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

A valve positioner, smart electrical technology, applied in the direction of using feedback control, etc., can solve problems such as bulky, unstable work, difficult to guarantee accuracy, etc.

Inactive Publication Date: 2005-08-17
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

In the prior art in this field, the implementation of the power conversion circuit is to convert the input current into a lower voltage first, 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

Method used

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

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Embodiment Construction

[0036] Normally, for a two-wire positioner, the input current signal range is 4-20mA, and this signal is used as a positioning signal, and at the same time provides the required energy for the positioner. The total current consumption of the system must be less than the minimum current requirement of the loop (that is, to ensure that the circuit can still work normally under the condition of a minimum current of 4mA). In order to leave a certain margin and to be compatible with the smart transmitter based on the HART protocol, the upper limit of the maximum consumption current of the entire circuit is designed to be 3.5mA. It is precisely because the two-wire system has strict requirements on power consumption, so the design and optimization of the control circuit is the key to the realization of the technical solution of the present invention, and the overall design of the present invention revolves around how to achieve low power consumption.

[0037] The intelligent two-wir...

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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...

Claims

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Application Information

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IPC IPC(8): G05D3/12
Inventor 王化祥王群增林慧肖素枝逯大军郝魁红
Owner TIANJIN UNIV
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