Intelligent two-wire system electropneumatic valve positioner and control method therefor

Abstract

An intelligent two-line electric value locator includes a circuit control unit, an IP electric conversion unit and a value position test feedback unit, among which, the input signal and the value position feedback signal enter into a microprocessor control unit of the control circuit of said intelligent electric value locator for comparing, a control signal is output to the I / P electric conversion unit based on difference of the two to control the motion of its output gas pressure and value rod of a pneumatic control value, the stroke of rod is feedback to the circuit control unit to form a closed-loop control. The invention takes the microprocessor as the control core, applies an electric balance principle to substitute the traditional mechanical balance theory and convert electric control instruction to pneumatic positioning gain to control value positions accurately.

Description

technical field [0001] The invention relates to an electric regulating valve positioner, in particular to an intelligent electric regulating valve positioner system and a control method thereof. Background technique [0002] With the progress of industry, the positioner of electric control valve has developed from the original positioner based on pure pneumatic and mechanical force balance to the later electric / pneumatic valve positioner based on electromagnetic conversion, until today's intelligent valve positioner. type and positioners using fieldbus technology. Its general trend is electrification, intelligent operation and control, and it will be compatible with all-digital industrial control. [0003] At present, the positioners used in my country are mainly mechanical positioners based on the principle of force balance, which use nozzle-baffle technology. This kind of positioner is easy to wear during use, and it is usually necessary to repeatedly adjust a series of s...

AI Technical Summary

Problems solved by technology

In the prior art in this field, the implementation of the power conversion circuit is to first convert the input current into a lower voltage, then generate oscillation through the oscillator, and finally obtain the required voltage value through rectification, filtering and linear voltage stabilization. However, this The disadvantage of the solution is that the key part of the circuit (transformer) needs to be wound by itself

It is precisely because of the limitation of the process of winding transformers that it is difficult to guarantee the accuracy of such products, the consistency of operation results is poor, the work is unstable, and the power consumption is large, and the volume is also very large.

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