US3949271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient absorber circuit for regulated power supplies
Assignee: Forbro Design Corp
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Filing: 1974-09-24
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Granted: 1976-04-06
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Expires: 1994-09-24
Abstract
Abstract In a high current shunt stabilized regulated power supply transients may occur containing too much energy for the shunt stabilizer to safely absorb. The absorber circuit is designed with capacity to absorb normally encountered transients. If the transient lasts longer than a predetermined interval a crow-bar circuit is activated and the power supply is shut down.
Inventors
- 👤 Sarkis Nercessian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:52
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/613; H; H02; H02H; H02H9/00; H02H9/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
In a shunt stabilized regulated power supply, the combination of; a source of unregulated voltage including series connected inductance; a pair of load terminals for connecting a load in shunt with said source; programmable shunt stabilizing means connected in shunt with said load terminals for regulating the voltage across said load terminals or the current to said load terminals; spike energy absorbing means connected in shunt with said load terminals; means responsive to a transient energy spike across the output terminals for activating said absorbing means; crow-bar means connected across said load terminals; means for sensing unabsorbed spike energy existing after a predetermined period of time; and means responsive to sensed unabsorbed spike energy existing after said predetermined period of time for activating said crow-bar means.
Claim 2
Dependent Claim
126 words
In a shunt stabilized regulated power supply, the combination of; a source of unregulated voltage including series connected inductance; a pair of load terminals for connecting a load in shunt with said source; programmable shunt stabilizing means connected in shunt with said load terminals for regulating the voltage across said load terminals or the current to said load terminals; spike energy absorbing means connected in shunt with said load terminals; means responsive to a transient energy spike across the output terminals for activating said absorbing means; crow-bar means connected across said load terminals; means for sensing unabsorbed spike energy existing after a predetermined period of time; and means responsive to sensed unabsorbed spike energy existing after said predetermined period of time for activating said crow-bar means.
Claim 3
Dependent Claim
32 words
A shunt stabilized regulated power supply as set forth in claim 1; wherein said unabsorbed spike energy is sensed for a predetermined interval of time after the activating of said absorbing means.
Claim 4
Dependent Claim
25 words
A shunt stabilized regulated power supply as set forth in claim 2; wherein said predetermined period of time is of the order of 40 milliseconds.
Claim 5
Dependent Claim
38 words
A shunt stabilized regulated power supply as set forth in claim 3; wherein said predetermined period of time is of the order of 40 milliseconds; and said predetermined interval of time is of the order of 1 second.
Claim 6
Dependent Claim
27 words
A shunt stabilized regulated power supply as set forth in claim 1, and including; means for presetting the voltage level at which said absorbing means is activated.
Claim 7
Dependent Claim
27 words
A shunt stabilized regulated power supply as set forth in claim 2, and including; means for presetting the voltage level at which said crow-bar means is activated.
Claim 8
Dependent Claim
36 words
A shunt stabilized regulated power supply as set forth in claim 1, and including; means for establishing two independent voltage levels across the load terminals at which said absorbing means and said crow-bar respectively are activated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |