CN206057233U - A kind of humidity sensor - Google Patents
A kind of humidity sensor Download PDFInfo
- Publication number
- CN206057233U CN206057233U CN201520924356.4U CN201520924356U CN206057233U CN 206057233 U CN206057233 U CN 206057233U CN 201520924356 U CN201520924356 U CN 201520924356U CN 206057233 U CN206057233 U CN 206057233U
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- CN
- China
- Prior art keywords
- encapsulating compound
- layer encapsulating
- dew cell
- resistance
- internal layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of humidity sensor, on the wiring board, the internal layer encapsulating compound is coated on the wiring board to the dew cell, and the internal layer filter paper is adhered on the dew cell；The outer layer encapsulating compound is coated on the internal layer encapsulating compound, and makes the dew cell be revealed in the outer layer encapsulating compound；The metal shell is coated on the outer layer encapsulating compound, and the metal shell is provided with a perforate, and the dew cell is located at the underface of the perforate, and the outer filter paper is adhered at the opening of the perforate, and is located above the internal layer filter paper；Described dew cell includes dew cell substrate and the dew cell electrode being arranged on the dew cell substrate, also including the hydrophilic low-resistance humidity-sensitive film and hydrophobic high resistant humidity-sensitive film being successively set on the dew cell electrode.Dew cell described in the utility model is connected with wiring board, and humidity sensor has dust-proof, waterproof and low temperature resistant effect.
Description
Technical field
This utility model is related to a kind of humidity sensor.
Background technology
Conventional moisture sensors are in departments such as industrial and agricultural production, meteorology, environmental protection, national defence, scientific research, space flight, it is often necessary to right
Ambient humidity is measured and is controlled.But in conventional ambient parameter, humidity is a parameter for being most difficult to accurate measurement.Humidity
Sensor is gathering the data of moisture in air, to feed back to central processing unit by digital analogue signal by dew cell,
The measures such as a series of dehumidifying, humidification are taken according to the humidity condition of detection environment so as to which environment reaches perfect condition.
Utility model content
The purpose of this utility model is to provide a kind of humidity sensor, and which can solve the disadvantages mentioned above of prior art product.
This utility model is employed the following technical solutions：
A kind of humidity sensor, including wiring board, dew cell, internal layer encapsulating compound, internal layer filter paper, outer layer encapsulating compound,
Metal shell and outer filter paper；
On the wiring board, the internal layer encapsulating compound is coated on the wiring board to the dew cell, and makes described
Dew cell is revealed in the internal layer encapsulating compound, and the internal layer filter paper is adhered on the dew cell；
The outer layer encapsulating compound is coated on the internal layer encapsulating compound, and makes the dew cell be revealed in the outer layer encapsulating
Glue；
The metal shell is coated on the outer layer encapsulating compound, and the metal shell is provided with a perforate, the wet sensitive unit
Part is located at the underface of the perforate, and the outer filter paper is adhered at the opening of the perforate, and is located at the internal layer mistake
Above filter paper；
Described dew cell includes dew cell substrate and the dew cell electricity being arranged on the dew cell substrate
Pole, also including the hydrophilic low-resistance humidity-sensitive film and hydrophobic high resistant humidity-sensitive film being successively set on the dew cell electrode, institute
It is the hydrophilic low-resistance humidity-sensitive film by obtained in chlorination quaternized ammonium to state hydrophilic low-resistance humidity-sensitive film, the hydrophobic high resistant humidity-sensitive film
It is the hydrophobic high resistant humidity-sensitive film by obtained in silane quaternary ammonium salt, the hydrophilic low-resistance humidity-sensitive film and the hydrophobic high resistance sense are wet thin
Film passes through heat cross-linking process combining together.
The wiring board is integrally formed with the internal layer encapsulating compound, and the outer layer encapsulating compound and the internal layer encapsulating compound are integrally
Molding.
Two metal canulas penetrate the wiring board, the internal layer encapsulating compound, the outer layer encapsulating compound and described simultaneously
Metal shell.
Two metal sleeves are symmetricly set in the both sides of the wiring board, and with internal layer encapsulating compound one into
Type.
Waterproof grommet is provided with the outside of the acquisition port of the dew cell.
The wiring board includes a sensor circuit, and the sensor circuit includes first input end, the second input
Terminal, first lead-out terminal, the second lead-out terminal, amplify the voltage of the sensor element generation that four bridge-type equivalent resistances are constituted
And export, the sensor circuit also includes：
First stage amplifier, which includes：The first constant-current source being connected in series between power supply terminal and ground terminal and first
MOS transistor and first and second resistance, second be connected in series between the power supply terminal and the ground terminal are permanent
Stream source and the second MOS transistor and the 3rd with the 4th resistance, in the first defeated of the power supply terminal and the sensor element
Enter the first resistor composition that is connected in series between terminal and current mirror is connected to the 3rd MOS crystal of first MOS transistor
Pipe, and the second resistance composition that is connected in series between the first input end of the power supply terminal and the sensor element
The 4th MOS transistor of second MOS transistor, the junction point connection of first and second resistance are connected to current mirror
To the first lead-out terminal of the sensor element, the junction point of the 3rd and the 4th resistance is connected to the sensor element
The second lead-out terminal；
Constantvoltage generation circuit, which is included in the 3rd constant-current source and the 5th being connected in series between power supply terminal and ground terminal
MOS transistor and the 5th and the 6th resistance, the constantvoltage generation circuit produce constant pressure；Two-stage amplifier, its inverting input
Son is connected to the drain electrode of the 3rd MOS transistor, and non-inverting input terminal is connected to the drain electrode of the 4th MOS transistor,
Anti-phase output terminal is connected to the anti-phase output terminal of the sensor circuit, and non-inverted output terminal is connected to the sensor
The non-inverted output terminal of circuit, is input into the constant pressure, outputting common voltage feedback terminal in outputting common voltage input terminal
The voltage of the middle first input end for being input into the sensor element；And feedback circuit, which includes being located at two grades of amplifications
The 7th resistance between the first lead-out terminal of the anti-phase output terminal and the sensor element of device and it is located at described two grades and puts
Big the 8th resistance between the non-inverted output terminal of device and the second lead-out terminal of the sensor element.
The utility model has the advantages that：It is simple to operate, convenient use；The dew cell is connected with wiring board, and with institute
State internal layer encapsulating compound to be integrally formed, then in the internal layer encapsulating compound outer cladding outer layer encapsulating compound, finally metal shell is coated on
The outer layer encapsulating compound, by internal layer filter paper and outer filter paper on dew cell, so as to will be the dew cell complete
Cladding is got up so that the humidity sensor has dust-proof, waterproof and low temperature resistant effect.
Description of the drawings
This utility model is described in detail with reference to embodiment and accompanying drawing, wherein：
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the dew cell in Fig. 1.
Fig. 3 is the circuit diagram of the wiring board in Fig. 1.
Specific embodiment
Specific embodiment of the present utility model is expanded on further below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of humidity sensor, including wiring board 9, dew cell 8, internal layer encapsulating compound 7, internal layer filter paper
5th, outer layer encapsulating compound 3, metal shell 2 and outer filter paper 1.The dew cell 8 is on the wiring board 9, described interior
Layer encapsulating compound 7 is coated on the wiring board 9, and makes the dew cell 8 be revealed in the internal layer encapsulating compound 7, and the circuit
Plate 9 is integrally formed with the internal layer encapsulating compound 7, be that is to say and is adopted injection mo(u)lding.The internal layer filter paper 5 adheres on the wet sensitive
On element 8.Wherein, multiple projections (illustrating, non-label) are provided with above the internal layer encapsulating compound 7, for facilitating injection molding
Shi Jinhang is positioned.The outer layer encapsulating compound 3 is coated on the internal layer encapsulating compound 7, and it is described outer to be revealed in the dew cell 8
Layer encapsulating compound 3, wherein, the outer layer encapsulating compound 3 is integrally formed with the internal layer encapsulating compound 7.The metal shell 2 is coated on institute
Outer layer encapsulating compound 3 is stated, wherein, the metal shell 2 is stainless steel casing, and the metal shell 2 is provided with a perforate (schemes
Show, non-label), the dew cell 8 is located at the underface of the perforate, and the outer filter paper 1 adheres on the perforate
At opening, and it is located above the internal layer filter paper 5.
Waterproof grommet 6 is provided with the outside of the acquisition port of the dew cell 8, the internal layer encapsulating compound 7 is provided with two-layer ring
Shape fin, between two-layer ring-like ribs, the dew cell 8 is in the ring-like ribs for the waterproof grommet 6
Heart position.The waterproof grommet 6 is also folded between the outer layer encapsulating compound 3 and the metal shell 2 simultaneously.The humidity
Sensor also has two metal canulas 4, and two metal canulas 4 penetrate the wiring board 9, the internal layer encapsulating compound 7, institute simultaneously
Outer layer encapsulating compound 3 and the metal shell 2 are stated, two metal sleeves are symmetricly set in the both sides of the wiring board 9, and
It is integrally formed with the internal layer encapsulating compound 7, that is to say and adopt injection mo(u)lding, for by the wiring board 9, the internal layer encapsulating compound
7th, the outer layer encapsulating compound 3 and the metal shell 2 are connected.The bottom of the outer layer encapsulating compound 3 is provided with foam-rubber cushion 10,
For increasing cushioning effect.Multiple PVC wires 12 are connected with the wiring board 9, the PVC wires 12 and the metal shell 2
The position of contact is arranged with waterproof coil 11, for preventing water from entering wiring board 9, so as to ensure that the normal work of dew cell 8
Make.
As shown in Fig. 2 dew cell include dew cell substrate 801, be arranged on it is wet on the dew cell substrate 801
Quick element electrode and the hydrophilic low-resistance humidity-sensitive film 805 being successively set on the dew cell electrode and hydrophobic high resistance sense are wet
Thin film 806, the hydrophilic low-resistance humidity-sensitive film 805 and the hydrophobic high resistant humidity-sensitive film 806 are existed by heat cross-linking process combining
Together；The dew cell electrode includes a pair interdigital carbon electrodes 802, a pair of silver paste conductiving points 803 and a pair of Y type leads
804, the dew cell substrate 801 is alumina ceramic substrate.
As shown in figure 3, wiring board 9 includes a sensor circuit, and the sensor circuit senses device element S1, using as
First stage amplifier C1 that the differential output signal (sensor signal) of the current signal of sensor element S1 amplifies in advance, will amplify
Sensor signal amplify two-stage amplifier A1, produce electricity for sensor element driving current is remained constant constant pressure
Road C2, feedback signal is returned adjusting the feedback circuit C3 of amplification.Here, flow through the major part of the electric current of first stage amplifier C1
As sensor element S1 bias current and flows through sensor element S1.Sensor element S1 is electric by resistance value identical four
Resistance R33～R36 constitutes bridge-type.Additionally, sensor element S1 is the element of the equivalent resistance for showing as four bridge-types.Put in one-level
In big device C1, the grid of nmos pass transistor M11 and drain electrode are connected to node N13, source electrode by the resistance R11 that is connected in series～
R12 is connected to ground terminal.Constant-current source I 1 is located between power supply terminal and node N13.The grid of nmos pass transistor M21 and
Drain electrode is connected to node N23, and source electrode is connected to ground terminal by the resistance R21～R22 being connected in series.Constant-current source I2 is located at electricity
Between source terminal and node N23.The grid of nmos pass transistor M12 is connected to node N13, and source electrode is connected to node N31, and drain electrode is logical
Cross resistance R31 and be connected to power supply terminal.The grid of nmos pass transistor M22 is connected to node N23, and source electrode is connected to node N31, leakage
Pole is connected to power supply terminal by resistance R32.Node N331 is the junction point with the drain electrode of nmos pass transistor M12.Node N332
It is the junction point with the drain electrode of nmos pass transistor M22.Node N11 is the source electrode of nmos pass transistor M11.Node N21 is NMOS brilliant
The source electrode of body pipe M21.
The non-inverting input terminal of two-stage amplifier A1 is connected to node N332, and reversed input terminal is connected to node
N331, non-inverted output terminal are connected to the non-inverted output terminal N02 of sensor circuit, and anti-phase output terminal is connected to sensing
The anti-phase output terminal N01 of device circuit.Additionally, the outputting common voltage feedback terminal of two-stage amplifier A1 is connected to as sensing
The node N31 of the supply node of device element drives electric current.The outputting common voltage input terminal of two-stage amplifier A1 is connected to work
For the node N41 of the supply node of the outputting common voltage of two-stage amplifier A1.
In constantvoltage generation circuit C2, the grid of nmos pass transistor M41 and drain electrode are connected to node N43, and source electrode passes through
Resistance R41～the R42 being connected in series is connected to ground terminal.Constant-current source I4 is located between power supply terminal and node N43.Node
N41 is the source electrode of nmos pass transistor M41.
In feedback circuit C3, resistance 13 is located between the anti-phase output terminal N01 of sensor circuit and node N12, electricity
Resistance 23 is located between the non-inverted output terminal N02 of sensor circuit and node N22.Here, constant-current source I1～I2 flows through identical
Constant current.Nmos pass transistor M11 and nmos pass transistor M21 are same sizes.Nmos pass transistor M12 and nmos pass transistor M22 are
Same size.Resistance R11～R13 and resistance R21～R23 and resistance R41～R42 is identical material with sensor element S1.
The resistance value of resistance R11～R12 and resistance R21～R22 is identical.The resistance value of resistance R41～R42 is identical.Sensor element
The current signal of S1 changes.Therefore, the voltage of node NO1～NO2 does not change, not with temperature dependency.Then, it is not necessary to repair
Just temperature dependent temperature-compensation circuit.In sensor circuit, circuit scale diminishes, and consumes electric current and tails off.
The one-level that the differential output signal of the current signal as sensor element is amplified by this utility model in advance is amplified
It is device, the two-stage amplifier that the differential output signal of amplification is amplified, constant for sensor element driving current is remained
Constantvoltage generation circuit and feedback signal is returned adjusting the feedback circuit of amplification.One-level amplification is flow through in the sensor circuit
The bias current mostly as sensor element of the electric current of device.By sensor of the invention circuit, because passing through one-level
The sensor signal that amplifier is exaggerated is input to two-stage amplifier, thus sensor circuit can at a high speed and high amplification put
Large sensor signal.Even if the additional first stage amplifier of sensor circuit, the major part of the consumption electric current of first stage amplifier is also served as
Sensor element driving current utilizing, so the consumption electric current of sensor circuit hardly increases.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (4)
1. a kind of humidity sensor, it is characterised in that including wiring board, dew cell, internal layer encapsulating compound, internal layer filter paper, outer
Layer encapsulating compound, metal shell and outer filter paper；
On the wiring board, the internal layer encapsulating compound is coated on the wiring board to the dew cell, and makes the wet sensitive
Element is revealed in the internal layer encapsulating compound, and the internal layer filter paper is adhered on the dew cell；
The outer layer encapsulating compound is coated on the internal layer encapsulating compound, and makes the dew cell be revealed in the outer layer encapsulating compound：
The metal shell is coated on the outer layer encapsulating compound, and the metal shell is provided with a perforate, the dew cell position
In the underface of the perforate, the outer filter paper is adhered at the opening of the perforate, and is located at the internal layer filter paper
Top；
Described dew cell includes dew cell substrate and the dew cell electrode being arranged on the dew cell substrate, also
It is including the hydrophilic low-resistance humidity-sensitive film and hydrophobic high resistant humidity-sensitive film that are successively set on the dew cell electrode, described hydrophilic
Low-resistance humidity-sensitive film is the hydrophilic low-resistance humidity-sensitive film by obtained in chlorination quaternized ammonium, and the hydrophobic high resistant humidity-sensitive film is by silicon
Hydrophobic high resistant humidity-sensitive film obtained in alkane quaternary ammonium salt, the hydrophilic low-resistance humidity-sensitive film and the hydrophobic high resistant humidity-sensitive film pass through
Heat cross-linking process combining is together；Two metal sleeves are symmetricly set in the both sides of the wiring board, and with the internal layer
Encapsulating compound is integrally formed, and the wiring board includes a sensor circuit, and the sensor circuit include first input end,
Two input terminals, first lead-out terminal, the second lead-out terminal, amplify the sensor element generation that four bridge-type equivalent resistances are constituted
Voltage and export, the sensor circuit also includes：
First stage amplifier, which includes：The first constant-current source being connected in series between power supply terminal and ground terminal and a MOS are brilliant
Body pipe and first and second resistance, the second constant-current source being connected in series between the power supply terminal and the ground terminal and
Second MOS transistor and the 3rd and the 4th resistance, in the power supply terminal and the first input end of the sensor element
Between the first resistor composition that is connected in series and current mirror be connected to first MOS transistor the 3rd MOS transistor and
The second resistance composition being connected in series between the first input end of the power supply terminal and the sensor element and electric current
Mirror is connected to the 4th MOS transistor of second MOS transistor, and the junction point of first and second resistance is connected to described
The first lead-out terminal of sensor element, the junction point of the 3rd and the 4th resistance are connected to the second of the sensor element
Lead-out terminal；
Constantvoltage generation circuit, which is included in the 3rd constant-current source and the 5th MOS being connected in series between power supply terminal and ground terminal
Transistor and the 5th and the 6th resistance, the constantvoltage generation circuit produce constant pressure；
Two-stage amplifier, its reversed input terminal are connected to the drain electrode of the 3rd MOS transistor, non-inverting input terminal connection
To the drain electrode of the 4th MOS transistor, anti-phase output terminal is connected to the anti-phase output terminal of the sensor circuit, non-anti-
Phase output terminals are connected to the non-inverted output terminal of the sensor circuit, are input into described in outputting common voltage input terminal
Constant pressure, is input into the voltage of the first input end of the sensor element in outputting common voltage feedback terminal；And feedback electricity
Road, which is included between the first lead-out terminal of the anti-phase output terminal and sensor element for being located at the two-stage amplifier
7th resistance and be located at the two-stage amplifier non-inverted output terminal and the sensor element the second lead-out terminal it
Between the 8th resistance.
2. humidity sensor as claimed in claim 1, it is characterised in that：The wiring board and internal layer encapsulating compound one into
Type, the outer layer encapsulating compound are integrally formed with the internal layer encapsulating compound.
3. humidity sensor as claimed in claim 2, it is characterised in that：Two metal canulas penetrate simultaneously the wiring board,
The internal layer encapsulating compound, the outer layer encapsulating compound and the metal shell.
4. humidity sensor as claimed in claim 3, it is characterised in that：Waterproof is provided with the outside of the acquisition port of the dew cell
Sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520924356.4U CN206057233U (en) | 2015-11-19 | 2015-11-19 | A kind of humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520924356.4U CN206057233U (en) | 2015-11-19 | 2015-11-19 | A kind of humidity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206057233U true CN206057233U (en) | 2017-03-29 |
Family
ID=58371499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520924356.4U Expired - Fee Related CN206057233U (en) | 2015-11-19 | 2015-11-19 | A kind of humidity sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206057233U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713587A (en) * | 2019-01-17 | 2019-05-03 | 浙江江山华宁电器有限公司 | A kind of automatic dehumidifying power transformation box |
| CN111610133A (en) * | 2020-06-19 | 2020-09-01 | 中建路桥集团有限公司 | Automatic test device for concrete impermeability |
-
2015
- 2015-11-19 CN CN201520924356.4U patent/CN206057233U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713587A (en) * | 2019-01-17 | 2019-05-03 | 浙江江山华宁电器有限公司 | A kind of automatic dehumidifying power transformation box |
| CN111610133A (en) * | 2020-06-19 | 2020-09-01 | 中建路桥集团有限公司 | Automatic test device for concrete impermeability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170329 Termination date: 20171119 |