CN203053529U - Weighting device - Google Patents
Weighting device Download PDFInfo
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- CN203053529U CN203053529U CN 201320022023 CN201320022023U CN203053529U CN 203053529 U CN203053529 U CN 203053529U CN 201320022023 CN201320022023 CN 201320022023 CN 201320022023 U CN201320022023 U CN 201320022023U CN 203053529 U CN203053529 U CN 203053529U
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Abstract
The utility model discloses a weighing device. The weighting device comprises a processing module, a power module, an AD sampling module and at least one pressure sensor, wherein the pressure sensor is connected with the power module, the pressure sensor and the power module are connected with a signal conditioning module, the signal conditioning module is connected with the AD sampling module, and the AD sampling module is connected with the processing module. The processing module is used for receiving an AD converted weight signal and an operating voltage signal, the difference between the operating voltage signal with the rated voltage of the pressure sensor is used as the voltage error, and the weight error is calculated according to the voltage error, and furthermore the weight signal is compensated by the weight error and then the weight of a weighting subject is output. The voltage signal output from the pressure sensor and the voltage signal of an additional power supply are sampled, and analyzed and calculated by the processing module, so as to effectively correct the weighting error due to voltage instability, and the high accuracy weighting is realized.
Description
Technical field
The utility model relates to electronic weighing system, relates in particular to a kind of weighing device.
Background technology
Nowadays polytype weight sensor is arranged on the market, wherein based on the power sensor.Although the power sensor is more and more accurate, yet exist many bottlenecks with not enough, wherein topmost problem is exactly that existing weighing device is to microsignal processing power deficiency.Simultaneously, along with the raising to the weighing device accuracy requirement of the development of Power Electronic Technique and market, the measuring accuracy that improves sensor in the weighing device just seems particularly important.
As shown in Figure 1, in the shear beam type sensor based on Wheatstone bridge, if adopt equal arm bridge, and its original state is balance, by calculating the output voltage increment that can draw electric bridge is:
When adopting identical foil gauge, sensitivity coefficient is K (Δ R/R=K ε), and then following formula can be write as:
Its sensitivity is determined, but the signal △ U of electric bridge output is directly proportional with the additional power source voltage U.Therefore improve the sensitivity that the precision of additional power source can improve sensor, but because the existence of arrangement of conductors electric capacity and external interference improves difficulty of supply voltage ratio of precision.
Summary of the invention
The utility model provides a kind of weighing device, and this device adopts the method that its value of weighing is revised to improve the accuracy of its measurement.
A kind of weighing device, comprise a processing module, a power module, an AD sampling module and at least one pressure transducer, described pressure transducer links to each other with power module, pressure transducer and power module all are connected with the signal condition module, described signal condition module links to each other with the AD sampling module, and described AD sampling module links to each other with processing module.
Described pressure transducer is used for the weight of induction carrier, and generates corresponding weight signal;
Described power module is used for providing the operating voltage signal to described pressure transducer;
The signal condition module that is connected with pressure transducer is used for described weight signal is nursed one's health amplification;
The signal condition module that is connected with power module is used for described operating voltage signal is nursed one's health amplification;
Described AD sampling module is used for the weight signal after the conditioning amplification and operating voltage signal are carried out the AD conversion;
Described processing module is used for receiving weight signal and the operating voltage signal after AD changes, make the rated voltage of operating voltage signal and pressure transducer do to obtain voltage error after the difference, calculate weight error according to described voltage error, and then utilize described weight error weight signal to be compensated the weight of back output carrier.
The utility model is by sampling to the output voltage signal of pressure transducer and the voltage signal of additional power source simultaneously, and the analytical calculation by processing module, and effectively the weighting error that causes of revisal supply voltage shakiness has been realized high-precision weighing.
In order effectively to revise temperature to the influence of the foil gauge resistance value in the sensor, suppress temperature simultaneously and float, described pressure transducer comprises four resistance strain gage S1～S4 and nine resistance R 1～R9; Wherein, one end of resistance R 1 is the positive output end of pressure transducer, one end of the other end of resistance R 1 and resistance R 2, one end of resistance R 3, the end of resistance strain gage S1 links to each other with the end of resistance strain gage S4, one end of the other end of resistance strain gage S1 and resistance R 4, one end of resistance R 5, the end of resistance strain gage S2 links to each other with an end of resistance R 6, the other end of resistance R 4 links to each other with the other end of resistance R 5 and is the positive power terminal of pressure transducer, the other end of the other end of resistance strain gage S2 and resistance R 6, the other end of resistance R 2, the other end of resistance R 3, the end of resistance strain gage S3 links to each other with an end of resistance R 7 and is the negative output terminal of pressure transducer, the other end of the other end of resistance strain gage S3 and resistance R 7, one end of resistance R 8, one end of resistance R 9 links to each other with the other end of resistance strain gage S4, and the other end of resistance R 8 links to each other with the other end of resistance R 9 and is the negative power source terminal of pressure transducer.
Described pressure transducer is one or more, and a plurality of pressure transducers can carry out multimetering to object to be weighed, increases the accuracy of weighing.
Described signal condition module adopts the AD620 chip, between two gain-adjusted end and be connected to resistance.
Described processing module is connected with load module, and load module is used for processing module input dependent instruction, and load module can adopt keyboard to instruct input.
Described processing module is connected with display module, and display module can show that display module can be selected liquid crystal display with the gravimetric value of output.
Preferably, described processing module adopts DSP.
The principle of work of weighing device described in the utility model is as follows:
Power module is required 5V or the 3.3V voltage signal of each module in the device with external 5V voltage transitions, for it provides stable operating voltage; Can produce corresponding pressure signal according to different supporting powers after pressure transducer obtains powering, pressure signal is converted to voltage signal export to the signal condition module; The signal condition module also receives the voltage signal of additional power source when receiving the pressure transducer voltage signal, realize the amplification to voltage signal, and the voltage signal after will amplifying is exported to the AD sampling module; The voltage signal of AD sampling module receiving signal reason module output to its sampling, is digital signal with analog signal conversion, and exports to processing module; Behind the processing module receiving digital signals, obtain corresponding gravimetric value by processing.
Through the processing of foregoing circuit, can effectively reduce because the weighting error that spread of voltage brings is realized high-precision weighing measurement.
Compared with prior art, the utlity model has following beneficial effect:
Signal condition module of the present utility model receives the voltage signal of pressure transducer voltage signal and additional power source simultaneously, it is effectively amplified, and the subsequent analysis of passing through processing module is calculated, the effective weighting error that causes of revisal supply voltage shakiness, can effectively reduce the requirement to the precision of additional power source, realize the high-precision weighing of tiny signal is measured.
Description of drawings
Fig. 1 is the shear beam type sensor circuit diagram based on Wheatstone bridge.
Fig. 2 is the structural representation of the utility model weighing device.
Fig. 3 is the circuit diagram of the utility model pressure transducer.
Embodiment
As shown in Figure 2, a kind of weighing device comprises: a power module, a pressure transducer, a signal condition module, an AD sampling module, a DSP processing module, a load module and a display module.
Power module links to each other with each module, converts external 5V voltage signal to the required 5V of each module or 3.3V voltage signal.
Pressure transducer links to each other with power module, pressure transducer adopts shear beam type sensor 0745A in the present embodiment, its sensitivity of determining is 1.9409mV/V @1100kg, external working voltage is 5V, the differential voltage of output is relevant with the voltage that sensor adds, therefore to stablize accurate differential voltage in order exporting, must to stablize impressed voltage.
As shown in Figure 3, pressure transducer comprises four resistance strain gage S1～S4 and nine resistance R 1～R9; Wherein, one end of resistance R 1 is the positive output end of pressure transducer, one end of the other end of resistance R 1 and resistance R 2, one end of resistance R 3, the end of resistance strain gage S1 links to each other with the end of resistance strain gage S4, one end of the other end of resistance strain gage S1 and resistance R 4, one end of resistance R 5, the end of resistance strain gage S2 links to each other with an end of resistance R 6, the other end of resistance R 4 links to each other with the other end of resistance R 5 and is the positive power terminal of pressure transducer, the other end of the other end of resistance strain gage S2 and resistance R 6, the other end of resistance R 2, the other end of resistance R 3, the end of resistance strain gage S3 links to each other with an end of resistance R 7 and is the negative output terminal of pressure transducer, the other end of the other end of resistance strain gage S3 and resistance R 7, one end of resistance R 8, one end of resistance R 9 links to each other with the other end of resistance strain gage S4, and the other end of resistance R 8 links to each other with the other end of resistance R 9 and is the negative power source terminal of pressure transducer.Each is revised resistance and adopts the conjugation mode to connect, and performance complement can effectively be revised temperature to the influence of strain sheet resistance value, suppresses temperature simultaneously and floats.
The signal condition module links to each other with pressure transducer with power module, and the output voltage to power source voltage and sensor amplifies processing simultaneously.The realization of modulate circuit comprises the design of one-level circuit, secondary circuit, the single product connecting resistance design of A/D conversion designs and employing AD620.Wherein the one-level circuit selects to have the amplifier from steady zero (Auto-zero) characteristics, as: the AD8628 of AD company, the Max4239 of Maxim company, the opa735 of TI company, the LTC2050 of Linear company, the ICL7650 of Intersil etc.; Secondary circuit is selected the amplifier of low noise, high bandwidth, uses Rc active analog wave filter.
When real work, the enlargement factor of pressure transducer output signal is regulated resistance and is adopted precision resistance 01A in the signal condition module, and resistance is 100 Ω, and then enlargement factor is G=(49.4k/100)+1=495.
The AD sampling module links to each other with the signal condition module, and the voltage signal of acquisition and conditioning circuit output is digital signal with analog signal conversion, and exports to the DSP processing module, and AD sampling module employing precision is 24 AD conversion chip ADS1234.
Load module links to each other with the DSP processing module, is its input dependent instruction.
Display module links to each other with the DSP processing module, and the value of weighing that the DSP processing module will record by the RS232 mouth is transferred to display module and shows.
The principle that the present embodiment weighing device can carry out the high-precision weighing measurement is as follows:
Suppose to add the actual 4.95V of being of voltage of 5V, object actual weight to be measured is 110Kg.In the course of the work, by signal condition module and AD sampling module, the value that the digital signal that the DSP processing module receives represents respectively is for (numeral is not easy to understand under the sexadecimal, so locate to be converted into the decimal system commonly used) the pressure transducer output voltage signal of 0.9607455mV and typical value be 4.95V add the working power voltage signal, sensitivity 1.9409mV/V@1100kg according to shear beam type sensor 0745A, can converse, the weight that record object to be measured this moment is:
M=0.9607455/4.95/1.9409=110Kg, consistent with actual value.
And in the weighing device that does not adopt the present embodiment device, when the DSP processing module received identical pressure transducer output voltage signal value 0.9607455mV, the weight of heavy value to be measured that converses was:
M＝0.9697455/5/1.9409＝108.9Kg
Can see intuitively, relative error is Δ M=(110-108.9)/110 * 100%=1%, is very large in the accurate such error of fields of measurement, when inexact measurement, if weight of heavy to be measured is very big, the value of absolute error also is very large so.
As seen, adopt the weighing device in the present embodiment can realize high-precision weighing measurement.
Claims (6)
1. weighing device, comprise a processing module, a power module, an AD sampling module and at least one pressure transducer, it is characterized in that: described pressure transducer links to each other with power module, pressure transducer and power module all are connected with the signal condition module, described signal condition module links to each other with the AD sampling module, and described AD sampling module links to each other with processing module.
2. weighing device according to claim 1, it is characterized in that: described pressure transducer comprises four resistance strain gage S1～S4 and nine resistance R 1～R9; Wherein, one end of resistance R 1 is the positive output end of pressure transducer, one end of the other end of resistance R 1 and resistance R 2, one end of resistance R 3, the end of resistance strain gage S1 links to each other with the end of resistance strain gage S4, one end of the other end of resistance strain gage S1 and resistance R 4, one end of resistance R 5, the end of resistance strain gage S2 links to each other with an end of resistance R 6, the other end of resistance R 4 links to each other with the other end of resistance R 5 and is the positive power terminal of pressure transducer, the other end of the other end of resistance strain gage S2 and resistance R 6, the other end of resistance R 2, the other end of resistance R 3, the end of resistance strain gage S3 links to each other with an end of resistance R 7 and is the negative output terminal of pressure transducer, the other end of the other end of resistance strain gage S3 and resistance R 7, one end of resistance R 8, one end of resistance R 9 links to each other with the other end of resistance strain gage S4, and the other end of resistance R 8 links to each other with the other end of resistance R 9 and is the negative power source terminal of pressure transducer.
3. weighing device according to claim 1 is characterized in that: described signal condition module adopts the AD620 chip, between two gain-adjusted end and be connected to resistance.
4. weighing device according to claim 1, it is characterized in that: described processing module is connected with load module.
5. weighing device according to claim 1, it is characterized in that: described processing module is connected with display module.
6. according to the described weighing device of the arbitrary claim of claim 1～5, it is characterized in that: described processing module adopts DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320022023 CN203053529U (en) | 2013-01-16 | 2013-01-16 | Weighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320022023 CN203053529U (en) | 2013-01-16 | 2013-01-16 | Weighting device |
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| CN203053529U true CN203053529U (en) | 2013-07-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218988A (en) * | 2017-06-22 | 2017-09-29 | 中山天业智能装备科技有限公司 | The weighing instrument and its detection method of a kind of quick high accuracy |
| CN111789602A (en) * | 2020-07-16 | 2020-10-20 | 德阳市人民医院 | Medical waste liquid collecting and metering device |
| CN113739881A (en) * | 2021-11-08 | 2021-12-03 | 深圳市杰曼科技股份有限公司 | Temperature drift resistant weighing sensor signal measuring circuit |
-
2013
- 2013-01-16 CN CN 201320022023 patent/CN203053529U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218988A (en) * | 2017-06-22 | 2017-09-29 | 中山天业智能装备科技有限公司 | The weighing instrument and its detection method of a kind of quick high accuracy |
| CN111789602A (en) * | 2020-07-16 | 2020-10-20 | 德阳市人民医院 | Medical waste liquid collecting and metering device |
| CN113739881A (en) * | 2021-11-08 | 2021-12-03 | 深圳市杰曼科技股份有限公司 | Temperature drift resistant weighing sensor signal measuring circuit |
| CN113739881B (en) * | 2021-11-08 | 2022-01-25 | 深圳市杰曼科技股份有限公司 | Temperature drift resistant weighing sensor signal measuring circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20160116 |
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| EXPY | Termination of patent right or utility model |