CN111600562A - Control circuit with continuously adjustable amplification gain - Google Patents
Control circuit with continuously adjustable amplification gain Download PDFInfo
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- CN111600562A CN111600562A CN202010424258.XA CN202010424258A CN111600562A CN 111600562 A CN111600562 A CN 111600562A CN 202010424258 A CN202010424258 A CN 202010424258A CN 111600562 A CN111600562 A CN 111600562A
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- 230000003321 amplification Effects 0.000 title claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
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Abstract
The invention provides a control circuit with continuously adjustable amplification gain. The circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, an amplifier U1 and a digital potentiometer U2. The amplification gain continuously adjustable control circuit amplifies the ultrasonic signals by continuously adjustable amplification factor through the amplifier U1, the digital potentiometer U2 and the second resistor R2, selects the resistance value of the digital potentiometer U2 according to actual conditions, and amplifies the ultrasonic signals by the amplifier U1 to realize the continuous adjustment of the gain of the ultrasonic signals. The invention can continuously adjust the peak value of the ultrasonic signal in real time through the amplifying gain continuously adjustable control circuit, so that the peak value of the ultrasonic signal is kept in a reasonable peak value interval, thereby realizing the accuracy and the stability of the measurement.
Description
Technical Field
The invention belongs to the technical field of metering control of instruments, and particularly relates to an amplification gain continuously adjustable control circuit.
Background
The ultrasonic gas meter is a representative of a new metering technology, is applied due to the advantages of high precision, small volume, simple mechanical structure, long service life, simple maintenance and the like, and is widely applied in real life.
However, in the ultrasonic measurement process, the change of the amplitude of the ultrasonic signal is caused by the difference of the temperature, the pressure, the density and the flow rate of the gas in the pipeline, and in order to accurately measure the gas, the ultrasonic gas meter needs to adjust the ultrasonic signal in real time and adjust the ultrasonic signal to a reasonable range.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a control circuit with continuously adjustable amplification gain.
The control circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, an amplifier U1 and a digital potentiometer U2.
One end of the first resistor R1 is connected with the non-inverting input end of the amplifier U1, and the other end of the first resistor R1 is used as a signal input end; the P0W end and the P0A end of the digital potentiometer U2 and one end of a second resistor R2 are connected with the inverting input end of the amplifier U1, and the other end of the second resistor R2 is grounded; the P0B of the digital potentiometer U2 is terminated with the output end of the amplifier U1 to be used as a signal output end; the power supply positive terminal of the amplifier U1 and one end of the first capacitor C1 are connected and then connected with the power supply terminal VDD _ S, and the power supply negative terminal of the amplifier U1 and the other end of the first capacitor C1 are grounded; the HCV/A0 of the digital potentiometer U2 is terminated at one end of a third resistor R3; the SCL end of the digital potentiometer U2 and one end of the fourth resistor R4 are connected with the I2C _ SCL end of the MCU main control chip; the SDA end of the digital potentiometer U2 and one end of the fifth resistor R5 are connected with the I2C _ SDA end of the MCU main control chip; the other end of the third resistor R3, the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are connected with a VDD _ S power supply end; the positive power supply terminal of the digital potentiometer U2 is connected with one end of the second capacitor C2 and then connected with the power supply terminal VDD _ S, and the negative power supply terminal of the digital potentiometer U2 and the other end of the second capacitor C2 are grounded.
The specific parameters of each element are as follows: the resistance of the first resistor R1 is 10K omega, the resistance of the second resistor R2 is 1K omega, the resistance of the third resistor R3 is 10K omega, the resistance of the fourth resistor R4 is 10K omega, the resistance of the fifth resistor R5 is 10K omega, the capacity of the first capacitor C1 is 100nF, and the capacity of the second capacitor C2 is 100 nF.
The invention has the following beneficial effects:
the invention can continuously adjust the peak value of the ultrasonic signal in real time through the amplifying gain continuously adjustable control circuit, so that the peak value of the ultrasonic signal is kept in a reasonable peak value interval, thereby realizing the accuracy and the stability of the measurement.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The invention is further explained below with reference to the figures and examples.
As shown in fig. 1, a control circuit for continuously adjusting amplification gain includes an amplifier, a digital potentiometer, two capacitors and five resistors.
One end of the first resistor R1 is connected with the non-inverting input end of the amplifier U1, and the other end of the first resistor R1 is used as a signal input end; the P0W end and the P0A end of the digital potentiometer U2 and one end of a second resistor R2 are connected with the inverting input end of the amplifier U1, and the other end of the second resistor R2 is grounded; the P0B of the digital potentiometer U2 is terminated with the output end of the amplifier U1 to be used as a signal output end; the power supply positive terminal of the amplifier U1 and one end of the first capacitor C1 are connected and then connected with the power supply terminal VDD _ S, and the power supply negative terminal of the amplifier U1 and the other end of the first capacitor C1 are grounded; the HCV/A0 of the digital potentiometer U2 is terminated at one end of a third resistor R3; the SCL end of the digital potentiometer U2 and one end of the fourth resistor R4 are connected with the I2C _ SCL end of the MCU main control chip; the SDA end of the digital potentiometer U2 and one end of the fifth resistor R5 are connected with the I2C _ SDA end of the MCU main control chip; the other end of the third resistor R3, the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are connected with a VDD _ S power supply end; the positive power supply terminal of the digital potentiometer U2 is connected with one end of the second capacitor C2 and then connected with the power supply terminal VDD _ S, and the negative power supply terminal of the digital potentiometer U2 and the other end of the second capacitor C2 are grounded.
The specific parameters of each element are as follows: the resistance of the first resistor R1 is 10K omega, the resistance of the second resistor R2 is 1K omega, the resistance of the third resistor R3 is 10K omega, the resistance of the fourth resistor R4 is 10K omega, the resistance of the fifth resistor R5 is 10K omega, the capacity of the first capacitor C1 is 100nF, and the capacity of the second capacitor C2 is 100 nF.
The digital potentiometer is a digital adjustable resistor network, wherein P0A is connected with the 0 resistance end of the resistor network, P0B is connected with the maximum resistance end of the resistor network, and P0W is the tap end of the adjustable resistor of the digital potentiometer, and the P0W end is controlled to move between the POA end and the P0B end through the SCL and the SDA end of the digital potentiometer control end, so that the continuously adjustable resistance value in the resistor network is obtained between the P0W end and the P0B end.
The amplification gain continuously adjustable control circuit amplifies the ultrasonic signals by continuously adjustable amplification factor through the amplifier U1, the digital potentiometer U2 and the second resistor R2, selects the resistance value of the digital potentiometer U2 according to actual conditions, and amplifies the ultrasonic signals by the amplifier U1 to realize the continuous adjustment of the gain of the ultrasonic signals.
Claims (2)
1. The control circuit is characterized by comprising a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, an amplifier U1 and a digital potentiometer U2;
one end of the first resistor R1 is connected with the non-inverting input end of the amplifier U1, and the other end of the first resistor R1 is used as a signal input end; the P0W end and the P0A end of the digital potentiometer U2 and one end of a second resistor R2 are connected with the inverting input end of the amplifier U1, and the other end of the second resistor R2 is grounded; the P0B of the digital potentiometer U2 is terminated with the output end of the amplifier U1 to be used as a signal output end; the power supply positive terminal of the amplifier U1 and one end of the first capacitor C1 are connected and then connected with the power supply terminal VDD _ S, and the power supply negative terminal of the amplifier U1 and the other end of the first capacitor C1 are grounded; the HCV/A0 of the digital potentiometer U2 is terminated at one end of a third resistor R3; the SCL end of the digital potentiometer U2 and one end of the fourth resistor R4 are connected with the I2C _ SCL end of the MCU main control chip; the SDA end of the digital potentiometer U2 and one end of the fifth resistor R5 are connected with the I2C _ SDA end of the MCU main control chip; the other end of the third resistor R3, the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are connected with a VDD _ S power supply end; the positive power supply terminal of the digital potentiometer U2 is connected with one end of the second capacitor C2 and then connected with the power supply terminal VDD _ S, and the negative power supply terminal of the digital potentiometer U2 and the other end of the second capacitor C2 are grounded.
2. The continuous adjustable amplification gain control circuit of claim 1, wherein the specific parameters of each element are as follows: the resistance of the first resistor R1 is 10K omega, the resistance of the second resistor R2 is 1K omega, the resistance of the third resistor R3 is 10K omega, the resistance of the fourth resistor R4 is 10K omega, the resistance of the fifth resistor R5 is 10K omega, the capacity of the first capacitor C1 is 100nF, and the capacity of the second capacitor C2 is 100 nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010424258.XA CN111600562A (en) | 2020-05-19 | 2020-05-19 | Control circuit with continuously adjustable amplification gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010424258.XA CN111600562A (en) | 2020-05-19 | 2020-05-19 | Control circuit with continuously adjustable amplification gain |
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| Publication Number | Publication Date |
|---|---|
| CN111600562A true CN111600562A (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010424258.XA Pending CN111600562A (en) | 2020-05-19 | 2020-05-19 | Control circuit with continuously adjustable amplification gain |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451864A (en) * | 2008-12-22 | 2009-06-10 | 合肥工业大学 | Improved low power consumption two-wire system vortex shedding flowmeter |
| CN101858770A (en) * | 2009-04-09 | 2010-10-13 | 深圳迈瑞生物医疗电子股份有限公司 | Liquid level detection device and sample adding system |
| CN101881638A (en) * | 2009-05-12 | 2010-11-10 | 石家庄西比克仪表有限公司 | Vortex street flowmeter signal digital processing system based on MCU (Microprogrammed Control Unit) |
| JP2013229769A (en) * | 2012-04-26 | 2013-11-07 | Nippon Dempa Kogyo Co Ltd | Temperature compensation type crystal oscillator, and manufacturing method and adjustment method therefor |
| CN203368410U (en) * | 2013-08-08 | 2013-12-25 | 上海理工大学 | Pre-amplification circuit capable of realizing automatic gain adjustment for current output-type sensor |
| CN204134045U (en) * | 2014-10-13 | 2015-02-04 | 中国人民解放军第三军医大学第三附属医院 | For the stimulating system of musical electric gastrointestinal pacemaker |
| CN106053347A (en) * | 2016-08-15 | 2016-10-26 | 深圳市清时捷科技有限公司 | Turbidity measuring circuit |
| CN205940708U (en) * | 2016-08-09 | 2017-02-08 | 北京雨根科技有限公司 | Ultrasonic wave level transducer |
| CN206583498U (en) * | 2017-03-08 | 2017-10-24 | 中国计量大学 | A kind of quick measuring circuit of ultrasonic transducer signal |
| CN206920624U (en) * | 2017-04-07 | 2018-01-23 | 苏州福田激光精密仪器有限公司 | A kind of laser detector that can automatically adjust gain |
-
2020
- 2020-05-19 CN CN202010424258.XA patent/CN111600562A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451864A (en) * | 2008-12-22 | 2009-06-10 | 合肥工业大学 | Improved low power consumption two-wire system vortex shedding flowmeter |
| CN101858770A (en) * | 2009-04-09 | 2010-10-13 | 深圳迈瑞生物医疗电子股份有限公司 | Liquid level detection device and sample adding system |
| CN101881638A (en) * | 2009-05-12 | 2010-11-10 | 石家庄西比克仪表有限公司 | Vortex street flowmeter signal digital processing system based on MCU (Microprogrammed Control Unit) |
| JP2013229769A (en) * | 2012-04-26 | 2013-11-07 | Nippon Dempa Kogyo Co Ltd | Temperature compensation type crystal oscillator, and manufacturing method and adjustment method therefor |
| CN203368410U (en) * | 2013-08-08 | 2013-12-25 | 上海理工大学 | Pre-amplification circuit capable of realizing automatic gain adjustment for current output-type sensor |
| CN204134045U (en) * | 2014-10-13 | 2015-02-04 | 中国人民解放军第三军医大学第三附属医院 | For the stimulating system of musical electric gastrointestinal pacemaker |
| CN205940708U (en) * | 2016-08-09 | 2017-02-08 | 北京雨根科技有限公司 | Ultrasonic wave level transducer |
| CN106053347A (en) * | 2016-08-15 | 2016-10-26 | 深圳市清时捷科技有限公司 | Turbidity measuring circuit |
| CN206583498U (en) * | 2017-03-08 | 2017-10-24 | 中国计量大学 | A kind of quick measuring circuit of ultrasonic transducer signal |
| CN206920624U (en) * | 2017-04-07 | 2018-01-23 | 苏州福田激光精密仪器有限公司 | A kind of laser detector that can automatically adjust gain |
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Application publication date: 20200828 |