CN203287022U - Strain sensor simulator - Google Patents
Strain sensor simulator Download PDFInfo
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- CN203287022U CN203287022U CN2013203626997U CN201320362699U CN203287022U CN 203287022 U CN203287022 U CN 203287022U CN 2013203626997 U CN2013203626997 U CN 2013203626997U CN 201320362699 U CN201320362699 U CN 201320362699U CN 203287022 U CN203287022 U CN 203287022U
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Abstract
The utility model discloses a strain sensor simulator, comprising a sensor interface, a precision resistor network, a common-mode voltage conversion circuit, an output signal generation circuit, a DA conversion circuit, a reference voltage generation circuit, a control system and a temperature sensor. The sensor interface, the precision resistor network, the common-mode voltage conversion circuit and the output signal generation circuit are connected in sequence, the reference voltage generation circuit is connected to the sensor interface, the common-mode voltage conversion circuit and the DA conversion circuit, the control system is connected to the temperature sensor and the DA conversion circuit, and the DA conversion circuit is connected to the output signal generation circuit; the sensor interface is connected to an external measuring instrument; the reference voltage generation circuit generates positive and negative reference source voltage according to voltage outputted by the common-mode voltage conversion circuit and positive voltage outputted by the sensor interface; and the DA conversion circuit generates DA output voltage according to the positive and negative reference source voltage and a set digital value, and then generates an output analog signal together with the voltage output by the common-mode voltage conversion circuit, and the output analog signal is output to the external measuring instrument through the sensor interface.
Description
Technical field
The utility model relates to a kind of strain gauge transducer simulator, relates in particular to a kind of precision resister strain gauge transducer simulator.
Background technology
Producing, maintenance, check is various while with strain gauge transducer, being output as the measurement instrument of input signal, usually will carry out with the pin-point accuracy stabilized voltage supply every error of measurement instrument as standard signal.The price of pin-point accuracy stabilized voltage supply is more expensive on the one hand, and on the other hand, the pin-point accuracy stabilized voltage supply will be used in conjunction with the pin-point accuracy voltage table, is not easy to on-the-spot the use.Therefore, in the process of production practices, often need to adopt that sensor simulator unit is checked, the experimental measurement instrument.
Existing a kind of sensor simulator unit as shown in Figure 1, is to utilize common mode voltage and the DAC digital to analog converter negative voltage reference source of the dividing point voltage of precision resistance network as output signal, thereby has eliminated because of common-mode voltage variation the output signal impact at zero point.
But, although existing this sensor simulator unit circuit has been eliminated the impact of common mode voltage on zero point, but the output signal of DAC circuit has had influence on the value of common mode voltage after by operational amplifier, resistance R 5, resistance R 3, only make when zero point common mode voltage be only R1 and the R2 dividing potential drop to the input generating positive and negative voltage, thereby causing effective output of signal and the setting value of DAC is not linear relationship, makes between setting value and real output value and has systematic error to exist.
The utility model content
The purpose of this utility model is the deficiency that has error in order to overcome effective output of existing in prior art and default, and a kind of high precision strain gauge transducer simulator is provided.
In order to achieve the above object, the utility model embodiment discloses a kind of strain gauge transducer simulator, comprising: sensor interface, precision resistance network, common mode voltage change-over circuit, output signal generative circuit, DA change-over circuit, reference voltage generating circuit, control system and temperature sensor; Wherein, described sensor interface, precision resistance network, common mode voltage change-over circuit are connected successively with described output signal generative circuit, described reference voltage generating circuit is connected in described sensor interface, common mode voltage change-over circuit and DA change-over circuit, described control system is connected in described temperature sensor and described DA change-over circuit, and described DA change-over circuit is connected with described output signal generative circuit; Described sensor interface connects externally measured instrument, and positive voltage and the negative voltage of the network based described sensor interface input of described precision resistance generate common mode voltage, pass to described common mode voltage change-over circuit; The positive voltage that described reference voltage generating circuit is exported according to voltage and the described sensor interface of described common mode voltage change-over circuit output generates the positive and negative reference source voltage of described DA change-over circuit; Described DA change-over circuit, according to described positive and negative reference source voltage with after setting digital quantity generation DA output voltage, is transferred to described output signal generative circuit; Described output signal generative circuit, according to the voltage of described common mode voltage change-over circuit output and the DA output voltage of DA change-over circuit generation, generates outputting analog signal, and described outputting analog signal is exported to described externally measured instrument by described sensor interface; The temperature signal that described control system records according to described temperature sensor, revise the output signal of described DA change-over circuit, realizes temperature compensation.
Further, described precision network circuit comprises the first resistance and the second resistance that is in series, and described the first resistance is connected with the positive voltage terminal of described sensor interface, and described the second resistance is connected with the negative voltage side of described sensor interface; Wherein, the described common mode voltage of the dividing potential drop between described the first resistance and the second resistance for generating.
Further, described the first resistance is identical with the resistance of the second resistance.
Further, the voltage follower of described common mode voltage change-over circuit for by the first operational amplifier, being formed, the voltage of its output equals the common mode voltage that described precision resistance network generates.
Further, described output signal generative circuit comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance; Wherein, described the 5th resistance connects the output terminal of described common mode voltage change-over circuit, and with described the 6th resistance, the 8th resistance, with the 7th resistance, connects successively; Described the 3rd resistance is connected with the 4th resistance, and is connected in the generating positive and negative voltage of described sensor interface; The tie point of described the 6th resistance and the 8th resistance is connected with the tie point of the 4th resistance with described the 3rd resistance; Described the 3rd resistance, the 4th resistance, the 6th resistance are identical with the resistance of the 8th resistance, and described the 5th resistance is identical with the resistance of the 7th resistance.
Further, described DA change-over circuit is comprised of DA converter and the second operational amplifier.
Further, described reference voltage generating circuit comprises: the 3rd operational amplifier, four-operational amplifier, the 5th operational amplifier, the 9th resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance and the 16 resistance; The voltage of described common mode voltage change-over circuit output is input to described the 3rd operational amplifier by described the 9th resistance, described the 3rd operational amplifier is connected into voltage follower circuit, its output equals the voltage of described common mode voltage change-over circuit output, the negative reference source of described DA converter is provided, and is input to the positive input terminal of described the 5th operational amplifier by described the 13 resistance; After the positive voltage that described the 11 resistance and the 12 resistance are inputted described sensor interface carries out dividing potential drop, be input to the positive input terminal of four-operational amplifier, described four-operational amplifier is connected into voltage follower circuit, its output is input to the positive input terminal of described the 5th operational amplifier by described the 14 resistance, two voltages provide the positive reference source of described DA converter jointly.
Further, described control system is the MSP430F149 Single Chip Microcomputer (SCM) system.
Further, the model of described temperature sensor is DS18B20.
Further, described DA converter is the DAC8871 converter.
Strain gauge transducer simulator of the present utility model is by increasing the common mode voltage change-over circuit, makes that output is real and setting value is linear, overcome effective output and default and had the deficiency of error.And the utility model embodiment also, by increasing resistor network, has reduced the output signal amplitude, has realized intense adjustment, and makes the output impedance of circuit reduce, and is beneficial to the subsequent treatment of signal.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the utility model sensor simulator unit of the prior art;
Fig. 2 is the structural representation of the strain gauge transducer simulator of the utility model embodiment;
Fig. 3 is the simulating signal generative circuit figure of the strain gauge transducer simulator of the utility model embodiment;
Fig. 4 is the structural representation of reference voltage generating circuit embodiment illustrated in fig. 2.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment that obtains, and all belong to the scope of the utility model protection.
Fig. 2 is the structural representation of the utility model sensor simulator unit of the prior art; Fig. 3 is the simulating signal generative circuit figure of the strain gauge transducer simulator of the utility model embodiment; Fig. 4 is the structural representation of reference voltage generating circuit embodiment illustrated in fig. 2.
As shown in Figure 1, the sensor simulator unit of the present embodiment comprises: sensor interface 1, precision resistance network 2, common mode voltage change-over circuit 3, output signal generative circuit 4, DA change-over circuit 5, reference voltage generating circuit 6, control system 7 and temperature sensor 8;
Wherein, described sensor interface 1, precision resistance network 2, common mode voltage change-over circuit 3 are connected successively with described output signal generative circuit 4, described reference voltage generating circuit 5 is connected in described sensor interface 1, common mode voltage change-over circuit 3 and DA change-over circuit 5, described control system 7 is connected in described temperature sensor 8 and described DA change-over circuit 5, and described DA change-over circuit 5 is connected with described output signal generative circuit 4;
Described sensor interface 1 connects externally measured instrument, and described precision resistance network 2 generates common mode voltage according to the generating positive and negative voltage of described sensor interface 1 input, passes to described common mode voltage change-over circuit 3;
The positive voltage that described reference voltage generating circuit 6 is exported according to voltage and the described sensor interface 1 of described common mode voltage change-over circuit 3 outputs generates the positive and negative reference source voltage of described DA change-over circuit 5;
Described DA change-over circuit 5, according to described positive and negative reference source voltage with after setting digital quantity generation DA output voltage, is transferred to described output signal generative circuit 4;
Described output signal generative circuit 4 is according to the voltage of described common mode voltage change-over circuit 3 outputs and the DA output voltage of DA change-over circuit generation, generate outputting analog signal, described outputting analog signal is exported to described externally measured instrument by described sensor interface 1;
Described control system 7, according to the temperature signal that described temperature sensor 8 records, is revised the output signal of described DA change-over circuit 5, realizes temperature compensation.
In the present embodiment, referring to Fig. 3, described precision network circuit 2 comprises the first resistance R 1 and the second resistance R 2 that is in series, the positive voltage terminal V of described the first resistance R 1 and described sensor interface 1
+Be connected, the negative voltage side V of described the second resistance R 2 and described sensor interface 1
-Be connected; Wherein, the described common mode voltage V of the dividing potential drop between described the first resistance R 1 and the second resistance R 2 for generating
a
In the present embodiment, described the first resistance R 1 is identical with the resistance of the second resistance R 2.
In the present embodiment, referring to Fig. 3, the voltage follower of described common mode voltage change-over circuit 3 for by the first operational amplifier U1, being formed, the voltage V of its output
rEqual the common mode voltage V that described precision resistance network 2 generates
a
In the present embodiment, referring to Fig. 3, described output signal generative circuit 4 comprises the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8; Wherein, described the 5th resistance R 5 connects the output terminal of described common mode voltage change-over circuit 3, and with described the 6th resistance R 6, the 8th resistance R 8, with the 7th resistance R 7, connects successively; Described the 3rd resistance R 3 is connected with the 4th resistance R 4, and is connected in the generating positive and negative voltage V of described sensor interface 1
+, V
-The tie point of described the 6th resistance R 6 and the 8th resistance R 8 is connected with the tie point of the 4th resistance R 4 with described the 3rd resistance R 3; Described the 3rd resistance R 3, the 4th resistance R 4, the 6th resistance R 6 are identical with the resistance of the 8th resistance R 8, and described the 5th resistance R 5 is identical with the resistance of the 7th resistance R 7.
In the present embodiment, referring to Fig. 3, described DA change-over circuit 5 is comprised of DA converter DAC and the second operational amplifier U2.In the present embodiment, described DA converter is the DAC8871 converter.
In the present embodiment, referring to Fig. 4, described reference voltage generating circuit 6 comprises: the 3rd operational amplifier U3, four-operational amplifier U4, the 5th operational amplifier U5, the 9th resistance R 9, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15 and the 16 resistance R 16; The voltage of described common mode voltage change-over circuit 2 outputs is input to described the 3rd operational amplifier U3 by described the 9th resistance R 9, and described the 3rd operational amplifier U3 is connected into voltage follower circuit, and it exports V
RefLEqual the voltage of described common mode voltage change-over circuit 2 outputs, the negative reference source of described DA converter is provided, and is input to the positive input terminal of described the 5th operational amplifier U5 by described the 13 resistance R 13; The positive voltage V of 12 pairs of described sensor interface 1 inputs of described the 11 resistance R 11 and the 12 resistance R
+After carrying out dividing potential drop, be input to the positive input terminal of four-operational amplifier U4, described four-operational amplifier U4 is connected into voltage follower circuit, and it exports V
+' being input to the positive input terminal of described the 5th operational amplifier U5 by described the 14 resistance R 14, two voltages provide the positive reference source V of described DA converter jointly
RefH
In the present embodiment, described control system 7 is the MSP430F149 Single Chip Microcomputer (SCM) system, and the model of temperature sensor 8 is DS18B20.Control system 7 receives the external setting-up digital quantity, and the digital quantity input end of external setting-up digital output to the DA converter, thereby the analog output signal amplitude of setting sensor simulator.Simultaneously, control system 7 receives the temperature signal of temperature sensor 8, automatically revises the output of DA converter with this, thereby realizes temperature compensation.
With reference to figure 3, in one embodiment, sensor interface 1 is connected with externally measured instrument (not shown).The precision resistance network is connected with R2 and is formed by R1, and resistance is elected R1=R2=1.5K Ω as, with the positive-negative power pin of sensor interface 1, is connected.
Common mode voltage change-over circuit 2 is connected into voltage follower and is formed by operational amplifier U1.Reference voltage generating circuit 6 is by the electric circuit constitute shown in Figure 4.
Output signal generative circuit 4 is comprised of resistance R 3, R4, R5, R6, R7 and R8, and resistance is elected R3=R4=R6=R8=100 Ω as, R5=R7=24.9K Ω.
Temperature sensor is selected DS18B20.
Single Chip Microcomputer (SCM) system can be selected MSP430F149.
(1) output signal is calculated
As shown in Figure 3, the high low-voltage of sensor interface 1 input is V
+, V
-, common mode voltage change-over circuit output voltage is V
r, the positive and negative reference voltage of DAC is respectively V
RefH, V
RefL, V
s-, V
s+Sensor Analog Relay System magnitude of voltage for the output of output signal generative circuit.
If the voltage that in Fig. 3, a point, S-point, S+ point, b point, c are ordered is respectively V
a, V
s-, V
s+, V
b, V
cBy circuit theory:
Formula (1) subtracts formula (2), and the concrete resistance value substitution of selecting is obtained:
V
s+-V
s-=(V
b-V
r)*0.004 （3）
In common mode voltage change-over circuit 3, operational amplifier U1 is connected into voltage follower circuit, therefore: V
r=V
a, substitution (3) formula obtains:
V
s+-V
s-=(V
b-V
a)*0.004 （4）
Owing to having added common mode voltage change-over circuit 3, there is operational amplifier U1 between a point and R5, the b point voltage does not affect the voltage that a is ordered after by R7, R8, R6, R5, therefore, the voltage that b is ordered changes, the voltage of no longer a being ordered brings impact, thus make the output signal of sensor simulator unit and b point signal linear, make namely that the output of circuit is real and setting value is linear.
(2) reference source of DAC is calculated
Learnt the output voltage V of common mode voltage change-over circuit by Fig. 3 and Fig. 4
rBe input to operational amplifier U3 by the 9th resistance R 9, and U3 is connected into voltage follower circuit, so its output V
RefLJust equal V
r, V
RefLNegative reference source for the DA converter; V
rEqual again common mode voltage V
aSo the negative reference source of DA converter equals common mode voltage V
a, that is:
V
refL=V
r=V
a （5）
Learnt the positive voltage V of the 11 resistance R 11 and 1 input of 12 pairs of sensor interfaces of the 12 resistance R by Fig. 4
+After carrying out suitable dividing potential drop, its dividing potential drop is input to the positive input terminal of operational amplifier U4, and U4 is connected into voltage follower circuit, and its output is designated as V
+', namely have:
V
+' by the 14 resistance R 14, V
RefLJointly be input to the positive input terminal of operational amplifier U5 by the 13 resistance R 13, with this, form V
RefLAnd V
+' adding circuit, choose R13=R14=3.3K Ω, R15=R16=10K Ω, the positive reference source of DA converter be above-mentioned two voltages and, that is:
V
refH=V
+'+V
refL （7）
Wherein, R11, R12 play the effect of setting suitable reference source, and the positive reference source of the DAC of its setting gets final product in the maximum allowable number value scope of the positive reference source of DAC.
Computing formula according to the output of DAC8871 chip:
Wherein, code is the digital output that control system is set.
Formula (5), formula (6), formula (7) are updated to formula (8) to be obtained:
Formula (9) is updated to formula (4) to be obtained:
This shows the setting value code of output signal amplitude and control system and V
+Linear relationship is directly proportional.But V
+Be the input positive voltage of sensor interface, for the instrument of determining, it is constant, therefore, wants what magnitude of voltage just can obtain by setting value code is set.
In sum, strain gauge transducer simulator of the present utility model is by increasing the common mode voltage change-over circuit, makes that output is real and setting value is linear, overcome effective output and default and had the deficiency of error.And the utility model embodiment also, by increasing resistor network, has reduced the output signal amplitude, has realized intense adjustment, and makes the output impedance of circuit reduce, and is beneficial to the subsequent treatment of signal.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; and be not used in and limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a strain gauge transducer simulator, is characterized in that, comprising: sensor interface, precision resistance network, common mode voltage change-over circuit, output signal generative circuit, DA change-over circuit, reference voltage generating circuit, control system and temperature sensor;
Wherein, described sensor interface, precision resistance network, common mode voltage change-over circuit are connected successively with described output signal generative circuit, described reference voltage generating circuit is connected in described sensor interface, common mode voltage change-over circuit and DA change-over circuit, described control system is connected in described temperature sensor and described DA change-over circuit, and described DA change-over circuit is connected with described output signal generative circuit;
Described sensor interface connects externally measured instrument, and positive voltage and the negative voltage of the network based described sensor interface input of described precision resistance generate common mode voltage, pass to described common mode voltage change-over circuit;
The positive voltage that described reference voltage generating circuit is exported according to voltage and the described sensor interface of described common mode voltage change-over circuit output generates the positive and negative reference source voltage of described DA change-over circuit;
Described DA change-over circuit, according to described positive and negative reference source voltage with after setting digital quantity generation DA output voltage, is transferred to described output signal generative circuit;
Described output signal generative circuit, according to the voltage of described common mode voltage change-over circuit output and the DA output voltage of DA change-over circuit generation, generates outputting analog signal, and described outputting analog signal is exported to described externally measured instrument by described sensor interface;
The temperature signal that described control system records according to described temperature sensor, revise the output signal of described DA change-over circuit, realizes temperature compensation.
2. strain gauge transducer simulator according to claim 1, it is characterized in that, described precision network circuit comprises the first resistance and the second resistance that is in series, described the first resistance is connected with the positive voltage terminal of described sensor interface, and described the second resistance is connected with the negative voltage side of described sensor interface;
Wherein, the described common mode voltage of the dividing potential drop between described the first resistance and the second resistance for generating.
3. strain gauge transducer simulator according to claim 2, is characterized in that, described the first resistance is identical with the resistance of the second resistance.
4. strain gauge transducer simulator according to claim 1, is characterized in that, the voltage follower of described common mode voltage change-over circuit for by the first operational amplifier, being formed, and the voltage of its output equals the common mode voltage that described precision resistance network generates.
5. strain gauge transducer simulator according to claim 1, is characterized in that, described output signal generative circuit comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance;
Wherein, described the 5th resistance connects the output terminal of described common mode voltage change-over circuit, and with described the 6th resistance, the 8th resistance, with the 7th resistance, connects successively; Described the 3rd resistance is connected with the 4th resistance, and is connected in the generating positive and negative voltage of described sensor interface; The tie point of described the 6th resistance and the 8th resistance is connected with the tie point of the 4th resistance with described the 3rd resistance;
Described the 3rd resistance, the 4th resistance, the 6th resistance are identical with the resistance of the 8th resistance, and described the 5th resistance is identical with the resistance of the 7th resistance.
6. strain gauge transducer simulator according to claim 1, is characterized in that, described DA change-over circuit is comprised of DA converter and the second operational amplifier.
7. strain gauge transducer simulator according to claim 6, is characterized in that, described reference voltage generating circuit comprises:
The 3rd operational amplifier, four-operational amplifier, the 5th operational amplifier, the 9th resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance and the 16 resistance;
The voltage of described common mode voltage change-over circuit output is input to described the 3rd operational amplifier by described the 9th resistance, described the 3rd operational amplifier is connected into voltage follower circuit, its output equals the voltage of described common mode voltage change-over circuit output, the negative reference source of described DA converter is provided, and is input to the positive input terminal of described the 5th operational amplifier by described the 13 resistance;
After the positive voltage that described the 11 resistance and the 12 resistance are inputted described sensor interface carries out dividing potential drop, be input to the positive input terminal of four-operational amplifier, described four-operational amplifier is connected into voltage follower circuit, its output is input to the positive input terminal of described the 5th operational amplifier by described the 14 resistance, two voltages provide the positive reference source of described DA converter jointly.
8. strain gauge transducer simulator according to claim 1, is characterized in that, described control system is the MSP430F149 Single Chip Microcomputer (SCM) system.
9. strain gauge transducer simulator according to claim 1, is characterized in that, the model of described temperature sensor is DS18B20.
10. strain gauge transducer simulator according to claim 1, is characterized in that, described DA converter is the DAC8871 converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203626997U CN203287022U (en) | 2013-06-24 | 2013-06-24 | Strain sensor simulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203626997U CN203287022U (en) | 2013-06-24 | 2013-06-24 | Strain sensor simulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103322899A (en) * | 2013-06-24 | 2013-09-25 | 北京物资学院 | Strain sensor simulator |
| CN106873473A (en) * | 2017-04-06 | 2017-06-20 | 深圳市柯雷科技开发有限公司 | A kind of whole intelligent zeroing circuit of continuously adjustabe |
| CN109781058A (en) * | 2019-01-24 | 2019-05-21 | 上海耀华称重系统有限公司 | Strain gauge load cell simulator |
-
2013
- 2013-06-24 CN CN2013203626997U patent/CN203287022U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103322899A (en) * | 2013-06-24 | 2013-09-25 | 北京物资学院 | Strain sensor simulator |
| CN103322899B (en) * | 2013-06-24 | 2016-04-13 | 北京物资学院 | A kind of strain gauge transducer simulator |
| CN106873473A (en) * | 2017-04-06 | 2017-06-20 | 深圳市柯雷科技开发有限公司 | A kind of whole intelligent zeroing circuit of continuously adjustabe |
| CN109781058A (en) * | 2019-01-24 | 2019-05-21 | 上海耀华称重系统有限公司 | Strain gauge load cell simulator |
| CN109781058B (en) * | 2019-01-24 | 2020-11-17 | 上海耀华称重系统有限公司 | Strain sensor simulator |
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