CN203629625U - Signal emitting circuit suitable for liquid ultrasonic flowmeter - Google Patents
Signal emitting circuit suitable for liquid ultrasonic flowmeter Download PDFInfo
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- CN203629625U CN203629625U CN201320734098.4U CN201320734098U CN203629625U CN 203629625 U CN203629625 U CN 203629625U CN 201320734098 U CN201320734098 U CN 201320734098U CN 203629625 U CN203629625 U CN 203629625U
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- 239000007788 liquid Substances 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 230000008054 signal transmission Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 8
- 239000000523 sample Substances 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model relates to an ultrasonic signal emitting circuit, in particular to a signal emitting circuit suitable for a liquid ultrasonic flowmeter. Due to the fact that square signals generated by a single-chip microcomputer of an external circuit controls an analog switch to be turned on and turned off, waveforms which can drive an ultrasonic transducer to work are generated through the charging and discharging processes of a capacitor. The signal emitting circuit suitable for the liquid ultrasonic flowmeter has the advantages of being good in signal waveform stability, good in signal consistency, low in emitting power, simple in structure and especially suitable for being applied to the liquid ultrasonic flowmeter which is powered by batteries or is strict in power consumption requirement.
Description
Technical field
The utility model 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
Measurement sensibility and the precision of the performance of the signal transmission circuit of ultrasonic flow meter to flowmeter has a significant impact.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.Not only complex structure, 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 utility model 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 the utility model: 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 resistance R 3, one end of 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; One end of one end of the other end of resistance R 4 and resistance R 5, one end of resistance R 6, capacitor C 3 is connected and exports 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 capacitor C 1, the other end of capacitor C 2, resistance R 6, the other end of resistance R 7 are all connected with ground GND.
The beneficial effects of the utility model are: signal waveform good stability, signal conformance are good, simple in structure, can meet under the prerequisite of the normal work of ultrasonic probe, 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 utility model;
Fig. 2 is square wave control signal CTRLA sequential chart of the present utility model;
Fig. 3 is square wave control signal CTRLB sequential chart of the present utility model;
Fig. 4 is the sequential chart that transmits of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1,2,3, 4, be applicable to the signal transmission circuit of 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 resistance R 3, one end of 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; One end of one end of the other end of resistance R 4 and resistance R 5, one end of resistance R 6, capacitor C 3 is connected and exports 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 capacitor C 1, the other end of capacitor C 2, resistance R 6, the other end of resistance R 7 are all connected with ground GND; The break-make of square-wave signal control simulation switch that is produced 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, produce the signal of driving ultrasonic probe work by coupling capacitance; Be specially: the break-make of the square-wave signal control simulation switch I C1 being produced by external circuit single-chip microcomputer, the wherein break-make of square-wave signal CTRLA control simulation switch I C1 normally opened contact, 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 are charged, and produces 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 are discharged, produce falling waveform by coupling capacitance C3, produce accordingly and drive transmitting of probe of ultrasonic flowmeter work.
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, produce DC component by electric resistance partial pressure, by electric capacity discharge and recharge generation transmitted waveform, produce the signal that drives ultrasonic probe work by coupling capacitance; Be specially: the break-make of the square-wave signal control simulation switch I C1 being produced by external circuit single-chip microcomputer, the wherein break-make of square-wave signal CTRLA control simulation switch I C1 normally opened contact, 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 are charged, and produces 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 are discharged, produce falling waveform by coupling capacitance C3, 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 case of 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, can realize scheme of the present utility model in conjunction with art technology.
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 resistance R 3, one end of 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; One end of one end of the other end of resistance R 4 and resistance R 5, one end of resistance R 6, capacitor C 3 is connected and exports 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 capacitor C 1, the other end of capacitor C 2, resistance R 6, the other end of resistance R 7 are all connected with ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320734098.4U CN203629625U (en) | 2013-11-20 | 2013-11-20 | Signal emitting circuit suitable for liquid ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320734098.4U CN203629625U (en) | 2013-11-20 | 2013-11-20 | Signal emitting circuit suitable for liquid ultrasonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203629625U true CN203629625U (en) | 2014-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320734098.4U Expired - Lifetime CN203629625U (en) | 2013-11-20 | 2013-11-20 | Signal emitting circuit suitable for liquid ultrasonic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203629625U (en) |
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2013
- 2013-11-20 CN CN201320734098.4U patent/CN203629625U/en not_active Expired - Lifetime
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| C14 | Grant of patent or utility model | ||
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