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US4160922A
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Method of generating a direct current control signal from a noisy alternating current signal
Assignee: ExxonMobil Upstream Research Co
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Filing: 1977-08-02
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Granted: 1979-07-10
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Expires: 1997-08-02
Abstract
Abstract A DC signal is generated having a amplitude related to the amplitude of an AC signal, with minimal delay and low sensitivity to noise in the AC signal.
Inventors
- 👤 James E. Rickenbacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:00
CPC Classifications
H; H03; H03D; H03D1/00; G; G01; G01R; G01R19/00; G01R19/22; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
Apparatus for generating a direct current output signal proportional to the amplitude of an alternating current signal comprising: a rectifier, said rectifier being responsive to said alternating current signal for generating a rectified output signal related to said alternating current signal; integrator means for integrating the rectified output signal from said rectifier for a selected number of half cycles of said alternating current signal, said integrator means including means responsive to a variable control signal for varying the integrating time constant of said integrator means; and means for sampling the output level of said integrator means and for holding the sampled output level for a selected time.
Claim 2
Dependent Claim
107 words
Apparatus for generating a direct current output signal proportional to the amplitude of an alternating current signal comprising: a rectifier, said rectifier being responsive to said alternating current signal for generating a rectified output signal related to said alternating current signal; integrator means for integrating the rectified output signal from said rectifier for a selected number of half cycles of said alternating current signal, said integrator means including means responsive to a variable control signal for varying the integrating time constant of said integrator means; and means for sampling the output level of said integrator means and for holding the sampled output level for a selected time.
Claim 3
Dependent Claim
60 words
The apparatus of claim 1 wherein said means responsive to a variable control signal for varying the integrating time constant of said integrator means comprises a switching means in series with a resistor, said switching means adapted to being alternately switched to conducting and nonconducting states in response to said control signal to vary the effective value of said resistor.
References Cited (Backward Citations)
US3717818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |