CN100386703C - Isolation type electronic servo-controller - Google Patents
Isolation type electronic servo-controller Download PDFInfo
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- CN100386703C CN100386703C CNB2004100467123A CN200410046712A CN100386703C CN 100386703 C CN100386703 C CN 100386703C CN B2004100467123 A CNB2004100467123 A CN B2004100467123A CN 200410046712 A CN200410046712 A CN 200410046712A CN 100386703 C CN100386703 C CN 100386703C
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Abstract
The present invention discloses an isolating electronic servo controller which comprises a valve position signal converting circuit, a valve position output circuit, an input buffer circuit, a dual comparison circuit, a dual triggering circuit, an electric braking pulse forming circuit, a drive circuit, etc. The isolating electronic servo controller is connected to an AI/AO port in a computer system, correctly executes an adjustment control command from the computer system and can control drive motors of valves, etc. with high precision; the isolating electronic servo controller has the advantages of small volume, multiple functions, convenient and easy operation and debugging, long service life, no maintenance, interference resistance, surge resistance, stable operation, reliability and high precision, and is an ideal renewal and generation replacing product in electric executing devices home and abroad at present.
Description
Technical field
The present invention relates to a kind of servo controller, particularly a kind of isolated electron servo controller that is widely used in the automatic control of industries such as metallurgy, electric power, petrochemical industry, light industry, building materials, environmental protection.
Technical background
Industry automatic control generally is to extract the Be Controlled physical quantity from controlling object, the liquid level in the boiler steam bubble for example, promote feed-water valve through calculating, overcome the into disturbance of water and load, towards keeping the constant direction of liquid level to move, it not only requires the control accuracy height, but also very big output torque must be arranged, do not wait to thousands of ox rice from hundreds of ox rice, particularly feedwater and the continuous disturbance of load frequent, the steam bubble liquid level constantly changes, valve will adapt to continuous adjusting, up to 1200 times/hour, big moment is accompanied by frequent starting, stops.Even current modern electronic technology, it also is very big implementing difficulty.Performance element in the homemade electronic combination instrument, be by the DFD manipulater, the ZPE servoamplifier, DJK electric actuator three-major-items are formed, total is that the complicated control accuracy of on line is not high, and fault is many, safeguards and adjusts trouble, can not satisfy the requirement of industry automatic control far away, become the bottleneck that restriction automatic control level improves.In the last few years, China had introduced dissimilar electric actuator from external, and they have his own strong points, and have improved the aggregate level of electric actuator from different aspects, but deficiency is respectively arranged again, and the output torque that has is big inadequately, and the antijamming capability that has is not good enough, the dead band is bigger than normal, safeguards difficulty, and price is high.
Summary of the invention
The object of the invention is to provide a kind of simple in structure, volume is little, precision is high, reliable isolated electron servo controller.
The present invention adopts following proposal to realize: it comprises valve position signal change-over circuit, valve position output circuit, input buffer circuit, dual comparator, two trigger circuit, electric braking pulse shaping circuit, driving circuit, the potentiometer of the input termination actuator of described valve position signal change-over circuit, this potentiometer signal is become voltage signal deliver to the input end of dual comparator and the input end of valve position output circuit respectively, the valve position output circuit carries out V/I conversion back with the output signal of valve position signal change-over circuit and isolates output; The input end of input buffer circuit fetches the signal from computing machine, and its output termination dual comparator becomes the input end that the 1-5V voltage signal is delivered to dual comparator after will cushioning amplification from the 4-20mA current signal of computing machine; The two trigger circuit of the output termination of dual comparator, it compares input signal and valve position signal, produces overgauge signal of output and minus deviation signal, and this signal is delivered to two trigger circuit; The output terminal of two trigger circuit connects the input end of electric braking pulse shaping circuit and driving circuit respectively, and it produces the trigger pip of electric braking pulse shaping circuit and driving circuit; Another input end of the output termination driving circuit of electric braking pulse shaping circuit produces the electric braking pulse in order to the output signal according to two trigger circuit circuit, and delivers to the input end of driving circuit; The output termination motor of driving circuit is in order to the output signal of the two trigger circuit of basis and the forward and backward that motor is controlled in the electric braking pulse.
As improvement of the present invention, the two ends of described input buffer circuit also are connected to safe prewired circuit, and in order to locking input buffer circuit when input signal is unusual, output one preestablishes signal.
Improve as of the present invention another, the valve position output circuit composes in series successively by V/I change-over circuit, linear compensation and from high frequency phase reversal switch, isolated converters, the bridge-type wave detector of multi-harmonic-oscillations.
The present invention is owing to adopt technique scheme, and it possesses following advantage: 1) little, simple in structure, the stable and reliable operation of volume, the operation debugging is easy, precision is high.2) at the two ends of input buffer circuit and connect safe prewired circuit; safe like this prewired circuit can be when input signal be unusual; the locking input buffer circuit; output one preestablishes the home that signal runs to actuator to set in advance; operating personnel can be under not shutdown situation, calm handling failure.Overcome existing break signal and protected when input signal is not normal before the circuit interruption line fault of position, valve can have been misled to the accident of danger position and take place.3) the valve position output circuit adopts isolation structure, has realized the isolation between current input signal and the position output signal, has prevented that effectively power frequency from disturbing together, is convenient to directly connect with control computer, reduces the jamproof pressure of AI/AO in the computing machine.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is an electrical schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, comprise valve position signal change-over circuit 7, valve position output circuit 8, input buffer circuit 1, dual comparator 3, two trigger circuit 4, electric braking pulse shaping circuit 5, driving circuit 6, the potentiometer of the input termination actuator of valve position signal change-over circuit 7, it converts the changing value of valve position to different resistance value, after being incorporated into input end that difference amplifies and getting rid of common mode interference by electric bridge, amplify through adjusting again, the position signalling of the 1-5VDC of generation standard, wherein one tunnel dual comparator 3 input ends of sending into servo amplification form closed-loop control, reach the purpose of accurate location.Valve position output circuit 8 is delivered on another road.The output signal of valve position signal change-over circuit 7 is carried out V/I conversion back isolate output; The input end of input buffer circuit 1 fetches the signal from computing machine, its output termination dual comparator 3, and it will become the input end that the 1-5V voltage signal is delivered to dual comparator 3 after will cushioning amplification from the 4-20mA current signal of computing machine; The two trigger circuit 4 of the output termination of dual comparator 3, it compares input signal and valve position signal, produces overgauge signal of output and minus deviation signal, and this signal is delivered to two trigger circuit 4; The output terminal of two trigger circuit 4 connects the input end of electric braking pulse shaping circuit 5 and driving circuit 6 respectively, and it produces the trigger pip of electric braking pulse shaping circuit and driving circuit; Another input end of the output termination driving circuit 6 of electric braking pulse shaping circuit 5 produces the electric braking pulse in order to the output signal according to two trigger circuit 4, and delivers to the input end of driving circuit 6; The output termination motor of driving circuit 6 is in order to control motor rotation according to the output signal and the electric braking pulse of two trigger circuit 4.
In the foregoing circuit, the two ends of input buffer circuit 1 also are connected to safe prewired circuit 2, and these two circuit lock mutually by input signal.That is to say; when signal changes within 4-20mA; safe prewired circuit 2 is locked; input buffer circuit 1 is not affected; the normal servo function of realizing; in case break down; input signal disconnection or signal are below 3.0mA; input buffer circuit 1 is by locking; start safe prewired circuit 2, actuator will run to the home that sets in advance, and operating personnel can be under not shutdown situation; calm handling failure is again in conjunction with the intrinsic heat protection of topworks; the travel switch protection; cross torque protection; electromechanical stop protections etc. form the perfect protection system of electronic type actuator.
Above-mentioned valve position output circuit 8 composes in series successively by V/I change-over circuit 81, linear compensation and from high frequency phase reversal switch 82, isolated converters 83, the bridge-type wave detector 84 of multi-harmonic-oscillations.
Referring to Fig. 2,1) realization of servo function: servo function is exactly in fact that the aperture of actuator regulator will be followed command signal and changed, that is to say, and be synchronous between them, or proportional.Its function is to be realized by following plurality of units circuit.Command signal from computing machine is passed through R from 4-20mA
1R
2C
1Network switch becomes 1-5V normal voltage signal, amplifies through the IC1A buffering, still at R
8End output 1-5V signal, the effect of this one-level is to filter part from the interference on the lead-in wire, has improved input impedance, has reduced output impedance again simultaneously, is convenient to be connected with next stage IC2A dual comparator.The input of two comparisons has two, and the first is taken from the command signal of R8, and another then is the position signalling that amplifies 8 pin of IC3 from difference, and it also is adjusted to the input/ output terminal 1,2,3 and 12,13,14 and outer meeting resistance R of the 1-5V dual comparator of standard
9, R
10, R
11, R
12And R
13, R
14, R
15, R
16Be symmetrical fully.1 pin of IC2A is just to compare output terminal, and 14 pin of IC2A are negative relatively output terminals.When two input signals equated, positive and negative relatively output terminal be zero potential simultaneously, the positive-negative output end pin 7 of double trigger IC2B and pin 8 simultaneously " being freezed " at-12V, valve is up, descending solid-state relay SSRA and SSRB while locking, motor stop motion.In case the command signal S of input
SGreater than position signalling S
p, and reach a certain designated value Δ (dead band): i.e. S
S-S
p〉=Δ, at this moment, 1 pin of the positive output end IC2A of dual comparator is 〉=Δ, and 14 pin of negative output terminal IC2A are≤-Δ, two trigger circuit 5 pin are higher than triggering level, and 7 pin are from-12V kick to+12V, through R
24, D
3Conducting SSRA, 10 pin of two trigger circuit IC2B then more are lower than former level, negative 8 pin that trigger output terminal IC2B still are locked in-12V, and SSRB continues locking, and motor obtains the positive movement electric current from SSRA, valve is made upstroke, at this moment, valve position sensing potentiometer is also made positive movement thereupon, and the input end 3 pin current potentials of differential amplifier IC3 rise, the current potential of output terminal 8 pin also increases, because this current potential is the anti-end input from dual comparator IC2A, thereby, dual comparator just, negative output terminal 1 pin and 14 pin all change towards zero the direction of becoming, and (lead " Δ ") positive trigger oppositely triggers when dropping to a certain level, 7 pin from+12V drop to-12V closes SSRA, meanwhile, brake pulse forms IC circuit 4A work, produces one moment brake pulse, pass through R
30, D
6, conducting SSRB closes SSRB immediately again, makes the motor acquisition reactive torque of a moment, reaches the purpose of braking.Otherwise, as the same.As input instruction signal S
SLess than position signalling S
p, and reach a certain designated value Δ (dead band): i.e. S
S-S
p≤-Δ, at this moment, 1 pin of the positive output end IC2A of dual comparator is≤-Δ, and 14 pin of negative output terminal IC2A are 〉=Δ, and 10 pin of two trigger circuit IC2B are higher than triggering level, and negative output terminal 8 pin are from-12V kick to+12V, and through R
25, D
5Conducting SSRB, the 5 pin level of two trigger circuit IC2B are then than originally lower, 7 pin that just triggering output terminal IC2B still are-12V, SSRA continues locking, motor obtains the counter motion electric current from SSRB, valve is done downward movement, and at this moment, valve sensing steady arm is also followed and done antiport, the current potential of input end 3 pin of differential amplifier IC3 descends, the current potential of output terminal 8 pin also descends thereupon, because this current potential is the anode input from dual comparator, therefore makes the positive negative output of dual comparator all change towards the direction that becomes zero, (lead " Δ ") negative trigger oppositely triggers when negative output terminal drops to certain to a certain level, level from+12V drop to-12V closes SSRB, meanwhile, brake pulse forms IC circuit 4B work, produce one moment brake pulse, through R
31, D
4, conducting SSRA closes SSRA immediately again, makes the motor acquisition reactive torque of a moment, stop motion rapidly.
2) realization of safe preparatory function: in case signal fault occurs, variable valve or actuator should run to and where just calculate safety under situation out of control.With input buffer circuit and connect the formation interlock circuit, in case the break signal fault occurs, start IC1B at once, output terminal is risen to+the 12V opening from the locking states of-12V, pass through safe presetting potential device R again
6, D
1, at R
8On adjust to any one safety value among the 1-5V, make actuator run to the specified position of this safety signal.Factory setting is 50%.This design is succinctly reliable, and effectively, logic is rigorous, because the home in any one observing and controlling loop is an outwardness, and when it is exactly the control loop operation, the longest position of the valve residence time.It both can find at recollecting on the curve of computer system, especially in operating personnel's brains firmly grasp.External selected guarantor position mode seems rationally, carefully boosts, and is then not rigorous.The so-called position of protecting, be exactly that valve remains on the preceding flashy position of disconnection fault, naturally this position might be safe, might not be safe also, this be because suppose that command signal is not normal before disconnection fault, and valve misled to danger position, broken string just occurs,, also exist really though this probability is little.
3) formation of position signalling:
Having used popularly has the plastics current potential of high resolving power and anti-wear performance to make position sensing at present, and bridge circuit is done the R/V conversion, and as shown in the figure, valve position sensing potentiometer is connected on 3 pin and 12 pin of an arm of electric bridge from differential amplifier circuit, introduces differential signal, R
36Be used for zeroing, R
39Doing to transfer expires, from the standard signal of a single-ended 1-5V of 8 pin output, the E/I change-over circuit that is sent to dual comparator respectively and isolates output.
4) realization of spacing output circuit: the isolation of position signalling is placed on the scene and is made in the servo controller, is an important innovations point of the present invention.As shown in Figure 2, IC5 and Q
3, R
46, R
47, R
48, R
49The E/I conversion of completing place signal; Q
4, Q
5, TF1 and R
50, R
51, R
52, R
53, R
54, D
7, D
8, D
9And C
6Form multi-harmonic-oscillations, produce the HF voltage of 100KC, through D
10, D
11Folk prescription is to conducting, makes Q
3Collector obtain the DC voltage that changes with position signalling, in the secondary high-frequency signal output that different amplitudes are arranged of TF2, pass through D again
12, D
13, D
14, D
15The bridge-type detection, export a high-quality position signalling of having isolated.
Claims (4)
1. isolated electron servo controller, comprise valve position signal change-over circuit, valve position output circuit, input buffer circuit, dual comparator, two trigger circuit, electric braking pulse shaping circuit, driving circuit, the potentiometer of the input termination actuator of described valve position signal change-over circuit, this potentiometer signal is become voltage signal deliver to the input end of dual comparator and the input end of valve position output circuit respectively, the valve position output circuit carries out V/I conversion back with the output signal of valve position signal change-over circuit and isolates output; The input end of input buffer circuit fetches the signal from computing machine, and its output termination dual comparator becomes the input end that the 1-5V voltage signal is delivered to dual comparator after will cushioning amplification from the 4-20mA current signal of computing machine; The two trigger circuit of the output termination of dual comparator, it compares input signal and valve position signal, produces overgauge signal of output and minus deviation signal, and this signal is delivered to two trigger circuit; The output terminal of two trigger circuit connects the input end of electric braking pulse shaping circuit and driving circuit respectively, and it produces the trigger pip of electric braking pulse shaping circuit and driving circuit; Another input end of the output termination driving circuit of electric braking pulse shaping circuit produces the electric braking pulse in order to the output signal according to two trigger circuit, and delivers to the input end of driving circuit; The output termination motor of driving circuit, in order to the output signal of the two trigger circuit of basis and the forward and backward that motor is controlled in the electric braking pulse, it is characterized in that: the two ends of described input buffer circuit also are connected to safe prewired circuit, in order to locking input buffer circuit when input signal is unusual, output one preestablishes signal.
2. isolated electron servo controller according to claim 1 is characterized in that: described valve position output circuit is composed in series successively by V/I change-over circuit, high frequency phase reversal switch, isolated converters, bridge-type wave detector.
3. isolated electron servo controller according to claim 1 is characterized in that: described valve position signal change-over circuit adopts differential amplifier to constitute.
4. isolated electron servo controller according to claim 1, it is characterized in that: described safe prewired circuit is a comparer, the negative input end of comparer connects the 4-20mA signal of computing machine output, reference voltage of the positive input termination of comparer, output terminal forward serial connection diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100467123A CN100386703C (en) | 2004-08-31 | 2004-08-31 | Isolation type electronic servo-controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100467123A CN100386703C (en) | 2004-08-31 | 2004-08-31 | Isolation type electronic servo-controller |
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| Publication Number | Publication Date |
|---|---|
| CN1635432A CN1635432A (en) | 2005-07-06 |
| CN100386703C true CN100386703C (en) | 2008-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100467123A Expired - Fee Related CN100386703C (en) | 2004-08-31 | 2004-08-31 | Isolation type electronic servo-controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107866447B (en) * | 2017-11-01 | 2023-07-14 | 中色科技股份有限公司 | Centering deviation rectifying control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0667730A (en) * | 1992-08-21 | 1994-03-11 | Mitsubishi Heavy Ind Ltd | Hydraulic servo-controller |
| US5623402A (en) * | 1994-02-10 | 1997-04-22 | Schenck Pegasus Corporation | Multi-channel inverse control using adaptive finite impulse response filters |
| CN1260521A (en) * | 1999-01-12 | 2000-07-19 | 长沙日新自动化成套厂 | Multifunctional servo driver |
| CN1464345A (en) * | 2002-06-06 | 2003-12-31 | 长沙日新自动化设备有限责任公司 | Electronic servo controller |
| CN2769973Y (en) * | 2004-08-31 | 2006-04-05 | 龙得云 | Isolating electronic servo controller |
-
2004
- 2004-08-31 CN CNB2004100467123A patent/CN100386703C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0667730A (en) * | 1992-08-21 | 1994-03-11 | Mitsubishi Heavy Ind Ltd | Hydraulic servo-controller |
| US5623402A (en) * | 1994-02-10 | 1997-04-22 | Schenck Pegasus Corporation | Multi-channel inverse control using adaptive finite impulse response filters |
| CN1260521A (en) * | 1999-01-12 | 2000-07-19 | 长沙日新自动化成套厂 | Multifunctional servo driver |
| CN1464345A (en) * | 2002-06-06 | 2003-12-31 | 长沙日新自动化设备有限责任公司 | Electronic servo controller |
| CN2769973Y (en) * | 2004-08-31 | 2006-04-05 | 龙得云 | Isolating electronic servo controller |
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| CN1635432A (en) | 2005-07-06 |
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