CN213305378U - Flowmeter pulse output circuit - Google Patents
Flowmeter pulse output circuit Download PDFInfo
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- CN213305378U CN213305378U CN202022171185.6U CN202022171185U CN213305378U CN 213305378 U CN213305378 U CN 213305378U CN 202022171185 U CN202022171185 U CN 202022171185U CN 213305378 U CN213305378 U CN 213305378U
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Abstract
The utility model provides a flowmeter pulse output circuit, include: the device comprises a first shaping unit, a signal selection unit, a processor, an isolation unit and a pulse output unit; the input end of the first shaping unit is connected with the output end of an external flow sensor and used for receiving an original pulse signal, the output end of the first shaping unit is connected with the input end of the signal selection unit, the input end of the signal selection unit is also connected with the output end of the processor, the output end of the signal selection unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the pulse output unit. The utility model adds a path of corrected pulse signal, and flexibly realizes the selection of an input signal source through a multi-way switch, thereby realizing the pulse signal output of the flowmeter and the automatic electronic correction of the flowmeter; the isolation unit is additionally arranged to isolate internal and external signals, so that interference of an external power supply to an internal circuit is avoided, and the output precision of pulse signals is improved.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a flowmeter pulse output circuit.
Background
The flow meter can use the function of pulse output during regular verification before or after leaving a factory, the pulse output is the basic function of most liquid flowmeters and gas flowmeters, and the pulse output of the flowmeters is used for detecting meter coefficients, verification precision errors and repeatability errors of the flowmeters. The meter factor is the number of pulses emitted by the meter per volume of fluid passing through the meter, typically in pulses/L (pulses per liter) or pulses/m 3 (pulses per cubic meter). The precision error is the error of the meter coefficient of each flow point in one detection to the meter coefficient of the flowmeter, and the repeatability is the difference percentage of the pulse quantity output in the same time when the same flow point is measured twice.
The output pulse of the existing similar product is only output after the original pulse is amplified, when the flowmeter is verified, if the accuracy error exceeds the allowed maximum error, the output pulse can be corrected only in a mechanical mode, and the effective correction cannot be performed through a circuit, but the mechanical mode is that the correction accuracy of a correction method can meet the requirement after being corrected for many times, so that the adjustment time is longer; in addition, the external power source has a large interference to the internal circuit, which can increase the measurement error and repeatability of the output pulse, and cause the problem of reducing the precision of the output signal.
Disclosure of Invention
In view of the above prior art's shortcoming, the utility model aims to provide a flowmeter pulse output circuit for the flowmeter of solving among the prior art can only take mechanical mode to revise, leads to the adjustment time long, and external power source can disturb output pulse, makes measuring error and repeatability grow, causes the problem that the output signal precision reduces.
To achieve the above and other related objects, the present invention provides a flowmeter pulse output circuit, including: the device comprises a first shaping unit, a signal selection unit, a processor, an isolation unit and a pulse output unit;
the input end of the first shaping unit is connected with the output end of an external flow sensor and used for receiving an original pulse signal, the output end of the first shaping unit is connected with the input end of the signal selection unit, the input end of the signal selection unit is also connected with the output end of the processor, the output end of the signal selection unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the pulse output unit.
In an embodiment of the present invention, the first shaping unit includes a schmitt trigger.
In an embodiment of the present invention, the signal selecting unit includes a multi-way selecting switch, the selecting terminal and a signal input terminal of the multi-way selecting switch are respectively connected to the output terminal of the processor, and another signal input terminal is connected to the output terminal of the first shaping unit.
In an embodiment of the present invention, the isolation unit includes an optocoupler G1, a transistor Q1, and a plurality of resistors;
resistance R1's one end with the output of signal selection unit is connected, and the other end is connected with triode Q1's base, triode Q1's emitter ground, and the collecting electrode is connected with opto-coupler G1's negative pole, and opto-coupler G1's positive pole passes through resistance R2 and is connected with first voltage, and opto-coupler G1's power end is connected with second voltage, and opto-coupler G1's collecting electrode passes through resistance R3 and is connected with second voltage, and opto-coupler G1's emitter is as the output of isolation unit, with pulse output unit's input is connected.
In an embodiment of the present invention, the pulse output unit includes a transistor Q2, a bidirectional diode D1, a resistor R4, and a resistor R5;
the base electrode of the triode Q2 is connected with the output end of the isolation unit, the emitter electrode is grounded, the collector electrode is respectively connected with one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R4 is connected with the third voltage, the other end of the resistor R5 is connected with one end of the bidirectional diode D1, the other end of the bidirectional diode D1 is grounded, and the other end of the resistor R5 is also used as the output end of the pulse output unit to output pulse signals.
In an embodiment of the present invention, the circuit further includes a second shaping unit, and the second shaping unit is connected in series between the signal selecting unit and the isolating unit.
In an embodiment of the present invention, the second shaping unit includes a schmitt trigger.
As above, the utility model discloses a flowmeter pulse output circuit has increased the pulse signal after the correction all the way on current original pulse signal basis, when the pulse signal is revised to needs, switches two way signals through the signal selection unit, outputs the pulse signal after revising to realize the correction of signal. The signal selection unit can flexibly realize the switching between the correction scene and the normal use scene, thereby realizing the pulse signal output of the flowmeter and the automatic electronic correction of the flowmeter. In addition, the isolation unit is additionally arranged to isolate internal and external signals, so that interference of an external power supply to an internal circuit is avoided, and the output precision of the pulse signal is improved. The utility model relates to a rationally, have higher economic benefits and social.
Drawings
Fig. 1 shows a block diagram of the overall structure disclosed in the embodiment of the present invention.
Fig. 2 is a schematic diagram of the wiring disclosed in the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
Referring to fig. 1, the present invention provides a flowmeter pulse output circuit, including: the device comprises a first shaping unit, a signal selection unit, a processor, an isolation unit and a pulse output unit.
Referring to fig. 2, the input end of the first shaping unit is connected to an original pulse signal output by an external flow sensor, and filters out clutter with a smaller amplitude in the original pulse signal, and simultaneously processes an irregular pulse signal into a square pulse. In this embodiment, the first shaping unit employs a schmitt trigger U1 with a model number HEF 4093.
The signal selection unit is used for selecting an input signal source, in this embodiment, the signal selection unit adopts a multi-way selection switch U2 with a model of CD4051, and in this embodiment, the model of the single chip microcomputer of the processor is MSP 430F 415.
The eleventh pin and the tenth pin of the multiplexer U2 are two selection terminals connected to the output terminal of the processor.
The thirteenth pin of the multiplexer U2 is a signal input terminal X0, which is connected to the output of the processor,
the fourteenth pin of the multiplexer U2 is another signal input terminal X1, which is connected to the output terminal of the schmitt trigger U1.
With this arrangement, when the input port X0 is selected, the multiplexer switch U2 transmits the modified pulse signal output from the processor to the subsequent circuit, and when the input port X1 is selected, the multiplexer switch U2 transmits the modified original pulse signal to the subsequent circuit. The modified pulse signal output by the processor is stored in the processor in advance.
Continuing, a second shaping unit may be connected in series to the output terminal of the multiplexer U2 for further filtering and shaping the pulse signal in the circuit. In this embodiment, the second shaping unit may adopt a schmitt trigger U3 with a model number HEF 4093.
The isolation unit is used for isolating internal and external signals of the circuit, and a power supply provided by the calibration timing device has a plurality of interference sources due to long connecting lines, so that interference of the external power supply on the internal circuit is avoided after the optical coupler is added, and the output precision of pulse signals is improved. In this embodiment, the isolation unit adopts a high-speed optocoupler G1 with model number TLP 109.
The pulse output unit comprises a triode Q2 and a bidirectional diode D1, wherein the base electrode of the triode Q2 is connected with the emitter electrode of the optocoupler G1 and is used for starting or closing the output unit; one end of the bidirectional diode D1 is connected with the output end of the pulse output unit, and the other end is grounded, so that the electrostatic impact of external equipment on the pulse output circuit of the electrostatic flowmeter is protected. In this embodiment, the transistor Q2 has a model number 5551, and the bidirectional diode D1 has a model number P6KE36 CA.
In practical use, an original pulse PSE output by the flow sensor is input into an input port X1 of a multi-way selector switch U2 after being shaped by a Schmidt trigger U1; the processor outputs the modified pulse signal PIN, inputs the modified pulse signal PIN into an input port X0 of a multi-way selector switch U2, and can select an original pulse PSE or the modified pulse signal PIN through a selection port A or a selection port B of the multi-way selector switch U2. Pulse signals output by the multi-path selection switch U2 are reshaped by a Schmitt trigger U3 and then transmitted to a base electrode of a triode Q1 of the isolation unit, a current driving optocoupler G1 is generated by the triode Q1 and a resistor R2, an output end of the optocoupler G1 drives a triode Q2 of the pulse output unit, a collector of the triode Q2 is connected with a third voltage through a resistor R4, a pulse signal is generated at the collector of the triode Q2, and the pulse signal is output after being limited by a resistor R5.
The utility model discloses a flowmeter pulse output circuit still includes electrical unit, and electrical unit can adopt the external power supply, exports first voltage, second voltage and third voltage after the vary voltage, provides operating voltage for whole circuit. In this embodiment, the first voltage is 3.3V, the second voltage is 5V, and the third voltage is 24V.
To sum up, the utility model discloses a flowmeter pulse output circuit, increased the pulse signal after revising all the way on current original pulse signal basis to switch over two way signals through the multi-way switch, can realize the selection of input signal source in a flexible way, thereby realize the pulse signal output of flowmeter and the automatic electronic correction of flowmeter; a shaping unit is added to shape the original pulse and filter out some clutter with smaller amplitude; the isolation unit is additionally arranged to isolate internal and external signals, so that interference of an external power supply to an internal circuit is avoided, and the output precision of pulse signals is improved. The utility model relates to a rationally, have higher economic benefits and social. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A flowmeter pulse output circuit, comprising: the device comprises a first shaping unit, a signal selection unit, a processor, an isolation unit and a pulse output unit;
the input end of the first shaping unit is connected with the output end of an external flow sensor and used for receiving an original pulse signal, the output end of the first shaping unit is connected with the input end of the signal selection unit, the input end of the signal selection unit is also connected with the output end of the processor, the output end of the signal selection unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the pulse output unit.
2. The flowmeter pulse output circuit of claim 1, wherein: the first shaping unit includes a schmitt trigger.
3. The flowmeter pulse output circuit of claim 1, wherein: the signal selection unit comprises a multi-path selection switch, a selection end and a signal input end of the multi-path selection switch are respectively connected with the output end of the processor, and the other signal input end is connected with the output end of the first shaping unit.
4. The flowmeter pulse output circuit of claim 1, wherein: the isolation unit comprises an optocoupler G1, a triode Q1 and a plurality of resistors;
resistance R1's one end with the output of signal selection unit is connected, and the other end is connected with triode Q1's base, triode Q1's emitter ground, and the collecting electrode is connected with opto-coupler G1's negative pole, and opto-coupler G1's positive pole passes through resistance R2 and is connected with first voltage, and opto-coupler G1's power end is connected with second voltage, and opto-coupler G1's collecting electrode passes through resistance R3 and is connected with second voltage, and opto-coupler G1's emitter is as the output of isolation unit, with pulse output unit's input is connected.
5. The flowmeter pulse output circuit of claim 1, wherein: the pulse output unit comprises a triode Q2, a bidirectional diode D1, a resistor R4 and a resistor R5;
the base electrode of the triode Q2 is connected with the output end of the isolation unit, the emitter electrode is grounded, the collector electrode is respectively connected with one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R4 is connected with the third voltage, the other end of the resistor R5 is connected with one end of the bidirectional diode D1, the other end of the bidirectional diode D1 is grounded, and the other end of the resistor R5 is also used as the output end of the pulse output unit to output pulse signals.
6. The flowmeter pulse output circuit of claim 1, wherein: the circuit further comprises a second shaping unit, and the second shaping unit is connected in series between the signal selection unit and the isolation unit.
7. The flowmeter pulse output circuit of claim 6, wherein: the second shaping unit includes a schmitt trigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022171185.6U CN213305378U (en) | 2020-09-28 | 2020-09-28 | Flowmeter pulse output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022171185.6U CN213305378U (en) | 2020-09-28 | 2020-09-28 | Flowmeter pulse output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213305378U true CN213305378U (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022171185.6U Active CN213305378U (en) | 2020-09-28 | 2020-09-28 | Flowmeter pulse output circuit |
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| CN (1) | CN213305378U (en) |
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2020
- 2020-09-28 CN CN202022171185.6U patent/CN213305378U/en active Active
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