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Patent US3573554A successfully refreshed from Google Patents.
US3573554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple power supply overvoltage and interlock controlled cutoff
Assignee: United States Department of the Navy
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Filing: 1969-07-01
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Granted: 1971-04-06
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Expires: 1989-07-01
Abstract
Abstract In plural power circuits, all circuits are shut down in case of abnormal high or low voltage on any one of the several circuits. Over and under voltage sensors are connected across the circuits and through OR circuits to on-off switches in each power circuit.
Inventors
- 👤 Donald J Theobald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:28
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/20; H02H3/202
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
In combination in a multiple circuit power supply; a plurality of separate parallel power circuits; a plurality of transistor switches, the collector-emitter paths of said switches being connected, respectively; in series in said power circuits; a plurality of logical OR circuits, each OR circuit having a plurality of input terminals, and an output terminal, each output terminal being connected to the control electrode of one of said transistor switches so that each switch may respond to any one of a plurality of separate alarm signals; an overvoltage sensor connected between points of different potential in said power circuit for sensing an abnormal high voltage, said sensor being connected to one input of each of said OR circuits for disabling all power circuits in case of an overvoltage; and a series of undervoltage sensors connected, respectively, across said power circuits, and means for coupling the output of each sensor of said series to another of said inputs, of each of said OR circuits.
Claim 2
Dependent Claim
162 words
In combination in a multiple circuit power supply; a plurality of separate parallel power circuits; a plurality of transistor switches, the collector-emitter paths of said switches being connected, respectively; in series in said power circuits; a plurality of logical OR circuits, each OR circuit having a plurality of input terminals, and an output terminal, each output terminal being connected to the control electrode of one of said transistor switches so that each switch may respond to any one of a plurality of separate alarm signals; an overvoltage sensor connected between points of different potential in said power circuit for sensing an abnormal high voltage, said sensor being connected to one input of each of said OR circuits for disabling all power circuits in case of an overvoltage; and a series of undervoltage sensors connected, respectively, across said power circuits, and means for coupling the output of each sensor of said series to another of said inputs, of each of said OR circuits.
Claim 3
Dependent Claim
162 words
In combination in a multiple circuit power supply; a pair of separate parallel power circuits; a plurality of transistor switches, the collector-emitter paths of said switches being connected, respectively, in series in said power circuits; a plurality of logical OR circuits, each OR circuit having a plurality of input terminals, and an output terminal, each output terminal being connected to the control electrode of one of said transistor switches so that each switch may respond to any one of a plurality of separate alarm signals; an overvoltage sensor connected between points of different potential in said power circuits for sensing an abnormal high voltage, said sensor being connected to one input of each of said OR circuits for disabling all power circuits in case of an overvoltage; and an undervoltage sensor connected across each of said power circuits, and means for coupling the output of each sensor to another of said inputs of the OR circuit associated with the other power circuit.
Claim 4
Dependent Claim
162 words
In combination in a multiple circuit power supply; a pair of separate parallel power circuits; a plurality of transistor switches, the collector-emitter paths of said switches being connected, respectively, in series in said power circuits; a plurality of logical OR circuits, each OR circuit having a plurality of input terminals, and an output terminal, each output terminal being connected to the control electrode of one of said transistor switches so that each switch may respond to any one of a plurality of separate alarm signals; an overvoltage sensor connected between points of different potential in said power circuits for sensing an abnormal high voltage, said sensor being connected to one input of each of said OR circuits for disabling all power circuits in case of an overvoltage; and an undervoltage sensor connected across each of said power circuits, and means for coupling the output of each sensor to another of said inputs of the OR circuit associated with the other power circuit.
Claim 5
Dependent Claim
68 words
In the combination defined in claim 2; said overvoltage sensor comprising a diode connected between dissimilar voltage points in said power circuits; a plurality of resistors in series with said diode to generate on alarm voltage when said diode conducts; and means for coupling the voltage across said resistors to said one input of each OR gate to disable all series transistor switches in case of an overvoltage.
Claim 6
Dependent Claim
33 words
The combination defined in claim 2 further comprising a constant voltage source connected in series with said diode to accurately establish a thReshold voltage which said overvoltage must exceed to operate said diode.
Claim 7
Dependent Claim
82 words
In the combination defined in claim 2, two of said power circuits comprising busses of operating, respectively, above and below reference ground; said overvoltage sensor comprising a Zener diode with two resistors connected in series on either side of said diode and across said busses; a switch control means connected across the emitter-base of each of said transistor switches; one end of each of said resistors being connected to said switch control for disabling the associated transistor switches when said diode conducts.
References Cited (Backward Citations)
US3048718A
Cited
US3225257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |