CN103575376B - A kind of circuit and method for solving many LOAD CELLS output signal negative sense drifts online - Google Patents
A kind of circuit and method for solving many LOAD CELLS output signal negative sense drifts online Download PDFInfo
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Abstract
The invention provides a kind of simulation LOAD CELLS circuit and method that can solve many LOAD CELLS output signal negative sense drifts online.The circuit is included by first resistor（R1）, second resistance（R2）, the 4th resistance（R4）Three bridge arms respectively constituting and by 3rd resistor（R3）With the first potentiometer（W1）The resistance bridge of another bridge arm composition in series, is in series with the second potentiometer between a pair of nodes of the resistance bridge（W2）With the 6th resistance（R6）, the another of the resistance bridge form excitation anode respectively to node（EXC+）With excitation negative terminal（EXC‑）, the 6th resistance（R6）Two ends form signal output anode respectively（SIG+）With signal output negative terminal（SIG‑）.The present invention can solve the problems, such as that LOAD CELLS negative sense drifts about online, and need not change LOAD CELLS；Processing method quickly effectively, farthest can avoid affecting production.
Description
Technical field
The invention belongs to field of measuring techniques, is related to one kind and solves many LOAD CELLS output signal negative sense drifts online
Simulation LOAD CELLS circuit and the method for solving the drift of many LOAD CELLS output signal negative senses using the circuit.
Background technology
In metallurgy industry, each production link all be unable to do without electronic scale, and electronic scale directly participates in the measure of production with control.One
As in the case of, at least 3 LOAD CELLSs of an electronic scale, at most 8 to 10.When weighing, LOAD CELLS will be claimed thing
The weight of body is converted to electric signal, the input of weighing instrument is then input into after the output signal parallel connection of each LOAD CELLS, is claimed
Weight instrument is by conversion and calibrates, the final weight for showing weighed object.Fig. 1 show existing electronic scale weighing circuit diagram, it
By some LOAD CELLSs（N1、N2、....Nn）Constitute with weighing instrument, each LOAD CELLS can be reduced to a Hui Sidun
Electric bridge, and each LOAD CELLS is equipped with signal output anode（SIG+）, signal output negative terminal（SIG-）, excitation anode（EXC
+）With excitation negative terminal（EXC-）, and be connected with weighing instrument corresponding port respectively.In actual use, during one section of use
Between after based on some external causes as being weighed object LOAD CELLS being impacted when measuring, make LOAD CELLS due to bullet
Gonosome there occurs elastic deformation in itself and can not return to reset condition, and the factor of LOAD CELLS such as weighing and sensing itself
Using after some cycles, offset output signal there occurs drift compared with the output of original zero signal to device, cause electronic scale to exist
After a period of time, the total input signal of its weighing instrument（That is the total output signal of LOAD CELLS）With original total input
Signal is compared, and has different degrees of change.When many LOAD CELLSs occur negative sense drift（I.e. with primary output signal phase
Than LOAD CELLS output signal is exported for negative value）When, reduce can the total output signal of LOAD CELLS, so that weighing
The total output signal of sensor is negative sense output voltage, beyond the input reference signal of weighing instrument（The signal of weighing instrument is defeated
It is a positive range to enter scope, and input reference signal is 0 ~ 30mV）, cause weighing instrument work.
It was all to change these LOAD CELLSs that negative sense drift occurs in the past to solve problems, made the total of LOAD CELLS
Output voltage reaches reset condition scope.But, change LOAD CELLS spare part input very greatly, when spares reserve is not enough,
Plant maintenance personnel cannot solve such failure, after can only waiting spare part in place, can just fix a breakdown, final to affect normal raw
Produce.
The content of the invention
An object of the present invention is the problem existed for prior art, there is provided one kind can solve many titles online
The simulation LOAD CELLS circuit of sensor output signal negative sense drift is retransmitted, weighing and sensing is solved online by the access of the circuit
Device output signal negative sense drift phenomenon, it is to avoid the replacing of LOAD CELLS.
Bear another object of the present invention is to provide one kind and solve many LOAD CELLS output signals using foregoing circuit
To the method for drift.
For this purpose, the present invention is adopted the following technical scheme that：
A kind of simulation LOAD CELLS circuit that can solve many LOAD CELLS output signal negative sense drifts online, which is special
Levy and be, including three bridge arms respectively constituted by first resistor, second resistance, the 4th resistance and electric with first by 3rd resistor
The resistance bridge of position device another bridge arm composition in series, is in series with second between a pair of nodes of the resistance bridge
Potentiometer and the 6th resistance, the another of the resistance bridge form excitation anode and excitation negative terminal respectively to node, and described the
The two ends of six resistance form signal output anode and signal output negative terminal respectively.
Further, second potentiometer and the 6th resistance are also in series with the 5th resistance.
Further, the first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance
Resistance is 300 Ω, and the Standard resistance range of the first potentiometer is 0-250 Ω, and the Standard resistance range of the second potentiometer is 0-20k Ω.
A kind of method that utilization foregoing circuit solves many LOAD CELLS output signal negative sense drifts, including following step
Suddenly：
（1）Under electronic scale immunization with gD DNA vaccine, the signal output anode of simulation LOAD CELLS circuit, signal output are born
End, excitation anode and excitation negative terminal are connected respectively with the corresponding port of weighing instrument；
（2）Coarse adjustment：According to the negative voltage value of LOAD CELLS always output, the first potentiometer resistance is adjusted, claims simulation
One forward voltage values of sensor circuit output are retransmitted, is offseted with the negative voltage value of LOAD CELLS output or is made weighing instrument
Total input voltage value increases as forward voltage values；
（3）Accurate adjustment：The second potentiometer resistance is adjusted, makes the voltage output value of simulation LOAD CELLS circuit make small range change
Change, finally make the voltage input levels of weighing instrument reach normal value.
As the resistance of each bridge arm of electronic scale LOAD CELLS is generally the substitutional resistance of 300 Ω or so, it is and biography of weighing
Sensor matches, and the resistance of the first to the 6th resistance of the invention is set as 300 Ω.Simulation LOAD CELLS circuit is used
Resistance must select the wire-wound resistor or metalfilmresistor that temperature coefficient is little, stability is high, potentiometer select many of high stability
Circle potentiometer.The effect of the 5th resistance be ensure circuit safety, prevent the second potentiometer resistance be 0 when, the 6th resistance two ends
It is excessive that voltage simulates LOAD CELLS circuit output voltage, damages weighing instrument.
The circuit theory of the present invention is as follows：
1st, as shown in Fig. 2 according to the principle of resistance bridge, simulating the output voltage at LOAD CELLS circuit A, B two ends:
Uab=Ui[R2/（R1+R2）- R3/（R3+△W1+R4）] （Formula one）
Simulation LOAD CELLS output voltage simulates load cell signal output end SIG+, SIG- output voltage for the
Six resistance R6 both end voltages UR6, and UR6= USIG+SIG-= Uab-UR5-U△W2 （Formula two）
In above formula：Ui--- the confession bridge voltage of-LOAD CELLS, i.e. weighing instrument encourage anode EXC+ with excitation negative terminal
EXC- puts on the supply voltage on LOAD CELLS；
USIG+SIG-----simulation LOAD CELLS circuit output voltage；
UR5--- the-the five resistance R5 both end voltages；
U△W2--- the-the second potentiometer W2 both end voltages；
△ W1---- the first potentiometer W1 resistances.
2nd, operation principle of the present invention is further illustrated so that 5V is for bridge voltage as an example below.
When to adjust the first potentiometer W1 potentiometer resistances be zero, bridge balance simulates LOAD CELLS circuit A, B two ends
Output voltage UabFor 0mV, LOAD CELLS output voltage U is now simulatedR6Voltage is also 0mV.
Adjust the first potentiometer W1 resistances △ W1 for 250 Ω when, U can be obtained by formula oneabFor 735mV, the second potentiometer is adjusted
W2 resistance △ W2 be adjusted to for 10430 Ω when, simulate LOAD CELLS output voltage UR6For 20mV.Certainly, the first potentiometer W1
When resistance △ W1 is 250 Ω, the second potentiometer W2 resistance △ W2 of adjustment progressively reduce, voltage UR6Can be stepped up, but it is actual
During use, too high output voltage will not be used, is adjusted to during 10430 Ω, be output as 20mV, offset negative sense drift enough.
The first potentiometer W1 resistances are adjusted in 60 Ω, when the second potentiometer W2 resistances of adjustment are 16450 Ω, biography of weighing is simulated
Sensor exports output voltage UR6For 4mV.
Can be seen that from the adjustment of above potentiometer, simulate LOAD CELLS output voltage UR6Can adjust between the mV of 4 mV to 20
Section, this value range be enough to offset the negative sense output valve that the drift of LOAD CELLS negative sense is produced, and can meet general electronic scale
Use.
The beneficial effects of the present invention is：Can solve the problems, such as that LOAD CELLS negative sense drifts about online, and without the need for more antonomasia
Retransmit sensor；Processing method quickly effectively, farthest can avoid affecting production；Method is with low cost, it is easy to implement.
Description of the drawings
Fig. 1 is existing electronic scale weighing circuit theory diagrams；
Fig. 2 is present invention simulation LOAD CELLS circuit theory diagrams；
Fig. 3 accesses schematic diagram for present invention simulation LOAD CELLS and weighing instrument.
In figure, round dot indication circuit tie point.
Specific embodiment
As shown in Fig. 2 a kind of simulation weighing and sensing that can solve many LOAD CELLS output signal negative sense drifts online
Device circuit, including three bridge arms respectively constituted by first resistor R1, second resistance R2, the 4th resistance R4 and by 3rd resistor R3
The resistance bridge of another bridge arm composition in series with the first potentiometer W1, between a pair of nodes of the resistance bridge
The 5th resistance R5, the second potentiometer W2 and the 6th resistance R6 are in series with, the another of the resistance bridge is formed respectively to node
Excitation anode EXC+ and excitation negative terminal EXC-, the two ends of the 6th resistance R6 form signal output anode SIG+ and signal respectively
Output negative terminal SIG-.
And first resistor R1 to the 6th resistance R6 resistances are 300 Ω, the Standard resistance range of the first potentiometer W1 is 0-250
The Standard resistance range of Ω, the second potentiometer W2 is 0-20k Ω.
180t static electronic scales are weighed as with maximum below（Using 8 50t LOAD CELLSs）As a example by, further illustrate profit
The method that many LOAD CELLS output signal negative sense drifts are solved with foregoing circuit.The electronic scale weighing sensor supplies bridge voltage
For 5V, under normal immunization with gD DNA vaccine, the total output voltage values of LOAD CELLS are 3.70mV（Because there is scale pan effect of weight, without the scale pan
When be 0 mV）；Under the influence of multiple factors, LOAD CELLS total output signal occur negative sense drift, total output voltage values be specially-
0.50mV, solves process as follows：
（1）Under electronic scale immunization with gD DNA vaccine, as shown in figure 3, by the signal output anode of simulation LOAD CELLS circuit, believing
Number output negative terminal, excitation anode and excitation negative terminal be connected with the corresponding port of weighing instrument respectively；
（2）Coarse adjustment：According to the negative voltage value of LOAD CELLS always output, the first potentiometer W1 resistances of regulation are 60 Ω,
According to formula one, simulation LOAD CELLS circuit A, B two ends can be made to obtain a forward voltage 227mV, so that simulation weighing and sensing
One forward voltage values of device circuit output, are offseted with the negative voltage value of LOAD CELLS output；
（3）Accurate adjustment：The second potentiometer W2 resistances are adjusted, makes the voltage output value of simulation LOAD CELLS circuit make little amplitude variation
Change, to the second potentiometer W2 resistances be 15630 Ω when, in USIG+SIG-Two ends obtain the voltage of 4.2 mV, the voltage of weighing instrument
Input value reaches normal value 4.2-0.50mV=3.70 mV.
Claims (1)
1. a kind of to solve the method that many LOAD CELLS output signal negative senses drift about using simulation LOAD CELLS circuit, which is special
Levy and be, the simulation LOAD CELLS circuit includes being respectively constituted by first resistor R1, second resistance R2, the 4th resistance R4
Three bridge arms and the resistance bridge being made up of 3rd resistor R3 and the first potentiometer W1 another bridge arm in series, the favour
The second potentiometer W2, the 5th resistance R5 and the 6th resistance R6 are in series between a pair of nodes of this electric bridge, the Hui Sidun is electric
The another of bridge forms excitation anode EXC+ and excitation negative terminal EXC- respectively to node, and the two ends of the 6th resistance R6 are formed respectively
Signal output anode SIG+ and signal output negative terminal SIG-；First resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the resistance of the 5th resistance R5 and the 6th resistance R6 are 300 Ω, and the Standard resistance range of the first potentiometer W1 is 0-250 Ω,
The Standard resistance range of the second potentiometer W2 is 0-20k Ω；
Methods described comprises the steps：
（1）Under electronic scale immunization with gD DNA vaccine, by the signal output anode SIG+ of the simulation LOAD CELLS circuit, signal output
Negative terminal SIG-, excitation anode EXC+ and excitation negative terminal EXC- are connected respectively with the corresponding port of weighing instrument；
（2）Coarse adjustment：According to the negative voltage value of LOAD CELLS always output, the resistance of the first potentiometer W1 is adjusted, claims simulation
One forward voltage values of sensor circuit output are retransmitted, is offseted with the negative voltage value of LOAD CELLS output or is made weighing instrument
Total input voltage value increases as forward voltage values；
（3）Accurate adjustment：The second potentiometer W2 resistances are adjusted, makes the voltage output value of simulation LOAD CELLS circuit make small range change
Change, finally make total input voltage value of weighing instrument reach normal value.
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| CN201310475110.9A CN103575376B (en) | 2013-10-12 | 2013-10-12 | A kind of circuit and method for solving many LOAD CELLS output signal negative sense drifts online |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105157809A (en) * | 2015-05-25 | 2015-12-16 | 平顶山电子衡器制造有限公司 | Universal weighing signal generator |
| CN105067096B (en) * | 2015-07-28 | 2017-05-31 | 本钢板材股份有限公司 | A kind of portable bunker scale exerciser simulated calibration device and scaling method |
| EP3205992B1 (en) * | 2016-02-11 | 2019-06-19 | MOBA - Mobile Automation AG | Electrical circuit, weighing cell, load detection device and vehicle with a load detection device |
| CN106802170B (en) * | 2016-12-30 | 2019-07-19 | 北京七星华创流量计有限公司 | Flow sensor, mass flow conveying measure and control device and its temperature drift suppressing method |
| CN109900348A (en) * | 2017-12-08 | 2019-06-18 | 奥豪斯仪器（常州）有限公司 | A kind of method that instrument and scale body arbitrarily match combination |
| CN109741524A (en) * | 2018-12-29 | 2019-05-10 | 北京沃东天骏信息技术有限公司 | Goods selling equipment, the recognition methods of article, device and computer readable storage medium |
| CN111060237A (en) * | 2019-10-23 | 2020-04-24 | 宁波柯力传感科技股份有限公司 | Bridge circuit of force cell |
| CN114812915B (en) * | 2022-06-24 | 2022-10-18 | 中国空气动力研究与发展中心低速空气动力研究所 | Pressure scanning valve circuit |
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| CN201177531Y (en) * | 2008-04-08 | 2009-01-07 | 上海梅山钢铁股份有限公司 | Electric resistance strain type weighing sensor simulator |
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| GB1093760A (en) * | 1965-11-11 | 1967-12-06 | Siemens Ag | Improvements in or relating to electric measuring devices |
| US3847017A (en) * | 1972-03-20 | 1974-11-12 | Welwyn Electric Ltd | Strain measuring system |
| CN2236649Y (en) * | 1995-04-25 | 1996-10-02 | 平志年 | Temperature and level monitoring alarm of solar water heater |
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