US3764884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage to time conversion apparatus for an electrical converter
Assignee: Westinghouse Canada Inc
•
Filing: 1972-10-30
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Granted: 1973-10-09
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Expires: 1992-10-30
Abstract
Abstract This invention relates to a firing circuit control for prevention of premature firing of valves in a converter. The control circuit prohibits the firing of valves before a predetermined minimum firing angle.
Inventors
- 👤 J Reeve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:17
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/7575; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A converter circuit for producing a constant magnitude variable duration electrical pulse in response to the amplitude of an input signal comprising: first means for feeding an input signal into said converter circuit, second means for producing a unipolar signal of constant polarity and of magnitude depending on the absolute magnitude of said input signal, circuit means producing an output electrical pulse of constant magnitude and variable duration the duration of said pulse varying directly with the amplitude of said unipolar signal.
Claim 2
Dependent Claim
82 words
A converter circuit for producing a constant magnitude variable duration electrical pulse in response to the amplitude of an input signal comprising: first means for feeding an input signal into said converter circuit, second means for producing a unipolar signal of constant polarity and of magnitude depending on the absolute magnitude of said input signal, circuit means producing an output electrical pulse of constant magnitude and variable duration the duration of said pulse varying directly with the amplitude of said unipolar signal.
Claim 3
Dependent Claim
93 words
A control circuit for electrical apparatus comprising: sampling means for sampling a signal and producing a sample of said signal, said sample being fed into an amplifier, the output of which depends in polarity and magnitude upon the difference between said sample and a reference, polarity sensing means for producing a logical output signal which depends upon the polarity of said signal produced by said amplifier, variable length constant magnitude pulse producing means producing an output signal, the length of which corresponds to the absolute magnitude of the signal produced by said amplifier.
Claim 4
Dependent Claim
93 words
A control circuit for electrical apparatus comprising: sampling means for sampling a signal and producing a sample of said signal, said sample being fed into an amplifier, the output of which depends in polarity and magnitude upon the difference between said sample and a reference, polarity sensing means for producing a logical output signal which depends upon the polarity of said signal produced by said amplifier, variable length constant magnitude pulse producing means producing an output signal, the length of which corresponds to the absolute magnitude of the signal produced by said amplifier.
Claim 5
Dependent Claim
118 words
In a control circuit for an electrical apparatus; sampling means for sampling a signal corresponding to a basic function, reference means producing a reference signal, amplification means for combining and amplifying the difference of the signal corresponding to the basic function and the reference signal, polarity detection means for producing a logical output signal which is determined by the polarity of the output signal produced by said amplifier, comparison means for comparing the absolute magnitude of said output signal from said amplifier with a reference signal, variable pulse length producing means for producing an output pulse which is of substantially constant magnitude and variable in length depending upon the absolute magnitude of said signal produced by said amplifier.
Claim 6
Dependent Claim
118 words
In a control circuit for an electrical apparatus; sampling means for sampling a signal corresponding to a basic function, reference means producing a reference signal, amplification means for combining and amplifying the difference of the signal corresponding to the basic function and the reference signal, polarity detection means for producing a logical output signal which is determined by the polarity of the output signal produced by said amplifier, comparison means for comparing the absolute magnitude of said output signal from said amplifier with a reference signal, variable pulse length producing means for producing an output pulse which is of substantially constant magnitude and variable in length depending upon the absolute magnitude of said signal produced by said amplifier.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |