US3714546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage transformers
Assignee: Thorn Automation Ltd
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Filing: 1971-01-22
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Granted: 1973-01-30
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Expires: 1991-01-22
Abstract
Abstract A constant voltage regulators in which the output current is limited by a series impedance and the output voltage is shorted for the remainder of each half cycle by the operation of a solid state switching device whose operation is initiated when the time integral of the output voltage taken with zero initial conditions at the start of each half cycle reaches a predetermined magnitude.
Inventors
- 👤 R Tolworthy
- 👤 J Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A constant voltage regulator for a cyclic voltage supply comprising: input terminals; output terminals; a current-limiting impedance connected in series between an input terminal and an output terminal; a solid state latching switching device connected across the output terminals and initiable to short the output terminals together, said switching device being of the type which unlatches each time the short circuit current therethrough falls to substantially zero; re-settable integrating means for generating a signal dependent upon the time integral of the voltage across said output terminals; threshold-dependent initiating means for initiating said switching device each time the magnitude of said signal exceeds a predetermined value; and discharge path means, including actuable switching means, for re-setting said integrating means each time the voltage across said output terminals falls to substantially zero, said discharge path means, when said switching means is actuated, having an impedance which resets said integrating means to the same initial condition each time said integrating means is reset.
Claim 2
Dependent Claim
160 words
A constant voltage regulator for a cyclic voltage supply comprising: input terminals; output terminals; a current-limiting impedance connected in series between an input terminal and an output terminal; a solid state latching switching device connected across the output terminals and initiable to short the output terminals together, said switching device being of the type which unlatches each time the short circuit current therethrough falls to substantially zero; re-settable integrating means for generating a signal dependent upon the time integral of the voltage across said output terminals; threshold-dependent initiating means for initiating said switching device each time the magnitude of said signal exceeds a predetermined value; and discharge path means, including actuable switching means, for re-setting said integrating means each time the voltage across said output terminals falls to substantially zero, said discharge path means, when said switching means is actuated, having an impedance which resets said integrating means to the same initial condition each time said integrating means is reset.
Claim 3
Dependent Claim
160 words
A constant voltage regulator for a cyclic voltage supply comprising: input terminals; output terminals; a current-limiting impedance connected in series between an input terminal and an output terminal; a solid state latching switching device connected across the output terminals and initiable to short the output terminals together, said switching device being of the type which unlatches each time the short circuit current therethrough falls to substantially zero; re-settable integrating means for generating a signal dependent upon the time integral of the voltage across said output terminals; threshold-dependent initiating means for initiating said switching device each time the magnitude of said signal exceeds a predetermined value; and discharge path means, including actuable switching means, for re-setting said integrating means each time the voltage across said output terminals falls to substantially zero, said discharge path means, when said switching means is actuated, having an impedance which resets said integrating means to the same initial condition each time said integrating means is reset.
Claim 4
Dependent Claim
160 words
A constant voltage regulator for a cyclic voltage supply comprising: input terminals; output terminals; a current-limiting impedance connected in series between an input terminal and an output terminal; a solid state latching switching device connected across the output terminals and initiable to short the output terminals together, said switching device being of the type which unlatches each time the short circuit current therethrough falls to substantially zero; re-settable integrating means for generating a signal dependent upon the time integral of the voltage across said output terminals; threshold-dependent initiating means for initiating said switching device each time the magnitude of said signal exceeds a predetermined value; and discharge path means, including actuable switching means, for re-setting said integrating means each time the voltage across said output terminals falls to substantially zero, said discharge path means, when said switching means is actuated, having an impedance which resets said integrating means to the same initial condition each time said integrating means is reset.
Claim 5
Dependent Claim
16 words
A constant voltage regulator as claimed in claim 1 wherein said switching device comprises a triac.
Claim 6
Dependent Claim
19 words
A constant voltage regulator as claimed in claim 1 wherein said switching device comprises two controlled rectifiers connected anti-parallel.
Claim 7
Dependent Claim
36 words
A constant voltage regulator as claimed in claim 1 including full wave rectifying means connected across the output terminals, wherein the integrating means is so connected as to integrate the rectified output of said rectifying means.
References Cited (Backward Citations)
US3146392A
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US3211929A
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US3355650A
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US3435248A
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US3571696A
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US3576443A
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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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |