CN206208355U - A kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor - Google Patents
A kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor Download PDFInfo
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- CN206208355U CN206208355U CN201621316005.6U CN201621316005U CN206208355U CN 206208355 U CN206208355 U CN 206208355U CN 201621316005 U CN201621316005 U CN 201621316005U CN 206208355 U CN206208355 U CN 206208355U
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- fpga
- resistance strain
- resistance
- cantilever beam
- weighing sensor
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Abstract
The utility model is related to electronic technology, and in particular to a kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, including mechanical structure and circuit part；Circuit part includes linear power supply and reference voltage module；Mechanical structure includes support, cantilever beam and the scale pan, and cantilever beam one end is fixed on support, and the scale pan hangs on the cantilever beam other end；Circuit part also includes resistance strain sensor, signal amplification module, low pass filter, A/D converter, FPGA and keyboard control module and LCD display module；Resistance strain sensor is sequentially connected with signal amplification module, low pass filter, A/D converter, FPGA, and keyboard control module, LCD display module are connected with FPGA；Reference voltage module is powered for resistance strain sensor, and linear power supply is powered for electronic scale system；Resistance strain sensor is affixed on cantilever beam near one end of support, and remaining circuit part may be contained within support.The electronic scale fast response time, man-machine interaction is good, and certainty of measurement is high, multiple functional.
Description
Technical field
The utility model belongs to electronic technology field, more particularly to a kind of FPGA that is based on is with resistance strain gage as weighing and sensing
The Simple electronic scale of device.
Background technology
Scale is a kind of measuring appliance used extensively in real work and life.With measurement technology and electronic technology
The meausring apparatuses such as development, steelyard, platform balance, the platform scale of traditional pure mechanic structure have been difficult to full at aspects such as function, precision, cost performances
The need for sufficient people, especially in intellectuality, portable, to the measurement of Tiny Mass in terms of more seem unable to do what one wishes.
Electronic weighting equipment such as electronic balance, electronic scale etc. are so that it is accurate, weigh quick, convenient reading, intuitive display, energy
Work under severe conditions, be easy to be favored by people many advantages, such as computer technology is combined, extensively should
For each departments such as industrial and mining enterprises, energy traffic, commerce and trade and science and technology.
But, conditional electronic scale has that response speed is slow, operability is poor,.
Utility model content
The purpose of this utility model is to provide a kind of certainty of measurement high, fast response time, multiple functional, working stability operation
Simple Simple electronic scale.
To achieve the above object, the technical solution adopted in the utility model is：One kind is with resistance strain gage based on FPGA
The Simple electronic scale of weighing sensor, including mechanical structure and circuit part；Circuit part includes linear power supply and reference voltage
Module；Mechanical structure includes support, cantilever beam and the scale pan, and cantilever beam one end is fixed on support, and it is another that the scale pan hangs on cantilever beam
One end；Circuit part also includes resistance strain sensor, signal amplification module, low pass filter, A/D converter, FPGA and key
Disk control module and LCD display module；Resistance strain sensor and signal amplification module, low pass filter, A/D converter,
FPGA is sequentially connected, and keyboard control module, LCD display module are connected with FPGA；Reference voltage module is resistance strain sensor
Power supply, linear power supply is powered for electronic scale system；Resistance strain sensor is affixed on cantilever beam near one end of support, remaining circuit
Part may be contained within support.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, resistance strain sensor
From four metal strain plates, it is connected into full bridge formation and is affixed on cantilever beam near one end of support.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, signal amplification module bag
Include first order precision instrument amplifier, second level precision operational-amplifier；First order precision instrument amplifier selects INA128, the
Two grades of precision operational-amplifiers select OPA277；The output of resistance strain sensor connects the positive and negative input of INA128 respectively,
R is connected between 1, No. 8 pins of INA128 control gainsGThe resistance of=120 Ω；The output of INA128 passes through a R1=100 Ω's
Resistance connects the negative input end of OPA277, and OPA277 is used and one is connected between the connection of anti-phase amplification, 2, No. 6 pins of OPA277
R2The resistance of=1.5K.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, low pass filter is used
Second order active low pass filter of the 3dB points in 10Hz.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, A/D converter is selected
ADS1118, adds one-level light-coupled isolation chip ISO7241, ISO7241 to be connected to ADS1118's between ADS1118 and FPGA
Simulation input mouthful AIN1.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, the choosing of reference voltage module
With REF5025, one-level precision amplifier OPA277 is added to do voltage follow between REF5025 and resistance strain sensor.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, linear power supply is selected
UA7805 or UA7905.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, support uses T fonts
Quality carbon steel, height is not more than 40cm.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, cantilever beam uses No. 45
Steel, and take annealing.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, pallet is using square
Use for laboratory universal plate, four angles of square pallet are fixed on cantilever beam by four iron wires.
Above-mentioned Simple electronic scale operation principle is as follows：The weight of different quality causes resistance-strain on cantilever beam on the scale pan
The change of piece resistance, sensor exports different magnitudes of voltage；Small voltage signal input first order precision instrument amplifier is put
Greatly；Signal input second level precision operational-amplifier after amplification amplifies again；Signal input LPF after two grades of amplifications
Device filters the high-frequency noise of front stage circuits generation；Filtered direct current signal is sampled by A/D converter, conversion；Letter after conversion
Number again by FPGA treatment；Keyboard control module selects the difference in functionality of electronic scale system；LCD display module shows weight in real time
Relevant information；The supply voltage of resistance strain gage resistance is provided by reference voltage module.
The beneficial effects of the utility model are：Simple electronic scale system realizes survey of the weight quality from 1.00g to 300g
Amount and display, error is within 0.1g.Its is stable and reliable in work, and man-machine interaction is good, and certainty of measurement increases；With going
Skin, setting unit price, the display amount of money, small change, the function of Conversion of measurement unit, have expanded the function of electronic scale；And fast response time, operation
Simply, with actually used value higher.
Brief description of the drawings
Fig. 1 is the utility model one embodiment circuit part block diagram；
Fig. 2 is the utility model one embodiment amplification module circuit diagram；
Fig. 3 is the utility model one embodiment low-pass filter circuit figure；
Fig. 4 is the utility model one embodiment A/D converter circuit diagram；
Fig. 5 is the utility model one embodiment reference voltage module circuit diagram；
Fig. 6 is the utility model one embodiment mechanical structure structure chart.
Specific embodiment
Implementation method of the present utility model is described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein same or similar label represents identical or class from start to finish
As element or the element with same or like function.Below with reference to Description of Drawings embodiment be it is exemplary, only
For explaining the utility model, and can not be construed to limitation of the present utility model.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model.For
Simplification disclosure of the present utility model, hereinafter part and setting to specific examples be described.They are only merely illustrative, and
And purpose does not lie in limitation the utility model.Additionally, the utility model can in different examples repeat reference numerals and/or word
It is female.This repetition is for purposes of simplicity and clarity, between discussed various embodiments itself not being indicated and/or being set
Relation.Additionally, the utility model provides the example of various specific techniques and material, but those of ordinary skill in the art can
To recognize the use of the applicability and/or other materials of other techniques.In addition, fisrt feature described below is special second
Levy it " on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other spy
The embodiment being formed between the first and second features is levied, such first and second feature may not be directly contact.
In description of the present utility model, it is necessary to explanation, unless otherwise prescribed and limit, term " connected " " connection " answer
It is interpreted broadly, can is direct for example, it may be mechanically connecting or electrical connection, or two connections of element internal
It is connected, it is also possible to be indirectly connected to by intermediary, for those of ordinary skill in the related art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term.
The present embodiment is adopted the following technical scheme that：A kind of simple electricity based on FPGA with resistance strain gage as weighing sensor
Sub- scale, including mechanical structure and circuit part；Circuit part includes linear power supply and reference voltage module；Mechanical structure includes branch
Frame, cantilever beam and the scale pan, cantilever beam one end are fixed on support, and the scale pan hangs on the cantilever beam other end；Circuit part also includes
Resistance strain sensor, signal amplification module, low pass filter, A/D converter, FPGA and keyboard control module and LCD show
Module；Resistance strain sensor is sequentially connected with signal amplification module, low pass filter, A/D converter, FPGA, Keyboard Control
Module, LCD display module are connected with FPGA；Reference voltage module is powered for resistance strain sensor, and linear power supply is electronic scale
System power supply；Resistance strain sensor is affixed on cantilever beam near one end of support, and remaining circuit part may be contained within support.
Further, resistance strain sensor selects four metal strain plates, is connected into full bridge formation and is affixed on cantilever beam near branch
One end of frame.
Further, signal amplification module includes first order precision instrument amplifier, second level precision operational-amplifier；First
Level precision instrument amplifier selects INA128, second level precision operational-amplifier to select OPA277；Resistance strain sensor it is defeated
Go out to connect respectively and connect R between the positive and negative input of INA128,1, No. 8 pins of INA128 control gainsGThe resistance of=120 Ω；
The output of INA128 passes through a R1The resistance of=100 Ω connects the negative input end of OPA277, and OPA277 is using anti-phase amplification
A R is connected between connection, 2, No. 6 pins of OPA2772The resistance of=1.5K.
Further, low pass filter uses 3dB points in the second order active low pass filter of 10Hz.
Further, A/D converter selects ADS1118, and one-level light-coupled isolation chip is added between ADS1118 and FPGA
ISO7241, ISO7241 are connected to the simulation input mouthful AIN1 of ADS1118.
Further, reference voltage module selects REF5025, and one-level is added between REF5025 and resistance strain sensor
Precision amplifier OPA277 does voltage follow.
In the above-mentioned Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, linear power supply is selected
UA7805 or UA7905.
Further, support uses T font quality carbon steels, height to be not more than 40cm.
Further, cantilever beam uses No. 45 steels, and takes annealing.
Further, pallet uses four angles of foursquare use for laboratory universal plate, square pallet to pass through four iron
Silk is fixed on cantilever beam.
When the present embodiment is embodied, as shown in figure 1, a kind of letter based on FPGA with resistance strain gage as weighing sensor
Easy electronic scale includes circuit part：Resistance strain sensor, signal amplification module, low pass filter, A/D converter, FPGA and
Keyboard control module and LCD display module.
Resistance strain sensor and first order precision instrument amplifier, second level precision operational-amplifier, low pass filter,
A/D converter, FPGA are sequentially connected；Keyboard control module, LCD display module are connected with FPGA.
And, it is system power supply to use linear power supply UA7805, UA7905, and electromagnetic interference is small, and ripple factor is very low, can be neglected
Slightly disregard, and voltage stabilizing rate is high.Resistance strain sensor selects four metal strain plates, is connected into full bridge formation and is affixed on cantilever beam and leans on
One end of nearly support, to improve the sensitivity of sensor.First precision instrument amplifier selects INA128, is suitable to amplify small letter
Number；Second precision operational-amplifier selects OPA277, introduces minimum system noise；Influence of noise is negligible after two-stage is amplified,
So that the certainty of measurement of Simple electronic scale is high.Low pass filter selects second order active low pass filter, filters front stage circuits generation
High-frequency noise, improve certainty of measurement.That A/D converter is selected is small-sized, low-power consumption the ADS1118 of 16.Fiducial chip
That module is selected is REF5025, makes the voltage of supply circuit more stable.One-level light-coupled isolation is added between ADS1118 and FPGA
That chip is selected is ISO7241, reduces the influence between simulation system and digital display circuit.Sensed in REF5025 and resistance-strain
Add one-level precision amplifier OPA277 to do voltage follow between device, reduce voltage pulsation, improve the driving force of a reference source.
And, using FPGA software control realizations peeling, the functions such as unit price, the display amount of money and small change, and energy are set
Enough calibrate weighing system, carry out Conversion of measurement unit, storage weight quality and total amount etc. so that Simple electronic scale is multiple functional.
As shown in Fig. 2 the output of resistance strain sensor respectively connection first order precision instrument amplifier INA128 just,
R is connected between negative input end, 1, No. 8 pins of INA128 control gainsGThe resistance of=120 Ω, then first order precision instrument amplification
The multiplication factor of device isTimes；The output of INA128 passes through a R1The resistance connection the of=100 Ω
Two grades of negative input ends of precision operational-amplifier OPA277, i.e. OPA277 uses the connection of metastable anti-phase amplification,
A R is connected between 2, No. 6 pins of OPA2772The resistance of=1.5K, the multiplication factor of second level precision operational-amplifier isTimes.
As shown in figure 3, second order active low pass filter of the signal after amplifying by 3dB points in 10Hz filters front stage circuits
The high-frequency noise of generation, improves certainty of measurement.
As shown in figure 4, to reduce the influence between simulation system and digital display circuit, Jia one between ADS1118 and FPGA
Level light-coupled isolation chip ISO7241.It is direct current signal due to what is obtained after LPF, need to be only connected to one of ADS1118
Simulation input mouthful AIN1.
As shown in figure 5, in order that the voltage of supply circuit more stablize, reduce measurement error, resistance strain sensor electricity
The supply voltage of bridge is provided by reference voltage module REF5025.In order to reduce voltage pulsation, the driving force of a reference source is improved,
One-level precision amplifier OPA277 is added to do voltage follow with slow between reference voltage module REF5025 and resistance strain sensor
Punching.
As shown in fig. 6, the mechanical structure of Simple electronic scale includes support, cantilever beam, the scale pan, irony cantilever beam is fixed on branch
On frame, resistance strain sensor is affixed on cantilever beam near one end of support with full bridge formation, and the scale pan hangs on the cantilever beam other end；
Support uses the quality carbon steel of T fonts, and height is not more than 40cm.Cantilever beam uses No. 45 steels, and takes annealing
Treatment, eliminates the residual stress inside beam, improves certainty of measurement.Pallet uses the use for laboratory universal plate of square shape,
Pallet corner is connected to using four iron wires, cantilever beam is then fixed on, the stability of a system can be improved.
The circuit part of the present embodiment Simple electronic scale, except resistance strain sensor is affixed on cantilever beam near the one of support
End, remaining circuit part is arranged in support.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
Although specific embodiment of the present utility model, those of ordinary skill in the art above in association with Description of Drawings
It should be appreciated that these are merely illustrative of, various deformation or modification can be made to these implementation methods, without departing from this practicality
New principle and essence.Scope of the present utility model is only limited by the claims that follow.
Claims (10)
1. a kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor, including mechanical structure and circuit portion
Point；Circuit part includes linear power supply and reference voltage module；Mechanical structure includes support, cantilever beam and the scale pan, cantilever beam one
End is fixed on support, and the scale pan hangs on the cantilever beam other end；Characterized in that, circuit part is also sensed including resistance-strain
Device, signal amplification module, low pass filter, A/D converter, FPGA and keyboard control module and LCD display module；Resistance-strain
Sensor is sequentially connected with signal amplification module, low pass filter, A/D converter, FPGA, keyboard control module, LCD display moulds
Block is connected with FPGA；Reference voltage module is powered for resistance strain sensor, and linear power supply is powered for electronic scale system；Resistance should
Become sensor and be affixed on cantilever beam near one end of support, remaining circuit part may be contained within support.
2. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In resistance strain sensor selects four metal strain plates, is connected into full bridge formation and is affixed on cantilever beam near one end of support.
3. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In signal amplification module includes first order precision instrument amplifier, second level precision operational-amplifier；First order precision instrument is put
Big device selects INA128, second level precision operational-amplifier to select OPA277；The output of resistance strain sensor is connected respectively
R is connected between the positive and negative input of INA128,1, No. 8 pins of INA128 control gainsGThe resistance of=120 Ω；INA128's is defeated
Go out by a R1The resistance of=100 Ω connects the negative input end of OPA277, and OPA277 uses the connection of anti-phase amplification, OPA277
2, No. 6 pins between connect a R2The resistance of=1.5K.
4. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In low pass filter uses 3dB points in the second order active low pass filter of 10Hz.
5. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In, A/D converter selects ADS1118, and one-level light-coupled isolation chip ISO7241 is added between ADS1118 and FPGA,
ISO7241 is connected to the simulation input mouthful AIN1 of ADS1118.
6. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In reference voltage module selects REF5025, and one-level precision amplifier is added between REF5025 and resistance strain sensor
OPA277 does voltage follow.
7. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In linear power supply selects UA7805 or UA7905.
8. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In support uses T font quality carbon steels, height to be not more than 40cm.
9. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In cantilever beam uses No. 45 steels, and takes annealing.
10. Simple electronic scales of the FPGA with resistance strain gage as weighing sensor is based on as claimed in claim 1, and its feature exists
In pallet uses foursquare use for laboratory universal plate, and cantilever beam is fixed in four angles of square pallet by four iron wires
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621316005.6U CN206208355U (en) | 2016-12-02 | 2016-12-02 | A kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621316005.6U CN206208355U (en) | 2016-12-02 | 2016-12-02 | A kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206208355U true CN206208355U (en) | 2017-05-31 |
Family
ID=58752469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621316005.6U Expired - Fee Related CN206208355U (en) | 2016-12-02 | 2016-12-02 | A kind of Simple electronic scale based on FPGA with resistance strain gage as weighing sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206208355U (en) |
-
2016
- 2016-12-02 CN CN201621316005.6U patent/CN206208355U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170531 Termination date: 20171202 |