High-precision multi-communication interface signal acquisition platform integrated with signal processing function

Abstract

The utility model relates to the field of weak voltage signal data collection and processing systems, in particular to a high-precision multi-communication interface signal acquisition platform integrated with a signal processing function, which comprises a substrate provided with a singlechip controller, a power supply, a 16-path differential amplification circuit, an analog-to-digital converter and a serial port module, and the serial port module comprises an RS232 communication protocol converter, an RS485 communication protocol converter and a network port communication protocol converter. The power supply comprises a first-stage power supply and a second-stage power supply; the weak voltage signal output type sensor signal acquisition system solves the problems that an existing weak voltage signal output type sensor signal acquisition system is insufficient in signal acquisition precision, does not have instant signal processing capacity and various communication protocol serial ports, and cannot directly transmit data with an upper computer through various communication protocols.

Description

Technical Field

[0001] This utility model relates to the field of weak voltage signal data collection and processing systems, specifically a high-precision multi-communication interface signal acquisition platform with integrated signal processing functions. Background Technology

[0002] With the continuous growth in demand for precision instruments and automated control equipment, precision sensors are increasingly widely used in industrial measurement and control. This trend places more stringent technical requirements on systems for acquiring and processing weak voltage signals. Modern signal acquisition and processing systems need to possess the following key performance indicators: high-precision signal conversion capability, diverse communication interface configuration, highly compatible signal processing algorithms, and multi-channel parallel processing capabilities. Such high-performance systems have significant application value in cutting-edge technologies such as non-contact force sensing measurement and thermal property analysis based on the third harmonic principle. However, existing signal acquisition platforms generally have fewer acquisition channels, insufficient accuracy, and rarely possess simultaneous real-time signal processing and multi-serial communication functions. Therefore, a high-precision, multi-channel signal acquisition platform that integrates signal processing and serial communication is needed to acquire the weak voltage output signals of precision sensors, process them, and directly send them to a host computer for data use. A superior signal acquisition platform can promote the research and development and testing of such high-precision sensors, further leveraging their advantages. Summary of the Invention

[0003] The main purpose of this utility model is to provide a high-precision multi-communication interface signal acquisition platform that integrates signal processing functions, which can effectively solve the problem of non-contact force sensors requiring a high-precision, multi-channel signal acquisition platform that integrates signal processing functions and serial communication.

[0004] This utility model is achieved using the following technical solution: A high-precision multi-communication interface signal acquisition platform integrating signal processing functions, comprising a base plate, on which a microcontroller, a power supply, a differential amplifier circuit, an analog-to-digital converter, and a serial port module are mounted. The serial port module includes an RS232 communication protocol converter, an RS485 communication protocol converter, and a network communication protocol converter. The input of the analog-to-digital converter is connected to the output of the differential amplifier circuit, the input of the differential amplifier circuit is connected to the differential output of the sensor, the output of the analog-to-digital converter is connected to the microcontroller, the output of the microcontroller is connected to the RS232 communication protocol converter, the RS485 communication protocol converter, and the network communication protocol converter, respectively. The RS232 communication protocol converter is connected to a DB9 terminal, the RS485 communication protocol converter is connected to two terminal blocks, and the network communication protocol converter is connected to an RJ45 terminal. The power supply provides power to the microcontroller, the differential amplifier circuit, the analog-to-digital converter, and the serial port module.

[0005] In use, the differential output of the non-contact force sensor is connected to a differential amplifier circuit. The differential amplifier circuit amplifies the sensor signal and inputs it to an analog-to-digital converter (ADC). The ADC then transmits the pressure data from the non-contact force sensor to a microcontroller for real-time data processing. The data is then transmitted to the RS232, RS485, or Ethernet communication protocol converters of the serial port module. The user selects the communication protocol and connects to the specified communication protocol terminal to transmit the data to the host computer for convenient data use.

[0006] The aforementioned high-precision multi-communication interface signal acquisition platform with integrated signal processing function includes a 16-channel differential amplifier circuit. The inputs of the 16-channel differential amplifier circuit are connected to the differential outputs of the 16 sensors, and the outputs of the 16-channel differential amplifier circuit are connected to the 16 single-ended inputs of the analog-to-digital converter circuit.

[0007] The aforementioned high-precision multi-communication interface signal acquisition platform with integrated signal processing functions uses an STM32F103C8T6 microcontroller, an AD623ARZ-R7 chip in each channel of the differential amplifier circuit, an ADS1258IRTCR chip for the analog-to-digital converter, a MAX3232ESE+T chip for the RS232 communication protocol converter, a TP8485E-SR chip for the RS485 communication protocol converter, and a W5500 chip for the network port communication protocol converter.

[0008] In the aforementioned high-precision multi-communication interface signal acquisition platform with integrated signal processing function, the chip in each differential amplifier circuit is connected to a gain switching switch through gain resistors of different resistance values.

[0009] The aforementioned high-precision multi-communication interface signal acquisition platform with integrated signal processing functions also has a gain indicator light connected in series with each gain resistor.

[0010] The aforementioned high-precision multi-communication interface signal acquisition platform with integrated signal processing function has a base plate with a rounded rectangular structure.

[0011] The beneficial effects of this invention are as follows: This platform obtains high-precision 16-channel data from the sensor output through a differential amplifier circuit powered by a low-noise power supply and an analog-to-digital converter. After data processing by a microcontroller, the data is further output to the host computer using RS485, RS232, and Ethernet serial communication protocols. It features high acquisition accuracy, multiple acquisition channels, real-time signal processing, high integration, and strong practicality. It can provide high-precision signal acquisition for non-contact sensors and other engineering applications requiring real-time accurate detection, reducing the cost and difficulty of health monitoring in engineering structures. The differential acquisition by the amplifier ensures acquisition accuracy, and the AD623 differential input with single-ended output allows for better utilization of the 16 acquisition channels of the ADS1258 data acquisition chip. The differential amplifier circuit has switchable gain levels, making it suitable for acquiring signals of different magnitudes. Attached Figure Description

[0012] Figure 1 This is a system structure diagram of the present invention.

[0013] Figure 2 This is a schematic diagram of the microcontroller controller of this utility model.

[0014] Figure 3 This is a schematic diagram of the analog-to-digital converter of this utility model.

[0015] Figure 4 This is a schematic diagram of the network port communication protocol converter of this utility model.

[0016] Figure 5 This is a schematic diagram of the RS485 communication protocol converter of this utility model.

[0017] Figure 6 This is a schematic diagram of the RS232 communication protocol converter of this utility model.

[0018] Figure 7 This is a schematic diagram of the differential amplifier circuit of this utility model.

[0019] Figure 8 This is the schematic diagram of the 12V to first-stage 5V power supply of this utility model.

[0020] Figure 9 This is the schematic diagram of the first-stage 5V to first-stage 3.3V power supply of this utility model.

[0021] Figure 10 This is the schematic diagram of the first-stage 5V to first-stage 6V power supply of this utility model.

[0022] Figure 11 This is the schematic diagram of the power supply for the first stage 6V and the first stage 3.3V to the second stage 5V and the second stage 3.3V of this utility model.

[0023] Figure 12 This is the schematic diagram of the second-stage 3.3V to second-stage reverse 3.3V power supply of this utility model. Detailed Implementation

[0024] 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. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0025] like Figure 1 As shown, a high-precision multi-communication interface signal acquisition platform integrating signal processing functions includes a microcontroller controller and a power supply. The microcontroller controller is connected to an analog-to-digital converter and a serial port module. The power supply is connected to the microcontroller controller, the analog-to-digital converter, the serial port module, and a 16-channel differential amplifier circuit. The power supply uses a two-stage low-dropout linear regulator and an inverting charge pump power supply to adjust the voltage and current. The low-precision low-dropout linear regulator serves as the first-stage power supply to power the microcontroller controller, the serial port module, and the second-stage high-precision low-dropout linear regulator. The second-stage high-precision low-dropout linear regulator powers the analog-to-digital converter, the 16-channel differential amplifier circuit, and the inverting charge pump power supply. The inverting charge pump power supply outputs a negative voltage with the opposite polarity to that of the second-stage high-precision low-dropout linear regulator, which powers the negative terminal of the AD623 network in the 16-channel differential amplifier circuit.

[0026] like Figure 2 As shown, the microcontroller controller includes chip U10 (STM32F103C8T6). Pin 2 of chip U10 is connected to an LED indicator; pins 3, 4, 5, and 6 are connected to a crystal oscillator circuit; pin 7 is connected to a reset circuit; pins 8, 23, 35, and 47 are connected to digital ground; pins 9, 24, 36, and 48 are connected to the first-stage 3.3V power supply; and pins 12 and 13 are connected to... Connect to the RS232 communication protocol converter; pins 14, 15, 16, 17, 40, and 41 of chip U10 are connected to the analog-to-digital converter; pins 20 and 44 of chip U10 are connected to the BOOT circuit; pins 37 and 34 of chip U10 are connected to the microcontroller debugging circuit; pins 25, 26, 27, and 28 of chip U10 are connected to the network port communication protocol converter; and pins 29, 30, and 31 of chip U10 are connected to the RS485 communication protocol converter.

[0027] like Figure 3As shown, the analog-to-digital converter includes a chip U8 (ADS1258IRTCR). Pins 1, 2, 3, 4, 48, 47, 46, 45, 40, 39, 38, 37, 36, 35, 34, and 33 of chip U8 are connected to the output of a 16-channel differential amplifier circuit. Pins 5 and 6 of chip U8 are connected to the second-stage 5V power supply, and pin 7 of chip U8 is connected to a filter capacitor. Pins 8 and 9 of chip U8 are connected to the crystal oscillator circuit; pin 10 of chip U8 is connected to the power control circuit; pin 11 of chip U8 is connected to the reset circuit; pins 12 and 28 of chip U8 are connected to the second-stage 3.3V power supply; pins 22, 23, 24, 25, 26, and 27 of chip U8 are connected to pins 15, 17, 16, 40, 41, and 14 of the microcontroller controller, respectively; pin 29 of chip U8 is connected to digital ground; pins 30 and 31 of chip U8 are connected to the reference voltage circuit; and pins 41, 42, 43, and 44 of chip U8 are connected to the multiplexer loop.

[0028] like Figure 4 As shown, the network communication protocol converter includes a chip U13 (W5500). Pins 1, 2, 5, 6, 25, and 27 of chip U13 are connected to the RJ45 terminal circuit; pins 3, 9, 14, 16, 19, 29, and 48 of chip U13 are connected to digital ground; pins 4, 8, 11, 15, 17, 21, and 28 of chip U13 are connected to the first-stage 3.3V power supply; pins 10, 20, 22, 23, 36, and 37 of chip U13 are connected to the peripheral configuration circuit; pins 30 and 31 of chip U13 are connected to the crystal oscillator circuit; pins 32, 33, 34, and 35 of chip U13 are connected to the microcontroller controller; and pins 43, 44, and 45 of chip U13 are connected to the mode configuration circuit.

[0029] like Figure 5 As shown, the RS485 communication protocol converter includes a chip U14 (TP8485E-SR) and two terminal blocks. Pins 1, 2, 3, and 4 of chip U14 are connected to the microcontroller controller, pin 5 of chip U14 is connected to digital ground, pins 6 and 7 of chip U14 are connected to the two terminal blocks, and pin 8 of chip U14 is connected to the first-stage 3.3V power supply.

[0030] like Figure 6As shown, the RS232 communication protocol converter includes chip U11 (MAX3232ESE+T). Pins 1, 2, 3, 4, 5, and 6 of chip U11 are connected to a filter capacitor circuit. Pins 11 and 12 of chip U11 are connected to a microcontroller controller. Pins 13 and 14 of chip U11 are connected to pins 3 and 2 of a DB9 connector (D-DMR009PM-D002), respectively. Pin 15 of chip U11 is connected to digital ground. Pin 16 of chip U11 is connected to the first-stage 3.3V power supply and filter circuit.

[0031] like Figure 7 As shown, one of the 16-channel differential amplifier circuits includes chip U17 (AD623ARZ-R7) and single-pole triple-throw switch SW2 (SS13D07VG4). Pin 1 of chip U17 is connected to the common terminal pin 2 of single-pole triple-throw switch SW2. Pins 2 and 3 of chip U17 are connected to the analog differential input of the sensor. Pin 4 of chip U17 is connected to the negative voltage output pin 5 of chip U23, which is the second-stage reverse 3.3V power supply. Pin 5 of chip U17 is connected to analog ground. Pin 6 of chip U17 is connected to the analog input terminal of analog-to-digital converter chip U8 (e.g., pin 4 of chip U8). Pin 7 of chip U17 is connected to the second-stage 3.3V power supply. Pin 8 of chip U17 is connected to a three-level gain resistor network. Pin 1 of single-pole triple-throw switch SW2 is connected to a 200x gain resistor and an indicator light. Pin 3 of single-pole triple-throw switch SW2 is connected to a 100x gain resistor and an indicator light. Pin 4 of single-pole triple-throw switch SW2 is connected to a 50x gain resistor and an indicator light. In the 16-channel differential amplifier circuit, each channel has the same circuit structure. In each channel, pin 6 of the chip is connected to one of the analog input terminals of the analog-to-digital converter chip U8 (pins 1, 2, 3, 4, 48, 47, 46, 45, 40, 39, 38, 37, 36, 35, 34 and 33 of chip U8 are analog input terminals).

[0032] like Figures 8-12As shown, the power supply includes chips U30 (LM2675MX), U33 (MIC5219), U34 (TPS61040DBVR), U40 (ADP3303ARZ-3.3), U39 (ADP3303ARZ-5), and U23 (ICL7660ESA+T). Pin 7 of chip U30 is connected to the external power input, and pin 8 outputs a 5V power supply, which is the first-stage 5V power supply. The power supply is configured as follows: pin 1 of chip U33 is connected to the first-stage 5V power supply, and pin 5 outputs the first-stage 3.3V power supply; pin 5 of chip U34 is connected to the first-stage 5V power supply, and pin 1 outputs the first-stage 6V power supply; pin 5 of chip U40 is connected to the first-stage 5V power supply, and pin 2 outputs the second-stage 3.3V power supply; pin 5 of chip U39 is connected to the first-stage 6V power supply, and pin 1 outputs the second-stage 5V power supply; pin 8 of chip U23 is connected to the second-stage 3.3V power supply, and pin 5 outputs the second-stage reverse 3.3V power supply.

[0033] One specific application of this embodiment is:

[0034] First, use a single-pole three-throw switch SW2 to select the gain of the 16-channel differential amplifier circuit from 200x, 100x, and 50x. Then, connect the output of the non-contact force sensor to the sensor's analog input section. The sensor signal is amplified with high precision by the 16-channel differential amplifier circuit and input to the analog-to-digital converter (ADC). Subsequently, the ADC transmits the pressure data from the non-contact force sensor to the microcontroller for real-time data processing. The data is also transmitted via the USART serial port to the RS232, RS485, and Ethernet communication protocol converters of the serial port module. The user selects the communication protocol and connects the specified communication protocol terminal to transmit the data to the host computer for convenient data use.

[0035] In this embodiment, the analog-to-digital converter (ADC) features 24-bit signal acquisition, a gain of 128x, a sampling rate of 125kHz, and software configurability for 8 differential inputs or 16 single-ended inputs. It communicates with the microcontroller via the SPI protocol. The 16 differential amplifier circuits have differential input and single-ended output I / O functions. Each channel can switch its gain factor from 50x, 100x, or 200x by switching the gain resistor using a single-pole triple-throw switch, exhibiting a low gain error of 0.10% and a bandwidth of 800kHz. The inputs of the 16 differential amplifier circuits are connected to the 16 differential outputs of the sensors, and the outputs are connected to the 16 single-ended inputs of the ADC circuit. The microcontroller has real-time signal processing capabilities, communicating with the ADC circuit via the SPI protocol and with the serial port module via the USART protocol to achieve a complete workflow from high-precision differential signal acquisition and processing to signal output to the host computer. The serial port module includes an RS232 communication protocol converter, an RS485 communication protocol converter, and a network communication protocol converter. The RS232 communication protocol converter includes a DB9 connector and communicates with the microcontroller using the USART communication protocol. The RS485 communication protocol converter includes two terminal blocks and communicates with the microcontroller using the USART communication protocol. The network communication protocol converter includes an RJ45 connector and communicates with the microcontroller using the USART communication protocol.

[0036] The power supply can be powered by a 12V battery or a 12V DC power supply as an external power input.

[0037] It is worth noting that in the above system embodiments, the various units are divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the protection scope of this utility model.

[0038] Furthermore, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware, and the corresponding program can be stored in a computer-readable storage medium.

Claims

1. A high-precision multi-communication interface signal acquisition platform integrating signal processing functions, characterized in that, The system includes a base plate, on which a microcontroller, power supply, differential amplifier circuit, analog-to-digital converter (ADC), and serial port module are mounted. The serial port module includes an RS232 communication protocol converter, an RS485 communication protocol converter, and a network communication protocol converter. The input of the ADC is connected to the output of the differential amplifier circuit, and the input of the differential amplifier circuit is connected to the differential output of the sensor. The output of the ADC is connected to the microcontroller, and the output of the microcontroller is connected to the RS232, RS485, and network communication protocol converters, respectively. The RS232 communication protocol converter is connected to a DB9 terminal, the RS485 communication protocol converter is connected to two terminal blocks, and the network communication protocol converter is connected to an RJ45 terminal. The power supply provides power to the microcontroller, differential amplifier circuit, ADC, and serial port module.

2. The high-precision multi-communication interface signal acquisition platform integrated with signal processing functions according to claim 1, characterized in that, The differential amplifier circuit is a 16-channel differential amplifier circuit. The inputs of the 16-channel differential amplifier circuit are connected to the differential outputs of the 16 sensors, and the outputs of the 16-channel differential amplifier circuit are connected to the 16 single-ended inputs of the analog-to-digital converter circuit.

3. The high-precision multi-communication interface signal acquisition platform integrated with signal processing functions according to claim 2, characterized in that, The microcontroller is an STM32F103C8T6. Each channel of the differential amplifier circuit includes an AD623ARZ-R7 chip, the analog-to-digital converter is an ADS1258IRTCR, the RS232 communication protocol converter is a MAX3232ESE+T, the RS485 communication protocol converter is a TP8485E-SR, and the network communication protocol converter is a W5500.

4. The high-precision multi-communication interface signal acquisition platform integrated with signal processing functions according to claim 2 or 3, characterized in that, The chip in each differential amplifier circuit is connected to a gain switching switch through gain resistors of different values.

5. The high-precision multi-communication interface signal acquisition platform integrated with signal processing functions according to claim 4, characterized in that, Each gain resistor is also connected in series with a gain indicator light.

6. The high-precision multi-communication interface signal acquisition platform integrated with signal processing functions according to claim 1 or 2 or 3 or 4, characterized in that, The substrate is a rounded rectangular structure.

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