CN202305000U - Automatic compensation signal acquisition system - Google Patents
Automatic compensation signal acquisition system Download PDFInfo
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- CN202305000U CN202305000U CN2011204012387U CN201120401238U CN202305000U CN 202305000 U CN202305000 U CN 202305000U CN 2011204012387 U CN2011204012387 U CN 2011204012387U CN 201120401238 U CN201120401238 U CN 201120401238U CN 202305000 U CN202305000 U CN 202305000U
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Abstract
The utility model discloses an automatic compensation signal acquisition system which comprises a power supply module, a micro controller, a reference circuit, an A/D (analog-to-digital) conversion circuit, a hardware filter circuit, an amplifying circuit, a weighing sensor and a compensation module, wherein the compensation module comprises an analog switching circuit and a voltage division circuit, the weighing sensor outputs a pair of feedback signals to the voltage division circuit and the reference circuit, the reference circuit adjusts input impedance according to the feedback signals and outputs a reference voltage to the A/D conversion circuit, the voltage division circuit performs voltage division on the feedback signals so as to generate a reference signal, and the analog switching circuit alternately acquires an output signal from the weighing sensor and the reference signal from the voltage division circuit so as to determine circuit deviation and further implement the circuit compensation. The automatic compensation signal acquisition system provided by the utility model has the beneficial effects that a pair of feedback signals is added through six-wire system connection and the signals in the system are acquired and processed in cooperation with the voltage division circuit and the analog switching circuit so as to implement he circuit compensation, thus greatly improving the precision and accuracy of the system.
Description
Technical field
The utility model relates to the industrial automation field, relates more specifically to a kind of automatic compensating signal acquisition system that is used for accurate check weighing equipment.
Background technology
Along with the step that electronic technology burns the wind, industrial automation system guiding each item control technology to sooner, more smart, more accurate direction develops rapidly.Realizing the industrial circle of robotization control through gathering real-time gravimetric value; Like all kinds of scenes that road and bridge, building, chemical industry, feed, fertilizer, metallurgy or the like need to realize robotizations controls such as packing, batching, check weighing, dynamometry, generally all be provided with the weight signal acquisition system and control to realize robotization.As shown in Figure 1; Above-mentioned weight signal acquisition system generally comprises reference circuit 16, LOAD CELLS 15, signal amplification circuit 14, filtering circuit 13, A/D change-over circuit 12 and microcontroller (MCU) 11, wherein, adopts LOAD CELLS 15 to carry out the weight signal collection; And then carry out processing such as filtering, amplification; Realize by the conversion of analog quantity through A/D change-over circuit 12, read the digital signal that is converted to by the control kernel MCU11 of system again, calculate the corresponding real-time gravimetric value to digital quantity; The real-time gravimetric value of last basis carries out corresponding logic control to the system at scene, reaches the purpose to the real-time robotization control of using system.
Yet, based on above-mentioned weight signal acquisition system, in process of real-time data acquisition, because all can there be certain unstable characteristic in the each several part circuit in the system, the interference that brings like the internal driving of cable and long Distance Transmission; The variation of the temperature drift of application resistance, electric capacity, the enlargement factor that creep brings; The data that the temperature drift of A/D chip itself, creep or the like, these factors all can cause collecting are compared with actual value and are had deviation, make the precision of control system and accuracy receive the influence that can't go beyond.
Therefore, thus be necessary to provide a kind of signal acquiring system to address the aforementioned drawbacks with accuracy of detection and the accuracy that improves system with automatic compensation function.
The utility model content
The purpose of the utility model provides a kind of automatic compensating signal acquisition system that is applicable to accurate check weighing equipment, and this automatic compensating signal acquisition system has higher detection degree of accuracy and accuracy.
To achieve these goals; The automatic compensating signal acquisition system that the utility model provides comprises power module, microcontroller, reference circuit, A/D change-over circuit, hardware filtering circuit, amplifying circuit and LOAD CELLS; Comprise compensating module in addition; Said compensating module comprises analog switching circuit and bleeder circuit; Said LOAD CELLS is exported a pair of feedback signal to said bleeder circuit and reference circuit; Said reference circuit is handled according to said feedback signal and to said A/D change-over circuit output reference voltage, said bleeder circuit carries out dividing potential drop and produces reference signal said feedback signal, said analog switching circuit alternately gather from the output signal of said LOAD CELLS and from the reference signal of said bleeder circuit to confirm circuit deviations and then to realize circuit compensation.
In the utility model one preferred embodiment, said LOAD CELLS is the resistance-strain bridge type magnetic sensor.
Preferably, said bleeder circuit comprises voltage follower and is connected in some precision resistances of the output terminal of said voltage follower.
Preferably, said voltage follower comprises two operational amplifiers and is connected to the resistance R 1 and the R2 of said two operational amplifier input ends that said some precision resistances comprise resistance R 3, R4 and the R5 of series connection successively.
Preferably, the supply voltage of the said LOAD CELLS of said electric power source pair of module is 5V, and the supply voltage of said operational amplifier is 10V, and the resistance value of said resistance R 3, R4 and R5 is respectively 24.9K ohm, 100 ohm and 24.9K ohm.
Equally preferably; Said analog switching circuit comprises the ADG409BR chip; Said ADG409BR chip comprises that two are connected to the control pin of said microcontroller, and said microcontroller produces control signal through said control pin to said ADG409BR chip and realizes that signal replaces acquisition controlling.
Compared with prior art; LOAD CELLS in the automatic compensating signal acquisition system that the utility model provides adopts six line systems to connect and bleeder circuit and reference circuit is exported a pair of feedback signal; Reference circuit is according to feedback signal and to A/D change-over circuit output reference voltage and then realize the long line compensation to the sensor transmissions cable; And being used of bleeder circuit and analog switching circuit can be switched collection with temperature compensation and compensation of ageing in the realization circuit to actual signal and reference signal, thus the degree of accuracy and the accuracy that have improved system widely.
Through following description and combine accompanying drawing, it is more clear that the utility model will become, and these accompanying drawings are used to explain the embodiment of the utility model.
Description of drawings
Fig. 1 is the electrical block diagram of existing weight signal acquisition system.
Fig. 2 is the electrical block diagram of automatic compensating signal acquisition system one embodiment of the utility model.
Fig. 3 is the synoptic diagram of bleeder circuit and reference circuit in the automatic compensating signal acquisition system shown in Figure 1.
Fig. 4 is the synoptic diagram of analog switching circuit in the automatic compensating signal acquisition system shown in Figure 1.
Each description of reference numerals is following among the figure:
Microcontroller 11 A/D change-over circuits 12
LOAD CELLS 15 reference circuits 16
Compensating module 17 analog switching circuits 171
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the embodiment is carried out clear, intactly description, similar assembly label is represented similar assembly in the accompanying drawing.Obviously, below only be the utility model part embodiment with the embodiment that describes, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
At first please with reference to Fig. 2, Fig. 2 has showed the electrical block diagram of automatic compensating signal acquisition system one embodiment of the utility model.As shown in Figure 2; The automatic compensating signal acquisition system that the utility model provides comprises microcontroller (MCU) 11, A/D change-over circuit 12, hardware filtering circuit 13, amplifying circuit 14, LOAD CELLS 15, reference circuit 16, compensating module 17 and is the power module 18 of above-mentioned each circuit module power supply; Wherein, said microcontroller 11, A/D change-over circuit 12, hardware filtering circuit 13, amplifying circuit 14, compensating module 17 and LOAD CELLS 15 link to each other successively.Preferably; In the present embodiment; Said compensating module 17 comprises analog switching circuit 171 and bleeder circuit 172; Said LOAD CELLS 15 adopts resistance-strain bridge type magnetic sensors 15, and said resistance-strain bridge type magnetic sensor 15 carries out six line systems through some transmission cables 19 and said compensating module 17 and is connected and produced three pairs of sets of signals, comprising the feedback signal SN+ and the SN-of confession bridge voltage signal EX+ and EX-, signal of sensor SI+ and SI-and sensor.
Fig. 3 has showed the circuit structure of bleeder circuit 172 and reference circuit 16 in the automatic compensating signal acquisition system of the utility model.With reference to Fig. 2 and Fig. 3; Said reference circuit 16 is connected between A/D change-over circuit 12 and the bleeder circuit 172; Wherein, operational amplifier U2B selects high-accuracy budget amplifier OPA2277/OP2177AR for use, and resistance R 6, R7, R8 and R9 all adopt precision resistance to realize accurate regulation and control.Feedback signal SN+ and SN-that said reference circuit 16 receives from said LOAD CELLS 15 carry out the input impedance adjusting according to said feedback signal SN+ and SN-and export REF+ and the reference voltage of REF-two signals to be gathered as said A/D change-over circuit 12.Based on this circuit design; When system supplies bridge voltage signal EX because the influence of transmission course when causing voltage fluctuation; The output signal SI of resistance-strain bridge type magnetic sensor 15 can follow the variation that supplies bridge voltage signal EX and change; Simultaneously because feedback signal SN passes through transmission cable 16 with confession bridge voltage signal EX and output signal SI; Can in transmission course, receive same influence, then the value of feedback signal SN also can be followed the variation that supplies bridge voltage signal EX and changed, and the reference voltage REF that also gathers with regard to explanation A/D change-over circuit 12 also can follow the variation that supplies bridge voltage signal EX and change; Even so because the transmission cable influence causes voltage fluctuation; But the fluctuation of the reference voltage REF of signal of sensor SI and A/D change-over circuit 12 all is synchronous, and then the variation that influenced by transmission cable to cause of the numerical value that comes out of A/D change-over circuit 12 conversion will be very little, reaches transmission cable is realized the purpose that long line compensates; In the system that adopts this scheme, the transmission cable of sensor can reach the precision that 150m can guarantee that still the A/D of system gathers.
Continuation is with reference to Fig. 2 and Fig. 3; In this specific embodiment; Said bleeder circuit 172 comprises two operational amplifier U2A and U2B and resistance R 1, R2, R3, R4 and R5; Said resistance R 2 is connected to the input end of said operational amplifier U2A and U2B and forms voltage follower together with R1; And resistance R 3, R4 and R5 are precision resistance, and its output terminal that is series at said voltage follower successively is to carry out dividing potential drop, and wherein said operational amplifier U2A and U2B all select for use high-accuracy budget amplifier OPA2277/OP2177AR to realize accurate the processing.Preferably; In the present embodiment; The supply voltage of 18 pairs of said LOAD CELLSs 15 of said power module (promptly supplying bridge voltage signal EX) is 5V; The supply voltage of said operational amplifier U2A and U2B is 10V, and the resistance value of resistance R 1 and R2 is 100 ohm, when gain A 0 value 499 of amplifying circuit 14; The resistance value of said precision resistance R3, R4 and R5 adopts 24.9K ohm (Ω), 100 ohm and 24.9K ohm respectively, and the value via the reference signal SRE that obtains after these bleeder circuit 172 dividing potential drops is EX/A0=5/499 so.
Fig. 4 has showed the circuit structure of analog switching circuit 171 in the automatic compensating signal acquisition system of the utility model.Please with reference to Fig. 4 and combine Fig. 2 and Fig. 3; Analog switching circuit 171 in the present embodiment comprises the ADG409BR chip; Said ADG409BR chip comprises that two are connected to the control pin A0 and the A1 of said microcontroller 11; Said microcontroller 11 is realized the switching of signal to said ADG409BR chip generation control signal AA0 and AA1 through said control pin A0 and A1; Comprising alternately gather from the output signal SI+ of said LOAD CELLS 15 and SI-and from the reference signal SRE+ of said bleeder circuit 172 and SRE-with definite circuit deviations, thereby the realization circuit compensation.In addition, to be connected with differential pressure be that two SRE signals of 0 are realized zero compensation and sensitivity compensation for the input end S1A of ADG409BR chip and S1B in the present embodiment, thus the further compensate function of sophisticated systems.
With reference to Fig. 2 to Fig. 4; Based on the foregoing circuit structure, the value after amplifying via amplifying circuit 14 from the reference signal SRE of bleeder circuit 172 be still EX (EX/A0 * A0=EX), at this moment; This reference signal SRE and reference voltage REF are compared, and the A/D sign indicating number that comes out that converts is a steady state value.Therefore; Can certain once be used as reference value to the collection result of this signal; After this numerical value that collects all compares with this reference value, then can learn in the system because the influence of amplifying circuit 14, hardware filtering circuit 13 and A/D change-over circuit 12 causes having occurred great deviation, more above-mentioned deviation is converted to the numerical value magnitude to the SI signals collecting according to the relation of linearity; And then the SI deviation of signal that occurs deducted, then can be compensated the actual numerical value after the influence of power down road.For example, gather the A/D value according to 20 significance bits, then when output signal SI equated with reference value, system's output should be full code value 1048576.Because the theoretical signal that obtains to be equivalent to the EX value after reference signal is amplified, reference voltage REF value is the EX value, and then transformation result is a value near full sign indicating number; Be assumed to be 986530,, find that this value collection gained becomes 985600 if after after a while; Can know that through computing deviate is 930; Think that then 930 deviation has appearred being to the maximum in system, if this moment to the SI signals collecting to numerical value be 356460, the deviation that we just can be converted to this moment appearance according to linear relationship should be 336; Then we just can think that the actual acquisition value of SI signal should be 356460-336=356124, reaches the temperature compensation purpose to signals collecting.In like manner, compare, can the skew of parameter be compensated, reach to circuit system compensation of ageing purpose through switching collection to signal SI and reference signal SRE.
In addition, because the changing value that grasps zero point that can be real-time in gatherer process so in signal acquisition process, can the collection value deducted the changing value at zero point and obtain actual numerical value, be realized zero compensation; And owing to get the cicada changing value at zero point; Simultaneously according to above-mentioned analysis to compensating form; Can know the changing value of system near maximal value the time through gathering the SRE signal value; According to by then realizing the changing value of any collection value is compensated to peaked linear relationship zero point, realize the sensitivity compensation of system.
As stated; LOAD CELLS 15 in the automatic compensating signal acquisition system that the utility model provides adopts six line systems to connect and bleeder circuit 172 and reference circuit 16 is exported a pair of feedback signal; Reference circuit 16 is according to feedback signal and to A/D change-over circuit 12 output reference voltages and then realize the long line compensation to the sensor transmissions cable; And being used of bleeder circuit 172 and analog switching circuit 171 can be switched collection to realize temperature compensation and the compensation of ageing in the circuit to actual signal and reference signal; Wherein, Temperature compensation and compensation of ageing have comprised the compensate function to zero point and two parts of sensitivity (gain) again, thus the degree of accuracy and the accuracy that have improved system widely.Through test, in the automatic compensating signal acquisition system of the utility model of above-mentioned technology, the length of the transmission cable 19 of LOAD CELLS 15 can reach 150m; In-20 ℃ to 60 ℃ temperature ranges, system's property at high and low temperature at zero point can reach 5ppm/10 ℃, and highly sensitive low-temperature characteristics can reach 10ppm/10 ℃; Under the room temperature condition, long-time aging characteristics reach 10ppm/.
More than combine most preferred embodiment that the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to the essence of the utility model.
Claims (6)
1. automatic compensating signal acquisition system; Be applicable to accurate check weighing equipment; Said automatic compensating signal acquisition system comprises power module, microcontroller, reference circuit, A/D change-over circuit, hardware filtering circuit, amplifying circuit and LOAD CELLS; It is characterized in that: also comprise compensating module; Said compensating module comprises analog switching circuit and bleeder circuit; Said LOAD CELLS is exported a pair of feedback signal to said bleeder circuit and reference circuit; Said reference circuit carries out according to said feedback signal that input impedance is regulated and to said A/D change-over circuit output reference voltage, said bleeder circuit carries out dividing potential drop and produces reference signal said feedback signal, said analog switching circuit alternately gather from the output signal of said LOAD CELLS and from the reference signal of said bleeder circuit to confirm circuit deviations and then to realize circuit compensation.
2. automatic compensating signal acquisition system as claimed in claim 1 is characterized in that: said LOAD CELLS is the resistance-strain bridge type magnetic sensor.
3. automatic compensating signal acquisition system as claimed in claim 1 is characterized in that: said bleeder circuit comprises voltage follower and is connected in some precision resistances of the output terminal of said voltage follower.
4. automatic compensating signal acquisition system as claimed in claim 3; It is characterized in that: said voltage follower comprises two operational amplifiers and is connected to the resistance R 1 and the R2 of the input end of said two operational amplifiers that said some precision resistances comprise resistance R 3, R4 and the R5 of series connection successively.
5. automatic compensating signal acquisition system as claimed in claim 4; It is characterized in that: the supply voltage of the said LOAD CELLS of said electric power source pair of module is 5V; The supply voltage of said operational amplifier is 10V, and the resistance value of said resistance R 3, R4 and R5 is respectively 24.9K ohm, 100 ohm and 24.9K ohm.
6. automatic compensating signal acquisition system as claimed in claim 1; It is characterized in that: said analog switching circuit comprises the ADG409BR chip; Said ADG409BR chip comprises that two are connected to the control pin of said microcontroller, and said microcontroller produces control signal through said control pin to said ADG409BR chip and realizes that signal replaces acquisition controlling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204012387U CN202305000U (en) | 2011-10-19 | 2011-10-19 | Automatic compensation signal acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204012387U CN202305000U (en) | 2011-10-19 | 2011-10-19 | Automatic compensation signal acquisition system |
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| CN202305000U true CN202305000U (en) | 2012-07-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506982A (en) * | 2011-10-19 | 2012-06-20 | 深圳市杰曼科技有限公司 | Automatic compensating signal acquiring system |
| CN102829853A (en) * | 2012-08-22 | 2012-12-19 | 中联重科股份有限公司 | Transmitter, multistage filter and weighing system |
| CN104406670A (en) * | 2014-11-27 | 2015-03-11 | 北京万集科技股份有限公司 | Dynamic weighing method and dynamic weighing system based on charge and discharge of capacitor |
| CN104457950A (en) * | 2014-11-21 | 2015-03-25 | 广西智通节能环保科技有限公司 | Electronic pressure weighing system |
| CN109738593A (en) * | 2019-03-01 | 2019-05-10 | 杭州北芯传感科技有限公司 | Multiple sensor controlable electric current and VOC gas sensor aging device |
| CN114199353A (en) * | 2021-12-09 | 2022-03-18 | 上海辰竹仪表有限公司 | Strain bridge input sampling circuit and weighing system |
-
2011
- 2011-10-19 CN CN2011204012387U patent/CN202305000U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506982A (en) * | 2011-10-19 | 2012-06-20 | 深圳市杰曼科技有限公司 | Automatic compensating signal acquiring system |
| CN102506982B (en) * | 2011-10-19 | 2014-06-04 | 深圳市杰曼科技有限公司 | Automatic compensating signal acquiring system |
| CN102829853A (en) * | 2012-08-22 | 2012-12-19 | 中联重科股份有限公司 | Transmitter, multistage filter and weighing system |
| CN102829853B (en) * | 2012-08-22 | 2015-12-09 | 中联重科股份有限公司 | Transmitter, multistage filter and weighing system |
| CN104457950A (en) * | 2014-11-21 | 2015-03-25 | 广西智通节能环保科技有限公司 | Electronic pressure weighing system |
| CN104406670A (en) * | 2014-11-27 | 2015-03-11 | 北京万集科技股份有限公司 | Dynamic weighing method and dynamic weighing system based on charge and discharge of capacitor |
| CN104406670B (en) * | 2014-11-27 | 2017-01-25 | 北京万集科技股份有限公司 | Dynamic weighing method and dynamic weighing system based on charge and discharge of capacitor |
| CN109738593A (en) * | 2019-03-01 | 2019-05-10 | 杭州北芯传感科技有限公司 | Multiple sensor controlable electric current and VOC gas sensor aging device |
| CN114199353A (en) * | 2021-12-09 | 2022-03-18 | 上海辰竹仪表有限公司 | Strain bridge input sampling circuit and weighing system |
| CN114199353B (en) * | 2021-12-09 | 2024-03-05 | 上海辰竹仪表有限公司 | Strain bridge input sampling circuit and weighing system |
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| GR01 | Patent grant | ||
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Address after: 518000, Guangdong, Nanshan District, Shenzhen hi tech Industrial Park (North District), 2 dream Creek Road, 6 cool information port, 6 floor Patentee after: SHENZHEN GENERAL MEASURE TECHNOLOGY CO., LTD. Address before: 518000, Guangdong, Nanshan District, Shenzhen hi tech Industrial Park (North District), 2 dream Creek Road, 6 cool information port, 6 floor Patentee before: Shenzhen General Measure Technology Co., Ltd. |
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Granted publication date: 20120704 |