CN204740082U - Intelligence pressure transmitter circuit - Google Patents
Intelligence pressure transmitter circuit Download PDFInfo
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- CN204740082U CN204740082U CN201520350230.0U CN201520350230U CN204740082U CN 204740082 U CN204740082 U CN 204740082U CN 201520350230 U CN201520350230 U CN 201520350230U CN 204740082 U CN204740082 U CN 204740082U
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Abstract
The utility model relates to an intelligence pressure transmitter circuit, including sensor portion branch, microcontroller, AD sampling circuit, HART bus communication circuit, pressure signal acquisition circuit, temperature signal acquisition circuit, pressure signal acquisition circuit is used for the pressure signal of receiving sensor part collection to AD sampling circuit is given in the transmission, the temperature signal acquisition circuit is used for the temperature signal of receiving sensor part collection to AD sampling circuit is given in the transmission, AD sampling circuit is used for sample respectively pressure and temperature signal to transmit the pressure AD sampled value and the temperature AD sampled value that obtain for microcontroller, the HART bus communication circuit is arranged in realizing the communication between the main website industrial computer of microcontroller and the linear correction system of warm -pressing compensation for realize that the main website industrial computer is markd with temperature signal the intelligent pressure transmitter's that treats the warm -pressing compensation on line pressure and sample. This intelligence pressure transmitter circuit sampling precision is higher.
Description
Technical field
The utility model relates to pressure unit field, particularly relates to a kind of intelligent pressure transmitter circuit.
Background technology
Existing pressure unit correct on-the-spot is complicated, and efficiency is low, and its sampling precision can not meet the pressure inverting instruments and meters of 0.075% precision needed for present stage automation client, and product needed upgrading research and development demand.And existing pressure unit sensitivity is also lower.
Summary of the invention
The utility model is for the deficiencies in the prior art, provide a kind of intelligent pressure transmitter circuit, the AD sampling of 24 of this intelligent pressure transmitter circuit realiration pressure and temperature, not only increase the sampling precision of AD like this, also improve the precision of temperature and pressure compensation linear revise computing output pressure coefficient and temperature coefficient simultaneously.
The utility model is the technical scheme solving the problems of the technologies described above employing: a kind of intelligent pressure transmitter circuit, comprise Sensor section, microcontroller, AD sample circuit, HART bus communication circuit, pressure signal Acquisition Circuit, temperature signal collection circuit, the pressure signal that described pressure signal Acquisition Circuit gathers for receiving pressure/differential pressure sensor, and pass to AD sample circuit, described temperature signal collection circuit is used for the temperature signal that receiving sensor part gathers, and pass to AD sample circuit, described AD sample circuit is used for sampled pressure and temperature signal respectively, and the pressure AD sampled value obtained and temperature AD sampled value are passed to microcontroller, described HART bus communication circuit is for realizing the communication between the main website industrial computer in microcontroller and temperature and pressure compensation linear revise system, sample for realizing the pressure and temperature signal scaling of main website industrial computer to the intelligent pressure transmitter treating temperature and pressure compensation online.Sensor part is divided into pressure/differential pressure sensor.
Described pressure signal Acquisition Circuit comprises the first amplifier D1A, second amplifier D1B and some resistance, the in-phase input end of described first amplifier D1A respectively with the first output terminal of pressure transducer, one end of 2nd resistance R2 connects, the other end of the 2nd resistance R2 is connected with the output terminal of the first amplifier D1A, the inverting input of the first amplifier D1A respectively with one end of the 13rd resistance R13, one end of 15th resistance R15 connects, the other end of the 13rd resistance R13 is connected with the output terminal of the first amplifier D1A, the output terminal of the first amplifier D1A is connected with the first input end of AD sample circuit through the 1st resistance R1, the other end of the 15th resistance R15 respectively with one end of the 14th resistance R14, the inverting input of the second amplifier D1B connects, the other end of the 14th resistance R14 is connected with the output terminal of the second amplifier D1B, the in-phase input end of the second amplifier D1B respectively with the second output terminal of pressure transducer, one end of 4th resistance R4 connects, the other end of the 4th resistance R4 is connected with the output terminal of the second amplifier D1B, the output terminal of the second amplifier D1B is connected with the second input end of AD sample circuit through the 3rd resistance R3.
