CN109633095A - Portable gas detector circuit - Google Patents
Portable gas detector circuit Download PDFInfo
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- CN109633095A CN109633095A CN201811643782.5A CN201811643782A CN109633095A CN 109633095 A CN109633095 A CN 109633095A CN 201811643782 A CN201811643782 A CN 201811643782A CN 109633095 A CN109633095 A CN 109633095A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
A kind of portable gas detector circuit, comprising: control module；For exporting the battery power switch module that cell voltage is circuit devcie power supply when cell voltage reaches preset value；For obtaining the ambient temperature data of temperature sensor and exporting to the temperature detecting module of control module；For obtaining the signal of gas analysis sensor and exporting to the processing module of control module；Control module is configured to, and is calculated according to ambient temperature data and gas analysis sensor signal and is obtained gas concentration value and export to display device.The present invention controls the output of cell voltage by battery power switch module, when detecting that cell voltage reaches preset value, just exports cell voltage, does not otherwise export, to prevent too low voltage from causing circuit devcie fluctuation of service；In addition, obtaining simultaneously processing environment temperature data and gas analysis sensor data by temperature detecting module and processing module, then calculated by control module module and obtain gas concentration value, measurement result is more acurrate.
Description
Technical field
The present invention relates to a kind of gas concentration detector circuit more particularly to a kind of portable gas detector circuits.
Background technique
A kind of pesticide of fumigant generated steam poisoning harmful organism when being using volatilization, is entered with gaseous molecular
Toxic action is played in harmful organism body, is had different from forms such as the liquid, solid or compressed gas of gasification.Fumigant is usually used
Bromomethane and vikane.Dosage calculates that (unit is grams m according to stifling site space volume3), concentration according to it is stifling when
Between, stifling place tightness, the amount for being fumigated object and adsorption capacity of fumigant steam etc. is determined.Preferably warehouse, tent,
House, compartment, cabin etc. can it is closed or be bordering on it is closed under conditions of apply, can in the case where being fumigated object and largely concentrating
Effectively to eliminate hidden pest or germ.But remaining fumigant is dispersed into air, it will is generated to human health
Serious harm.Therefore, it is necessary to the concentration of fumigant in periodic detection air.
Existing detection method, which typically first samples, to be sent to laboratory afterwards and goes to detect, the time spent in it is long.In addition,
It tests that indoor detecting instrument is all relatively large, the place that need to be detected can not be taken to.Therefore, occurs portable gas on the market
Body detector, uses battery to power, but since its voltage can be reduced constantly battery in use, influences in detector
Chip operation, causes system unstable, cannot support the portable performance of detector well；In addition, existing portable gas
The circuit setting of detector is unreasonable, cannot correct gas concentration value, measurement result inaccuracy depending on changes in ambient temperature.
Summary of the invention
It is an object of the present invention to provide a kind of portable gas detector circuits, to solve the above problems.
According to an aspect of the invention, there is provided a kind of portable gas detector circuit, comprising:
Control module；
It is connect with battery, for exporting the battery that cell voltage is circuit devcie power supply when cell voltage reaches preset value
Power switch module；
For obtaining the ambient temperature data of temperature sensor and exporting to the temperature detecting module of control module；
For obtaining the signal of gas analysis sensor and exporting to the processing module of control module；
Control module is configured to, and is calculated according to ambient temperature data and gas analysis sensor signal and is obtained gas concentration value
And it exports to display device.
Portable gas detector circuit of the invention controls the output of cell voltage by battery power switch module, when
When detecting that cell voltage reaches preset value, cell voltage is just exported, is not otherwise exported, to prevent too low voltage from causing circuit
Device fluctuation of service；In addition, obtaining simultaneously processing environment temperature data and gas point by temperature detecting module and processing module
Sensing data is analysed, then is calculated by control module module and obtains gas concentration value, measurement result is more acurrate.
In some embodiments, further includes:
It is connect with battery, for detecting cell voltage and exporting to the battery detection module of control module；
The deficient electric indicating module for owing electricity instruction is issued according to the deficient electric signal of control module；
Control module is configured to, and judges whether battery capacity is sufficient according to the battery voltage signal of battery detection module, if
It is no, it exports and owes electric signal to deficient electric indicating module.
The state of charge for knowing battery by owing electricity instruction as a result, reminds user to replace battery or charge the battery.
In some embodiments, battery is rechargeable battery, is connect with charger；
It further include the charge control module for being disconnected battery and charger according to the power down control signal of control module；
Control module is configured to, and judges whether battery is full of according to the battery voltage signal of battery detection module, if so, defeated
Power down control signal is to charge control module out.
Battery is protected by way of full of power-off as a result, extends the service life of battery.
In some embodiments, gas analysis sensor includes analog quantity gas analysis sensor and digital quantity gas point
Analyse sensor；
Processing module includes:
It obtains the signal of analog quantity gas analysis sensor and exports after carrying out analog-to-digital conversion to it to the mould of control module
Number conversion module；
It obtains the signal of digital quantity gas analysis sensor and exports after carrying out level conversion to it to the electricity of control module
Flat communication module.
Thereby, it is possible to the multiple gases analyte sensors that wildcard is applicable in analog quantity and digital quantity.
In some embodiments, further includes:
The threeway of purge path is switched to by detection path according to the threeway valve control signal of control module, control triple valve
Valve control module；
Control module is configured to, according to the purge signal that input unit inputs, output threeway valve control signal to triple valve
Control module.
Thereby, it is possible to be rapidly switched to purge path to carry out air purging.
In some embodiments, control module is configured to, and real-time ambient temperature data is exported to display device, and
It is calculated according to the ambient temperature data of the correction of input unit input and gas analysis sensor signal and obtains gas concentration value simultaneously
It exports to display device.
It allows users to be corrected according to real-time ambient temperature data as a result, keeps testing result more acurrate, stable.
In some embodiments, further includes: connect with battery power switch module, to cell voltage carry out decompression and it is defeated
Step-down voltage is the voltage reduction module of circuit devcie power supply out.
Thereby, it is possible to provide power supply for the various chips of different power reguirements.
In some embodiments, further includes:
The police instruction module of police instruction is issued according to the alarm signal of control module；
Control module is configured to, and will be calculated the gas concentration value obtained and is compared with preset value, if gas concentration value is than pre-
If value is big, then alarm signal is exported to police instruction module.
Thereby, it is possible to prompt in concentration over-standard user.
In some embodiments, further includes:
For detecting supply voltage, when supply voltage is lower than preset value the power down of output reset signal to control module it is multiple
Position module；
For providing the clock module of temporal information for control module；
For providing the memory module of data storage for control module.
Thereby, it is possible to guarantee the stable operation of system, store and transfer convenient for recording time information, convenient for data.
In some embodiments, further includes:
The first communication module for being communicated with input device and display device；
For with peripheral device communication with the second communication module of output data.
As a result, convenient for the operational order of input user and the display and output of data.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of portable gas detector of the invention；
Fig. 2 is the circuit diagram of battery power switch module of the invention；
Fig. 3 is the circuit diagram of battery detection module of the invention；
Fig. 4 is the circuit diagram of the first voltage reduction module of the invention；
Fig. 5 is the circuit diagram of the second voltage reduction module of the invention；
Fig. 6 is the circuit diagram of third voltage reduction module of the invention；
Fig. 7 is the circuit diagram of the 4th voltage reduction module of the invention；
Fig. 8 is the circuit diagram of the 5th voltage reduction module of the invention；
Fig. 9 is the circuit diagram of charge control module of the invention；
Figure 10 is the circuit diagram of triple valve control module of the invention；
Figure 11 is the circuit diagram of detection indicating module of the invention；
Figure 12 is the circuit diagram of police instruction module of the invention；
Figure 13 is the circuit diagram of temperature detecting module of the invention；
Figure 14 is the circuit diagram of analog-to-digital conversion module of the invention；
Figure 15 is the circuit diagram of filter module of the invention；
Figure 16 is the circuit diagram of level communication module of the invention；
Figure 17 is the circuit diagram of power-off reset module of the invention；
Figure 18 is the circuit diagram of clock module of the invention；
Figure 19 is the circuit diagram of the first crystal oscillator module of the invention；
Figure 20 is the circuit diagram of memory module of the invention；
Figure 21 is the circuit diagram of the first communication module of the invention；
Figure 22 is the circuit diagram of the second communication module of the invention；
Figure 23 is the circuit diagram of deficient electric indicating module of the invention；
Figure 24 is the circuit diagram of failure indication module of the invention；
Figure 25 is the circuit diagram of control module of the invention；
Figure 26 is the circuit diagram of the second crystal oscillator module of the invention.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Portable gas detector (hereinafter referred to as detector) of the invention includes cabinet and is arranged on cabinet
Pcb board, charger, battery, gas passage (including detection path and purge path), the triple valve for switching gas passage,
Indicator light, temperature sensor, gas analysis sensor, input unit, display device and sampling pump.The pcb board is equipped with portable
Formula gas detecting instrument circuit 100.The indicator light includes detection indicator light, alarm lamp, owes electric indicator light and malfunction indicator lamp.
