CN106324333A - High-precision voltage measuring device - Google Patents
High-precision voltage measuring device Download PDFInfo
- Publication number
- CN106324333A CN106324333A CN201610757045.2A CN201610757045A CN106324333A CN 106324333 A CN106324333 A CN 106324333A CN 201610757045 A CN201610757045 A CN 201610757045A CN 106324333 A CN106324333 A CN 106324333A
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- Prior art keywords
- signal
- voltage measuring
- measuring apparatus
- digital signal
- control module
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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
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a high-precision voltage measuring device, comprising a programmable amplifier, an analog-digital conversion module, a control module and a display module, wherein the programmable amplifier is used for receiving and amplifying a first analog signal from an industrial site, and outputting a corresponding second analog signal; the analog-digital conversion module is used for converting the second analog signal into a digital signal; the control module is used for processing the digital signal; and the display module is used for displaying the digital signal. The programmable amplifier further comprises a channel selection unit, which is used for selecting a corresponding range gear and carrying out amplification according to the range gear. Compared with the prior art, the voltage measuring device has the advantages that the channel selection unit can select an appropriate range gear for amplifying for analog voltage signals transmitted on site via a multi-channel selection switch, and the analog-digital conversion module converts the amplified analog signals into digital signals, thereby improving the measuring precision of the whole device, improving the signal-to-noise ratio and enhancing the anti-interference capability of measured signals.
Description
Technical field
The present invention relates to a kind of detection field automatically, particularly relate to a kind of high-precision voltage measuring apparatus.
Background technology
In design of electronic circuits, it is often necessary to amplify faint direct current signal or slowly varying signal.Common collection
Become operational amplifier while amplifying signal owing to being affected by factors such as variations in temperature, supply voltage shakinesses, will appear from electricity
The phenomenon that road output end voltage deviates former fixed value and floats up and down, i.e. null offset, this phenomenon is with the amplification of amplifier
Increase can increase substantially.Therefore, improve amplification, reduction null offset is the main lance needing in engineering practice to solve
Shield.Although using chopper amplifier can preferably improve problem above, but solution of the prior art being at temperature and noise
Etc. aspect yet suffer from many shortcomings and deficiencies.
Summary of the invention
For the drawbacks described above existing for tension measuring circuit of the prior art, the invention provides a kind of high-precision
Voltage measuring apparatus, is melted into a whole high accuracy, low noise with low cost, it is achieved the automatic collection of weak voltage signals, for rear
Platform decision-making provides foundation.
According to one aspect of the present invention, it is provided that a kind of high-precision voltage measuring apparatus, including:
Programmable amplifier, for receiving and amplify the first analogue signal from industry spot, and exports and described first
The second analogue signal that analogue signal is corresponding；
Analog-to-digital conversion module, couples mutually with the outfan of described programmable amplifier, for described second analogue signal being turned
It is changed to digital signal；
Control module, couples mutually with described analog-to-digital conversion module, for the numeral letter from described analog-to-digital conversion module
Number process, export treated digital signal；And
Display module, is connected with described control module, for showing the described digital signal from described control module,
Wherein, described programmable amplifier also includes a channel selection unit, and described control module is according to described digital signal
With the comparison result between corresponding amplitude range is confirmed whether to export a range switching signal, described channel selection unit according to
Described range switching signal selects corresponding range gear so that described programmable amplifier according to selected range gear to institute
State the first analogue signal to be amplified.
At a specific embodiment, during described voltage measuring apparatus electrification reset, the range that described channel selection unit selects
Gear is the most high-grade.
At a specific embodiment, when the amplitude range that described digital signal is corresponding mates with current range gear, institute
State display module shown by described digital signal and store；When amplitude range corresponding to described digital signal and current amount
When journey gear does not mates, described control module exports described range switching signal so that described channel selection unit switches to new
Range gear.
At a specific embodiment, described control module is ARM chip, and described ARM chip has SPI interface, by described
SPI interface reads the described digital signal from described analog-to-digital conversion module.
At a specific embodiment, described voltage measuring apparatus also includes power module, and it has two TPS73XX series
Power supply chip, for the supply voltage of the different numerical value of output respectively.
At a specific embodiment, described voltage measurement module also includes external memory storage, is connected with described control module,
For storing the various operational factors of described digital signal and described voltage measuring apparatus.
At a specific embodiment, described channel selection unit is the four analog switch multiplexers selecting.
At a specific embodiment, described voltage measuring apparatus also includes signal processing module, is arranged at described analog digital conversion
Between module and described control module, for described digital signal is filtered, and filtered digital signal is sent into institute
State control module.
At a specific embodiment, described signal processing module uses bubble sort and median averagely to described numeral letter
Number it is filtered.
At a specific embodiment, described voltage measuring apparatus also includes input keyboard, couples mutually with described control module, uses
In manually selecting desired range gear or carrying out parameter setting operation.
Using the high-precision voltage measuring apparatus of the present invention, it includes programmable amplifier, analog-to-digital conversion module, control mould
Block and display module.Programmable amplifier receives and amplifies from the first analogue signal of industry spot the second mould of exporting correspondence
Intending signal, the second analogue signal is converted to digital signal by analog-to-digital conversion module, and control module is to from analog-to-digital conversion module
Digital signal processes, and display module is for showing the digital signal from control module.Wherein, programmable amplifier also includes
One channel selection unit, control module is confirmed whether output according to the comparison result between digital signal and the amplitude range of correspondence
One range switching signal, then channel selection unit selects corresponding range gear according to range switching signal so that program control put
First analogue signal is amplified by big device according to selected range gear.Compared to prior art, the passage choosing of the present invention
Selecting unit can select suitable range gear to be amplified by the analog voltage signal that scene is transmitted by multidiameter option switch, and
Analogue signal after utilizing analog-to-digital conversion module to amplify is converted to digital signal, thus promotes the certainty of measurement of whole device,
Improve signal to noise ratio and strengthen the capacity of resisting disturbance measuring signal.Additionally, the signal processing module of the present invention based on bubble sort and
The combination type algorithm of median average filter, it is possible to overcome the arteries and veins caused in field, actual industrial scene due to a certain accidentalia
Punching property is disturbed, and eliminates the sampling deviation caused by impulse disturbances, thus obtains preferable measurement effect.
Accompanying drawing explanation
Reader is after the detailed description of the invention having read the present invention referring to the drawings, it will more clearly understand the present invention's
Various aspects.Wherein,
Fig. 1 is shown according to the structural representation of the high-precision voltage measuring apparatus of an embodiment of the present invention；And
Fig. 2 illustrates when the programmable amplifier in the voltage measuring apparatus of Fig. 1 switches between different range gears
View.
Detailed description of the invention
In order to make techniques disclosed in this application content more detailed and complete, can refer to the following of accompanying drawing and the present invention
Various specific embodiments, labelling identical in accompanying drawing represents same or analogous assembly.But, those of ordinary skill in the art
Should be appreciated that embodiment provided hereinafter is not for limiting the scope that the present invention is contained.Additionally, accompanying drawing is used only for
Schematically it is illustrated, and draws not according to its life size.
With reference to the accompanying drawings, the detailed description of the invention of various aspects of the present invention is described in further detail.
Fig. 1 is shown according to the structural representation of the high-precision voltage measuring apparatus of an embodiment of the present invention, and Fig. 2 illustrates
View when programmable amplifier in the voltage measuring apparatus of Fig. 1 switches between different range gears.
With reference to Fig. 1, in this embodiment, the voltage measuring apparatus of the present invention mainly includes that programmable amplifier 1, modulus turn
Die change block (A/D conversion) 2, control module 3 and display module 4.
Specifically, programmable amplifier 1 for receiving and amplify the first analogue signal from industry spot, and export with
The second analogue signal that first analogue signal is corresponding.Analog-to-digital conversion module 2 couples mutually with the outfan of programmable amplifier 1.Mould
Number conversion module 2 is for being converted to digital signal by the second analogue signal.Control module 3 couples with analog-to-digital conversion module 2 phase, uses
In the digital signal from analog-to-digital conversion module 2 is processed, export treated digital signal.Display module 4 and control
Module 3 is connected, for showing the described digital signal from control module 3.Further, programmable amplifier 1 also includes a passage
Selecting unit (not shown), control module 3 according to the comparison result confirmation between digital signal and the amplitude range of correspondence is
No output one range switching signal, channel selection unit selects corresponding range gear according to range switching signal so that program control
First analogue signal is amplified by amplifier 1 according to selected range gear.
At a specific embodiment, the voltage measuring apparatus of the present invention also includes signal processing module 5.Signal processing module 5
It is arranged between analog-to-digital conversion module 2 and control module 3, for digital signal is filtered, and by filtered numeral letter
Number send into control module 3.It is preferred that signal processing module 5 uses knockdown digital filtering algorithm to realize digital signal
Filter function.Such as, combinations thereof formula filtering algorithm includes Bubble Sort Algorithm and median average filter algorithm.Use this
The combination type algorithm of sample, it is possible to overcome the pulse feature interference caused due to a certain accidentalia in field, actual industrial scene, disappear
Except the sampled value deviation caused by impulse disturbances, reach preferable measurement effect.
At a specific embodiment, the voltage measuring apparatus of the present invention also includes input keyboard 6, couples with control module 3 phase,
For manually selecting desired range gear or carrying out parameter setting operation so that can be by user oneself during experience emergency
The function of control system is to complete to control operation accordingly.
Additionally, control module 3 can be ARM chip (such as STM32F407 family chip), this ARM chip has spi bus
Interface, reads the digital signal from analog-to-digital conversion module 2 by this spi bus interface.Further, display module 4 is by ARM core
The FSMC function of sheet communicates, thus shows the running status of whole device and current measurement voltage in real time.It addition, this electricity
Pressure measuring device also includes power module, and it has the power supply chip of two TPS73XX series, for the different numerical value of output respectively
Supply voltage, meet the use requirement to voltage of the different modules.Furthermore, this voltage measurement module may also include outside storage
Device, is connected with control module 3, for storing the various operational factors of digital signal and device, not only meets commercial production mistake
For the requirement of big data quantity operation in journey, but also the data measured can be preserved in case using or checking.
With reference to Fig. 2 and Fig. 1, such as, channel selection unit is the four analog switch multiplexers selecting, at the mould of input
Intend carrying out suitable measurement range selection when voltage signal is exaggerated process.Control module 3 is when executive control operation, if digital signal
Corresponding amplitude range mates with current range gear, then need not output range switching signal, display module 4 is by digital signal
Show；If the amplitude range that digital signal is corresponding does not mates with current range gear, then control module 3 output range is cut
Change signal so that channel selection unit switches to new range gear.Additionally, after system power-on reset, the gear acquiescence of range
Select in maximum, so can avoid because measuring the sudden change of signal, system itself being damaged.
For avoiding the disturbance measuring voltage to cause range ability frequently to switch, when system works, range switching signal is adopted
Mode with voltage delay transmission.When input signal is by low rising, system is corresponding to the input electricity of a circuit state conversion
Pressure value, when voltage declines, system is corresponding to the input voltage value of another circuit state conversion, the two magnitude of voltage not phase
With.For example, if current range gear is in 0～1V, when voltage raises and is higher than 1.5V, control module output range
Switching signal thus channel selection unit is switched to second gear 1～10V.If input voltage afterwards declines, when dropping to
The when of 1.5V, current range gear does not switch over, but the when that voltage continuing to drop below 1V by the time, controls
Module just output range switching signal thus channel selection unit is switched back to first grade 0～1V.
Using the high-precision voltage measuring apparatus of the present invention, it includes programmable amplifier, analog-to-digital conversion module, control mould
Block and display module.Programmable amplifier receives and amplifies from the first analogue signal of industry spot the second mould of exporting correspondence
Intending signal, the second analogue signal is converted to digital signal by analog-to-digital conversion module, and control module is to from analog-to-digital conversion module
Digital signal processes, and display module is for showing the digital signal from control module.Wherein, programmable amplifier also includes
One channel selection unit, control module is confirmed whether output according to the comparison result between digital signal and the amplitude range of correspondence
One range switching signal, then channel selection unit selects corresponding range gear according to range switching signal so that program control put
First analogue signal is amplified by big device according to selected range gear.Compared to prior art, the passage choosing of the present invention
Selecting unit can select suitable range gear to be amplified by the analog voltage signal that scene is transmitted by multidiameter option switch, and
Analogue signal after utilizing analog-to-digital conversion module to amplify is converted to digital signal, thus promotes the certainty of measurement of whole device,
Improve signal to noise ratio and strengthen the capacity of resisting disturbance measuring signal.Additionally, the signal processing module of the present invention based on bubble sort and
The combination type algorithm of median average filter, it is possible to overcome the arteries and veins caused in field, actual industrial scene due to a certain accidentalia
Punching property is disturbed, and eliminates the sampling deviation caused by impulse disturbances, thus obtains preferable measurement effect.
Above, the detailed description of the invention of the present invention is described with reference to the accompanying drawings.But, those skilled in the art
It is understood that in the case of without departing from the spirit and scope of the present invention, it is also possible to the detailed description of the invention of the present invention is made each
Plant change and replace.These changes and replacement all fall in claims of the present invention limited range.
Claims (10)
1. a high-precision voltage measuring apparatus, it is characterised in that described voltage measuring apparatus includes:
Programmable amplifier, for receiving and amplify the first analogue signal from industry spot, and exports and described first simulation
The second analogue signal that signal is corresponding；
Analog-to-digital conversion module, couples mutually with the outfan of described programmable amplifier, for described second analogue signal being converted to
Digital signal；
Control module, couples mutually with described analog-to-digital conversion module, for entering the digital signal from described analog-to-digital conversion module
Row processes, and exports treated digital signal；And
Display module, is connected with described control module, for showing the described digital signal from described control module,
Wherein, described programmable amplifier also includes a channel selection unit, and described control module is according to described digital signal and right
Comparison result between the amplitude range answered is confirmed whether to export a range switching signal, and described channel selection unit is according to described
Range switching signal selects corresponding range gear so that described programmable amplifier according to selected range gear to described the
One analogue signal is amplified.
Voltage measuring apparatus the most according to claim 1, it is characterised in that during described voltage measuring apparatus electrification reset,
The range gear that described channel selection unit selects is the most high-grade.
Voltage measuring apparatus the most according to claim 2, when amplitude range corresponding to described digital signal and current amount
During journey gear coupling, described digital signal is shown and stores by described display module；When the width that described digital signal is corresponding
When value scope is not mated with current range gear, described control module exports described range switching signal so that described passage selects
Select unit and switch to new range gear.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described control module is ARM chip, described
ARM chip has SPI interface, reads the described digital signal from described analog-to-digital conversion module by described SPI interface.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described voltage measuring apparatus also includes power supply mould
Block, it has the power supply chip of two TPS73XX series, for the supply voltage of the different numerical value of output respectively.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described voltage measurement module also includes that outside is deposited
Reservoir, is connected with described control module, for storing the various operations of described digital signal and described voltage measuring apparatus
Parameter.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described channel selection unit is four moulds selecting
Intend switch multiplexer.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described voltage measuring apparatus also includes at signal
Reason module, is arranged between described analog-to-digital conversion module and described control module, for described digital signal is filtered, and
Filtered digital signal is sent into described control module.
Voltage measuring apparatus the most according to claim 8, it is characterised in that described signal processing module uses bubble sort
And described digital signal is averagely filtered by median.
Voltage measuring apparatus the most according to claim 1, it is characterised in that described voltage measuring apparatus also includes input
Keyboard, couples mutually with described control module, is used for manually selecting desired range gear or carrying out parameter setting operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610757045.2A CN106324333A (en) | 2016-08-29 | 2016-08-29 | High-precision voltage measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610757045.2A CN106324333A (en) | 2016-08-29 | 2016-08-29 | High-precision voltage measuring device |
Publications (1)
| Publication Number | Publication Date |
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| CN106324333A true CN106324333A (en) | 2017-01-11 |
Family
ID=57788942
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| CN201610757045.2A Pending CN106324333A (en) | 2016-08-29 | 2016-08-29 | High-precision voltage measuring device |
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Cited By (9)
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| CN108508262A (en) * | 2018-06-26 | 2018-09-07 | 中国工程物理研究院化工材料研究所 | A kind of high-precision small signal measurement system of adaptively selected amplification factor |
| CN109444530A (en) * | 2018-12-13 | 2019-03-08 | 浙江阿海珐配电自动化有限公司 | The method of sampling and device of AC signal |
| CN110988448A (en) * | 2019-12-12 | 2020-04-10 | 厦门市爱维达电子有限公司 | Filtering method applied to UPS bus voltage sampling |
| CN110989463A (en) * | 2019-12-24 | 2020-04-10 | 北京金迈捷科技有限公司 | Online measurement range switching system and method |
| CN112444655A (en) * | 2019-08-27 | 2021-03-05 | 漳州立达信光电子科技有限公司 | Current detection circuit and current detection method |
| CN112462126A (en) * | 2020-10-23 | 2021-03-09 | 北京全路通信信号研究设计院集团有限公司 | Track circuit outdoor equipment with non-contact voltage acquisition function |
| CN114582109A (en) * | 2020-11-30 | 2022-06-03 | 深圳富桂精密工业有限公司 | Terminal device |
| CN114740250A (en) * | 2022-04-15 | 2022-07-12 | 广东舜势测控设备有限公司 | Analog signal detection device and method |
| CN115575688A (en) * | 2022-09-29 | 2023-01-06 | 北京航天计量测试技术研究所 | Weak current detection circuit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508262A (en) * | 2018-06-26 | 2018-09-07 | 中国工程物理研究院化工材料研究所 | A kind of high-precision small signal measurement system of adaptively selected amplification factor |
| CN109444530A (en) * | 2018-12-13 | 2019-03-08 | 浙江阿海珐配电自动化有限公司 | The method of sampling and device of AC signal |
| CN112444655A (en) * | 2019-08-27 | 2021-03-05 | 漳州立达信光电子科技有限公司 | Current detection circuit and current detection method |
| CN110988448A (en) * | 2019-12-12 | 2020-04-10 | 厦门市爱维达电子有限公司 | Filtering method applied to UPS bus voltage sampling |
| CN110989463A (en) * | 2019-12-24 | 2020-04-10 | 北京金迈捷科技有限公司 | Online measurement range switching system and method |
| CN112462126A (en) * | 2020-10-23 | 2021-03-09 | 北京全路通信信号研究设计院集团有限公司 | Track circuit outdoor equipment with non-contact voltage acquisition function |
| CN112462126B (en) * | 2020-10-23 | 2023-04-28 | 北京全路通信信号研究设计院集团有限公司 | Track circuit outdoor equipment with non-contact voltage acquisition function |
| CN114582109A (en) * | 2020-11-30 | 2022-06-03 | 深圳富桂精密工业有限公司 | Terminal device |
| CN114582109B (en) * | 2020-11-30 | 2023-06-06 | 深圳富联富桂精密工业有限公司 | Terminal equipment |
| CN114740250A (en) * | 2022-04-15 | 2022-07-12 | 广东舜势测控设备有限公司 | Analog signal detection device and method |
| CN115575688A (en) * | 2022-09-29 | 2023-01-06 | 北京航天计量测试技术研究所 | Weak current detection circuit |
| CN115575688B (en) * | 2022-09-29 | 2023-11-07 | 北京航天计量测试技术研究所 | Weak current detection circuit |
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Application publication date: 20170111 |