US3758838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic circuit
Assignee: Rank Organization Ltd
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Filing: 1971-12-22
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Granted: 1973-09-11
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Expires: 1991-12-22
Abstract
Abstract An electronic circuit which gives an output corresponding to a first input so long as that output is within limits set by a second input. When the output goes beyond these limits, a diode connected thereto is forward biased to establish a high loop gain feedback path holding the output constant.
Inventors
- 👤 K Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:45
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1427
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
An electronic circuit for developing an output signal in response to two independently variable input signals, comprising: means coupled to receive one of said input signals for developing a first signal as a function of said one input signal, means coupled to receive the other of said input signals for developing a second signal proportional to said other input signal, first comparison means coupled to compare said first and second signals, second comparison means connected to compare said first signal with the inverse of said second signal, and switching means operative to pass said first signal as the output signal from said circuit when said first signal lies between said second signal and the inverse thereof, and to pass said second signal as the output from said circuit when said first signal lies outside the limits determined by said second signal and its inverse.
Claim 2
Dependent Claim
144 words
An electronic circuit for developing an output signal in response to two independently variable input signals, comprising: means coupled to receive one of said input signals for developing a first signal as a function of said one input signal, means coupled to receive the other of said input signals for developing a second signal proportional to said other input signal, first comparison means coupled to compare said first and second signals, second comparison means connected to compare said first signal with the inverse of said second signal, and switching means operative to pass said first signal as the output signal from said circuit when said first signal lies between said second signal and the inverse thereof, and to pass said second signal as the output from said circuit when said first signal lies outside the limits determined by said second signal and its inverse.
Claim 3
Dependent Claim
78 words
A circuit as claimed in claim 1, including further comparison means for comparing the inverse of said second signal with said first signal and in which the switching means is arranged to pass said first signal as the output signal when the first signal lies between the second signal and its inverse and to pass the second signal as the output signal when the first signal is outside the limits set by the second signal and iTs inverse.
Claim 4
Dependent Claim
16 words
A circuit as claimed in claim 1, in which the comparison means comprises an operational amplifier.
Claim 5
Dependent Claim
36 words
A circuit as claimed in claim 3, in which the switching means comprises a diode connected in series with the operational amplifier and arranged to be forward or reverse biased in accordance with the amplifier output.
Claim 6
Dependent Claim
43 words
A circuit as claimed in claim 4, in which the means for developing the first signal comprises a further operational amplifier arranged to compare said one input signal with a reference signal and to produce said first signal proportional to the difference therebetween.
Claim 7
Dependent Claim
34 words
A circuit according to claim 5 in which the forward biasing of said diode establishes a high loop gain path including the operational amplifier and the further operational amplifier to limit the output signal.
Claim 8
Dependent Claim
93 words
A servo system including a circuit as claimed in claim 5, an actuator for providing movement in response to the output signal from the circuit, a feedback transducer arranged to produce a signal representing the position of the actuator which signal is applied to the circuit as said other input signal, and a demand unit arranged to provide signals representing the desired position of the actuator and the maximum desired rate of movement of the actuator which signals are applied to the circuit as said reference signal and said one input signal respectively.
Claim 9
Independent Claim
133 words
A method of controlling the movement of an actuator comprising the steps of: providing a position demand signal representative of the desired position of said actuator, detecting the actual position of the actuator and providing a feedback signal representative thereof, providing a rate demand signal representative of the maximum desired rate of movement of said actuator, comparing said position demand signal and said feedback signal to obtain an error signal, comparing said error signal with the inverse of said rate demand signal, and driving said actuator in accordance with said error signal when said error signal lies between said rate demand signal and its inverse, and driving said actuator in accordance with said rate demand signal when said error signal lies outside the limits set by said rate demand signal and its inverse.
Claim 10
Independent Claim
133 words
A method of controlling the movement of an actuator comprising the steps of: providing a position demand signal representative of the desired position of said actuator, detecting the actual position of the actuator and providing a feedback signal representative thereof, providing a rate demand signal representative of the maximum desired rate of movement of said actuator, comparing said position demand signal and said feedback signal to obtain an error signal, comparing said error signal with the inverse of said rate demand signal, and driving said actuator in accordance with said error signal when said error signal lies between said rate demand signal and its inverse, and driving said actuator in accordance with said rate demand signal when said error signal lies outside the limits set by said rate demand signal and its inverse.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |