CN110032114A - A kind of high-precision analog signal acquisition processing circuit - Google Patents
A kind of high-precision analog signal acquisition processing circuit Download PDFInfo
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- CN110032114A CN110032114A CN201910334287.4A CN201910334287A CN110032114A CN 110032114 A CN110032114 A CN 110032114A CN 201910334287 A CN201910334287 A CN 201910334287A CN 110032114 A CN110032114 A CN 110032114A
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- 238000012545 processing Methods 0.000 title claims abstract description 52
- 239000003990 capacitor Substances 0.000 claims description 37
- 230000005611 electricity Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000011084 recovery Methods 0.000 description 6
- 229910052715 tantalum Inorganic materials 0.000 description 5
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- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses a kind of high-precision analog signal acquisition processing circuits, including analog signal input circuit, channel selection control circuit, signal processing circuit and analog signal counting circuit, the input terminal of the analog signal input circuit connects analog signal to be monitored, the output end of the analog signal input circuit and the input terminal of channel selection control circuit connect, the output end of the channel selection control circuit and the input terminal of signal processing circuit connect, the output end of the signal processing circuit is connect with the input terminal of analog signal counting circuit, the output end of the analog signal counting circuit is connect with master controller.High-precision analog signal acquisition processing circuit of the invention, acquisition precision can reach one thousandth, and performance is stablized, small in size, at low cost, is applicable to various fields and uses.
Description
Technical field
The invention belongs to data acquisition technology fields, and in particular to a kind of high-precision analog signal acquisition processing circuit.
Background technique
In commercial measurement, the occasions such as application are automatically controlled, because scene and the distance between control room or controller are farther out,
When the resistance of connection electric wire is larger, if due to wire resistance and receiving dividing for instrument input resistance with voltage source signal teletransmission
Pressure, will generate biggish error, and use constant current supply signal as teletransmission, the jamproof ability comparison voltage signal of current signal
Stronger, as long as branch does not occur in transmission circuit, the electric current in circuit would not change with electric wire length, to ensure that transmission
Precision.
In environment protection field, industry spot largely uses the current signal of 4~20ma, and controller is needed to these current signals
It is converted and is acquired.Common design method is to convert the current to voltage signal, then by ADC chip to voltage signal
It is acquired, calculates.According to environmental protection equipment concerned countries standard, analog signals acquisition precision will reach 0.1%, this needs height
The ADC chip of resolution ratio, so that the cost of great number is brought, and the ADC chip of inexpensive low resolution is extremely difficult to design and wants
It asks.
Summary of the invention
Goal of the invention: the purpose of the present invention is to solve deficiencies in the prior art, provide a kind of high-precision analog letter
Number acquisition process circuit, passes through analog signal input circuit, channel selection control circuit, signal processing circuit and analog signal meter
Circuit to be calculated to combine, acquisition precision can reach one thousandth, and performance is stablized, and it is small in size, it is at low cost.
Technical solution: a kind of high-precision analog signal acquisition processing circuit of the present invention, including analog signal input
Circuit, channel selection control circuit, signal processing circuit and analog signal counting circuit, the analog signal input circuit it is defeated
Enter end and connects analog signal to be monitored, the input of the output end and channel selection control circuit of the analog signal input circuit
End connection, the output end of the channel selection control circuit and the input terminal of signal processing circuit connect, the signal processing electricity
The output end on road is connect with the input terminal of analog signal counting circuit, the output end of the analog signal counting circuit and main control
Device connection.
Further, the analog signal input circuit includes connector, and one end of the connector connects to be monitored
Analog signal, other end each unit are connect by input signal processing unit circuit with the chip in channel selection control circuit.
Further, the input signal processing unit circuit includes fuse, resistance, TVS diode and wire jumper, described
Fuse model 0ZCJ0005FF2E, TVS diode model SMBJ6.5CA.
Further, the channel selection control circuit includes CMOS analog multiplexer chip DG408DY, chip
Each input channel of DG408DY is connect with the output end of analog signal input circuit respectively, the output end and letter of chip DG408DY
The input terminal connection of number processing circuit.
Further, the signal processing circuit uses differential amplifier circuit.
Further, the signal processing circuit includes multiple operational amplifier chip OP07CS, resistance and capacitor.
Further, the analog signal counting circuit includes IC chip CS5460A, resistance and capacitor.
Further, the IC chip CS5460A is communicated using Phototube Coupling.
It further, further include isolated power supply circuit, the isolated power supply circuit includes power isolation module chip
A0512S-1WR2, three terminal regulator 78L05 and capacitor.
Further, the master controller uses STM32F407VET6 single-chip microcontroller.
The utility model has the advantages that high-precision analog signal acquisition processing circuit of the invention, using analog signal input circuit, channel
Selection control circuit, signal processing circuit and analog signal counting circuit combine, and can be acquired with collection voltages or current signal
Precision can reach one thousandth, and performance is stablized, small in size, at low cost, is applicable to various fields and uses.
Detailed description of the invention
Fig. 1 is analogue signal acquisition circuit functional block diagram of the invention；
Fig. 2 is the analog signal input circuit circuit diagram of one embodiment of the invention；
Fig. 3 is the connector J1 structural schematic diagram in analog signal input circuit of the present invention；
Fig. 4 is the channel selection control circuit circuit diagram of one embodiment of the invention；
Fig. 5 is the signal processing circuit circuit diagram of one embodiment of the invention；
Fig. 6 is the analog signal counting circuit circuit diagram of one embodiment of the invention；
Fig. 7 is the isolated power supply circuit circuit diagram of one embodiment of the invention.
Specific embodiment
Technical solution of the present invention is described in further detail combined with specific embodiments below.
As indicated with 1, a kind of high-precision analog signal acquisition processing circuit, including analog signal input electricity are invented
Road, channel selection control circuit, signal processing circuit and analog signal counting circuit, the input of the analog signal input circuit
End connects analog signal to be monitored, the output end of the analog signal input circuit and the input terminal of channel selection control circuit
Connection, the output end of the channel selection control circuit and the input terminal of signal processing circuit connect, the signal processing circuit
Output end connect with the input terminal of analog signal counting circuit, the output end and master controller of the analog signal counting circuit
Connection.
Below for one embodiment, each circuit of high-precision analog signal acquisition processing circuit of the invention is formed
Do a detailed description:
As shown in Fig. 2, being the analog signal input circuit schematic diagram of one embodiment.The analog signal input circuit includes
The connector J1 (as shown in Figure 3) of 3.81mm, one end of the connector J1 connect analog signal to be monitored, each list of the other end
First (8 groups of input unit IN0-IN7) passes through the Multipexer in input signal processing unit circuit and channel selection control circuit
Mux chip connection.
As shown in Figure 2 by taking input unit IN0 as an example, input signal processing unit circuit includes PTC self-recovery fuse
F1, resistance R4, R5 and R8, TVS diode TVS1 and wire jumper J3, wherein dangerous silk model 0ZCJ0005FF2E, TVS diode type
Number be SMBJ6.5CA.The wherein end IN0+ of an end joint connector J1 of PTC self-recovery fuse F1, PTC self-recovery fuse F1
The other end be connected separately with one end of resistance R5, resistance R4 and TVS diode TVS1, another termination wire jumper J3 of resistance R5
One end, the other end difference end IN0- of connecting connector J1 of wire jumper J3, the other end of TVS diode TVS1 and resistance R8
One end, the other end of resistance R4 connect the foot 4 (S1) of chip U6 in channel selection control circuit, the other end channel selecting of resistance R8
The foot 4 (S1) of chip U8 in control circuit.
Likewise, input signal processing unit circuit includes PTC self-recovery fuse F2 by taking input unit IN1 as an example,
Resistance R10, R12 and R14, TVS diode TVS2 and wire jumper J4, wherein dangerous silk model 0ZCJ0005FF2E, TVS diode type
Number be SMBJ6.5CA.The wherein end IN1+ of an end joint connector J1 of PTC self-recovery fuse F2, PTC self-recovery fuse F2
The other end be connected separately with one end of resistance R10, resistance R12 and TVS diode TVS2, another termination of resistance R12 is jumped
One end of line J4, the other end of wire jumper J4 distinguish the other end and resistance at the end IN1- of connecting connector J1, TVS diode TVS2
One end of R14, the other end of resistance R10 connect the foot 5 (S2) of chip U6 in channel selection control circuit, the other end of resistance R14
The foot 5 (S2) of chip U8 in channel selection control circuit.
In the present embodiment, the circuit structure of input unit IN2-IN7 is identical as the circuit structure of IN0 and IN1, specific as schemed
Shown in 2, no longer it is described in detail one by one herein.
It is illustrated in figure 4 channel selection control circuit circuit diagram, channel selection control circuit includes that two CMOS simulations are more
Path multiplexer chip DG408DY, respectively U6 and U8.It is input channel that the foot 4 of chip U6 and U8, which arrive foot 12 to foot 7 and foot 9,
It is connect respectively with the output end of each input signal processing unit circuit.Specifically, the foot 4 of chip U6 is with the resistance R4's at the end IN0
Other end connection, the other end of the resistance R10 of the foot 5 and end IN1 of chip U6 are connect, the foot 6 of chip U6 and the resistance at the end IN2
The other end of R16 connects, and the other end of the resistance R20 of the foot 7 and end IN3 of chip U6 is connect, foot 9 and the end IN7 of chip U6
The other end of resistance R45 connects, and the other end of the resistance R37 of the foot 10 and the end IN6 of chip U6 is connect, the foot 11 of chip U6 and
The other end of the resistance R33 at the end IN5 connects, and the other end of the resistance R28 of the foot 12 and end IN4 of chip U6 is connect.
In addition, the foot 4 of chip U8 is connect with the other end of the resistance R8 at the end IN0, the foot 5 of chip U8 and the resistance at the end IN1
The other end of R14 connects, and the other end of the resistance R18 of the foot 6 and end IN2 of chip U8 is connect, foot 7 and the end IN3 of chip U8
The other end of resistance R25 connects, and the other end of the resistance R47 of the foot 9 and end IN7 of chip U8 is connect, the foot 10 and IN6 of chip U8
The other end of the resistance R40 at end connects, and the other end of the resistance R35 of the foot 11 and end IN5 of chip U8 is connect, the foot 12 of chip U8
It is connect with the other end of the resistance R30 at the end IN4.
One end of foot 8 (D) the end output connection resistance R42 of chip U6, foot 8 (D) the end output connection resistance R24 of chip U8
End, resistance R42, resistance R24 the other end be connected with signal processing circuit.
As shown in figure 5, being signal processing circuit circuit diagram.Signal processing circuit is a kind of differential amplifier circuit, including
Three operational amplifier chips U7, U9 and U10, operational amplifier chip model OP07CS.Wherein the foot 3 of chip U7 is distinguished
It is connected with the other end of capacitor C30, resistance R15, one end of capacitor C31 and resistance R24, the other end of capacitor C30 connects respectively
It is connected to the other end of resistance R42 and the foot 3 of resistance R19, one end of capacitor C32 and chip U10, resistance R15, resistance R19, electricity
Hold the other end ground connection of C31 and capacitor C32.The foot 2 of chip U7 is connected separately with one end of resistance R26 and resistance R27, resistance
The other end of R26 is connected separately with the foot 6 of chip U7 and one end of resistance R21, the other end of resistance R21 are connected separately with core
The foot 2 of piece U9 and one end of resistance R22, the foot 6 of another chip termination U9 of resistance R22 are output voltage signal, output electricity
Pressure signal is connect with the input terminal of analog signal counting circuit；The other end of resistance R27 is separately connected the foot 2 and electricity of chip U10
Hinder one end of R39, the foot 6 of another chip termination U10 of resistance R39 and one end of resistance R41, the other end difference of resistance R41
Connect the foot 3 of chip U9 and one end of resistance R43, the other end ground connection of resistance R43.And the foot 7 of chip U7, U9 and U10 terminate
VEE power supply simultaneously passes through capacity earth.
As shown in fig. 6, analog signal counting circuit schematic diagram.The analog signal counting circuit mainly uses CS5460A core
Piece U12, IC chip CS5460A are communicated using Phototube Coupling, and chip CS5460A has more than 1000:1 dynamic model
It encloses.The foot 1 and foot 24 of chip U12 is connected separately with capacitor C19, C20 and crystal oscillator Y1, and the foot 3 of chip U12 connects power supply, and foot 4 connects
Ground, and capacitor C21 is connected between more than 3 foot 4 of foot, the foot 8 of chip U12 is connected in parallel to the one of capacitor C22 and C23 to foot 10
End, the other end of capacitor C22 and C23 are connected with the foot 11 and foot 12 of chip U12 jointly.The foot 17 of chip U12 passes through resistance R9
Power supply is connect, the foot 16 of chip U12 is connected in parallel to one end of resistance R54 and resistance R57, the other end ground connection of resistance R57, resistance
The other end of another terminating resistor R22 of R54 and the foot 6 of chip U9.The foot 5 of chip U12 arrives foot 7, foot 19, foot 20 and foot 23
It is connected with the corresponding pin of master controller.
Signal interference in order to prevent preferably uses isolated power supply circuit in the present embodiment.As shown in fig. 7, the isolation is electric
Source circuit includes power isolation module chip A0512S-1WR2 (chip U1), three terminal regulator 78L05 and several capacitors.Wherein
The foot 1 of chip U1 is grounded by capacitor C3, and foot 2 is directly grounded, and foot 4 meets the end-VEE and capacitor C9 and capacitor C8 (tantalum electricity respectively
Hold) one end, the other end of capacitor C9 and capacitor C8 (tantalum capacitor) be grounded respectively and connects the foot 5, the capacitor C10 that connect chip U1
The foot 6 and+VEE of another chip termination U1 of one end of (tantalum capacitor) and capacitor C11, capacitor C10 (tantalum capacitor) and capacitor C11
It holds, one end of the foot 3 of three terminal regulator 78L05, capacitor C5 and capacitor C6, the other end ground connection of capacitor C5 and capacitor C6.Three ends
The foot 2 of voltage-stablizer 78L05 is grounded, and the foot 1 of three terminal regulator 78L05 is separately connected one end of capacitor C4 (tantalum capacitor) and capacitor C7
And the end VCC, the other end ground connection of capacitor C4 and capacitor C7.
High-precision analog signal acquisition processing circuit of the invention is controlled using analog signal input circuit, channel selecting
Circuit, signal processing circuit and analog signal counting circuit combine, and acquisition precision can reach one thousandth, and performance is stablized,
It is small in size, it is at low cost, it is applicable to various fields and uses.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of high-precision analog signal acquisition processing circuit, it is characterised in that: including analog signal input circuit, channel selecting
Control circuit, signal processing circuit and analog signal counting circuit, the input terminal of the analog signal input circuit are connected wait supervise
The analog signal of survey, the output end of the analog signal input circuit and the input terminal of channel selection control circuit connect, described
The output end of channel selection control circuit and the input terminal of signal processing circuit connect, the output end of the signal processing circuit with
The input terminal of analog signal counting circuit connects, and the output end of the analog signal counting circuit is connect with master controller.
2. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: the simulation letter
Number input circuit includes connector, and one end of the connector connects analog signal to be monitored, and other end each unit passes through defeated
Enter signal processing circuit unit to connect with the chip in channel selection control circuit.
3. a kind of high-precision analog signal acquisition processing circuit according to claim 2, it is characterised in that: the input letter
Number processing unit circuit includes fuse, resistance, TVS diode and wire jumper, the fuse model 0ZCJ0005FF2E,
TVS diode model SMBJ6.5CA.
4. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: the channel choosing
Select control circuit include CMOS analog multiplexer chip DG408DY, chip DG408DY each input channel respectively with simulation
The output end of signal input circuit connects, and the output end of chip DG408DY and the input terminal of signal processing circuit connect.
5. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: at the signal
It manages circuit and uses differential amplifier circuit.
6. a kind of high-precision analog signal acquisition processing circuit according to claim 1 or 5, it is characterised in that: the letter
Number processing circuit includes multiple operational amplifier chip OP07CS, resistance and capacitor.
7. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: the simulation letter
Number counting circuit includes IC chip CS5460A, resistance and capacitor.
8. a kind of high-precision analog signal acquisition processing circuit according to claim 7, it is characterised in that: the integrated electricity
Road chip CS5460A is communicated using Phototube Coupling.
9. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: further include isolation
Power circuit, the isolated power supply circuit include power isolation module chip A0512S-1WR2, three terminal regulator 78L05 and
Capacitor.
10. a kind of high-precision analog signal acquisition processing circuit according to claim 1, it is characterised in that: the master control
Device processed uses STM32F407VET6 single-chip microcontroller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334287.4A CN110032114A (en) | 2019-04-24 | 2019-04-24 | A kind of high-precision analog signal acquisition processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910334287.4A CN110032114A (en) | 2019-04-24 | 2019-04-24 | A kind of high-precision analog signal acquisition processing circuit |
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| CN110032114A true CN110032114A (en) | 2019-07-19 |
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| CN201910334287.4A Pending CN110032114A (en) | 2019-04-24 | 2019-04-24 | A kind of high-precision analog signal acquisition processing circuit |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10303656A (en) * | 1997-04-24 | 1998-11-13 | Toshiba Microelectron Corp | Analog signal selection circuit |
| CN202331914U (en) * | 2011-11-30 | 2012-07-11 | 东北石油大学秦皇岛分校 | Multichannel analog quantity collection device |
| CN202748658U (en) * | 2012-08-22 | 2013-02-20 | 石家庄铁路职业技术学院 | Ethernet multi-path data acquisition device |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN106996847A (en) * | 2017-05-02 | 2017-08-01 | 贵州航天电器股份有限公司 | A kind of multi-path pressure acquisition system |
| CN207099056U (en) * | 2017-08-08 | 2018-03-13 | 湖北三江航天红峰控制有限公司 | A kind of multi-channel data acquisition front end biasing circuit |
| CN109062095A (en) * | 2018-07-27 | 2018-12-21 | 杭州电子科技大学 | A kind of high-precision multi-channel data acquisition board and acquisition method |
| CN209447024U (en) * | 2019-04-24 | 2019-09-27 | 江苏泰坤环保科技有限公司 | A kind of high-precision analog signal acquisition processing circuit |
-
2019
- 2019-04-24 CN CN201910334287.4A patent/CN110032114A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10303656A (en) * | 1997-04-24 | 1998-11-13 | Toshiba Microelectron Corp | Analog signal selection circuit |
| CN202331914U (en) * | 2011-11-30 | 2012-07-11 | 东北石油大学秦皇岛分校 | Multichannel analog quantity collection device |
| CN202748658U (en) * | 2012-08-22 | 2013-02-20 | 石家庄铁路职业技术学院 | Ethernet multi-path data acquisition device |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN106996847A (en) * | 2017-05-02 | 2017-08-01 | 贵州航天电器股份有限公司 | A kind of multi-path pressure acquisition system |
| CN207099056U (en) * | 2017-08-08 | 2018-03-13 | 湖北三江航天红峰控制有限公司 | A kind of multi-channel data acquisition front end biasing circuit |
| CN109062095A (en) * | 2018-07-27 | 2018-12-21 | 杭州电子科技大学 | A kind of high-precision multi-channel data acquisition board and acquisition method |
| CN209447024U (en) * | 2019-04-24 | 2019-09-27 | 江苏泰坤环保科技有限公司 | A kind of high-precision analog signal acquisition processing circuit |
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