US3750036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control
Assignee: Reed International Ltd
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Filing: 1971-10-21
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Granted: 1973-07-31
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Expires: 1991-10-21
Abstract
Abstract A signal representative of the magnitude of a variable is generated and is adjusted in dependence upon a control signal by sampling the signal representative of the variable at predetermined intervals, varying the sampling period in dependence upon changes in the control signal, and integrating the sampled signal to derive a signal which varies as a function of both the amplitude and width of the sample pulses.
Inventors
- 👤 P Burrows
- 👤 I Raymond
- 👤 M Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3084; G; G05; G05B; G05B21/00; G05B21/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
Apparatus for controlling the magnitude of a signal representative of a variable, including, means for sampling a first signal at predetermined intervals, means for varying the sampling period of said sampling means in dependence upon the magnitude of a control variable, and means for integrating the output of the sampling means to derive a signal representative of the magnitude of said first signal adjusted in dependence upon the magnitude of the control signal, said apparatus being adapted to receive an input signal in the form of a series of pulses alternate pulses of which constitute the said first signal and pulses of which between said alternate pulses constitute a signal representative of said control variable, means for applying both said signal pulses and said control pulses to said sampling means and thence to said integrating means, and means for switching the output of the integrating means at the pulse repetition frequency of said series of pulses to separate the parts of the integrating means output respectively pertaining to the first signal and to the control signal into an output channel and into a control channel incorporating the means for varying the sampling period.
Claim 2
Dependent Claim
193 words
Apparatus for controlling the magnitude of a signal representative of a variable, including, means for sampling a first signal at predetermined intervals, means for varying the sampling period of said sampling means in dependence upon the magnitude of a control variable, and means for integrating the output of the sampling means to derive a signal representative of the magnitude of said first signal adjusted in dependence upon the magnitude of the control signal, said apparatus being adapted to receive an input signal in the form of a series of pulses alternate pulses of which constitute the said first signal and pulses of which between said alternate pulses constitute a signal representative of said control variable, means for applying both said signal pulses and said control pulses to said sampling means and thence to said integrating means, and means for switching the output of the integrating means at the pulse repetition frequency of said series of pulses to separate the parts of the integrating means output respectively pertaining to the first signal and to the control signal into an output channel and into a control channel incorporating the means for varying the sampling period.
Claim 3
Dependent Claim
56 words
Apparatus as claimed in claim 1 wherein the sampling means and the means for varying the sampling period respectively comprise a switch for gating the said first signal and a pulse generation circuit responsive to the magnitude of the control signal for controlling the periods during which the switch is gated to pass the sampled signal.
Claim 4
Dependent Claim
67 words
Apparatus as claimed in claim 2 wherein the sampling means includes an electronic switching circuit gated by a multivibrator circuit, the mark: space ratio of the multivibrator circuit being variable in dependence upon the magnitude of the control variable and the switching circuit being gated open to pass the signal to be sampled during one of the mark and the space of the multivibrator circuit output signal.
Claim 5
Dependent Claim
43 words
Apparatus as claimed in claim 1 wherein said control channel incorporates means for comparing the integrated control signal with a reference signal to derive an error signal, and means responsive to said error signal for adjusting the sampling period of the sampling means.
Claim 6
Dependent Claim
77 words
Apparatus as claimed in claim 4 wherein an inverter is coupled to the output of said means for comparing the integrated control signal with a reference signal whereby two paraphase outputs are available from the comparing means and the inverter, the said two paraphase outputs being coupled to a multivibrator circuit for coNtrolling the mark: space ratio thereof, said apparatus including switch means responsive to the output of the multivibrator circuit for sampling the said first-mentioned signal.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 1 including means in said output channel and corresponding means in said control channel for maintaining the level of the signal in the respective channel when the other channel is being supplied from the integrating means.
Claim 8
Dependent Claim
41 words
Apparatus as claimed in claim 5 including means in said output channel and corresponding means in said control channel for maintaining the level of the signal in the respective channel when the other channel is being supplied from the integrating means.
Claim 9
Independent Claim
94 words
A method of controlling the magnitude of a signal representative of a variable comprising, alternately sampling the first-mentioned signal and a control signal at a predetermined frequency, integrating the sampled signals, separating the integrated signals respectively pertaining to the first-mentioned signal and to the control signal into an output channel and into a control channel, and varying the sampling period in dependence upon the magnitude of the signal in said control channel to derive a signal representative of the magnitude of the first-mentioned signal adjusted in dependence upon the magnitude of the control signal.
Claim 10
Independent Claim
94 words
A method of controlling the magnitude of a signal representative of a variable comprising, alternately sampling the first-mentioned signal and a control signal at a predetermined frequency, integrating the sampled signals, separating the integrated signals respectively pertaining to the first-mentioned signal and to the control signal into an output channel and into a control channel, and varying the sampling period in dependence upon the magnitude of the signal in said control channel to derive a signal representative of the magnitude of the first-mentioned signal adjusted in dependence upon the magnitude of the control signal.
References Cited (Backward Citations)
US3229212A
Cited
US3378758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |