CN119549382A - Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter - Google Patents
Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter Download PDFInfo
- Publication number
- CN119549382A CN119549382A CN202411974093.8A CN202411974093A CN119549382A CN 119549382 A CN119549382 A CN 119549382A CN 202411974093 A CN202411974093 A CN 202411974093A CN 119549382 A CN119549382 A CN 119549382A
- Authority
- CN
- China
- Prior art keywords
- transducer
- excitation
- unit
- signal
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a transducer excitation circuit, an ultrasonic metering device and an ultrasonic gas meter, wherein the transducer excitation circuit comprises a receiving and transmitting switching module and a two-way excitation module, the receiving and transmitting switching module is respectively connected with a first transducer and a second transducer and is connected with a switching control signal, one of the first transducer and the second transducer is used for controlling the first transducer to be an excitation transducer according to the switching control signal, the other transducer is a receiving transducer, the two-way excitation module is connected with the receiving and transmitting switching module and is connected with a clock signal, and the two-way excitation module is used for transmitting a first power signal to the positive end of the excitation transducer and transmitting a second power signal to the negative end when the clock signal is at a first level, and transmitting a second power signal to the positive end of the excitation transducer and transmitting the first power signal to the negative end when the clock signal is at a second level. The embodiment of the invention can utilize bidirectional excitation, can increase the amplitude by one time compared with the traditional unidirectional excitation, does not need a booster circuit, and does not bring related switching noise.
Description
Technical Field
The invention relates to the technical field of ultrasonic metering, in particular to a transducer excitation circuit, an ultrasonic metering device and an ultrasonic gas meter.
Background
The power supply voltage of the ultrasonic gas meter and the pulse wave voltage of the ultrasonic transducer transmitting circuit in the ultrasonic gas meter are usually smaller, so that the original ultrasonic signal received by the receiving end of the ultrasonic transducer is smaller, the signal to noise ratio is also low, and particularly when the ultrasonic signal is applied to a specific scene, for example, when the ultrasonic signal is transmitted in methane and hydrogen, attenuation is more serious than that when the ultrasonic signal is transmitted in air, therefore, the received ultrasonic signal is lower, and difficulties are brought to a back-end amplifying circuit and signal processing. In order to solve the problems, the amplitude of the ultrasonic signal is usually increased by increasing the voltage of the exciting circuit or increasing the sensitivity of the transducer, but the former needs to use a booster circuit, which leads to the problems of increased cost, increased occupied area of a board card and switch noise interference, and the latter needs to adjust parameters of the transducer to increase the amplitude of the output signal, but changes the resonant frequency, bandwidth and other many parameters of the transducer, so that the performance of the transducer becomes unstable and the amplitude increasing effect is limited.
Disclosure of Invention
The invention provides a transducer excitation circuit, an ultrasonic metering device and an ultrasonic gas meter, which can double the amplitude compared with the traditional unidirectional excitation on the basis of ensuring the stability of a transducer by utilizing bidirectional excitation, does not need a booster circuit, and does not bring related switching noise.
According to an aspect of the present invention, there is provided a transducer excitation circuit comprising:
The receiving and transmitting switching module is used for controlling one of the first transducer and the second transducer to be an excitation transducer and the other to be a receiving transducer according to the switching control signal;
the bidirectional excitation module is used for transmitting the first power supply signal to the positive end of the excitation transducer through the transceiver switching module and transmitting the second power supply signal to the negative end of the excitation transducer when the clock signal is at a first level, transmitting the second power supply signal to the positive end of the excitation transducer through the transceiver switching module and transmitting the first power supply signal to the negative end of the excitation transducer when the clock signal is at a second level, wherein the first level is different from the second level, and the voltages of the first power supply signal and the second power supply signal are different.
Optionally, the bi-directional excitation module includes:
the system comprises a first excitation unit, a second excitation unit, a first power supply signal, a second power supply signal, a transceiver switching module, a first power supply signal and a second power supply signal, wherein a control end of the first excitation unit is connected with the clock signal, a first connecting end of the first excitation unit is connected with the first power supply signal, a second connecting end of the first excitation unit is connected with the second power supply signal, and a public end of the first excitation unit is connected with the transceiver switching module;
The control end of the second excitation unit is connected with the clock signal, the first connecting end of the second excitation unit is connected with the second power signal, the second connecting end of the second excitation unit is connected with the first power signal, and the public end of the second excitation unit is connected with the transceiver switching module; the second excitation unit is used for controlling the public end of the second excitation unit to be communicated with the first connection end or the second connection end of the second excitation unit according to the clock signal.
Optionally, the transceiver switching module includes:
The receiving and transmitting switching sub-module is respectively connected with the public end of the first excitation unit, the public end of the second excitation unit, the positive end of the first transducer, the negative end of the first transducer, the positive end of the second transducer and the negative end of the second transducer, and is accessed into a switching control signal; the transceiver switching submodule is used for transmitting a signal of the public end of the first excitation unit to the positive end of the first transducer and transmitting a signal of the public end of the second excitation unit to the negative end of the first transducer when the switching control signal is at the first level, and is used for transmitting a signal of the public end of the first excitation unit to the positive end of the second transducer and transmitting a signal of the public end of the second excitation unit to the negative end of the second transducer when the switching control signal is at the second level;
The control end of the voltage control unit is connected with the switching control signal, the public end of the voltage control unit is grounded, the first connecting end of the voltage control unit is connected with the negative end of the second energy converter, and the second connecting end of the voltage control unit is connected with the negative end of the first energy converter;
the control end of the signal transmission unit is connected with the switching control signal, the public end of the signal transmission unit is used for outputting an ultrasonic echo electric signal output by the receiving transducer, the first connecting end of the signal transmission unit is connected with the positive end of the second transducer, and the second connecting end of the signal transmission unit is connected with the positive end of the first transducer; the signal transmission unit is used for controlling the common end of the signal transmission unit to be communicated with the first connecting end or the second connecting end of the signal transmission unit according to the switching control signal.
Optionally, the transceiver switching submodule includes a first switching unit and a second switching unit;
The control end of the first switching unit is connected with the switching control signal, the public end of the first switching unit is connected with the public end of the first excitation unit, the first connecting end of the first switching unit is connected with the positive end of the first energy converter, and the second connecting end of the first switching unit is connected with the positive end of the second energy converter;
The control end of the second switching unit is connected with the switching control signal, the public end of the second switching unit is connected with the public end of the second excitation unit, the first connecting end of the second switching unit is connected with the negative end of the first transducer, the second connecting end of the second switching unit is connected with the negative end of the second transducer, and the second switching unit is used for controlling the public end of the second switching unit to be communicated with the first connecting end or the second connecting end of the second switching unit according to the switching control signal.
Optionally, the first excitation unit, the second excitation unit, the voltage control unit, the signal transmission unit, the first switching unit and the second switching unit all comprise analog switch chips.
Optionally, the voltage of the first level is greater than the voltage of the second level, and the voltage of the first power supply signal is greater than the voltage of the second power supply signal;
And/or the number of the groups of groups,
One of the first power supply signal and the second power supply signal is a 3.3V direct-current voltage signal, and the other is a ground signal.
According to another aspect of the invention there is provided an ultrasonic metrology apparatus comprising a first transducer, a second transducer and a transducer excitation circuit as provided in any of the embodiments above.
Optionally, the ultrasonic metering device further comprises an amplifying circuit, wherein the input end of the amplifying circuit is connected with the receiving and transmitting switching module, the receiving and transmitting switching module is used for transmitting the ultrasonic echo electric signal output by the receiving transducer to the input end of the amplifying circuit, and the amplifying circuit is used for amplifying the ultrasonic echo electric signal to obtain an amplified echo signal and outputting the amplified echo signal.
Optionally, the ultrasonic metering device further comprises a control module which is respectively connected with the receiving and transmitting switching module, the bidirectional excitation module and the output end of the amplifying circuit, wherein the control module is used for outputting the switching control signal and the clock signal and processing the amplified echo signal.
According to another aspect of the present invention, there is provided an ultrasonic gas meter including the ultrasonic metering device provided by the above embodiment.
The transducer excitation circuit provided by the embodiment of the invention is provided with a receiving-transmitting switching module and a bidirectional excitation module. The receiving and transmitting switching module can flexibly control the receiving and transmitting relation between the first transducer and the second transducer according to the switching control signal, so that the flexibility of the ultrasonic metering device is improved. Compared with the method that the negative end of the excitation transducer is grounded, only the positive end of the excitation transducer is excited in a single direction by pulse excitation, the excitation is doubled by the double-direction excitation energy, and then the ultrasonic signal received by the receiving transducer is doubled. That is, under the same noise interference condition, the excitation transducer is excited in a two-way manner, and under the condition that the excitation voltage amplitude is not increased, the excitation time can be doubled so as to realize the excitation doubling effect, and then the signal-to-noise ratio is doubled, so that the quality of an ultrasonic signal received by the receiving transducer is increased, and the error of the ultrasonic metering device is reduced. Therefore, a booster circuit is not required to be provided in the embodiment of the invention, the switch noise interference related to boosting is not brought, and the embodiment of the invention does not need to adjust the parameters of the transducer, so that the stability of the transducer can be effectively ensured.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a structure of a transducer excitation circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another transducer excitation circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another transducer excitation circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another transducer excitation circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an ultrasonic metering device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a transducer excitation circuit for realizing bidirectional excitation of a transducer. Fig. 1 is a schematic structural diagram of a transducer excitation circuit according to an embodiment of the present invention, and referring to fig. 1, the transducer excitation circuit includes a transceiver switching module 10 and a bidirectional excitation module 20. The transceiver switching module 10 is respectively connected to the first transducer HNQ1 and the second transducer HNQ2 and is connected to a switching control signal hnq_cs, and the transceiver switching module 10 is configured to control one of the first transducer HNQ1 and the second transducer HNQ2 to be an excitation transducer and the other to be a receiving transducer according to the switching control signal hnq_cs. The bidirectional excitation module 20 is connected with the transceiver switching module 10 and is connected with the clock signal CLK, the first power signal V1 and the second power signal V2, the bidirectional excitation module 20 is used for transmitting the first power signal V1 to the positive end of the excitation transducer through the transceiver switching module 10 and transmitting the second power signal V2 to the negative end of the excitation transducer when the clock signal CLK is at a first level, and transmitting the second power signal V2 to the positive end of the excitation transducer through the transceiver switching module 10 and transmitting the first power signal V1 to the negative end of the excitation transducer when the clock signal CLK is at a second level, wherein the first level is different from the second level, and the voltages of the first power signal V1 and the second power signal V2 are different.
The first transducer HNQ1 and the second transducer HNQ2 can mutually send and receive ultrasonic signals, and the received ultrasonic signals are processed and then transmitted to a signal processing component in the ultrasonic metering device for analysis, so that the measurement of an ultrasonic transmission medium between the first transducer HNQ1 and the second transducer HNQ2 is completed. The transmission medium may for example be gas, i.e. based on the first transducer HNQ1 and the second transducer HNQ2 may be used for realizing metering of gas.
The transceiver switching module 10 is specifically configured to control the transceiving relation between the first transducer HNQ1 and the second transducer HNQ2 according to the level of the switching control signal hnq_cs. For example, when the switch control signal hnq_cs is at a first level, the transceiver switch module 10 controls the first transducer HNQ1 to be an excitation transducer and the second transducer HNQ2 to be a receiving transducer, and when the switch control signal hnq_cs is at a second level, the transceiver switch module 10 controls the first transducer HNQ1 to be a receiving transducer and the second transducer HNQ2 to be an excitation transducer. The bidirectional excitation module 20 provides an excitation signal to the excitation transducer through the transceiver switching module 10, and the receiving transducer outputs an ultrasonic electric signal sg_out1 through the transceiver switching module 10.
The clock signal CLK is a pulse signal in which a first level and a second level alternately appear according to a certain rule. In this embodiment, when the clock signal CLK is at the first level, the positive and negative ends of the excitation transducer are the first power signal V1 and the second power signal V2, respectively, and when the clock signal CLK is at the second level, the positive and negative ends of the excitation transducer are the second power signal V2 and the first power signal V1, respectively, and may also be excited. That is, no matter the clock signal CLK is at the first level or the second level, the voltage difference between the first power signal V1 and the second power signal V2 is present between the positive and negative ends of the excitation transducer, so that the two-way excitation is realized.
One of the first power signal V1 and the second power signal V2 is a power supply voltage of a device (e.g., an ultrasonic meter device) where the transducer excitation circuit is located, and the other is a ground signal. The supply voltage is, for example, 3.3V.
In the transducer excitation circuit provided by the embodiment of the invention, a transceiver switching module 10 and a bidirectional excitation module 20 are arranged. The transceiver switching module 10 can flexibly control the transceiver relationship between the first transducer HNQ1 and the second transducer HNQ2 according to the switching control signal hnq_cs, thereby improving the flexibility of the ultrasonic metering device. The bi-directional excitation is achieved by the bi-directional excitation module 20, and compared to the uni-directional excitation where the negative end of the excitation transducer is grounded, only the positive end is pulsed, the excitation is doubled by the bi-directional excitation energy, which in turn doubles the ultrasonic signal received by the receiving transducer. That is, under the same noise interference condition, the excitation transducer is excited in a two-way manner, and under the condition that the excitation voltage amplitude is not increased, the excitation time can be doubled so as to realize the excitation doubling effect, and then the signal-to-noise ratio is doubled, so that the quality of an ultrasonic signal received by the receiving transducer is increased, and the error of the ultrasonic metering device is reduced. Therefore, a booster circuit is not required to be provided in the embodiment of the invention, the switch noise interference related to boosting is not brought, and the embodiment of the invention does not need to adjust the parameters of the transducer, so that the stability of the transducer can be effectively ensured.
In addition to the above embodiments, one of the first level and the second level may be at a high level, and the other may be at a low level, for example, the voltage of the first level may be set to be greater than the voltage of the second level. One of the first power signal V1 and the second power signal V2 is high voltage, and the other is low voltage, for example, the voltage of the first power signal V1 may be set to be greater than the voltage of the second power signal V2. Specifically, one of the first power signal V1 and the second power signal V2 is a dc voltage signal of 3.3V, and the other is a ground signal. The voltage of each signal may be set according to actual requirements, and is not particularly limited herein.
Referring to fig. 1, taking the first power signal V1 as 3.3V and the second power signal V2 as a ground signal (e.g., 0V) as an example, the specific operation of the transducer excitation circuit may be:
When the switching control signal hnq_cs is at the first level, the transceiver switching module 10 controls the first transducer HNQ1 to be an excitation transducer and the second transducer HNQ2 to be a receiving transducer. In this case, when the clock signal CLK is at the first level, the first power signal V1 accessed by the bidirectional excitation module 20 is transmitted to the positive terminal of the first transducer HNQ1 through the transceiver switching module 10, and the second power signal V2 accessed by the bidirectional excitation module 20 is transmitted to the negative terminal of the first transducer HNQ1 through the transceiver switching module 10, at this time, the voltage at the positive terminal of the first transducer HNQ1 is 3.3V, and the negative terminal of the first transducer HNQ1 is grounded, that is, the voltage at the negative terminal is 0V. When the clock signal CLK is at the second level, the second power signal V2 received by the bidirectional excitation module 20 is transmitted to the positive terminal of the first transducer HNQ1 through the transceiver switching module 10, and the first power signal V1 received by the bidirectional excitation module 20 is transmitted to the negative terminal of the first transducer HNQ1 through the transceiver switching module 10, at this time, the positive terminal of the first transducer HNQ1 is grounded, that is, the voltage at the positive terminal is 0V, and the voltage at the negative terminal of the first transducer HNQ1 is 3.3V.
When the switching control signal hnq_cs is at the second level, the transceiver switching module 10 controls the first transducer HNQ1 to be a receiving transducer and the second transducer HNQ2 to be an exciting transducer. In this case, when the clock signal CLK is at the first level, the first power signal V1 accessed by the bidirectional excitation module 20 is transmitted to the positive terminal of the second transducer HNQ2 through the transceiver switching module 10, the second power signal V2 accessed by the bidirectional excitation module 20 is transmitted to the negative terminal of the second transducer HNQ2 through the transceiver switching module 10, at this time, the voltage at the positive terminal of the second transducer HNQ2 is 3.3V, the negative terminal of the second transducer HNQ2 is grounded, that is, the voltage at the negative terminal is 0V, and when the clock signal CLK is at the second level, the second power signal V2 accessed by the bidirectional excitation module 20 is transmitted to the positive terminal of the second transducer HNQ2 through the transceiver switching module 10, the first power signal V1 accessed by the bidirectional excitation module 20 is transmitted to the negative terminal of the second transducer HNQ2 through the transceiver switching module 10, at this time, the positive terminal of the second transducer HNQ2 is grounded, that is, the voltage at the positive terminal is 0V, and the voltage at the negative terminal of the second transducer HNQ2 is 3.3V.
In the transducer excitation circuit provided by the embodiment of the invention, the bidirectional excitation can be realized through the bidirectional excitation module 20, and compared with the unidirectional excitation of which the negative end of the excitation transducer is grounded and pulse excitation is only applied to the positive end, the excitation is doubled through the bidirectional excitation energy, and then the ultrasonic signal received by the receiving transducer is doubled. That is, under the same noise interference condition, the excitation transducer is excited in a two-way manner, and under the condition that the excitation voltage amplitude is not increased, the excitation time can be doubled so as to realize the excitation doubling effect, and then the signal-to-noise ratio is doubled, so that the quality of an ultrasonic signal received by the receiving transducer is increased, and the error of the ultrasonic metering device is reduced.
The foregoing embodiments are exemplary of the basic principle of bi-directional excitation of the transducer excitation circuit, and the specific structures that each functional module in the circuit may have are described below by way of example, but are not limiting of the invention.
Fig. 2 is a schematic structural diagram of another transducer excitation circuit according to an embodiment of the present invention, and referring to fig. 2, the bidirectional excitation module 20 may optionally include a first excitation unit 21 and a second excitation unit 22 based on the above embodiment. The control end IN1 of the first excitation unit 21 is connected to the clock signal CLK, the first connection end NO1 of the first excitation unit 21 is connected to the first power signal V1, the second connection end NC1 of the first excitation unit 21 is connected to the second power signal V2, the public end COM1 of the first excitation unit 21 is connected to the transceiver switching module 10, and the first excitation unit 21 is used for controlling the public end COM1 of the first excitation unit 21 to be communicated with the first connection end NO1 or the second connection end NC1 of the first excitation unit 21 according to the clock signal CLK. The control end IN2 of the second excitation unit 22 is connected to the clock signal CLK, the first connection end NO2 of the second excitation unit 22 is connected to the second power signal V2, the second connection end NC2 of the second excitation unit 22 is connected to the first power signal V1, the public end COM2 of the second excitation unit 22 is connected to the transceiver switching module 10, and the second excitation unit 22 is used for controlling the public end COM2 of the second excitation unit 22 to be communicated with the first connection end NO2 or the second connection end NC2 of the second excitation unit 22 according to the clock signal CLK. In the example of fig. 2, the first power signal V1 is a dc voltage signal of 3.3V, and the second power signal V2 is a ground signal.
Specifically, when the clock signal CLK is at the first level, the common terminal COM1 of the first pumping unit 21 is controlled to be in communication with the first connection terminal NO1 of the first pumping unit 21, and the common terminal COM2 of the second pumping unit 22 is controlled to be in communication with the first connection terminal NO2 of the second pumping unit 22. When the clock signal CLK is at the second level, the common terminal COM1 of the first pumping unit 21 is controlled to communicate with the second connection terminal NC1 of the first pumping unit 21, and the common terminal COM2 of the second pumping unit 22 is controlled to communicate with the second connection terminal NC2 of the second pumping unit 22.
On the basis of the above embodiments, optionally, the first excitation unit 21 and the second excitation unit 22 each include an analog switch, so as to implement bidirectional excitation of the excitation transducer, and based on the analog switch, the common terminal of the excitation unit is controlled to be communicated with the first connection terminal or the second connection terminal according to the clock signal CLK, so that bidirectional excitation of the excitation transducer is implemented without using a discrete component of a switching tube, which can avoid the problem of substantial delay caused by high and low levels, and further improve the stability of the excitation circuit of the transducer.
Specifically, the first excitation unit 21 may include a first analog switch chip U1, and the second excitation unit 22 may include a second analog switch chip U2. The first analog switch chip U1 and the second analog switch chip U2 each comprise a control end, a common end, a normal open end and a normal closed end. Specifically, the control end of the first analog switch chip U1 is used as the control end IN1 of the first excitation unit 21, the common end of the first analog switch chip U1 is used as the common end COM1 of the first excitation unit 21, the normally open end of the first analog switch chip U1 is used as the first connection end NO1 of the first excitation unit 21, and the normally closed end of the first analog switch chip U1 is used as the second connection end NC1 of the first excitation unit 21. The control end of the second analog switch chip U2 is used as the control end IN2 of the second excitation unit 22, the common end of the second analog switch chip U2 is used as the common end COM2 of the second excitation unit 22, the normally open end of the second analog switch chip U2 is used as the first connection end NO2 of the second excitation unit 22, and the normally closed end of the second analog switch chip U2 is used as the second connection end NC2 of the second excitation unit 22.
With continued reference to fig. 2, taking the first level as a high level and the second level as a low level, the first transducer HNQ1 as an excitation transducer, waveforms of clock signals and signal waveforms respectively received by the positive terminal and the negative terminal of the first transducer are shown in fig. 2, and it can be seen that the transducer excitation circuit can implement bidirectional excitation for the excitation transducer.
Fig. 3 is a schematic structural diagram of another transducer excitation circuit according to an embodiment of the present invention, and referring to fig. 3, the transceiver switching module 10 optionally includes a transceiver switching sub-module 11, a voltage control unit 12, and a signal transmission unit 13 based on the above embodiments.
The transceiver-switch sub-module 11 is respectively connected to the common terminal COM1 of the first excitation unit 21, the common terminal COM2 of the second excitation unit 22, the positive terminal of the first transducer HNQ1, the negative terminal of the first transducer HNQ1, the positive terminal of the second transducer HNQ2, and the negative terminal of the second transducer HNQ2, and is connected to the switching control signal hnq_cs, the transceiver-switch sub-module 11 is configured to transmit the signal of the common terminal COM1 of the first excitation unit 21 to the positive terminal of the first transducer HNQ1 and the signal of the common terminal COM2 of the second excitation unit 22 to the negative terminal of the first transducer HNQ1 when the switching control signal hnq_cs is at the first level, and the transceiver-switch sub-module 11 is configured to transmit the signal of the common terminal COM1 of the first excitation unit 21 to the positive terminal of the second transducer HNQ2 and the signal of the common terminal COM2 of the second excitation unit 22 to the negative terminal of the second transducer HNQ2 when the switching control signal hnq_cs is at the second level.
The control end IN5 of the voltage control unit 12 is connected to the switching control signal HNQ_CS, the public end COM5 of the voltage control unit 12 is grounded, the first connection end NO5 of the voltage control unit 12 is connected with the negative end of the second energy converter HNQ2, the second connection end NC5 of the voltage control unit 12 is connected with the negative end of the first energy converter HNQ1, and the voltage control unit 12 is used for controlling the public end COM5 of the voltage control unit 12 to be communicated with the first connection end NO5 or the second connection end NC5 of the voltage control unit 12 according to the switching control signal HNQ_CS. When the switching control signal hnq_cs is at the first level, the common terminal COM5 of the voltage control unit 12 is connected to the first connection terminal NO5 of the voltage control unit 12, and when the switching control signal hnq_cs is at the second level, the common terminal COM5 of the voltage control unit 12 is connected to the second connection terminal NC5 of the voltage control unit 12.
The control end IN6 of the signal transmission unit 13 is connected to the switching control signal HNQ_CS, the public end COM6 of the signal transmission unit 13 is used for outputting an ultrasonic echo electric signal SG_OUT1 output by the receiving transducer, the first connecting end NO6 of the signal transmission unit 13 is connected with the positive end of the second transducer HNQ2, the second connecting end NC6 of the signal transmission unit 13 is connected with the positive end of the first transducer HNQ1, and the signal transmission unit 13 is used for controlling the public end COM6 of the signal transmission unit 13 to be communicated with the first connecting end NO6 or the second connecting end NC6 of the signal transmission unit 13 according to the switching control signal HNQ_CS. When the switching control signal hnq_cs is at the first level, the common terminal COM6 of the signal transmission unit 13 is connected to the first connection terminal NO6 of the signal transmission unit 13, and when the switching control signal hnq_cs is at the second level, the common terminal COM6 of the signal transmission unit 13 is connected to the second connection terminal NC6 of the signal transmission unit 13.
Specifically, when the switching control signal hnq_cs is at the first level, the transceiver switching sub-module 11 controls the first transducer HNQ1 to be an excitation transducer, and the second transducer HNQ2 to be a receiving transducer, and transmits the signal of the common terminal COM1 of the first excitation unit 21 and the signal of the common terminal COM2 of the second excitation unit 22 to the positive terminal and the negative terminal of the first transducer HNQ1, respectively. And the voltage control unit 12 controls the common terminal COM5 thereof to communicate with the first connection terminal NO5 thereof in response to the switching control signal hnq_cs so that the negative terminal of the second transducer HNQ2 is grounded, and the signal transmission unit 13 controls the common terminal COM6 thereof to communicate with the first connection terminal NO6 thereof in response to the switching control signal hnq_cs so that the second transducer HNQ2 outputs the ultrasonic electric signal sg_out1 through the common terminal COM6 of the signal transmission unit 13.
When the switching control signal hnq_cs is at the second level, the transceiver switching sub-module 11 controls the first transducer HNQ1 to be a receiving transducer, and the second transducer HNQ2 to be an exciting transducer, and transmits the signal of the common terminal COM1 of the first exciting unit 21 and the signal of the common terminal COM2 of the second exciting unit 22 to the positive terminal and the negative terminal of the second transducer HNQ2, respectively. And the voltage control unit 12 controls the common terminal COM5 thereof to communicate with the second connection terminal NC5 thereof in response to the switching control signal hnq_cs, thereby causing the negative terminal of the first transducer HNQ1 to be grounded, and the signal transmission unit 13 controls the common terminal COM6 thereof to communicate with the second connection terminal NC6 thereof in response to the switching control signal hnq_cs, thereby causing the first transducer HNQ1 to output the ultrasonic electric signal sg_out1 to be output through the common terminal COM6 of the signal transmission unit 13.
Fig. 4 is a schematic structural diagram of another transducer excitation circuit according to an embodiment of the present invention, and referring to fig. 4, optionally, the transceiver switching sub-module 11 includes a first switching unit 101 and a second switching unit 102 based on the above embodiments. The control terminal IN3 of the first switching unit 101 is connected to the switching control signal HNQ_CS, the common terminal COM3 of the first switching unit 101 is connected to the common terminal COM1 of the first excitation unit 21, the first connection terminal NO3 of the first switching unit 101 is connected to the positive terminal of the first transducer HNQ1, the second connection terminal NC3 of the first switching unit 101 is connected to the positive terminal of the second transducer HNQ2, and the first switching unit 101 is used for controlling the common terminal COM3 of the first switching unit 101 to be communicated with the first connection terminal NO3 or the second connection terminal NC3 of the first switching unit 101 according to the switching control signal HNQ_CS. The control terminal IN4 of the second switching unit 102 is connected to the switching control signal hnq_cs, the common terminal COM4 of the second switching unit 102 is connected to the common terminal COM2 of the second excitation unit 22, the first connection terminal NO4 of the second switching unit 102 is connected to the negative terminal of the first transducer HNQ1, the second connection terminal NC4 of the second switching unit 102 is connected to the negative terminal of the second transducer HNQ2, and the second switching unit 102 is configured to control the common terminal COM4 of the second switching unit 102 to communicate with the first connection terminal NO4 or the second connection terminal NC4 of the second switching unit 102 according to the switching control signal hnq_cs.
When the switching control signal hnq_cs is at the first level, the common terminal COM3 of the first switching unit 101 is connected to the first connection terminal NO3, the common terminal COM4 of the second switching unit 102 is connected to the first connection terminal NO4, the signal of the common terminal COM1 of the first excitation unit 21 is transmitted to the positive terminal of the first transducer HNQ1, and the signal of the common terminal COM2 of the second excitation unit 22 is transmitted to the negative terminal of the first transducer HNQ 1. And when the switching control signal hnq_cs is at the second level, the common terminal COM3 of the first switching unit 101 is connected to the second connection terminal NC3 thereof, the common terminal COM4 of the second switching unit 102 is connected to the second connection terminal NC4 thereof, the signal of the common terminal COM1 of the first excitation unit 21 is transmitted to the positive terminal of the second transducer HNQ2, and the signal of the common terminal COM2 of the second excitation unit 22 is transmitted to the negative terminal of the second transducer HNQ 2.
With continued reference to fig. 4, on the basis of the above embodiments, optionally, the voltage control unit 12, the signal transmission unit 13, the first switching unit 101 and the second switching unit 102 each include an analog switch chip, which can reduce the frequency limitation on the excitation circuit, reduce the delay, and enlarge the application scenario of the transducer compared to the implementation using a transistor discrete element or the implementation using an H-bridge dedicated circuit.
Specifically, the first switching unit 101 includes a third analog switch chip U3, the second switching unit 102 includes a fourth analog switch chip U4, the voltage control unit 12 includes a fifth analog switch chip U5, and the signal transmission unit 13 includes a sixth analog switch chip U6. Each analog switch chip comprises a control end, a common end, a normal open end and a normal closed end. Specifically, the control end of each analog switch chip is used as the control end of the corresponding unit, the common end of each analog switch chip is used as the common end of the corresponding unit, the normal open end of each analog switch chip is used as the first connection end of the corresponding unit, and the normal closed end of each analog switch chip is used as the second connection end of the corresponding unit.
Optionally, in the transducer excitation circuit, each analog switch chip further includes a power supply terminal and a ground terminal. The power supply end of each analog switch chip is connected with a power supply signal (for example, 3.3V direct current voltage signal), the grounding end of each analog switch chip is grounded to provide the power supply voltage required by the normal operation of each analog switch chip, and the power supply end of each analog switch chip can be connected with a filter capacitor to ensure the power supply stability. Specifically, the capacitor C1 is connected between the power end and the ground end of the first analog switch chip U1, the capacitor C2 is connected between the power end and the ground end of the second analog switch chip U2, the capacitor C3 is connected between the power end and the ground end of the third analog switch chip U3, the capacitor C4 is connected between the power end and the ground end of the fourth analog switch chip U4, the capacitor C5 is connected between the power end and the ground end of the fifth analog switch chip U5, and the capacitor C6 is connected between the power end and the ground end of the sixth analog switch chip U6.
The specific operation principle of the transducer excitation circuit provided by the embodiment of the present invention is described in detail below with reference to fig. 4.
Specifically, when the switching control signal hnq_cs is at a high level, the first analog switch chip U1 and the second analog switch chip U2 select the first transducer HNQ1 as an excitation transducer, and the second transducer HNQ2 as a receiving transducer. The third analog switch chip U3 responds to the switching control signal HNQ_CS to control the common end of the third analog switch chip U3 to be communicated with the normally open end of the third analog switch chip U3, and the fourth analog switch chip U4 responds to the switching control signal HNQ_CS to control the common end of the fourth analog switch chip U4 to be communicated with the normally open end of the fourth analog switch chip U4. When the clock signal CLK is at a high level, the first analog switch chip U1 responds to the clock signal CLK to control the common terminal of the first analog switch chip U1 to communicate with the normally open terminal of the first analog switch chip U1, and the second analog switch chip U2 responds to the clock signal CLK to control the common terminal of the second analog switch chip U2 to communicate with the normally open terminal of the second analog switch chip U2, so that the normally open terminal of the first analog switch chip U1 is connected to the positive terminal of the first transducer HNQ1 through the normally open terminal of the third analog switch chip U3, and the normally open terminal of the second analog switch chip U2 is connected to the negative terminal of the second power signal V2 through the normally open terminal of the fourth analog switch chip U4. At this time, the positive terminal voltage of the first transducer HNQ1 is 3.3V, and the negative terminal voltage of the first transducer HNQ1 is 0V. Here, since the first power signal V1 is 3.3V, the second power signal V2 is 0V, and the clock signal CLK is at a high level, the common terminal of the first analog switch chip U1 may be considered as an in-phase excitation signal of the clock signal CLK, and correspondingly, the common terminal of the second analog switch chip U2 may be considered as an opposite-phase excitation signal of the clock signal CLK. When the clock signal CLK is at a low level, the in-phase excitation signal transmitted from the common terminal of the first analog switch chip U1 is transmitted to the positive terminal of the first transducer HNQ1 through the normally open terminal of the third analog switch chip U3, and the anti-phase excitation signal transmitted from the common terminal of the second analog switch chip U2 is transmitted to the negative terminal of the first transducer HNQ1 through the normally open terminal of the fourth analog switch chip U4. At this time, the positive terminal voltage of the first transducer HNQ1 is 0V, and the negative terminal voltage of the first transducer HNQ1 is 3.3V. At this time, the first transducer HNQ1 has excitation signals at both positive and negative terminals, corresponding to double the excitation. Meanwhile, the fifth analog switch chip U5 responds to the switching control signal hnq_cs to control the common terminal of the fifth analog switch chip U5 to communicate with the normally open terminal of the fifth analog switch chip U5, the sixth analog switch chip U6 responds to the switching control signal hnq_cs to control the common terminal of the sixth analog switch chip U6 to communicate with the normally open terminal of the sixth analog switch chip U6, the negative terminal of the second transducer HNQ2 is grounded, and the second transducer HNQ2 outputs the ultrasonic electric signal sg_out1 to be output through the common terminal of the sixth analog switch chip U6.
When the switching control signal hnq_cs is at a low level, the first analog switch chip U1 and the second analog switch chip U2 select the first transducer HNQ1 as a receiving transducer and the second transducer HNQ2 as an excitation transducer. The third analog switch chip U3 responds to the switching control signal hnq_cs to control the common terminal of the third analog switch chip U3 to communicate with the normally closed terminal of the third analog switch chip U3, and the fourth analog switch chip U4 responds to the switching control signal hnq_cs to control the common terminal of the fourth analog switch chip U4 to communicate with the normally closed terminal of the fourth analog switch chip U4. When the clock signal CLK is at a high level, the first analog switch chip U1 controls the common terminal of the first analog switch chip U1 to communicate with the normally open terminal of the first analog switch chip U1 in response to the clock signal CLK, and the second analog switch chip U2 controls the common terminal of the second analog switch chip U2 to communicate with the normally open terminal of the second analog switch chip U2 in response to the clock signal CLK. The first power signal V1 connected to the normal open end of the first analog switch chip U1 is transmitted to the positive end of the second transducer HNQ2 through the normal closed end of the third analog switch chip U3, and the second power signal V2 connected to the normal open end of the second analog switch chip U2 is transmitted to the negative end of the second transducer HNQ2 through the normal closed end of the fourth analog switch chip U4. That is, the in-phase excitation signal transmitted from the common terminal of the first analog switch chip U1 is transmitted to the positive terminal of the second transducer HNQ2 through the normally closed terminal of the third analog switch chip U3, and the anti-phase excitation signal transmitted from the common terminal of the second analog switch chip U2 is transmitted to the negative terminal of the second transducer HNQ2 through the normally closed terminal of the fourth analog switch chip U4. At this time, the positive terminal voltage of the second transducer HNQ2 is 3.3V, and the negative terminal voltage of the second transducer HNQ2 is 0V. When the clock signal CLK is at a low level, the in-phase excitation signal transmitted from the common terminal of the first analog switch chip U1 is transmitted to the positive terminal of the second transducer HNQ2 through the normally closed terminal of the third analog switch chip U3, and the anti-phase excitation signal transmitted from the common terminal of the second analog switch chip U2 is transmitted to the negative terminal of the second transducer HNQ2 through the normally closed terminal of the fourth analog switch chip U4. At this time, the positive terminal voltage of the second transducer HNQ2 is 0V, and the negative terminal voltage of the second transducer HNQ2 is 3.3V. At this time, the second transducer HNQ2 has excitation signals at both the positive and negative terminals, corresponding to double the excitation. Meanwhile, the fifth analog switch chip U5 controls the common terminal of the fifth analog switch chip U5 to communicate with the normally-closed terminal of the fifth analog switch chip U5 in response to the switching control signal hnq_cs, the sixth analog switch chip U6 controls the common terminal of the sixth analog switch chip U6 to communicate with the normally-closed terminal of the sixth analog switch chip U6 in response to the switching control signal hnq_cs, the negative terminal of the first transducer HNQ1 is grounded, and the first transducer HNQ1 outputs the ultrasonic electric signal sg_out1 through the common terminal of the sixth analog switch chip U6.
According to the technical scheme, the two-way excitation of the excitation transducer is realized by arranging the plurality of analog switches, the two-way excitation of the excitation transducer is realized without using a discrete component of the switching tube, the structure is simpler, the number of used components is small, the switching speed is high, the delay is small, and the problem of large delay in the process of switching high and low levels can be avoided, so that the stability of the excitation circuit of the transducer is improved.
The embodiment of the invention also provides an ultrasonic metering device which comprises the transducer excitation circuit provided by any embodiment, so that the ultrasonic metering device has corresponding beneficial effects. Fig. 5 is a schematic structural diagram of an ultrasonic measuring device according to an embodiment of the present invention, and referring to fig. 5, the ultrasonic measuring device includes a first transducer HNQ1, a second transducer HNQ2, and a transducer excitation circuit.
Further, the ultrasonic metering device further comprises an amplifying circuit 30, wherein the input end of the amplifying circuit 30 is connected with the receiving and transmitting switching module 10, the receiving and transmitting switching module 10 is used for transmitting an ultrasonic echo electric signal SG_OUT1 output by the receiving transducer to the input end of the amplifying circuit 30, and the amplifying circuit 30 is used for amplifying the ultrasonic echo electric signal SG_OUT1 to obtain an amplified echo signal SG_OUT and outputting the amplified echo electric signal SG_OUT1.
The amplifying circuit 30 may include resistors R1 to R4, capacitors C7 to C8, and an operational amplifier U7, for example, but is not limited to this embodiment. Specifically, the first end of the capacitor C8 is connected to the transceiver switching module 10, the second end of the capacitor C8 is connected to the first input end of the operational amplifier U7 and to the first end of the resistor R3, the second end of the resistor R3 is connected to the first end of the resistor R4 and the first end of the resistor R5, respectively, the second end of the resistor R4 is grounded, the second end of the resistor R5 is connected to a 3.3V dc voltage, the first end of the resistor R1 is connected to the first end of the capacitor C7, the second end of the capacitor C7 is grounded, the second end of the resistor R1 is connected to the first end of the resistor R2 and to the second input end of the operational amplifier U7, the second end of the resistor R2 is connected to the output end of the operational amplifier U7, and the first power supply end of the operational amplifier U7 is connected to a 3.3V dc voltage.
On the basis of the above embodiments, the ultrasonic measuring device optionally further includes a control module 40, where the control module 40 is respectively connected to the output ends of the transceiver switching module 10, the bidirectional excitation module 20 and the amplifying circuit 30, and the control module 40 is used as a core data processing unit in the ultrasonic measuring device and can be used to output the switching control signal hnq_cs and the clock signal CLK and process the amplified echo signal sg_out.
The embodiment of the invention also provides an ultrasonic gas meter, which comprises the ultrasonic metering device provided by any embodiment, so that the ultrasonic gas meter has corresponding beneficial effects.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411974093.8A CN119549382A (en) | 2024-12-30 | 2024-12-30 | Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411974093.8A CN119549382A (en) | 2024-12-30 | 2024-12-30 | Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119549382A true CN119549382A (en) | 2025-03-04 |
Family
ID=94738387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411974093.8A Pending CN119549382A (en) | 2024-12-30 | 2024-12-30 | Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119549382A (en) |
-
2024
- 2024-12-30 CN CN202411974093.8A patent/CN119549382A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0681684B1 (en) | Fluid flow meter | |
| US20070106159A1 (en) | Ultrasonic probe and ultrasonic diagnostic apparatus | |
| CN102841327A (en) | Transmitting device, power-amplifier unit and method for generating target signal | |
| CN119549382A (en) | Transducer excitation circuit, ultrasonic measuring device and ultrasonic gas meter | |
| CN201681157U (en) | Multi-probe multibeam echosounder | |
| CN103115561B (en) | Cable length testing device and method | |
| Hagon et al. | A Programmable Surface Acoustic Wave Matched Filter for Phase-Coded Spread Spectrum Waveforms (Short Papers) | |
| CN105283778A (en) | Ultrasonic transmission and reception apparatus | |
| Caliano et al. | Biasing of capacitive micromachined ultrasonic transducers | |
| JPH06194197A (en) | Operating circuit for ultrasonic wave flowmeter | |
| CN212514870U (en) | Low-voltage signal source | |
| JP2004057477A (en) | Ultrasonic diagnostic instrument | |
| CN103929160B (en) | Measuring instrument with clock driver circuit | |
| SU1271585A1 (en) | Ultrasonic generator | |
| US20060152275A1 (en) | Signal transmitting circuit | |
| CN222053042U (en) | Multi-channel communication selection output circuit | |
| CN108323227B (en) | Infrared receiver and infrared simultaneous interpretation system | |
| CN219695748U (en) | Data processing circuit and wind speed detection device | |
| JP2008073137A (en) | Ultrasonic diagnostic equipment and ultrasonic probe | |
| CN219643893U (en) | Driving circuit | |
| RU2104498C1 (en) | Ultrasonic frequency-pulse method of measurement of flow rate and device for its implementation | |
| CN215812546U (en) | Frequency sweep driving circuit for detecting bonding strength of chemical embedded steel bar | |
| CN113533818B (en) | Dynamic unbalanced bridge detection circuit based on active vibration reduction network | |
| CN113326909B (en) | RFID dynamic monitoring system and time-staggered, difference frequency and cross test measuring method | |
| CN211027332U (en) | Ultrasonic wireless driving device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |