Two-wire system vibration transmitter based on HART protocol

Abstract

The utility model discloses a vibration transmitter, belongs to the technical field of instruments and meters, and particularly relates to a two-wire system vibration transmitter based on an HART protocol, which comprises a magnetoelectric vibration sensor, a vibration signal processing module, a master control CPU, a current output module and a communication module. The magnetoelectric vibration sensor collects signals, the output end of the magnetoelectric vibration sensor is connected with the input end of the vibration signal processing module, the main control CPU is connected with the output end of the vibration signal processing module, the current output module and the communication module are connected with the main control CPU, and the current output module is connected with the communication module. According to the utility model, the field programmability of the measuring range is realized through the HART protocol, a user can freely adjust the measuring range according to actual requirements, the requirement of frequently replacing a transmitter due to mismatching of the measuring range is avoided, the long-term operation cost is reduced, the operation process of measuring range adjustment is simplified, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a vibration transducer belongs to the instrument and meter technical field, concretely relates to a two -wire system vibration transducer based on HART protocol. BACKGROUND

[0002] In the industrial automation field, vibration transducer as the key state monitoring equipment, is widely used in the vibration measurement and fault diagnosis of rotary machinery (such as motor, pump, fan etc.). The traditional passive vibration transducer is usually based on 4-20mA analog signal output, and its range (such as 0-10mm / s or 0-20mm / s) is fixedly configured by hardware circuit (such as voltage dividing resistance, filter parameter) when leaving factory. This limitation brings many inconveniences to practical application, especially when facing different working conditions and measurement requirements, users often need to purchase a variety of range transducers for selection, which undoubtedly increases the cost and management difficulty.

[0003] In recent years, although part of the manufacturers try to realize range adjustable through increasing digital interface (such as RS-485), but this kind of scheme needs additional wiring and is incompatible with mainstream industrial protocol, which limits its popularization. In contrast, HART (Highway Addressable Remote Transducer) protocol as a kind of mixed analog and digital signal communication standard, can superimpose digital modulation signal while reserving 4-20mA analog signal, and provides two-way communication ability for intelligent instrument. However, the low power consumption characteristics of HART protocol and passive vibration transducer have not been effectively combined in the prior art, resulting in difficulty in realizing remote parameter configuration and range self-adaptive function.

[0004] Therefore, it is urgent to need a passive vibration transducer supporting field programmable range, which realizes remote parameter adjustment through HART protocol, improves the flexibility of the equipment while ensuring power supply compatibility, so as to reduce the whole life cycle maintenance cost and enhance the intelligent level of monitoring system. UTILITY MODEL CONTENTS

[0005] The utility model discloses a vibration transducer belongs to the instrument and meter technical field, concretely relates to a two -wire system vibration transducer based on HART protocol.

[0006] Technical scheme: a two -wire system vibration transducer based on HART protocol, the vibration transducer includes: magneto electric vibration sensor, vibration signal processing module, main control CPU, current output module and communication module;

[0007] The magnetoelectric vibration sensor acquires signals and its output terminal is connected to the input terminal of the vibration signal processing module. The main control CPU is connected to the output terminal of the vibration signal processing module. The current output module and the communication module are connected to the main control CPU, and the current output module is connected to the communication module.

[0008] In a further embodiment, the current output module and the output terminal of the communication module are connected to a host PLC.

[0009] In a further embodiment, the vibration signal processing module includes: capacitor C37, capacitor C38, resistor R42, resistor R41, resistor R43, resistor R44, amplifier IC5A, capacitor C31, resistor R31, capacitor C35, resistor R33, resistor R45, amplifier IC5D, capacitor C32, and resistor R34.

[0010] One end of capacitor C38 is connected to one end of resistor R42 and is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C38 is connected to one end of resistor R41 and the negative terminal of capacitor C37. The positive terminal of capacitor C37 is connected to the input signal of the magnetoelectric vibration sensor. Pin 2 of amplifier IC5A is simultaneously connected to the other end of resistor R42 and one end of resistor R43. Pin 3 of amplifier IC5A is simultaneously connected to the other end of resistor R41 and one end of resistor R44. The other end of resistor R44 is grounded. Pin 1 of amplifier IC5A is simultaneously connected to the other end of resistor R43 and one end of capacitor C31. One end of resistor R31 is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C31 is connected to the amplifier IC5D. Pin 13 of the amplifier IC5D is simultaneously connected to the other end of resistor R31, one end of capacitor C35, and one end of resistor R33. Pin 12 of the amplifier IC5D is connected to one end of resistor R45, and the other end of resistor R45 is grounded. Pin 4 of the amplifier IC5D receives a 3.3V voltage, and pin 11 of the amplifier IC5D receives a -3.3V voltage. Pin 14 of the amplifier IC5D is simultaneously connected to the other end of capacitor C35, the other end of resistor R33, and the positive terminal of capacitor C32. One end of resistor R34 is connected to the negative terminal of capacitor C32, and the other end is connected to the output signal of the main control CPU.

[0011] In a further embodiment, the main control CPU is composed of a single-chip microcomputer IC1.

[0012] In a further embodiment, the current output module includes: a digital-to-analog converter IC4, capacitors C17, C16, C21, C20, C19, C18, and C22, a resistor R6, a capacitor C12, a MOSFET Q1, and a capacitor C24.

[0013] Pin 1 of the digital-to-analog converter IC4 is connected to one end of capacitor C17; pins 2 and 3 are connected to one end of capacitor C16; the other ends of capacitors C17 and C16 are grounded. Pins 16 and 15 of the digital-to-analog converter IC4 are connected to one end of capacitor C21; the other end of capacitor C21 is grounded. Pin 10 of the digital-to-analog converter IC4 is connected to one end of capacitor C20; the other end of capacitor C20 is grounded. Pin 11 of the digital-to-analog converter IC4 is connected to one end of capacitor C19; the other end of capacitor C19 is grounded. Pin 12 of the digital-to-analog converter IC4 is connected to one end of capacitor C18; the other end of capacitor C18 is grounded. Pin 14 of the digital-to-analog converter IC4 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to one end of resistor R6 and to pin 13 of the digital-to-analog converter IC4. One end of capacitor C23 is connected to the other end of resistor R6, and the other end is grounded. Pin 2 of MOSFET Q1 is connected to the communication module. Pin 1 of MOSFET Q1 is connected to pin 13. Pin 3 of MOSFET Q1 is connected to one end of capacitor C24 and to pin 16 of the digital-to-analog converter IC4. The other end of capacitor C24 is connected to pin 4 of the digital-to-analog converter IC4. Pins 5, 6, and 7 of the digital-to-analog converter IC4 are connected to microcontroller IC1.

[0014] In a further embodiment, the communication module includes: HART modem IC2, crystal oscillator Y1, capacitor C4, capacitor C5, capacitor E5, capacitor E6, capacitor C11, capacitor C13, capacitor E3, capacitor E4, capacitor C8, capacitor C9, capacitor C10, resistor R3, resistor R5, interface P1, interface P20, and bridge rectifier QD1.

[0015] Pin 1 of crystal oscillator Y1 is simultaneously connected to pin 21 of HART modem IC2 and one end of capacitor C4; pin 2 of crystal oscillator Y1 is simultaneously connected to pin 20 of HART modem IC2 and one end of capacitor C5; the other ends of capacitor C4 and C5 are grounded; pin 18 of HART modem IC2 is simultaneously connected to one end of capacitor E5 and one end of capacitor E6 and receives an input voltage; the other ends of capacitor E5 and E6 are grounded; pin 14 of HART modem IC2 is simultaneously connected to one end of capacitor C11; the other end of capacitor C11 is connected to pin 10 of digital-to-analog converter IC4; pin 13 of HART modem IC2 is connected to one end of capacitor C13; the other end of capacitor C13 is grounded; pin 11 of HART modem IC2 is simultaneously connected to... One end of capacitor E3 is connected to one end of capacitor E4, and the other ends of capacitor E3 and capacitor E4 are grounded. Pin 15 of HART modem IC2 is simultaneously connected to one end of capacitor C8 and one end of resistor R3. Pin 17 of HART modem IC2 is simultaneously connected to the other ends of resistor R3, resistor R4, and capacitor C9. One end of capacitor C10 is simultaneously connected to the other end of capacitor C9 and resistor R5. The other ends of capacitor C8, resistor R4, and capacitor C10 are grounded. The output of interface P1 is connected to the input of bridge rectifier QD1. The positive output of bridge rectifier QD1 is simultaneously connected to the other end of resistor R5 and pin 2 of MOSFET Q1, and the negative output is connected to pin 8 of digital-to-analog converter IC4. Interface P20 is connected to microcontroller IC1.

[0016] In a further embodiment, the vibration transmitter is provided with a power conversion module.

[0017] Compared with the existing two-wire vibration transmitters, this invention has the following advantages:

[0018] Adjustable range: The range is programmable in the field through the HART protocol, allowing users to freely adjust the range according to actual needs.

[0019] Cost savings: It avoids the need to frequently replace transmitters due to range mismatch, reducing long-term operating costs.

[0020] Easy to operate: The operation process for range adjustment is simplified, and work efficiency is improved. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is the circuit diagram of the vibration signal processing module of this utility model.

[0023] Figure 3 This is the main control CPU circuit diagram of this utility model.

[0024] Figure 4 This is the circuit diagram of the current output module of this utility model.

[0025] Figure 5 This is the circuit diagram of the communication module of this utility model.

[0026] Figure 6 This is the circuit diagram of the power conversion module of this utility model. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] A two-wire vibration transmitter based on the HART protocol, such as Figure 1As shown, it includes: a magnetoelectric vibration sensor, a vibration signal processing module, a main control CPU, a current output module, and a communication module;

[0031] The magnetoelectric vibration sensor acquires signals and its output terminal is connected to the input terminal of the vibration signal processing module. The main control CPU is connected to the output terminal of the vibration signal processing module. The current output module and the communication module are connected to the main control CPU, and the current output module is connected to the communication module.

[0032] In one embodiment, such as Figure 1 As shown, the output terminals of the current output module and the communication module are connected to the host PLC.

[0033] In one embodiment, such as Figure 2 As shown, the vibration signal processing module includes: capacitor C37, capacitor C38, resistor R42, resistor R41, resistor R43, resistor R44, amplifier IC5A, capacitor C31, resistor R31, capacitor C35, resistor R33, resistor R45, amplifier IC5D, capacitor C32, and resistor R34.

[0034] One end of capacitor C38 is connected to one end of resistor R42 and is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C38 is connected to one end of resistor R41 and the negative terminal of capacitor C37. The positive terminal of capacitor C37 is connected to the input signal of the magnetoelectric vibration sensor. Pin 2 of amplifier IC5A is simultaneously connected to the other end of resistor R42 and one end of resistor R43. Pin 3 of amplifier IC5A is simultaneously connected to the other end of resistor R41 and one end of resistor R44. The other end of resistor R44 is grounded. Pin 1 of amplifier IC5A is simultaneously connected to the other end of resistor R43 and one end of capacitor C31. One end of resistor R31 is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C31 is connected to the amplifier IC5D. Pin 13 of the amplifier IC5D is simultaneously connected to the other end of resistor R31, one end of capacitor C35, and one end of resistor R33. Pin 12 of the amplifier IC5D is connected to one end of resistor R45, and the other end of resistor R45 is grounded. Pin 4 of the amplifier IC5D receives a 3.3V voltage, and pin 11 of the amplifier IC5D receives a -3.3V voltage. Pin 14 of the amplifier IC5D is simultaneously connected to the other end of capacitor C35, the other end of resistor R33, and the positive terminal of capacitor C32. One end of resistor R34 is connected to the negative terminal of capacitor C32, and the other end is connected to the output signal of the main control CPU.

[0035] In one embodiment, such as Figure 3As shown, the main control CPU is composed of a single-chip microcomputer IC1.

[0036] In one embodiment, such as Figure 4 As shown, the current output module includes: digital-to-analog converter IC4, capacitors C17, C16, C21, C20, C19, C18, C22, resistor R6, capacitor C12, MOSFET Q1, and capacitor C24.

[0037] Pin 1 of the digital-to-analog converter IC4 is connected to one end of capacitor C17; pins 2 and 3 are connected to one end of capacitor C16; the other ends of capacitors C17 and C16 are grounded. Pins 16 and 15 of the digital-to-analog converter IC4 are connected to one end of capacitor C21; the other end of capacitor C21 is grounded. Pin 10 of the digital-to-analog converter IC4 is connected to one end of capacitor C20; the other end of capacitor C20 is grounded. Pin 11 of the digital-to-analog converter IC4 is connected to one end of capacitor C19; the other end of capacitor C19 is grounded. Pin 12 of the digital-to-analog converter IC4 is connected to one end of capacitor C18; the other end of capacitor C18 is grounded. Pin 14 of the digital-to-analog converter IC4 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to one end of resistor R6 and to pin 13 of the digital-to-analog converter IC4. One end of capacitor C23 is connected to the other end of resistor R6, and the other end is grounded. Pin 2 of MOSFET Q1 is connected to the communication module. Pin 1 of MOSFET Q1 is connected to pin 13. Pin 3 of MOSFET Q1 is connected to one end of capacitor C24 and to pin 16 of the digital-to-analog converter IC4. The other end of capacitor C24 is connected to pin 4 of the digital-to-analog converter IC4. Pins 5, 6, and 7 of the digital-to-analog converter IC4 are connected to microcontroller IC1.

[0038] In one embodiment, such as Figure 5 As shown, the communication module includes: HART modem IC2, crystal oscillator Y1, capacitors C4, C5, E5, E6, C11, C13, E3, E4, C8, C9, C10, resistors R3 and R5, interface P1, interface P20, and bridge rectifier QD1.

[0039] Pin 1 of crystal oscillator Y1 is simultaneously connected to pin 21 of HART modem IC2 and one end of capacitor C4; pin 2 of crystal oscillator Y1 is simultaneously connected to pin 20 of HART modem IC2 and one end of capacitor C5; the other ends of capacitor C4 and C5 are grounded; pin 18 of HART modem IC2 is simultaneously connected to one end of capacitor E5 and one end of capacitor E6 and receives an input voltage; the other ends of capacitor E5 and E6 are grounded; pin 14 of HART modem IC2 is simultaneously connected to one end of capacitor C11; the other end of capacitor C11 is connected to pin 10 of digital-to-analog converter IC4; pin 13 of HART modem IC2 is connected to one end of capacitor C13; the other end of capacitor C13 is grounded; pin 11 of HART modem IC2 is simultaneously connected to... One end of capacitor E3 is connected to one end of capacitor E4, and the other ends of capacitor E3 and capacitor E4 are grounded. Pin 15 of HART modem IC2 is simultaneously connected to one end of capacitor C8 and one end of resistor R3. Pin 17 of HART modem IC2 is simultaneously connected to the other ends of resistor R3, resistor R4, and capacitor C9. One end of capacitor C10 is simultaneously connected to the other end of capacitor C9 and resistor R5. The other ends of capacitor C8, resistor R4, and capacitor C10 are grounded. The output of interface P1 is connected to the input of bridge rectifier QD1. The positive output of bridge rectifier QD1 is simultaneously connected to the other end of resistor R5 and pin 2 of MOSFET Q1, and the negative output is connected to pin 8 of digital-to-analog converter IC4. Interface P20 is connected to microcontroller IC1.

[0040] In one embodiment, such as Figure 6 As shown, the vibration transmitter is equipped with a power conversion module.

[0041] Working principle: The vibration sensing unit of this utility model adopts a magnetoelectric vibration velocity sensor, which is responsible for converting mechanical vibration signals into charge signals.

[0042] HART communication module: integrates a HART modem chip (AD5700), supports mixed transmission of digital signals and 4-20mA analog signals, and realizes bidirectional communication.

[0043] Main control CPU: Based on low-power MCU (STM32L051), with built-in HART protocol stack control signal conditioning circuit parameters and processing digital commands.

[0044] The HART protocol is based on Frequency Shift Keying (FSK) modulation technology, superimposing digital communication signals onto a 4-20mA analog signal. The 4-20mA analog signal current loop is used to transmit the main measured values, compatible with traditional analog instruments. The digital signal, consisting of 1.2kHz (logic 1) and 2.2kHz (logic 0) sine wave signals superimposed on the analog signal, is used to transmit digital data such as device parameters and diagnostic information. During operation, the average power of the digital signal is close to zero, and it does not interfere with the DC component of the 4-20mA analog signal.

[0045] When a two-wire vibration transmitter based on the HART protocol is operating, the vibration sensor converts the signal into a DC voltage signal through the vibration signal processing module, which is then sent to the main control CPU. The processor's internal AD converter converts this signal into a digital quantity. The converted digital quantity is then processed by the CPU's internal algorithm and converted into both a digital HART protocol signal and a 4-20mA analog signal for transmission to the PLC or host computer. The main control CPU converts the calculated data into a 4-20mA analog signal output through the current output module's digital-to-analog converter. For the HART protocol portion, the main control unit controls the HART communication module, which is superimposed on the 4-20mA circuit for synchronous output.

[0046] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A two-wire vibration transmitter based on the HART protocol, characterized in that, The vibration transmitter includes: a magnetoelectric vibration sensor, a vibration signal processing module, a main control CPU, a current output module, and a communication module; The magnetoelectric vibration sensor acquires signals and its output terminal is connected to the input terminal of the vibration signal processing module. The main control CPU is connected to the output terminal of the vibration signal processing module. The current output module and the communication module are connected to the main control CPU, and the current output module is connected to the communication module.

2. The two-wire vibration transmitter based on the HART protocol according to claim 1, characterized in that, The current output module and the output terminal of the communication module are connected to the host PLC.

3. A two-wire vibration transmitter based on the HART protocol according to claim 1, characterized in that, The vibration signal processing module includes: capacitor C37, capacitor C38, resistor R42, resistor R41, resistor R43, resistor R44, amplifier IC5A, capacitor C31, resistor R31, capacitor C35, resistor R33, resistor R45, amplifier IC5D, capacitor C32, and resistor R34. One end of capacitor C38 is connected to one end of resistor R42 and is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C38 is connected to one end of resistor R41 and the negative terminal of capacitor C37. The positive terminal of capacitor C37 is connected to the input signal of the magnetoelectric vibration sensor. Pin 2 of amplifier IC5A is simultaneously connected to the other end of resistor R42 and one end of resistor R43. Pin 3 of amplifier IC5A is simultaneously connected to the other end of resistor R41 and one end of resistor R44. The other end of resistor R44 is grounded. Pin 1 of amplifier IC5A is simultaneously connected to the other end of resistor R43 and one end of capacitor C31. One end of resistor R31 is connected to the input signal of the magnetoelectric vibration sensor. The other end of capacitor C31 is connected to the amplifier IC5D. Pin 13 of the amplifier IC5D is simultaneously connected to the other end of resistor R31, one end of capacitor C35, and one end of resistor R33. Pin 12 of the amplifier IC5D is connected to one end of resistor R45, and the other end of resistor R45 is grounded. Pin 4 of the amplifier IC5D receives a 3.3V voltage, and pin 11 of the amplifier IC5D receives a -3.3V voltage. Pin 14 of the amplifier IC5D is simultaneously connected to the other end of capacitor C35, the other end of resistor R33, and the positive terminal of capacitor C32. One end of resistor R34 is connected to the negative terminal of capacitor C32, and the other end is connected to the output signal of the main control CPU.

4. A two-wire vibration transmitter based on the HART protocol according to claim 1, characterized in that, The main control CPU is composed of a single-chip microcomputer IC1.

5. A two-wire vibration transmitter based on the HART protocol according to claim 4, characterized in that, The current output module includes: digital-to-analog converter IC4, capacitors C17, C16, C21, C20, C19, C18, and C22, resistor R6, capacitor C12, MOSFET Q1, and capacitor C24. Pin 1 of the digital-to-analog converter IC4 is connected to one end of capacitor C17; pins 2 and 3 are connected to one end of capacitor C16; the other ends of capacitors C17 and C16 are grounded. Pins 16 and 15 of the digital-to-analog converter IC4 are connected to one end of capacitor C21; the other end of capacitor C21 is grounded. Pin 10 of the digital-to-analog converter IC4 is connected to one end of capacitor C20; the other end of capacitor C20 is grounded. Pin 11 of the digital-to-analog converter IC4 is connected to one end of capacitor C19; the other end of capacitor C19 is grounded. Pin 12 of the digital-to-analog converter IC4 is connected to one end of capacitor C18; the other end of capacitor C18 is grounded. Pin 14 of the digital-to-analog converter IC4 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to one end of resistor R6 and to pin 13 of the digital-to-analog converter IC4. One end of capacitor C23 is connected to the other end of resistor R6, and the other end is grounded. Pin 2 of MOSFET Q1 is connected to the communication module. Pin 1 of MOSFET Q1 is connected to pin 13. Pin 3 of MOSFET Q1 is connected to one end of capacitor C24 and to pin 16 of the digital-to-analog converter IC4. The other end of capacitor C24 is connected to pin 4 of the digital-to-analog converter IC4. Pins 5, 6, and 7 of the digital-to-analog converter IC4 are connected to microcontroller IC1.

6. A two-wire vibration transmitter based on the HART protocol according to claim 5, characterized in that, The communication module includes: HART modem IC2, crystal oscillator Y1, capacitors C4, C5, E5, E6, C11, C13, E3, E4, C8, C9, C10, resistors R3 and R5, interface P1, interface P20, and bridge rectifier QD1. Pin 1 of crystal oscillator Y1 is simultaneously connected to pin 21 of HART modem IC2 and one end of capacitor C4; pin 2 of crystal oscillator Y1 is simultaneously connected to pin 20 of HART modem IC2 and one end of capacitor C5; the other ends of capacitor C4 and C5 are grounded; pin 18 of HART modem IC2 is simultaneously connected to one end of capacitor E5 and one end of capacitor E6 and receives an input voltage; the other ends of capacitor E5 and E6 are grounded; pin 14 of HART modem IC2 is simultaneously connected to one end of capacitor C11; the other end of capacitor C11 is connected to pin 10 of digital-to-analog converter IC4; pin 13 of HART modem IC2 is connected to one end of capacitor C13; the other end of capacitor C13 is grounded; pin 11 of HART modem IC2 is simultaneously connected to... One end of capacitor E3 is connected to one end of capacitor E4, and the other ends of capacitor E3 and capacitor E4 are grounded. Pin 15 of HART modem IC2 is simultaneously connected to one end of capacitor C8 and one end of resistor R3. Pin 17 of HART modem IC2 is simultaneously connected to the other ends of resistor R3, resistor R4, and capacitor C9. One end of capacitor C10 is simultaneously connected to the other end of capacitor C9 and resistor R5. The other ends of capacitor C8, resistor R4, and capacitor C10 are grounded. The output of interface P1 is connected to the input of bridge rectifier QD1. The positive output of bridge rectifier QD1 is simultaneously connected to the other end of resistor R5 and pin 2 of MOSFET Q1, and the negative output is connected to pin 8 of digital-to-analog converter IC4. Interface P20 is connected to microcontroller IC1.

7. A two-wire vibration transmitter based on the HART protocol according to claim 1, characterized in that, The vibration transmitter is equipped with a power conversion module.

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