CN210780684U - Signal transmitting circuit of ultrasonic flowmeter - Google Patents
Signal transmitting circuit of ultrasonic flowmeter Download PDFInfo
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- CN210780684U CN210780684U CN201922406573.5U CN201922406573U CN210780684U CN 210780684 U CN210780684 U CN 210780684U CN 201922406573 U CN201922406573 U CN 201922406573U CN 210780684 U CN210780684 U CN 210780684U
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Abstract
The utility model discloses a signal transmitting circuit for an ultrasonic flowmeter, which comprises a first switch tube, a second switch tube, an inductor L and a capacitor C; the control end of the first switch tube is connected with the control signal end, the input end of the first switch tube is connected with the direct-current power supply, and the output end of the first switch tube is connected with one end of the inductor L; the control end of the second switch tube is connected with the signal transmitting end, the input end of the second switch tube is connected with the other end of the inductor L, and the output end of the second switch tube is grounded; one end of the capacitor C is connected with the output end of the first switch tube, and the other end of the capacitor C is grounded; one end of the ultrasonic transducer for sending and receiving ultrasonic signals is connected with the input end of the second switch tube, and the other end of the ultrasonic transducer is grounded. The utility model discloses an ultrasonic flowmeter's signal transmission circuit, circuit structure use passive device to build, and is with low costs, and the voltage conversion rate of signal is high, consumption when can effectively reduce the transmitting signal.
Description
Technical Field
The utility model relates to an supersound measurement technical field, concretely relates to ultrasonic flowmeter's signal transmission circuit.
Background
An ultrasonic flowmeter uses an ultrasonic transducer (piezoelectric ceramic plate) as a sensor component of a core for transmission and reception of ultrasonic signals. The electroacoustic conversion efficiency of the ultrasonic transducer to signals is different along with the different densities of the measured media. Particularly, in the ultrasonic gas meter, since the medium density is extremely low, the signal received by the receiving end is usually very weak, and therefore, the transmitting end is required to increase the transmitting voltage so that the receiving end can receive the signal as much as possible. In the prior art, a power supply voltage of a transmitting circuit is generally increased by using a boosting circuit, or a voltage of a transmitting signal is increased by using a transformer. However, due to the influence of factors such as conversion efficiency, device loss, response time and the like, the technologies have large power consumption, many components and high cost, and cannot meet the requirements of low power consumption and low cost for meter design.
Disclosure of Invention
The utility model provides an ultrasonic flowmeter's signal transmission circuit, circuit structure use passive device to build, and is with low costs, and the voltage conversion rate of signal is high, consumption when can effectively reduce the transmitting signal.
In order to solve the technical problem, the utility model provides a signal transmitting circuit for an ultrasonic flowmeter, which comprises a first switch tube, a second switch tube, an inductor L and a capacitor C; the control end of the first switch tube is connected with the control signal end, the input end of the first switch tube is connected with the direct-current power supply, and the output end of the first switch tube is connected with one end of the inductor L; the control end of the second switch tube is connected with the signal transmitting end, the input end of the second switch tube is connected with the other end of the inductor L, and the output end of the second switch tube is grounded; one end of the capacitor C is connected with the output end of the first switch tube, and the other end of the capacitor C is grounded; one end of the ultrasonic transducer for sending and receiving ultrasonic signals is connected with the input end of the second switch tube, and the other end of the ultrasonic transducer is grounded.
In a preferred embodiment of the present invention, the first switch transistor is a transistor Q1, the base of the transistor Q1 is connected to the control signal terminal, the emitter thereof is connected to the dc power supply, and the collector thereof is connected to the inductor L and the capacitor C; the second switch tube is a triode Q2, the collector of the triode Q2 is connected with an inductor L, the base of the triode Q2 is connected with a signal transmitting end, and the emitter of the triode Q is grounded.
In a preferred embodiment of the present invention, the transistor Q1 is a PNP transistor, and the transistor Q2 is an NPN transistor.
In a preferred embodiment of the present invention, the first switch transistor is a FET1, the source of the FET1 is connected to a dc power supply, the gate thereof is connected to a control signal terminal, and the drain thereof is connected to an inductor L and a capacitor C; the second switch tube is a field effect transistor FET2, the drain of the field effect transistor FET2 is connected to the inductor L, the gate thereof is connected to the signal transmitting terminal, and the source thereof is grounded.
In a preferred embodiment of the present invention, further comprising the FET1 is a P-channel FET and the FET2 is an N-channel FET.
The utility model discloses a preferred embodiment, further include that it still includes resistance R, resistance R's one end connect switch tube one's output, and inductance L and electric capacity C are connected to its other end.
The utility model has the advantages that:
the utility model discloses an ultrasonic flowmeter's signal transmission circuit, when the signal control switch tube Q2 switch action that signal transmission end need launch, with the help of inductance L's induced voltage characteristic, will obtain the voltage signal that risees to load on ultrasonic transducer. The whole circuit structure is built by using passive devices, the cost is low, the voltage conversion rate of signals is high, the transmitting signals with the amplitude of at least 2 times of that of a direct-current power supply can be obtained under the general condition (higher transmitting voltage can be obtained by increasing the inductance L), and the cost is reduced by at least 50% compared with other boosting transmitting circuits (such as DC-DC, transformers and the like) with the same effect; in addition, because no additional conversion circuit (such as DC-DC, transformer and the like) is arranged, the power consumption of the transmission signal can be effectively reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a signal transmitting circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a signal transmitting circuit according to a second embodiment of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Examples
The embodiment discloses a signal transmitting circuit for an ultrasonic flowmeter, which is shown in fig. 1-2 and comprises a first switching tube, a second switching tube, an inductor L and a capacitor C; the control end of the first switch tube is connected with a control signal end, a power supply control signal S1 is connected to the control end of the first switch tube, the input end of the first switch tube is connected with a direct-current power supply VCC, and the output end of the first switch tube is connected with one end of an inductor L; the control end of the second switch tube is connected with a signal transmitting end, a signal S2 to be transmitted is connected to the control end of the second switch tube, the input end of the second switch tube is connected with the other end of the inductor L, and the output end of the second switch tube is grounded; one end of the capacitor C is connected with the output end of the first switch tube, and the other end of the capacitor C is grounded; one end of an ultrasonic transducer T for sending and receiving ultrasonic signals is connected with the input end of the second switch tube, and the other end of the ultrasonic transducer T is grounded.
When the signal S2 needs to be transmitted, the first switch tube is turned on by the power control signal S1, then the signal S2 needs to be transmitted is input into the second switch tube, and when the signal needs to be transmitted controls the switch action of the Q2, the boosted voltage signal is obtained by the induced voltage characteristic of the inductor L and is loaded on the ultrasonic transducer T. The whole circuit structure is built by using passive devices, the cost is low, the voltage conversion rate of signals is high, the transmitting signals with the amplitude of at least 2 times of that of a direct-current power supply can be obtained under the general condition (higher transmitting voltage can be obtained by increasing the inductance L), and the cost is reduced by at least 50% compared with other boosting transmitting circuits (such as DC-DC, transformers and the like) with the same effect; in addition, because no additional conversion circuit (such as DC-DC, transformer and the like) is arranged, the power consumption of the transmission signal can be effectively reduced.
As a first embodiment of the present application, referring to fig. 1, the first switching tube is a PNP transistor Q1, a base of the transistor Q1 is connected to a control signal terminal, an emitter thereof is connected to a dc power supply, and a collector thereof is connected to an inductor L and a capacitor C; the second switch tube is an NPN-type triode Q2, the collector of the triode Q2 is connected to the inductor L, the base thereof is connected to the signal emitting terminal, and the emitter thereof is grounded.
As a second embodiment of the present application, referring to fig. 2, the first switching transistor is a P-channel FET1, the source of the FET1 is connected to a dc power source VCC, the gate thereof is connected to a control signal terminal, and the drain thereof is connected to an inductor L and a capacitor C; the second switch transistor is an N-channel FET2, the drain of the FET2 is connected to an inductor L, the gate thereof is connected to a signal transmitting terminal, and the source thereof is grounded.
In order to adjust the loop current, the signal transmitting circuit further comprises a resistor R, one end of the resistor R is connected with the output end of the first switch tube, and the other end of the resistor R is connected with the inductor L and the capacitor C. The resistor R is a current-limiting resistor, and the resistance value can be adjusted according to the actual situation, wherein R is 0 ohm.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (6)
1. A signal transmitting circuit of an ultrasonic flow meter, characterized by: the circuit comprises a first switching tube, a second switching tube, an inductor L and a capacitor C; the control end of the first switch tube is connected with the control signal end, the input end of the first switch tube is connected with the direct-current power supply, and the output end of the first switch tube is connected with one end of the inductor L; the control end of the second switch tube is connected with the signal transmitting end, the input end of the second switch tube is connected with the other end of the inductor L, and the output end of the second switch tube is grounded; one end of the capacitor C is connected with the output end of the first switch tube, and the other end of the capacitor C is grounded; one end of the ultrasonic transducer for sending and receiving ultrasonic signals is connected with the input end of the second switch tube, and the other end of the ultrasonic transducer is grounded.
2. The signal transmitting circuit of an ultrasonic flow meter according to claim 1, wherein: the first switch tube is a triode Q1, the base electrode of the triode Q1 is connected with a control signal end, the emitting electrode of the triode Q1 is connected with a direct-current power supply, and the collecting electrode of the triode Q1 is connected with an inductor L and a capacitor C; the second switch tube is a triode Q2, the collector of the triode Q2 is connected with an inductor L, the base of the triode Q2 is connected with a signal transmitting end, and the emitter of the triode Q is grounded.
3. A signal transmitting circuit for an ultrasonic flow meter according to claim 2, wherein: the triode Q1 is a PNP type triode, and the triode Q2 is an NPN type triode.
4. The signal transmitting circuit of an ultrasonic flow meter according to claim 1, wherein: the first switch tube is a field effect transistor FET1, the source electrode of the field effect transistor FET1 is connected with a direct current power supply, the grid electrode of the field effect transistor FET1 is connected with a control signal end, and the drain electrode of the field effect transistor FET1 is connected with an inductor L and a capacitor C; the second switch tube is a field effect transistor FET2, the drain of the field effect transistor FET2 is connected to the inductor L, the gate thereof is connected to the signal transmitting terminal, and the source thereof is grounded.
5. The signal transmitting circuit of an ultrasonic flow meter according to claim 4, wherein: the FET1 is a P-channel FET, and the FET2 is an N-channel FET.
6. The signal transmitting circuit of an ultrasonic flow meter according to claim 2 or 4, characterized in that: the circuit further comprises a resistor R, one end of the resistor R is connected with the output end of the first switch tube, and the other end of the resistor R is connected with the inductor L and the capacitor C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922406573.5U CN210780684U (en) | 2019-12-27 | 2019-12-27 | Signal transmitting circuit of ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922406573.5U CN210780684U (en) | 2019-12-27 | 2019-12-27 | Signal transmitting circuit of ultrasonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210780684U true CN210780684U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922406573.5U Active CN210780684U (en) | 2019-12-27 | 2019-12-27 | Signal transmitting circuit of ultrasonic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210780684U (en) |
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2019
- 2019-12-27 CN CN201922406573.5U patent/CN210780684U/en active Active
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