Communication module and flow meter

Abstract

The utility model discloses a communication module and a flowmeter. The communication module comprises an output end, a first signal processing unit and a second signal processing unit. Wherein the first signal processing unit comprises a first transistor and a control unit, the control unit is connected with a first switch control signal or a pulse signal to generate a corresponding control signal based on the control of the first switch control signal or the pulse signal, and a first end of the first transistor is connected with a power supply voltage; the control end of the first transistor is connected with the control unit, and the second end of the first transistor is connected with the output end to generate a first output signal at the output end based on the control of the control signal. The second signal processing unit generates a second output signal at the output end based on the control of the second switching control signal. According to the communication module and the flowmeter, the first signal processing unit and the second signal processing unit are arranged, real-time early warning of NPN / PNP switching value signals is achieved, and the communication module and the flowmeter can be compatible with pulse signals to transmit data such as flow, temperature and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of flow monitoring, and particularly relates to a communication module and a flowmeter. Background Art

[0002] The flowmeter is a relatively popular flow detection instrument in the chemical industry, and is mostly used for measuring the flow of medium fluids such as gases, liquids, and vapors in industrial production. After continuous development, the flowmeter has been widely used in industrial production processes, energy metering, environmental protection projects, transportation, metallurgy and electricity, coal and chemical industries, construction and transportation, food and agriculture, etc. At present, the flowmeters used in the market have higher and higher requirements for the performance and integration of flow warning and pulse communication. The traditional warning circuit uses relays and mechanical switches to turn on and off for warning protection, which has defects such as a large number of peripheral devices, excessive space occupation, slow response, and large errors. With the continuous development of industrial control technology, the software-controlled transistor switch warning circuit is applied in the field of flowmeters. All existing manufacturers such as FESTO, CKD, IFM, and SMC have adopted such switch circuits without exception. However, the transistor switch warning circuit still has problems such as weak load-carrying capacity, inability to be reused as a pulse signal output, and weak EMC and reliability.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a communication module and a flowmeter, which can solve the problem that the warning circuit and the pulse communication circuit in the traditional flowmeter cannot be reused.

[0005] To achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows: A communication module, comprising: an output end; a first signal processing unit, including a first transistor and a control unit, the control unit is connected to a first switch control signal or a pulse signal to generate a corresponding control signal based on the control of the first switch control signal or the pulse signal, a first end of the first transistor is connected to a power supply voltage, a control end of the first transistor is connected to the control unit, and a second end of the first transistor is connected to the output end to generate a first output signal at the output end based on the control of the control signal; a second signal processing unit, connected to a second switch control signal and the output end to generate a second output signal at the output end based on the control of the second switch control signal.

[0006] In one or more embodiments of the present utility model, the control unit includes a second transistor and a voltage dividing unit. The control end of the second transistor is used to receive a pulse signal or a first switch control signal. The first end of the second transistor is connected to the ground voltage. The second end of the second transistor is connected to the power supply voltage through the voltage dividing unit. The voltage dividing unit is connected to the control end of the first transistor. The voltage dividing unit is used to generate a control signal when the second transistor is turned on.

[0007] In one or more embodiments of the present utility model, the first signal processing unit further includes a first voltage regulating unit. The first voltage regulating unit is used to receive a pulse signal or a first switch control signal, and the first voltage regulating unit is simultaneously connected to the control unit to adjust the pulse signal or the first switch control signal and transmit it to the control unit; and / or the first signal processing unit further includes a first anti-backflow circuit. The first anti-backflow circuit is connected between the pulse signal and / or the first switch control signal and the control unit to prevent signal backflow.

[0008] In one or more embodiments of the present utility model, the first signal processing unit further includes a first resistor. The first end of the first resistor is connected to the second end of the first transistor, and the second end of the first resistor is connected to the output end; and / or the first signal processing unit further includes a second resistor. The first end of the second resistor is connected to the second end of the first transistor, and the second end of the second resistor is connected to the ground voltage; and / or the first signal processing unit further includes a first capacitor. The first end of the first capacitor is connected to the second end of the first transistor, and the second end of the first capacitor is connected to the ground voltage; and / or the first signal processing unit further includes a first diode. The first end of the first diode is connected to the second end of the first transistor, and the second end of the second transistor is connected to the output end.

[0009] In one or more embodiments of the present utility model, the second signal processing unit includes a third transistor. The control end of the third transistor is used to receive a second switch control signal. The first end of the third transistor is connected to the ground voltage. The second end of the third transistor is connected to the output end.

[0010] In one or more embodiments of the present utility model, the second signal processing unit further includes a third resistor. The first end of the third resistor is connected to the second end of the third transistor, and the second end of the third resistor is connected to the output end.

[0011] In one or more embodiments of the present utility model, the second signal processing unit further includes a second voltage regulation unit, which is configured to receive a second switch control signal, and the second voltage regulation unit is simultaneously connected to the control terminal of the third transistor to adjust the second switch control signal and transmit it to the control terminal of the third transistor; and / or the second signal processing unit further includes a second anti-backflow circuit, which is connected between the second switch control signal and the control terminal of the third transistor to prevent signal backflow.

[0012] In one or more embodiments of the present utility model, the communication module further includes one or more of a voltage regulation unit, a filtering unit, and an overcurrent protection unit, and the voltage regulation unit, the filtering unit, and the overcurrent protection unit are connected to the output terminal.

[0013] A specific embodiment of the present utility model further provides a flowmeter, which includes the above-mentioned communication module, control module, and sensor module. The sensor module is configured to generate a sampling signal, and the control module is connected to the sensor module and the communication module to generate a pulse signal, a first switch control signal, or a second switch control signal based on the sampling signal.

[0014] In one or more embodiments of the present utility model, the flowmeter further includes an EMC protection module and a power supply module. The EMC protection module is connected to the power supply module to provide electromagnetic protection for the power supply module, and the power supply module is configured to generate a power supply voltage.

[0015] Compared with the prior art, the communication module and the flowmeter of the present utility model, by setting the first signal processing unit and the second signal processing unit, not only realize the real-time early warning of NPN / PNP switch quantity signals, but also can be compatible with pulse signals to transmit data such as flow rate and temperature, enhance the signal quality, improve the data acquisition and conversion accuracy, and have the advantages of low link internal resistance, strong load-carrying capacity, low signal delay, and strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the circuit schematic diagram of the communication module in Embodiment 1 of the present utility model.

[0018] Figure 2 It is the circuit schematic diagram of the communication module in Embodiment 2 of the present utility model.

[0019] Figure 3 This is the system structure diagram of the flowmeter in Embodiment 3 of the present utility model.

[0020] Figure 4 This is the circuit diagram of the power supply module and the EMC protection module in Embodiment 3 of the present utility model.

[0021] Figure 5 This is the circuit diagram of the control module in Embodiment 3 of the present utility model. Detailed implementation manners

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] "Coupled" or "connected" or "linked" in the specification includes both direct connection and indirect connection. Indirect connection is a connection through an intermediate medium, such as a connection through an electrical conduction medium, which may have parasitic inductance or parasitic capacitance; indirect connection may also include a connection through other active devices or passive devices on the basis of achieving the same or similar functional purposes, such as a connection through circuits or components such as switches and follower circuits. In addition, in the invention, words such as "first" and "second" are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity or order between these technical features.

[0024] In the detailed description of the specification, reference is made to the accompanying drawings that form a part of it, in which the same reference numerals always represent the same components, and which are shown by way of exemplary embodiments that can be implemented. It should be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present disclosure. Therefore, the following detailed description should not be regarded as limiting.

[0025] The various operations in the specification can be described as a plurality of discrete actions or operations in the order that is most helpful for understanding the claimed subject matter. However, the described order should not be construed as implying that these operations must be order-related. Specifically, these operations may not be performed in the order presented. The described operations can be performed in an order different from that of the described embodiments. Various additional operations can be performed in additional embodiments and / or the described operations can be omitted.

[0026] For the purposes of the present disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of the present disclosure, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C).

[0027] Various components and devices may be referred to or shown herein in the singular form (e.g., "MOS transistor", "transistor", "switch", etc.), but this is merely for convenience of discussion, and any element referred to in the singular may include a plurality of such elements in accordance with the teachings herein.

[0028] The specification describes the use of the phrases "in one embodiment", "in other embodiments", or "in some embodiments", which may each refer to one or more of the same or different embodiments. In addition, the terms "comprising", "including", "having", etc. used with respect to the embodiments of the present disclosure are synonymous.

[0029] Embodiment 1

[0030] As Figure 1 shown, the communication module in one embodiment of the present utility model includes an output terminal OUT, a first signal processing unit 10, a second signal processing unit 20, a voltage stabilizing unit, and an overcurrent protection unit.

[0031] Among them, the first signal processing unit 10 includes a first voltage regulating unit, a first anti-backflow circuit, a control unit 11, a first transistor M1, a first resistor R1, and a second resistor R2. The first voltage regulating unit is used to receive a pulse signal PWM or a first switch control signal PNP, and the first voltage regulating unit is simultaneously connected to the control unit 11 to regulate the pulse signal PWM or the first switch control signal PNP and deliver it to the control unit 11. The first anti-backflow circuit is connected between the pulse signal PWM and the first switch control signal PNP and the control unit 11 to prevent signal backflow.

[0032] The control unit 11 generates a corresponding control signal based on the control of the first switch control signal PNP or the pulse signal PWM. The first end of the first transistor M1 is connected to the power supply voltage VCC, the control end of the first transistor M1 is connected to the control unit 11, and the second end of the first transistor M1 is connected to the output terminal OUT to generate a first output signal at the output terminal OUT based on the control of the control signal.

[0033] The second signal processing unit 20 is connected to the second switch control signal NPN and the output terminal OUT to generate a second output signal at the output terminal OUT based on the second switch control signal NPN. The voltage stabilizing unit and the overcurrent protection unit are connected to the output terminal OUT.

[0034] In one embodiment, the pulse signal PWM is generated in the pulse communication mode and is a PWM signal. The pulse signal PWM represents the real-time monitoring data (such as flow rate, temperature, etc.) of the pre-stage device through different frequencies. The first switch control signal PNP is generated in the PNP warning mode and is a PNP digital signal. The second switch control signal NPN is generated in the NPN warning mode and is an NPN digital signal. Both the first switch control signal PNP and the second switch control signal NPN are used to represent whether the monitored quantity exceeds the set single-point value or range value. The pulse signal PWM, the first switch control signal PNP, and the second switch control signal NPN are not generated simultaneously.

[0035] As Figure 1 shown, the first voltage regulation unit includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first anti-backflow circuit includes a third diode D3 and a fourth diode D4. The first end of the fourth resistor R4 is connected to the pulse signal PWM, and the second end of the fourth resistor R4 is connected to the first end (anode) of the third diode D3. The first end of the fifth resistor R5 is connected to the first switch control signal PNP, and the second end of the fifth resistor R5 is connected to the first end (anode) of the fourth diode D4. The second end (cathode) of the third diode D3, the second end (cathode) of the fourth diode D4, and the first end of the sixth resistor R6 are connected to the control unit 11, and the second end of the sixth resistor R6 is connected to the ground voltage GND.

[0036] The fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 regulate the pulse signal PWM and the first switch control signal PNP through voltage division. The third diode D3 and the fourth diode D4 are used to prevent current backflow from damaging the pre-stage circuit.

[0037] As Figure 1 shown, the control unit 11 includes a second transistor M2 and a voltage division unit. The control end of the second transistor M2 is connected to the first end of the sixth resistor R6. The first end of the second transistor M2 is connected to the ground voltage GND, and the second end of the second transistor M2 is connected to the power supply voltage VCC through the voltage division unit. The voltage division unit is connected to the control end of the first transistor M1 and is used to generate a control signal when the second transistor M2 is turned on.

[0038] Specifically, the voltage division unit includes a seventh resistor R7 and an eighth resistor R8. The first end of the seventh resistor R7 is connected to the second end of the second transistor M2. The second end of the seventh resistor R7 and the first end of the eighth resistor R8 are connected to the control end of the first transistor M1, and the second end of the eighth resistor R8 is connected to the power supply voltage VCC. The seventh resistor R7 and the eighth resistor R8 regulate the conduction voltage of the first transistor M1 through voltage division.

[0039] The first end of the first resistor R1, the first end of the second resistor R2 are connected to the second end of the first transistor M1. The second end of the first resistor R1 is connected to the output terminal OUT, and the second end of the second resistor R2 is connected to the ground voltage GND. The first resistor R1 is used to limit the current magnitude of the first output signal. The resistance value of the second resistor R2 is relatively large, generally 100 KΩ, which functions as a debugging pull-down resistor and for protection. The two ends of the second resistor R2 can be regarded as an open circuit.

[0040] As Figure 1 shown, the second signal processing unit 20 includes a second voltage regulation unit, a second anti-backflow circuit, a third transistor M3, and a third resistor R3.

[0041] Among them, the second voltage regulation unit is used to receive the second switch control signal NPN, and the second voltage regulation unit is simultaneously connected to the control end of the third transistor M3 to adjust the second switch control signal NPN and transmit it to the control end of the third transistor M3. The first end of the third transistor M3 is connected to the ground voltage GND, the second end of the third transistor M3 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the output terminal OUT.

[0042] As Figure 1 shown, the second voltage regulation unit includes a ninth resistor R9 and a tenth resistor R10, and the second anti-backflow circuit includes a fifth diode D5.

[0043] The first end of the ninth resistor R9 is connected to the second switch control signal NPN, the second end of the ninth resistor R9 is connected to the first end (anode) of the fifth diode D5, the second end (cathode) of the fifth diode D5 and the first end of the tenth resistor R10 are connected to the control end of the third transistor M3, and the second end of the tenth resistor R10 is connected to the ground voltage GND. The ninth resistor R9 and the tenth resistor R10 adjust the conduction voltage of the third transistor M3 through voltage division. The fifth diode D5 is used to prevent current backflow from damaging the previous-stage circuit.

[0044] As Figure 1 shown, the voltage regulation unit includes a second diode D2, and the overcurrent protection unit includes a fuse F1. The first end (anode) of the second diode D2 is connected to the ground voltage GND, the second end (cathode) of the second diode D2 and the first end of the fuse F1 are connected to the second end of the first resistor R1 and the second end of the third resistor R3, and the second end of the fuse F1 is connected to the output terminal OUT. The second diode D2 is preferably a TVS tube, and the fuse F1 is preferably a self-resetting fuse F1, which can be forced to open when the current in the circuit exceeds the threshold.

[0045] In one embodiment, the power supply voltage VCC is provided by a switchable power supply with a wide voltage range, and the power supply voltage VCC can be selected as 5V or 23.4V.

[0046] In one embodiment, the first transistor M1 is a PMOS transistor, and the second transistor M2 and the third transistor M3 are NMOS transistors. In other embodiments, the first transistor M1 can also be an NMOS transistor or other device, and the second transistor M2 and the third transistor M3 can also be PMOS transistors or other devices. Then, the connection manner of the above-mentioned transistors is adjusted adaptively. The first ends of the first transistor M1, the second transistor M2, and the third transistor M3 are source electrodes, the second ends of the first transistor M1, the second transistor M2, and the third transistor M3 are drain electrodes, and the control ends of the first transistor M1, the second transistor M2, and the third transistor M3 are gate electrodes.

[0047] The first transistor M1, the second transistor M2, and the third transistor M3 are preferably transistors with low on-resistance, so as to reduce the internal resistance of the circuit and improve the load-carrying capacity of the backend.

[0048] In the pulse communication mode, the front-stage circuit generates a pulse signal PWM. When the pulse signal PWM is at a high level, the second transistor M2 is turned on, the voltage at the control end of the first transistor M1 is pulled down to the ground voltage GND, and the first transistor M1 is also turned on, generating a first output signal at a high level. When the pulse signal PWM is at a low level, the second transistor M2 is turned off, the voltage at the control end of the first transistor M1 is pulled up to the power supply voltage VCC, and the first transistor M1 is turned off, generating a first output signal at a low level. The first signal processing unit 10 does not change the frequency and waveform of the pulse signal PWM, but only adjusts the amplitude of the signal, so that the first output signal can be recognized by the backend circuit, and the monitoring information is obtained in real time by analyzing the frequency of the first output signal. After debugging and verification, the first output signal output by this circuit has the advantages of basically no waveform distortion, high communication frequency, and wide load impedance range compared with the original pulse signal PWM, making the accuracy of the transmitted converted flow or temperature signal relatively high.

[0049] In the PNP warning mode, the pre-stage circuit generates the first switch control signal PNP. When the first switch control signal PNP is at a high level, the second transistor M2 is turned on, and the control terminal voltage of the first transistor M1 is pulled down to the ground voltage GND, and the first transistor M1 is also turned on, generating a high-level first output signal. When the first switch control signal PNP is at a low level, the second transistor M2 is turned off, and the control terminal voltage of the first transistor M1 is pulled up to the power supply voltage VCC, and the first transistor M1 is turned off, generating a low-level first output signal. The first signal processing unit 10 also does not change the frequency and waveform of the first switch control signal PNP, but only adjusts the amplitude of the signal, so that the back-end circuit can obtain whether the flow rate exceeds the set range based on the high and low levels of the first output signal in this mode, and gives an early warning in time. After debugging and verification, the first output signal output by this circuit has the advantages of basically no waveform distortion, high communication frequency, and wide load impedance range compared with the first switch control signal PNP, improving the load-carrying capacity and signal quality, making the flow rate monitoring and early warning timely, accurate, and highly reliable.

[0050] In the NPN warning mode, the pre-stage circuit generates the second switch control signal NPN. When the second switch control signal NPN is at a high level, the third transistor M3 is turned on, generating a low-level (0V) second output signal. When the second switch control signal NPN is at a low level, the third transistor M3 is turned off, generating a disconnected second output signal. The second signal processing unit 20 converts the high / low level second switch control signal NPN into a second output signal of 0V and disconnected, so that the back-end circuit can obtain whether the flow rate exceeds the set range based on the two different states of 0V and disconnected of the second output signal in this mode, and gives an early warning in time. After debugging and verification, the second output signal output by this circuit has the advantages of low link internal resistance, strong load-carrying capacity, and low signal delay.

[0051] In summary, the communication module of this solution not only realizes the real-time warning of NPN / PNP digital quantity signals, but also can be compatible with the pulse signal PWM to transmit data such as flow rate and temperature, enhances the signal quality, and improves the data conversion accuracy. At the same time, by selecting transistors with low on-resistance, the internal resistance from the power supply to the output terminal is reduced, and the loop internal resistance is reduced, etc. to improve the load-carrying capacity.

[0052] Embodiment 2

[0053] Such as Figure 2As shown, the difference between the communication module of this embodiment and that of Embodiment 1 is that the first signal processing unit 10 in this embodiment only generates a first output signal based on the first switch control signal PNP, without involving the processing of the pulse signal PWM. Therefore, the fourth resistor R4 and the third diode D3 are not provided. At the same time, the first signal processing unit 10 further includes a first capacitor C1 and a first diode D1. And the communication module of this embodiment further includes a filtering unit connected to the output terminal OUT.

[0054] Among them, the first end of the first capacitor C1 and the first end (anode) of the first diode D1 are connected to the second end of the first resistor R1. The second end of the first capacitor C1 is connected to the ground voltage GND. The second end (cathode) of the first diode D1 is connected to the second end of the third resistor R3.

[0055] The filtering unit includes a second capacitor C2. The first end of the second capacitor C2 is connected to the first end of the fuse F1. The second end of the second capacitor C2 is connected to the ground voltage GND.

