CN205785606U - Digital pressure measuring instrument circuit - Google Patents
Digital pressure measuring instrument circuit Download PDFInfo
- Publication number
- CN205785606U CN205785606U CN201620216645.3U CN201620216645U CN205785606U CN 205785606 U CN205785606 U CN 205785606U CN 201620216645 U CN201620216645 U CN 201620216645U CN 205785606 U CN205785606 U CN 205785606U
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- analog
- digital converter
- measuring instrument
- circuit
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Abstract
The utility model discloses digital pressure measuring instrument circuit, including piezoresistive transducer, exported the voltage signal being directly proportional to the pressure by sensing ambient pressure；Operational amplification circuit, non-inverting amplified voltage signal；Analog-digital converter, is analyzed processing to the voltage signal of operational amplification circuit output, and then carry-out bit gating signal and binary-coded decimal data, if occurring range situation in binary-coded decimal, then exports range signal；Decoder, is converted into seven segment signals the binary-coded decimal of analog-digital converter output；Seven segment signals that decoder exports are carried out numerical monitor by numeral method device；Driver, received bit gating signal, drive numeral method device to show；Trigger, receive analog-digital converter output crosses range signal, latches mode with data, controls charactron by decoder and carries out flickering display.
Description
Technical field
This utility model relates to pressure measurement circuitry field, particularly relates to the pressure-measuring instrument electricity of a kind of numerical monitor
Road.
Background technology
Progress and the development of electronics industry, the various sensor that releases one after another both at home and abroad, integrated sensing along with science and technology
Device, large scale integrated circuit (LSI) and super large-scale integration (VLSI), this is for developing various digital instruments, intelligent digital
Instrument provides great convenience.Employ new technology, new technology, by sensor, LSI or VLSI and corresponding periphery circuit design
A large amount of appearances of new digital instrument, indicate a revolution of electronic instrumentation, also started electronic surveying
The beginning.Such as, on the basis of digital voltmeter, mix sensor (integrated sensor) and the respective peripheral such as temperature, power, pressure
Circuit, i.e. may make up one piece of digital thermometer (measuring instrument), power (measuring instrument), piezometer (measuring instrument) etc. various novel logical
By, special digital instrument or the system of measurement.
Utility model content
For objectivity and the accuracy of pressure-measuring instrument reading, meet the reading custom of people, alleviate visual fatigue,
This utility model provides digital pressure measuring instrument circuit.
The following scheme solving technical problem of this utility model employing:
Digital pressure measuring instrument circuit, it is characterised in that including:
Piezoresistive transducer, exports the voltage signal being directly proportional to described pressure by sensing ambient pressure；
Operational amplification circuit, homophase amplifies described voltage signal；
Analog-digital converter, the voltage signal exporting described operational amplification circuit is analyzed processing, and then carry-out bit choosing
Messenger and binary-coded decimal data, if occurring range situation in described binary-coded decimal, then exported range signal；
Decoder, the described binary-coded decimal that described analog-digital converter is exported is converted into seven segment signals；
Numeral method device, seven segment signals exported by described decoder carry out numerical monitor；
Driver, receives institute's rheme gating signal, drives described numeral method device to show；
Trigger, receive the output of described analog-digital converter crosses range signal, latches mode with data, by described decoding
Device controls described charactron and carries out flickering display.
Optionally, described operational amplification circuit includes operational amplifier, the tenth potentiometer, the 11st resistance and the 12nd electricity
Resistance；
Described 11st resistance and described tenth potentiometer are connected on the negative-phase input of described operational amplifier and described
Between the outfan of operational amplifier, the negative-phase input of described operational amplifier electrically connects described 12nd resistance to described pressure
The positive voltage of the negative voltage outfan of resistive sensor, the in-phase input end of described operational amplifier and described piezoresistive transducer
Outfan connects.
Further, the model of described operational amplifier is ICL7650.
It is also preferred that the left the clock pulse input terminal mouth of described trigger and the change-over period end mark of described analog-digital converter
Position outfan connects, the data-in port of described trigger and the Inverse code output end of described trigger and disappearing of described decoder
Hidden control end connects, and the reset terminal of described trigger is connected with the range flag bit end of crossing of described analog-digital converter, described triggering
The set end ground connection of device.
Further, the model of described trigger is CD4013.
It is also preferred that the left the input of described driver is connected with the position gating signal end of described analog-digital converter, described driving
The outfan of device is connected with described numeral method device common cathode end.
Further, the model of described driver is MC1413.
It is also preferred that the left this measuring instrument circuit also includes reading holding circuit, wherein,
Described reading holding circuit includes the 22nd resistance, a switch；
The EOC mark output end of described analog-digital converter electrically connects described 22nd resistance to described modulus and turns
The real-time output control terminal of parallel operation, described real-time output control terminal electrically connects the negative supply of described switch extremely described analog-digital converter
Port.
It is also preferred that the left this measuring instrument circuit also includes high-frequency filter circuit, wherein,
Described high-frequency filter circuit includes the 21st resistance and the 21st electric capacity, and the voltage of described analog-digital converter is defeated
Entering and be connected described 21st electric capacity between end and the simulation ground of described analog-digital converter, described voltage input end connects described the
The outfan of 21 resistance extremely described operational amplifier, described simulation ground ground connection.
This utility model has a following useful technique effect:
There is the advantages such as volume is little, reliable operation, circuit are simple, easy to use；
Using advanced digital display technology, measurement result is very clear, more meets the reading custom of people；
There is the advantages such as high accuracy, high-resolution, high performance-price ratio.
Accompanying drawing explanation
Fig. 1 is the digital pressure measuring instrument circuit block diagram that this utility model one embodiment provides；
Fig. 2 is the digital pressure measuring instrument circuit theory diagrams that this utility model one embodiment provides.
Detailed description of the invention
Below with reference to Fig. 1 and Fig. 2 by specific embodiment the utility model is further explained explanation.
Please comprehensive reference Fig. 1 and Fig. 2, digital pressure measuring instrument circuit, including:
Piezoresistive transducer DYC-103, exports the voltage signal being directly proportional to the pressure by sensing ambient pressure；
Constant-current source, to piezoresistive transducer DYC-103 constant current-supplying；
Regulated power supply, provides burning voltage to piezoresistive transducer DYC-103；
Operational amplification circuit, non-inverting amplified voltage signal；
Negative supply changer, provides negative voltage to chopper amplification circuit；
Analog-digital converter MC14433, is analyzed processing to the voltage signal of operational amplification circuit output, and then carry-out bit
Gating signal and binary-coded decimal data, if occurring range situation in binary-coded decimal, then exported range signal；
Reference voltage source circuit, provides reference voltage to analog digital conversion drive circuit；
Decoder CD4511, is converted into seven segment signals the binary-coded decimal of analog-digital converter MC14433 output；
Seven segment signals that decoder CD4511 exports are carried out numerical monitor by numeral method device；
Driver MC1413, received bit gating signal, drive numeral method device to show；
Trigger CD4013, receive analog-digital converter MC14433 output crosses range signal, latches mode with data, logical
Cross decoder CD4511 control charactron and carry out flickering display.
Operational amplification circuit includes operational amplifier ICL7650, the tenth potentiometer RP10, the 11st resistance R11 and the tenth
Two resistance R12；
11st resistance R11 and the tenth potentiometer RP10 is connected on negative-phase input and the fortune of operational amplifier ICL7650
Calculate between the outfan of amplifier ICL7650, negative-phase input electrical connection the 12nd resistance R12 of operational amplifier ICL7650
To the negative voltage outfan of piezoresistive transducer DYC-103, the in-phase input end of operational amplifier ICL7650 senses with pressure resistance type
The positive voltage output end of device DYC-103 connects.
ICL7650 is the chopper-zero-stabilized formula high accuracy that Intersil company utilizes dynamic zero resetting technology and CMOS technology to make
Operational amplifier, ICL7650 type ultra-low drift, copped wave Auto zeroing formula precision operational-amplifier make homophase amplify, voltage gain is
10 times, the weak voltage signals of 0～100mV accurately can be amplified to 1V, mate with digital voltmeter DVM.ICL7650 uses
14 foot dual-inline package or the encapsulation of 8 foot metal-backs, when using the ICL7650 of 14 foot dual-inline package, Ying Su
1,2 feet meet memory electric capacity C1, C2 respectively, it is recommended that being worth for 0.1uf, the 8th foot is the common port of C1, C2, and this grade of amplifier accuracy is excellent
In ± 0.5%.
The change-over period end mark of the clock pulse input terminal mouth CP and analog-digital converter MC14433 of trigger CD4013
Position EOC connects, the Inverse code output end of the data-in port D and trigger CD4013 of trigger CD4013With decoder
The blanking of CD4511 controls endConnecting, the reset terminal R and analog-digital converter MC14433 of trigger CD4013 crosses symbal of range
Position endConnect, the set end S ground connection of trigger CD4013.
The input I of driver MC14131-I4Position gating signal end DS with analog-digital converter MC144331-DS4Connect,
The outfan O of driver MC14131-O4It is connected with numeral method device common cathode end.
Digital pressure measuring instrument circuit also includes reading holding circuit, wherein,
Reading holding circuit includes the 22nd resistance R22, a switch S；
Change-over period end mark position EOC electrical connection the 22nd resistance R22 of analog-digital converter MC14433 turns to modulus
The real-time output control terminal DU of parallel operation MC14433, real-time output control terminal DU electrical connection switch S to analog-digital converter MC14433
Negative supply port USS, each analog digital conversion end cycle, change-over period end mark position EOC end exports a positive pulse, its arteries and veins
Rush that width is clock signal period 1/2；
Can be normally carried out the display of analog-digital conversion result when switching S and disconnecting, show value is constantly refreshed；As switch S
During Guan Bi.DU=0/, analog-digital conversion result is remained behind for a long time, and now modulus is in latch mode.Retention time i.e. switchs
Closing time, S is referred to as reading maintained switch.
Digital pressure measuring instrument circuit also includes high-frequency filter circuit, wherein,
High-frequency filter circuit includes the 21st resistance R21 and the 21st electric capacity C21, analog-digital converter MC14433's
Being connected the 21st electric capacity C21 between voltage input end and the simulation ground of analog-digital converter MC14433, voltage input end connects the
The outfan of 21 resistance R21 to operational amplifier ICL7650, simulation ground UAGGround connection.
High frequency filter has two effects: first is to filter High-frequency Interference, eliminates the impact of outer noise jamming, improves instrument
Signal to noise ratio；Second is the metering function by R21, prevents from damaging chip because current input signal is excessive, it is to avoid because of sensing
To instantaneous pressure, input is punctured.In view of the effect of high frequency filter, typically take R21=1M Ω, C21=0.1 μ F.
Reference voltage source circuit includes a voltage source MC1403 and a potentiometer RP, one end of potentiometer RP and voltage source
The earth terminal of MC1403 connects, and the other end of potentiometer RP is connected with the outfan of voltage source MC1403, and potentiometer RP is in order to obtain
Obtain positive reference voltage, make reference voltage for analog digital conversion drive circuit.
MC14433 requires one positive reference voltage U of outside offerREF, DVM such as full scale to be reached exports, takes UM=2v, root
Know according to above MC1443 Main Feature: reference voltage UREFAnd it is 1:1 relation between range, therefore the design takes UREF=UM=
2VUREFStability A/D is changed precision, the certainty of measurement of whole system is had a great impact, it should use high accuracy
Voltage source.
The principle of numeral method device work:
Analog-digital converter MC14433 selects signal DS1～DS4 to carry out dynamic scan by position, and decoder CD4511 is by modulus
The transformation result of transducer MC14433 is digitally implemented the LED light-emitting nixie tube dynamic scanning displaying of 4-digit number.Position choosing
Signal DS1～DS4 output multi-channel modulation strobe signal.DS gate pulse is to represent during high level that corresponding numerical digit is selected
Logical, now this bit data exports at Q0～Q3 end.Position select the sequential relationship of signal DS and change-over period end mark position EOC be
After the EOC end-of-pulsing of change-over period end mark position, export positive pulse followed by DS1.Next coming in order are that signal DS2 is selected in position,
Position selects signal DS3 and position to select signal DS4.During corresponding DS2, DS3 and DS4 gating, Q0～Q3 exports the full bit data of BCD, i.e.
The numeral 0～9 of correspondence is exported in 8421 yards of modes.During DS1 gates, half figure place 0 or l and excess of Q0～Q3 output kilobit
Journey, deficient range and polarity mark's signal.Change-over period end mark position EOC provides trigger CD4013 clock pulse signal, puts
Position end S ground connection, the D terminal number word of trigger CD4013 is latched to Q end, due to D end withConnect, crossing range flag bit
In the case of output low level,End exports low and high level in turn, and then the blanking controlling decoder CD4511 controls endMake
Obtain described numeral method device flickering display.
This utility model has a following useful technique effect:
There is the advantages such as volume is little, reliable operation, circuit are simple, easy to use；
Using advanced digital display technology, measurement result is very clear, more meets the reading custom of people；
There is the advantages such as high accuracy, high-resolution, high performance-price ratio.
The above, only this utility model preferably detailed description of the invention, but protection domain of the present utility model is not
Being confined to this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in
Change or replacement, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is as the criterion with scope of the claims.
Claims (9)
1. digital pressure measuring instrument circuit, it is characterised in that including:
Piezoresistive transducer, exports the voltage signal being directly proportional to described pressure by sensing ambient pressure；
Operational amplification circuit, homophase amplifies described voltage signal；
Analog-digital converter, the voltage signal exporting described operational amplification circuit is analyzed processing, and then carry-out bit gating letter
Number and binary-coded decimal data, if described binary-coded decimal occurred range situation, then exported range signal；
Decoder, the described binary-coded decimal that described analog-digital converter is exported is converted into seven segment signals；
Numeral method device, seven segment signals exported by described decoder carry out numerical monitor；
Driver, receives institute's rheme gating signal, drives described numeral method device to show；
Trigger, receive the output of described analog-digital converter crosses range signal, latches mode with data, by described decoder control
Make described charactron and carry out flickering display.
Digital pressure measuring instrument circuit the most according to claim 1, it is characterised in that: described operational amplification circuit includes
Operational amplifier, the tenth potentiometer, the 11st resistance and the 12nd resistance；
Described 11st resistance and described tenth potentiometer are connected on the negative-phase input of described operational amplifier and described computing
Between the outfan of amplifier, the negative-phase input of described operational amplifier electrically connects described 12nd resistance to described pressure resistance type
The negative voltage outfan of sensor, the in-phase input end of described operational amplifier exports with the positive voltage of described piezoresistive transducer
End connects.
Digital pressure measuring instrument circuit the most according to claim 2, it is characterised in that: the model of described operational amplifier
For ICL7650.
Digital pressure measuring instrument circuit the most according to claim 1, it is characterised in that: the clock pulses of described trigger
Input port is connected with the change-over period end mark position outfan of described analog-digital converter, the data input pin of described trigger
The Inverse code output end of mouth and described trigger controls end with the blanking of described decoder and is connected, the reset terminal of described trigger and institute
The range flag bit end of crossing stating analog-digital converter connects, the set end ground connection of described trigger.
Digital pressure measuring instrument circuit the most according to claim 4, it is characterised in that: the model of described trigger is
CD4013。
Digital pressure measuring instrument circuit the most according to claim 1, it is characterised in that: the input of described driver with
The position gating signal end of described analog-digital converter connects, the outfan of described driver and described numeral method device common cathode
End connects.
Digital pressure measuring instrument circuit the most according to claim 6, it is characterised in that: the model of described driver is
MC1413。
Digital pressure measuring instrument circuit the most according to claim 1, it is characterised in that this measuring instrument circuit also includes
Reading holding circuit, wherein,
Described reading holding circuit includes the 22nd resistance, a switch；
The EOC mark output end of described analog-digital converter electrically connects described 22nd resistance to described analog-digital converter
Real-time output control terminal, described real-time output control terminal electrically connects described switch to the negative power end of described analog-digital converter
Mouthful.
Digital pressure measuring instrument circuit the most according to claim 1, it is characterised in that this measuring instrument circuit also includes
High-frequency filter circuit, wherein,
Described high-frequency filter circuit includes the 21st resistance and the 21st electric capacity, the voltage input end of described analog-digital converter
And being connected described 21st electric capacity between the simulation ground of described analog-digital converter, described voltage input end connects the described 20th
The outfan of one resistance extremely described operational amplifier, described simulation ground ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620216645.3U CN205785606U (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620216645.3U CN205785606U (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205785606U true CN205785606U (en) | 2016-12-07 |
Family
ID=57414045
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620216645.3U Expired - Fee Related CN205785606U (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698979A (en) * | 2016-03-21 | 2016-06-22 | 苏州工业职业技术学院 | Digital pressure measuring instrument circuit |
| CN110379527A (en) * | 2019-08-01 | 2019-10-25 | 岭澳核电有限公司 | Display and control device applied to nuclear power station dish platform system |
| CN110379528A (en) * | 2019-08-01 | 2019-10-25 | 岭澳核电有限公司 | Display and control device applied to nuclear power station dish platform system |
| CN110412918A (en) * | 2019-08-01 | 2019-11-05 | 岭澳核电有限公司 | Display and setting device applied to nuclear power station dish platform system |
| CN112822594A (en) * | 2021-01-14 | 2021-05-18 | 深圳市芯中芯科技有限公司 | Interaction method and system based on Bluetooth headset |
-
2016
- 2016-03-21 CN CN201620216645.3U patent/CN205785606U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698979A (en) * | 2016-03-21 | 2016-06-22 | 苏州工业职业技术学院 | Digital pressure measuring instrument circuit |
| CN110379527A (en) * | 2019-08-01 | 2019-10-25 | 岭澳核电有限公司 | Display and control device applied to nuclear power station dish platform system |
| CN110379528A (en) * | 2019-08-01 | 2019-10-25 | 岭澳核电有限公司 | Display and control device applied to nuclear power station dish platform system |
| CN110412918A (en) * | 2019-08-01 | 2019-11-05 | 岭澳核电有限公司 | Display and setting device applied to nuclear power station dish platform system |
| CN110379527B (en) * | 2019-08-01 | 2022-01-04 | 岭澳核电有限公司 | Display and control device applied to nuclear power station coil platform system |
| CN112822594A (en) * | 2021-01-14 | 2021-05-18 | 深圳市芯中芯科技有限公司 | Interaction method and system based on Bluetooth headset |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20161207 Termination date: 20180321 |