US4245289A
Expired / Lapsed
US
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Power supply monitor
Assignee: Boeing North American Inc
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Filing: 1978-10-25
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Granted: 1981-01-13
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Expires: 1998-10-25
Abstract
Abstract In a duty cycle modulated power regulating apparatus, loss of regulation is anticipated by monitoring the duty cycle of the regulating means.
Inventors
- 👤 David W. Mineck
- 👤 Glen E. Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; H02M3/3378
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
Apparatus comprising (i) duty cycle modulated power regulating means for, in accordance with a duty cycle, alternately allowing, for a variable time T x , and inhibiting, for a variable time T y , contribution of an unregulated DC source to the regulating means output, said T x varying in response to variation in said unregulated DC source so that a substantially constant voltage-time area per (T x +T y ) interval is maintained at the regulating means output, and (ii) detection means for monitoring said duty cycle and providing a signal indicative of the value of said duty cycle.
Claim 2
Dependent Claim
100 words
Apparatus comprising (i) duty cycle modulated power regulating means for, in accordance with a duty cycle, alternately allowing, for a variable time T x , and inhibiting, for a variable time T y , contribution of an unregulated DC source to the regulating means output, said T x varying in response to variation in said unregulated DC source so that a substantially constant voltage-time area per (T x +T y ) interval is maintained at the regulating means output, and (ii) detection means for monitoring said duty cycle and providing a signal indicative of the value of said duty cycle.
Claim 3
Dependent Claim
48 words
Apparatus as defined in claim 1 wherein said signal indicative of the value of said duty cycle is a signal which changes from a first constant level to a second constant level upon the occurrence of said duty cycle exceeding a predetermined duty cycle value M 1 .
Claim 4
Dependent Claim
54 words
Apparatus as defined in claim 2 wherein said signal indicative of the value of said duty cycle is a signal which, after having changed to said second constant level, changes back to said first constant level upon the occurrence of said duty cycle dropping back below a predetermined duty cycle value M 2 .
Claim 5
Dependent Claim
16 words
Apparatus as defined in claim 3 wherein M 2 is not equal to M 1 .
Claim 6
Dependent Claim
15 words
Apparatus as defined in claim 4 wherein M 1 is greater than M 2 .
Claim 7
Dependent Claim
22 words
Apparatus as defined in claim 5 wherein said detection means is hysteretic, whereby, inequality between M 1 and M 2 is effected.
Claim 8
Dependent Claim
82 words
Apparatus as defined in claim 1 wherein each time interval (T x +T y ) equals T k , where T k is a predetermined constant time interval, and said detection means for monitoring said duty cycle and providing a signal indicative of the value of said duty cycle comprises means for monitoring a predetermined one of times T x or T y and providing a signal indicative of the duration of the monitored one of T x or T y .
Claim 9
Dependent Claim
80 words
Apparatus as defined in claim 7 wherein said signal indicative of the duration of the monitored one of T x or T y is a signal having a first constant level when the duration of the monitored one of T x or T y is less than a reference duration T f and having a second constant level when the duration of the monitored one of T x or T y is greater than said reference duration T f .
Claim 10
Dependent Claim
22 words
Apparatus as defined in claim 8 wherein said detection means includes hysteresis providing means for altering the reference duration T f .
Claim 11
Dependent Claim
33 words
Apparatus as defined in claim 7 wherein the predetermined one of times T x or T y is the one of T x or T y which is usually shorter than the other.
Claim 12
Dependent Claim
66 words
Apparatus as defined in claim 1 wherein each time interval (T x +T y ) equals T k , where T k isa predetermined constant time interval, and said detection means for monitoring said duty cycle and providing a signal indicative of the value of said duty cycle comprises means for monitoring T y and providing a signal indicative of the duration of T y .
Claim 13
Dependent Claim
43 words
Apparatus as defined in claim 11 wherein said signal indicative of the duration of T y is a signal which changes from a first constant level to a second constant level when T y becomes less than a reference duration T q .
Claim 14
Dependent Claim
63 words
Apparatus as defined in claim 11 wherein said signal indicative of the duration of T y is a signal which changes from a first constant level to a second constant level when T y becomes less than a reference duration T q and thereafter changes back to said first constant level when T y becomes greater than a reference duration T p .
Claim 15
Dependent Claim
16 words
Apparatus as defined in claim 13 wherein T p is not equal to T q .
Claim 16
Dependent Claim
15 words
Apparatus as defined in claim 14 wherein T p is greater than T q .
Claim 17
Dependent Claim
22 words
Apparatus as defined in claim 15 wherein said detection means is hysteretic, whereby, inequality between T p and T q is effected.
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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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |