CN206504813U - Pressure detecting system based on gain-programmed amplifier - Google Patents
Pressure detecting system based on gain-programmed amplifier Download PDFInfo
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- CN206504813U CN206504813U CN201720145344.0U CN201720145344U CN206504813U CN 206504813 U CN206504813 U CN 206504813U CN 201720145344 U CN201720145344 U CN 201720145344U CN 206504813 U CN206504813 U CN 206504813U
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Abstract
The utility model discloses a kind of pressure detecting system based on gain-programmed amplifier, including multiple bridge pressure sensors, the signal output part of each bridge pressure sensor is connected by low pass filter with the signal input part of pressure acquisition module respectively, the signal output part of the pressure acquisition module is communicated to connect by Serial Peripheral Interface (SPI) and main control singlechip, and the main control singlechip is communicated to connect by its internal asynchronous receiving-transmitting transmitter and host computer.The utility model advantage is to use programmable gain amplifier（PGA）As the prime modulate circuit of sensor signal, different gains is used according to different demands, realizes that multichannel pressure sensor signal gathers the homogenization of gamut, so as to improve the effective accuracy of A/D conversions, reaches the undistorted processing of sensor signal；Circuit implementing scheme is simplified simultaneously, the reliability and stability of pressure data acquisition system is improved.
Description
Technical field
The utility model is related to pressure detecting system, more particularly, to the pressure detecting system based on gain-programmed amplifier
System.
Background technology
In automatic measuring and controlling system and intelligence instrument, pressure data acquisition system is past in order to ensure necessary measurement accuracy
Toward that can carry out pressure signal collection using the pressure sensor of different ranges, analog output signal level is from microvolt level to volt level；
And general A/D converter can not possibly be all matched in all cases, if using the amplifying circuit of single gain, it is past
Toward preventing the precision of A/D converter from utilizing to greatest extent, or cause measured signal to cut top saturation, cause very big measurement to miss
Difference, or even damage A/D converter.Unlikely each sensor has exclusive A/D converter, can so greatly increase and set
Count workload, it is often more important that design cost can be increased, this is not allowed to for enterprise.
At present, prime filter circuit, the amplification electricity constituted more than the collection of pressure sensor signal using specific discrete component
Road, A/D converter sample circuit are constituted.Therefore, to adapt to pressure sensor and the guarantee that different analog signal levels are exported
High accuracy is reached, then must change the input and output impedance of prime filter circuit, select suitable amplifying circuit to believe sensor
Number it is amplified, and the conditioning of sensor signal, this general is completed for different required precisions using appropriate A/D converter
Cause the increase of design efforts would, and design cost serious increase.And sensor signal conditioning is constituted by discrete component
The component that circuit needs is more, reliability reduction；Peripheral circuit is complicated, and board area is big, and scalability is low, each during manufacture
The uniformity of circuit board is poor.
The content of the invention
The utility model purpose is to provide a kind of pressure detecting system based on gain-programmed amplifier.
To achieve the above object, the utility model takes following technical proposals：
Pressure detecting system described in the utility model based on gain-programmed amplifier, including multiple bridge-type pressure sensings
Device, the signal output part of each bridge pressure sensor is defeated by low pass filter and the signal of pressure acquisition module respectively
Enter end connection, the signal output part of the pressure acquisition module is communicated to connect by Serial Peripheral Interface (SPI) and main control singlechip, institute
Main control singlechip is stated to communicate to connect by its internal asynchronous receiving-transmitting transmitter and host computer.
The pressure acquisition module is turned by multi-channel analog inputoutput multiplexer, programmable gain amplifier, 16 double channel A/D
Parallel operation, adaptive digital filter and Serial Peripheral Interface (SPI) composition；The analog signal input of the multi-channel analog inputoutput multiplexer
End is connected with the signal output part of a corresponding bridge pressure sensor respectively, the signal of multi-channel analog inputoutput multiplexer
Output end is connected with the signal input part of the programmable gain amplifier, the signal output part of programmable gain amplifier and institute
The signal input part connection of 16 double channel As/D converters is stated, the signal output parts of 16 double channel A/D converters passes through described
Adaptive digital filter is connected with the Serial Peripheral Interface (SPI).
The utility model advantage is to use programmable gain amplifier（PGA）Electricity is nursed one's health as the prime of sensor signal
Road, different gains is used according to different demands, realizes that multichannel pressure sensor signal gathers the homogenization of gamut, so that
The effective accuracy of A/D conversions is improved, the undistorted processing of sensor signal is reached；Circuit implementing scheme is simplified simultaneously, is improved
The reliability and stability of pressure data acquisition system.
Brief description of the drawings
Fig. 1 is circuit principle structure block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings, the present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
State embodiment.
As shown in Figure 1, 2, the pressure detecting system described in the utility model based on gain-programmed amplifier, including multiple bridges
Formula pressure sensor 1, the signal output part of each bridge pressure sensor 1 passes through low pass filter 2 and pressure acquisition mould respectively
The signal input part connection of block, the signal output part of pressure acquisition module passes through Serial Peripheral Interface (SPI) 3 and main control singlechip
（STM32F103RBT6）Communication connection, main control singlechip is communicated by its internal asynchronous receiving-transmitting transmitter with host computer
Connection.
Pressure acquisition module is changed by multi-channel analog inputoutput multiplexer 4, programmable gain amplifier 5,16 double channel A/D
Device 6, adaptive digital filter 7 and Serial Peripheral Interface (SPI) 3 are constituted；The input end of analog signal of multi-channel analog inputoutput multiplexer 4
Connected respectively with the signal output part of corresponding one bridge pressure sensor 1, the signal of multi-channel analog inputoutput multiplexer 4
Output end is connected with the signal input part of programmable gain amplifier 5, the signal output part of programmable gain amplifier 5 and 16
The signal input part connection of double channel A/D converters 6, the signal output part of 16 double channel A/D converters 6 is by adaptively counting
Word wave filter 7 is connected with Serial Peripheral Interface (SPI) 3.
Circuit theory design of the present utility model is summarized as follows：
Pressure sensor takes bridge pressure sensor 1 to be connected with pressure acquisition module, and connection can be very in a differential manner
Good eliminates conductor resistance and external interference signals to measuring pressure of sensor precision and the influence of the degree of accuracy, in every road pressure sensor
Input devises low pass filter, with the noise on sensor of decaying, and improves pressure measurement precision.
Programmable gain amplifier（PGA）5 maximum amplifications can be realized to faint analog signal up to 128 times
Accurate measurement；Adaptive digital filter 7 can weaken influence of the analog signal to useful signal, improve measurement accuracy, in it
Portion's reference voltage source and internal oscillator, can greatly simplify the design of circuit.
Main control singlechip and 16 double channel A/D converters 6 use Serial Peripheral Interface (SPI)（SPI）3 communication modes are led to
Letter, traffic rate is high, Serial Peripheral Interface (SPI)（SPI）Multiple pressure acquisition modules can be mounted on 3 and realize that the pressure of more multichannel is passed
Signal acquisition is felt, with very strong scalability.
Programmable gain amplifier（PGA）5 as bridge pressure sensor 1 prime modulate circuit, can be according to difference
Sensor signal carries out the gain that simple programme-control adjusts front stage circuits, and sensor signal is amplified to 16 bilaterals of rear class
Voltage required by road A/D converter 6, to reach the gamuts of a variety of different type pressure sensor signals, high accuracy, without mistake
True processing.
Detected using multichannel sensor, each channel sensor uses same amplifying circuit and A/D sample circuits all the way, so
Design cost can be greatlyd save and workload is designed and developed, make the utility model more versatility.
Claims (2)
1. a kind of pressure detecting system based on gain-programmed amplifier, it is characterised in that：Including multiple bridge pressure sensors,
The signal output part of each bridge pressure sensor is inputted by low pass filter and the signal of pressure acquisition module respectively
End connection, the signal output part of the pressure acquisition module is communicated to connect by Serial Peripheral Interface (SPI) and main control singlechip, described
Main control singlechip is communicated to connect by its internal asynchronous receiving-transmitting transmitter and host computer.
2. the pressure detecting system based on gain-programmed amplifier according to claim 1, it is characterised in that：The pressure is adopted
Collect module to be filtered by multi-channel analog inputoutput multiplexer, programmable gain amplifier, 16 double channel A/D converters, adaptive digitals
Ripple device and Serial Peripheral Interface (SPI) composition；The input end of analog signal of the multi-channel analog inputoutput multiplexer respectively with corresponding one
The signal output part connection of the bridge pressure sensor, the signal output part of multi-channel analog inputoutput multiplexer may be programmed with described
The signal input part connection of gain amplifier, the signal output part of programmable gain amplifier turns with 16 double channel A/D
The signal input part connection of parallel operation, the signal output part of 16 double channel A/D converters passes through the adaptive digital filter
It is connected with the Serial Peripheral Interface (SPI).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720145344.0U CN206504813U (en) | 2017-02-17 | 2017-02-17 | Pressure detecting system based on gain-programmed amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720145344.0U CN206504813U (en) | 2017-02-17 | 2017-02-17 | Pressure detecting system based on gain-programmed amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206504813U true CN206504813U (en) | 2017-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720145344.0U Active CN206504813U (en) | 2017-02-17 | 2017-02-17 | Pressure detecting system based on gain-programmed amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768530A (en) * | 2017-02-17 | 2017-05-31 | 安图实验仪器(郑州)有限公司 | Pressure detecting system based on gain-programmed amplifier |
| CN112284582A (en) * | 2020-10-27 | 2021-01-29 | 南京信息工程大学滨江学院 | Sensing detection signal filtering method, pressure detection system and application |
-
2017
- 2017-02-17 CN CN201720145344.0U patent/CN206504813U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768530A (en) * | 2017-02-17 | 2017-05-31 | 安图实验仪器(郑州)有限公司 | Pressure detecting system based on gain-programmed amplifier |
| CN112284582A (en) * | 2020-10-27 | 2021-01-29 | 南京信息工程大学滨江学院 | Sensing detection signal filtering method, pressure detection system and application |
| CN112284582B (en) * | 2020-10-27 | 2021-12-07 | 南京信息工程大学滨江学院 | Sensing detection signal filtering method, pressure detection system and application |
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