US3703717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage/frequency ratio monitor for a. c. signals
Assignee: AG Communication Systems Corp
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Filing: 1971-01-11
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Granted: 1972-11-21
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Expires: 1991-01-11
Abstract
Abstract A circuit for use with a signal generator to monitor the output signals, that provides an alarm indication if either voltage or frequency fall below or exceed predetermined limitations. Only signals within a permissible voltage/frequency ratio, regardless of limitations, are considered acceptable. Monitoring of voltage/frequency ratio, signal symmetry, and voltage amplitude are included.
Inventors
- 👤 Karl H Kuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:54
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A source of alternating current signals, alarm means, and connected therebetween a circuit for monitoring a plurality of variable characteristics of said alternating current signals, and in response to detection of signals that deviate from predetermined values, to operate said alarm means, said monitoring circuit comprising: a latch circuit; first detection means operated in response to the ratio of frequency to voltage of signals from said generator being in excess of a first predetermined value to trigger said latch circuit; and second detection means operated in response to the ratio of frequency to voltage of said alternating current signal from said generator being less than a second predetermined value to trigger said latch circuit; trigger of said latch circuit effective to operate said alarm means.
Claim 2
Dependent Claim
125 words
A source of alternating current signals, alarm means, and connected therebetween a circuit for monitoring a plurality of variable characteristics of said alternating current signals, and in response to detection of signals that deviate from predetermined values, to operate said alarm means, said monitoring circuit comprising: a latch circuit; first detection means operated in response to the ratio of frequency to voltage of signals from said generator being in excess of a first predetermined value to trigger said latch circuit; and second detection means operated in response to the ratio of frequency to voltage of said alternating current signal from said generator being less than a second predetermined value to trigger said latch circuit; trigger of said latch circuit effective to operate said alarm means.
Claim 3
Dependent Claim
125 words
A source of alternating current signals, alarm means, and connected therebetween a circuit for monitoring a plurality of variable characteristics of said alternating current signals, and in response to detection of signals that deviate from predetermined values, to operate said alarm means, said monitoring circuit comprising: a latch circuit; first detection means operated in response to the ratio of frequency to voltage of signals from said generator being in excess of a first predetermined value to trigger said latch circuit; and second detection means operated in response to the ratio of frequency to voltage of said alternating current signal from said generator being less than a second predetermined value to trigger said latch circuit; trigger of said latch circuit effective to operate said alarm means.
Claim 4
Dependent Claim
125 words
A source of alternating current signals, alarm means, and connected therebetween a circuit for monitoring a plurality of variable characteristics of said alternating current signals, and in response to detection of signals that deviate from predetermined values, to operate said alarm means, said monitoring circuit comprising: a latch circuit; first detection means operated in response to the ratio of frequency to voltage of signals from said generator being in excess of a first predetermined value to trigger said latch circuit; and second detection means operated in response to the ratio of frequency to voltage of said alternating current signal from said generator being less than a second predetermined value to trigger said latch circuit; trigger of said latch circuit effective to operate said alarm means.
Claim 5
Dependent Claim
73 words
A monitoring circuit as claimed in claim 1 wherein is further included: third detection means operated in response to the voltage amplitude of said alternating current signals from said generator being in excess of a third predetermined value to trigger said latch circuit; and fourth detection means operated in response to the voltage amplitude of said alternating current signals from said generator being below a fourth predetermined value to trigger said latch circuit.
Claim 6
Dependent Claim
50 words
A monitoring circuit as claimed in claim 1 wherein said first detection means include: a saturable core transformer, saturated in response to alternating current signals whose ratio of frequency to voltage is in excess of said first predetermined value to cause conduction of a triggering potential to said latch circuit.
Claim 7
Dependent Claim
56 words
A monitoring circuit as claimed in claim 1 wherein said second detection means include: a saturable core transformer, normally saturated and rendered unsaturated in response to alternating current signals from said generator being below said second predetermined limit, said unsaturated condition of said transformer effective to cause conduction of a triggering potential to said latch circuit.
Claim 8
Dependent Claim
48 words
A monitoring circuit as claimed in claim 2 wherein said third detection means include: a breakdown diode rendered conductive in response to signals from said alternating current generator being of a magnitude in excess of said third predetermined value, to extend a triggering potential to said latch circuit.
Claim 9
Dependent Claim
51 words
A monitoring circuit as claimed in claim 2 wherein said fourth detection means include: a normally conductive breakdown diode, rendered nonconductive in response to the magnitude of voltage of alternating current signals from said generator being below said fourth predetermined limit, whereby a triggering potential is diverted to said latch circuit.
Claim 10
Dependent Claim
56 words
A monitoring circuit as claimed in claim 1 wherein said latch circuit comprises: a silicon controlled rectifier operated in response to said operated first detection means, and operated in response to said operation of second detection means; and a relay operated in response to operation of said silicon controlled rectifier to render said alarm means operated.
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |