CN203911877U - Signal automatic gain circuit of multichannel gas ultrasonic flowmeter - Google Patents
Signal automatic gain circuit of multichannel gas ultrasonic flowmeter Download PDFInfo
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- CN203911877U CN203911877U CN201420239784.9U CN201420239784U CN203911877U CN 203911877 U CN203911877 U CN 203911877U CN 201420239784 U CN201420239784 U CN 201420239784U CN 203911877 U CN203911877 U CN 203911877U
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Abstract
Provided is a signal automatic gain circuit of a multichannel gas ultrasonic flowmeter. The output end of a high-precision operational amplifier is connected with the input end of a high-gain adjustable broadband voltage controlled amplifier. The output end of the high-gain adjustable broadband voltage controlled amplifier is connected with the input end of a peak sampling hold circuit. The output end of the peak sampling hold circuit is connected with the input end of a high-speed analog/digital (A/D) converter 4. The output end of the high-speed A/D converter is connected with the input end of a MCU gain circuit control module. The output end of the gain circuit control module is connected with the input end of a high-speed analog/digital (D/A) converter. The output end of the high-speed D/A converter is connected with a voltage regulator circuit. The output end of the voltage regulator circuit is connected with the input end of the high-gain adjustable broadband voltage controlled amplifier. The output end of the high-gain adjustable broadband voltage controlled amplifier is connected with the input end of an impedance matching output circuit. The signal automatic gain circuit can automatically adjust and process received signals under influence of external environment.
Description
Technical field
The utility model relates to a kind of signal automatic gain circuit, the self-adapting signal Circuit tuning of gas ultrasonic flowmeter that especially can be under the impact of various external environments.
Background technology
The signal deteching circuit of existing ultrasonic flowmeter, when processing the signal of telecommunication faint after long line transmission, need to carry out suitable compensation and correction.Currently used method, has amplifying circuit, the selection of manual gain multiple, the manual adjustments of mechanical potentiometer etc. of fixed gain.When said method all cannot meet the maintenance of sonac and change, the signal difference that the self-characteristic of transducer brings and the deviation of measurement; Cannot actually reflect the fluctuation of measuring channel pressure, the transducer that the variation of gas flow rate causes receives beating of signal, make flowmeter internal circuit for this situation, not make the online adjustment of corresponding signal amplitude; The digital quantization that makes internal circuit cannot realize signal automatic gain is processed; Cannot meet intelligentized diagnosis and the processing in the signal amplitude control range arranging, carried out before dispatching from the factory; Cannot reach the intrinsic signal amplitude of transducer self-characteristic and sensitivity, cause ultrasonic flowmeter to be difficult to meet the requirement of the accuracy of measurement of metering system.
Summary of the invention
The utility model provides a kind of signal automatic gain circuit of multi-channel gas ultrasonic flowmeter.
A signal automatic gain circuit for multi-channel gas ultrasonic flowmeter, is characterized in that, high precision operating amplifier output connects the adjustable broadband of high-gain voltage-controlled amplifier input; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects peak sampling hold circuit input; The output of peak sampling hold circuit connects the input of high speed analog-digital conversion A/D converter; The output of high speed analog-digital conversion A/D converter connects the input of MCU gain circuitry control module; The output of gain circuitry control module connects high speed analog-digital conversion D/A converter 6 inputs; The output of high speed analog-digital conversion D/A converter connects voltage-regulating circuit; The output of voltage-regulating circuit connects the adjustable broadband of high-gain voltage-controlled amplifier input; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects the input of impedance matching output circuit.
Operation principle of the present utility model is, the signal of the preposition reception of ultrasonic wave is input to the input of high precision operating amplifier, by high precision operating amplifier, carrying out the semi-automatic self adaptation initial adjustment of signal amplifies, high precision operating amplifier output is by the signal after semi-automatic self adaptation initial adjustment amplification subsequently, be connected to the adjustable broadband of high-gain voltage-controlled amplifier and carry out the processing of AGC signal, signal after processing carries out signals collecting conversion through peak sampling hold circuit and high speed analog-digital conversion A/D converter successively, digital signal after conversion is carried MCU gain circuitry control module, A/D sampled data is calculated through the AGC adaptive algorithm relation of MCU gain circuitry control module like this, calculate data relationship corresponding to amplifier gain needing, the automatic gain value calculating is converted to the data that meet D/A output, pass to high speed analog-digital conversion D/A converter and carry out the voltage that digital-to-analogue conversion becomes phase signals to control from gain-adjusted, through voltage-regulating circuit output, make it can meet the voltage signal of the AGC of the adjustable broadband of high-gain voltage-controlled amplifier processing, the output pin output voltage values of the adjustable broadband of high-gain voltage-controlled amplifier
(with Vc, represent
),mCU gain circuitry control module applies different voltage to the output pin of the adjustable broadband of high-gain voltage-controlled amplifier and carrys out the big or small of ride gain, and its functional relation of controlling magnitude of voltage Vc and gain G is as follows, that is, and and adaptive algorithm:
g
(v/v)
=10
-2Vc+1
formula 1; G
(dB)
=-40
vc+1
dB ... formula 2.
By impedance matching output circuit, making to realize circuit by the feedback control technology of the adjustable broadband of high-gain voltage-controlled amplifier controls automatically, be configured to follow the signal of the extraneous self adaptation state changing, can reach again the control action of the feedback control system of signal automatic gain.
Signal automatic gain control circuit is a feedback control system, MCU gain circuitry control module can constantly be amplified the signal of ultrasonic reception by auto-gain circuit and dwindle, make within the signal of ultrasonic reception reaches signal amplitude control range, to meet the requirement of systematic survey accuracy.
The utility model has mainly solved the defect existing in the input processing procedure of existing ultrasonic flowmeter, can actually reflect the fluctuation of measuring channel pressure, the transducer that the variation of gas flow rate causes receives beating of signal, make flowmeter internal circuit for this situation, to make the online adjustment of corresponding signal amplitude; The digital quantization that makes internal circuit can realize signal automatic gain is processed; Intelligentized diagnosis and the processing in the signal amplitude control range arranging, carried out have been met before dispatching from the factory; And can reach the intrinsic signal amplitude of transducer self-characteristic and sensitivity, make ultrasonic flowmeter can meet the accuracy of measurement requirement of metering system.
The beneficial effects of the utility model are, the no matter increase of the signal of the preposition reception of ultrasonic wave or reduce, output signal level only changes in less scope, thereby it is basicly stable to remain in the situation that input signal changes output signal, reach the object that automatic gaining controling signal regulates automatically, effectively improve the signal adaptation scope of ultrasonic flowmeter, realize the adaptive control of signal real-time change.Meet the requirement of systematic survey accuracy.
Accompanying drawing explanation
Fig. 1 is the utility model ultrasonic signal auto-gain circuit schematic diagram.
The operational amplifier of 1 high-precision high-speed,
The 2 adjustable broadband of high-gain voltage-controlled amplifiers,
3 peak sampling hold circuits,
4 high speed analog-digital conversion A/D converters,
5MCU gain circuitry control module,
The modulus D/A converter of 6 high speeds,
7 voltage-regulating circuits,
8 impedance matching output circuits.
Embodiment
By reference to the accompanying drawings the utility model is further described.
A signal automatic gain circuit for multi-channel gas ultrasonic flowmeter, high precision operating amplifier 1 output connects the adjustable broadband of high-gain voltage-controlled amplifier 2 inputs; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects peak sampling hold circuit 3 inputs; The output of peak sampling hold circuit connects the input of high speed analog-digital conversion A/D converter 4; The output of high speed analog-digital conversion A/D converter connects the input of MCU gain circuitry control module 5; The output of gain circuitry control module connects the input of high speed analog-digital conversion D/A converter 6; The output of high speed analog-digital conversion D/A converter connects voltage-regulating circuit 7; The output of voltage-regulating circuit connects the adjustable broadband of high-gain voltage-controlled amplifier 2 inputs; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects the input of impedance matching output circuit 8.
Characteristics different when the length because of each sound channel mechanically, transducer there are differences each measurement that the variation of the fluctuation variation different with measurement, pressure, gas flow rate causes, when the signal magnitude that transducer receives exceeds signal amplitude control range, the signal of the preposition reception of ultrasonic wave is input to high precision operating amplifier 1 and carries out the semi-automatic self adaptation initial adjustment amplification of signal, then high precision operating amplifier 1 output, by the signal after semi-automatic self adaptation initial adjustment amplification, is connected to the adjustable broadband of high-gain voltage-controlled amplifier 2 and carries out signal automatic gain processing.
The output of the adjustable broadband of high-gain voltage-controlled amplifier 2 is connected with peak sampling hold circuit 3, self feed back control signal is carried out to signals collecting conversion digital signal by modulus a/d transducer 4 at a high speed and flow to MCU gain circuitry control module 5; The input of the adjustable broadband of high-gain voltage-controlled amplifier 2 is connecting data relationship corresponding to amplifier gain that last time, AGC adaptive algorithm calculated needs and is carrying out signal from gain-adjusted voltage control in addition, the signal of exporting by voltage-regulating circuit 7, makes it can meet the voltage signal of the AGC of the adjustable broadband of high-gain voltage-controlled amplifier 2 processing.
MCU gain circuitry control module 5 will receive signals collecting conversion digital signal, compare with signal amplitude control range, according to above-mentioned AGC adaptive algorithm, (be formula 1, 2) process, calculate data relationship corresponding to amplifier gain needing, the automatic gain value calculating is converted to the data that meet D/A output, pass to the modulus D/A converter 6 of the high speed being connected with MCU gain circuitry control module 5, control voltage-regulating circuit 7 outputs, by the voltage signal that meets AGC adaptive algorithm relation of output, again feed back to the adjustable broadband of high-gain voltage-controlled amplifier 2, make it can produce the voltage signal of the AGC that meets 2 processing of the adjustable broadband of high-gain voltage-controlled amplifier, make within the signal of ultrasonic reception reaches signal amplitude control range, again by 8 outputs of impedance matching output circuit.
This auto-gain circuit mainly applies to the feedback control technology of the adjustable broadband of high-gain voltage-controlled amplifier 2 and realizes automatic control circuit, thereby realize the signal of the preposition reception of ultrasonic wave by this auto-gain circuit, be configured to follow the signal of the extraneous self adaptation state changing, can reach again the control action of the feedback control system of signal automatic gain.
Claims (1)
1. a signal automatic gain circuit for multi-channel gas ultrasonic flowmeter, is characterized in that, high precision operating amplifier output connects the adjustable broadband of high-gain voltage-controlled amplifier input; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects peak sampling hold circuit input; The output of peak sampling hold circuit connects the input of high speed analog-digital conversion A/D converter; The output of high speed analog-digital conversion A/D converter connects the input of MCU gain circuitry control module; The output of gain circuitry control module connects the input of high speed analog-digital conversion D/A converter; The output of high speed analog-digital conversion D/A converter connects voltage-regulating circuit; The output of voltage-regulating circuit connects the adjustable broadband of high-gain voltage-controlled amplifier input; The output of the adjustable broadband of high-gain voltage-controlled amplifier connects the input of impedance matching output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420239784.9U CN203911877U (en) | 2014-05-12 | 2014-05-12 | Signal automatic gain circuit of multichannel gas ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420239784.9U CN203911877U (en) | 2014-05-12 | 2014-05-12 | Signal automatic gain circuit of multichannel gas ultrasonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911877U true CN203911877U (en) | 2014-10-29 |
Family
ID=51786119
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420239784.9U Expired - Fee Related CN203911877U (en) | 2014-05-12 | 2014-05-12 | Signal automatic gain circuit of multichannel gas ultrasonic flowmeter |
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| CN (1) | CN203911877U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441470A (en) * | 2016-09-05 | 2017-02-22 | 广西大学 | Weak magnetic flow detector |
| CN106643926A (en) * | 2016-09-29 | 2017-05-10 | 广西大学 | Weak magnetic flow monitoring meter |
| CN107290013A (en) * | 2017-08-07 | 2017-10-24 | 潍坊奥博仪表科技发展有限公司 | A kind of two-channel ultrasonic flowmeter flow output circuit |
| CN107449475A (en) * | 2017-09-07 | 2017-12-08 | 上海诺仪表有限公司 | Ultrasonic flowmeter |
| CN114353892A (en) * | 2021-12-19 | 2022-04-15 | 上海中核维思仪器仪表有限公司 | Method for intelligently improving metering accuracy reduction caused by transducer aging |
-
2014
- 2014-05-12 CN CN201420239784.9U patent/CN203911877U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441470A (en) * | 2016-09-05 | 2017-02-22 | 广西大学 | Weak magnetic flow detector |
| CN106643926A (en) * | 2016-09-29 | 2017-05-10 | 广西大学 | Weak magnetic flow monitoring meter |
| CN107290013A (en) * | 2017-08-07 | 2017-10-24 | 潍坊奥博仪表科技发展有限公司 | A kind of two-channel ultrasonic flowmeter flow output circuit |
| CN107290013B (en) * | 2017-08-07 | 2020-03-24 | 潍坊奥博仪表科技发展有限公司 | Flow output circuit of dual-channel ultrasonic flowmeter |
| CN107449475A (en) * | 2017-09-07 | 2017-12-08 | 上海诺仪表有限公司 | Ultrasonic flowmeter |
| CN107449475B (en) * | 2017-09-07 | 2024-03-19 | 上海一诺仪表有限公司 | Ultrasonic flowmeter |
| CN114353892A (en) * | 2021-12-19 | 2022-04-15 | 上海中核维思仪器仪表有限公司 | Method for intelligently improving metering accuracy reduction caused by transducer aging |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20210512 |
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| CF01 | Termination of patent right due to non-payment of annual fee |