Intelligent measurement and control system

Abstract

The invention discloses an intelligent measurement and control system. The system comprises an ARM microcontroller, a high-precision discrete conversion circuit, a low-temperature-drift linear optocoupler isolation circuit and a communication circuit, and the high-precision discrete conversion circuit, the low-temperature-drift linear optocoupler isolation circuit and the communication circuit arerespectively connected with the ARM microcontroller. The system has the advantages that the analog quantity sampling and output precision is effectively improved, the influence of temperature drift on the measurement precision is reduced, and the measurement and control requirements are met.

Description

technical field [0001] The invention relates to the technical field of measurement and control, in particular to an intelligent measurement and control system. Background technique [0002] Most of the existing measurement and control systems use 51 single-chip microcomputers as the core, which cannot meet the high-performance requirements of intelligent measurement and control equipment in today's "Internet +" and "big data" era. The existing measurement and control system has the following problems: high-precision (20bit and above) AD is not easy to integrate in the microprocessor, the analog sampling accuracy of the measurement and control system is not high, and the high-precision DA is not easy to integrate in the microprocessor. The analog output accuracy of the system cannot reach more than 20bit. AD acquisition experiments usually use direct coupling, which cannot meet the needs of electrical isolation. Even if linear optocoupler isolation is used, there are still so...

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Problems solved by technology

[0002] Most of the existing measurement and control systems use 51 single-chip microcomputers as the core, which cannot meet the high-performance requirements of intelligent measurement and control equipment in today's "Internet +" and "big data" era

The existing measurement and control system has the following problems: high-precision (20bit and above) AD is not easy to integrate in the microprocessor, the analog sampling accuracy of the measurement and control system is not high, and the high-precision DA is not easy to integrate in the microprocessor. The analog output accuracy of the system cannot reach more than 20bit. AD acquisition experiments usually use direct coupling, which cannot meet the needs of electrical isolation. Even if linear optocoupler isolation is used, there are still some problems, such as temperature drift. The measurement accuracy is not high enough to meet During the experiment, it is required to isolate and collect slow-changing analog quantities; the communication experiment circuit is too simple, usually based on the 232 bus or 485 bus based on asynchronous communication, while the CAN bus and Ethernet communication commonly used in the industry have few corresponding experimental circuits. Unable to meet the measurement and control needs

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