A multi-source data fusion acquisition system

Abstract

This invention discloses a multi-source data fusion acquisition system, belonging to the field of online monitoring technology for generator set operation. The power supply module provides power to the acquisition and output module, the low-power main control module, the wireless communication module, and the SRAM storage module. The acquisition and output module acquires voltage, current, digital signals, and digital logic signals and outputs them to the low-power main control module. The low-power main control module fuses the data acquired by the acquisition and output module, controls the power supply on / off, controls the power supply and data communication of the SRAM storage module, calls the functions and timing of the wireless communication module, and controls the working and sleep timing of the entire acquisition system. The wireless communication module transmits data to the low-power main control module and the host computer. This invention controls the power supply module, acquisition and output module, wireless communication module, and SRAM storage module through the low-power main control module. By scheduling and allocating the working and sleep times of each module, a low-power design is achieved, reducing the overall power consumption of the system.

Description

Technical Field

[0001] This invention belongs to the field of online monitoring technology for generator set operation, and specifically relates to a multi-source data fusion acquisition system. Background Technology

[0002] To monitor the operating status of the generator units, the hydropower station is equipped with an online unit status monitoring system. This system consists of sensor units, data acquisition units, and a host computer unit.

[0003] Condition monitoring systems for large generator sets require the collection of various types of sensor data for analysis of the unit's operating status. Traditional implementation methods involve using dedicated cables to extract sensor signals from each measuring point. These cables originate from terminal boxes near the sensors on the generator side and are laid over long distances to the condition monitoring system's data acquisition cabinet located in the local control room or cabinet space. This results in a large number of cables, complex routing, and significant space occupation in cable trays. Dozens of cables can be laid, with runs reaching hundreds of meters, leading to substantial installation and maintenance work.

[0004] The application of wireless sensing technology can improve this problem, but currently it is mostly used in generator set monitoring and data acquisition and wireless transmission node systems, which still have the following problems: The combination of "single-type acquisition module + conventional wireless module" means that the data collected by a single system is of a single type, and multiple systems are required for comprehensive monitoring, which increases investment and maintenance workload. The data acquisition and wireless transmission nodes feature a power-efficient design that supports conventional industrial sensors powered by 9-36VDC and operates continuously, resulting in high power consumption and reliance on wired power supply or frequent power supply replacements. The lack of networking functionality at the data acquisition and wireless transmission nodes results in short data communication distances and limited coverage, leading to fragmented management of monitoring data.

[0005] In existing generator set condition monitoring and acquisition systems, Chinese Patent No. CN210068371U, Publication Date: February 14, 2020, discloses a multi-source distributed acquisition system for hydro-generator sets. This system includes a front-end distributed data acquisition device and a back-end bus-type data acquisition device connected via fiber optic repeaters and a relay CPU. The front-end distributed data acquisition device, fiber optic repeaters, relay CPU, and back-end bus-type data acquisition device are connected sequentially. The front-end distributed data acquisition device includes electrically connected sensors and acquisition cards. The sensors are installed on the hydro-generator set and include Class A, Class B, and Class C sensors. The acquisition cards include Class A, Class B, and Class C acquisition cards. Type A sensors are electrically connected to Type A acquisition cards, Type B sensors are electrically connected to Type B acquisition cards, and Type C sensors are electrically connected to Type C acquisition cards. All Type A, Type B, and Type C acquisition cards are electrically connected to fiber optic repeaters. Each Type A acquisition card contains a Type A signal conditioner, each Type B acquisition card contains a Type B signal conditioner, and each Type C acquisition card contains a Type C signal conditioner. All Type A, Type B, and Type C sensors, along with the Type A acquisition cards, Type B acquisition cards, Type C acquisition cards, fiber optic repeaters, and repeater CPUs, are connected to mains power via independent conditioning power supplies. The back-end bus-type data acquisition device includes a mains engineering station, which is electrically connected to the repeater CPU and directly connected to mains power.

[0006] However, the aforementioned existing technologies have obvious shortcomings: 1. Existing data acquisition systems use fiber optic repeaters and repeater CPUs for transmission. This adds a gateway receiving system during data communication. The fiber optic repeaters and repeater CPUs cannot control the energy consumption of the data acquisition system, thus increasing the overall power consumption of the system.

[0007] 2. Existing data acquisition systems use wired communication, which results in complex wiring, increases system size, and reduces the convenience of installation and maintenance. Summary of the Invention

[0008] The purpose of this invention is to overcome the aforementioned problems in the prior art and provide a multi-source data fusion acquisition system to solve the problem of increased power consumption of the entire system caused by multiple gateway receiving systems during data communication.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multi-source data fusion acquisition system, characterized by comprising a power supply module, an acquisition and output module, a low-power main control module, a wireless communication module, and an SRAM storage module; the power supply module is connected to the acquisition and output module, the low-power main control module, the wireless communication module, and the SRAM storage module; the acquisition and output module is connected to the low-power main control module, and the low-power main control module is connected to both the wireless communication module and the SRAM storage module; the power supply module provides power to the acquisition and output module, the low-power main control module, the wireless communication module, and the SRAM storage module; the acquisition and output module acquires voltage, current, digital signals, and digital logic signals from relevant sensors of the generator set and outputs them to the low-power main control module; the low-power main control module fuses the data acquired by the acquisition and output module, controls the power supply to and from the SRAM storage module, controls data communication, and configures and invokes the wireless communication module. The system functions to schedule and control the operation and sleep timing of the entire acquisition system; the wireless communication module is used to transmit data to the low-power main control module and the host computer or to relay data; the SRAM storage module is used to store temporary data to be processed and sent in the low-power main control module; the low-power main control module includes a step-down module, a microcontroller, a crystal oscillator excitation circuit, and a reset circuit; the microcontroller is connected to the step-down module, the crystal oscillator excitation circuit, and the reset circuit respectively, and the step-down module and the microcontroller are connected to the power supply module. The microcontroller controls the on / off of the power supply terminal of the power supply module to realize the power management of each module; the microcontroller is also connected to the acquisition and output module, the SRAM storage module, and the wireless communication module respectively. The microcontroller reads the data acquired by the acquisition and output module, and at the same time stores the acquired and temporary data to be processed and sent in the SRAM storage module, and communicates with the wireless communication module to realize data transmission and reception.

[0010] The power supply module includes a constant power supply module and a controllable branch power supply module; the constant power supply module is used to filter and suppress surges in the input and output power to convert it into a stable power supply, and to supply power to the controllable branch power supply module and the low-power main control module; the controllable branch power supply module is used to control the power supply on and off of the acquisition and output module, the SRAM storage module and the wireless communication module in a coordinated manner through the controllable branch power supply module and the low-power main control module.

[0011] The step-down module is connected to the constant power supply module, and the microcontroller is connected to the PMOS transistor in the controllable branch power supply module. The microcontroller controls the PMOS transistor to control the on / off of the power supply terminal of the controllable branch power supply module, thereby realizing power management of each module.

[0012] The constant power supply module filters and suppresses surges in the input 12VDC power supply, converting it into stable 5VDC and 3.3VDC power supplies. The 5VDC and 3.3VDC power supplies power the controllable branch power supply module, while the 3.3VDC power supply powers the low-power main control module.

[0013] The acquisition and output module includes an analog voltage acquisition module, an analog current acquisition module, a digital switch quantity acquisition module, a digital switch quantity output module, and a digital communication module. The analog voltage acquisition module performs voltage division acquisition and channel protection on the input analog voltage within the ±5V range of the MEMS sensor, ensuring the acquired voltage is ≤3.3V. The analog current acquisition module acquires and protects the 4-20mA input analog current of the current output sensor, ensuring the acquired voltage is ≤3.3V. The digital switch quantity acquisition module acquires and protects the digital switch quantities of the MEMS sensor and industrial sensor. The digital communication module establishes UART and I / O communication between the MEMS sensor, current output sensor, and industrial sensor and the low-power main control module. 2 C-level communication; the digital switch output module outputs a 5V TTL digital switch signal to the indicator.

[0014] The digital switch acquisition module is used to clamp and current limit the TTL level switch signals from the MEMS sensor to ensure that the acquisition voltage is ≤3.3V.

[0015] The digital switch signal acquisition module is used to perform optocoupler isolation on switch signals from external conventional industrial sensors, with a protection voltage of ≥±30V, and to sample and protect the output voltage of the optocoupler to ensure that the acquisition voltage is ≤3.3V.

[0016] The digital communication module is used for I 2 The C signal undergoes isolation level conversion, and the RS485 communication signal undergoes isolation level conversion to ensure normal communication.

[0017] The wireless communication module is a Zigbee module, which communicates with the low-power main control module via a serial port. It is used to send data from the low-power main control module to the gateway or other relay nodes via a wireless link, or to receive external data sent by the gateway or other relay nodes and send it back to the low-power main control module.

[0018] The SRAM storage module communicates with the low-power main control module via the SPI bus and is used to store temporary data to be processed and sent.

[0019] The temporary data to be processed and sent includes the collected raw data and the summarized data to be sent via the wireless module.

[0020] The advantages of using this invention are: I. Compared with the prior art, the present invention controls the power module, acquisition and output module, wireless communication module and SRAM storage module through a low-power main control module. By scheduling and allocating the working and sleep times of each module, a low-power design is achieved, reducing the overall power consumption of the system. At the same time, wireless communication is carried out using the wireless communication module, abandoning the original optical fiber connection method, reducing the gateway receiving system in the data communication process, and reducing power consumption.

[0021] Second, the acquisition and output module of this invention can simultaneously acquire analog voltage and current signals, digital signals, and digital logic signals, solving the problem that multiple devices are needed for comprehensive monitoring in the prior art.

[0022] Third, this invention uses a wireless communication module to achieve wireless communication, supports multi-module networking, and enables a single module to function as both a data acquisition node and a data relay node. The node functions can be flexibly configured and changed, and the monitoring coverage can be expanded without adding a large number of receiving gateway systems.

[0023] Fourth, this invention only activates the high-power module when data collection and transmission are required, and completely shuts down the power at other times, solving the problem of high power consumption during continuous operation of traditional nodes; reduced size: the low-power design reduces the need for large-capacity batteries or complex heat dissipation structures, making the system smaller and easier to install next to generator sets with limited space.

[0024] V. This invention designs specialized protection circuits for different signal sources. It clamps and limits the current of the TTL signal from the MEMS sensor, provides optocoupler isolation (withstand voltage ≥ ±30V) for the switching signals of the industrial sensor, and provides voltage divider protection for all analog signals (ensuring ≤ 3.3V).

[0025] VI. The multi-source data fusion acquisition system designed in this invention can be combined with multiple systems to form a network, and has the functions of data acquisition and data relay. It can be configured according to the specific acquisition requirements of the installation site, and then transmitted to the host computer by the gateway for analysis, thereby improving the efficiency of acquisition and analysis. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the data fusion acquisition system of the present invention; Figure 2 This is a schematic diagram of the networking system structure of the present invention. Detailed Implementation

[0027] Example 1 This embodiment, in conjunction with the accompanying drawings, further illustrates the structure and principle of the present invention: A multi-source data fusion acquisition system, characterized by comprising a power supply module, an acquisition and output module, a low-power main control module, a wireless communication module, and an SRAM storage module; the power supply module is connected to the acquisition and output module, the low-power main control module, the wireless communication module, and the SRAM storage module; the acquisition and output module is connected to the low-power main control module, and the low-power main control module is connected to both the wireless communication module and the SRAM storage module; the power supply module provides power to the acquisition and output module, the low-power main control module, the wireless communication module, and the SRAM storage module; the acquisition and output module acquires voltage, current, digital signals, and digital logic signals from relevant sensors of the generator set and outputs them to the low-power main control module; the low-power main control module fuses the data acquired by the acquisition and output module, controls the power supply to and from the SRAM storage module, controls data communication, and configures and invokes the wireless communication module. The system functions to schedule and control the operation and sleep timing of the entire acquisition system; the wireless communication module is used to transmit data to the low-power main control module and the host computer or to relay data; the SRAM storage module is used to store temporary data to be processed and sent in the low-power main control module; the low-power main control module includes a step-down module, a microcontroller, a crystal oscillator excitation circuit, and a reset circuit; the microcontroller is connected to the step-down module, the crystal oscillator excitation circuit, and the reset circuit respectively, and the step-down module and the microcontroller are connected to the power supply module. The microcontroller controls the on / off of the power supply terminal of the power supply module to realize the power management of each module; the microcontroller is also connected to the acquisition and output module, the SRAM storage module, and the wireless communication module respectively. The microcontroller reads the data acquired by the acquisition and output module, and at the same time stores the acquired and temporary data to be processed and sent in the SRAM storage module, and communicates with the wireless communication module to realize data transmission and reception.

[0028] The power supply module includes a constant power supply module and a controllable branch power supply module; the constant power supply module is used to filter and suppress surges in the input and output power to convert it into a stable power supply, and to supply power to the controllable branch power supply module and the low-power main control module; the controllable branch power supply module is used to control the power supply on and off of the acquisition and output module, the SRAM storage module and the wireless communication module in a coordinated manner through the controllable branch power supply module and the low-power main control module.

[0029] The step-down module is connected to the constant power supply module, and the microcontroller is connected to the PMOS transistor in the controllable branch power supply module. The microcontroller controls the PMOS transistor to control the on / off of the power supply terminal of the controllable branch power supply module, thereby realizing power management of each module.

[0030] The constant power supply module filters and suppresses surges in the input 12VDC power supply, converting it into stable 5VDC and 3.3VDC power supplies. The 5VDC and 3.3VDC power supplies power the controllable branch power supply module, while the 3.3VDC power supply powers the low-power main control module.

[0031] The acquisition and output module includes an analog voltage acquisition module, an analog current acquisition module, a digital switch quantity acquisition module, a digital switch quantity output module, and a digital communication module. The analog voltage acquisition module performs voltage division acquisition and channel protection on the input analog voltage within the ±5V range of the MEMS sensor, ensuring the acquired voltage is ≤3.3V. The analog current acquisition module acquires and protects the 4-20mA input analog current of the current output sensor, ensuring the acquired voltage is ≤3.3V. The digital switch quantity acquisition module acquires and protects the digital switch quantities of the MEMS sensor and industrial sensor. The digital communication module establishes UART and I / O communication between the MEMS sensor, current output sensor, and industrial sensor and the low-power main control module. 2 C-level communication; the digital switch output module outputs a 5V TTL digital switch signal to the indicator.

[0032] The digital switch acquisition module is used to clamp and current limit the TTL level switch signals from the MEMS sensor to ensure that the acquisition voltage is ≤3.3V.

[0033] The digital switch signal acquisition module is used to perform optocoupler isolation on switch signals from external conventional industrial sensors, with a protection voltage of ≥±30V, and to sample and protect the output voltage of the optocoupler to ensure that the acquisition voltage is ≤3.3V.

[0034] The digital communication module is used for I 2 The C signal undergoes isolation level conversion, and the RS485 communication signal undergoes isolation level conversion to ensure normal communication.

[0035] The wireless communication module is a Zigbee module, which communicates with the low-power main control module via a serial port. It is used to send data from the low-power main control module to the gateway or other relay nodes via a wireless link, or to receive external data sent by the gateway or other relay nodes and send it back to the low-power main control module.

[0036] The SRAM storage module communicates with the low-power main control module via the SPI bus and is used to store temporary data to be processed and sent. The temporary data to be processed and sent includes the collected raw data and the summarized data to be sent via the wireless module.

[0037] as follows Figure 1 As shown, this invention relates to a multi-source data fusion acquisition system, which consists of a power supply module, an acquisition and output module, a low-power main control module, an SRAM storage module, and a wireless communication module.

[0038] A multi-source data fusion acquisition system, wherein a single system consists of a power supply module, an acquisition and output module, a low-power main control module, an SRAM storage module, a wireless communication module, etc.

[0039] The power supply module consists of two parts: a constant power supply module and a controllable branch power supply module. The constant power supply module filters and suppresses surges in the input 12VDC power supply, converting it into a stable 5VDC and 3.3VDC power supply to power the controllable branch power supply module. The 3.3VDC power supply also powers the low-power main control module, keeping it constantly powered. The controllable branch power supply module, through MOSFETs and the low-power main control module, collaboratively controls the power supply to the back-end module branches, including the acquisition and output module, SRAM storage module, and wireless communication module.

[0040] The acquisition and output module consists of sub-modules such as an analog voltage acquisition module, an analog current acquisition module, a digital switch quantity acquisition module, a digital communication module, and a digital switch quantity output module. The analog voltage acquisition module performs voltage division acquisition and channel protection on the input analog voltage within the ±5V range to ensure that the acquisition voltage is ≤3.3V. The analog current acquisition module samples the input analog current of 4-20mA and performs channel protection to ensure that the acquisition voltage is ≤3.3V. The digital switch quantity acquisition module samples and performs channel protection on the digital switch quantities of MEMS sensors and external conventional industrial sensors. The system clamps and current-limits TTL-level switching signals from MEMS sensors to ensure the acquisition voltage is ≤3.3V; it optocouples and isolates switching signals from external conventional industrial sensors to protect the voltage to ≥±30V, and samples and protects the output voltage of the optocoupler to ensure the acquisition voltage is ≤3.3V; the digital communication module performs UART and I2C communication, and performs isolation level conversion on I2C signals and RS485 communication signals to ensure normal communication; the digital switching output module outputs 5V TTL digital switching signals to external indicators.

[0041] In the controllable branch power module, the source and drain of the PMOS transistor are connected to the 5V power supply and the power supply terminal of the controllable branch power module, respectively. The gate level of the PMOS transistor is controlled by the switching on and off of an NPN transistor. The base of this NPN transistor is connected to an I / O pin of the low-power main control module. The high and low levels output by this I / O pin can control the switching on and off of the NPN transistor, changing the gate level of the PMOS transistor, thereby switching the source and drain of the PMOS transistor on and off, and thus switching the 5V power supply on and off with the power supply terminal of the controllable branch power module.

[0042] The number of channels in each submodule of the acquisition and output module can be configured according to application requirements.

[0043] The low-power main control module consists of a low-power microcontroller minimum system. It is responsible for coordinating the acquisition and output modules, controlling the power supply of the control branches, controlling the power supply of the SRAM storage module and data communication, calling the functions and timing of the wireless communication module, and controlling the system's working and sleep timing.

[0044] The low-power main control module consists of a low-power microcontroller minimum system, including at least a 5VDC to 3.3VDC step-down module, a microcontroller, a crystal oscillator excitation circuit, and a reset circuit. The microcontroller controls the output level of corresponding pins, controlling the switching of PMOS transistors to manage the power supply of various external modules. The microcontroller enables the ADC, I2C, and UART multiplexing functions of corresponding pins to read data from external acquisition modules. It also enables the SPI multiplexing function of corresponding pins to read and write data to the SRAM module, storing and retrieving data. Finally, it enables the UART multiplexing function of corresponding pins to communicate with the wireless communication module, enabling data transmission and reception. The low-power main control module can be configured with the wireless communication module's network function as either a terminal or a router. Devices configured with the former function act as acquisition nodes, performing data acquisition and transmission; devices configured with the latter function act as relay nodes, forwarding data within the network.

[0045] The core microcontroller of the low-power main control module is GigaDevice GD32L233RCT6.

[0046] The SRAM storage module communicates with the low-power main control module via the SPI bus and is responsible for storing temporary data to be processed and sent, including raw data collected and summary data to be sent via the wireless module.

[0047] The wireless communication module is a Zigbee module, which communicates with the low-power main control module via serial port. It is responsible for sending data from the low-power main control module through the wireless link, or receiving external data and sending it back to the low-power main control module.

[0048] The Zigbee module model is ZLG M21P2S24E.

[0049] Example 2 like Figure 2 As shown, each multi-source data acquisition node is... Figure 1 The device shown serves as a multi-source data acquisition node in a network system, combining data acquisition, data relay, and communication networking functions. The network system comprises multiple low-power multi-source data fusion acquisition and wireless transmission systems, a data gateway, and a host computer. The specific acquisition and output modules and the corresponding number of channels can be configured according to the specific acquisition requirements of the installation location.

[0050] Each node can be configured as a data acquisition node or a relay node. This function can be adjusted later according to needs.

[0051] (The wireless communication module of the acquisition node is configured as a terminal function, and the wireless communication module of the relay node is configured as a router function. The configuration is performed through the low-power main control module and can be adjusted at any time.) The data acquisition nodes will perform tasks such as intermittent data acquisition and output, data packaging, and wireless transmission.

[0052] The relay node will only perform data forwarding, the wireless communication module and SRAM storage module will be continuously powered, and the acquisition and output module will be powered off.

[0053] Figure 2 The demonstration shows a communication network composed of multiple nodes, each of which can be configured as a data acquisition node or a relay node.

[0054] The data gateway acts as a coordinator to establish the network, the relay node acts as a router to forward and extend the network, and the collection node acts as a terminal device to collect and send data.

[0055] Within a ZigBee network, nodes are interconnected, and the network autonomously plans transmission paths to send data from the collection nodes to the data gateway, which then transmits it to the host computer for analysis, display, and other subsequent tasks.

Claims

1. A multi-source data fusion acquisition system, characterized in that: The system includes a power supply module, a data acquisition and output module, a low-power main control module, a wireless communication module, and an SRAM storage module. The power supply module connects to these modules. The data acquisition and output module is connected to the low-power main control module, which in turn connects to both the wireless communication module and the SRAM storage module. The power supply module provides power to these modules. The data acquisition and output module collects operating data from relevant sensors of the generator set and outputs it to the low-power main control module. The low-power main control module integrates the data collected by the data acquisition and output module, controls the power supply to and from the SRAM storage module, manages data communication, configures and invokes the functions and timing of the wireless communication module, and controls the entire data acquisition process. The system's operating and sleep timings are defined. A wireless communication module transmits or relays data to the low-power main control module and the host computer. An SRAM storage module stores temporary data to be processed and transmitted in the low-power main control module. The low-power main control module includes a step-down module, a microcontroller, a crystal oscillator excitation circuit, and a reset circuit. The microcontroller is connected to the step-down module, crystal oscillator excitation circuit, and reset circuit. The step-down module and microcontroller are connected to a power supply module, and the microcontroller controls the power supply to the power supply module to achieve power management for each module. The microcontroller is also connected to the acquisition and output module, the SRAM storage module, and the wireless communication module. The microcontroller reads data acquired by the acquisition and output module, stores the acquired and temporary data to be processed and transmitted in the SRAM storage module, and communicates with the wireless communication module to achieve data transmission and reception.

2. The multi-source data fusion acquisition system according to claim 1, characterized in that: The power supply module includes a constant power supply module and a controllable branch power supply module; the constant power supply module is used to filter and suppress surges in the input and output power to convert it into a stable power supply, and to supply power to the controllable branch power supply module and the low-power main control module; the controllable branch power supply module is used to control the power supply on and off of the acquisition and output module, the SRAM storage module and the wireless communication module in a coordinated manner through the controllable branch power supply module and the low-power main control module.

3. The multi-source data fusion acquisition system according to claim 2, characterized in that: The step-down module is connected to the constant power supply module; the microcontroller is connected to the PMOS transistor in the controllable branch power supply module, and the microcontroller controls the PMOS transistor to control the on and off of the power supply terminal of the controllable branch power supply module, thereby realizing power management of each module.

4. The multi-source data fusion acquisition system according to claim 3, characterized in that: The constant power supply module filters and suppresses surges in the input 12VDC power supply, converting it into stable 5VDC and 3.3VDC power supplies. The 5VDC and 3.3VDC power supplies power the controllable branch power supply module, while the 3.3VDC power supply powers the low-power main control module.

5. The multi-source data fusion acquisition system according to claim 4, characterized in that: The acquisition and output module includes an analog voltage acquisition module, an analog current acquisition module, a digital switch quantity acquisition module, a digital switch quantity output module, and a digital communication module. The analog voltage acquisition module is used to perform voltage division acquisition and channel protection on the input analog voltage within the ±5V range of the MEMS sensor, ensuring that the acquisition voltage is ≤3.3V. The analog current acquisition module is used to acquire and protect the 4-20mA input analog current of the current output sensor, ensuring that the acquisition voltage is ≤3.3V. The digital switch quantity acquisition module is used for acquiring and channel protection of digital switch quantity of the MEMS sensor and the industrial sensor; the digital communication module is used for establishing UART and I 2 communication of the MEMS sensor, the current output sensor and the industrial sensor with the low-power master control module. The digital switch output module outputs a 5V TTL digital switch signal to the indicator.

6. The multi-source data fusion acquisition system according to claim 5, characterized in that: The digital switch acquisition module is used to clamp and current limit the TTL level switch signals from the MEMS sensor to ensure that the acquisition voltage is ≤3.3V.

7. The multi-source data fusion acquisition system according to claim 6, characterized in that: The digital switch signal acquisition module is used to perform optocoupler isolation on switch signals from external conventional industrial sensors, with a protection voltage of ≥±30V, and to sample and protect the output voltage of the optocoupler to ensure that the acquisition voltage is ≤3.3V.

8. A multi-source data fusion acquisition system according to claim 5, characterized in that: The digital communication module is used for I 2 The C signal undergoes isolation level conversion, and the RS485 communication signal undergoes isolation level conversion to ensure normal communication.

9. A multi-source data fusion acquisition system according to claim 8, characterized in that: The wireless communication module is a Zigbee module, which communicates with the low-power main control module via a serial port. It is used to send data from the low-power main control module to the gateway or other relay nodes via a wireless link, or to receive external data sent by the gateway or other relay nodes and send it back to the low-power main control module.

10. A multi-source data fusion acquisition system according to claim 9, characterized in that: The SRAM storage module communicates with the low-power main control module via the SPI bus and is used to store temporary data to be processed and sent.

11. A multi-source data fusion acquisition system according to claim 10, characterized in that: The temporary data to be processed and sent includes the collected raw data and the summarized data to be sent via the wireless module.

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