensor, infrared carbon dioxide sensor, electrochemistry oxygen gas sensor, galvanochemistry carbon monoxide transducer, and described electric signal is represented gas concentration information.
3. eudiometry device as claimed in claim 1 or 2, it is characterized in that: described eudiometry device also comprises a signal amplifier, an A/D change-over circuit, the electric signal of described sensor device collection is input to the A/D change-over circuit and carries out analog/digital conversion after signal amplification circuit amplifies, the digital signal after the conversion is input to cpu control circuit.
4. eudiometry device as claimed in claim 1 is characterized in that: comprise that also a serial ports selects circuit, described serial ports selects circuit to connect RS232 communication interface, infrared decoding chip respectively; It is a numerical control analog switch that described serial ports is selected circuit.
5. eudiometry device as claimed in claim 1, it is characterized in that: cpu control circuit connects a warning device and/or display device, cpu control circuit is analyzed and is handled the data of detected expression gas concentration, when result shows when having potential safety hazard, cpu control circuit during with alerting signal, time of fire alarming and warning gas concentration value output to LCD and show.
6. eudiometry device as claimed in claim 1, it is characterized in that: describedly show when having potential safety hazard when result, triggering described warning device comprises: when detected oxygen density value is lower than the certain lower limit value of setting, when perhaps one or more gas concentrations in methane, carbon dioxide, the carbon monoxide are higher than the higher limit of setting, cpu control circuit produces alerting signal, by warning circuit the indication of reporting to the police takes place.
7. a mu balanced circuit that is used for the described apparatus for determination of gas of claim 1 comprises a power conversion chip, decoupling capacitor C1, capacitor C 2, capacitor C 5, resistance R 1, resistance R 2, resistance R 3, resistance R
T, inductance L 1 is characterized in that: described power conversion chip model is LTC3440; Anodal 7,8 pins that connect power conversion chip of power supply input, negative pole connects the 5th pin; Connect decoupling capacitor C1 between battery input positive pole and the negative pole; Connect inductance L 1 between 3,4 pins of power conversion chip LTC3440; 9 pins of power conversion chip connect resistance R 1, and resistance R 1 is connected to 6 pins of power conversion chip, and draws output end of pressure-stabilizing V
Out10 pins of power conversion chip connect capacitor C 5, and capacitor C 5 is connected to resistance R 3, and resistance R 3 is connected to 9 pins of power conversion chip; 9 pins of power conversion chip connect resistance R 2 over the ground; 1 pin of power conversion chip connects resistance R over the ground
TOutput end of pressure-stabilizing V
OutConnect capacitor C 2 over the ground; 5 pins of power conversion chip and battery 4 input minus earths.
8. mu balanced circuit as claimed in claim 7, it is characterized in that: described power supply is lithium battery, and the operating voltage of lithium battery is 3.7V, and lithium battery anode is connected to Vin+, and negative pole is connected to Vin-.
9. a gas caliberating device that is used for the described apparatus for determination of gas of claim 1 comprises an infrared receiving circuit, and described infrared receiving circuit comprises infrared decoding chip U7 and infrared joint IR1, and the control chip of a cpu control circuit; It is characterized in that: infrared joint IR1 connects infrared decoding chip U7, and infrared decoding chip U7 connects the control chip of cpu control circuit; Described infrared decoding chip U7 model is BC7210A, and the control chip of cpu control circuit is PIC18LF6620.
10. gas caliberating device as claimed in claim 9, it is characterized in that: 17 pin IRSW of the control chip of cpu control circuit connect a resistance R 16, the other end of resistance R 16 connects the base stage of triode Q4, the emitter of triode Q4 is connected to positive supply DVCC, the collector of triode Q4 is connected to 2,8 pins and the resistance R 20 of infrared decoding chip U7, the other end of resistance R 20 is connected to 2 pins of infrared joint IR1 and the positive pole of capacitor C 21, the 3 pin ground connection of the negative pole of capacitor C 21 and infrared joint IR1; 1 pin of infrared decoding chip U7 connects 27 pin ACT of the control chip of cpu control circuit; 6 pins of described infrared decoding chip U7 connect 1 pin IRCODE of the numerical control analog switch of cpu control circuit; 7 pins of infrared decoding chip U7 are connected to 1 pin of infrared joint IR1; The 4 pin ground connection of infrared decoding chip U7.
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| CN103884477A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Handheld type laser methane gas baffle board leakage detecting device |
| CN104090072A (en) * | 2014-07-03 | 2014-10-08 | 中国人民解放军后勤工程学院 | Calibration device of oil gas concentration detector |
| CN105651936A (en) * | 2014-11-12 | 2016-06-08 | 长沙理工大学 | Gas sensor comprehensive tester and measurement method thereof |
| CN105717173A (en) * | 2016-03-30 | 2016-06-29 | 济南本安科技发展有限公司 | Two-wire toxic gas detector with digital display function |
| CN105738573A (en) * | 2016-02-27 | 2016-07-06 | 乐清市启铭电气有限公司 | Portable gas alarming device and debugging method |
| CN105973830A (en) * | 2016-04-29 | 2016-09-28 | 重庆工商职业学院 | Portable infrared methane sensor |
| CN109387604A (en) * | 2018-09-08 | 2019-02-26 | 上海源安安全科技有限公司 | A kind of gas sensor remote monitoring method and its system |
| CN110118861A (en) * | 2019-05-28 | 2019-08-13 | 安徽延达智能科技有限公司 | A kind of dual sensor hazardous gas of robot compares, school check system |
| CN110308105A (en) * | 2019-04-24 | 2019-10-08 | 中国矿业大学 | Non-dispersive infrared methane sensor verification system based on cloud platform |
| CN113834858A (en) * | 2021-09-11 | 2021-12-24 | 深圳市海曼科技股份有限公司 | Hazardous gas detection circuit and hazardous gas detection method |
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| CN103884477A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Handheld type laser methane gas baffle board leakage detecting device |
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| CN104090072B (en) * | 2014-07-03 | 2016-04-20 | 中国人民解放军后勤工程学院 | A kind of gas concentration detector caliberating device |
| CN105651936A (en) * | 2014-11-12 | 2016-06-08 | 长沙理工大学 | Gas sensor comprehensive tester and measurement method thereof |
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| CN105717173A (en) * | 2016-03-30 | 2016-06-29 | 济南本安科技发展有限公司 | Two-wire toxic gas detector with digital display function |
| CN105973830A (en) * | 2016-04-29 | 2016-09-28 | 重庆工商职业学院 | Portable infrared methane sensor |
| CN109387604A (en) * | 2018-09-08 | 2019-02-26 | 上海源安安全科技有限公司 | A kind of gas sensor remote monitoring method and its system |
| CN110308105A (en) * | 2019-04-24 | 2019-10-08 | 中国矿业大学 | Non-dispersive infrared methane sensor verification system based on cloud platform |
| CN110118861A (en) * | 2019-05-28 | 2019-08-13 | 安徽延达智能科技有限公司 | A kind of dual sensor hazardous gas of robot compares, school check system |
| CN113834858A (en) * | 2021-09-11 | 2021-12-24 | 深圳市海曼科技股份有限公司 | Hazardous gas detection circuit and hazardous gas detection method |
| CN113834858B (en) * | 2021-09-11 | 2023-09-29 | 深圳市海曼科技股份有限公司 | Dangerous gas detection circuit and dangerous gas detection method |
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