In the present embodiment, the touch display screen which is specifically integrated in other embodiments can also be with
Using seperated input device and display device, such as key-press input etc..
Fig. 1 schematically shows a kind of circuit theory of the portable gas detector of embodiment according to the present invention
Block diagram.The portable gas detector circuit 100 includes battery power switch module, battery detection module, voltage reduction module, charging
Control module, triple valve control module, detection indicating module, police instruction module, temperature detecting module, analog-to-digital conversion module,
Filter module, level communication module, power-off reset module, clock module, the first crystal oscillator module, memory module, the first communication
Module, the second communication module owe electric indicating module, failure indication module, control module and the second crystal oscillator module.
As shown in Fig. 2, the battery power switch module is used to detect cell voltage, and when cell voltage reaches preset value
Output cell voltage to voltage reduction module and other circuit modules is powered.Specifically, which includes
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 8th resistance R8, the tenth resistance R10, the 25th electricity
Hinder R25, first capacitor C1, the first triode Q1, metal-oxide-semiconductor field effect transistor Q10 and the first chip U1.The first chip U1 is with electricity
The chip for pressing detection function, the output with the first triode Q1 and metal-oxide-semiconductor field effect transistor Q10 control cell voltage, works as detection
When reaching preset value to cell voltage, then cell voltage is exported, is not otherwise exported, to prevent too low voltage from causing circuit devcie
Fluctuation of service.
Wherein, the first end of 3rd resistor R3 is connect with cell voltage BAT_POWER, second end and the first chip U1
Pin 3 connect.The both ends of 4th resistance R4 are connect with the both ends of first capacitor C1 respectively, first capacitor C1 anode with
The pin 3 of first chip U1 connects, cathode ground connection.The first end of 8th resistance R8 is connect with the pin 3 of the first chip U1,
Its second end is connect with the pin 1 of the first chip U1, and the pin 2 of the first chip U1 is grounded.The first end of tenth resistance R10 with
The pin 1 of first chip U1 connects, and second end is connect with the base stage of the first triode Q1.The of 25th resistance R25
One end is connect with the base stage of the first triode Q1, second end ground connection.The emitter of first triode Q1 is grounded, collector
It is connect respectively with the first end of first resistor R1, second resistance R2, the second end of first resistor R1 is with metal-oxide-semiconductor field effect transistor Q10's
Grid connection, the second end of second resistance R2 are connect with the source electrode of metal-oxide-semiconductor field effect transistor Q10.The source electrode of metal-oxide-semiconductor field effect transistor Q10 with
Cell voltage BAT_POWER connection, drain electrode output cell voltage BAT_ON.Cell voltage BAT_ON is exported as VDD_BAT
It powers to voltage reduction module and other circuit modules for it.
As shown in figure 3, the battery detection module is for detecting cell voltage and exporting to control module comprising the 5th electricity
Hinder R5, the 6th resistance R6, the 7th resistance R7, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 4th capacitor C4 and the 9th
Diode D9.Wherein, battery BAT is connect with the anode of charging voltage 17V-CLOSE and the 9th diode D9 respectively, and the 9th
The cathode of diode D9 respectively with the first end of cell voltage BAT_POWER, the first end of the 5th resistance R5, third capacitor C3 with
And second capacitor C2 anode connection.The second end of 5th resistance connects with the first end of the 6th resistance R6, the 7th resistance R7 respectively
It connects.The second end of 7th resistance R7 by the battery voltage signal of the port BAT_ADC output detection to control module, and with the 4th
The first end of capacitor C4 connects.The second end of third capacitor C3, the cathode of the second capacitor C2, the 6th resistance R6 second end and
The second end of 4th capacitor C4 is grounded.
As shown in Figure 4-8, which connect with battery power switch module, by decompression chip to cell voltage
VDD_BAT be depressured and output buck voltage is the circuit devcie power supply of other circuit modules.Voltage reduction module includes and battery
VDD_BAT is simultaneously depressurized to the first voltage reduction module of 8V, VDD_BAT is depressurized to the third drop of 12V by the connection of power switch module
Die block, and connect with the first voltage reduction module and by the 4th voltage reduction module of 8V voltage step-down to 5V, by 8V voltage step-down extremely
The 5th voltage reduction module of 6V, and connect with the 4th voltage reduction module and by the second voltage reduction module of 5V voltage step-down to 3.6V,
In power supply indicator LED1 and LED2 are equipped in the second voltage reduction module, instruction when connecting as power supply connection.
As shown in figure 9, the charge control module is used for battery and charger according to the power down control signal of control module
It disconnects.Specifically, charge control module includes eleventh resistor R11, the 26th resistance R26, the second triode Q2, the three or two
Pole pipe D3 and third relay K3.Eleventh resistor R11, the 26th resistance R26, the second triode Q2, third diode
D3 forms the switching circuit of triode control, after the power down control signal for receiving control module transmission, third relay K3
Movement disconnects charger and battery, stops charging.
Wherein, the first end of eleventh resistor R11 is connect by port PO WER_PIN with control module, second end
It is connect respectively with the base stage of the first end of the 26th resistance R26, the second triode Q2, the second end of the 26th resistance R26
It is grounded with the emitting stage of the second triode Q2.The collector of second triode Q2 is connect with the first end of third diode D3, the
The second end of three diode D3 is connect with VDD_BAT.Third relay K3 is in parallel with third diode D3.The end third relay K3
Mouth 1 connects 17V-CLOSE, and port 2 connects 17VPOWER, and port 3 is sky.
As shown in Figure 10, which is used for the threeway valve control signal according to control module, control threeway
Valve switches to purge path by detection path.Sample inlet is connected to by the detection path with gas outlet, is used for sample detection, this is clear
It washes access and is connected to air intlet with gas outlet, for carrying out purging cleaning to access using air.Specifically, triple valve controls
Module includes twelfth resistor R12, the 27th resistance R27, third transistor Q3, the 4th diode D4 and the 4th relay
K4.Twelfth resistor R12, the 27th resistance R27, third transistor Q3, the 4th diode D4 form triode control
Switching circuit, receive control module transmission threeway valve control signal after, the 4th relay K4 movement, make triple valve by examining
It surveys access and switches to purge path, to carry out air purging cleaning.
Wherein, the first end of twelfth resistor R12 is connect by port SOLENOID_PIN with control module, and second
End is connect with the first end of the 27th resistance R27, the base stage of third transistor Q3 respectively, and the second of the 27th resistance R27
End and the emitting stage of third transistor Q3 are grounded.The collector of third transistor Q3 is connect with the first end of the 4th diode D4,
The second end of 4th diode D4 is connect with VDD_BAT.4th relay K4 is in parallel with the 4th diode D4.4th relay K4
Port 1 is sky, and port 2 connects 12V voltage, and port 3 connects triple valve.
As shown in figure 11, which is used for the detection indication signal according to control module, control detection instruction
Lamp energization lights.Specifically, detection indicating module include thirteenth resistor R13, the 28th resistance R28, the 4th triode Q4,
First diode D1, the first relay K1 and the 29th resistance R29.Thirteenth resistor R13, the 28th resistance R28, the 4th
Triode Q4, first diode D1 form the switching circuit of triode control, receive the detection instruction of control module transmission
After signal, the first relay K1 is connected and is acted, and lights detection indicator light MEASURE_LED energization.
