CN207096764U - Pressure acquisition module - Google Patents
Pressure acquisition module Download PDFInfo
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- CN207096764U CN207096764U CN201721081457.5U CN201721081457U CN207096764U CN 207096764 U CN207096764 U CN 207096764U CN 201721081457 U CN201721081457 U CN 201721081457U CN 207096764 U CN207096764 U CN 207096764U
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Abstract
The utility model provides a kind of pressure acquisition module, and it includes a reference source, diffusion silicon pressure sensor, differential amplifier circuit, AD sample circuits, microprocessor, power supply, magnetic coupling isolation circuit, RS485 level shifting circuits and RS485 buses；A reference source output connects with diffusion silicon pressure sensor input, the input of AD sample circuits one respectively；Diffusion silicon pressure sensor exports to be connected with differential amplifier circuit input；Differential amplifier circuit exports to be connected with another input of AD sample circuits；AD sample circuits export to be connected with the input of microprocessor first；The input of microprocessor second is connected with power supply；Microprocessor is connected by serial ports and the input of magnetic coupling isolation circuit；Magnetic coupling isolation circuit exports to be connected with the input of RS485 level shifting circuits；RS485 level shifting circuits pass through the RS485 buses；With upper machine communication.The utility model is transmitted using the RS485 buses of isolated form, improves the degree of accuracy and the reliability of system.
Description
Technical field
It the utility model is related to a kind of pressure acquisition module.
Background technology
In existing pressure acquisition system, mainly there is two ways, one kind is that in-site collecting pressure signal is converted into 4-
20mA pick-ups are exported to secondary meter, and a kind of is that the direct line access secondary meter for extending sensor is acquired, but this and two
All there is intrinsic limitation in kind mode, be exactly not easy to networking and centralized displaying control, while the transmission of pure analog quantity is anti-dry
It is weaker to disturb ability, influences acquisition precision, with the progress of industrial development, requirement of the client to pressure acquisition system is increasingly
Height, while increasing with equipment, the drawbacks of electromagnetic interference is serious all the more, and both modes are present, progressively show, for solution
The certainly demand of client.
The content of the invention
The purpose of this utility model is to provide a kind of new pressure acquisition module, and height is being carried out to pressure sensor signal
After the sampling processing of precision, it is transmitted using the RS485 buses of isolated form, improves the degree of accuracy and the reliability of system.
The utility model uses following technical scheme：A kind of pressure acquisition module, it is characterised in that：Including a reference source, expand
Silicon pressure sensor, differential amplifier circuit, AD sample circuits, microprocessor, power supply, magnetic coupling isolation circuit, RS485 level is dissipated to turn
Change circuit and RS485 buses；The a reference source output connects with diffusion silicon pressure sensor input, the input of AD sample circuits one respectively
Connect；Diffusion silicon pressure sensor exports to be connected with differential amplifier circuit input；Differential amplifier circuit output is another with AD sample circuits
One input connection；AD sample circuits export to be connected with the input of microprocessor first；The input of microprocessor second is connected with power supply；It is micro-
Processor is connected by serial ports and the input of magnetic coupling isolation circuit；Magnetic coupling isolation circuit exports to be inputted with RS485 level shifting circuits
Connection；RS485 level shifting circuits and RS485 buses；RS485 buses and upper machine communication.
In the embodiment of the utility model one, in addition to a filter circuit；The filter circuit is arranged at diffused-silicon pressure
Between sensor and differential amplifier circuit.
Further, the filter circuit is RC filter circuits.
In the embodiment of the utility model one, in addition to an over-voltage over-current protection circuit；The over-voltage over-current protection circuit
Set between RS485 level shifting circuits and RS485 buses.
In the embodiment of the utility model one, the microprocessor is Cortex-M0 core A RM processors.
In the embodiment of the utility model one, the power supply is DC-DC insulating power supplies.
Compared with prior art, the utility model has advantages below：
1st, using Cortex-M0 core A RM processors as master controller, peripheral functionality is abundant, disposal ability is strong, low in energy consumption.
2nd, high-precision amplification circuit, it is reliable and stable with reference to filter circuit, sampling.
3rd, low power dissipation design, caloric value is small, and reducing temperature influences, and improves measurement accuracy.
4th, designed using isolated form RS485 communication interfaces, strong antijamming capability, and add over-current over-voltage protection function, fitted
Close various application occasions.
5th, the Modbus RTU communication protocols of industrial standard are met, compatibility is strong, is adapted to a variety of host computers.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model.
Embodiment
Explanation is further explained to the utility model with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1, the utility model provides a kind of pressure acquisition module, it include a reference source, diffusion silicon pressure sensor,
Differential amplifier circuit, AD sample circuits, microprocessor, power supply, magnetic coupling isolation circuit, RS485 level shifting circuits and RS485 are total
Line；The a reference source output connects with diffusion silicon pressure sensor input, the input of AD sample circuits one respectively；Diffused-silicon pressure passes
Sensor exports to be connected with differential amplifier circuit input；Differential amplifier circuit exports to be connected with another input of AD sample circuits；AD is adopted
Sample circuit output connects with the input of microprocessor first；The input of microprocessor second is connected with power supply；Microprocessor passes through serial ports
Input and connect with magnetic coupling isolation circuit；Magnetic coupling isolation circuit exports to be connected with the input of RS485 level shifting circuits；RS485 level
Change-over circuit and RS485 buses；RS485 buses and upper machine communication.Designed using isolated form RS485 communication interfaces, it is anti-interference
Ability is strong, and adds over-current over-voltage protection function, is adapted to various application occasions.A reference source selects high precision reference source, and difference is put
Big circuit selects low-power consumption differential amplifier circuit.High-precision amplification circuit, it is reliable and stable with reference to advanced filter circuit, sampling.
Low power dissipation design, caloric value is small, and reducing temperature influences, and improves measurement accuracy.
In the embodiment of the utility model one, in addition to a filter circuit；The filter circuit is arranged at diffused-silicon pressure
Between sensor and differential amplifier circuit.
Further, the filter circuit is RC filter circuits.
In the embodiment of the utility model one, in addition to an over-voltage over-current protection circuit；The over-voltage over-current protection circuit
Set between RS485 level shifting circuits and RS485 buses.
In the embodiment of the utility model one, the microprocessor is Cortex-M0 core A RM processors.Using
Cortex-M0 core A RM processors are as master controller, and peripheral functionality is abundant, disposal ability is strong, low in energy consumption.
In the embodiment of the utility model one, the power supply is DC-DC insulating power supplies.
Above is preferred embodiment of the present utility model, all changes made according to technical solutions of the utility model are produced
Function without departing from technical solutions of the utility model scope when, belong to the scope of protection of the utility model.
Claims (6)
- A kind of 1. pressure acquisition module, it is characterised in that：Including a reference source, diffusion silicon pressure sensor, differential amplifier circuit, AD Sample circuit, microprocessor, power supply, magnetic coupling isolation circuit, RS485 level shifting circuits and RS485 buses；The a reference source is defeated Go out and connected respectively with diffusion silicon pressure sensor input, the input of AD sample circuits one；Diffusion silicon pressure sensor exports and difference Amplifying circuit input connection；Differential amplifier circuit exports to be connected with another input of AD sample circuits；AD sample circuits export with it is micro- The input connection of processor first；The input of microprocessor second is connected with power supply；Microprocessor passes through serial ports and magnetic coupling isolation circuit Input connection；Magnetic coupling isolation circuit exports to be connected with the input of RS485 level shifting circuits；RS485 level shifting circuits and RS485 Bus；RS485 buses and upper machine communication.
- 2. pressure acquisition module according to claim 1, it is characterised in that：Also include a filter circuit；The filtered electrical Road is arranged between diffusion silicon pressure sensor and differential amplifier circuit.
- 3. pressure acquisition module according to claim 2, it is characterised in that：The filter circuit is RC filter circuits.
- 4. pressure acquisition module according to claim 1, it is characterised in that：Also include an over-voltage over-current protection circuit；Institute Over-voltage over-current protection circuit is stated to set between RS485 level shifting circuits and RS485 buses.
- 5. pressure acquisition module according to claim 1, it is characterised in that：The microprocessor is Cortex-M0 kernels Arm processor.
- 6. pressure acquisition module according to claim 1, it is characterised in that：The power supply is DC-DC insulating power supplies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721081457.5U CN207096764U (en) | 2017-08-28 | 2017-08-28 | Pressure acquisition module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721081457.5U CN207096764U (en) | 2017-08-28 | 2017-08-28 | Pressure acquisition module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096764U true CN207096764U (en) | 2018-03-13 |
Family
ID=61540137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721081457.5U Active CN207096764U (en) | 2017-08-28 | 2017-08-28 | Pressure acquisition module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096764U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112087226A (en) * | 2020-09-30 | 2020-12-15 | 无锡市海鹰加科海洋技术有限责任公司 | Circuit for isolating depth finder from external equipment |
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
-
2017
- 2017-08-28 CN CN201721081457.5U patent/CN207096764U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112087226A (en) * | 2020-09-30 | 2020-12-15 | 无锡市海鹰加科海洋技术有限责任公司 | Circuit for isolating depth finder from external equipment |
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
| CN114354021B (en) * | 2021-12-27 | 2024-05-24 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
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