CN102322905B - Transducer driving circuit of ultrasonic flow meter - Google Patents
Transducer driving circuit of ultrasonic flow meter Download PDFInfo
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- CN102322905B CN102322905B CN2011101346906A CN201110134690A CN102322905B CN 102322905 B CN102322905 B CN 102322905B CN 2011101346906 A CN2011101346906 A CN 2011101346906A CN 201110134690 A CN201110134690 A CN 201110134690A CN 102322905 B CN102322905 B CN 102322905B
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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 transducer driving circuit of ultrasonic flow meter.
Background technology
The principle of transit time ultrasonic flow meters measuring flow is two transducers transmitting-receiving ultrasonic signals that utilize the upstream and downstream symmetric position be installed in pipeline or channel to replace in opposite directions, a moment, the transducers transmit ultrasonic waves signal of upstream, the transducer received ultrasonic signal in downstream; And in another one constantly, the transducer ultrasonic signal in downstream, the transducer received ultrasonic signal of upstream is by measuring following current or the adverse current propagation time difference flow velocity of indirectly measuring fluid of ultrasound wave in medium, again in conjunction with the indirect measuring flow of cross section parameter of pipeline or channel.
The key that transit time ultrasonic flow meters carries out measuring flow is the reception signal that receiving transducer can receive good amplitude, so that analog to digital converter (AD) gathers, existing method for designing is paid close attention to the receiving circuit method for designing all the time, by designing the receiving circuit of wider gain-adjusted scope, to adjust the amplitude that receives signal, be convenient to analog to digital converter (AD) and carry out acquisition process.
Because existing ultrasonic flow meter uses fixed voltage to drive ultrasonic transducer, so that when in very small pipeline or very narrow channel, carrying out flow measurement, the signal amplitude that receiving transducer receives is very large, and when very large pipeline or very wide channel carry out flow measurement, the signal amplitude that receiving transducer receives is very little again, like this for the receiving circuit of same ultrasonic flow meter, need to design very wide gain, can both manage receiving signal within the amplitude range that analog to digital converter (AD) can collect to guarantee to receive in the very large and very little two kinds of situations of amplitude of signal amplitude.So just improved ultrasonic flow meter receiving circuit design difficulty, when causing this ultrasonic flow meter to be used for that very small pipeline and super wide canal capacity are measured, owing to needing the reception signal amplitude scope of conditioning excessive, the receiving circuit gain-adjusted is difficult to receiving signal is saved rational amplitude range, causes satisfying the flow measurement requirement.
The present invention can be according to the difference of measuring pipe diameter size or channel width, can automatically regulate the driving voltage of transducer, guarantee to receive the amplitude of signal within certain scope as far as possible, reduction is to receiving the designing requirement of circuit gain, so that same ultrasonic flow meter can carry out flow measurement in the channel of different tube diameters or different in width.Simultaneously the present invention uses isolating transformer to carry out the impedance matching of transducer, has optimized the transducer drive power demand of ultrasonic flow meter, has reduced to a certain extent the requirement of transducer to driving voltage.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention proposes a kind of transducer driving circuit of ultrasonic flow meter, can automatically regulate the driving voltage of transducer, guarantee to receive the amplitude of signal within certain scope as far as possible, reduction is to receiving the designing requirement of circuit gain, so that same ultrasonic flow meter can carry out flow measurement in the channel of different tube diameters or different in width.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of transducer driving circuit of ultrasonic flow meter, comprise microcontroller, BOOST booster circuit, emission driving circuit, it is characterized in that, microcontroller links to each other with field effect transistor in the BOOST booster circuit by 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 by the emission driving circuit simultaneously.
Microcontroller links to each other by the grid of the field effect transistor 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 field effect transistor drain electrode of emission in the driving circuit, microcontroller is connected with the grid of field effect transistor by driving circuit, the source ground of field effect transistor, the secondary coil of isolating transformer links to each other with ultrasonic transducer.
Beneficial effect of the present invention is, can automatically regulate the driving voltage of transducer, guarantee to receive the amplitude of signal within certain scope as far as possible, reduction is to receiving the designing requirement of circuit gain, so that same ultrasonic flow meter can carry out flow measurement in the channel of different tube diameters or different in width.
Description of drawings
Fig. 1 is 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 certain lower operating voltage in the circuit is increased to certain amplitude, the size of this medium voltate can be regulated by microcontroller, and this circuit adopts the BOOST topological structure.Second portion is the transformer isolation drive part, and this part realizes emission and the driving voltage second lift of transducer drive pulse, makes and carries out electrical isolation between driving circuit and the transducer, realizes simultaneously the coupling of transducer impedance characteristic.
The circuit general structure
New type ultrasonic flowmeter transducer driving circuit general structure as shown in Figure 1, 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 pipe diameter size and the channel width of flow measurement place, the operating voltage V1 of circuit is transferred to certain medium voltate V2 in advance by adjustable booster circuit, then send with equifrequent pulse signal to driving circuit according to the frequency of transducer, medium voltate V2 is amplified to emitting voltage V3 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 large or channel is wide, receive signal very faint, when even the receiving circuit gain-adjusted arrives 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 by the adjustable booster circuit of microprocessor controls, improve medium voltate V2, namely improve emitting voltage V3 to increase driving power, the amplitude that receives signal is improved so that analog to digital converter (AD) gathers.If caliber is little or channel is narrow, receive signal amplitude very large, even the receiving circuit gain-adjusted is to hour, still do not reach the ideal signal scope that analog to digital converter (AD) can gather, then control adjustable booster circuit by controller, reduce medium voltate V2, namely reduce emitting voltage V3, the amplitude that receives signal is reduced so that analog to digital converter (AD) gathers.
Adjustable booster circuit principle
Adjustable booster circuit adopts the BOOST topological structure, utilizes the driving pulse width of microprocessor controls field effect transistor (MOSFET), reaches the purpose of regulation output voltage swing.The BOOST circuit topological structure is comprised of inductance L, commutation diode D, field effect transistor Q and filter capacitor C as shown in Figure 2.Drive chip and be connected with the grid of field effect transistor, the source electrode of field effect transistor and electric capacity one end common ground, the drain electrode of field effect transistor is connected with commutation diode with inductance.Microcontroller is according to the different pulses of sending different in width of ultrasonic flowmeter transducer flow measurement place pipe diameter size and channel width, regulate opening and the shut-in time of control field effect transistor by driving chip, just can be transferred in advance medium voltate V2 to the low-voltage V1 in the circuit board.
Emission driving circuit and transformer isolation circuit
According to the different preset of pipe diameter size and channel width after the adjustable booster circuit, need to send to ultrasonic flowmeter transducer to this medium voltate V2 by the transducer natural frequency, make ultrasonic transducer send ultrasonic signal.This main circuit will be comprised of field effect transistor Q and pulse transformer T, and drive circuit unit is connected with the grid of field effect transistor.The source ground of field effect transistor, the drain electrode of field effect transistor is connected with the primary winding of transformer.As shown in Figure 3, wherein pulse transformer can be with fixing no-load voltage ratio, if the input voltage V1 of adjustable booster circuit is excessively low, ratio is limited and the BOOST circuit boosts, cause its output voltage V 2 to raise limited, then by having the pulse transformer of a rated transformation ratio, realize the second lift of BOOST circuit output voltage V2, launch higher voltage and remove to drive ultrasonic transducer.
The control flow of circuit
Control flow of the present invention as shown in Figure 4, microcontroller is according to parameters such as the pipe diameter size of ultrasonic flow meter flow measurement place or channel width, the output voltage V 2 of default adjustable booster circuit, start transponder pulse during measurement, after V2 isolated lifting by pulse transformer, form emitting voltage V3 rear drive ultrasonic transducer, make it produce ultrasonic signal, postpone to open again receiving circuit after the regular hour, if the ultrasonic signal amplitude V4 that receiving circuit receives is too small, then improve first the gain of receiving circuit, if improve after the receiving circuit gain, receive signal amplitude still too small, then by the adjustable booster circuit of microprocessor controls, improve its output voltage V 2, namely improve emitting 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 first the gain of receiving circuit, if reduce after the receiving circuit gain, receive signal amplitude still excessive, then by the adjustable booster circuit of microprocessor controls, reduce its output voltage V 2, namely reduce emitting voltage V3 and reduce the purpose that receives signal amplitude to reach.By such adjusting, so that when different tube diameters or different in width channel carry out flow measurement, guarantee all the time to receive in the rational scope of amplitude of signal and change.
Claims (2)
1. transducer driving circuit of ultrasonic flow meter, comprise microcontroller, BOOST booster circuit, emission driving circuit, it is characterized in that, microcontroller links to each other with field effect transistor in the BOOST booster circuit by driving circuit, the output voltage of BOOST booster circuit sends to ultrasonic transducer by the emission driving circuit, and microcontroller is used for the size control BOOST booster circuit output voltage size of the ultrasonic signal amplitude that receives according to ultrasonic flow meter measuring channel size or channel width and receiving circuit.
2. a kind of transducer driving circuit of ultrasonic flow meter according to claim 1, it is characterized in that, microcontroller links to each other by the grid of the field effect transistor 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 field effect transistor drain electrode of emission in the driving circuit, microcontroller is connected with the grid of field effect transistor by driving circuit, the source ground of field effect transistor, 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 CN102322905A (en) | 2012-01-18 |
| CN102322905B true CN102322905B (en) | 2013-04-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| 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 |
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 |
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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 |
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| CN102322905A (en) | 2012-01-18 |
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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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