Wireless vibration sensor circuit of differential interface

Abstract

The utility model relates to a vibration sensor technology, in particular to a wireless vibration sensor circuit of a differential interface, which comprises a power supply module, an acceleration acquisition module, a digital-to-analog conversion module, a wireless communication module and an interface conversion module, the power supply module is used for supplying power to the acceleration acquisition module, the digital-to-analog conversion module, the interface conversion module and the wireless communication module; the acceleration acquisition module is used for acquiring a vibration signal and transmitting the vibration signal to the digital-to-analog conversion module, the digital-to-analog conversion module converts the received vibration signal into a digital signal, the converted digital signal is converted into a differential signal through the interface conversion module, and the differential signal is transmitted through the wireless communication module. The vibration sensor designed by the utility model has the advantages of differential port output, capability of carrying out vibration signals in a wide frequency range, high sensitivity and good stability.

Description

Technical Field

[0001] This utility model relates to vibration sensor technology, and more particularly to a wireless vibration sensor circuit with a differential interface. Background Technology

[0002] Vibration sensors are widely used in vibration monitoring in fields such as road traffic bridges, buildings, etc. As key equipment in industrial production, malfunctions can lead to significant economic losses for enterprises. Vibration accounts for a large proportion of equipment failures and is also a crucial factor affecting the safe operation of rotating machinery, directly reflecting the safe and stable operating status of the equipment. Therefore, vibration detection is indispensable. Vibration sensors are specifically designed to measure dynamic vibrations, with a frequency response range from very low frequencies to 15kHz.

[0003] For example, the existing technology CN202220554291.9 has a small frequency range and low sensitivity in its vibration sensor. Utility Model Content

[0004] This invention addresses the problems of small frequency range, low sensitivity, and poor stability in existing vibration sensors by providing a differential interface wireless vibration sensor circuit.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0006] A differential interface wireless vibration sensor circuit includes a power supply module, an acceleration acquisition module, a digital-to-analog converter module, and a wireless communication module. The circuit is characterized by further including an interface conversion module. The power supply module provides power to the acceleration acquisition module, the digital-to-analog converter module, the interface conversion module, and the wireless communication module. The acceleration acquisition module acquires vibration signals and transmits them to the digital-to-analog converter module. The digital-to-analog converter module converts the received vibration signals into digital signals. The converted digital signals are then converted into differential signals by the interface conversion module, and the differential signals are transmitted through the wireless communication module.

[0007] Preferably, the digital-to-analog conversion module includes a feedback operational amplifier unit, a conversion circuit unit, a voltage bias unit, and a protection unit. The output terminal of the conversion circuit unit is electrically connected to the feedback operational amplifier unit and the voltage bias unit, and the input terminal of the voltage bias unit is electrically connected to the feedback operational amplifier unit. The output terminal of the voltage bias unit is connected to the protection unit, and a differential signal is output through the protection unit.

[0008] Preferably, the feedback operational amplifier unit includes an operational amplifier U1, a resistor R1, and a resistor R2; pin 3 of the operational amplifier U1 is connected to a single-ended input signal V_IN, pin 4 of the operational amplifier U1 is connected to a negative voltage U1, pin 8 of the operational amplifier U1 is connected to a positive voltage U1, pin 2 of the operational amplifier U1 is connected to resistors R1 and R2, and the other end of resistor R2 is grounded.

[0009] Preferably, the voltage bias circuit includes a voltage regulator Q1, a capacitor C1, a resistor R4, a resistor R5, a resistor R6, and a resistor R7.

[0010] Pin 1 of voltage regulator Q1 is connected to voltage VCC through resistor R4; pin 2 of voltage regulator Q1 is connected to resistors R5 and R6 in sequence; the other end of resistor R6 is grounded, and pin 3 of voltage regulator U3 is grounded; one end of capacitor C1 is connected to the node of resistor R7 and resistor R6, and the other end is grounded.

[0011] Preferably, the conversion circuit unit includes a positive voltage conversion unit and a negative voltage conversion unit. The positive voltage conversion unit includes a comparator U2, a resistor R10, a resistor R11, a resistor R12, and a resistor R13.

[0012] The positive voltage U1 is connected to port 8 of comparator U2, the negative voltage U1 is connected to port 4 of comparator U2, resistors R12 and R13 are connected to port 5 of comparator U2, the other end of resistor R13 is grounded, resistors R11 and R10 are connected to port 6 of comparator U2, and resistors R11, negative voltage conversion unit and protection unit are connected to port 7 of comparator U2.

[0013] The negative voltage conversion unit includes comparator U3, resistor R9, and resistor R8;

[0014] The positive voltage U1 is connected to port 4 of comparator U2, the negative voltage U1 is connected to port 8 of comparator U2, resistors R8 and R9 are connected to port 3 of comparator U2, resistor R7 is connected to port 2 of comparator U2, and resistor R10 and the protection unit are connected to port 7 of comparator U2.

[0015] Preferably, the protection unit includes a positive voltage protection unit and a negative voltage protection unit, with the positive voltage protection unit connected to the positive voltage conversion unit and the negative voltage protection unit connected to the negative voltage conversion unit.

[0016] The positive voltage protection unit includes a resistor R14 and a capacitor C2; the resistor R14 and the capacitor C2 are connected in parallel, and their input terminal is the output terminal of the positive voltage protection unit, which is V_OP.

[0017] The negative voltage protection unit includes a resistor R15 and a capacitor C3; the resistor R15 and the capacitor C3 are connected in parallel, and their input terminal is the output terminal of the negative voltage protection unit, with the input terminal being V_ON.

[0018] Preferably, the power module includes an energy storage unit, a voltage conversion unit, and a charging unit; the energy storage unit is used to provide power to the acceleration acquisition module, the charging unit is used to charge the energy storage battery, and the voltage conversion unit is used to convert the voltage level of the energy storage unit into different voltage levels and provide the converted voltage levels to the acceleration acquisition module, the digital-to-analog converter, the interface conversion module, and the wireless communication module.

[0019] This utility model, by adopting the above technical solution, has the following significant technical effects:

[0020] The vibration sensor designed in this invention has a differential port output, which can output vibration signals over a wide frequency range. It also has high sensitivity and good stability. Attached Figure Description

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

[0022] Figure 2 This is a schematic diagram of the power module of this utility model.

[0023] Figure 3 This is a circuit diagram of the interface conversion module of this utility model. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] A differential interface wireless vibration sensor circuit, Figure 1 The system includes a power supply module, an acceleration acquisition module, a digital-to-analog converter module, and a wireless communication module, as well as an interface conversion module. The power supply module provides power to the acceleration acquisition module, the digital-to-analog converter module, the interface conversion module, and the wireless communication module. The acceleration acquisition module acquires vibration signals and transmits them to the digital-to-analog converter module. The digital-to-analog converter module converts the received vibration signals into digital signals. The converted digital signals are then converted into differential signals by the interface conversion module, and the differential signals are transmitted through the wireless communication module.

[0027] In this embodiment, the acceleration acquisition module uses a MEMS acceleration sensor, model ADXL1002, and the wireless communication module is a WiFi wireless communication module.

[0028] Example 2

[0029] Based on Embodiment 1, the digital-to-analog conversion module of this embodiment includes a feedback operational amplifier unit, a conversion circuit unit, a voltage bias unit, and a protection unit. The output terminal of the conversion circuit unit is electrically connected to the feedback operational amplifier unit and the voltage bias unit, and the input terminal of the voltage bias unit is electrically connected to the feedback operational amplifier unit. The output terminal of the voltage bias unit is connected to the protection unit, and a differential signal is output through the protection unit.

[0030] Figure 3 In the circuit, the feedback operational amplifier unit includes operational amplifier U1, resistor R1 and resistor R2; pin 3 of operational amplifier U1 is connected to the single-ended input signal V_IN, pin 4 of operational amplifier U1 is connected to the negative voltage U1; pin 8 of operational amplifier U1 is connected to the positive voltage U1; pin 2 of operational amplifier U1 is connected to resistor R1 and resistor R2, and the other end of resistor R2 is grounded.

[0031] The voltage bias circuit includes a voltage regulator Q1, a capacitor C1, a resistor R4, a resistor R5, a resistor R6, and a resistor R7;

[0032] Pin 1 of voltage regulator Q1 is connected to voltage VCC through resistor R4; pin 2 of voltage regulator Q1 is connected to resistors R5 and R6 in sequence; the other end of resistor R6 is grounded, and pin 3 of voltage regulator U3 is grounded; one end of capacitor C1 is connected to the node of resistor R7 and resistor R6, and the other end is grounded.

[0033] The conversion circuit unit includes a positive voltage conversion unit and a negative voltage conversion unit. The positive voltage conversion unit includes a comparator U2, resistors R10, R11, R12, and R13.

[0034] The positive voltage U1 is connected to port 8 of comparator U2, the negative voltage U1 is connected to port 4 of comparator U2, resistors R12 and R13 are connected to port 5 of comparator U2, the other end of resistor R13 is grounded, resistors R11 and R10 are connected to port 6 of comparator U2, and resistors R11, negative voltage conversion unit and protection unit are connected to port 7 of comparator U2.

[0035] The negative voltage conversion unit includes comparator U3, resistor R9, and resistor R8; port 4 of comparator U2 is connected to positive voltage U1, port 8 of comparator U2 is connected to negative voltage U1, port 3 of comparator U2 is connected to resistors R8 and R9, port 2 of comparator U2 is connected to resistor R7, port 7 of comparator U2 is connected to resistor R10 and protection unit.

[0036] The protection unit includes a positive voltage protection unit and a negative voltage protection unit. The positive voltage protection unit is connected to the positive voltage conversion unit, and the negative voltage protection unit is connected to the negative voltage conversion unit.

[0037] The positive voltage protection unit includes a resistor R14 and a capacitor C2; the resistor R14 and the capacitor C2 are connected in parallel, and their input terminal is the output terminal of the positive voltage protection unit, which is V_OP.

[0038] The negative voltage protection unit includes a resistor R15 and a capacitor C3; the resistor R15 and the capacitor C3 are connected in parallel, and their input terminal is the output terminal of the negative voltage protection unit, with the input terminal being V_ON.

[0039] Example 3

[0040] Based on the above embodiments, the power module of this embodiment includes an energy storage unit, a voltage conversion unit, and a charging unit; the energy storage unit is used to provide power to the acceleration acquisition module, the charging unit is used to charge the energy storage battery, and the voltage conversion unit is used to convert the voltage level of the energy storage unit into different voltage levels and provide the converted voltage levels to the acceleration acquisition module, the digital-to-analog conversion module, the interface conversion module, and the wireless communication module.

[0041] The power supply module uses two 14500 lithium batteries connected in series to provide a 7.4V power supply voltage, and a matching two-cell series-connected charging module was also selected. Due to the high power consumption of the communication module, a 3.3V DC / DC level converter module was chosen to power the ESP32S3 module. Based on the low power consumption and high-level stability requirements of the ADS8866 analog-to-digital converter chip and the ADXL1002 accelerometer, a 3.3V level reference module was selected to power the ADS8866 chip, and a 5V level reference module was selected to power the ADXL1002 accelerometer and provide a level reference for the ADS8866 chip. The power supply design ensures the stability of data acquisition and operation of the wireless vibration sensor.

Claims

1. A differential interface wireless vibration sensor circuit, comprising a power supply module, an acceleration acquisition module, a digital-to-analog converter module, and a wireless communication module, characterized in that, It also includes an interface conversion module; a power supply module to provide power to the acceleration acquisition module, digital-to-analog conversion module, interface conversion module and wireless communication module; the acceleration acquisition module to acquire vibration signals and transmit the vibration signals to the digital-to-analog conversion module, the digital-to-analog conversion module to convert the received vibration signals into digital signals, the converted digital signals to differential signals through the interface conversion module, and the differential signals to be transmitted through the wireless communication module.

2. The differential interface wireless vibration sensor circuit according to claim 1, characterized in that, The digital-to-analog conversion module includes a feedback operational amplifier unit, a conversion circuit unit, a voltage bias unit, and a protection unit. The output terminal of the conversion circuit unit is electrically connected to the feedback operational amplifier unit and the voltage bias unit, and the input terminal of the voltage bias unit is electrically connected to the feedback operational amplifier unit. The output terminal of the voltage bias unit is connected to the protection unit, and a differential signal is output through the protection unit.

3. The differential interface wireless vibration sensor circuit according to claim 2, characterized in that, The feedback operational amplifier unit includes operational amplifier U1, resistor R1, and resistor R2; pin 3 of operational amplifier U1 is connected to the single-ended input signal V_IN, pin 4 of operational amplifier U1 is connected to the negative voltage U1, pin 8 of operational amplifier U1 is connected to the positive voltage U1, pin 2 of operational amplifier U1 is connected to resistor R1 and resistor R2, and the other end of resistor R2 is grounded.

4. The differential interface wireless vibration sensor circuit according to claim 2, characterized in that, The voltage bias circuit includes a voltage regulator Q1, a capacitor C1, a resistor R4, a resistor R5, a resistor R6, and a resistor R7; Pin 1 of voltage regulator Q1 is connected to voltage VCC through resistor R4; pin 2 of voltage regulator Q1 is connected to resistors R5 and R6 in sequence; the other end of resistor R6 is grounded, and pin 3 of voltage regulator U3 is grounded; one end of capacitor C1 is connected to the node of resistor R7 and resistor R6, and the other end is grounded.

5. A differential interface wireless vibration sensor circuit according to claim 2, characterized in that, The conversion circuit unit includes a positive voltage conversion unit and a negative voltage conversion unit. The positive voltage conversion unit includes a comparator U2, resistors R10, R11, R12, and R13. The positive voltage U1 is connected to port 8 of comparator U2, the negative voltage U1 is connected to port 4 of comparator U2, resistors R12 and R13 are connected to port 5 of comparator U2, the other end of resistor R13 is grounded, resistors R11 and R10 are connected to port 6 of comparator U2, and resistors R11, negative voltage conversion unit and protection unit are connected to port 7 of comparator U2. The negative voltage conversion unit includes comparator U3, resistor R9, and resistor R8; The positive voltage U1 is connected to port 4 of comparator U2, the negative voltage U1 is connected to port 8 of comparator U2, resistors R8 and R9 are connected to port 3 of comparator U2, resistor R7 is connected to port 2 of comparator U2, and resistor R10 and the protection unit are connected to port 7 of comparator U2.

6. A differential interface wireless vibration sensor circuit according to claim 2, characterized in that, The protection unit includes a positive voltage protection unit and a negative voltage protection unit. The positive voltage protection unit is connected to the positive voltage conversion unit, and the negative voltage protection unit is connected to the negative voltage conversion unit. The positive voltage protection unit includes a resistor R14 and a capacitor C2; the resistor R14 and the capacitor C2 are connected in parallel, and their input terminal is the output terminal of the positive voltage protection unit, which is V_OP. The negative voltage protection unit includes a resistor R15 and a capacitor C3; the resistor R15 and the capacitor C3 are connected in parallel, and their input terminal is the output terminal of the negative voltage protection unit, with the input terminal being V_ON.

7. The differential interface wireless vibration sensor circuit according to claim 1, characterized in that, The power module includes an energy storage unit, a voltage conversion unit, and a charging unit. The energy storage unit provides power to the acceleration acquisition module, the charging unit charges the energy storage battery, and the voltage conversion unit converts the voltage level of the energy storage unit into different voltage levels and provides the converted voltage levels to the acceleration acquisition module, the digital-to-analog converter, the interface conversion module, and the wireless communication module.

Images