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Valve Feedback System

A feedback system, valve technology, applied in valve devices, mechanical equipment, engine components, etc., to achieve the effect of reducing costs

Active Publication Date: 2020-05-15
MERCURY INSTR CHENGDU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a valve feedback system that can improve the resolution of the valve feedback device under small strokes without significantly increasing the cost of the valve feedback circuit

Method used

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Examples

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Embodiment 1

[0046] Such as image 3 As shown, as an embodiment, the valve feedback system is composed of resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9 form a voltage divider circuit as the bias voltage Vbias output circuit, the voltage divider circuit is used to output a total of 8 output voltages of VREF1~VREF8 as the bias voltage Vbias, the output voltage gradually increases from low to high, and the MCU controls the single-channel 8:1 multi-channel selection switch through REF1_CPU, REF2_CPU, REF3_CPU The 4051D selects one of VREF1~VREF8, that is, the MCU selectively outputs the bias voltage Vbias through a single 8:1 multiplexer 4052D to realize programmable Vbias.

[0047] Resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, resistor R23 and operational amplifier constitute a subtractor and a programmable amplifier, M...

Embodiment 2

[0049] Such as Figure 4 As shown, as an embodiment, the valve feedback system is composed of MCU, ADC, DCA, and PGA. The MCU controls the DAC to output Vbias with different voltage values ​​through the SPI bus. The PGA is configured as a differential amplifier to amplify the difference between Vfb and Vbias After that, Vadc output is generated and sent to ADC, and its amplification factor is configured by MCU through SPI bus. The ADC is connected to the MCU through the SPI bus, and the analog-to-digital conversion is completed in the MCU. The DAC can be a separate chip to complete the DAC function, such as DAC7512, or use the integrated DAC function inside the MCU. PGA can be a separate chip to complete the PGA function, such as PGA280, ADS1286, etc. can be used, or the PGA function integrated inside the MCU can be used.

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PUM

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Abstract

The invention relates to a valve feedback system. The valve feedback system comprises a programmable bias voltage Vbias output circuit and a programmable amplifier; wherein the programmable bias voltage Vbias output circuit can output 0V-+V under the MCU control, and +V is usually the same as the reference voltage of ADC; and the feedback voltage Vfb of a valve feedback potentiometer subtracts Vbias, then is sent into the programmable amplifier, and then is amplified to obtain Vadc, and the Vadc is input into the ADC for analog digital conversion, wherein Vadc=K* (Vfb-Vbias), and K is the magnification coefficient of the programmable amplifier. The valve feedback system can improve the resolution of the valve feedback device under the small stroke without remarkably increasing the cost ofthe valve feedback circuit.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a valve feedback system. Background technique [0002] The valve stem drives the potentiometer to rotate in the valve feedback device, and the different voltage values ​​output by the potentiometer represent different positions of the valve. The feedback device of the existing valve positioner is fixed, and the resolution is low when the stroke is small. In order to achieve sufficient resolution, a high-resolution analog-to-digital converter (ADC) is required, which increases the cost. When the valve positioner is a quarter stroke, the maximum rotation angle of the feedback lever is generally 90°. In the straight stroke, in order to ensure the linearity, the maximum rotation angle of the feedback rod of the valve positioner is generally less than 40° during the straight stroke. In order to meet the needs of different strokes, for straight-stroke valves, valve positioners need ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K37/00
CPCF16K37/0025
Inventor 胡正超雷科扬
Owner MERCURY INSTR CHENGDU CORP
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