CN109656296A - A kind of small multi-channel sensor signal preprocessing module - Google Patents
A kind of small multi-channel sensor signal preprocessing module Download PDFInfo
- Publication number
- CN109656296A CN109656296A CN201811552479.4A CN201811552479A CN109656296A CN 109656296 A CN109656296 A CN 109656296A CN 201811552479 A CN201811552479 A CN 201811552479A CN 109656296 A CN109656296 A CN 109656296A
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- China
- Prior art keywords
- circuit
- signal
- preprocessing module
- small multi
- sensor signal
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The present invention relates to a kind of small multi-channel sensor signal preprocessing modules, signal pre-processing module uses modular circuit form, with independent encapsulating structure, integrated level is higher, compact, suitable for different hardware platforms, different structure form Embedded data acquisition system, there is great application flexibility；Signal pre-processing module have unified electric interfaces, when the sensor type of data collection system, quantity change when, only need to change signal pre-processing module (, without being redesigned to printed board；Signal pre-processing module realize sensor between A/D conversion circuit signal processing circuit it is highly integrated, for multiple types sensor provide power supply excitation and signal processing, reduce the complexity of Hardware Design of Data Acquisition System；Signal pre-processing module optimization, the principle for having cured dissimilar sensor signal processing circuit and pcb map design, effectively reduce the noise of signal link, improve the overall accuracy of data collection system.
Description
Technical field
The present invention relates to Embedded data acquisition system application field, specifically a kind of small multi-channel sensor signal is pre-
Processing module.
Background technique
In the test of some small aircrafts, need using Embedded data acquisition system to vehicle launch, flight
The environment parameters parameter such as vibration, impact, overload, pressure of process is acquired, and is needed more using vibration, impact, overload, pressure etc.
The sensor of seed type completes the conversion of the physical signals such as acceleration, pressure to electric signal, the electric signal after conversion is filtered,
A/D converter, which is sent into, after range-adjusting, zero-bit adjustment and impedance transformation is converted to digital quantity.
The function of signal pre-processing circuit is exactly to complete sensor power supply, the filtering of output signal, range-adjusting, zero-bit tune
Whole and impedance transformation.Generally there are two types of implementations for moment sensor signal pre-processing circuit, a kind of to adjust for general signal is suitable
Instrument, but the suitable tune instrument of existing signal has the following deficiencies: first, because volume is excessive, causes to apply in embedded data acquisition
In system；Second, the suitable interface for adjusting instrument of signal is general-purpose interface, and Embedded data acquisition system is according to the actual situation to interface
It is changed, so that the suitable general-purpose interface for adjusting instrument of signal can not be connect with Embedded data acquisition system interface；Third, signal are suitable
Adjusting the mounting means of instrument causes it that can not be mounted in Embedded data acquisition system.Another implementation is direct print
Making sheet circuit design, with A/D circuit, microcontroller circuit etc. in same printed board placement-and-routing.This kind of design method exists
Many defects: 1) when sensor type, quantity change, corresponding pretreatment circuit needs are made adjustment, and lead to printed board again
It is designed；2) different sensors have different power supply modes, need the corresponding a variety of output specifications of design in printed board
Power circuit increases the complexity of printed board design；3) analog circuit, digital circuit are designed with plate, and digital signal can be to mould
Quasi- signal interferes, and improves analog signal noise, reduces the sampling precision of system.
Summary of the invention
To solve the problems, such as that current signal pre-processing circuit design method exists, the invention proposes a kind of small multi-channels
Sensor signal preprocessing module.
The technical scheme is that a kind of small multi-channel sensor signal preprocessing module, include printed board (2) if,
Main pipe foot (3) and protective shell (1)；Several pin (3) one end and printed board (2) are connected, the other end and other external printed board phases
Connection；Protective shell (1) is for avoiding printed board (2) contaminated damage.
