US3732501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redundant operational amplifier circuit for servo control systems
Assignee: RTX Corp
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Filing: 1971-09-27
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Granted: 1973-05-08
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Expires: 1991-09-27
Abstract
Abstract A redundant type servo valve control system is disclosed which employs a circuit comprising two simultaneously operating control loop channels for protecting against a failure in the control channel. Each channel includes an operational amplifier having one input terminal grounded and the other input terminal connected to a substantially identical input source of error signal. The output from each operational amplifier is fed back to its error signal input terminal through a servo valve load which is common to both channels. Only one feedback loop can be satisfied, so that one of the amplifiers is saturated and the other operates linearly to provide an output in such a manner as to control the amount of the output current from both amplifiers which flows through the servo valve load.
Inventors
- 👤 W Fischer
- 👤 F Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:56
CPC Classifications
G; G05; G05B; G05B9/00; G05B9/02; G05B9/03; G05D; G05D1/00; G05D1/0055; G05D1/0077; H; H03; H03F; H03F1/00; H03F1/52; H03F1/526
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
In a control system for a controlled device in which first and second redundant control channels produce respectively first and second error signals for independently controlling said controlled device, said signals being substantially identical during normal operation, the improvement which comprises an amplifier circuit connected between said control channels and said controlled device, said circuit including, a first operational amplifier having a first input terminal connected to receive said first error signal, a first negative feedback circuit connecting the output from said first operational amplifier with said first input terminal, said first feedback circuit including a load for actuating said controLled device, a second operational amplifier having a second input terminal connected to receive said second error signal, and a second negative feedback circuit connecting the output from said second operational amplifier with said second input terminal, said second feedback circuit also including said load whereby the feedback current in each of said first and second feedback circuits passes through said load.
Claim 2
Dependent Claim
162 words
In a control system for a controlled device in which first and second redundant control channels produce respectively first and second error signals for independently controlling said controlled device, said signals being substantially identical during normal operation, the improvement which comprises an amplifier circuit connected between said control channels and said controlled device, said circuit including, a first operational amplifier having a first input terminal connected to receive said first error signal, a first negative feedback circuit connecting the output from said first operational amplifier with said first input terminal, said first feedback circuit including a load for actuating said controLled device, a second operational amplifier having a second input terminal connected to receive said second error signal, and a second negative feedback circuit connecting the output from said second operational amplifier with said second input terminal, said second feedback circuit also including said load whereby the feedback current in each of said first and second feedback circuits passes through said load.
Claim 3
Dependent Claim
15 words
A control system as in claim 1 in which said load is a servo valve.
Claim 4
Dependent Claim
36 words
A control system as in claim 1 and including a current amplifier connected between each said operational amplifier and said load, and current attenuating means connected between said load and said first and second input terminals.
Claim 5
Dependent Claim
223 words
In a control system for a controlled device in which first and second redundant control channels produce respectively first and second error signals for independently controlling said controlled device, said error signals being substantially identical during normal operation, an amplifier circuit connected between said control channels and said controlled device, said amplifier circuit comprising first and second operational amplifiers each having an input terminal and each having a negative feedback loop connecting the output from each amplifier with its respective input terminal, each said feedback loop containing a load common to both feedback paths, said load producing an output signal for actuating said controlled device, the input terminal of each of said operational amplifiers being connected to receive one of said error signals as an input thereto, a deviation between said error signals in which one of said error signals is of a larger magnitude but of the same polarity as said other error signal causing the amplifier circuit to which said larger magnitude error signal is connected to saturate and producing no change in the output signal from said load, a deviation between said error signals in which one of said error signals is of the opposite polarity from said other error signal causing both of said amplifier circuits to saturate and causing the output signal from said load to be zero.
Claim 6
Dependent Claim
223 words
In a control system for a controlled device in which first and second redundant control channels produce respectively first and second error signals for independently controlling said controlled device, said error signals being substantially identical during normal operation, an amplifier circuit connected between said control channels and said controlled device, said amplifier circuit comprising first and second operational amplifiers each having an input terminal and each having a negative feedback loop connecting the output from each amplifier with its respective input terminal, each said feedback loop containing a load common to both feedback paths, said load producing an output signal for actuating said controlled device, the input terminal of each of said operational amplifiers being connected to receive one of said error signals as an input thereto, a deviation between said error signals in which one of said error signals is of a larger magnitude but of the same polarity as said other error signal causing the amplifier circuit to which said larger magnitude error signal is connected to saturate and producing no change in the output signal from said load, a deviation between said error signals in which one of said error signals is of the opposite polarity from said other error signal causing both of said amplifier circuits to saturate and causing the output signal from said load to be zero.
References Cited (Backward Citations)
US2536651A
Cited
US3489889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |