CN105067679B - Air humidity indicating circuit - Google Patents
Air humidity indicating circuit Download PDFInfo
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- CN105067679B CN105067679B CN201510464356.5A CN201510464356A CN105067679B CN 105067679 B CN105067679 B CN 105067679B CN 201510464356 A CN201510464356 A CN 201510464356A CN 105067679 B CN105067679 B CN 105067679B
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Abstract
This patent application discloses a kind of air humidity indicating circuit, belong to test circuit field.Air humidity indicating circuit, including humidity measuring circuit, signal amplification circuit, impedance inverter circuit and display circuit；First output end of humidity measuring circuit connects the first input end of impedance inverter circuit；Second output end of humidity measuring circuit connects the second input of signal amplification circuit；3rd output end of humidity measuring circuit connects the 3rd input of signal amplification circuit；4th output end of signal amplification circuit connects the 4th input of display circuit；5th output end of impedance inverter circuit connects the 5th input of display circuit.
Description
Technical field
The present invention relates to test circuit field, and in particular to a kind of air humidity indicating circuit.
Background technology
Air humidity is one of important parameter of air quality.Air humidity is too small, then air is very dry.Too dry
Air easily makes the skin of people to tight or even itch.Meanwhile, air excessively drying is easy to cause fire incident.And air is wet
Spend greatly, then air is extremely moistened, and easily makes one long eczema.Make the body moisture of people too heavy, be chronically at the ring of heavy with moistures
Border easilys lead to various skin diseases.And moist environment contributes to the growth of various bacteriums, increases the bacterium in environment,
Make disease multiple, and article is difficult storage, easily addles.Therefore the air only in certain humidity range is just conducive to people
Existence, it is quite necessary to the humidity in present air is monitored, it is corresponding to be taken when air humidity is changed
Measure prevent this change to be possible to the adverse consequences brought.
But, the equipment of monitoring air humidity is all fairly expensive at present, it is impossible to promoted in average family, therefore anxious
The air humidity instruction equipment for needing a kind of cheap function single, and the present invention exactly applies to the air humidity of this kind of equipment
Indicating circuit.
The content of the invention
The present invention provides a kind of air humidity indicating circuit, is all quite held high with the equipment for solving monitoring air humidity at present
It is expensive, it is impossible to the problem of being promoted in average family.
To solve problem above, using following scheme：
Scheme one：Air humidity indicating circuit, including humidity measuring circuit, signal amplification circuit, impedance inverter circuit and
Display circuit；First output end of humidity measuring circuit connects the first input end of impedance inverter circuit；Humidity measuring circuit
Second output end connects the second input of signal amplification circuit；The 3rd output end connection signal amplification electricity of humidity measuring circuit
3rd input on road；4th output end of signal amplification circuit connects the 4th input of display circuit；Impedance inverter circuit
The 5th output end connect display circuit the 5th input；The humidity measuring circuit includes operational amplifier IC1 and computing
Amplifier IC1 in-phase input end inductance L1 and resistance R7 in parallel；Operational amplifier IC1 inverting input concatenation operation is put
Big device IC1 output end formation negative-feedback；Operational amplifier IC1 output end connects the 3rd output end of humidity measuring circuit；
Inductance L1 connection adjustable resistances RP1 adjustable end；Humistor R2, resistance R3, humistor R4 and resistance R5 connect what is formed
Branch road is in parallel with adjustable resistance RP1 and voltage-regulator diode D1 three；Voltage-regulator diode D1 negative electrode connects the first output end and passed through
Cross the positive voltage terminal that resistance R1 connections are provided by power supply group；Voltage-regulator diode D1 anode connection resistance R6；Resistance R3 and resistance
The second output end is coupled between R4.
Operation principle：
Humidity measuring circuit will sense and receive moisture signal, and behind moisture signal is converted into passing to after electric signal
Signal amplification circuit.Signal amplification circuit receives the signal passed over from humidity measuring circuit, after processing amplification
Pass the signal along in display circuit and show.Impedance inverter circuit receive transmitted from humidity measuring circuit come letter
After number, signal is handled, stable working environment is provided for display circuit.
Beneficial effect：
1. the present invention is simple in construction, component used is less, effectively reduces production cost, suitable for entering in average family
Row is promoted.
2. humidity measuring circuit connects impedance conversion electricity by the first output end, the second output end and the 3rd output end respectively
Road and signal amplification circuit, while conveniently by signal special delivery to signal amplification circuit, are delivered to impedance by stable voltage and turn
Change in circuit, facilitate impedance inverter circuit to provide stable reference voltage for display circuit.
3. the signal after amplification is delivered in display circuit by signal amplification circuit by the 4th delivery outlet, convenient display electricity
Road can obtain clearly signal and accurately show.
4. humidity measuring circuit includes operational amplifier IC1, the electricity in parallel with operational amplifier IC1 in-phase input end
Feel L1 and resistance R7；Operational amplifier IC1 inverting input concatenation operation amplifier IC1 output end formation negative-feedback；Fortune
The output end for calculating amplifier IC1 connects the 3rd output end of humidity measuring circuit；Inductance L1 connection adjustable resistances RP1's is adjustable
End；Humistor R2, resistance R3, humistor R4 and resistance R5 connect the branch road to be formed and adjustable resistance RP1 and the pole of voltage stabilizing two
Pipe D1 three is in parallel；Voltage-regulator diode D1 negative electrode connects the first output end and provided just by power supply group by resistance R1 connections
Voltage end；Voltage-regulator diode D1 anode connection resistance R6；The second output end is coupled between resistance R3 adjustable resistances R4；Facilitate voltage stabilizing
The mu balanced circuit of diode D1, resistance R1 and resistance R6 compositions provides stable voltage for whole air humidity indicating circuit；Side
Just humistor R2 and humistor R4 sensings detect the moisture signal in air and moisture signal are converted into electric signal, lead to
Signal amplification circuit is passed to after the buffering for crossing operational amplifier IC1.
Scheme two：On the basis of scheme one further, signal amplification circuit includes operational amplifier IC2 and operation amplifier
Device IC3；Operational amplifier IC2 in-phase input end connects the 3rd input；Operational amplifier IC2 inverting input passes through electricity
Feel L2 the second inputs of connection, resistance R8 is coupled between the second input and inductance L2；In operational amplifier IC2 positive feedback
It is in series with electric capacity C1 and adjustable resistance RP2；Operational amplifier IC2 output end passes through resistance R9 concatenation operation amplifiers IC3's
In-phase input end, operational amplifier IC3 inverting input concatenation operation amplifier IC3 output end and the 4th output end；Have
Beneficial to receive transmitted from humidity measuring circuit come signal after in time be filtered by inductance L2 and resistance R8 after by
Operational amplifier IC2 is amplified, and then passes to display circuit after operational amplifier IC3 buffering.
Scheme three：On the basis of scheme one further, the adjustable resistance RP3 of impedance inverter circuit one end connection first
Input, adjustable resistance RP3 other end ground connection, adjustable resistance RP3 adjustable end concatenation operation amplifier IC4 homophase input
End, operational amplifier IC4 inverting input concatenation operation amplifier IC4 output end and the 5th output end；It is easy to impedance to become
Change circuit and receive the burning voltage come from humidity measuring circuit transmission, stable ginseng is provided after being converted through impedance for display circuit
Examine voltage.
Scheme four：On the basis of scheme one further, the electric capacity C2 of display circuit one end connect the 5th input and
Voltmeter U1 anode, the electric capacity C2 other end connects the 4th input and voltmeter U1 negative electrode；Display circuit is by receiving
The signal that the burning voltage and signal amplification circuit that impedance inverter circuit is provided are passed over, is directly used after electric capacity C2 filtering
Voltmeter U1 shown, is conducive to simplifying structure cost-effective.
Brief description of the drawings
Fig. 1 is the circuit diagram of the humidity measuring circuit of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the signal amplification circuit of the embodiment of the present invention；
Fig. 3 is the circuit diagram of the impedance inverter circuit of the embodiment of the present invention；
Fig. 4 is the circuit diagram of the display circuit of the embodiment of the present invention.
Embodiment
Below by embodiment, the present invention is further detailed explanation：
Reference in Figure of description includes：Resistance R1, humistor R2, resistance R3, humistor R4, resistance
R5, resistance R6, resistance R7, resistance R8, resistance R9, variable resistor RP1, variable resistor RP2, variable resistor RP3, inductance L1, electricity
Feel L2, operational amplifier IC1, operational amplifier IC2, operational amplifier IC3, operational amplifier IC4, electric capacity C1, electric capacity C2, electricity
Press table U1, voltage-regulator diode D1.
Air humidity indicating circuit, including humidity measuring circuit, signal amplification circuit, impedance inverter circuit and display electricity
Road；First output end of humidity measuring circuit connects the first input end of impedance inverter circuit；The second of humidity measuring circuit is defeated
Go out the second input of end connection signal amplification circuit；The of the 3rd output end connection signal amplification circuit of humidity measuring circuit
Three inputs；4th output end of signal amplification circuit connects the 4th input of display circuit；The 5th of impedance inverter circuit
Output end connects the 5th input of display circuit.
As shown in figure 1, the positive voltage that one end connection of the resistance R1 in humidity measuring circuit is provided by power supply group, resistance R1
Other end connection voltage-regulator diode D1 negative electrode, humistor R2 one end and adjustable resistance RP1 one end, resistance R1's should
First output end of end connection humidity measuring circuit；Voltage-regulator diode D1 anode connection resistance R6 one end, the one of resistance R5
End and the adjustable resistance RP1 other end；Resistance R6 other end ground connection；The one of resistance R5 other end connection humistor R4
The of end, humistor R4 other end connection resistance R3 one end and humistor R4 end connection humidity measuring circuit
Two output ends；The resistance R3 other end connection humistor R2 other end；Adjustable resistance RP1 adjustable end connection inductance L1's
One end, inductance L1 other end connection resistance R7 one end and operational amplifier IC1 in-phase input end；The resistance R7 other end
Ground connection；Operational amplifier IC1 inverting input concatenation operation amplifier IC1 output end and ground connection；Operational amplifier IC1's
Output end connects the 3rd output end of humidity measuring circuit.
Humistor R2, resistance R3, humistor R4 and resistance R5 composition four arm electrical bridges, due to humistor R2 and wet sensitive
Resistance R4 nonlinear characteristic, humistor R2 and humistor R4 in bridge arm connected respectively resistance R3 and resistance R5 come
Compensate.Adjustable resistance RP1 is divided into the two-arm of four arm electrical bridge by adjustable resistance RP1 adjustable end, while after voltage is split
Transmit to operational amplifier IC1 in-phase input end, signal is after operational amplifier IC1 buffering from the second output end and
Three output ends pass the signal along to signal amplification circuit.
Resistance R1 and resistance R6 constitutes voltage stabilizing electricity as voltage-regulator diode D1 current-limiting resistance together with voltage-regulator diode D1
Source, it is ensured that the stability and accuracy of bridge-operative.
As shown in Fig. 2 the resistance R8 of signal amplification circuit one end connects the second input and inductance L2 one end, resistance
R8 other end ground connection；Inductance L2 other end concatenation operation amplifier IC2 inverting input；Operational amplifier IC2's is same
Phase input connects the 3rd input and electric capacity C1 one end, and electric capacity C1 other end connection adjustable resistance RP2 one end is adjustable
The resistance RP2 other end and adjustable end are all connected with operational amplifier IC2 output end and resistance R9 one end, and resistance R9's is another
Concatenation operation amplifier IC3 in-phase input end is held, operational amplifier IC3 inverting input concatenation operation amplifier IC3's
Output end and the 4th output end.
Signal amplification circuit receives transmit to come from humidity measuring circuit from the second input and the 3rd input
After signal, operational amplifier IC2 is amplified to signal, and operational amplifier IC3 enters the signal after amplification after row buffering from
Four output ends are exported to impedance inverter circuit.Signal amplification circuit will be produced between humistor R2 and humistor R4 because of the temperature difference
Raw unbalanced to ground signal is exaggerated, and output signal again will after the buffering of the voltage follower of operational amplifier IC3 formation
Signal output is to display circuit.Inductance L2 and resistance R8 strobe.
As shown in figure 3, the adjustable resistance RP3 of impedance inverter circuit one end connection first input end, adjustable resistance RP3's
The other end is grounded, adjustable resistance RP3 adjustable end concatenation operation amplifier IC4 in-phase input end, and operational amplifier IC4's is anti-
Phase input concatenation operation amplifier IC4 output end and the 5th output end.
Impedance inverter circuit is steady after stable through voltage-regulator diode D1 by the first output end output of humidity measuring circuit
Determine voltage, operational amplifier IC4 in-phase input end is input to by adjustable resistance RP3 partial pressure, by operational amplifier IC4
Impedance conversion, to display circuit provide a stable reference voltage.
As shown in figure 4, the electric capacity C2 of display circuit one end connects the 5th input and voltmeter U1 anode, electric capacity C2
The other end connect the 4th input and voltmeter U1 negative electrode.
Above-described is only that the known general knowledge such as concrete structure and characteristic is not made herein in embodiments of the invention, scheme
Excessive description., without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these should also be considered as protection scope of the present invention, these are implemented all without the influence present invention
Effect and practical applicability.
Claims (2)
1. air humidity indicating circuit, it is characterised in that：Including humidity measuring circuit, signal amplification circuit, impedance inverter circuit
And display circuit；First output end of humidity measuring circuit connects the first input end of impedance inverter circuit；Humidity measuring circuit
The second output end connect signal amplification circuit the second input；The 3rd output end connection signal amplification of humidity measuring circuit
3rd input of circuit；4th output end of signal amplification circuit connects the 4th input of display circuit；Impedance conversion electricity
5th output end on road connects the 5th input of display circuit；The humidity measuring circuit includes operational amplifier IC1, with transporting
Calculate amplifier IC1 in-phase input end inductance L1 and resistance R7 in parallel；Operational amplifier IC1 inverting input concatenation operation
Amplifier IC1 output end formation negative-feedback；3rd output of operational amplifier IC1 output end connection humidity measuring circuit
End；Inductance L1 connection adjustable resistances RP1 adjustable end；Humistor R2, resistance R3, humistor R4 and resistance R5 connect to be formed
Branch road it is in parallel with adjustable resistance RP1 and voltage-regulator diode D1 three；Voltage-regulator diode D1 negative electrode connects the first output end simultaneously
The positive voltage terminal provided by resistance R1 connections by power supply group；Voltage-regulator diode D1 anode connection resistance R6；Resistance R3 and electricity
The second output end is coupled between resistance R4；Signal amplification circuit includes operational amplifier IC2 and operational amplifier IC3；Operation amplifier
Device IC2 in-phase input end connects the 3rd input；Operational amplifier IC2 inverting input is defeated by inductance L2 connections second
Enter end, resistance R8 is coupled between the second input and inductance L2；Be in series with operational amplifier IC2 positive feedback electric capacity C1 and
Adjustable resistance RP2；Operational amplifier IC2 output end passes through resistance R9 concatenation operation amplifiers IC3 in-phase input end, computing
Amplifier IC3 inverting input concatenation operation amplifier IC3 output end and the 4th output end；Impedance inverter circuit it is adjustable
Resistance RP3 one end connection first input end, adjustable resistance RP3 other end ground connection, adjustable resistance RP3 adjustable end connection fortune
Calculate amplifier IC4 in-phase input end, operational amplifier IC4 inverting input concatenation operation amplifier IC4 output end and
5th output end.
2. air humidity indicating circuit according to claim 1, it is characterised in that：The electric capacity C2 of display circuit one end connects
The 5th input and voltmeter U1 anode are connect, the electric capacity C2 other end connects the 4th input and voltmeter U1 negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510464356.5A CN105067679B (en) | 2015-07-31 | 2015-07-31 | Air humidity indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510464356.5A CN105067679B (en) | 2015-07-31 | 2015-07-31 | Air humidity indicating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105067679A CN105067679A (en) | 2015-11-18 |
| CN105067679B true CN105067679B (en) | 2017-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510464356.5A Active CN105067679B (en) | 2015-07-31 | 2015-07-31 | Air humidity indicating circuit |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113966A (en) * | 2006-07-28 | 2008-01-30 | E+E电子有限责任公司 | Circuit and method for measuring humidity |
| CN102967633A (en) * | 2012-11-14 | 2013-03-13 | 深圳桑菲消费通信有限公司 | Air humidity detection method and device for mobile terminal |
| JP2013088153A (en) * | 2011-10-14 | 2013-05-13 | Panasonic Corp | Humidity detection apparatus |
| CN104267071A (en) * | 2014-09-03 | 2015-01-07 | 华南理工大学 | Humidity measuring circuit fast to respond |
| CN104634927A (en) * | 2013-11-11 | 2015-05-20 | 成都摩宝网络科技有限公司 | Air humidity monitoring and alarming simple circuit for aircraft cabin |
| CN204373687U (en) * | 2014-12-12 | 2015-06-03 | 储新民 | A kind of plant's environmental monitoring handheld device based on Internet of Things |
| CN204882444U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Air humidity indicating circuit |
-
2015
- 2015-07-31 CN CN201510464356.5A patent/CN105067679B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113966A (en) * | 2006-07-28 | 2008-01-30 | E+E电子有限责任公司 | Circuit and method for measuring humidity |
| JP2013088153A (en) * | 2011-10-14 | 2013-05-13 | Panasonic Corp | Humidity detection apparatus |
| CN102967633A (en) * | 2012-11-14 | 2013-03-13 | 深圳桑菲消费通信有限公司 | Air humidity detection method and device for mobile terminal |
| CN104634927A (en) * | 2013-11-11 | 2015-05-20 | 成都摩宝网络科技有限公司 | Air humidity monitoring and alarming simple circuit for aircraft cabin |
| CN104267071A (en) * | 2014-09-03 | 2015-01-07 | 华南理工大学 | Humidity measuring circuit fast to respond |
| CN204373687U (en) * | 2014-12-12 | 2015-06-03 | 储新民 | A kind of plant's environmental monitoring handheld device based on Internet of Things |
| CN204882444U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Air humidity indicating circuit |
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| Publication number | Publication date |
|---|---|
| CN105067679A (en) | 2015-11-18 |
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