Intrinsically safe isolating explosion-proof type analog quantity output system

Abstract

The invention relates to an intrinsically safe isolating explosion-proof type analog quantity output system. The system comprises a signal output circuit, an intrinsically safe energy limiting circuit, a signal transmission modulator circuit, a highway addressable remote transducer (HART) signal demodulation circuit, an HART signal modulator circuit, a signal transmission demodulation circuit, a signal input current limiting circuit, a first transformer, a second transformer and a third transformer, wherein the signal input current limiting circuit is connected with the signal transmission modulator circuit; the signal transmission modulator circuit is connected with the HART signal demodulation circuit; the signal transmission modulator circuit is connected with the signal transmission demodulation circuit by the second transformer; the HART signal demodulation circuit is connected with the HART signal modulator circuit by the third transformer; the signal transmission demodulation circuit is connected with the HART signal modulator circuit and the intrinsically safe energy limiting circuit respectively; and the intrinsically safe energy limiting circuit is connected with the signal output circuit. Compared with the prior art, the intrinsically safe isolating explosion-proof type analog quantity output system has the advantages of low power consumption, explosion prevention function and the like.

Description

technical field [0001] The invention relates to an analog output system, in particular to an intrinsically safe isolation and explosion-proof analog output system. Background technique [0002] In recent years, with the rapid development of my country's economy, higher and higher requirements have been put forward for the development of industrial automation. The demand for the number of industrial automation control system equipment has increased sharply, and its scale has also become larger. At present, most of the electrical equipment used in our industrial control systems and systems are imported from abroad, especially in some large and medium-sized projects, such as petrochemical, metallurgy, pharmaceutical, shipbuilding and other industries. According to market research, these industries have an urgent need to reduce the system cost. However, due to the use of imported products, it is difficult to reduce the hardware cost and maintenance and repair costs of the system...

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Problems solved by technology

According to market research, these industries have an urgent need to reduce the system cost, but due to the use of imported products, it is difficult to reduce the hardware cost and maintenance and repair costs of the system, which hinders the expansion of the system scale

At the same time, in order to quickly enter and occupy the market, some domestic suppliers cut costs regardless of product performance and quality in order to reduce sales prices. Advantages to fight price wars and compete in low profit margins

It eventually led to a vicious circle, slow development of national industry, poor independent development capabilities, and intensified polarization with foreign industrial products

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