[0056] By setting the first capacitor C1, the second capacitor C2 and the first diode D1, the filtering effect on the signal can be improved and the protection can be strengthened. Since the first signal processing unit 10 and the second signal processing unit 20 in this embodiment only process NPN / PNP digital quantity level signals and do not involve the pulse signal PWM with frequency change, the above-mentioned devices will not affect the waveform of the digital quantity signal. These devices are not provided in Embodiment 1 to avoid distortion of the pulse signal PWM and improve the control accuracy.

[0057] The other circuit structures and working principles in this embodiment are the same as those in Embodiment 1 and will not be elaborated here.

[0058] Embodiment 3

[0059] As Figure 3 shown, this embodiment provides a flowmeter, including a sensor module 40, a signal processing module 50, a control module 60, an output module 70, a storage module 81, a display module 82, an EMC protection module 91, a power supply module 92, and the communication module 31 in Embodiment 1 and the communication module 32 in Embodiment 2.

[0060] Among them, the pulse signal PWM, the first switch control signal PNP, and the second switch control signal NPN received by the communication module 31 are all flow-related signals. The first switch control signal PNP and the second switch control signal NPN received by the communication module 32 are all temperature-related signals. After the communication module 31 and the communication module 32 process the signals accordingly, they are output to an external PLC or other devices.

[0061] The sensor module 40 is used to generate sampling signals. The sensor module 40 includes a stress type vortex flow sensor and a temperature sensor. The stress type vortex flow sensor can accurately collect flow data, and the sampling signals include flow information and temperature information.

[0062] The signal processing module 50 is connected to the sensor and the control module 60. The signal processing module 50 is used to amplify and filter the sampling signals to make them signals suitable for processing by the control module 60.

[0063] The control module 60 generates a pulse width modulation (PWM) signal, a first switch control signal PNP, and a second switch control signal NPN based on the sampling signals. Specifically, the control module 60 generates flow-related PWM signal, first switch control signal PNP, and second switch control signal NPN based on the flow information in the sampling signals and transmits them to the communication module 31. The control module 60 generates temperature-related first switch control signal PNP and second switch control signal NPN based on the temperature information in the sampling signals and transmits them to the communication module 32.

[0064] The control module 60 is also used to convert the sampling signals into sampling data, that is, convert the flow information into flow data and convert the temperature information into temperature data.

[0065] The display module 82 is connected to the control module 60. The display module 82 displays the sampling data based on the control of the control module 60. Specifically, the display module 82 includes an LCD display module, an LED indication module, and a key control module 60. The LCD display module is used to display the flow data and temperature data. The LED indication module, and the key control module 60 is used to control the LCD display module and the LED indication module.

[0066] The storage module 81 is connected to the control module 60. The storage module is used to store the flow data and temperature data.

[0067] The output module 70 is connected to the control module 60. The output module 70 is used to convert the flow data and temperature data into analog signals, such as current signals or voltage signals, and output them externally.

[0068] The EMC protection module 91 is connected to the power supply module 92 to provide electromagnetic protection for the power supply module 92. The power supply module 92 is used to generate a power supply voltage VCC.

[0069] As Figure 4 shown, the power supply module 92 includes a voltage conversion chip and its peripheral circuits. Among them, the voltage conversion chip is PW2312A, which is used to convert the 23.4V voltage into the 5V power supply voltage required by the control module 60, communication module and other modules.

[0070] The EMC protection module 91 includes an air discharge tube TVI, a varistor L5, a TVS tube L4, a differential mode inductor L3, a differential mode inductor L4, and a common mode inductor L2, enabling the entire system to have a strong load-carrying capacity, functions such as over-current and over-voltage protection, EMC protection, etc., and relatively good reliability.

[0071] In one embodiment, the power supply module 92 uses an FPC power soft cable, an FPC sensor soft cable, and a shielded cable with anti-static plastic threads and electromagnetic interference prevention as connecting wires, further improving the EMC protection ability of the system.

[0072] As Figure 5 shown, the control module 60 includes an MCU chip and its peripheral circuits, where the MCU chip is STM32F4.

[0073] The flowmeter in this solution realizes real-time early warning of flow and temperature signals with NPN / PNP digital signals, and is compatible with pulse communication signals to transmit data such as flow and temperature. The load-carrying capacity is enhanced, and the over-current, over-voltage, and EMC protection performances are strong.

[0074] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0075] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A communication module, characterized in that: include: Output terminal; A first signal processing unit, comprising a first transistor and a control unit, wherein the control unit is connected to a first switch control signal or a pulse signal to generate a corresponding control signal based on the control of the first switch control signal or the pulse signal, a first end of the first transistor is connected to a power supply voltage, a control end of the first transistor is connected to the control unit, and a second end of the first transistor is connected to an output end to generate a first output signal at the output end based on the control of the control signal; The second signal processing unit is connected to the second switch control signal and the output end to generate a second output signal at the output end based on the control of the second switch control signal.

2. The communication module according to claim 1, characterized in that: The control unit includes a second transistor and a voltage divider unit, the control end of the second transistor is used to receive a pulse signal or a first switch control signal, the first end of the second transistor is connected to the ground voltage, the second end of the second transistor is connected to the power supply voltage through the voltage divider unit, the voltage divider unit is connected to the control end of the first transistor, and the voltage divider unit is used to generate a control signal when the second transistor is turned on.

3. The communication module according to claim 1, characterized in that: The first signal processing unit further includes a first voltage regulating unit, which is used to receive the pulse signal or the first switch control signal, and the first voltage regulating unit is simultaneously connected to the control unit to regulate the pulse signal or the first switch control signal and transmit it to the control unit; and / or The first signal processing unit further includes a first anti-backflow circuit, which is connected between the pulse signal and / or the first switch control signal and the control unit to prevent signal backflow.

4. The communication module according to claim 1, characterized in that: The first signal processing unit further includes a first resistor, a first end of the first resistor is connected to the second end of the first transistor, and a second end of the first resistor is connected to the output end; and / or The first signal processing unit further includes a second resistor, a first end of the second resistor is connected to the second end of the first transistor, and a second end of the second resistor is connected to a ground voltage; and / or The first signal processing unit further includes a first capacitor, a first end of the first capacitor is connected to the second end of the first transistor, and a second end of the first capacitor is connected to a ground voltage; and / or The first signal processing unit further includes a first diode, a first end of the first diode is connected to the second end of the first transistor, and a second end of the first diode is connected to the output end.

5. The communication module according to claim 1, characterized in that: The second signal processing unit includes a third transistor, a control terminal of the third transistor is used to receive a second switch control signal, a first terminal of the third transistor is connected to a ground voltage, and a second terminal of the third transistor is connected to an output terminal.

6. The communication module according to claim 5, characterized in that: The second signal processing unit further includes a third resistor, a first end of the third resistor is connected to the second end of the third transistor, and a second end of the third resistor is connected to the output end.

7. The communication module according to claim 5, characterized in that: The second signal processing unit further includes a second voltage regulating unit, the second voltage regulating unit is used to receive the second switch control signal, and the second voltage regulating unit is simultaneously connected to the control end of the third transistor to regulate the second switch control signal and transmit it to the control end of the third transistor; and / or The second signal processing unit further includes a second anti-backflow circuit, which is connected between the second switch control signal and the control terminal of the third transistor to prevent signal backflow.

8. The communication module according to claim 1, characterized in that: The communication module further includes one or more of a voltage stabilizing unit, a filtering unit and an overcurrent protection unit, and the voltage stabilizing unit, the filtering unit and the overcurrent protection unit are connected to the output end.

9. A flow meter, characterized in that: It comprises the communication module, control module and sensor module according to any one of claims 1 to 8, wherein the sensor module is used to generate a sampling signal, and the control module is connected to the sensor module and the communication module to generate a pulse signal or a first switch control signal or a second switch control signal based on the sampling signal.

10. The flow meter according to claim 9, characterized in that The flow meter further comprises an EMC protection module and a power supply module. The EMC protection module is connected to the power supply module to provide electromagnetic protection for the power supply module. The power supply module is used to generate a power supply voltage.

Images