CN214251201U - Pulse signal output circuit and flowmeter - Google Patents
Pulse signal output circuit and flowmeter Download PDFInfo
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- CN214251201U CN214251201U CN202023104660.4U CN202023104660U CN214251201U CN 214251201 U CN214251201 U CN 214251201U CN 202023104660 U CN202023104660 U CN 202023104660U CN 214251201 U CN214251201 U CN 214251201U
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Abstract
The utility model provides a pulse signal output circuit and flowmeter relates to the circuit technology, includes: the device comprises a signal receiving module, a photoelectric coupler and a signal conversion module; the signal receiving module is connected with the photoelectric coupler, and the photoelectric coupler is connected with the signal conversion module; the signal receiving module is used for receiving the source pulse signal collected by the flowmeter and sending the source pulse signal to the photoelectric coupler; the photoelectric coupler is used for performing electric-optical-electric conversion processing on the received source pulse signal to obtain an electric signal and transmitting the electric signal to the signal conversion module; the signal conversion module is used for converting the received electric signals to obtain and output pulse signals corresponding to the source pulse signals. The application provides be provided with optoelectronic coupler among pulse signal output circuit and the flowmeter, through optoelectronic coupler transmission pulse signal, can keep apart the inside processing system and the external interface circuit of flowmeter to improve flowmeter processing system's outside anti-interference performance.
Description
Technical Field
The present disclosure relates to circuit technologies, and in particular, to a pulse signal output circuit and a flow meter.
Background
In many application scenes, a flowmeter is required to be arranged, and the magnitude of a measured object is acquired through the flowmeter. For example, a flow meter is required to be installed in a natural gas pipeline, and for example, a flow meter is required to be installed in a tap water pipeline, and the flow meters are used for collecting the usage amount of natural gas or tap water.
Among them, as a special measuring instrument for energy measurement, particularly, a flowmeter for energy measurement used in the industrial and commercial industries is required to have a precision satisfying national requirements. Therefore, it is necessary to detect the accuracy of the flowmeter periodically, and in general, when the measurement accuracy of the flowmeter is detected, it is necessary to output a pulse signal in the form of an electric pulse from the flowmeter and make a determination based on the output pulse signal.
In the flowmeter provided with the pulse signal output circuit in the prior art, the electromagnetic compatibility protection is poor, and the phenomenon of product halt or reset is often caused when relevant experiment tests of electromagnetic compatibility are carried out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pulse signal output circuit and flowmeter to solve the flowmeter electromagnetic compatibility among the prior art protection nature poor technical problem.
A first aspect of the present disclosure provides a pulse signal output circuit including:
the device comprises a signal receiving module, a photoelectric coupler and a signal conversion module;
the signal receiving module is connected with the photoelectric coupler, and the photoelectric coupler is connected with the signal conversion module;
the signal receiving module is used for receiving a source pulse signal collected by the flowmeter and sending the source pulse signal to the photoelectric coupler;
the photoelectric coupler is used for performing electric-optical-electric conversion processing on the received source pulse signal to obtain an electric signal and sending the electric signal to the signal conversion module;
the signal conversion module is used for converting the received electric signal to obtain and output an output pulse signal corresponding to the source pulse signal.
In an optional embodiment, the system further comprises a logic negation module;
the signal receiving module is connected with the logic negation module, and the logic negation module is connected with the photoelectric coupler;
the signal receiving module sends the source pulse signal to the logic negation module, and the logic negation module processes the source pulse signal to obtain and send a first sub-signal to the photoelectric coupler.
In an optional embodiment, the system further comprises an external power acquisition module;
the external power supply acquisition module is connected between an external power supply and the control unit of the processor;
when the external power supply supplies power, the external power supply acquisition module sends a first reference signal to the processor;
when the external power supply does not supply power, the external power supply acquisition module sends a second reference signal to the processor;
the external power supply supplies power to the photoelectric coupler and the signal conversion module.
In an alternative embodiment, the control unit is connected to the signal receiving module;
if the processor receives the first reference signal, the processor sends a first control signal to the signal receiving module;
when the signal receiving module receives the first control signal, the signal receiving module receives a source pulse signal collected by a flowmeter;
if the processor receives the second reference signal, the processor sends a second control signal to the signal receiving module;
and when the signal receiving module receives the second control signal, the signal receiving module continuously outputs a preset level.
In an alternative embodiment, the signal receiving module includes: a signal receiving chip;
a first signal input pin of the signal receiving chip is connected with a working condition pulse output end of the flowmeter, and a second signal input pin of the signal receiving chip is connected with a standard condition pulse output end of the flowmeter;
the setting pin of the signal receiving chip is connected with a processor of the flowmeter and used for receiving a channel selection signal sent by the processor;
when the channel selection signal is a first channel signal, a first signal input pin of the signal receiving chip is turned on, and the first signal input pin is used for receiving working condition pulses;
and when the channel selection signal is a second channel signal, a second signal input pin of the signal receiving chip is turned on, and the second signal input pin is used for receiving standard condition pulses.
In an alternative embodiment, the logical negation module includes: the first current limiting submodule and the logic not circuit are connected;
the first current limiting submodule is connected between the signal receiving module and the logic not circuit; the logic not circuit is connected between the first current limiting submodule and the photoelectric coupler;
the first current limiting submodule receives the source pulse signal sent by the signal receiving module and carries out current limiting on the source pulse signal to obtain a current limiting signal;
the first current limiting submodule sends the current limiting signal to the logic not circuit;
and the logic not circuit carries out reverse processing on the current limiting signal to obtain and send the first sub-signal to the photoelectric coupler.
In an alternative embodiment, the first current limiting submodule includes: the circuit comprises a first resistor, a second resistor and a second capacitor;
the first resistor is connected between the signal receiving module and the logical not circuit;
the second resistor is connected between an input pin of the logical not circuit and the ground;
the second capacitor is connected between the input pin of the logical not circuit and ground.
In an alternative embodiment, the logical negation module further includes: a third resistor, a third capacitor and a fourth capacitor;
the third resistor is arranged between a power supply pin of the logic not circuit and the first power supply;
the third capacitor is arranged between the first power supply and the ground;
the fourth capacitor is arranged between the output pin of the logic not circuit and the ground.
In an alternative embodiment, the circuit further comprises: a first current limiting resistor; the photoelectric coupler comprises a light emitting component and a light receiving component;
the first current limiting resistor is connected between the first end of the light emitting component and a first power supply;
the logic negation module is connected with the second end of the light-emitting component.
The first end of the light receiving component is connected with an external power supply, and the second end of the light receiving component is connected with the signal conversion module.
In an alternative embodiment, the method comprises the following steps: a fourth resistor and a fifth resistor;
a first end of the fourth resistor is connected with an external power supply, and a second end of the fourth resistor is respectively connected with a first end of the fifth resistor, a second end of the light receiving component and the signal conversion module;
and the second end of the fifth resistor is connected with the ground.
In an alternative embodiment, the signal conversion module comprises: a conversion output circuit;
the conversion output circuit is connected with the photoelectric coupler;
and the conversion output circuit receives the electric signal sent by the photoelectric coupler, converts the electric signal and obtains and outputs an output pulse signal corresponding to the source pulse signal.
In an alternative embodiment, the conversion output circuit includes: p-type field effect transistor, N-type field effect transistor;
the photoelectric coupler is respectively connected with the grid electrode of the P-type field effect transistor and the grid electrode of the N-type field effect transistor;
the drain electrode of the P-type field effect transistor is connected with the drain electrode of the N-type field effect transistor, and the connection position of the drain electrodes sends an output pulse signal outwards;
alternatively, the conversion output circuit includes: a P-type triode, an N-type triode;
the photoelectric coupler is respectively connected with the base electrode of the P-type triode and the base electrode of the N-type triode;
and the collector electrode of the P-type triode is connected with the collector electrode of the N-type triode, and the connection part sends an output pulse signal outwards.
In an alternative embodiment, the signal conversion module comprises: a fifth capacitor;
the junction of the drain electrode of the P-type field effect transistor and the drain electrode of the N-type field effect transistor is grounded through the fifth capacitor;
or the junction of the collector of the P-type triode and the collector of the N-type triode is connected through the fifth capacitor;
and/or, the signal receiving module comprises: a first capacitor;
the first capacitor is connected between a power supply pin and a grounding pin of the signal receiving chip.
In an alternative embodiment, the signal conversion module comprises: a second current limiting resistor and a sixth capacitor;
the source electrode of the P-type field effect transistor is connected with an external power supply through the second current limiting resistor;
the sixth capacitor is connected between the external power supply and ground.
In an optional embodiment, the signal conversion module further comprises: a first bidirectional transient suppression diode and a voltage regulator tube;
the first bi-directional transient suppression diode is connected between the external power source and ground;
the voltage-stabilizing tube is connected between the external power supply and the ground.
In an optional embodiment, the signal conversion module further comprises: a second bidirectional transient suppression diode;
and the second bidirectional transient suppression diode is connected between the drain electrode connection positions of the P-type field effect transistor and the N-type field effect transistor and the ground.
In an alternative embodiment, the external power harvesting module comprises an external daylighting electric coupler, a second voltage-dividing sub-module;
the external power supply is connected with the second voltage-dividing sub-module, the second voltage-dividing sub-module is connected with the external lighting electric coupler, and the external lighting electric coupler is connected with the processor;
the external power supply sends a power supply signal to the second voltage division submodule;
the second voltage division submodule performs voltage division processing on the power supply signal to obtain and send a voltage division signal to the external lighting electric coupler;
and the external lighting electric coupler processes the received voltage division signal to generate an optical signal, and then sends the first reference signal or the second reference signal to the processor according to the optical signal.
In an optional embodiment, the external power collection module further comprises: a pull-up resistor;
the output end of the external lighting electric coupler is connected with a first power supply through the pull-up resistor;
when the external power supply does not supply power, the external lighting electric coupler sends a voltage signal corresponding to the first power supply to the processor.
In an optional embodiment, the external power collection module further comprises: a seventh capacitor and an eighth capacitor;
the seventh capacitor is connected between the pull-up resistor and ground;
the eighth capacitor is connected between the external daylighting electric coupler and ground.
Another aspect of the present disclosure is to provide a flow meter, comprising: the pulse signal output circuit according to the first aspect.
The utility model provides a pulse signal output circuit and flowmeter includes: the device comprises a signal receiving module, a photoelectric coupler and a signal conversion module; the signal receiving module is connected with the photoelectric coupler, and the photoelectric coupler is connected with the signal conversion module; the signal receiving module is used for receiving the source pulse signal collected by the flowmeter and sending the source pulse signal to the photoelectric coupler; the photoelectric coupler is used for performing electric-optical-electric conversion processing on the received source pulse signal to obtain an electric signal and transmitting the electric signal to the signal conversion module; the signal conversion module is used for converting the received photoelectric signal to obtain and output an output pulse signal corresponding to the source pulse signal. The application provides be provided with optoelectronic coupler among pulse signal output circuit and the flowmeter, through optoelectronic coupler transmission pulse signal, can keep apart the inside processing system and the external interface circuit of flowmeter to improve flowmeter processing system's outside anti-interference performance.
Drawings
FIG. 1 is a diagram illustrating an application scenario in accordance with an exemplary embodiment of the present application;
fig. 2 is a schematic diagram of a pulse signal output circuit according to a first exemplary embodiment of the present application;
fig. 3 is a schematic diagram of a pulse signal output circuit according to a second exemplary embodiment of the present application;
FIG. 4 is a schematic diagram of a logic NOT module for processing a pulse signal according to an exemplary embodiment of the present application;
fig. 5 is a schematic diagram of a pulse signal output circuit according to a third exemplary embodiment of the present application;
fig. 6 is a schematic diagram of a pulse signal output circuit according to a fourth exemplary embodiment of the present application;
fig. 7 is a schematic diagram of a pulse signal output circuit according to a fifth exemplary embodiment of the present application;
fig. 8 is a schematic diagram of a pulse signal output circuit according to a sixth exemplary embodiment of the present application;
fig. 9 is a schematic diagram of a pulse signal output circuit according to a seventh exemplary embodiment of the present application;
fig. 10 is a schematic diagram of a pulse signal output circuit according to an eighth exemplary embodiment of the present application.
Description of reference numerals:
a meter 11;
a pipe 12;
a signal receiving module 21;
a photocoupler 22;
a signal conversion module 23;
a logical not module 31;
the pulse signal 41;
the first subsignal 42;
a pulse signal output circuit 50;
an external power source collection module 51;
an external power supply 52;
a processor 53;
a signal receiving single chip microcomputer 211;
a first capacitance C1;
a first current limit submodule 311;
a logical not circuit 312;
a first resistor R5;
a second resistor R6;
a second capacitance C4;
a third resistor R2;
a third capacitance C3;
fourth capacitance C6
A first current limiting resistor R3;
the photocoupler includes a light emitting assembly 81;
a light receiving element 82;
a fourth resistor R4;
a fifth resistor R7;
a conversion output circuit 231;
p-type field effect transistor Q1;
an N-type field effect transistor Q2;
a fifth capacitance C5;
a second current limiting resistor R1;
a sixth capacitance C2;
a first bidirectional transient suppression diode D2;
a voltage regulator tube D1;
a second bidirectional transient suppression diode D3;
an external lighting electric coupler 511;
a second voltage-dividing sub-module 512;
pull-up resistor R8;
a seventh capacitance C7;
an eighth capacitor C8.
Detailed Description
When the flowmeter counts the flow, pulse signals are output according to the instantaneous working condition flow, one pulse corresponds to a fixed flow, and the flow passing through can be counted according to the number of the pulses. When the accuracy of the flowmeter is verified, energy can pass through the flowmeter, pulse signals output by the flowmeter are obtained, a statistical result of the flowmeter is determined based on the pulse signals, and the energy quantity flowing through the flowmeter is compared with the statistical result, so that the precision of the meter is determined.
Fig. 1 is a diagram illustrating an application scenario according to an exemplary embodiment of the present application.
As shown in fig. 1, the meter 11 may be installed in a pipe 12 that is capable of transmitting energy, such as tap water, but also natural gas.
The flow meter 11 may be connected to an external test device so that the external test device receives the pulse signals output by the flow meter 11, in which way the statistical outcome of the flow meter 11 may be determined. The display of flow meter 11 may also be viewed directly to determine the statistical outcome of flow meter 11.
The statistical results of the flow meter 11 can be compared to the amount of energy actually passing through the flow meter 11 to determine the accuracy of the flow meter 11.
Since the flowmeter 11 needs to output a pulse signal to the outside, a pulse signal output circuit needs to be provided in the flowmeter 11. In the pulse signal output circuit in the prior art, the electromagnetic compatibility is poor in protection, so that when electromagnetic compatibility related experiment tests are performed on the flowmeter, for example, when experiments such as surge tests, fast transient group pulses, static tests and the like are performed, the flowmeter is often halted or reset.
In order to solve the technical problem, the pulse signal output circuit provided by the application comprises a signal receiving module, a photoelectric coupler and a signal conversion module; the signal receiving module is connected with optoelectronic coupler, and optoelectronic coupler is connected with the signal conversion module, and optoelectronic coupler can insulate isolation signal receiving module and signal conversion module, and signal receiving module is used for receiving flowmeter's source pulse signal, and consequently, optoelectronic coupler can insulate isolation signal conversion module and flowmeter's processing system, and then can improve flowmeter processing system's outside interference killing feature.
Fig. 2 is a schematic diagram of a pulse signal output circuit according to a first exemplary embodiment of the present application.
As shown in fig. 2, the present application provides a pulse signal output circuit including: the device comprises a signal receiving module 21, a photoelectric coupler 22 and a signal conversion module 23.
The signal receiving module 21 can receive a source pulse signal collected by the flowmeter.
In one embodiment, the signal receiving module 21 may be connected to a processor inside the flow meter. The inside of the flowmeter can be provided with a sensor for collecting the flow of energy. The sensor may send a sensor signal to a processor, which may process the sensor signal to generate a source pulse signal. The processor may send the processed source pulse signal to the signal receiving module 21.
In another embodiment, the sensor of the flow meter may collect the flow rate of the energy source and generate sensor data, which is sent to the single chip, corrected by the receiving single chip, and send the source pulse signal to the signal receiving module 21.
Specifically, the signal receiving module 21 may also be connected to the processor and the sensor at the same time. A signal receiving channel of the signal receiving module 21 may also be provided, so that the signal receiving channel receives the source pulse signal sent by the processor, or receives the source pulse signal corrected by the single chip microcomputer.
Further, the signal receiving module 21 may transmit the received source pulse signal to the photo coupler 22.
The photoelectric coupler is an electric transmission device for transmitting an electric signal using light as a medium. It is composed of two parts of luminous source and light receiver. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end.
The photocoupler 22 can perform electro-optic-electrical conversion processing on the received source pulse signal to obtain an electrical signal. The photocoupler 22 is connected to the signal conversion module 23 and can transmit the converted electrical signal to the signal conversion module 23.
The signal conversion module 23 may perform conversion processing on the received electrical signal, for example, the signal conversion module 23 may be converted into a square wave pulse signal with a regular shape. The signal conversion module 23 may have a signal output interface for outputting the converted output pulse signal corresponding to the source pulse signal.
In practical application, in the circuit provided by the application, the photoelectric coupler 22 is used for transmitting an electric signal, so that the electric appliance is isolated from the signal receiving module 21 and the signal conversion module 23. And the signal receiving module 21 is connected with the internal processing system of the flowmeter, and then the internal processing system and the external interface of the flowmeter can be isolated through the photoelectric coupler 22, so that the external anti-interference performance of the flowmeter processing system is improved.
The pulse signal output circuit provided by the application can be arranged in the flowmeter, so that when the flowmeter is subjected to an electromagnetic compatibility experiment, the internal processing system of the flowmeter cannot be halted or reset due to poor electromagnetic compatibility protectiveness.
The application provides a pulse signal output circuit includes: the device comprises a signal receiving module, a photoelectric coupler and a signal conversion module; the signal receiving module is connected with the photoelectric coupler, and the photoelectric coupler is connected with the signal conversion module; the signal receiving module is used for receiving the source pulse signal collected by the flowmeter and sending the source pulse signal to the photoelectric coupler; the photoelectric coupler is used for performing electric-optical-electric conversion output on the received source pulse signal and then sending an electric signal to the signal conversion module; the signal conversion module is used for converting the received electric signals to obtain and output pulse signals corresponding to the source pulse signals. The application provides a be provided with optoelectronic coupler among the pulse signal output circuit, through optoelectronic coupler transmission pulse signal, can keep apart the inside processing system and the external interface circuit of flowmeter to improve flowmeter processing system's outside anti-interference ability.
Fig. 3 is a schematic diagram of a pulse signal output circuit according to a second exemplary embodiment of the present application.
As shown in fig. 3, the pulse signal output circuit provided by the present application further includes a logical not module 31.
The signal receiving module 21 is connected to the logical not module 31, and the logical not module 31 is connected to the photocoupler 22, that is, the logical not module 31 may be disposed between the signal receiving module 21 and the logical not module 31.
In this embodiment, the signal receiving module 21 may send the received source pulse signal to the logical negation module 31, and the logical negation module 31 may process the received source pulse signal to obtain the first sub-signal. Specifically, the source pulse signal may be processed in reverse, for example, the amplitude 0 in the source pulse signal is changed to 1, and the amplitude 1 in the pulse signal is changed to 0. For example, a not logic gate circuit may be provided in the not logic block 31, and the pulse signal can be processed in reverse by the not logic gate circuit.
Fig. 4 is a schematic diagram illustrating a logic not module to pulse signal processing according to an exemplary embodiment of the present application.
As shown in fig. 4, after the pulse signal 41 is input to the logical not module, the first sub-signal shown as 42 is output, and the logical not module 31 may invert the pulse signal 41.
Optionally, the logical negation module 31 may further send the processed first sub-signal to the photocoupler 22, and transmit the first sub-signal to the signal conversion module 23 through the photocoupler 22.
When the signal conversion module 23 is provided with a field effect transistor conversion circuit or a triode conversion circuit, the logic negation module 31 is provided, so that the polarity of the source pulse signal received by the circuit is consistent with the polarity of the high and low levels of the output pulse signal, for example, at time t, the source pulse signal is at the high level, and then at time k, the output pulse signal is also at the high level, thereby facilitating the design of the circuit control logic.
Fig. 5 is a schematic diagram of a pulse signal output circuit according to a third exemplary embodiment of the present application.
As shown in fig. 5, the pulse signal output circuit 50 provided by the present application further includes an external power source collecting module 51. The external power harvesting module 51 is connected between an external power source 52 and a processor 53 of the flow meter.
Wherein, the external power source collecting module 51 can send a power supply signal of the external power source 52 to the processor 53. If the external power source 52 supplies power to the outside, the external power source acquisition module 51 sends a first reference signal to the processor 53, so that the processor 53 determines that the external power source can supply power normally; when the external power source does not supply power, the external power source collecting module 51 sends a second reference signal to the processor 53, so that the processor 53 determines that the external power source does not supply power.
Specifically, the external power source 52 may be connected to the photocoupler 22 and the signal conversion module 23 to supply power to the photocoupler 22 and the signal conversion module 23.
Further, the processor 53 may also send a control signal to the signal receiving module 21.
When the processor 53 receives the first reference signal, the processor 53 sends a first control signal to the signal receiving module 21. I.e. the external power source 52 is normally powered, the processor 53 sends a first control signal to the signal receiving module 21. When the signal receiving module 21 receives the first control signal, the signal receiving module 21 may receive a source pulse signal collected by the flow meter and send the source pulse signal to the logical-not module 31 or the photocoupler 22.
In practical application, when the processor 53 receives the second reference signal, the processor 53 sends a second control signal to the signal receiving module 21. That is, the external power source 52 cannot normally supply power, the processor 53 sends the second control signal to the signal receiving module 21. When the signal receiving module 21 receives the second control signal, the signal receiving module 21 continuously outputs the preset level.
If the not logic block 31 is provided, the preset level may be a high level, and after the high level enters the not logic block 31, a continuous low level is output, so that the input side of the photocoupler 22 cannot operate, and the power consumption of the whole transmission circuit is reduced.
If the not logic module 31 is not provided, the preset level may be a low level, and the signal receiving module 21 may continuously send a low level signal to the photocoupler 22, so that the input side of the photocoupler 22 may not operate, thereby reducing the power consumption of the entire transmission circuit.
Fig. 6 is a schematic diagram of a pulse signal output circuit according to a fourth exemplary embodiment of the present application.
As shown in fig. 6, in the pulse signal output circuit provided in the present application, the signal receiving module 21 includes: the signal receiving chip 211 (U1).
The signal receiving chip 211 has a plurality of pins, wherein the signal receiving chip 211 may have signal input pins, a first signal input pin is connected to an operating condition pulse output terminal of the flow meter, and a second signal input pin of the signal receiving chip 211 is connected to a standard condition pulse output terminal of the flow meter.
For example, a first signal input pin (pins 7, 9) may be connected to a sensor of the flow meter for receiving a condition PULSE (MEAS-PULSE-IN) sent by the sensor. As another example, the second signal input pins (pins 2, 4) may be coupled to the processor 53 pins of the flow meter for receiving a standard condition PULSE (MCU-PULSE-OUT) sent by the processor 53.
Specifically, the Signal receiving chip 211 may further have setting pins (pins 1 and 5), which may be connected to pins of the processor 53, for receiving a channel selection Signal (MCU-Signal-CTL1) sent by the processor 53.
Further, when the channel selection signal received by the signal receiving chip 211 is a first channel signal, the signal receiving chip 211 controls the first signal input pin to be turned on, and the first signal input pin is used for receiving the working condition pulse. In this embodiment, the pulse signal output circuit can output the operating pulse of the flowmeter.
When the channel selection signal received by the signal receiving chip 211 is the second channel signal, the signal receiving chip 211 controls the second signal input pin to be turned on, and the second signal input pin is used for receiving the standard condition pulse. In this embodiment, the pulse signal output circuit can output a standard condition pulse of the flowmeter.
When the flowmeter counts the flow, the working condition pulse can be directly obtained according to the energy flowing through, and the processor of the flowmeter can process the working condition pulse to obtain the standard condition pulse.
In an alternative embodiment, if the not logic module 31 is provided, the signal receiving chip 211 is connected between the processor 53 of the flow meter and the not logic module 31.
In the circuit that this application provided, can select output operating mode pulse or standard condition pulse according to the demand.
With continued reference to fig. 6, in an alternative embodiment, the signal receiving module includes: a first capacitor C1.
The first capacitor C1 is connected between the power supply pin (pin 8) and the ground pin (pin 3) of the signal receiving chip 211. The power pin may be connected to a +3V power supply and the ground pin may be connected to ground.
The first capacitor C1 may be a patch capacitor, and specifically may be a decoupling capacitor in the patch capacitor, and is provided with the first capacitor C1, which can perform the noise reduction function on the input power energy storage and the bypass high-frequency noise signal.
Fig. 7 is a schematic diagram of a pulse signal output circuit according to a fifth exemplary embodiment of the present application.
As shown in fig. 7, in the pulse signal output circuit provided in the present application, the logical not module 31 includes: a first current limiting submodule 311 and a logical not circuit 312.
The first current limiting submodule 311 is connected between the signal receiving module 21 and the not logic circuit 312. The first current limiting submodule 311 can limit the current of the source pulse signal sent by the signal receiving module 21, so as to obtain a current limiting signal.
The first current limiting submodule 311 sends a current limiting signal to the nor logic circuit 312, and the nor logic circuit 312 performs inverse processing on the current limiting signal to obtain a first sub-signal.
The logic not circuit 312 is connected between the first current limiting sub-module 311 and the photo coupler 32, and the logic not circuit 312 may transmit the first sub-signal to the photo coupler 32, thereby transmitting a pulse signal through the photo coupler 32.
Referring to fig. 7, the first current limiting submodule 311 includes: the circuit comprises a first resistor R5, a second resistor R6 and a second capacitor C4.
Specifically, the first resistor R5 is connected between the signal receiving module 21 and the logic not circuit 312, and the second resistor R6 is connected between the input pin (pin 2) of the logic not circuit 312 and the ground. The R5 and the R6 form a voltage divider circuit, thereby reducing the current of the electrical signal input to the nor circuit 312 and ensuring the stability of the input signal to the nor circuit 312.
Furthermore, the second capacitor C4 is connected between the input pin of the nor circuit and ground, and the C4 is connected in parallel with the R6, so as to achieve the filtering function, and further ensure the stability of the input signal of the nor circuit 312.
In practical applications, the logic negation module 31 further includes: a third resistor R2, a third capacitor C3 and a fourth capacitor C6.
The third resistor R2 is disposed between the power supply pin (pin 5) of the logic not circuit 312 and the first power supply. The output voltage of the first power supply may be, for example, 3V. R2 is capable of limiting the voltage input to the logical not circuit 312.
The third capacitor C3 is disposed between the first power supply and ground. The third capacitor C3 may be a patch capacitor, specifically, a decoupling capacitor in the patch capacitor, and is provided with a third capacitor C3, which can perform a denoising effect on the input power energy storage and the bypass high-frequency noise signal.
The fourth capacitor C6 is disposed between the output pin (pin 4) of the logical not circuit 312 and ground. The fourth capacitor C6 may be a patch capacitor, and specifically may be a decoupling capacitor in the patch capacitor, and the fourth capacitor C6 is provided to perform a denoising effect on the bypass high-frequency noise signal, so that the noise interference of the signal input from the nor logic circuit 312 to the photocoupler 22 is smaller.
Fig. 8 is a schematic diagram of a pulse signal output circuit according to a sixth exemplary embodiment of the present application.
As shown in fig. 8, in the pulse signal output circuit provided in the present application, the circuit further includes: a first current limiting resistor R3; the photocoupler includes a light emitting element 81 and a light receiving element 82.
Alternatively, the model of the photocoupler may be, for example, TLP 109.
The first current limiting resistor R3 is connected between the first end of the light emitting element 81 and the first power source. The first power supply may be, for example, 3V, and may also supply power to the logic not module 31.
The logical negation module 31 is connected to the second end of the light emitting element 81. The logical negation module 31 may send the first sub-signal to the light emitting element 81 to cause the light emitting element 81 to emit light. The light emitting element 81 may be, for example, a light emitting diode.
The first end of the light receiving element 82 is connected to the external power source 52, the external power source 52 can provide power for the light receiving element 82, and the light receiving element 82 can sense the light emitted by the light emitting element 81 and generate an electrical signal.
Specifically, the second end of the light receiving element 82 is connected to the signal conversion module 23, and transmits the electrical signal to the signal conversion module 23.
In this embodiment, the light emitting element and the light receiving element in the photocoupler transmit the electrical signal, so that the internal processing system of the flowmeter can be electrically isolated from the external interface circuit, thereby improving the external anti-interference performance of the internal processing system of the flowmeter.
With continuing reference to fig. 8, the pulse signal output circuit provided in the present application further includes: a fourth resistor R4 and a fifth resistor R7.
Furthermore, a first end of the fourth resistor R4 is connected to the external power source 52, a second end of the fourth resistor R4 is connected to the first end of the fifth resistor R7, the second end of the photo detector 82, and the signal conversion module 23, respectively, and a second end of the fifth resistor R7 is connected to ground.
In practical application, R4 and R7 are current-limiting voltage-dividing resistors, and the divided signal (PULSE-OUT HL) is an input signal of the signal conversion module 23.
Fig. 9 is a schematic diagram of a pulse signal output circuit according to a seventh exemplary embodiment of the present application.
As shown in fig. 9, in the pulse signal output circuit provided in the present application, the signal conversion module 23 includes: a conversion output circuit 231; the conversion output circuit 231 is connected to the photocoupler 22. The conversion output circuit 231 receives the electric signal output from the photocoupler 22.
Specifically, the second terminal of the light receiving element 82 in the photocoupler 22 may be connected to the conversion output circuit 231, and further, the light receiving element 82 transmits an electrical signal to the conversion output circuit 231.
Further, the conversion output circuit 231 performs conversion processing on the received electric signal to obtain and output an output pulse signal corresponding to the source pulse signal.
In practical applications, the conversion output circuit 231 may include: p type field effect transistor Q1, N type field effect transistor Q2.
The photocoupler 22 is connected to the gate of the P-type fet Q1 and the gate of the N-type fet Q2, respectively. For example, the second terminal of the light receiving element 82 in the photocoupler 22 is connected to the gate of the P-type fet Q1 and the gate of the N-type fet Q2. Thereby sending the electrical signal to the conversion output circuit 231.
The drain of the PFET Q1 is connected to the drain of the NFET Q2, where the output PULSE signal (PULSE-OUT) is sent OUT.
When the grid level of the common end of the two field effect transistors is high level, the connection position of the drain electrode is low level; when the grid level of the two field effect transistors is low level, the high level consistent with the power supply voltage of the external power supply is output at the drain electrode connection position.
In an alternative embodiment, the conversion output circuit 231 includes: a P-type triode, an N-type triode; the photoelectric coupler is respectively connected with the base electrode of the P-type triode and the base electrode of the N-type triode; the collector of the P-type triode is connected with the collector of the N-type triode, and the connection part sends an output pulse signal outwards.
Referring to fig. 9, the signal conversion module includes: a fifth capacitance C5; the junction of the drain of the P-type field effect transistor and the drain of the N-type field effect transistor is grounded through a fifth capacitor C5.
If the conversion output circuit 231 includes: the junction of the collector of the P-type triode and the collector of the N-type triode is grounded through a fifth capacitor C5.
The fifth capacitor C5 may be a patch capacitor, and specifically may be a decoupling capacitor in the patch capacitor, and is provided with the fifth capacitor C5, which can perform a denoising effect on the bypass high-frequency noise signal, so that the noise interference of the finally output pulse signal is smaller.
Optionally, the signal conversion module 23 further includes: a second current limiting resistor R1 and a sixth capacitor C2;
the source of the pfet Q1 is connected to the external power source 52 through a second current limiting resistor R1. R1 can reduce the current in the conversion output circuit 231.
The sixth capacitor C2 is connected between the external power source 52 and ground. The sixth capacitor C2 may be a patch capacitor, specifically, a decoupling capacitor in the patch capacitor, and is provided with the sixth capacitor C2, which can perform a denoising effect on the input power energy storage and the bypass high-frequency noise signal.
Optionally, the signal conversion module 23 further includes: a first bi-directional transient suppression diode D2.
The first bi-directional transient suppression diode D2 is connected between the external power source 52 and ground. When the external input power supply is too large, the D2 can play a role of embedding and pulling voltage, so that all components on the left side of the circuit are protected from being damaged due to transient high voltage.
Optionally, the signal conversion module 23 further includes: a voltage regulator tube D1. A voltage regulator tube D1 is connected between the external power source 52 and ground. When the voltage D2 is clamped at a high voltage, the voltage regulator tube D1 can further stabilize the external input voltage, so that the external abnormal input voltage is stabilized at a corresponding voltage value.
In an alternative embodiment, the signal conversion module 23 further includes: and the second two-way transient suppression diode D3 and the second two-way transient suppression diode D3 are connected between the drain connection positions of the P-type field effect transistor and the N-type field effect transistor and the ground. D3 acts as a clamping voltage when there is too large interference signal or wiring error at the external pulse signal port, thus protecting all components on the left side of the circuit from being damaged by external transient high voltage.
Fig. 10 is a schematic diagram of a pulse signal output circuit according to an eighth exemplary embodiment of the present application.
As shown in fig. 10, in the pulse signal output circuit provided in the present application, the external power collecting module 51 includes an external lighting electric coupler 511 and a second voltage dividing sub-module 512;
the external power source 52 is connected to the second voltage-dividing sub-module 512. The external power source 52 is capable of sending a power signal to the second voltage-dividing sub-module 512; the second voltage division submodule 512 performs voltage division processing on the received power signal to obtain a voltage division signal.
The second voltage-dividing sub-module 512 may include resistors R9 and R10, and the external power source 52 is grounded via the resistors R9 and R10. The electrical signal divided at R10 is a voltage signal, which is input to the external lighting electric coupler 511 to provide a conduction condition for the photoelectric coupler.
The second voltage-dividing sub-module 512 is connected to the external lighting electric coupler 511, and the second voltage-dividing sub-module 512 can send a voltage-dividing signal to the external lighting electric coupler 511.
The external light-receiving electric coupler 511 is connected to the processor 53, and the external light-receiving electric coupler 511 processes the voltage signal to generate an optical signal and transmits the first reference signal or the second reference signal to the processor 53 according to the optical signal.
The external lighting electric coupler 511 is used for transmitting signals of the existence of the external power supply 52, and the external lighting electric coupler 511 can play a role of insulation and isolation, so that the external power supply 52 is electrically isolated from the flowmeter, and the performance of the processor for resisting external interference is improved.
In an alternative embodiment, the external power collecting module 51 further includes: pull-up resistor R8;
the output of the external lighting electric coupler 511 is connected to the first power source through a pull-up resistor R8. The first power supply may be, for example, a 3V power supply.
When the external power source 52 is not supplying power, the external lighting electric coupler 511 sends a voltage signal corresponding to the first power source to the processor 53.
In this embodiment, the external lighting electric coupler 511 can continuously transmit a 3V voltage signal to the processor 53 when the external power source 52 is not supplying power. The external light coupler 511, when powered by the external power source 52, is capable of processing the electrical signals generated by the processor 53 in response to the shunt signal. The processor is capable of determining whether the external power source 52 is supplying power based on the received signal.
Optionally, the external power collecting module 51 further includes: a seventh capacitor C7, an eighth capacitor C8;
the seventh capacitor C7 is connected between the pull-up resistor R8 and ground. The seventh capacitor C7 may be a patch capacitor, and specifically may be a decoupling capacitor in the patch capacitor, and the seventh capacitor C7 is provided to perform a denoising effect on the bypass high-frequency noise signal, so that the noise interference of the signal input to the processor is reduced.
An eighth capacitor C8 is connected between the external sampling photocoupler 511 and ground. The eighth capacitor C8 may be a patch capacitor, specifically, a decoupling capacitor in the patch capacitor, and is provided with the eighth capacitor C8, which can perform a denoising function on the input power energy storage and the bypass high-frequency noise signal.
The application also provides a flowmeter, which comprises the pulse signal output circuit.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
It should be noted that, in the description of the present invention, the terms "first" and "second" are only used for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the present invention, unless explicitly stated otherwise, the terms "mounting," "connecting," "fixing," and the like are to be understood in a broad sense, and for example, may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (20)
1. A pulse signal output circuit, comprising: the device comprises a signal receiving module, a photoelectric coupler and a signal conversion module;
the signal receiving module is connected with the photoelectric coupler, and the photoelectric coupler is connected with the signal conversion module;
the signal receiving module is used for receiving a source pulse signal collected by the flowmeter and sending the source pulse signal to the photoelectric coupler;
the photoelectric coupler is used for performing electric-optical-electric conversion processing on the received source pulse signal to obtain an electric signal and sending the electric signal to the signal conversion module;
the signal conversion module is used for converting the received electric signal to obtain and output an output pulse signal corresponding to the source pulse signal.
2. The pulse signal output circuit according to claim 1, further comprising a logical not block;
the signal receiving module is connected with the logic negation module, and the logic negation module is connected with the photoelectric coupler;
the signal receiving module sends the source pulse signal to the logic negation module, and the logic negation module processes the source pulse signal to obtain and send a first sub-signal to the photoelectric coupler.
3. The pulse signal output circuit according to claim 1 or 2, further comprising an external power supply collection module;
the external power supply acquisition module is connected between an external power supply and a control unit of the processor;
when the external power supply supplies power, the external power supply acquisition module sends a first reference signal to the processor;
when the external power supply does not supply power, the external power supply acquisition module sends a second reference signal to the processor;
the external power supply supplies power to the photoelectric coupler and the signal conversion module.
4. The pulse signal output circuit according to claim 3, wherein the control unit is connected to the signal receiving module;
if the processor receives the first reference signal, the processor sends a first control signal to the signal receiving module;
when the signal receiving module receives the first control signal, the signal receiving module receives a source pulse signal collected by a flowmeter;
if the processor receives the second reference signal, the processor sends a second control signal to the signal receiving module;
and when the signal receiving module receives the second control signal, the signal receiving module continuously outputs a preset level.
5. The pulse signal output circuit according to claim 1, wherein the signal receiving module includes: a signal receiving chip;
a first signal input pin of the signal receiving chip is connected with a working condition pulse output end of the flowmeter, and a second signal input pin of the signal receiving chip is connected with a standard condition pulse output end of the flowmeter;
the setting pin of the signal receiving chip is connected with a processor of the flowmeter and used for receiving a channel selection signal sent by the processor;
when the channel selection signal is a first channel signal, a first signal input pin of the signal receiving chip is turned on, and the first signal input pin is used for receiving working condition pulses;
and when the channel selection signal is a second channel signal, a second signal input pin of the signal receiving chip is turned on, and the second signal input pin is used for receiving standard condition pulses.
6. The pulse signal output circuit according to claim 2, wherein the logical not module includes: the first current limiting submodule and the logic not circuit are connected;
the first current limiting submodule is connected between the signal receiving module and the logic not circuit; the logic not circuit is connected between the first current limiting submodule and the photoelectric coupler;
the first current limiting submodule receives the source pulse signal sent by the signal receiving module and carries out current limiting on the source pulse signal to obtain a current limiting signal;
the first current limiting submodule sends the current limiting signal to the logic not circuit;
and the logic not circuit carries out reverse processing on the current limiting signal to obtain and send the first sub-signal to the photoelectric coupler.
7. The pulse signal output circuit of claim 6, wherein the first current limiting submodule comprises: the circuit comprises a first resistor, a second resistor and a second capacitor;
the first resistor is connected between the signal receiving module and the logical not circuit;
the second resistor is connected between an input pin of the logical not circuit and the ground;
the second capacitor is connected between the input pin of the logical not circuit and ground.
8. The pulse signal output circuit according to claim 6, wherein the logical not module further comprises: a third resistor, a third capacitor and a fourth capacitor;
the third resistor is arranged between a power supply pin of the logic not circuit and the first power supply;
the third capacitor is arranged between the first power supply and the ground;
the fourth capacitor is arranged between the output pin of the logic not circuit and the ground.
9. The pulse signal output circuit according to claim 2, characterized in that the circuit further comprises: a first current limiting resistor; the photoelectric coupler comprises a light emitting component and a light receiving component;
the first current limiting resistor is connected between the first end of the light emitting component and a first power supply;
the logic negation module is connected with the second end of the light-emitting component;
the first end of the light receiving component is connected with an external power supply, and the second end of the light receiving component is connected with the signal conversion module.
10. The pulse signal output circuit according to claim 9, characterized by comprising: a fourth resistor and a fifth resistor;
a first end of the fourth resistor is connected with an external power supply, and a second end of the fourth resistor is respectively connected with a first end of the fifth resistor, a second end of the light receiving component and the signal conversion module;
and the second end of the fifth resistor is connected with the ground.
11. The pulse signal output circuit according to claim 1 or 2, wherein the signal conversion module includes: a conversion output circuit;
the conversion output circuit is connected with the photoelectric coupler;
and the conversion output circuit receives the electric signal sent by the photoelectric coupler, converts the electric signal and obtains and outputs an output pulse signal corresponding to the source pulse signal.
12. The pulse signal output circuit according to claim 11, wherein the conversion output circuit includes: p-type field effect transistor, N-type field effect transistor;
the photoelectric coupler is respectively connected with the grid electrode of the P-type field effect transistor and the grid electrode of the N-type field effect transistor;
the drain electrode of the P-type field effect transistor is connected with the drain electrode of the N-type field effect transistor, and the connection position of the drain electrodes sends an output pulse signal outwards;
alternatively, the conversion output circuit includes: a P-type triode, an N-type triode;
the photoelectric coupler is respectively connected with the base electrode of the P-type triode and the base electrode of the N-type triode;
and the collector electrode of the P-type triode is connected with the collector electrode of the N-type triode, and the connection part sends an output pulse signal outwards.
13. The pulse signal output circuit according to claim 12, wherein the signal conversion module comprises: a fifth capacitor;
the junction of the drain electrode of the P-type field effect transistor and the drain electrode of the N-type field effect transistor is grounded through the fifth capacitor;
or the junction of the collector of the P-type triode and the collector of the N-type triode is connected through the fifth capacitor;
and/or, the signal receiving module comprises: a first capacitor;
the first capacitor is connected between a power supply pin and a grounding pin of a signal receiving chip in the signal receiving module, wherein the signal receiving chip is included in the signal receiving module.
14. The pulse signal output circuit according to claim 12, wherein the signal conversion module comprises: a second current limiting resistor and a sixth capacitor;
the source electrode of the P-type field effect transistor is connected with an external power supply through the second current limiting resistor;
the sixth capacitor is connected between the external power supply and ground.
15. The pulse signal output circuit according to claim 14, wherein the signal conversion module further comprises: a first bidirectional transient suppression diode and a voltage regulator tube;
the first bi-directional transient suppression diode is connected between the external power source and ground;
the voltage-stabilizing tube is connected between the external power supply and the ground.
16. The pulse signal output circuit according to claim 12, wherein the signal conversion module further comprises: a second bidirectional transient suppression diode;
and the second bidirectional transient suppression diode is connected between the drain electrode connection positions of the P-type field effect transistor and the N-type field effect transistor and the ground.
17. The pulse signal output circuit according to claim 3, wherein the external power supply collection module comprises an external lighting electric coupler, a second voltage-dividing sub-module;
the external power supply is connected with the second voltage-dividing sub-module, the second voltage-dividing sub-module is connected with the external lighting electric coupler, and the external lighting electric coupler is connected with the processor;
the external power supply sends a power supply signal to the second voltage division submodule;
the second voltage division submodule performs voltage division processing on the power supply signal to obtain and send a voltage division signal to the external lighting electric coupler;
and the external lighting electric coupler processes the received voltage division signal to generate an optical signal, and then sends the first reference signal or the second reference signal to the processor according to the optical signal.
18. The pulse signal output circuit according to claim 17, wherein the external power supply collection module further comprises: a pull-up resistor;
the output end of the external lighting electric coupler is connected with a first power supply through the pull-up resistor;
when the external power supply does not supply power, the external lighting electric coupler sends a voltage signal corresponding to the first power supply to the processor.
19. The pulse signal output circuit according to claim 18, wherein the external power supply collection module further comprises: a seventh capacitor and an eighth capacitor;
the seventh capacitor is connected between the pull-up resistor and ground;
the eighth capacitor is connected between the external daylighting electric coupler and ground.
20. A flow meter, comprising: a pulse signal output circuit as claimed in any one of claims 1 to 19.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023104660.4U CN214251201U (en) | 2020-12-21 | 2020-12-21 | Pulse signal output circuit and flowmeter |
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| CN202023104660.4U CN214251201U (en) | 2020-12-21 | 2020-12-21 | Pulse signal output circuit and flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595392A (en) * | 2020-12-21 | 2021-04-02 | 金卡智能集团股份有限公司 | Pulse signal output circuit and flowmeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595392A (en) * | 2020-12-21 | 2021-04-02 | 金卡智能集团股份有限公司 | Pulse signal output circuit and flowmeter |
| WO2022135024A1 (en) * | 2020-12-21 | 2022-06-30 | 金卡智能集团股份有限公司 | Pulse signal output circuit and flowmeter |
| GB2617511A (en) * | 2020-12-21 | 2023-10-11 | Goldcard Smart Group Co Ltd | Pulse signal output circuit and flowmeter |
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Effective date of registration: 20231026 Address after: 325600 291 weft seventeen Road, Yueqing Economic Development Zone, Wenzhou, Zhejiang Patentee after: Goldcard Smart Group Co.,Ltd. Patentee after: Tancy Instrument Group Co.,Ltd. Address before: 325600 291 weft seventeen Road, Yueqing Economic Development Zone, Wenzhou, Zhejiang Patentee before: Goldcard Smart Group Co.,Ltd. |