CN206540959U - One kind surveys capacitance variations multichannel DA-AD Acquisition Circuit - Google Patents
One kind surveys capacitance variations multichannel DA-AD Acquisition Circuit Download PDFInfo
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- CN206540959U CN206540959U CN201720265554.3U CN201720265554U CN206540959U CN 206540959 U CN206540959 U CN 206540959U CN 201720265554 U CN201720265554 U CN 201720265554U CN 206540959 U CN206540959 U CN 206540959U
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- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Abstract
The utility model is related to a kind of survey capacitance variations multichannel DA-AD Acquisition Circuit, it is characterised in that the Acquisition Circuit includes power module, AD multiplexer channels acquisition module, RS232 communication modules, MCU microcontrollers, DA multiplexer channels output module and display screen；The power module is that whole Acquisition Circuit is powered；Testing capacitance is connected between AD multiplexer channels acquisition module and DA multiplexer channel output modules；The MCU microcontrollers are connected with DA multiplexer channels output module, RS232 communication modules and AD multiplexer channel acquisition modules respectively；The output end of the RS232 communication modules is connected with display screen；The AD multiplexer channels acquisition module includes n eight channel multiplexers of input, n is natural number, a two-level operating amplifier is connected respectively between n passage of the n AD port for inputting eight channel multiplexers and MCU microcontrollers, and each two-level operating amplifier is constituted by two one-level operational amplifiers.
Description
Technical field
The utility model is related to capacitance variations circuit, is specifically a kind of survey capacitance variations multichannel DA-AD Acquisition Circuit.
Background technology
In the research of Fundamentals of Sensors, for calculating the spacing of battery lead plate with capacitance variations size between measuring electrode
From change size physical principle, its occasion for being applied to sensor has a lot, and specific survey capacitance variations circuit is also five flowers
Eight, respectively have a feature, common problem is that circuit is complicated, and cost is higher.
Patent No. 201310259545X Chinese patent discloses a kind of voltage type super capacitor detection circuit, the circuit
It is that the ultracapacitor composed in parallel by multiple ultracapacitor groups, the spy with on-line checking are detected with controllable bleeder circuit
Point, but the circuit can only once detect an electric capacity, it is impossible to multichannel capacitance detecting is realized, and is difficult to quantitatively judge.
Utility model content
Become in view of the deficienciess of the prior art, the technical problem that the utility model is intended to solve is to provide a kind of electric capacity of surveying
Change with multichannel DA-AD Acquisition Circuit.The Acquisition Circuit can be surveyed simultaneously by the way that MCU microcontrollers are connected with multiplexer
Multichannel capacitance variations are measured, frequency acquisition is stable and rapid in actual acquisition test, and cost is low, and valency is delivered with good market
Value.
The technical scheme that the utility model solves the technical problem is to provide a kind of survey capacitance variations multichannel DA-AD
Acquisition Circuit, it is characterised in that the Acquisition Circuit include power module, AD multiplexer channels acquisition module, RS232 communication modules,
MCU microcontrollers, DA multiplexer channels output module and display screen；The power module is that whole Acquisition Circuit is powered；It is many in AD
Testing capacitance is connected between paths acquisition module and DA multiplexer channel output modules；The MCU microcontrollers are more with DA respectively
Paths output module, RS232 communication modules and the connection of AD multiplexer channels acquisition module；The output of the RS232 communication modules
End is connected with display screen；
The AD multiplexer channels acquisition module includes n eight channel multiplexers of input, and n is natural number, in n input
A two-level operating amplifier is connected between n passage of the AD ports of eight channel multiplexers and MCU microcontrollers respectively,
Each two-level operating amplifier is constituted by two one-level operational amplifiers；Eight channel multiplexers of the n input are taken
Parallel way is connected, and each passage sampling resistor in parallel of eight channel multiplexers of each input, selection input
The digital signal channel of eight channel multiplexers, gathers the voltage of sampling resistor；
The DA multiplexer channels output module includes n eight channel multiplexers of output, at the DA ends of MCU microcontrollers
One one-level operational amplifier of connection connects between mouth and n eight channel multiplexers of output；Eight passage multichannels of the n output
Multiplexer takes parallel way to connect, for selecting data signal path to export sinusoidal voltage for corresponding testing capacitance.
The utility model has the advantages that due to using above technical scheme：
1) the utility model has reached the effect of collection capacitance variations using phase-shift circuit (RC circuits) principle, is sensor
The sensing principle for reacting other factors change using capacitance variations in field contributes；
2) the utility model manufacturability is good, and finished product easily makes and cheap, with good economy；
3) the utility model carries out AD multi pass acquisitions using multiple multiplexers, can be with Quick Acquisition up to 8n roads capacitance variations
Signal, when there is four multiplexers, can the tunnel capacitance variations of Quick Acquisition 32, and frequency acquisition span is big, adapts to most occasions
Acquisition rate requirement.
Brief description of the drawings
Fig. 1 is that the utility model surveys capacitance variations multichannel DA-AD Acquisition Circuit overall structure diagram；
Fig. 2 is the principle of equal effects schematic diagram that the utility model gathers capacitance variations；
In figure：1st, power module；2nd, AD multiplexer channels acquisition module；3rd, RS232 communication modules；4th, MCU microcontrollers；5、
DA multiplexer channel output modules；6th, condensance；7th, electric capacity；8th, voltmeter；9th, sampling resistor；10th, AC power；11st, show
Screen.
Embodiment
Specific embodiment of the utility model is given below, specific embodiment is only used for being further described this practicality newly
Type, but the application scope of the claims is not limited.
The utility model surveys capacitance variations includes electricity with multichannel DA-AD Acquisition Circuit (abbreviation Acquisition Circuit, referring to Fig. 1)
Source module 1, AD multiplexer channels acquisition module 2, RS232 communication modules 3, MCU microcontrollers 4, the and of DA multiplexer channels output module 5
Display screen 11；The power module 1 is that whole Acquisition Circuit is powered；It is defeated in AD multiplexer channels acquisition module 2 and DA multiplexer channels
Go out between module 5 and connect testing capacitance；The MCU microcontrollers 4 communicate mould with DA multiplexer channels output module 5, RS232 respectively
Block 3 and AD multiplexer channels acquisition module 2 are connected；The output end of the RS232 communication modules 3 is connected with display screen 11；
The AD multiplexer channels acquisition module 2 includes n eight channel multiplexers of input, and n is natural number, defeated at n
Two grades of operation amplifiers are connected between n passage of the AD ports for entering eight channel multiplexers and MCU microcontrollers respectively
Device, each two-level operating amplifier is constituted by two one-level operational amplifiers；Eight channel multiplexers of the n input are adopted
Parallel way is taken to connect, and each passage sampling resistor in parallel of eight channel multiplexers of each input, select defeated
Enter the digital signal channel of eight channel multiplexers, gather the voltage of sampling resistor；
The DA multiplexer channels output module 5 includes n eight channel multiplexers of output, in the DA of MCU microcontrollers
One one-level operational amplifier of connection connects between port and n eight channel multiplexers of output；Eight passages of the n output are more
Path multiplexer takes parallel way to connect, for selecting data signal path to export sinusoidal voltage for corresponding testing capacitance.
Eight channel multiplexers of the output and the eight passage multichannels of input of the present utility model of being further characterized by are answered
It is CD74HC4051, the model STM32F103VET6 of MCU microcontrollers, the type of one-level operational amplifier with the model of device
Number it is MCP6022.
The resistance of the present utility model for being further characterized by the sampling resistor is one megaohm.Sampling resistor value is not
Have an impact with to the electric capacity both end voltage response time, one megaohm ideal.
It is of the present utility model be further characterized by the testing capacitance circuit including no more than 8n parallel connection electric capacity.
The utility model surveys capacitance variations：Survey electricity
Holding size variation causes the voltage at the sampling resistor two ends of series connection to change, by the voltage change for measuring sampling resistor two ends
The change (referring to Fig. 2) for the capacitance size to be gathered can be reflected, first DA multiplexer channels are exported during measurement multichannel electric capacity
Module 5 connects multichannel electric capacity, then by USB connections display screen 11, opens correspondence serial ports in display screen, you can display sampling resistor
The magnitude of voltage at two ends, AD collection values during capacitance variations on sampling resistor 9 also can accordingly change.
Fig. 2 is the principle of equal effects schematic diagram of collection capacitance variations, is as can be seen from Figure 2 parallel with each electric capacity 7
One condensance 6, condensance is considered as infinity；Then connect again a sampling resistor 9, the two ends of sampling resistor 9 electricity in parallel
One passage of pressure table 8, i.e., one eight channel multiplexer of input is equivalent to a voltmeter 8, DA multiplexer channels output mould
Block 5 is equivalent to an AC power 10；Testing capacitance is connected on DA multiplexer channels output module 5 and AD multiplexer channels acquisition module 2
Between；The size variation of electric capacity in every road can be reflected by voltmeter change；Quantitative can reflect capacitance variations number.
The utility model Acquisition Circuit can gather the change of no more than 8n electric capacity in parallel simultaneously.The MCU micro-controls
Device processed sends high-frequency sinusoidal voltage by the DA ports of itself, while four in the AD ports of opening MCU microcontrollers are led to
Road is acquired, enable corresponding ports control DA multiplexer channels output module 5 and AD multiplexer channels acquisition module 2 works, enabled
The corresponding ports of communication are completed with display screen, correspondence program is entered according to Acquisition Circuit burning；Wherein described correspondence program is micro- by MCU
Controller built-in function is provided, and program sets and can completed according to prior art；
DA multiplexer channels output module 5 connects the DA ports of MCU microcontrollers, the AD ports connection AD of MCU microcontrollers
Mutually corresponded between multiplexer channel acquisition module 2, each passage, the testing capacitance of change is connected between 32 groups of paths of formation.
Embodiment 1
The present embodiment, which surveys capacitance variations multichannel DA-AD Acquisition Circuit, includes power module 1, AD multiplexer channels collection mould
Block 2, RS232 communication modules 3, MCU microcontrollers 4, DA multiplexer channels output module 5 and display screen 11；The power module 1 is adopted
It is that whole Acquisition Circuit is powered with USB connected modes, supply voltage VCC=5V；In AD multiplexer channels acquisition module 2 and DA multichannels
Testing capacitance is connected between passage output module 5；The MCU microcontrollers 4 respectively with DA multiplexer channels output module 5, RS232
Communication module 3 and AD multiplexer channels acquisition module 2 are connected；The output end of the RS232 communication modules 3 takes USB to turn serial ports side
Formula is connected with display screen 11, and corresponding sampling resistor both end voltage changing value during per road capacitance variations is shown in display screen；
The AD multiplexer channels acquisition module 2 includes four eight channel multiplexers of input and four two grades of operation amplifiers
Device and 32 sampling resistors；Four AD ports for inputting eight channel multiplexers and MCU microcontrollers four passages it
Between connect a two-level operating amplifier respectively, each two-level operating amplifier is constituted by two one-level operational amplifiers, institute
Stating four eight channel multiplexers of input takes parallel way to connect, and each of eight channel multiplexers of each input is led to
A road sampling resistor in parallel, the digital signal channel of selection eight channel multiplexers of input gathers the electricity of sampling resistor
Pressure；
The DA multiplexer channels output module 5 includes four eight channel multiplexers of output and an one-level operation amplifier
Device, one-level operational amplifier is connected between the DA ports of MCU microcontrollers and four eight channel multiplexers of output；Described four
Eight channel multiplexers of individual output take parallel way to connect, for selecting data signal path defeated for corresponding testing capacitance
Go out sinusoidal voltage；
Exported in the present embodiment eight channel multiplexers and input eight channel multiplexers model be
The model STM32F103VET6 of CD74HC4051, MCU microcontroller, the model of involved one-level operational amplifier is
MCP6022；The RS232 communication modules turn serial port chip, ethernet controller and network transformer including USB；USB turns serial ports
The model PL2303HX of chip, the model ENC28J60 of ethernet controller, the model of network transformer
HR911105A.The testing capacitance circuit has 32 electric capacity in parallel；The resistance of each sampling resistor is one megaohm.
In following table data be the tunnel capacitance variations of actual test 8 before and after, the result of the voltage change of collection, wherein AD DLTs
The AD frequency acquisition 100HZ of road acquisition module 2, in limit test, 32 road electric capacity are connected entirely, and AD frequency acquisitions are reached as high as
300HZ, it is real-time.
The utility model does not address part and is applied to prior art.
Claims (5)
1. one kind surveys capacitance variations multichannel DA-AD Acquisition Circuit, it is characterised in that the Acquisition Circuit includes power module, AD
Multiplexer channel acquisition module, RS232 communication modules, MCU microcontrollers, DA multiplexer channels output module and display screen；The electricity
Source module is that whole Acquisition Circuit is powered；Connect to be measured between AD multiplexer channels acquisition module and DA multiplexer channel output modules
Electric capacity；The MCU microcontrollers gather mould with DA multiplexer channels output module, RS232 communication modules and AD multiplexer channels respectively
Block is connected；The output end of the RS232 communication modules is connected with display screen；
The AD multiplexer channels acquisition module includes n eight channel multiplexers of input, and n is natural number, leads in n input eight
A two-level operating amplifier is connected between n passage of the AD ports of road multiplexer and MCU microcontrollers respectively, each
Two-level operating amplifier is constituted by two one-level operational amplifiers；Eight channel multiplexers of the n input take parallel connection
Mode is connected, and each passage sampling resistor in parallel of eight channel multiplexers of each input, and selection input eight is led to
The digital signal channel of road multiplexer, gathers the voltage of sampling resistor；
The DA multiplexer channels output module includes n eight channel multiplexers of output, in the DA ports of MCU microcontrollers and
One one-level operational amplifier of connection connects between n eight channel multiplexers of output；The n output eight passages multiplexing
Device takes parallel way to connect, for selecting data signal path to export sinusoidal voltage for corresponding testing capacitance.
2. survey capacitance variations multichannel DA-AD Acquisition Circuit according to claim 1, it is characterised in that the output eight
The model of eight channel multiplexers of channel multiplexer and input is CD74HC4051, the model of MCU microcontrollers
STM32F103VET6, the model of one-level operational amplifier is MCP6022.
3. survey capacitance variations multichannel DA-AD Acquisition Circuit according to claim 1, it is characterised in that the sampling electricity
The resistance of resistance is one megaohm.
4. survey capacitance variations multichannel DA-AD Acquisition Circuit according to claim 1, it is characterised in that n=4.
5. survey capacitance variations multichannel DA-AD Acquisition Circuit according to claim 1, it is characterised in that the electricity to be measured
Capacitive circuit includes no more than 8n electric capacity in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265554.3U CN206540959U (en) | 2017-03-19 | 2017-03-19 | One kind surveys capacitance variations multichannel DA-AD Acquisition Circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265554.3U CN206540959U (en) | 2017-03-19 | 2017-03-19 | One kind surveys capacitance variations multichannel DA-AD Acquisition Circuit |
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| Publication Number | Publication Date |
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| CN206540959U true CN206540959U (en) | 2017-10-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110033741A (en) * | 2019-04-19 | 2019-07-19 | 深圳市华星光电半导体显示技术有限公司 | Multiplex electronics and display device |
-
2017
- 2017-03-19 CN CN201720265554.3U patent/CN206540959U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110033741A (en) * | 2019-04-19 | 2019-07-19 | 深圳市华星光电半导体显示技术有限公司 | Multiplex electronics and display device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240102 Address after: No. 19 Xinye 7th Street, West District, Binhai New Area Economic and Technological Development Zone, Tianjin, 300450 Patentee after: TIANJIN HANHAI LANFAN MARINE TECHNOLOGY CO.,LTD. Address before: 300130 No. 8, Hebei University of Technology, Tianjin, Hongqiao No. 330 Patentee before: Hebei University of Technology |
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| TR01 | Transfer of patent right |