The protective shell (1) is cavity shell closed at one end open at one end, and printed board (2) is placed in cavity, and with guarantor
Protective case (1) closed end is connected.
Printed board (2) is placed in cavity, and there are distances with protective shell (1) open end；By epoxide-resin glue to protective shell
(1) inner cavity is potted, and protective shell (1) inner cavity is filled up.
Several through-holes are provided on the printed board (2) on corresponding two sides, several pin (3) one end are located at the through-hole
In, the quantity of pin (3) is not less than 10.
The pin (3) is made of gold-plated tin-phosphor bronze material.
Including several antistatic TVS pipes, in each channel input/output port antistatic TVS pipe in parallel.
It include low-pass filter circuit, level shifting circuit, blocking amplifying circuit, constant-current source circuit and essence in the printed board
Close voltage regulator circuit；The voltage signal of external voltage output type sensor conditioning circuit output reaches low-pass filter circuit, through low pass
Filter circuit filters out after the high fdrequency component of signal output to level shifting circuit；Amplitude and zero-bit of the level shifting circuit to signal
It is exported after being adjusted；Exterior I EPE Conditioning Circuits of Sensor, constant-current source circuit provide constant current drive to IEPE sensor, IEPE
Sensor output voltage signal is to blocking amplifying circuit, and output is low-pass filtered to low-pass filter circuit after isolated DC component
The high fdrequency component that circuit filters out signal is exported to level shifting circuit, and level shifting circuit adjusts the amplitude and zero-bit of signal
Output after whole.
LT3092 type High Precision Constant Current Source chip is used in the constant-current source circuit, constant-current source circuit is separately positioned at substrate
Single-point grounding between one end and signal processing circuit.
The low-pass filter circuit is realized using butterworth filter.
Signal pre-processing module proposed by the present invention can provide working power or constant current to multichannel multiple types sensor
It motivates and the pretreatment such as blocking amplification, low-pass filtering, level conversion is carried out to sensor output signal, final generate meets A/D
The signal of conversion circuit input requirements.Signal pre-processing module can carry out IEPE type sensor, voltage output type sensor
Signal Pretreatment.Signal pre-processing module uses pcb board, surface mount reflow soldering process, and dual-in-line pin is drawn, aluminium alloy
Shell encapsulating manufacture, module size are not more than 40mm × 40mm × 10mm, and number of channels is not less than 10 channels.
Signal pre-processing module beneficial effect proposed by the present invention is: signal pre-processing module uses modular circuit form,
With independent encapsulating structure, integrated level is higher, compact, is suitable for different hardware platforms, and different structure form is embedded
Data collection system has great application flexibility；Signal pre-processing module has unified electric interfaces, when data acquire
When the sensor type of system, quantity change, only need to change signal pre-processing module (, without being redesigned to printed board；
Signal pre-processing module realize sensor between A/D conversion circuit signal processing circuit it is highly integrated, be multiple types
Sensor provides power supply excitation and signal processing, reduces the complexity of Hardware Design of Data Acquisition System；Signal Pretreatment mould
Block optimization, the principle for having cured dissimilar sensor signal processing circuit and pcb map design, effectively reduce signal chains
The noise on road improves the overall accuracy of data collection system.
Detailed description of the invention
Fig. 1: signal pre-processing module structural schematic diagram.
Fig. 2: signal pre-processing module schematic block circuit diagram.
Specific embodiment
The present invention will be described combined with specific embodiments below, and the invention includes, but is not limited to, the following examples.
Referring to Fig.1, the signal pre-processing module includes Al-alloy casing (1), printed board (2), gold-plated tin-phosphor bronze pipe
Foot (3), fastening screw (4).Gold-plated tin-phosphor bronze pin (3) is welded in printed board (2), and printed board (2) passes through fastening screw
(4) it is installed on Al-alloy casing (1).Assembly is completed, and epoxy resin encapsulated Al-alloy casing (1) inner cavity is used.The signal
The outer dimension of preprocessing module is not more than 40mm × 40mm × 10mm.The signal pre-processing module printed board (2) 4 installations
Hole is all grounded, and is connected by screw with shell.
Referring to Fig. 2, the signal pre-processing module includes 10 road sensor signal conditioning circuits, wherein 4 tunnels are that voltage is defeated
Type sensor signal conditioning circuit out, 6 tunnels are IEPE type sensor signal conditioning circuit.The voltage output type sensor signal
Conditioning circuit is made of low-pass filter circuit, level shifting circuit；The IEPE type sensor signal conditioning circuit is by constant-current source
Circuit, blocking amplifying circuit, low-pass filter circuit, level shifting circuit composition.Each channel circuit is mutually indepedent, can be right simultaneously
10 tunnel sensor signals are pre-processed.The signal pre-processing module further includes accurate voltage-stabilizing circuit, is constant-current source circuit, electricity
Flat conversion circuit provides accurate reference voltage.
Referring to Fig. 2, the voltage output type Conditioning Circuits of Sensor, sensor output voltage signal to low-pass filtering electricity
Road, the high fdrequency component that low-pass filtered circuit filters out signal are exported to level shifting circuit, width of the level shifting circuit to signal
Value and zero-bit export after being adjusted.The IEPE Conditioning Circuits of Sensor, constant-current source circuit provide constant current drive to IEPE biography
Sensor, IEPE sensor output voltage signal to blocking amplifying circuit, output is to low-pass filter circuit, warp after isolated DC component
The high fdrequency component that low-pass filter circuit filters out signal is exported to level shifting circuit, and level shifting circuit is to the amplitude of signal and zero
Position exports after being adjusted.
The signal pre-processing module, in order to prevent influence of the constant-current source circuit to signal processing circuit, constant-current source circuit
It is separately positioned at single-point grounding between substrate one end and signal processing circuit.
The signal pre-processing module filter circuit uses butterworth filter, solves output sinusoidal signal distortion
Problem.
It is high-precision to use LT3092 type in order to improve constant-current source output drive current precision for the signal pre-processing module
Close constant current source chip.
The signal pre-processing module increases at power pin to eliminate static discharge (ESD) to the destruction of circuit
High frequency decoupling capacitor and antistatic TVS pipe；In each channel input/output port antistatic TVS in parallel.
Claims (9)
1. a kind of small multi-channel sensor signal preprocessing module, which is characterized in that including printed board (2), several pins (3)
With protective shell (1)；Several pin (3) one end and printed board (2) are connected, and the other end is connected with other external printed boards；Protection
Shell (1) is for avoiding printed board (2) contaminated damage.
2. a kind of small multi-channel sensor signal preprocessing module as described in claim 1, which is characterized in that the protection
Shell (1) is cavity shell closed at one end open at one end, and printed board (2) is placed in cavity, and solid with protective shell (1) closed end
Even.
3. a kind of small multi-channel sensor signal preprocessing module as claimed in claim 2, which is characterized in that printed board
(2) it is placed in cavity, there are distances with protective shell (1) open end；Protective shell (1) inner cavity is filled by epoxide-resin glue
Envelope, and protective shell (1) inner cavity is filled up.
4. a kind of small multi-channel sensor signal preprocessing module as described in claim 1, which is characterized in that the printing
Several through-holes are provided on plate (2) on corresponding two sides, several pin (3) one end are located in the through-hole, the quantity of pin (3)
Not less than 10.
5. a kind of small multi-channel sensor signal preprocessing module as described in claim 1, which is characterized in that the pin
(3) it is made of gold-plated tin-phosphor bronze material.
6. a kind of small multi-channel sensor signal preprocessing module as claimed in claim 1 or 5, which is characterized in that also wrap
Several antistatic TVS pipes are included, in each channel input/output port antistatic TVS pipe in parallel.
7. a kind of small multi-channel sensor signal preprocessing module as described in claim 1, which is characterized in that the printing
It include low-pass filter circuit, level shifting circuit, blocking amplifying circuit, constant-current source circuit and accurate voltage-stabilizing circuit on plate；It is external
The voltage signal of voltage output type Conditioning Circuits of Sensor output reaches low-pass filter circuit, and low-pass filtered circuit filters out signal
High fdrequency component after output to level shifting circuit；Level shifting circuit exports after being adjusted to the amplitude and zero-bit of signal；
Exterior I EPE Conditioning Circuits of Sensor, constant-current source circuit provide constant current drive to IEPE sensor, IEPE sensor output voltage
Signal is to blocking amplifying circuit, and to low-pass filter circuit, low-pass filtered circuit filters out signal for output after isolated DC component
High fdrequency component is exported to level shifting circuit, and level shifting circuit exports after being adjusted to the amplitude and zero-bit of signal.
8. a kind of small multi-channel sensor signal preprocessing module as claimed in claim 7, which is characterized in that the constant current
LT3092 type High Precision Constant Current Source chip is used in source circuit, constant-current source circuit is separately positioned at substrate one end and signal processing
Single-point grounding between circuit.
9. a kind of small multi-channel sensor signal preprocessing module as claimed in claim 7, which is characterized in that the low pass
Filter circuit is realized using butterworth filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552479.4A CN109656296A (en) | 2018-12-18 | 2018-12-18 | A kind of small multi-channel sensor signal preprocessing module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552479.4A CN109656296A (en) | 2018-12-18 | 2018-12-18 | A kind of small multi-channel sensor signal preprocessing module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109656296A true CN109656296A (en) | 2019-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811552479.4A Pending CN109656296A (en) | 2018-12-18 | 2018-12-18 | A kind of small multi-channel sensor signal preprocessing module |
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Citations (6)
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|---|---|---|---|---|
| CN1381161A (en) * | 2000-05-11 | 2002-11-20 | 罗伯特·博施有限公司 | Electronic device |
| CN201297972Y (en) * | 2008-11-24 | 2009-08-26 | 河南理工大学 | Pressure sensor |
| US20090234608A1 (en) * | 2008-03-14 | 2009-09-17 | Oki Semiconductor Co., Ltd. | Sensor module and method for correcting sense output signal therefrom |
| CN104316723A (en) * | 2014-10-21 | 2015-01-28 | 暨南大学 | Universal high-precision signal conditioning device for IEPE type acceleration sensor |
| CN206756755U (en) * | 2017-03-01 | 2017-12-15 | 桂林电子科技大学 | A kind of stress wave signal conditioning device |
| CN207528256U (en) * | 2017-12-04 | 2018-06-22 | 中国电子科技集团公司第四十八研究所 | A kind of separate type integrated sensor |
-
2018
- 2018-12-18 CN CN201811552479.4A patent/CN109656296A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1381161A (en) * | 2000-05-11 | 2002-11-20 | 罗伯特·博施有限公司 | Electronic device |
| US20090234608A1 (en) * | 2008-03-14 | 2009-09-17 | Oki Semiconductor Co., Ltd. | Sensor module and method for correcting sense output signal therefrom |
| CN201297972Y (en) * | 2008-11-24 | 2009-08-26 | 河南理工大学 | Pressure sensor |
| CN104316723A (en) * | 2014-10-21 | 2015-01-28 | 暨南大学 | Universal high-precision signal conditioning device for IEPE type acceleration sensor |
| CN206756755U (en) * | 2017-03-01 | 2017-12-15 | 桂林电子科技大学 | A kind of stress wave signal conditioning device |
| CN207528256U (en) * | 2017-12-04 | 2018-06-22 | 中国电子科技集团公司第四十八研究所 | A kind of separate type integrated sensor |
Non-Patent Citations (1)
| Title |
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| 刘妍妍等: "《电子电路设计与实践》", 31 July 2015 * |
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Application publication date: 20190419 |