Distributed variable sampling rate synchronous data acquisition device based on Ethernet

Abstract

The invention relates to a distributed variable sampling rate synchronous data acquisition device based on an Ethernet. The device comprises a machine case and a bottom plate. The device is characterized by further comprising a power supply module, 1-15 synchronous data acquisition modules and an Ethernet switch which are integrated on the bottom plate. The input end of the power supply module is connected with an external 220V AC power supply. The output end of the power supply module is respectively connected with the synchronous data acquisition modules and the Ethernet switch. All the synchronous data acquisition modules share the same difference sampling clock signal to perform data communication with a far-end host via the Ethernet switch. Synchronous acquisition of as many as 180 paths of analog signals can be met, and configuration is flexible and scalable performance is high with minimum synchronous error of all the synchronous data acquisition modules so that a strictly synchronous coherent relationship can be maintained. Requirements of multichannel, distributed, variable sampling rate and synchronous data acquisition are met so that the device is particularly suitable for long-time, high-capacity, multi-input and full-isolation data acquisition occasions.

Description

technical field [0001] The invention belongs to the technical field of synchronous data acquisition, in particular to an Ethernet-based distributed variable sampling rate synchronous data acquisition device. Background technique [0002] Data acquisition devices, also known as data acquisition systems, are widely used in signal processing, communication, automatic testing, and intelligent instruments. In many cases, it is often required to measure some related signals at the same time, and obtain relevant information between signals after corresponding analysis. , which requires the data acquisition system or device to be able to collect synchronously. In addition, because the number of signals that need to be collected synchronously in the above-mentioned various occasions is as many as hundreds or as few as one or two, and according to different applications, the frequency of changes between the signals that need to be collected synchronously is also very different. Fast-...

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Problems solved by technology

[0004] Chinese patent application 201210592591.7 proposes a "high-speed synchronous data acquisition card". This solution adopts the structure of a motherboard and multiple sub-boards. The final data needs to be transmitted to the host through the PCI bus bridge. In actual use, there must be a host card suitable for the PXI chassis, otherwise the system cannot be used, and the system does not adopt signal isolation technology, and there is no variable sampling rate function. Meet the needs of different applications

[0005] Chinese patent application 201210124366.0 proposes a "transformer vibration monitoring system". This system adopts a six-channel synchronous data acquisition scheme and uses a linear optocoupler to isolate and transmit vibration signals. Although it has good anti-interference performance, the biggest disadvantage of this scheme is that The modular function is weak, the scalability is poor, and it cannot meet the needs of different applications

[0007] Chinese patent application: 200810022841.7 proposes a "multi-channel, high-precision data collector", which is composed of a microprocessor module, an analog measurement module, a power circuit, an isolation circuit, etc., and each data module is connected to the host computer through the MODBUS bus , although synchronous data acquisition can be realized, and the measurement accuracy of each channel can reach one thousandth of the measurement accuracy, but there are few data acquisition channels, which cannot meet the needs of most applications, and the data transmission rate is low and the amount of collected data is small

[0008] To sum up, although there are a large number of applications in today's electronic communication engineering that need to determine the timing and logic relationship of the signal to be tested, and have a large number of input channels and a large amount of data, there is no one that can simultaneously integrate Research results of distributed, modular, variable sampling rate, magnetic isolation, differential synchronization and network data transmission technologies

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