CN109781797A - TVOC gas sensing devices, air processor - Google Patents
TVOC gas sensing devices, air processor Download PDFInfo
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- CN109781797A CN109781797A CN201910190388.9A CN201910190388A CN109781797A CN 109781797 A CN109781797 A CN 109781797A CN 201910190388 A CN201910190388 A CN 201910190388A CN 109781797 A CN109781797 A CN 109781797A
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Abstract
The invention discloses a kind of TVOC gas sensing devices, air processor, wherein TVOC gas sensing devices, comprising: gas sensor, absorption VOC gas generate corresponding change in resistance；Heating sheet maintains the operating temperature of the gas sensor；Sample circuit detects the resistance value of the gas sensor；Circuit is adjusted, the temperature of the heating sheet is controlled；Control module controls the temperature for adjusting circuit and adjusting the heating sheet, so that the gas sensor is had corresponding sensitivity for different VOC gas, according to the concentration of VOC gas described in preset sensitivity parameter and detected computing the resistor value.The present invention can detect more accurate VOC gas concentration according to respective situation.
Description
Technical field
The present invention relates to TVOC gas sensing devices, and fill using the air-treatment of the TVOC gas sensing devices
It sets.
Background technique
VOC gas pollutant (volatile organic compound) detection is very universal in new blower and air purifier,
But its detection target is more general, can not accurately be detected for different application scenarios.
Be mainly human metabolite or furniture metabolin etc. when application scenarios are parlor, generally acetone, ethyl alcohol,
Formaldehyde etc..When application scenarios are bedroom, mainly body metabolism, cosmetics and dress ornament dissipate gas, generally acetone, first
Aldehyde, limonene, alcohols etc..When application scenarios are kitchen, mainly soot gas, generally hydrocarbon, CO etc..
According to the other gas sensor working characteristics of civil, gas sensitive is different to the sensitivity curve of gas with various
Sample.Because sensor can not detect the type of specific gas, present gas sensor processing method is using identical
One sensitivity curve causes varying environment that can not be adapted to corresponding gas sensitivity and carries out concentration output, to export result
It is not accurate enough.
Summary of the invention
For the skill that the sensitivity curve single concentration for leading to detection when solving to detect VOC gas in the prior art is not accurate enough
Art problem, the invention proposes a kind of TVOC gas sensing devices, comprising:
Gas sensor, absorption VOC gas generate corresponding change in resistance；
Heating sheet maintains the operating temperature of the gas sensor；
Sample circuit detects the resistance value of the gas sensor；
Circuit is adjusted, the temperature of the heating sheet is controlled；
Control module controls the temperature that the adjusting circuit adjusts the heating sheet according to different set contents, makes the gas
Quick element has corresponding sensitivity for different set contents, is joined according to the corresponding preset sensitivity of the set content
The concentration of VOC gas described in several and detected computing the resistor values.
Specifically, the set content includes: application scenarios, type of gas source, adaptive setting and works as without set content
At least one of.The type of gas source includes that formaldehyde, benzene class, ethyl alcohol and CO at least one of work as.
In one embodiment, when set content is adaptive setting or when without set content, the temperature of the heating sheet and
Its corresponding preset sensitivity is sampled to obtain by the control module with some cycles.Specifically, the control module is one
The heating sheet is adjusted in a period and is in different temperature, and resistance value detected at all temperature is pressed into preset fitting function
It is fitted, obtains the minimum resistance value and its corresponding temperature of the fitting function, obtained by the corresponding temperature of minimum resistance value
The corresponding preset sensitivity of the temperature.
Further, further include display module for showing the concentration of the VOC gas and input the set content
Input module.
Preferably, the temperature and sensitivity parameter are the corresponding temperature of maximum concentration that the VOC gas can be detected
And sensitivity parameter.
Specifically, the VOC gas according to detected by preset sensitivity parameter and the computing the resistor value detected
Concentration is specially to use concentration function S=k × eC*(Rs_air/Rs)It calculating, the S is the concentration of the VOC gas, the k,
C is preset sensitivity parameter, and the e is irrational number, and the Rs_air is the maximum resistance during the gas sensor powers on
Value, the Rs are the resistance value detected by the sample circuit.The value range of the k is 0.05 ~ 0.5.The C's takes
Being worth range is 0 ~ 1.
Specifically, the material that the gas sensor uses includes metal semiconductor oxide.The sample circuit includes electricity
Pressure sampling circuit is hindered, the electric resistance partial pressure sample circuit detects the resistance value of the gas sensor.The sample circuit further includes
R/V sample circuit, the resistance value that the R/V sample circuit will test are then forwarded to the control after being converted into voltage analog signal
Module.The adjusting circuit is that PWM adjusts circuit, and the PWM adjusts circuit and exports difference according to the instruction of the control module
PWM pulsewidth be in different temperatures to control the heating sheet.
The present invention also proposes a kind of air processor, using TVOC detector described in above-mentioned technical proposal
Part.The air processor includes that air purifier, new blower, air-conditioning at least one of are worked as.
The operating temperature that TVOC gas sensing devices of the invention maintain gas sensor different for different situations, makes gas
Quick element in the case where correspondence have relatively accurately sensitivity, can more accurately measure the concentration of VOC gas, when with
When family is not provided with any situation, TVOC gas sensing devices of the invention can also pass into adaptive model, be calculated most
Good operating temperature finds the value of the corresponding sensitivity parameter of the operating temperature, then carries out the concentration output of VOC gas,
Keep its result relatively accurate.
Detailed description of the invention
Below with reference to embodiment and attached drawing, the present invention is described in detail, in which:
Fig. 1 is hardware block diagram of the invention.
Fig. 2 is the schematic diagram for sampling trend curve.
Specific embodiment
The principle and embodiment that the invention will now be described in detail with reference to the accompanying drawings.
What Fig. 1 was shown is the entirety using the specific airhandling equipment of TVOC gas sensing devices of the invention
Hardware connects block diagram.When TVOC gas sensing devices are applied in specific airhandling equipment, in order not to give air-treatment
The master control borad of equipment brings burden, has been made into the pattern of standalone module, the control module and master control borad of TVOC gas sensing devices
It is communicated, receives the command adapted thereto of master control borad to cooperate the operation of airhandling equipment.
In a preferred embodiment, TVOC gas sensing devices of the invention are in addition to control module, further includes: gas sensitive element
Part, sample circuit, adjusts circuit, input module and display module at heating sheet.
The material that gas sensor uses includes metal semiconductor oxide, and metal semiconductor oxide is at a suitable temperature
VOC gas can be adsorbed and generate corresponding change in resistance.Heating sheet is used to maintain the operating temperature of gas sensor.Adjust circuit control
The temperature of heating sheet in the present embodiment, adjusts circuit using PWM and adjusts circuit, PWM adjusts circuit according to the finger of control module
The PWM pulsewidth for enabling output different is in different temperatures to control heating sheet.Sample circuit can detecte the resistance value of gas sensor, this
In embodiment, sample circuit includes electric resistance partial pressure sample circuit and R/V sample circuit, and electric resistance partial pressure sample circuit detects gas sensitive element
The resistance value of part, the resistance value that R/V sample circuit will test are then forwarded to the control module after being converted into voltage analog signal.
In the present embodiment, air processor itself is utilized in the input module and display module of TVOC gas sensing devices
The input that has, display module substitute, and avoid hardware redundancy.Input module is used to input corresponding set content, specifically
Set content includes following one or more: application scenarios, type of gas source and adaptive setting.Such as user can be
The end mobile phone A pp or other interaction ends are configured indoor application scenarios, wherein application scenarios include parlor, bedroom and kitchen
Room etc..Type of gas source includes formaldehyde, benzene class, ethyl alcohol, CO etc..Control module is adjusted according to the received set content of input module
It saves the temperature of heating sheet and selects preset sensitivity.
When control module, which gets user, has been provided with a kind of application scenarios, it is assumed that set by user is bedroom.Control
Module controls to adjust the temperature that circuit adjusts heating sheet, has gas sensor for VOC gas common in bedroom corresponding
Sensitivity calculates the concentration of detected VOC gas according to preset sensitivity parameter and currently detected resistance value.
Specifically, the concentration of the VOC gas in bedroom exports are as follows:
S=fBedroom(R)；
fBedroom() is the concentration function for bedroom.Specifically, concentration S=k × e of VOC gasC*(Rs_air/Rs), wherein k, C
For preset sensitivity parameter, e is irrational number, and Rs_air is the maximum resistance value during gas sensor powers on, and Rs is sampling electricity
The resistance value of gas sensor detected by road.K value range is that 0.05 ~ 0.5, C value range is 0 ~ 1.Two sensitivity parameters
Be test and generate through laboratory integration by counting the common release gas of each application scenarios come.Such as bedroom is common
Release gas includes the acetone of body metabolism, ethyl alcohol etc. as test object.Specific electric resistance partial pressure sample circuit measures resistance value Rs
When, the formula used is Rs=(Vc × RL)/VRL-RL, wherein Vc is the gas sensor and concatenated divider resistance R of measurementLTwo
Hold voltage；RLFor the resistance value of concatenated divider resistance；VRLFor the voltage value at divider resistance both ends.
Likewise, when user input be other application scenarios either type of gas source when and similar mode can
To obtain the concentration of VOC gas.Preferably, the temperature of heating sheet and sensitivity parameter, which are preferably chosen, can be detected VOC gas
The corresponding temperature of maximum concentration and sensitivity.
When user is not configured (as without set content) or set content is adaptive setting, the temperature of heating sheet
Degree and its corresponding preset sensitivity are sampled to obtain by control module with some cycles.I.e. control module with certain period into
Row judge optimum working temperature, selects most suitable sensitivity, such as 24 hours or 100h judges once at equal intervals.
It is exemplified below: temperature of the control module with certain period by adjusting circuit output pwm pulse-width regulated heating sheet,
Make gas sensing resistance under corresponding operating temperature continuous operation for a period of time after, acquire the detected resistance value at the moment.It will
Resistance value at detected all working temperature (temperature) carries out data fitting by preset fitting function, and obtains the fitting
Operating temperature (temperature) under the minimum resistance value of function.Following table is exactly all working temperature sampled and the resistance value detected, is incited somebody to action
Temperature in following table and corresponding resistance value generate trend curve (the i.e. corresponding preset fitting function of the trend curve), can be in the hope of
Obtain minimum (the as minimum resistance value R of the trend curveIt is minimum), as shown in Figure 2.According to the characteristic of gas sensor material, resistance value
Lower, the concentration of the VOC gas detected is higher, i.e., under identical environment, the minimum resistance value exported under different temperatures, which is
For the operating temperature (T for detecting VOC gas adaptation in the indoor environmentOptimum working temperature), which is reversely obtained by the operating temperature
At a temperature of sensitivity parameter corresponding to corresponding gas type value, the value of the sensitivity parameter under the operating temperature is
It is default.
Control module obtains the resistance value of gas sensor detected, and the resistance value is substituted into corresponding by concentration function
The value of sensitivity parameter can calculate the concentration of corresponding VOC gas, which is value the most accurate under the environment.
For the data jump for preventing display module, the data difference of the replacement such as sensitivity parameter front and back under identical environment is considered
Property, replace sensitivity parameter before and after data by way of gradually declining or gradually rising to newest concentration values.
TVOC gas sensing devices of the invention can be applied in various air processors, including but not limited to air
Clarifier, new blower, air-conditioning, air detecting device etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (17)
1. a kind of TVOC gas sensing devices characterized by comprising
Gas sensor, absorption VOC gas generate corresponding change in resistance；
Heating sheet maintains the operating temperature of the gas sensor；
Sample circuit detects the resistance value of the gas sensor；
Circuit is adjusted, the temperature of the heating sheet is controlled；
Control module controls the temperature that the adjusting circuit adjusts the heating sheet according to different set contents, makes the gas
Quick element has corresponding sensitivity for different set contents, is joined according to the corresponding preset sensitivity of the set content
The concentration of VOC gas described in several and detected computing the resistor values.
2. TVOC gas sensing devices as described in claim 1, which is characterized in that the set content include: application scenarios,
Type of gas source, adaptive setting and at least one of work as without set content.
3. TVOC gas sensing devices as claimed in claim 2, which is characterized in that the type of gas source includes formaldehyde, benzene
Class, ethyl alcohol and CO at least one of work as.
4. TVOC gas sensing devices as claimed in claim 2, which is characterized in that when set content is adaptive setting or nothing
When set content, the temperature of the heating sheet and its corresponding preset sensitivity are sampled by the control module with some cycles
It obtains.
5. TVOC gas sensing devices as claimed in claim 4, which is characterized in that the control module is adjusted in one cycle
It saves the heating sheet and is in different temperature, resistance value detected at all temperature is fitted by preset fitting function,
It is corresponding to obtain the temperature by the corresponding temperature of minimum resistance value for the minimum resistance value and its corresponding temperature for obtaining the fitting function
Preset sensitivity.
6. TVOC gas sensing devices as described in claim 1, which is characterized in that further include for showing the VOC gas
Concentration display module.
7. TVOC gas sensing devices as described in claim 1, which is characterized in that further include for inputting the set content
Input module.
8. TVOC gas sensing devices as described in claim 1, which is characterized in that the temperature and preset sensitivity parameter
The corresponding temperature of maximum concentration and sensitivity parameter for the VOC gas can be detected.
9. TVOC gas sensing devices as described in claim 1, which is characterized in that it is described according to preset sensitivity parameter and
The concentration of the computing the resistor value VOC gas detected is specially to use concentration function S=k × eC*(Rs_air/Rs)It calculates, the S
For the concentration of the VOC gas, described k, C are preset sensitivity parameter, and the e is irrational number, and the Rs_air is described
Gas sensor powers on the maximum resistance value of period, and the Rs is the resistance value detected by the sample circuit.
10. TVOC gas sensing devices as claimed in claim 9, which is characterized in that the value range of the k be 0.05 ~
0.5。
11. TVOC gas sensing devices as claimed in claim 9, which is characterized in that the value range of the C is 0 ~ 1.
12. the TVOC gas sensing devices as described in claim 1 to 11, which is characterized in that the material that the gas sensor uses
Material includes metal semiconductor oxide.
13. the TVOC gas sensing devices as described in claim 1 to 11, which is characterized in that the sample circuit includes resistance
Pressure sampling circuit, the electric resistance partial pressure sample circuit detect the resistance value of the gas sensor.
14. TVOC gas sensing devices as claimed in claim 13, which is characterized in that the sample circuit further includes that R/V is adopted
Sample circuit, the resistance value that the R/V sample circuit will test are then forwarded to the control module after being converted into voltage analog signal.
15. the TVOC gas sensing devices as described in claim 1 to 11, which is characterized in that the adjusting circuit is PWM adjusting
Circuit, the PWM adjust circuit and export different PWM pulsewidths according to the instruction of the control module to control at the heating sheet
In different temperatures.
16. a kind of air processor, which is characterized in that using the TVOC gas as described in claim 1 to 15 any one
Detector part.
17. air processor as claimed in claim 16, which is characterized in that the air processor includes air cleaning
Device, new blower, air-conditioning at least one of are worked as.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910190388.9A CN109781797A (en) | 2019-03-13 | 2019-03-13 | TVOC gas sensing devices, air processor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910190388.9A CN109781797A (en) | 2019-03-13 | 2019-03-13 | TVOC gas sensing devices, air processor |
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| CN109781797A true CN109781797A (en) | 2019-05-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112198197A (en) * | 2020-10-13 | 2021-01-08 | 海南聚能科技创新研究院有限公司 | Formaldehyde gas sensor module |
| CN112710701A (en) * | 2020-12-21 | 2021-04-27 | 深圳市康弘环保技术有限公司 | Air concentration monitoring system and method and air purifier |
| CN113358711A (en) * | 2020-07-21 | 2021-09-07 | 艾感科技(广东)有限公司 | Method and device for preparing gas sensor array by regulating light and temperature |
| WO2022141475A1 (en) * | 2020-12-31 | 2022-07-07 | 广州奥松电子有限公司 | Measurement system and apparatus, and measurement method and temperature and humidity compensation method therefor |
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