Patent US3935479A successfully refreshed from Google Patents.
US3935479A
Expired / Lapsed
US
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Dynamic damping apparatus
Assignee: United States Department of the Air Force
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Filing: 1974-12-20
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Granted: 1976-01-27
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Expires: 1994-12-20
Abstract
Abstract A dynamic damping apparatus wherein the current source is critically damped during rise and fall of current but the DC flattop of the current is unaffected by the fluctuations of load voltage. Therefore the output impedance of the current source is low during rise and fall times, but high during the flattop. This increases current source regulation.STATEMENT OF GOVERNMENT INTEREST
Inventors
- 👤 John H. Andreasen
- 👤 James A. Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:34
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
165 words
Dynamic damping apparatus being comprised of a source of constant current pulses, a complex load having an input terminal and receiving said constant current pulses thereat, first, second, and third preselected resistors, each having a different predetermined resistive value, a first and second preselected capacitor, each having a different predetermined capacitive value, a transistor having an emitter, collector, and base, said emitter being connected directly to ground, said collecter being connected to said input terminal by way of said first resistor and to ground by way of said first capacitor, said base being connected to said input terminal by way of a series arrangement of said second capacitor and said second resistor, and also connected to ground by way of said third resistor, and a first diode connecting said base to ground, the current being damped during the rise and fall of the current with the current being unaffected by voltage variation of said complex load during the flattop portion of the constant current pulses.
Claim 2
Dependent Claim
165 words
Dynamic damping apparatus being comprised of a source of constant current pulses, a complex load having an input terminal and receiving said constant current pulses thereat, first, second, and third preselected resistors, each having a different predetermined resistive value, a first and second preselected capacitor, each having a different predetermined capacitive value, a transistor having an emitter, collector, and base, said emitter being connected directly to ground, said collecter being connected to said input terminal by way of said first resistor and to ground by way of said first capacitor, said base being connected to said input terminal by way of a series arrangement of said second capacitor and said second resistor, and also connected to ground by way of said third resistor, and a first diode connecting said base to ground, the current being damped during the rise and fall of the current with the current being unaffected by voltage variation of said complex load during the flattop portion of the constant current pulses.
Claim 3
Dependent Claim
22 words
Dynamic damping apparatus as described in claim 1 further including a second diode connected between said collector of said transistor and ground.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |