CN204730975U - Can the pressure unit of promotion signal conversion accuracy - Google Patents
Can the pressure unit of promotion signal conversion accuracy Download PDFInfo
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- CN204730975U CN204730975U CN201520492933.7U CN201520492933U CN204730975U CN 204730975 U CN204730975 U CN 204730975U CN 201520492933 U CN201520492933 U CN 201520492933U CN 204730975 U CN204730975 U CN 204730975U
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Abstract
Can the pressure unit of promotion signal conversion accuracy, comprise XTR101 integrated circuit, the first potentiometer, the second potentiometer, the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, NPN triode and counnter attack diode.What the utility model provided can the pressure unit of promotion signal conversion accuracy, by two-wire system electric current loop sending pressure signal, can improve the antijamming capability of pressure signal, reduces loss of signal, improve signal conversion accuracy.
Description
Technical field
The utility model relates to sensor detecting field, particularly a kind of can the pressure unit of promotion signal conversion accuracy.
Background technology
Pressure transducer is a kind of sensor the most conventional in industrial practice, it is widely used in various industrial automatic control environment, relates to numerous industries such as water conservancy and hydropower, railway traffic, intelligent building, production automatic control, Aero-Space, military project, petrochemical industry, oil well, electric power, boats and ships, lathe, pipeline.Pressure transducer is for experiencing the pressure of liquid, gas or steam to produce pressure signal, pressure signal, through the pressure unit of promotion signal conversion accuracy being transformed into 4 ~ 20mA DC signal output, carries out measuring, indicating and procedure regulation to supply the secondary instruments such as indicator alarm, registering instrument, regulator.Pressure transducer divides capacitance pressure transducer, diffusion silicon pressure sensor, ceramic pressure sensor and strain pressure transducer etc.
In commercial Application, pressure transducer is all mounted near test point, and display device or opertaing device are generally all on pulpit or switch board, and distance may tens of rice extremely hundreds of rice between the two.And signal is easy to be subject to external interference and produces loss in long range propagation process, finally affect the conversion accuracy of pressure signal, therefore need to provide that a kind of antijamming capability is strong, loss of signal is little can the pressure unit of promotion signal conversion accuracy.
Utility model content
Problem to be solved in the utility model be to provide a kind of can the pressure unit of promotion signal conversion accuracy, adopt two-wire system electric current loop sending pressure signal, to improve signal antijamming capability, to reduce loss of signal.
For solving the problem, the utility model provide a kind of can the pressure unit of promotion signal conversion accuracy, comprise XTR101 integrated circuit, the first potentiometer, the second potentiometer, the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, NPN triode and counnter attack diode, the pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer and the moving contact of described second potentiometer, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity, the other end of described second electric capacity, one end of described 3rd electric capacity, one end of described first resistance and one end of described 4th electric capacity and as described can the negative output terminal of pressure unit of promotion signal conversion accuracy, the pin 8 of described XTR101 integrated circuit connects one end of described 3rd resistance, the other end of described 4th electric capacity and the negative pole of described counnter attack diode, the pin 9 of described XTR101 integrated circuit connects the emitter of described NPN triode, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 12 of described XTR101 integrated circuit connects the base stage of described NPN triode, the collector of described NPN triode connects the other end of described 3rd resistance, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance, the other end of described second resistance connects the moving contact of described first potentiometer, the other end of described first resistance connects the described other end of the 3rd electric capacity and the earth terminal of pressure transducer, the positive pole of described counnter attack diode as described can the positive output end of pressure unit of promotion signal conversion accuracy.
XTR101 integrated circuit includes high precision table amplifier, a voltage to current converter and two identical 1mA precision constant current sources, the current signal that the voltage signal of pressure transducer automatically can be transformed to standard transmits, simultaneously for pressure transducer is powered, do not need additionally for pressure transducer provides power supply.Transmit owing to pressure signal to be converted to two-wire system DC current, the current signal antijamming capability of transmission is strong and can overcome the defect that long range propagation makes voltage drop, namely reduces loss of signal.Further, described NPN triode, for reducing the trueness error brought due to temperature variation, improves the conversion accuracy of pressure signal further.
Optionally, the maximum resistance of described first potentiometer is 100k Ω, and the maximum resistance of described second potentiometer is 100 Ω.
Optionally, the resistance value of described first resistance is 2.5k Ω.
Optionally, the resistance value of described second resistance is 1M Ω.
Optionally, the resistance value of described 3rd resistance is 750 Ω.
Optionally, described pressure transducer is MPX7200 integrated circuit.
Optionally, the capacitance of described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity is 0.01 μ F.
Compared with prior art, the utility model has the following advantages:
What the utility model provided can the pressure unit of promotion signal conversion accuracy, by MPX7200 integrated circuit, pressure signal is converted to the transmission of two-wire system DC current signal, the current signal antijamming capability of transmission is strong and can overcome the defect that long range propagation makes voltage drop, namely reduces loss of signal.Further, MPX7200 integrated circuit can be that pressure transducer is powered by built-in precision constant current source, does not need, additionally for pressure transducer provides power supply, to reduce the cost of pressure detection.
Accompanying drawing explanation
Fig. 1 be the utility model embodiment can the structural representation of pressure unit of promotion signal conversion accuracy.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Fig. 1 be the utility model embodiment can the structural representation of pressure unit of promotion signal conversion accuracy, describedly the pressure unit of promotion signal conversion accuracy can comprise XTR101 integrated circuit, the first potentiometer W1, the second potentiometer W1, the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, NPN triode Q1 and counnter attack diode D1.
Particularly, the pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer W1, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer W1, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity C1 and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity C2 and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer W2, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer W2 and the moving contact of described second potentiometer W2, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity C1, the other end of described second electric capacity C2, one end of described 3rd electric capacity C3, one end of described first resistance R1 and one end of described 4th electric capacity C4 and as described can the negative output terminal of pressure unit of promotion signal conversion accuracy, the pin 8 of described XTR101 integrated circuit connects one end of described 3rd resistance R3, the other end of described 4th electric capacity C4 and the negative pole of described counnter attack diode D1, the pin 9 of described XTR101 integrated circuit connects the emitter of described NPN triode Q1, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 12 of described XTR101 integrated circuit connects the base stage of described NPN triode Q1, the collector of described NPN triode Q1 connects the other end of described 3rd resistance R3, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance R2, the other end of described second resistance R2 connects the moving contact of described first potentiometer W1, the other end of described first resistance R1 connects the described other end of the 3rd electric capacity C3 and the earth terminal of pressure transducer, the positive pole of described counnter attack diode D1 as described can the positive output end of pressure unit of promotion signal conversion accuracy.Described can the positive output end of pressure unit of promotion signal conversion accuracy be circulation injection side, is namely suitable for the anode connecting external dc voltage source; Described can the negative output terminal of pressure unit of promotion signal conversion accuracy be circulation output terminal, is namely suitable for the negative terminal being connected external dc voltage source by external load resistors.
Can selecting according to practical application of described pressure transducer.In the present embodiment, for described pressure transducer for X-type silicon pressure sensor MPX7200 is described.The sensing unit of pressure transducer MPX7200 is the piece transverse piezoresistive strain gauge that arrangement forms cross shape on silicon diaphragm.When electric current passes through the axis of this cross strainometer, perpendicular other direction just can produce the output signal be directly proportional to pressure.Because the signalling channel of pressure transducer MPX7200 is short, thus its anti-noise degree is very high.
When the pressure chamber pressurized of pressure transducer MPX7200, its positive output end (2 pin of pressure transducer MPX7200) and negative output terminal (4 pin of pressure transducer MPX7200) export corresponding voltage signal to the pin 3 of described XTR101 integrated circuit and the pin 4 of described XTR101 integrated circuit, after described XTR101 lsi internal circuit amplification, voltage/current conversion and described NPN triode Q1 amplify, export corresponding 4 ~ 20mA electric current by the pin 7 of described XTR101 integrated circuit and the pin 8 of described XTR101 integrated circuit to current loop.
The pin 14 external described first potentiometer W1 and described second resistance R2 of the pin 1 of described XTR101 integrated circuit, the pin 2 of described XTR101 integrated circuit and described XTR101 integrated circuit, forms initial zero setting circuit, namely regulates 4mA initial zero position; The pin 5 of described XTR101 integrated circuit and the external described second potentiometer W2 of the pin 6 of described XTR101 integrated circuit, can expire amplitude by regulation output; The pin 10 of described XTR101 integrated circuit and the pin 11 of described XTR101 integrated circuit export 1mA constant current respectively, namely provide the constant current-supplying of 2mA to pressure transducer MPX7200.Describedly pin 3 filtering that described first electric capacity C1 is described XTR101 integrated circuit can be also set for the pressure unit of promotion signal conversion accuracy, pin 4 filtering that described second electric capacity C2 is described XTR101 integrated circuit is set, the interference in input signal can be reduced, improve the precision of pressure detection.Describedly the pin 7 and pin 8 filtering that described 4th electric capacity C4 is described XTR101 integrated circuit can be also set for the pressure unit of promotion signal conversion accuracy, the interference in outputing signal can be reduced.The steady current that described XTR101 integrated circuit improves is converted to voltage by described first resistance R1, and described 3rd electric capacity C3 is parallel to the two ends of described first resistance R1, carries out filtering process to the pressure reduction at described first resistance R1 two ends.Described NPN triode Q1, for reducing the trueness error brought due to temperature variation, improves the conversion accuracy of pressure signal further.Described 3rd resistance R3 is connected to the collector of described NPN triode Q1, for ensureing that the power consumption of described NPN triode Q1 is less than the specification requirement of pipe.
In the present embodiment, the maximum resistance of described first potentiometer W1 is 100k Ω, the maximum resistance of described second potentiometer W2 is 100 Ω, the resistance value of described first resistance R1 is 2.5k Ω, the resistance value of described second resistance R2 is 1M Ω, the resistance value of described 3rd resistance R3 is 750 Ω, and the capacitance of described first electric capacity C1, described second electric capacity C2, described 3rd electric capacity C3 and described 4th electric capacity C4 is 0.01 μ F.It should be noted that, the parameter of above-mentioned each device also can adjust when circuit debugging.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (7)
1. one kind can the pressure unit of promotion signal conversion accuracy, it is characterized in that, comprise XTR101 integrated circuit, the first potentiometer, the second potentiometer, the first resistance, the second resistance, the 3rd resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, NPN triode and counnter attack diode;
The pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer and the moving contact of described second potentiometer, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity, the other end of described second electric capacity, one end of described 3rd electric capacity, one end of described first resistance and one end of described 4th electric capacity and as described can the negative output terminal of pressure unit of promotion signal conversion accuracy, the pin 8 of described XTR101 integrated circuit connects one end of described 3rd resistance, the other end of described 4th electric capacity and the negative pole of described counnter attack diode, the pin 9 of described XTR101 integrated circuit connects the emitter of described NPN triode, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 12 of described XTR101 integrated circuit connects the base stage of described NPN triode, the collector of described NPN triode connects the other end of described 3rd resistance, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance, the other end of described second resistance connects the moving contact of described first potentiometer, the other end of described first resistance connects the described other end of the 3rd electric capacity and the earth terminal of pressure transducer, the positive pole of described counnter attack diode as described can the positive output end of pressure unit of promotion signal conversion accuracy.
2. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, the maximum resistance of described first potentiometer is 100k Ω, and the maximum resistance of described second potentiometer is 100 Ω.
3. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, the resistance value of described first resistance is 2.5k Ω.
4. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, the resistance value of described second resistance is 1M Ω.
5. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, the resistance value of described 3rd resistance is 750 Ω.
6. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, described pressure transducer is MPX7200 integrated circuit.
7. according to claim 1 can the pressure unit of promotion signal conversion accuracy, it is characterized in that, the capacitance of described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity is 0.01 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520492933.7U CN204730975U (en) | 2015-07-10 | 2015-07-10 | Can the pressure unit of promotion signal conversion accuracy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520492933.7U CN204730975U (en) | 2015-07-10 | 2015-07-10 | Can the pressure unit of promotion signal conversion accuracy |
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| CN204730975U true CN204730975U (en) | 2015-10-28 |
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| CN201520492933.7U Expired - Fee Related CN204730975U (en) | 2015-07-10 | 2015-07-10 | Can the pressure unit of promotion signal conversion accuracy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043644A (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Pressure transmitter capable of ensuring stability of output signals |
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2015
- 2015-07-10 CN CN201520492933.7U patent/CN204730975U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043644A (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Pressure transmitter capable of ensuring stability of output signals |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20180710 |