US3918043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply monitor
Assignee: Honeywell Inc
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Filing: 1974-03-18
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Granted: 1975-11-04
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Expires: 1994-03-18
Abstract
Abstract A power-down monitor circuit senses the imminent loss of a primary power supply output signal and produces a control signal in response thereto as an alarm signal for associated equipment supplied by the primary power supply. The monitor circuit uses a lower level of the primary power supply output signal to perform control operations before a total loss of primary power supply output signal is experienced. Restoration of the primary power supply output signal is monitored and data handling operations are delayed until a desired level of the output signal is reached to assure proper operation of the associated data handling equipment.
Inventors
- 👤 Francis J Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/24; H02H3/243; G; G01; G01R; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A power-down monitor circuit comprising: detection means for monitoring a primary power source output signal and for producing an output signal indicative of an imminent loss of the power source output signal, alarm means responsive to said output signal from said detection means for producing a control signal representative of an imminent loss of the primary power source output signal and energizing means for energizing said alarm means with a secondary power source output signal derived from said primary power source output signal and having a signal level below a signal level detected by said detection means to produce said first-mentioned output signal.
Claim 2
Dependent Claim
103 words
A power-down monitor circuit comprising: detection means for monitoring a primary power source output signal and for producing an output signal indicative of an imminent loss of the power source output signal, alarm means responsive to said output signal from said detection means for producing a control signal representative of an imminent loss of the primary power source output signal and energizing means for energizing said alarm means with a secondary power source output signal derived from said primary power source output signal and having a signal level below a signal level detected by said detection means to produce said first-mentioned output signal.
Claim 3
Dependent Claim
36 words
A power-down monitor circuit as set forth in claim 1 and including a second alarm means responsive to said detection means for producing a second alarm signal, said second means being energized by said energizing means.
Claim 4
Dependent Claim
42 words
A power-down monitor circuit as set forth in claim 1 wherein said alarm means responsive to said detection means includes relay means and relay driver means arranged to de-energize said relay upon the occurrence of said output signal from said detection means.
Claim 5
Dependent Claim
58 words
A power-down monitor circuit as set forth in claim 3 and including a relay lock-out circuit arranged to be energized by said energizing means and including means for preventing reenergization of said relay by said relay driver means following a loss of the primary power source output signal until a restoration of the energization by said energizing means.
Claim 6
Dependent Claim
76 words
A power-down monitor circuit as set forth in claim 3 and including a delay circuit for maintaining a power supply level signal derived from said primary power supply output signal to said relay driver means for a predetermined period of time following the production of an output signal by said detection means for preventing operation of said relay driver means for a predetermined period of time following a restoration of the primary power supply output signal.
References Cited (Backward Citations)
US3813667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |