US4052642A
Expired / Lapsed
US
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Apparatus for controlling controlled systems with dead time
Assignee: Siemens AG
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Filing: 1976-03-11
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Granted: 1977-10-04
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Expires: 1996-03-11
Abstract
Abstract In controlled systems with dead time, particularly converter current controls, the reference value is fed directly to the final control element providing anticipatory control and, in addition is fed to the reference input of the controller through a dead time simulator. In accordance with a further feature, the difference between the input signal and the output signal of the dead time simulator can be added into the final control element as an additional control variable to compensate for inertia of the controlled system.
Inventors
- 👤 Winfried Speth
- 👤 Walter Dreiseitl
- 👤 Klaus Bohm
- 👤 Lothar Schleicher
- 👤 Herbert Polster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:28
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; G; G05; G05B; G05B13/00; G05B13/02; G05B13/0205; G05B13/024; G05B13/0245
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
In an apparatus for controlling a controlled system, including a final control element with dead time, said apparatus including a controller with an integral characteristic, the improvement comprising: a. means generating a reference value; b. a dead time simulator, the dead time of which corresponds approximately to the dead time of the controlled system, having as in input said reference value and providing an output; c. means associated with said control system providing as an output an actual value of the controlled system; d. first summing means having as inputs the output of said dead time simulator and said actual value, the output of said summing means being coupled as an input to the controller with an integral characteristic whereby said controller will be supplied with a signal dependent upon the difference between the output signal of the dead time simulator and the actual value signal at its input, the output of said controller being coupled as an input to the final control element of said controlled system. e. means coupling said reference value in a bypass path around said dead time simulator and controller so that it forms a further input to the final control element of the controlled system.
Claim 2
Dependent Claim
201 words
In an apparatus for controlling a controlled system, including a final control element with dead time, said apparatus including a controller with an integral characteristic, the improvement comprising: a. means generating a reference value; b. a dead time simulator, the dead time of which corresponds approximately to the dead time of the controlled system, having as in input said reference value and providing an output; c. means associated with said control system providing as an output an actual value of the controlled system; d. first summing means having as inputs the output of said dead time simulator and said actual value, the output of said summing means being coupled as an input to the controller with an integral characteristic whereby said controller will be supplied with a signal dependent upon the difference between the output signal of the dead time simulator and the actual value signal at its input, the output of said controller being coupled as an input to the final control element of said controlled system. e. means coupling said reference value in a bypass path around said dead time simulator and controller so that it forms a further input to the final control element of the controlled system.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1 wherein the controlled system has a gain that is a function of the operating point, and wherein said means coupling the reference value signal to the final control element is a compensating means having a characteristic which compensates for a change in the operating point.
Claim 4
Dependent Claim
22 words
Apparatus according to claim 2, and further including modulation means for adapting the gain of the controller to the controlled system gain.
Claim 5
Dependent Claim
51 words
Apparatus according to the claim 3 wherein the controlled system contains a delay member and further including means for coupling a quantity proportional to the difference between the output and the input signal of said dead time simulator to the input of the final control element as an additional control variable.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 4, and further including first and second further compensating means interposed respectively to between the reference signal and the actual value signal and said first summing means.
Claim 7
Dependent Claim
88 words
Apparatus according to claim 4 wherein said controlled system is a control drive with a line-commutated converter as its final control element and wherein said compensating means includes: a. an amplifier with high no-load gain having as an input a predetermined current reference value from said means generating a reference value; and b. two multipliers which are arranged in series in the negative feedback path of said amplifier, and wherein said modulation means comprise: c. a divider obtaining a divisor input from the junction point of said multipliers.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 6 wherein the output of said compensating means is coupled through a first scaling amplifier and said divisor input through a second scaling amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |