CN105698979A - Digital pressure measuring instrument circuit - Google Patents
Digital pressure measuring instrument circuit Download PDFInfo
- Publication number
- CN105698979A CN105698979A CN201610160700.6A CN201610160700A CN105698979A CN 105698979 A CN105698979 A CN 105698979A CN 201610160700 A CN201610160700 A CN 201610160700A CN 105698979 A CN105698979 A CN 105698979A
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- Prior art keywords
- analog
- digital converter
- digital
- circuit
- operational amplifier
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Disclosed in the invention is a digital pressure measuring instrument circuit comprising a piezoresistive sensor, an operational amplifier circuit, an analog-to-digital converter, a decoder, a nixie tube display device, a driver, and a trigger. The piezoresistive sensor senses an external pressure and outputs a voltage signal in direct proportion to the pressure. The operational amplifier circuit amplifies the voltage signal in an in-phase mode. The analog-to-digital converter carries out analysis processing on the voltage signal outputted by the operational amplifier circuit and thus outputs a bit gating signal and BCD code data; and if an over-range situation occurs in the BCD code, an over-range signal is outputted. The decoder converts the BCD code outputted by the analog-to-digital converter into seven segments of signals. The nixie tube display device carries out digital displaying on the seven segments of signals outputted by the decoder. The driver receives a bit gating signal and drives the nixie tube display device to carry out displaying. The trigger receives the over-range signal outputted by the analog-to-digital converter; and the nixie tube is controlled by the decoder in a data latching mode to carry out blinking display.
Description
Technical field
The present invention relates to pressure measurement circuitry field, particularly relate to the pressure-measuring instrument circuit of a kind of numerical monitor。
Background technology
Development along with scientific and technical progress and electronics industry, release one after another various sensor, integrated sensor, large scale integrated circuit (LSI) and super large-scale integration (VLSI) both at home and abroad, this is for developing various digital instruments, and digital meter's provides great convenience。Employ new technology, new technology, by a large amount of appearances of the new digital instrument of sensor, LSI or VLSI and corresponding periphery circuit design, indicate a revolution of electronic instrumentation, also started the beginning of electronic surveying。Such as, on the basis of digital voltmeter, mix sensor (integrated sensor) and the respective peripheral circuit such as temperature, power, pressure, namely may make up the various novel universals such as one piece of digital thermometer (measuring instrument), power (measuring instrument), piezometer (measuring instrument), special digital instrument or the system of measurement。
Summary of the invention
For objectivity and the accuracy of pressure-measuring instrument reading, meet the reading custom of people, alleviate visual fatigue, the invention provides digital pressure and measure equipment circuit。
The present invention adopts the scheme of following solution technical problem:
Digital pressure measures equipment 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 that described operational amplification circuit is exported is analyzed processing, and then carry-out bit gating signal and binary-coded decimal data, if occurring range situation in described binary-coded decimal, then exports range signal；
Decoder, the described binary-coded decimal that described analog-digital converter is exported converts seven segment signals to；
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 display；
Trigger, what receive the output of described analog-digital converter crosses range signal, latches mode with data, controls described charactron by described decoder and carries out flickering display。
Optionally, 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 between the negative-phase input of described operational amplifier and the outfan of described operational amplifier, the negative-phase input of described operational amplifier electrically connects described 12nd resistance negative voltage outfan to described piezoresistive transducer, and the in-phase input end of described operational amplifier is connected with the positive voltage output end of described piezoresistive transducer。
Further, the model of described operational amplifier is ICL7650。
Preferably, the clock pulse input terminal mouth of described trigger is connected with the change-over period end mark position outfan of described analog-digital converter, the data-in port of described trigger and the Inverse code output end of described trigger control end with the blanking of described decoder and are connected, the reset terminal of described trigger is connected with the range flag bit end of crossing of described analog-digital converter, the set end ground connection of described trigger。
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, the outfan of described driver 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 measurement equipment 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 the described 22nd resistance real-time output control terminal to described analog-digital converter, and described real-time output control terminal electrically connects the described switch negative supply port to described analog-digital converter。
It is also preferred that the left this measurement equipment circuit also includes high-frequency filter circuit, wherein,
Described high-frequency filter circuit includes the 21st resistance and the 21st electric capacity, described 21st electric capacity it is connected between the voltage input end of described analog-digital converter and the simulation ground of described analog-digital converter, described voltage input end connects described 21st resistance outfan to described operational amplifier, described simulation ground ground connection。
The present invention has following useful technique effect:
There is the advantages such as volume is little, reliable operation, circuit are simple, easy to use；
Adopting 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 that the digital pressure that one embodiment of the invention provides measures instrument circuit block diagram；
Fig. 2 is that the digital pressure that one embodiment of the invention provides measures instrument circuit theory diagrams。
Detailed description of the invention
The present invention is further explained by specific embodiment below with reference to Fig. 1 and Fig. 2。
Please comprehensive reference Fig. 1 and Fig. 2, digital pressure measure equipment 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 exports range signal；
Reference voltage source circuit, provides reference voltage to analog digital conversion drive circuit；
Decoder CD4511, converts seven segment signals to 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 display；
Trigger CD4013, what receive analog-digital converter MC14433 output crosses range signal, latches mode with data, controls charactron by decoder CD4511 and carries out flickering display。
Operational amplification circuit includes operational amplifier ICL7650, the tenth potentiometer RP10, the 11st resistance R11 and the 12 resistance R12；
11st resistance R11 and the tenth potentiometer RP10 is connected between the negative-phase input of operational amplifier ICL7650 and the outfan of operational amplifier ICL7650, the negative voltage outfan of negative-phase input electrical connection the 12nd resistance R12 to piezoresistive transducer DYC-103 of operational amplifier ICL7650, the in-phase input end of operational amplifier ICL7650 is connected with the positive voltage output end of piezoresistive transducer DYC-103。
ICL7650 is the chopper-zero-stabilized formula high precision operating amplifier that Intersil company utilizes that dynamic zero resetting technology and CMOS technology make, ICL7650 type ultra-low drift, copped wave Auto zeroing formula precision operational-amplifier are made homophase and are amplified, voltage gain is 10 times, the weak voltage signals of 0～100mV accurately can be amplified to 1V, mate with digital voltmeter DVM。ICL7650 adopts 14 foot dual-inline package or the encapsulation of 8 foot metal-backs, when adopting the ICL7650 of 14 foot dual-inline package, memory electric capacity C1, C2 should be met respectively at Soviet Union's 1,2 feet, it is recommended that be worth for 0.1uf, 8th foot is the common port of C1, C2, and this grade of amplifier accuracy is better than ± 0.5%。
The change-over period end mark position EOC of clock pulse input terminal mouth CP and the analog-digital converter MC14433 of trigger CD4013 is connected, the Inverse code output end of the data-in port D and trigger CD4013 of trigger CD4013Blanking with decoder CD4511 controls endConnecting, the reset terminal R and analog-digital converter MC14433 of trigger CD4013 crosses range flag bit 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 is measured equipment circuit and is also included reading holding circuit, wherein,
Reading holding circuit includes the 22nd resistance R22, a switch S；
The change-over period end mark position EOC of analog-digital converter MC14433 electrically connects the negative supply port U of real-time output control terminal DU, the real-time output control terminal DU electrical connection switch S to analog-digital converter MC14433 of the 22nd resistance R22 to analog-digital converter MC14433SS, each analog digital conversion end cycle, change-over period end mark position EOC end exports a positive pulse, and its pulse width is the 1/2 of clock signal period；
Can be normally carried out the display of analog-digital conversion result when switching S and disconnecting, show value is constantly refreshed；When the switch s is closed。DU=0/, analog-digital conversion result is remained behind for a long time, and now modulus is in latch mode。Retention time and switch-closed time, S is called reading maintained switch。
Digital pressure is measured equipment circuit and is also included high-frequency filter circuit, wherein,
High-frequency filter circuit includes the 21st resistance R21 and the 21 electric capacity C21, the 21st electric capacity C21 it is connected between the voltage input end of analog-digital converter MC14433 and the simulation ground of analog-digital converter MC14433, voltage input end connects the outfan of the 21st resistance R21 to operational amplifier ICL7650, simulation ground UAGGround connection。
High frequency filter has two effects: first is filter High-frequency Interference, eliminates the impact of outer noise jamming, improves the signal to noise ratio of instrument；Second is the metering function by R21, it is prevented that the defective chip because current input signal is excessive, it is to avoid punctured by input because sensing instantaneous pressure。In view of the effect of high frequency filter, generally take R21=1M Ω, C21=0.1 μ F。
Reference voltage source circuit includes an a voltage source MC1403 and potentiometer RP, one end of potentiometer RP is connected with the earth terminal of voltage source MC1403, the other end of potentiometer RP is connected with the outfan of voltage source MC1403, potentiometer RP is in order to obtain positive reference voltage, for analog digital conversion drive circuit voltage for referencial use。
MC14433 requires one positive reference voltage U of outside offerREF, DVM, as reached full scale output, takes UM=2v, knows 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 adopt high precision electro potential source。
The principle of numeral method device work:
Analog-digital converter MC14433 selects signal DS1～DS4 to carry out dynamic scan by position, and the transformation result of analog-digital converter MC14433 is realized the LED light-emitting nixie tube dynamic scanning displaying of 4-digit number by decoder CD4511 in a digital manner。Signal DS1～DS4 output multi-channel modulation strobe signal is selected in position。DS gate pulse represents when being high level that corresponding numerical digit is strobed, and now this bit data exports at Q0～Q3 end。Position selects the sequential relationship of signal DS and change-over period end mark position EOC to be after the EOC end-of-pulsing of change-over period end mark position, exports positive pulse followed by DS1。Next coming in order are that signal DS2 is selected in position, and 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, namely exports the numeral 0～9 of correspondence in 8421 yards of modes。During DS1 gating, Q0～Q3 exports half figure place 0 or the l of kilobit and crosses range, owes range and polarity mark's signal。Change-over period end mark position EOC provides trigger CD4013 clock pulse signal, set end S ground connection, and the D terminal number word of trigger CD4013 is latched to Q end, due to D end withConnect, crossing range flag bitWhen output low level,End exports low and high level in turn, and then the blanking controlling decoder CD4511 controls endMake described numeral method device flickering display。
The present invention has following useful technique effect:
There is the advantages such as volume is little, reliable operation, circuit are simple, easy to use；
Adopting 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; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention。Therefore, protection scope of the present invention should be as the criterion with scope of the claims。
Claims (9)
1. digital pressure measures equipment 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 that described operational amplification circuit is exported is analyzed processing, and then carry-out bit gating signal and binary-coded decimal data, if occurring range situation in described binary-coded decimal, then exports range signal；
Decoder, the described binary-coded decimal that described analog-digital converter is exported converts seven segment signals to；
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 display；
Trigger, what receive the output of described analog-digital converter crosses range signal, latches mode with data, controls described charactron by described decoder and carries out flickering display。
2. digital pressure according to claim 1 measures equipment circuit, 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 between the negative-phase input of described operational amplifier and the outfan of described operational amplifier, the negative-phase input of described operational amplifier electrically connects described 12nd resistance negative voltage outfan to described piezoresistive transducer, and the in-phase input end of described operational amplifier is connected with the positive voltage output end of described piezoresistive transducer。
3. digital pressure according to claim 2 measures equipment circuit, it is characterised in that: the model of described operational amplifier is ICL7650。
4. digital pressure according to claim 1 measures equipment circuit, it is characterized in that: the clock pulse input terminal mouth of described trigger is connected with the change-over period end mark position outfan of described analog-digital converter, the data-in port of described trigger and the Inverse code output end of described trigger control end with the blanking of described decoder and are connected, the reset terminal of described trigger is connected with the range flag bit end of crossing of described analog-digital converter, the set end ground connection of described trigger。
5. digital pressure according to claim 4 measures equipment circuit, it is characterised in that: the model of described trigger is CD4013。
6. digital pressure according to claim 1 measures equipment circuit, it is characterised in that: the input of described driver is connected with the position gating signal end of described analog-digital converter, and the outfan of described driver is connected with described numeral method device common cathode end。
7. digital pressure according to claim 6 measures equipment circuit, it is characterised in that: the model of described driver is MC1413。
8. digital pressure according to claim 1 measures equipment circuit, it is characterised in that this measurement equipment 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 the described 22nd resistance real-time output control terminal to described analog-digital converter, and described real-time output control terminal electrically connects the described switch negative supply port to described analog-digital converter。
9. digital pressure according to claim 1 measures equipment circuit, it is characterised in that this measurement equipment circuit also includes high-frequency filter circuit, wherein,
Described high-frequency filter circuit includes the 21st resistance and the 21st electric capacity, described 21st electric capacity it is connected between the voltage input end of described analog-digital converter and the simulation ground of described analog-digital converter, described voltage input end connects described 21st resistance outfan to described operational amplifier, described simulation ground ground connection。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160700.6A CN105698979A (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160700.6A CN105698979A (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
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| CN105698979A true CN105698979A (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610160700.6A Pending CN105698979A (en) | 2016-03-21 | 2016-03-21 | Digital pressure measuring instrument circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882468A (en) * | 2017-11-30 | 2018-04-06 | 肇庆高新区新伟达科技有限公司 | Car trunk opening device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275715A (en) * | 2000-06-21 | 2000-12-06 | 杨廷方 | Digital pressure gauge |
| CN103712728A (en) * | 2013-12-05 | 2014-04-09 | 深圳市爱立康医疗电子有限公司 | Electronic pressure gauge |
| CN205785606U (en) * | 2016-03-21 | 2016-12-07 | 苏州工业职业技术学院 | Digital pressure measuring instrument circuit |
-
2016
- 2016-03-21 CN CN201610160700.6A patent/CN105698979A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275715A (en) * | 2000-06-21 | 2000-12-06 | 杨廷方 | Digital pressure gauge |
| CN103712728A (en) * | 2013-12-05 | 2014-04-09 | 深圳市爱立康医疗电子有限公司 | Electronic pressure gauge |
| CN205785606U (en) * | 2016-03-21 | 2016-12-07 | 苏州工业职业技术学院 | Digital pressure measuring instrument circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882468A (en) * | 2017-11-30 | 2018-04-06 | 肇庆高新区新伟达科技有限公司 | Car trunk opening device and method |
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