CN110417411A - A kind of signal condition dynamic amplifying circuit - Google Patents
A kind of signal condition dynamic amplifying circuit Download PDFInfo
- Publication number
- CN110417411A CN110417411A CN201910707137.3A CN201910707137A CN110417411A CN 110417411 A CN110417411 A CN 110417411A CN 201910707137 A CN201910707137 A CN 201910707137A CN 110417411 A CN110417411 A CN 110417411A
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- CN
- China
- Prior art keywords
- amplifying circuit
- circuit
- dynamic
- dynamic amplifying
- digit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 230000003139 buffering effect Effects 0.000 claims abstract description 7
- 230000009123 feedback regulation Effects 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000013139 quantization Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/001—Digital control of analog signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0602—Continuously compensating for, or preventing, undesired influence of physical parameters of deviations from the desired transfer characteristic
- H03M1/0604—Continuously compensating for, or preventing, undesired influence of physical parameters of deviations from the desired transfer characteristic at one point, i.e. by adjusting a single reference value, e.g. bias or gain error
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0634—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
-
- 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
- H03M1/34—Analogue value compared with reference values
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The invention discloses a kind of signal condition dynamic amplifying circuits, including buffering isolation circuit, high-pass filtering circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit and processor unit；The buffering isolation circuit, high-pass filtering circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit, processor unit input terminal are sequentially connected；The processor output end is connected with the dynamic input amplifier, the feedback regulation for the dynamic amplifying circuit gain.The present invention is when the voltage signal that sensor exports changes, amplifier gain can dynamically be adjusted, enable the voltage signal for being sent to AD always close to the reference voltage value of input, the effective conversion digit for utilizing AD, influence of the maximum lower quantization error to measurement.
Description
Technical field
The present invention relates to signal conditioning circuit more particularly to a kind of signal condition dynamic amplifying circuits.
Background technique
Sensor is various, and the parameter indexes such as range and sensitivity are different.In general, the sensing of wide range
Device sensitivity is necessarily less than normal；And highly sensitive transducer range is necessarily little.In system of condition monitoring, a certain installation
Point can not install the sensor of multiple and different ranges and sensitivity, its vibration characteristics of different installation points is not also identical；In addition,
AD quantization error can also have an impact measurement accuracy.
Because of converter limited bits, quantization error is certainly existed, i.e. the ladder-like transfer characteristic of limited resolution AD is bent
Deviation between line and the transfer characteristic curve (straight line) of unlimited resolution AD (ideal AD).
Summary of the invention
The object of the invention is that a kind of signal condition dynamic amplifying circuit is provided to solve the above-mentioned problems, including
Buffer isolation circuit, high-pass filtering circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit and processor unit；It is described
Buffer isolation circuit, high-pass filtering circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit, processor unit input terminal
It is sequentially connected；The processor output end is connected with the dynamic input amplifier, increases for the dynamic amplifying circuit
The feedback regulation of benefit.
The beneficial effects of the present invention are: the present invention, being capable of dynamic when the voltage signal that sensor exports changes
Amplifier gain is adjusted, enables the voltage signal for being sent to AD always close to the reference voltage value of input, it is effective to utilize AD's
Convert digit, influence of the maximum lower quantization error to measurement.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is the circuit diagram of dynamic amplifying circuit.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
As shown in Fig. 1, a kind of signal condition dynamic amplifying circuit of the present invention, including buffering isolation circuit, high-pass filtering
Circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit and processor unit；The buffering isolation circuit, high-pass filtering
Circuit, dynamic amplifying circuit, low-pass filter circuit, supercircuit, processor unit input terminal are sequentially connected；The processor is defeated
Outlet is connected with the dynamic input amplifier, the feedback regulation for the dynamic amplifying circuit gain.
Further, the dynamic amplifying circuit includes first resistor, digit-control resistance and operational amplifier；The dynamic is put
Big circuit input end is connected by first resistor with the operational amplifier reverse input end, digit-control resistance first end；The fortune
Amplifier out is calculated to be connected with the digit-control resistance second end；The processor unit and the digit-control resistance control signal
It is connected.
Further, the digit-control resistance is digital-to-analogue resistor network.
Further, the digital-to-analogue resistor network is analog-digital chip, if analog-digital chip digit is N, CODE is
Processor is sent to the numerical value of analog-digital chip, and Vout is dynamic amplifying circuit voltage output value, and Vin is dynamic amplifying circuit
Voltage input levels, the then relationship of output valve and input value are as follows: Vout=-Vin (2^N/CODE).
The first order is buffering isolation circuit, and subsequent conditioning circuit is avoided to impact sensor signal itself.The second level is height
Bandpass filter removes direct current and ultralow frequency ingredient in signal, retains a-c cycle ingredient relevant to vibration.The third level is dynamic
Amplifier circuit, the dynamic for carrying out different gains to signal by it are amplified, and guarantee vibration signal size not less than AD with reference to electricity
The 80% of pressure.The fourth stage is low-pass filter, removes the high-frequency noise that may be coupled in signal.Level V is an add circuit
Give Signal averaging one direct current biasing, the analog-digital converter for being sent into processor unit carries out data acquisition.
Gain adjustable amplifier is realized using high precision digital-to-analog converter.Digital analog converter is for being converted to digital quantity
The device of analog voltage or electric current, core are the resistor network being made of precision resistance and electronic switch, electronic switch
Open and-shut mode controlled by digital command.By the various combination of switch state, make resistor network that different equivalent resistance value be presented.
Digital analog converter by resistor network composition voltage divider come using, when digital analog converter inputs constant reference voltage, point
The output voltage of depressor is corresponding with resistor network equivalent resistance, also just with combined state (the namely digital command of electronic switch
Specific value) correspond, to complete the function of digital-to-analogue conversion.
After processor sends digital command to analog-digital chip, equivalent resistance is presented in analog-digital chip resistor network
Value, according to the characteristic of sign-changing amplifier, the gain of amplifier is directly proportional to feedback resistance, also with regard to and digital-to-analogue resistor network it is equivalent
Resistance value is directly proportional.
It is digital-to-analogue resistor network according to 16 analog-digital chips, if CODE is that processor is sent to digital-to-analogue conversion core
The numerical value of piece, Vout be dynamic amplifying circuit voltage output value, Vin be dynamic amplifying circuit voltage input levels, then output valve with
The relationship of input value are as follows: Vout=-Vin (65536/CODE).
In operation, after each modulus sampling, processor judges whether the voltage of signal is lower than modulus reference voltage
80% or whether exceed modulus reference voltage；If signal voltage is too low or excessively high, processor calculates amplifier gain adjustment
Amplitude, and it is sent to analog-digital chip；Gain adjustment post-processor unit carries out analog-to-digital conversion again, the number sampled with this
Value is handled.
If signal acquisition unit uses 16 converters, AD conversion reference voltage is 2.5V, is using the present invention's
Before, when the fixed gain of amplifier can only guarantee sensor full scale, be adjusted to the voltage of AD 2.2~2.4V (full scale
88%~96%).According to this gain, if sensor signal only has full scale 10%, the voltage for being adjusted to AD only has
250mV or so, the level for being only equivalent to 13 AD that 16 converters efficiently use at this time.AD quantization error is to measurement
Bring error has been more than 1% indicating value.
After applying the present invention, even if sensor signal only has the 10% of full scale, due to the adjustment of gain, can also will believe
Number being amplified to 2.2~2.4V or so gives converter, the effective digit for utilizing AD, shadow of such AD quantization error to measurement
It rings and is no more than 0.1% indicating value.
The present invention can dynamically adjust amplifier gain when the voltage signal that sensor exports changes, so that sending
Voltage signal to AD can be always close to the reference voltage value of input, and the effective conversion digit for utilizing AD subtracts to the greatest extent
Influence of the quantisation errors to measurement.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention
Technology deformation out, falls within the scope of protection of the present invention.
Claims (4)
1. a kind of signal condition dynamic amplifying circuit, which is characterized in that including buffering isolation circuit, high-pass filtering circuit, dynamic
Amplifying circuit, low-pass filter circuit, supercircuit and processor unit；The buffering isolation circuit, high-pass filtering circuit, dynamic
Amplifying circuit, low-pass filter circuit, supercircuit, processor unit input terminal are sequentially connected；The processor output end and institute
It states dynamic input amplifier to be connected, the feedback regulation for the dynamic amplifying circuit gain.
2. a kind of signal condition dynamic amplifying circuit according to claim 1, which is characterized in that the dynamic amplifying circuit packet
Include first resistor, digit-control resistance and operational amplifier；The dynamic input amplifier passes through first resistor and the operation
Amplifier inverting input, digit-control resistance first end are connected；The operational amplifier output terminal and the digit-control resistance second end
It is connected；The processor unit is connected with the digit-control resistance control signal.
3. a kind of signal condition dynamic amplifying circuit according to claim 2, which is characterized in that the digit-control resistance is digital-to-analogue
Resistor network.
4. a kind of signal condition dynamic amplifying circuit according to claim 3, which is characterized in that the digital-to-analogue resistor network is
Analog-digital chip, if analog-digital chip digit is N, CODE is the numerical value that processor is sent to analog-digital chip, Vout
For dynamic amplifying circuit voltage output value, Vin is dynamic amplifying circuit voltage input levels, then the relationship of output valve and input value
Are as follows: Vout=-Vin (2^N/CODE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910707137.3A CN110417411A (en) | 2019-08-01 | 2019-08-01 | A kind of signal condition dynamic amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910707137.3A CN110417411A (en) | 2019-08-01 | 2019-08-01 | A kind of signal condition dynamic amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110417411A true CN110417411A (en) | 2019-11-05 |
Family
ID=68365173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910707137.3A Pending CN110417411A (en) | 2019-08-01 | 2019-08-01 | A kind of signal condition dynamic amplifying circuit |
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| Country | Link |
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| CN (1) | CN110417411A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024216A (en) * | 2019-12-24 | 2020-04-17 | 北京金迈捷科技有限公司 | Online range adjusting system and method |
| CN111130475A (en) * | 2019-12-31 | 2020-05-08 | 江苏润石科技有限公司 | Gain error configurable instrumentation amplifier and configuration method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201672968U (en) * | 2010-05-14 | 2010-12-15 | 成都赛腾自动化工程有限公司 | Adaptive signal adjusting device for vibrating sensor |
| CN103616564A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Self-adaptation signal conditioning device |
-
2019
- 2019-08-01 CN CN201910707137.3A patent/CN110417411A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201672968U (en) * | 2010-05-14 | 2010-12-15 | 成都赛腾自动化工程有限公司 | Adaptive signal adjusting device for vibrating sensor |
| CN103616564A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Self-adaptation signal conditioning device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024216A (en) * | 2019-12-24 | 2020-04-17 | 北京金迈捷科技有限公司 | Online range adjusting system and method |
| CN111024216B (en) * | 2019-12-24 | 2021-09-21 | 北京金迈捷科技有限公司 | Online range adjusting system and method |
| CN111130475A (en) * | 2019-12-31 | 2020-05-08 | 江苏润石科技有限公司 | Gain error configurable instrumentation amplifier and configuration method thereof |
| CN111130475B (en) * | 2019-12-31 | 2024-05-10 | 江苏润石科技有限公司 | Gain error configurable instrumentation amplifier and configuration method thereof |
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| CB02 | Change of applicant information |
Address after: Huaneng building, No.47, section 4, Renmin South Road, Wuhou District, Chengdu, Sichuan 610000 Applicant after: Huaneng Sichuan Energy Development Co.,Ltd. Applicant after: BEIJING ORIENTGE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Address before: Huaneng building, No.47, section 4, Renmin South Road, Wuhou District, Chengdu, Sichuan 610000 Applicant before: Huaneng Sichuan Hydropower Co.,Ltd. Applicant before: BEIJING ORIENTGE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191105 |
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| RJ01 | Rejection of invention patent application after publication |