US3717818A
Expired / Lapsed
US
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Instantaneous voltage detector
Assignee: Individual
•
Filing: 1972-01-10
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Granted: 1973-02-20
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Expires: 1992-01-10
Abstract
Abstract An apparatus for indicating the amplitude of an alternating voltage signal including first and second cyclically operating signal integrators which periodically integrate the alternating voltage signal and a reference D.C. signal related to the nominal or desired amplitude of the alternating voltage signal. The integrators operate in synchronism with the alternating voltage signal. The two integrated signals are periodically compared for amplitude and polarity differences. There is also provided means for periodically comparing the integrated alternating voltage signal with another reference D.C. signal representing the nominal or desired frequency thereof to indicate the instantaneous frequency of the alternating voltage signal.
Inventors
- 👤 J Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:47
CPC Classifications
G; G05; G05B; G05B1/00; G05B1/01; G05B1/02; G01; G01R; G01R19/00; G01R19/165; G01R19/16566; G01R19/16576; G01R19/1658; H; H02; H02H; H02H3/00; H02H3/08; H02H3/46
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
149 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first cyclically operating signal integrator means for integrating the alternating voltage signal for a given period of time during each cycle, a second cyclically operating signal integrator means for integrating the D.C. reference signal for a given period of time during each cycle, means for synchronizing the cyclical operation of said first and second signal integrator means and comprising means for periodically comparing the integrated signals from said signal integRator means to generate a signal whose value is related to the deviation of the instantaneous value of the amplitude of the alternating voltage signal from said nominal value, wherein said second signal integrator means cyclically operates at the frequency of the alternating voltage signal.
Claim 2
Dependent Claim
149 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first cyclically operating signal integrator means for integrating the alternating voltage signal for a given period of time during each cycle, a second cyclically operating signal integrator means for integrating the D.C. reference signal for a given period of time during each cycle, means for synchronizing the cyclical operation of said first and second signal integrator means and comprising means for periodically comparing the integrated signals from said signal integRator means to generate a signal whose value is related to the deviation of the instantaneous value of the amplitude of the alternating voltage signal from said nominal value, wherein said second signal integrator means cyclically operates at the frequency of the alternating voltage signal.
Claim 3
Dependent Claim
149 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first cyclically operating signal integrator means for integrating the alternating voltage signal for a given period of time during each cycle, a second cyclically operating signal integrator means for integrating the D.C. reference signal for a given period of time during each cycle, means for synchronizing the cyclical operation of said first and second signal integrator means and comprising means for periodically comparing the integrated signals from said signal integRator means to generate a signal whose value is related to the deviation of the instantaneous value of the amplitude of the alternating voltage signal from said nominal value, wherein said second signal integrator means cyclically operates at the frequency of the alternating voltage signal.
Claim 4
Dependent Claim
149 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first cyclically operating signal integrator means for integrating the alternating voltage signal for a given period of time during each cycle, a second cyclically operating signal integrator means for integrating the D.C. reference signal for a given period of time during each cycle, means for synchronizing the cyclical operation of said first and second signal integrator means and comprising means for periodically comparing the integrated signals from said signal integRator means to generate a signal whose value is related to the deviation of the instantaneous value of the amplitude of the alternating voltage signal from said nominal value, wherein said second signal integrator means cyclically operates at the frequency of the alternating voltage signal.
Claim 5
Dependent Claim
74 words
Apparatus as in claim 1 and further comprising means for generating another D.C. reference signal having an amplitude related to the nominal frequency of the alternating voltage signal and another signal comparing means for periodically comparing the integrated signal from said second signal integrator means with the other D.C. reference signal to generate a signal whose value is related to the deviation of the frequency of the alternating voltage signal from said nominal frequency.
Claim 6
Dependent Claim
143 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for generating a pulse signal during each cycle of the alternating voltage signal when said signal has a particular amplitude value, means for detecting the instantaneous amplitude of the alternating voltage signal, means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first signal integrator means for integrating the instantaneous amplitude of the alternating voltage signal, a second signal integrator means for integrating the D.C. reference signal, said first and second signal integrator means being recycled in response to said pulse signal, signal comparator means operative in response to said pulse signal for comparing instantaneous values of the integrated signals from said signal integrator means at a given instant in each cycle of the alternating voltage signal.
Claim 7
Dependent Claim
143 words
Apparatus for indicating the amplitude of an alternating voltage signal comprising means for generating a pulse signal during each cycle of the alternating voltage signal when said signal has a particular amplitude value, means for detecting the instantaneous amplitude of the alternating voltage signal, means for providing a D.C. reference signal having an amplitude related to a nominal value of the amplitude of the alternating voltage signal, a first signal integrator means for integrating the instantaneous amplitude of the alternating voltage signal, a second signal integrator means for integrating the D.C. reference signal, said first and second signal integrator means being recycled in response to said pulse signal, signal comparator means operative in response to said pulse signal for comparing instantaneous values of the integrated signals from said signal integrator means at a given instant in each cycle of the alternating voltage signal.
Claim 8
Dependent Claim
21 words
Apparatus as in claim 3 wherein said signal comparator means includes signal sample and hold means and a signal amplitude comparator.
Claim 9
Dependent Claim
91 words
Apparatus as in claim 3 wherein said signal comparator means comprises first and second signal sample and hold means each triggered to operate in response to said pulse signal, and a signal amplitude comparator, said first signal sample and hold means having an input connected to the output of said first signal integrator means and an output connected to said signal comparator, and said second signal sample and hold means having an input connected to the output of said second signal integrator means and an output connected to said signal comparator.
Claim 10
Dependent Claim
50 words
Apparatus as in claim 5 wherein said pulse signal generating means is a zero crossing detector circuit whose output is connected to both said sample and hold means, and a pulse delay means connecting the output of said zero crossing detector circuit to reset inputs of said signal integrator means.
Claim 11
Dependent Claim
56 words
Apparatus as in claim 3 and further comprising means for generating another D.C. reference signal having an amplitude related to the nominal frequency of the alternating voltage signal and another signal comparator means for comparing the amplitude of the integrated signal from said second signal integrator means with the amplitude of the other D.C. reference signal.
Claim 12
Dependent Claim
58 words
Apparatus as in claim 5 and further comprising means for generating another D.C. reference signal having an amplitude related to the nominal frequency of the alternating voltage signal and a second signal comparator means for comparing the amplitude of the signal from the second signal sample and hold means with the amplitude of the other D.C. reference signal.
Claim 13
Dependent Claim
50 words
Apparatus as in claim 8 wherein said pulse signal generating means is a zero crossing detector circuit whose output is connected to both said sample and hold means, and a pulse delay means connecting the output of said zero crossing detector circuit to reset inputs of said signal integrator means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |