CN107607583A - Humidity detector - Google Patents
Humidity detector Download PDFInfo
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- CN107607583A CN107607583A CN201710756150.9A CN201710756150A CN107607583A CN 107607583 A CN107607583 A CN 107607583A CN 201710756150 A CN201710756150 A CN 201710756150A CN 107607583 A CN107607583 A CN 107607583A
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- resistance
- constant current
- amplifier unit
- diode
- humidity
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Abstract
The embodiment of the present invention provides humidity detector, belongs to environmental testing.Described device includes：Constant current converting member, driving part, the first filter part and amplifier unit, the constant current converting member are used for the driving voltage for receiving input, the driving voltage of reception are converted into constant current, constant current is exported to humidity sensor and the driving part；The driving part drives humidity sensor to be operated for receiving the constant current of the constant current converting member output；First filter part is used to after the humidity inductive signal of humidity sensor output is filtered export to the amplifier unit；The amplifier unit is used for the filtered humidity inductive signal for receiving the first filter part output, is exported after the filtered humidity inductive signal received is amplified.The present invention can save the cost for realizing Humidity Detection；And add the accuracy of Humidity Detection.
Description
Technical field
The present invention relates to environmental testing, more particularly to humidity detector.
Background technology
In correlation technique, Humidity Detection is carried out using humidity sensor, humidity sensor can include electric resistance moisture sense
Answer device.The principle of electric resistance moisture inductor is：One layer of film made of wet sensory material is covered on substrate, when in air
When on humidity-sensitive film, the resistivity and resistance value of element can change water vapor adsorption, utilize the measure of the change humidity of resistance.
In the related art, using drive circuit driving humidity sensor be operated, wherein drive circuit need provide-
15V negative voltage.But may not be -15V in operating voltage used in the equipment using humidity sensor, so need be in addition
Humidity sensor configures power supply to provide -15V driving voltage, so causes the inconvenience of Humidity Detection, and adds humidity inspection
The circuit cost of survey.
The content of the invention
The purpose of the embodiment of the present invention is to provide humidity detector, to solve above-mentioned technical problem, solves at least in part
Certainly above-mentioned technical problem.
To achieve these goals, the embodiment of the present invention provides a kind of humidity detector, and described device includes：Constant current turns
Part, driving part, the first filter part and amplifier unit are changed, the constant current converting member is used for the driving electricity for receiving input
Pressure, is converted to constant current by the driving voltage of reception, constant current is exported to humidity sensor and the driving part；Institute
Driving part is stated for receiving the constant current of the constant current converting member output to drive humidity sensor to be operated；It is described
First filter part is used to after the humidity inductive signal of humidity sensor output is filtered export to the amplifier unit；Institute
The filtered humidity inductive signal that amplifier unit is used to receive the first filter part output is stated, after the filtering received
Humidity inductive signal amplification after exported.
Optionally, described device also includes：Pressure limiting part, for carrying out voltage-limiting protection to the amplifier unit.
Optionally, described device also includes：Second filter part, for the humidity exported after the amplifier unit is amplified
Induced signal is filtered.
Optionally, the constant current converting member includes the first fast recovery diode, the second fast recovery diode and PNP
Type triode, and first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance；The first fast quick-recovery two
The negative pole of the negative pole of pole pipe and second fast recovery diode accesses the driving voltage；The first fast pole of quick-recovery two
The positive pole of pipe is connected with one end of the first resistor, positive pole and the first resistor of second fast recovery diode
The other end connects；The second resistance latter end ground connection in parallel with the 3rd resistor, other end connection described first are quick extensive
The positive pole of multiple diode；4th resistance and latter terminate of the 5th resistor coupled in parallel connect into the driving voltage, the other end
Connect the emitter stage of the PNP type triode；The base stage of the PNP type triode is connecting second fast recovery diode just
Pole；The colelctor electrode output constant current of the PNP type triode.
Optionally, the driving part includes the first electric capacity, the 6th resistance and the 7th resistance；One end of first electric capacity
Ground connection, the other end access the constant current of the constant current converting member output；The constant current is accessed in one end of 6th resistance
The constant current of converting member output, the other end access the positive input of the amplifier unit；One end of 7th resistance
Ground connection, the other end connect the positive input of the amplifier unit.
Optionally, the driving part also includes the 8th resistance；8th resistance accesses the 7th resistance and described
Between the positive input of amplifier unit.
Optionally, first filter part includes the second electric capacity and the 9th resistance；9th resistance one end access is wet
The humidity inductive signal of inductor output is spent, the other end connects the reverse input end of the amplifier unit；Second electric capacity one
End connects the reverse input end of the amplifier unit, and the other end connects the positive input of the amplifier unit.
Optionally, the amplifier unit includes operational amplifier, the 3rd electric capacity, the tenth resistance and the 11st resistance；It is described
The positive input of operational amplifier is the positive input of the amplifier unit, and the reverse input end of the operational amplifier is
The reverse input end of the amplifier unit；3rd electric capacity connects the operation amplifier with one end after the tenth resistor coupled in parallel
The reverse input end of device, the other end connect the output end of the operational amplifier；Described in one end connection of 11st resistance
The output end of operational amplifier, the other end connect the output end of the amplifier unit.
Optionally, the pressure limiting part includes the 12nd resistance, the 3rd fast recovery diode, the first diode and second
Diode；One end access high level of 12nd resistance, the other end connect the negative pole of the 3rd fast recovery diode；
The plus earth of 3rd fast recovery diode；The negative pole of first diode connects the 3rd fast pole of quick-recovery two
The negative pole of pipe, the positive pole of first diode connect the output end of the amplifier unit；The negative pole of second diode connects
The negative pole of first diode is connect, the positive pole of second diode connects the positive input of the amplifier unit.
Optionally, second filter part includes the 4th electric capacity and the 13rd resistance；One end of 13rd resistance
Humidity inductive signal after access amplification, the other end connect the output end of second filter part, export filtered amplification
Humidity inductive signal；One end ground connection of 4th electric capacity, the other end connect the output end of second filter part.
Pass through above-mentioned technical proposal, because when the driving voltage provided changes within the specific limits, constant current converter section
Part can ensure output constant current, and driving part can be operated using constant current driven humidity sensor again, such as
This, without setting power supply exclusively for humidity sensor in addition, has saved the cost for realizing Humidity Detection；And in spread of voltage
When changing, ensure that the work of humidity sensor is unaffected, add the accuracy of Humidity Detection.
The further feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, with
The embodiment in face is used to explain the embodiment of the present invention together, but does not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is the structure chart of humidity detector according to embodiments of the present invention；
Fig. 2 is the structure chart of humidity detector according to embodiments of the present invention；
Fig. 3 is the structure chart of humidity detector according to embodiments of the present invention；
Fig. 4 is the circuit diagram of humidity detector according to embodiments of the present invention；And
Fig. 5 is the schematic diagram for the equivalent circuit that humidity sensor according to embodiments of the present invention carries out Humidity Detection.
Embodiment
The embodiment of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this
The embodiment of place description is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention embodiment.
Fig. 1 is the structure chart of humidity detector according to embodiments of the present invention, and the device can be used for any required detect
In the equipment of humidity, such as in micro-wave oven, as shown in figure 1, the device may include：Constant current converting member 110, driving part 120,
First filter part 130 and amplifier unit 140.
Constant current converting member 110 is used for the driving voltage for receiving input, and the driving voltage of reception is converted into constant current,
Constant current is exported to humidity sensor and driving part 120.
In one embodiment, constant current converting member 110 may include the first fast recovery diode, the second fast pole of quick-recovery two
Pipe and PNP type triode, and first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance.First is quick extensive
The negative pole of multiple diode and the negative pole access driving voltage of the second fast recovery diode, the positive pole of the first fast recovery diode
It is connected with one end of first resistor, the positive pole of the second fast recovery diode and the other end of first resistor connect；Second resistance
Latter end ground connection in parallel with 3rd resistor, the other end connect the positive pole of the first fast recovery diode；4th resistance and the 5th electricity
Resistance latter terminate in parallel connects the emitter stage of PNP type triode into driving voltage, the other end；The base stage connection of PNP type triode
The positive pole of second fast recovery diode；The colelctor electrode output constant current of PNP type triode.
For example, as shown in figure 4, constant current converting member 110 may include the fast quick-recoveries of PNP type triode Q200 and first
Diode Z200, the second fast recovery diode Z201, and first resistor R207, second resistance R211,3rd resistor R201,
Driving voltage is converted to constant current by the 4th resistance R209 and the 5th resistance R206, constant current converting member 110.For example, when drive
, can be with due to the saturability of triode and the rectification characteristic of fast recovery diode when dynamic voltage changes in the range of 9V-15V
Ensure output constant current 29mA.
Driving part 120 drives humidity sensor to carry out for receiving the constant current of the output of constant current converting member 110
Work.
In one embodiment, driving part 120 includes the first electric capacity, the 6th resistance and the 7th resistance.The one of first electric capacity
End ground connection, the constant current of the output of other end access constant current converting member 110；One end access constant current converting member of 6th resistance
The constant current of 110 outputs, the other end access the positive input of amplifier unit 140；One end ground connection of 7th resistance, the other end
Connect the positive input of amplifier unit 140.
Further, driving part 120 also includes the 8th resistance；8th resistance accesses the 7th resistance and amplifier unit 140
Positive input between.
For example, as shown in figure 4, the electric capacity C204 of driving part 120 first, the 6th resistance R205, the 7th resistance R208
With the 8th resistance R210.As shown in figure 5, the 6th resistance R205, the 7th resistance R208 and the 8th resistance R210 and humidity sensor
Constant resistance R1 and inductive reactance R2 the composition electric bridge of itself.Constant current from constant current converting member 110 flows through this electric bridge.
When the water vapor adsorption in air is when on the humidity-sensitive film of humidity sensor, the inductive reactance R2's of the humidity sensor in Fig. 5
Resistivity and resistance value change, and cause the voltage drop of constant resistance R1 and inductive reactance R2 on electric bridge to change, make
Potential at node b changes, therefore constant resistance R1 and inductive reactance R2 this electric current all the way will change, according to
Kirchhoff's law, and the 6th resistance R205 and the 7th resistance R208, the electric current of the 8th this side of resistance R210 will also be sent out on electric bridge
Changing.So so that the potential at node a will also change, and thus (i.e. humidity sensor output is wet by node a and node b
Spend induced signal SEN3 ends) produce be different from water vapor adsorption on the humidity-sensitive film of humidity sensor before voltage difference.
In addition, the resistance of the 8th resistance R210 resistance can be configured so that the signal after amplifier unit 140 amplifies
Meet the amplitude range demand of detection.
First filter part 130 is used to after the humidity inductive signal of humidity sensor output is filtered export to amplification
Part 140.
In one embodiment, the first filter part 130 includes the second electric capacity and the 9th resistance；The access of 9th resistance one end is wet
The humidity inductive signal of inductor output is spent, the other end connects the reverse input end of amplifier unit 140；Second electric capacity one end connects
The reverse input end of amplifier unit 140, the other end connect the positive input of amplifier unit 140.
As shown in figure 4, the first filter part 130 includes the second electric capacity C202 and the 9th resistance R204.First filter part
The 130 humidity inductive signals for exporting the SEN3 ends of humidity sensor input a signal into amplifier unit 140 after carrying out bandpass filtering.
Amplifier unit 140 is used for the filtered humidity inductive signal for receiving the output of the first filter part 130, will be received
Filtered humidity inductive signal amplification after exported.
In one embodiment, amplifier unit 140 includes operational amplifier, the 3rd electric capacity, the tenth resistance and the 11st resistance.
Wherein, the positive input of operational amplifier is the positive input of amplifier unit, and the reverse input end of operational amplifier is institute
State the reverse input end of amplifier unit.The reverse input of one end concatenation operation amplifier after 3rd electric capacity and the tenth resistor coupled in parallel
End, the output end of other end concatenation operation amplifier；The output end of one end concatenation operation amplifier of 11st resistance, the other end
Connect the output end of amplifier unit.
As shown in figure 4, amplifier unit 140 include operational amplifier IC200B, the 3rd electric capacity C201, the tenth resistance R203 and
11st resistance R202.Amplifier unit 140 exports after can humidity inductive signal be amplified, such as 200 times of amplification.
In one embodiment, as shown in Fig. 2 described device may also include：Second filter part 150, for by enlarging section
The humidity inductive signal that part 140 exports after amplifying is filtered.
Second filter part 150 may include the 4th electric capacity and the 13rd resistance；After one end access amplification of 13rd resistance
Humidity inductive signal, the other end connect the second filter part 150 output end, export filtered amplification humidity inductive letter
Number；One end ground connection of 4th electric capacity, the other end connect the output end of the second filter part 150.
As shown in figure 4, the second filter part 150 includes the 4th electric capacity C200 and the 13rd resistance R200.
Second filter part 150 exports after being filtered to the humidity inductive signal after amplification, such as exports stable electricity
Press AD values HU_AD.Single-chip microcomputer can receive the magnitude of voltage, and the magnitude of voltage received is converted into corresponding AD values, according to AD
The size option program of value performs corresponding function, so as to reach the Detection results of corresponding humidity inductive.
By technical scheme in above-described embodiment, without setting power supply exclusively for humidity sensor in addition, realization has been saved
The cost of Humidity Detection；And when spread of voltage changes, ensure that the work of humidity sensor is unaffected, increase
The accuracy of Humidity Detection is added.
In one embodiment, as shown in figure 3, described device may also include：Pressure limiting part 160, for amplifier unit 140
Carry out voltage-limiting protection.
For example, pressure limiting part 160 includes the 12nd resistance, the 3rd fast recovery diode, the first diode and the two or two
Pole pipe.One end access high level of 12nd resistance, the other end connect the negative pole of the 3rd fast recovery diode；3rd is quick extensive
The plus earth of multiple diode；The negative pole of first diode connects the negative pole of the 3rd fast recovery diode, the first diode
Positive pole connects the output end of amplifier unit；The negative pole of second diode connects the negative pole of the first diode, and the second diode is just
Pole connects the positive input of amplifier unit.
As shown in figure 4, pressure limiting part 160 includes the 12nd resistance R212, the 3rd fast recovery diode Z202, the one or two
Pole pipe D200 and the second diode D201.
4.3V benchmark can be provided by the 3rd fast recovery diode Z202, this basic point voltage adds the second diode D201
0.7V conduction voltage drops, the voltage for protection of rationing the power supply is limited in 5.0V.Circuit voltage-limiting protection voltage is 5.0V, and it is less than chip
Maximum working voltage (for example, 5.5V), is advantageous to the protection of chip port.
Using technical scheme in the present embodiment, the protection to chip can be improved, increases the reliability of detection.
Annexation is used to enter technical scheme in the present invention between circuit element and circuit element used in above-described embodiment
Row exemplary illustration, is not used in and limits the scope of the invention.In the case of being that the goal of the invention of the present invention is consistent,
Those skilled in the art can realize this hair using any suitable annexation between circuit element and circuit element
This is not particularly limited by the function of each functional part in bright, the present invention.
The optional embodiment of example of the present invention, still, the embodiment of the present invention and unlimited are described in detail above in association with accompanying drawing
Detail in above-mentioned embodiment, can be to the embodiment of the present invention in the range of the technology design of the embodiment of the present invention
Technical scheme carry out a variety of simple variants, these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
It will be appreciated by those skilled in the art that realize that all or part of step in above-described embodiment method is to pass through
Program instructs the hardware of correlation to complete, and the program storage is in the storage medium, including some instructions are causing one
Individual (can be single-chip microcomputer, chip etc.) or processor (processor) perform the whole of each embodiment methods described of the application
Or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
In addition, it can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is run counter to, it should equally be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of humidity detector, it is characterised in that described device includes：Constant current converting member, driving part, the first filtering
Part and amplifier unit,
The constant current converting member is used for the driving voltage for receiving input, and the driving voltage of reception is converted into constant current, will
Constant current is exported to humidity sensor and the driving part；
The driving part drives humidity sensor to carry out work for receiving the constant current of the constant current converting member output
Make；
First filter part is used to after the humidity inductive signal of humidity sensor output is filtered export to put to described
Big part；
The amplifier unit is used for the filtered humidity inductive signal for receiving the first filter part output, by what is received
Exported after filtered humidity inductive signal amplification.
2. device according to claim 1, it is characterised in that described device also includes：
Pressure limiting part, for carrying out voltage-limiting protection to the amplifier unit.
3. device according to claim 1, it is characterised in that described device also includes：
Second filter part, the humidity inductive signal for being exported after the amplifier unit is amplified are filtered.
4. device according to claim 1, it is characterised in that the constant current converting member includes the first fast pole of quick-recovery two
Pipe, the second fast recovery diode and PNP type triode, and first resistor, second resistance, 3rd resistor, the 4th resistance and
5th resistance；
The negative pole of the negative pole of first fast recovery diode and second fast recovery diode access driving electricity
Pressure；
The positive pole of first fast recovery diode is connected with one end of the first resistor, the second fast pole of quick-recovery two
The positive pole of pipe is connected with the other end of the first resistor；
The second resistance latter end ground connection in parallel with the 3rd resistor, the other end connect first fast recovery diode
Positive pole；
4th resistance and latter terminate of the 5th resistor coupled in parallel connect the positive-negative-positive into the driving voltage, the other end
The emitter stage of triode；
The base stage of the PNP type triode connects the positive pole of second fast recovery diode；
The colelctor electrode output constant current of the PNP type triode.
5. device according to claim 1, it is characterised in that the driving part include the first electric capacity, the 6th resistance and
7th resistance；
One end ground connection of first electric capacity, the other end access the constant current of the constant current converting member output；
The constant current of the constant current converting member output is accessed in one end of 6th resistance, and the other end accesses the enlarging section
The positive input of part；
One end ground connection of 7th resistance, the other end connect the positive input of the amplifier unit.
6. device according to claim 5, it is characterised in that the driving part also includes the 8th resistance；
8th resistance is accessed between the 7th resistance and the positive input of the amplifier unit.
7. device according to claim 1, it is characterised in that first filter part includes the second electric capacity and the 9th electricity
Resistance；
The humidity inductive signal of 9th resistance one end access humidity sensor output, the other end connect the amplifier unit
Reverse input end；
Described second electric capacity one end connects the reverse input end of the amplifier unit, and the other end connects the forward direction of the amplifier unit
Input.
8. device according to claim 1, it is characterised in that the amplifier unit include operational amplifier, the 3rd electric capacity,
Tenth resistance and the 11st resistance；
The positive input of the operational amplifier be the amplifier unit positive input, the operational amplifier it is reverse
Input is the reverse input end of the amplifier unit；
3rd electric capacity connects the reverse input end of the operational amplifier, the other end with one end after the tenth resistor coupled in parallel
Connect the output end of the operational amplifier；
One end of 11st resistance connects the output end of the operational amplifier, and the other end connects the defeated of the amplifier unit
Go out end.
9. device according to claim 2, it is characterised in that the pressure limiting part includes the 12nd resistance, the 3rd quick
Recovery diode, the first diode and the second diode；
One end access high level of 12nd resistance, the other end connect the negative pole of the 3rd fast recovery diode；
The plus earth of 3rd fast recovery diode；
The negative pole of first diode connects the negative pole of the 3rd fast recovery diode, the positive pole of first diode
Connect the output end of the amplifier unit；
The negative pole of second diode connects the negative pole of first diode, described in the positive pole connection of second diode
The positive input of amplifier unit.
10. device according to claim 3, it is characterised in that second filter part includes the 4th electric capacity and the tenth
Three resistance；
Humidity inductive signal after one end access amplification of 13rd resistance, the other end connect second filter part
Output end, export the humidity inductive signal of filtered amplification；
One end ground connection of 4th electric capacity, the other end connect the output end of second filter part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756150.9A CN107607583B (en) | 2017-08-29 | 2017-08-29 | Humidity detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756150.9A CN107607583B (en) | 2017-08-29 | 2017-08-29 | Humidity detection device |
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| Publication Number | Publication Date |
|---|---|
| CN107607583A true CN107607583A (en) | 2018-01-19 |
| CN107607583B CN107607583B (en) | 2020-08-04 |
Family
ID=61056162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710756150.9A Active CN107607583B (en) | 2017-08-29 | 2017-08-29 | Humidity detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108852013A (en) * | 2018-05-11 | 2018-11-23 | 广东美的厨房电器制造有限公司 | Absolute humidity detection device, method and cooking apparatus for cooking apparatus |
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|---|---|---|---|---|
| CN108852013A (en) * | 2018-05-11 | 2018-11-23 | 广东美的厨房电器制造有限公司 | Absolute humidity detection device, method and cooking apparatus for cooking apparatus |
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| CN107607583B (en) | 2020-08-04 |
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