CN109613073A - A kind of novel pressure and humidity sensor reading circuit - Google Patents
A kind of novel pressure and humidity sensor reading circuit Download PDFInfo
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- CN109613073A CN109613073A CN201811268110.0A CN201811268110A CN109613073A CN 109613073 A CN109613073 A CN 109613073A CN 201811268110 A CN201811268110 A CN 201811268110A CN 109613073 A CN109613073 A CN 109613073A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/228—Circuits therefor
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- General Health & Medical Sciences (AREA)
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- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of novel pressures and humidity sensor reading circuit, including piezo-resistive bridge unit (10), humicap interface circuit unit (30), signal pulsewidth modulation processing circuit (20) and signal modulation process circuit (40), piezo-resistive bridge unit (10) the connection signal pulsewidth modulation processing circuit (20), signal pulsewidth modulation processing circuit (20) and humicap interface circuit unit (30) are all connected with signal modulation process circuit (40)；The sensitive signal of pressure sensor and humidity sensor is converted and synthesized unified signal, realize the fusion of signal and is efficiently utilized, noise jamming is avoided and is conducive to transmit at a distance.
Description
Technical field
The present invention relates to the fields such as sensor technology, are that a kind of novel pressure and humidity sensor read electricity specifically
Road.
Background technique
Sensor finds out the feeler of nature information as the mankind, the various non electrical quantity information that people can be needed to find out by it
It is converted to measurable information about power, recognize for people and controls corresponding object condition and foundation is provided.With modern surveying, control
The continuous development of system and automatic technology, sensor technology has been increasingly concerned by people, with the communication technology and computer skill
Art constitutes three big pillars of modern information industry, is the important foundation of information industry, it is measuring technique, semiconductor technology, meter
Numerous subject phases such as calculation machine technology, the information processing technology, microelectronics, optics, acoustics, precision machinery, bionics and materialogy
One of comprehensive cutting edge technology mutually intersected is the commanding elevation that 21 century people fight in terms of hi-tech development.
Capacitive moisture sensor and resistor-type pressure sensor are a kind of important sensors in sensor family.Tradition
Sensor readout circuit by sensor signal by interface circuit convert, respectively read different sensors signal value.
Summary of the invention
It is an object of the invention to design a kind of novel pressure and humidity sensor reading circuit, by pressure sensor and
The sensitive signal of humidity sensor is converted and is synthesized unified signal, is realized the fusion of signal and is efficiently utilized, avoids making an uproar
Acoustic jamming and be conducive to transmit at a distance.
The present invention is achieved through the following technical solutions: a kind of novel pressure and humidity sensor reading circuit, including pressure-sensitive
Resistance bridge unit, humicap interface circuit unit, signal pulsewidth modulation processing circuit and signal modulation process circuit, it is described
Piezo-resistive bridge unit connection signal pulsewidth modulation processing circuit, signal pulsewidth modulation processing circuit and humicap interface electricity
Road unit is all connected with signal modulation process circuit.
Further is that the present invention is better achieved, and especially uses following set-up modes: the signal pulsewidth modulation processing
Circuit includes two instrument amplifiers, triangle wave generator, comparators, and one of instrument amplifier passes through triangle wave generator
It is connected with an input terminal of comparator, another instrument amplifier is connected with another input terminal of comparator, compares
The output end connection signal modulation treatment circuit of device.
It is further for the present invention is better achieved, especially use following set-up modes: the triangle wave generator with than
Inverting input terminal compared with device is connected.
Further is that the present invention is better achieved, and especially uses following set-up modes: being connected with triangle wave generator
Instrument amplifier output voltage it is directly proportional to temperature change, the output of the instrument amplifier being connected directly with comparator electricity
It presses directly proportional to pressure change.
Further is that the present invention is better achieved, and especially uses following set-up modes: the signal modulation process circuit
Including exporting the level translator that is connected with signal pulsewidth modulation processing circuit, and level translator also with humicap interface
The output of circuit unit is connected.
Further is that the present invention is better achieved, and especially uses following set-up modes: the signal pulsewidth modulation processing
The amplitude of circuit output signal is synchronous with the output of humicap interface circuit unit.
Further is that the present invention is better achieved, and especially uses following set-up modes: the humicap interface circuit
Unit includes switched-capacitor circuit and the humicap Cs being connected on switched-capacitor circuit.
Further is that the present invention is better achieved, and especially use following set-up modes: the switched-capacitor circuit uses
Basic integrating circuit structure.
Further is that the present invention is better achieved, and especially uses following set-up modes: the piezo-resistive bridge unit
Including constant-current source and varistor network, the input terminal phase of constant-current source and varistor network and signal pulsewidth modulation processing circuit
Connection, varistor network are connected with the input terminal of signal pulsewidth modulation processing circuit.
Further is that the present invention is better achieved, and especially use following set-up modes: varistor network includes two
Positive varistor and two negative sense varistors, and one end of positive varistor is connected with one end of negative sense varistor
Form looped network, the connects end altogether connection signal pulsewidth modulation processing that any three positive varistors are connected with negative sense varistor
The input terminal of circuit.
Compared with prior art, the present invention have the following advantages that and the utility model has the advantages that
(1) sensitive signal of pressure sensor and humidity sensor is converted and is synthesized unified signal by the present invention, real
The fusion of signal is showed and has efficiently utilized, has avoided noise jamming and be conducive to transmit at a distance.
(2) the present invention is based on pulse signal modulation principles realizes multisensor letter by completely new signal processing mode
Number fusion with efficiently utilize, more preferably avoid noise jamming and be conducive to signal and transmit at a distance, while being mentioned by pressure sensor
Taking-out temperature information realizes temp sensing function.
(3) present invention is converted by signal, and output signal is made to have a characteristic that output signal duty ratio and pressure change
Directly proportional to temperature signal at output signal frequency, output signal signal amplitude is directly proportional to relative humidity, realizes signal and melts
It closes.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention.
Wherein, 10- piezo-resistive bridge unit, 20- signal pulsewidth modulation processing circuit, 30- humicap interface circuit
Unit, 40- signal modulation process circuit.
Specific embodiment
The present invention is described in further detail below with reference to embodiment, embodiments of the present invention are not limited thereto.
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Embodiment 1:
The invention proposes a kind of novel pressures and humidity sensor reading circuit, by pressure sensor and humidity sensor
Sensitive signal converted and synthesized unified signal, realize the fusion of signal and efficiently utilize, avoid noise jamming and having
Conducive to remote transmission, as shown in Figure 1, especially using following set-up modes: including piezo-resistive bridge unit 10, humicap
Interface circuit unit 30, signal pulsewidth modulation processing circuit 20 and signal modulation process circuit 40, the piezo-resistive bridge list
First 10 connection signal pulsewidth modulation processing circuits 20, signal pulsewidth modulation processing circuit 20 and humicap interface circuit unit 30
All it is connected with signal modulation process circuit 40.
10 pairs of the piezo-resistive bridge unit extraneous pressure signals, which carry out detection, changes varistor resistance value, and exports
Voltage value Vb and Vo, Vb voltage value is directly proportional to temperature change, and Vo voltage value is directly proportional to pressure change.
The humicap interface circuit unit 20, which detects ambient humidity signal, changes its capacitance, output voltage values
Vc。
Embodiment 2:
The present embodiment is further optimized based on the above embodiments, as shown in Figure 1, further is preferably real
The existing present invention, especially use following set-up modes: the signal pulsewidth modulation processing circuit 20 includes two instrument amplifiers, three
Angle wave generator, comparator, one of instrument amplifier are connected by triangle wave generator with an input terminal of comparator
It connects, another instrument amplifier is connected with another input terminal of comparator, at the output end connection signal modulation of comparator
Manage circuit 40.
As the scheme that is preferable to provide, signal pulsewidth modulation processing circuit 20 includes (the instrument amplification of two instrument amplifiers
Device A and instrument amplifier B), triangle wave generator, comparator；Preferably, instrument amplifier A by triangle wave generator with than
An input terminal compared with device is connected, and instrument amplifier B is connected with another input terminal of comparator, the output end of comparator
Connection signal modulation treatment circuit 40.
Preferably, instrument amplifier A input bridge signal Vb, instrument amplifier B input bridge signal Vo, amplify through instrument
Output signal is VT after device A amplification, output signal is Vp after instrument amplifier B amplification, and VT is directly proportional to temperature change, Vp
It is directly proportional to pressure change；The VT signal of input is converted into frequency triangular wave directly proportional to VT by the triangle wave generator to be believed
Number, i.e., triangular wave frequency is directly proportional to temperature change, is output to one end (preferably inverting input terminal) of comparator；Comparator will be another
The Vp signal of one end (preferably non-inverting input terminal) input and the triangular signal of inverting input terminal input carry out signal modulation, output
The duty ratio square-wave signal Vcom directly proportional to pressure change, while Vcom signal frequency is directly proportional to temperature change.
Embodiment 3:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, and especially use following set-up modes: the triangle wave generator is connected with the inverting input terminal of comparator.
Embodiment 4:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, especially uses following set-up modes: the output voltage for the instrument amplifier being connected with triangle wave generator
Directly proportional to temperature change, the output voltage for the instrument amplifier being connected directly to comparator is directlyed proportional to pressure change.
Embodiment 5:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
Ground realize the present invention, especially use following set-up modes: the signal modulation process circuit 40 include at signal pulsewidth modulation
Reason circuit 20 exports the level translator being connected, and output phase of the level translator also with humicap interface circuit unit 30
Connection.
The signal modulation process circuit 40 include level shifting circuit, the level shifting circuit will input Vcom and Vc into
Row modulation, keeps square-wave signal amplitude synchronous with Vc, and final output it is expected Vout.
Embodiment 6:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
Ground realize the present invention, especially use following set-up modes: the amplitude of 20 output signal of signal pulsewidth modulation processing circuit with
The output of humicap interface circuit unit 30 is synchronous.
Embodiment 7:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, and especially use following set-up modes: the humicap interface circuit unit (30) includes switching capacity electricity
Road and the humicap Cs being connected on switched-capacitor circuit.
Embodiment 8:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, and especially use following set-up modes: the switched-capacitor circuit uses basic integrating circuit structure.
Embodiment 9:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, and especially use following set-up modes: the piezo-resistive bridge unit 10 includes constant-current source and varistor
Network, constant-current source are connected with the input terminal of varistor network and signal pulsewidth modulation processing circuit 20, varistor network
It is connected with the input terminal of signal pulsewidth modulation processing circuit 20.
As the scheme that is preferable to provide, piezo-resistive bridge unit 10 include constant-current source (Io) and varistor network (just
To varistor R1+, positive varistor R2+, negative sense varistor R1-, negative sense varistor R2- composition), constant-current source and pressure
Quick resistor network is connected with the input terminal of signal pulsewidth modulation processing circuit 20, at varistor network and signal pulsewidth modulation
The input terminal of reason circuit 20 is connected.
Embodiment 10:
The present embodiment is to advanced optimize based on any of the above embodiments, as shown in Figure 1, being further more preferable
The present invention is realized on ground, and especially use following set-up modes: varistor network includes two positive varistor (positive pressure-sensitive electricity
Hinder R1+, forward direction varistor R2+) and two negative sense varistors (negative sense varistor R1-, negative sense varistor R2-), and
One end of positive varistor is connected with one end of negative sense varistor forms looped network, any three positive varistors and negative
The input terminal for the connects end altogether connection signal pulsewidth modulation processing circuit 20 being connected to varistor.
As the scheme that is preferable to provide, positive varistor R1+ is GND with the connects end altogether of negative sense varistor R2-, positive
The connects end altogether of varistor R2+ and negative sense varistor R2- are V+, and positive varistor R2+ is connected with negative sense varistor R1-
Another input terminal of the anode of constant-current source (Io) and an input terminal of instrument amplifier A, instrument amplifier A connects Vref；
Positive varistor R1+, negative sense varistor R1- connects end altogether be V-；Positive varistor and negative sense varistor, resistance value
It varies with temperature；The capacitance of humicap Cs does not vary with temperature.
The switched-capacitor circuit uses basic integrating circuit structure；Instrument amplifier uses typical three instrument amplifier knot
Structure；Triangle wave generator uses voltage controlled oscillator structure；Comparator uses typical five pipes amplifier structure, increases input and output model
It encloses；Level shifting circuit is using simple unidirectional level conversion structure.
Embodiment 11:
The present embodiment be advanced optimize based on any of the above embodiments, as shown in Figure 1, a kind of novel pressure and
Humidity sensor reading circuit, including piezo-resistive bridge unit 10, humicap interface circuit unit 20, the varistor
Electric bridge unit 10 includes constant-current source (Io) and varistor network (positive varistor R1+, forward direction varistor R2+) and two
Negative sense varistor (negative sense varistor R1-, negative sense varistor R2- are constituted)；The piezo-resistive bridge unit 10 is externally
Boundary's pressure signal, which carries out detection, changes varistor resistance value, and output voltage values Vb and Vo, Vb voltage value and temperature change at
Direct ratio, Vo voltage value are directly proportional to pressure change.The humicap interface circuit unit 20 includes humicap Cs and switch
Condenser network；The humicap detection ambient humidity signal changes its capacitance, output voltage values Vc.
The novel pressure and humidity sensor reading circuit further include signal pulsewidth modulation processing circuit 20 and signal tune
Processing circuit 40 processed；
The signal pulsewidth modulation processing circuit 20 includes instrument amplifier (instrument amplifier A and instrument amplifier B), three
Angle wave generator, comparator, in which: instrument amplifier A input bridge signal Vb, instrument amplifier B input bridge signal Vo, warp
Output signal is VT after instrument amplifier A amplification, output signal is Vp after instrument amplifier B amplification, and VT and temperature change
Directly proportional, Vp is directly proportional to pressure change；It is directly proportional to VT that the VT signal of input is converted into frequency by the triangle wave generator
Triangular signal, i.e. triangular wave frequency are directly proportional to temperature change, are output to the inverting input terminal of comparator；Comparator is by same phase
The Vp signal of input terminal input and the triangular signal of inverting input terminal input carry out signal modulation, and output duty cycle and pressure become
It is melted into the square-wave signal Vcom of direct ratio, while Vcom signal frequency is directly proportional to temperature change.
The signal modulation process circuit 40 include level shifting circuit, the level shifting circuit will input Vcom and Vc into
Row modulation, keeps square-wave signal amplitude synchronous with Vc, and final output it is expected Vout.
The working principle of the pressure and humidity sensor reading circuit are as follows:
Pressure sensor is divided into positive varistor (positive varistor R1+, forward direction varistor R2+) its resistance value are as follows: R
+=R+ Δ RP+ΔRTWith negative sense varistor (negative sense varistor R1-, negative sense varistor R2- are constituted), resistance value are as follows: R+
=R- Δ RP+ΔRT, wherein R is varistor initial value, Δ RPFor change in resistance amount caused by ambient pressure, Δ RTFor temperature
Caused change in resistance amount.In piezo-resistive bridge unit 10, current source (constant-current source Io) is electric bridge power supply, then electric bridge exports
Signal VB=IO·(R+ΔRT)VO=IO·ΔRP, then Vb voltage value is directly proportional to temperature change, Vo voltage value and pressure change
It is directly proportional, realize sensitive signal extraction.The two signals are passed through into instrument amplifier (instrument amplifier A, instrument amplifier B)
It amplifies and exports VT, Vp and its proportionate relationship is then constant, is i.e. VT is directly proportional to temperature change, and Vp is directly proportional to pressure change.
Signal processing is carried out to two signals again, i.e., VT signal is converted into frequency and VT at just with voltage-controlled triangle wave generator
Than triangular signal, while it being based on pulse width modulation principle, by the triangular wave and Vp input comparator, generates duty ratio and Vp
Directly proportional square-wave signal.By pulse width modulation principle it is found that Vcom duty ratio is directly proportional to Vp, frequency and VT are at just
Than the duty ratio of i.e. Vcom signal is directly proportional to pressure change, and frequency is directly proportional to temperature change, realizes signal processing and melts
It closes.
Humicap Cs is capacitance signal simultaneously, after basic switched-capacitor circuit processing, obtains output signal Vc
It is directly proportional to capacitance variations, by the signal and Vcom signal integration, using level conversion technology, allow the amplitude and Vc of Vcom signal
It is identical, generate final output Vout signal.So far Vout signal has duty ratio directly proportional to pressure change, and frequency and temperature become
It is melted into direct ratio, amplitude is directly proportional to capacitance variations, and an output signal includes three semaphores, realizes that sensor signal detects function
Energy.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to
According to technical spirit any simple modification to the above embodiments of the invention, equivalent variations, protection of the invention is each fallen within
Within the scope of.
Claims (10)
1. a kind of novel pressure and humidity sensor reading circuit, it is characterised in that: including piezo-resistive bridge unit (10), wet
Quick capacitive interface circuit unit (30), signal pulsewidth modulation processing circuit (20) and signal modulation process circuit (40), the pressure
Quick resistance bridge unit (10) connection signal pulsewidth modulation processing circuit (20), signal pulsewidth modulation processing circuit (20) and wet sensitive
Capacitive interface circuit unit (30) is all connected with signal modulation process circuit (40).
2. a kind of novel pressure according to claim 1 and humidity sensor reading circuit, it is characterised in that: the signal
Pulsewidth modulation processing circuit (20) includes two instrument amplifiers, triangle wave generator, comparators, one of instrument amplifier
It is connected by triangle wave generator with an input terminal of comparator, another of another instrument amplifier and comparator are defeated
Enter end to be connected, the output end connection signal modulation treatment circuit (40) of comparator.
3. a kind of novel pressure according to claim 2 and humidity sensor reading circuit, it is characterised in that: the triangle
Wave generator is connected with the inverting input terminal of comparator.
4. a kind of novel pressure according to claim 2 and humidity sensor reading circuit, it is characterised in that: with triangular wave
The output voltage for the instrument amplifier that generator is connected is directly proportional to temperature change, puts with the instrument that comparator is connected directly
The output voltage of big device is directly proportional to pressure change.
5. a kind of novel pressure according to claim 1-4 and humidity sensor reading circuit, it is characterised in that:
The signal modulation process circuit (40) includes exporting the level translator being connected with signal pulsewidth modulation processing circuit (20),
And level translator is also connected with the output of humicap interface circuit unit (30).
6. a kind of novel pressure according to claim 5 and humidity sensor reading circuit, it is characterised in that: the signal
The amplitude of pulsewidth modulation processing circuit (20) output signal is synchronous with the output of humicap interface circuit unit (30).
7. according to claim 1-4, a kind of 6 described in any item novel pressures and humidity sensor reading circuit, feature exist
In: the humicap interface circuit unit (30) includes switched-capacitor circuit and the wet sensitive being connected on switched-capacitor circuit electricity
Hold Cs.
8. a kind of novel pressure according to claim 7 and humidity sensor reading circuit, it is characterised in that: the switch
Condenser network uses basic integrating circuit structure.
9. according to claim 1-4, a kind of 6,8 described in any item novel pressures and humidity sensor reading circuit, feature
Be: the piezo-resistive bridge unit (10) includes constant-current source and varistor network, constant-current source and varistor network and
The input terminal of signal pulsewidth modulation processing circuit (20) is connected, varistor network and signal pulsewidth modulation processing circuit (20)
Input terminal be connected.
10. a kind of novel pressure according to claim 9 and humidity sensor reading circuit, it is characterised in that: pressure-sensitive electricity
It hinders network and includes two positive varistors and two negative sense varistors, and one end of positive varistor and the pressure-sensitive electricity of negative sense
One end of resistance, which is connected, forms looped network, the connects end altogether connection letter that any three positive varistors are connected with negative sense varistor
It feels the pulse the input terminal of wide modulation treatment circuit (20).
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| CN201811268110.0A CN109613073A (en) | 2018-10-29 | 2018-10-29 | A kind of novel pressure and humidity sensor reading circuit |
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