CN103557897A - Signal emitting circuit suitable for liquid ultrasonic flowmeter - Google Patents
Signal emitting circuit suitable for liquid ultrasonic flowmeter Download PDFInfo
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- CN103557897A CN103557897A CN201310583750.1A CN201310583750A CN103557897A CN 103557897 A CN103557897 A CN 103557897A CN 201310583750 A CN201310583750 A CN 201310583750A CN 103557897 A CN103557897 A CN 103557897A
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Abstract
The invention relates to an ultrasonic signal emitting circuit, in particular to a signal emitting circuit suitable for a liquid ultrasonic flowmeter. On-off of an analog switch is controlled by a square wave signal generated by an external circuit singlechip, and a waveform capable of driving an ultrasonic transducer to work is generated in a capacitive charge-discharge process. The signal emitting circuit of signal waveform, good signal consistency, low emissive power and simple structure, and is particularly suitable for the liquid ultrasonic flowmeters which is powered by batteries or have strict requirements for power consumption.
Description
Technical field
The present invention relates to a kind of ultrasonic signal radiating circuit, particularly a kind of signal transmission circuit that is applicable to liquid ultrasonic flow meter.
Background technology
The performance of the signal transmission circuit of ultrasonic flow meter has a significant impact the Measurement sensibility of flowmeter and precision.Current liquid ultrasonic flow meter signal transmission circuit generally adopts high-frequency impulse drive principle, and pulse amplitude is generally more than tens volts, and frequency is generally between hundreds of K ~ several MHz.Complex structure not only, emission efficiency is low, and emissive power is very large, is not suitable for especially battery powered ultrasonic flow meter.
Summary of the invention
In view of the deficiency that prior art exists, the invention provides a kind of efficient transmitting of high frequency small leak ultrasonic signal driving circuit, i.e. a kind of signal transmission circuit that is applicable to liquid ultrasonic flow meter.Especially be applicable to powered battery or power consumption is required in strict liquid ultrasonic flow meter.
For achieving the above object, the technical scheme of taking is in the present invention: a kind of signal transmission circuit that is applicable to liquid ultrasonic flow meter, is characterized in that: the square-wave signal CTRLA being produced by external circuit single-chip microcomputer is connected with the pin 7 of analog switch IC1; The square-wave signal CTRLB being produced by external circuit single-chip microcomputer is connected with the pin 3 of analog switch IC1; The pin 8 of analog switch IC1 is connected with power supply VCC; The pin 4 of analog switch IC1 is connected with ground GND; The pin 1 of analog switch IC1 is connected with power supply VCC; The pin 5 of analog switch IC1 is connected with ground GND; The pin 2 of analog switch IC1 is connected with one end of resistance R 1; The pin 6 of analog switch IC1 is connected with one end of resistance R 2; The other end of resistance R 1 is connected with the other end of resistance R 2, one end of one end of resistance R 3, capacitor C 1; The other end of resistance R 3 is connected with one end of capacitor C 2, one end of resistance R 4; The other end of resistance R 4 is connected and exports with one end of resistance R 5, one end of one end of resistance R 6, capacitor C 3 and transmits; The other end of resistance R 5 is connected with power supply VCC; The other end of capacitor C 3 is connected with one end of resistance R 7; The other end of the other end of the other end of the other end of capacitor C 1, capacitor C 2, resistance R 6, resistance R 7 is all connected with ground GND; The break-make that is produced the square-wave signal control simulation switch of two kinds of specific time sequence by external circuit single-chip microcomputer, produces DC component by electric resistance partial pressure, by electric capacity discharge and recharge generation transmitted waveform, by coupling capacitance, produce the signal of driving ultrasonic probe work; Be specially: the break-make of the square-wave signal control simulation switch I C1 being produced by external circuit single-chip microcomputer, the break-make of square-wave signal CTRLA control simulation switch I C1 normally opened contact wherein, the break-make of square-wave signal CTRLB control simulation switch I C1 normally closed contact; When nothing transmits, square-wave signal CTRLA is low level, square-wave signal CTRLB is high level, now resistance R 1 is high-impedance state with link, the resistance R 2 of the pin 2 of analog switch IC1 with the link of the pin 6 of analog switch IC1, and capacitor C 1 is with resistance R 4 link voltages with resistance R 3 links, capacitor C 2
; When square-wave signal CTRLA is high level, when square-wave signal CTRLB is high level, analog switch pin 2 is connected with power supply VCC, and analog switch pin 6 is high-impedance state, and capacitor C 1, capacitor C 2 chargings, produce rising waveform by coupling capacitance C3; When square-wave signal CTRLA is low level, when square-wave signal CTRLB is low level, analog switch pin 2 is high-impedance state, analog switch pin 6 is connected with ground GND, capacitor C 1, capacitor C 2 electric discharges, by coupling capacitance C3, produce falling waveform, produce accordingly and drive transmitting of probe of ultrasonic flowmeter work.
The invention has the beneficial effects as follows: signal waveform good stability, signal conformance are good, simple in structure, can meet under the prerequisite of ultrasonic probe normal operation, greatly reduce emissive power, especially under the battery powered occasion of needs, be well positioned to meet high-performance and low-power consumption requirement.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is square wave control signal of the present invention and the sequential chart that transmits.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, 2, a kind of signal transmission circuit that is applicable to liquid ultrasonic flow meter, the square-wave signal CTRLA being produced by external circuit single-chip microcomputer is connected with the pin 7 of analog switch IC1; The square-wave signal CTRLB being produced by external circuit single-chip microcomputer is connected with the pin 3 of analog switch IC1; The pin 8 of analog switch IC1 is connected with power supply VCC; The pin 4 of analog switch IC1 is connected with ground GND; The pin 1 of analog switch IC1 is connected with power supply VCC; The pin 5 of analog switch IC1 is connected with ground GND; The pin 2 of analog switch IC1 is connected with one end of resistance R 1; The pin 6 of analog switch IC1 is connected with one end of resistance R 2; The other end of resistance R 1 is connected with the other end of resistance R 2, one end of one end of resistance R 3, capacitor C 1; The other end of resistance R 3 is connected with one end of capacitor C 2, one end of resistance R 4; The other end of resistance R 4 is connected and exports with one end of resistance R 5, one end of one end of resistance R 6, capacitor C 3 and transmits to liquid probe of ultrasonic flowmeter; The other end of resistance R 5 is connected with power supply VCC; The other end of capacitor C 3 is connected with one end of resistance R 7; The other end of the other end of the other end of the other end of capacitor C 1, capacitor C 2, resistance R 6, resistance R 7 is all connected with ground GND.
Above-mentioned analog switch IC1 model is ADG723BRM, the resistance of resistance R 1 is 1K Ω, the resistance of resistance R 2 is 1K Ω, and the capacitance of capacitor C 1 is 100pF, and the resistance of resistance R 3 is 700 Ω, the capacitance of capacitor C 2 is 100pF, the resistance of electric capacity R4 is 1.5K Ω, and the resistance of resistance R 5 is 10K Ω, and the resistance of resistance R 6 is 10K Ω, the capacitance of capacitor C 3 is 0.1uF, and the resistance of resistance R 7 is 10K Ω.
Above-mentioned said a kind of signal transmission circuit that is applicable to liquid ultrasonic flow meter, the frequency of two groups of square-wave signals that produced by external circuit single-chip microcomputer is 1MHz, and dutycycle is 50%; External circuit single-chip microcomputer need meet and possesses common I/O mouth, the requirement that can produce the signal of 1MHz frequency; The single-chip microcomputer model of selecting is in this example Freescale mkl15z128vlh4, and crystal oscillator is 8MHz, can meet the demands.Power supply VCC is 3.0V, and resistance R 1 and R2 resistance are equal, and the DC component of circuit after the dividing potential drop of resistance R 5 and R6 is 1.5V.
Principle of work: the break-make that is produced the square-wave signal control simulation switch of two kinds of specific time sequence by external circuit single-chip microcomputer, by electric resistance partial pressure, produce DC component, by electric capacity discharge and recharge generation transmitted waveform, by coupling capacitance, produce the signal that drives ultrasonic probe work; Be specially: the break-make of the square-wave signal control simulation switch I C1 being produced by external circuit single-chip microcomputer, the break-make of square-wave signal CTRLA control simulation switch I C1 normally opened contact wherein, the break-make of square-wave signal CTRLB control simulation switch I C1 normally closed contact.When nothing transmits, square-wave signal CTRLA is low level, square-wave signal CTRLB is high level, now resistance R 1 is high-impedance state with link, the resistance R 2 of the pin 2 of analog switch IC1 with the link of the pin 6 of analog switch IC1, and capacitor C 1 is 1.5V with resistance R 3 links, capacitor C 2 with resistance R 4 link voltages.When square-wave signal CTRLA is high level, when square-wave signal CTRLB is high level, analog switch pin 2 is connected with power supply VCC, and analog switch pin 6 is high-impedance state, and capacitor C 1, capacitor C 2 chargings, produce rising waveform by coupling capacitance C3.When square-wave signal CTRLA is low level, when square-wave signal CTRLB is low level, analog switch pin 2 is high-impedance state, analog switch pin 6 is connected with ground GND, capacitor C 1, capacitor C 2 electric discharges, by coupling capacitance C3, produce falling waveform, produce accordingly and drive transmitting of ultrasonic probe work.
The frequency of two groups of specific square-wave signals that the frequency transmitting is produced by external circuit single-chip microcomputer determines, the cycle of two kinds of specific square-wave signals and the speed of capacitor charge and discharge that the amplitude transmitting is produced by external circuit single-chip microcomputer determine; In the situation that the frequency of square-wave signal is certain, the value of adjusting resistance R1, R2, R3, R4, C1, C2 can produce transmitting of various amplitude.
Symmetry while discharging and recharging for assurance, chooses resistance R 1 and equals resistance R 2; The value of capacitor C 3 and resistance R 7 should match with the characteristic of transmit characteristic and ultrasonic probe.
According to the above description, in conjunction with art technology, can realize the solution of the present invention.
Claims (1)
1. a signal transmission circuit that is applicable to liquid ultrasonic flow meter, is characterized in that: the square-wave signal CTRLA being produced by external circuit single-chip microcomputer is connected with the pin 7 of analog switch IC1; The square-wave signal CTRLB being produced by external circuit single-chip microcomputer is connected with the pin 3 of analog switch IC1; The pin 8 of analog switch IC1 is connected with power supply VCC; The pin 4 of analog switch IC1 is connected with ground GND; The pin 1 of analog switch IC1 is connected with power supply VCC; The pin 5 of analog switch IC1 is connected with ground GND; The pin 2 of analog switch IC1 is connected with one end of resistance R 1; The pin 6 of analog switch IC1 is connected with one end of resistance R 2; The other end of resistance R 1 is connected with the other end of resistance R 2, one end of one end of resistance R 3, capacitor C 1; The other end of resistance R 3 is connected with one end of capacitor C 2, one end of resistance R 4; The other end of resistance R 4 is connected and exports with one end of resistance R 5, one end of one end of resistance R 6, capacitor C 3 and transmits; The other end of resistance R 5 is connected with power supply VCC; The other end of capacitor C 3 is connected with one end of resistance R 7; The other end of the other end of the other end of the other end of capacitor C 1, capacitor C 2, resistance R 6, resistance R 7 is all connected with ground GND; The break-make that is produced the square-wave signal control simulation switch of two kinds of specific time sequence by external circuit single-chip microcomputer, produces DC component by electric resistance partial pressure, by electric capacity discharge and recharge generation transmitted waveform, by coupling capacitance, produce the signal of driving ultrasonic probe work; Be specially: the break-make of the square-wave signal control simulation switch I C1 being produced by external circuit single-chip microcomputer, the break-make of square-wave signal CTRLA control simulation switch I C1 normally opened contact wherein, the break-make of square-wave signal CTRLB control simulation switch I C1 normally closed contact; When nothing transmits, square-wave signal CTRLA is low level, square-wave signal CTRLB is high level, now resistance R 1 is high-impedance state with link, the resistance R 2 of the pin 2 of analog switch IC1 with the link of the pin 6 of analog switch IC1, and capacitor C 1 is with resistance R 4 link voltages with resistance R 3 links, capacitor C 2
; When square-wave signal CTRLA is high level, when square-wave signal CTRLB is high level, analog switch pin 2 is connected with power supply VCC, and analog switch pin 6 is high-impedance state, and capacitor C 1, capacitor C 2 chargings, produce rising waveform by coupling capacitance C3; When square-wave signal CTRLA is low level, when square-wave signal CTRLB is low level, analog switch pin 2 is high-impedance state, analog switch pin 6 is connected with ground GND, capacitor C 1, capacitor C 2 electric discharges, by coupling capacitance C3, produce falling waveform, produce accordingly and drive transmitting of probe of ultrasonic flowmeter work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310583750.1A CN103557897B (en) | 2013-11-20 | 2013-11-20 | A kind of signal transmission circuit being applicable to liquid ultrasonic low |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310583750.1A CN103557897B (en) | 2013-11-20 | 2013-11-20 | A kind of signal transmission circuit being applicable to liquid ultrasonic low |
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| CN103557897A true CN103557897A (en) | 2014-02-05 |
| CN103557897B CN103557897B (en) | 2016-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165663A (en) * | 2014-07-15 | 2014-11-26 | 浙江大学 | Ultrasonic signal amplitude detection method applied to low-power-consumption ultrasonic flowmeter |
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| US4114438A (en) * | 1975-12-10 | 1978-09-19 | Crouzet | Devices for measuring the flow speed of a fluid |
| WO2002077576A1 (en) * | 1999-10-07 | 2002-10-03 | Otkrytoe Aktsionernoe Obschestvo 'stroitransgaz' | Ultrasonic flowmeter counter for measuring gas flow |
| CN1453561A (en) * | 2003-01-12 | 2003-11-05 | 王京先 | High-frequency multiple-pulse ultrasonic emission driver and receiving circuit |
| JP4171659B2 (en) * | 2003-02-13 | 2008-10-22 | 愛知時計電機株式会社 | Ultrasonic flow meter |
| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN102147275A (en) * | 2011-03-18 | 2011-08-10 | 中国计量学院 | Low-power-consumption and high-precision ultrasonic flow rate measuring method and device |
| CN102200457A (en) * | 2010-03-26 | 2011-09-28 | 河南新天科技股份有限公司 | Ultrasonic flow detection circuit |
-
2013
- 2013-11-20 CN CN201310583750.1A patent/CN103557897B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4114438A (en) * | 1975-12-10 | 1978-09-19 | Crouzet | Devices for measuring the flow speed of a fluid |
| WO2002077576A1 (en) * | 1999-10-07 | 2002-10-03 | Otkrytoe Aktsionernoe Obschestvo 'stroitransgaz' | Ultrasonic flowmeter counter for measuring gas flow |
| CN1453561A (en) * | 2003-01-12 | 2003-11-05 | 王京先 | High-frequency multiple-pulse ultrasonic emission driver and receiving circuit |
| JP4171659B2 (en) * | 2003-02-13 | 2008-10-22 | 愛知時計電機株式会社 | Ultrasonic flow meter |
| CN102200457A (en) * | 2010-03-26 | 2011-09-28 | 河南新天科技股份有限公司 | Ultrasonic flow detection circuit |
| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN102147275A (en) * | 2011-03-18 | 2011-08-10 | 中国计量学院 | Low-power-consumption and high-precision ultrasonic flow rate measuring method and device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165663A (en) * | 2014-07-15 | 2014-11-26 | 浙江大学 | Ultrasonic signal amplitude detection method applied to low-power-consumption ultrasonic flowmeter |
| CN104165663B (en) * | 2014-07-15 | 2017-04-12 | 浙江大学 | Ultrasonic signal amplitude detection method applied to low-power-consumption ultrasonic flowmeter |
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| CN103557897B (en) | 2016-02-24 |
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