US4075502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring device
Assignee: SASIB SpA Bologna
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Filing: 1976-11-26
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Granted: 1978-02-21
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Expires: 1996-11-26
Abstract
Abstract A monitoring device which is directed to achieving a more reliable power supply for an electronic or electromechanical system; such monitoring device including a means for selecting, in response to detection of subtle failures in either of two power supplies, so as to connect one and only one of the power supplies, regardless of internal failure within the monitoring device itself.
Inventors
- 👤 Everette D. Walley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:49
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A system for selecting one of a plurality of available electrical components in the event that another of the components is subject to failure in accordance with a plurality of functional criteria, comprising: an input and an output; selection means for selecting one of the components to be connected between said input and said output, including means for insuring that said selection means operates to select one and only one of said components, whereby failure of the selection means itself still results in one of the components being connected; a reference device for supplying an independent positive reference voltage; said selection means including a group of comparators for each component for comparing on a plurality of bases between each of said components and said reference device, each of said components and said reference device being connected to inputs of said respective groups of comparators; a bistable device having its inputs connected to the outputs of all of the individual comparators in said groups of comparators and its output connected to said reference voltage; and a relay connected to the output of said bistable device for connecting only one or the other of said components to said output.
Claim 2
Independent Claim
197 words
A system for selecting one of a plurality of available electrical components in the event that another of the components is subject to failure in accordance with a plurality of functional criteria, comprising: an input and an output; selection means for selecting one of the components to be connected between said input and said output, including means for insuring that said selection means operates to select one and only one of said components, whereby failure of the selection means itself still results in one of the components being connected; a reference device for supplying an independent positive reference voltage; said selection means including a group of comparators for each component for comparing on a plurality of bases between each of said components and said reference device, each of said components and said reference device being connected to inputs of said respective groups of comparators; a bistable device having its inputs connected to the outputs of all of the individual comparators in said groups of comparators and its output connected to said reference voltage; and a relay connected to the output of said bistable device for connecting only one or the other of said components to said output.
Claim 3
Dependent Claim
56 words
A system as defined in claim 1, in which said components are two power supplies arranged for connection between said input and output, and said selection means is a power supply monitor comprising a plurality of comparators for comparing between the voltage levels and AC content of each of said power supplies and a reference generator.
Claim 4
Dependent Claim
31 words
A system as defined in claim 2, in which each of said comparators comprises an operational amplifier having inputs connected to one of said power supplies and to said reference device.
Claim 5
Dependent Claim
21 words
A system as defined in claim 3, in which the outputs of said operational amplifier are connected to said bistable device.
References Cited (Backward Citations)
US3428820A
Cited
US3811050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |