CN201673413U - Intelligent valve positioner position feedback device - Google Patents
Intelligent valve positioner position feedback device Download PDFInfo
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- CN201673413U CN201673413U CN2010201177805U CN201020117780U CN201673413U CN 201673413 U CN201673413 U CN 201673413U CN 2010201177805 U CN2010201177805 U CN 2010201177805U CN 201020117780 U CN201020117780 U CN 201020117780U CN 201673413 U CN201673413 U CN 201673413U
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Abstract
The utility model relates to an intelligent valve positioner position feedback device which has the advantages of precise valve position feedback and strong anti-interference capability, and can transmit the valve position information to a DCS industrial distribution control system in real time. The technical scheme is as follows: in the intelligent valve positioner position feedback device, a valve displacement sensor signal output end is connected with a signal conditioning circuit, the signal output end of the signal conditioning circuit is connected with an A/D transfer switch and the signal output end of the A/D transfer circuit is connected with a microprocessor; and the device is characterized in that the PWM signal output end of the microprocessor is connected with an electrical isolation circuit, the signal output end of the electrical isolation circuit is connected with a trigger, the signal output end of the trigger is connected with a filter isolation circuit, the signal output end of the filter isolation circuit is connected with a current loop circuit, and the signal output end of the current loop circuit is connected with a control unit.
Description
Technical field
The utility model relates to a kind of intelligent valve positioner position feedback device.
Background technology
In the prior art, the valve position feedback of intelligent valve positioner mainly contains following several mode: the one, adjust sliding shoe, and tongue tube or realize the feedback of valve position near switch, this method precision is low, is difficult to measure when micro-stroke; The 2nd, adopt the capacitive position feedback, by measuring the variation of capacitance, determine valve position, this method anti-interference is poor, and debugging is complicated in producing.The 3rd, electronic valve position transmitter, it drives magnetic core by cam-and-and moves in two magnetic test coils, and two coil currents change, and difference is amplified the back as feedback signal, and this method is subject to electromagnetic interference (EMI), and it is bad to be subjected to hysteresis characteristic to influence repeatability.The 4th, electronic type valve position signal feedback device utilizes electronic technology to realize that the diode of valve open and close shows and the storage of open and close position, and it can not accurately feed back valve position, can not export the 4-20mA signal, therefore can not be used for DCS industry Distributed Control System (DCS).
The utility model content
Goal of the invention of the present utility model is to provide a kind of intelligent valve positioner position feedback device, and valve position feedback is accurate, antijamming capability is strong, valve position information can be sent in real time DCS industry Distributed Control System (DCS).
Realize the technical scheme of the present utility model purpose:
A kind of intelligent valve positioner position feedback device, valve displacement transducer signal output termination signal conditioning circuit, the signal conditioning circuit signal output part connects the A/D change-over circuit, A/D change-over circuit signal output part connects microprocessor, it is characterized in that: microprocessor pwm signal output termination electrical isolation circuit, electrical isolation circuit signal output terminal connects trigger, flop signal output termination filtering buffer circuit, filtering buffer circuit signal output part connects current loop circuit, and the current loop circuit signal output part connects control module.
The electrical isolation circuit has electric capacity (C1), photoisolator (U1), (U2), the negative end of the middle light emitting diode of the forward end of light emitting diode and photoisolator (U2) is joined in the signal output part of electric capacity (C1) and the photoisolator (U1), and the signal output part of photoisolator (U1), (U2) connects trigger.
The electrical isolation circuit also has electric capacity (C2), photoisolator (U3), reset signal output termination capacitor (C2), the negative end of light emitting diode is joined in the signal output part of electric capacity (C2) and the photoisolator (U3), and the signal output part of photoisolator (U3) connects trigger.
The filtering buffer circuit has low-pass filter circuit and voltage follow chip (U5), low-pass filter circuit is connected and composed by resistance (R1) and electric capacity (C3), the signal output part of low-pass filter circuit connects voltage follow chip (U5), and the signal output part of voltage follow chip (U5) connects current loop circuit.
Current loop circuit has electric current loop chip (U6) and triode (V1), and the signal output part of electric current loop chip connects the signal input part of triode (V1), and the signal output part of triode (V1) connects control module.
Control module can be the collecting and distributing DCS control system of industry.
Trigger can be the rising edge d type flip flop.
The beneficial effect that the utlity model has:
The utility model can feed back the valve position state in real time, does not have time-delay and lags behind, and adjustment is simple.The utility model has further strengthened the antijamming capability of valve position feedback device by the electrical isolation circuit, is subjected to environmental impact such as temperature electromagnetism little; By current loop circuit, further guaranteed high sensitivity, high precision and the high reliability of valve position feedback, the linear relationship between valve position and the output current is good.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model electrical isolation circuit and trigger part;
Fig. 2 is the circuit theory diagrams of filtering buffer circuit and current loop circuit part.
Embodiment
Valve displacement transducer signal output termination signal conditioning circuit, the signal conditioning circuit signal output part connects the A/D change-over circuit, and A/D change-over circuit signal output part connects microprocessor, and this is a prior art, and is shared with intelligent valve positioner.
As shown in Figure 1, microprocessor pwm signal output terminal (PWM-in) connects the electrical isolation circuit, electrical isolation circuit signal output terminal meets trigger U4, trigger U4 is the rising edge d type flip flop, as shown in Figure 2, trigger U4 signal output part (PWM-out) connects the filtering buffer circuit, and filtering buffer circuit signal output part connects current loop circuit, the current loop circuit signal output part meets control module U7, and control module U7 is industrial collecting and distributing DCS control system.
As shown in Figure 1, the electrical isolation circuit has capacitor C 1, photoisolator U1, U2, among the signal output part of capacitor C 1 and the photoisolator U1 among the forward end of light emitting diode and the photoisolator U2 negative end of light emitting diode join, the signal output part of photoisolator U1, U2 meets trigger U4.The electrical isolation circuit also has capacitor C 2, photoisolator U3, reset signal output terminal (REST) connects capacitor C 2, the negative end of light emitting diode is joined among the signal output part of capacitor C 2 and the photoisolator U3, and the signal output part of photoisolator U3 meets trigger U4.
As shown in Figure 2, the filtering buffer circuit has low-pass filter circuit and voltage follow chip U5, low-pass filter circuit is connected and composed by resistance R 1 and capacitor C 3, and the signal output part of low-pass filter circuit meets voltage follow chip U5, and the signal output part of voltage follow chip U5 connects current loop circuit.Current loop circuit has electric current loop chip U6 and triode V1, and the signal output part of electric current loop chip connects the signal input part of triode V1, and the signal output part of triode V1 meets control module U7.
Pwm signal produces positive spike pulse by after the capacitor C 1 at rising edge, and negative edge produces negative spike pulse.Positive spike pulse makes photoisolator U1 work, makes trigger U4 output high level; Negative spike pulse makes photoisolator U2 work, make trigger U4 output low level, thereby the output terminal of trigger U4 restores pwm signal.Reset signal produces negative spike pulse by capacitor C 2, makes photoisolator U3 work, makes trigger U4 force set, even the zero clearing of trigger U4 output terminal resets.
Pwm signal by trigger U4 output produces d. c. voltage signal through the low-pass filter circuit of being made up of resistance R 1 and capacitor C 3, and this d. c. voltage signal enters voltage follow chip U5, makes magnitude of voltage constant, improves driving force, reduces the influence to front stage circuits.The signal of voltage follow chip U5 output enters electric current loop chip U6, and triode V1 is to control module U7 output and the corresponding 4MA-20MA electric current of valve position.Stabilivolt V2 can play the effect to electric current loop chip U6 voltage-stabilizing protection, and diode V3 carries out reverse-voltage protection to electric current loop chip U6.
Claims (7)
1. intelligent valve positioner position feedback device, valve displacement transducer signal output termination signal conditioning circuit, the signal conditioning circuit signal output part connects the A/D change-over circuit, A/D change-over circuit signal output part connects microprocessor, it is characterized in that: microprocessor pwm signal output termination electrical isolation circuit, electrical isolation circuit signal output terminal connects trigger, flop signal output termination filtering buffer circuit, filtering buffer circuit signal output part connects current loop circuit, and the current loop circuit signal output part connects control module.
2. intelligent valve positioner position feedback device according to claim 1, it is characterized in that: the electrical isolation circuit has electric capacity (C1), photoisolator (U1, U2), the negative end of the middle light emitting diode of the forward end of light emitting diode and photoisolator (U2) is joined in the signal output part of electric capacity (C1) and the photoisolator (U1), and the signal output part of photoisolator (U1, U2) connects trigger.
3. intelligent valve positioner position feedback device according to claim 2, it is characterized in that: the electrical isolation circuit also has electric capacity (C2), photoisolator (U3), reset signal output termination capacitor (C2), the negative end of light emitting diode is joined in the signal output part of electric capacity (C2) and the photoisolator (U3), and the signal output part of photoisolator (U3) connects trigger.
4. intelligent valve positioner position feedback device according to claim 3, it is characterized in that: the filtering buffer circuit has low-pass filter circuit and voltage follow chip (U5), low-pass filter circuit is connected and composed by resistance (R1) and electric capacity (C3), the signal output part of low-pass filter circuit connects voltage follow chip (U5), and the signal output part of voltage follow chip (U5) connects current loop circuit.
5. intelligent valve positioner position feedback device according to claim 4, it is characterized in that: current loop circuit has electric current loop chip (U6) and triode (V1), the signal output part of electric current loop chip connects the signal input part of triode (V1), and the signal output part of triode (V1) connects control module.
6. according to any one described intelligent valve positioner position feedback device of claim 1-5, it is characterized in that: control module can be the collecting and distributing DCS control system of industry.
7. according to any one described intelligent valve positioner position feedback device of claim 1-5, it is characterized in that: trigger can be the rising edge d type flip flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201177805U CN201673413U (en) | 2010-02-24 | 2010-02-24 | Intelligent valve positioner position feedback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201177805U CN201673413U (en) | 2010-02-24 | 2010-02-24 | Intelligent valve positioner position feedback device |
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| Publication Number | Publication Date |
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| CN201673413U true CN201673413U (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201177805U Expired - Lifetime CN201673413U (en) | 2010-02-24 | 2010-02-24 | Intelligent valve positioner position feedback device |
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| CN (1) | CN201673413U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080735A (en) * | 2011-02-23 | 2011-06-01 | 合肥工业大学 | Piezoelectric switch type valve positioner control method and piezoelectric switch type valve positioner control system |
| CN102790528A (en) * | 2011-05-16 | 2012-11-21 | 上海华建电力设备股份有限公司 | Simple electric isolated DC analog transmitting output module |
| CN105763183A (en) * | 2015-12-14 | 2016-07-13 | 重庆川仪自动化股份有限公司 | AI module provided with current isolation circuit, and current isolation circuit |
| CN106943190A (en) * | 2017-04-25 | 2017-07-14 | 天津市鹰泰利安康医疗科技有限责任公司 | A kind of two-way steep-sided pulse system of tumor treatment |
-
2010
- 2010-02-24 CN CN2010201177805U patent/CN201673413U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080735A (en) * | 2011-02-23 | 2011-06-01 | 合肥工业大学 | Piezoelectric switch type valve positioner control method and piezoelectric switch type valve positioner control system |
| CN102080735B (en) * | 2011-02-23 | 2012-05-30 | 合肥工业大学 | Piezoelectric switch type valve positioner control system |
| CN102790528A (en) * | 2011-05-16 | 2012-11-21 | 上海华建电力设备股份有限公司 | Simple electric isolated DC analog transmitting output module |
| CN105763183A (en) * | 2015-12-14 | 2016-07-13 | 重庆川仪自动化股份有限公司 | AI module provided with current isolation circuit, and current isolation circuit |
| CN105763183B (en) * | 2015-12-14 | 2018-08-03 | 重庆川仪自动化股份有限公司 | Equipped with the AI modules for being galvanically isolated circuit and it is galvanically isolated circuit |
| CN106943190A (en) * | 2017-04-25 | 2017-07-14 | 天津市鹰泰利安康医疗科技有限责任公司 | A kind of two-way steep-sided pulse system of tumor treatment |
| CN106943190B (en) * | 2017-04-25 | 2023-09-12 | 天津市鹰泰利安康医疗科技有限责任公司 | Bidirectional steep pulse tumor treatment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101215 |