Described temperature signal collection circuit comprises some resistance, electric capacity, 5th one end of resistance R5 is connected with the output terminal of temperature sensor, the other end of the 5th resistance R5 respectively with one end of the 6th resistance R6, one end of 4th electric capacity C4 connects, the other end ground connection of the 6th resistance R6, the other end of the 4th electric capacity C4 respectively with one end of the 7th resistance R7, one end of 8th resistance R8, one end of 5th electric capacity C5 connects, 7th other end of resistance R7 is connected with the output terminals A VDD of power supply, the other end of the 8th resistance R8, the equal ground connection of the other end of the 5th electric capacity C5, the two ends of the 4th electric capacity C4 respectively with the 3rd of AD sample circuit, four-input terminal connects.
Spi bus is adopted to carry out communication between described microcontroller and AD sample circuit.
Described AD sample circuit adopts the ADS1241 sampling A/D chip D4 of 4 groups of difference sampling channels of 24, for completing the digital collection of pressure signal A+ and A-and temperature signal T+ and T-.
Described microcontroller adopts model to be the microcontroller of M16CM3030RFCP.
Also comprise storer, for storing the temperature and pressure compensation linear revise coefficient that main website industrial computer transmits.
Described storer adopts nonvolatile memory D2.
Described HART bus communication circuit adopts HART driving chip D11.
The beneficial effect of the utility model employing technique scheme is: the pressure differential sub-signal (N1 and COM) of sensor is transferred to the AD end of digital control plate after amplifier by connector (A+ and A-), the temperature signal (T) of sensor forms differential signal (T+ and T-) is transferred to digital control plate AD end by connector after over-sampling demarcation resistance, AD sample circuit has been used for the digital collection of pressure signal (A+ and A-) and temperature signal (T+ and T-), then the microcontroller of mainboard passes through the switching of spi bus control chip sampling channel, and read the result of current real-time pressure and temperature data signal.HART bus communication circuit is for completing the communication between PDS transmitter mainboard and temperature and pressure compensation Systematical control main website, realize main website to sample to online temperature and pressure compensation pressure/differential pressure sensor pressure and temperature signal scaling, the process of the temperature and pressure compensation linear revise of the online all the sensors of final realization, and linear revise coefficient is write to by HART bus in the nonvolatile memory of corresponding pressure sensor, the data such as linear revise coefficient are carried out preservation backup simultaneously, complete the adjustment of transmitter.
In a word, the differential signal sampling of this intelligent pressure transmitter circuit realiration pressure/differential pressure sensor digital signal, and by HART bus, the AD sampled result of digital signal is transferred to temperature and pressure compensation linear revise system, realize temperature and pressure compensation linear revise system to sample to online temperature and pressure compensation pressure/differential pressure sensor pressure and temperature signal scaling, and sampling precision is higher, sensitivity is higher, achieve the AD sampling of 24 of pressure and temperature, not only increase the sampling precision of AD like this, also improve the precision of temperature and pressure compensation linear revise computing output pressure coefficient and temperature coefficient simultaneously, the performance of improving product entirety and quality, the i.e. stability of product, repeatability, reliability, consistance and products thereof detects and exports operational precision.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of digital collection plate of the present utility model;
Fig. 2 is the circuit diagram of microcontroller of the present utility model;
Fig. 3 is the circuit diagram of AD sample circuit of the present utility model;
Fig. 4 is the circuit diagram of HART bus communication circuit of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
See Fig. 1 to Fig. 4, a kind of intelligent pressure transmitter circuit, comprise Sensor section, microcontroller, AD sample circuit, HART bus communication circuit, storer, pressure signal Acquisition Circuit, temperature signal collection circuit, described pressure signal Acquisition Circuit is used for the pressure signal that receiving sensor part gathers, and pass to AD sample circuit, described temperature signal collection circuit is used for the temperature signal that receiving sensor part gathers, and pass to AD sample circuit, described AD sample circuit is used for sampled pressure and temperature signal respectively, and the pressure AD sampled value obtained and temperature AD sampled value are passed to microcontroller, described HART bus communication circuit is for realizing the communication between the main website industrial computer in microcontroller and temperature and pressure compensation linear revise system, sample for realizing the pressure and temperature signal scaling of main website industrial computer to the intelligent pressure transmitter treating temperature and pressure compensation online.Described Sensor section comprises temperature sensor and pressure transducer, whole temperature sensor and the visual as a whole mechanical structured member of pressure transducer.Spi bus is adopted to carry out communication between described microcontroller and AD sample circuit.Microcontroller is main control unit, ADS1241 chip is controlled cell, what the communication bus between them adopted is spi bus, when carrying out pressure calibration sampling, microcontroller by spi bus to ADS1241 chip sendaisle switching command, make pressure signal output to A+ and the A-pin of ADS1241 chip, then, microcontroller reads the pressure calibration sampled result of A+ and A-passage by spi bus; In like manner complete the sampling of temperature signal.The temperature and pressure compensation linear revise coefficient that storer transmits for storing main website industrial computer.Described storer adopts nonvolatile memory D2.The model of the nonvolatile memory of the present embodiment is 25LC160.Described AD sample circuit adopts the ADS1241 sampling A/D chip D4 of 4 groups of difference sampling channels of 24, for completing the digital collection of pressure signal A+ and A-and temperature signal T+ and T-.Described microcontroller adopts model to be the microcontroller of M16CM3030RFCP.Described HART bus communication circuit adopts HART driving chip D11.The model of the HART driving chip of the present embodiment is A5191HRTP.
Described pressure signal Acquisition Circuit comprises the first amplifier D1A, second amplifier D1B and some resistance, the in-phase input end of described first amplifier D1A respectively with the first output terminal of pressure transducer, one end of 2nd resistance R2 connects, the other end of the 2nd resistance R2 is connected with the output terminal of the first amplifier D1A, the inverting input of the first amplifier D1A respectively with one end of the 13rd resistance R13, one end of 15th resistance R15 connects, the other end of the 13rd resistance R13 is connected with the output terminal of the first amplifier D1A, the output terminal of the first amplifier D1A is connected with the first input end of AD sample circuit through the 1st resistance R1, the other end of the 15th resistance R15 respectively with one end of the 14th resistance R14, the inverting input of the second amplifier D1B connects, the other end of the 14th resistance R14 is connected with the output terminal of the second amplifier D1B, the in-phase input end of the second amplifier D1B respectively with the second output terminal of pressure transducer, one end of 4th resistance R4 connects, the other end of the 4th resistance R4 is connected with the output terminal of the second amplifier D1B, the output terminal of the second amplifier D1B is connected with the second input end of AD sample circuit through the 3rd resistance R3.
Described temperature signal collection circuit comprises some resistance, electric capacity, 5th one end of resistance R5 is connected with the output terminal of temperature sensor, the other end of the 5th resistance R5 respectively with one end of the 6th resistance R6, one end of 4th electric capacity C4 connects, the other end ground connection of the 6th resistance R6, the other end of the 4th electric capacity C4 respectively with one end of the 7th resistance R7, one end of 8th resistance R8, one end of 5th electric capacity C5 connects, 7th other end of resistance R7 is connected with the output terminals A VDD of power supply, the other end of the 8th resistance R8, the equal ground connection of the other end of the 5th electric capacity C5, the two ends of the 4th electric capacity C4 respectively with the 3rd of AD sample circuit, four-input terminal connects.
Sensor, storer, pressure signal Acquisition Circuit, temperature signal collection circuit are all arranged on digital collection plate.Microcontroller, AD sample circuit, HART bus communication circuit are all arranged on digital control plate.This digital collection plate mainly completes three functions, and the pressure differential sub-signal (N1 and COM) of first sensor is transferred to the AD end of digital control plate after amplifier (D1A and D1B is transport and placing device TLC252C) by connector (A+ and A-); It two is that the temperature signal (T) of sensor is demarcated through over-sampling and to be formed differential signal (T+ and T-) to be transferred to digital control plate AD end by connector after resistance; It three is memory functions of temperature and pressure compensation linear revise coefficient, final penalty coefficient is stored in nonvolatile memory (D2 is nonvolatile memory 25LC160).The pressure and temperature differential digital signal of pressure/differential pressure sensor is transferred to the AD end of the digital control plate of transmitter by connector.The AD sampling section of digital control plate, it be 4 groups of difference sampling channels of employing 24 ADS1241 (D4) sampling A/D chip based on, complete the digital collection of pressure signal (A+ and A-) and temperature signal (T+ and T-), then the M16CM3030RFCP microcontroller of mainboard is by the switching of spi bus control ADS1241 chip sampling channel, and reads the result of current real-time pressure and temperature data signal.The HART bus communication circuit of digital control plate, this partial circuit mainly with HART driving chip A5191HRTP (D11) for core, complete the communication between PDS transmitter mainboard and temperature and pressure compensation Systematical control main website, realize main website to sample to online temperature and pressure compensation pressure/differential pressure sensor pressure and temperature signal scaling, finally realize the process of the temperature and pressure compensation linear revise of online all the sensors.
Claims (9)
1. an intelligent pressure transmitter circuit, it is characterized in that: comprise Sensor section, microcontroller, AD sample circuit, HART bus communication circuit, pressure signal Acquisition Circuit, temperature signal collection circuit, described pressure signal Acquisition Circuit is used for the pressure signal that receiving sensor part gathers, and pass to AD sample circuit, described temperature signal collection circuit is used for the temperature signal that receiving sensor part gathers, and pass to AD sample circuit, described AD sample circuit is used for sampled pressure and temperature signal respectively, and the pressure AD sampled value obtained and temperature AD sampled value are passed to microcontroller, described HART bus communication circuit is for realizing the communication between the main website industrial computer in microcontroller and temperature and pressure compensation linear revise system, sample for realizing the pressure and temperature signal scaling of main website industrial computer to the intelligent pressure transmitter treating temperature and pressure compensation online.
2. intelligent pressure transmitter circuit according to claim 1, it is characterized in that: described pressure signal Acquisition Circuit comprises the first amplifier (D1A), second amplifier (D1B) and some resistance, the in-phase input end of described first amplifier (D1A) respectively with the first output terminal of pressure transducer, one end of 2nd resistance (R2) connects, the other end of the 2nd resistance (R2) is connected with the output terminal of the first amplifier (D1A), the inverting input of the first amplifier (D1A) respectively with one end of the 13rd resistance (R13), one end of 15th resistance (R15) connects, the other end of the 13rd resistance (R13) is connected with the output terminal of the first amplifier (D1A), the output terminal of the first amplifier (D1A) is connected with the first input end of AD sample circuit through the 1st resistance (R1), the other end of the 15th resistance (R15) respectively with one end of the 14th resistance (R14), the inverting input of the second amplifier (D1B) connects, the other end of the 14th resistance (R14) is connected with the output terminal of the second amplifier (D1B), the in-phase input end of the second amplifier (D1B) respectively with the second output terminal of pressure transducer, one end of 4th resistance (R4) connects, the other end of the 4th resistance (R4) is connected with the output terminal of the second amplifier (D1B), the output terminal of the second amplifier (D1B) is connected with the second input end of AD sample circuit through the 3rd resistance (R3).
3. intelligent pressure transmitter circuit according to claim 1, it is characterized in that: described temperature signal collection circuit comprises some resistance, electric capacity, one end of 5th resistance (R5) is connected with the output terminal of temperature sensor, the other end of the 5th resistance (R5) respectively with one end of the 6th resistance (R6), one end of 4th electric capacity (C4) connects, the other end ground connection of the 6th resistance (R6), the other end of the 4th electric capacity (C4) respectively with one end of the 7th resistance (R7), one end of 8th resistance (R8), one end of 5th electric capacity (C5) connects, the other end of the 7th resistance (R7) is connected with the output terminals A VDD of power supply, the other end of the 8th resistance (R8), the equal ground connection of the other end of the 5th electric capacity (C5), the two ends of the 4th electric capacity (C4) respectively with the 3rd of AD sample circuit, four-input terminal connects.
4. intelligent pressure transmitter circuit according to claim 1, is characterized in that: adopt spi bus to carry out communication between described microcontroller and AD sample circuit.
5. the intelligent pressure transmitter circuit according to claim 1 or 4, it is characterized in that: described AD sample circuit adopts the ADS1241 sampling A/D chip (D4) of 4 groups of difference sampling channels of 24, for completing the digital collection of pressure signal (A+ and A-) and temperature signal (T+ and T-).
6. the intelligent pressure transmitter circuit according to claim 1 or 4, is characterized in that: described microcontroller adopts model to be the microcontroller of M16CM3030RFCP.
7. intelligent pressure transmitter circuit according to claim 1, is characterized in that: also comprise storer, for storing the temperature and pressure compensation linear revise coefficient that main website industrial computer transmits.
8. intelligent pressure transmitter circuit according to claim 7, is characterized in that: described storer adopts nonvolatile memory (D2).
9. intelligent pressure transmitter circuit according to claim 1, is characterized in that: described HART bus communication circuit adopts HART driving chip (D11).
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| CN201520350230.0U CN204740082U (en) | 2015-05-27 | 2015-05-27 | Intelligence pressure transmitter circuit |
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| CN201520350230.0U CN204740082U (en) | 2015-05-27 | 2015-05-27 | Intelligence pressure transmitter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121633A (en) * | 2016-08-29 | 2016-11-16 | 北京六合伟业科技股份有限公司 | High temperature high precision water-level gauge for geothermal well monitoring system |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121633A (en) * | 2016-08-29 | 2016-11-16 | 北京六合伟业科技股份有限公司 | High temperature high precision water-level gauge for geothermal well monitoring system |
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