CN106645913A - Voltage acquisition device - Google Patents
Voltage acquisition device Download PDFInfo
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- CN106645913A CN106645913A CN201710117681.3A CN201710117681A CN106645913A CN 106645913 A CN106645913 A CN 106645913A CN 201710117681 A CN201710117681 A CN 201710117681A CN 106645913 A CN106645913 A CN 106645913A
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- 238000005070 sampling Methods 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
Abstract
The invention discloses a voltage acquisition device. The voltage acquisition device is provided with a protecting unit, a differential unit, a master control unit, an alarming unit and a power supply unit, wherein the input end of the protecting unit is connected to a voltage of a voltage sampling point, and the output end of the protecting unit is connected to the input end of the differential unit; the output end of the differential unit is connected to the input end of a data sampling unit to generate differentiated sampling data; the output end of the data sampling unit is connected to the data input end of the master control unit to output the sampling data to the master control unit to be processed; the first control end of the master control unit is connected to the controlled end of the alarming unit; the first power supply output end of the power supply unit is connected to the power supply input end of the differential unit, and the second power supply output end of the power supply unit is connected to the power supply input end of the master control unit. According to the scheme, the input impedance of the detection input end can be improved, so that the detecting inaccuracy due to division of the detected voltage can be avoided, and customized setting of the sampling rate can be realized.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of voltage collecting device.
Background technology
For various electronic electric equipments, need to detect the index performance of equipment in process of production；In equipment
Running in, in order to ensure the safe and effective operation of equipment, the various electric parameters in needing to running are supervised
Control, such as voltage.
In the prior art, voltage is sampled frequently with the mode of partial pressure detection, this sample mode is to high input
Impedance is unable to efficiently sampling, and the precision and frequency (mostly 10Hz) of sampling all than relatively low.
The content of the invention
The invention provides a kind of voltage collecting device, solving in prior art can not effectively adopt to high input impedance
Sample, the accuracy and speed of sampling is all than relatively low problem.
To realize above-mentioned design, the present invention is employed the following technical solutions：
A kind of voltage collecting device, including protection location, difference unit, main control unit, Alarm Unit and power subsystem；
The input of the protection location accesses the voltage of voltage sample point, the output end of the protection location and the difference
The input of subdivision is connected；
The output end of the difference unit is connected with the input of the data sampling unit, and differentiated voltage is defeated
Go out to the data sampling unit and generate sampled data；
The output end of the data sampling unit is connected with the data input pin of the main control unit, by the hits
Processed to the main control unit according to output；
First control end of the main control unit is connected with the controlled end of the Alarm Unit；
First power output end of the power subsystem is connected with the power input of the difference unit, the power supply list
The second source output end of unit is connected with the power input of the main control unit.
Wherein, also including communication unit, the data transfer of the data transmission terminal of the communication unit and the main control unit
End is connected；3rd power output end of the power subsystem is connected with the power input of the communication unit.
Wherein, also including passage switch unit, multiple inputs of the passage switch unit are respectively connected to described in one
Voltage sample point, the output end of the passage switch unit is connected with the input of the protection location, and the passage switching is single
The controlled end of unit is connected with according to the voltage sample of control instruction switched conductive with the second control end of the main control unit
Point.
Wherein, the conducting between the input and the output end of the passage switch unit is by optocoupler control.
Wherein, the protection location includes a piezo-resistance and a self-healing NTC insurance, the piezo-resistance with
The NTC insurances series connection.
Wherein, model MOV330 of the piezo-resistance.
Wherein, the Alarm Unit includes node alarm, an external I/O port and a LED warning light.
Wherein, the data sampling unit includes fiducial chip U28, electric capacity C15, the operation amplifier of model REF5025
Device U33, resistance R38, resistance R39 and resistance R40；The pin 2 and pin 4 of the fiducial chip U28 respectively with the electric capacity C15
First end be connected with the second end；The pin 6 of the fiducial chip U28 is connected with the first end of the resistance R38, the resistance
38 the second end is connected with the first end of the resistance R39 and the pin IN+ of operational amplifier U33, and the of the resistance R39
Two ends are connected with the first end of the resistance R40, the second termination simulation ground of the resistance 40.
Wherein, the capacitance of the electric capacity C15 is 1 μ F, and the resistance of the resistance R38 is 100K Ω, the resistance R39's
Resistance is 20K Ω, and the resistance of the resistance R40 is 20K Ω.
Wherein, the communication unit is the ADM2483 chips with isolation.
Beneficial effects of the present invention are：By arranging voltage collecting device, including protection location, difference unit, master control list
Unit, Alarm Unit and power subsystem；The input of protection location accesses the voltage of voltage sample point, the output end of protection location with
The input of difference unit is connected；The output end of difference unit is connected with the input of data sampling unit, will be differentiated
Voltage output to data sampling unit generates sampled data；The output end of data sampling unit and the data input pin of main control unit
It is connected, sampled data output is processed to main control unit；First control end of main control unit is controlled with Alarm Unit
End is connected；First power output end of power subsystem is connected with the power input of difference unit, the second source of power subsystem
Output end is connected with the power input of main control unit；The program can improve the input impedance of detection input, so can
Avoid tested voltage from being after partial pressure and cause detection inaccurate, the self-defined setting to sample rate can be realized.
Description of the drawings
Technical scheme in order to be illustrated more clearly that the embodiment of the present invention, below will be to institute in embodiment of the present invention description
The accompanying drawing that needs are used is briefly described, it should be apparent that, drawings in the following description are only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to present invention enforcement
The content of example and these accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of block diagram of the voltage collecting device provided in the specific embodiment of the invention；
Fig. 2 is a kind of part electricity of the data acquisition unit of the voltage collecting device provided in the specific embodiment of the invention
Road schematic diagram；
Fig. 3 is a kind of node alarm of the Alarm Unit of the voltage collecting device provided in the specific embodiment of the invention
Output circuit schematic diagram；
Fig. 4 is that a kind of switch of the passage switch unit of the voltage collecting device provided in the specific embodiment of the invention is cut
Change circuit theory diagrams.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to the specific embodiment according to voltage collecting device proposed by the present invention, feature and its effect, in detail
Describe in detail bright as after.
Fig. 1 to Fig. 4 is refer to, Fig. 1 is a kind of structure of the voltage collecting device provided in the specific embodiment of the invention
Block diagram；Fig. 2 is a kind of part electricity of the data acquisition unit of the voltage collecting device provided in the specific embodiment of the invention
Road schematic diagram；Fig. 3 is a kind of node alarm of the Alarm Unit of the voltage collecting device provided in the specific embodiment of the invention
Output circuit schematic diagram；Fig. 4 is that a kind of passage switching of the voltage collecting device provided in the specific embodiment of the invention is single
The switch switching circuit schematic diagram of unit.As shown in figure 1, the voltage collecting device, including protection location 101, difference unit 102,
Main control unit 104, Alarm Unit 106 and power subsystem 105；
The input of protection location 101 accesses the voltage of voltage sample point, the output end and difference unit of protection location 101
102 input is connected；
The output end of difference unit 102 is connected with the input of data sampling unit 103, by differentiated voltage output
Sampled data is generated to data sampling unit 103；
The output end of data sampling unit 103 is connected with the data input pin of main control unit 104, and sampled data is exported
Processed to main control unit 104；
First control end of main control unit 104 is connected with the controlled end of Alarm Unit 106；
First power output end of power subsystem 105 is connected with the power input of difference unit 102, power subsystem 105
Second source output end be connected with the power input of main control unit 104.
In this programme, communication unit 108, the data transmission terminal and main control unit of communication unit 108 are further comprised
104 data transmission terminal is connected；3rd power output end of power subsystem 105 is connected with the power input of communication unit 108.
Communication unit 108 can select the ADM2483 chips with isolation.
In addition, also including passage switch unit 107, multiple inputs of passage switch unit 107 are respectively connected to an electricity
Pressure sampled point, the output end of passage switch unit 107 is connected with the input of protection location 101, and passage switch unit 107 is received
Control end is connected with according to the voltage sample of control instruction switched conductive point with the second control end of main control unit 104.
In this programme, main control unit 104 can adopt the MSP430F149 of 16 as main control chip；Difference unit
102 can adopt high-performance difference chip I NA118 as the difference of voltage sample input stage；Data sampling unit 103 includes one
Individual reference voltage bleeder circuit, the simulation numeral of voltage follower circuit, a reference circuit and a high speed 24 turn
Chip is changed, Analog-digital Converter chip model is LTC2440；Voltage collecting device in the present embodiment passes through communication unit 108
Communicated with host computer；Power subsystem 105 uses the DC-DC power source of 3 isolations, a power supply that 5V is turned for 24V
Module, a power module that ± 12V is turned for positive 5V, a power module that 5V is turned for 5V.
Protection location 101 is connected with difference unit 102, and difference unit 102 is directly connected with data sampling unit 103, uses
In being acquired to voltage signal, data sampling unit 103 is connected with main control unit 104, and the data changed directly are sent back to
Data processing and analysis are carried out to main control unit 104, switch element, Alarm Unit 106 and communication unit 108 are all directly accessed master
In control unit 104.The purpose of difference can be to improve the input impedance of detection input, can so avoid tested voltage from being Jing
Cross after partial pressure and cause detection inaccurate.Voltage in access system reaches 24 A/D at a high speed after Differential Input, directly
Analog-to-digital chip, the reference voltage that the chip is used in detection conversion is produced by fiducial chip REF5025P, the core
The reference voltage that piece is produced enters after reference voltage is carried out voltage division processing by resistor voltage divider circuit through an operational amplifier
It is connected with A/D Analog-digital Converter chips after row voltage follow, the conversion speed can be controlled by main control unit 104,
Control to chip conversion speed is realized by the level of the conversion speed controlling switch of change A/D modulus conversion chips, this time
Design can realize altogether the regulation of 7 kinds of conversion speeds.
Between the concrete handoff procedure of passage switch unit 107, the input and output end of passage switch unit 107
Conducting is by optocoupler control.
In specific enforcement, protection location 101 includes a piezo-resistance and a self-healing NTC insurance, pressure-sensitive
Resistance is connected with NTC insurances.The model of piezo-resistance can select MOV330.
NTC (Negative Temperature Coefficient) is referred to be had exponent relation with temperature rising resistance and subtracted
Little, the thermistor phenomenon with negative temperature coefficient and material.In this programme, for example, voltage detecting is carried out to battery, when having
After battery is accessed, the damage of corresponding components and parts is caused in order to prevent high voltage from accessing, now piezo-resistance and NTC insure just
Can in time disconnect, protect components and parts below not damaged by high pressure.
To realize various alarm demands, Alarm Unit 106 includes a node alarm, an external I/O port and one
LED warning lights.
Circuit aspect is embodied, as shown in Fig. 2 data sampling unit 103 includes the benchmark core of model REF5025
Piece U28, electric capacity C15, operational amplifier U33, resistance R38, resistance R39 and resistance R40；The pin 2 of fiducial chip U28 and pin
4 are connected respectively with the first end of electric capacity C15 and the second end；The pin 6 of fiducial chip U28 is connected with the first end of resistance R38, electricity
Resistance 38 the second end be connected with the first end of resistance R39 and the pin IN+ of operational amplifier U33, second end of resistance R39 and
The first end of resistance R40 is connected, and the second termination simulation ground of resistance 40, this partial circuit is mainly used in generating reference voltage.
Reference voltage is mainly produced by fiducial chip REF5025, and the reference voltage of generation is through resistance R38, resistance R39 and resistance R40
Partial pressure is carried out, the voltage after partial pressure becomes after the voltage follower circuit that the operational amplifier U33 of model OP01 is constituted
The reference voltage of 0.6V, then the reference voltage be directly connected to the reference pin of A/D analog-converted chip TLC2440, to A/D
Conversion chip provides the reference voltage of conversion work.
Wherein, the capacitance of electric capacity C15 is 1 μ F, and the resistance of resistance R38 is 100K Ω, and the resistance of resistance R39 is 20K Ω,
The resistance of resistance R40 is 20K Ω.
As shown in figure 3, the output circuit of node alarm includes optocoupler (optocoupler U29 and the optocoupler of two models AQY212S
U32), when electric voltage exception is detected, main control unit 104 drives optocoupler closure, i.e., K11 is connected with K12, and K21 is connected with K22.
Passage switch unit 107 is defaulted as 12 passages, you can with while carrying out voltage detecting to 12 voltage sample points.Such as
Shown in Fig. 4, two optocouplers constitute the switch of a passage, and a light couples the positive pole of voltage, another light coupling voltage
Negative pole, thus, 12 passages are just made up of such 24 optocouplers, and by main control unit 104 optocoupler of 12 passages is controlled, from
And realize the switching of 12 passages.Certainly, optocoupler can access protective resistance (such as resistance R35, resistance R36, resistance R1 and resistance
R2)。
The following is the specific descriptions of the operation principle to voltage collecting device.Bring into operation after electricity on voltage collecting device,
The sampling rate given tacit consent to after initializing after upper electricity is 55Hz, and collection voltages port number is 12, can now pass through communication unit 108
Connection upper computer software carries out real-time monitoring and the storage of data, while can be carried out to device parameter by communication unit 108
Arrange, the parameter that can be arranged has a setting of device sampling rate, the setting of collection voltages passage and device is calibrated etc..
Device is started working, and fiducial chip produces a reference voltage, and reference voltage passes through again operational amplifier after electric resistance partial pressure
Carry out being supplied directly to modulus conversion chip after voltage follow to use as conversion reference voltage, main control unit 104 is directly controlled
Optocoupler carries out the selection of the passage of access system, and according to default setting, the sense channel that device starts is 12, now master control list
Unit 104 controls optocoupler and carries out the opening one by one of 12 passages, and each passage is controlled by two optocouplers, an optocoupler control
The positive pole of voltage, the negative pole of another optocoupler control voltage, when a passage is opened, other all of passages are all
Closed mode, all passages of the meeting of main control unit 104 real-time monitoring, if there is two passages, simultaneously device for opening can be carried out
LED is alerted, and device is opened after a passage, and accessing the voltage of the passage will enter into device, first voltage need through
Protection location 101, then carries out voltage differential through difference unit 102, and differentiated voltage enters into A/D modulus conversion chips
Input, changed according to the translative mode of current setting, data are sent to main control unit 104 after converting and enter line number
According to process, data of the data processing mainly to collecting carry out storage to corresponding register, the number of each channel acquisition
All it is real-time update according to there is fixed register to carry out the data in data storage, and the register, by the number
According to being processed, whether the voltage data is detected beyond the alarming threshold value for setting, if it exceeds the alarming threshold value of setting, dress
The LED alarm put, node alarm and reserved external I/O mouths can all carry out corresponding alarming processing, mainly be shown as accusing
The red light of warning lamp can be lighted, and node alarm end can close, and external I/O mouths can become high level, high level output to it is corresponding outward
Portion's equipment carries out other necessary controls or record.
The above, is only presently preferred embodiments of the present invention, and any pro forma restriction is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, in the range of without departing from technical solution of the present invention, when making a little change or modification using the technology contents of the disclosure above
For the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to the technical spirit pair of the present invention
Any simple modification, equivalent variations and modification that above example is made, still fall within the range of technical solution of the present invention.
Claims (10)
1. a kind of voltage collecting device, it is characterised in that including protection location, difference unit, main control unit, data sampling list
Unit, Alarm Unit and power subsystem；
The input of the protection location accesses the voltage of voltage sample point, the output end of the protection location and the difference list
The input of unit is connected；
The output end of the difference unit is connected with the input of the data sampling unit, and differentiated voltage output is arrived
The data sampling unit generates sampled data；
The output end of the data sampling unit is connected with the data input pin of the main control unit, and the sampled data is defeated
Go out to the main control unit and processed；
First control end of the main control unit is connected with the controlled end of the Alarm Unit；
First power output end of the power subsystem is connected with the power input of the difference unit, the power subsystem
Second source output end is connected with the power input of the main control unit.
2. voltage collecting device according to claim 1, it is characterised in that also including communication unit, the communication unit
Data transmission terminal be connected with the data transmission terminal of the main control unit；3rd power output end of the power subsystem with it is described
The power input of communication unit is connected.
3. voltage collecting device according to claim 1, it is characterised in that also including passage switch unit, the passage
Multiple inputs of switch unit are respectively connected to a voltage sample point, the output end of the passage switch unit with it is described
The input of protection location is connected, the controlled end of the passage switch unit be connected with the second control end of the main control unit with
According to the voltage sample point of control instruction switched conductive.
4. voltage collecting device according to claim 3, it is characterised in that the input of the passage switch unit and institute
The conducting between output end is stated by optocoupler control.
5. voltage collecting device according to claim 1, it is characterised in that the protection location includes a piezo-resistance
NTC insurances self-healing with one, the piezo-resistance is connected with NTC insurances.
6. voltage collecting device according to claim 5, it is characterised in that model MOV330 of the piezo-resistance.
7. voltage collecting device according to claim 1, it is characterised in that the Alarm Unit includes that a node is accused
An alert, external I/O port and a LED warning light.
8. voltage collecting device according to claim 1, it is characterised in that the data sampling unit includes model
The fiducial chip U28 of REF5025, electric capacity C15, operational amplifier U33, resistance R38, resistance R39 and resistance R40；The benchmark
The pin 2 and pin 4 of chip U28 is connected respectively with the first end of the electric capacity C15 and the second end；The fiducial chip U28's
Pin 6 is connected with the first end of the resistance R38, the first end and fortune of the second end of the resistance 38 and the resistance R39
The pin IN+ for calculating amplifier U33 is connected, and second end of the resistance R39 is connected with the first end of the resistance R40, the electricity
Second termination simulation ground of resistance 40.
9. voltage collecting device according to claim 8, it is characterised in that the capacitance of the electric capacity C15 is 1 μ F, institute
The resistance for stating resistance R38 is 100K Ω, and the resistance of the resistance R39 is 20K Ω, and the resistance of the resistance R40 is 20K Ω.
10. voltage collecting device according to claim 2, it is characterised in that the communication unit is with isolation
ADM2483 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117681.3A CN106645913A (en) | 2017-03-01 | 2017-03-01 | Voltage acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117681.3A CN106645913A (en) | 2017-03-01 | 2017-03-01 | Voltage acquisition device |
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| CN106645913A true CN106645913A (en) | 2017-05-10 |
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| CN201710117681.3A Pending CN106645913A (en) | 2017-03-01 | 2017-03-01 | Voltage acquisition device |
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Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627624A (en) * | 2018-04-17 | 2018-10-09 | 上海艾晟特环保科技有限公司 | A kind of the pH signal conditions transmission circuit and water quality real-time monitoring system of extremely low power dissipation |
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Application publication date: 20170510 |