CN102322905A - Transducer driving circuit of ultrasonic flow meter - Google Patents
Transducer driving circuit of ultrasonic flow meter Download PDFInfo
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- CN102322905A CN102322905A CN201110134690A CN201110134690A CN102322905A CN 102322905 A CN102322905 A CN 102322905A CN 201110134690 A CN201110134690 A CN 201110134690A CN 201110134690 A CN201110134690 A CN 201110134690A CN 102322905 A CN102322905 A CN 102322905A
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- ultrasonic flow
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Abstract
The invention relates to a transducer driving circuit of an ultrasonic flow meter, which comprises a microcontroller, a boost circuit and a transmission driving circuit. The transducer driving circuit of the ultrasonic flow meter is characterized in that the microcontroller is connected with a field effect tube in the boost circuit through the driving circuit, the magnitude of the output voltage of the boost circuit is controlled according to the magnitude of the measuring pipe of the ultrasonic flow meter or the width of a channel, i.e. the installed distance of transducers, and at the same time, the microcontroller transmits the output voltage of the boost circuit to the ultrasonic transducers through the transmission driving circuit. The transducer driving circuit of the ultrasonic flow meter has the beneficial effects that the driving voltage of the transducers can be automatically adjusted, the amplitude of received signals is kept within a certain range as much as possible, the design requirement on the gain of a receiving circuit is reduced and one ultrasonic flow meter can be used for measuring flow in pipes with different diameters or channels with different widths.
Description
Technical field
The present invention relates to a kind of driving circuit, especially relate to a kind of ultrasonic flow meter transducer driving circuit.
Background technology
The principle that transit time ultrasonic flow meters is measured flow is two transducers transmitting-receiving ultrasonic signals that utilize the upstream and downstream symmetric position that is installed in pipeline or channel to replace in opposite directions; A moment; The transducers transmit ultrasonic waves signal at the upper reaches, the transducer received ultrasonic signal in downstream; And in another one constantly; The transducer ultrasonic signal in downstream; The transducer received ultrasonic signal at the upper reaches measures indirectly flow rate of fluid through measuring the following current or the adverse current propagation time difference of ultrasound wave in medium, combines the cross section parameter of pipeline or channel to come to measure indirectly flow again.
The key that transit time ultrasonic flow meters is measured flow is the reception signal that receiving transducer can receive good amplitude; So that analog to digital converter (AD) is gathered; Design methods existing is paid close attention to the receiving circuit method for designing all the time; Through designing the receiving circuit of wideer gain-adjusted scope,, be convenient to analog to digital converter (AD) and carry out acquisition process with the amplitude of adjustment reception signal.
Because existing ultrasonic flow meter uses fixed voltage to drive ultrasonic transducer; Make when in very small pipeline or very narrow channel, carrying out flow measurement; The signal amplitude that receiving transducer receives is very big; And when very large pipeline or very wide channel carried out flow measurement, the signal amplitude that receiving transducer receives was very little again, like this for the receiving circuit of same ultrasonic flow meter; Need design very wide gain, with guarantee to receive under the very big and very little two kinds of situation of amplitude of signal amplitude can both receiving signal manage analog to digital converter (AD) within the amplitude range that can collect.So just improved ultrasonic flow meter receiving circuit design difficulty; When causing this ultrasonic flow meter to be used for very small pipeline and ultra wide canal capacity measuring; Owing to need the reception signal amplitude scope of conditioning excessive; The receiving circuit gain-adjusted is difficult to save rational amplitude range to receiving signal, causes satisfying the flow measurement requirement.
The present invention can be according to the difference of measuring caliber size or channel width; Can regulate the driving voltage of transducer automatically; The amplitude that as far as possible guarantees to receive signal is within certain scope; Reduction makes same ultrasonic flow meter can in the channel of different tube diameters or different in width, carry out flow measurement to receiving the designing requirement of circuit gain.The present invention simultaneously uses isolating transformer to carry out the impedance matching of transducer, has optimized the transducer drive power demand of ultrasonic flow meter, has reduced the requirement of transducer to driving voltage to a certain extent.
Summary of the invention
In order to overcome the deficiency of prior art; The present invention proposes a kind of ultrasonic flow meter transducer driving circuit; Can regulate the driving voltage of transducer automatically; The amplitude that as far as possible guarantees to receive signal reduces receiving the designing requirement of circuit gain within certain scope, makes same ultrasonic flow meter can in the channel of different tube diameters or different in width, carry out flow measurement.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of ultrasonic flow meter transducer driving circuit; Comprise microcontroller, BOOST booster circuit, emission driving circuit; It is characterized in that microcontroller links to each other with FET in the BOOST booster circuit through driving circuit, according to ultrasonic flow meter measuring channel size or channel width; Be the mounting distance control BOOST booster circuit output voltage size of transducer, microcontroller sends to ultrasonic transducer to the output voltage of BOOST booster circuit through the emission driving circuit simultaneously.
Microcontroller links to each other through the grid of the FET in driving circuit and the BOOST booster circuit; The output of BOOST booster circuit links to each other with a pin of the isolating transformer primary winding of emission in the driving circuit; Another pin of isolating transformer primary winding links to each other with the FET drain electrode of emission in the driving circuit; Microcontroller is connected with the grid of FET through driving circuit, the source ground of FET, and the secondary coil of isolating transformer links to each other with ultrasonic transducer.
Beneficial effect of the present invention is; Can regulate the driving voltage of transducer automatically; The amplitude that as far as possible guarantees to receive signal is within certain scope; Reduction makes same ultrasonic flow meter can in the channel of different tube diameters or different in width, carry out flow measurement to receiving the designing requirement of circuit gain.
Description of drawings
Fig. 1 is an overall construction drawing of the present invention.
Fig. 2 is adjustable booster circuit schematic diagram.
Fig. 3 is emission driving circuit and isolating transformer circuit diagram.
Fig. 4 is emission driving circuit and isolating transformer work flow diagram.
Embodiment
New type ultrasonic flowmeter transducer driving circuit of the present invention mainly comprises two parts; First is adjustable booster circuit part; The function of this part is the medium voltate that is increased to certain lower WV in the circuit certain amplitude; The size of this medium voltate can be regulated through microcontroller, and this circuit adopts the BOOST topological structure.Second portion is the transformer isolation drive part, and this part realizes the emission and the driving voltage second lift of transducer drive pulse, makes and carries out electrical isolation between driving circuit and the transducer, realizes the coupling of transducer impedance characteristic simultaneously.
The circuit general structure
New type ultrasonic flowmeter transducer driving circuit general structure is as shown in Figure 1, and two major parts comprise microcontroller circuit unit, adjustable booster circuit unit, emission drive circuit unit, transducer impedance coupling and pulse isolation transformer unit totally 5 element circuits altogether.Circuit working principle and control flow are: microcontroller can be according to the caliber size and the channel width of flow measurement place; Arrive certain medium voltate V2 to the WV V1 of circuit through adjustable booster circuit preset; Send with the pulse signal of equifrequent according to the frequency of transducer then and give driving circuit, be amplified to emission voltage V3 to medium voltate V2 to drive ultrasonic transducer through match circuit and pulse transformer according to certain ratio.Receiving circuit receives to such an extent that the size of signal V4 amplitude is carried out gain-adjusted according to receiving transducer; If caliber is big or channel is wide; It is very faint to receive signal, even the receiving circuit gain-adjusted when maximum, still can't make and receive signal and be amplified within the ideal signal scope that analog to digital converter (AD) can gather; Then through the adjustable booster circuit of microprocessor controls; Improve medium voltate V2, promptly improve emission voltage V3, the amplitude that receives signal is improved so that analog to digital converter (AD) is gathered to increase driving power.If caliber is little or channel is narrow; It is very big to receive signal amplitude, even the receiving circuit gain-adjusted does not still reach the ideal signal scope that analog to digital converter (AD) can be gathered to hour; Then control adjustable booster circuit through controller; Reduce medium voltate V2, promptly reduce emission voltage V3, the amplitude that receives signal is reduced so that analog to digital converter (AD) is gathered.
Adjustable booster circuit principle
Adjustable booster circuit adopts the BOOST topological structure, utilizes the driving pulse width of microprocessor controls FET (MOSFET), reaches the purpose of regulating the output voltage size.The BOOST circuit topological structure is as shown in Figure 2, is made up of inductance L, commutation diode D, FET Q and filter capacitor C.Chip for driving is connected with the grid of FET, the source electrode of FET and electric capacity one end common ground, and the drain electrode of FET is connected with commutation diode with inductance.Microcontroller is according to the different pulses of sending different in width of ultrasonic flow meter transducer flow measurement place caliber size and channel width; Regulate opening and the shut-in time of control FET through chip for driving, just can be the low-voltage V1 preset in the circuit board to medium voltate V2.
Emission driving circuit and transformer isolation circuit
According to the different preset of caliber size and channel width after the adjustable booster circuit, need send to the ultrasonic flow meter transducer to this medium voltate V2 by the transducer natural frequency, make ultrasonic transducer send ultrasonic signal.This circuit mainly is made up of FET Q and pulse transformer T, and drive circuit unit is connected with the grid of FET.The source ground of FET, the drain electrode of FET is connected with the primary winding of transformer.As shown in Figure 3; Wherein pulse transformer can have fixedly no-load voltage ratio, if the input voltage V1 of adjustable booster circuit is low excessively, ratio is limited and the BOOST circuit boosts; Cause its output voltage V 2 to raise limited; Then, realize the second lift of BOOST circuit output voltage V2, launch higher voltage and remove to drive ultrasonic transducer through having the pulse transformer of a rated transformation ratio.
The circuit control flow process
Control flow of the present invention is as shown in Figure 4, and microcontroller is according to parameters such as the caliber size of ultrasonic flow meter flow measurement place or channel width, the output voltage V 2 of preset adjustable booster circuit; Start transponder pulse during measurement, isolate lifting to V2 through pulse transformer after, form emission voltage V3 rear drive ultrasonic transducer; Make it produce ultrasonic signal, postpone to open receiving circuit again after the regular hour, if the ultrasonic signal amplitude V4 that receiving circuit receives is too small; Then improve the gain of receiving circuit earlier; If improve after the receiving circuit gain, it is still too small to receive signal amplitude, then through the adjustable booster circuit of microprocessor controls; Improve its output voltage V 2, promptly improve emission voltage V3 and reached the purpose that improves the reception signal amplitude.Otherwise; If the signal amplitude that receiving circuit receives is excessive, then reduce the gain of receiving circuit earlier, if reduce after the receiving circuit gain; It is still excessive to receive signal amplitude; Then, reduce its output voltage V 2, promptly reduce emission voltage V3 and reduce the purpose that receives signal amplitude to reach through the adjustable booster circuit of microprocessor controls.Through such adjusting, make when different tube diameters or different in width channel carry out flow measurement, guarantee all the time to receive in the amplitude reasonable range of signal and change.
Claims (2)
1. ultrasonic flow meter transducer driving circuit; It is characterized in that; Comprise microcontroller, BOOST booster circuit, emission driving circuit; It is characterized in that microcontroller links to each other with FET in the BOOST booster circuit through driving circuit, according to ultrasonic flow meter measuring channel size or channel width; Be the mounting distance control BOOST booster circuit output voltage size of transducer, microcontroller sends to ultrasonic transducer to the output voltage of BOOST booster circuit through the emission driving circuit simultaneously.
2. a kind of ultrasonic flow meter transducer driving circuit according to claim 1; It is characterized in that; Microcontroller links to each other through the grid of the FET in driving circuit and the BOOST booster circuit; The output of BOOST booster circuit links to each other with a pin of the isolating transformer primary winding of emission in the driving circuit, and another pin of isolating transformer primary winding drains with FET in launching driving circuit and links to each other, and microcontroller is connected with the grid of FET through driving circuit; The source ground of FET, the secondary coil of isolating transformer links to each other with ultrasonic transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101346906A CN102322905B (en) | 2011-05-24 | 2011-05-24 | Transducer driving circuit of ultrasonic flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101346906A CN102322905B (en) | 2011-05-24 | 2011-05-24 | Transducer driving circuit of ultrasonic flow meter |
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| CN102322905A true CN102322905A (en) | 2012-01-18 |
| CN102322905B CN102322905B (en) | 2013-04-10 |
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| CN2011101346906A Active CN102322905B (en) | 2011-05-24 | 2011-05-24 | Transducer driving circuit of ultrasonic flow meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443685A (en) * | 2016-09-28 | 2017-02-22 | 深圳市众凌汇科技有限公司 | Power adjustable wireless fish probing device |
| CN106680369A (en) * | 2017-02-23 | 2017-05-17 | 天健创新（北京）监测仪表股份有限公司 | Ultrasonic mud-water interface measuring device and method |
| CN114295169A (en) * | 2021-12-30 | 2022-04-08 | 浙江磐博科技有限公司 | Automatic adjustment system and method for ultrasonic signals of gas ultrasonic flowmeter |
| CN117029975A (en) * | 2023-10-09 | 2023-11-10 | 成都千嘉科技股份有限公司 | Multi-environment self-adaption method of ultrasonic gas meter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678133A (en) * | 2004-03-31 | 2005-10-05 | 三洋电机株式会社 | Transmitting apparatus, sound sensor and autonomous traveling vehicle |
| CN101819184A (en) * | 2010-04-01 | 2010-09-01 | 江苏大学 | Pulse ultrasonic wave transmitting circuit |
| CN101839747A (en) * | 2010-04-30 | 2010-09-22 | 常州联力自动化科技有限公司 | Ultrasonic water level sensor for mines |
-
2011
- 2011-05-24 CN CN2011101346906A patent/CN102322905B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678133A (en) * | 2004-03-31 | 2005-10-05 | 三洋电机株式会社 | Transmitting apparatus, sound sensor and autonomous traveling vehicle |
| CN101819184A (en) * | 2010-04-01 | 2010-09-01 | 江苏大学 | Pulse ultrasonic wave transmitting circuit |
| CN101839747A (en) * | 2010-04-30 | 2010-09-22 | 常州联力自动化科技有限公司 | Ultrasonic water level sensor for mines |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443685A (en) * | 2016-09-28 | 2017-02-22 | 深圳市众凌汇科技有限公司 | Power adjustable wireless fish probing device |
| CN106680369A (en) * | 2017-02-23 | 2017-05-17 | 天健创新（北京）监测仪表股份有限公司 | Ultrasonic mud-water interface measuring device and method |
| CN106680369B (en) * | 2017-02-23 | 2024-02-09 | 天健创新（北京）监测仪表股份有限公司 | Ultrasonic mud-water interface measuring device and method |
| CN114295169A (en) * | 2021-12-30 | 2022-04-08 | 浙江磐博科技有限公司 | Automatic adjustment system and method for ultrasonic signals of gas ultrasonic flowmeter |
| CN114295169B (en) * | 2021-12-30 | 2022-07-29 | 浙江磐博科技有限公司 | Automatic adjustment system and method for ultrasonic signals of gas ultrasonic flowmeter |
| CN117029975A (en) * | 2023-10-09 | 2023-11-10 | 成都千嘉科技股份有限公司 | Multi-environment self-adaption method of ultrasonic gas meter |
| CN117029975B (en) * | 2023-10-09 | 2023-12-15 | 成都千嘉科技股份有限公司 | Multi-environment self-adaption method of ultrasonic gas meter |
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| CN102322905B (en) | 2013-04-10 |
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Effective date of registration: 20171127 Address after: 211106 Jiangning City, Nanjing Province, the integrity of the road No. 19, Co-patentee after: NARI Technology Development Co., Ltd. Patentee after: State Grid Electric Power Research Insititute Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee before: Nanjing Nari Co., Ltd. Patentee before: State Grid Electric Power Research Insititute |
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