Wherein, the first end of thirteenth resistor R13 is connect by port LEDA_PIN with control module, second end point
Do not connect with the first end of the 28th resistance R28, the base stage of the 4th triode Q4, the second end of the 28th resistance R28 with
The emitting stage of 4th triode Q4 is grounded.The collector of 4th triode Q4 is connect with the first end of first diode D1, and first
The second end of diode D1 is connect with VDD_BAT.First relay K1 is in parallel with first diode D1.First port relay K1
1 is sky, and port 2 connects voltage VDD_BAT, and port 3 passes through the 29th resistance R29 and detection indicator light MEASURE_
LED connection.
As shown in figure 12, which is used to issue police instruction according to the alarm signal of control module.Specifically
Ground, the police instruction realize that police instruction module includes the 40th resistance R40, the 43rd resistance by alarm lamp
R43, the 11st triode Q11, the second diode D2, the second relay K2 and the 30th resistance R30.40th resistance R40,
43 resistance R43, the 11st triode Q11, the second diode D2 form the switching circuit of triode control, receive control
After the alarm signal that molding block is sent, the second relay K2 movement lights alarm lamp ALARM energization.
Wherein, the first end of the 40th resistance R40 is connect by port LEDA_PIN with control module, second end point
It is not connect with the first end of the 43rd resistance R43, the base stage of the 11st triode Q11, the second end of the 43rd resistance R43
It is grounded with the emitting stage of the 11st triode Q11.The first end of the collector of 11st triode Q11 and the second diode D2 connect
It connects, the second end of the second diode D2 is connect with VDD_BAT.Second relay K2 is in parallel with the second diode D2.Second relay
The port device K2 1 is sky, and port 2 connects voltage VDD_BAT, and port 3 passes through the 30th resistance R30 and alarm lamp
ALARM connection.
As shown in figure 13, which is used to obtain the ambient temperature data of temperature sensor and exports to control
Module.Specifically, which includes the 16th resistance R16, the 17th resistance R17, the 45th resistance R45, the
46 resistance R46, the 47th resistance R47, the 48th resistance R48, the 11st capacitor C11, the 12nd capacitor C12,
13 capacitor C13, the 48th capacitor C48, operational amplifier U4 and Wiring port J3.
Wherein, connection jaws J3 is connect with temperature sensor, and temperature sensing implement body uses PTC thermistor.Tenth
The first end of six resistance R16 is connect with 5V voltage, second end respectively with the first end of the 48th capacitor C48, the 17th electricity
Hinder the first end of R17 and the non-inverting input terminal connection of operational amplifier U4.The second end of 48th capacitor C48, the tenth
The second end of seven resistance R17 is grounded.The positive supply port of operational amplifier U4 connects 5V voltage, and negative supply port is grounded,
Inverting input terminal respectively with the first end of the 45th resistance R45, the port 1 of Wiring port J3, the 48th resistance R48
One end connection.The second end of 45th resistance R45 is grounded.The output end of the operational amplifier U4 end with Wiring port J3 respectively
The first end connection of the 3, the 46th resistance R46 of mouth.The second end of 46th resistance R46 is divided into two-way, all the way with the 11st
It is grounded after capacitor C11 concatenation, another way is connect by port A_CON0 with control module.The first end of 47th resistance R47
It is connect with the port 2 of Wiring port J3, second end is divided into two-way, is grounded after concatenating all the way with the 12nd capacitor C12, another way
It is connect by port A_CON1 with control module.The second end of 48th resistance R48 is divided into two-way, all the way with the 13rd capacitor
It is grounded after C13 concatenation, another way is connect by port A_CON2 with control module.
Portable gas detector of the invention is provided with gas analysis sensor, can use analog quantity gas analysis
Sensor and digital quantity gas analysis sensor, for detecting the concentration of different types of gas, such as carbon dioxide, bromomethane
With the gases such as vikane.Corresponding analog quantity gas analysis sensor and digital quantity gas analysis sensor are respectively adopted modulus and turn
Mold changing block and level communication module are acquired sensor signal as processing module, handle and be transported to control module.
As shown in figure 14, which is used to obtain the signal of the gas analysis sensor using analog quantity, right
The signal exports after carrying out analog-to-digital conversion to control module.As shown in figure 15, which passes through Wiring port J2 and gas
Analyte sensors connection, is output to analog-to-digital conversion module after being filtered to its signal, carries out mould by modulus conversion chip U5
It exports after number conversion to control module.
As shown in figure 16, which is used to obtain the signal of the gas analysis sensor using digital quantity, right
The signal exports after carrying out level conversion to control module.The level communication module is sensed by Wiring port J5 and gas analysis
Device connection, and export after carrying out level conversion by the 7th triode D7 and the 6th triode D6 to control module.
As shown in figure 17, the power-off reset module is for detecting supply voltage, the output when supply voltage is lower than preset value
Reset signal makes to control chip and is resetted in time in order to avoid system is out of control to control module.The power-off reset module includes the 31st
Resistance R31, the 25th capacitor C25 and voltage checking chip U12.Wherein, the first end of the 31st resistance R31,
The first end of 25 capacitor C25 and the port 3 of voltage checking chip U12 are connect with 3.6V voltage.25th capacitor
The second end of C25 and the port 2 of voltage checking chip U12 are grounded.The second end and voltage detecting core of 31st resistance R31
The port 1 of piece U12 connects, and the port 1 of voltage checking chip U12 sends reset signal to control module by port NRST.
As shown in figure 18, which is used to provide temporal information for control module.The clock module includes double common cathodes
Pole Schottky diode Q9, independent battery U13, the 27th capacitor C27, the 29th capacitor, the 51st capacitor, clock core
Piece U14 and the 53rd resistance R53.Schottky diode Q9 is used for when there is cell voltage input, cuts off independent battery U13
Power supply to clock chip U14, protects independent battery, in dead battery, then by independent battery U13 and clock chip
U14 connection, makes clock chip U14 work on.
Wherein, the anode port 1 of Schottky diode Q9 is connect with the 3.6V voltage that the second voltage reduction module exports, sun
Extreme mouth 2 is connect with the first end of the anode of independent battery U13, the 27th capacitor C27 respectively, the cathode of independent battery U13,
The second end of 27th capacitor C27 is grounded.The cathode port 2 of the Schottky diode Q9 port with clock chip U14 respectively
3, the anode connection of the 51st capacitor, the cathode of the 51st capacitor, the port 4 of clock chip U14 are grounded.Clock chip
The port 5,6 and 7 of U14 is connect with control module respectively, port 8 respectively with 3.6V voltage, the 29th capacitor first end,
The first end of 53rd resistance R53 connects.The second end of 29th capacitor is grounded.The second end of 53rd resistance R53
It is connect with the port 7 of clock chip U14.As shown in figure 19, the port 1 and 2 of first crystal oscillator module and clock chip U14 connect
It connects, provides clock frequency for clock chip U14.
As shown in figure 20, which provides data storage for control module, specifically uses flash memory core
Piece U6 carries out data storage.
As shown in figure 21, which is used to communicate with input device and display device, specifically uses 485 to lead to
News circuit is communicated.The input unit such as corrects environment temperature, clear instruction, data for inputting user instruction and data
Inquiry instruction, deletion instruction and parameter setting instruction etc..The display device is for show date time, environment temperature, gas
Bulk concentration, detector state in which (detecting state or cleaning state), gas type detected etc..
As shown in figure 22, which is used for and peripheral device communication, the external equipment can be PLC, PC, leads to
News mode can be wireless telecommunications, can be exported data to external equipment by the second communication module.Second communication module tool
Body uses 485 communicating circuits.
As shown in figure 23, this is owed electric indicating module and owes electricity instruction for issuing according to the deficient electric signal of control module, to mention
The user that wakes up replaces battery or is charged that (battery in the present embodiment is rechargeable battery, is also possible in other embodiments
Dry cell).Electricity instruction is owed to realize especially by deficient electric indicator light.It includes the 21st resistance R21, second that this, which owes electric indicating module,
12 resistance R22, the 32nd resistance R32 and the 5th triode Q5.21st resistance R21, the 22nd resistance R22,
32 resistance R32 and the 5th triode Q5 form the switching circuit of triode control, receive owing for control module transmission
After electric signal, owes point indicator light LOW_LED energization and light.Wherein, the first end of the 21st resistance R21 passes through port LED_
B is connect with control module, and second end is connect with the first end of the 32nd resistance R32, the base stage of the 5th triode Q5 respectively,
The second end of 32nd resistance R32 and the emitting stage of the 5th triode Q5 are grounded.The collector of 5th triode Q5 and deficient point
The cathode of indicator light LOW_LED connects, owe after the 22nd resistance R22 of anode concatenation of point indicator light LOW_LED with VDD_BAT
Connection.
As shown in figure 24, which is used to issue indicating fault, failure according to the fault-signal of control module
Instruction is realized especially by malfunction indicator lamp.The failure indication module include the 23rd resistance R23, the 24th resistance R24,
33rd resistance R33 and the 6th triode Q6.23rd resistance R23, the 24th resistance R24, the 33rd resistance R33
The switching circuit that triode control is formed with the 6th triode Q6, after receiving the fault-signal that control module is sent, failure
Indicator light TROUBLE_LED energization lights.Wherein, the first end of the 23rd resistance R23 passes through port LED_D and control mould
Block connection, second end are connect with the first end of the 33rd resistance R33, the base stage of the 6th triode Q6 respectively, and the 33rd
The emitting stage of the second end of resistance R33 and the 6th triode Q6 are grounded.The collector and malfunction indicator lamp of 6th triode Q6
The cathode of TROUBLE_LED connects, after the 24th resistance R24 of anode concatenation of malfunction indicator lamp TROUBLE_LED with VDD_
BAT connection.
As shown in figure 25, which includes a control chip U15.As shown in figure 26, second crystal oscillator module and control
The connection of molding block provides clock frequency for control chip U15.
The control module is configured to, and according to battery detection module battery voltage signal detected, judges that battery capacity is
No abundance owes electric signal to deficient electric indicating module if it is not, exporting, lights a deficient point indicator light, user is reminded to charge.It is filling
Under electricity condition, control module judges whether battery is full of according to battery detection module battery voltage signal detected, if so,
Power down control signal is exported to charge control module, charger and battery is disconnected, stops charging.
After detector enters detecting state (detecting state triggers the operation of touch display screen by user, or according to
Automatic trigger is arranged in program, such as after detector booting and enters automatic trigger after normal operating conditions), control module is sent
Indication signal is detected to indicating module is detected, lights detection indicator light.The real-time ring that control module obtains temperature sensor
Border temperature data is exported to touch display screen, which constantly changes, and user is according to the environment temperature obtained in a period of time
Degree evidence is corrected the data, and passes through the ambient temperature data after touch display screen input correction.Control module obtains
Ambient temperature data, and pass through analog-to-digital conversion module or the signal of level communication module acquisition gas analysis sensor, the two knot
It closes, calculates and obtain gas concentration value and exported by the first communication module to touch display screen, which uses existing skill
The relevant calculation formula of gas temperature and concentration in art.Meanwhile control module can also be by shape locating for date-time, detector
In output to the touch display screens such as state (detecting state or cleaning state), gas type detected.Meanwhile control module is by gas
Bulk concentration value is compared with preset value, if gas concentration value is bigger than preset value, exports alarm signal to police instruction module, makes
Alarm lamp lights.
(triggering is operated in touch display screen by user) after detector enters cleaning state, control module sends threeway
Valve control signal controls triple valve by detection path and switches to purge path, to carry out air purging to triple valve control module
Cleaning.
When detector generates failure, control module sends fault-signal to failure indication module, keeps malfunction indicator lamp bright
It rises, call user's attention.
The control module is also connect with the sampling pump in detection path and purge path, sends a control signal to sampling pump
It controls its starting or closes.
The portable gas detector use process is as follows: will test instrument as without detection object environment in, press
Lower power knob.It owes electricity indicator light not light, prepares interface into booting, boot up preheating.After the completion of preheating, detection instruction
Lamp lights, and shows that real-time ambient temperature data, the temperature-input button of point touching display screen input school in touch display screen
Ambient temperature data after just.Sampling contact pin is placed in detection environment, touch display screen shows gas concentration value.Detection is completed
Afterwards, power knob shutdown is pressed.
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, or carries out freely to above-mentioned technical proposal
Combination, these are all within the scope of protection of the present invention.
Claims (10)
1. a kind of portable gas detector circuit characterized by comprising
Control module；
It is connect with battery, for exporting the battery power supply that cell voltage is circuit devcie power supply when cell voltage reaches preset value
Switch module；
For obtaining the ambient temperature data of temperature sensor and exporting to the temperature detecting module of the control module；
For obtaining the signal of gas analysis sensor and exporting to the processing module of the control module；
The control module is configured to, and is calculated according to ambient temperature data and gas analysis sensor signal and is obtained gas concentration value
And it exports to display device.
2. portable gas detector circuit according to claim 1, which is characterized in that further include:
It is connect with battery, for detecting cell voltage and exporting to the battery detection module of the control module；
The deficient electric indicating module for owing electricity instruction is issued according to the deficient electric signal of the control module；
The control module is configured to, and judges whether battery capacity is sufficient according to the battery voltage signal of battery detection module, if
It is no, it exports and owes electric signal to the deficient electric indicating module.
3. portable gas detector circuit according to claim 2, it is characterised in that:
The battery is rechargeable battery, is connect with charger；
It further include the charge control module for being disconnected the battery and charger according to the power down control signal of the control module；
The control module is configured to, and judges whether battery is full of according to the battery voltage signal of battery detection module, if so, defeated
Power down control signal is to the charge control module out.
4. portable gas detector circuit according to claim 1, which is characterized in that the gas analysis sensor packet
Include analog quantity gas analysis sensor and digital quantity gas analysis sensor；
The processing module includes:
It obtains the signal of the analog quantity gas analysis sensor and exports after carrying out analog-to-digital conversion to it to the control module
Analog-to-digital conversion module；
It obtains the signal of the digital quantity gas analysis sensor and exports after carrying out level conversion to it to the control module
Level communication module.
5. portable gas detector circuit according to claim 1, which is characterized in that further include:
The threeway of purge path is switched to by detection path according to the threeway valve control signal of the control module, control triple valve
Valve control module；
The control module is configured to, according to the purge signal that input unit inputs, output threeway valve control signal to described three
Port valve control module.
6. portable gas detector circuit according to claim 1, it is characterised in that: the control module is configured to,
Real-time ambient temperature data is exported to display device, and gentle according to the ambient temperature data of the correction of input unit input
Body analyte sensors signal, which calculates, to be obtained gas concentration value and exports to display device.
7. portable gas detector circuit according to claim 1, which is characterized in that further include: it is supplied with the battery
Electric switch module connection be depressured the voltage reduction module that simultaneously output buck voltage is circuit devcie power supply to cell voltage.
8. portable gas detector circuit according to claim 1, which is characterized in that further include:
The police instruction module of police instruction is issued according to the alarm signal of the control module；
The control module is configured to, and will be calculated the gas concentration value obtained and is compared with preset value, if the gas concentration value
It is bigger than preset value, then alarm signal is exported to the police instruction module.
9. portable gas detector circuit according to claim 1, which is characterized in that further include:
For detecting supply voltage, when supply voltage is lower than preset value the power down of output reset signal to the control module it is multiple
Position module；
For providing the clock module of temporal information for the control module；
For providing the memory module of data storage for the control module.
10. portable gas detector circuit according to claim 1, which is characterized in that further include:
The first communication module for being communicated with input device and display device；
For with peripheral device communication with the second communication module of output data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811643782.5A CN109633095A (en) | 2018-12-29 | 2018-12-29 | Portable gas detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811643782.5A CN109633095A (en) | 2018-12-29 | 2018-12-29 | Portable gas detector circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109633095A true CN109633095A (en) | 2019-04-16 |
Family
ID=66054805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811643782.5A Pending CN109633095A (en) | 2018-12-29 | 2018-12-29 | Portable gas detector circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110170A (en) * | 2021-04-14 | 2021-07-13 | 许昌市第二中学 | Multi-path voltage output type sensor control circuit |
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